Results 81 to 90 of about 852,392 (209)
Mission and space vehicle sizing data for a chemical propulsion/aerobraking option [PDF]
Sizing data is presented for various combinations of Mars missions and chemical-propulsion/aerobraking vehicles. Data is compared for vehicles utilizing opposition (2-year mission) and conjunction (3-year mission) trajectories for 1999 and 2001 ...
Brothers, Bobby, Butler, John
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Space missions to comets [PDF]
The broad impact of a cometary mission is assessed with particular emphasis on scientific interest in a fly-by mission to Halley's comet and a rendezvous with Tempel 2.
Brandt, J. C. +3 more
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Radiation exposure and performance of multiple burn LEO-GEO orbit transfer trajectories [PDF]
Many potential strategies exist for the transfer of spacecraft from low Earth orbit (LEO) to geosynchronous (GEO) orbit. One strategy has generally been utilized, that being a single impulsive burn at perigee and a GEO insertion burn at apogee.
Gorland, S. H.
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Preliminary survey of 21st century civil mission applications of space nuclear power [PDF]
The purpose was to collect and categorize a forecast of civilian space missions and their power requirements, and to assess the suitability of an SP-100 class space reactor power system to those missions.
Hepenstal, A. +2 more
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Preliminary analysis of space mission applications for electromagnetic launchers [PDF]
The technical and economic feasibility of using electromagnetically launched EML payloads propelled from the Earth's surface to LEO, GEO, lunar orbit, or to interplanetary space was assessed.
Conlon, R. J. +3 more
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Saturn orbiter mission study [PDF]
A preliminary analysis of the important aspects of missions orbiting the planet Saturn is provided. Orbital missions to Saturn is given serious consideration for the 1980's, or after flybys by Pioneer 10/G and Mariner Jupiter-Saturn 1977.
Sullivan, R. J., Wells, W. C.
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Civil space technology initiative [PDF]
The Civil Space Technology Initiative (CSTI) is a major, focused, space technology program of the Office of Aeronautics, Exploration and Technology (OAET) of NASA.
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Health care system resilience - Evaluating the effect of the COVID-19 pandemic on emergency medical service demand in Germany: A case study from the city of Jena. [PDF]
PLoS OneBrock J +7 more
europepmc +1 more source