Investigating the Link Between Outer Radiation Belt Losses and Energetic Electron Escape at the Magnetopause: A Case Study Using Multi‐Mission Observations and Simulations
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SEARCH · Engineering Papers
Search indexed NASA NTRS and DOE OSTI research on propulsion, heat transfer, battery materials and energy systems. Follow report and document links to the original sources.
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Relativistic equations for gravitational collapse of sphere of ideal fluid with subsequent outward neutrino flux
Slide-wire system with a twist level slide device incorporates automatic descent and braking for the safe and rapid evacuation of personnel from tall structures. This device is used on any tall structure that might require emergency evacuation. It is also used to transfer materials and equipment.
Importance of neural site and experimental conditions in determining motivational direction /positive or negative/ produced by electrical stimulation of brain in animals
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Backward and forward photoemission quantum yields from evaporated KBr films measured as function of film thickness
Momentum accomodation coefficients obtained from low velocity molecule-surface interactions, for space probe drag calculations
Animal study showing aversiveness of simulated gravity and importance of separating rotation effects from effects of G forces
Shock tube studies of flow of thermally dissociated oxygen, nitrogen, and carbon dioxide gases through supersonic nozzles
Attenuation length of excited photoelectrons in evaporated potassium bromide films by measuring quantum yield as function of film thickness
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Dayglow O I lambda 1304 and 1356 A radiations photoelectron excitation rates theoretical calculation and experimental data on altitude dependence characteristics
Minimum impulse transfer between circular orbit and hyperbolic trajectory velocity vector, assuming fixed transfer times
Automatic braking device for rapidly transferring humans or materials from elevated location
Papers on the problem of controlling a tumbling spacecraft before crew rescue is affected are presented. Fluid jets are considered; It is concluded that a gas jet results in long tumble times and low utilization efficiencies and a liquid jet appears more attractive because it can be directed. A conceptual design of an unmanned antitumbling module for automatic dock and detumble is formulated, and analyses of its dynamics and control, synthesis of position and attitude control systems, and sequence of operations are given. The minimum time detumble operation is analyzed with respect to (1) to a constraint on the magnitude of the control moment vector and (2) to constraints on the magnitude of each of the three components of the control moment vector. Internal passive and active mechanisms of energy dissipation are also considered. Structural flexibility modelling techniques and detumbling effects of structural flexibility on free-tumbling motion, are reviewed. Mass expulsion, momentum exchange, and moveable mass techniques are described, and methods of analyzing these devices are surveyed.