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 14 of 14 for “"Periodic surface"”.
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Two-dimensional periodic surface lattice high power millimetre wave experiment
… electron maser based on a two-dimensional (2D) periodic surface lattice has been demonstrated. Second harmonic Gyrotron Backward Wave Oscillator (BWO) interaction with a two dimensional periodic surface lattice (PSL) has been observed. The major achievements in the thesis are the 1) design, 2) …
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The interaction of periodic surface gravity waves with slowly varying water currents
The governing equations for interactions between surface gravity wavetrains and slowly-varying water currents are derived and the incorporation of Vocoidal water wave theory into this framework is discussed. The emphasis throughout is on the derivation of the general form of the governing equations …
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Investigation of high and low spatial frequency laser induced periodic surface structures on metals
Submission original under an indefinite embargo labeled 'Open Access'. The submission was exported from vireo on 2025-03-28 without embargo terms
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Formation of in-plane crystals of molecular organic semiconductors
… presents (1) an investigation of substrate surface modification as a means of inducing order within polycrystalline organic thin films, and (2) a new method for oriented, in-plane growth of millimeter-scale single crystal needles of molecular organic semiconductors. Two types of modified …
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Plonasluoksnių galio nitrido dangų modifikavimas lazerine femtosekundine UV spinduliuote /
… parameters on ablation and on the formation of periodic surface structures. The topographies of the ablated regions were measured with a profilometer (repeatability $\sigma_{n-1} = 12$ nm). The ablated structures were characterized using three variables: ablation depth, ablation efficiency, and …
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Anode Materials for High Power Microwave Devices
… this, two methods have been identified: laser surface melting for outgassing reduction and laser surface structuring for secondary electron emission reduction. Localised laser surface melting allows controlled grain nucleation, grain size increase and shaping, to create a hydrogen atom …
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Polymer Gels: Kinetics, Dynamics Studies and Their Applications as Biomaterials
… inside a hydrogel. Polymer gels with engineered surface patterns were implemented. NIPA gel deposited on the surface of an acrylamide gel can be used as responsive gel display. A dynamically measurement technique of local shear modulus and swelling ratio of gel is presented based on an engineered …
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Investigating The Relationship Between Surface Topology And Functional Characteristics For Injection Moulded Thermoplastic Components
Bacteria are known to adhere to surfaces, which allows for the formation of biofilms, possibly causing a surge in hospital-offset infections, perilous diseases, and in some cases, death. Although certain bacteria are present in the natural flora of the human skin, some present extreme clinical …
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Spontaneous symmetry breaking transport : from anomalous response to chiral separation
… of Brownian particles exposed to symmetric periodic potentials and driven out of equilibrium by symmetric driving forces at several examples. For any non-zero temperature, the average velocity vanishes but there may be dynamical states of sustained transport spontaneously breaking the …
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Spatial modeling for periodic surfaces in manufacturing
… is essential for characterizing and monitoring surface quality in manufacturing. However, the measurement of high-resolution spatial data is generally expensive and time-consuming. Interpolation based on spatial models is a typical approach to cost-effectively acquire high-resolution data. …
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Nanophosphor-based Photonics
… combination with a photonic system based on periodic arrays of metallic nanopar-ticles. Second, for the first time, soft lithography is applied directly to phosphor nanoparticles to obtain monolithic structures with periodic surface patterns. Finally, inks are formulated to create arbitrary …
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Interference and resonance of internal gravity waves
… wave field generated by harmonic, spatially-periodic surface forcing of a strongly-stratified, thin upper layer sitting atop a weakly-stratified, deep lower layer. In linear regimes, the energy flux associated with relatively high frequency internal waves is prevented from entering the lower …
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High speed mask-less laser-controlled precision micro-additive manufacture
… tungsten was first deposited followed by quasi-periodic structures perpendicular to the linear polarization of the laser beam. The wavelength of the periodic structures was approximately half the laser wavelength (λ/2) and was thought to be formed due to interference between the incident laser …
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Design of bio-inspired texturing treatments, via high power ultra-short pulse lasers, of ferritic stainless steel surfaces that inhibit the formation of bacterial biofouling on tools for hospital use and in the food industry
… is their high capacity to adhere to different surfaces. This adhesion process results in the formation of biofilms. The significance of these biostructures lies in the fact that the bacteria within them acquire new properties, such as increased resistance to antibiotics and unfavorable external …