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 36 for “"Structural disorder"”.
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Diffraction of point sets with structural disorder
Die vorliegende Arbeit behandelt Diffraktionseigenschaften gewisser zufälliger Strukturen. Hierbei sind die Strukturen beschrieben durch (gewichtete) Zählmaße. Untersucht werden dann die zugehörigen Diffraktionsmaße, die durch die Fourier-Transformierten der jeweiligen Autokorrelationsmaße gegeben …
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Electrical properties and structural disorder in stannate pyrochlores
Thesis (Ph. D.)--Massachusetts Institute of Technology, Dept. of Materials Science and Engineering, 1996.
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Transmission Electron Microscopy Of Structural Disorder In Two-Dimensional Materials
… offers an unprecedented opportunity to study disordered systems down to the single-atom level. The reduced dimensionality of these systems provides a two-fold opportunity: first, 2D materials serve as model systems for exploring direct correlations between the structure and properties of …
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Optimization and Analysis of Weighted-Window Predictors of Structural Disorder in Proteins
The file named "holladaynathan.pdf" is the primary dissertation file. A supplemental Microsoft Excel file ("hollady_suppl_workbook.xls") is also available.
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New experimental and theoretical tools for studying protein systems with elements of structural disorder
<p>Disordered proteins are one class of proteins which do not possess well-folded three-dimensional structures as their native conformations. Many eukaryotic proteins have been found to be fully disordered or contain certain disordered regions. Disordered proteins usually display several …
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Influence of Structural Disorder on Charge Transport and Stability in Organic Field-Effect Transistors with Molecular Semiconductors
… transport regime where the prevalent static disorder and complex structural dynamics couple with charge carrier motion, fundamentally affecting the delocalization of electronic wavefunctions and the (opto-)electronic properties of devices on a macroscopic scale. Our systematic study, …
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Electrical conductivity and structural disorder in Gd₂Ti₂O₇-Gd₂Zr₂O₇ and Y₂Ti₂O₇-Y₂Zr₂O₇ solid solutions
Thesis. (Ph. D.)--Massachusetts Institute of Technology, Dept. of Materials Science and Engineering, 1988.
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Thermische Tieftemperatureigenschaften von Seltenerd-Übergangsmetall-Borkarbiden
… conductivity and thermopower. The influence of structural disorder, caused by stoichiometric variations and substitutions of the rare earth element or the transition metal, on the thermal and superconducting low-temperature properties is investigated. The structural disorder results in the …
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A study of the mean-square displacement amplitudes of T and O atoms in framework silicates and aluminosilicates: evidence for rigid TO bonds, order, disorder, twinning and stacking faults in crystals
… Criteria are established which indicate order, structural disorder or substitutional disorder in a framework crystal.
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Optical studies of ion-bombarded gallium arsenide
The present work studies the disorder in ion-implanted and ion-etched GaAs semiconductors. The primary targets in this study consist of two types of systems:45-keV Be⁺-implanted GaAs and low-energy Ar⁺-etched GaAs. Electronic and lattice structural disorder in these systems are investigated by …
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Nuclear magnetic resonance investigations of structural phase transitions in silicon dioxide cristobalite and tridymite and related phases
… magnetic resonance (NMR) techniques in studying structural phase transitions (SPT's) of the SiO$\sb2$ cristobalite and SiO$\sb2$ and AlPO$\sb4$ tridymite polymorphs. The structural properties and SPT's of these phases have been of mineralogical, physical and industrial interest for decades. …
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Understanding and Optimising Carbon Disorder for High-Performance Supercapacitors
… materials in commercial EDLCs. However, their structural complexity has made it challenging to determine the key structural factors that determine capacitive performance, leading to a lack of clear design principles for making nanoporous carbons with enhanced performance. This work investigates …
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"“Phonon"" and electron transport in glass-crystal dual materials"
Disorder has been a long-standing driver across all sectors of materials engineering, ranging from energy and transportation, to electronics and communications, and to biomedicine and environment. Disorder engineering has focused primarily on tuning its spatial configuration and distribution to …
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Optical Properties of Rare-Earth Doped YBO3 Phosphor Materials
… been used to correlate the high chromaticity to structural disorder in YBO3:Eu3+ structure. Further, hydro(solvo)thermally synthesized YBO3: Eu3+ tri-doped Ce3+,Tb3+ samples have shown a promise way to obtain the high R/O ratio along with efficient near UV excitation states. Raman vibrational …
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Defect Engineering in Cuprous Oxide (Cu₂O) Solar Cells
… electron-blocking layer that has origin in local structural disorder and establish the structure-process- property relationship of a-ZTO so that the front buffer layer can be optimized for photovoltaics. Then, I investigate the doping mechanism of Sn dopant atoms in TFs and single crystalline …
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An Exploration of Bonding in V_1−x Mo_x O_2 (x ≤ 0.53) and Other Compounds
… effects of strong metal--metal bonding on the structural disorder in V\(_{1-x}\)Mo\(_{x}\)O\(_2\), using a detailed analysis of total x-ray scattering data. This investigation established that strong metal--metal bonding enhances short-range correlations in the rutile phase while suppressing …
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Harnessing Vibrations for Efficient Exciton Dynamics in Semiconducting Energy Materials
… of exciton transport, despite low energetic and structural disorder. By directly measuring the excited-state vibrations, we are able to construct non-adiabatic simulations which reveal that zero-point motion enables access to delocalized states which mediate transport. This new transient …
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Microscopic characterization of macroscopic colloidal gel rheology
… state of thermodynamic nonequilibrium and the structural disorder of the network due to kinetic arrest of the attractive particles call for comprehensive investigation of colloidal gel rheology. In this thesis, we develop a better physical understanding of key rheological characteristics of a …
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Covalent modification and intrinsic disorder in the stability of the proneural protein Neurogenin 2
… mediated by post-translational modifications and structural disorder. Firstly I will describe work focused on ubiquitylation of xNgn2, targeting it for proteasomal degradation. xNgn2 is ubiquitylated on lysines, the recognized site of modification. I will discuss the role of lysines in …
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Computational Amide I Spectroscopy from the ground up : building and benchmarking new tools to study disordered peptide ensembles
In the "form follows function" paradigm of structural biology, we seek to understand-and control-protein function based on our knowledge of protein structure. This process is often difficult for intrinsically disordered proteins and peptides (IDPs) which possess inherent structural disorder in …
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