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 799 for “"Physics, Condensed Matter"”.
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A Study Of Structure-Property Correlation In V2o5 And Tio2 Based Thin Films As Functional Materials
… Dr. K. R. Padmanabhan</p> <p>Major: Physics (Condensed Matter)</p> <p>Degree: Doctor of Philosophy</p> <p>The focus of this thesis is to study the structure-property correlation in thin films of V2O5 and TiO2 based transition metal oxides as functional materials. V2O5 is investigated …
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A Systematic Framework for Feature Analysis, Selection, and Property Prediction of Chemical Materials Using Machine Learning
… research domains, including solid-state physics, condensed matter physics, materials science and engineering, as well as spectroscopic characterisation. The overarching objective is to establish a holistic, universally applicable materials discovery workflow that minimises computational …
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MAGNETIC PROPERTIES OF NICKEL - RHODIUM ALLOYS NEAR THE CRITICAL-COMPOSITION FOR FERROMAGNETISM.
MAGNETIC PROPERTIES OF NICKEL - RHODIUM ALLOYS NEAR THE CRITICAL-COMPOSITION FOR FERROMAGNETISM.
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Optical excitation of bulk semiconductors by phase-locked pulses.
Optical excitation of bulk semiconductors by phase-locked pulses.
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An investigation of mercury zinc telluride-cadmium telluride strained-layer superlattices grown by molecular beam epitaxy.
An investigation of mercury zinc telluride-cadmium telluride strained-layer superlattices grown by molecular beam epitaxy.
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Scanning Tunneling Microscopy and Spectroscopy Measurements of Superconductor/Ferromagnet Hybrids
The focus of this thesis work is the study of the nanoscale electronic properties of magnetically coupled superconductor/ferromagnet hybrid structures using low-temperature scanning tunneling microscopy and spectroscopy (LT-STM/STS) under ultra-high vacuum conditions. There are a number of novel …
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New evidence for flux cutting in type II superconductors.
We present new evidence for cross flow and cutting of nonparallel flux lines in type II superconductors. A dramatic reversal is observed in the evolution of $B\sb{z}\sb{hole}$, the axial flux density in the cavity of a hollow cylinder when the magnitude of a helical magnetic field, $\vec H\sb{ext} …
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A iron-57 Moessbauer study on the thermal oxidation of iron in biotite mica.
We have studied the oxidation in air of a well characterized biotite sample. Large single crystal wafers were annealed at various temperatures up to 875$\sp\circ$C and for various times up to 94 hours. The oxidation proceeds primarily via the oxyannite reaction: $\rm (Fe\sp{2+} + OH\sp-)\sb{mica} …
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Various Manifestation of Non -Abelian Statistics in Condensed Matter Systems
Since fractional statistics of Laughlin states is reflected in its topological degeneracy, it is natural to expect non-Abelian statistics to have some effect on topological degeneracy. To study the topological degeneracy of the Moore-Read nu = 5/2 quantum Hall state on a torus, we construct the …
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Morphological Changes in Compressible Foams
We introduce a model free energy, assuming the bubbles in the foam to come in just two sizes and calculate its global minimum for different values of the parameters. We then consider the transition in more detail and show how some subtle factors of the foam's structure and the parameters of the …
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Spectral Energy Dynamics and Wavevector Resonance in a Weakly Nonlinear Chaotic Elastodynamic Billiard
Nonlinear coupling of elastodynamic waves within an elastic body leads to spectral energy redistribution. The coupling strength can exhibit a sharp increase as a function of frequency due to wavevector coincidences between constituent waves of different wave types. The phenomenon is investigated …
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Chemically Enhanced Physical Vapor Deposition (Cepvd) of Tantalum Nitride-Based Films for Diffusion Barrier Layers Used in ULSI Devices
A zero-order semi-empirical model is established allowing the attachment of physical understanding and CEPVD experimental phenomena. The model stems from the knowledge of reactive sputtering and PECVD processes as well as the acquired CEPVD experiment results. It correlates the processing …
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Applications of High-Intensity Ultrasound for Synthesis and Modification of Advanced Materials
"Applications of superconductors are determined by the critical current density, above which a superconductor becomes resistive and dissipates energy. To increase the critical value, small defects are introduced into the superconductor's bulk (""pinning""). Ultrasonic irradiation of alkane slurries …
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Forward-Backward Methods for Mixed System Dynamics
When a quantum system is inhomogeneous (comprised of two particle types, each one having different size and time scales) it is possible to achieve an optimal mix of accuracy and computational efficiency in the study of its dynamics by applying mixed methods---methods that treat the two subsystems …
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Theory and Applications of Fluctuating-Charge Models
Fluctuating-charge models are computationally efficient methods of treating polarization and charge-transfer phenomena in molecular mechanics and classical molecular dynamics simulations. They are also theoretically appealing as they are minimally parameterized, with parameters corresponding to the …
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Real-Time Path Integral Simulations of Variable Frequency Phonons and Spin Reservoirs in Condensed Materials
… technology is used to describe the influence of condensed media on several quantum systems. A comparison of vibrational adiabatic methods and exact path integral formulations is made in the context of variable frequency oscillators. Particular attention is paid to the motion of impurities in a …
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Studies of Interfacial Phenomena: Alkanethiol Adsorption and Patterning on Gold and the Superconducting Proximity Effect in Superconductor /Semiconductor Systems
The second phenomenon studied is the superconducting proximity effect at Nb/InAs and NbN/InAs interfaces. Previous investigations of Nb/InGaAs show an excess conductance at low bias voltages when the system is superconducting. However, current models do not sufficiently explain this excess …
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Theoretical Study of the Electronic Structure and Reactions Involving Oxygen-Bridged Cu-Pairs in Zeolite Catalysts for Lean Nitric Oxide Abatement
Metal-ion-exchanged zeolite catalysts (e.g., Cu-ZSM-5) are promising candidates for lean NOx automotive exhaust treatment. Despite extensive analysis, the relative importance of isolated metal ions and pairs of metal ions in catalytic chemistry is still unclear. In this investigation, two …
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A Continuum Thermomechanical Model for Energetic Materials
The model is then simplified to a set of three model problems: the constant-volume thermal explosion, one-dimensional shear loading, and one dimensional longitudinal loading. These model problems were solved numerically using essentially non-oscillatory and total variation diminishing methods. The …
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Order Reduction, Identification and Localization Studies of Dynamical Systems
In the third and final part of the thesis, a new technique based on Green!s function method is proposed to identify the dynamics of practical bolted joints. By modeling the difference between the dynamics of the bolted structure and the corresponding unbolted one, one constructs a nonparametric …
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