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  • 11
    Electronic Resource
    Electronic Resource
    γ-Ray observations of Cygnus X-3 at energies of 10 12 eV (1981)
    [s.l.] : Nature Publishing Group
    Nature 289 (1981), S. 568-569 
    Details
    ISSN: 1476-4687
    Source: Nature Archives 1869 - 2009
    Topics: Biology , Chemistry and Pharmacology , Medicine , Natural Sciences in General , Physics
    Notes: [Auszug] The Crimean group found a periodic signal with the same 4.8-h period as the X rays, and having two peaks: a narrow main one centred at 0.18 periods after X-ray minimum, and a broader interpulse at 0.7-0.8 periods after X-ray minimum. They have also reported a sporadic non-periodic effect. Recently ...
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1038/289568a0
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  • 12
    Electronic Resource
    Electronic Resource
    Upper limits for γ -ray bursts from primordial black holes (1979)
    [s.l.] : Nature Publishing Group
    Nature 277 (1979), S. 199-199 
    Details
    ISSN: 1476-4687
    Source: Nature Archives 1869 - 2009
    Topics: Biology , Chemistry and Pharmacology , Medicine , Natural Sciences in General , Physics
    Notes: [Auszug] In the first data set the Mt Hopkins 10-m reflector4 was used with a field of view of 1. Approximately 112 h of observation were analysed. As the detector has an energy threshold of 1011 eV it will respond to 5 x 1012eV primaries over a large area. Events were recorded on analogue magnetic tapes ...
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1038/277199a0
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  • 13
    Electronic Resource
    Electronic Resource
    Optical pulses from primordial black hole explosions (1977)
    [s.l.] : Nature Publishing Group
    Nature 267 (1977), S. 500-501 
    Details
    ISSN: 1476-4687
    Source: Nature Archives 1869 - 2009
    Topics: Biology , Chemistry and Pharmacology , Medicine , Natural Sciences in General , Physics
    Notes: [Auszug] For a lower value of 7t, corresponding to the nuclear model of Hagedorn4, optical emission will be produced, but it will be incoherent, and the fraction of the total energy appearing is small. A limit has 'been set for 7 rays for this model, using the atmospheric Cerenkov technique, by Porter ...
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1038/267500a0
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  • 14
    Electronic Resource
    Electronic Resource
    Radio Pulses from Extensive Cosmic-Ray Air Showers (1965)
    [s.l.] : Nature Publishing Group
    Nature 205 (1965), S. 327-328 
    Details
    ISSN: 1476-4687
    Source: Nature Archives 1869 - 2009
    Topics: Biology , Chemistry and Pharmacology , Medicine , Natural Sciences in General , Physics
    Notes: [Auszug] VARIOUS proposals have been considered for the detection of large cosmic-ray air showers by radio techniques. Neither the original proposal of pulse radar1 nor the passive detection of ?erenkov radiation at microwave frequencies2 now appears to be feasible. A reassessment of the possibilities of ...
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1038/205327a0
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  • 15
    Electronic Resource
    Electronic Resource
    A high resolution imaging detector for TeV gamma-ray astronomy (1990)
    Springer
    Experimental astronomy 1 (1990), S. 173-193 
    Details
    ISSN: 1572-9508
    Source: Springer Online Journal Archives 1860-2000
    Topics: Physics
    Notes: Abstract Details are presented of an atmospheric Cherenkov telescope for use in very high energy gamma-ray astronomy which consists of a cluster of 109 close-packed photomultiplier tubes at the focus of a 10 meter optical reflector. The images of the Cherenkov flashes generated both by gamma-ray and charged cosmic-ray events are digitized and recorded. Subsequent off-line analysis of the images improves the significance of the signal to noise ratio by a factor of 10 compared with non-imaging techniques.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1007/BF00462039
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  • 16
    Electronic Resource
    Electronic Resource
    Instrumentation for very high energy gamma-ray astronomy (1995)
    Springer
    Experimental astronomy 6 (1995), S. 7-42 
    Details
    ISSN: 1572-9508
    Keywords: Gamma-ray Astronomy ; Atmospheric Cherenkov Technique
    Source: Springer Online Journal Archives 1860-2000
    Topics: Physics
    Notes: Abstract Considerable progress has been made in the last half-decade in the field of very high energy (VHE) gamma-ray astronomy (photons with energies between 1011 and 1013 eV). The high background level due to the isotropic cosmic ray flux which has bedevilled the field since its inception in the early 1960's can now be reduced to such a degree that significant gamma-ray signals from several sources become visible within a few hours of observation. The instrumentation and methodologies which have made this possible are reviewed. A brief historical introduction is followed by a summary of the salient properties of the atmospheric Cherenkov flash associated with VHE gamma-ray events. The major components of a VHE gamma-ray astronomy telescope are then reviewed. This is followed by a discussion of the different methodologies currently being used to discriminate against the cosmic ray background. Properties of several specific installations are then summarized, and possible future developments in VHE instrumentation are briefly discussed.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1007/BF00421124
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  • 17
    Electronic Resource
    Electronic Resource
    Insulin and myoelectric activity of the small intestine of the pig (1981)
    Springer
    Digestive diseases and sciences 26 (1981), S. 33-41 
    Details
    ISSN: 1573-2568
    Source: Springer Online Journal Archives 1860-2000
    Topics: Medicine
    Notes: Abstract The effect of insulin on the myoelectric activity of the small intestine was determined in conscious pigs. Animals were implanted with electrodes along the small intestine, a strain gage on the stomach and catheters in both saphenous arteries. Feeding modified the migrating myoelectric complex (MMC), a cyclic pattern of action potential activity of the small intestine characteristic of fasting. The first period of regular spiking activity (RSA) on the duodenum after feeding was delayed and was not followed by quiescence. Plasma insulin and glucose concentrations during the first three MMC after feeding were highest just before periods of duodenal RSA. Injection or infusion of insulin into fasted pigs with production of hypoglycemia caused disruption of stomach motility and duodenal electrical activity. The duodenal MMC was not altered when glucose to prevent hypoglycemia was infused together with insulin or when glucose was infused alone. These studies suggest that insulin is not directly responsible for the postprandial modification of MMC activity as insulin infusions only modify the MMC when hypoglycemia occurs.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1007/BF01307973
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