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 110 for “"isotropy"”.
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Concentrated Force Problems in Transverse Isotropy
Made available in DSpace on 2014-12-13T19:31:50Z (GMT). No. of bitstreams: 1 7913640.pdf: 2270027 bytes, checksum: 6495dd59170c6ef15909528e0899d7a8 (MD5) Previous issue date: 1978
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Isotropy criteria and algorithms for data clustering
… in contrast with their surroundings. We use the isotropy of a point distribution to characterize spatial structure. We argue that identifying the isotropic density neighborhoods of a point, helps in the detection of a diversity of cluster structures that are challenging to many other methods. We …
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A virtual element method for transversely isotropic elasticity
… an axis of symmetry perpendicular to a plane of isotropy, and have applications ranging from fibre reinforcement to biological materials. The governing equations of the transversely isotropic elasticity problem are derived and a virtual element formulation of the problem is presented along with a …
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Anisotropic Cyclic Cosmologies
… use inflation as a mechanism to resolve the isotropy and homogeneity problem of the universe as well as the flatness problem. However, due to various well known problems with the inflationary paradigm, there has been an ongoing search for alternatives. Perhaps the most famous among these are …
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Complexity One Hamiltonian SU(2) and SO(3) Actions
… functions coincide; (2) their isotropy data and genus at 0 are the same; (3) if the zero fibers are tall with principal isotropy group S1, the first Stiefel-Whitney classes of phi-1(0) and phi '-1(0) in H1( Mreg0;Z2 ) and H1 ( M'reg0;Z2 ) are equal (under a proper identification …
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Mathematical modelling of complex dynamics
… have been quantitatively compared for their isotropy. The novel 2D 9–point BV(D2Q9) isotropic stencil operators have been derived from the B.A.C. van Vlimmeren method and their isotropy measure has been determined optimally better than other exiting 2D 9–point discrete Laplacian operators. …
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Semantic modeling of the natural language of Wikipedia annotations
… the model satisfy a geometric symmetry property (isotropy). We show that the isotropy property leads to self-normalization allowing for the design of an efficient parameter estimation algorithm that we christen wiki2vec. The self-normalization property of IBOE is validated empirically on the …
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New Approaches to Synthetic Tabular Data Generation
… burden in STG via LLM priors, (4) embedding isotropy as a trust indicator for STG with LLMs, and (5) STG for next-generation wireless as a telecom application. Through Problems 1 and 2, we aim to improve the quality of generated synthetic tables; in Problem 3, we reduce the computational cost …
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Thermal, Electrical, and Structural Analysis of Graphite Foam
… thermal properties, electrical resistivity, isotropy, and density uniformity of PocoFoam were evaluated. These properties and characteristics of PocoFoam are compared with natural and synthetic graphite in order to show that, albeit similar, it is unique. Thermal diffusivity and thermal …
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Cosmic expansion in homogeneous and inhomogeneous universes : supernovae type Ia as cosmic probes
… or drop the assumption of homogeneity and isotropy. As an example of such a model, we analyze a braneworld model with one timelike extra-dimension. There are strong constraints to the parameter values of such a model resulting from the claim that there must be a physical solution to the …
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Propagation of fluid driven fractures in transversely isotropic material
… media is well established, the impact of the anisotropy of natural rocks on HF propagation is still far from being understood. Sedimentary rocks like shales and mudstones are ubiquitous in upper earth crust which are made of fine layers which result in transverse isotropy. In the framework of …
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Generic planar lattice patterns in liquid crystals
… the Equivariant Branching Lemma and finding isotropy subgroups of ?L with fixed-point subspaces of dimension 1. We then find the time periodic solutions using the Equivariant Hopf Theorem, finding isotropy subgroups of ? x S1 with fixed-point subspaces of dimension 2 by using the group theory …
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Effective Field Theories in Cosmology
… small departures from perfect homogeneity and isotropy observed in our universe, the nature of dark matter and the physical origin of the cosmological constant. Effective field theory methods provide a natural framework to try to address such outstanding questions. For instance, such methods …
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Equivariant coherent sheaves on the nilpotent cone for complex reductive Lie groups
… irreducible representation of the isotropy group of the orbit. A constructive proof of this bijection is given for the groups GL(n, C), and the bijection is established by direct calculation in a handful of particular groups. Partial progress is made on a general proof for Sp(2n, C).
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Ensaios de extrusão de barras entre matrizes de perfil sigmoidal
… and commercial lead in order to determine their isotropy and work-hardening conditions. Strip-extrusion experiments were afterwards made with a sigmoidal die profile for the maximum reduction condition, and with a straight die profile with the sarne reduction and axial lenght. The resul ts were …
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Generation and relaxation of nanometer-scale roughness on the germanium(001) surface
… exhibit a regular pattern of pits. The isotropy of this pattern formation of pits argues against surface curvature dependent sputtering rate and suggests that asymmetric kinetics for the attachment of dimer vacancies at ascending and descending steps drive roughening during etching.
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Design of Lightweight Magnesium Alloys: Processing, Microstructure and Properties
… Nanoindentation con rmed the presence of isotropy in magnesium's modulus with respect to texture and identi ed an unexpected isotropy in hardness with respect to texture.
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Shell finite elements, with applications in biomechanics
… theory extended to take account of transverse isotropy. The finite element formulation is given in such a way as to make various implementational aspects clear. Implementation has been carried out in deal.II, an open source library of finite element code. Substantial detail is given about how …
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1/f noise in semiconductors and metals
… of the instantaneous resistivity fluctuation isotropy, of the Hall noise magnitude and of the correlation between Hall noise and resistivity noise are presented. Results bearing on the Gaussian nature and the spatial coherence of 1/f noise are also given. The discovery of thermally activated …
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1/f noise in semiconductors and metals
… of the instantaneous resistivity fluctuation isotropy, of the Hall noise magnitude and of the correlation between Hall noise and resistivity noise are presented. Results bearing on the Gaussian nature and the spatial coherence of l/f noise are also given. The discovery of thermally activated …
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