可循环的

The circulant structure of the circulant matrices provides an effective method for the stability analysis of the switched hypercycle systems.

循环矩阵的循环结构为研究切换超循环系统的稳定性提供了有效的方法，给出切换线性时变超循环系统在任意切换律下渐近稳定的充要条件和切换线性定常超循环系统可切换镇定的充分条件。

This language can be extended when components are well designed. By the introduction of a data type conversion function in the edge design and can-connect function in input terminal, the extended data flow language successfully solved the data conversion between different data types. It is a difficult problem in data flow language to realize conditional jump and recursion, however, by using the mechanism of active condition, this dissertation solves the problem well.

相比其它现有的数据流语言，扩展数据流语言具有以下特点：元件设计中定义了一种可激活函数，不同类型的节点允许定义各自的可激活条件，通过合理设计虚拟仪器元件，可以扩展语言的功能；在边的定义中引入类型转换函数，在输入端的设计中引入可连接函数，从而解决了不同数据类型之间数据传递的问题；在数据流语言中实现条件分支与循环通常是具有挑战性的一个问题，本文采用可激活函数的机制给出了一种解决方法。

Let F=LF be a s-closed local formation such that every minimal non-F-groups is solvable. It is proved that 1 If every cyclic subgroup of of order 4 and every minimal subgroup of G are contained in, then G is a F-group. 2 If there exists a normal subgroup N of G such that G/N∈F and every cyclic subgroup of N of order 4 is weakly c-normal in G and every element of N of prime order is contained in Z(superscript f subscript ∞), then G is a F-group.

设F=LF是一个子群闭的局部群系，满足每个极小非F-群是可解群，证明了：1如果G的任意极小子群和任意4阶循环子群都含于Z中，那么G是F-群；2如果存在G的正规子群，使得G/N∈F，且N的任一4阶循环子群在G中弱c-正规，N的任一素数阶元含于Z中，那么G是F-群。

These animals,which threshold of auditory nerve compound active potential and cochlear microphonic potential heightening evidently,showed that the amplitude of endolymphatic potential bring down in various degress,which was related to the change of the active of Na+-K+-ATPase and SDH in vascularis stria and endolymphatic sac.

研究证实，同种内耳抗原(isologous inner ear antigen，IIEAg)免疫可造成ASHL动物模型；并行体液与细胞转移免疫均获得成功；针对内耳组织的特异性抗体和淋巴细胞可经体液循环到达内耳局部；内淋巴囊(endolymphatic sac，ES)在其中起着重要作用〔1～4〕。

Secondly, as to the improvement of cycle life of mercury-free RAM, Calcium zincate, barium zincate and strontium zincate samples were synthesized by a chemical method and used as negative electrode additives in mercury-free RAM for the first time.

其次，在改进无汞可充碱锰电池循环寿命方面，采用化学方法合成了锌酸钙、锌酸钡和锌酸锶样品，首次将其用于无汞可充碱锰电池的负极添加剂。

Background--Percutaneous aortic ale replacement represents an endoascular alternatie to conentional open heart surgery without the need for sternotomy, aortotomy, or cardiopulmonary bypass.

背景—经皮穿刺主动脉瓣置换术可作为传统开胸心脏手术的替代治疗方法，可避免开胸术、主动脉切开术或者体外循环。

The abdominal wall in the left lower quadrant, 2 finger breadths (3 cm) cephalad and 2 finger breadths medial to the anterior superior iliac spine, has been shown to be thinner and with a larger pool of fluid than the midline and is usually a good choice for needle insertion for performance of a therapeutic paracentesis.27 The right lower quadrant may be a suboptimal choice in the setting of a dilated cecum or an appendectomy scar.

在过去，常常将腹部正中线耻骨与肚脐中间定为穿刺点，现在，由于腹腔穿刺引流大量液体以及腹中部脂肪厚度增加，左下腹成为腹腔穿刺部位（表1），在左下腹部中线至髂前上棘连线上2指宽（3cm）与距髂前上棘2指宽，已经显示较中部脂肪少及腹水较多是治疗性腹腔穿刺好的首选部位27，在盲肠有扩张或阑尾切除术后瘢痕时右下腹是次选的穿刺部位，应避开腹壁下动脉，这些血管走行在耻骨与髂前上棘之间的中线然后在腹直肌中向上行走，，腹壁可见的侧支循环亦应该避开，腹腔镜检查发现侧支循环可出现在中线并且在腹腔穿刺时有导致血管破裂的风险28。

Its thermodynamic characteristic is gimilar to R410A. Contrast experiments by air enthalpy difference method are performed. Experimental results indicate that without modification to system components, cycle performances of M3 are close to R410A. Its cooling capacity is slightly smaller than R410A. It has a greater COP and low power consumpt...

在标准的空气焓差实验台上对M3、R410A进行了对比实验，实验结果表明，在不改动系统部件的情况下，新工质M3可保证R410A系统的循环性能基本无大的变化，其循环性能接近R410A，制冷量稍小，但COP值大，耗功少，具有替代新系统中R410A的潜力。

By sorting out and summarizing the theories of resource efficiency revolution to make systematical epagogic elaboration on overseas references of 4 factor revolution,10 factor revolution and resource efficiency indexes,and an overview on reference of resource efficiency by domestic scholars and scientific econometric analyses on emergy theories.

在总结前人研究成果的基础上，定义了资源效率革命的概念，提出了资源效率革命具有目标性、根本性、革命性和倍数性的特征；分析了资源效率革命的理论基础是可持续发展理论、循环经济理论，提出循环经济的核心是资源效率革命的观点并进行了深刻剖析。

Based on an analysis of distribution pattern of hydrocyclone"s axial velocity, by changing the inlet flow rate Qi and split ratio Fand making an investigation in the effect of Qi and F on axial velocity field, the factors causing the forming of short-cut circuit and circulating flow are found. It is considered that the short-cut circuit and circulating flow are produced by the structure of the hydrocyclone, and can"t be eliminated completely, though they interfere the flow field inside a hydrocyclone and affect the separation accuracy. Test results show that, by increasing Qi and F and controlling them in a certain range, the separation efficiency of the hydrocyclone can be improved.

在研究旋流器轴向速度分布规律的基础上，分析了短路流与循环流的形成原因，试验研究了改变操作参数，即改变入口流量Qi与分流比F对轴向速度场的影响认为短路流与循环流是由旋流器结构决定的，很难完全消除，它们干扰了旋流腔和大锥段的流场，在一定程度上也影响了分离精度试验结果表明，加大入口流量Qi与分流比F，并将其控制在一定范围内，便可提高分离效率这项研究对水力旋流器分离机理的认识与实际应用均有重要意义

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