两对称

The two-dimensional structural units (such as silicon-oxygen tetrahedral sheet, octahedral sheet), interlayer space are assembled according to the sphere close packing manner, and the close packing layers parallel to {0001}. There are several mechanisms to release the difference in size while the silicon-oxygen tetrahedral sheet and octahedral sheet assemble the TO and TOT-type structural layers. The two types of structural layers with different interlayer space fitted together in six kinds of assembling modes and formed six kinds of crystal layers. The combinatorics analysis of the two-dimensional structural units revealed that there may be 28 kinds of TOT type interstradified minerals in six kinds of polysomatic assembling modes of interatradified structure. The structural layer is symmetrical for octahedron sheet in the structure of interstratified minerals and shows polarity characteristics.

结果表明，不同二维结构单元体（包括硅氧四面体片、八面体片、层间域的构筑基本符合球体紧密堆积原理，紧密堆积层平行{0001}；四面体片与八面体片构筑TO和TOT结构层时采取多种机制消除二者在二维尺寸上的差异；两种模式的结构层与不同类型的层间物组装形成六种组装模式的晶层；并通过二维结构单元体的组合规律的分析，计算出可能存在的28种TOT型间层结构，它们分属于6种间层结构多体性组装模式；间层结构中，结构层对于八面体片是不对称的，并在属性上表现出极性特征；间层矿物的晶层类型可用6种多体性组装模式加以表达。

The synthesis of designed for an organizing functionalized system by supramolecular interaction is emphasized. We have designed three series of compounds and explored their properties.1 Two asymmetry derivatives from pyridinium and their complexes have been synthesized and characterized.

合成了两种不对称吡啶衍生物，将它们和硫氰酸盐组装成了三种配合物，得到了三个配合物单品，并分别用红外、核磁、电喷雾、单晶解析现代化学手段进行了表征，研究了它们的固体荧光性质。

Using finite element method, this paper investigates the influences of two deformed symmetrical double ridged,, waveguides on their transmission characteristics.

文章采用有限元法研究了圆形和椭圆形两种变形对称双脊波导对传输特性的影响。

In this thesis, two synthetic routes for the incorporation of sugar moiety into C5(5") or C3(3") of salicylaldehyde part of Salen Mn complex were designed and several corresponding compounds were prepared, as carbohydrate derivatives are widely used in asymmetric catalytic reactions.

鉴于糖类衍生物在不对称催化反应中的广泛应用，设计了两条分别在Salen Mn配合物水杨醛部分C5(5′)、C3(3′)位并入糖基的路线并合成了相应的化合物。

The method is based on a variable structure to control the SVC, wherein, the variable structure control method comprises two aspects of the unbalanced load equalization compensation and the parameter control of a PI controller, wherein, the unbalanced load equalization compensation adopts the SVC compensation susceptance computational method which is based on the synchronous rotation reference coordinate transformation of a virtual symmetrical three-phase system; meanwhile, in the stabilization control of the system voltage, the ant colony algorithm optimization method is adopted to real time adjust and to optimize the parameter kp and ki of the PI controller.

本发明公开了一种静止无功补偿器的不平衡补偿和蚁群优化方法，基于变结构对静止无功补偿器SVC进行控制，其中变结构控制方法包括不平衡负荷平衡化补偿和PI控制器的参数控制两个方面，其中不平衡负荷平衡化补偿采用基于虚拟对称三相系统的同步旋转参考坐标变换的SVC补偿电纳计算方法；同时在系统电压稳定控制时，采用蚁群算法优化方法，对PI控制器的参数kp、ki进行实时调整、寻优。

A wind- and motor-powered land vehicle with a fore-and-aft longitudinal axis comprising a body supported by wheels, at least one of said wheels fixed to rotate in a plane parallel to the fore-and-aft axis of said vehicle, an airfoil system comprised of two vertically extending airfoils rigidly mounted on said body in an arrangement having bilateral symmetry about a vertical plane through said fore-and-aft axis, said airfoil system providing a forward propelling force of said vehicle when the airfoil system is subjected to certain cross wind conditions, and self-contained motor propulsion means on said vehicle for providing acceleration from a stationary position and for propelling the vehicle either independently or in combination with propelling forces generated by wind action on said airfoil system, each airfoil having a plurality of airfoil sections telescopically fitted together, the lower airfoil section being rigidly mounted in fixed relationship to said body, said airfoil system including a retracting mechanism for lowering upper airfoil sections of said airfoil system when desired and for subsequently extending said airfoil system, said retracting mechanism including a plurality of linkages interconnecting said sections and an actuator means operatively connected between said body and to said linkages for lowering and extending each airfoil, and an intermediate airfoil extending between the upper sections of each of said airfoils so as to provide an inverted U-shaped airfoil.

风力和电动机驱动的陆地车辆与前列和尾部长轴组成的一个机构的支持，车轮，至少有一说，车轮固定在一个旋转平面平行的前列和前后轴的说，车辆，翼型系统组成的两个垂直扩展翼型硬性安装在说，机构在安排后，双边对称约一垂直面说，通过国内外和前后轴，表示翼型系统提供了一个向前推进的力量说，车辆时，翼型系统是受到某些横风条件下，和自我载电机推进的手段就表示，车辆提供加速从一个固定的立场和为推进车辆单独或结合，与推进力量所产生的风的行动表示翼型系统，每个机翼有一个多元化翼型第telescopically装在一起，较低的翼型节被硬性安装在固定的关系，说身体，说翼型系统包括一个撤消的机制，降低上翼型章节说，翼型系统时，理想的和其后再将说，翼型制度，说收回机制包括多元化的联系互连说，部分和一个致动器的手段手术之间的连接说，身体和说，联系降低，并延长每翼型，及一个中间翼型延长之间的路段上的每说翼型，以便提供一个倒U -形翼型。

Both were measured using X-ray single crystal diffraction. For the crystal in MeOH, X-ray in compound. In an ansymmetry unit, there are two Cu atoms, two ligands and twosolvent methanol molecules. The tetranuclear complex contains two kinds of Cucenter.

本文在MeOH中得到了阶梯型四核铜骨架配合物；在THF中得到了扭曲的立方烷型四核铜骨架配合物，经晶体结构分析表明，阶梯型四核铜骨架配合物是由两个Cu2被μ~3-剪刀撑二个醇羟基O所连接形成中心对称的二铜二聚体结构。

The chiralMn complexes, especially Jacobsenscatalyst, display high enantioselectivity for asymmetric epoxidation of conjugated cis-di-, tri-and some tetrasubstituted prochiral alkenes in the NaClO biphasic system, but the epoxidationreaction generally requires a long reaction time even in the presence of an axial ligand.

在NaClO两相体系中，手性Mn配合物，尤其是Jacobsen催化剂，对共轭顺式二取代、三取代和部分四取代烯烃的不对称环氧化具有高的对映选择性，然而即使存在轴向配体，环氧化反应也通常需要长的反应时间。

The chiralMn complexes, especially Jacobsen\'scatalyst, display high enantioselectivity for asymmetric epoxidation of conjugated cis-di-, tri-and some tetrasubstituted prochiral alkenes in the NaClO biphasic system, but the epoxidationreaction generally requires a long reaction time even in the presence of an axial ligand.

在NaClO两相体系中，手性Mn配合物，尤其是Jacobsen催化剂，对共轭顺式二取代、三取代和部分四取代烯烃的不对称环氧化具有高的对映选择性，然而即使存在轴向配体，环氧化反应也通常需要长的反应时间。

One back pocket must be unstich after washing process,and then sewed with the fabric unblended,both pockets must be placed uniformly

一个后袋水洗后再用不一样的面料缝制，但是两个袋必须对称

Breath, muscle contraction of the buttocks; arch body, as far as possible to hold his head, right leg straight towards the ceiling (peg-leg knee in order to avoid muscle tension).

呼气，收缩臀部肌肉；拱起身体，尽量抬起头来，右腿伸直朝向天花板（膝微屈，以避免肌肉紧张）。

The cost of moving grain food products was unchanged from May, but year over year are up 8%.

粮食产品的运输费用与5月份相比没有变化，但却比去年同期高8％。