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 270 for “"Tetrahedral"”.
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Tetrahedral Mesh Improvement, Algorithms and Experiments
The persistent appearance of slivers in large three-dimensional Delaunay meshes has been reported as early as 1985. They persist even after treatment with the Delaunay refinement algorithm. Cheng et al. proposed to remove slivers by assigning real weights to the points and change the Delaunay to …
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Chemical controls on tetrahedral site occupancy in amphiboles
Thesis (M.S.)--Michigan State University. Dept. of Geology, 1971
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Interactive Visualization of Large Higher-Order Tetrahedral Data
… Our methods are not limited to higher-order tetrahedral data, they can be generalized to other non-linear or linear volumetric data sets as sell.
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Hyper-Rayleigh scattering measurements of hyperpolarizabilities for tetrahedral molecules
First hyperpolarizabilities beta of carbon tetrachloride, carbon tetrafluoride, deuterated methane, and methane have been measured by hyper-Rayleigh scattering in gas and liquid phases. The gas-phase results for the coefficient beta xyz (atomic units) are 11.0 +/- 0.9 (CC14), 5.4 +/- 0.4 (CF4), 7.0 …
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Three dimensional fracture mechanics computations using tetrahedral finite elements
… create complicated 3-D models and mesh them with tetrahedral elements with relative ease, the application of finite element techniques in mechanical design has reached unprecedented proportions. However, the extension of these techniques to fracture mechanics studies is hindered by the …
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Cucurbiturils, tetrahedral capsules, and porous systems: synthesis, functionalization, and applications
… beginning of the second year of the doctorate a tetrahedral capsule was exploited as a nanoreactor for the realization of dehydration reactions in water for synthesis of nitrones. During the second year a new supramolecular system was developed capable of adsorbing a significant amount of carbon …
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Local-rules based topological modeling of tetrahedral ceramic network structures
Thesis (Ph. D.)--Massachusetts Institute of Technology, Dept. of Mathematics, 1998.
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The structure of coesite and the classification of tetrahedral structures
Thesis (Ph. D.)--Massachusetts Institute of Technology, Dept. of Geology, 1959.
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Understanding reaction pathways leading to tetrahedral organic cages via alkyne metathesis
… the discovery of novel kinetically trapped tetrahedral cages synthesized via alkyne metathesis (chapter 2), an investigation of the origin of the kinetic trap (chapter 3), and the development of strategies to probe the dependence of reaction pathways on structural variables of the precursor …
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Solving the Cartesian cut-cell interpolation problem with a tetrahedral mesh
Thesis (S.M.)--Massachusetts Institute of Technology, Dept. of Aeronautics and Astronautics, 2001.
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Anisotropic output-based adaptation with tetrahedral cut cells for compressible flows
… First, a finite-volume discretization for tetrahedral cut-cells is developed that makes possible robust, anisotropic adaptation on complex bodies. Through grid refinement studies on inviscid flows, this cut-cell discretization is shown to produce similar accuracy as boundary-conforming …
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Transformation of digital building models from boundary representation to tetrahedral space partitioning
… from a Boundary Representation (B-rep) to a tetrahedral space partitioning. This transformation addresses the limitations of current digital building models, especially their lack of explicit spatial relationship information among building components. Converting to a tetrahedral space …
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Fully anisotropic split-tree adaptive refinement mesh generation using tetrahedral mesh stitching
… the geometry and the Cartesian mesh before it is tetrahedralized. FASTAR uses tree traversal to determine neighbors robustly, and with the tetrahedralization of only a small amount of space around the geometry, sliver cells and inverted elements are avoided. The code uses Riemannian Metric Tensors …
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Method to design and fabricate an octahedral-tetrahedral spaceframe from repurposed scaffolding
… configurations that a multi-layered octahedral- tetrahedral (octet) spaceframe can accommodate. The octet geometry is considered because of its inherent versatility, rigidity and economy. This lattice has received renewed interest in the study of nano and microscale cellular structures due to …
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Hydronium ion and water interactions with SiOSi, SiOAl, and AlOAl tetrahedral linkages
The minimum energy structures of H₆Si₂O₇, H₇SiAlO₇, and H₈Al₂O₇ have been calculated using quantum mechanical molecular orbital techniques. The calculated bond lengths and angles of H₆Si₂O₇ and H₇SiAlO₇ agree with those found in silicate and aluminosilicate minerals, but no such comparison is …
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Tetrahedral mesh optimization and generation via topological transformations and gradient based node perturbation
A general tetrahedral mesh optimization scheme utilizing both topological changes (i.e. flips) and gradient-based vertex optimization (i.e. smoothing) is demonstrated. This scheme is used in the optimization of tetrahedral meshes created by third-party software as well as a grid generation …
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Three-dimensional upward scheme for solving the Euler equations on unstructured tetrahedral grids
… Euler equations on unstructured tetrahedral meshes. The method yields solution accuracy and efficiency comparable to that currently available from similar structured-grid codes. The key to achieving this result is a novel cell reconstruction process which is based on an analytical …
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Electrical and electrochemical properties of nitrogen-containing tetrahedral amorphous carbon (ta-C) thin films
… Properties of Nitrogen-Containing Tetrahedral Amorphous Carbon(ta-C) Thin-Films ByXingyi YangTetrahedral amorphous carbon (ta-C) is a diamond-like carbon (DLC) material comprised of a mixture of sp2 (~40%) and sp3-bonded (~60%) carbon domains. The physicochemical structure and …
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Searching for Mixed Octahedral-Tetrahedral Interstitial Hydrogen Occupation in Pd-Ti Sublattices: A Computational Study
… the Pd-Ti-H system for stable instances of mixed tetrahedral-octahedral site occupation. We compute the energies of 42 hydrides constructed from seven metal sublattices: Ni₃Ti-prototype Pd₃Ti, CdI₂-prototype PdTi₂, and FCC four-atom unit cells of Pd, Pd₃Ti, PdTi, PdTi₃, and Ti. Our results suggest …
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The Magneto Circular Dichroism of Octahedral Chromium(iii) in Ruby and of Tetrahedral Cobalt(ii) Halides
Made available in DSpace on 2014-12-09T17:36:26Z (GMT). No. of bitstreams: 1 7000989.pdf: 4318738 bytes, checksum: 9f9280fcca1ac59b6558f256076f598f (MD5) Previous issue date: 1969
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