四面体

H3正三角形和H4正四面体结构的变分计算

A Variational Calculation of Equilateral Triangle H-3 and Tetrahedron H-4

目的利用计算机的VISUALBASIC60编程技术，编制了利用四面体法优化高效液相流动相组成的程序。

Objective Using the Visual Basic 6.0 program technique to compile the procedure of the tetrahedron method for the optimization of the mobile phase by the high performance liquid chromatography .

大部分GAS（4／2）四面体共边连接。

Most of GaS4 / 2 tetrahedra are edge-shared .

文章建立了立方四面体3d2络合物g因子的完全高阶微扰公式。

A complete high-order perturbation formula of g factor for cubic 3d ~ 2 MX_4 clusters was established .

H5~-的正四面体中心和正方形中心构型能量的理论计算

The energy calculations for the body - centred regular tetrahedral and the centred square structures of H - 5

在四面体构型中，中心B原子与吡啶环上的N原子形成了配位键，且配位键的键长在B原子与临近配体所形成的键长中最长。

In the typical tetrahedral geometry , the coordination bond length formed from between B and N on the pyridyl is the most longest .

采用阵面推进法（Advancingfront）生成了高质量的三维四面体非结构网格。

The advancing front method is explored to generated three dimensional ( 3D ) unstructured tetrahedral grids with high quality .

用flip变换法恢复四面体网格中的约束边

Using flip transformation to recover the constrained edges in tetrahedral mesh

三维边界一致约束DT四面体有限元网格生成

3D Topology Conformity of Constrained DT Tetrahedralization Finite Element Mesh Generation

约束数据域Delaunay四面体网格生成算法

Algorithm of mesh generation of Delaunay tetrahedral in constrained domain

结果表明2为氧桥联双核结构Cr（Ⅱ）配合物，Cr中心处于正四面体扭曲的平面四配位构型。

The X-ray result indicates that 2 is dinuclear oxygen-bridged Cr ( II ) complex in a tetrahedrally distorted square-planar coordination geometry .

介绍一种基于四面体网格的多重网格技术，用于求解三维Euler方程定常解，具有十分明显的加速收敛效果。

This paper describes a three-dimensional adaptive multigrid method on unstructured meshes for the Euler equations .

结果表明，Ga占据骨架四面体位置，影响四面体层电荷及Al柱的交联密度。

The results indicate that the charge of tetrahedral sheet and pillaring density are related to the amounts of Gallium in tetrahedral sheet .

在墨铜矿的结构中，Fe离子可占据硫化物层中四面体和氢氧化物层的八面体两种配位位置。

In the structure of valleriite , iron ions may occupy two sites : tetrahedral site in sulfide layer and octahedral site in hydroxide layer .

CdS高的含量可归因于含Ga硫系玻璃中金属-金属键和共边连接四面体的分离。

The high solubility of CdS is ascribed to the dissociation of metal-metal bonds and edge-shared tetrahedra in these Ga-containing glasses .

基于Delaunay四面体剖分的网格分割算法

Mesh Segmentation Based on 3D Delaunay Triangulation

提高了催化剂体系碱性及SiO4四面体周围电子云密度。

Meanwhile , the basicity of the catalyst systems and the electron cloud density were both enhanced .

采用Delaunay三角剖分技术生成三维流场的四面体网格。

The Delaunay triangulation is used both to generate the meshes and to refine the meshes .

关于正四面体生成的Sierpinski块的Hausdorff维数

Hausdorff Dimension of Sierpinski Block Generated by Normal Tetrahedron

GTP模型中四面体的引入及其空间模型扩展

Apply Tetrahedrons to GTP Model and Resulted Spatial Model Improvement

本文的创新点在于，以商业模式理论为基础，以H公司为分析对象，构建了H公司四面体商业模式模型。

The innovation of this article is existing in constructing a " tetrahedron " business model of H Corporation by taking itself as analysis object , making business model as basis .

碱性长石中Fe~（3+）在四面体位置间交换动力学的EPR研究

EPR study on exchange kinetics of fe ~ ( 3 + ) over the tetrahedral positions in alkali feldspar

该化合物的一维链是由四个多面体环构筑的，即两个{MoO4}四面体，两个{FeN2O3}六面体。

The structure of the compound exhibits one-dimensional chain constructed from four-polyhedral rings consisting of two { MoO4 } tetrahedra and two { FeN2O3 } hexahedra .

研究了（Si，Al）O4四面体、骨架结构及沸石水红外吸收带在热处理后的变化，讨论了其特点以及与沸石结构变化的关系。

The changes of infrared absorption peaks assigned to [ Si ( Al ) O_4 ] , tetrahedra , framework and zeolite water are discussed with the structural changes during thermal treatment .

经典Delaunay四面体化方法是对给定节点集凸包的四面体网格剖分算法，当待剖分域为非凸时不能保证其边界一致性（亦即某些边界丢失）。

Classical Delaunay Tetrahedralization method usually produces a triangulation mesh that forms the convex hull of the point on the boundary .

利用球面和多面角的几何性质，采取逐步覆盖的方法，讨论了球内接正四面体、正n棱柱算法，在这个基础上，提出菠萝形算法和球冠逐步覆盖法。

In this paper , the regular tetrahedron algorithm and the n-side regular prism algorithm were discussed , according to the geometric properties of spheres and polyhedral angles and by using the method of stepwise covering .

建立地质构造三维可视化模型的典型方法包括三维规则网格法、TIN表面法、四面体法以及综合法。

The typical 3D visually modeling methods of geological structure include the 3D regular network model , the TIN surface model , the tetrahedron elements model and the integration model .

DNA序列与正四面体（RT）中的映象点（D格点）具有对应关系。

There is a corresponding relation between a mapping point ( D lattice point ) in the RT ( regular tetrahedron ) and a DNA sequence ( Zhang , 1991 ) .

X型沸石晶体的表面结构花纹是β笼四面体在各个面族上叠合的轨迹，与β笼四面体的联结方向相互对应。

The surface structure patterns of zeolite X crystal are the superposition tracks of β cage tetrahedra on every crystal face family , and corresponded with the coupling direction of β cage tetrahedron mutually .

用Al（13）交联皂石时，交联密度与四面体片上AlO4的量相关；

The pillar density is relative to the AlO_4 amount in tetrahedral sheet if the saponite is pillared with Al_ ( 13 ) .