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Showing 1 to 20 of 50 for “"tetrahedron"”.
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Analysis and Comparison of Three Acoustic Energy Density Probes
… to as follows: the six microphone probe, the tetrahedron probe, and the orthogonal probe. The six microphone probe is so named because it is made up of six microphones, with one pair of microphones oriented along each Cartesian axis. The tetrahedron probe is so named because it has four …
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Sliver -Free Three Dimensional Delaunay Mesh Generation
… It is based on the following observations. Any tetrahedron will disappear from the Delaunay triangulation if a point is added inside the circumsphere of the tetrahedron. Among the tetrahedra created by inserting this new point there could be tetrahedra with large radius-edge ratios, or slivers, …
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Comparação de elementos finitos tridimensionais
… hexahedron isoparametric ZIB-8 and ZIB-20, the tetrahedron TET-4, and there is formed an automatic program where the element ZIB-8 and two compositions of 12 and 24 tetrahedron, are analyzed. The presentation of the work id orientated for preparation of a automatic program to have the ability to …
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Tetrahedra and Their Nets: Mathematical and Pedagogical Implications
… is no simple way of telling if one can build a tetrahedron with the sticks. In fact, even though one can make a triangle with any triple of three lengths selected from the six, one still may not be able to build a tetrahedron. At the other extreme, if one can make a tetrahedron with the six …
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Parallel Delaunay Refinement and Space -Time Meshing
A tetrahedron is acute if all its dihedral angles are less than 90°. Triangulations of three-dimensional domains with acute tetrahedra are useful in mesh generation. We give several constructions for tiling space with acute tetrahedra.
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Flow and mixing studies in a co-rotating intermeshing twin screw extruder
… anti-clockwise and is made up of main and small tetrahedron flow and calender flow. The lower flow regime rotates clockwise and is made up of main and small side leakage flows and a portion of the main tetrahedron flows together with a central flow. The flow studies show conclusively that the …
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Síntesis de precursores farmacéuticos enantioméricamente puros mediante métodos biocatalíticos
… ketone-derived benzo-fused cyclic cyanohydrins¿ Tetrahedron: Asymmetry, 2011, 22, 1218¿1224. En el tercer capítulo, se ha llevado a cabo la síntesis y resolución enzimática de trans-3,4-dihidroxipirrolidinas mediante procesos de acilación enzimática o hidrólisis de sus derivados, los resultados …
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Characterization of calcium-silicate-hydrate and calcium-alumino-silicate-hydrate
… substitution occurred primarily in the bridging tetrahedron position, but also in the pairing tetrahedron position. Aluminum uptake was also examined with respect with Ca/Si ratio and was found to decrease with increasing Ca/Si ratio. The changes in chemical environment of the iii aluminum ion …
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Four-Craft Virtual Coulomb Structure Analysis for 1 to 3 dimensional Geometries
… principal orbit plane. For a three-dimensional tetrahedron formation, the charge products obtained are a unique set of solution. The full three-dimensional rotation of a tetrahedron is reduced to a two angle rotation for simpler analysis. The number of equality constraints for unique spacecraft …
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Der methodische Einsatz von MÖBIUS-Transformationen über den Quaternionen in der Geometrie des Raumes
… well as the circumcenter and circumradius of a tetrahedron in $Imwidehat{h}$. The representations of these points are required for the generalisations of the tetrahedron and parallel version of Roberts' Theorem by continuity arguments. For this also the introduction of the power of a point with …
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Biocatálisis aplicada a la preparación enantioselectiva de heterociclos funcionalizados y compuestos con centros estereogénicos cuaternarios
… en: A. Villar-Barro, R. Brieva, V. Gotor, Tetrahedron: Asymmetry, 2013, 24, 694-698 A. Villar-Barro, R. Brieva, V. Gotor, Bioorganic & Medicinal Chemistry, 2014, 22, 5563-5568. Capítulo 3: Se lleva a cabo una síntesis regioselectiva de derivados 3-amino-4-hidroxipiperidínicos ortogonalmente …
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Intramolecular Ligand Permutation at Tetracoordinate and Pentacoordinate Silicon (Pseudorotation, Hypervalent)
… (2) are described. Silane 1 is a distorted tetrahedron at silicon with a significant deviation towards the trans planar geometry; the 10-Si-5 phenylsiliconate, 2, is nearly trigonal-bipyramidal at silicon. Evidence that the bidentate ligands of 1 preferentially stabilize the …
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Structural, electronic and optical properties of cadmium sulfide nanoparticles
… that confine the orbital wavefunctions strongly (tetrahedron) give rise to less pronounced spectra with lower oscillator strengths. Finally, a very good agreement of the calculated data to experimentally available spectra and excitation energies is found.
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Allosteric Interactions in Coordination Cages
… steroids and enantiopure natural products; and a tetrahedron that binds fullerene clusters. Each of these architectures employs one or more binding site to either: a) template specific products; b) regulate the cooperativity of binding of large anionic guests; c) assemble coordination complexes …
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Use of peptide microarrays for mapping viral b cell epitopes
… Chemical Synthesis on a Membrane Support." Tetrahedron 48(42): 9217-9232.
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Explorations into protein structure with the knob-socket model
… same secondary structure forming the base of the tetrahedron packing with a side-chain from a separate secondary structure. The base of the motif is termed the socket, and the other side-chain is called the knob. Here, we focus on extending the knob-socket model to understand tertiary and …
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Investigating the interaction of a metallosupra molecular cylinder with nucleic acids
… of the iron cylinder on the structure of a DNA tetrahedron nanostructure is examined. Several biophysical techniques confirm that the cylinder binds strongly with the nanostructure, thus leading to the unusual style of a very rigid DNA nanostructure. In Chapter 5, to precisely determine the …
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Acceleration Techniques for Industrial Large Eddy Simulation with High-Order Methods on CPU-GPU Clusters
… of 50 for hexahedron cells and up to 200 for tetrahedron cells. Two low memory implicit time integration methods are implemented on GPUs: the matrix-free GMRES solver and a novel local GMRES-SGS method. Parametric studies are done to evaluate their performance on LES benchmark cases. On the …
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Discrete spring–mass system inversion of lung stiffness from 4DCT with adjoint regularization and graph convolutional network
… network (GCN) as a learned prior. Per tetrahedron Hounsfield units are first mapped to a physiology guided baseline stiffness via a piecewise linear HU to modulus relation. A tetrahedral GCN operating on face adjacency then predicts small log space corrections to this baseline. Its …
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Stimuli-Responsive Metal–Organic Cages
… on guest size. Conversely, the spin-crossover tetrahedron exhibits different affinities for guests in different spin states. Examination of spin-crossover thermodynamics across a series of host–guest complexes enabled sensitive probing of guest fit to the host cavity, providing information …
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