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 117 for “"local structure"”.
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UNCOVERING LOCAL STRUCTURE IN DATA
… In addition, we develop a novel measure of local centrality for data and apply the method in the context of networks and elsewhere.
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Local Structure of Operator Algebras
In this thesis some aspects of a local theory for operator algebras are explored. The main purpose is to provide some tools for studying locally compact quantum groups. We first consider inverse limits of $C\sp*$-algebras (pro-$C\sp*$-algebras); among them are the multipliers of the Pedersen ideal …
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Local Structure of Nuclear C*-Algebras
Made available in DSpace on 2015-09-28T15:20:12Z (GMT). No. of bitstreams: 2 license.txt: 4848 bytes, checksum: 96035ab3f5e1c23cc7138a224ce498bd (MD5) 3392004.pdf: 1118456 bytes, checksum: d50eebb72d11c5f55df939f3ce192422 (MD5) Previous issue date: 2009
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Local structure of hybrid metal-halide perovskites
… effects of static and dynamic disorder on the structure and op- toelectronic properties of the hybrid metal halide perovskite family MAPbX3 (MA+ = methylammonium, CH3NH+3 , X = Cl−, Br−). Static disorder was introduced by halide substitution through solid state synthesis, providing better …
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The Local Structure of Sodium-Ion Anodes During Electrochemical Reactions
… function analysis (PDF) and solid-state NMR as local structure probes for our structural characterisation. Furthermore, to avoid relaxation effects in metastable intermediates, much of this work uses \operando methods. We present evidence from \operando $^23$Na NMR that sodium inserts into hard …
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A variational technique for three-dimensional reconstruction of local structure
Thesis (S.M.)--Massachusetts Institute of Technology, Dept. of Electrical Engineering and Computer Science, February 1999.
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Determination of Quadratic Lattices by Local Structure and Sublattices of Codimension One
… lattices are determined up to isometry by their local structure and sublattices of codimension 1. In particular, a theorem of Yoshiyuki Kitaoka for $\mathbb{Z}$-lattices is generalized to definite lattices over algebraic number fields.
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Understanding surface reactivity, local structure, and lithium-metal dendrite initiation in garnet solid electrolytes
… attention, the surface reactivity, regeneration, local structure of dopants in doped LLZO and the dendrite formation have not been systematically characterized and understood. This thesis elucidates the importance of the gas atmosphere and temperature for regeneration by tracking the surface of …
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Accounting for temperature and local structure in atomistic calculations of interface free energies in metals
… properties. However, interfaces have an internal structure with nanoscale features that gives the interface free energy, a location dependent variation. The interface free energy is also expected to depend on temperature, especially for entropy stabilized phases such as liquids. I present methods …
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Local structure analysis of solid state ionic conductors, perovskite-derived structures by NMR and computational studies
In this work, local environments of ions in solid oxide fuel cell (SOFC) electrolyte materials with perovskite and perovskite-derived crystallographic structures, i.e. $Ba_{2}In_{2}O_{5}$, $Ba_{2}(In_{1-x}Ga_{x})_{2}O_{5}$ and $Ba_{2}In_{2}O_{4}(OH)_{2}$, were investigated for their high ionic (O2– …
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Multinuclear NMR Investigations of Local Structure, Distortions and Redox Mechanisms in Layered Lithium Ion Battery Cathode Materials
… Solid state NMR is a powerful tool to study local structure and ^{6/7}Li NMR has been used extensively to probe many aspects of local structure and dynamics in Li-ion batteries. Less commonly studied nuclei, such as ^{59}Co and ^{17}O can also offer complementary information, although their …
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Evolution of local structure and stress development during thermal treatment of sol-gel-derived PZT-based thin layers
… of the need for a fundamental understanding of structure-processing relationships in these systems, this thesis investigates variations in local structure and network development for sol-gel derived precursors in the lead zirconate titanate (PZT) system as a function of heat treatment conditions.
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Molecular Dynamics and X-ray Powder Diffraction Simulations: Investigation of nano-polycrystalline microstructure at the atomic scale coupling local structure configurations and X-ray powder Diffraction techniques
… in metallic nano-polycrystalline microstructures, with the purpose of supporting the analysis of the X-ray powder diffraction patterns with a better, atomic level understanding of the studied system. Complex microstructures were generated with a new modified Voronoi tessellation method …
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Modelling of defect states in covalent amorphous solids
… dynamics simulations, of the bulk and defect structures, in hydrogenated amorphous silicon. Emphasis is given to the systematic analysis of the changes in the network structures, which occur due to the incorporation of hydrogen, at different levels of concentration. The atomic-level stress in …
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A 3-local characterization of the group of the Thompson sporadic simple group
… the Thompson sporadic simple group by its 3-local structure. We study a faithful completion, \(G\), of an amalgam of type F\(_3\) with the property that \(N_G(Z(L_\beta)) = G_\beta\). We first assume no additional 3-local structure and use a \(\kappa\)-proper hypothesis to establish that the …
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Ab initio molecular dynamics simulations of lanthanide coordination structures in water and in faujasite
… as well as in cation exchange in faujasite. The structures of the lanthanide aqua ions were resolved with density functional theory calculations and ab initio molecular dynamics (AIMD) simulations within ~0.05 Å of experimental results. Reaction energies were quantified by predicting the first …
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Structure adaptive stylization of images and video
… novel techniques is that they utilize the smooth structure tensor as a simple and efficient way to obtain information about the local structure of an image. More specifically, this thesis contributes to knowledge in this field in the following ways. First, a comprehensive review of the structure …
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SOLID-STATE NMR INVESTIGATION OF STRUCTURE AND DYNAMICS OF SOLID ELECTROLYTES AND COATINGS FOR LI-ION BATTERY APPLICATIONS
… used to obtain an improved understanding of the local Al and Ga dopant environments. Combined with NMR shift calculations, the unusual 27Al and 71Ga-NMR spectra obtained for doped LLZO were explained and the two high frequency signals assigned to the same tetrahedral site but with different local …
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The impact of abiotic and biogenic mn oxide coatings on contaminant mobility, bioavailability, and attenuation
… on montmorillonite were studied for formation, structure, stability, and surface properties. Coatings dominated the clay surface characteristics where the surface charge behaved similar to that of the discrete oxide and the local structure was consistent with the pure oxide phase. Furthermore, …
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