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 37 for “"space travel"”.
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The Effects Of Clinorotation In The Host Plant, Medicago Truncatula, And Its Microbial Symbionts
… life support systems for long distance space travel and colonization of other planets. This research utilized the model tripartite relationship among Medicago truncatula–Sinorhizobium meliloti–Rhizophagus irregularis. Plants were inoculated with rhizobial bacteria (S. meliloti), …
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The Effects of Familiarity and Persuasion on Risk Assessment
… of the topics of radiation, low-earth orbit, and space travel result in a lesser concern, and therefore leniency, of the risks involved? How effective is on-the-spot persuasion when discussing risk assessment? How well does increased familiarity of a high-risk activity protect against on-the-spot …
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The Effect of the 2-Dimensional Magnetic Field Profile in Hall Thrusters
… the possibility of long-distance, low-cost space travel. The geometrical details of the Hall thrusters, especially the magnetic field prole, are crucial to improving their efficiency. The effect of the magnetic field structure was investigated using a simple, two-dimensional model, assuming …
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The Concept of Dignity in the Early Science Fiction Novels of Kurt Vonnegut.
… These works use supercomputers, aliens, and space travel, often in a comical manner, to demonstrate that the future, unless people change their concepts of humanity, will not be the paradise of advanced technology and human harmony that some may expect. In fact, Vonnegut suggests that the …
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An Integrated Omics Approach to Define the Molecular Mechanisms of Low Dose, High Charge, High Energy Irradiation (HZE) in Liver
… to HZE ions but will be exposed during deep space travel such as upcoming missions to Mars and the dark side of the moon. Exposure to HZE is a major risk factor for astronauts due to the possibility of HZE induced cancer as well as other potential health risks. In order to access the risks of …
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Towards measuring the relative biological effectiveness of high-energy neutrons at iThemba LABS
In space, neutrons with energies of up to several TeV are produced through the interac-tions of primary cosmic radiation with matter such as in spacecraft shielding, and in the atmospheres and regoliths of moons and planets. The development of radiation health-risk models for space exploration …
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Pursuing A More Habitable Space Module: Using Impression Based Generative Design
… need to fight gravity. A reemerging interest in space by the general public coupled with new economic opportunities has created numerous private companies set on pursuing space travel. With the development of this new sector architects and designers have the unique opportunity to re-examine the …
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Analysis of LEO Radiation Environment and its Effects on Spacecraft's Critical Electronic Devices
<p>Spacecraft, space stations, satellites and astronauts are exposed to an increased level of radiation when in space, and it is important to evaluate the risks associated with extended radiation exposures in missions and space travel in general. The thesis focuses on the LEO radiation environment …
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Spacecraft and Propulsion Technician Error
<p>Commercial aviation and commercial space similarly launch, fly, and land passenger vehicles. Unlike aviation, the U.S. government has not established maintenance policies for commercial space. This study conducted a mixed methods review of 610 U.S. space launches from 1984 through 2011, which …
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Nuclear electric propulsion : assessing the design of Project Prometheus.
… makes it a viable alternative for long-distance space travel. Project Prometheus was a NASA-led project that sought to demonstrate that distant electric propulsion missions were achievable by planning an expedition to characterize the Jovian moons of Jupiter. Several requirements were estimated …
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An integrated big data framework utilizing stream computing to support real-time clinical decision-making in the field of space medicine
Space exploration continues to be one of greatest endeavours of humankind. As manned space exploration extends to deep space, destinations such as the Moon and Mars, technological improvements and scientific advancements are in order, so as to enable safe prolonged human presence in space. Existing …
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Development of a Small University Satellite for Performing a Global Survey of Gravity Waves in the Mesosphere
… including communication, navigation, space travel, weather, and climate change. However, space weather research is currently limited by a lack of essential space measurements. Access to space has not been low cost. The Illinois Observing Nanosatellite (ION) represents an innovative …
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Design, Development, and Testing of Research Payloads on Various Suborbital Flight-Test Platforms
<p>With recent advances in the commercial space industry, suborbital payload launches have become more common and accessible to researchers actively seeking solutions for problems involving prolonged space travel and future missions to Moon and Mars. Suborbital payload missions compared to orbital …
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The hardest to achieve, the easiest to imagine: an examination of predictions about outer space during The Space Race in the Huntsville Times, Houston Chronicle, and Orlando Sentinel
… years humans have made predictions about outer space in fictional and non-fictional works. On October 4, 1957, the Soviet Union proved space exploration was possible with the launch of the first artificial Earth satellite, Sputnik I. This event marked the beginning of The Space Race, a fierce …
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Modeling and simulating human cardiovascular response to acceleration
… This adaptation is entirely appropriate while in space. However, it predisposes astronauts to problems when they return. It has been suggested that the regimen for astronauts on long-duration space travel include periods of artificial acceleration via centrifugation, in order to maintain some …
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Assessment of Iso-Ahola’s Theory of Tourism Motivation on Willingness to Fly as a Point-to-Point Suborbital Space Tourist
<p>Suborbital space tourism involves flight in an air vehicle to an altitude exceeding 100 kilometers (62 miles). This altitude is referred to as the Karman Line and the edge of space. Point-to-point space travel is transportation in an air vehicle where the vehicle flies around the earth in space …
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Stress in a Microgravity Bioreactor
… apparatus. Microgravity environments, such as in space, have been shown to induce alterations in cellular development due to inadequate mechanical loading of biological tissue. Because of this, long-term spaceflight has led to many health concerns, including osteoporosis and muscle atrophy. Space …
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Low magnitude high frequency vibrations applied to the foot through the pedal of a human powered artificial gravity (HPAG) cycle
Astronauts are exposed to hazards unique to space travel. These hazards include radiation exposure and adaptation of the human body to the microgravity environment. For lunar and low earth orbital missions, the exposure period is typically less than six months and return to Earth is less than two …
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Computational Simulation and Machine Learning for Quality Improvement in Composites Assembly
In applications spanning across aerospace, marine, automotive, energy, and space travel domains, composite materials have become ubiquitous because of their superior stiffness-to-weight ratios as well as corrosion and fatigue resistance. However, from a manufacturing perspective, these advanced …
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Increasing Cermet Fuel Thermal Margin with Thoria for Nuclear Thermal Propulsion
… was identified as an alternative for faster space travel over chemical combustion propulsion systems by NASA in its Design Reference Addendum 5.0. Potential improvements to NTP performance were considered by improving the fuel margin to melting point. A thorium-dioxide stabilized, high-assay …
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