有环的

"Olefins may be classified by whether the double Bond is in a ring or a chain or by the number of double Bonds (monoolefin, diolefin, etc.)."

有两种分类方法︰一、分为环烯烃和非环烯烃，双键依次位于成环碳原子之间或开链基团的碳原子之间。

Ervertebralis of scoliosis goat apical vertebral,there is no significant difference in distribution of any two sections' sympathetic fiber in normal peoples annulus fibrosus disci intervertebralis,and there is significant difference between the sympathetic fiber distribution of convex side and concave side in annulus fibrosus disci intervertebralis of AIS apical vertebral-the sympathetic nerve supply of convex side to gain advantage concave side.

结果成功构建山羊脊柱侧凸模型，研究发现正常山羊椎间盘纤维环四个区的交感神经分布无显著差异；侧凸山羊顶椎区椎间盘凸凹侧纤维环交感神经分布无显著差异；正常人椎间盘纤维环四个区的交感神经分布无显著差异；青少年特发性脊柱侧凸患者顶椎区椎间盘凸凹侧纤维环交感神经分布有显著差异，凸侧明显多于凹侧。

There are 11 known rings and the brightest and outermost ring is called the Epsilon ring.

已知有11环，最聪明和最外层的环称为小量环。

Firstly, the connection matrices are strongly connected Boolean matrix, it is shown that the maximum length of limit cycles for FBAM is the period index of the product of the connection matrices. Thus, the maximum limit cycle is reachable. Secondly, two strongly connected components are connected by walks, it is proved that the maximum length of limit cycles for FBAM is the max. of the period index of the two strongly connected components if they are prime, otherwise, it is the least common multiple of the two period index. Finally, n strongly connected component are connected in succession, the method for computing the maximum length is described. By different patterns are presented to the networks, diminishing the number of the strongly connected components until only two components.

第一，连接权矩阵为强连通布尔矩阵，此时模糊双向联想记忆网络的最大极限环长度为连接权矩阵乘积的周期指数，从而极限环具有可达性；第二，两个强连通分支有路径连接，此时如果两个强连通分支的周期指数互素，那么网络的最大极限环长度为其最大者，否则，网络的最大极限环长度就等于二者的最小公倍数；第三，n个相邻强连通分支有路径连接，给出了计算最大极限环长度的方法，通过激发模式的变化，逐渐减少强连通分支的个数，直到只有两个分支。

The lower end of the discharge chamber body is in hermetically-threaded connection with a fixed electrode; an operation electrode is mounted at the upper end of the discharge chamber body; the lower end of the operation electrode can be movably mounted in a conduction fixed ring; a fit clearance between the lower end of the operation electrode and the conduction fixed ring is 0.1 to 0.15mm; the conduction fixed ring is in hermetically-threaded connection with the upper end of the discharge chamber body; the conduction fixed ring is connected with a grounding wire; a discharge chamber is formed between the conduction fixed ring and the fixed electrode at the inner part of the discharge chamber body; the upper end of the operation electrode is fixedly connected with an insulation handle.

本发明公开了一种隔爆放电器，包括由防爆有机玻璃制成的筒形放电室本体，所述放电室本体的下端密封螺纹连接有固定电极；所述放电室本体的上端安装操作电极，所述操作电极的下端可移动地安装在导电固定环内，与导电固定环配合间隙为0.1～0.15mm，导电固定环密封螺纹连接在放电室本体的上端，导电固定环上连接有接地线；在放电室本体的内部导电固定环和固定电极之间形成放电室，所述操作电极的上端固接绝缘手柄。

Based on the curvature of substrate and Newton ring ,a simple set for measuring the stress in films is designed,which consists of a He-Ne laser,an extended lens,a convex lens and a travelling microscope with a spectroscope.

文章使用M athem atica描绘牛顿环与迈克耳孙干涉条纹，形象地讨论了两条纹产生机理、环纹中心、环纹级次、非单色光环纹及在测量波长时方法等的差异，使教学过程更具有直观性和生动性，加速教学手段现代化进程

The performance of the selected coating systems was experimentally verified,while some of the selected costing systems were brought into engineering practice.As the results,it was suggested to use a coating system composed of zinc-rich epoxy primer,micaceous ferric oxide epoxy intermediate,and modifie...

结果显示，对完全浸泡的设备，采用环氧富锌底漆+环氧云铁中间漆+改性环氧面漆的涂层体系有很好的防护效果；对干湿交替的设备采用环氧富锌底漆+环氧云铁中间漆+丙烯酸聚氨酯面漆的防护体系具有良好的防护性能，预计其防护寿命可达到8a以上。

The structure characters of this kind of molecules were discussed. The results show that the phenyl group located in the 4- or 5- position of pyrryl ring are not coplanar with the pyrryl ring.

对这类吡咯环上4或5-位有芳环取代基时化合物的晶体结构特征进行了扼要讨论，晶体衍射实验结果表明，4， 5-位上的芳环与吡咯环本身处于非共平面结构。

A one-step method for the synthesis of aromatic indolizine derivatives byintramolecular 1,5-dipolar cyclization reaction of 2-(2-arylethenyl)pyridinium N-ylidesin the presence of an oxidant has been studied for the first time. In the presence ofelectron-deficient olefins, however, 2-(2-phenylethenyl)pyridinium N-ylides underwent1,3-dipolar cycloadditions and then aromatized in situ by TPCD to produce indolizinederivatives, indicating 1,3-dipolar cycloaddition proceed more readily than 1 ,5-dipolarcyclization in these conditions. Pyridinium disubstituted N-ylides, readily obtainedfrom corresponding pridinium and β-chlorovinyl ketone, underwent thermalintramolecular 1,5-dipolar cyclization to give indolizine derivatives easily.Indolizinecarbaldehyde derivatives were synthesized starting from 2-pyridinecarbaldehyde in four-steps involving 1,3-dipolar cycloaddition reaction.

本文首次研究了2-(2-芳基乙烯基)吡啶N-叶立德在氧化剂存在下的分子内1，5-偶极环化反应，采用一锅法合成了中氮茚衍生物；研究了这些N-叶立德的1，5-偶极环化和1，3-偶极环加成反应的选择性，发现当有缺电子烯烃存在时，优先进行1，3-偶极环加成反应，而不再发生分子内1，5-偶极环化反应；由β-氯乙烯酮方便地得到了烯丙基N-叶立德，他们在加热时进行分子内1，5-偶极环化反应而得到中氮茚衍生物；由2-吡啶甲醛为起始原料，通过1，3-偶极环加成反应等四步反应，得到了重要的中氮茚甲醛衍生物，这些反应都具有条件温和和操作简便的特点，是合成中氮茚衍生物的新方法。

From the potential energy profile, it can be predicted that, the dominant channel of this reaction consists of three steps: the two reactants first form a three-membered ring intermediate (INT1) through a barrier-free exothermic reaction of 19.2 kJ/mol; three-membered ring intermediate (INT1) isomerizes to a four-membered ring silylene(P2) via the transition state (TS2) with an energy barrier of 22.8 kJ/mol; four-membered ring silylene(P2) further reacts with ethene(R2) to form a silicic bis-heterocyclic compound (P3), which is also a barrier-free exothermic reaction of 132.2 kJ/mol.

用CCSD//MP2/6-31G*方法研究了单重态二甲基亚烷基硅烯与乙烯生成硅杂双环化合物环加成反应的机理，根据该反应的势能面可以预言，该反应的主反应通道有三步组成：第一步是两反应物（R1， R2）首先生成了一三元环中间体（INT1），它是一无势垒的放热反应，放出的能量为19.2 kJ/mol；第二步是三元环中间体(INT1)经过渡态TS2异构化为了四元环硅烯（P2），其势垒为22.8 kJ/mol；第三步是四元环硅烯（P2）进一步与乙烯(R2)反应生成了硅杂双环化合物（P3），该反应也是一无势垒的放热反应，放出的能量为132.2 kJ/mol。

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％。