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.
Results
Showing 1 to 20 of 71 for “"driving mechanism"”.
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On a driving mechanism for galactic spirals.
Thesis: Ph. D., Massachusetts Institute of Technology, Department of Mathematics, 1973
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Intraplate stress and the driving mechanism for plate tectonics.
Thesis. 1978. Ph.D.--Massachusetts Institute of Technology. Dept. of Earth and Planetary Science.
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The VT1 Shape Memory Alloy Heat Engine Design
… because they were dependent on friction as the driving mechanism, which led to large energy losses and slip. This thesis proposes a new chain and sprocket driving mechanism that is independent of friction and should therefore allow for large-scale power generation. This thesis begins by …
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Design and optimization of a three-fingered robot hand
… anatomy and behaviour helps improve a robotic mechanisms ability to perform human tasks. The following thesis introduces the concept of a threefingered robot hand and its driving mechanism. The hand includes two fingers and a thumb. Using the concept of “an under actuated system”, each finger …
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Nuclear Spin Dependence in Reactions of Hydrogen (3+) Ion in the Laboratory and the Interstellar Medium
… strong evidence that this reaction is the driving mechanism for the steady state enrichment of para- H+3 in diffuse clouds, and predictions from the models imply that it is also responsible for the enrichment of para- H+3 and para-H2 in dense clouds. The results of this work have …
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Optically Controlled High Power High Speed Wide Band Gap Devices
… to fast and jitter free switching optical driving mechanism provides complete galvanic isolation as well as enhances the reliability and EMI immunity of the whole system. </p> <p> This research work discusses the effort in developing this technology through design, processing and …
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Analysis of truck overturn accidents on Virginia interstate systems: a case study of I-81
… any hitch between the loading section and front driving mechanism, tractor trailers (TR -TR) having two bodies coupled by a hitch, and twin tractor trailers (TW-TR) with front driving mechanisms towed by a double trailer. Vehicle miles of travel (VMT) for these trucks have been steadily …
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The effects of light level and temperature on freshwater microbial biomass, production, enzyme activity, and community composition
… were positively correlated, suggesting a similar driving mechanism. These findings advance our limited understanding of the synergistic effects of light and temperature on microbial communities.</p>
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Study of microwave-assisted magnetization dynamics in magnetic films and structures
… map the spin wave contribution to the reversal mechanism. The study showed that spin waves are the dominant driving mechanism of reversal in small elements. Finally, a novel electrical characterization technique for MAMR using the spin-pumping phenomenon is demonstrated.
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Inter-finger coordination in robot hands via mechanical implementation of principal components analysis
… decreased actuator count. In this paper, a novel mechanism is proposed to drive a dexterous, versatile, 17 degree-of-freedom robot hand using only two DC motors. Posture data was collected with a dataglove, and analyzed using principal components analysis to determine the postural synergies. The …
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Glycosaminoglycan biosynthesis controls C. elegans vulval morphogenesis and is required for the first cell division during embryogenesis
… and cell-matrix interactions. To investigate a driving mechanism of morphogenesis in organ formation, we characterized a group of C. elegans mutants defective in vulval morphogenesis. We established that the morphogenetic defect is caused by disruption in biosynthesis of chondroitin …
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The Physics of Rodent Ultrasonic Vocalizations
… cetaceans and rodents. Of these two the mechanism behind the rodent calls are better understood. Thus, this thesis investigates the physics of rodent USVs with the hope that findings will help elucidate the mechanisms behind cetacean USVs. Chapter 1 discusses the anatomical background of …
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Micromechanical Aspects of Aging in Granular Soils
… at the particle scale to determine its main driving mechanism and define the factors which affect it. Results from an extensive laboratory testing program and computer simulations based on the discrete element method provide insight into the causes of aging and its effects on the macroscopic …
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Investigating the role of trichodesmium spp. in the oceanic nitrogen cycle through observations and models
… in cyclones/anticyclones as a driving mechanism and investigated the process using idealized three-dimensional models. Elevated abundances in anticyclones in spring 2011 were correlated with anomalously fresh water connected to river outflow. A bio-optical model based on …
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En route towards advanced catalyst materials for the electrocatalytic water splitting reaction
… been systematically pursued: to understand the driving mechanism of the growth. Moreover, deeper understanding of inherent properties and kinetic parameters of the catalytic materials has been gained.
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Oblique reflections of internal gravity wave beams
… in a manner specified by the frequency of the driving mechanism. Since there is no spatial variation along the direction of the flow field, plane waves are exact nonlinear solutions of the governing equations. In general, energy is carried in the form of a wave beam, which is a superposition of …
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Thermoacoustic Analysis and Experimental Validation of Statistically-Based Flame Transfer Function Extracted from Computational Fluid Dynamics
… the flame and the acoustic field. One potential driving mechanism for these instabilities arise when velocity fluctuations (u') at the fuel injection location causes perturbations in the local equivalence ratio and is convected to the flame location generating an unsteady heat release (q') at a …
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The Biomechanics of Tracheal Compression in the Darkling Beetle, Zophobas morio
… to test the hypothesis that pressure is a driving mechanism for RTC. We found that tracheae collapse as pressure increases, but other physiological factors in the body may be affecting tracheal compression in live beetles. Additionally, as the tracheae compress, they do so in varying …
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Changes in Antarctic Bottom Water Formation During Interglacial Periods
… westerly winds is hypothesized to be the driving mechanism behind this reduction.</p>
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Experimental study of lube oil characteristics in the PCV system and effects on engine oil consumption
… decade have been trying to study the sources and driving mechanism of oil consumption. In contrast to oil consumption mechanisms in the piston-ring-liner system of the engine, the Positive Crankcase Ventilation (PCV) blowby-oil consumption mechanism has not yet been fully characterized. Studies …
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