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四面体

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When the formulas of the tetrahedral element are developed, triangular coordinates is used to develop the boundary integral part of outer boundary element.

其中针对四面体单元的第二、第三类边界条件采用面积坐标积分变换法详细推导了边界积分项的计算过程。

The shape function of FEM based interpolation function is presented according to the FEM theory.

与传统的四面体剖分插值相比较,该方法能够更好地采样数据分布的细节。

Then the computation processes of the wedge sliding safety factor considering seismic influences in 3DEC are carried out, and two important steps in the compute process are given: the determination of the area of triangle, the volume of tetrahedron in 3D and the intersect line vector of two joint faces.

最后,分析考虑地震影响下楔体安全系数计算在3DEC中的实现过程,并且给出计算过程中的2个重要步骤,确定空间三角形的面积和四面体的体积以及确定两节理面的交线矢量。

All faces are mappable or submappable, but the vertex types are specified such that the volume cannot be divided into mappable subvolumes

TGrid/主要采用四面体单元,但是在恰当的地方也用六面体或者,锥体,楔体等单元

Halogen ion can enter and break the phosphate glass network when they exceed certain content. The short range structure of metaphosphate and polyphosphate glasses are all built with phosphate chains. Most of lead ions still act as network modifiers, and some lead ions enter glass network to form tetrahedron or Pb-O-P linear linkages.

Br〓和F〓离子达到一定浓度时就会进入网络,使得玻璃网络发生断裂。P〓O〓含量为50mol%和40mo1%的玻璃样品结构都为链状结构,一部分pb〓离子进入玻璃网络中作为网络形成体,形成四面体或Pb-O-P键:而大部分的pb〓离子仍然作为网络修饰本。

In this state, theorists postulate, the liquid is made up of a continuously fluctuating mix of tetrahedral and more disordered structures, with the ratio of the two depending on temperature – just as Nilsson and his colleagues have found to be the case with water at the ambient temperatures important for life.

在这种状态下,理论家假设,这种液体是由一个不断波动的混合四面体和更加无序的结构构成的。两个比例主要取决于温度,-正如尼尔森和他的同事们发现,水的周围介质温度对生活的重要性。

It was proved that the area coordinates of plane triangle element and the volume coordinates of tetrahedron element are equivalent to the oblique Cartesian coordinates by the analytical and geometrical methods.

本文通过分析法和几何法证明:在有限元法和边界元法中,平面三角形单元的面积坐标或四面体单元的体积坐标与由这些单元的二边或三边构成的斜交笛卡儿二维坐标或三维坐标,尽管定义不同,而其内容却是完全对等的。

It was indicated by UV-Vis spectra characterization that the precursor always contains the tetrahedral Ti species and the octahedral Ti species regardless of the Ti content. Calcination of the precursor resulted in a partial condensation of the octahedral Ti species to form the anatase phase.

UV-Vis 光谱表明,Ti-MWW 合成原粉中含有四面体的钛和八面体的钛,而八面体的钛属于一种骨架外钛,未经酸处理而煅烧会使部分八面体钛缩合形成锐钛矿,而经过酸处理和煅烧后的分子筛则几乎不含有锐钛矿。

This paper shows the importance of ability of iron to occur on both the tetrahedral and octahedral sites of the spinel structure.

表明铁离子出现在尖晶石结构中四面体间隙位和八面体间隙位的能力是极为重要的。

Calculated results show that the position of ions in the interlayers of montmorillonite was related with tetrahedral and octahedral charge sites and ion size.

计算结果表明蒙脱石层间阳离子位置与四面体和八面体电荷位置及离子的大小有关。

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