螺旋

Instantaneous motions of the end effector of the typical industrial serial 6-DOF and 5DOF robots are also studied using reciprocal screw theory, The constrained and permitted motions at special configurations are given. Furthermore, the satisfied conditions for the special configurations are discussed, and in the reference coordinate system general expressions of the reciprocal screw and existed motion screw and the subspaces of the permitted rotational axes are obtained under all circumstances at special configurations.

本文中还用反螺旋理论研究了六自由度和五自由度工业机器人的瞬时运动，给出了它们在正常位形和特殊位形下的受约束的运动和存在的运动，以及它们在所有运动参数的不同组合下的反螺旋及存在运动螺旋系的一般表达式和转动轴线存在的子空间。

Objective To study the effect of helical CT scanning dose and slice thickness on lung density, and to determine whether the lung density value measured by standard dose helical CT scan can be used for low dose helical CT scan.

目的 探讨螺旋CT扫描剂量、层厚是否对肺密度有影响，以决定常规剂量螺旋CT扫描测得的肺密度值能否适用于低剂量螺旋CT。

Being formed by linear grain curved surface, helicoid can be expressed by a group of simple lines. Writing two equations of inside and outside of the helicoid, getting any one of simple line′s equation and from which getting the coordinations of two end points by projection transformation, the CAD system of helicoid is achieved. It...

由于螺旋面为直纹曲面，因此可用它的一组素线表示，用极坐标的形式写出内外两条螺旋线的方程，求出任一素线的方程，并通过投影变换求得素线上两端点的坐标矩阵，进而设计出螺旋面的CAD系统，并将其应用于实践，为设计优化决策提供有力的证据。

The endplate bolted SC beam and CCSHRC column joint and the bar passing force's joint of SC beam and CCSHRC column are the same with SC beam and CCSHRC column structure system, the bar passing force's joint of SC beam and CCSHRC column is audacious innovation of joint types.

端板螺栓连接的组合梁、连续复合螺旋箍混凝土柱节点和连接钢筋传力的组合梁、连续复合螺旋箍混凝土柱节点就是适用于这种体系的节点类型。其中连接钢筋传力的组合梁、连续复合螺旋箍混凝土柱节点更是节点类型中的大胆创新。

According to the helix theories of cylinder,the essential factors of helix with torus are analyzed,and the parametric equation of helix on torus is given based on analytic geometry.

根据圆柱螺旋线理论，分析了形成圆环螺旋线的要素，并运用解析几何方法建立了圆环螺旋线的参数方程。

This study refers to the conditions of practical powder metallurgy manufacture process, and proceeds to experiments and gear precision measurements as well as investigation on the effects of two parameters, powders and pitch circle radius, on gear precision. The relationship between gear parameters and gear surface deviations was derived from the mathematical model for the involute helical gears and the analysis of gear surface deviations.

本论文将采用实际上粉末冶金螺旋齿轮的制程条件，进行试作实验与齿轮精度的量测，以探讨粉末及螺旋齿轮之节圆半径这两个制程参数对於齿轮精度的影响；同时应用齿轮创成原理所推导之螺旋齿轮数学模式，配合齿面变异分析，求得齿轮设计参数改变量与齿面变异量之关系。

The driver consists of magnetostrictive rod, front magnetic pole end cap, back magnetic pole end cap, exciting winding, micro displacement output head, casing, fixed end cap, front end cap, spring, winding tap, flat spiral pipe, water inlet pipe and water outlet pipe. The water cooler of the present invention is formed through inserting one end of some metal pipe into positioning hole of spindle, installing rolling tool onto tool carrier, adjusting the lathe to the pitch of the flat spiral pipe and starting the lathe to complete the extruding formation of the flat spiral pipe.

本发明的驱动器包括有磁致伸缩棒(7)，前磁极端盖(3)，后磁极端盖(10)，励磁线圈(5)，微位移输出头(1)，壳体(12)，固定端盖(9)、前端盖(2)，弹簧(13)，及线圈抽头(11)，螺旋扁管(6)，入水管(8)和出水管(4)；本发明的水冷装置的成型方法为把金属圆管的一端插入芯轴(18)的定位孔(23)中，将滚压工具(20)安装在刀架上，调整车床的加工螺距与螺旋扁管(6)的螺距相等，启动车床，完成整个螺旋扁管的挤压成型。

LI Fu-ming Jiangbei Machinery Plant, Sichuan Province, according to Centrifuge the conical spiral screw blade of the physical characteristics of the establishment of a constant velocity spiral line equation in polar coordinates.

四川省江北机械厂李福明，根据螺旋卸料离心机的圆锥形螺旋叶片的形体特点，建立了等速螺旋线的极坐标方程式。

A principal curve is used to represent the shape feature of every region. Then Hough transform is applied to these curves to detect a logarithm spiral equation which can match the curves well.

首先螺旋云带的提取建立在对云图恰当分割的基础上，从云团的骨架中提取出能够反映螺旋云带特征的局部螺旋线。

Short chain fatty acid, propyl alcohol, methionine and dimethylamide are the possible precursors for spiramycin formation. Addition of 0.6% propyl alcohol into fermentation medium increases the spiramycin productivity by 24%, while addition of short chain fatty acids, methionine, or dimethylamide has a repression effect on spiramycin production.

合成螺旋霉素的前体物质可能有短链脂肪酸、丙醇、蛋氨酸和二甲胺等，在发酵培养基中加入0.6％的丙醇可以使螺旋霉素的发酵单位提高24％，而短链脂肪酸、蛋氨酸和二甲胺对菌体生长和螺旋霉素的生物合成有不同程度的抑制作用。

What are your goals and strategies for growth?

你的成长目标和策略是什么？

And unto the angel of the church in Sardis write; These things saith he that hath the seven irits of God, and the seven star I know thy works, that thou hast a name that thou livest, and art dead.

3：1 你要写信给撒狄教会的使者，说，那有神的七灵和七星的，说，我知道你的行为，按名你是活的，其实是死的。