Global ETD Search
Search theses and dissertations gathered from participating repositories worldwide. Every result links back to the library that holds it. No account is needed.
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Showing 1 to 20 of 20 for “"weightlessness"”.
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Assessment of hip fracture risk in astronauts exposed to long-term weightlessness
… was assessed following 0, 6, and 12 months of weightlessness for: 1) the mid-stance phase of gait, and 2) a fall to the side impacting the greater trochanter. Peak applied loading was calculated for Earth and Mars gravity levels using the equations of motion for three-segment models …
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Circularvection and ocular counterrolling in visually induced roll - supine and in weightlessness
Thesis (M.S.)--Massachusetts Institute of Technology, Dept. of Aeronautics and Astronautics, 1980.
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Effects of weightlessness on the vestibulo-ocular reflex in the crew of Spacelab 1
Thesis (B.S.)--Massachusetts Institute of Technology, Dept. of Mechanical Engineering, 1986.
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Validation of a Two-Dimensional Clinostat Design to Provide Functional Weightlessness to Custom Gas Exchange Vessels
<p>Understanding the impacts of microgravity on bacteria is vital for successful long duration space missions. In this environment, bacteria have been shown to become more virulent, more resistant to antibiotics and form more biofilms. To learn more about these phenomena, many experiments must be …
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Functional and morphological responses of human skeletal muscle to resistance and aerobic exercise during simulated weightlessness
The conductor of a large instrumental ensemble is constantly confronted with the task of detecting and correcting rhythm and pitch performance errors in daily rehearsals. The purpose of this investigation was to design a computer-assisted instruction program for error detection skills development …
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Changes in the horizontal angular vestibulo-ocular reflex of SLS-2 space shuttle astronauts due to weightlessness
Thesis (M.S.)--Massachusetts Institute of Technology, Dept. of Aeronautics and Astronautics, 1995.
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A Novel Resistance Exercise Machine for Use in a Lower Body Negative Pressure Box to Counteract the Effects of Weightlessness
<p>Physiological deconditioning is a critical problem in space, especially during long-term missions. Resistance exercise coupled with lower body negative pressure (LBNP) has been shown to be effective in counteracting some of the deconditioning related problems. This thesis describes the …
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Exercise under artificial gravity - experimental and computational approaches
… during space missions, primarily due to the weightlessness conditions. Some of these adverse consequences include bone loss, muscle atrophy, sensory-motor deconditioning, and cardiovascular adaptation, which may lead to orthostatic intolerance when astronauts are back on Earth. In order to …
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EVENT CLOUDS : lighter than air architectural structures
… air, that covers spaces by floating over them. Weightlessness permits EVENT CLOUD to theoretically cover an infinite surface, overcoming traditional large span structures proper weight limitation. EVENT CLOUD is a non-rigid aerodynamic balloon that can act as a fixed roof that does not overload …
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The Third Side of the Coin
… and the light, and that bridges the gravity and weightlessness of our existence.
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Incremental adaptation to yaw head movements during 30 RPM centrifugation
… the harmful physiological effects of prolonged weightlessness. However, the vestibular stimulus associated with making head movements while rotating presents a challenge. During a head movement, the semicircular canals are excited by a cross-coupled angular acceleration, resulting in tumbling …
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Effect of space conditions on neuronal plasticity and connectivity
… human space flight, it has been observed that in weightlessness conditions, equilibrium sense organs can send misleading inputs to the central nervous system which is forced to develop new strategies and adapt to adequately translate these messages. Furthermore, cosmic radiations are known to …
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Artificial gravity : changing the intensity of coriolis cross-coupled stimulus with head-angle
… associated with prolonged exposure to weightlessness. Unfortunately, head-movements in a rotating environment create Coriolis cross-coupled stimuli that introduce problematic vestibular responses. Earlier studies have shown that it is possible to achieve at least partial adaptation to …
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Cross plane transfer of vestibular adaptation to human centrifugation
… the deleterious effects of long exposures to weightlessness. Rotation rates on short radius centrifuges are high to provide the needed g-loading, and therefore entail a variety of unusual vestibular stimuli when certain head movements are made. Since these movements can elicit inappropriate …
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Fluctuations, Phase Separation and Wetting Films near Liquid-Gas Critical Point
… a number of experiments were performed in the weightlessness of Mir space station. The experimental setup called ALICE II instrument was designed to suppress sedimentation and buoyancy-driven flow. Another set of experiments were carried out on Earth using a carefully density matched system of …
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Neural Mechanisms of Motor Imagery and Training-Induced Plasticity: Hypnotizability Relevance to Microgravity Adaptation
… as microgravity during spaceflights, induces weightlessness-related physiological alteration regarding sensory information, sensorimotor integration, and interoceptive and vestibular feedback disruption. Such alterations impair postural control, spatial orientation, and fine motor skills. …
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The Effect of Hypergravity (2g) on Osteoblast Precursor Cells in the Periodontal Ligament of the Rat
The effect of weightlessness on bone and osteoblast precursor cells has previously been studied. A marked decrease in bone formation, an increase in less differentiated committed osteogenic cells (A+A'), and a decrease in preosteoblast cells (C+D) was noted. To date, the effect of hypergravity (2g) …
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Development of the West Virginia University Small Microgravity Research Facility (WVU SMiRF)
… reduced gravity or microgravity (i.e. "weightlessness") during free fall. Currently, there are several methods for conducting scientific research in microgravity including drop towers, parabolic flights, sounding rockets, suborbital flights, NanoSats, CubeSats, full-sized satellites, …
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Effects of Spaceflight on Phagocytic Function and Immune-Neural Interaction
<p>In spaceflight, astronauts will be exposed to several environmental risk factors that may lead to disturbances in homeostasis maintained by the central nervous system (CNS) and immune system. Low Earth orbit (LEO) spaceflight studies have shown that microgravity changes virtually all immune …