有环的

A novel endocyclic enamine cyclopentenone annulation was discovered and rationalized as an unusual Nazarov-type electrocyclization, which would have broad applications in the synthesis of natural alkaloids and other heterocycles.

我们在合成路线一、路线二中用的6-6元环系到7-5元环系的还原重排反应，在温和的酸性还原条件下即能发生，这说明在三尖杉碱的生物合成中6-6元环到7-5元环的还原重排步骤是非常有可能发生的；因此，我们的合成路线二中可认为是生物合成过程。

Using properties of zero-divisors, regular elements and subdirectly irreducible ring , we obtain some results on the commutativity of semi-prime ring and Jacobson semi-simple ring as follows 1 Let R be a semi-prime ring ,a∈R and 2a is not zero-divisor,If R satisfies one of the conditions in this paper , then R is commutative.

在某些特殊环的交换性方面取得了进一步的结果，并得到了一些新的结论，主要有一设R 为半质环，a∈R ，且2a 为非零因子，如果R 满足论文中八个条件之一，则可以证明环R 为交换环。

A fishing float or cork.In the centre of the ring is a red cross, at the circumference holes for the pegs.

木环中央有个红色十字架，木环的周边有许多小孔，以便把小木橛子插进去。

Ask to satisfy a client and admit need here, the member that decide to be engaged in an environment affecting pricer at drafting invite applications for a job 2009 here counts a name, specific requirement is as follows: One, object of invite applications for a job and condition Apply for personnel to need to annulus judges engineer card or annulus to review mount guard evidence, major is the environmental project, personnel that is engaged in annulus evaluate work making now first consideration.

为满足客户要求和我处发展需要，我处决定于2009年拟招聘从事环境影响评价的人员数名，具体要求如下：一、招聘对象及条件应聘人员需有环评工程师证或环评上岗证，专业为环境工程、现从事环评工作的人员优先考虑。二、应聘人员注意事宜： 1、引进人员相关待遇参考省内环评专业科研院所，人员为长期聘用制，签订聘用合同。

In [8, 10, 11], Hwang, Chen, and Wright proposed the directed version of the undirected chordal ring network and derived the diameter of a directed chordal ring network.

在文献[8， 10， 11]中，黄光明老师、陈尚宽学长、以及Wright，将「无向的弦环式网路」推广成「有向的弦环式网路」，并给出计算「有向的弦环式网路」的直径的方法。

It shows that Iridoids composition of Valeriana jatamansi Jones have inhibit function on gastrointestinal function of normal mice.1.2 Effection of Iridoids composition of Valeriana jatamansi Jones on gastrointestinal function of mice with reserpineMethods:Compared with normal group,model group and YJBH group,mice with reserpine which has given Iridoids composition of Valeriana jatamansi Jones as 71.2mg/kg,35.6mg/kg,17.8mg/kg,8.9mg/kg was detected gastric emptying and small intestinal propulsion after 6 days drug given.

结果：蜘蛛香环烯醚萜35.6mg/kg、17.8mg/kg组能减缓胃排空和小肠推作用(P.05)，说明蜘蛛香环烯醚萜对正常小鼠胃肠功能有一定的抑制作用。1.2蜘蛛香环烯醚萜对利血平化小鼠胃肠功能的作用方法：小鼠每日腹腔注射利血平造模，同时灌胃给予蜘蛛香环烯醚萜71.2mg/kg、35.6mg/kg、17.8mg/kg、8.9mg/kg与空白组、模型组和越鞠保和丸组对照，给药6日后测定动物的胃排空率和小肠推进率。

The results of calculation will be fundmentally consistent with the experimental values.In addition, we calculated dibenzene chromium and its derivatives, ferroceneand its derivatives. The former had higher symmetry. We studied the substituenteffects by calculating their NMR spectra. The results show that: when we add asubstitute group on one ring of dibenzene chromium, the substitute group will affecttwo benzene rings. The effect is similar to the effect of branched alkanes, namely:the effect on neighbouring groups has transmissibility. Furthermore, the nearer theneighbouring group is, the stronger the effect is. This effect is observed not only onthe substituted ring, but also on the unsubstituted ring.

此外，我们重点计算了二苯铬及其衍生物和二茂铁及其衍生物的核磁共振谱，其中二苯铬及其衍生物选择的是对称性较好的体系，通过计算其核磁共振四川师范大学硕士学位论文谱，探讨其取代基效应，结果表明：在二苯铬的一个环上引入取代基后，取代基对两个苯环的影响，类似于支链院烃引入取代基后的影响：即对邻近基团的影响有传递性，并且对离得近的作用强，对离得远的作用弱，这种作用不仅体现在连有取代基的环上，也体现在没有带取代基的环上。

At the same time, the electric potential and the electric intensity at the central axes and in the distance area of the charged ring are discussed.

本文中我们运用椭圆积分法计算出了均匀带电圆环空间电位和电场分布，使我们对其产生的电位和电场有一个全面了解。1均匀带电圆环的电位均匀带电q的圆环半径为b，以环心。

These hairline cracks sometimes develop over time in high-strength aluminum alloy and may reduce carabiner strength by more than 50%.

使用时检查钩环的开口附近是否有损坏，这些小破损有时候会出现在高强度的铝合金上，可能使钩环的强度降低50%，有裂缝或明显损坏的钩环应该丢弃。

China Index Research Institute, according to the latest monitoring information center, in May of 30 major cities nationwide, the turnover ratio or the largest area of Central for Hangzhou to 55.65%, which increases chain has more than 10% of 17, accounting for the total urban more than half of the number; ring or at more than 5-10 percent of the city a total of between 10; chain fell only Baotou and Chongqing, Central declines were 28.89 percent and 15.75 percent, showing the vast majority of cities in the country in May traded residential area there has been a marked increase.

据中国指数研究院信息中心的最新监测，5月份的全国30个主要城市中，成交面积环比涨幅最大的为杭州，达到55.65％，其中环比增幅超过10％的就有17个，占到总城市数量的一半以上；环比涨幅位于5％至10％之间的城市共有10个；环比下跌的只有包头与重庆，环比跌幅分别为15.75％与28.89％，可见5月全国绝大多数城市住宅成交面积都有明显的上升。

It has been put forward that there exists single Ball point and double Ball points on the symmetrical connecting-rod curves of equilateral mechanisms.

从鲍尔点的形成原理出发，分析对称连杆曲线上鲍尔点的产生条件，提出等边机构的对称连杆曲线上有单鲍尔点和双鲍尔点。

The factory affiliated to the Group primarily manufactures multiple-purpose pincers, baking kits, knives, scissors, kitchenware, gardening tools and beauty care kits as well as other hardware tools, the annual production value of which reaches US$ 30 million dollars.

集团所属工厂主要生产多用钳、烤具、刀具、剪刀、厨具、花园工具、美容套等五金产品，年生产总值3000万美元，产品价廉物美、选料上乘、质量保证，深受国内外客户的青睐