42,081 to 42,090 of 42,141 Results
Dec 1, 1992
Terebey, S.; Chandler, C. J.; Andre, P., 1992, "Millimeter Continuum Measurements of Circumstellar Dust Around Very Young Low Mass Stars", https://hdl.handle.net/2014/34977, Pasadena, California, USA, JPL Open Repository
We investigate the question of disk formation during the protostar phase. We build on the results of Keene and Masson (1990) who analysis of L1551 showed themillimeter continuum emission comes from both an unresolved circumstellar conponent i.e. disk and an extended cloud core. |
Dec 1, 1992
Ahrens, Thomas J.; Harris, Alan W., 1992, "Deflection and Fragmentation of Near-Earth Asteroids", https://hdl.handle.net/2014/36712, Nature, JPL Open Repository
Collisions by near-earth asteroids or the nuclei of comets pose varying levels of threat to man. A relatively small object, approximately 100 m diameter, which might be found on an impact trajectory with a populated region of the Earth, could potentially be diverted with a veloci... |
Dec 1, 1992
Marzwell, N. I.; Lee, H. S.; Ramaswami, R., 1992, "Multi-Beam Range Imager for Autonomous Operations", https://hdl.handle.net/2014/36692, Baltimore, Maryland, USA, JPL Open Repository
For space operations using Space Station Freedom, the real-time range imager will be very valuable in terms of refueling and docking, as well as space exploration. |
Nov 22, 1992
Mathison, R.P., 1992, "Deep Space Network Antennas", https://hdl.handle.net/2014/33396, Cal Tech Campus, Pasadena, California, USA, JPL Open Repository
No abstract provided |
Nov 17, 1992
Bryant, L., 1992, "A MOS for All Seasons", https://hdl.handle.net/2014/36325, Pasadena, California, USA, JPL Open Repository
From a systems perspective, this paper examines the challenges of a single system to support multiple Jet Propulsion Laboratory (JPL) space exploration missions and the need for unitary responsibility for the system. |
Nov 17, 1992
Jr., Charles H. Acton, 1992, "Using the SPICE System to Help Plan and Interpret Space Science Observations", https://hdl.handle.net/2014/36695, Pasadena, CA, JPL Open Repository
A portable multimission information system named SPICE is used to assemble, archive, and provide easy access to viewing and other ancillary information needed by space scientists to interpret observations of bodies within our solar system. The modular nature of this system lends... |
Nov 16, 1992
Fayyad, K.; Cooper, L., 1992, "Representing Operations Procedures Using Temporal Dependency Algorithms", https://hdl.handle.net/2014/36696, Pasadena, California, USA, JPL Open Repository
The research presented in this paper is investigating new ways of specifying operations procedures that incorporate the insight of operations, engineering, and science personnel to improve mission operations. The paper describes the rationale for using Temporal Dependency Network... |
Nov 5, 1992
Dobinson, Elain R., 1992, "User Scientific Data Systems: Experience Report", https://hdl.handle.net/2014/35382, Salt Lake City, Utah, USA, JPL Open Repository
This paper presents an abbreviated history of NASA science data management system development over the past ten years by selecting two case studies, each representative of a distinct era of science data management systems. |
Nov 3, 1992
Haddad, Ziad S.; Im, Eastwood, 1992, "Optimal estimation of rain rate profiles from single-frequency radar echoes.", https://hdl.handle.net/2014/36025, pre-print, JPL Open Repository
The significant ambiguities inherent in the determination of a particular vertical rain intensity profile from a given time profile of radar echo powers measured by a downward-looking (spaceborne or airborne) radar at a single attelluating frequency are well-documented. Indeed, o... |
Nov 1, 1992
Chrisp, Michael P., 1992, "optical Instruments for Remote Sensing from Space", https://hdl.handle.net/2014/35082, Boston, MA, USA, JPL Open Repository
This review covers the optical design of passive remote sensing optical instruments. The review concentrates on the design of spaceborne multispectral cameras and imaging spectometers. The major designs that have been produced over the past ten years are discussed, and new design... |