Results 261 to 270 of about 80,869 (314)
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American Journal of Physical Medicine & Rehabilitation, 2007
The weightless environment of space imposes specific physiologic adaptations on healthy astronauts. On return to Earth, these adaptations manifest as physical impairments that necessitate a period of rehabilitation. Physiologic changes result from unloading in microgravity and highly correlate with those seen in relatively immobile terrestrial patient ...
Guy Trudel +2 more
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The weightless environment of space imposes specific physiologic adaptations on healthy astronauts. On return to Earth, these adaptations manifest as physical impairments that necessitate a period of rehabilitation. Physiologic changes result from unloading in microgravity and highly correlate with those seen in relatively immobile terrestrial patient ...
Guy Trudel +2 more
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Anemia and Erythropoietin in Space Flights
Seminars in Nephrology, 2005Since the very early manned missions in space, a state of anemia associated with reduced erythropoietin levels and reduced plasma volume was disclosed. The reduction in red blood cell mass is driven by a process of selective hemolysis, which has been named neocytolysis. This phenomenon also occurs in people living at a high altitude who descend rapidly
DE SANTO NG +9 more
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Journal of Jet Propulsion, 1957
Table 1 Fusion reactions 1) D -f D -+ He + n + 3.25 Mev 2) D + D — T + p + 4 Mev 3) T + D -» He + n + 17.6 Mev 4) He + D -> He + p + 18.3 Mev 5) Li« + D _^ 2He + 22.4 Mev 6) Li + p — 2He + 17.3 Mev S research proj ects on nuclear fusion are under way in this country and, no doubt, similar efforts are taking place elsewhere in the world.
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Table 1 Fusion reactions 1) D -f D -+ He + n + 3.25 Mev 2) D + D — T + p + 4 Mev 3) T + D -» He + n + 17.6 Mev 4) He + D -> He + p + 18.3 Mev 5) Li« + D _^ 2He + 22.4 Mev 6) Li + p — 2He + 17.3 Mev S research proj ects on nuclear fusion are under way in this country and, no doubt, similar efforts are taking place elsewhere in the world.
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Space Policy, 1994
Abstract Estimates of the cost of human space flight continue to generate controversy in the effort to set US space policy. Estimates vary widely, depending upon the position of the observer. This article identifies the real cost of major space flight programs and traces the heterofore unsuccessful efforts to cut the expense of space operations.
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Abstract Estimates of the cost of human space flight continue to generate controversy in the effort to set US space policy. Estimates vary widely, depending upon the position of the observer. This article identifies the real cost of major space flight programs and traces the heterofore unsuccessful efforts to cut the expense of space operations.
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Cardiovascular function in space flight
Acta Astronautica, 1991Changes in orthostatic heart rate have been noted universally in Soviet and U.S. crewmembers post space flight. The magnitude of these changes appears to be influenced by mission duration, with increasing orthostatic intolerance for the first 7-10 days of flight and then a partial recovery in the orthostatic heart rate response.
Arnauld Nicogossian +4 more
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Cardiovascular physiology in space flight
Experimental Gerontology, 1991The effects of space flight on the cardiovascular system have been studied since the first manned flights. In several instances, the results from these investigations have directly contradicted the predictions based on established models. Results suggest associations between space flight's effects on other organ systems and those on the cardiovascular ...
Michael W. Bungo, John B. Charles
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The endocrine system in space flight
Acta Astronautica, 1988Hormones are important effectors of the body's response to microgravity in the areas of fluid and electrolyte metabolism, erythropoiesis, and calcium metabolism. For many years antidiuretic hormone, cortisol and aldosterone have been considered the hormones most important for regulation of body fluid volume and blood levels of electrolytes, but they ...
Carolyn S. Leach +2 more
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The Journal of the Royal Aeronautical Society, 1966
The First hundred years of the Royal Aeronautical Society have seen nearly all of man's significant achievements in controlled flight by airships, aeroplanes and helicopters. This is hardly surprising, since the Society was formed in 1866, when the time was nearly ripe for such developments to begin.
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The First hundred years of the Royal Aeronautical Society have seen nearly all of man's significant achievements in controlled flight by airships, aeroplanes and helicopters. This is hardly surprising, since the Society was formed in 1866, when the time was nearly ripe for such developments to begin.
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Erythropoietic effects of space flight
Acta Astronautica, 1979Various factors which are important in the regulation of erythropoiesis have been studied in dehydrated mice in the belief that some information would be gained relevant to the erythropoietic effects of space flight. Dehydration reduced the plasma volume and, because changes in red cell volume were minimal, the hematocrit was elevated.
R. D. Lange, C. D. R. Dunn
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The Journal of the Royal Aeronautical Society, 1966
For centuries, scientists and engineers dreamed of going to the moon or the planets, but the more they learned about the problems involved, the more improbable space flight appeared.While there were many difficult questions, the principal problem overshadowing all others was how to propel the vehicle free of the earth's gravitation.When serious ...
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For centuries, scientists and engineers dreamed of going to the moon or the planets, but the more they learned about the problems involved, the more improbable space flight appeared.While there were many difficult questions, the principal problem overshadowing all others was how to propel the vehicle free of the earth's gravitation.When serious ...
openaire +2 more sources