T HE development of rocket .boosters and fuels c,~pable of high orbital payloads, including manned space probes, has drawn attention to the immediate application of biologic studies in the weightless state. The meager evidence available from the dog in Sputnik II encourages us to believe that the 'human organism can endure zero gravity, but complications may arise from prolonged exposure. Atten...

Phase transition in fluids is ubiquitous in nature and has important applications in areas such as the food industry for volatile oils' extraction or in nuclear plants for heat transfer. Fundamentals are hampered by gravity effects on Earth. We used direct imaging to record snapshots of phase separation that takes place in sulfur hexafluoride, SF₆, under weightlessness conditions on the Interna...

The role of gravity in spatial coordinate assignment and the mental representation of space were studiedin three experiments, varying different perceptual cues systematically: the retinal, the visual background, the vestibular, and proprioceptive information. Verbal descriptions of visually presented arrays were required under different head positions (straight/tilt) and under different gravita...

A state of chronic immobility resulting from extended spaceflight, bed rest or paralysis can present severe secondary complications for individuals confronted with long bone cortical fractures that fail to heal. These secondary complications can generally lead to a decreased quality of life and function for these individuals, and may potentially lead to a life-threatening situation. One potenti...

Astronauts' training is conventionally performed in a pool to reproduce weightlessness by exploiting buoyancy which is supposed to reduce the impact of gravity on the body. However, this training method has not been scientifically validated yet, and requires first to study the effects of underwater exposure on motor behavior. We examined the influence of neutral buoyancy on kinematic features o...

The ability to control the distribution of particles in a fluid is generally regarded as factor great importance variety fields (manufacturing processes, biomedical applications, materials engineering and various particle separation cite few). present study considers hitherto not yet addressed situation which solid spherical are dispersed non-isothermal undergoing turbulent vibrationally-induce...