四边形

This will be the first and last image to demonstrate what I am basically doing throughout the initial modeling process; I started out with a simple rectangular plane with symmetry mode on and I keep on extruding its edges and placing them in their rightful coordinates repeatedly until the entire structure is complete.

这会是第一张，也是最后一张图说明我在整个的建模过程中使用的基本技巧。我从一个开启了对称模式的简单四边形开始制作，不断地将边挤出，然后把它们放置到合适的位置，直到完成整个结构。

The method of building triangular grid model of 3D object surface with plane Delaney triangle is introduced.

三维激光扫描数据般是具有四边形网格结构的影像数据，当多幅扫影像数据合并成整幅影像后重新建立模型时，通也需要建立整幅影像的三角形格网来生成等值。

In complex 1,Cucan be described as a four-coordinated square planar geometry.Compound 8 is the sodium salt of plumbagin and exists as ionic compound.Compounds 9-16 are the rare earth complexes of plumbagin with La,Y,Dy,Sm,Gd,Nd,Erand Eu.Compound 17 is binuclear Y complex.18 is mononuclear Ycomplex with plumbagin and another ligand from Plumbago Zeylanica.Compounds 19-21 are the ternary complexes with plumbagin and 2,2\'-bpy and phen as assistant ligand.In 19, the geometry of Cucan be described as five-coordinated distorted square pyramid that exists in a dimer through the weak bonding,and 1-D chain structure is formed by intermolecular hydrogen bonds.

化合物1的单晶结构分析表明1具有四配位平面四边形结构，化合物8是白花丹素的Na盐，以离子化合物形式存在；化合物9～16为白花丹素的La，Y，Dy，Sm，Gd，Nd，Er，Eu的稀土金属配合物；化合物17是白花丹素的双核钇结构；化合物18为白花丹素的单核钇结构，该配合物除了含白花丹素外，还有来自白花丹植物中的另一个单体化合物也参与配位；化合物19～21是以2，2\'-联吡啶和邻菲咯啉等含N配体为辅助配体，具有白花丹素—含N配体—金属离子的三元配合物，化合物19是白花丹素和2，2\'-联吡啶与Cu的配合物，具有五配位的四方锥构型，通过Cu…O弱的成键作用形成二聚体，再通过分子间的氢键作用进一步形成一维链状结构，化合物20和化合物21是白花丹素分别与2，2\'-联吡啶和邻菲咯啉的Zn配合物，都具有六配位八面体构型的双核锌配合物，呈一维链状结构，化合物20中链与链之间的大量氢键将一维链扩展成二维层，分子间的π-π堆积作用进一步形成三维结构。

Based on the variational principle of virtual voltage and virtual displacement derived in this thesis and the classical theory of linear laminated plates, and by using the constitutive equations of elastic piezoelectric materials, and the DKQ quadrilateral plate bending element, the finite element modeling for the fabric reinforced laminated plates with nonlinear voltage-electric strain relationship of piezoelectric actuators has been established for the first time in this thesis. And the expressions for the electric loadings with obvious mechanical meaning and convenient for computation are established, which can be used to the deformation analysis of laminated plates with piezoelectric actuators under specified voltages.

以本文直接导出的压电结构的虚电势—虚位移变分原理为基础，依据经典线性层合板理论和压电弹性体的本构方程，采用基于离散法线假设的DKQ四结点任意四边形薄板弯曲单元，首次建立了考虑非线性电压—电应变关系的含压电致动器的纤维增强型层合板的有限元分析模型，并推导建立了力学意义明确、便于计算的电荷载表达式，可用于指定电压条件下纤维增强型叠层合成板的变形分析。

First a quad with the center at the bottom origin is presented.

首先是一个中心点在底部的四边形四个顶点的计算公式。

First, because Chinese people are very love quadrangle, and its courtyard of a three-dimensional planning in line with the Chinese people's living.

第一，因为人民是非常热爱四边形，它的庭院立体规划符合中国人民的生活。

A new approach of construction of 3D objects with rotation of 2D convex quadrangle is presented.

提出了一种能用凸四边形表示并可作平面展开的三维实体造型的设计方法。

Some of these people have not lived courtyard, we do not know how to protect the courtyard of this old building, nor on a love quadrangle complex.

其中有些人还没有住的庭院，我们不知道如何保护四合院的旧建筑，也没有一个爱四边形复杂。

Secondly, we research the partition strategy to the existing scene in detail which is based on the regular quadrangle.

其次，对现有的场景分块策略作了详细的研究，现有的场景分块策略是建立在规整的正四边形基础之上的。

This paper gives the principle of a kind of distortion power meter on the basis of the analysis of the power quadrangle.

文章以功率四边形方法为基础，给出了谐波功率测量仪的设计原理。

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。