+ 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 > Vinh, N. X. [x] Sort results by: NASA Center | Date Added to NTRS | Publication Year There are a total of 55 record(s) matching your query. Sorted by: Date Added To NTRS in Descending order Prev 1 2 3 4 5 6  Optimal trajectories in atmospheric flight Author(s): Vinh, N. X. Abstract: Aspects of optimization theory and switching theory are discussed, taking into account the necessary conditions for extrema, a solution subject to constraints, the calculus of variations, the Pontryagin maximum principle, ... NASA Center: NASA (non Center Specific) Publication Year: 1981 Added to NTRS: 2004-11-03 Accession Number: 81A47517; Document ID: 19810063113 Optimal singular control with applications to trajectory optimization Author(s): Vinh, N. X. Abstract: A comprehensive discussion of the problem of singular control is presented. Singular control enters an optimal trajectory when the so called switching function vanishes identically over a finite time interval. Using the ... NASA Center: NASA (non Center Specific) Publication Year: 1977 Added to NTRS: 2004-11-03 Accession Number: 78N20155; Document ID: 19780012212; Report Number: NASA-CR-156135 Nonlinear longitudinal dynamics of an orbital lifting vehicle Author(s): Dobrzelecki, A. J.; Vinh, N. X. Abstract: Thrusting lifting orbital vehicle nonlinear longitudinal dynamics in near-circular orbit, deriving orbital elements variation behavior and angle of attack mode period and damping NASA Center: NASA (non Center Specific) Publication Year: 1971 Added to NTRS: 2004-11-03 Accession Number: 71A40094; Document ID: 19710059397 Satellite dynamics about a planet with a narrow ring Author(s): Scheeres, D. J.; Vinh, N. X. Abstract: The dynamics of a satellite attracted by a planet with a ring are investigated. A single model for the gravitational potential of a ring is used which extracts the fundamental gravitational effects on a satellite. Analytical ... NASA Center: Jet Propulsion Laboratory Publication Year: 1993 Added to NTRS: 2004-11-03 Accession Number: 95A81389; Document ID: 19950049790 Recurrence formulae for the Hansen's developments. Author(s): Vinh, N. X. Abstract: Recurrence formulas for calculating Fourier expansions in elliptic motion in terms of eccentric and mean anomaly NASA Center: NASA (non Center Specific) Publication Year: 1969 Added to NTRS: 2004-11-03 Accession Number: 69A39342; Document ID: 19690061353; Report Number: AIAA PAPER 69-910 Prev 1 2 3 4 5 6  + 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