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  • 1
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    Computer generated seismograms (1972)
    Academic Press
    In:  Methods in Computational Physics, New York, Academic Press, vol. 12, pp. 35-46
    Details
    Publication Date: 1972
    Keywords: Synthetic seismograms ; SEModelling ; Review article
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    BIBLIOGRAPHY SEISMOLOGY
  • 2
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    Numerical analysis of dispersed seismic waves (1972)
    Academic Press
    In:  Professional Paper, Methods of Computational Physics, New York, Academic Press, vol. 11, no. 16, pp. 1057-1064, (ISBN 1-4020-1729-4)
    Details
    Publication Date: 1972
    Keywords: Dispersion ; Surface waves ; Review article ; Data analysis / ~ processing ; Dziewonski
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    BIBLIOGRAPHY SEISMOLOGY
  • 3
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    Finite-difference methods for seismic wave propagation in heterogeneous materials (1972)
    Academic Press Inc.
    In:  Professional Paper, Methods in Computational Physics, Washington, D. C., Academic Press Inc., vol. 11, no. 16, pp. 1-37, (ISBN 0080419208)
    Details
    Publication Date: 1972
    Keywords: Finite difference method ; Review article ; Wave propagation ; Inhomogeneity
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    BIBLIOGRAPHY SEISMOLOGY
  • 4
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    ON HYDROMAGNETIC STABILITY OF STATIONARY EQUILIBRIA (1960)
    In:  Other Sources
    Details
    Publication Date: 2012-07-26
    Description: Hydromagnetic stability of fluids in static equilibrium
    Keywords: NAVIGATION
    Format: text
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    NASA TECHNICAL REPORTS
  • 5
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    Search for heavy antinuclei in the cosmic radiation (1985)
    In:  CASI
    Details
    Publication Date: 2019-06-28
    Description: The existence of significant amounts of antimatter in the Universe is demonstrated through cosmic radiation. The data from the Danish-French Cosmic Ray Spectrometer on the HEAO-3 satellite offers an opportunity to search for heavy antinuclei, since all the relevant parameters (charge, velocity, arrival direction, and satellite position at the time of arrival) are measured for each recorded nucleus. Using the 22676 positive only events in the data seletion corresponding to L 1.5 as a measure of our exposure factor to heavy antinuclei and noting that no corresponding antinuclei were found, an upper limit (95% confidence) is given to the ratio of antinuclei to nuclei as 1.4 x .0001 for particles with Z 9. The upper limit resulting from this work is compared with previous results of searches for heavy antimatter in the cosmic radiation. It is seen that, if one regards only antiparticles heavier than fluorine, then the present result represents a reduced upper limit over previous data. When taken together, all the available experiment data now push the upper limit for the ratio of antiparticles to particles well below .0001.
    Keywords: SPACE RADIATION
    Type: OG-6.1-2 , 19th Intern. Cosmic Ray Conf - Vol. 2; p 330-333; NASA-CP-2376-VOL-2
    Format: application/pdf
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    NASA TECHNICAL REPORTS
  • 6
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    Analysis of the charging of the SCATHA (P78-2) satellite (1980)
    In:  CASI
    Details
    Publication Date: 2019-07-13
    Description: The charging of a large object in polar Earth orbit was investigated in order to obtain a preliminary indication of the response of the shuttle orbiter to such an environment. Two NASCAP (NASA Charging Analyzer Program) models of SCATHA (Satellite Charging at High Altitudes) were used in simulations of charging events. The properties of the satellite's constituent materials were compiled and representations of the experimentally observed plasma spectra were constructed. Actual charging events, as well as those using test environments, were simulated. Numerical models for the simulation of particle emitters and detectors were used to analyze the operation of these devices onboard SCATHA. The effect of highly charged surface regions on the charging conductivity within a photosheath was used to interpret results from the onboard electric field experiment. Shadowing calculations were carried out for the satellite and a table of effective illuminated areas was compiled.
    Keywords: LAUNCH VEHICLES AND SPACE VEHICLES
    Type: NASA-CR-165348 , SSS-R-81-4798
    Format: application/pdf
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    NASA TECHNICAL REPORTS
  • 7
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    A three dimensional dynamic study of electrostatic charging in materials (1977)
    In:  CASI
    Details
    Publication Date: 2019-07-13
    Description: A description is given of the physical models employed in the NASCAP (NASA Charging Analyzer Program) code, and several test cases are presented. NASCAP dynamically simulates the charging of an object made of conducting segments which may be entirely or partially covered with thin dielectric films. The object may be subject to either ground test or space user-specified environments. The simulation alternately treats (1) the tendency of materials to accumulate and emit charge when subject to plasma environment, and (2) the consequent response of the charged particle environment to an object's electrostatic field. Parameterized formulations of the emission properties of materials subject to bombardment by electrons, protons, and sunlight are presented. Values of the parameters are suggested for clean aluminum, Al2O3, clean magnesium, MgO, SiO2 kapton, and teflon. A discussion of conductivity in thin dielectrics subject to radiation and high fields is given, together with a sample calculation.
    Keywords: ELECTRONICS AND ELECTRICAL ENGINEERING
    Type: NASA-CR-135256 , SSS-R-77-3367
    Format: application/pdf
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    NASA TECHNICAL REPORTS
  • 8
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    Effects of bulk and surface conductivity on the potential developed by dielectrics exposed to electron beams (1979)
    In:  Other Sources
    Details
    Publication Date: 2019-06-27
    Description: The charging and discharging of a dielectric material which has bulk and surface conductivities is discussed. Two model problems are solved. In the first problem, a semi-infinite dielectric plane, attached to an infinite grounded conducting substrate and exposed to a monoenergetic electron beam, is analyzed. Bulk and surface conductivities and secondary emission characteristics are taken into account as parameters. In the second problem the dielectric is charged but the electron beam is shut off so only the bulk and surface conductivities enter the calculation. The principal result of the latter calculation is to show that steep tangential gradients develop in the presence of a surface conductivity during decay, and that for asymptotic times the temporal behavior, for a fixed position, is proportional to the square root of t rather than exponential, as expected in the presence of a bulk conductivity.
    Keywords: PHYSICS (GENERAL)
    Type: Journal of Applied Physics; 50; Sept
    Format: text
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    NASA TECHNICAL REPORTS
  • 9
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    Measurement of the Li/B abundance ratio above 650 MeV/nucleon (1978)
    In:  Other Sources
    Details
    Publication Date: 2019-07-13
    Description: A balloon-borne cosmic-ray telescope containing 4 Cerenkov counters and a neon flash tube hodoscope was flown from Sioux City, Iowa in September 1974. The data have been reanalyzed, using information of flashed tubes to reject events due to proton and He interactions. The new event selection has reduced charge overlap between He and Li to an insignificant level, so that abundance ratios involving Li can now be measured with the instrument. Precise correction factors for events lost by inefficiency of the hodoscope have been derived from flight data; they lead to improved accuracy in measurements of light elements.
    Keywords: SPACE RADIATION
    Type: International Cosmic Ray Conference; Aug 13, 1977 - Aug 26, 1977; Plovdiv; Bulgaria
    Format: text
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    NASA TECHNICAL REPORTS
  • 10
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    Extension, validation and application of the NASCAP code (1979)
    In:  CASI
    Details
    Publication Date: 2019-07-13
    Description: Numerous extensions were made in the NASCAP code. They fall into three categories: a greater range of definable objects, a more sophisticated computational model, and simplified code structure and usage. An important validation of NASCAP was performed using a new two dimensional computer code (TWOD). An interactive code (MATCHG) was written to compare material parameter inputs with charging results. The first major application of NASCAP was performed on the SCATHA satellite. Shadowing and charging calculation were completed. NASCAP was installed at the Air Force Geophysics Laboratory, where researchers plan to use it to interpret SCATHA data.
    Keywords: ELECTRONICS AND ELECTRICAL ENGINEERING
    Type: NASA-CR-159595 , SSS-R-79-3904
    Format: application/pdf
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    NASA TECHNICAL REPORTS
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