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 38 for “"surface and interface"”.
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Strain at surface and interface steps
… (TEM) is a powerful tool for the study of interface and surface phenomena. Its sensitivity to lattice plane orientation allows for the imaging of crystal strain. In this thesis, I will present a unique method for quantitatively measuring crystal strain using TEM. This method relies on the …
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Surface and interface studies of compound semiconductors
The geometric and electronic properties of compound semiconductor surfaces and interfaces were studied using experimental techniques such as electron and x-ray diffraction, Auger spectroscopy, synchrotron photoemission, and scanning tunneling microscopy. Some of the surface and interfacial …
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Surface and Interface Magnetism in Nanostructures and Thin Films
… materials are useful for device applications and intriguing for the new fundamental physics they may display. Magnetism at the nanoscale is dominated by size and surface effects which combined with other media lead to new spin dynamics and interfacial coupling phenomena. These new properties …
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Surface and interface effects in valence band photoemission of noble metals
… photoemission probes sample initial and final states involved in direct transitions within the valence bands of the noble metals. Experiments studying these direct transitions have yielded fundamental understanding of the electronic structure of noble metals and of the valence band …
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Surface and interface engineering in quantum dot and double-heterojunction nanorod light-emitting diodes
… electroluminescent layer have shown efficiencies and brightness that rival the best organic LEDs. One of the biggest challenges on developing these high performance QD-LEDs is the charge balance in these devices. Since the valence band edges of CdSe and the typical shell materials (CdS or ZnS) are …
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Surface and interface characterisation of high-k dielectric materials on silicon and III-V semiconductor substrates
Interface formation between high-k dielectric oxide materials and semiconductor surfaces is of critical importance to the development of the next generation of high speed semiconductor devices. This thesis investigates the deposition and characterisation of a range of candidate high-k materials on …
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Analysis of wave propagation in pipeline and plate-like structures for surface and interface condition assessment.
… in wave propagation characteristics in single and multilayer pipeline and plate-like structures, with the goal of supporting surface and interface condition assessment. Interface degradation in multilayer structures is a critical issue across various industries (e.g., oil and gas, subsea, …
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Long waves in water over a visco-elastic muddy seabed
The propagation of surface waves over a flat muddy seabed are studied. Mud is first considered as a Newtonian fluid. Water and mud equations are derived in order to obtain governing equation for surface and interface waves. By the method of multiple scales. nonlinear evolution equations are derived …
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Microscopic Study of Structure, Chemical Composition and Local Conductivity of La2/3Sr1/3MnO3 Films
… due to their richness of underlying physics and potential technological applications. Of particular interest is half-metallic La2/3Sr1/3MnO3 (LSMO) because it possesses the highest known Curie temperature of the group ~ 370 K), which makes it a promising candidate for room temperature …
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INTERFACE ENGINEERING OF 2D MATERIAL NANODEVICES
Attributing to the large surface-to-volume ration of 2D materials, their electrical performance is highly sensitive to extrinsic factors arising from surface and interface in the device configuration. In this thesis, by adopting crested substrates, high-performance transition metal dichalcogenides …
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Applications of computer algebra to the theory of electron energy loss
… thesis develops dielectric theory in multilayers and following cases have been considered: <br></br><br></br> - Normal incidence on a multilayered slab with n isotropic layers. <br></br><br></br> - Parallel incidence on a multilayered slab with n isotropic layers. <br></br><br></br> - Normal and …
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Surfaces and interfaces characterization for the development of diamond power electronic devices
… challenges of humanity with increasing energy demands. High power elements in the electric grid such as rectifiers are currently based on silicon. Design of new architectures has kept silicon-based devices on top of the high-power devices market. However, the inherent limitations of silicon have …
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Photo-Hall studies of compound semiconductors
… in a wide variety of electronic, optoelectronic and microwave device applications. Temperature dependent photo-Hall effect measurements have been made on the high purity compound semiconductors GaAs, InP and a ternary alloy In$\sb{0.53}$Ga$\sb{0.47}$As. The major emphasis of this work involves …
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From Protein Folds to Chromatin: Topological Data Analysis and Deep Learning at Multiple Scales
… organization governs molecular function and regulation. We present two complementary computational frameworks that integrate geometric, topological, and spatial modeling with deep learning to elucidate these structure–function relationships. CASTpFold extends the Computed Atlas of Surface …
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Thermodynamic properties of intermetallics
… a solid-state reaction of corundum (α - Al2O3) and iron. Further, the Al2O3 surface energies of various planes were investigated. In addition, interfaces, which are of experimental interest within CRC 920, were modelled: α - Al2O3 (0001) || Al(111), TiO2 (rutile) || MgTiO3 (geikielite) and α - …
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Flow Imaging of the Fluid Mechanics of Multilayer Slide Coating. Flow visualisation of layers formation in a 3-layers slide coating die, measurement of their thicknesses and interfacial and free surface flow instabilities
… depending on operating conditions (thickness and velocity of individual layers and the physical properties of the coating fluids), flow instabilities may arise at the interfaces between the layers and on the top layer. These instabilities ruin the application of the final multi-layered coating …
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Time-of-Flight Secondary Ion Mass Spectrometry Analysis of Microbial Induced Corrosion of Glasses
… radioactive waste glass, environmental cleanup and disposal of radioactive material, and weathering effects of microbes. Improved understanding of relevant bacterial systems and biological secretions help in the development of nuclear waste vitrification materials. A Paenibacillus sp. …
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Application of cellulosic materials as flexible substrates for two-dimensional electronic heterostructure devices
… of nanomaterials comprises a suite of strong and flexible conducting, semiconducting, and dielectric materials. These materials, all compatible with one another can be combined to enable an incredibly wide variety of behaviors and device structures. Designs for structures using 2D materials …
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Grazing angle neutron diffraction
We describe the conceptual development and practical implementation of grazing-angle neutron diffraction as a new method of non-destructive surface and interface analysis. Diffraction in the grazing-angle geometry with x rays and neutrons possesses two unique advantages over specifically …
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