+ 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  + Jet Propulsion Laboratory  + NASA (non Center Specific) + Publication Year + Subject + Item/Media Type Selected Navigations: Author > Harwood, D. [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 Worldwide photometry and lightcurve observations of 16 Psyche during the 1975-1976 apparition Author(s): Tedesco, E. F.; Taylor, R. C.; Drummond, J.; Harwood, D.; Nickoloff, I.; Scaltriti, F.; Zappala, V. Abstract: Twenty-six lightcurves of Psyche are presented together with UBV photometry and phase functions from 1975 and 1976. Combining photometric data from this opposition with those from previous apparitions resulted in a mean ... NASA Center: Jet Propulsion Laboratory Publication Year: 1983 Added to NTRS: 2004-11-03 Accession Number: 83A32604; Document ID: 19830051386 Texture classification by local rank correlation Author(s): Harwood, D.; Subbarao, M.; Davis, L. S. Abstract: A new approach to texture classification based on local rank correlation is proposed here. Its performance is compared with Laws' method which uses local convolution with feature masks. In the experiments, texture samples ... NASA Center: NASA (non Center Specific) Publication Year: 1985 Added to NTRS: 2004-11-03 Accession Number: 86A42018; Document ID: 19860057280 Worldwide photometry and lightcurve observations of 1 Ceres during the 1975-1976 apparition Author(s): Tedesco, E. F.; Taylor, R. C.; Drummond, J.; Harwood, D.; Nickoloff, I.; Scaltriti, F.; Zappala, V.; Schober, H. J. Abstract: Lightcurves and UBV photometry of Ceres from the 1975-1976 apparition are presented. The synodic period is 0.37812 or 0.00004 day, the mean absolute V magnitude is 3.61 or 0.03, and the phase coefficient is 0.040 or - ... NASA Center: Jet Propulsion Laboratory Publication Year: 1983 Added to NTRS: 2004-11-03 Accession Number: 83A32603; Document ID: 19830051385 Simultaneous X-ray, ultraviolet, optical, and radio observations of the flare star Proxima Centauri Author(s): Haisch, B. M.; Slee, O. B.; Siegman, B. C.; Nikoloff, I.; Candy, M.; Harwood, D.; Verveer, A.; Quinn, P. J.; Wilson, I.; Linsky, J. L., et al. Abstract: Results of coordinated program of observations in the X-ray, UV, optical and radio regions of the dM5e flare star Proxima Centauri are presented. Simultaneous observations of the star were obtained on March 6 and March 7, ... NASA Center: NASA (non Center Specific) Publication Year: 1981 Added to NTRS: 2004-11-03 Accession Number: 81A34896; Document ID: 19810050492; Report Number: PB81-248957 + 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