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  • 1
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    Radio continuum and far-infrared observations of low surface brightness galaxies (1994)
    In:  Other Sources
    Details
    Publication Date: 2011-08-24
    Description: We present Very Large Array (VLA) radio continuum and Infrared Astronomy Satellite (IRAS) far-infrared (FIR) observations of 16 low luminosity galaxies of mostly low surface brightness. All galaxies had previously claimed single dish radio continuum detections. However, at the frequencies of our observations (1.49 and 8.48 GHz), we find significant radio emission for two objects only. We show that the other previously claimed detections are due to confusion with physically unrelated background sources. This implies a low radio continuum detection rate for these galaxies. Re-reduced IRAS scans yield significant far-infrared flux densities in at least one IRAS band for 6 of the 16 galaxies. These, together with the FIR and radio continuum upper limits, are consistent with the well established radio/FIR relation, where most of our galaxies populate the low-luminosity end. From the radio continuum and FIR flux densities and their upper limits we estimate the current star formation rates and demonstrate that the galaxies are currently passive in forming stars, in agreement with previous optical investigations. There is an indication that the galaxies were forming stars more intensively averaged over their lifetime than they are presently.
    Keywords: ASTROPHYSICS
    Type: The Astronomical Journal (ISSN 0004-6256); 108; 2; p. 446-455
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  • 2
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    Science Data Center concepts for moderate-sized NASA missions (1991)
    In:  Other Sources
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    Publication Date: 2011-08-24
    Description: The paper describes the approaches taken by the NASA Science Data Operations Center to the concepts for two future NASA moderate-sized missions, the Orbiting Solar Laboratory (OSL) and the Tropical Rainfall Measuring Mission (TRMM). The OSL space science mission will be a free-flying spacecraft with a complement of science instruments, placed in a high-inclination, sun synchronous orbit to allow continuous study of the sun for extended periods. The TRMM is planned to be a free-flying satellite for measuring tropical rainfall and its variations. Both missions will produce 'standard' data products for the benefit of their communities, and both depend upon their own scientific community to provide algorithms for generating the standard data products.
    Keywords: DOCUMENTATION AND INFORMATION SCIENCE
    Type: In: AIAA(NASA International Symposium on Space Information Systems, 2nd, Pasadena, CA, Sept. 17-19, 1990, Proceedings. Vol. 1 (A93-19048 05-82); p. 159-165, 167-183.
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  • 3
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    Scorpius XR-1 - Some X-ray and optical observations /1969 May/ (1970)
    In:  Other Sources
    Details
    Publication Date: 2011-08-16
    Description: Simultaneous X ray and optical observations of Scorpius XR-1, comparing rocket data from various flights
    Keywords: SPACE RADIATION
    Type: ; ATA U., BULLETIN (
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  • 4
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    Observation of several X-ray sources in 1970 September. (1972)
    In:  Other Sources
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    Publication Date: 2011-08-16
    Description: Position and intensity measurements made with proportional counters in the 2 to 12 keV band are described. The instruments were launched from Johnson Atoll, and four scans were carried out during the 525 sec spent above 200 km. In comparing the results with the Uhuru survey, only a few differences are noted. One variable source, 2U 1908+0, was weaker. The case of the Magellanic Cloud sources is discussed.
    Keywords: SPACE RADIATION
    Type: Astrophysical Journal; 176; Sept. 15
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  • 5
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    Use of remote sensing in facility siting (1978)
    In:  Other Sources
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    Publication Date: 2011-08-17
    Description: Environmental parameters important to, and necessary for, an environment impact assessment in terms of site selection for an electric power plant are defined. Remote sensing techniques and/or instrumentation applicable to site evaluation are described. Problem areas are discussed and recommendations given.
    Keywords: EARTH RESOURCES AND REMOTE SENSING
    Type: Appl. of Remote Sensing to the Chesapeake Bay Reg.; p 303-309
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  • 6
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    LANDSAT sensors (1978)
    In:  Other Sources
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    Publication Date: 2011-08-17
    Description: LANDSAT 1, launched in July 1972, and LANDSAT 2, launched in January 1975, are equipped with a similar complement of sensors. Each spacecraft has both a return beam vidicon camera system and a multispectral scanner for acquiring high resolution multispectral data of the Earth's surface on a global basis. A description is given of these imaging systems and the primary sensors on the LANDSAT 1 and 2 spacecraft.
    Keywords: EARTH RESOURCES AND REMOTE SENSING
    Type: Appl. of Remote Sensing to the Chesapeake Bay Reg.; p 123-140
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  • 7
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    Advanced composite applications for sub-micron biologically derived microstructures (1991)
    In:  CASI
    Details
    Publication Date: 2013-08-31
    Description: A major thrust of advanced material development is in the area of self-assembled ultra-fine particulate based composites (micro-composites). The application of biologically derived, self-assembled microstructures to form advanced composite materials is discussed. Hollow 0.5 micron diameter cylindrical shaped microcylinders self-assemble from diacetylenic lipids. These microstructures have a multiplicity of potential applications in the material sciences. Exploratory development is proceeding in application areas such as controlled release for drug delivery, wound repair, and biofouling as well as composites for electronic and magnetic applications, and high power microwave cathodes.
    Keywords: COMPOSITE MATERIALS
    Type: NASA, Washington, Technology 2001: The Second National Technology Transfer Conference and Exposition, Volume 2; p 469-479
    Format: application/pdf
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  • 8
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    NASA's Pilot Land Data System development program (1985)
    In:  Other Sources
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    Publication Date: 2019-06-28
    Description: The NASA Pilot Land Data System (PLDS) project is intended to enhance the effectiveness of data processing capabilities used by researchers applying remote sensing data in land science research. Two sites in the centerminous U.S. have been selected as study areas scanned by Landsat, Nimbus and GOES instruments. The data will be analyzed by teams of researchers representing different fields of expertise. The PLDS program will explore data management, networking and communications, system access capabilities, land analysis software, special processes and overall systems engineerng. The data will be processed by researchers working interactively through remote supermicrocomputer workstations using a variety of operating systems and on-site software capabilities.
    Keywords: EARTH RESOURCES AND REMOTE SENSING
    Type: IAF PAPER 85-102
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  • 9
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    STARDUST: Implementing a New Manage-to-Budget Paradigm (2000)
    In:  Other Sources
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    Publication Date: 2018-06-08
    Description: STARDUST is the Discovery Program's fourth mission, selected from a field of 28 original proposals.
    Type: International Conference on Low Cost Planetary Missions; Baltimore, MD; United States
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  • 10
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    Some effects of thermal-cycle-induced deformation in rocket thrust chambers (1981)
    In:  CASI
    Details
    Publication Date: 2019-06-28
    Description: The deformation process observed in the hot gas side wall of rocket combustion chambers was investigaged for three different liner materials. Five thrust chambers were cycled to failure by using hydrogen and oxygen as propellants at a chamber pressure of 4.14 MN/cu m. The deformation was observed nondestructively at midlife points and destructively after failure occurred. The cyclic life results are presented with an accompanying discussion about the problems of life prediction associated with the types of failures encountered in the present work. Data indicating the deformation of the thrust chamber liner as cycles are accumulated are presented for each of the test thrust chambers. From these deformation data and observation of the failure sites it is evident that modeling the failure process as classic low cycle thermal fatigue is inadequate as a life prediction method.
    Keywords: SPACECRAFT PROPULSION AND POWER
    Type: NASA-TP-1834 , E-553
    Format: application/pdf
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