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  • 1
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    Distribution of stress axes' orientation in the Andaman-Nicobar island region: A possible stress model and its significance for extensional tectonics of the Andaman Sea (1992)
    In:  Phys. Earth Plan. Int., Warszawa, Elsevier, vol. 70, no. 4, pp. 57-63, pp. B08402, (ISBN: 0-12-018847-3)
    Details
    Publication Date: 1992
    Keywords: Stress ; Plate tectonics ; Modelling ; PEPI
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    BIBLIOGRAPHY SEISMOLOGY
  • 2
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    Discriminating quarry blasts from earthquakes using coda waves (1991)
    In:  Bull. Seism. Soc. Am., Tokyo, Inst. f. Theoret. Geodäsie, vol. 81, no. B2, pp. 162-178
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    Publication Date: 1991
    Keywords: Seismology ; Nuclear explosion ; Attenuation ; Frequency ; Spectrum ; BSSA
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    BIBLIOGRAPHY SEISMOLOGY
  • 3
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    Anuradha and low-energy cosmic rays (1993)
    In:  Other Sources
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    Publication Date: 2011-08-24
    Description: After critically reviewing observational results obtained by astronomical spacecraft in the interplanetary medium for several aspects of galactic cosmic rays (GCRs) and anomalous cosmic rays (ACRs), attention is given to spacecraft data gathered in the magnetosphere and a detailed description is given of the Anuradha cosmic-ray experiment carried by Spacelab-3. The Anuradha results discussed concern the orbit average flux and ionization state of ACRs, the origins of partially ionized galactic cosmic-ray sub-Fe and Fe ions, and the significance of enhanced abundance ratios of sub-Fe and Fe ions in GCRs inside the magnetosphere.
    Keywords: SPACE RADIATION
    Type: Space Science Reviews (ISSN 0038-6308); 62; 1-2; p. 3-65.
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    NASA TECHNICAL REPORTS
  • 4
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    Ionization states of low-energy cosmic rays - Results from Spacelab 3 cosmic-ray experiment (1993)
    In:  Other Sources
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    Publication Date: 2011-08-24
    Description: The Indian cosmic ray experiment Anuradha, conducted onboard Spacelab 3 during April 29-May 6, 1985 was designed to obtain information on the ionization states of low-energy cosmic rays, using the geomagnetic field as a rigidity filter to place an upper limit on the ionization state of individual cosmic ray particles. This paper presents data confirming the presence of three distinct groups of energetic particles in the near-earth space: (1) low-energy (15-25 MeV/nucleon) anomalous cosmic rays that are either singly ionized or consistent with their being in singly ionized state, (2) fully ionized galactic cosmic ray ions, and (3) partially ionized iron and sub-iron group ions (which account for about 20 percent of all the iron and sub-iron group ions detected at the Spacelab 3 orbit within the magnetosphere in the energy interval 25-125 MeV/nucleon). It is argued that these partially ionized heavy ions are indeed a part of the low-energy galactic cosmic rays present in the interplanetary space.
    Keywords: SPACE RADIATION
    Type: Astrophysical Journal, Part 1 (ISSN 0004-637X); 411; 1; p. 418-430.
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    NASA TECHNICAL REPORTS
  • 5
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    Application of the method of lines to planar transmission lines in waveguides with composite cross-sectional geometries (1992)
    In:  Other Sources
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    Publication Date: 2011-08-24
    Description: The analysis of a class of planar transmission lines in composite uniform waveguides which have a circular boundary over part of the cross-section and a rectangular boundary over the remainder is introduced. It is shown that the method of lines can be applied to such composite structures by taking advantage of the canonical geometry in each region. Results for the dispersion characteristics and impedance of a finline in such a structure are calculated.
    Keywords: ELECTRONICS AND ELECTRICAL ENGINEERING
    Type: IEE Proceedings, Part H - Microwaves, Antennas and Propagation (ISSN 0950-107X); 139; 6; p. 542-544.
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    NASA TECHNICAL REPORTS
  • 6
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    Thermal processing of omicron-terphenyl - A Raman study (1993)
    In:  Other Sources
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    Publication Date: 2011-08-24
    Description: Raman spectra from omicron-terphenyl sealed in glass capillary tubes were acquired over temperatures ranging from 233 to 343 K. Over this temperature range, omicron-terphenyl can exist in the solid-crystalline, molten, supercooled-liquid, and amorphous-glassy states. Representative structure-sensitive spectra are presented along with a qualitative description. The lattice spectral feature occurring at a Raman shift of 123/cm displays abrupt changes in profile and intensity as melting and glass transition occur. The intensity ratio of the C-C stretching 996/cm line and C-H stretching line at 1008/cm displays a change related to the transformation of the ordered-crystalline phase to the disordered-liquid or glassy state. At a Raman shift of 1162/cm the solid-crystalline state shows a splitting due to the effect of the crystal field. The possibility of using these structure-sensitive Raman characteristics for in situ diagnostics during materials processing is discussed.
    Keywords: MATERIALS PROCESSING
    Type: Applied Spectroscopy (ISSN 0003-7028); 47; 4; p. 458-462.
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    NASA TECHNICAL REPORTS
  • 7
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    Parallel, adaptive finite element methods for conservation laws (1994)
    In:  Other Sources
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    Publication Date: 2011-08-24
    Description: We construct parallel finite element methods for the solution of hyperbolic conservation laws in one and two dimensions. Spatial discretization is performed by a discontinuous Galerkin finite element method using a basis of piecewise Legendre polynomials. Temporal discretization utilizes a Runge-Kutta method. Dissipative fluxes and projection limiting prevent oscillations near solution discontinuities. A posteriori estimates of spatial errors are obtained by a p-refinement technique using superconvergence at Radau points. The resulting method is of high order and may be parallelized efficiently on MIMD computers. We compare results using different limiting schemes and demonstrate parallel efficiency through computations on an NCUBE/2 hypercube. We also present results using adaptive h- and p-refinement to reduce the computational cost of the method.
    Keywords: COMPUTER PROGRAMMING AND SOFTWARE
    Type: Applied Numerical Mathematics (ISSN 0618-9274); p. 255-283
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    NASA TECHNICAL REPORTS
  • 8
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    Rotation of ultrasonically levitated glycerol drops (1991)
    In:  Other Sources
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    Publication Date: 2011-08-24
    Description: Ultrasonic levitation is used to suspend single millimeter-size glycerol drops in a rectangular chamber. Audio-frequency laterally standing waves set up in the chamber are used to torque the suspended drops. The shape evolution of the drop under the combined effect of centrifugal forces and the acoustic radiation stress, along with its angular velocity are monitored, using video imaging and light scattering techniques. The results show good qualitative agreement with the theoretically predicted shape evolution as a function of angular velocity.
    Keywords: MATERIALS PROCESSING
    Type: Acoustical Society of America, Journal (ISSN 0001-4966); 90; 1502-150
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    NASA TECHNICAL REPORTS
  • 9
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    Optimal disturbance rejecting control of hyperbolic systems (1994)
    In:  CASI
    Details
    Publication Date: 2013-08-31
    Description: Optimal regulation of hyperbolic systems in the presence of unknown disturbances is considered. Necessary conditions for determining the optimal control that tracks a desired trajectory in the presence of the worst possible perturbations are developed. The results also characterize the worst possible disturbance that the system will be able to tolerate before any degradation of the system performance. Numerical results on the control of a vibrating beam are presented.
    Keywords: CYBERNETICS
    Type: NASA. Langley Research Center, NASA Workshop on Distributed Parameter Modeling and Control of Flexible Aerospace Systems; p 317-322
    Format: application/pdf
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    NASA TECHNICAL REPORTS
  • 10
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    An intelligent control system for failure detection and controller reconfiguration (1994)
    In:  CASI
    Details
    Publication Date: 2013-08-31
    Description: We present an architecture of an intelligent restructurable control system to automatically detect failure of system components, assess its impact on system performance and safety, and reconfigure the controller for performance recovery. Fault detection is based on neural network associative memories and pattern classifiers, and is implemented using a multilayer feedforward network. Details of the fault detection network along with simulation results on health monitoring of a dc motor have been presented. Conceptual developments for fault assessment using an expert system and controller reconfiguration using a neural network are outlined.
    Keywords: CYBERNETICS
    Type: NASA. Goddard Space Flight Center, The 1994 Goddard Conference on Space Applications of Artificial Intelligence; p 285-291
    Format: application/pdf
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    NASA TECHNICAL REPORTS
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