力矩的

Rolling force and moment are the basic technics parameter for Assel rolling mill design,but about it,s technics calculate is very poor currently.one form by dint of approximately calculate, the result unlikelihood .J·kazanecki and domestic scholar according as metal distortion superior limit,gave some formula have some worthiness,but very complexity.the author base on practicality rolling technics, gvie a simpleness calculate means.the result close to measure numerical value,supply some reference value.

轧制力、轧制力矩是设计Assel轧管机最为基本的参数，但是目前关于其工艺计算的理论还很不成熟，只能借助于近似工程计算方法求得，结果往往偏差较大。德国的J·kazanecki和国内的一些学者提出了利用金属塑性变形场的上界法求解上述参数，具有一定的参考价值，但其数学计算相当繁杂。作者从轧制工艺实际出发，遵循塑性力学的基本原理，给出了简便易行的计算方法，具有重要的实际意义。

Holding the bow is like a teeterboard supported by thumb as the pivot and the cooperated forcing of forefinger and little finger produces a moment M. The "P-x-M Line Method" shows when playing a down bow, M increases with x and gradually changes its direction and this process is determined by P, the gravity and barycenter of bow. The "P-x-F Plane Method" shows that the most force-saving bowing path should locate in the lower part of this plane. The analyses of "Helmholtz Motion" and "Schelleng Diagram" indicate P and its range is in direct ratio with volume, velocity of bow, the approaching degree of the bow to the bridge and has some relationship with the quality of string and bow.

国内近期出现了用物理模型来研究小提琴运弓问题的尝试本文第一部分首先指出握弓类似于一个以***(F3)为支点的跷跷板，主要以食指(F1)和小指(F2)的施力配合，产生握弓力矩M；随后用"P-x-M直线法"证实：演奏下弓是M随的***而逐渐增大并转换方向的***，此***取决于P、弓的重力和重心；并首创"P-x-F平面法"，在x，F1，F2空间中证实：省力的运弓路径应在该平面中处于较低的位置第二部分通过分析"赫尔姆霍茨运动"和"Schelleng图表"指出：P及其变化范围和音量、弓速、弓与琴码的接近程度成正比，并与琴弦和弓自身的性质有关

The distribution of gear's contact stress, root stress, and contact engagement line in the engagement situation of gear pairs, were obtained on the base of explicit integration method. 3. Adopting the method of system matrix, the torsional vibration differential equation of general shafting was gained. The simple harmonic forms of excitation torque under the normal combustion or piston flameout of in-line engine and v-type engine were analysed. The decoupled algorithm of free vibration and forced vibration and the solution to the vibration damper's energy of resistance and the off-resonance calculation were studied. The sensitivity formulations of the natural frequency and vibration mode to physical parameters of system were derived by solving the eigenvalue problem. These sensitivity formulations provided the theoretical base for the dynamic modification of structure.

运用系统矩阵法建立了轴系的扭振微分方程，并对直列和V型发动机在正常发火和气缸熄火工况下的激振力矩进行了详细的简谐分析；基于精确方法推导了自由振动和强迫振动的解耦算法，给出了能量法计算中的减振器阻尼功求解和非共振计算方法；并研究了曲轴系扭振非线性分析中的变惯量问题，得到了单缸转动惯量的精确求解公式以及变惯量和固有频率的关系式；最后，从特征方程和振型正交性出发，推导了固有频率和振型对轴系转动惯量和刚度等物理参数的灵敏度，为扭振系统的结构动力学修改提供了理论基础。

First of all, vertical load function test of function, we workingbench designed to need to carry on vertical loaded analysis to guide mainly, can be drawn lessons from method of the analysis of performance of vertical load,etc.

首先，垂直载荷作用下的性能测试，我们需要设计的工作台主要就是对导轨进行垂直载荷的分析，针对垂直载荷性能分析的方法等都可以在具体的加载方案中可以借鉴，再次是对侧面载荷作用下的性能测试的分析，最后对力矩作用时性能测试的结果也作了详尽的分析，其作用在加载方案的选择上面有一定的意义。

In this article, three kinds of prealloy powder were developed by water atomization method. The base attribute, pattern, phase composition, differential thermal analysis of powder were researched. Sintered density, hardness, bend strength, Young's modulus were researched as hot pressed sintering temperature changing. By using abrasive wearing equipment upbuilt by the authors, the wear resistance were determined. Green-pressing density, simulated green-pressing strength and bonding momental of high frequency brazing were assayed. SEM corrosion structure and SEM appearance of fracture were observed.

本文采用水雾化法开发了三种预合金代钴粉末：对粉末的基本属性、形貌，粉末的相组成，粉末的差热性进行了分析研究；测定了它们的烧结密度、硬度、抗弯强度、弹性模量随热压烧结温度变化的规律；采用作者自行建立的磨料磨损试验方法，测定了它们的质量磨损百分率；测定了它们的冷压生坯密度、模拟生坯强度以及高频钎焊的结合力矩；观察了热压烧结SEM腐蚀组织和SEM断口形貌。

At first, this paper gives the brief introduction of the history and present status of accelerometer and its testing technology, the working principium and math model of the liquid floated pendu-lous accelerometer, and then, decides the binary width pulse force retrim loop as the design proposal of testing system, researches the transfer function of every part in the system emphasizly, analyses the stability of the whole accelerometer testing system from the angle of control theoretics by the open loop transfer function of system, and designed the correcting net, analyses the basal problems such as resolution, sampling restraint, precision and so on, designs the hardware testing circuits such as preamplification, band-pass filter, alternating amplifier, phase sensitive demodulatorn, pulse-width modulation, frequency scale circuit, moment current generator. Finally, using the graphics program language LabV-IEW which is designed for testing field especially by NI accomplishes the solfware design of testing system,realized the testing functions.

首先对加速度计及其测试技术的发展历史和现状，液浮摆式加速度计的工作原理和数学模型等作了简要的介绍，然后确定了以二元调宽脉冲再平衡测试回路为设计方案，并从控制理论的角度进行了分析，着重研究了系统中各部分的传递函数，利用系统开环传递函数分析了系统的稳定性，同时设计了系统的校正网络；分析了二元调宽脉冲再平衡测试回路的分辨率、采样约束以及测试精度等基本问题，并按照系统分析的结果设计了包括前置放大、带通滤波、交流放大、相敏解调、脉宽调制、频标电路以及力矩电流发生器等测试系统各部分硬件电路，验证了电路的正确性，最后按照测试系统的要求，采用了美国NI公司专为测试领域所开发的虚拟仪器工具——LabVIEW作为测试软件开发工具，利用该图形化编程语言完成了测试系统软件部分的设计，实现了测试功能。

Considering the influence of fluid's viscosity and large amplitude sloshing, the 2-dimension coupling system composed of uncompressible viscous fluid and ideal elastic structure of rectangle aqueduct is studied by using ADINA to develop the models in this paper. Analyze the dynamic response of the rectangle aqueduct structure by large amplitude liquid sloshing. Under the horizontal harmonic excitations with different amplitudes, analyze the harmonic response of the rectangle aqueduct structure and fluid, include pressure on the tank wall ,free surface height and so on.

本文应用大型通用有限元软件ADINA探讨了计入流体的粘性、大幅晃动影响，不可压缩粘性流体与矩形渡槽弹性体的二维动力耦合问题，分析流体的大幅晃动对矩形渡槽结构所带来的动力影响问题；在水平谐波激励方式下，针对不同的激励振幅和激励频率，研究渡槽结构和水体的振动反应包括渡槽结构的倾覆力和倾覆力矩，水体自由液面角点的波高和水体底部角点的动水压力的反应分析。

Analyzing the calculating process of belt conveyor with high angle theoretically, starting from its theoretic calculate the cross sectional area of materials and peripheral force, shaft power of drum, power of motor, using point by point method to get the resultant strain of every drum and torsion of driving drum, calculating the maximum strain and the maximum reverse stopping torque, to give the support on theory for using belt conveyor with super-long distance, high angle under the coal mine.

本文针对长运距、大倾角、高强度带式输送机设计过程中存在的问题，从四个方面对大倾角带式输送机进行分析研究：从理论上解析大倾角带式输送机的计算过程，从大倾角带式输送机的理论入手，详细计算物料的横截面面积、圆周力、滚筒轴功率和电机功率，利用逐点计算法计算各个滚筒的合张力以及传动滚筒的扭距，计算出胶带的最大张力和最大逆止力矩，给长运距、大倾角皮带机在煤矿井下的使用给予理论上的支持。

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。

Neither the killing of Mr Zarqawi nor any breakthrough on the political front will stop the insurgency and the fratricidal murders in their tracks.

在对危险的南部地区访问时，他斥责什叶派民兵领导人对中央集权的挑衅行为。

In fact,I've got him on the satellite mobile right now.

实际上 我们已接通卫星可视电话了