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 “"superstrate"”.
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Methods for nano-precise overlay in advanced in pick-and-place assembly
… blocks (PFBs). N-MAP incorporates a vacuum-based superstrate (in place of the template in J-FIL), which is designed to pick up PFBs and to place them at precise locations on a product substrate. In this dissertation we present process flows for N-MAP, designs for the vacuum-based superstrate, as …
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HUU-FA THESIS DAT?: A Syntactic Analysis of Possessive Jamaican Creole Possessive WH-elements
… will be dissected in terms of substrate and superstrate influences as well as the elements involved in their formation. Ultimately, this thesis states that the internal structure of the PP huu-fa prevents it from appearing adnominally. </p>
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Investigation into the design of broadband singly-fed electromagnetically coupled patch (EMCP) antenna elements and arrays for circular polarisation
… layer and a low-dielectric-constant material as superstrate for the radiating patch overcomes the conflict between circuit integration and antenna radiation. The aim of the research presented in this thesis is to design and develop high performance singly-fed microstrip patch antennas and arrays …
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Stealth technologies based on thin microwave FSS absorbers
… also reports the use of resistively loaded FSS superstrate and substrate absorber arrangements as a means to reduce the radar cross-section (RCS) and hence create low-observable (‘stealthy’) metal backed antennas. The design methodology for the superstrate absorber is demonstrated by creating a …
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Surface-enhanced Raman and surface plasmon resonance measurements of Case II diffusion events on the nanometer length scale
… penetrant motion i.e. normal to the plane of the superstrate-polymer interface. This high resolution probe may be used to generate SERS spectra of the polymer/penetrant system during permeation experiments. Penetrant motion and polymer relaxation processes may be simultaneously monitored in situ …
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Numerically efficient analysis of microstrip configurations using closed-form Green's functions
… for a microstrip geometry with a substrate and superstrate for which the thicknesses can be arbitrary. The current distributions are computed for a microstrip line terminated by complex loads, a microstrip line with right-angle bends, and microstrip patch antennas using the closed-form …
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Analysis And Design Of Low Profile Multiband Multifunctional Antenna Arrays
… an x-band (12 ghz) microstrip patch array on a superstrate above printed dual-band (1 and 2 ghz) slot loop antenna arrays in an octave-spaced lattice. The selection of a ground backing reflector is considered for improved gain and system packaging, but restricts the utility of the design …
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Self-assembled Plasmonic Nanostructures for Thin Film Photovoltaics
… fillm in two distinct arrangements, namely superstrate and substrate. In superstrate configration,The coupling e ciency increases with NPs' average size, decreases with increasing distance between silicon, and is signi cantly smaller for spherical than for hemispherical NPs, which stay in …
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Multi-Layered Dual-Band Dual-Polarized Reflectarray Design Toward Rim-Located Reconfigurabable Reflectarrays for Interference Mitigation in Reflector Antennas
… 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 solvers. The results show that the …
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All-optical metamaterial modulators : fabrication, simulation and characterization
… an improved impedance match with the substrate-superstrate (air-glass) combination. In general, the processing procedure to fabricate the fishnet structured negative-index metamaterials is to define the hole-size using a polymetric material, usually by lithographically defining polymer posts, …
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Thin film amorphous silicon cells by inductive PECVD, with a view towards flexible substrates
… complete single junction pin superstrate cells were then fabricated. The deposition conditions were altered to optimise cell efficiency, and the impact of substrate temperature, RF power, gas flow rate, system pressure, and substrate choice was commented on. The best cell …
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Optically tunable external cavity ring laser
… and a surface photonic crystal incorporating a superstrate layer of an azobenzene solution as the wavelength-selective element. Wavelength tuning is realized through optical illumination of a thin layer of azobenzene, which causes a refractive index change of the azobenzene molecules produced by …
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Ultra-thin III-V photovoltaic technology for space applications
… geostationary orbit. In the proposed glass-as-superstrate embodiment, the ultra-thin multi-junction III-V solar cells could eliminate the adhesives and growth substrate supports for significant cost reduction, and maintain high radiation resilience and power conversion efficiency.
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Spectral Signature Modification By Application Of Infrared Frequency-selective Surfaces
… a piezoelectric substrate and a liquid crystal superstrate. These studies will ignite future explorations of IR FSS technology, enabling various unique applications.
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SHRINE A world englishes approach to english language teaching
… Linguistic Influence, Integration in the Superstrate, Narrative and Representation, and Enduring Impact. Together, these dimensions provide teachers with a repeatable analytical sequence that enables them to examine English varieties and integrate them into lesson planning, material …
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Slow-wave electrode structures for III-V semiconductor based electro-optic travelling-wave modulators
… impedances can be designed. A dielectric superstrate may also be used to help slow down the microwave somewhat, potentially enabling fine tuning, as well as to protect the electrodes. The electrodes may also be partially buried in the substrate to achieve some additional slowing of the …
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Wideband Low-Profile Antenna Arrays: Fundamental Limits and Practical Implementations
… may be further improved by adding dielectric superstrate or magnetic substrate material layers.Knowledge of such fundamental bandwidth limits is extremely useful in the design of practical wideband arrays, which is the focus of the second part of this thesis. A key challenge with many wideband …
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Metal oxides as buffer layers in polycrystalline CdTe thin-film solar cells
… to light-facing side of the absorber in a superstrate configuration. The optical and electrical properties of MgxZn1-xO emitters can be modulated by varying the elemental ratio of x = Mg:(Mg + Zn) in the ternary alloy. Tracing the variation of the conversion efficiency as a function of Mg …
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On the Development of Differential Object Marking in Romance
… that non-structural factors, such as extensive superstrate contact with Bantu varieties during the Atlantic Slave Trade, further disfavoured the general acquisition of a-marking, a conclusion further confirmed by the increasing loss of a-marking in the marking of indirect objects in Brazilian …