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  • 1
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    Observations of dilatancy-induced polarization anomalies and earthquake prediction (1980)
    In:  Nature, Roma, Acad. Roy. des Sciences, vol. 286, no. 1, pp. 874-877, pp. B04102, (ISBN: 0-12-018847-3)
    Details
    Publication Date: 1980
    Keywords: Earthquake precursor: prediction research ; Dual Induction Latero logAT ; AnisotropyS ; Turkey ; Uecer ; Ucer
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    BIBLIOGRAPHY SEISMOLOGY
  • 2
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    Rapid extraction of relative topography from Viking orbiter images. 2: Application to irregular topographic features (1984)
    In:  CASI
    Details
    Publication Date: 2006-04-06
    Description: The ratio and flat field photoclinometric methods for determining crater form topography are described. Both methods compensate for the effects of atmospheric scattering by subtracting a haze value from all brightness values. Algorithms were altered to derive relative topographic data for irregular features such as ejecta blankets, lava flows, graben and ridge scarps, dune forms, and stratified materials. After the elevations along the profiles are obtained by integration of the photometric function, a matrix transformation is applied to the image coordinates of each pixel within each profile, utilizing each pixel's integral height, to produce a projection of each profile line onto the surface. Pixel brightness values are then resampled along the projected track of each profile to determine a more correct height value for each pixel. Precision of the methods is discussed.
    Keywords: LUNAR AND PLANETARY EXPLORATION
    Type: NASA. Washington Rept. of Planetary Geology Program, 1983; p 263-265
    Format: text
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    NASA TECHNICAL REPORTS
  • 3
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    Characterization of surficial geologic units on Venus from Pioneer Venus radar data: A progress report (1984)
    In:  CASI
    Details
    Publication Date: 2006-04-06
    Description: A classification database using the reflectivity (derived from the altimetry data), rms slope, and the first principal component of altimetry and topographic slope is presented. The resultant clustered data is examined qualitatively as well as quantitatively, to establish the statistical integrity of each cluster by use of an interactive, ternary plotting algorithm. This algorithm plots, for a cluster, the position of each of its pixels within a ternary diagram whose apices represent reflectivity, rms slope, and the first principal component. The digital values in these three databases are normalized such that unity is represented by a value of 255 in each database. The frequencies of each plotted point within the ternary diagram are recorded in order to establish the mode of each cluster. The pixels of each cluster are displayed as one separate color; their ternary plot will show not only the interrelations between clusters, but also the presence of any anomalous points within a cluster. Existing lunar and terrestrial analog radar data is used to establish fields within this ternary diagram that are indicative of as many different geologic materials and tectonics settings as possible. The resultant fields are used to determine empirically the geologic significance of the clusters resulting from the cluster analysis.
    Keywords: LUNAR AND PLANETARY EXPLORATION
    Type: NASA. Washington Repts. of Planetary Geol. Program; p 65-66
    Format: text
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    NASA TECHNICAL REPORTS
  • 4
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    Testing of Candidate Batteries for Global Positioning System (1984)
    In:  CASI
    Details
    Publication Date: 2016-06-07
    Description: Three lithium batteries proposed as candidates for use in the Global Positioning System are studied. The batteries are discharged at several rates and temperatures both before and after environmental testing. Batteries are heated inside a closed chamber until they vent. Samples of the vented gases are analyzed for components which might be toxic. The test results raise concerns about each of the proposed batteries.
    Keywords: ELECTRONICS AND ELECTRICAL ENGINEERING
    Type: NASA. Goddard Space Flight Center The 1983 Goddard Space Flight Center Battery Workshop; p 129-137
    Format: application/pdf
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    NASA TECHNICAL REPORTS
  • 5
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    Deep-sea spherules from Pacific clay - Mass distribution and influx rate (1980)
    In:  Other Sources
    Details
    Publication Date: 2019-06-28
    Description: From 411 kg of Pacific clay, 22 mg of stony spherules and 50 mg of iron spherules larger than 150 microns were concentrated. The extraterrestrial origin of these particles was evaluated with the aid of optical and electron microscopy and atomic absorption elemental analysis. An expression for the integral number of stony particles from this sediment in the mass range 20-300 micrograms was derived. The world-wide influx rate of stony particles in the mass range which survive atmospheric heating and ocean sediment storage is calculated to be 90 tons/yr. The relative contributions of ablation debris vs fused interplanetary dust to the influx of stony spherules is discussed, but no conclusions could be made.
    Keywords: LUNAR AND PLANETARY EXPLORATION
    Type: Geochimica et Cosmochimica Acta; 44; Dec. 198
    Format: text
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    NASA TECHNICAL REPORTS
  • 6
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    Iron and titanium distribution on the moon from orbital gamma ray spectrometry with implications for crustal evolutionary models (1980)
    In:  Other Sources
    Details
    Publication Date: 2019-06-27
    Description: A set of Fe and Ti maps and regional values are obtained from the Apollo 15 and 16 orbital gamma ray data by energy band analysis. High-Ti basalts predominate the early and late stages of mare volcanism with high-Fe basaltic volcanism in the interim. The first evidence of a high-Ti-KREEP basalt association is found in the Aristarchus region. A N-S asymmetry for Fe and Ti in the east limb and farside highlands complicates the E-W asymmetry for Th but substantiates crustal inhomogeneity. The observed crustal inhomogeneity adds an additional objection to the primitive source model for crustal evolution. The high-Ti-KREEP basalt association and the general trend of decreasing mare basalt Ti with time lend support to the cumulate source model; however, this model cannot account for young, high-Ti maria. The dynamic assimilation model better accounts for chemical variations observed on the moon.
    Keywords: LUNAR AND PLANETARY EXPLORATION
    Type: Journal of Geophysical Research; 85; June 10
    Format: text
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    NASA TECHNICAL REPORTS
  • 7
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    Inelastic neutron scatter iron concentrations of the moon from orbital gamma ray data (1981)
    In:  Other Sources
    Details
    Publication Date: 2019-06-28
    Description: The considered investigation is concerned with the relation between KREEP and thermal neutron flux depression. The Fe(n, n-prime gamma) concentrations of selected lunar regions were calculated by energy-band analysis of the 0.803-0.872 MeV band. The result of the investigation will be used to evaluate the reliability of the previously determined Fe(n, gamma) values. A 0.803-0.872 MeV band was isolated from the Apollo 15 and 16 orbital gamma ray spectra. Preliminary regression analysis of regional ground truth count rates and Fe concentrations showed this energy interval to be optimum for the 0.8467 MeV inelastic scatter (n, n-prime gamma)Fe peak.
    Keywords: LUNAR AND PLANETARY EXPLORATION
    Type: Journal of Geophysical Research; 86; Dec. 10
    Format: text
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    NASA TECHNICAL REPORTS
  • 8
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    Development of a surface isolation estimation technique suitable for application of polar orbiting satellite data (1981)
    In:  CASI
    Details
    Publication Date: 2019-06-28
    Description: A technique is developed for the estimation of total daily insolation on the basis of data derivable from operational polar-orbiting satellites. Although surface insolation and meteorological observations are used in the development, the algorithm is constrained in application by the infrequent daytime polar-orbiter coverage.
    Keywords: EARTH RESOURCES AND REMOTE SENSING
    Type: E82-10122 , NASA-CR-167473 , NAS 1.26:167473 , YM-N1-04198 , JSC-17784
    Format: application/pdf
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    NASA TECHNICAL REPORTS
  • 9
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    Modeling crater topography and albedo from monoscopic Viking Orbiter images. I - Methodology (1984)
    In:  Other Sources
    Details
    Publication Date: 2019-06-28
    Description: The methodology for a new photoclinometric technique for extracting topographic data from planetary images is described. The technique fully compensates for oblique viewing geometry prevalent in many spacecraft images. Brightness data are taken from a pair of profiles simultaneously, overcoming the problem of albedo variations in the application of photoclinometry to planetary surfaces. An additional procedure is described for eliminating the requirement of topographic symmetry along a pair of profiles. Test results show that both procedures have an accuracy of about two degrees for slopes of typical bowl-shaped craters, or about 5 percent for depths.
    Keywords: LUNAR AND PLANETARY EXPLORATION
    Type: Journal of Geophysical Research (ISSN 0148-0227); 89; 9449-945
    Format: text
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    NASA TECHNICAL REPORTS
  • 10
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    Mars' global properties - Maps and applications (1982)
    In:  Other Sources
    Details
    Publication Date: 2019-07-13
    Description: Mars data sets from many sources have been put into a common digital format and global maps at constant scale have been produced. These formatted data sets form the basis of the Mars Consortium. They currently include maps of geology, volcanic units, channels, wind features, topography, gravity, Viking approach and apoapsis color, predawn temperature residuals, thermal inertia, radiometric and solar albedo, water vapor abundance, 1.4 micrometers albedo, crater abundance, Earth-based radar and photographic telescope observations, and terrestrial spectral observations. The generation of these data sets is briefly described. As an example of their use, the mapped geologic units are characterized in terms of color, predawn temperature and elevation, and unusual areas identified. The Oxia Palus region is examined as an example of combining higher resolution data with the Consortium data sets. Use of the existing data sets and submission of new ones are encouraged.
    Keywords: LUNAR AND PLANETARY EXPLORATION
    Type: Lunar and Planetary Science Conference; Mar 16, 1981 - Mar 20, 1981; Houston, TX
    Format: text
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    NASA TECHNICAL REPORTS
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