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 32 for “"cell geometry"”.
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Genetic algorithm optimisation of load cell geometry by finite element analysis
… conditions on column strain gauge load cells and to develop the model into a program for optimising the geometry of column load cells. It is shown that, for most practical loading conditions, load celis with large numbers of equispaced strain gauges are only sensitive to the axisymmetric …
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Dynamics of Langmuir circulation in oceanic surface layers
… near the surface both terms depend on the cell geometry. Cells with long wavelengths penetrate more deeply into the water column. These cells grow more slowly than the fastest growing mode for most cases, but always dominate the solution in the absence of Coriolis forces. In the presence of …
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New design methods for sheet pile cellular structures
… methods commonly used to design sheet pile cellular cofferdams and bulkheads were developed in the 1940's and 1950's and are based on semi-empirical approaches. The traditional methods are limited because they do not explicitly incorporate soil-structure interactions, they do not predict …
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Method development for the analysis of electrochemical and transport processes in redox flow batteries at practical operating conditions
… properties (e.g., viscosity, conductivity), cell geometry (e.g., flow field design), and operating parameters (e.g., flow rate, current density) to system performance metrics, such as cycle efficiencies and area-specific resistance.
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Steady state thermal stress analyses of two-dimensional and three-dimensional solid oxide fuel cells
Fuel cells are electrochemical devices which convert fuels directly into electrical energy without combustion. The Solid Oxide Fuel Cell (SOFC) is the most promising energy saving technology to generate electric power. The present work characterizes the thermal stresses arising during the operation …
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Development And Characterization Of Beamforming Antenna Systems
… higher directivity/gain. Different FSS unit cell geometry and sources are combined in the FPC system and corresponding effect on the FPC system performance is parametrically and comparatively studied and discussed (chapter 3). The CPW feedline behavior and energy leakage of the FPC system are …
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Mechanisms of bullseye boundary formation in Hibiscus trionum petal patterning
… striking patterns combining pigmentation, cell shape and cuticular ornamentation. These patterns contribute to plant-pollinator interactions but how spatial control of cell fate specification is achieved across the petal epidermis remains obscure. Hibiscus trionum is an emerging model …
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Experimental and Theoretical Study of Inclusions During Initiation of Crevice Corrosion
… sulfur and thiosulfate. Spectroelectrochemical cell experiments on MnS quantified the electrochemical production of thiosulfate. This finding linked the metallurgical and solution phases and suggested a depassivation mechanism based on a critical crevice solution composition. The range of …
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Investigation of Polymer-Filled Honeycomb Composites with Applications as Variable Stiffness Morphing Aircraft Structures
… this behavior. Moreover, while most engineered cellular structures are comprised of symmetric and periodic cells, cellular structures in nature are commonly spatially varying, asymmetric networks, which have not been considered in these composites. Motivated by these challenges in designing …
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Phase-Matching Optimization of Laser High-Order Harmonics Generated in a Gas Cell
… generation in helium- and neon-filled gas cells of various lengths. Harmonic orders in the range of 50 to 100 are investigated. A semi-infinite cell geometry produces brighter harmonics than cells of sub-centimeter length. In the semi-infinite geometry, the gas occupies the region from the …
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Shear force impacts type IV pilus and flagellar dynamics during Pseudomonas aeruginosa surface adhesion
… Chapter 2, I examine how Pseudomonas aeruginosa cells use type IV pili to interact with surfaces under host-relevant shear forces. I demonstrate that cell tilting, driven by type IV pilus retraction, predicts surface departure at low shear forces. Conversely, higher host-relevant shear forces …
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Performance analysis of functional expansion tallies on 2D PWR pin cell
… analysis of Zernike-based FETs on a 2D PWR pin-cell geometry and compares the simulation time and accuracy with conventional histogram tallies for reaction rate tallies needed in burnup calculations over radial rings. Figures of Merit (FOMs) are constructed for direct comparison of performance …
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Quantum Monte Carlo: Applications of the Twist -Averaged Boundary Conditions and the Calculation of Forces
… is often done with a small system in a super cell geometry. Periodic boundary condition is commonly used in such a setup which leads to large and fluctuating finite size error. Twist-averaged boundary condition (TABC) averages over all the possible twist angles in the boundary condition and …
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Efficient moving mesh methods for Q-tensor models of liquid crystals
… a one-dimensional time-dependent problem in a π-cell geometry with an applied electric field. The numerical results show that, as well as achieving optimal rates of convergence in space and time, higher levels of solution accuracy and a considerable improvement in computational efficiency are …
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Large-scale imaging of endothelial calcium from inside intact atreries
… most studies have been performed in cultured cell models, or in preparations where arteries have been sliced open and flattened out to expose the endothelium to microscopic investigation. Such techniques have provided much useful information, but cannot fully replicate in vivo responses …
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Quantum Monte Carlo: Applications of the Twist-averaged Boundary Conditions and the Calculation of Forces
… is often done with a small system in a super cell geometry. Periodic boundary condition is commonly used in such a setup which leads to large and fluctuating finite size error. Twist-averaged boundary condition(TABC) averages over all the possible twist angles in the boundary condition and …
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Phononic materials as ultrasonic filters in nondestructive evaluation measurements
… This cut-off frequency is controlled by the unit cell geometry of the phononic material. The influence of the additive manufacturing process on the frequency transmission of phononic material is modeled to explain discrepancies between simulation and experiments. An analytical model of second …
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Mechanochemical pattern formation in the cellular actomyosin cortex
Protein patterning is essential for cellular function. From cell division to cell migration, specific positional and temporal arrangement of proteins are requisite to triggering and executing vital cell processes. In the aforementioned examples and many other fundamental cellular activities, …
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Molecular orientation and relaxation behavior in flexible water- blown polyurethane foams
… to depend very little on its anisotropic cell geometry and hence, mainly on the material comprising, the cell-wall struts and windows. Segmental orientation was measured as a function of elongation and relaxation, as well as hysteresis behavior for several of the plaques and the PUUE …
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Multi-Layered Dual-Band Dual-Polarized Reflectarray Design Toward Rim-Located Reconfigurabable Reflectarrays for Interference Mitigation in Reflector Antennas
… substrate, (2) an X-band slot loaded unit cell geometry, (3) a dielectric superstrate, and (4) an L-band layer containing crossed dipoles. The dual band reflectarray is dual linearly polarized to maintain symmetric response. The reflectarray is designed and simulated using full-wave …
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