螺旋

The central 5, 5'-disubstituted bipyridine units of each ligand coordinate theNi or Fe ion, while all the terminal 6-monosubstituted bipyridine units of the ligands keep free of coordination, as the result trinuclear triple-stranded helicate 〓 can not form. This is considered to be caused by the steric hindrance of the methylene substituents α to the chelating nitrogens of the terminal bipyridine units and the strain caused by linkage mode.

配体L〓与Ag作用得到〓，两个配体链相互缠绕着两个Ag离子周围形成双股螺旋结构并以头尾式排列(见图3)，由于配体中位于配位N原子α或β位的末端甲基或次甲基取代基的空间位阻阻碍了头对头式异构体的形成，也正是由于配体头尾式排列而使Ag双股螺旋得以形成，这一结果表明该螺旋体的组装过程中自发地采取了空间阻碍尽可能小的那个构型。

Electrical screw press works with short transmission chain and it is easy to be maintained.

依据驱动方式的不同，螺旋压力机分为摩擦、液压、离合器和电动螺旋压力机四种类型。

In order to understand the swirl system deeply,the three-dimensional particle dynamic analyzer was used to measure the velocities of the steady turbulent cold flows in the swirl three-branched modular junction located at the end of the exhaust system,and three-dimensional numerical simulation of the flows was carried out by use of the ALE algorithm.

为了深入研究螺旋流排气系统的工作机理，作者利用三维粒子动态分析仪(3D-PDA)，对一始端螺旋流三分支模件的稳态湍流流场进行了测量，并用ALE法进行了三维流动数值模拟。

Moreover, sum up the modeling method and step for tap;The paper focus on the tapping speciality of screw tap, and the influence between geometrical parameters and cutting performance, targeting the minimum tapping and axial force, the optimum design of geometrical parameters is done, especially the flute shape.

论文重点研究了螺旋槽丝锥的攻丝特性及其几何参数对切削性能的影响，基于最优设计原理建立了攻丝扭矩最小及轴向力为零的双目标非线性优化模型，并利用Matlab软件，对螺旋槽丝锥的几何参数，尤其是丝锥容屑槽槽形，进行了优化，根据优化结果建立了丝锥的三维CAD造型。

Nowadays in virtue of the developed CFD simulation analysis software—— STAR-CD ,The flow field of the pure water in the half-spirality suction chamber is simulated.

借助于现在发达的CFD模拟分析软件——— STAR-CD 对半螺旋泵吸入室做了纯水的三维模拟分析之后，又在不同含气率的情况下，对半螺旋形吸入室的流场进行了三维模拟分析。

On the basis of structural features and heat transfer characteristics of a spiral-grooved tube heat exchanger,a three-dimensional geometric model was established for the flow and heat transfer in a heat exchanger with water serving as its working medium.

根据螺旋槽管换热器结构特点及传热特性，建立了以水为工质的换热器流动与传热的三维几何模型。运用有限元分析软件ANSYS模拟出换热器在换热过程中速度场与温度场的状况，分别得到了螺旋槽管内壁与外壁的对流换热系数。

The small-grained spherical copper powder is large in the contact area with the steel base and binds sufficiently and firmly in the process of sintering.

小颗粒球形铜粉与钢基体接触面积大，烧结过程中结合充分、牢固，大颗粒球形铜粉与小颗粒球形铜粉烧结相容性好，结合牢靠，并且大颗粒铜粉之间的间隙大，螺旋铜钉层可进一步加大这个间隙，改性聚甲醛可以深埋在螺旋铜钉及大颗粒铜粉的间隙中，使改性聚甲醛工作更可靠。

Spiral volume tube, compound pot complete equipment: in 1994, Shuangfei company designed the spiral pipe coiling machine, the slitting, curved side machine , the printer and cover machine for the a lot of customer.

螺旋卷管、复合罐成套设备：双飞公司在1994年为还为众多客户设计制造了螺旋卷管机、分切机、印刷机、弯边机、封盖机等复合罐成套设备。

Applied JT5-2 model saw tooth wave duplex jig to replace JT3-1 model single-chamber jig and spiral chutes which handle sand return from the double-spiral classifier,and achieved good index.

提出采用JT5-2型双室锯齿波跳汰机代替JT3-1型单室跳汰机，以及用来选别双螺旋分级机返砂的螺旋溜槽，取得了理想的指标。

I start modeling the snail shell, to do this I use a spiral spline and a circular shape inside a sweep NURBS, I activate it and adjust the spiral parameters to get both the necessary turns and the thickness at the beginning and at the end.

我开始建模蜗牛壳，为此我使用螺旋花键和一个圆形形状内打扫的NURBS ，我激活它，并调整螺旋参数，以获得这两个必要的转折和厚度在开始和结束时。

The split between the two groups can hardly be papered over.

这两个团体间的分歧难以掩饰。

This approach not only encourages a greater number of responses, but minimizes the likelihood of stale groupthink.

这种做法不仅鼓励了更多的反应，而且减少跟风的可能性。