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  • GEOPHYSICS  (611)
  • Animals
  • 2000-2004
  • 1980-1984
  • 1970-1974  (611)
  • 1971  (611)
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  • 2000-2004
  • 1980-1984
  • 1970-1974  (611)
Year
  • 1
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    Geological features in Wyoming from Nimbus 1 (1971)
    In:  CASI
    Details
    Publication Date: 2005-11-30
    Description: The identification of ground features in Nimbus photography by comparisons with geology, soils, and vegetation maps is discussed for the Wyoming-Colorado area. It is concluded that in a semiarid region, high topographic relief shows good coassociation with exposed geology and with vegetation and, to a lesser degree, with soils types. In lower, flatter basins, most tonal patterns are related to subtle variations in soil color and vegetation cover. It is thought that maps based on spectral parameters as the proper descriptor of surface features may be required.
    Keywords: GEOPHYSICS
    Type: Significant Accomplishments in Sci., 1970; p 2-7
    Format: text
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  • 2
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    On the heterodyne method of detecting gravitational waves (1971)
    In:  CASI
    Details
    Publication Date: 2005-11-30
    Description: A mathematical model on the heterodyne method of detecting gravitational waves is presented, using a dumbbell consisting of two masses situated in a plane and a plane-fronted gravitational wave traveling perpendicular to the plane. It is concluded that the detector sensitivity is not likely to be improved without employing very complicated and expensive super low temperature techniques.
    Keywords: GEOPHYSICS
    Type: JPL Proc. of the Conf. on Exptl. Tests of Gravitation Theories; p 45-46
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  • 3
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    A cursory examination of the sensitivity of the tropospheric range and Doppler effects to the shape of the refractivity profile (1971)
    In:  CASI
    Details
    Publication Date: 2005-11-27
    Description: Ray tracing techniques for examination of refractivity profile sensitivity in tropospheric range and Doppler effects on profile shape
    Keywords: GEOPHYSICS
    Type: THE DEEP SPACE NETWORK, VOL. 1 15 FEB. 1971; P 22-30
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  • 4
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    An Eotvos experiment in earth orbit (1971)
    In:  CASI
    Details
    Publication Date: 2005-11-30
    Description: The gravitational interactions of mass energy stored in the weak interaction are being investigated. The magnitude of possible Eotvos anomalies, such as weak interaction, gravitational self-energy, spin-orbit interactions, and electromagnetic radiation reaction, are considered. A sensitive experiment was designed to determine whether weak interaction energy violates the equivalence principle. Factors to be considered in spacecraft design for the experiment are presented.
    Keywords: GEOPHYSICS
    Type: JPL Proc. of the Conf. on Exptl. Tests of Gravitation Theories; p 228-235
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  • 5
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    Observations of earth eigen vibrations possibly excited by low frequency gravity waves (1971)
    In:  CASI
    Details
    Publication Date: 2005-11-30
    Description: A cryogenic gravity meter made of two parts, a magnetic suspension unit and a detection module, was used to monitor earth eigen vibrations. The magnetic field and field gradient are generated by energizing a set of superconducting coils made of niobium-zirconium alloy wire. The detection module is a double Josephson junction magnetometer. The output is printed on a chart recorder and later digitized using a computer; a Fourier transformation is performed on the accumulated data. The measurements of eigen vibrations are summarized in tabular and graphical representations.
    Keywords: GEOPHYSICS
    Type: JPL Proc. of the Conf. on Exptl. Tests of Gravitation Theories; p 47-53
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  • 6
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    Experiment M405: Tri-axis flux gate magnetometer (1971)
    In:  CASI
    Details
    Publication Date: 2005-11-30
    Description: A tri-axis flux-gate magnetometer was used on four Gemini spacecraft for determination of the magnitude and direction of the local geomagnetic field with respect to the spacecraft. Conclusions derived from the data are not only important to the proton-electron spectrometer experiment, but also are of significance to any directional charged particle experiments that may be conducted. Even though the Gemini spacecraft was not clean magnetically, the data could be reduced to a form that supplied directional information on the magnetic field in relation to the spacecraft. Stray fields were the result of spacecraft structure, not the result of current flows that were produced within the spacecraft electrical systems. Efforts were made to reduce spacecraft stray fields and to facilitate the acquisition of more accurate data.
    Keywords: GEOPHYSICS
    Type: The Gemini Program: Phys. Sci. Expt. Sum.; p 153-168
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  • 7
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    ESRO study program for a space experiment on gravitation theories (1971)
    In:  CASI
    Details
    Publication Date: 2005-11-30
    Description: ESRO is considering a space experiment which is the definition phase. A more complete utilization of space techniques, leading to highly accurate acceleration measurements in a heliocentric spacecraft, together with an improved laser signal propagation method (using a space-borne atomic clock), could substantially increase the validity of the gravitational time delay test during solar conjunction. Preliminary investigations of the primary required techniques were carried out. These studies included an orbit analysis, investigation of drag-free techniques, and studies of the time measuring instrument. These studies were used to define the framework of a space experiment on gravitation theories. A preliminary feasibility study of the mission is being undertaken.
    Keywords: GEOPHYSICS
    Type: JPL Proc. of the Conf. on Exptl. Tests of Gravitation Theories; p 236-241
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  • 8
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    Testing general relativity: Progress, problems, and prospects (1971)
    In:  CASI
    Details
    Publication Date: 2005-11-30
    Description: The results from ground-based experimental testing are presented. Prospects for improving these experiments are discussed. Radar echo time delays, perihelion advance and solar oblateness, time variation of the gravitational constant, and radio wave deflection are considered. Ground-based and spacecraft techniques are compared on an accuracy vs. cost basis.
    Keywords: GEOPHYSICS
    Type: JPL Proc. of the Conf. on Exptl. Tests of Gravitation Theories; p 136-147
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  • 9
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    Tests of the equivalence principle and gravitation theory using solar system bodies (1971)
    In:  CASI
    Details
    Publication Date: 2005-11-30
    Description: The M sub g/M sub i ratio (ratio of body acceleration to gravitation field) of celestial bodies was measured. Deep probes of the post-Newtonian structure of gravitational theories are indicated. Kepler's third law is considered for the Sun-Jupiter system.
    Keywords: GEOPHYSICS
    Type: JPL Proc. of the Conf. on Exptl. Tests of Gravitation Theories; p 32-37
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  • 10
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    A borehole jack for deformability, strength, and stress measurements in a 2-inch borehole (1971)
    In:  CASI
    Details
    Publication Date: 2006-05-25
    Description: A borehole jack devised for lunar exploration is described and results of its use in simulated lunar solids are presented. A hydraulic cylinder mounted between two stiff plates acts to spread the plates apart against the borehole walls when pressured. The spreading is measured by a displacement transducer and the load is measured hydraulically. The main improvement over previous instruments is the increased stroke, which allows large deformations of the borehole. Twenty-eight pistons are used to obtain a high hydraulic efficiency, and three return pistons are also provided. Pressure-deformation curves were obtained for each test on Lunar Soil Simulant No. 2, a light gray silty basalt powder.
    Keywords: GEOPHYSICS
    Type: Lunar Surface Eng. Properties Expt. Definition, Vol. 3; 28 p
    Format: text
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