几何结构

Keywords:steel structure roof; steel tube truss; large cantilever; structure analysis; geometric nonlinear; optimization design

关键词］钢结构屋盖；钢管桁架；大悬挑；结构分析；几何非线性；优化设计

The key technical problem of roughcast in the virtual machining environment is to handle three-dimensional shape, which includes the method of setting up geometrical model of three-dimensional shape of roughcast , the data structure that displays three-dimensional shape, process compiling three-dimensional shape, etc.

在虚拟加工环境中，毛坯的三维图形处理主要包括毛坯三维图形的几何建模方法、三维几何图形的显示数据结构和三维图形的编译处理等，提出了一种能够满足虚拟加工环境的三维图形的数据结构，给出了实现方案，实现了三维图形的环境调入和毛坯的对接等功

For the moment, the optimum scan line length is usually determined by statistical properties of joint space, while, the authors research result indicates that the optimum scan line length does not only rely on statistical properties of joint space, but also on statistical properties of joint trace length and other joint geometry parameters.

当前研究人员一般通过结构面间距的概率特征确定最佳测线长度，研究成果表明，仅依据间距的概率特征确定的最佳测线长度往往偏小，在确定最佳测线长度时还需要考虑迹长等其它结构面几何参数的概率特征。

The structure of the representation is simple, so efficient compression scheme can be applied to encoding the hierarchical topological structure.

参数面片的结构规则，面片之间关联性低，因此能够按任意顺序高效地传输，从而实现真正的视点相关传输，并可以采用有效的编码方法对其结构和几何信息进行压缩。

In studying the extraordinary enhancement of microwave transmission through single subwavelength slit,we also examined the influences of the groove number and the periodical parameters on the enhancement factor in detail.

在研究微波通过亚波长金属狭缝的超强透射实验中，我们还详细研究了表面周期结构数目和表面衍射光栅结构的几何参数对超强透射强度之影响。

Lost foam process is one of the most advanced casting crafts, and it can be applied in different materials, sizes castings such as steel ,iron, aluminum castings.High-quality of casting with precise size and smooth-faced; no special requirement for material; reduced trimming work and mechanical processing; Fewer inner flaws, and more compact structure.Environmental-protecting. Working conditions could be improved greatly; at the same time reduced labor intensity and decreased energy consuming could also be achieved.

消失模铸造工艺充分汇集了实型、法铸造工艺的优点为一体适应于钢、铁、铝等各种牌号各种材质不同结构的大、中、小型各类铸件利用干砂固型复制原型原样铸件几何尺寸的精密度高无飞边、毛刺、冷隔均匀一致表面光洁度接近精密铸造铸件内部结构稳定排除了砂眼、气空、缩松等铸造缺陷该工艺充分利用了环保理念且投资少整个生产过程没有污染。

And the reason that causes the difference of the structural stability was analyzed in terms of comparison their atomic geometries and electronic structures.

通过对不同表面几何与电子结构的比较，初步分析了其结构稳定性差异的产生原因。

By utilizing the concepts and methods developed in Algebra Topology,Algebra Geometry and Algebra Representations,we first depicted the concepts and results of Incidence Algebra which reflects the linear structure of underlying posets and Sheaf theory which reflects the topological structure of underlying poset in the framework of Category Theory.

本文综合运用了代数拓扑、代数几何及代数表示论里发展起来的概念与方法，首先在范畴的框架下，对和偏序集的线性结构密切相关的Incidence代数，及与偏序集的拓扑结构紧密联系的层，进行了刻画。

Firstly, kinetic energy and potential energy expressions are obtained by a series of derivation, considering the extrinsic momentum. In the symplectic system, control equations of longitude and transverse coupling vibrations of rotating elastic structures, or Hamilton canonical equations are described. So the solution of the problem is boiled down to the eigenvalues and eigensolutions in the symplectic space.

首先，从能量的观点出发，通过一系列的理论推导，给出旋转结构的动能和势能表达式，并考虑外动量的影响，从而得到在辛体系中描述旋转结构纵向和横向耦合振动的控制方程，即哈密顿正则方程，于是将问题归结为辛几何空间的本征值和本征向量问题。

The disorder of the thienyl ring and〓 groups in 11, 12 and the disorder of water in the packing of 14 may be responsible for their triboluminescent activities.Ⅲ. A dinuclear triboluminescent complex,〓(15)(where TTA=2- thenoyltrifluoroacetone, PyO=N-oxide pyridine), was synthesised and its crystal structure and triboluminescence spectrum were determined.

X-射线结构分析表明，四个配合物中的铕原子均呈现出八配位的四方反锥几何构型。11、12及13均为有对称中心结构配合物，11、12中的噻吩环及〓的无序以及配合物14晶胞中水分子的无序可能对它们的摩擦发光活性起了很重要的作用。

The labia have now been sutured together almost completely.The drains and the Foley catheter come out at the top.

此刻阴唇已经几乎完全的缝在一起了，排除多余淤血体液的管子和Foley导管从顶端冒出来。

To get the business done, I suggest we split the difference in price.

为了做成这笔生意，我建议我们在价格上大家各让一半。