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  • Life and Medical Sciences  (3.898)
  • LUNAR AND PLANETARY EXPLORATION  (3.213)
  • GEOPHYSICS  (3.124)
  • ASTROPHYSICS  (2.970)
  • Biochemistry and Biotechnology  (1.710)
  • 1980-1984  (14.432)
  • 1945-1949  (453)
  • 1905-1909  (30)
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  • 1
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    Voyages to Saturn (1982)
    In:  CASI
    Details
    Publikationsdatum: 2019-08-28
    Beschreibung: The Voyager mission to Saturn is explained in detail. A history of Saturn observations from ancient times to the present is given. The Voyager spacecraft and their instruments are described. An overview of planetary astronomy is presented. The text is supplemented by numerous black and white and color photographs. The Saturn satellites are discussed in detail, and preliminary pictorial maps of the satellites are given.
    Schlagwort(e): LUNAR AND PLANETARY EXPLORATION
    Materialart: NASA-SP-451 , NAS 1.21:451 , LC-81-600073
    Format: application/pdf
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  • 2
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    Studies on the behavior of ammonia and ammonium salts in the atmosphere (1) - Fractional collection of ammonia gas and particulate ammonium (1981)
    In:  CASI
    Details
    Publikationsdatum: 2019-08-28
    Beschreibung: Methods for the fractional collection of trace amounts of atmospheric ammonia gas and ammonium particles on a two staged glass fiber filter are summarized. A standard glass fiber filter washed with distilled water and dried at 120 to 130 C was used. A second filter was impregnated with a mixture of 3% boric acid and 25% glycerin solution. The blank of glass fiber filters impregnated with a mixture of the above solution was very low for ammonia, i.e. 0.06 micrograms in a filter of 47 mm in diameter. The mean concentrations of ammonia and ammonium in air at Kawasaki, a polluted area, were 7.6 and 2.3 micrograms cu m, and those at Sanriku, an unpolluted area 0.9 and 0.2 micrograms cu m, respectively. Ratios of concentration levels of ammonium to total ammonia in the atmosphere were 0.3 and 0.2 for the polluted and unpolluted areas, respectively. Ammonium salts in air at both areas were not correlated with relative humidity. Variations in time of ammonia concentrations and sources in surrounding areas are also considered.
    Schlagwort(e): GEOPHYSICS
    Materialart: NASA-TM-76582
    Format: application/pdf
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  • 3
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    The 1979 X-ray outburst of Centaurus X-4 (1980)
    In:  Other Sources
    Details
    Publikationsdatum: 2019-08-28
    Beschreibung: X-ray observations of the first major outburst of the classical transient X-ray source Centaurus X-4 since its discovery in 1969 are presented. The observations were obtained in May, 1979, with the all-sky monitor on board Ariel 5. The flare light curve is shown to exhibit many of the characteristics of other transients, including a double-peaked maximum, as well as significant, apparently random, variations and a lower peak flux and shorter duration than the 1969 event. Application of a standard epoch-folding technique to data corrected for linear decay trends indicates a possible source modulation at 0.3415 days (8.2 hours). Comparison of the results with previous other data on Cen X-4 and the characteristics of the soft X-ray transients allows a total X-ray output of approximately 3 x 10 to the 43rd ergs to be estimated, and reveals the duration and decay time of the 1979 Cen X-4 outburst to be the shortest yet observed from soft X-ray transients. The observations are explained in terms of episodic mass exchange from a late-type dwarf onto a neutron star companion in a relatively close binary system.
    Schlagwort(e): ASTROPHYSICS
    Materialart: Astrophysical Journal; vol. 241
    Format: text
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  • 4
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    The Viking seismometry (1981)
    In:  CASI
    Details
    Publikationsdatum: 2019-08-28
    Beschreibung: Efforts were made to determine the seismicity of Mars as well as define its internal structure by detecting vibrations generated by marsquakes and meteoroid impacts. The lack of marsquakes recognized in the Viking data made it impossible to make any direct inferences about the interior of Mars and only allowed the setting of upper bounds on the seismic activity of the planet. After obtaining more than 2100 hours worth of data during the quite periods at rates of one sample per second or higher, the Viking 2 seismometer was turned off as a consequence of a landing system failure. During the periods when adequate data were obtained, one event of possible seismic or meteoroid impact origin was recognized; however, there is a significant probability that this event was generated by a wind gust.
    Schlagwort(e): LUNAR AND PLANETARY EXPLORATION
    Materialart: NASA-CR-3408
    Format: application/pdf
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  • 5
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    Evaluation of orbits with incomplete knowledge of the mathematical expectancy and the matrix of covariation of errors (1980)
    In:  CASI
    Details
    Publikationsdatum: 2019-08-28
    Beschreibung: The problem of selecting the optimal algorithm of filtration and the optimal composition of the measurements is examined assuming that the precise values of the mathematical expectancy and the matrix of covariation of errors are unknown. It is demonstrated that the optimal algorithm of filtration may be utilized for making some parameters more precise (for example, the parameters of the gravitational fields) after preliminary determination of the elements of the orbit by a simpler method of processing (for example, the method of least squares).
    Schlagwort(e): ASTROPHYSICS
    Materialart: NASA-TM-76237
    Format: application/pdf
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  • 6
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    Method of determination of the mass composition of ring current ions (1980)
    In:  CASI
    Details
    Publikationsdatum: 2019-08-28
    Beschreibung: A method for individual registration of protons, and helium and oxygen ions, with energies E for a charge on the order of 100 kev/q in the ring currents of the Earth's magnetosphere was examined. The method is based on the various specific losses in energy by these ions in matter. The ion current, selected according to E/q, is passed through a solid target, after which identification of the masses is carried out, based on the energy losses in the possibly to reliably divide the flows of protons, and helium and oxygen ions.
    Schlagwort(e): GEOPHYSICS
    Materialart: NASA-TM-76246
    Format: application/pdf
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  • 7
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    Meteorite analysis assists search for life (1980)
    In:  CASI
    Details
    Publikationsdatum: 2019-08-28
    Schlagwort(e): LUNAR AND PLANETARY EXPLORATION
    Materialart: NASA-NEWS-RELEASE-80-21 , P80-10024
    Format: application/pdf
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  • 8
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    Space superbubble 1200 light years across (1980)
    In:  CASI
    Details
    Publikationsdatum: 2019-08-28
    Schlagwort(e): ASTROPHYSICS
    Materialart: NASA-NEWS-RELEASE-80-3 , P80-10003
    Format: application/pdf
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  • 9
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    The International Halley Watch (1980)
    In:  CASI
    Details
    Publikationsdatum: 2019-08-28
    Beschreibung: In preparation for the 1985 to 1986 apparition of Halley's Comet, the International Halley Watch (IHW) has initiated a comprehensive program to simulate, encourage, and coordinate scientific observation of the apparition. The observing groups with which the IHW plans to interact are discussed and the ground based observing nets are described in detail. An outline of the history of observations of Halley's Comet and a synopsis of comet properties and physics are included.
    Schlagwort(e): LUNAR AND PLANETARY EXPLORATION
    Materialart: NASA-TM-82181
    Format: application/pdf
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  • 10
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    Nature of type 1 Supernovae (1980)
    In:  CASI
    Details
    Publikationsdatum: 2019-08-28
    Beschreibung: The nature of type 1 supernovae (SN 1) is discussed through a comparison of observational evidence and theoretical perspectives relating to both type 1 and 2 supernovae. In particular two hypotheses relating to SN 1 phenomenon are examined: the first proposing that SN 1 are components of binary systems in which, at a comparatively late stage of evolution, overflow of the mass occurs; the second considers pre-SN 1 to be recently evolved stars with a mass greater than 1.4 solar mass (white dwarfs). In addition, an explanation of the reduced frequency of flares of SN 1 in spiral galaxies as related to that in elliptical galaxies is presented.
    Schlagwort(e): ASTROPHYSICS
    Materialart: NASA-TM-76238 , PR-395
    Format: application/pdf
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