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 132 for “"microgravity"”.
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Stress in a Microgravity Bioreactor
… a Random Positioning Machine (RPM) 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 …
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Lipid Signaling Under Microgravity Conditions
… of the Space environment, which include microgravity, altered nutrition, increased radiation exposure, confinement, and other stressors. In this context, a substantial body of literature has documented that the functional integrity of multiple tissues is compromised during Space missions. …
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Modelling of microgravity ignition phenomena
The structure and stability of flame balls and the characteristics of the outwardly propagating spherical flames of sub-limit mixtures are studied both analytically and numerically in the context of an asymptotic analysis in which $\theta\to\infty$, and (1 $-$ Le) = O(1/$\theta$), where $\theta$ is …
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Microgravity measurement in space using imaging techniques.
… and an experiment to image convection in microgravity, with a view to analysing its use for the detection of changes in gravity has been performed.
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A Study on Vibration-induced Particle Motion under Microgravity
… properties is considered to be possible under microgravity conditions due to the absence of natural convection effects. Such materials have several beneficial properties that can improve the human life. An example is the synthesis of protein crystals with improved structure that can be …
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Thermovibrationally-driven flows and particle accumulation in microgravity environments
… phenomena are studied in the context of a microgravity environment. The problem is addressed numerically through solution of the governing equations for fluid flow and particle transport (Eulerian-Lagrangian one-way coupled approach). This work follows a logical approach with cases of …
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The impact of microgravity conditions on human gut microbiome
… unique environmental challenges, particularly microgravity, which can significantly alter the composition and functionality of the gut microbiome, with potential consequences for astronaut health. Despite increasing interest in space microbiology, the precise effects of microgravity on …
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Wearable Sensor System for Quantifying Proprioceptive Competence in Microgravity
Microgravity poses a significant challenge for our neurovestibular and proprioceptive systems. Past spaceflight and parabolic research have shown degraded movement control upon microgravity exposure and adaptation of performance with time. However, most research does not address the functional, …
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Active microgravity vibration isolation using PVDF polymer piezoelectric actuators
Thesis (M.S.)--Massachusetts Institute of Technology, Dept. of Aeronautics and Astronautics, 1991.
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Microgravity Exerts an Age-Dependent Effect on Cardiovascular Progenitor Cell Development
<p>The heart and its cellular components are profoundly altered by missions to space and injury on Earth. Increasing evidence has identified that one such alteration induced by spaceflight is the promotion of the efficacious use of stem cells in therapies on Earth. For this reason, neonatal and …
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Development of a CubeSat Instrument for Microgravity Particle Damper Performance Analysis
… a potential solution, driving the need for microgravity characterization. A 1U cubesat satellite presents a low cost, low risk platform for the acquisition of data needed for this evaluation, but severely restricts available mass, volume, power and bandwidth resources. This paper details the …
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The role of osteocytes in disuse and microgravity-induces bone loss
… to investigate their role in disuse and microgravity-induced bone loss. Specifically, we generated and characterized a novel osteocytic cell line that recapitulates the response to hormonal and mechanical stimuli of osteocytes in vivo. This novel cell line provided the first evidence of a …
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Measurement of the surface tension of electromagnetically-levitated droplets in microgravity
Thesis (Ph. D.)--Massachusetts Institute of Technology, Dept. of Materials Science and Engineering, 1995.
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A critical benefit analysis of artificial gravity as a microgravity countermeasure
Human physiological systems, especially the cardiovascular and musculo-skeletal systems, are well-known to decondition during spaceflight. Several countermeasures that are in use today have been rigorously developed over the decades to combat this deconditioning. However, these countermeasures are …
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Numerical Modelling of Sooting Laminar Diffusion Flames at Elevated Pressures and Microgravity
… space. Flames display significant changes under microgravity and high-pressure conditions as compared to normal-gravity flames at atmospheric pressure, but the exact causes of these changes are not well-characterized. As such, the effects of gravity and pressure on the stability characteristics …
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Development of the West Virginia University Small Microgravity Research Facility (WVU SMiRF)
… Virginia 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 …
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An experimental protocol for the evaluation of graphic input devices in microgravity
Thesis (M.S.)--Massachusetts Institute of Technology, Dept. of Aeronautics and Astronautics, 1986.
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Numerical Study of Nutrient Mixing in Trabecular Bone in Microgravity, Disuse and Normogravity
… transport within the trabecular network. In microgravity, the absence of mechanical stimulation or loading suppresses convective flow processes, causing diffusion-driven nutrient mixing and renewal, and accelerated bone loss. This thesis investigates how oscillation frequency and trabecular …
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Neural Mechanisms of Motor Imagery and Training-Induced Plasticity: Hypnotizability Relevance to Microgravity Adaptation
Long exposure to extreme environments, such 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 …
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