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  • LUNAR AND PLANETARY EXPLORATION  (359)
  • AERODYNAMICS  (312)
  • EARTH RESOURCES AND REMOTE SENSING  (229)
  • SPACE RADIATION  (179)
Collection
Keywords
Years
  • 1
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    A general perturbation approach for computational fluid dynamics (1984)
    In:  Other Sources
    Details
    Publication Date: 2011-08-19
    Keywords: AERODYNAMICS
    Type: AIAA Journal (ISSN 0001-1452); 22; 1748-175
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  • 2
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    Snowpack monitoring in North America and Eurasia using passive microwave satellite data (1980)
    In:  Other Sources
    Details
    Publication Date: 2011-08-18
    Description: Areas of the Canadian high plains, the Montana and North Dakota high plains, and the steppes of central Russia have been studied in an effort to determine the utility of spaceborne microwave radiometers for monitoring snow depths in different geographic areas. Significant regression relationships between snow depth and microwave brightness temperatures were developed for each of these homogeneous areas. In each of the study areas investigated in this paper, Nimbus-6 (0.81 cm) ESMR data produced higher correlations than Nimbus-5 (1.55 cm) ESMR data in relating microwave brightness temperature to snow depth. It is difficult to extrapolate relationships between microwave brightness temperature and snow depth from one area to another because different geographic areas are likely to have different snowpack conditions.
    Keywords: EARTH RESOURCES AND REMOTE SENSING
    Type: Remote Sensing of Environment; 10; Dec. 198
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  • 3
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    Global Resources Information System (1984)
    In:  CASI
    Details
    Publication Date: 2016-03-09
    Description: The basic design criteria and operating characteristics of a Global Resources Information System GRIS are defined. Researchers are compiling background material and aiding JPL personnel in this project definition phase of GRIS. A bibliography of past studies and current work on large scale information systems is compiled. The material in this bibliography will be continuously updated throughout the lifetime of this grant. Project management, systems architecture, and user applications are also discussed.
    Keywords: EARTH RESOURCES AND REMOTE SENSING
    Type: Activities of the Remote Sensing Inform. Sci. Res. Group; 30 p
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  • 4
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    Annotated Bibliography of Global Resources Information Systems Related Publications (1984)
    In:  CASI
    Details
    Publication Date: 2016-03-09
    Description: An annotated bibliography of work concerning geophysical data management systems is presented. Major topics under investigation include data acquisition, data storage, long term data preservation, architecture, preprocessing, hydrology, land resources, geology, meteorology, and applications of remote sensing techniques.
    Keywords: EARTH RESOURCES AND REMOTE SENSING
    Type: Activities of the Remote Sensing Inform. Sci. Res. Group; 18 p
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  • 5
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    A study of the Rima Sirsalis lunar magnetic anomaly (1979)
    In:  Other Sources
    Details
    Publication Date: 2019-06-27
    Description: The source of the lunar magnetic anomaly associated with the Rima Sirsalis linear rille has been modelled using the vector field intensities due to arbitrary uniform magnetization in a rectangular prism. It is shown that in order to match the Apollo 16 subsatellite data, the lunar surface near the rille must have a vertical magnetization of 6,000-9,000 G if the anomaly is due to flux leakage from a gap in the crust with the dimensions of the rille. An alternative explanation is that Rima Sirsalis and its surroundings are the site of a vertical magnetization contrast of 100,000-10,000 G which is at least as wide as the rille and extends to a depth of tens of kilometers in the crust. A wider magnetic source reduces the required magnetization (or depth) proportionately, since to first order the field at high altitude is proportional to the magnetic dipole moment per unit length.
    Keywords: LUNAR AND PLANETARY EXPLORATION
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  • 6
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    VLBI measurements of radio source positions at the Jet Propulsion Laboratory (1980)
    In:  CASI
    Details
    Publication Date: 2019-06-27
    Description: The results of approximately 1300 observations of 67 radio sources are presented. Most of the measurements were made at the stations of the Deep Space Network in California, Spain, and Australia at wavelengths of 13.1 and 3.6 cm, between 1971 and 1978. The formal errors in the derived source positions are generally in the neighborhood of 0.01 seconds of arc and the positions agree fairly well with those previously published.
    Keywords: EARTH RESOURCES AND REMOTE SENSING
    Type: NASA. Goddard Space Flight Center Radio Interferometry; p 165-172
    Format: application/pdf
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  • 7
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    The influence of snow depth and surface air temperature on satellite-derived microwave brightness temperature (1980)
    In:  CASI
    Details
    Publication Date: 2019-06-28
    Description: Areas of the steppes of central Russia, the high plains of Montana and North Dakota, and the high plains of Canada were studied in an effort to determine the relationship between passive microwave satellite brightness temperature, surface air temperature, and snow depth. Significant regression relationships were developed in each of these homogeneous areas. Results show that sq R values obtained for air temperature versus snow depth and the ratio of microwave brightness temperature and air temperature versus snow depth were not as the sq R values obtained by simply plotting microwave brightness temperature versus snow depth. Multiple regression analysis provided only marginal improvement over the results obtained by using simple linear regression.
    Keywords: EARTH RESOURCES AND REMOTE SENSING
    Type: E83-10297 , NASA-TM-80695 , G-82F4507 , NAS 1.15:80695
    Format: application/pdf
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  • 8
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    A general perturbation approach for the equations of fluid dynamics (1983)
    In:  Other Sources
    Details
    Publication Date: 2019-07-13
    Description: An efficient numerical technique to produce accurate solutions to the equations of fluid dynamics is presented where the governing equations are perturbed about an approximate solution and solved by finite-difference methods on a coarsened grid. The result is a scheme which substantially reduces the number of grid points necessary to accurately resolve the flow. Applications are presented for the two-dimensional Euler equations perturbed about a solution of the transonic full potential equation. However, the concept is applicable to arbitrary equation sets, higher dimensions and for a wide variety of applications.
    Keywords: AERODYNAMICS
    Type: AIAA PAPER 83-1903 , Computational Fluid Dynamics Conference; Jul 13, 1983 - Jul 15, 1983; Danvers, MA
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  • 9
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    The diameter of Pallas from its occultation of SAO 85009 (1979)
    In:  Other Sources
    Details
    Publication Date: 2019-06-27
    Description: The May 29, 1978, occultation of SAO 85009 by Pallas was observed photoelectrically at seven widely spaced sites. The observations are well represented by an elliptical apparent limb profile having semimajor and semiminor axes of 279.5 + or - 2.9 and 262.7 + or - 4.5 km, respectively. Combining these results with published information on the light curve and rotational pole position, Pallas's mean diameter is found to be 538 + or - 12 km, which yields a mean density for Pallas of 2.8 + or - 0.5 g/cu cm and a visual geometric albedo of 0.103 + or - 0.005. The diameter of Pallas as determined from this occultation is significantly smaller than the values derived by radiometric, polarimetric, and double-image techniques.
    Keywords: LUNAR AND PLANETARY EXPLORATION
    Type: Astronomical Journal; 84; Feb. 197
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  • 10
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    Vortex lattice prediction of subsonic aerodynamics of hypersonic vehicle concepts (1977)
    In:  Other Sources
    Details
    Publication Date: 2011-08-17
    Description: The vortex lattice method introduced by Lamar and Gloss (1975) was applied to the prediction of subsonic aerodynamic characteristics of hypersonic body-wing configurations. The reliability of the method was assessed through comparison of the calculated and observed aerodynamic performances of two National Hypersonic Flight Research Facility craft at Mach 0.2. The investigation indicated that a vortex lattice model involving 120 or more panel elements can give good results for the lift and induced drag coefficients of the craft, as well as for the pitching moment at angles of attack below 10 to 15 deg. Automated processes for calculating the local slopes of mean-camber surfaces may also render the method suitable for use in preliminary design phases.
    Keywords: AERODYNAMICS
    Type: Journal of Aircraft; 14; Oct. 197
    Format: text
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