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  • noun

Words related to tetrahedron

any polyhedron having four plane faces

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Here, we reported a series of new material [Sr.sub.2-x][Na.sub.x]Nb[O.sub.4] containing Nb[O.sub.4] tetrahedra, which was prepared from sodium niobate and SrC[O.sub.3] with different ratios under ambient air.
Given its significantly more sparse point-set, a residue-based (i.e., one point per residue) tessellation typically yields a few hundred tetrahedra, whereas tessellation applied to all the atoms in the same protein structure has on the order of a few thousand tetrahedra.
(1) A spun normal surface S in M is an embedded surface formed from elementary disks in the tetrahedra consisting of finitely many quadrilaterals and infinitely many triangular disks.
For each type of residue quadruplet (i, j, k, and l), let [f.sub.ijkl] denote the observed proportion of tetrahedra generated by all 1417 protein structure tessellations for which these four residues appear at the vertices, and let [p.sub.ijkl] represent a rate expected by chance for the same quadruplet, computed using the multinomial probability distribution
The minimal s-t cut of the graph labels each tetrahedra as "being full" with a full label or "being free" with a free label.
By looking at the B-O coordination, two types of polyhedral structure elements can be distinguished in the structure: triangles and tetrahedra. All B1 belong to triangles (coordinated by O1, O2, and O3), and all B2 are tetrahedrally coordinated with oxygen atoms.
The more substance a region contains, such as gas, stars, dark matter or dark energy, the more tetrahedra Arepo devotes to that region, which enables it to simulate the behaviour and flow of these substances more accurately.
Within this framework we can treat typical element shapes like triangles or quadrilaterals in two dimensions, tetrahedra, hexahedra, prisms or pyramids in three dimensions, as well as other, less standard shapes.
Papers from the symposium are presented here, covering specific topics such as greedy beta-skeletons in three dimensions, high-order Voronoi sculpture, and the role of quasi-regular tetrahedra in dense ordered packings of hard spheres.
"You can get a lot of mileage out of building things with tetrahedra," he says.
This paper address the existence of Hamiltonian paths and cycles in two-dimensional grids consisting of triangles or quadrilaterals, and three-dimensional grids consisting of tetrahedra or hexahedra.
Grids generated in FLUENT can consist of quadrilaterals and triangles for 2-D simulations and hexahedrals, prisms, pyramids, and tetrahedra for 3-D simulations.
The mesh engines create quality meshes on the first pass because they build solid 'brick" (8 or 20 node) or hybrid meshes (combines bricks on model surface with tetrahedra inside) inward from a quadrilateral surface mesh.
We will then come to the realization that all structuring can be identified in terms of tetrahedra and of topology' (Fuller, 1975, 362.00).