静力学

From the perspective of the variational discussion of Lagrange\'s contributions to the principles and analyzation of mechanics,the interaction between the calculus of variations and mechanics,especially the variational principles is made clear.

结合拉格朗日微积分代数化方案和18世纪可积性条件的研究，探讨了拉格朗日关于变分法基础研究的数学背景及相关工作；通过对《分析力学》中静力学约束平衡问题的细致考察，系统探讨了变分法中乘子法则的力学渊源、提出过程及意义。

Archimedes in the mechanical aspects of the most outstanding achievements, these achievements mainly concentrated in the statics and hydrostatics regard.

阿基米德在力学方面的成绩最为突出，这些成就主要集中在静力学和流体静力学方面。

We carried out two kinds of finite element biomechanical analysis in each model: 1, static structural analysis; 2, displacement load analysis.

每个模型进行两方面的有限元生物力学分析：1、静力学结构分析；2、位移荷载形变条件下力学分析。

W. Meyer from the perspective of the static mechanical stratification of potential energy theory, a theoretical study of the hierarchical system and static mechanical dynamics of the two factions.

迈耶则从静力学角度提出了分层的位能学说，形成了分层理论研究的动力学体系和静力学体系两个派别。

Virtual displacement principle of the analysis statics was used to establish static-equilibrium equations, which was used in calculating driving forces and torques when the mechanism was at some static-equilibrium state.

采用分析静力学的虚位移原理建立静力平衡方程，并用该方程计算了机构处于某种静力平衡状态下的平衡驱动力及力矩。

Based on the theoretical model of the optical and near-infrared wavelength refractivity which is recommended by the International Union of Geodesy and Geophysics's resolution in 1999, as well as, theory of Mendes(2004), we rededuce some theoretical formulae and give the practical expressions of hydrostatic and non-hydrostatic components of the refractivity.

本文基于国际大地测量与地球物理联合会1999决议推荐的光学和近红外波段的大气折射率差理论模型，在Mendes（2004）理论的基础上，对某些理论公式进行了重新推导，给出了大气折射率差静力学和非静力学分量的实用表达式。

Statics 静力学 A workpiece lies on a drill press, four equidimensional holes are drilled in the work piece, the force couple of every drill is .

Statics 静力学平面力偶系平衡的充要条件是：所有各力偶矩的代数和等于零。

These tubes are hydrostatically tested by the manufacturer but, unlike cylinders and mobile tubes, periodical hydrostatic testing is not required.

这些管道经过了制造商的流体静力学测试，但是和钢瓶和移动管道不一样，它们不要求定时的流体静力学测试。

Based on the differential geometry, mechanical system dynamics, theoretical mechanics, strength of materials and elasticity theory, we made the study for the enwinding system in the roller of the ZJ70D rig. Finally, we solved the equations in the computers.

本文依据微分几何、机械系统动力学、理论力学、材料力学及弹性力学等基础理论，对钢丝绳在LEBUS绳槽滚筒缠绕行为进行了几何、动力学及静力学等方面的研究，并基于ZJ70D钻机结构参数进行求解。

The concept of air floating decrease coefficient was introduced and thecomputing method about correlative parameters and stability indications of staticstability were studied considering the geometry parameters, air pressure and differentdrafts. Based on the theoretical methods of the statics of the ship, computing methodon static stability of steel cylinder block is given, the stability properties of thestructure block made up of four steel cylinders whose diameter is 10.5m werecalculated under six kinds of drafts and different aeration heights, the initialmetacenetric height of the structure block was obtained, and the stability wasevaluated under different floating conditions.

本文考虑气浮钢筒组块的几何参数、充气压力，及不同的吃水，引入气浮力折减系数的概念，研究与静稳性有关的参数和稳性指标的计算方法，基于船舶静力学的理论方法，提出了钢筒组块静稳性的计算方法，计算了四个直径10.5m的钢筒组成的结构模块在6种不同吃水及不同充气高度下的稳性指标，得到了模块的初稳性高，评估了不同浮态下的稳性。

Breath, muscle contraction of the buttocks; arch body, as far as possible to hold his head, right leg straight towards the ceiling (peg-leg knee in order to avoid muscle tension).

呼气，收缩臀部肌肉；拱起身体，尽量抬起头来，右腿伸直朝向天花板（膝微屈，以避免肌肉紧张）。

The cost of moving grain food products was unchanged from May, but year over year are up 8%.

粮食产品的运输费用与5月份相比没有变化，但却比去年同期高8％。