The pulsation is suppressed and the blood passes through without pulsating.
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The pulsation patterns also allow scientists to estimate the stars' ages.
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That pulsation rate, as well as their brightness, can determine their distance from Earth.
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At the very end, you see the pulsation becomes slower, from triples to duplets.
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Cepheids' pulsation rate and brightness are closely enough related that their distance can be calculated.
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I also like to take chaos and structure it so it has a kind of comprehensible pulsation.
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But nearly half of the time an audible pulsation in the ear can be linked to a vascular cause.
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The device lets users choose from ten pulsation patterns and runs on electricity via a seven foot power cord.
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Plus, the back boasts an anti-aging surface that can be used with its pulsation system on clean skin.
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Its six pleasure settings range from soft vibrations to intense pulsation to benefit both the TOR's wearer and their partners.
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Then, the pulsation begins from piano in the basses, but the violins, for example, and the winds, they are playing forte.
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Meditation also seems to intensify theta-wave activity, a type of rhythmic electrical pulsation often associated with a state of calm.
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I felt a pulsation inside my skull—it was like a tiny helicopter taking off and a shard of egg shell falling away.
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As if that wasn't enough, the back of the Luna 2 features an anti-aging surface meant to be used with its pulsation system.
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Researchers can measure the distance of a cepheid star with an accuracy of more than 95% by using the star's pulsation patterns to determine its luminosity.
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BRITE also detected two bright spots on another fast-rotating star, and found 19 different pulsation frequencies on a hot star, which sets a new record.
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And when it does, everything there out in the open, the last of the last pulsation, he himself gets up and goes, leaving behind him our redemption.
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Those who hear it have compared it to a fleet of diesel engines idling next to your home or the pulsation of a subwoofer at a concert.
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JUMP-STARTING HIS BRAIN, NOW HIS LIFE The treatment, called low-intensity focused ultrasound pulsation, was led by Martin Monti, a UCLA associate professor of psychology and neurosurgery.
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The pulsation seems to be related to the amount of light they receive, according tosome researchconducted on the green-banded broodsac (Leucochloridium paradoxum) a few years ago in Poland.
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The cyclical dimming and brightening of variable stars fascinated Henrietta Leavitt, who became the first person to realise that the frequency of their pulsation was directly related to their brightness.
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That means that if you know the pulsation period, you can infer the star's actual luminosity, then compare that with the luminosity observed from Earth in order to determine the distance.
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It's a common anomaly, but in a few individuals the constant pulsation of artery against nerve can, over time, cause an injury, resulting in a variety of painful conditions including Sunct.
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According to Arizona's new bill, the presence of a heartbeat, breathing, umbilical cord pulsation or "definite movement of voluntary muscles" constitutes "delivered alive" — but doctors are no longer permitted to make case-by-case decisions.
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They were able to determine the source of the pulsation because the star varied in observations based on fluctuations in brightness, the angle of the star and how it was oriented in its binary system.
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The recent bill changes that, however, and defines "delivered alive" to mean a multitude of signs that don't necessarily reveal if the baby would survive: a heartbeat, breath, umbilical cord pulsation, or any clear movement of voluntary muscles.
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The score's demands are precise technically and emotionally — its first page, for instance, asks for string harmonics "like an icy whisper, but with a pulsation" — and this recording is faithful to both claims, an entry into a world that's inviting, yet chilling.
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A team led by Julien Wit, a postdoc at MIT's Department of Earth, Atmospheric and Planetary Sciences, says the planet isn't heavy enough, or close enough, to cause such a dramatic stellar pulsation on its own, creating something of a cosmological mystery.
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The ophthalmologist-approved Iris Illuminating Eye Massager, for example, uses the same T-Sonic pulsation technology as the Luna cleaning devices to reduce crow's feet, dark circles, and under-eye bags, all while increasing your skin's absorptions of your regular eye cream or serum.
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"The patient's asleep on the table; I've got to get this watch," Dr. Ko, 42, recalled of a special-edition Vacheron Constantin Historiques Corne de Vache 1955 timepiece she coveted because it is called a doctor's watch, with a pulsation scale designed to measure heartbeats per minute.
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Even though it seems freaky to think about electricity going into your brain, it doesn't hurt to wear the devices, and it can "feel similar to a massage chair pulsation," according to Lauren Doyle Strauss, DO, assistant professor in the department of neurology at Wake Forest Baptist Medical Center.
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Most days, Sehgal's works made me feel like I was participating in a sort public, pre-linguistic dramaturgy, simultaneously comic and tragic, drifting in between halqai on the square, totally bewildered, yet somehow confident that what I was experiencing was a sense of spiritual and cultural pulsation in reciprocity with all of Jemaa el-Fna.
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The company had taken a famous Vacheron Constantin watch known as the Cornes de Vache (its lugs are shaped like cow horns), swapped out the platinum or the rose gold for humble steel, switched the white or silvered dial for a slate-gray one, and changed the tachymeter scale on the rim of the dial, which measures distance or speed, for a pulsation scale, which helps measure the beating of the human heart.
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She has a doctorate in Astrophysics from the University of Saint Andrews; her thesis was on the pulsation of Delta Scuti stars."The pulsation of Delta Scuti stars". St Andrews University Library.
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The pulsation period seems to vary in a timescale of weeks, which indicates the star is not a simple radial pulsator. The analysis of the temperature variations over the pulsation cycles also supports this conclusion. It is not clear if the pulsation period really is variable, or if the light curve is simply the sum of multiple stable pulsation frequencies. Stellar evolution models indicate that Rho Phoenicis has about 2.1 times the solar mass and an age of around 1 billion years.
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By the Cornelian law, pulsation as well as verberation is prohibited.
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V529 Andromedae was the first star known to combine Gamma Doradus and Delta Scuti type pulsations. Nine different pulsation frequencies have been observed, and three of them could arise from a previously unknown stellar pulsation mode.
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If the expansion occurs below a convective zone then no variation will be visible at the surface. If the expansion occurs too close to the surface the restoring force will be too weak to create a pulsation. The restoring force to create the contraction phase of a pulsation can be pressure if the pulsation occurs in a non-degenerate layer deep inside a star, and this is called an acoustic or pressure mode of pulsation, abbreviated to p-mode. In other cases, the restoring force is gravity and this is called a g-mode.
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For pulsation above frequency 100 Hz (i.e. for high speed pumps and all pipe systems shorter than say 80 yards): no moving parts devices. For pulsation frequencies below 100 Hz: certain moving parts devices of known membrane response characteristics.
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W Virginis is the prototype W Virginis variable, a subclass of the Cepheid variable stars. It is located in the constellation Virgo, and varies between magnitudes 9.46 and 10.75 over a period of approximately 17 days. There are variations in the light curve apparently due to multiple pulsation periods rather than inherent instabilities in the pulsation. The dominant pulsation mode has a period of 17.27134 days with a period decrease detected over a 75-year period.
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The hot gas temperatures in the pulsation reactor range from 250° - 1,350 °C (expansion to higher temperatures is in progress). However, the actual treatment temperature may differ significantly from these values after the reactant has been added. The necessary treatment temperature can be determined through systematic experiments with temperature variation. In addition to the treatment temperature and the type of hot gas atmosphere, pulsation reactors also provide the option of adjusting the frequency and amplitude of the pulsation (i.e.
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The X-ray luminosity is about 1 × 1029 erg/s and the emission varies with the pulsation period, suggesting a connection with the pulsation process. The peak X-ray emissions are in the 0.6–0.8 keV energy range, which occurs for plasmas with temperatures of 7–10 million K.
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Vacuum also helps keep the machine attached to the cow. The vacuum applied to the teat causes congestion of teat tissues (accumulation of blood and other fluids). Atmospheric air is admitted into the pulsation chamber about once per second (the pulsation rate) to allow the liner to collapse around the end of teat and relieve congestion in the teat tissue. The ratio of the time that the liner is open (milking phase) and closed (rest phase) is called the pulsation ratio.
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The variation shows a 2.4 day modulation which is caused by non-radial pulsation of the star itself. Other pulsation periods around 4.81 hours have also been identified. HD 64760 rotates rapidly. Despite its large size it completes a rotation every 4.1 days compared to every 27 days for the sun.
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The laser pulsates; the output power at the peaks can be orders of magnitude larger than that between pulses. After several strong peaks, the amplitude of pulsation reduces, and the system behaves as a linear oscillator with damping. Then the pulsation decays; this is the beginning of the continuous-wave operation.
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28 Andromedae A is a Delta Scuti variable, so it displays small luminosity variations at timescales less than a day due to star pulsation. There is evidence for two periodic cycles of 5,014 and 5,900 seconds, respectively. The amplitude variations, though, are not constant in time, and the pulsation modes are not radial.
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Bigot, L. & Dziembowski, W. Astronomy & Astrophysics, vol. 391, p. 235 (2002). In this model the axis of pulsation is aligned with the magnetic axis, which can lead to modulation of the amplitude of the pulsation, depending on the orientation of the axis to the line of sight, as it varies with rotation.
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Melodic movement tends to be gradually descending throughout the area and vocals include a moderate amount of tension and pulsation.
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The turbine often operated in the band II regime, which is accompanied by pulsation and strokes in the water flow.
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Atrial contraction against a closed tricuspid valve can cause pulsation in the neck and abdomen, headache, cough, and jaw pain.
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RR Lyrae shows just such a regular pattern of pulsation, which is causing its apparent magnitude to vary between 7.06–8.12 over a short cycle lasting 0.56686776 days (13 hours, 36 minutes). Each radial pulsation causes the radius of the star to vary between 5.1 and 5.6 times the Sun's radius. This star belongs to a subset of RR Lyrae-type variables that show a characteristic behavior called the Blazhko effect, named after Russian astronomer Sergey Blazhko. This effect is observed as a periodic modulation of a variable star's pulsation strength or phase; sometimes both.
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Other pulsation frequencies, combinations of these two, are also observed. The pulsations also cause the radial velocity of the star to vary by 38 km/s, with the same periods as the light variation. There is evidence that the pulsation periods change in a timescale of decades, with a possible cyclic variation period of 43 ± 10 years.
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Self-pulsation is a transient phenomenon in continuous-wave lasers. Self- pulsation takes place at the beginning of laser action. As the pump is switched on, the gain in the active medium rises and exceeds the steady-state value. The number of photons in the cavity increases, depleting the gain below the steady-state value, and so on.
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Hydropneumatic devices such as hydropneumatic accumulators or pulsation dampeners are devices which prevent, but do not absorb, alleviate, arrest, attenuate, or suppress a shock that already exists, meaning that these devices prevent the creation of a shock wave at an otherwise earlier stage. These can include pulsation dampeners, hydropneumatic accumulators, water hammer preventers, water hammer arrestors, and other things.
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However, later research suggested that what had been detected was not in fact the reflection of light from exoplanets, but star pulsation "visible beyond the cut-off frequency of the star." Further research indicated that star pulsation modes were indeed the more likely explanation for the signals found in 2011, and that the two exoplanets probably did not exist.
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Page 192. . Additionally, lack of pulsation distinguishes this lesion of the lower lip from a tortuous segment of the inferior labial artery.
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The pulsation periods of these oscillators lie between 5 and 21 minutes. The stars pulsate in high overtone, non-radial, pressure modes.
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The regular behavior of the Cepheids has been successfully modeled with numerical hydrodynamics since the 1960s, and from a theoretical point of view it is easily understood as due to the presence of center manifold which arises because of the weakly dissipative nature of the dynamical system. This, and the fact that the pulsations are weakly nonlinear, allows a description of the system in terms of amplitude equations and a construction of the bifurcation diagram (see also bifurcation theory) of the possible types of pulsation (or limit cycles), such fundamental mode pulsation, first or second overtone pulsation, or more complicated, double- mode pulsations in which several modes are excited with constant amplitudes. The boundaries of the instability strip where pulsation sets in during the star's evolution correspond to a Hopf bifurcation.
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Pulsation reactor technology is a thermal procedure for manufacturing fine powders with precisely defined properties. Pulsation reactor technology is a thermal procedure with a special functional principle that results in reaction parameters and a reaction medium, and which ultimately leads to other property parameters in terms of surface, reactivity, homogeneity and particle size of the powder material. The technology has proven particularly effective in the manufacture of ceramic and submicroscale powders, as well as in the production of highly active catalysts. Also, simple oxides such as zirconium oxide with doping elements or mixed oxides like spinel can be produced in the pulsation reactor.
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A prerequisite for irregular variability is that the star be able to change its amplitude on the time scale of a period. In other words, the coupling between pulsation and heat flow must be sufficiently large to allow such changes. This coupling is measured by the relative linear growth- or decay rate κ (kappa) of the amplitude of a given normal mode in one pulsation cycle (period). For the regular variables (Cepheids, RR Lyrae, etc.) numerical stellar modeling and linear stability analysis show that κ is at most of the order of a couple of percent for the relevant, excited pulsation modes.
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R Sagittae is classified as an RV Tauri variable because of the distinctive regular variations with alternating deep and shallow minima. The period is conventionally quoted as the time between two deep minima and is the fundamental pulsation mode. The shallow minimum is the result of a first overtone pulsation. It is further classified as RVb since the average and maximum magnitude varies slowly over several years.
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In physics, the Toda oscillator is a special kind of nonlinear oscillator. It represents a chain of particles with exponential potential interaction between neighbors. These concepts are named after Morikazu Toda. The Toda oscillator is used as a simple model to understand the phenomenon of self-pulsation, which is a quasi-periodic pulsation of the output intensity of a solid-state laser in the transient regime.
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Jain et al. (2012) examined existing data on the rate of pulsation of over a thousand cepheid variable stars in 25 galaxies. Theory suggests that the rate of cepheid pulsation in galaxies screened from a hypothetical fifth force by neighbouring clusters, would follow a different pattern from cepheids that are not screened. They were unable to find any variation from Einstein's theory of gravity.
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The pulsation between an inner and outer field, the circle and rectangular is mirrored by the rapid alternations between the two video sources, which maintains a rate of about sixty cycles per second. The switching occurs between two video sources, producing the two fields, background and circle. The two fields alternate between pure color and pure noise. The alternation creates a complex pulsation between circle and ground.
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The star is a pulsating white dwarf of type DAV, with an extremely stable period. Small variations in the phase of pulsation led to the suggestion that the star was being orbited by a giant planet which caused the pulsations to be delayed due to the varying distance to the star caused by the reflex motion about the system's centre-of-mass. Observations with the Spitzer Space Telescope failed to directly detect the planet, which put an upper limit on the mass of 5–6 Jupiter masses. Investigation of a separate pulsation mode revealed timing variations in antiphase with the variations in the originally- analysed pulsation mode.
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Certain species of Cassiopea have been observed to enter a sleep state - exhibiting decreased pulsation rate, reduced responsiveness to stimuli, and compensatory rebound sleep after deprivation.
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In the video, a circular form materializes on the screen and presents a division between inner and outer. A pulsation between the two is sustained throughout.
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The radius of the star varies by () over the course of a pulsation cycle. Compared to its neighbors, this star has a high peculiar velocity of .
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The pulsating flow of hot gas in the pulsation reactor enables very high heating rates and a significantly increased transfer of heat from the hot gas to the particle in the thermal process. This is beneficial for determining a specific particle size, surface condition and phase composition. The use of combustible reactants is not essential with the pulsation reactor. Both combustible and non-combustible reactants can be used in it.
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In contrast, the irregularity of the large amplitude Population II stars is more challenging to explain. The variation of the pulsation amplitude over one period implies large dissipation, and therefore there exists no center manifold. Various mechanisms have been proposed, but are found lacking. One, suggests the presence of several closely spaced pulsation frequencies that would beat against each other, but no such frequencies exist in the appropriate stellar models.
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First there is a two-photons absorption, followed by one non- radiative deexcitation and a fluorescence emission. The electron returns at ground state by another non-radiative deexcitation. The created pulsation \omega_2 is thus smaller that twice the excited pulsation \omega_1 TPA is a nonlinear optical process. In particular, the imaginary part of the third- order nonlinear susceptibility is related to the extent of TPA in a given molecule.
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269–280 and 1991,160-min pulsation of the sun – New observational results, Solar Physics (ISSN 0038-0938), vol. 133, May 1991, p. 95–102 the mainstream scientific establishment had moved on.
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The apparent link between the magnetic axis and the pulsation axis gives clues to the nature of the driving mechanism of the pulsations. As the roAp stars seem to occupy the main sequence end of the δ Scuti instability strip, it has been suggested that the driving mechanism may be similar, i.e. the opacity mechanism operating in the hydrogen ionization zone. No standard pulsation model can be made to excite oscillations of the roAp type using the opacity mechanism.
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The 'legendary guitarist,' Rocket then joined the band.dhakatribune.com/showtime/2019/01/27/kronedge-the-bangladeshi- band-abroad Khan's first appearance in music domain was from Spondon's musical program and performance at Bangladesh Television, in DIT Building in Dhaka about 3rd quarter of 1972 with rock singers like Nasir Ahmed Apu, Firoz Shai. Guitarist Mansur, Congo player Naseem of "স্পন্দন (Pulsation)". The program was directed by Mansur Ahmed Nipu of "স্পন্দন (Pulsation)" and produced by Noazesh Ali Khan of BTV.
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Sheridan, R.E., (1987). "Pulsation Tectonics As the Control of Long-Term Stratigraphic Cycles." Paleoceanography, 2: 97-118. Another theory, is that earth's true polar wander occurs over a long period of time.
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This allows extreme turndown (low-flow) without significant pulsation. Mechanical vapor recovery blowers -These specially designed centrifugal fans are designed to increase temperature and pressure of saturated steam in a closed-loop system.
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Pulsar planets are discovered through pulsar timing measurements, to detect anomalies in the pulsation period. Any bodies orbiting the pulsar will cause regular changes in its pulsation. Since pulsars normally rotate at near-constant speed, any changes can easily be detected with the help of precise timing measurements. The discovery of pulsar planets was unexpected; pulsars or neutron stars have previously gone supernova, and it was thought that any planets orbiting such stars would have been destroyed in the explosion.
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Percival Pott (1714–1788) by contrast would only operate if a fracture were present. Hill's understanding of concepts of cerebral compression is demonstrated further by his use of the word ‘compression’ and by his recording of cerebral pulsation or tension in all but one of the operations described. Both of his patients who exhibited poor or absent cerebral pulsation had sustained primary cerebral damage and both died. Hill more than any other eighteenth century writer appreciated the importance of cerebral pulsation as an indicator of cerebral health. Further evidence of his understanding of the need to decompress where possible is shown by his use of the technique of relieving pressure by shaving off cerebral hernias caused by raised intracranial pressure, a technique he learned from the writing of Henri Francois Le Dran (1685–1770).
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Cannon A waves may also be seen in ventricular tachycardia due to the inherent AV dissociation of the arrhythmia. This wave will cause pulsation in the neck and abdomen, headache, cough, and jaw pain.
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The human lymphatic system has no central pump. Instead, lymph circulates through peristalsis in the lymph capillaries, as well as valves in the capillaries, compression during contraction of adjacent skeletal muscle, and arterial pulsation.
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LipiView Ocular Surface uses Interferometry to measure the thickness of the tear film oily lipid layer. LipiFlow Thermal Pulsation System uses heat and pressure to unblock obstructed Meibomian glands to reduce dry eye symptoms.
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It also emerged that the improved plant was particularly suitable for manufacturing fine particles and catalytic powders. Today pulsation reactor technology has become established in chemical process engineering for manufacturing active particles with microstructural properties.
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According to the vital force theory, the conduction of water up the xylem vessel is a result of vital action of the living cells in the xylem tissue. These living cells are involved in ascent of sap. Relay pump theory and Pulsation theory support the active theory of ascent of sap. Emil Godlewski (senior) (1884) proposed Relay pump or Clamberinh force theory (through xylem parenchyma) and Jagadish Chandra Bose(1923) proposed pulsation theory (due to pulsatory activities of innermost cortical cells just outside endodermis).
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The outer envelope of this star is undergoing a type of pulsation that occurs in a class of variable stars known as semiregular variables and its brightness varies from magnitude +3.32 to +3.40. Based upon frequency analysis of the observed light curve, the star's variability exhibits multiple periods of pulsation. The detected periods are 13.0, 17.2, 25.6, 110.1 and 125.8 days. This is a high-velocity star with a peculiar velocity of more than relative to the mean motion of other stars in the vicinity.
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Mineral jigs or gravity concentrators were designed to allow for separation of materials with different densities. This process is accomplished by flowing a stream of liquid-suspended material over a screen and subjecting the screen to a vertical hydraulic pulsation. This pulsation momentarily expands or dilates the screen bed and allows the heavier materials to work toward the bottom. Heavier material, or concentrate, that is finer than the screen openings will gradually work through the beds and the retention screen into the hutch, or lower compartment.
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Lord Kelvin (1871) and Carl Anton Bjerknes (1871) assumed that all bodies pulsate in the aether. This was in analogy to the fact that, if the pulsation of two spheres in a fluid is in phase, they will attract each other; and if the pulsation of two spheres is not in phase, they will repel each other. This mechanism was also used for explaining the nature of electric charges. Among others, this hypothesis has also been examined by George Gabriel Stokes and Woldemar Voigt.
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For comparison with other type II Cepheids such as W Virginis variables, this formal period is twice the fundamental pulsation period. Therefore, although the approximate division between W Vir variables and RV Tau variables is at a fundamental pulsation period of 20 days, RV Tau variables are typically described with periods of 40–150 days. The pulsations cause the star to be hottest and smallest approximately halfway from the primary minimum towards a maximum. The coolest temperatures are reached near to a deep minimum.
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Seashore dedicated some of his musical focus on understanding the perception of vibrato, or the pulsation of pitch, in music and its effects on the richness and vibrance of tone. He spent considerable time to measure, record, and define the function of vibrato in music. He described vibrato as "a basic phenomenon of nature" to provide the tone with richness and emotion. Seashore proposed using devices and measuring instruments to record musical patterns and analyze the frequency, pulsation, and occurrence of vibrato in music.
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Thus a cycle of expansion and compression (swelling and shrinking) is maintained. The pulsation of cepheids is known to be driven by oscillations in the ionization of helium (from He++ to He+ and back to He++).
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The spectral type varies during the pulsation cycle from F8 to G0. Its mass has been measured at with reference to a close orbital companion, and it is over 3,000 times as luminous as the sun.
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Lincoln sign is the medical sign consisting of excessive popliteal artery pulsation due to hemodynamic effects of aortic regurgitation. This sign is associated with Marfan syndrome, in which aortic root dilation and aortic incompetence are common features.
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This process is repeated continuously and can be detected by the driver via brake pedal pulsation. Some anti-lock systems can apply or release braking pressure 15 times per second.Nice, Karim. How "Anti-Lock Brakes Work". howstuffworks.
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The nearest end of an object. Pulsation. A throb, as the throbbing of the heart. Pupiform. Like a pupa; one of the stages in the development of an insect. Pustulate. Covered with pustules or little pimples. Pustulose.
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Note the similarity with the observed light curve. From an analysis of the fixed points of the evolution operator a nice physical picture can be inferred, namely that the pulsations arise from the excitation of an unstable pulsation mode that couples nonlinearly to a second, stable pulsation mode which is in a 2:1 resonance with the first one, a scenario described by the Shilnikov theorem. This resonance mechanism is not limited to R Scuti, but has been found to hold for several other stars for which the observational data are sufficiently good.
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In psychological terms, Eros (properly, the life pulsation), the postulated sustaining and uniting principle of life, is thereby presumed to have a companion force, Thanatos (death pulsation), which seeks to terminate and disintegrate life. Both Freud and Klein regarded these "biomental" forces as the foundations of the psyche. These primary unconscious forces, whose mental matrix is the id, spark the ego—the experiencing self—into activity. Id, ego and superego, to be sure, were merely shorthand terms (similar to the instincts) referring to highly complex and mostly uncharted psychodynamic operations.
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Another important element of Trika theology is the active and dynamic nature of consciousness, which is described as the spontaneous vibration or pulsation (spanda) of universal consciousness, which is an expression of its freedom (svātāntrya) and power (Śakti).
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Santodita is described as universal bliss (cidānanda), undivided consciousness,, p. 261,263 kaula (the group of two as one)Kundalini, energy of the depths, Lilian Silburn, p. 187 and an "outflow of the pulsation of Shiva and Shakti"., p.
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However the lines do not change their shape or intensity, which would be expected from a pulsating star Non-radial pulsations have been proposed, with multiple pulsation periods of varying amplitude accounting for the apparently irregular brightness changes.
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Its class is SRb, and its pulsation cycle lasts 148 days. It has a radius of . S Scuti is also surrounded by a roughly spherical shell of dust. The shell was known earlier from its carbon dioxide emission lines.
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This sign is used to determine which waveform you are viewing. Feel the radial pulse while simultaneously watching the JVP. The waveform that is seen immediately after the arterial pulsation is felt is the 'v wave' of the JVP.
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362 (2001). which would account for the alignment of the pulsation axis with the magnetic axis. An instability strip for the roAp stars has been calculated,Cunha, M. S. Monthly Notices of the Royal Astronomical Society, vol. 333, p.
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In the Toda oscillator model of self-pulsation, the logarithm of amplitude varies exponentially with time (for large amplitudes), thus the amplitude varies as doubly exponential function of time.. Dendritic macromolecules have been observed to grow in a doubly-exponential fashion.
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This would not be the case if the variations were caused by an orbiting planet, and thus the timing variations must have a different cause. This illustrates the potential dangers of attempting to detect planets by white dwarf pulsation timing.
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This is an MS-type star on the asymptotic giant branch with a spectral type of M5-6Se. It is often classified simply as an M-type star, for example with the spectral type of . (The 'e' notation indicates the presence of emission lines in the spectrum.) It is a long period Mira variable with changing cycle lengths, showing a variation in its spectral features over the course of each cycle. Pulsation periods of 388, 398, and 382 days have been reported, as well as variations in the amplitude, which may indicate dual pulsation cycles that are interfering with each other.
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In 1911, American astronomer Keivin Burns discovered that the radial velocity of Gamma Pegasi varied slightly. This was confirmed in 1953 by American astronomer D. Harold McNamara, who identified it as a Beta Cephei variable. (At the time he actually identified it as a Beta Canis Majoris star, which was subsequently designated a Beta Cephei variable.) It has a radial pulsation period of 0.15175 days (3.642 hours), but also shows the behavior of a slowly pulsating B star (SPB) with three additional pulsational frequencies. Its magnitude varies between +2.78 and +2.89 over the course of each pulsation cycle.
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Without the other pulsation modes it would be considered a Classical Cepheid variable. Other pulsation modes have been detected at 89 to 234 days, with the strongest being a possible non-radial p-mode at 107 days and a possible non-radial g-mode at 185 days. The blue giant secondary has a similar mass and luminosity to the supergiant primary, but is visually much fainter. The primary is expected to have lost around since it was on the main sequence, and has expanded and cooled so it lies at the blue edge of the Cepheid instability strip.
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The correct period was found a few years later at 1.49078 days, at the time the shortest known period for a galactic Cepheid. Unusual periodic variations in the pulsation amplitude were also noticed, similar to the Blazhko effect in RR Lyrae variables.
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Becker's sign, or Becker's phenomenon, is the presence of visible (through an ophthalmoscope) pulsation of retinal arteries, found in patients with aortic insufficiency or Graves' disease.The Merck Manual OnlineBecker's phenomenon at Who Named It? The sign was named after Otto Heinrich Enoch Becker.
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Shortly afterwards it received its variable star designation of DL Crucis. A later detailed statistical analysis of the same data found periods of 3.650 and 3.906 days, as well as a first harmonic pulsation, with a maximum brightness range of 0.11 magnitudes.
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SigSpec is primarily used in asteroseismology to identify variable stars and to classify stellar pulsation (see references below). The fact that this method incorporates the properties of the time-domain sampling appropriately makes it a valuable tool for typical astronomical measurements containing data gaps.
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Müller's sign is the pulsation or bobbing of the uvula that occurs during systole. It can be seen in patients with severe aortic insufficiency. Müller's sign is caused by an increased stroke volume. Müller's sign is named for Friedrich von Müller, a German physician.
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Pulsation reactor technology came to the fore from the nineties through its use in environmental technology, particularly in sludge drying and the regeneration of resin-bonded foundry sands. From 2000 the pulsation reactor was used to produce catalytic powders on an industrial scale. The principle of pulsating combustion was developed over the years by the company IBU-tec advanced materials AG (which emerged from the SKET Institute and still exists today), which finally tested and commissioned another test facility in 2008. Thanks to the continuous optimisation of the reactors, it was now possible to use an oxidising, inert or reducing hot gas atmosphere to treat materials as required.
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Deneb is the prototype of the Alpha Cygni (α Cygni) variable stars, whose small irregular amplitudes and rapid pulsations can cause its magnitude to vary anywhere between 1.21 and 1.29. Its variability was discovered by Lee in 1910, but was not formally placed as a unique class of variable stars until the 1985 4th edition of the General Catalogue of Variable Stars. The cause of the pulsations of Alpha Cygni variable stars are not fully understood, but their irregular nature seems to be due to beating of multiple pulsation periods. Analysis of radial velocities determined 16 different harmonic pulsation modes with periods ranging between 6.9 to 100.8 days.
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A lightweight, heat-resistant engineering plastic was used for the intake manifold. The fuel delivery pipe assembly is a returnless type (to eliminate evaporative fuel emissions) and is made of SUS (steel use stainless) with a specially designed inner structure for the reduction of pulsation noise.
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Fraser Nunatak () is a nunatak rising to , south west of the Wilhoite Nunataks and west of the Churchill Mountains in Antarctica. It was named in honor of Graham Fraser, who has had some 45 years of Antarctic experience and led geomagnetic pulsation research over 11 seasons from 1989 onwards.
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The unusually short period of V473 Lyr is caused by pulsations in the second overtone and the fundamental pulsation period would be three times as long. The amplitude variations have an approximate period of 1,205 days, and there is a secondary modulation with a period of 5,300 days.
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More luminous Cepheids are cooler and larger and have longer periods. Along with the temperature changes their radii also change during each pulsation (e.g. by ~25% for the longer-period l Car), resulting in brightness variations up to two magnitudes. The brightness changes are more pronounced at shorter wavelengths.
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Male black field crickets produce mating calls using their forewings. Rubbing of wings produces pure tones, while rapid oscillations produce acoustic radiation. The greatest degree of sounds are generated upon wing closure. The general pattern of advertisement calls start with single chirp then move to pulsation with high repetition.
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MRI showing pulsation of CSF350x350px There is about 125–150 mL of CSF at any one time. This CSF circulates within the ventricular system of the brain. The ventricles are a series of cavities filled with CSF. The majority of CSF is produced from within the two lateral ventricles.
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Entitled Pulsation, the work was exhibited at 255 in New York.Rubin, Josh, Mark Dean Veca. Retrieved on 2008-02-14. Veca’s most recent solo exhibition, Imbroglio (October 20 – November 17, 2007), was held at the Jonathan LeVine Gallery and was his most ambitious New York exhibition thus far.
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Free jazz retains pulsation and sometimes swings but without regular meter. Frequent accelerando and ritardando give an impression of rhythm that moves like a wave. Previous jazz forms used harmonic structures, usually cycles of diatonic chords. When improvisation occurred, it was founded on the notes in the chords.
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This variation has a cyclic pattern formed from multiple overlapping frequencies, with the dominant frequencies being 3.257 and 3.282 cycles per day. As such, it belongs to a class called slowly pulsating B-type (SPB) stars. Be stars that show these types of pulsation have been dubbed SPBe stars.
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RS Puppis, one of the brightest known Cepheid variable stars in the Milky Way galaxy (Hubble Space Telescope) A Cepheid variable () is a type of star that pulsates radially, varying in both diameter and temperature and producing changes in brightness with a well-defined stable period and amplitude. A strong direct relationship between a Cepheid variable's luminosity and pulsation period established Cepheids as important indicators of cosmic benchmarks for scaling galactic and extragalactic distances. This robust characteristic of classical Cepheids was discovered in 1908 by Henrietta Swan Leavitt after studying thousands of variable stars in the Magellanic Clouds. This discovery allows one to know the true luminosity of a Cepheid by simply observing its pulsation period.
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It is a suspected variable star with a brightness that ranges from magnitude +4.77 to +4.86. This variation has pulsation periods of 23.4, 24.3, 27.9, and 34.1 days. The effective temperature of the stellar atmosphere is around 3,800 K, and it shines with 1,734 times the luminosity of the Sun.
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The radial artery runs along the lateral aspect of the volar forearm deep to the superficial fascia. The artery runs between the styloid process of the radius and the flexor carpi radialis tendon. The point of maximum pulsation of the radial artery can usually be palpated just proximal to the wrist.
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In less than 1% of the population, the radial artery takes a superficial course in the anatomical snuff box. This arterial variation can be mistaken for the cephalic vein as accidental injection of this variant radial artery has been reported. Identifying arterial pulsation in the anatomical snuff box is therefore recommended.
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Therefore, it is difficult to state whether scroll compressors have lower pulsation levels than reciprocating compressors as has often been claimed by some suppliers of scroll compressors. The more steady flow yields lower gas pulsations, lower sound and lower vibration of attached piping, while having no influence on the compressor operating efficiency.
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44 So from the point of view of this school, the phenomenal world (Śakti) is real, and it exists and has its being in Consciousness (Cit).Ksemaraja, trans. by Jaidev Singh, Spanda Karikas: The Divine Creative Pulsation, Delhi: Motilal Banarsidass, p.119 Thus, Kashmir Shaivism is also propounding of theistic monism or panentheism.
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This is the second slow movement. The cello line is once again modal. It is accompanied by calm, liquid pulsation from the percussions and "mirror" chords played by the harp as well as phrases in backwards motion by the violins. Towards the end, the 12-note motif that opened the work reappears.
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If the base of a surface convection zone is sharp and the convective timescales slower than the pulsation timescales, the convective flows react too slowly perturbations that can build up into large, coherent pulsations. This mechanism is known as convective blocking and is believed to drive pulsations in the \gamma Doradus variables.
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1975) and subsequently by the COS-B satellite. The SAS-2 group reported a pulsation in the gamma-ray signal, with period approximately 59 s, although the limited number of detected gamma-rays (121 over a period of four months) led them to conclude that the pulsation was not statistically compelling. Due to the limited angular resolution of the instrument (approximately 2.5° at 100MeV) and the small number of gamma-rays detected, the exact location of the source was uncertain, constrained only to be within a relatively large "error region". At the time of detection, four weak radio sources were known within this region, two supernova remnants bordered it and a known satellite galaxy to the Milky Way lay nearby.
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W Cygni is a red giant on the asymptotic giant branch (AGB). Its spectral type ranges between M4e and M6e, and it shows possible elevated levels of Technetium. The masses of AGB stars are poorly known, but using the pulsation properties of W Cygni, it mass is calculated to be slightly less than the sun's.
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Abt and Morrell (1995) found a stellar classification of F0 IV for this star, suggesting it is an F-type subgiant. In their 2010 study, Fox Machado et al. assigned a class of F2 III, which matches an evolved giant star. It is a Delta Scuti variable with at least three overlapping pulsation frequencies.
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Based on the input of the ECU, coils operate the inlet and outlet valves. During pressure release the brake fluid is stored in accumulators. In this open system approach the fluid is then brought back in the brake circuit via a pump operated by a motor which is felt through pulsation on the brake lever.
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44 Kashmir Shavisim sees the phenomenal world (Śakti) as real: it exists, and has its being in Consciousness (Chit).Ksemaraja, trans. by Jaidev Singh, Spanda Karikas: The Divine Creative Pulsation, Delhi: Motilal Banarsidass, p. 119 Kashmir Shaivism was influenced by, and took over doctrines from, several orthodox and heterodox Indian religious and philosophical traditions.
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W Aquilae is a variable whose brightness oscillates between magnitude +7.3 and +14.3 over a period of 490.43 days. In Mira variables (which are named after Mira, the prototype), this instability comes from pulsation in the stellar surface, causing changes in color and brightness. W Aquilae, a Mira variable, shows silicon monoxide maser emission.
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The star appears to be a Beta Cephei variable with a pulsation period of 0.0919 days and an amplitude of 0.0080 in magnitude. The magnitude 5.39 secondary, component B, is classified as a Gamma Cassiopeiae type variable star. Due to its variable nature, the brightness of the system varies from magnitude +4.42 to +4.82.
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Finally, Brown introduced the powerful idea that pathology (unhealthy function) was simply physiology (healthy function) extended beyond a certain range of sustainable variability or pulsation (a function of the polarities that constitute life). Röschlaub worked initially with Fichtean insights and then Schelling and his Naturphilosophie, establishing a dynamic philosophical basis in natural science for medicine.
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The equipment intended for direct measurement of the explosion-generated underwater bubble was not operational at the time of the shot, but based on other measurements, the bubble's maximum radius was calculated as , and its pulsation period approximately 2.83 seconds. (See Scientific Director's Report) See also the table at List of United States' nuclear weapons tests.
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The detected pulsation modes correspond to those for both and β Cephei variables and slowly pulsating B stars. Similar pulsations have not been detected in component Ab, but it is possible that it is also a variable star. Aa is 12.02 ± 0.13 times as massive as the Sun, while Ab is 10.58 ± 0.18 times as massive.
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Bonenfant, Y., Towards a politics of felt pulsation: De-disciplining voice and movement in the making of a musi-dance performance. Studies in Theatre and Performance, Vol. 28, No. 1, 2007, pp39-58.Abdul-Rahim, R., An exploration of the place and function of voice in the drama therapeutic process. Montreal, Quebec, Canada: Concordia University, 2006.
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114–115 The characteristics of this entire area include short iterative phrases; reverting relationships; shouts before, during, and after singing anhemitonic pentatonic scales; simple rhythms and meter and, according to Nettl, antiphonal or responsorial techniques including "rudimentary imitative polyphony". Melodic movement tends to be gradually descending throughout the area and vocals include a moderate amount of tension and pulsation.
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The projected rotational velocity of the star is 341 km/s. Psi2 Aquarii is 4.6 times as large as the Sun with an effective temperature of 15,212 K in its outer envelope. It is a λ Eridani variable, or periodic Be star, with a pulsation cycle lasting 1.073 days. The amplitude of the variation is 0.024 in magnitude.
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The interferometry- measured angular diameter of this star is , which, at its estimated distance, equates to a physical radius of about 137 times the radius of the Sun. It is classified as a semi-regular variable star and its brightness varies by an amplitude of 0.0636 in magnitude. The identified pulsation periods are 32.3, 38.5, and 44.9 days.
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V428 Andromedae is the variable star designation for HD 3346. It is a short-period semi-regular variable (type SRS), also called an ultra- small-amplitude pulsating red giant. It has an amplitude of only 0.065 magnitudes. The main pulsation period is 11.5 days, but other periods of 11, 15, and 22 days have been detected.
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He died in Paris in 1837. > Nothing is permanent but change, nothing constant but death. Every pulsation > of the heart inflicts a wound, and life would be an endless bleeding were it > not for Poetry. She secures to us what Nature would deny – a golden age > without rust, a spring which never fades, cloudless prosperity and eternal > youth.
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At the same time its temperature varies between 5,180 and 6,029 K. The radius and temperature do not vary in sync, with the smallest size occurring as the temperature is approaching its maximum. The brightness increases rapidly to a maximum when the star is hottest, then decreases more slowly. This is one of the properties that indicate fundamental mode pulsation.
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Blending the sound of the accordion and strings with consistent high-energy pulsation and repetitions, this piece is written in a ¾ waltz tempo, which is typical of the music for the dance-hall or cabaret. It also employs traditional harmonies and melodies. It reflects the composer's musical heritage, as well as on the Italo-Slovene weddings and banquets of his childhood.
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When the neutron star passes nearby or through the Be circumstellar disk, it will capture material and temporarily become an X-ray pulsar. The circumstellar disk around the Be star expands and contracts for unknown reasons, so these are transient X-ray pulsars that are observed only intermittently, often with months to years between episodes of observable X-ray pulsation.
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The veins of the neck, viewed from in front. The patient is positioned at a 45° incline, and the filling level of the external jugular vein determined. The internal jugular vein is visualised when looking for the pulsation. In healthy people, the filling level of the jugular vein should be less than 4 centimetres vertical height above the sternal angle.
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As the magnetic field appears to be important, research has taken this into account in deriving non-standard pulsation models. It has been suggested that the modes are driven by the suppression of convection by the strong magnetic field near the magnetic poles of these stars,Balmforth, N. et al. Monthly Notices of the Royal Astronomical Society, vol. 323, p.
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If the faulty nail are taken out at once the horse will have few symptoms of pain (whether or not there is blood from the hole). The hoof will turn warm and by feeling the arteries to the hoof an increased pulsation can be felt. When the hoof is inspected the horse can feel pain when pressure is applied to the damaged area.
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While long term irregular behavior in the temporal variations of the pulsation amplitudes is possible when amplitude equations apply, this is not the general situation. Indeed, for the majority of the observations and modeling, the pulsations of these stars occur with constant Fourier amplitudes, leading to regular pulsations that can be periodic or multi-periodic (quasi-periodic in the mathematical literature).
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Vibration in automobiles may occur for many reasons, such as wheel unbalance, imperfect tire or wheel shape, brake pulsation, and worn or loose driveline, suspension, or steering components. Foreign material, such as road tar, stones, ice, or snow, that is stuck in a tire's tread or otherwise adhered to the tire or wheel may also cause a temporary unbalance and subsequent vibration.
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Standard seamless high pressure aluminium cylinders do not have a limited life.They may be used until they fail test or inspection. Three cylinders from each batch are pulsation hydrostatically tested for 10,000 cycles from 0 to test pressure at 12 cycles per minute. An alternative test approved by the US Department of Transport is 100,000 cycles from 0 to working pressure.
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A period of 58 days has been reported in UV, while the dominant period for longer wavelengths is 118.5 days. The short wavelength variations are thought to be caused by the disc around the hot secondary, while pulsation of the red supergiant primary caused the other variations. It has been predicted that the disc surrounding the secondary would produce such brightness variability.
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The fluid end produces the pumping process with valves, pistons, and liners. Because these components are high-wear items, modern pumps are designed to allow quick replacement of these parts. To reduce severe vibration caused by the pumping process, these pumps incorporate both a suction and discharge pulsation dampener. These are connected to the inlet and outlet of the fluid end.
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The primary component is an evolved red giant star with a stellar classification of M3 IIICa-1. It is an irregular variable with seven measured pulsation periods ranging from 22.4 to 162.6 days, and amplitudes ranging up to 0.m022. The star is a bright X-ray source with a luminosity of . There is a magnitude 8.3 companion at an angular separation of 0.04 arcseconds.
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The heart may continue to race for minutes or hours, but the eventual termination of the arrhythmia is as rapid as its onset. During AVNRT the heart rate is typically between 140 and 280 beats per minute. Close inspection of the neck may reveal pulsation of the jugular vein in the form of "cannon A-waves" as the right atrium contracts against a closed tricuspid valve.
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Tau Pegasi belongs to spectral class A5 Vp, making it an A-type main-sequence star. This is a Delta Scuti variable star with a pulsation period of 0.94 hours. It is rotating rapidly with a projected rotational velocity of 150 km s−1. Tau Pegasi is radiating nearly 30 times the luminosity of the Sun from its outer atmosphere at an effective temperature of 7,762 K.
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The radius determined from the observed brightness and colour of the star is . 15 Arietis is a short period semiregular variable with the designation AV Arietis. The period given in the General Catalogue of Variable Stars is 5.032 days. Longterm photometry finds that the strongest pulsation period is 18.1 days with an amplitude of 0.028 magnitudes, while a second is 21.9 days and 0.030 in magnitude.
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The even temperature distribution in the reactor well and the narrow residence time distribution prevents the formation of hard aggregates whilst allowing the homogenous treatment of material. The temperature range covered by the pulsation reactor is considerably higher than in spray dryers, for example, so that gentle drying is only possible to a certain extent but a combination of drying and calcination is feasible.
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As soon as the air-fuel mixture changes back to stoichiometry, because of the reduction in injector pulsation, the ECM will adjust the current respectively. The end result is no current (0.00 amperes) at 14.7:1 air-fuel ratio. In this case a light negative hump is seen on the ammeter with the reading returning to 0.00 almost immediately. The fuel correction happens very quickly.
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The Broadbent inverted sign is a clinical sign in which pulsation is seen on the postero-lateral wall of the left side of the chest in time with cardiac systole. This was originally thought to be due to an aneurysm of the left atrium, but is now known to be more commonly associated with left ventricular hypertrophy.Barry G. Firkin, Judith A. Whitworth. Dictionary of Medical Eponyms.
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Lambda Aquarii is a red giant star with a stellar classification of M2.5 III. It is classified as slow irregular variable and pulsation periods of 24.5, 32.0, and 49.5 days have been identified. This star is on the asymptotic giant branch and is generating energy through the nuclear fusion of hydrogen and helium along concentric shells surrounding an inert core of carbon and oxygen.
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Two air chambers have been included to eliminate water pulsation caused by the action of the pistons. At the rear of the appliance are a water reservoir and a coal box situated to the right and left of the pump respectively. Connected to the front wheel axle is a large coal box. The vehicle weighs , the bulk of the weight being supported by the rear axle.
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In human reproduction, a live birth occurs when a fetus, whatever its gestational age, exits the maternal body and subsequently shows any sign of life, such as voluntary movement, heartbeat, or pulsation of the umbilical cord, for however brief a time and regardless of whether the umbilical cord or placenta are intact.World Health Organization. International statistical classification of diseases and related health problems. Tenth Revision.
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This implies that from the point of view of Kashmir Shavisim, the phenomenal world (Śakti) is real, and it exists and has its being in Consciousness (Chit).Ksemaraja, trans. by Jaidev Singh, Spanda Karikas: The Divine Creative Pulsation, Delhi: Motilal Banarsidass, p.119 Whereas, Advaita holds that Brahman is the reality (pure consciousness) and it is inactive (niṣkriya) and the phenomenal world is an appearance (māyā).
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Intra-oral examination should include observations for asymmetry, discolouration, pulsation and obstructions in the duct orifices. Swelling of the deep lobe of the parotid gland may be seen intra-orally, and may also displace the tonsil. The minor salivary glands should be examined. The labial, buccal and posterior palatal mucosa should be dried with an air blower or tissue and pressed to assess the flow of saliva.
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Its changes in brightness are complex with at least two different periods showing. The General Catalogue of Variable Stars lists a period of 110 days. More recent studies show a primary pulsation period of 133 days, with and a long secondary period with an amplitude of 0.2 magnitudes and duration 1,300 days. The long secondary period variations are possibly caused by long-lived convection cells.
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The drop in brightness is less pronounced at longer wavelengths, and the overall luminosity of the star is thought to be largely unchanged. The variations are caused by condensation of dust which temporarily obscures the star. Short wavelengths of light are absorbed and re-emitted as infra-red. Many R CrB variables show small amplitude pulsations and W Mensae has a pulsation period of approximately 67 days.
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These correspond to the first overtone and fundamental radial pulsation modes for an extreme helium star slightly under . At irregular intervals a few years or decades apart R Coronae Borealis fades from its normal brightness near 6th magnitude for a period of months or sometimes years. There is no fixed minimum, but the star can become fainter than 15th magnitude in the visual range.
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By pulsing the core it is possible to obtain a propellant hotter than the fuel. However, and in clear contrast with classical nuclear thermal rockets (including liquid and gas nuclear rockets), the thermal energy from the decay of fission daughters is unwanted. Very high instantaneous propellant temperatures are hypothetically attainable by pulsing the solid nuclear core, only limited by the rapid radiative cooling after pulsation.
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Human heart anatomy diagram. Retrieved on 2010-07-02. The right atrium and right ventricle are often referred to as the right heart; similarly, the left atrium and left ventricle are often referred to as the left heart. The atria do not have valves at their inlets, and as a result, a venous pulsation is normal and can be detected in the jugular vein as the jugular venous pressure.
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An SX Phoenicis variable is a type of variable star. These stars exhibit a short period pulsation behavior that varies on time scales of 0.03–0.08 days (0.7–1.9 hours). They have spectral classifications in the range A2-F5 and vary in magnitude by up to 0.7. Compared to the Sun, these stars have a lower metallicity, which means they have a reduced abundance of elements other than hydrogen and helium.
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And when it > does, everything there out in the open, the last of the last pulsation, he > himself gets up and goes, leaving behind him our redemption. With a jaunty > wave, he is suddenly gone, and though he takes all his fire off with him > like no less a force than Prometheus, our own lives now seem > inextinguishable. Nobody is dying, nobody--not if Bronfman has anything to > say about it.
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When it reached the temples, the pulsation of the arteries increased in those areas. The brain was affected to some length but nonetheless, the patient was able to reason and cohere to his ideas. One time the mechanic experienced furious paroxysm at his own house where he warned his wife to flee to avoid death. He also experienced the same periodical fury at the asylum where he plotted against the governor.
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It is a Delta Scuti type variable star, with a dominant pulsation period of 0.1881 days and an amplitude of 0.016 in magnitude. David and Hillenbrand (2015) found an average mass for this star of 1.61 times the mass of the Sun, whereas Zorec and Royer (2012) list a much higher mass estimate of . It is about 356 million years old with a projected rotational velocity of 222 km/s.
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The spectrum of this star matches a stellar classification of F0 III, with the luminosity class of III indicating this is most likely an evolved giant star. The variability of this star was discovered by Michel Breger in 1969. It was revealed to be a Delta Scuti-type pulsating variable star with at least two periods of pulsation. The known periods have frequencies of 6.68 and 7.12 cycles per day.
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However, the distance to 119 Tauri is still only known approximately from its Hipparcos parallax. Gaia Data Release 2 gives a distinctly larger parallax, but with even greater uncertainty and flagged as unreliable. 119 Tauri is a pulsating star although the pulsation has not been clearly detected in direct angular measurements. Observations of TiO lines in its spectrum as its brightness changes show effective temperature changes up to .
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In 1999 they performed in a new show called Suisa VeYatspan, second pulsation (סוויסה ויצפאן, פעימה שנייה). A year later he appeared in the children's musical The Siam king (based on the book Anna and the King of Siam), and in 2004 he played in the children's musical Aladdin. In 2007, Yatzpan played in the children's musical based on Jules Verne's book Around the World in Eighty Days.
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As they had done with previous single "Breathe", Erasure provided downloadable software on the compact disc single which allowed buyers to create their own remix of the track. The double A-sided single peaked at number twenty-five on the UK Singles Chart, becoming Erasure's thirty-first UK Top 40 single. A cover version of the song was recorded by Australian artist Peter Wilson (singer) for his album Pulsation in 2013.
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Merieme Chadid promotes education by giving lectures, attending conferences, supervising students, and her documentary on astronomy, Tarik Annujah, has played on the Al Jazeera Children's Channel. Her most published research aims to understand and decipher early star formation and the stellar evolution and pulsation towards of understanding of the Universe. She was listed by Forbes Magazine as one of the thirty most interesting and fascinating workers in the world.
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It is thought that the pulsations are of highest amplitude high in the atmospheres of these stars, where the density is lower. As a result, the spectral lines that are formed by elements that are radiatively levitated high in the atmosphere are likely to be most sensitive to measuring the pulsation, whereas the lines of elements such as iron, which gravitationally settle, are not expected to exhibit radial velocity variations.
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The reported IMR provides one statistic which reflects the standard of living in each nation. Changes in the infant mortality rate reflect social and technical capacities of a nation's population. The World Health Organization (WHO) defines a live birth as any infant born demonstrating independent signs of life, including breathing, heartbeat, umbilical cord pulsation or definite movement of voluntary muscles.. WHO. 2011 This definition is used in Austria, for example.
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Its light curve has a dominant period of 215.2 seconds, which is estimated to increase by approximately one second each 14 million years.From Ṗ=2.3·10−15 in Kepler et al. G117-B15A has been claimed to be the most stable optical clock ever found, much more stable than the ticks of an atomic clock. It is also the first pulsating white dwarf to have its main pulsation mode index identified.
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The transient regime can be important for the quasi-continuous lasers that needs to operate in the pulsed regime, for example, to avoid the overheating. The only numerical solutions were believed to exist for the strong pulsation, spiking. The strong spiking is possible, when U/V \ll 1, i.e., the lifetime of excitations in the active medium is large compared to the lifetime of photons inside the cavity.
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The same year he returned to the U.S. and joined the University of Cincinnati as a lecturer. By 1924 he was a professor of geology at the institution. His early works were on paleontology, and he performed studies of stromatolettia, oolites, and ripple-shaped markings. Later he concentrated on the Earth's crust diastrophism problem and proposed firstly (immediate and independent with Mikhail Tetyaev) the pulsation hypothesis of the Earth developing.
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Both brothers invented a process to manufacture transparent paper looking like vellum, reproducing the technique of the English, followed by the papermakers Johannot and Réveillon.Our History 1777 Canson, n.d., 2 July 2017 In 1796, Joseph Michel Montgolfier invented the first self-acting hydraulic ram, a water pump to raise water for his paper mill at Voiron. In 1772, the British clockmaker John Whitehurst had invented its precursor, the "pulsation engine".
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AC Andromedae (AC And) is a variable star in the constellation Andromeda. Its maximum apparent visual magnitude is 10.77, but can be seen fainter down to a magnitude of 11.9. The nature of AC Andromedae is still not determined. Its light curve shows clearly three radial pulsation modes, the fundamental one with a period of 0.71 days, and the first two overtones of 0.525 and 0.421 days, respectively.
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Between a quarter and a half of long period variables show very slow variations with an amplitude up to one magnitude at visual wavelengths, and a period around ten times the primary pulsation period. These are called long secondary periods. The causes of the long secondary periods are unknown. Binary interactions, dust formation, rotation, or non-radial oscillations have all been proposed as causes, but all have problems explaining the observations.
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The accepted explanation for the pulsation of Cepheids is called the Eddington valve, or "κ-mechanism", where the Greek letter κ (kappa) is the usual symbol for the gas opacity. Helium is the gas thought to be most active in the process. Doubly ionized helium (helium whose atoms are missing both electrons) is more opaque than singly ionized helium. The more helium is heated, the more ionized it becomes.
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The conclusion that the exterior field must also be stationary is more surprising, and has an interesting consequence. Suppose we have a spherically symmetric star of fixed mass which is experiencing spherical pulsations. Then Birkhoff's theorem says that the exterior geometry must be Schwarzschild; the only effect of the pulsation is to change the location of the stellar surface. This means that a spherically pulsating star cannot emit gravitational waves.
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The primary component of the pair, κ Sco A, is a variable star of Beta Cephei type. It is undergoing radial pulsations with a dominant frequency of 4.99922 cycles per day, or 4.8 hours per cycle. There are overlapping secondary pulsation frequencies of about 4.85 and 5.69 cycles per day. This star has about 17 times the mass of the Sun and is nearly 7 times the Sun's radius.
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This object is an aging red giant star on the asymptotic giant branch with a stellar classification of M4IIIa. Its variable nature was discovered by American astronomer J. Ashbrook in 1948. This is a suspected slow irregular variable of sub-type Lb that varies in visual magnitude from 4.80 down to 4.96. Long-term photometry measurements suggest there are at least four pulsation periods ranging from 27.1 to 39.0 days.
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Overall, the visual apparent magnitude of the star varies between 6.76 and 7.53. SX Phoenicis is an A-type main-sequence star with a stellar classification of A2 V. During the 1940s it was classed as a "probable subdwarf" because of its low luminosity for the spectral class. On average, it has a luminosity of 5.89 times the Sun's luminosity and an effective temperature of 7,700 K. During the primary pulsation cycle, the temperature varies between 7,230 K at minimum brightness up to 8,170 K at maximum brightness; when the two pulsation cycles are appropriately phased, the temperature can reach 8,400 K. Similarly, the pulsations cause the radius of the star to change, which is evidenced by changes in the surface gravity. Stellar evolution models by Petersen and Christensen-Dalsgaard (1996), taking into account the pulsating behavior of the star, indicate that the properties of the star are consistent with a mass of 1.0 solar mass and an age of 4 billion years.
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It has around 18 times the mass of the Sun and 12 times the Sun's radius. This star is radiating about times the luminosity of the Sun from its outer envelope at an effective temperature of . This is a variable star of the Beta Cephei type, causing the apparent magnitude to vary between +2.86 and +2.94 with multiple periods of , , and 8.2 days. During each pulsation cycle, the temperature of the star varies by .
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Medical signs that can be detected from observation of eye fundus (generally by funduscopy) include hemorrhages, exudates, cotton wool spots, blood vessel abnormalities (tortuosity, pulsation and new vessels) and pigmentation.Imran Akram, Adrian Rubinstein "Common retinal signs. An overview", "Optometry Today", 28/01/05, Arteriolar constriction, seen as "silver wiring", and vascular tortuosities are seen in hypertensive retinopathy. The eye's fundus is the only part of the human body where the microcirculation can be observed directly.
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In the seventeenth incantation, dealing with the "snake-pulsation-of-the abodomen," the affliction is described as the son of Ix Hun Tipplah Can ("Lady Unique Pulsating Sky"). There are a few references to Christianity in the text. Almost every incantation ends with "Amen," and the thirty-ninth uses "Jesus Mary" (Jesuz Maria) as an exclamation. Ritual of the Bacabs is filled with symbolism that has long since lost its significance and meaning.
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The spectral classification varies between F7Ib and G3Ib over the course of a pulsation cycle. Likewise the effective temperature of the outer envelope varies between 5,780 K and 5,260 K, while the radius varies from 61 to 69 times the Sun's radius. On average, it is radiating about 2,900 times the luminosity of the Sun. Membership of a cluster provides independent validation of distances determined using recent Hubble Space Telescope and Hipparcos parallaxes.
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The 'e' suffix is used to mark the presence of emission lines, which indicates this is a Be star surrounded by a circumstellar disk of hot gas that was formed from material ejected from the star. Mu Centauri is a pulsating variable star that has multiple non-radial cycles with a primary period of 0.503 days. Three other pulsation cycles have a similar period, while two have a shorter interval of about 0.28 days.
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These are named after the prototypical star for such variables: Delta Scuti. Delta Scuti variables typically range from spectral class A2 to F8, and a stellar luminosity class of III (giants) to V (main sequence stars). They are short-period variables that have a regular pulsation rate between 0.025 and 0.25 days. Delta Scuti stars have an abundance of elements similar to the Sun's (see Population I stars) and between 1.5 and .
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With Walter Page's bass replacing the tuba in Bennie Moten's Kansas City Orchestra, the way was laid clear for the band to develop the kinetic style of swing it would show under the leadership of Count Basie. The banjo, with its loud and raucous tone, was replaced with the guitar, which provided a more subtle and secure pulsation (chunk-chunk) in the foundation rhythm. As the saying went, the guitar was more felt than heard.
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A subtype of Darrieus turbine with straight, as opposed to curved, blades. The cycloturbine variety has variable pitch to reduce the torque pulsation and is self-starting. The advantages of variable pitch are: high starting torque; a wide, relatively flat torque curve; a higher coefficient of performance; more efficient operation in turbulent winds; and a lower blade speed ratio which lowers blade bending stresses. Straight, V, or curved blades may be used.
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Pulsation models indicate that the stellar rotation axis is inclined by 50–70° in relation to the line of sight. This star is classified as an F-type giant with a spectral type of F0/2III. It appears to be expanding after depleting all the nuclear hydrogen and leaving the main sequence. BB Phoenicis has an estimated mass of 2.25 times the solar mass and a radius of 4.7 times the solar radius.
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Jimmy Crawford was born in 1910 in Memphis, Tennessee. He was the drummer of the Jimmie Lunceford big band for nearly 14 years from 1928 to 1942. According to Modern Drummer, Crawford "played with a strong, solid pulsation — a classic trademark of the Lunceford sound — and was a key factor in establishing the unique Lunceford beat."Jimmy Crawford , Modern Drummer Later, in the 1950s, Crawford worked as a pit drummer on Broadway.
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The spiking is possible at low dumping of self-pulsation, in the corresponding both parameters u and ~v^{}~ should be small. The intent of realization of the oscillator Toda at the optical bench is shown in Fig.4. The colored curves are oscillograms of two shouts of the quasi-continuous diode-pumped microchip solid-state laser on Yb:YAG ceramics, described by. The thick black curve represents the approximation within the simple model with oscillator Toda.
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Cepheid variables are one of the most important classes of pulsating star. They are core-helium burning stars with masses above about 5 solar masses. They principally oscillate at their fundamental modes, with typical periods ranging from days to months. Their pulsation periods are closely related to their luminosities, so it is possible to determine the distance to a Cepheid by measuring its oscillation period, computing its luminosity, and comparing this to its observed brightness.
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Hence the helium contracts and heats up again and the cyclical process continues. Throughout their lifetime Delta Scuti stars exhibit pulsation when they are situated on the classical Cepheid instability strip. They then move across from the main sequence into the giant branch. The prototype of these sorts of variable stars is Delta Scuti (δ Sct), which exhibits brightness fluctuations from +4.60 to +4.79 in apparent magnitude with a period of 4.65 hours.
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It is a semiregular variable star of subtype SRb, ranging in magnitude from 4.28 down to 4.36. The star has pulsation periods of 18.8 and 45.5 days, each with an amplitude of 0.019 in magnitude. With the hydrogen at its core exhausted, the star has expanded to around 69 times the Sun's radius and it is radiating 1,021 times the luminosity of the Sun from its swollen photosphere at an effective temperature of 3,915 K.
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This component is a Beta Cephei variable star with three dominant pulsation modes having frequencies of around six per day. It has a stellar classification of B2 IV, matching a B-type subgiant star with 9.5 times the mass of the Sun and 5.6 times the Sun's radius. The unseen secondary is an F-type star of class F6–7. The tertiary component is a magnitude 11.4 star with a class of F0.
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More than a hundred of Segerstam's symphonies have been performed. Many of his compositions are influenced by nature, and he is often praised for his contributions to Nordic Music. He developed a personal approach to aleatory composition through a style called "free pulsation" in which musical events interact flexibly in time, with his composition method persistent throughout his œuvre. His fifth string quartet, the 'Lemming' (1970), ushered in his new chapter of post-Expressionistic writing of the 1960s.
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The semiregular variable stars fall on one of five main period-luminosity relationship sequences identified, differing from the Mira variables only in pulsating in an overtone mode. The closely related OSARG (OGLE small amplitude red giant) variables pulsate in an unknown mode. Many semiregular variables show long secondary periods around ten times the main pulsation period, with amplitudes of a few tenths of a magnitude at visual wavelengths. The cause of the pulsations is not known.
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It is close to the open cluster Trumpler 15, but is not thought to be a member. It appears to be surrounded by a dusty nebula, possibly material ejected from the star itself. It is catalogued as an irregular variable star, but a number of possible pulsation periods have been detected. Analysis from observations over 40 years give variations with periods of 201 and 448 days, with other studies suggesting periods of 100 and 1,400 days.
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At this distance, the brightness of the star is diminished from extinction caused by interstellar gas and dust. The spectrum of 27 Aquilae fits a stellar classification of B9 III, with the luminosity class of III typically indicating this is an evolved giant star. As it lies within the field of view of the CoRoT satellite, close observation have been made of its luminosity. The star shows a multiperiodic variability with at least six pulsation frequencies discovered.
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The inflated atmosphere becomes less ionized and loses energy, causing it to cool and shrink back down again. The result of this cycle is a periodic pulsation of the atmosphere and a matching variation of the luminosity. The relative dimensions of IK Pegasi A (left), B (lower center) and the Sun (right).For an explanation of the star colors, see: Stars within the portion of the instability strip that crosses the main sequence are called Delta Scuti variables.
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The pulsation rate of IK Pegasi A has been measured at 22.9 cycles per day, or once every 0.044 days. Astronomers define the metallicity of a star as the abundance of chemical elements that have a higher atomic number than helium. This is measured by a spectroscopic analysis of the atmosphere, followed by a comparison with the results expected from computed stellar models. In the case of IK Pegasus A, the estimated metal abundance is [M/H] = +0.07 ± 0.20.
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Kepler-70c (formerly called KOI-55.02; sometimes listed as KOI-55 c) is one of two postulated exoplanets orbiting the sdB star Kepler-70. Their discovery was announced in 2011. However, later research suggests that the two exoplanets probably do not exist, and that "pulsation modes visible beyond the cut-off frequency of the star" were a more likely explanation for the signals believed to indicate exoplanets. This is not proven with certainty one way or the other.
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This is an aging red giant star on the asymptotic giant branch with a stellar classification of M3 III. It is a semiregular variable with an amplitude of 0.14 in the B-band and pulsation periods of 22.9 and 24.0 days. Having exhausted the hydrogen at its core, the star has expanded to 86 times the Sun's radius. It is radiating 1,202 times the Sun's luminosity from its swollen photosphere at an effective temperature of 3,535 K.
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Uneven pad transfer can lead to thickness variation of the disc. When the thicker section of the disc passes between the pads, the pads will move apart and the brake pedal will raise slightly; this is pedal pulsation. The thickness variation can be felt by the driver when it is approximately or greater (on automobile discs). Thickness variation has many causes, but there are three primary mechanisms which contribute to the propagation of disc thickness variations.
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In this picture, the boundaries of the instability strip where pulsation sets in during the star's evolution correspond to a Hopf bifurcation. The existence of a center manifold eliminates the possibility of chaotic (i.e. irregular) pulsations on the time scale of the period. Although resonant amplitude equations are sufficiently complex to also allow for chaotic solutions, this is a very different chaos because it is in the temporal variation of the amplitudes and occurs on a long time scale.
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A model of a power unit, comprising turbine and generator, of the Sayano- Shushenskaya plant Turbines of the type used in this power plant have a very narrow working band at high efficiency regimes. If this band is exceeded the turbines begin to vibrate, caused by the pulsation of water flow and water strokes. These vibrations and shocks cause the turbines to degrade over time. Turbine 2 had experienced problems for a long time prior to the 2009 accident.
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The increase in moving parts and crankshaft load is one drawback. Car washes often use these triplex- style plunger pumps (perhaps without pulsation dampers). In 1968, William Bruggeman reduced the size of the triplex pump and increased the lifespan so that car washes could use equipment with smaller footprints. Durable high- pressure seals, low-pressure seals and oil seals, hardened crankshafts, hardened connecting rods, thick ceramic plungers and heavier duty ball and roller bearings improve reliability in triplex pumps.
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The positive pulsation of the femoral artery signifies that the heart is beating and also blood is flowing to the lower extremity. It is also necessary to appreciate clinically that this is a case where the nerve is more lateral than the vein. In most other cases the nerve (relative to its associated artery and vein) would be the deepest or more medial followed by the artery and then the vein. But in this case it is the opposite.
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CC Andromedae (CC And) is a variable star in the constellation Andromeda. It is a pulsating star of the Delta Scuti type, with an apparent visual magnitude that varies between 9.19 and 9.46 with a periodicity of 3 hours. The stellar classification of CC Andromedae is F3IV-V, as it shows intermediate characteristics between a subgiant and a main sequence star. The brightness variations are the result of 7 different pulsation modes, most of which are non-radial.
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For practical application, a safety factor of about 5 is recommended: : P = 0.07\, V L/t + P_1, where P1 is the inlet pressure in psi, V is the flow velocity in ft/s, t is the valve closing time in seconds, and L is the upstream pipe length in feet."Water Hammer & Pulsation". Hence, we can say that the magnitude of the water hammer largely depends upon the time of closure, elastic components of pipe & fluid properties.
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The point of maximum brightness occurs when the star is smallest and hottest. Their variation in brightness is much greater—up to 1 magnitude—in ultraviolet wavelengths. A small number of stars have been identified with periods shorter than one hour, corresponding to 1/4 of the fundamental radial pulsation period and 3/8 of the fundamental period. They also have relatively low amplitudes and a very narrow range of spectral types B2-3 IV-V.
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Cardarelli's sign is an abnormal pulsation of the trachea that may be found in patients with a dilation or aneurysm of the aortic arch.Cardarelli, A: Movimento medico-chirurgico, volume 11, Napoli, 1878. Cardarelli's sign can be felt by a physician pressing on the thyroid cartilage and displacing it to the patient's left. This increases contact between the left bronchus and the aorta, allowing systolic pulsations from the aorta to be felt at the surface if an aneurysm is present.
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An intra-aortic balloon pump The intra-aortic balloon pump (IABP) is a mechanical device that increases myocardial oxygen perfusion and indirectly increases cardiac output through afterload reduction. It consists of a cylindrical polyurethane balloon that sits in the aorta, approximately from the left subclavian artery. The balloon inflates and deflates via counter pulsation, meaning it actively deflates in systole and inflates in diastole. Systolic deflation decreases afterload through a vacuum effect and indirectly increases forward flow from the heart.
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For smaller rotor sizes the inherent leakage in the rotors becomes much more significant, leading to this type of mechanism being unsuitable for small air compressors. The gas compression process of a rotary screw is a continuous sweeping motion, so there is very little pulsation or surging of flow, as occurs with piston compressors. This also allows screw compressors to be significantly quieter and produce much less vibration than piston compressors, even at large sizes, and produces some benefits in efficiency.
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Pimenta's Point is an anatomical landmark for easy location of the posterior tibial artery or tibialis posterior artery (a peripheral pulse on the inside of your ankle). An imagined line is drawn between the bony prominence of the medial malleolus and the insertion of the achilles tendon. At the exact midpoint of this line place three fingers parallel to the leg and you will either feel the posterior tibial pulsation (normal) or will not (peripheral vascular disease or calcification, anatomical variant).
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The sound changes as the pulse length changes. The noise is produced by the switching frequency current ripple and the resulting torque pulsation experienced by the rotor of the induction machine. More modern AC traction, such as on 1995 stock, uses an IGBT (which is essentially a combination of the MOSFET and BJT), which can operate at much higher switching frequencies than the GTO. The whining sound is far less noticeable because of the higher switching frequency of IGBT drives.
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It is a semi-regular variable of subtype SRb with measured pulsation periods of 27.7, 143.3 and 208.3 days, and an average visual magnitude of 6.30. With the supply of hydrogen at its core exhausted, it has cooled and expanded off the main sequence and now has around 60 times the girth of the Sun. On average, the star is radiating about 497 times the luminosity of the Sun from its swollen photosphere at an effective temperature of 3,507 K.
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Its small amplitude, period, chemical peculiarity, and position in the H–R diagram indicated that it may be an α2 CVn variable and it was given this classification in the General Catalogue of Variable Stars, along with the variable star designation V1286 Aquilae. Later studies showed that the period was spurious and several very short pulsation periods were found: 11.6, 12.0, and 13.4 minutes. This indicated that 10 Aql was a member of the new rapidly oscillating Ap star class.
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It is made up of a claw, four teatcups, (Shells and rubber liners) long milk tube, long pulsation tube, and a pulsator. The claw is an assembly that connects the short pulse tubes and short milk tubes from the teatcups to the long pulse tube and long milk tube. (Cluster assembly) Claws are commonly made of stainless steel or plastic or both. Teatcups are composed of a rigid outer shell (stainless steel or plastic) that holds a soft inner liner or inflation.
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The two rigid stainless steel teatcup shells applied to the front two quarters of the udder are visible. The top of the flexible liner is visible at the top of the shells as are the short milk tubes and short pulsation tubes extending from the bottom of the shells to the claw. The bottom of the claw is transparent to allow observation of milk flow. When milking is completed the vacuum to the milking unit is shut off and the teatcups are removed.
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Edwin Powell Hubble (November 20, 1889 – September 28, 1953) was an American astronomer. He played a crucial role in establishing the fields of extragalactic astronomy and observational cosmology. Hubble proved that many objects previously thought to be clouds of dust and gas and classified as "nebulae" were actually galaxies beyond the Milky Way. He used the strong direct relationship between a classical Cepheid variable's luminosity and pulsation period (discovered in 1908 by Henrietta Swan Leavitt) for scaling galactic and extragalactic distances.
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Betelgeuse is listed in the General Catalogue of Variable Stars with a possible period of 2,335 days. More detailed analyses have shown a main period near 400 days, a short period of 185 days, and a longer secondary period around 2,100 days. The lowest reliably-recorded V-band magnitude of +1.614 was reported in February 2020. Radial pulsations of red supergiants are well-modelled and show that periods of a few hundred days are typically due to fundamental and first overtone pulsation.
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Period-Luminosity relation for Classical Cepheid variables In astronomy, a period-luminosity relation is a relationship linking the luminosity of pulsating variable stars with their pulsation period. The best- known relation is the direct proportionality law holding for Classical Cepheid variables, sometimes called Leavitt's law. Discovered in 1908 by Henrietta Swan Leavitt, the relation established Cepheids as foundational indicators of cosmic benchmarks for scaling galactic and extragalactic distances. The physical model explaining the Leavitt's law for classical cepheids is called kappa mechanism.
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He also discovered the heart valves. The Greek physician Galen (2nd century CE) knew blood vessels carried blood and identified venous (dark red) and arterial (brighter and thinner) blood, each with distinct and separate functions. Galen, noting the heart as the hottest organ in the body, concluded that it provided heat to the body. The heart did not pump blood around, the heart's motion sucked blood in during diastole and the blood moved by the pulsation of the arteries themselves.
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It oscillates with multiple, non-radial pulsation cycles and a dominant cycle of 6.8 minutes. The spectrum shows peculiar features caused by chemical stratification of the outer atmosphere. It displays a moderate deficiency of carbon, nitrogen and oxygen, while there is an overabundance of chromium (Cr). The stellar classification of A7 Vp SrCrEu indicates that this is a main sequence star with enhanced levels of strontium (Sr), chromium, and europium (Eu) in its atmosphere (compared to a typical star like the Sun).
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The legal definition of persons may include or exclude children depending on the context. In the US, regarding liability, children or minors are not legally persons because they do not satisfy the requirements for personhood under the law. However, regarding protection under the law, the US Born-Alive Infants Protection Act of 2002 provides a legal structure that those born at any gestational stage that are either breathing, have heartbeat, umbilical cord pulsation, or any voluntary muscle movement are living, individual human persons.
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V810 Centauri is a double star consisting of a yellow supergiant primary (V810 Cen A) and blue giant secondary (V810 Cen B). It is a small amplitude variable star, entirely due to the supergiant primary which is visually over three magnitudes brighter than the secondary. It is the MK spectral standard for class G0 0-Ia. V810 Cen A shows semi-regular variations with several component periods. The dominant mode is around 156 days and corresponds to Cepheid fundamental mode radial pulsation.
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They are pulsating due to the entire star expanding and contracting. This produces a change in temperature along with radius, both of which factors cause the variation in luminosity. The pulsation depends on the mass and radius of the star and there is a well- defined relationship between period and luminosity (and colour). The very large visual amplitudes are not due to large luminosity changes, but due to a shifting of energy output between infra-red and visual wavelengths as the stars change temperature during their pulsations.
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The pulsating stars swell and shrink, affecting their brightness and spectrum. Pulsations are generally split into: radial, where the entire star expands and shrinks as a whole; and non-radial, where one part of the star expands while another part shrinks. Depending on the type of pulsation and its location within the star, there is a natural or fundamental frequency which determines the period of the star. Stars may also pulsate in a harmonic or overtone which is a higher frequency, corresponding to a shorter period.
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Photometric observations dating back to 1946 provide a lengthy record of its pattern of pulsation; it undergoes periodic pulsations with a single period of 0.14088143(3) days, or 7.1 cycles per day. During each cycle, the star's magnitude varies with an amplitude of 0.15 and the radial velocity varies by 10 km s−1. The peak brightness occurs 28.8 minutes following the minimum radial velocity. The outer atmosphere's effective temperature of 6,920 K is one of the lowest known for a Delta Scuti variable.
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The wide operating range coupled with the inherent fast acting operation of the AFR sensor, puts the system always at stoichiometry, which reduces a great deal of emissions. With this type of fuel control, the air/fuel ratio is always hovering close to 14.7:1. If the mixture goes slightly rich the ECM adjusts the pump circuit's current to maintain the set operating voltage. The current is detected by the ECM's detection circuit, with the result of a command for a reduction in injector pulsation being issued.
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For resonant modes the appropriate amplitude equations have additional terms that describe the resonant coupling among the modes. The Hertzsprung progression in the light curve morphology of classical (singly periodic) Cepheids is the result of a well-known 2:1 resonance among the fundamental pulsation mode and the second overtone mode. The amplitude equation can be further extended to nonradial stellar pulsations. In the overall analysis of pulsating stars, the amplitude equations allow the bifurcation diagram between possible pulsational states to be mapped out.
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The majority of the material is asymmetrical, based on the principle of 'free declamation', that is to say: the melodic curve and length of two consecutive sentences usually vary. Frequently Vermeulen spins long melismas into ever continuous melodies, in which every memory of period structure is absent. Particularly striking is the free rhythm of flowing lines, which have become disengaged from a fixed classification of metre by antimetric figures and ties. Yet elsewhere we come across short and pithy melodies, with a clear pulsation.
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In absence of external interventions, the umbilical cord occludes physiologically shortly after birth, explained both by a swelling and collapse of Wharton's jelly in response to a reduction in temperature and by vasoconstriction of the blood vessels by smooth muscle contraction. In effect, a natural clamp is created, halting the flow of blood. In air at 18 °C, this physiological clamping will take three minutes or less. In water birth, where the water temperature is close to body temperature, normal pulsation can be 5 minutes and longer.
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Overlying arterial structures may cause compression of the upper part of the left common iliac vein. Compression of the left common iliac vein against the fifth lumbar vertebral body by the right common iliac artery as the artery crosses in front of it traditionally happens in May–Thurner syndrome. Continuous pulsation of the common iliac artery may trigger an inflammatory response within the common iliac vein. The resulting intraluminal elastin and collagen deposition can cause intimal fibrosis and the formation of venous spurs and webs.
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The light curve of this magnitude change follows a regular saw-tooth pattern. During each radial pulsation cycle, the radius of the star varies by ±3.9 times the Sun's radius around a mean of 67.8. Its spectral type and luminosity class are likewise variable, from F-type to G-type and from a supergiant to a bright giant. Far ultraviolet emissions have been detected from this star with the Far Ultraviolet Spectroscopic Explorer, while X-ray emissions were detected with the XMM-Newton space telescope.
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Classical Cepheids are 4–20 times more massive than the Sun and up to 100,000 times more luminous. These Cepheids are yellow bright giants and supergiants of spectral class F6 – K2 and their radii change by of the order of 10% during a pulsation cycle. Leavitt's work on Cepheids in the Magellanic Clouds led her to discover the relation between the luminosity and the period of Cepheid variables. Her discovery provided astronomers with the first "standard candle" with which to measure the distance to faraway galaxies.
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As well as being the prototype of the Cepheid class of variable stars, Delta Cephei is among the closest stars of this type of variable to the Sun, with only Polaris being nearer. Its variability is caused by regular pulsations in the outer layers of the star. It varies from magnitude 3.48 to 4.37, and its stellar classification also varies, from about F5 to G3. The pulsation period is 5.366249 days, with a rise to maximum occurring quicker than the subsequent decline to minimum.
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No orbital velocity shifts have been detected, so the orbital separation is probably large (several AU) and the orbital period is years or decades. In the "low state" (referring to the pre- outburst phase), the M giant pulsates and loses mass, and the pulsation was apparent in the 1930–1944 portion of the pre-outburst visible light curve. Some of the matter lost by the M giant accretes onto the white dwarf. This accreted matter is hydrogen-rich – that is, it has normal stellar composition.
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He said: "Part of my reason for wanting to do that was my annoyance at people telling me that black South Africans were not interested in astronomy." Medupe received his doctorate in astronomy from the University of Cape Town for a thesis that studied the oscillations in stellar atmospheres. In particular, he investigated the interaction of radiative transfer and pulsations in the atmospheres of stars by solving non-adiabatic pulsation equations. He works as a researcher at SAAO and as a lecturer at the University of Cape Town.
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The shapes of variable star light curves give valuable information about the underlying physical processes producing the brightness changes. For eclipsing variables, the shape of the light curve indicates the degree of totality, the relative sizes of the stars, and their relative surface brightnesses. It may also show the eccentricity of the orbit and distortions in the shape of the two stars. For pulsating stars, the amplitude or period of the pulsations can be related to the luminosity of the star, and the light curve shape can be an indicator of the pulsation mode.
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The stellar classification assigned to this star is A6 V, which indicates it is an A-type main-sequence star that is generating energy through hydrogen fusion at its core. The star's variability was first noticed by American astronomer Frank Schlesinger in 1914 and it has been given the variable star designation DD UMa. This is a low amplitude Delta Scuti variable with a magnitude change of around 0.4 and pulsation cycles of 9.4 and 15.0 cycles per day. It is rotating rapidly with a projected rotational velocity of about 158 km/s.
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Techniques alternative to jaw vibrato can be used to achieve a beautiful tone quality, but can also diverge noticeably from tone quality produced by classical jaw vibrato. The lip vibrato, which is often confused with the jaw vibrato, is produced by moving the lips in something like a “wa-wa-wa---” motion. However, this is more difficult to control, as it causes a greater disturbance to the basic embouchure. This type of pulsation tends to dominate the tone so much than the listener hears more vibrato than tone.
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Norman H. Baker was a professor of astronomy at Columbia University. He was born in Fergus Falls, Minnesota on October 23, 1931 and died on October 11, 2005 in Watertown, New York. His research primarily involved computational investigations of stellar structure and evolution; in particular, he focused on pulsating variable stars and he is considered as one of the founders of modern pulsation theory. From 1975 until 1983, he was the editor of the Astronomical Journal and served as president of IAU Commission 27 during the term of 1982 - 1985.
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MSOT can operate in three imaging modes: # anatomical imaging, which can be performed using a single wavelength of illuminating light and at multiple scales. This mode has been used to visualize various tissue structures and organs in laboratory animals and humans, including vasculature, kidney, heart, liver, brain and muscle. # functional/dynamic imaging, which can be performed at video rates to reveal changes in tissue contrast caused by hemodynamics, motion such as vessel pulsation, and uptake of drugs (pharmacodynamics). # biological / molecular imaging, which exploits the multi-spectral capability of MSOT.
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This area's music is characterized by extreme vocal tension, pulsation, melodic preference for perfect fourths and a range averring a tenth, rhythmic complexity, and increased frequency of tetratonic scales. The musics of the Arapaho and Cheyenne intensify these characteristics, while the northern tribes, especially Blackfoot music, feature simpler material, smaller melodic ranges, and fewer scale tones.Nettl, 1956, p. 112 Nettl Arapaho music includes ceremonial and secular songs, such as the ritualistic Sun Dance, performed in the summer when the various bands of the Arapaho people would come together.
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Zeta Cassiopeiae is a probable member of an unusual group of variable stars known as "Slowly Pulsating B" (SPB) stars. It shows a pulsation frequency of 0.64 per day (or once every 1.56 days) and displays a weak magnetic field with a strength of roughly , which varies with a period of 5.37 days. This likely matches the rotation rate of the star, which, when combined with the low projected rotational velocity, indicates the star may be seen nearly pole-on. Zeta Cassiopeiae is a candidate magnetic Bp star that shows an overabundance of helium.
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Fundamentally, a pulsation reactor can be described as a periodically transient tube-type reactor that can be used to thermally treat gas-borne matter. The pulsating flow of hot gas is generated within a hot gas generator in the reactor by burning natural gas or hydrogen with ambient air. The hot gas flows through the so-called “resonance tube” into which reactants in powder, liquid or gas form can be added. The reactant is treated by hot gas flowing through the resonance tube and this process ends through suitable cooling.
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Much of the current research concerning Virchow–Robin spaces relates to their known tendency to dilate. Research is presently being performed in order to determine the exact cause of dilation in these perivascular spaces. Current theories include mechanical trauma resulting from cerebrospinal fluid pulsation, elongation of ectactic penetrating blood vessels, and abnormal vascular permeability leading to increased fluid exudation. Further research has implicated shrinkage or atrophy of surrounding brain tissue, perivascular demyelination, coiling of the arteries as they age, altered permeability of the arterial wall and obstruction of lymphatic drainage pathways.
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Because dilated perivascular spaces are so closely correlated with cerebrovascular disease, there is much current research on their use as a diagnostic tool. In a recent study of 31 subjects, abnormal dilation, along with irregular CSF pulsation, were correlated with those subjects having three or more risk factors for strokes. Therefore, perivascular spaces are a possible novel biomarker for hemorrhagic strokes. CADASIL syndrome (cerebral autosomal dominant arteriopathy with subcortical infarcts and leukoencephalopathy syndrome) is a hereditary stroke condition due to a Notch 3 gene mutation on Chromosome 19.
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His early numerical calculations (with G. Shaviv) of a rotating gas sphere gravitational collapse (1980) were the first to show that a central object (a star) is formed surrounded by a protoplanetary disk-like nebula, provided turbulent viscosity is included. Together with J.R. Buchler he found a simplistic model of a stellar oscillator that exhibited chaotic pulsation. This oscillator was later found to be related to the Moore-Spiegel oscillator. He was among the discoverers of the advection dominated accretion flows (ADAF) which became a very popular idea in modeling accretion disks around black holes.
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George Boole's main focus was on psychologism, and Mary provided a more ideological view of his work. She supported the idea that arithmetic was not purely abstract as many believed, but more anthropomorphic. Pulsation was also important in her works and could be described as a sequence of mental attitudes, with her attention being analysis and synthesis. She believed that Indian logic played a role in the development of modern logic by her husband George Boole and others.Kak, S. (2018) George Boole’s Laws of Thought and Indian logic.
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BD Phoenicis is a Lambda Boötis star, an uncommon type of peculiar stars that have very low abundances of iron-peak elements. In particular, BD Phoenicis has near-solar carbon and oxygen content, but its iron abundance is only 4% the solar value. BD Phoenicis is also a pulsating variable of Delta Scuti type, varying its apparent magnitude between 5.90 and 5.94. A study of its light curve detected seven pulsation periods that range from 50 to 84 minutes, the strongest one having a period of 57 minutes and an amplitude of 9 milli- magnitudes.
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The background loss, of the round-trip loss ~\beta~ determines, what part of the energy of the laser field becomes unusable at each round-trip; it can be absorbed or scattered. At the self-pulsation, the gain lates to respond the variation of number of photons in the cavity. Within the simple model, the round-trip loss and the output coupling determine the damping parameters of the equivalent oscillator Toda. At the steady-state operation, the round-trip gain ~g~ exactly compensate both, the output coupling and losses: :~\exp(g)~(1-\beta-\theta)=1~.
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He learned to play the instrument, using both lead and rhythm styles, so that the guitar filled the place of drums. His early tarabaki drumming later influenced his guitar playing, particularly his rapid alternate picking technique. Dale referred to this as "the pulsation", noting all instruments he played derived from the tarabaki. He was raised in Quincy until he completed the eleventh grade at Quincy High School in 1954, when his father, a machinist, took a job working for Hughes Aircraft Company in the Southern California aerospace industry.
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With its flowing and wave-like movements, Pulsing perhaps recalls a body-memory of the foetal experience in the womb, where the baby is constantly subject to rhythmic pulsation, or of being cradled and rocked during infancy. Pulsing can take a number of forms, distinguished by the intent with which it is approached by both client and therapist (for example, relaxing, playful or as deeper emotional therapy). In the 'lighter' modes, clients sometimes experience gentle emotional release and often enter a trance-like state. Sessions usually have a deeply relaxing yet energising effect.
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Paravascular spaces are CSF-filled channels formed between the brain blood vessels and leptomeningeal sheathes that surround cerebral surface vessels and proximal penetrating vessels. Around these penetrating vessels, paravascular spaces take the form of Virchow-Robin spaces. Where the Virchow-Robin spaces terminate within the brain parenchyma, paravascular CSF can continue traveling along the basement membranes surrounding arterial vascular smooth muscle, to reach the basal lamina surrounding brain capillaries. CSF movement along these paravascular pathways is rapid and arterial pulsation has long been suspected as an important driving force for paravascular fluid movement.
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PSR B1257+12 was discovered by the Polish astronomer Aleksander Wolszczan on 9 February 1990 using the Arecibo radio telescope. It is a millisecond pulsar, a kind of neutron star, with a rotation period of 6.22 milliseconds (9,650 rpm), and was found to have anomalies in the pulsation period, which led to investigations as to the cause of the irregular pulses. In 1992 Wolszczan and Dale Frail published a famous paper on the first confirmed discovery of planets outside our solar system. Using refined methods one more planet was found orbiting this pulsar in 1994.
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It was following the release of "Deux Pieds sur Terre / Stick to Ground", and after various collaborations with musicians that Kohndo decided to form a live band to share the stage with him. In a few months of meetings and auditions, Kohndo had created the "Velvet Club" - composed of: Sebastien Artigue (Bass), Yann Massoubre (Drum), David Santhino (Keys), Thomas Agrinier (Guitar) and Dj Kozi (Turntables). Kohndo & Velvet Club have performed all over France, noticibale performances have been at the festivals "La Rue au Grand Palais", "Nancy Jazz Pulsation" and the "Printemps de Bourges".
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Most of these variations can be accounted for by the orbit of the two stars and material being transferred from the primary to the secondary, with the gas being involved in partial eclipses and possible also a partial eclipse of the primary star. The two stars are also distorted into ellipsoidal shapes by their gravity and vary in brightness as they rotate. In addition to the orbital variations, two pulsation modes have been observed with amplitudes of a few thousandths of a magnitude and periods of 0.77 and 1.42 days.
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The system includes leak detection, pressure monitoring and cathodic corrosion protection, fibre-optic telecommunications linking the mine site to Pointe Indienne, discharge end line choking and mass balance measurement. A single mainline pump station is located at the beneficiation plant. Two single stage, 1.5 MW positive displacement piston pumps, with variable speed drives, pressure pulsation dampeners and pressure relief devices are provided with one pump in operation and one standby. The system is designed to operate continuously for the life of the Project with a maximum operating pressure of 87 bar.
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The device of the love egg includes an egg- or bullet-shaped vibrating item with or sometimes without the wire. Variations include the remote control love egg, which can be activated by remote control using RF technology. There are also microchip controlled devices which can provide various patterns or irregularities in the vibration, rather than a uniform wave of vibration. For example, there can be the following patterns of vibrations: pulsating (short pulse-like vibrating sessions), escalation (vibrating motions that start with slow speed and stop abruptly), surging (mixture of pulsation and normal vibrating), etc.
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Some manufacturers of pulsation dampeners provide items which do not dampen pulsations. The compressibility of a gas, often nitrogen because it is inert at normal temperatures, stores any sudden volume change. Storing sudden volume change enables volume to change against a soft gas cushion, without the need to accelerate all the existing liquid in the system out of the way of the new volume coming from a pump. Therefore, as all the volume in a system does not have to be suddenly accelerated, the cushion is preventing "acceleration head" (force) having to be generated.
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The spectrum then develops hydrogen emission lines. For several days either side of maximum brightness, the spectrum becomes a relatively normal class K. RU Cam remained a somewhat unusual W Virginis variable until 1964, when the relatively regular pulsation of about 1 magnitude almost entirely stopped. Since then the pulsations have varied from cycle to cycle, with amplitudes changing from several tenths of a magnitude to almost zero. The light curve has a more sinusoidal shape than when it was pulsating at full amplitude and the period changes erratically between 17.4 and 26.6 days.
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This in turn allows one to determine the distance to the star, by comparing its known luminosity to its observed brightness. The term Cepheid originates from Delta Cephei in the constellation Cepheus, identified by John Goodricke in 1784, the first of its type to be so identified. The mechanics of the pulsation as a heat-engine was proposed in 1917 by Arthur Stanley Eddington (who wrote at length on the dynamics of Cepheids), but it was not until 1953 that S. A. Zhevakin identified ionized helium as a likely valve for the engine.
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Lymph transport is slow and sporadic. Despite low pressure, lymph movement occurs due to peristalsis (propulsion of the lymph due to alternate contraction and relaxation of smooth muscle tissue), valves, and compression during contraction of adjacent skeletal muscle and arterial pulsation. Lymph that enters the lymph vessels from the interstitial spaces usually does not flow backwards along the vessels because of the presence of valves. If excessive hydrostatic pressure develops within the lymph vessels, though, some fluid can leak back into the interstitial spaces and contribute to formation of edema.
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But the model was a suitable one in that it did unite and ensure some measure of order and stability. The effective scope of Garašanin's activities extended beyond the Serbian border and opened a way to the modernization of the country. One felt in Garašanin the irrepressible pulsation of the recently pacified uprisings, but also a sober program for an effective administration and free trade. His strength was all the more apparent in the light of Prince Alexander's impotence for the Prince merely reflected the glory of his great father Karađorđe.
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The Blazhko effect, which is sometimes called long-period modulation, is a variation in period and amplitude in RR Lyrae type variable stars. It was first observed by Sergey Blazhko in 1907 in the star RW Draconis. The physics behind the Blazhko effect is currently still a matter of debate, with there being three primary hypotheses. In the first, referred to as the resonance model, the cause of the modulation is a non-linear resonance among either the fundamental or the first overtone pulsation mode of the star and a higher mode.
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Low-amplitude radial velocity variations with a period of 613 days in the bright giant have suggested the possible presence of a substellar companion. If this is really due to a low-mass object, such a companion would be as small as 0.027 Solar masses (27 times the mass of Jupiter, probably a brown dwarf) and 3 astronomical units away from the bright primary. A substellar companion is only one of several hypotheses to explain the star's behaviour. Most likely the cause of the variation is weak pulsation of the star's atmosphere.
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Alpha Cygni variables are variable stars which exhibit non-radial pulsations, meaning that some portions of the stellar surface are contracting at the same time other parts expand. They are supergiant stars of spectral types B or A. Variations in brightness on the order of 0.1 magnitudes are associated with the pulsations, which often seem irregular, due to beating of multiple pulsation periods. The pulsations typically have periods of several days to several weeks. The prototype of these stars, Deneb (α Cygni), exhibits fluctuations in brightness between magnitudes +1.21 and +1.29.
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The relatively recently developed conical screw compressor is in effect a conical spiral extension of a gerotor. It does not have the inherent "blow-hole" leakage path which, in well designed screw compressors, is responsible for significant leakage through the assembly. This allows much smaller rotors to have practical efficiency since at smaller sizes the leakage area does not become as large a portion of the pumping area as in straight screw compressors. In conjunction with the decreasing diameter of the cone shaped rotor this also allows much higher compression ratios in a single stage with lower output pulsation.
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Pulsating variable stars sometimes have a single well- defined period, but often they pulsate simultaneously with multiple frequencies and complex analysis is required to determine the separate interfering periods. In some cases, the pulsations do not have a defined frequency, causing a random variation, referred to as stochastic. The study of stellar interiors using their pulsations is known as asteroseismology. The expansion phase of a pulsation is caused by the blocking of the internal energy flow by material with a high opacity, but this must occur at a particular depth of the star to create visible pulsations.
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The location of the system (circled in green). The system is located in the Messier 4 (M4) globular cluster. Like nearly all extrasolar planets discovered prior to 2008, PSR B1620-26 b was originally detected through the Doppler shifts its orbit induces on radiation from the star it orbits (in this case, changes in the apparent pulsation period of the pulsar). In the early 1990s, a group of astronomers led by Donald Backer, who were studying what they thought was a binary pulsar, determined that a third object was needed to explain the observed Doppler shifts.
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In a letter of 6 May 1904, to his brother William, James referred to himself as "always your hopelessly celibate even though sexagenarian Henry".Ignas Skrupskelis and Elizabeth Bradley (1994) p. 271. How accurate that description might have been is the subject of contention among James's biographers,Edel, 306–316 but the letters to Andersen were occasionally quasi-erotic: "I put, my dear boy, my arm around you, & feel the pulsation, thereby, as it were, of our excellent future & your admirable endowment."Zorzi (2004) His numerous letters to the many young homosexual men among his close male friends are more forthcoming.
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Zeta Geminorum (ζ Geminorum, abbreviated Zeta Gem, ζ Gem) is a bright star with cluster components, distant optical components and a likely spectroscopic partner in the zodiac constellation of Gemini -- in its south, on the left 'leg' of the twin Pollux. It is a classical Cepheid variable star, of which over 800 have been found in our galaxy. As such its regular pulsation and luminosity (proven in its class to correspond) and its relative proximity means the star is a useful calibrator in computing the cosmic distance ladder. Based on parallax measurements, it is approximately 1,200 light-years from the Sun.
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H-R diagram illustrating the location of Type II Cepheids in the instability strip Type II Cepheids are variable stars which pulsate with periods typically between 1 and 50 days. They are population II stars: old, typically metal- poor, low mass objects. Like all Cepheid variables, Type IIs exhibit a relationship between the star's luminosity and pulsation period, making them useful as standard candles for establishing distances where little other data is available Longer period Type II Cepheids, which are more luminous, have been detected beyond the Local Group in the galaxies NGC 5128 and NGC 4258.
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As such, it is much brighter than the Sun, emitting 14 times the luminosity from its outer atmosphere at an effective temperature of 8,939 K. This heat causes it to glow with the white-hot hue of an A-type star. 35 Aquilae is spinning rapidly with a projected rotational velocity of 110 km/s. In 1994 it was discovered that 35 Aquilae is a variable star with a pulsation period of just 30 minutes. It was determined to be a Delta Scuti variable, which is a type of star found on the instability strip that undergoes short period pulsations.
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Pulsating combustion was also used to generate hot gas for heating purposes and to fire boilers. The principle was tested in the eighties at the SKET Institute in Weimar to determine the suitability of pulsating combustion as a unit for performing thermal, material-modifying processes. The unit was already being referred to as a pulsation reactor by the Institute at that time. As well as the process of cement clinker firing, the manufacture of polishing agents from iron oxalate for the optical industry and the manufacture of surface-active catalyst substrates from gibbsite were also investigated.
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Absorption saturation, which results in decreased absorption at high incident light intensity, competes with other mechanisms (for example, increase in temperature, formation of color centers, etc.), which result in increased absorption. In particular, saturable absorption is only one of several mechanisms that produce self-pulsation in lasers, especially in semiconductor lasers. One atom thick layer of carbon, graphene, can be seen with the naked eye because it absorbs approximately 2.3% of white light, which is π times fine-structure constant. The saturable absorption response of graphene is wavelength independent from UV to IR, mid-IR and even to THz frequencies.
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The AFR sensor uses dedicated electronic circuitry to set a pumping current in the sensor's pump cell. In other words, if the air/fuel mixture is lean, the pump cell circuit voltage momentarily goes low and the ECM immediately regulates the current going through it in order to maintain a set voltage value or stoichiometric ratio inside the diffusion chamber. The pump cell then discharges the excess oxygen through the diffusion gap by means of the current created in the pump-cell circuit. The ECM senses the current and widens injector pulsation accordingly to add fuel.
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Stars of this type are characterized by changes of several dozen percent of the brightness on an average of half an hour (between 20-40 minutes). A detailed analysis of the observation results confirms that BLAP objects have a temperature of about 30,000 °C, and the cause for variability is pulsation. The construction model is similar to giant star models - 96% of the mass is concentrated in a core of only 20% of the radius of the entire star. The rest of the mass is a slightly ruffled envelope that pulsates at rapid rhythm - hence the large amplitude of the glare.
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God is younger-looking than on the outer panels, blue-eyed and with golden curls. His youthful appearance may be a device by the artist to illustrate the concept of Christ as the incarnation of the Word of God.Gibson, 92 God's right hand is raised in blessing, while he holds Eve's wrist with his left. According to the work's most controversial interpreter, the 20th-century folklorist and art historian Wilhelm Fraenger: > As though enjoying the pulsation of the living blood and as though too he > were setting a seal on the eternal and immutable communion between this > human blood and his own.
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It has steadily increased by around 4.5 seconds per year except for a hiatus in 1963–1965. This was originally thought to be due to secular redward evolution across the Cepheid instability strip, but it may be due to interference between the primary and the first-overtone pulsation modes. Authors disagree on whether Polaris is a fundamental or first-overtone pulsator and on whether it is crossing the instability strip for the first time or not. The temperature of Polaris varies by only a small amount during its pulsations, but the amount of this variation is variable and unpredictable.
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On the other hand, the same type of analysis shows that for the high L/M models κ is considerably larger (30% or higher). For the regular variables the small relative growth rates κ imply that there are two distinct time scales, namely the period of oscillation and the longer time associated with the amplitude variation. Mathematically speaking, the dynamics has a center manifold, or more precisely a near center manifold. In addition, it has been found that the stellar pulsations are only weakly nonlinear in the sense that their description can be limited powers of the pulsation amplitudes.
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These two properties are very general and occur for oscillatory systems in many other fields such as population dynamics, oceanography, plasma physics, etc. The weak nonlinearity and the long time scale of the amplitude variation allows the temporal description of the pulsating system to be simplified to that of only the pulsation amplitudes, thus eliminating motion on the short time scale of the period. The result is a description of the system in terms of amplitude equations that are truncated to low powers of the amplitudes. Such amplitude equations have been derived by a variety of techniques, e.g.
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In a study published in 2013, J. Iliff and colleagues demonstrated this directly. Using in vivo 2-photon microscopy, the authors reported that when cerebral arterial pulsation was either increased or decreased, the rate of paravacular CSF flux in turn increased or decreased, respectively. Astrocytes extend long processes that interface with neuronal synapses, as well as projections referred to as 'end- feet' that completely ensheathe the brain's entire vasculature. Although the exact mechanism is not completely understood, astrocytes are known to facilitate changes in blood flow and have long been thought to play a role in waste removal in the brain.
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Usually, both parameters ~u~ and ~v~ are supposed to be positive; then this speed-proportional friction coefficient grows exponentially at large positive values of coordinate ~x~. The potential ~\Phi(x)=e^x-x-1~ is a fixed function, which also shows exponential growth at large positive values of coordinate ~x~. In the application in laser physics, ~x~ may have a sense of logarithm of number of photons in the laser cavity, related to its steady-state value. Then, the output power of such a laser is proportional to ~\exp(x)~ and may show pulsation at oscillation of ~x~.
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The primary, Sigma Librae A, has a spectral class M2.5 III, which places it in the red giant stage of its evolution. This is a semi-regular variable star with a single pulsation period of 20 days. It shows small amplitude variations in magnitude of 0.10–0.15 on time scales as brief as 15–20 minutes, with cycles of repetition over intervals of 2.5–3.0 hours. This form of variability indicates that the star is on the asymptotic giant branch and is generating energy through the nuclear fusion of hydrogen and helium along concentric shells surrounding an inert core of carbon and oxygen.
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Further groundbreaking work was carried out by William Harvey, who published De Motu Cordis in 1628. Harvey made a detailed analysis of the overall structure of the heart, going on to an analysis of the arteries, showing how their pulsation depends upon the contraction of the left ventricle, while the contraction of the right ventricle propels its charge of blood into the pulmonary artery. He noticed that the two ventricles move together almost simultaneously and not independently like had been thought previously by his predecessors.Harvey, William De motu cordis, cited in Debus, Allen G. (1978) Man and Nature in the Renaissance.
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Strongly opinionated and demanding the respect of those in the academic community, Klein established a highly influential training program in psychoanalysis. By observing and analyzing the play and interactions of children, Klein built onto the work of Freud's unconscious mind. Her dive into the unconscious mind of the infant yielded the findings of the early Oedipus complex, as well as the developmental roots of the superego. Klein's theoretical work incorporates Freud's belief in the existence of the death pulsation, reflecting the notion that all living organisms are inherently drawn toward an "inorganic" state, and therefore, somehow, towards death.
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All V6 engines— regardless of the V-angle between the cylinder banks— are subject to a primary imbalance caused by each bank consisting of an inline-three engine, due to the odd number of cylinders in each bank. Straight-six engines and flat-six engines do not experience this imbalance. To reduce the vibrations caused by this imbalance, some V6 engines use counterweights on the crankshaft and/or a counter-rotating balance shaft. Six-cylinder designs have less pulsation in the power delivery than four- cylinder engines, due to the overlap in the power strokes of the six-cylinder engine.
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On November 6, 2009, the discovery of a planetary companion around primary star γ1 Leonis (γ Leonis A) was announced. The radial velocity measurements suggest two additional periodicities of 8.5 and 1340 days. The former is likely due to stellar pulsation, whereas the latter could be indicative of the presence of an additional planetary companion with 2.14 Jupiter masses, moderate eccentricity (e=0.13) and located at 2.6 Astronomical Units away from the giant star. Nevertheless, the nature of such a signal is still unclear and further investigations are needed to confirm or rule out an additional substellar companion.
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Wrist heart rate monitor Heart rate monitor with a wrist receiver Heart rate is measured by finding the pulse of the heart. This pulse rate can be found at any point on the body where the artery's pulsation is transmitted to the surface by pressuring it with the index and middle fingers; often it is compressed against an underlying structure like bone. The thumb should not be used for measuring another person's heart rate, as its strong pulse may interfere with the correct perception of the target pulse. The radial artery is the easiest to use to check the heart rate.
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This dimming lasts 640–730 days. In addition to this eclipse, the system also has a low amplitude pulsation with a non-consistent period of around 66 days. Epsilon Aurigae's eclipsing companion has been subject to much debate since the object does not emit as much light as is expected for an object its size. As of 2008, the most popularly accepted model for this companion object is a binary star system surrounded by a massive, opaque disk of dust; theories speculating that the object is a large, semitransparent star or a black hole have since been discarded.
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Tarlov cysts are known to have the tendency to enlarge over time. The prominent theory that explains this phenomenon reasons the enlargement of the cysts is due to the cerebrospinal fluid being pushed into the cyst during systole pulsation, but unable to get out during the diastole phase, resulting in enlargement observed in clinical settings over time. Increased ICP from trauma or other injury, childbirth, and overextertion are thought to trigger enlargement along with inflammation and hemorrhagic infiltration. With the cysts often containing a valve like mechanism fluid becomes trapped, and the meningeal sac or nerve sheath grows in size.
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On November 6, 2009, a planetary companion around primary star Gamma1 Leonis has been announced. Moreover, radial velocity variations would also hint two strong signals at 8.5 and 1340 days. The former periodicity is likely due to stellar pulsation, whereas the latter could be indicative of the presence of an additional planetary companion with 2.14 Jupiter masses, moderate eccentricity (e=0.13) and located at 2.6 Astronomical Units away from the giant star. Nevertheless, the nature of such a signal is still unclear and further investigations are needed to confirm or rule out an additional substellar companion.
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Kepler-70b (formerly known as its Kepler Object of Interest designation KOI-55.01; sometimes listed as KOI-55 b) is one of two postulated exoplanets orbiting the subdwarf B star (sdB) Kepler-70. The other planet is Kepler-70c, and both planets (if they exist) orbit very close to their host star. However, later research suggests that the two exoplanets probably do not exist, and that "pulsation modes visible beyond the cut-off frequency of the star" were a more likely explanation for the signals believed to indicate exoplanets. This is not proven with certainty one way or the other.
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RR Lyrae is a variable star in the Lyra constellation, figuring in its west near to Cygnus. As the brightest star in its class, it became the eponym for the RR Lyrae variable class of stars and it has been extensively studied by astronomers. RR Lyrae variables serve as important standard candles that are used to measure astronomical distances. The period of pulsation of an RR Lyrae variable depends on its mass, luminosity and temperature, while the difference between the measured luminosity and the actual luminosity allows its distance to be determined via the inverse-square law.
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Such yellow stars may be given a supergiant luminosity class despite their low masses but assisted by luminous pulsation. In the AGB thermal pulses from the helium-fusing shell of stars may cause a blue loop across the instability strip. Such stars will pulsate as W Virginis variables and again may be classified as relatively low luminosity yellow supergiants. When the hydrogen-fusing shell of a low or intermediate mass star of the AGB nears its surface, the cool outer layers are rapidly lost, which causes the star to heat up, eventually becoming a white dwarf.
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The distinction between the Lambda Boötis stars as a class of stars with peculiar spectra, and the delta Scuti stars whose class describes pulsation in low-overtone pressure modes, is an important one. While many Lambda Boötis stars pulsate and are delta Scuti stars, not many delta Scuti stars have Lambda Boötis peculiarities, since the Lambda Boötis stars are a much rarer class whose members can be found both inside and outside the delta Scuti instability strip. Lambda Boötis stars are dwarf stars that can be either spectral class A or F. Like BL Boötis-type stars they are metal-poor.
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The yellow-white hued primary, component A, has an apparent magnitude of +6.32 and stellar classification of F2 IV/V, showing mixed traits of an F-type main-sequence star and a subgiant. It is classified as a Delta Scuti type variable star and its brightness varies from magnitude +6.28 to +6.39 with a period of 3.25 hours. A 2000 observing campaign identified at least six independent pulsation modes for this variation. The companion star, component B, has an apparent magnitude of +9.65 and, as of 2000, is at an angular separation of along a position angle of 183°.
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Imperial cycles represent an "expanding pulsation" of "mathematically describable" macro-historic trend.Hornell Hart, "The Logistic Growth of Political Areas," Social Forces, 26, (1948): 396-7; Raoul Naroll, "Imperial Cycles and World Order," Peace Research Society, 7, (1967): 100-101. The List of largest empires contains imperial record progression in terms of territory or percentage of world population under single imperial rule. Chinese philosopher K'ang Yu-wei and French demographer Georges Vacher de Lapouge in the late 19th century were the first to stress that the trend cannot proceed indefinitely on the definite surface of the globe.
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This area's music is characterized by extreme vocal tension, pulsation, melodic preference for perfect fourths and a range averring a tenth, rhythmic complexity, and increased frequence of tetratonic scales. The musics of the Arapaho and Cheyenne intensify these characteristics, while the northern tribes, especially Blackfoot music, feature simpler material, smaller melodic ranges, and fewer scale tones. Nettl Arapaho music includes ceremonial and secular songs, such as the ritualistic Sun Dance, performed in the summer when the various bands of the Arapaho people would come together. Arapaho traditional songs consist of two sections exhibiting terraced descent, with a range greater than an octave and scales between four and six tones.
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Light curve of δ Cephei showing magnitude versus pulsation phase Graphs of the apparent magnitude of a variable star over time are commonly used to visualise and analyse their behaviour. Although the categorisation of variable star types is increasingly done from their spectral properties, the amplitudes, periods, and regularity of their brightness changes are still important factors. Some types such as Cepheids have extremely regular light curves with exactly the same period, amplitude, and shape in each cycle. Others such as Mira variables have somewhat less regular light curves with large amplitudes of several magnitudes, while the semiregular variables are less regular still and have smaller amplitudes.
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Under the Born-Alive Infants Protection Act of 2002, a woman who gives childbirth after an attempted abortion is the mother of a born-alive infant if the infant is observed with any of the following signs of life: breathing, heartbeat, pulsation of the umbilical cord, or confirmed voluntary muscle movement, regardless of the gestational age of the child. Although medical guidelines recommend withholding resuscitation for infants with practically no chance of surviving, and allow parental discretion if the chance of survival is marginal, any child that has a better-than-marginal chance of survival who is allowed to die would be considered the victim of infanticide or neonaticide.
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Dieulafoy lesions are characterized by a single abnormally large blood vessel (arteriole) beneath the gastrointestinal mucosa (submucosa) that bleeds, in the absence of any ulcer, erosion, or other abnormality in the mucosa. The size of these blood vessels varies from 1–5 mm (more than 10 times the normal diameter of mucosal capillaries). Pulsation from the enlarged vessels leads to focal pressure that causes thinning of the mucosa at that location, leading to exposure of the vessel and subsequent hemorrhage. Approximately 75% of Dieulafoy's lesions occur in the upper part of the stomach within 6 cm of the gastroesophageal junction, most commonly in the lesser curvature.
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An additional advantage is the discharge chamber that is created – its volume remains absolutely constant during the course of displacement. This leads to the possibility of conveying and filling media containing solids and even pieces. Compared to other conveying methods, this pumping technology has even more advantages to offer: For example, in over 95% of all applications it is possible to eliminate filling and dosing valves completely, since the pump goes into reverse flow at the end of dosing, which breaks off the product thread or prevents any dripping. It is possible to dispense low to high viscous products very precise, stabile and free of pulsation.
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CW Leonis is believed to be in a late stage of its life, blowing off its own sooty atmosphere to form a white dwarf in a distant future. Based upon isotope ratios of magnesium, the initial mass of this star has been constrained to lie between 3–5 solar masses. The mass of the star's core, and the final mass of the star once it becomes a white dwarf, is about 0.7–0.9 solar masses. Its bolometric luminosity varies over the course of a 649-day pulsation cycle, ranging from a minimum of about 6,250 times the Sun's luminosity up to a peak of around 15,800 times.
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703, et alibi that the use of respiration was to fill the arteries with air;Galen, de Usu, Respir. c. 1. vol. iv. p. 471 and that the pulsation of the arteries was caused by the movements of the pneuma. He accounted for diseases in the same way, and supposed that as long as the pneuma continued to fill the arteries and the blood was confined to the veins, the individual was in good health; but that when the blood from some cause or other got forced into the arteries, inflammation and fever was the consequence.Galen, de Venae Sect. adv. Erasistr. c. 2. vol. xi. p.
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Single, large blades produce more fish-attracting vibration, increase skirt and trailer pulsation, and provide added lift to the bait on the slowest retrieves. Long-arm baits are typically preferred for "waking a spinnerbait." Disadvantages: the long arm sometimes actually blocks the hook point, especially when larger fish crush the entire lure in their mouth, thus reducing the lure's hook-up efficiency. Because of the position of the blade relative to the lure's body, long-arm spinnerbaits tend to nose-dive when the retrieve is stopped, which means the hook no longer points toward the angler, reducing the hook-up effectiveness of the lure.
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Three stars with Bayer designations that lie within the Great Square are variable stars. Phi and Psi Pegasi are pulsating red giants, while Tau Pegasi (the proper name is Salm), is a Delta Scuti variable—a class of short period (six hours at most) pulsating stars that have been used as standard candles and as subjects to study astroseismology. Rotating rapidly with a projected rotational velocity of 150 km s−1, Kerb is almost 30 times as luminous as the Sun and has a pulsation period of 56.5 minutes. With an outer atmosphere at an effective temperature of 7,762 K,it a white star with a spectral type of A5IV.
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Gow-Gates technique is used to provide anesthetics to the mandible of the patient's mouth. With the aid of extra and intraoral landmarks, the needle is injected into the intraoral latero-anterior surface of the condyle, steering clear below the insertion of the lateral pterygoid muscle. The extraoral landmarks used for this technique are the lower border of the ear tragus, corners of the mouth and the angulation of the tragus on the side of the face. Biophysical forces (pulsation of the maxillary artery, muscular function of jaw movement) and gravity will aid with the diffusion of anesthetic to fill the whole pterygomandibular space.
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The visible component is an A-type main-sequence star with a stellar classification of A7 V. Observations with the BRITE constellation led to this star's identification as a Delta Scuti variable with pulsation periods of 31.0806 and 34.2098 days. It has a high rate of spin with a projected rotational velocity of 155 km/s, which is giving the star an oblate shape with an equatorial bulge that is 6% larger than the polar radius. The star is roughly 453 million years old with 1.8 times the mass of the Sun. It is radiating 16 times the Sun's luminosity from its photosphere at an effective temperature of 8,331 K.
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26 And is radiating 219 times the Sun's luminosity from its photosphere at an effective temperature of 11,939 K. It displays an infrared excess that suggests a circumstellar debris disk orbiting at a distance of from the star with a temperature of 75 K. The fainter secondary, component B, is a magnitude 9.70 star located from the primary. It is an F-type main-sequence star with a class of F3 V that shows an unexplained long term variability. One of the components of this system displays a slight photometric variation with a period of 3.16 days. This may be caused by pulsation or an ellipsoidal variation.
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FO Aquarii is an intermediate polar star system in the constellation Aquarius. The white dwarf and companion star orbit each other with a period of approximately 4.85 hours. The system is famous for a very strong optical pulsation which occurs every 20.9 minutes, corresponding with the rotational period of the accreting white dwarf. Prior to 2016, the system's long-term optical brightness varied between apparent magnitude 12.7 and 14.2, but in early 2016, it faded to magnitude 15.8 and thereafter began a slow recovery to its normal brightness, behavior which is indicative of a temporary dropoff in the mass-transfer rate between the two stars.
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However, this definition is only applicable while a storm maintains these characteristics—when and while a storm does not feature annular characteristics, the tropical cyclone is considered asymmetric. In addition to the primary defining characteristics, the diurnal pulsation of the cirrus cloud canopy associated with outflow is subdued once storms become annular. Some annular tropical cyclones may also display a "pinwheel eye", a feature in which conditions in the storm causes its eye to take the appearance of a spoked wheel. An algorithm for identification of annular tropical cyclones in real-time by objective criteria has been developed, and shows some power, but is not yet operational.
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Hertzsprung–Russell diagram showing the location of several types of variable stars superimposed on a display of the different luminosity classes. Classical Cepheids (also known as Population I Cepheids, Type I Cepheids, or Delta Cepheid variables) are a type of Cepheid variable star. They are population I variable stars that exhibit regular radial pulsations with periods of a few days to a few weeks and visual amplitudes from a few tenths of a magnitude to about 2 magnitudes. There exists a well-defined relationship between a classical Cepheid variable's luminosity and pulsation period, securing Cepheids as viable standard candles for establishing the galactic and extragalactic distance scales.
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Viscoelasticity is a property of human blood that is primarily due to the elastic energy that is stored in the deformation of red blood cells as the heart pumps the blood through the body. The energy transferred to the blood by the heart is partially stored in the elastic structure, another part is dissipated by viscosity, and the remaining energy is stored in the kinetic motion of the blood. When the pulsation of the heart is taken into account, an elastic regime becomes clearly evident. It has been shown that the previous concept of blood as a purely viscous fluid was inadequate since blood is not an ordinary fluid.
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This indicates the star has reached a stage in its evolution where it has expanded to become a supergiant with 169 times the radius of the Sun. As this is a massive star with 8–13 times the mass of the Sun, it rapidly burns through its supply of nuclear fuel and has become a supergiant in roughly , after spending as a main sequence star. l Carinae is classified as a Cepheid variable star and its brightness varies over an amplitude range of 0.725 in magnitude with a long period of 35.560 days. The radial velocity of the star likewise varies by 39 km/s during each pulsation cycle.
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Stars above will have enough mass to create pairs of electrons and positrons; in these stars there will be greater pair production than in stars less than . Stars of 130 to will often undergo pulsational pair-instability supernovae and potentially undergo more than one pulsation to bring its mass under although they can potentially go full supernova. Stars above will generally produce much greater levels of electron- positron pairs and will usually produce more than just that required of a pulsational pair-instability supernova. The star will heat up more than in the stars and the thermal runaway reaction when the oxygen fuel ignites will be far greater.
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Ovarian drilling was first used in the treatment of PCOS in 1984 and has evolved as a safe and effective surgery. After performing laparoscopic electrosurgical ovarian drilling in CC-resistant patients in 1984, Gjönnaess found that this technique increased ovulation rates to 45 percent and pregnancy rates to 42 percent. In 1988, laparoscopic multiple punch resection of ovaries on the hypothalamo-pituitary axis, slightly modified from Gjönnaess's operation, caused a reduction in LH pulsation and pituitary responsiveness in the treatment of PCOS. In 1989, ovarian drilling was conducted with argon, carbon dioxide (CO2) or potassium-titanyl-phosphate (KTP) laser vaporization causing spontaneous ovulation in 71 percent of those treated.
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At small (but still positive) values of ~u~ and ~v~, the pulsation decays slowly, and this decay can be described analytically. In the first approximation, the parameters ~u~ and ~v~ give additive contributions to the decay; the decay rate, as well as the amplitude and phase of the nonlinear oscillation, can be approximated with elementary functions in a manner similar to the period above. In describing the behavior of the idealized Toda oscillator, the error of such approximations is smaller than the differences between the ideal and its experimental realization as a self- pulsing laser at the optical bench. However, a self-pulsing laser shows qualitatively very similar behavior.
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In 1996, a possible Saturn-like (100 Earth mass) gas giant was announced orbiting the pulsar at a distance of about 40 AU. The original hypothesis was retracted and a reinterpretation of the data led to a new hypothesis of a dwarf planet one fifth the size of Pluto orbiting PSR B1257+12 at an average orbital distance of 2.4 AU with an orbital period of approximately 4.6 years. The dwarf planet hypothesis was also retracted because further observations showed that the pulsation anomalies previously thought to reveal a fourth orbital body are "not periodic and can be fully explained in terms of slow changes in the pulsar's dispersion measure".
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It was demonstrated that the substitution of worker's efforts with work of the production equipment appears to be more adequate idea than the substitution of worker's efforts with the amount of production equipment (capital in the neo- classical theory of economic growth); work can be replaced onky with work, not with capital. The theory demonstrates that the growth of production is caused by achievements in technological consumption of labour and energy. The set of equations determines three modes of economic development, depending on deficit of one of the factors: investment, labour or substitutive work.Pokrovskii, V.N. (2011) Pulsation of the growth rate of output and technology.
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In pathology, over two hundred terms described organic conditions, such as thuhuzen meaning a deep bronchial cough, zen meaning largyneal cough, and tiptec meaning intestinal pain with pulsation, speculated to have been appendicitis. The Maya acknowledged mental afflictions such as melancholia and hallucinations, were capable of understanding the grouping of symptoms relating to contagious diseases, and identified several diseases including pinta and leishmaniasis. The medicine men of ancient Maya society provided many services to their communities and were held in high regard. Known for their extensive knowledge and spirituality, medicine men were called upon for many reasons, but most often for their healing capabilities.
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Buried deep in the lower third of the keyboard where the close > motion and full chords speak with difficulty, the irregular placement of > slurred two-note motifs in triple time creates an ambiguous pulsation, which > the later appearance of a light, chirping melody does nothing to clarify. > This play with rhythm and sound was a rare experiment for Prokofiev, whose > preferred musical genre was the march, and whose consistent rhythmic > intelligibility is a joy for ballet dancers everywhere. The second movement > provides no respite from the darkness. The cloudy atmosphere persists, > created by the multiple layers of musical activity, which also reflects the > movement’s origins as a symphonic work.
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It is a high-amplitude δ Scuti type pulsator with light variations of about 0.15 minutes. The peculiar chemical abundances of this star are similar to those of Am stars. In 1900, William W. Campbell and William H. Wright used the Mills spectrograph at the Lick Observatory to determine that this star has a variable radial velocity. The -day period of this variability as well as 0.2 magnitude changes in luminosity demonstrated in 1935 that the variability was intrinsic, rather than being the result of a spectroscopic binary. In 1938, a secondary period was discovered and a pulsation theory was proposed to model the variation.
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For some types of X-ray pulsars, the companion star is a Be star that rotates very rapidly and apparently sheds a disk of gas around its equator. The orbits of the neutron star with these companions are usually large and very elliptical in shape. When the neutron star passes nearby or through the Be circumstellar disk, it will capture material and temporarily become an X-ray pulsar. The circumstellar disk around the Be star expands and contracts for unknown reasons, so these are transient X-ray pulsars that are observed only intermittently, often with months to years between episodes of observable X-ray pulsation.
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Although it is uncommon, women sometimes give birth in spite of an attempted abortion. Alt URL Reporting of livebirth after attempted abortion may not be consistent from state to state, but 38 were recorded in one study in upstate New York in the two-and-a-half years before Roe v. Wade. Under the Born-Alive Infants Protection Act of 2002, medical staff must report live birth if they observe any breathing, heartbeat, umbilical cord pulsation, or confirmed voluntary muscle movement, regardless of whether the born-alive is non-viable ex utero in the long term because of birth defects, and regardless of gestational age, including gestational ages which are too early for long-term viability ex utero.
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The RGB OSARGs follow three closely spaced period-luminosity relations, corresponding to the first, second, and third overtones of radial pulsation models for stars of certain masses and luminosities, but that dipole and quadrupole non-radial pulsations are also present leading to the semi-regular nature of the variations. The fundamental mode does not appear, and the underlying cause of the excitation is not known. Stochastic convection has been suggested as a cause, similar to solar-like oscillations. Two additional types of variation have been discovered in RGB stars: long secondary periods, which are associated with other variations but can show larger amplitudes with periods of hundreds or thousands of days; and ellipsoidal variations.
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The primary component of this system, Epsilon Persei A, is a massive star with 12–16 times the Sun's mass and near eight times the radius of the Sun. It has a stellar classification of B0.5 V, making it a B-type main sequence star that is generating energy at its core through the nuclear fusion of hydrogen. Component A is radiating over 28,000 times the Sun's luminosity from its outer envelope at an effective temperature of 26,500 K. This gives the star the blue-white hue that is typical of B-type stars. Epsilon Persei A is a Beta Cephei variable star with a primary pulsation period of 0.1603 days, or 6.24 cycles per day.
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By using the HARPS instrument, astronomers detected for the first time a double star where a pulsating Cepheid variable and another star pass in front of one another, which allows to measure the mass of the Cepheid. The study concluded that the mass prediction coming from the theory of stellar pulsation was correct while the value calculated was at odds with the theory of stellar evolution. The discovery of the extrasolar planet Gliese 581 c by the team of Stéphane Udry at University of Geneva's Observatory in Switzerland was announced on April 24, 2007. The team used the telescope's HARPS spectrograph, and employed the radial velocity technique to identify the planet's influence on the star.
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The music of the Salish tribes, and even more so the Northwest coast, intensifies the significant features of Inuit music, their melodic movement is often pendulum-type ("leaping in broad intervals from one limit of the range to the other"). The Northwest coast music also "is among the most complicated on the continent, especially in regard to rhythmic structure," featuring intricate rhythmic patterns distinct from but related to the vocal melody and rigid percussion. He also reports unrecorded use of incipient polyphony in the form of drones or parallel intervals in addition to antiphonal and responorial forms. Vocals are extremely tense, producing dynamic contrast, ornamentation, and pulsation, and also often using multiple sudden accents in one held tone.
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The other research fields of the institute include solar astronomy, stellar astronomy, star clusters, stellar variability and pulsation, photometric studies of nearby galaxies, Quasars, and transient events like supernovae and highly energetic Gamma-Ray Bursts (GRBs). A total solar eclipse lasting about 4 minutes was successfully observed from Manavgat, Antalya in Turkey on 29 March 2006 by a team of scientists from the Institute. In past, new ring systems around Saturn, Uranus, and Neptune were discovered from the observatory. Recently, for the first time a direct correlation between the intra-night optical variability and the degree of polarization of the radio jets in Quasars was established based on the observations from ARIES.
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Beware the Heavens is the first album by the power metal band Sinergy, released in 1999. The album features two instrumental tracks "Born Unto Fire and Passion" and "Pulsation", and a track inspired by the series Xena: The Warrior Princess, entitled "The Warrior Princess". Some melodies that can be heard in the song "Beware the Heavens" were sampled from a song called "Translucent image" by IneartheD (now known as Children of Bodom); the song is featured on IneartheD's 1995 demo Ubiquitous Absence Of Remission. This is the only album where Jesper Strömblad (In Flames guitarist) plays guitar alongside Alexi Laiho; his position was filled in by Roope Latvala on all subsequent albums.
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A Cyclic pump is an apparatus which moves a fluid in a periodic uni- directional direction from one containment system to another while overcoming static conditions that would, without intervention, not move. The intervention predicated by the pump alters pressures, volumes and sometimes temperatures of fluids (gaseous, liquid, colloidal, plasmic, etc.) in such a way that the fluids are transported to other chambers or enclosures (including pipes), thus "flowing" in a consistent direction, usually having characteristics of pulsation (as is the case with the Human heart) or of uniform motion (as is the case with an Automobile motor oil pump). Cyclic pumps are generally incorporated into machines to deal with all sorts of fluids associated with that machine's functionality.
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If on the other hand the air/fuel mixture goes rich, the pump cell circuit voltage rapidly climbs high and the ECM immediately reverses the current polarity to readjust the pump cell circuit voltage to its set stable value. The pump cell then pumps oxygen into the monitoring chamber by way of the reversed current in the ECM's AFR pump cell circuit. The ECM detects the reversed current and an injector pulsation-reduction command is issued bringing the mixture back to lean. Since the current in the pump cell circuit is also proportional to the oxygen concentration or deficiency in the exhaust, it serves as an index of the air/fuel ratio.
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Palpitations are the perceived abnormality of the heartbeat characterized by awareness of cardiac muscle contractions in the chest, which is further characterized by the hard, fast and/or irregular beatings of the heart. Symptoms include a rapid pulsation, an abnormally rapid or irregular beating of the heart. Palpitations are a sensory symptom and are often described as a skipped beat, rapid fluttering in the chest, pounding sensation in the chest or neck, or a flip-flopping in the chest. Palpitation can be associated with anxiety and does not necessarily indicate a structural or functional abnormality of the heart, but it can be a symptom arising from an objectively rapid or irregular heartbeat.
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As Dillon & Dickins, their Steers & Queers EP (catalogue numbers 99NTH15 & CDNTH15), released on Higher State's sublabel 99 North in May 1999, contained a track entitled "Queers R Doin It" which was used in the U.S. TV series Queer As Folk. Having released a number of unofficial so-called Mashup songs under the alias of Illicit, one of their first official releases under this alias was "Pulsation" featuring Shannon (best known for her vocals on "Let the Music Play"), released on 99 North in 2000. However, their most successful chart bound release was "Cheeky Armada", released in September 2001 on Azuli's Yola label, which reached number 72 in the UK Singles Chart.Roberts, David.
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Fiddler's neck usually involves highly localized lichenification, mild hyperpigmentation, and erythema where the chin rest or instrument body presses against the skin of the neck. Other signs and symptoms include scale buildup, cyst and scar formation, papules and pustules related to local infection, and focal edema. In Blum & Ritter's study in West Germany (1990), they found that 27% of their population had only minor issues, 72% had a palpable mass at the site, and 23% reported pain and other signs of inflammation such as hyperthermia, pulsation, and cystic, pustular, or papular lesions. Size of masses were an average of 2 cm in diameter ranging up to 4 cm, some being associated with purulent drainage, continuous discharge, and crusting.
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The glymphatic system (or glymphatic clearance pathway, or paravascular system) is a functional waste clearance pathway for the vertebrate central nervous system (CNS). The pathway consists of a para-arterial influx route for cerebrospinal fluid (CSF) to enter the brain parenchyma, coupled to a clearance mechanism for the removal of interstitial fluid (ISF) and extracellular solutes from the interstitial compartments of the brain and spinal cord. Exchange of solutes between CSF and ISF is driven primarily by arterial pulsation and regulated during sleep by the expansion and contraction of brain extracellular space. Clearance of soluble proteins, waste products, and excess extracellular fluid is accomplished through convective bulk flow of ISF, facilitated by astrocytic aquaporin 4 (AQP4) water channels.
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Researchers now prefer to categorize these as AGB stars distinct from supergiants because they are less massive, have different chemical compositions at the surface, undergo different types of pulsation and variability, and will evolve in a different way, usually producing a planetary nebula and white dwarf. Most AGB stars will not become supernovae although there is interest in a class of super-AGB stars, those almost massive enough to undergo full carbon fusion, which may produce peculiar supernovae although without ever developing an iron core. One notable group of low mass high luminosity stars are the RV Tauri variables, AGB or post-AGB stars lying on the instability strip and showing distinctive semi-regular variations.
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The pulsation of the drum beats produced by the drummer may be considered the "heartbeat" of the dragon boat. The drummer leads the paddlers throughout a race using the rhythmic drum beat to indicate the frequency and synchronization of all the paddlers' strokes (that is, the cadence, picking up or accelerating the pace, slowing the rate, etc.). The drummer may issue commands to the crew through a combination of hand signals and voice calls, and also generally exhorts the crew to perform at their peak. A drummer is typically mandatory during racing events, but if he or she is not present during training, it is typical for the sweep to direct the crew during a race.
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The novel also includes references to his new physiology and his theories of pulmonary circulation and pulsation, which he uses to justify bodily resurrection. Some have thus argued that it was his attempts at proving bodily resurrection that led him to his discovery of the pulmonary circulation. Later Islamic scholars viewed this work as a response to Avicenna's metaphysical claim that bodily resurrection cannot be proven through reason, a view that was earlier criticized by al-Ghazali. The plot of Theologus Autodidactus was intended to be a response to Ibn Tufail (Abubacer), who wrote the first Arabic novel Hayy ibn Yaqdhan (Philosophus Autodidactus) which was itself a response to al-Ghazali's The Incoherence of the Philosophers.
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The course of reminiscence and of the thoughts generally, when not immediately dependent upon external sensation, is accounted for by the idea that there are always vibrations in the brain on account of its heat and the pulsation of its arteries. The nature of these vibrations is determined by each man's past experience, and by the circumstances of the moment, which causes one or another tendency to prevail over the rest. Sensations which are often associated together become each associated with the ideas corresponding to the others; and the ideas corresponding to the associated sensations become associated together, sometimes so intimately that they form what appears to be a new simple idea, not without careful analysis resolvable into its component parts.
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The music of the Salish tribes, and even more so the Northwest coast, intensifies the significant features of Inuit music, see below, however their melodic movement is often pendulum-type ("leaping in broad intervals from one limit of the range to the other"). The Northwest coast music also "is among the most complicated on the continent, especially in regard to rhythmic structure," featuring intricate rhythmic patterns distinct from but related to the vocal melody and rigid percussion. He also reports unrecorded use of incipient polyphony in the form of drones or parallel intervals in addition to antiphonal and responorial forms. Vocals are extremely tense, producing dynamic contrast, ornamentation, and pulsation, and also often using multiple sudden accents in one held tone.
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Antares near the Sun on 30 NovemberRadial velocity variations were observed in the spectrum of Antares in the early 20th century and attempts were made to derive spectroscopic orbits. It became apparent that the small variations could not be due to orbital motion, and were actually caused by pulsation of the star's atmosphere. Even in 1928, it was calculated that the size of the star must vary by about 20%. Antares was first reported to have a companion star by Johann Tobias Bürg during an occultation on April 13, 1819, although this was not widely accepted and dismissed as a possible atmospheric effect. It was then observed by Scottish astronomer James William Grant FRSE while in India on 23 July 1844.
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Blood flowed from both creating organs to all parts of the body where it was consumed and there was no return of blood to the heart or liver. The heart did not pump blood around, the heart's motion sucked blood in during diastole and the blood moved by the pulsation of the arteries themselves. Galen believed that the arterial blood was created by venous blood passing from the left ventricle to the right by passing through 'pores' in the interventricular septum, air passed from the lungs via the pulmonary artery to the left side of the heart. As the arterial blood was created 'sooty' vapors were created and passed to the lungs also via the pulmonary artery to be exhaled.
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Blood flowed from both creating organs to all parts of the body where it was consumed and there was no return of blood to the heart or liver. The heart did not pump blood around, the heart's motion sucked blood in during diastole and the blood moved by the pulsation of the arteries themselves. Galen believed that the arterial blood was created by venous blood passing from the left ventricle to the right by passing through 'pores' in the interventricular septum, air passed from the lungs via the pulmonary artery to the left side of the heart. As the arterial blood was created 'sooty' vapors were created and passed to the lungs also via the pulmonary artery to be exhaled.
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In this concept, the conventional solid fission NTR can operate in a stationary as well as in a pulsed mode, much like a TRIGA reactor. Because the residence time of the propellant in the chamber is short, an important amplification in energy is attainable by pulsing the nuclear core, which can increase the thrust via increasing the propellant mass flow. However, the most interesting feature is the capability to obtain very high propellant temperatures (higher than the fuel) and then high amplification of exhaust velocity. This is because, in contrast with the conventional stationary solid NTR, propellant is heated by the intense neutron flux from the pulsation, which is directly transported from the fuel to the propellant as kinetic energy.
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Mira, the prototype of the Mira variables Mira variables (named for the prototype star Mira) are a class of pulsating stars characterized by very red colours, pulsation periods longer than 100 days, and amplitudes greater than one magnitude in infrared and 2.5 magnitude at visual wavelengths. They are red giants in the very late stages of stellar evolution, on the asymptotic giant branch (AGB), that will expel their outer envelopes as planetary nebulae and become white dwarfs within a few million years. Mira variables are stars massive enough that they have undergone helium fusion in their cores but are less than two solar masses, stars that have already lost about half their initial mass. However, they can be thousands of times more luminous than the Sun due to their very large distended envelopes.
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The acute toxicity of hexane is rather low. Inhalation of n-hexane at 5000 ppm for 10 minutes produces marked vertigo; 2500-1000 ppm for 12 hours produces drowsiness, fatigue, loss of appetite, and paresthesia in the distal extremities; 2500–5000 ppm produces muscle weakness, cold pulsation in the extremities, blurred vision, headache and anorexia. Chronic occupational exposure to elevated levels of n-hexane has been demonstrated to be associated with peripheral neuropathy in auto mechanics in the US, and neurotoxicity in workers in printing presses, and shoe and furniture factories in Asia, Europe, and North America. The US National Institute for Occupational Safety and Health (NIOSH) has set a recommended exposure limit (REL) for hexane isomers (not n-hexane) of 100 ppm () over an 8-hour workday.
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His axial stones are delicately balanced sculptures of two (occasionally three) stones positioned one upon another at the most precarious point discovered.Axial Stones: An Art of Precarious Balance (North Atlantic Books: 2006), foreword Carter Ratcliff "Axial" refers to the invisible axis that comes into focus at the moment of precarious balance. In addition to axial stones, Quasha has created axial drawings, executed with two hands simultaneously; axial drumming/music, non-metrical pulsation-based rhythm arising from interaction of instruments, sounds, surfaces; and axial poems, discovering points of charged variability in actual language use and bringing about a self-actualizing process. For his video installation work art is: Speaking Portraits, which includes multiple volumes (art is, music is, poetry is, he has recorded over 800 artists, poets, and composers (in 11 countries and 21 languages).
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Later, it became clear that the period variations followed a 2.09 day sinusoidal curve around the 4.84 second period. These variations in arrival time of the pulses were attributed to the Doppler effect caused by orbital motion of the source, and were therefore evidence for the binary nature of Centaurus X-3. Despite detailed data from the Uhuru satellite as to the orbital period of the binary, and the pulsation period in the X-ray band as well as the minimum mass of the occulting star, the optical component remained undiscovered for three years. This was partly because Cen X-3 lies in the plane of the Galaxy in the direction of the Carina Spiral Arm, and so observations were forced to differentiate among dozens of faint objects.
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Light curve of Delta Cephei, the prototype of classical cepheids, showing the regular variations produced by intrinsic stellar pulsations Classical Cepheids (also known as Population I Cepheids, type I Cepheids, or Delta Cepheid variables) undergo pulsations with very regular periods on the order of days to months. Classical Cepheids are Population I variable stars which are 4–20 times more massive than the Sun, and up to 100,000 times more luminous. These Cepheids are yellow bright giants and supergiants of spectral class F6 – K2 and their radii change by (~25% for the longer-period I Carinae) millions of kilometers during a pulsation cycle. Classical Cepheids are used to determine distances to galaxies within the Local Group and beyond, and are a means by which the Hubble constant can be established.
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None of these known sources were convincing associations to the gamma-ray source, and the SAS-2 team suggested that an undiscovered radio-pulsar was the most likely progenitor. Despite the investment of a significant amount of observation time, the source remained unidentified through the COS-B era; their data did, however, rule out the claimed 59 s pulsation. Many claims were made about the source during this time, but its nature remained a mystery until the identification of a candidate source by the Einstein x-ray satellite, 1E 0630+178. The characteristics of the x-ray source were unique: large x-ray to optical luminosity, no radio emission detected by the sensitive VLA instrument, point-like emission in the Einstein imager and an estimated distance of approximately 100 pc, placing it within the Galaxy.
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An association between the gamma-ray and x-ray sources was not conclusively made until the ROSAT x-ray imager detected a 237 ms pulsation, which was also seen in gamma- rays by the EGRET instrument and retrospectively in the COS-B and SAS-2 data. Geminga thus appeared to be the first example of a radio-quiet pulsar, and served as an illustration of the difficulty of associating gamma-ray emission with objects known at other wavelengths: some characteristic of the gamma-ray source, such as periodicity or variability, must be identified in candidate counterparts at other wavelengths in order to make the connection of their identity. Finally, this principle held true when radio emissions of matching 237 ms periodicity were found at previously unsurveyed frequencies of 100 MHz and below.
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The evolution of the PSR B1620−26 system PSR B1620−26 b was originally detected through the Doppler shifts its orbit induces on signals from the star it orbits (in this case, changes in the apparent pulsation period of the pulsar). In the early 1990s, a group of astronomers led by Donald Backer, studying what they thought was a binary pulsar, determined that a third object was needed to explain the observed Doppler shifts. Within a few years, the gravitational effects of the planet on the orbit of the pulsar and white dwarf had been measured, giving an estimate of the mass of the third object that was too small for it to be a star. The conclusion that the third object was a planet was announced by Stephen Thorsett and his collaborators in 1993.
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Blood flow in the intracranial OA segment is affected by intracranial pressure, while flow in the extracranial (intraorbital) OA segment is influenced by the externally applied pressure (Pe) to the eyeball and orbital tissues. As with a sphygmomanometer, a special pressure cuff is used - in this case, to compress the tissues surrounding the eyeball and also intraorbital tissues surrounding the extracranial segment of OA. External pressure changes the characteristics of blood flowing from inside the skull cavity into the eye socket. In place of the stethoscope, a Doppler ultrasound beam measures the blood flow pulsations in intracranial and extracranial segments of the ophthalmic artery. The non- invasive ICP meter based on this method gradually increases the pressure over the eyeball and intraorbital tissues so that the blood flow pulsation parameters in two sections of the OA are equal.
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In 2002, the U.S. Government enacted the Born-Alive Infants Protection Act. Whereas a fetus may be viable or not viable in utero, this law provides a legal definition for personal human life when not in utero. It defines "born alive" as "the complete expulsion or extraction from his or her mother of that member, at any stage of development, who after such expulsion or extraction breathes or has a beating heart, pulsation of the umbilical cord, or definite movement of voluntary muscles" and specifies that any of these is the action of a living human person. While the implications of this law for defining viability in medicine may not be fully explored, in practice doctors and nurses are advised not to resuscitate such persons with gestational age of 22 weeks or less, under 400 g weight, with anencephaly, or with a confirmed diagnosis of trisomy 13 or 18.
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This regular behavior is in contrast with the variability of stars that lie parallel to and to the high-luminosity/low-temperature side of the classical variable stars in the Hertzsprung–Russell diagram. These giant stars are observed to undergo pulsations ranging from weak irregularity, when one can still define an average cycling time or period, (as in most RV Tauri and semiregular variables) to the near absence of repetitiveness in the irregular variables. The W Virginis variables are at the interface; the short period ones are regular and the longer period ones show first relatively regular alternations in the pulsations cycles, followed by the onset of mild irregularity as in the RV Tauri stars into which they gradually morph as their periods get longer. Stellar evolution and pulsation theories suggest that these irregular stars have a much higher luminosity to mass (L/M) ratios.
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Visual light curve for RY Sagittarii, 1988–2015, showing classic behaviour for this type of variable An R Coronae Borealis variable (abbreviated RCB, R CrB) is an eruptive variable star that varies in luminosity in two modes, one low amplitude pulsation (a few tenths of a magnitude), and one irregular, unpredictably-sudden fading by 1 to 9 magnitudes. The prototype star R Coronae Borealis was discovered by the English amateur astronomer Edward Pigott in 1795, who first observed the enigmatic fadings of the star. Only about 150 RCB stars are currently known in our Galaxy while up to 1000 were expected, making this class a very rare kind of star. It is increasingly suspected that R Coronae Borealis (RCB) stars – rare hydrogen-deficient and carbon-rich supergiant stars – are the product of mergers of white-dwarfs in the intermediary mass regime (total mass between 0.6 and 1.2 ).
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Mongolian folk long song embraces a comprehensive nature of all national traditions and customs, including history, culture, aesthetics, ethics and philosophy. The main feature of the long song is the shuranhai (prolonged, tenuto notes with deeply modulated vibrato on the vowels). The Mongol aizam long songs are ancient grand songs that possess extensively broad vocal diapason and diverse vocal movement techniques, elaborate singing elements and vocal improvisations such as dan (single) and davkhar (double) shurankhai (tenuto notes with deeply modulated vibrato on the vowels), nugalaa (sharp notes modulated in lower pitch), various vocal ‘soothing’ long-drawns, upward and downward usrelt (tone leaps or sudden transmission to higher or lower tones), tsokhilgo (vocal modulated pulsation), tsatslaga (sprinkling), khayalga (bestrewing or free improvised tone), shigshree (sifting or repeated vocal vibration) and other unique singing techniques.'Sunny Mongolia today' International magazine for Mongolian railway passengers, Issue #17. p.64-65.
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When the pulsation mechanisms of the δ Scuti stars and the similar but hotter Slowly pulsating B-type (SPB) stars were identified, it became apparent that γ Coronae Borealis and a handful of similar low amplitude variable stars such as γ Ursae Minoris and Maia fell between those two classes in a region with no known driver for pulsations. The Maia variable class was named for these stars. Ironically, Maia itself has been shown not to be variable, and a number of other reported members of the class have been shown to be variables of other types, so the Maia variables appear to be very rare if they are even a real variable class. However, satellite observations have discovered a number of small-amplitude variables between the SPB and δ Scuti instability regions as well as a number of candidates in the open clusters NGC 3766 and NGC 1893.
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Such are the reasons why a physician ought to try to discover the hidden causes of diseases. As for the evident causes, which are such as can easily be discovered by anybody, and where one has only to know if the illness proceeds from heat or from cold, from having eaten too little or too much, etc., they said it was necessary to inform one's self of all of that, make on it the suitable reflections; but they did not think that one ought to stop there without going any further. They said also, in regard to the natural actions, that it was necessary to know wherefore and in what manner we receive the air into our lungs, and why we afterward expire it; why food is taken into the body, how it is there prepared, and then distributed through every part of it; why the arteries are subject to pulsation; what is the cause of sleep, wakefulness, etc.
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"Born alive" is defined as the complete expulsion of an infant at any stage of development that has a heartbeat, pulsation of the umbilical cord, breath, or voluntary muscle movement, no matter if the umbilical cord has been cut or if the expulsion of the infant was natural, induced labor, cesarean section, or induced abortion. On October 2, 2003, with a vote of 281-142, the House approved the Partial-Birth Abortion Ban Act to ban partial-birth abortion, with an exemption in cases of fatal threats to the woman. Through this legislation, a doctor could face up to two years in prison and civil lawsuits for performing such a procedure. A woman undergoing the procedure could not be prosecuted under the measure. On October 21, 2003, the United States Senate passed the bill by a vote of 64-34, with a number of Democrats joining in support. The bill was signed by President George W. Bush on November 5, 2003, but a federal judge blocked its enforcement in several states just a few hours after it became public law.
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The pulsation modes of the pre-white dwarf PG 1159-035, Costa, J. E. S.; Kepler, S. O.; Winget, D. E.; O'Brien, M. S.; Kawaler, S. D.; Costa, A. F. M.; Giovannini, O.; Kanaan, A.; Mukadam, A. S.; Mullally, F.; Nitta, A.; Provençal, J. L.; Shipman, H.; Wood, M. A.; Ahrens, T. J.; Grauer, A.; Kilic, M.; Bradley, P. A.; Sekiguchi, K.; Crowe, R.; Jiang, X. J.; Sullivan, D.; Sullivan, T.; Rosen, R.; Clemens, J. C.; Janulis, R.; O'Donoghue, D.; Ogloza, W.; Baran, A.; Silvotti, R.; Marinoni, S.; Vauclair, G.; Dolez, N.; Chevreton, M.; Dreizler, S.; Schuh, S.; Deetjen, J.; Nagel, T.; Solheim, J.-E.; Gonzalez Perez, J. M.; Ulla, A.; Barstow, M.; Burleigh, M.; Good, S.; Metcalfe, T. S.; Kim, S.-L.; Lee, H.; Sergeev, A.; Akan, M. C.; Çakırlı, Ö.; Paparo, M.; Viraghalmy, G.; Ashoka, B. N.; Handler, G.; Hürkal, Ö.; Johannessen, F.; Kleinman, S. J.; Kalytis, R.; Krzesinski, J.; Klumpe, E.; Larrison, J.; Lawrence, T.; Meištas, E.; Martinez, P.; Nather, R. E.; Fu, J.-N.
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Locksley Hall was parodied, not without beauty, to the foxhunter at least, by the Victorian English foxhunting MP William Bromley Davenport (1821–1884) in his poem "Lowesby Hall", named after a famous hunting seat in Leicestershire, the pre-eminent fox-hunting county. It describes the revived emotion in a jaded and spend-thrift city MP as he recalls the excitement of his youth foxhunting in Leicestershire, and foresees the end of his Victorian aristocratic society: :Can I but regain my credit can I spend spent cash again :Hide me from my deep emotion O thou wonderful champagne :Make me feel the wild pulsation I have often felt before :When my horse went on before me and my hack was at the door later: :Saw the landlords yield their acres after centuries of wrongs :To the Cotton Lords to whom it's proved all property belongs :Queen Religion State abandoned and all flags of party furled :In the government of Cobden and the dotage of the world.Poems of the Chase, collected and recollected by Sir Reginald Graham, Bart. London, 1912.
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A second investigation – perhaps his most famous – was on the glycogenic function of the liver; in the course of his study he was led to the conclusion, which throws light on the causation of diabetes mellitus, that the liver, in addition to secreting bile, is the seat of an internal secretion, by which it prepares sugar at the expense of the elements of the blood passing through it. A third research resulted in the discovery of the vasomotor system. In 1851, while examining the effects produced in the temperature of various parts of the body by section of the nerve or nerves belonging to them, he noticed that division of the cervical sympathetic nerve gave rise to more active circulation and more forcible pulsation of the arteries in certain parts of the head, and a few months afterwards he observed that electrical excitation of the upper portion of the divided nerve had the contrary effect. In this way he established the existence of vasomotor nerves, both vasodilator and vasoconstrictor.
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112–114 He describes Southern Athabascan music, that of the Apache and Navajo, as the simplest next to the Great Basin style, featuring strophic form, tense vocals using pulsation and falsetto, tritonic and tetratonic scales in triad formation, simple rhythms and values of limited duration (usually only two per song), arc-type melodic contours, and large melodic intervals with a predominance of major and minor thirds and perfect fourths and fifths with octave leaps not rare. Peyote songs share characteristics of Apache music and Plains-Pueblo music having been promoted among the Plains by the Apache people. He describes the structural characteristics of California-Yuman music, including that of Pomo, Miwak, Luiseno, Catalineno, and Gabrielino, and the Yuman tribes, including, Mohave, Yuman, Havasupai, Maricopa, as using the rise in almost all songs, a relaxed nonpulsating vocal technique (like European classical music), a relatively large amount of isorhythmic material, some isorhythmic tendencies, simple rhythms, pentatonic scales without semitones, an average melodic range of an octave, sequence, and syncopated figures such as a sixteenth-note, eight-note, sixteenth-note figure. The form of rise used varies throughout the area, usually being rhythmically related to the preceding non-rise section but differing in melodic material or pitch.
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