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  • 1
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    Employment of CB models for non-linear dynamic analysis (1990)
    In:  CASI
    Details
    Publication Date: 2004-12-04
    Description: The non-linear dynamic analysis of large structures is always very time, effort and CPU consuming. Whenever possible the reduction of the size of the mathematical model involved is of main importance to speed up the computational procedures. Such reduction can be performed for the part of the structure which perform linearly. Most of the time, the classical Guyan reduction process is used. For non-linear dynamic process where the non-linearity is present at interfaces between different structures, Craig-Bampton models can provide a very rich information, and allow easy selection of the relevant modes with respect to the phenomenon driving the non-linearity. The paper presents the employment of Craig-Bampton models combined with Newmark direct integration for solving non-linear friction problems appearing at the interface between the Hubble Space Telescope and its solar arrays during in-orbit maneuvers. Theory, implementation in the FEM code ASKA, and practical results are shown.
    Keywords: STRUCTURAL MECHANICS
    Type: NASA. Langley Research Center, The Third Air Force(NASA Symposium on Recent Advances in Multidisciplinary Analysis and Optimization; p 266-275
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  • 2
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    The effect of quenching on the ductile-brittle bend-transition temperature of chromium wire (1966)
    In:  CASI
    Details
    Publication Date: 2006-10-26
    Description: Effect of quenching on ductile-brittle bend transition temperature of chromium wire
    Keywords: MATERIALS, METALLIC
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  • 3
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    The effect of quenching on the ductile-brittle bend-transition temperature of Cr-35Re wire (1966)
    In:  CASI
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    Publication Date: 2006-10-26
    Description: Effect of quenching on ductile-brittle bend transition temperature of Cr-35Re wire
    Keywords: MATERIALS, METALLIC
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  • 4
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    Objectives and first results of the NASA SETI sky survey field tests at Goldstone (1986)
    In:  CASI
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    Publication Date: 2006-02-14
    Description: Field tests of SETI (Search for Extraterrestrial Intelligence) prototype hardware and software began in March 1985 at Goldstone. With emphasis on the sky survey component of the NASA SETI search strategy, the article describes the survey characteristics, the detection strategy, and preliminary results of system tests.
    Keywords: ASTRONOMY
    Type: The Telecommunications and Data Acquisition Report (date]; p 284 - 300
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  • 5
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    Planetary submillimeter spectroscopy (1986)
    In:  CASI
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    Publication Date: 2006-02-14
    Description: A comprehensive observational strategy was developed for the detection and measurement of molecular lines in the millimeter and submillimeter spectra of planetary atmospheres and comets. A sound observational strategy and the associated analytical capability to begin observations from the Caltech Submm Observatory (CSO) on Mauna Kea in FY 87-88. Comet Halley was observed from the NASA-KAO with the dual-frequency (0.8 and 1.6 mm) receiver and conducted a search for NH3 with the DSN 64 m antenna.
    Keywords: ASTRONOMY
    Type: NASA, Washington Reports of Planetary Astronomy, 1985; p 39
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  • 6
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    JPL's role in the SETI program (1986)
    In:  CASI
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    Publication Date: 2006-02-14
    Description: The goal of the JPL SETI Team is to develop the strategies and the instrumentation required to carry out an effective, yet affordable, SETI Microwave Observing Program. The primary responsibility for JPL is the development and implementation of the Sky Survey component of the bimodal search program recommended by the SETI Science Working Group (NASA Technical Paper 2244, 1983). JPL is also responsible for the design and implementation of microwave analog instrumentation (including antenna feed systems, low noise RF amplifiers, antenna monitor and control interfaces, etc.) to cover the microwave window for the Sky Survey and the Target Search observations. The primary site for the current SETI Field Test activity is the Venus Station of the Goldstone Deep Space Communication Complex. A SETI controller was constructed and installed so that pre-programmed and real time SETI monitor and control data can be sent to and from the station controller. This unit will be interfaced with the MCSA. A SETI Hardware Handbook was prepared to describe the various systems that will be used by the project at the Venus Station; the handbook is frequently being expanded and updated. The 65,000 channel FFT Spectrum analyzer in the RFI Surveillance System was modified to permit operation with variable resolutions (300 Hz to less than 1 Hz) and with real-time accumulation, which will enhance the capability of the system for testing Sky Survey search strategies and signal detection algorithms.
    Keywords: SPACE BIOLOGY
    Type: NASA, Washington Second Symposium on Chemical Evolution and the Origin of Life; p 115
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  • 7
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    An assessment of the impact of radiofrequency interference on microwave SETI searches (1992)
    In:  Other Sources
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    Publication Date: 2011-08-24
    Description: Investigations are carried out at JPL on radiofrequency interferences at very low levels (-130 to -180 dBm) in various bands, especially the 1-2 GHz band. Extrapolation of interferences in the years to come is attempted.
    Keywords: Exobiology
    Type: Acta astronautica (ISSN 0094-5765); Volume 26; 3-4; 227-32
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  • 8
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    NASA's Search for Extraterrestrial Intelligence (1988)
    In:  Other Sources
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    Publication Date: 2011-08-24
    Description: No abstract available
    Keywords: Exobiology
    Type: Town hall journal (ISSN 0732-4049); Volume 50; 6; 49-50
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  • 9
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    Status of the NASA SETI Sky Survey microwave observing project (1992)
    In:  Other Sources
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    Publication Date: 2011-08-24
    Description: The Sky Survey observing program is one of two complementary strategies that NASA plans to use in its microwave Search for Extraterrestrial Intelligence (SETI). The primary objective of the Sky Survey is to search the entire sky over the frequency range 1000-10,000 MHz for evidence of narrow band signals of extraterrestrial, intelligent origin. Spectrum analyzers with upwards of 10 million channels and data rates in excess of 10 gigabits per second are required to complete the survey in less than 7 years. To lay the foundation for the operational SETI Sky Survey, a prototype system has been built to test and refine real time signal detection algorithms, to test scan strategies and observatory control functions, and to test algorithms designed to reject radio frequency interference. This paper presents a high level description of the prototype hardware and reports on the preparations to deploy the system to the 34-m antenna at the research and development station of NASA's Deep Space Communication Complex, Goldstone, California.
    Keywords: SPACE SCIENCES (GENERAL)
    Type: Acta Astronautica (ISSN 0094-5765); 26; 3-4,
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  • 10
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    International Jupiter Watch - A program to study the time variability of the Jovian system (1990)
    In:  Other Sources
    Details
    Publication Date: 2011-08-19
    Description: The International Jupiter Watch is a program for the encouragement and coordination of the study of temporal variations in the Jovian system. It consists of six discipline working groups concerned with: the Io torus under N. Schneider; the Jovian atmosphere under R. West; the magnetosphere and radio emissions under I. de Peter and M. Klein; aurora under J. Caldwell; the Galilean satellites under W. Sinton and J. Goguen; and laboratory measurement and theory under B. Lutz. To date the IJW has held two workshops and selected several Jupiter Watch periods for coordinated observations. The next Jupiter Watch workshop is tentatively scheduled for 1990 in association with the next COSPAR meeting.
    Keywords: LUNAR AND PLANETARY EXPLORATION
    Type: Advances in Space Research (ISSN 0273-1177); 10; 1, 19
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