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  • 1
    Electronic Resource
    Electronic Resource
    A nonrandom component in cosmic rays of energy ≥ 10 14 eV (1980)
    [s.l.] : Nature Publishing Group
    Nature 288 (1980), S. 146-149 
    Details
    ISSN: 1476-4687
    Source: Nature Archives 1869 - 2009
    Topics: Biology , Chemistry and Pharmacology , Medicine , Natural Sciences in General , Physics
    Notes: [Auszug] The light pulses were detected at Gulmarg (altitude 2,743 m), India, on clear moonless nights, by two, coincidently operating wide-angle photomultipliers (EMI 9545 B ; viewing angle with respect to zenith, 50). Each Cerenkov light pulse, identified by its characteristic shape, was recorded with its ...
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1038/288146a0
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  • 2
    Electronic Resource
    Electronic Resource
    A new upper limit on optical bursts from primordial black hole explosions (1980)
    Springer
    Astrophysics and space science 73 (1980), S. 513-516 
    Details
    ISSN: 1572-946X
    Source: Springer Online Journal Archives 1860-2000
    Topics: Physics
    Notes: Abstract Two wide-angle photomultiplier systems were simultaneously operated over a baseline of nearly 30 km in a search for cosmic optical bursts of fractional microsecond time-scale. In 74 hours of overlapping observation, one event was recorded coincident to 1 ms as against the corresponding accidental coincidence value of 0.14 from Čerenkov light pulses from unrelated cosmic ray showers. The possible cosmic origin of this event, including that from primordial black-hole explosions, is discussed and the corresponding upper limits derived.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1007/BF00642429
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  • 3
    Electronic Resource
    Electronic Resource
    Drive-Control System for the TACTIC Gamma-Ray Telescope (1999)
    Springer
    Experimental astronomy 9 (1999), S. 81-101 
    Details
    ISSN: 1572-9508
    Keywords: altitude-azimuth mounting ; gamma-ray astronomy ; TACTIC drive-control system
    Source: Springer Online Journal Archives 1860-2000
    Topics: Physics
    Notes: Abstract A PC-based drive-control system has been developed for the altitude-azimuth mounted TACTIC γ-ray telescope to control the speed and direction of motion of its 2-axes. Details of various hardware components chosen for the telescope, including hybrid-stepper motor, 16-bit absolute encoder and CAMAC-based programmable stepper motor controller, are discussed in this paper. The telescope-control strategy, based on the position-loop with a proportional type control for the source-seek mode and the on/off type control for the tracking mode, is explained in detail. Some important performance features of the telescope, including its blind-spot size, drive-system backlash and encoder-error compensation, are also presented. The drive system has been extensively field-tested and has been operating satisfactorily during observation campaigns carried out since March 1997 with the TACTIC Imaging Element. A tracking accuracy of ±3 arc-minutes has been achieved. A test report of its performance, with regard to its tracking accuracy on the basis of successful detection of TeV γ-rays from the active galaxy Markarian 501 in April–May 1997, is also presented.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1023/A:1008090931239
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  • 4
    Electronic Resource
    Electronic Resource
    A cosmic-ray explanation of the galactic ridge of cosmic X-rays (1985)
    [s.l.] : Nature Publishing Group
    Nature 318 (1985), S. 267-269 
    Details
    ISSN: 1476-4687
    Source: Nature Archives 1869 - 2009
    Topics: Biology , Chemistry and Pharmacology , Medicine , Natural Sciences in General , Physics
    Notes: [Auszug] The first report of an apparently diffuse X-ray flux from the galactic plane seems to have been by Cooke et al6 in 1969. The most recent1 work, using Exosat for two-dimensional mapping, strongly supports the existence of the ridge, and Warwick et al,1 estimate an overall galactic diffuse emission ...
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1038/318267a0
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  • 5
    Electronic Resource
    Electronic Resource
    Acceleration of cosmic rays in the Loop I ‘supernova remnant’? (1985)
    [s.l.] : Nature Publishing Group
    Nature 314 (1985), S. 515-517 
    Details
    ISSN: 1476-4687
    Source: Nature Archives 1869 - 2009
    Topics: Biology , Chemistry and Pharmacology , Medicine , Natural Sciences in General , Physics
    Notes: [Auszug] Here, we describe a study of the secondary y rays in the 100-MeV region, generated by the interactions of cosmic rays (protons of 1-lOGeV and electrons of several hundred MeV) with the ISM. It is generally considered1'2 that most of the y rays detected in the satellite experiments are, in fact, ...
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1038/314515a0
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  • 6
    Electronic Resource
    Electronic Resource
    Neutron generation in lightning bolts (1985)
    [s.l.] : Nature Publishing Group
    Nature 313 (1985), S. 773-775 
    Details
    ISSN: 1476-4687
    Source: Nature Archives 1869 - 2009
    Topics: Biology , Chemistry and Pharmacology , Medicine , Natural Sciences in General , Physics
    Notes: [Auszug] Neutrons were detected at Gulmarg (altitude 2,743 m, latitude 34.07° N, longitude 74.42° E) by a low-energy cosmic-ray neutron monitor comprising 21 enriched BF3 counters, each 90 cm long and 3.8 cm in diameter. The counters are arranged in the form of a pile and are placed over 28-cm-thick ...
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1038/313773a0
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  • 7
    Electronic Resource
    Electronic Resource
    Possible transient emission from Cygnus X-3 at TeV energies during October 1985 radio flare (1989)
    Springer
    Astrophysics and space science 151 (1989), S. 149-156 
    Details
    ISSN: 1572-946X
    Source: Springer Online Journal Archives 1860-2000
    Topics: Physics
    Notes: Abstract The Gulmarg gamma-ray telescope (threshold energy ∼6 TeV) was tracking Cygnus X-3 on four days in October 1985, around the time the source produced one of its most outstanding radio flares. Examined here is the behaviour of the event rates recorded during this period with a time-resolution of 216 s. Two episodes of higher event rates, each several minutes in duration and having a Poissonian significance of ∼4σ, were recorded on 10 and 12 October, suggesting possible activity at TeV energies during the radio flare period of Cygnus X-3.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1007/BF00643636
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  • 8
    Electronic Resource
    Electronic Resource
    A search for the millisecond pulsar in Cygnus X-3 (1994)
    Springer
    Astrophysics and space science 219 (1994), S. 221-229 
    Details
    ISSN: 1572-946X
    Source: Springer Online Journal Archives 1860-2000
    Topics: Physics
    Notes: Abstract Atmospheric Cerenkov data, recorded at Gulmarg, India, during the 2-year period 1988–1989 in the direction of Cygnus X-3, have been searched for the presence of a periodic pulsar modulation, employing both the Rayleigh power and the epoch-folding (χ 2) techniques. No evidence is found for pulsations at either ∼ 12.59 ms or ∼ 9.22 ms, the two period values around which the detection of pulsed signals has been reported by three atmospheric Cerenkov groups, but not by at least two other groups, including one using a higher-sensitivity Cerenkov imaging telescope.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1007/BF00628239
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  • 9
    Electronic Resource
    Electronic Resource
    Energy-dispersive X-ray fluorescence spectrometry technique as an efficient monitoring tool for mercury contamination (1996)
    Springer
    Environmental monitoring and assessment 41 (1996), S. 77-86 
    Details
    ISSN: 1573-2959
    Source: Springer Online Journal Archives 1860-2000
    Topics: Energy, Environment Protection, Nuclear Power Engineering
    Notes: Abstract This paper illustrates the useful early-warning role of the energy-dispersive X-ray fluorescence technique against a potential health hazard being posed by dumping effluents from an industrial unit involved in the manufacture of lead-batteries, in a nearby water-canal used for irrigation purposes by surrounding villages. These effluents were shown to contain mercury at a potentially unsafe level, resulting in timely initiation of necessary preventive measures. The standard fundamental parameter method was invoked for a quantitative estimation of the mercury (Hg) concentration. In addition, L-series (rather than the usual K-series) X-rays were used for excitation, mainly on account of the type of the available excitation source.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1007/BF00394248
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  • 10
    Electronic Resource
    Electronic Resource
    AGN Detection Ranges of MACE and TACTIC Imaging Gamma-Ray Telescopes (1998)
    Springer
    Experimental astronomy 8 (1998), S. 187-210 
    Details
    ISSN: 1572-9508
    Keywords: Active Galactic Nuclei ; BL Lacertae objects ; HE/VHE gamma-ray astronomy ; theory ; intergalactic medium ; Cerenkov imaging telescopes
    Source: Springer Online Journal Archives 1860-2000
    Topics: Physics
    Notes: Abstract Two high-sensitivity imaging gamma-ray telescopes, MACE and TACTIC, are being set up at Mt. Abu, India, for making detailed spectral and temporal investigations of galactic and extragalactic gamma-ray sources in the photon energy bands. Eγ ∼ 20–200 GeV and ∼ 0.5–5TeV respectively. Here, we estimate the effective red-shift ranges of these telescopes for detecting gamma-ray signals from the EGRET-detected AGN's and identify the most likely candidate-sources for detection by the MACE and the TACTIC, under the assumption that the EGRET-inferred power-law spectra for these AGN's extend into the GeV-TeV range without any change in shape. Extremum bounds of the relevant intergalactic background radiation fields, suggested by various observational and theoretical considerations, have been used to estimate the attenuation of VHE gamma-ray fluxes due to photon-photon pair-production process, leading to the desired z-ranges for these instruments.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1023/A:1008073009597
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