查询词典 polyhedron

Last,a new method is presented to recognize simple polyhedron from a line drawing.The method filters the candidate database before matching line drawing and model,so the recognition efficiency is improved greatly.

提出一种从单幅线图识别简单平面立体的新方法，该方法在匹配待识别线图与模型结点之前，先用拓扑信息进行候选模型的筛选，大大提高了识别的效率。

In this paper,three problems are researched.First,a method for recognizing triangle and quadrangle is introduced based on geometry and angle constraint.Then Attribute Relation Graph is employed to describe simple polyhedron and line drawing.

依据投影几何中的距离约束和角度约束，给出了三边形和平行四边形的识别方法；提出用属性关系图表示平面立体和线图，该描述方法是一种结合表面特征和几何特征的方法。

Single curvature polyhedron ; Spherical tank ; High temperature bulging ; Temperature distribution ; Numerical simulation

单曲率多面壳体；球形容器；高温胀形；温度场；数值模拟

Meshes are built which mainly are uncontinuous, complete unconstructed hexahedron, partially unconstructed polyhedron, near wall boundary layer mesh is adopted which can fit complicated geometry surface of cooling system well and guarantee mesh quality, in addition partial refinement technology is used to make mesh better in some key location.

网格主体采用非连续的、完全非结构化的六面体，部采用非结构化的多面体网格，对于壁面附近采用边界层网格处理，这样网格既能很好地适应冷却系统复杂的几何表面，又进一步了保证网格质量，另外利用局部加密技术对重点区域进行处理使网格更加完善。

Technology innovation and achieve a major breakthrough in the technology, developed a high-quality products, products mainly include: watch glass, glass cell phone, MP3 glass, glasses used by the industry Cylindrical milling round, precious stones, stone electronic magnetic materials industry Used by forming round, processing the polyhedron-shaped plane used by the disc, film processing mill surface grinding head, bit, and so on.

技术不断创新，实现了技术的重大突破，开发出了高品质的产品，产品主要有：手表玻璃、手机玻璃、MP3玻璃、眼镜行业的所用的外圆磨边轮、宝石、石材电子磁性材料行业所用的成型轮，加工民形多面体所用的平面磨盘、磨片加工曲面的磨头，钻头等。

Some key algorithms were researched here: a "cut-and-sew" algorithm was presented here to resolve the reconstruction problem of adjacent section contour lines which different from shape and polygon vertex count; a random polygon triangulation algorithm based on CDT was studied to resolve the modeling problem of complex geological model with stones and holes inside; a grid-constraining algorithm of judging whether a point is in a polyhedron was studied here to construct the corresponding geological block model which constrained to wire frame model.

研究了构模过程中的若干关键算法：提出"切开-缝合"算法，解决了形状和顶点数目差异较大的相邻剖面轮廓线重构三维形体模型问题；研究了基于约束Delaunay三角剖分的任意多边形三角剖分算法，解决了含夹石或孔洞的复杂地质体构模问题；研究了判断点在多面体内的网格约束算法，以线框模型为约束构建了相应的地质块段体模型。

The coordination polyhedron around Ce3＋ is a distorted square antiprism, and the two independent molecules are connected by π-π stacking interactions to form a noncentrosymmetric dimer.

中心Ce3＋的配位多面体为变形双帽四方反棱柱，两个分子之间以π-π堆积连接，生成一个非中心对称的二聚体。

The neighbor-ing two Gd3+ ions are connected by two simple bridged carboxyl groups and a μ2-bridging carboxylgroup. Each G-d3+ ion is simuetaneosly coordinated by two water molecules. So the coordination num-ber of Gd3+ is nine, forming a coordination polyhedron of distorted mono capped square antiprism.

相邻Gd3+离子通过2个简单羧基桥和1个μ2羧基桥联结起来，还有2个水分子配位于每个Gd3+离子，所以Gd3+的配位数为9，形成变形的单帽四方反棱柱体。

There exists isomorphous replacement in the rutile structure, and the most prominent feature is the average content of oxides, being 1.22%, 0.39%, 0.35% and 0.22% for V 2O 5, Fe 2O 3, ZnO and CuO respectively. They substitute Ti 4+ in octahedra. The valence of V is 5, and its polyhedron is trigonal bipyramid, which causes the lattice distortion, breaks the raw octahedron symmetry into square bipyramid, and produces the microstrains in the structure.

天然含钒金红石平均含V2O5可达1.22％，Fe2O30.39％，ZnO0.35％，CuO0.22％，这些金属离子可替代八面体中Ti^4 。V以5价形式存在，配位多面体呈三方双锥，其在晶格内部对Ti的替代导致晶格畸变，打破了配位多面体原有的八面体对称而呈四方双锥的几何形态，并产生结构微应力。

X-ray single crystal analysis of a new paramagnetic manganese complex with DTPA-BpABA (a DTPA- bisamide derivative), Mn·4H2O, shows that four oxygen atoms and three nitrogen atoms from the ligand coordinate to Mn cation, forming a seven-coordinate distorted pentagonal bipyramid polyhedron.

采用X-射线单晶衍射法对锰与DTPA-BpABA(DTPA-二酰胺衍生物)形成的一个新的顺磁性配合物Mn·4H2O进行了结构测定。

Further more, the simplified analysis method on stressed-skin effect of corrugated steel sheet is also discussed in detail.

此外还比较详细地探讨了蒙皮效应的简化分析方法。

If I had known her telephone number,I would have called her.

要是我知道她的电话号码，我就打电话给她了。