Results 331 to 340 of about 591,139 (353)

Low Earth Orbits (LEO)

2010 20th International Crimean Conference "Microwave & Telecommunication Technology", 2010
The handheld portable satellite phones, semifixed satellite payphones and remote offices including Satellite Broadband, Satellite Asset Tracking and Fleet Management (SATFM), Satellite Supervisory Control and Data Acquisition (SCADA) or Machine-to-Machine (M2M) monitoring, control, command and logistics system are a very new communications tools ...
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The Radiation Environment in Low-Earth Orbit

Radiation Research, 1997
The radiation environment in low-Earth orbit is a complex mixture of galactic cosmic radiation, particles of trapped belts and secondary particles generated in both the spacecraft and Earth's atmosphere. Infrequently, solar energetic particles are injected into the Earth's magnetosphere and can penetrate into low-Earth orbiting spacecraft.
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Electromagnetic Launch to Low Earth Orbit [PDF]

42nd AIAA/ASME/SAE/ASEE Joint Propulsion Conference & Exhibit, 2006
*Using rocket technology, t he cost of climbing out of the ea rth’s gravity well is considerable. While this type of launch is required for soft payloads such as humans, it may not be the only means to achie ve orbit for G -hardened materiel . Many launch techniques based on a range of gun technologies have been explored.
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Optimal Low-Earth-Orbit-Geostationary-Earth-Orbit Intermediate Acceleration Orbit Transfer

Journal of Guidance, Control, and Dynamics, 1997
The problem of minimum-time orbit transfer using intermediate acceleration is analyzed using both precision integrationand averaging. Continuousconstantaccelerationsoftheorderof10 i 2 gareconsideredforapplications using nuclear propulsion upper stages.
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Habitability Tests in Low Earth Orbit

2020
The science case for Mars in Planetary Research is mainly driven by the following questions: (1) is Mars habitable? (2) Could we be able to detect extant and/or extinct life on Mars? (3) Do biomolecules exist to be relevant biosignatures to look for on Mars?
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LET Spectra in Low Earth Orbit

IEEE Transactions on Nuclear Science, 1986
The Trapped Ions in Space (TRIS) experiment was flown on the Space Shuttle in October, 1984. It contained a stack of plastic track detectors that recorded linear energy transfer (LET) spectra behind various thicknesses of shielding in a 57 degree inclination orbit.
James H. Adams, Allan J. Tylka, B. Stiller   +2 more
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Beyond low earth orbit. An overview of orbit-to-orbit stages

Acta Astronautica, 1986
New developments in upper stages are discussed. Tables revealing the dimensions, engine types, total thrust, weight, payload, and sponsor for developed and planned upper stages compatible with Space Transportation System (STS) or expendable launch vehicles are presented.
Warren L. Brasher, Joseph P. Loftus
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Radar observations in low Earth orbit

Advances in Space Research, 1997
Abstract This paper presents an overview on radar techniques for the observation of space debris in low Earth orbits which were developed at FGAN in the frame of DARA and ESA/ESOC study contracts for the employment of the Tracking and Imaging Radar (TIRA) system in the past five years.
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Performance of a BGO detector in low Earth orbit

IEEE Transactions on Nuclear Science, 1991
A 7.6-cm*7.6-cm BGO (bismuth germanate) detector was flown in the middeck of the Space Shuttle Columbia August 8-13, 1989, as part of the Shuttle Activation Monitor (SAM) experiment. One of the goals of this experiment was to compare the performance of the BGO to that of NaI in the same environment.
D.C. Camp, T.A. Ballard, C.S. Dyer, A.G. Wesisenberger, P.S. Haskins, A. V. Ramayya, P.R. Truscott, D.W. Ely, J.E. McKisson, R.B. Piercey   +9 more
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Launch vehicles to low-Earth orbit

Space Policy, 1987
Abstract The author examines figures for various designs of space launchers, including launch costs and development costs, in order to facilitate an informed choice between expendable, partially reusable and fully reusable launchers.
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