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  • Inorganic Chemistry  (3,506)
  • ASTROPHYSICS  (2,970)
  • METEOROLOGY AND CLIMATOLOGY  (1,773)
  • 1980-1984  (8,249)
Collection
Keywords
Publisher
Years
Year
  • 1
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    Results on the verification of satellite data based on a comparison with radiosonde data (1982)
    In:  CASI
    Details
    Publication Date: 2019-08-28
    Description: Results of the verification of satellite wind data are represented by comparing them with radiosonde data for the geostationary satellites METEOSAT, GOES and GMS. The quality of METEOSAT pictures improved, reaching the quality of GOES and GMT wind data.
    Keywords: METEOROLOGY AND CLIMATOLOGY
    Type: NASA-TM-76691 , NAS 1.15:76691
    Format: application/pdf
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  • 2
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    Calculation of the attenuation and phase displacement per unit of length due to rain composed of ellipsoidal drops (1981)
    In:  CASI
    Details
    Publication Date: 2019-08-28
    Description: All of the phenomena which influence the propagation of radiowaves at frequencies above 10 GHz (attenuation, depolarization, scintillation) can by intensified by parameters directly derived from a solution of individual scatter, naturally in addition to be meteorological elements which characterize the physical medium. The diffusion caused by rainy precipitation was studied using Mie's algorithm for rain composed of spherical drops, and Oguchi's algorithm for rain composed of drops in an ellipsoidal form with axes of rotational symmetry arrange along the vertical line of a generic reference point. Specific phase displacement and attenuation along the principal planes, propagation of radiowaves in generic polarization, and propagation with inclined axes are also considered.
    Keywords: METEOROLOGY AND CLIMATOLOGY
    Type: NASA-TM-76592 , RIF-1B1778
    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
    Publication Date: 2019-08-28
    Description: 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.
    Keywords: ASTROPHYSICS
    Type: Astrophysical Journal; vol. 241
    Format: text
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  • 4
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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
    Publication Date: 2019-08-28
    Description: 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).
    Keywords: ASTROPHYSICS
    Type: NASA-TM-76237
    Format: application/pdf
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  • 5
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    Space superbubble 1200 light years across (1980)
    In:  CASI
    Details
    Publication Date: 2019-08-28
    Keywords: ASTROPHYSICS
    Type: NASA-NEWS-RELEASE-80-3 , P80-10003
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  • 6
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    Nature of type 1 Supernovae (1980)
    In:  CASI
    Details
    Publication Date: 2019-08-28
    Description: 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.
    Keywords: ASTROPHYSICS
    Type: NASA-TM-76238 , PR-395
    Format: application/pdf
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  • 7
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    The evolution of massive stars (1982)
    In:  Other Sources
    Details
    Publication Date: 2019-08-28
    Description: The hypotheses underlying theoretical studies of the evolution of massive model stars with and without mass loss are summarized. The evolutionary tracks followed by the models across theoretical Hertzsprung-Russell (HR) diagrams are compared with the observed distribution of B stars in an HR diagram. The pulsational properties of models of massive star are also described.
    Keywords: ASTROPHYSICS
    Type: B Stars With and Without Emission Lines, Parts 1 and 2; p 199-229
    Format: text
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  • 8
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    Applications of the space perspective to aviation (1983)
    In:  CASI
    Details
    Publication Date: 2019-08-28
    Description: A brief history of weather forecasting was presented starting in the seventeen hundreds with George Hadley to modern day satellite applications.
    Keywords: METEOROLOGY AND CLIMATOLOGY
    Type: NASA. Marshall Space Flight Center Proc.: 6th Ann. Workshop on Meteorol. and Environ. Inputs to Aviation Systems; p 34-36
    Format: text
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  • 9
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    NASA sounding rockets to study eclipse (1980)
    In:  CASI
    Details
    Publication Date: 2019-08-28
    Keywords: ASTROPHYSICS
    Type: NASA-NEWS-RELEASE-80-24 , P80-10023
    Format: application/pdf
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  • 10
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    Long Periodic Terms in the Solar System (1982)
    In:  CASI
    Details
    Publication Date: 2019-08-28
    Description: The long period variations of the first eight planets in the solar system are studied. First, the Lagrangian solution is calculated and then the long period terms with fourth order eccentricities and inclinations are introduced into the perturbation function. A second approximation was made taking into account the short period terms' contribution, namely the perturbations of first order with respect to the masses. Special attention was paid to the determination of the integration constants. The relative importance of the different contributions is shown. It is useless, for example, to introduce the long period terms of fifth order if no account has been taken of the short period terms. Meanwhile, the terms that have been neglected would not introduce large changes in the integration constants. Even so, the calculation should be repeated with higher order short period terms and fifth order long periods.
    Keywords: ASTROPHYSICS
    Type: NASA-TM-76994 , NAS 1.15:76994
    Format: application/pdf
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