Detail of radio frequency wave generator used for dissociating chlorine molecules.
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They interpret the difference in frequency as if it were a low-frequency wave.
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Synthetic aperture radar (SAR), ground-penetrating radar (GPR), and frequency-wave number migration algorithm are some of the most popular qualitative microwave imaging methods[1].
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When the amplitude of a radio frequency wave is varied in amplitude in a manner which follows the modulating signal, usually voice, video or data, we have Amplitude modulation (AM).
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Digital television standards and their adoption worldwide In a broadcast system, the central high-powered broadcast tower transmits a high-frequency electromagnetic wave to numerous low-powered receivers. The high-frequency wave sent by the tower is modulated with a signal containing visual or audio information. The receiver is then tuned so as to pick up the high-frequency wave and a demodulator is used to retrieve the signal containing the visual or audio information. The broadcast signal can be either analog (signal is varied continuously with respect to the information) or digital (information is encoded as a set of discrete values).
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Godyak is a fellow of the American Physical Society and the IEEE. In 2004, he received the James Clerk Maxwell Prize for Plasma Physics with Noah Hershkowitz for "fundamental contributions to the physics of low temperature plasmas, including radio frequency wave heating, sheath physics, potential profiles, diagnostic probes, and the industrial applications of plasmas".
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This enables proper assessment of flicker occurring at low repetition frequencies. NOTE - Several alternative metrics such as Modulation Depth, Flicker Percentage or Flicker Index are being applied. None of these metrics are suitable to predict actual human perception because human perception is impacted by modulation depth, modulation frequency, wave shape and if applicable the duty cycle of the TLM.
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NOTE – Several alternative metrics such as Modulation Depth, Flicker Percentage or Flicker Index are being applied for specifying the stroboscopic effect performance of lighting equipment. None of these metrics are suitable to predict actual human perception because human perception is impacted by modulation depth, modulation frequency, wave shape and if applicable the duty cycle of the TLM.
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Noah Hershkowitz (born August 16, 1941) is an American experimental plasma physicist. He was jointly awarded the 2004 James Clerk Maxwell Prize for Plasma Physics with Valery Godyak for his research on low-temperature plasmas. These include radio frequency wave heating, sheath physics, potential profiles, diagnostic probes, and the industrial applications of plasmas. He is also known to have worked on magnetic confinement fusion (i.e.
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Simply stated in terms of the material of greatest engineering significance, most of the high-frequency wave energy that propagates long distances in steel plates is traveling at 3000–3300 m/s. Particle motion in the Lamb wave modes is in general elliptical, having components both perpendicular to and parallel to the plane of the plate. These components are in quadrature, i.e. they have a 90° phase difference.
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It has 4 binding sites, corresponding to the 4 sub-units. The molecular weight is 104-112kDa and the isoelectric point (pI) is in the range of 4.5-5.5. Concanavalin A has a low-frequency wave number of 20 cm−1 in its Raman spectra. This emission has been assigned to the breathing motion of the beta barrel consisting of 14 beta-strands in the concanavalin A molecule.
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Measurement of AoA can be done by determining the direction of propagation of a radio- frequency wave incident on an antenna array or determined from maximum signal strength during antenna rotation. The AoA can be calculated by measuring the time difference of arrival (TDOA) between individual elements of the array. Generally this TDOA measurement is made by measuring the difference in received phase at each element in the antenna array. This can be thought of as beamforming in reverse.
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Extracted electron beam suffers from its own space-charge fields that deteriorate the beam brightness. For that reason, photoelectron guns often have one or more full-size booster cells to increase the beam energy and reduce the space-charge effect. The gun's accelerating field is RF (radio-frequency) wave provided by a klystron or other RF power source. For low-energy beams, such as ones used in electron diffraction and microscopy, electrostatic acceleration (DC) is a suitable.
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Figure 1: The amplitude of a single frequency wave as a function of time t (red) and a copy of the same wave delayed by τ (blue). The coherence time of the wave is infinite since it is perfectly correlated with itself for all delays τ. Figure 2: The amplitude of a wave whose phase drifts significantly in time τc as a function of time t (red) and a copy of the same wave delayed by 2τc(green). At any particular time t the wave can interfere perfectly with its delayed copy.
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To transmit a high frequency wave, air must move back and forth very quickly. Short-wavelength high-pitched sound waves are reflected and refracted by many separated water droplets, partially cancelling and dissipating their energy (a process called "damping"). In contrast, low pitched notes, with a low frequency and a long wavelength, move the air less rapidly and less often, and lose less energy to interactions with small water droplets. Low-pitched notes are less affected by fog and travel further, which is why foghorns use a low-pitched tone.
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The awards Ying has received include a Sloan Fellowship in 2007, an NSF Career Award in 2009, the James H. Wilkinson Prize in Numerical Analysis and Scientific Computing in 2013 (for "his outstanding contributions in many areas, including the rapid evaluation of oscillatory integral transforms, high frequency wave propagation and the computation of electron structure in metallic systems"),"Awards Spotlight: Lexing Ying, Wilkinson Prize in Numerical Analysis and Scientific Computing", SIAM,7 October 2016. and a silver Morningside Medal in 2016."Lexing Ying, professor of mathematics, awarded James H. Wilkinson Prize", Stanford Daily, 28 July 2013.
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A halo antenna is distinct from the small-loop antenna in size, radiation pattern, and radiation resistance, or efficiency. Halos are customarily operated with the plane of the loop oriented horizontally, parallel to the ground, whereas small-loop antennas often are oriented vertically. A small-loop antenna designed for transmitting is usually about half the size of a halo built for the same frequency – wave in circumference, or a bit smaller. A small-loop can be at most a little less than wave in circumference, or of the size of a halo, and becomes increasingly difficult to tune as it approaches that maximum.
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Both conditions present with altered low- frequency brain wave oscillations. Altered brain waves from PTSD patients present with decreases in low-frequency oscillations, whereas, mTBI injuries are linked to increased low-frequency wave oscillations. Effective EEG diagnostics can help doctors accurately identify conditions and appropriately treat injuries in order to mitigate long-term effects. Traditionally, clinical evaluation of EEGs involved visual inspection. Instead of a visual assessment of brain wave oscillation topography, quantitative electroencephalography (qEEG), computerized algorithmic methodologies, analyzes a specific region of the brain and transforms the data into a meaningful “power spectrum” of the area.
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Horn-loaded woofer showing a phase plug in black Phase plugs may be placed in front of woofer cones, especially in horn-loaded loudspeaker designs. In the same fashion as compression driver phase plugs, the intent is to minimize higher-frequency wave interference near the driver. In this case, "high frequency" is relative to the intended bandpass; for example, a cone woofer might be expected to reproduce 550 Hz energy near the top of its intended range, however, the wavelength of 550 Hz is approximately twice the diameter of the woofer, so wave energy at that frequency traveling laterally from one side to the other will be out of phase and will cancel. With a phase plug in the center, such lateral wave energy bounces off of the obstruction and is reflected outward toward the listener.
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The high level of attenuation within the infrasonic bandwidth (below 10 Hz) of the seismic field observed in natural oil-saturated porous media during the last years (explained by mesoscopic homogeneous models) is the main responsible of the passive seismic wave field shifting within a low frequency range. Pressure differences between regions with different fluid/solid properties induce frequency-dependency of the attenuation (Qp and Qs reservoir factors) and velocity dispersion (Vp, Vs) of the low frequency wave field. Infrasonic passive seismic spectroscopy quantifies the absorption and the wave field dispersion within the low frequency bandwidth giving the most predominant areas linked with possible oil-saturated and porous media. The low frequency seismic field is not usually reachable by the active seismic surveys being either the explosive waves mainly in the high frequency and the vibroseis currently built not to reach such a low frequencies.
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