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 137 for “"astronauts"”.
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My Mother and Father Were Astronauts
In these lyric-narrative poems, the speaker is under constant threat of violence, trouble, danger, or death, but that death is never realized. Rather, the speaker, much like many of the lives in the desert, not only survives amidst the constant threat of violence, but flourishes because of it; the …
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Understanding vertebral fracture risk in astronauts
… vertebral trabecular bone loss in long-duration astronauts. Thus trunk muscle and vertebral bone changes and their impact on risk of injury following long-duration spaceflight remain unknown. This is of particular concern for NASA's planned Mars missions and return to Earth after prolonged …
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Sensorimotor disturbances in astronauts following space flight: Causes, evaluation, and countermeasures
Spaceflight induces a myriad of changes on the physiology of the human body. A cumulative result of many of these changes is sensorimotor dysfunction whereby small movements at the head level may lead to an exaggerated sense of movement. An astronaut’s activities of daily living are directly …
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Assessment of hip fracture risk in astronauts exposed to long-term weightlessness
… 10 years. During the 6 to 12 month journey astronauts would likely lose bone mineral density (BMD) at a mean rate of 1-2 percent per month in weight-bearing areas, approximately 10 times the rate associated with normal ageing. There exists an important need to quantify the fracture risk …
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The Effectiveness of Augmented Reality for Astronauts on Lunar Missions: An Analog Study
… development has begun in the space sector for astronauts using these head-up displays. Future lunar missions could incorporate augmented reality for astronauts to ease task load and improve accuracy. This study evaluated the usability, subjective workload, and task performance of 22 …
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Gumball Astronauts: Establishing a Space-Time Vocabulary for Genre Bending in Picture Stories
<p>This paper attempts to redefine genre as a set of bodily experiences rather than a collection of thematic objects. Beginning with the western genre as a whole and ending with my own comics work, I pull apart elements within specific narratives and analyze them as mechanical divides that disrupt …
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Microgravity induced changes in horiztonal vestibulo-ocular reflexes of SLS-1 & SLS-2 astronauts
Thesis (M. Eng.)--Massachusetts Institute of Technology, Dept. of Electrical Engineering and Computer Science, 1997.
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Identification Of Psychological Stressors For Long Duration Space Missions: Psychological Stressors Among Five Astronauts And Cosmonauts
… the question of how stressors may affect future astronauts and cosmonauts, the evolutoinary reasons behind stress must be considered not only the type and intensity of the stressors.</p> <p>Five astronauts and cosmonauts representing three space agencies were surveyed regarding their experiences …
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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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Measurement of accelerations experienced by rough stock riders: A model for examining acceleration-induced head injuries in astronauts
… for injuries due to repetitive acceleration is astronauts. The Russian Soyuz spacecraft can expose astronauts to high accelerative forces during re-entry and up to 10 G during ballistic re-entry. Soyuz landing impact has reached 17 G. The new NASA Aries launch vehicle is predicted to experience …
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The Design, development, and analysis of a wearable, multi-modal information presentation device to aid astronauts in obstacle avoidance during surface exploration
The future of human space exploration will involve extra-vehicular activities (EVA) on foreign planetary surfaces (i.e. Mars), an activity that will have significantly different characteristics than exploration scenarios on Earth. These activities become challenging due to restricted vision and …
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Finger Exoskeleton – Towards an EVA Exoskeleton Hand Analysis, Modelling, Design and Implementation
… Vehicular Activity) is an operation done by astronauts away from the Earth, and outside of a spacecraft, using a spacesuit that is composed by a complex and highly technological multi-layer structure designed to protect the astronauts from several factors due to the outer hostile environment. …
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Reentry
… the runway and rolling to a halt. By then, the astronauts' job is finished. The hard part is over. Adjusting after six months in space - or even two weeks - should be a snap. But there's more to coming home than landing on solid ground. This thesis presents the little-known story of what happens …
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Extra-terrestrial nuclear power stations : transportation and operation
… safety, deployment, control, and protecting the astronauts from radiation. Examples from the past provide guidance in these areas but surface operations on another body have never been attempted and rarely studied. This thesis discusses the risks and design considerations for launching, …
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Utilizing Permanent On-Board Water Storage for Efficient Deep Space Radiation Shielding
… rapidly, there is a common desire to launch astronauts beyond the ISS to return to the Moon and put human footsteps on Mars. One of the largest hurdles that still needs to be addressed is the protection of astronauts from the radiation environment seen in deep space. The most effective way to …
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Development of astronaut reorientation methods : a computational and experimental study
Past spaceflight missions have shown that astronauts adapt their motor-control strategies to the microgravity environment. Even though astronauts undergo hundreds of training hours, the strategies for locomotion and orientation are not specifically prescribed. The majority of an astronaut's …
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Simulating Apollo: Flight Simulation Technology 1945-1975
… simulation – the engineers, the test pilots, the astronauts, the flight controllers – who utilized the new capability of simulation as prediction machines to design flight vehicles and anticipate how they will perform increasingly complex missions. This dissertation explores the influence of …
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MICROGRAVITY NEGATIVELY AFFECTS DNA DAMAGE REPAIR AND THE ANTI-LEUKEMIC FUNCTION OF HUMAN NATURAL KILLER CELLS
Future manned deep space missions will expose astronauts to galactic cosmic ray (GCR) radiation and solar energetic particles (SEPs) not present on Earth. The hematopoietic system constitutes one of the most radiosensitive tissues of the body and leukemias represent one of the most frequent …
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Active Magnetic Radiation Shielding For Long-Duration Human Spaceflight
… <p>fluence rate and radiation dose to astronauts behind the shield.</p> <p>This project developed a model for determining the effectiveness of active</p> <p>magnetic shielding in reducing radiation dose to astronauts on an interplanetary</p> <p>mission. This research includes Monte …
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Influence of spatial orientation and spatial visualization abilities on space teleoperation performance
Astronauts perform space teleoperation tasks with visual feedback from outside cameras. Individuals differ greatly in the ability to integrate camera views, understand the workspace, and ensure clearances between the robot arm and obstacles. We believe that these individual differences correlate …
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