有变化力的

Therefore, the torque required to open the gate valve required torque than the closure of large, in addition, for a pair of contact between the sealing surface, the Non Rising Stem Resilient Seated Gate Valves coefficient of static friction between them than the dynamic friction coefficient, to make them from the static state generate the relative movement is required to exert greater force to overcome the static friction; due to temperature changes, so that the sealing surface pressure between the larger, need to overcome the static friction force also will be bigger, so that when you open the valve on the stem nut on the sometimes increase the torque exerted a lot.

所以，开启闸阀所需的力矩比关闭闸阀所需的力矩大，此外，对于一对互相接触的密封面来说，它们之间的静摩擦系数也比动摩擦系数大，要使它们从静止状态产生相对运动，需施加较大的力以克服静摩擦力；由于温度变化，使密封面间的压力变大，需要克服的静摩擦力也随之变大，从而使开启闸阀时，对阀杆螺母上施加的力矩有时会增大很多。" Moment analysis of valve operation "是由中国闸阀网提供的国际阀门新闻，译文仅供参考。另外，中国闸阀网还提供相关产品搜索：闸阀型号、闸阀价格、闸阀技术、闸阀新闻、闸阀生产商等。

This paper mainly studies the technique of the width control of E2 edger mill which belongs to Panzhihua Iron and Steel Industry. It introduces the development of the technique. In addition, this paper describes the Automatic Width Control technique in detail, including the composing and the control principle of the AWC hydraulic system.

本文主要研究了攀钢E2轧机的自动宽度控制液压系统，介绍了宽度控制的发展概况，并详细论述了E2轧机宽度自动控制系统的组成及原理——针对轧制力变化引起立辊轧机有载辊缝波动而相应调节侧压位移量以补偿辊缝波动。

Since the structure and the shape of the crankshaft are complicated and the loads vary periodically,it is difficult to calculate its strength and rigidness using classical mechanics.

因为曲轴的结构形状比较复杂，各个曲拐的受力又在发生周期性的变化，所以运用经典力学对其进行强度和刚度计算有一定的困难。

Treated with 3 kinds of cultivation medium s:peat,moss and soil,adaptability of Thalia dealbata,Pontederia cordata,Iris sanguinea and Hydrocotyle verticillata were compared.

结果表明：3种处理下，再力花、海寿花和轮叶石胡荽的植株地上部、地下部生物量均以地栽处理最高，植株根冠比均以地栽处理最低；溪荪在3种处理下的适应性没有表现出明显差异；4种植物在3个处理下的根系活跃吸收面积率变化趋势相似，基本在40%～50%波动，没有明显差异；4种植物在泥炭栽培和水苔藓栽培基质下都有一定的适应性。

Therefore, under the precondition of ensuring operating performance, it has the vital significance to enhance transmission efficiency of the torque converter.

因此，研究油温的变化对传动效率产生的影响，提高液力变矩器的传动效率有重要的实际意义。

Works on the bending roll system of four-roll rolling mill, the workroll shape variation caused by the force of bending roll and the contact stress between rolls was researched with the FEM software ANSYS, the maximum deformation of the work roll was calculated, and the curve of the gap adopting the Least-Squares method was fitted, which set the base of the further calculation of load-gap shape.

以四辊轧机的弯辊系统为研究对象，利用有限元分析软件ANSYS研究弯辊力和辊间接触应力引起工作辊形状的变化，计算工作辊弯曲的最大变形量，并用最小二乘法对辊缝曲线进行拟合，为进一步计算有载辊缝形状提供可靠的理论依据。

The mechanical behaviour of the bridge with and without middle diaphragm s in the loading-failure process is investigated in great detail.

以虚拟层合单元程序为基础，综合考虑结构的几何非线性和材料非线性，对一典型5跨简支连续小箱梁桥结构的极限承载力进行了分析，重点考察了在有、无跨中横隔梁时，结构从加载到破坏的全过程中受力性能的变化。

It was believedthat analysis of the proviral intermediate DNA andthe antigenicity of its structural proteins wouldsuply valuable data and method for the further re-search to EIAV on the molecular level in the future.

本文对马传贫分子特性的探索性研究为今后进一步深入研究马传贫病毒的毒力变化和免疫的分子机制提供了有价值的参考数据和分析方法。

This paper developed a vibratory tapping chuck base on vibratory cutting principle.The characteristic of the vibratory cutting force using the chuck is investigated by large number of experiments.

文摘：本文根据振动攻丝基本原理，研制出具有振动攻丝功能的振动攻丝卡头，并利用该卡头对振动攻丝切削力变化特点进行了大量的实验研究。

Which part of a stop for Miduoban, density not less than 0.80g/cm3 otherwise affect loading capacity and formation; Wet rate not less than 6.5%, but not too high, can not self-regulate on the basis of climate change; Surface craft, touching them with their hands or face is one-dimensional relief, relief to face the best; formaldehyde emissions 1.1mg/L reach Europe E1 class standards, and a test report on shaving board, staining the curing plates.

其中间基材部分为中密度板，密度不能低于0.80g/cm3，否则影响承重力和平整性；含水率不能低于6.5%，但也不能过高，否则无法根据气候的变化自行调节；表面工艺，用手触摸辨别是浮雕面还是平面的，浮雕面的为最好；甲醛释放量1.1mg/L，达到欧洲E1级标准，且有检测报告，警惕刨花板、染色的防潮板。

On the other hand, the more important thing is because the urban housing is a kind of heterogeneity products.

另一方面，更重要的是由于城市住房是一种异质性产品。

Climate histogram is the fall that collects place measure calm value, cent serves as cross axle for a few equal interval, the area that the frequency that the value appears according to place is accumulated and becomes will be determined inside each interval, discharge the graph that rise with post, also be called histogram.

气候直方图是将所收集的降水量测定值，分为几个相等的区间作为横轴，并将各区间内所测定值依所出现的次数累积而成的面积，用柱子排起来的图形，也叫做柱状图。