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 “"reduced gravity"”.
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THERMOSYPHON FLOODING IN REDUCED GRAVITY ENVIRONMENTS
… on a parabolic flight campaign to achieve the Reduced Gravity Environments (RGE) needed to obtain empirical data for analysis. Current correlation models of Faghri and Tien and Chung do not agree with the data. A new model is presented that predicts the flooding limits for thermosyphons in …
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Teflon pyrolysis in terrestrial and reduced gravity environments
Includes bibliographical references (pages 52-53).
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INHIBITED MINERALIZATION IN OSTEOBLASTS CULTURED UNDER VARIED SIMULATED PARTIAL GRAVITY CONDITIONS AND THE USE OF PHYTONUTRIENTS FOR MITIGATING THE EFFECTS OF REDUCED GRAVITY
The multifaceted adverse effects of reduced gravity on the skeletal system pose a significant challenge to human spaceflight. There is an interest in investigating any hypothetical differences between partial gravity and microgravity, and in the unmet need to identify countermeasures to both. A …
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Automatic design of the gravity-reducing propulsion system of the TALARIS Hopper Testbed
… to the problem of designing Earth-based reduced-gravity simulators, and compares the performance of the found optimal design solutions with that of the MIT TALARIS Hopper Testbed. Earth-based reduced-gravity simulators are platforms that allow hosted vehicles to experience a dynamic …
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Partial Gravity Load Simulation Using Mechanical Off-Loading and Lower Body Negative Pressure
Prolonged exposure to reduced gravity environments can lead to significant deconditioning of the cardiovascular, musculoskeletal, and ocular systems. These effects increase the risk of orthostatic intolerance, bone loss, and conditions such as Spaceflight Associated Neuro-ocular Syndrome (SANS). As …
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Development of the West Virginia University Small Microgravity Research Facility (WVU SMiRF)
… University (WVU) has created the Small Microgravity Research Facility (SMiRF) drop tower through a WVU Research Corporation Program to Stimulate Competitive Research (PSCoR) grant on its campus to increase direct access to inexpensive and repeatable reduced gravity research. In short, a drop …
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Eddy dynamics of ß plumes
… in the deep ocean was investigated using reduced gravity models of the deep ocean forced by a small region of cross isopycnal transport in the interior. The effect of topography on ß-plumes was also examined by placing a Gaussian bump in the forcing region. Despite the fact that the mean …
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Studies of Warm-Core Rings Using a Particle-in-Cell Method
… First, for purposes of model validation, a reduced gravity model is described. The PIC model reproduces the essential characteristics of analytical solutions to the reduced gravity equations and integral invariants are conserved to a high degree. Next, a 1.5-layer model is developed and used …
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Enhanced dynamic load sensor for the International Space Station : design, development, musculoskeletal modeling and experimental evaluation
… a vertebrate musculoskeletal system to the microgravity environment of space leads to a reduction in bone mineral density, muscle mass, strength and endurance. Such deconditioning may impede critical astronaut activities and presents an increased injury risk during flight and when exposed to …
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System characterization and online mass property identification of the SPHERES formation flight testbed
… from test flights aboard NASA's KC-135 micro-gravity aircraft (Reduced Gravity Airplane, RGA).
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Development of a cold gas propulsion system for the TALARIS hopper
The TALARIS (Terrestrial Artificial Lunar And Reduced gravIty Simulator) hopper is a small prototype flying vehicle developed as an Earth-based testbed for guidance, navigation, and control algorithms that will be used for robotic exploration of lunar and other planetary surfaces. It has two …
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Generation and maintenance of recirculations by Gulf Stream instabilities
… strongly barotropic flows. In the case of the reduced-gravity model, recirculations develop only for infinite deformation raduis. Basic flows with finite deformation radius are only weakly supercritical and therefore produced negligible recirculations after equilibration. The problem of …
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Design and utility assessment of attitude control systems for EVA task performance
Low gravity astronaut extravehicular activity (EVA) missions using a maneuvering Jetpack and robotic servicing and assembly missions could benet from spacecraft systems capable of maintaining pointing stability during critical operations. The addition of single-gimbal control moment gyroscopes …
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Generation and maintenance of recirculations by Gulf Stream instabilities
… strongly barotropic flows. In the case of the reduced-gravity model, recirculations develop only for infinite deformation raduis. Basic flows with finite deformation radius are only weakly supercritical and therefore produced negligible recirculations after equilibration. The problem of …
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Predicting eddy detachment from thin jets
Using a semi-geostrophic, reduced gravity thin jet model, we analytically study the evolution of initial meanders into pinched-off rings. The model used is similar to the path equation developed by Flierl and Robinson {1984) for vertically coherent meanders. However, in the present model, the …
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Comparison of heat sink and fan combinations and thermal electric coolers for use in the Mars Gravity Biosatellite
… methods for the payload module of the Mars Gravity Biosatellite. The Satellite will be launched into space with 15 mice on board and rotated to create a 0.38g centrifugal acceleration, the acceleration due to gravity on Mars. The mission will last 5 weeks and take valuable data on mammal's …
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The bioenergetics of walking and running in space suits
… that the human run-walk transition in Earth gravity occurs when energy recovery for walking and running are approximately equal. The dependence of muscle efficiency on gravity -during locomotion and under a particular set of assumptions- was derived as part of the framework. Next, I collected …
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A technical, financial, and policy analysis of the RAMSES RFID inventory management system for NASA's International Space Station: prospects for SBIR/STTR technology infusion
… NPV. Testing of the prototype hardware in reduced-gravity conditions reaffirmed the viability of the system. Metals cargo objects were detected with up to 100% accuracy, paper with 96%, and water with roughly 93%. Finally, a comparative analysis of RAMSES and five other NASA Small-Business …
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Seasonality of the Agulhas Current with respect to near- and far-field winds
… based on observations. A one-and-a-half layer reduced gravity model is shown to successfully reproduce the seasonal phasing of the current. This seasonality is found to be highly sensitive to the propagation speed of Rossby waves, which determines the arrival time of the wind stress signal at …
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