Results 31 to 40 of about 132,411 (300)
Frontiers in Physiology, 2019 Spontaneous changes in gravity play a significant role in interplanetary space missions. To preserve the astronauts’ capability to execute mission-critical tasks and reduce the risk of injury in transit and on planetary surfaces, a comprehensive ...
Ramona Ritzmann +5 more
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Aerosol deposition in the human lung in reduced gravity. [PDF]
J Aerosol Med Pulm Drug Deliv, 2014 The deposition of aerosol in the human lung occurs mainly through a combination of inertial impaction, gravitational sedimentation, and diffusion. For 0.5- to 5-μm-diameter particles and resting breathing conditions, the primary mechanism of deposition in the intrathoracic airways is sedimentation, and therefore the fate of these particles is markedly ...
Darquenne C.
europepmc +4 more sources
Low-velocity granular drag in reduced gravity [PDF]
Physical Review E, 2011 We probe the dependence of the low velocity drag force in granular materials on the effective gravitational acceleration (geff) through studies of spherical granular materials saturated within fluids of varying density. We vary geff by a factor of 20, and we find that the granular drag is proportional to geff, i.e., that the granular drag follows the ...
Costantino, D. J. +3 more
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Applied Sciences, 2018 This paper presents the design of a legged robot with gecko-mimicking mechanism and mushroom-shaped adhesive microstructure (MSAMS) that can climb surfaces under reduced gravity.
Zhongyuan Wang +3 more
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Turning on gravity with the Higgs mechanism [PDF]
, 2016 We investigate how a Higgs mechanism could be responsible for the emergence of gravity in extensions of Einstein theory. In this scenario, at high energies, symmetry restoration could “turn off” gravity, with dramatic implications for cosmology and ...
Alexander, S, Barrow, J, Magueijo, JCR
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Hamiltonians for Reduced Gravity
, 1997 A generalised canonical formulation of gravity is devised for foliations of spacetime with codimension $n_ge1$. The new formalism retains n-dimensional covariance and is especially suited to 2+2 decompositions of spacetime. It is also possible to use the generalised formalism to obtain boundary contributions to the 3+1 Hamiltonian.
Grant, JDE, Moss, IG
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Applied Sciences, 2022 The present analysis addresses the impact of reduced gravity and magnetohydrodynamics on oscillating mixed-convective electricallyconducting fluid flow over a thermal, non-conducting horizontal circular cylinder.
Zia Ullah +3 more
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Experimental study on two-phase gas-liquid flow patterns at normal and reduced gravity conditions [PDF]
, 2001 Experimental studies have been performed for horizontal two-phase air-water flows at normal and reduced gravity conditions in a square cross-section channel.
赵建福 +4 more
core +1 more source
Flight mechanics experiment onboard nasa’s zero gravity aircraft
Journal of Technology and Science Education, 2012 This paper presents a method to promote STEM (Science, Technology, Engineering, and Mathematics) education through participation in a reduced gravity program with NASA (National Aeronautics and Space Administration).
Kyle R. Matthews +3 more
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The effects of reduced-gravity on planetary rover mobility
The International Journal of Robotics Research, 2020 One of the major challenges faced by planetary exploration rovers today is the negotiation of difficult terrain, such as fine granular regolith commonly found on the Moon and Mars. Current testing methods on Earth fail to account for the effect of reduced gravity on the soil itself.
Niksirat, Parna +2 more
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