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 51 for “"amorphous materials"”.
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Transient photoconduction in amorphous materials
… current pulses that would be expected for amorphous materials possessing known density of states distributions. Two simulation methods are used, the Monte Carlo technique and the finite difference method. While the Monte Carlo method makes few basic assumptions, the transients produced are …
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Microscopic Theory of Linear Response in Amorphous Materials
… and mechanical properties of disordered materials, as well as non-centrosymmetric crystals. The Caldeira-Leggett Hamiltonian opens a route to the (both Markovian and nonMarkovian) fluctuation-dissipation theorem (FDT) and gives rise to the generalised Langevin equation (GLE) in classical …
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Relationships Between Structure, Dynamics, And Flow In Sheared Amorphous Materials
Amorphous solids, those composed of haphazardly arranged constituents, are found everywhere from our windows as silicate glass, in the ground and foundations as mud and concrete, and our grocery stores as granular piles of oranges. Even though they can be found over a huge range of length scales, …
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Quantifying Nanoscale Order in Amorphous Materials via Fluctuation Electron Microscopy
… and quantitative description of the structure of amorphous materials. Using variable resolution FEM we are able to extract a characteristic length of ordered regions in two different amorphous silicon samples. Having eliminated the noise contribution to the variance, we show here the first …
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Statistics of slip avalanches in sheared amorphous materials based on atomistic simulation
Many experiments have found that amorphous materials deform via slip avalanches in the plastic regime, which are bursts of plastic flows and show scale free features, as evidenced by a power-law probability distribution of the magnitude of serrations in stress-strain curves. Mesoscale models of …
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Quantitative analysis of nanoscale order in amorphous materials by stem-mode fluctuation electron microscopy
… order on the 1 – 3 nm length scale in amorphous materials. Extracting quantitative information about the nanoscale order from FEM data has been an on-going challenge due to issues both in experimental procedures, as well as in development of data analysis and modeling methods. The use …
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The effects of irradiation on the creep and hardening behavior of crystalline and amorphous materials
… the mechanical behavior of nanostructured and amorphous materials under harsh environments such as high irradiation dose and temperature is one of the major constraints in the development of novel materials for nuclear applications. This thesis explores the effects of irradiation on the …
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Data-Driven Research for Amorphous Materials: Towards Seamless Utilization of Publication Data in Chemical Sciences
… long standing challenges in the research on amorphous materials have been identified. In particular, the lack of reliable data repositories for properties and structures of amorphous materials significantly limits the possibilities for research. As a consequence, state-of-the-art data-driven …
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Structure of and Phase Transformations in Bulk Amorphous (GaSb)i_x(Ge2)I
Amorphous materials are not new to scientists and mankind — man has been using glass and glassy materials for centuries. However the scientific study of amorphous materials did not start until the beginning of this century. The technique of solid Slate amorphization is even newer. The method brings …
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Low Temperature Properties of the Orientationally Disordered Material: Cyanide-Doped Potassium Bromide
… which appears to be similar to that found in amorphous materials and many crystals containing disorder is observed. At a CN concentration of 50%, the behavior is similar to that of an amorphous epoxy. Comparison is made with amorphous materials and with a theory developed by Anderson, …
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Low Temperature Properties of the Orientationally Disordered Material: Cyanide-Doped Potassium Bromide
… which appears to be similar to that found in amorphous materials and many crystals containing disorder is observed. At a CN concentration of 50%, the behavior is similar to that of an amorphous epoxy. Comparison is made with amorphous materials and with a theory developed by Anderson, …
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Multiscale Modeling and Applications in Nanotribology
… multiscale modeling approach to scaling up amorphous materials using Pseudo Amorphous Cell (PAC) is proposed. This approach is derived in detail for 2D case. It is then validated by performing multiscale simulation of nanoindentation on a 2D polymer substrate. A good agreement between the …
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Generation of ultrahigh frequency acoustic waves for the characterization of complex materials
… anomalous low-temperature thermal properties of amorphous materials is first given as a theoretical framework in which the rest of the thesis is treated. The theory models the form and function of microscopic dynamical and structural features that are thought to be common to amorphous materials, …
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Self-Consistent Phonon Theory of Aperiodic Solids and Density Functional Theories of Freezing and Vitrification
… fluctuations of the hard sphere crystal to an amorphous lattice. In doing so, we develop a theory of lattice vibrations in amorphous materials via a perturbation theory around the Einstein oscillator approximation. This development is analogous to the mean spherical model description of …
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Computational framework for metastable materials discovery: integrating kinetics and accurate properties
… and experimental realization of many new materials with exceptional properties and technological promise. One of the remaining challenges in computational materials discovery is the prediction of metastable materials: long-lived materials with an atomic structure that is not the global …
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Influence of Structural Relaxation Upon the Low Temperature Properties of Metallic Glasses
… is similar to that of the large class of amorphous materials previously investigated, including other metallic glasses. We have analyzed the influence of the electron-phonon interaction upon the phonon thermal conductivity (kappa)(,ph) (T < 1K) in PdSiCu. Our quantitative results agree …
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Phase transition induced deformation in porous media
… in equilibrium thermodynamics. Porous, amorphous materials are widely used in everyday life, yet their complex spatial structures lead to unresolved questions for statistical mechanics, both in- and out-of equilibrium. In this thesis I examine the mechanical consequences of capillary …
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Low-temperature thermal expansion of amorphous solids
"For most amorphous materials at temperatures below ~ 1 K, the magnitudes and temperature dependences of specific heat, thermal conductivity and ultrasonic dispersion are qualitatively similar, independent of chemical composition. It has been suggested that thermal expansion also exhibits this …
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Electron spin-lattice relaxation in two heme iron and two blue-copper proteins at liquid helium temperatures
… similar to the localization crossover in amorphous materials.
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Development of Multivariate Powder X-ray Diffraction Techniques and Total Scattering Analyses to Enable Informatic Calibration of Solid Dispersion Potential
… phase-separated co-solidified products from amorphous molecular solid dispersions. The central hypothesis states that a combination of materials properties exists that defines the propensity of an active pharmaceutical ingredient to form a binary amorphous molecular solid dispersion with …
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