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  • EARTH RESOURCES AND REMOTE SENSING  (141)
  • AERODYNAMICS  (128)
  • INSTRUMENTATION AND PHOTOGRAPHY  (113)
  • ENERGY PRODUCTION AND CONVERSION
  • 1985-1989  (166)
  • 1980-1984
  • 1975-1979
  • 1970-1974  (245)
  • 1987  (166)
  • 1974  (245)
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  • 1985-1989  (166)
  • 1980-1984
  • 1975-1979
  • 1970-1974  (245)
Year
  • 1
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    A brief description of geological and geophysical exploration of the Marysville geothermal area (1974)
    In:  CASI
    Details
    Publication Date: 2016-06-07
    Description: Extensive geological and geophysical surveys were carried out at the Marysville geothermal area during 1973 and 1974. The area has high heat flow (up to microcalories per square centimeter-second, a negative gravity anomaly, high electrical resistivity, low seismic ground noise, and nearby microseismic activity. Significant magnetic and infrared anomalies are not associated with the geothermal area. The geothermal anomaly occupies the axial portion of a dome in Precambrian sedimentary rocks intruded by Cretaceous and Cenozoic granitic rocks. The results from a 2.4-km-deep test well indicate that the cause of the geothermal anomaly is hydrothermal convection in a Cenozoic intrusive. A maximum temperature of 95 C was measured at a depth of 500 m in the test well.
    Keywords: ENERGY PRODUCTION AND CONVERSION
    Type: JPL Proc. of the Conf. on Res. for the Develop. of Geothermal Energy Resources; p 98-110
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  • 2
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    Microbial abundance and thermoluminescence of antarctic dry valley soils (1974)
    In:  Other Sources
    Details
    Publication Date: 2019-06-27
    Keywords: EARTH RESOURCES AND REMOTE SENSING
    Type: Soil Science; 117; 1, 19; 1974
    Format: text
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  • 3
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    California nearshore processes - ERTS 1 (1974)
    In:  Other Sources
    Details
    Publication Date: 2019-07-13
    Description: The detectability of many nearshore processes from ERTS is made possible due to the suspended sediment present in the coastal waters. From viewing and analyzing the California coastal imagery collected during the last year and a half, the overall current patterns and their changes have become evident. It is now possible to map monthly and seasonal changes that occur throughout the year. The original objectives of detecting currents, sediment transport, estuaries and river discharge have now been expanded to include the use of ERTS information in operational problems of the U.S. Army Corps of Engineers. This incorporates the detected nearshore features into planning and organizing shore protection facilities.
    Keywords: EARTH RESOURCES AND REMOTE SENSING
    Type: International Symposium on Remote Sensing of Environment; Apr 15, 1974 - Apr 19, 1974; Ann Arbor, MI
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  • 4
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    Characterizing forest stands with multi-incidence angle and multi-polarized SAR data (1987)
    In:  Other Sources
    Details
    Publication Date: 2019-07-12
    Description: The potential for using HH-polarized L-band SAR data obtained at different incidence angles from satellite altitudes to identify and map different forest cover types and stand density classes is studied. Reasonably accurate results are obtained if the speckle characteristics of the data are suppressed by low-pass spatial filters and a contextual classification algorithm. Multipolarized L-band SAR data obtained from aircraft altitudes over the same test site are also analyzed to assess the relationships between polarization and forest stand characteristics. It is found that incidence angle controls, to a very large extent, the characteristics of the data and the type of information that can be obtained from L-band, HH-polarized satellite SAR data. Cross-polarization of L-band SAR data enhances and differentiates various forest stand characteristics which cannot be defined using only the like-polarized data, and vice-versa.
    Keywords: EARTH RESOURCES AND REMOTE SENSING
    Type: Advances in Space Research (ISSN 0273-1177); 7; 11 1
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  • 5
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    Selected satellite data on snow and ice in the Great Lakes basin 1972-73 /IFYGL/ (1974)
    In:  Other Sources
    Details
    Publication Date: 2019-07-13
    Description: Three snow-extent maps of the Lake Ontario drainage basin were prepared from NOAA-2 satellite visible band images during the International Field Year for the Great Lakes. These maps are discussed and the satellite data are evaluated for snow-extent mapping. The value of ERTS-1 imagery and digital data is also discussed in relation to the Lake Ontario basin studies. ERTS-1 MSS data are excellent for ice identification and analysis but are not useful for forecasting where timely receipt of data is imperative. NOAA-2 VHRR data are timely but the lower resolution of the VHRR makes identification of certain ice features difficult. NOAA-2 VHRR is well suited for snow-extent maps and thermal maps of large areas such as the 19,000 sq-km Lake Ontario basin.
    Keywords: EARTH RESOURCES AND REMOTE SENSING
    Type: International Association for Great Lakes Research, Annual Conference; Aug 12, 1974 - Aug 14, 1974; Ontario; Canada
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  • 6
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    Estimation of X-band scattering properties of tree components (1987)
    In:  Other Sources
    Details
    Publication Date: 2011-08-19
    Description: An X-band FM-CW very fine range resolution scatterometer was used to acquire backscattering data for a number of tree species. Using a model to describe the scattering source function and an experimental procedure for selected removal of plant parts allows the estimation of the volume backscatter coefficient and the volume extinction coefficient. It is found that: (1) leaves are strong attenuators as well as scatterers; (2) the albedo at a given angle of incidence is nearly independent of the tree type; (3) the tree limbs are good attenuators but rather poor scatterers; and (4) the albedo changes as a function of the angle of incidence and for deciduous trees is also a function of the season.
    Keywords: EARTH RESOURCES AND REMOTE SENSING
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  • 7
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    SAS-2 observations of gamma rays from the galactic plane (1974)
    In:  Other Sources
    Details
    Publication Date: 2011-08-16
    Description: Preliminary data are given for the SAS-2 high energy galactic gamma ray observation. These data include both latitude and longitude distributions. The longitude distribution shows a high density region. The latitude distributions toward the center and the anti-center are markedly different, the former showing a two-component structure of half-widths of approximately 3 and 6 deg. The energy spectrum in the range 35 to 200 MeV is hard, consistent with cosmic ray interactions with interstellar matter, including neutral pions decay and emission from energetic electron interactions. The data is consistent with an interpretation in terms of the confinement of the cosmic rays in the spiral arms.
    Keywords: INSTRUMENTATION AND PHOTOGRAPHY
    Type: ESRO The Context and Status of Gamma Ray Astronomy; p 201-204
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  • 8
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    Extraction of spectral hemispherical reflectance (albedo) of surfaces from nadir and directional reflectance data (1987)
    In:  Other Sources
    Details
    Publication Date: 2011-08-19
    Description: A radiative transfer model is used to investigate how the error of spectral hemispherical reflectance data obtained from nadir reflectance values varies with wavelength, solar zenith angle, leaf area index, and leaf orientation distribution. Several techniques employing multiple off-nadir view angles taken in azimuth planes are found to accurately infer spectral hemispherical reflectances, and to be well suited to sensor systems that scan in a known azimuth plane or view fore and aft in a known azimuth plane. The effects of errors in hemispherical reflectance on terrestrial energy budget and productivity calculations is also considered.
    Keywords: EARTH RESOURCES AND REMOTE SENSING
    Type: International Journal of Remote Sensing (ISSN 0143-1161); 8; 1727-174
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  • 9
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    A simple device for the preparation of embedded materials science specimens for ultramicrotomy (1987)
    In:  Other Sources
    Details
    Publication Date: 2011-08-19
    Description: A simple hand-held grinding fixture is discussed which can produce microtome mounts of hard materials, oriented interfaces, and powders embedded in a 5/16-in plastic rod. The device has been used for the ultramicrotomy of meteorite samples, 10-50 micron interplanetary dust particles, and thin films on plastic. Results are presented for a layer lattice silicate from the Murchison carbonaceous chondrite, illustrating the resolution and structural detail that can be obtained with the method.
    Keywords: INSTRUMENTATION AND PHOTOGRAPHY
    Type: Journal of Electron Microscopy Technique (ISSN 0741-0581); 6; 305
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  • 10
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    Perovskite oxides: Oxygen electrocatalysis and bulk structure (1987)
    In:  CASI
    Details
    Publication Date: 2013-08-31
    Description: Perovskite type oxides were considered for use as oxygen reduction and generation electrocatalysts in alkaline electrolytes. Perovskite stability and electrocatalytic activity are studied along with possible relationships of the latter with the bulk solid state properties. A series of compounds of the type LaFe(x)Ni1(-x)O3 was used as a model system to gain information on the possible relationships between surface catalytic activity and bulk structure. Hydrogen peroxide decomposition rate constants were measured for these compounds. Ex situ Mossbauer effect spectroscopy (MES), and magnetic susceptibility measurements were used to study the solid state properties. X ray photoelectron spectroscopy (XPS) was used to examine the surface. MES has indicated the presence of a paramagnetic to magnetically ordered phase transition for values of x between 0.4 and 0.5. A correlation was found between the values of the MES isomer shift and the catalytic activity for peroxide decomposition. Thus, the catalytic activity can be correlated to the d-electron density for the transition metal cations.
    Keywords: ENERGY PRODUCTION AND CONVERSION
    Type: NASA-Lewis Research Center, Space Electrochemical Research and Technology (SERT); p 221-23
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