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  • 1
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    The Backup-Gilbert method and its application to the electrical conductivity problem (1972)
    In:  CASI
    Details
    Publication Date: 2006-03-12
    Description: The theory of Backus and Gilbert gives a technique for solving the general linear inverse problem. Observational error and lack of data are shown to reduce the reliability of the solution in different ways: the former introduces statistical uncertainties in the model, while the latter smooths out the detail. Precision can be improved by sacrificing resolving power, and vice versa, so that some compromise may be made between the two in choosing the best model. Nonlinear inverse problems can be brought into the domain of the theory by linearizing about a typical solution. The inverse problem of electrical conductivity in the mantle is used to illustrate the Backus-Gilbert technique; an example of the tradeoff diagram is given.
    Keywords: ELECTRONICS
    Type: NASA. Ames Res. Center Math. of Profile Inversion; 8 p
    Format: text
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    NASA TECHNICAL REPORTS
  • 2
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    Summary of scientific results (1973)
    In:  CASI
    Details
    Publication Date: 2006-01-11
    Description: The accomplishments of the Apollo 17 flight are summarized. The basic objective of the mission was to sample basin-rim highland material and adjacent mare material and to investigate the geological evolutionary relationship between these two major units. The lunar experiments which were conducted include: (1) lunar field geology, (2) surface electrical experiments, (3) lunar traverse gravimeter experiments, (4) lunar seismic profiling experiment, (5) lunar ejecta and meteorites experiment, (6) analysis of lunar atmosphere composition, and (7) heat flow experiments.
    Keywords: SPACE SCIENCES
    Type: Apollo 17 Prelim. Sci. Rept.; 7 p
    Format: text
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    NASA TECHNICAL REPORTS
  • 3
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    Water vapor in Venus determined by airborne observations of the 8200 A band (1974)
    In:  Other Sources
    Details
    Publication Date: 2019-06-27
    Description: The region of the 8200 A Band of H2O was studied in spectra of Venus obtained with an echelle grating spectrograph operated at an altitude of 14.6 km in the NASA Learjet research aircraft. Taking advantage of low foreground absorption, observing at a time of velocity quadrature, differential spectroscopy with respect to lunar spectra, and spectrum averaging, we establish a value of H2O of 3 plus or minus 20 microns for the total path over the entire disk. This value differs from earlier studies of the integrated disk but supports the low values recently derived from infrared bands and by very high spectral resolution groundbased studies.
    Keywords: SPACE SCIENCES
    Type: Icarus; 21; Mar. 197
    Format: text
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    NASA TECHNICAL REPORTS
  • 4
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    New observations of the solar ultraviolet chromosphere. (1973)
    In:  Other Sources
    Details
    Publication Date: 2019-06-27
    Description: We present some of the results of a rocket flight which obtained a stigmatic spectrum of the sun in the region 1190 to 1320A. The experiment achieved a spectral resolution of 0.01A throughout this range, and the effective angular resolution was about 20 sec. Lines which are formed in the chromosphere and transition zone show strong fluctuations with position on the disk. The correspondence between the H Lyman-alpha profile and chromospheric details seen in the Ca K-line is demonstrated.
    Keywords: SPACE SCIENCES
    Type: Astrophysical Journal; 182; May 15
    Format: text
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    NASA TECHNICAL REPORTS
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