Results 211 to 220 of about 47,904 (244)
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Human Factors: The Journal of the Human Factors and Ergonomics Society, 2022
Objective The objective is to analytically determine the expected CG and build hardware to measure and verify the suited subject’s CG for lunar extravehicular activity (EVA) training in an underwater environment.
Linh Q. Vu +4 more
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Objective The objective is to analytically determine the expected CG and build hardware to measure and verify the suited subject’s CG for lunar extravehicular activity (EVA) training in an underwater environment.
Linh Q. Vu +4 more
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SIMULATION, 1970
This article covers two partial-gravity simulators being used at the Manned Spacecraft Center to acquaint astronauts with the dynamics of moon walking. The first simulator discussed, the Partial Gravity Simulator (PGS), Figures 7 and 8, is a 5 + degrees-of-freedom simulator built into a 14 x 60 foot room which is 60 feet high.
Harold I. Johnson, Arthur G. Trader
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This article covers two partial-gravity simulators being used at the Manned Spacecraft Center to acquaint astronauts with the dynamics of moon walking. The first simulator discussed, the Partial Gravity Simulator (PGS), Figures 7 and 8, is a 5 + degrees-of-freedom simulator built into a 14 x 60 foot room which is 60 feet high.
Harold I. Johnson, Arthur G. Trader
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Pneumatic Conveying of Materials at Partial Gravity
Journal of Aerospace Engineering, 1992The feasibility of pneumatic transfer for the movement of regolith at a lunar base is evaluated. Operation of pneumatic conveying systems at partial (lunar and Mars) gravity on NASA's KC-135 aircraft allowed the determination of some key parameters necessary for the design of an operable system. Both horizontal and vertical transfer is studied.
THOMAS SULLIVAN +3 more
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Brain Research, 2006
The Mars Gravity Biosatellite will offer investigators a unique environment for sensorimotor research. Fifteen mice will fly for 5 weeks in low Earth orbit before being returned safely to the ground. Chronic 35-rpm rotation will produce artificial gravity equal to that on the surface of Mars (0.38 g).
Erika B, Wagner +1 more
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The Mars Gravity Biosatellite will offer investigators a unique environment for sensorimotor research. Fifteen mice will fly for 5 weeks in low Earth orbit before being returned safely to the ground. Chronic 35-rpm rotation will produce artificial gravity equal to that on the surface of Mars (0.38 g).
Erika B, Wagner +1 more
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The dynamics of steady, partial‐depth intrusive gravity currents
Atmosphere-Ocean, 2008Abstract Experiments of intrusive gravity currents generated by lock exchange offer insights into atmospheric and oceanic flows. However, whereas many previous investigations have considered the full‐depth’ lock exchange problem, in which the intermediate density fluid initially spans the entire channel depth, less is known about ‘partial‐depth ...
P. F. Linden, T. Boubarne, M. R. Flynn
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The Mars Gravity Biosatellite: Thermal Design Strategies for a Rotating Partial Gravity Spacecraft
SAE Technical Paper Series, 2007<div class="htmlview paragraph">A rotating spacecraft which encloses an atmospheric pressure vessel poses unique challenges for thermal control. In any given location, the artificial gravity vector is directed from the center to the periphery of the vehicle.
Thaddeus R. F. Fulford-Jones +5 more
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Impact of Microgravity and Partial Gravity on Cardiac Shape
42nd International Conference on Environmental Systems, 2012The impact of gravitational loading on the cardiac shape is studied numerically through application of two different constitutive models for the cardiac tissue. Transversely isotropic and orthotropic cardiac materials models are incorporated into a finite element heart model that includes a realistic 3D cardiac geometry based on detailed cardiac fiber ...
Ilana Iskovitz +2 more
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Energetics and mechanics for partial gravity locomotion.
Aviation, space, and environmental medicine, 1995The role of gravitational acceleration on human locomotion is not clearly understood. It is hypothesized that the mechanics and energetics of locomotion depend upon the prevailing gravity level. A unique human-rated underwater treadmill and an adjustable ballasting harness were used to stimulate partial gravity environments. This study has two research
D J, Newman, H L, Alexander, B W, Webbon
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Gravity-Driven Laminar Flow in a Partially-Filled Pipe
Chemical Engineering Research and Design, 2001The Boundary Element Method (BEM) is used to evaluate the integral and local flow properties of gravity-driven laminar flow in a partially filled pipe accounting for the correct free surface shape. With the BEM, any interface shape can be specified and only the solution values on the interface are evaluated, minimizing the computational time and ...
T.S. Ng, C.J. Lawrence, G.F. Hewitt
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Gravity, radiation, and coflow effects on partially premixed flames
Physics of Fluids, 2004Our objective is to characterize gravity effects on the structure of laminar methane–air partially premixed flames through detailed simulations. We examine the heat loss due to radiation from similar flames that are established at various gravitational accelerations and coflow velocities.
Qin, Xiao +3 more
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