有环的

In the study of open-loop optimal control problems, a useful tool is the so-called "Pontryagin"s Maximum Principle which gives a set of necessary conditions to optimal open-loop controls.

对于开环控制的研究，在最优控制理论中已经有了Pontryagin最大值原理这个有效的工具，它提供了最优开环控制的一个必要条件。

"We're talking about these closed loops of time, and the simplest kind of closed loops are circles, which is why we have this ring-shaped hole," Ori explained.

"我们讨论的是这些时间的闭环，最简单的闭环就是圆圈。这就是为何我们有了这些环状的洞"Ori解释道。

By using the a device being similar to water segregator and by controlling the temperature, cyclization of the intermediate product in chloroform reduced carbonization and gave 2-dodecaneanthraquinane in 68.1% yielding.

以十二烷基苯和苯酐为起始原料，经酰基化、关环和磺化三步反应合成了3-十二烷基蒽醌磺酸；并进一步改进和优化了合成工艺条件：即在催化剂三氯化铝过量50%并有三乙胺存在的条件下，中间体2-（4-十二烷基苯甲酰基）苯甲酸收率为72.45%；关环反应采用氯仿作溶剂，利用类似分水器的装置有效控制反应温度以减少碳化，2-十二烷基蒽醌的收率为68.1%。

With the development of technology, it maybe possible to generate SR pulse with long interval in large storage ring by this kind of mechanical chopper, but it is impossible in a small ring.

随着技术的发展，采用Chopper有可能在周长很大储存环上产生严格的长时间间隔的SR脉冲，但是对于周长小的储存环，这种方法不可行。

A container (1) containing a coating composition the container comprising a container body (21) and a lid (7), the lid comprising a collar (11) and a disc (12), the container body having an opening provided with a screw-thread (5) cooperable with a screw-thread (6) on the collar and closeable by said lid characterised in that the disc is formed of polyethylene terephthalate which is sufficiently transparent to allow the coating composition to be visible therethrough.

一种容纳涂敷组合物的容器(1)，该容器包括容器主体(21)和盖子(7)，该盖子包括套环(11)和盘(12)，该容器主体具有一设置有螺纹(5)的开口(2)，该螺纹可与该套环上的螺纹(6)配合使用，并且该容器主体可由该盖子封闭，其特征在于，该盘由聚对苯二甲酸乙二醇酯形成，其足够透明以便使得透过该盖子可看到该涂敷组合物。

The introduces binaphthyl bisphenol monomer on side-chain benzene ring of sulfonic group on molecular level, prepares sulfonated poly aryl ether with sulfonic group only on naphthalene ring of side chain, so that ensures chemical stability of main chain with high molecular weight, while having no influence on mechanical property thereof.

本发明从分子水平出发，将磺酸基在侧链苯环上的联萘双酚单体引入，制备仅在侧链苯环上有磺酸基的磺化聚芳醚，从而保证了高分子主链的化学稳定性，且不会影响其优异的物理机械性能。

In this case, the patient has had a ring placed in the mitral valve to repair it; the sutures appear as spots dotting the ring.

在这张图片中，病人的二尖瓣里面已经有了一个用于修复的环，环上的点就是缝合线的痕迹。

Grouts other than epoxy may require alternative surface preparation .full bond-strength of epoxy is not generally necessary.

非环氧砂浆可能有另外要求的表面准备。环氧砂浆的完全结合强度通常是不必要的。

MTT assay indicated that anti-proliferative activities in HeLa, SHIN3, HOAC-21 and HAC-2 cell lines were closely related to structure, 1,10-seco of eudesmane sesquiterpene lactone resulted in reduced anti-proliferative activity. The anti-tumor activity of isoalantolactone was probably achieved by inducing HeLa cell apoptosis.

提示A-环开环可能是导致桉叶烷型倍半萜内酯的体外抑制肿瘤细胞增殖作用消失或减弱的原因；异土木香内酯抑制肿瘤细胞增殖作用有可能是通过诱导肿瘤细胞凋亡机制而实现的。

The demetalation of Ni-OEP in the presence of H2 consists of two steps. The first step is hydrogenation of nickel porphyrin to nickel chlorin, and the second step is decomposition of nickel chlorin and the removal of nickel.

，也有相当一部分镍卟啉发生分解，脱除所配合的金属；镍卟啉的临氢脱金属反应过程分为两步，第一步是卟啉分子中一个吡咯环上的外环双键加氢生成镍卟酚，第二步镍卟酚分解，金属脱除。

In the negative and interrogative forms, of course, this is identical to the non-emphatic forms.

。但是，在否定句或疑问句里，这种带有"do"的方法表达的效果却没有什么强调的意思。

Go down on one's knees;kneel down

屈膝跪下。。。下跪祈祷