+ Visit NASA.gov + Contact NASA   + Home Select Search Field * All Report - Patent Number Abstract *Accession Number *NASA Center *Author NameDocument IDKeywordsPublication Date *Title * Find Results With All of the words At least one of the words Enter Search Term  within returned results    Search Tips: Use only the fields with * to search NIX collection. Enclose terms in double quotation marks (") to search for exact phrases, ie: "space shuttle". NOTE: Commas and dashes are removed from search term by search engine. Select Reset Search button to start a new search. See Help for more tips. + NASA Center + Publication Year + Subject + Availability Options + Item/Media Type Selected Navigations: Author > Ho, C. S. [x] Sort results by: NASA Center | Date Added to NTRS | Publication Year There are a total of 4 record(s) matching your query. Sorted by: Date Added To NTRS in Descending order The effect of carbon deposition on accelerator grid wear rates in ion engine ground testing Author(s): Polk, J. E.; Duchemin, O.; Ho, C. S.; Koel, B. E. Abstract: This paper discusses a surface kinetics model of sputtering for a molybdenum surface subject to a flux of carbon atoms and xenon ions. NASA Center: Jet Propulsion Laboratory Publication Year: 2000 Added to NTRS: 2006-12-25 Document ID: 20060033167 CASA Uno GPS orbit and baseline experiments Author(s): Schutz, B. E.; Ho, C. S.; Abusali, P. A. M.; Tapley, B. D. Abstract: CASA Uno data from sites distributed in longitude from Australia to Europe have been used to determine orbits of the GPS satellites. The characteristics of the orbits determined from double difference phase have been ... NASA Center: NASA (non Center Specific) Publication Year: 1990 Added to NTRS: 2004-11-03 Accession Number: 90A31046; Document ID: 19900043991 Accuracy assessment of GPS satellite orbits Author(s): Schutz, B. E.; Tapley, B. D.; Abusali, P. A. M.; Ho, C. S. Abstract: GPS orbit accuracy is examined using several evaluation procedures. The existence is shown of unmodeled effects which correlate with the eclipsing of the sun. The ability to obtain geodetic results that show an accuracy of ... NASA Center: NASA (non Center Specific) Publication Year: 1991 Added to NTRS: 2004-11-03 Accession Number: 91A47651; Document ID: 19910063028 Improving the numerical integration solution of satellite orbits in the presence of solar radiation pressure using modified back differences Author(s): Lundberg, J. B.; Feulner, M. R.; Abusali, P. A. M.; Ho, C. S. Abstract: The method of modified back differences, a technique that significantly reduces the numerical integration errors associated with crossing shadow boundaries using a fixed-mesh multistep integrator without a significant ... NASA Center: Goddard Space Flight Center Publication Year: 1991 Added to NTRS: 2004-11-03 Accession Number: 93A17967; Document ID: 19930033970; Report Number: AAS PAPER 91-187 + Back to Top + Sponsored by the NASA Scientific and Technical    Information Program + 2004 Vision for Space Exploration + Freedom of Information Act + NASA Web Privacy Policy and Important Notices + NASA Disclaimers, Copyright Notice,    and Terms and Conditions of Use NASA Official: Calvin Mackey Page Curator: NASA Center for AeroSpace Information (help@sti.nasa.gov) Last Updated: July 5, 2007