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According to the properties of substituted thiourea derivatives,4 symmetric and 12 unsymmetric thiourea compounds were synthesized by reaction of alkyl amine or substituted aniline with carbon bisulfide or some isothiocyanates .

针对不同活性的取代硫脲，采用脂肪胺或取代苯胺与二硫化碳或不同种类的异硫氰酸酯反应，合成了4种对称的和12种非对称的硫脲衍生物。

On plane carrier, the left hand MTL realizes series capacity and shunt inductance directly with features of compact structure, easy of manufacture, small size, low loss, and capability of applicable to microstrip IC. The MTL possesses symmetric structure, multiple adjustable parameters so as to suit requirements by different performances and different applications easily.

本发明的左手传输线在平面载体上直接实现了串联电容和并联电感，结构紧凑，易于加工，体积小，损耗低，能够直接应用于微带集成电路；且具有对称结构，可调参数多，可以容易地实现工作频带的调节以适合不同性能要求，实现不同应用。

The main ingredient is the passage from the Cartesian coordinates to the radially symmetric coordinates.

从笛卡尔坐标系到径向对称坐标系的变换是本部分的一个重要环节。

A new design for a 3-DOF parallel manipulator has been conceived in the form of the architecture of the Cassino Parallel Manipulator [3] by using four-bar linkages in the legs and a symmetric design in order to obtain a user-friendly design and easy operation, although parallel manipulators may have complex design and nonintuitive operation.

一台3－DOF 并行操作器的一种新设计已经被以Cassino 并行操作器的建筑的形式设想 [3]为了获得一种便于用户操作的设计和容易的经营通过在腿和一种匀称的设计里使用4 间酒吧的连杆，虽然并行操作器可能有复杂的设计和nonintuitive 操作。

Furthermore, it can be changed into singular integral equations with Cauchy kernel by introducing Sherman transformation. Then , the numerical example of the elastic welding problem with symmetric cracks is given, and the stress intensity factors can be obtained.

通过应用平面弹性复变方法，把满足已知边界条件的弹性平衡问题转化为解析函数的边值问题，再通过引入Sherman变换，把边值问题化为Cauchy核的奇异积分方程组。

With the methods of conformal mapping and the Cauchy integral, two cases of crack geometries are studied: one is for a crack emanating from a circular hole and the other is for two symmetric cracks emanating from a circular hole.

利用保角变换和 Cauchy 积分的方法，对含有圆孔孔边单裂纹和双裂纹的压电弹性体分别进行了分析。

The diagonalization of the Cauchy kernel is one of the most important theorems in the theory of symmetric functions.

Cauchy核的对角化是对称函数理论中最重要的定理之一。

A symmetric image encryption algorithm that has a 128 bit key was proposed based on cellular neural network and coupled map lattice model.

基于细胞神经网络和耦合映像格子模型，提出了一种密钥长度为128 bit的对称图像加密算法。

The results show that the flow is not symmetric about the weld centerline.

结果表明，塑性金属流动关于焊缝中心并不对称。

Inaddition,we propose a so-called symmetric random weighting method to deal withthe case when the third central moment of underlying population is zero.

此外，我们还提出了所谓的对称随机加权法以处理总体三阶中心矩为零的情形。

On the other hand, the more important thing is because the urban housing is a kind of heterogeneity products.

另一方面，更重要的是由于城市住房是一种异质性产品。

Climate histogram is the fall that collects place measure calm value, cent serves as cross axle for a few equal interval, the area that the frequency that the value appears according to place is accumulated and becomes will be determined inside each interval, discharge the graph that rise with post, also be called histogram.

气候直方图是将所收集的降水量测定值，分为几个相等的区间作为横轴，并将各区间内所测定值依所出现的次数累积而成的面积，用柱子排起来的图形，也叫做柱状图。