力矩

AbstractObjectives1 Correlate bone mineral densityto vertebral compressive strengths.2 Consummate the technique for percutaneous polymethylmethacrylate vertebroplasty and observe the pattern of PMMA imaging distribution.3 Determine the strength and stiffness of osteoporotic with or without vertebroplasty with PMMA bone cement.4 Correlation of BMD,insertion torque and pull-out strengths of pedicle screws.5 Ascertain whether augmentation with PMMA bone cement can enhance pedicle screw fixation in the osteoporotic spine.6 Ascertain whether augmentation pedicle screw fixation with PMMA bone cement can enhance the stability of unstable thoracolurner burst fractures of osteoporotic spine.

目 的1、测试椎体压缩强度，分析强度与骨矿物质密度（bone mineral density，BMD）的相关关系。2、观察经皮椎体成形术后聚甲基丙烯酸甲脂（polymethylme- thacrylate，PMMA）骨水泥在椎体内的形态学分布及影像学表现。3、比较PMMA骨水泥骨质疏松椎体成形术前/后椎体最大抗压力和压缩刚度的变化。4、分析椎体BMD、螺钉最大旅入力矩和最大拔出力三者之间的关系。5、分析PMMA骨水泥强化骨质疏松椎弓根螺钉后的螺钉的最大轴向拔出力和拔出刚度的变化。6、评价PMMA骨水泥强化骨质疏松椎弓根螺钉脊柱内固定对不稳定型胸腰椎损伤的即刻稳定性和反复载荷后的稳定性。

When used fir fastening,all screws are provided with means for applying a torqueto them;this may consist of a square of hexagonal head for a wrench,a head with a slot or a cross-shaped recess for a screwdriver,a cylindrical head with a recess fitting a special wrench,or a slot or recess on one end fitting a screwdriver or special wrench and no head.

当二手的枞树系结物，所有的螺丝钉用应用一个转力矩到他们的方法来提供；这可能为一个扳钳有一个六角形头的正方形，一个头用一个位置或者一个跨为一个螺丝起子作形了休息，一个圆筒形的头用一个休息适宜的一个特别的扳钳、或在一端上的一个位置或休息适宜的一个螺丝起子或特别的扳钳和没有头。

A heterodyne radio device in which one tube serves simultaneously as oscillator and detector .

接到探测器的导线和一些轴承摩擦力会产生杂散力矩。

Electric screwdriver,Insulation Impulse Tester,Torque Analyzer,Tweezer,Wire cutter,Manual screwdriver,Magnifier,Bit.

电动螺丝刀，绝缘电池测试仪，力矩测试仪，精密镊子，剪钳，手动螺丝刀，专业放大镜，配套批头。

The design and the realization of missile wing and rudder load simulation system based on digital signal processor and direct torque control servo driver are discussed.The structure,strategy of control and operation principle of the system are presented.The reason of the superabundant torque and the method which can eliminating the superabundant torque are analysed.

研究以数字信号处理器和以直接转矩控制输出的伺服驱动器为核心的导弹弹翼尾翼加载控制系统的系统结构、控制策略、工作原理及实现方法，详细分析加载系统中多余力矩的产生及抑制方法，解决电动加载系统关键性的两个难点，即快速性和多余力消除。

In this paper,the design of a feedback compensation control system for reaction wheel of torque mode is introduced.

介绍了反作用飞轮力矩模式反馈补偿控制系统的设计。

In a dynamic simulation system for motor vehicle,the fidelity of simulated steering wheel reaction torque has influence on the operating behaviour of experimented drivers,so that has also influence on the accuracy of simulation of drivers' operation.

在汽车动态模拟系统中，转向盘反力矩的仿真逼真度影响实验驾驶员的操纵行为，从而影响驾驶模拟实验的准确性。

In the process of overturning stability analysis of counterforted buttressed quay wall with crane rail bearer,we shall consider the stabilization moment caused by the force of cutting pile.

设置桩支承的起重机轨道梁的扶壁码头结构形式，抗倾稳定性影响分析中应该考虑截桩力的稳定力矩。

Angle type valve to cut off travel greater pressure is due to media in the spool or the valve plate force generated by the rotational axis of the torque produced is very small, so it can withstand a greater pressure differential.

角行程类阀的切断压差较大，是因为介质在阀芯或阀板上产生的合力对转动轴产生的力矩非常小，因此，它能承受较大的压差。

Angle type valve to cut off travel greater pressure because of media in the spool or the valve plate force generated by the rotational axis of the torque produced is very small, Check Valves so it can withstand a greater pressure differential.

角行程类阀的切断压差较大，是因为介质在阀芯或阀板上产生的合力对转动轴产生的力矩非常小，因此，它能承受较大的压差。

I can not make it blossom and suits me

我不能让树为我开花

When temperatures are above approximately 80 °C discolouration of the raceways or rolling elements is a frequent feature.

当温度高于 80 °C 左右时，滚道或滚动元件褪色是很常见的特征。