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  • 1
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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
    Details
    Publication Date: 1991
    Keywords: Seismology ; Nuclear explosion ; Attenuation ; Frequency ; Spectrum ; BSSA
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    BIBLIOGRAPHY SEISMOLOGY
  • 2
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    Rotation of ultrasonically levitated glycerol drops (1991)
    In:  Other Sources
    Details
    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
    Format: text
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    NASA TECHNICAL REPORTS
  • 3
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    Stabilization of large space structures by linear reluctance actuators (1991)
    In:  CASI
    Details
    Publication Date: 2013-08-31
    Description: Application of magnetic forces are considered for stabilization of vibrations of flexible space structures. Three electromagnetic phenomena are studied, such as: (1) magnetic body force; (2) reluctance torque; and (3) magnetostriction, and their application is analyzed for stabilization of a beam. The magnetic body force actuator uses the force that exists between poles of magnets. The reluctance actuator is configured in such a way that the reluctance of the magnetic circuit will be minimum when the beam is straight. Any bending of the beam increases the reluctance and hence generates a restoring torque that reduces bending. The gain of the actuator is controlled by varying the magnetizing current. Since the energy density of a magnetic device is much higher compared to piezoelectric or thermal actuators, it is expected that the reluctance actuator will be more effective in controlling the structural vibrations.
    Keywords: SPACECRAFT DESIGN, TESTING AND PERFORMANCE
    Type: NASA. Langley Research Center, Fourth NASA Workshop on Computational Control of Flexible Aerospace Systems, Part 1; p 15-21
    Format: application/pdf
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    NASA TECHNICAL REPORTS
  • 4
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    Implications of the observations of partially ionised states in the low energy galactic cosmic rays (1991)
    In:  Other Sources
    Details
    Publication Date: 2019-07-13
    Description: Of the low energy (30-100 MeV/N)Fe-group nuclei of Galactic cosmic rays (GCRs) a fraction of about 20 percent of these are in partially ionized states. The origin of these particles are not known at present. From the considerations of relevant cross-sections, the following two important processes of the phenomena are given: (1) these GCR Fe-group nuclei must have captured the orbital electrons at energies of 1-5 MeV/N, while traversing matter; and (2) that these GCR ions of 1-5 MeV/N are then reaccelerated to energies of at least 30-100 MeV/N, most probably in the heliospheric boundary region. Three possible scenarios of the electron-capture processes are briefly discussed: (1) electron capture in a large molecular cloud; (2) GCR equilibrium spectra in ISM and their equilibrium charge; and (3) electron capture in the Oort's cloud.
    Keywords: SPACE RADIATION
    Type: International Cosmic Ray Conference; Aug 11, 1991 - Aug 23, 1991; Dublin
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    NASA TECHNICAL REPORTS
  • 5
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    LASE Observations of Interactions Between African Easterly Waves and the Saharan Air Layer (2010)
    In:  CASI
    Details
    Publication Date: 2019-07-13
    Description: The Lidar Atmospheric Sensing Experiment (LASE) participated in the NASA African Monsoon Multidisciplinary Analyses (NAMMA) field experiment in 2006 that was conducted from Sal, Cape Verde to study the Saharan Air Layer (SAL) and its influence on the African Easterly Waves (AEWs) and Tropical Cyclones (TCs). During NAMMA, LASE collected simultaneous water vapor and aerosol lidar measurements from 14 flights onboard the NASA DC- 8. In this paper we present three examples of the interaction of the SAL and AEWs regarding: moistening of the SAL and transfer of latent heat; injection of dust in an updraft; and influence of dry air intrusion on an AEW. A brief discussion is also given on activities related to the refurbishment of LASE to enhance its operational performance and plans to participate in the next NASA hurricane field experiment in the summer of 2010.
    Keywords: Meteorology and Climatology
    Type: NF1676L-10415 , 25th International Laser Radar Conference; Jul 05, 2010 - Jul 09, 2010; Saint Petersburg; Russia
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    NASA TECHNICAL REPORTS
  • 6
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    Performance Analysis of Scientific and Engineering Applications Using MPInside and TAU (2010)
    In:  CASI
    Details
    Publication Date: 2019-07-13
    Description: In this paper, we present performance analysis of two NASA applications using performance tools like Tuning and Analysis Utilities (TAU) and SGI MPInside. MITgcmUV and OVERFLOW are two production-quality applications used extensively by scientists and engineers at NASA. MITgcmUV is a global ocean simulation model, developed by the Estimating the Circulation and Climate of the Ocean (ECCO) Consortium, for solving the fluid equations of motion using the hydrostatic approximation. OVERFLOW is a general-purpose Navier-Stokes solver for computational fluid dynamics (CFD) problems. Using these tools, we analyze the MPI functions (MPI_Sendrecv, MPI_Bcast, MPI_Reduce, MPI_Allreduce, MPI_Barrier, etc.) with respect to message size of each rank, time consumed by each function, and how ranks communicate. MPI communication is further analyzed by studying the performance of MPI functions used in these two applications as a function of message size and number of cores. Finally, we present the compute time, communication time, and I/O time as a function of the number of cores.
    Keywords: Computer Operations and Hardware
    Type: ARC-E-DAA-TN1911 , 12th IEEE HPCC conference; Sep 01, 2010 - Sep 03, 2010; Melbourne; Australia
    Format: application/pdf
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    NASA TECHNICAL REPORTS
  • 7
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    Data Products for the OCTL to OICETS Optical Link Experiment (2010)
    In:  Other Sources
    Details
    Publication Date: 2019-07-13
    Description: JPL has developed a series of software and hardware tools to analyze and record data from a 50Mb/s down and 2 Mb/s up bi-directional optical link with the LUCE terminal onboard the LEO OICETS satellite. This paper presents the data products for this experiment including the system architecture and analysis of the actual data received.
    Keywords: Documentation and Information Science; Computer Operations and Hardware; Computer Programming and Software; Space Communications, Spacecraft Communications, Command and Tracking; Communications and Radar
    Type: SPIE Photonics West 2010; Jan 23, 2010 - Jan 28, 2010; San Francisco, CA; United States
    Format: text
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    NASA TECHNICAL REPORTS
  • 8
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    OCTL Planning, Tests and Operations for the Bi-Directional Link to the OICETS (2010)
    In:  Other Sources
    Details
    Publication Date: 2019-07-13
    Description: No abstract available
    Keywords: Spacecraft Design, Testing and Performance; Space Communications, Spacecraft Communications, Command and Tracking; Space Sciences (General)
    Type: Optical Interorbit Communications Engineering Test Satellite (OICETS) Workshop; May 13, 2010 - May 15, 2010; Tenerife; Spain
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    NASA TECHNICAL REPORTS
  • 9
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    Emulating an Optical Planetary Access Link with an Aircraft (2010)
    In:  Other Sources
    Details
    Publication Date: 2019-07-13
    Description: Video imagery was streamed from the ground to an aircraft using a free-space laser communication link. The link operated at 270 Mb/s over slant ranges of 5-9 km in day and night time background conditions. The experiment was designed to demonstrate autonomous link acquisition and served as a first proof-of-concept for a planetary access link between a surface asset and an orbiter at Mars. System parameters monitored during the link demonstration including acquisition and tracking and communication performance are discussed.
    Keywords: Communications and Radar; Optics
    Type: SPIE Photonics West Conference; Jan 23, 2010 - Jan 28, 2010; San Francisco, CA; United States
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    NASA TECHNICAL REPORTS
  • 10
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    Preliminary Results of the OCTL to OICETS Optical Link Experiment (OTOOLE) (2010)
    In:  Other Sources
    Details
    Publication Date: 2019-07-13
    Description: JPL in collaboration with JAXA and NICT demonstrated a 50Mb/s downlink and 2Mb/s uplink bi-directional link with the LEO OICETS satellite. The experiments were conducted in May and June over a variety of atmospheric conditions. Bit error rates of 10-(sup 1) to less than 10-? were measured on the downlink. This paper describes the preparations, precursor experiments, and operations for the link. It also presents the analyzed downlink data results.
    Keywords: Communications and Radar
    Type: SPIE Photonics West; Jan 23, 2010 - Jan 28, 2010; San Francisco, CA; United States
    Format: text
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    NASA TECHNICAL REPORTS
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