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 24 for “"reduced mass"”.
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Extending the performance of net shape molded fiber reinforced polymer composite valves for use in internal combustion engines
… (FRC) materials offer the possibility of reduced mass and increased structural performance over conventional metals. When used in reciprocating components of internal combustion engines, this may enable increased power and mechanical efficiency. Previously published work on FRC engine …
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The effects of elevated [CO₂] and decreased vapour pressure deficit on the nutrient status of maize and wheat plants under well-watered conditions
Increases in photosynthetic rates (A), biomass production and grain yield have been measured across a range of C₃ plants under elevated atmospheric [CO₂] ('eCO₂'). However, decreases in the nutritional status of many C₃ plants growing at eCO₂ often occur concurrently with these increases. Several …
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A STUDY ON NOVEL COMPLIANT MECHANISMS FOR ULTRAPRECISION MACHINING
… optimized CM for enhanced dynamics and reduced mass, and a MEMS sensor-embedded anti-tri-chiral (ATC) flexure hinge addressing motion inaccuracies. Leveraging additive manufacturing, topology optimization, mechanical metamaterials, and MEMS technology, the study introduces innovative …
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Development of a microchannel reactor model
… processing system. Microchannel reactors have reduced mass and heat transfer limitations and are able to exploit fast intrinsic kinetics. Also, their high surface area to volume ratio reduces their size for a constant throughput, increasing their potential for miniaturised deployment. Current …
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A precision millimeter-wave measurement of the Rydberg frequency
… transition can be predicted, given that the reduced-mass, relativistic, QED, and proton structure corrections can be computed to the desired accuracy. Recent advances in optical frequency techniques applied to transitions involving low-lying states of hydrogen have decreased the uncertainty …
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A rotary shape memory alloy actuator for CubeSat deployable structures
… prototype meets all requirements and offers a reduced mass, volume, and complexity alternative to current CubeSat electromagnetic actuators. Future work is necessary to improve the mechanical performance and positional control of the SMA actuator.
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Computational study of hot electron generation and energy transport in intense laser produced hot dense matter
… and target heating processes are examined in the reduced mass target experiments. Further, pertinent to fast ignition, laser accelerated fast electron diver- gence and transport in the experiments using warm dense matter (low temperature plasma) is characterized and explained.
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Experimental investigation of microfabricated bipropellant rocket engines
… launch systems and attitude control thrusters of reduced mass will be required. Microrocket engines could provide a low mass, high specific impulse, modular answer to these needs. These small rocket engines would produce thrust of order of 10's of Newtons at a thrust-to-weight of over 1000, over …
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The effects of utilizing silica fume in Portland cement pervious concrete
… dosage rates ranging from zero to ten percent by mass. It was determined that silica fume has negligible effects on the viscosity of cement paste until a dosage rate of five percent, at which point the viscosity increases rapidly. In addition to the rheological testing of the cement paste, trials …
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Numerical Simulation of Vortex Generating Jets in Zero and Adverse Pressure Gradients
… to the production of a primary vortex by the reduced mass flow of the pulsed jet. Finally, an adverse pressure gradient was applied, inducing a laminar separation zone on the plate. A pulsed angled jet induced strong spanwise vortices in the separated shear layer which appear to weaken the …
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The effect of higher order moments in the post-Newtonian gravitational wave expansion on parameter estimation
… position, and orientation parameters and fixed mass ratios between binary objects to generate gravitational waveforms measurements from a detector model which mimics data received from the proposed LISA mission. After that we numerically estimate how well those parameters are determined. The …
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Electroreflectance of gallium arsenide
… at Eo has been -""-----""-~- observed and the reduced effective masses determined to be: light hole reduced effective mass iJ..e"",,::.030,± .005 me' he~vy hole reduced mass iJ.h = .062 ± .015 me' The next higher energy structures,El, El+Al~ were found to be best represented by two-dimensional …
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Ovarian and Growth Hormone Regulation of Mammary Growth and Transcript Abundance in Prepubertal Dairy Heifers
… Mammary growth and development was determined by mass of mammary tissue, biochemical analyses, histological examination, transcript abundance and protein expression in mammary parenchyma (PAR) and fat pad (MFP). Ovariectomy reduced mass and lipid content of PAR without affecting the histological …
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Quartz Crystal Microbalance with Dissipation Monitoring Applications in Polymer Thin Films Analysis
… showed higher tensile stress and modulus, with reduced mass and elongation properties. Particularly, the aging-induced damage of polymer chain integrity was first determined by QCM-D through the evolution of mass loss during aging, providing supports to the changes of mechanical properties under …
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Stabilization dynamics of the ozone molecular system
… isotopic anomaly' in the stratosphere is a mass-independent effect (in contrast to most kinetic isotope effects familiar to chemists) that is traced back to the recombination process in the formation of ozone in the Chapman cycle. Understanding the relative efficiencies (often approximated …
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Structural Optimization of Thin Walled Tubular Structure for Crashworthiness
… new designs with better crashworthiness and reduced mass. Although many gradient based and heuristic methods for topology and topometry based crashworthiness design are available these days, most of them result in stiff structures that are suitable only for a set of vehicle components in …
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Physical biology of biomembranes and biomolecules (PHYBIOM)
… oscillating atoms along bonds is reliant on the reduced Planck constant, reduced mass and bond stiffness. The defined quantum biological equation is used to determine the deformation value changes from its equilibrium bond angle, which is estimated from the molecular geometry, in the …
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Self-adjoint extensions to the Dirac Coulomb Hamiltonian
… the fine structure constant, m is the electron mass, c is the speed of light, and n a positive integer. Note that this formula assumes a stationary positive charge of infinite mass at the center of the atom, and that the energy levels for a more realistic model of an atom with a nucleus of …
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Modeling buoyant droplet plumes in a stratified environment
… hydrates on the droplet surface, whose effect on mass transfer is poorly understood. Fortunately, it is clear that reduced mass transfer rates can be offset by reducing the size of the droplets. Also, while plume characteristics such as plume height are sensitive to parameter uncertainty, the …
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Assessing the Impacts of Agricultural Land Use on Wood Frog (Lithobates sylvaticus) Presence and Health in Central Saskatchewan
… both wood frog presence and health (condition, mass, and neutrophil to lymphocyte (N:L) ratios), I used boosted regression trees, a relatively novel but growing modelling technique in the ecological sciences. Wood frogs were present in both grassland and cropland sites. eDNA was more successful …
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