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  • 1
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    Rowe's stress-dilatancy relation based on friction (1976)
    ICE Publishing
    In:  Géotechnique, 26 (3). pp. 527-534.
    Details
    Publication Date: 2018-04-24
    Description: Rowe proposed a stress–dilatancy relation for granular assemblies in a dense packing of the form Ė=tan2(¼π+½φμ). He used a minimum energy ratio principle to develop this relation. It is shown here that the same result is obtained by considering the same model of toothed separation planes as that treated by Rowe, and applying to that model the laws of friction only.
    Type: Article , PeerReviewed
    Format: text
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    PAPER (OCEANREP)
  • 2
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    A new method for the numerical analysis of nonstationary signals (1976)
    In:  Phys. Earth Plan. Int., New York, Conseil de l'Europe, vol. 12, no. 5675, pp. 142-150, pp. B07307, (ISSN: 1340-4202)
    Details
    Publication Date: 1976
    Keywords: Filter- ; Data analysis / ~ processing ; PEPI
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    BIBLIOGRAPHY SEISMOLOGY
  • 3
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    Causality theory in systems analysis (1976)
    In:  Proceedings of the IEEE, Basel, Inst. f. Geophys., Ruhr-Univ. Bochum, vol. 64, no. 1, pp. 36, pp. 8038, (ISSN: 1340-4202)
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    Publication Date: 1976
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    BIBLIOGRAPHY SEISMOLOGY
  • 4
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    An interactive epicenter location procedure for the Resmac seismic array: I (1977)
    In:  Bull. Seism. Soc. Am., Berlin, Inst. Electrical & Electronics Engineers, vol. 67, no. 6, pp. 1577-1586, pp. B04307, (ISBN: 0534351875, 2nd edition)
    Details
    Publication Date: 1977
    Keywords: Location ; Seismic arrays ; Seismology ; BSSA
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    BIBLIOGRAPHY SEISMOLOGY
  • 5
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    Characteristics of regional seismicity before major earthquakes (1979)
    UNESCO Headquarters
    In:  paper presented at the International Symposium on Earthquake Prediction, 2-6 April 1979; Science-79/Conf. 801/Col. 14/III-6, Paris, UNESCO Headquarters, vol. 10, no. PL-TR-91-2231, pp. 193-197
    Details
    Publication Date: 1979
    Keywords: Seismicity ; Earthquake precursor: statistical anal. of seismicity ; China
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    BIBLIOGRAPHY SEISMOLOGY
  • 6
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    The new Martian nomenclature of the International Astronomical Union (1975)
    In:  Other Sources
    Details
    Publication Date: 2011-08-16
    Description: A new nomenclature for Martian regions and topographic features uncovered by Mariner 9, as officially adopted by the International Astronomical Union, is described. About 180 craters generally of diameters greater than 100 km have been named, as well as 13 classes of topographic features designated catena, chasma, dorsum, fossa, labyrinthus, mensa, mons, patera, planitia, planum, tholus, vallis, and vastitas. In addition seven craters and the Kepler Dorsum are named on Phobos, and two craters on Deimos. Coordinates and maps of each named feature are displayed.
    Keywords: LUNAR AND PLANETARY EXPLORATION
    Type: Icarus; 26; Sept
    Format: text
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    NASA TECHNICAL REPORTS
  • 7
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    Resonance-tube ignition of aluminum (1979)
    In:  Other Sources
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    Publication Date: 2011-08-17
    Description: An experimental program was carried out to determine whether spontaneous fluid-dynamic oscillations could create a hazard in gaseous oxygen flow systems by igniting metal contaminants. The particular fluid-dynamic oscillation studied was the resonance-tube phenomenon as it was excited in a tee-shaped configuration representative of configurations found in many industrial flow systems. Pure aluminum was chosen as the candidate material for ignition. The oscillations in the tee-shaped configuration were compared with oscillations driven by choked convergent nozzles and were found to differ markedly. The temperatures generated at the base of the resonance tube were well in excess of 1000 F for both gaseous oxygen and nitrogen. The effect of inert particulate matter introduced into the resonance tube was to increase significantly the measured temperatures. Aluminum in both powder and fiber form was readily ignited within the resonance tube at pressures less than 1200 psia. At higher pressures, the aluminum-oxygen mixture exploded. This investigation confirms the hazardous nature of resonance-tube oscillations as generated in typical piping configurations that use high-pressure oxygen.
    Keywords: INORGANIC AND PHYSICAL CHEMISTRY
    Type: Combustion and Flame; 35; Aug. 197
    Format: text
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    NASA TECHNICAL REPORTS
  • 8
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    Hydrogen-fueled diesel engine without timed ignition (1979)
    In:  Other Sources
    Details
    Publication Date: 2011-08-17
    Description: Experiments were carried out to investigate the feasibility of converting a diesel engine to hydrogen-fueled operation without providing a timed ignition system. Use was made of a glow plug and a multiple-strike spark plug. The glow plug was found to provide reliable ignition and smooth engine operation. It caused the hydrogen to ignite almost immediately upon the start of injection. Indicated mean effective pressures were on the order of 1.3 MPa for equivalence ratios between 0.1 and 0.4 at a compression ratio of 18. This is significantly higher than the corresponding result obtained with diesel oil (about 0.6 MPa for equivalence ratios between 0.3 and 0.9). Indicated thermal efficiencies were on the order of 0.4 for hydrogen and 0.20-0.25 for diesel oil. Operation with the multiple-strike spark system yielded similar values for IMEP and efficiency, but gave rise to large cycle-to-cycle variations in the delay between the beginning of injection and ignition. Large ignition delays were associated with large amplitude pressure waves in the combustion chamber. The measured NO(x) concentrations in the exhaust gas were of the order of 50-100 ppm. This is significantly higher than the corresponding results obtained with premixed hydrogen and air at low equivalence ratios. Compression ignition could not be achieved even at a compression ratio of 29.
    Keywords: INORGANIC AND PHYSICAL CHEMISTRY
    Type: International Journal of Hydrogen Energy; 4; 4, 19; 1979
    Format: text
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    NASA TECHNICAL REPORTS
  • 9
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    Assess II - A simulated mission of Spacelab (1978)
    In:  Other Sources
    Details
    Publication Date: 2011-08-17
    Description: For Assess II, the Spacelab mission simulation conducted in mid-1977, four payload specialists aboard a Convair 990 research aircraft performed six American and six European experiments during nine research flights each of six hours duration in order to evaluate the compatibility of training and experimental design. Mission organization and some initial data from the European experiments are reported. The experiments, conducted over the western U.S., involved infrared astronomy, solar brightness temperature, lidar, airglow TV, and a medical experiment for which physiological parameters were monitored. Conclusions concerning general principles of experiment design are discussed.
    Keywords: ASTRONAUTICS (GENERAL)
    Type: Nature; 275; Sept. 7
    Format: text
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    NASA TECHNICAL REPORTS
  • 10
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    The dynamical interaction between galaxies and intracluster gas in clusters of galaxies (1976)
    In:  Other Sources
    Details
    Publication Date: 2011-08-17
    Description: The interaction between the hot gas inferred to exist in clusters of galaxies and the interstellar medium of a spherical galaxy has been studied by means of time-dependent numerical hydrodynamics. Galaxies moving at transonic speeds with respect to the ambient medium lose 80% to 90% of their interstellar gas before a crossing time has elapsed. The amount of gas remaining is consistent with current observational limits to the gas content of elliptical galaxies. Negligible heating of the intracluster gas results from this process. Implications of these results for spiral galaxies with halos, radio sources in clusters of galaxies, and globular clusters in galactic halos are discussed.
    Keywords: ASTROPHYSICS
    Type: Astrophysical Journal; 210; Dec. 15
    Format: text
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    NASA TECHNICAL REPORTS
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