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  • 1
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    A miniature high-resolution accelerometer utilizing electron tunneling (1992)
    In:  Other Sources
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    Publikationsdatum: 2011-08-24
    Beschreibung: New methods have been developed to implement high-resolution position sensors based on electron tunneling. These methods allow miniaturization while utilizing the position sensitivity of electron tunneling to give high resolution. A single-element tunneling accelerometer giving a displacement resolution of 0.002 A/sq rt Hz at 10 Hz, corresponding to an acceleration resolution of 5 x 10 exp -8 g/sq rt Hz, is described. A new dual-element tunneling structure which overcomes the narrow bandwidth limitations of a single-element structure is described. A sensor with an operating range of 5 Hz to 10 kHz, which can have applications as an acoustic sensor, is discussed. Noise is analyzed for fundamental thermal vibration of the suspended masses and is compared to electronic noise. It is shown that miniature tunnel accelerometers can achieve resolution such that thermal noise in the suspended masses is the dominant cause of the resolution limit. With a proof mass of order 100 mg, noise analysis predicts limiting resolutions approaching 10 exp -9 g/sq rt Hz in a 300 Hz band and 10 exp -8 g/sq rt Hz at 1 kHz.
    Schlagwort(e): INSTRUMENTATION AND PHOTOGRAPHY
    Materialart: ; : International Conf
    Format: text
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  • 2
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    Reginal Geology of Hadley Rille, part F (1972)
    In:  CASI
    Details
    Publikationsdatum: 2005-11-30
    Beschreibung: Local geology of Hadley Rille near the landing site of Apollo 15 is described. Orbital photography from the Hasselblad, metric, and panoramic cameras is used to study regional relationships of the rille. The shape of the rille due to various natural causes is examined, along with stratigraphic measurements of mare materials.
    Schlagwort(e): GEOPHYSICS
    Materialart: NASA. Manned Spacecraft Center Apollo 15 Prelim. Sci. Rept.; 5 p
    Format: text
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  • 3
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    Brittle extension of the continental crust along a rooted system of low-angle normal faults: Colorado River extensional corridor (1985)
    In:  CASI
    Details
    Publikationsdatum: 2016-06-07
    Beschreibung: A transect across the 100 km wide Colorado River extensional corridor of mid-Tertiary age shows that the upper 10 to 15 km of crystalline crust extended along an imbricate system of brittle low-angle normal faults. The faults cut gently down a section in the NE-direction of tectonic transport from a headwall breakaway in the Old Woman Mountains, California. Successively higher allochthons above a basal detachment fault are futher displaced from the headwall, some as much as tens of kilometers. Allochthonous blocks are tilted toward the headwall as evidenced by the dip of the cappoing Tertiary strata and originally horizontal Proterozoic diabase sheets. On the down-dip side of the corridor in Arizona, the faults root under the unbroken Hualapai Mountains and the Colorado Plateau. Slip on faults at all exposed levels of the crust was unidirectional. Brittle thinning above these faults affected the entire upper crust, and wholly removed it locally along the central corridor or core complex region. Isostatic uplift exposed metamorphic core complexes in the domed footwall. These data support a model that the crust in California moved out from under Arizona along an asymmetric, rooted normal-slip shear system. Ductile deformation must have accompanied mid-Tertiary crustal extension at deeper structural levels in Arizona.
    Schlagwort(e): GEOPHYSICS
    Materialart: Lunar and Planetary Inst. Papers Presented to the Conference on Heat and Detachment in Crustal Extension on Continents and Planets; p 58
    Format: application/pdf
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  • 4
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    A star-pointing UV-visible spectrometer for remote-sensing of the stratosphere (1994)
    In:  CASI
    Details
    Publikationsdatum: 2013-08-31
    Beschreibung: We have constructed a novel instrument for ground-based remote sensing, by mounting a UV-visible spectrometer on a telescope and observing the absorption by atmospheric constituents of light from stars. Potentially, the instrument can observe stratospheric O3, NO3, NO2, and OClO.
    Schlagwort(e): INSTRUMENTATION AND PHOTOGRAPHY
    Materialart: NASA. Goddard Space Flight Center, Ozone in the Troposphere and Stratosphere, Part 2; p 731-734
    Format: application/pdf
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  • 5
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    Measurements of stratospheric composition using a star pointing spectrometer (1994)
    In:  CASI
    Details
    Publikationsdatum: 2013-08-31
    Beschreibung: Measurements of stratospheric composition have been made with a novel star-pointing spectrometer. The instrument consists of a telescope that focuses light from stars, planets, or the moon onto a spectrometer and two dimensional CCD array detector. Atmospheric absorptions can be measured, from which atmospheric columns of several gases can be determined. The instrument was deployed in Abisko, 69 deg N, during the European Arctic Stratospheric Ozone Experiment (EASOE). The instrument has the potential for measuring O3, OClO, NO2, and NO3. In this paper, a method for the retrieval of vertical columns is described, and some examples of ozone measurements given.
    Schlagwort(e): GEOPHYSICS
    Materialart: NASA. Goddard Space Flight Center, Ozone in the Troposphere and Stratosphere, Part 2; p 671-674
    Format: application/pdf
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  • 6
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    Impact breccias in carbonate rocks, Sierra Madera, Texas. (1971)
    In:  Other Sources
    Details
    Publikationsdatum: 2019-06-27
    Beschreibung: Two main types of deformational breccia occur in the Sierra Madera cryptoexplosion structure: monolithologic breccias composed of shattered rock of a single lithology and mixed breccias composed of rocks of several lithologies. Monolithologic breccias generally show no mineralogic signs of shock deformation, but a few samples are shatter-coned in a manner suggesting simultaneous formation of breccias and shatter cones. Mixed breccias, forming irregular, cross-cutting bodies, consistently contain moderately to highly shocked material, with mineralogic evidence of shock pressures of 50 kb to more than 200 kb, which, with evidence from the structural geometry of Sierra Madera and orientation of shatter cones, indicate an impact origin of the breccias. The mode of occurrence of the breccias, petrographic characteristics, and association with shock features are shared by breccias in many other cryptoexplosion structures in both carbonate and crystalline rock terranes, suggesting that such breccias have a common origin.
    Schlagwort(e): GEOPHYSICS
    Materialart: Geological Society of America Bulletin; 82; Apr. 197
    Format: text
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  • 7
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    Structure of Sierra Madera, Texas, as a guide to central peaks of lunar craters. (1972)
    In:  Other Sources
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    Publikationsdatum: 2019-06-27
    Beschreibung: The central peaks of Copernicus or a similar lunar crater have been considered as a target for manned exploration, partly on the supposition that the peaks expose rock uplifted from beneath the crater floor. This supposition is based on an analogy with central uplifts of terrestrial cryptoexplosion structures. Sierra Madera in west Texas is one of these structures. The structure of its central uplift is described as a proposed analog of the central peaks of large lunar impact craters. Setting and stratigraphy of the Sierra Madera are discussed together with structural framework, the central uplift, fold patterns, and fault patterns. It is concluded that the central uplifts of Sierra Madera and similar cryptoexplosion structures appear to be analogous to central peaks of large lunar impact craters.
    Schlagwort(e): GEOPHYSICS
    Materialart: Geological Society of America Bulletin; 83; Sept
    Format: text
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