四面体

The morphology of calcium carbonate scale withthe presence of the PAA is not in order any more, but can be still observed the shapeof cubic structure. The crystal morphology of calcium carbonate scale with addingP is completely destroyed, and XRD spectrums show the quantity ofcalcite reduces, so the scales become loose, spongy, floccular and amorphous.

添加PAA后尽管表面不再平整但仍能观察到比较规整的四面体晶体结构；而添加P后晶体形状被彻底破坏，垢样成为疏松、多孔、絮状的无定形聚集体。X衍射谱图也表明，添加P后垢样中方解石含量减少甚多，垢样变得疏松。

The short range order is the similar as structure of diopside ferrian and hedenbergite existed in the glass ceramics and hasthe precursor structures of crystal phase.

微晶玻璃中存在[SiO4]和[Fe3+O4]四面体单元，析出相具有和透辉石和钙铁辉石类似的结构。

There are SiO4 and Fe3+O4 tetrahedral units in glass ce- ramics. The short range order is the similar as structure of diopside ferrian and hedenbergite existed in the glass ceramics.

微晶玻璃中存在[SiO4]和[Fe3+O4]四面体单元，析出相具有和透辉石和钙铁辉石类似的结构。

If we used potentiostatic electrosynthesis method, a kind of black polymer film was found on cathodic surface when 〓 was more negative than-1. 40V . XPS analysis demonstrated that the film formed from excited pyruvic acid, tetrahedral intermediate and imino acid.

时，电极表面上吸附的丙酮酸，四面体中间体和亚胺酸受激而生成黑色的聚合膜，通过XPS技术对聚合物进行了定性、定量和结构分析。

By amending the auxiliary geometric primitive,diagonal,of generalized tri-prism into tetrahedron ,the inconsistentness of data organization and of geometric primitive in real 3D geosciences modeling as well as the geometric interstice in spatial operation were solved.

将广义三棱柱的辅助几何要素———对角线———修正为四面体，解决了R3DGM中数据组织与几何要素的不一致和空间操作中的几何裂缝问题。

The meshwork results are obtained from the later pictures. They clearly show the structure of four-dimension reseau and some meshwork results of shell data. The reason why the whole results are not achieved is that there are too many circumstances in which five or more dots share the same orb. In this case, the principle Delaunay is not in point any more, then the process of establishing meshwork will be intermitted.

后面的四幅图是后来所作的工作，得到了一个正方体四顶点以及其中心点的建网结果，从这里能清楚地看到四面体网格的结构，还有对贝壳数据点云的部分建网结果，之所以没有完成整个贝壳数据的建网是因为数据中存在较多的五点或五点以上共球的情况，这种情况下Delaunay准则不再适用，建网会中断，所以只完成了一个部分。

Chromatographic fingerprint index F and chromatographic fingerprint relative index Fr were used as the objective functions for the evaluation,and the extract of Saussurea involucrate by water was used as the sample.

以色谱指纹图谱指数F和色谱指纹图谱相对指数Fr作为评价毛细管电泳分析系统的目标函数，以雪莲药材水提取液为样品，考察一定浓度的硼砂、硼酸、磷酸氢二钠和磷酸二氢钠溶液按三角形优化法和四面体优化法构成背景电解质时对样品的分离情况，通过添加有机改性剂和调节pH进行再优化。

Methods A wet hip joint's sample from corpse was scaned by CT and all images of every cross-section hip joint's layer was obtained, and an hip joint's model was contructed with Unigraphics NX 2.0 and Solid Works 2006 SP 0.0 software. The models were assembled when simulated total hip arthroplasty after total hip joint prosthetic and ischiofemoral ligament model had been constructured. Analysis was done on von Mises stress distribution and amount of total hip component when simulated seated leg-crossing manuver. The bone and metal components were meshed as rigid bodies, composed of three-dimensional, all-quadrilateral rigid body elements, and hip joint capsule ligament was fully three-dimensional, hexahedral continuum elements representations. Results The current form of this ischiofemoral ligament's reconstruction finite element model provided for multi-body contact, large displacement interfacial sliding, large deformation capsule ligament representation, and clearly reflected the real ischiofemoral ligansent's anatomy and biomechanical behavior. The maximum on Mises stresses at the joint interface was more than that fur an otherwise identical hardware-only construct.

选择成人尸体髋关节行CT成像得到髋关节每层横截面图像，提取边界坐标，利用有限元分析软件Unigraphics NX 2.0和Solid-Works 2006 SP0.0构建出髋关节三维有限元模型及人工髋关节假体，并模拟全髋置换术进行装配，将坐股韧带按其术中重建位置进行构建骨骼与金属模型采用三维十节点四面体实体单元进行网格划分，关节囊六面体连接单元划分，模拟坐位腿交叉动作载荷获取假体撞击过程的角活动度和相应的von Mises应力分布情况结果所构建的多体连接、大界面划移、大变形的坐股韧带重建有限元模型，客观反映坐股韧带真实解剖形态及生物力学行为，增加坐股韧带重建的模型其关节面的最大主应力值大于仅有金属的模型。

Both of the methods can be used in the isocratic elution of normal temprature in HPLC, and can be used to two, three and four members mobile phase.

利用可视化的编程语言Visual Basic6.0，编写四面体法和单纯形法的计算机优化软件，实现了流动相优化的自动化。

The rest positions of 〓 unit are occupied by water and an oxygen atom of carboxylates from another type of ligand. With two carboxylates of this type of ligand, two ladderlike long chains are connected to form one-dimensional ladderlike chain structure.

第二类配体中每个羧酸根的一个氧原子与水分子饱和四面体结构单元余下的位置，并连接两个梯形长链形成一维梯形链状聚合物。

The split between the two groups can hardly be papered over.

这两个团体间的分歧难以掩饰。

This approach not only encourages a greater number of responses, but minimizes the likelihood of stale groupthink.

这种做法不仅鼓励了更多的反应，而且减少跟风的可能性。