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 19 of 19 for “"periodic pattern"”.
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Application of electromagnetic-bandgap structures to power distribution network design
… a detailed literature review and an original pattern design example of the application of an electromagnetic bandgap structure which suppresses the simultaneous switching noise in a power distribution network. By accommodating a metalized periodic pattern on either power or ground plane, the …
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Modification and processing of glass and glass with embedded silver nanoparticles
… glass structure, by using an electrode with a periodic pattern the glass was selectively restructured creating an effective DOE. The parameters of the process, namely applied voltage and temperature, were investigated for their part in the efficiency of the resultant DOE.<br/><br/>A second …
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Development of optical field emitter arrays
… and short duration electron bunches that form a periodic pattern in the transverse plane. This thesis theoretically developed optical field emitter arrays that are suitable for use as the electron source for this novel X-ray source. Studies of several optical field emitter array structures, …
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Conformations of semiflexible polymers and filaments
… (ii) a chemically modified stripe and (iii) a periodic pattern of topographical steps. The results are compared with the condensation of rings by attractive interactions. Furthermore, the bundling of two individual actin filaments, whose ends are anchored, is analyzed. This system geometry is …
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Vibro-acoustics of porous materials with periodic inclusions
The design based on periodic elements is a powerful strategy for the achievement of lightweight sound packages and represents a convenient solution for manufacturing aspects. Several theoretical models exist to study the physical behavior of porous and poro-elastic media, and the most complex ones …
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Vortex-induced vibration of slender structures in unsteady flow
… model for slender structures under top-end periodic motions. The key approach to this problem requires identifying the dimensionless parameters important to the unsteady VIV. A set of data from a large-scale model test for highly compliant risers conducted by industry is available. The …
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Novel endoscopes for microscopic assessment of airway clearance using micro-optical coherence tomography
… of the probe allowed visualization of the periodic pattern of ciliary beating, measurement of airway surface liquid depth (ASL) and visualization of mucociliary transport. Unaltered ciliary function was demonstrated in a living, spontaneously breathing swine model. Newer generation …
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Balance Performance Measurment in a Phase Shifted Feedback Environment
… approximately 20 seconds of movement in a periodic (sinusoidal) or non-periodic pattern. Stimulus frequencies ranged between 0.2 and 1.0 Hz with amplitude sufficient to require the subject to move safely within 50% of his/her base of support. Stimulus presentation was randomized and …
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Three-dimensional pulsed disturbances in a plane mixing layer.
… of a pulse train having temporally and spatially periodic pattern is also studied. Wavelet transforms, both 1-D Morlet and 2-D Arc, are applied to study scales of the flow structures. The large-scale structure exhibits a staggered "chain-link"-like pattern in the streamwise and spanwise …
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Organic lasers and nanostructred organic films for hybrid integration
… operational lifetime were characterised. Nano-patterned LEP films for colour conversion of LED light exhibited strong modification of the LEP emission due to the photonic crystal (PhC) effect of the periodic pattern. PhCs allow tailoring of the emission properties by appropriate design of the …
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INVESTIGATING PAIR-RULE GENE ORTHOLOGS IN AN INTERMEDIATE GERM BEETLE, DERMESTES MACULATUS
… are the first cohort of genes expressed in a periodic pattern. Segments are established simultaneously in Drosophila in early embryos, while most other insects add segments sequentially as the embryo elongates. Our goal is to understand molecular mechanisms controlling segment formation and to …
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Nonlinear Mechanical Metamaterial: A Novel Approach Towards Wideband Sound and Vibration Attenuation
… can be mathematically modelled as a periodic chain of mass-in-mass structures. As a first step towards the wideband metamaterial, an aperiodic or graded variation of frequencies of each building block is investigated, instead of a periodic repetition of the mass-in-mass units. …
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Politically Corrected Science: The Early Negotiation of U.S. Agricultural Biotechnology Policy
… in the rDNA controversy occur in repetitive and periodic patterns. During the 1980s, the first rDNA microbial pesticide, Ice-Minus, struggled through a policy gauntlet of federal agency approval processes, a Congressional hearing, and many legal actions before it was finally released into the …
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Investigation of unsteady separated flow and heat transfer using direct and large eddy simulations
… process, onset of instabilities and pseudo-periodic pattern of vortex formation, pairing and shedding. The realism of the simulation is however constrained by the artificially high coherence of the flow imposed by two-dimensionality. The three-dimensional simulations provide a much improved …
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Second-Order Nonlinear Optical Responses in Tapered Optical Fibers with Self-Assembled Organic Multilayers
… taper can be accomplished by introducing a periodic pattern into the nonlinear film coating. We use UV laser ablation for the controlled removal of particular nonlinear film segments on a taper surface in order to produce a Χ(²) grating structure. A resulting SHG enhancement from …
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Investigating the Supracellular Processes Underlying Emergent Material Phase Properties During Embryonic Skin Morphogenesis
… the aspects of self-organization that relate to patterns of chemicals and molecules across a tissue and their relationship to gene regulatory networks, less attention has been given to the physical mechanisms at play. In particular,it is poorly understood how, in complex tissues, cells …
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Combining field experiments, modeling, and analytics for integrated crop-livestock system management
… in the strip grazing treatment. Results of the periodic pattern analysis suggested that cattle had periodic movements associated with their bedding areas likely due to the circadian rhythmicity of their behaviors. Besides mining GPS data for movement patterns, a computational approach was …
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Control of M-G1 phase-specific expression in fission yeast
… of mitotic cell division. Consistent with their periodic pattern of expression, most of the genes transcribed during the M-G1 interval in S. pombe encode proteins that execute important functions during late mitosis and cytokinesis. A DNA sequence promoter motif, the PCB (Pombe cell cycle box), …
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About the role of physico-chemical properties and hydrodynamics on the progress of a precipitation reaction
… oxalic excess. The corresponding precipitates patterns are visualized by optical microscopy and the precipitates are characterized by confocal microscopy SEM, XRD and SAXS measurements. In the intermediate oxalic excess regime, formation of periodic patterns can be observed. These patterns …