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  • 1
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    Stress influence charts for transversely isotropic rocks (1998)
    In:  International Journal of Rock Mechanics and Mining Sciences, Taipei, AGU, vol. 35, no. 6, pp. 771-786, pp. B05204, (ISSN: 1340-4202)
    Details
    Publication Date: 1998
    Keywords: Stress ; Anisotropy ; Rock mechanics
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    BIBLIOGRAPHY SEISMOLOGY
  • 2
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    Generalized Radon Transformation inversion for elastic parameters using PP, Ps, SP, and SS seismic data (1990)
    Soc. Exp. Geophys.
    In:  60th Annual Meeting of SEG, San Francisco, Soc. Exp. Geophys., vol. 10, no. GL-TR-89-0259, pp. 1199-1202, (ISBN 0 08 042822 3)
    Details
    Publication Date: 1990
    Keywords: Inversion ; Seismics (controlled source seismology) ; Seismology
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    BIBLIOGRAPHY SEISMOLOGY
  • 3
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    Waste recycling issues in bioregenerative life support (1989)
    In:  Other Sources
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    Publication Date: 2011-08-19
    Description: Research and technology development issues centering on the recycling of materials within a bioregenerative life support system are reviewed. The importance of recovering waste materials for subsequent use is emphasized. Such material reclamation will substantially decrease the energy penalty paid for bioregenerative life support systems, and can potentially decrease the size of the system and its power demands by a significant amount. Reclamation of fixed nitrogen and the sugars in cellulosic materials is discussed.
    Keywords: MAN/SYSTEM TECHNOLOGY AND LIFE SUPPORT
    Type: Natural and Artificial Ecosystems, Espoo, Finland, July 18-29, 1988) Advances in Space Research (ISSN 0273-1177); 75-84
    Format: text
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    NASA TECHNICAL REPORTS
  • 4
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    Gallium-bearing sphalerite in a metal-sulfide nodule of the Qingzhen (EH3) chondrite (1986)
    In:  Other Sources
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    Publication Date: 2011-08-19
    Description: The composition and possible history of the Qingshen (EH3) chondrite is presented. The chondrite contains a population of spheroidal metal-sulfide nodules, which display textural evidence of reheating and melting. Evidence of metal sulfuration is also present, suggesting replacement of metal by sulfide during melting. This process has led to the nucleation of perryite along metal-sulfide interfaces. The Ga-bearing sphalerite that was found may have formed by injection of molten sulfide droplets into the metal followed by subsolidus diffusion of Ga from the metal into the sulfide. The latter may occur because of Ga supersaturation in the metal during progressive sulfuration and its decreased affinity for the metal phase during cooling below the taenite-kamacite transition point.
    Keywords: LUNAR AND PLANETARY EXPLORATION
    Type: Meteoritics (ISSN 0026-1114); 21; 23-31
    Format: text
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    NASA TECHNICAL REPORTS
  • 5
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    Incipient Failure Detection (IFD) of antifriction ball bearings (1980)
    In:  Other Sources
    Details
    Publication Date: 2011-08-18
    Description: Two methods were investigated for retrieving the ball bearing signals buried by the overall signature of an operating large engine such as the main space shuttle engine. The signal averaging method averages n** signals over a time duration equaling the known period of the ball bearing defect frequency. With this method, the desired ball bearing defect signal will be enhanced over the noise by a factor of the square root of n. A second method is to perform a further frequency analysis on the logarithmic spectrum in order to detect and separate different families of harmonics and sidebands, thereby giving information about modulating frequencies. These two alternate IFD methods were carried out with a Norland 3001 waveform and data system. The obtained results are then compared with the power spectral density (PSD) of the overall machine signals and conclusions are made accordingly.
    Keywords: MECHANICAL ENGINEERING
    Type: Alabama Univ. Res. Rept.: The 1980 NASA(ASEE Summer Fac. Fellowship Program; 24 p
    Format: text
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    NASA TECHNICAL REPORTS
  • 6
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    Azimuthally-dependent Finite Element Solution to the Cylindrical Resonator (1994)
    In:  Other Sources
    Details
    Publication Date: 2018-06-08
    Description: The cylindrical cavity resonator loaded with an anisotropic dielectric is analyzed as a two-dimensional problem using a finite element approach that assumes sinusoidal dependence in azimuth. This methodology allows the first finite element treatment of the technically important case of a resonator containing a sapphire element with a cylindrically aligned c axis. Second order trial functions together with quadrilateral elements are adopted in the calculations. The method was validated through comparisons with the analytical solutions for the hollow metal cavity and a coaxial cavity, as well as through measurements on a shielded sapphire resonator.
    Format: text
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    NASA TECHNICAL REPORTS
  • 7
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    Towards Time Automata and Multi-Agent Systems (2004)
    In:  CASI
    Details
    Publication Date: 2018-06-06
    Description: The design of reactive systems must comply with logical correctness (the system does what it is supposed to do) and timeliness (the system has to satisfy a set of temporal constraints) criteria. In this paper, we propose a global approach for the design of adaptive reactive systems, i.e., systems that dynamically adapt their architecture depending on the context. We use the timed automata formalism for the design of the agents' behavior. This allows evaluating beforehand the properties of the system (regarding logical correctness and timeliness), thanks to model-checking and simulation techniques. This model is enhanced with tools that we developed for the automatic generation of code, allowing to produce very quickly a running multi-agent prototype satisfying the properties of the model.
    Keywords: Computer Programming and Software
    Type: Proceedings 3rd NASA/IEEE Workshop on Formal Approaches to Agent-Based Systems (FAABS-III); 164-176
    Format: application/pdf
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    NASA TECHNICAL REPORTS
  • 8
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    X/Ka Celestial Frame Improvements: Vision to Reality (2010)
    In:  CASI
    Details
    Publication Date: 2018-06-06
    Description: In order to extend the International Celestial Reference Frame from its S/X-band (2.3/8.4 GHz) basis to a complementary frame at X/Ka-band (8.4/32 GHz), we began in mid-2005 an ongoing series of X/Ka observations using NASA s Deep Space Network (DSN) radio telescopes. Over the course of 47 sessions, we have detected 351 extra-galactic radio sources covering the full 24 hours of right ascension and declinations down to -45 degrees. Angular source position accuracy is at the part-per-billion level. We developed an error budget which shows that the main errors arise from limited sensitivity, mismodeling of the troposphere, uncalibrated instrumental effects, and the lack of a southern baseline. Recent work has improved sensitivity by improving pointing calibrations and by increasing the data rate four-fold. Troposphere calibration has been demonstrated at the mm-level. Construction of instrumental phase calibrators and new digital baseband filtering electronics began in recent months. We will discuss the expected effect of these improvements on the X/Ka frame.
    Keywords: Geophysics
    Type: Proceedings of the Sixth General Meeting of the International VLBI Service for Geodesy and Astrometry; 285-289; NASA/CP-2010-215864
    Format: application/pdf
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    NASA TECHNICAL REPORTS
  • 9
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    Precision actuation of micro-space structures (2000)
    In:  Other Sources
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    Publication Date: 2018-06-08
    Description: This paper evaluates the precision control of struts of the micro-space shell structure.
    Type: Smart Structures and Structronic Systems; Magdeburg; Germany
    Format: text
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    NASA TECHNICAL REPORTS
  • 10
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    Precision actuation of micro-space structures (2000)
    In:  Other Sources
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    Publication Date: 2018-06-08
    Description: This paper reports a study of precision actuation and control for micro-shell laminated space structures made of smart materials.
    Type: Smart Structures and Structronic Systems; Magdeburg; Germany
    Format: text
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    NASA TECHNICAL REPORTS
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