圆柱

In the analysis, a nonlinear wave vibration equation of the thin cylindrical shell including damping and items due to geometric nonlinearities was established and then transformed by Galerkin's method. With different combinations of modes different nonlinear differential equations in modal coordinates were obtained. The Runge Kutta method was used to solve the equations numerically and some features of nonlinear wave vibration were discussed.

在研究过程中，首先，考虑阻尼并引入几何非线性项，建立薄壁圆柱壳的非线性波动方程，然后，采用Galerkin方法对波动方程进行转换，选取不同的模态组合，得到相应模态坐标下的非线性微分方程，最后用Runge-Kutta法进行数值计算并对圆柱壳的非线性波动振动特性进行了分析。

Because of this, circular runout will not detect changes in size.

圆跳动是对被测圆柱的任一截面圆独立检测，圆跳动检测不到尺寸的变化，被测圆柱的任何桶形，腰形或锥形都将被忽略

The currents on the scatterer consist of three components, one is associated with the current induced by the incident field, the other two describe the reflected from the cylinder terminations.

圆柱上的电流由三部分构成，其中之一是入射波的感应电流，另外两部分是圆柱末端的反射电流。

The similarities of structure and loading conditions of a cylindrical shell with a hole under inside pressure and that of its plate model(a plate with a hole under tension) are analyzed to improve the precision of its fatigue life prediction by modeling.

研究受内压开孔圆柱壳与其受拉伸开孔平板模型在结构和受载条件上的相似性。有限元分析表明，开孔圆柱壳与其相应的平板模型在开孔附近的等效应力分布非常相似。

This paper analyses the relation of the tolerance , strength and rigidity of cyinder spiral spring and gives a method for calculating the tolerance of cylinder spiral spring.

在分析圆柱螺旋弹簧尺寸公差的可靠性条件和刚度的基础上提出了一个计算圆柱螺旋弹簧尺寸公差的方法。

The characteristics of cold precisions forging of floating cavity die which refers to spur gear was discussed in this paper.

分析直齿圆柱齿轮浮动凹模冷精锻工艺的特点，在该工艺基础上开发出了直齿圆柱齿轮的CAD/CAPP系统。

Generally,it is considered that cotton fibre is a column and its surface is smooth.The surface structure of Xinjiang long fine hair cotton is researched by using electronic microscope scanning (S-570 Japan).The result shows that the cotton fibre is not a column,but is spiral.The fibre of only 15%does not twist.The surface of the fibre is not smooth,and there are burrs on it.These characteristics would be another important factor effecting the stickability of cotton.

一般认为，棉纤维呈圆柱状，纤维表面是光滑的，笔者以新疆长绒棉为研究对象，用日立S-57日扫描电镜，研究了棉纤维的表面结构，结果表明，棉纤维并非呈圆柱状，自然状态下呈螺旋形，象氨基酸那样，根据概率估计，没有扭曲的约占15%，棉纤维表面并不光滑，有毛刺，这种结构特性是影响棉花粘着性的又一重要因素。

From the calculation results of an example, it is found that the total probability of failure of a structural system will not equal to the sum of the probabilities of failure for all the individual failure modes.

从其对耐压圆柱壳的计算结果可以看出，潜艇耐压圆柱壳结构的失效概率并不等于各失效模式的失效概率之和，这不同于Faulkner做出的求和理论假定。

This thesis analyzes the types and art trait of solar-assisted heat pump water heater, the development trend of direct expansion solar-assisted heat pump water heater, makes a summary of these research results from six aspects. On the basis of these works and from the point of view of receiving optimum solar radiation , the thesis develops a novel design model of direct expansion solar-assisted heat pump water heater with a truncated cone collector/evaporator, theoretically analyzes the heat that the system can absorb, compares its ability with other two types of cylinder and flat plate ones, and calculates COP and EER with computer aids. The results show that a truncated cone direct expansion solar-assisted heat pump water heater can absorb not only more solar energy but heat energy in air. It takes on favorable thermal performance. Under the average day in February which is of the worst weather throughout the year in Kunming, the COP is about 4. 2, EER is about 2.9 . The heat absorbed by the system are more than those of the other systems. The system is very great in terms of saving

本文分析研究了太阳能热泵热水系统的分类及技术特点，直膨式太阳能热泵技术国内外发展趋势，从六个方面对直膨式太阳能热泵热水系统的研究进行了归纳总结；在此基础之上，从太阳辐射的最佳接收考虑，提出了集热器／蒸发器为圆台侧面的圆台型直膨式太阳能热泵热水器的设计模型，理论上分析了这种热水系统所接收的太阳辐射和得热量，并与圆柱型、平板型的直膨式太阳能热泵热水系统进行对比分析，通过计算机辅助模拟计算出：系统不但可以有效地吸收太阳能，还能有效地吸收空气中的热量，具有良好的热性能；在昆明，以2月为代表的冬季，其太阳辐照较低，系统的制热系数COP值也能达到4.2，效能比EER值为2.9；系统的得热量高出圆柱型、平板型的直膨式太阳能热泵热水系统，节能效果明显。

Compared with the straight and helical gear, the contact and bending intensity of the symmetry arcate tooth trace cylindrical gear are high.

分析结果表明，对称弧形齿线圆柱齿轮的接触和弯曲强度均比直齿和斜齿圆柱齿轮好。

Objective To investigate the effects of interleukin-1 β converting enzyme gene on the biologic characteristics of ovarian cancer cells.

目的 探讨白细胞介素-1 β转换酶的表达，对卵巢癌细胞生物学特性的影响。

Campylobacter: This illness is the most commonly identified cause of diarrheal illness in the world.

弯曲：这种病是最常见的原因查明腹泻病，在世界上。