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  • Other Sources  (1,968)
  • 1990-1994  (1,968)
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  • 1
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    Microwave and optical lunar transponders (1990)
    In:  Other Sources
    Details
    Publication Date: 2019-07-13
    Description: The scientific areas which used data from the Lunar Laser Ranging Experiment, collected from measurements to the Apollo 11, 14, and 15 and Lunakhod 2, include lunar science (i.e., studies of variations in the lunar angular orientation from that for uniform rotation, lunar tidal displacements, and the lunar mass distribution), geodynamics, astrometry, and gravitational physics. This paper argues that the placement of microwave and optical transponders on the moon would improve the accuracy of laser range measurements by nearly two orders of magnitude and would simplify the measurements. The K-band microwave transponders would be operated at the lunar base and at two remote sites on the moon surface, yielding much improved lunar libration and tidal displacement measurements. A two-wavelength laser transponder also would be operated at the lunar base, allowing accurate tropospheric propagation corrections to be made. This would introduce major improvements in measurements of the lunar orbit and of the earth's rotation, and in tests of general relativity.
    Keywords: ASTRONOMY
    Type: Astrophysics from the Moon; Feb 05, 1990 - Feb 07, 1990; Annapolis, MD; United States
    Format: text
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  • 2
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    Variations in fault slip and strain accumulation at Parkfield, California: Initial results using two-color geodimeter measurements, 1984-1988 (1990)
    In:  J. Geophys. Res., Basel, Elsevier Science Publishers, vol. 95, no. 16, pp. 2533-2552, pp. L03307, (ISSN: 1340-4202)
    Details
    Publication Date: 1990
    Keywords: Earthquake precursor: prediction research ; Earthquake precursor: deformation or strain ; Fault zone ; Geodesy ; Crustal deformation (cf. Earthquake precursor: deformation or strain) ; JGR
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    BIBLIOGRAPHY SEISMOLOGY
  • 3
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    Rg observations from four continents: inverse- and forward-modelling experiments (1993)
    In:  Geophys. J. Int., Basel, Inst. f. Geophys., Ruhr-Univ. Bochum, vol. 114, no. 2, pp. 465-472, pp. 1019, (ISSN: 1340-4202)
    Details
    Publication Date: 1993
    Keywords: Seismology ; Rg waves ; Modelling ; Inversion ; GJI
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    BIBLIOGRAPHY SEISMOLOGY
  • 4
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    Erdwärme. Energieträger der Zukunft? Fakten-Forschung-Zukunft (1992)
    MeSy GmbH
    In:  Bochum, MeSy GmbH, vol. 6, no. Publ. No. 12, pp. 81-89, (ISBN 0-444-50971-2)
    Details
    Publication Date: 1992
    Keywords: Geothermics ; Textbook of geophysics ; Project report/description ; FRUMMEL
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    BIBLIOGRAPHY SEISMOLOGY
  • 5
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    ERS-1 SAR ice routing of l'Astrolabe through the Northeast passage (1992)
    In:  CASI
    Details
    Publication Date: 2008-05-11
    Description: The use of Synthetic Aperture Radar (SAR) data from the satellite ERS-1 to assist the French polar vessel 'L'Astrolabe' during its navigation through Artic sea ice in the Northeast Passage is reported. The ship spent one month on the voyage from Europe to Japan, and high resolution SAR images and ice maps based on SAR images from ERS-1 and Special Sensor Microwave/Imager were telefaxed to the ship using the Inmarsat system. The time delay from observation to the reception of SAR images aboard the ship varied from 6 hours to two days. The quality of these ice maps was compared with Russian ice maps and observations from the ship. The SAR imagery provided detailed information on ice floe distribution, ice concentration, ice types, open leads, and tracks in ice from icebreakers. The response from the Russian ice specialists on the quality of the SAR ice maps was very positive.
    Keywords: EARTH RESOURCES AND REMOTE SENSING
    Type: ESA, Environment Observation and Climate Modelling Through International Space Projects. Volume 3: Earth Observation Space Programmes, SAFISY Activities, Strategies of International Organisations, Legal Aspects; p 997-1002
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  • 6
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    Differential rotation and turbulent convection: A new Reynolds stress model and comparison with solar data (1994)
    In:  Other Sources
    Details
    Publication Date: 2011-08-24
    Description: In most hydrodynamic cases, the existence of a turbulent flow superimposed on a mean flow is caused by a shear instability in the latter. Boussinesq suggested the first model for the turbulent Reynolds stresses bar-(u(sub i)u(sub j)) in which the mean shear S(sub ij) is the cause (or source) of turbulence represented by the stress bar-(u(sub i)u(sub j)). In the case of solar differential rotation, exactly the reverse physical process occurs: turbulence (which must pre-exist) generates a mean flow which manifests itself in the form of differential rotation. Thus, the Boussinesq model is wholly inadequate because in the solar case, cause and effect are reversed. Since the Boussinesq model is inadequate, one needs an alternative model for the Reynolds stresses. We present a new dynamical model for the Reynolds stresses, convective fluxes, turbulent kinetic energy, and temperature fluctuations. The complete model requires the solution of 11 differential equations. We then introduce a set of simplifying assumptions which reduce the full dynamical model to a set of algebraic Reynolds stress models. We explicitly solve one of these models that entails only one differential equation. The overall agreement with the data is obtained with a model that is neither phenomenological nor one that requires a full numerical simulation, since it is algebraic in nature. The new model can play an important role in understanding the complex physics underlying the interplay between solar differential rotation and convection, as many physical processes can naturally be incorporated into the model.
    Keywords: ASTROPHYSICS
    Type: Astrophysical Journal, Part 1 (ISSN 0004-637X); 425; 1; p. 303-325
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  • 7
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    Guide star catalogue data retrieval software 2 (1992)
    In:  CASI
    Details
    Publication Date: 2013-08-31
    Description: The Guide Star Catalog (GSC), being the largest astronomical catalog to date, is widely used by the astronomical community for all sorts of applications, such as statistical studies of certain sky regions, searches for counterparts to observational phenomena, and generation of finder charts. It's format (2 CD-ROM's) requires minimum hardware and is ideally suited for all sorts of conditions, especially observations. Unfortunately, the actual GSC data is not easily accessible. It takes the form of FITS tables, and the coordinates of the objects are given in one coordinate system (equinox 2000). The included reading software is rudimentary at best. Thus, even generation of a simple finder chart is not a trivial undertaking. To solve this problem, at least for PC users, GUIDARES was created. GUIDARES is a user-friendly program that lets you look directly at the data in the GSC, either as a graphical sky map or as a text table. GUIDARES can read a sampling of GSC data from a given sky region, store this sampling in a text file, and display a graphical map of the sampled region in projected celestial coordinates (perfect for finder charts). GUIDARES supports rectangular and circular regions defined by coordinates in the equatorial, ecliptic (any equinox) or galactic systems.
    Keywords: COMPUTER PROGRAMMING AND SOFTWARE
    Type: NASA, Washington, Second Annual Conference on Astronomical Data Analysis Software and Systems. Abstracts; p 102
    Format: application/pdf
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  • 8
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    Computational mechanics analysis tools for parallel-vector supercomputers (1993)
    In:  Other Sources
    Details
    Publication Date: 2019-04-02
    Description: Computational algorithms for structural analysis on parallel-vector supercomputers are reviewed. These parallel algorithms, developed by the authors, are for the assembly of structural equations, 'out-of-core' strategies for linear equation solution, massively distributed-memory equation solution, unsymmetric equation solution, general eigen-solution, geometrically nonlinear finite element analysis, design sensitivity analysis for structural dynamics, optimization algorithm and domain decomposition. The source code for many of these algorithms is available from NASA Langley.
    Keywords: COMPUTER PROGRAMMING AND SOFTWARE
    Type: Computing Systems in Engineering (ISSN 0956-0521); 4; 4-6; p. 349-354
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  • 9
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    Linear static structural and vibration analysis on high-performance computers (1993)
    In:  Other Sources
    Details
    Publication Date: 2019-04-02
    Description: Parallel computers offer the oppurtunity to significantly reduce the computation time necessary to analyze large-scale aerospace structures. This paper presents algorithms developed for and implemented on massively-parallel computers hereafter referred to as Scalable High-Performance Computers (SHPC), for the most computationally intensive tasks involved in structural analysis, namely, generation and assembly of system matrices, solution of systems of equations and calculation of the eigenvalues and eigenvectors. Results on SHPC are presented for large-scale structural problems (i.e. models for High-Speed Civil Transport). The goal of this research is to develop a new, efficient technique which extends structural analysis to SHPC and makes large-scale structural analyses tractable.
    Keywords: COMPUTER PROGRAMMING AND SOFTWARE
    Type: Computing Systems in Engineering (ISSN 0956-0521); 4; 4-6; p. 383-371
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  • 10
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    Production and quality assurance automation in the Goddard Space Flight Center Flight Dynamics Facility (1994)
    In:  CASI
    Details
    Publication Date: 2019-06-28
    Description: The Flight Dynamics Facility (FDF) at the NASA Goddard Space Flight Center (GSFC) generates numerous products for NASA-supported spacecraft, including the Tracking and Data Relay Satellites (TDRS's), the Hubble Space Telescope (HST), the Extreme Ultraviolet Explorer (EUVE), and the space shuttle. These products include orbit determination data, acquisition data, event scheduling data, and attitude data. In most cases, product generation involves repetitive execution of many programs. The increasing number of missions supported by the FDF has necessitated the use of automated systems to schedule, execute, and quality assure these products. This automation allows the delivery of accurate products in a timely and cost-efficient manner. To be effective, these systems must automate as many repetitive operations as possible and must be flexible enough to meet changing support requirements. The FDF Orbit Determination Task (ODT) has implemented several systems that automate product generation and quality assurance (QA). These systems include the Orbit Production Automation System (OPAS), the New Enhanced Operations Log (NEOLOG), and the Quality Assurance Automation Software (QA Tool). Implementation of these systems has resulted in a significant reduction in required manpower, elimination of shift work and most weekend support, and improved support quality, while incurring minimal development cost. This paper will present an overview of the concepts used and experiences gained from the implementation of these automation systems.
    Keywords: QUALITY ASSURANCE AND RELIABILITY
    Type: Third International Symposium on Space Mission Operations and Ground Data Systems, Part 1; p 509-516
    Format: application/pdf
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