ARTS/ARTIFACTS; Trivia Long Ago, Serious Treasures Now. The New York Times. June 11, 1995. This ring was a miniature spinthariscope that actually had a small amount of polonium-210 in it, which emitted alpha particles to produce scintillations on the zinc sulfide outer part of the ring.
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11 June 1995. The ring contained a spinthariscope, so that when the red base (which served as a "secret message compartment") was taken off, and after a period of time for dark adaptation, you could look through a small plastic lens at scintillations caused by polonium alpha particles striking a zinc sulfide screen.
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The subjects are injected with special radionuclides which irradiate in the gamma range inside the region of interest, such as the heart or the brain. A special type of gamma camera is the SPECT (Single Photon Emission Computed Tomography). Another medical scintillography technique, the Positron-emission tomography (PET), which uses the scintillations provoked by electron-positron annihilation phenomena.
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Schilling 2002, p. 123 Throughout the month of May the radio scintillations became less noticeable until they ceased altogether. This implies that the radio source significantly expanded in the time that had passed since the burst was detected. Using the known distance to the source and the elapsed time before the scintillation ended, Frail calculated that the radio source had expanded at almost the speed of light.
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In atmospheric optics, a photometeor is a bright object or other optical phenomenon appearing in the Earth's atmosphere when sunlight or moonlight creates a reflection, refraction, diffraction or interference under particular circumstances. The most common examples include halos, rainbows, fogbows, cloud iridescences (or irisation), glories, Bishop's rings, coronas, crepuscular rays, sun dogs, light pillars, mirages, scintillations, and green flashes. Photometeors are not reported in routine weather observation.
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Other photopolarimetric observations estimated the size of the main dust particles to be 0.1 to 0.5 μm. The cyanide and diatomic carbon had polarisation close to the predicted one, but the triatomic carbon had lower polarisation than the predicted one. On May 13, 1990, as the tail of comet Austin passed in front of the quasar 3C 441, it enhanced the scintillations in radio waves.
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He made observations with the GMRT of the emission and absorption of atomic hydrogen from objects in the early Universe. Along with S.K. Sirothia, he investigated deficiency of radio sources at 327 MHz towards the prominent cold spot of the cosmic microwave background radiation. To summarise, he made important contributions in areas such as solar radio emission, interplanetary scintillations, pulsars, radio galaxies, quasars and cosmology. He published over 125 research papers and edited 4 books.
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The first device which used a scintillator was built in 1903 by Sir William Crookes and used a ZnS screen. The scintillations produced by the screen were visible to the naked eye if viewed by a microscope in a darkened room; the device was known as a spinthariscope. The technique led to a number of important discoveries but was obviously tedious. Scintillators gained additional attention in 1944, when Curran and Baker replaced the naked eye measurement with the newly developed PMT.
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Hewish attended King's College, Taunton. His undergraduate degree at Gonville and Caius College, Cambridge, was interrupted by war service at the Royal Aircraft Establishment, and at the Telecommunications Research Establishment where he worked with Martin Ryle. Returning to Cambridge in 1946, Hewish completed his degree and immediately joined Ryle's research team at the Cavendish Laboratory, obtaining his PhD in 1952. Hewish made both practical and theoretical advances in the observation and exploitation of the apparent scintillations of radio sources due to their radiation impinging upon plasma.
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It also saw the creation of open innovation platform called Prayaas to try come up with implementable solutions to problems existing in rural India. Techfest 2009-2010 added a new segment to their festival called Scintillations. The segment consisted of night exhibitions and thrilling interactive shows. The exhibitions had quite a nationalistic flavor with hangar space devoted to ISRO, Indian Navy and National Disaster Management Authority . Techfest 2010-2011 added more entertainment events to the festival with a new section called Crossroads which featured Street Magic Shows, Stunt Shows etc.
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150, 1958, S. 447–455, Destriau worked in the field of magnetism and X-ray dosimetry of ionizing radiation. Most well-known is his research on electroluminescence, which he carried out in 1935 in the Paris laboratory of the Marie Curie, who died two years earlier. Destriau observed that zinc sulfide crystals would fluoresce when doped with traces of copper ions and suspended in castor oil between two Mica platelets and applying a strong alternating electric field.G. Destriau: Recherches sur les scintillations des sulfures de zinc aux rayons.
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C/NOFS, or Communications/Navigation Outage Forecasting System was an American satellite developed by the Air Force Research Laboratory Space Vehicles Directorate to investigate and forecast scintillations in the Earth's ionosphere. It was launched by an Orbital Sciences Corporation Pegasus-XL rocket at 17:01 GMT on 16 April 2008. It decayed on 28 November 2015. The satellite, which was operated by the USAF STP, allowed the US military to predict the effects of ionospheric activity on signals from communication and navigation satellites, outages of which could potentially cause problems in battlefield situations.
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The range of physical procedures to which the mathematics of quantum measurement can be applied is very broad. In the early years of the subject, laboratory procedures involved the recording of spectral lines, the darkening of photographic film, the observation of scintillations, finding tracks in cloud chambers, and hearing clicks from Geiger counters. Language from this era persists, such as the description of measurement outcomes in the abstract as "detector clicks". In 1974, the Italian physicists Pier Giorgio Merli, Gian Franco Missiroli, and Giulio Pozzi implemented the double-slit experiment, a prototypical illustration of quantum interference, using single electrons and a television tube.
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Like other deepwater fish, Opisthoproctus soleatus needs to find its prey in a very poorly-lit environment, and avoid being detected itself by a larger predatory species. Fishes with large upward- facing eyes likely hunt by detecting the silhouettes of prey above them in contrast to the low amounts of light coming in. At the depths at which this fish lives, light is still directional, and many fish species have photophores (luminous organs) on their underside which provide them with camouflage by replicating the scintillations on the surface of the water above. O. soleatus does not have photophores, but instead has a luminous organ inside its anus.
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From 1948 to 1981 Aarons worked as a senior scientist at the Air Force Geophysics Research Laboratory at Hanscom Field, where his research helped to improve satellite and global positioning technology. Sunanda Basu of the National Science Foundation described Aarons as "a pioneer in beacon satellite studies of the ionosphere" whose name "has now become synonymous with the field of ionospheric scintillations." Having worked with many European scientists while studying in Paris, in 1957 he formed the Joint Satellite Studies Group, an international group of scientists who studied atmospheric effects on satellite signals. This group eventually expanded to become the Beacon Satellite Studies (BSS) Group, which still holds biannual meetings around the world.
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While observing the apparently uniform fluorescence on a zinc sulfide screen created by the radioactive emissions (mostly alpha radiation) of a sample of radium bromide, he spilled some of the sample, and, owing to its extreme rarity and cost, he was eager to find and recover it. Upon inspecting the zinc sulfide screen under a microscope, he noticed separate flashes of light created by individual alpha particle collisions with the screen. Crookes took his discovery a step further and invented a device specifically intended to view these scintillations. It consisted of a small screen coated with zinc sulfide affixed to the end of a tube, with a tiny amount of radium salt suspended a short distance from the screen and a lens on the other end of the tube for viewing the screen.
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From July 6, 1881, until approximately August 1882, Mayon underwent a strong (VEI=3) eruption. Samuel Kneeland, a naturalist, professor and geologist, personally observed the volcanic activity on Christmas Day, 1881, about five months after the start of the activity: > At the date of my visit, the volcano had poured out, for five months > continuously, a stream of lava on the Legaspi side from the very summit. The > viscid mass bubbled quietly but grandly, and overran the border of the > crater, descending several hundred feet in a glowing wave, like red-hot > iron. Gradually, fading as the upper surface cooled, it changed to a > thousand sparkling rills among the crevices, and, as it passed beyond the > line of complete vision behind the woods near the base, the fires twinkled > like stars or the scintillations of a dying conflagration.
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The National Centre for Radio Astrophysics (NCRA) (Hindi:राष्ट्रीय रेडियो खगोल भौतिकी केन्द्र) of India is a premier research institution in India in the field of radio astronomy is located in the Pune University Campus (just beside IUCAA), is part of the Tata Institute of Fundamental Research, Mumbai, India. NCRA has an active research program in many areas of Astronomy and Astrophysics, which includes studies of the Sun, Interplanetary scintillations, pulsars, the Interstellar medium, Active galaxies and cosmology and particularly in the specialized field of Radio Astronomy and Radio instrumentation. NCRA also provides exciting opportunities and challenges in engineering fields such as Analog and Digital Electronics, Signal Processing, Antenna Design, Communication and Software Development. NCRA has set up the Giant Metrewave Radio Telescope (GMRT), the world's largest telescope operating at meter wavelengths located at Khodad, 80 km from Pune.
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