查询词典 torsion

For the application of Mathematica in the differential geometry,this paper introduces how to processe the curve curvature and the torsion questions,the graphic expression of the curvature and the torsions,and draw curves by the curvature and the torsions. Curvature ; torsion ; solution curve ; osculating plane ; natural parameter ; natural equation

利用Mathematica，只要输入有关系统命令就可以得到期望的结果。1曲率和挠率及其图形意义假设R3上的曲线一般参数表示为r=r它的曲率和挠率计算公式是：κ=‖r′×r"‖‖r′‖3τ=‖r′×r‖我们知道，空间曲线r=r在一点(s=s0)邻近的近似方程为ξ=sη=120κs2ζ=160κ0τs3通过近似方程可以确定曲线在其基本三棱形的三个平面(即密切平面，法平面，从切平面)上的投

In reparametrization with arcs length, the curvature and torsion is invariant to translation and rotation transformation. The curvature and torsion are views as feature sets.

无论是二维碎片物体还是三维碎片物体的形状复原问题，皆看成是特殊的物体识别问题，其特殊性就是在处理的方法上采用基于轮廓线的匹配来识别。

RESULTS: The biomechanical parameters (maximum torsional momentque, torsion angle and shearing elastic modulus) of Wistar rat's femur irradiated with 15 and 20 kGy were almost the same with that of control group in torsion test.

结果：15，20 kGy辐照组与未辐照组扭转试验的生物力学测试最大转矩、扭角和剪切弹性模量结果相近，差异无显著性意义。

Employing the Hopkinson torsion-tension combination bar system, the constitutive relations of soft aluminum under torsion-tension combined high strain—rate was obtained, The constitutive relations of Monel alloy under Dual—direction shearing high strain—rate was also investigated after special modification of above apparatus.

本文还利用分离式扭—拉复台霍布金森杆设备测试软铝在高应变率扭—拉复合载荷作用下的本构关系，并将该设备经特殊改装测试了蒙纳尔合金在高应变率双向剪切下的力学特性，目前也尚未见这方面的公开资料。

Objective: To evaluate the diagnosis and treatment of testicular torsion and spermatic cord torsion, and to improve its diagnosis and treatment.

目的：探讨睾丸和精索扭转的诊断与治疗方法，提高睾丸和精索扭转的治疗水平。

Methods: The clinical data of 68 cases of testicular torsion and spermatic cord torsion were summarizd and analyed.

对68例睾丸和精索扭转的临床资料进行总结，68例平均年龄21岁，0岁者占84%，左侧55例占80.8%，发病至确诊时间6h~30天，12h以上者占90.2%。

The influence of arrangement of the anti-sideways elements on the structural tor- sion was discussed. The formula of structural torsion stiffness was given. The method to decrease the structural torsion effect was found.

考察了抗侧力构件布置对结构扭转效应的影响，给出了结构抗扭效应近似计算中扭转刚度的计算公式，通过参数分析，分析了结构抗扭刚度的影响因素，指出了减小结构抗扭效应的途径。

By applying one couple of unit force on two suspension centers based on 3D FEM to calculate their relative displacement, coefficient of torsion displacement, the radial gate s torsional rigidity coefficient is derived; and its stress distribution is analyzed to solve radial gate s torsion problem.

基于空间有限单元法，对闸门吊点施加1对单位力计算出2个吊点的相对位移———闸门扭转挠度系数，进而推算出闸门抗扭刚度系数和单位位移下的应力状态，据此最终解决弧门的扭转问题。并通过某一工程实例的分析计算，表明该方法在生产设计中具有较好的实用性，可以有效地解决弧形闸门的扭转计算问题

An analytical method is proposed for calculating free torsion constant of complicated thinwalled cross section from free torsion theory.

通过自由扭转理论推导出复杂薄壁箱梁断面的自由扭转惯性矩的计算方法；采用实际复杂薄壁箱梁断面进行了数值验证，并和使用有限元方法计算的结果进行了比较。结果表明，这是一种简单实用且精度较高的计算方法

In consider drilling rod state, hole state, creep into course influence foundation of parameter synthetically, the drilling rodmodel under acting on the pulling force and torsion together carries on the theory to calculate, receive drillingrod pulling force and torsion differential equation group, in order to benefit drilling rod strength further to analyse.

在综合考虑钻杆状况、钻孔状况、钻进过程参数的影响基础上，对拉力和扭矩共同作用下的钻杆模型进行理论计算，得到钻杆拉力一扭矩微分方程组，以利于钻杆受力的进一步分析。

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