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  • 1
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    Thermal infrared investigations, Mill Creek area, Oklahoma (1969)
    In:  Other Sources
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    Publikationsdatum: 2011-08-16
    Beschreibung: Thermal and infrared imagery of Mill Creek Area, Oklahoma
    Schlagwort(e): GEOPHYSICS
    Materialart: NASA. MANNED SPACECRAFT CENTER 2D ANN. EARTH RESOURCES AIRCRAFT PROGRAM STATUS REV., VOL. 1 1969 (SEE N71-19251 08-13)
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  • 2
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    Airborne flux measurements of trace species in an Arctic boundary layer (1992)
    In:  Other Sources
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    Publikationsdatum: 2011-08-24
    Beschreibung: In situ airborne flux values for O3, CO, an CH4 over selected wetlands of Alaska are reported, and airborne CH4 flux measurements are presented for the first time. The source/sink distribution over the Yukon-Kuskokwim Delta (YKD) is qualitatively correlated with surface vegetation type. The CH4 source strength over the YKD ranged from 25 to 85 mg/sq m/d. A spatially averaged, seasonally adjusted source strength of 51 mg/sq m/d was established for the YKD. Indirect CH4 flux estimates obtained over the Alaskan North Slope indicate a much lower source strength. The global CH4 emission from tundra are estimated to be 44 Tg/a at an upper limit. Airborne CO flux measurements over the YKD indicate low negative flux values over the coastal areas, while some positive fluxes were observed in the inland sparsely forested regions. An inspection of the cospectrum of CO with vertical velocity for sample runs in coastal areas indicate the possibility of in situ photochemical destruction/production of CO.
    Schlagwort(e): GEOPHYSICS
    Materialart: Journal of Geophysical Research (ISSN 0148-0227); 97; D15; p. 16,601-16,625.
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  • 3
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    Linear geologic structure and magic rock discrimination as determined from infrared data (1970)
    In:  CASI
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    Publikationsdatum: 2005-11-30
    Beschreibung: Color infrared photographs of the Beartooth Mountains, Montana show the distribution of mafic dikes and amphibolite bodies. Lineaments that cross grassy plateaus can be identified as dikes by the marked constrast between the dark rocks and the red vegetation. Some amphibolite bodies in granitic terrain can also be detected by infrared photography and their contacts can be accurately drawn due to enchanced contrast of the two types of rock in the near infrared. Reflectance measurements made in the field for amphibolite and granite show that the granite is 25% to 50% more reflective in the near infrared than in the visible region. Further enhancement is due to less atmospheric scattering than in the visible region. Thermal infrared images of the Mill Creek, Oklahoma test site provided information on geologic faults and fracture systems not obtainable from photographs. Subtle stripes that cross outcrop and intervening soil areas and which probably record water distribution are also shown on infrared photographs.
    Schlagwort(e): GEOPHYSICS
    Materialart: NASA. Manned Spacecraft Center 3d Ann. Earth Resources Program Rev., vol. 1; 12 p
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  • 4
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    Multispectral analysis of limestone, dolomite, and granite, Mill Creek, Oklahoma (1970)
    In:  CASI
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    Publikationsdatum: 2005-11-30
    Beschreibung: Spectral reflectance and thermal emission data were collected at the Mill Creek, Oklahoma test site during NASA missions 132 and 133 in June 1970. The data were collected by three aircraft flown several times during the diurnal cycle at altitudes of 150 to 17,000 m above mean terrain. Reflectance of the main rock types (limestone, dolomite, and granite) was determined from the data collected using a 12-channel multispectral scanner during mission 133 and from thermal infrared images recorded during mission 132 on an RS-7 scanner from 17,000 m above terrain. A preliminary rock recognition map was generated automatically using data collected from 900 m above terrain. The discrimination provided by the map is reasonably accurate. Misidentification occurred in areas of unusually high dolomite reflectivity. High altitude thermal infrared (10 to 12 micrometers) images show regional folds and faults distinguished by the presence of thermally contrasting materials. Linear and curvilinear structural features two to three times smaller than the nominal 17 m resolution could be detected.
    Schlagwort(e): GEOPHYSICS
    Materialart: NASA. Manned Spacecraft Center 3d Ann. Earth Resources Program Rev., vol. 1; 114 p
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  • 5
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    Seismic investigation of near-surface cavities - A preliminary report (1965)
    In:  CASI
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    Publikationsdatum: 2006-10-26
    Beschreibung: Wall vibrations and amplitude attenuations measured in tunnel and cavity formed by underground nuclear explosion
    Schlagwort(e): GEOPHYSICS
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  • 6
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    Two-step method for evolving nonlinear acoustic systems to a steady state (1992)
    In:  Other Sources
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    Publikationsdatum: 2011-08-24
    Schlagwort(e): ACOUSTICS
    Materialart: AIAA Journal (ISSN 0001-1452); 30; 7, Ju; 1724-173
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  • 7
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    Numerical computation of steady-state acoustic disturbances in flow (1992)
    In:  Other Sources
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    Publikationsdatum: 2011-08-24
    Beschreibung: Two time domain methods for computing two dimensional steady-state acoustic disturbances propagating through internal subsonic viscous flow fields in the presence of variable area are investigated. The first method solves the Navier-Stokes equations for the combined steady and acoustic field together and subtracts the steady flow to obtain the acoustic field. The second method solves a system of perturbation equations to obtain the acoustic disturbances, making use of a separate steady flow computation as input to the system. In each case the periodic steady-state acoustic fluctuations are obtained numerically on a supercomputer using a second order unsplit explicit MacCormack predictor-corrector method. Results show that the first method is not very effective for computing acoustic disturbances of even moderate amplitude. It appears that more accurate steady flow algorithms are required for this method to succeed. On the other hand, linear and nonlinear acoustic disturbances extracted from the perturbation approach are shown to exhibit expected behavior for the problems considered. It is also found that inflow boundary conditions for an equivalent uniform duct can be successfully applied to a nonuniform duct to obtain steady-state acoustic disturbances.
    Schlagwort(e): ACOUSTICS
    Materialart: In: DGLR(AIAA Aeroacoustics Conference, 14th, Aachen, Germany, May 11-14, 1992, Proceedings. Vol. 1 (A93-19126 05-71); p. 428-437.
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  • 8
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    Data survey and evaluation (1980)
    In:  Other Sources
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    Publikationsdatum: 2011-08-19
    Schlagwort(e): GEOPHYSICS
    Materialart: NASA, Washington Upper Atmosphere Res. Program; p 214
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  • 9
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    Kinetics of stratospheric reactions (1980)
    In:  Other Sources
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    Publikationsdatum: 2011-08-19
    Schlagwort(e): GEOPHYSICS
    Materialart: NASA, Washington Upper Atmosphere Res. Program; p 96-97
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  • 10
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    Geological material discrimination from Nimbus satellite data (1972)
    In:  Other Sources
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    Publikationsdatum: 2011-08-16
    Beschreibung: An analysis was made of Nimbus satellite data to determine its suitability in determining the physical properties of surface materials. Attempts were also made to use these data in developing analytical techniques for handling data from other earth resources and meteorological satellites.
    Schlagwort(e): GEOPHYSICS
    Materialart: NASA. Manned Spacecraft Center 4th Ann. Earth Resources Program Rev., Vol. 3; 15 p
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