查询词典 mechanics

In mechanics kinematics, Jacobin matrix may be calculated and simplified by vector constructing; Inverse solution and its restricting condition be given; Forward solution be solved by new-raphson method. The method need shorter time than optimization and has a lot of advantages in applying program; some relationship of velocity, acceleration, force and error of mapping from input to output have been given. Analyzing of theory base these researches.

在机构运动学研究方面，通过矢量构造的方式计算出了速度雅克比矩阵，简化了计算量；给出了机构位置逆解的计算过程及约束条件；利用Newton—Raphson法计算出了机构位置的正解，该算法比优化法计算时间短，而且利于实际编程；给出了机构输入、输出端速度、力、误差的映射关系，这些研究是机构理论分析的基础。

The details are described as follows:Based on the principles of elasticity and plasticity mechanics theories, we finish an analysis of the stability near the 1150 horizontal jamb in theory and simulate the stress situation and the stability of the rock mass in the mining processes. Through the analysis on the numerical results and the types of the breakages in underground roadway we evaluate the stability and the security of this area and predict the possible breakages in the future.

具体内容包括：应用弹塑性力学的观点和方法，对二矿区1150中段水平矿柱附近区域的稳定性进行了理论分析，对矿区岩体在采矿过程中的受力状态和稳定性进行了计算机模拟，分析了工程布置区巷道破坏的原因和类型，并对水平矿柱矿体稳定性和采矿安全性进行了评估，对矿区将来可能发生的不利于生产的破坏形式进行了定性预测。

Based on the results from tests on the run up rhythm of college athletes in javelin throw, the paper showed that the major mistakes are poor stabilities and low utilization of speed in the run up ,by the means of biological mechanics.

本文以普通高校标枪运动员助跑节奏的测试结果，运用运动生物力学理论进行技术分析，认为助跑中的主要错误动作是稳定性差和速度利用率低。

By applying the theory of elastic multibody dynamics and structure mechanics, an elastic multibody model of suspension system has been set up, considering the effect of deformation of guiding bar and rubber joint.

轿车的前悬架是对受力变形十分敏感的总成，微小位移往，庄对汽车行驶性能产生较大的影响，因此在进行结构设计和分析时应考虑变形元件引起的效应。

First of all, the structural analysis under the action of random loads is carried out and the mean value and variance of all joint's displacement and bar's stress in the structure are obtained by means of three fundamental equations (equilibrium, physical and geometric) in structural mechanics, as well as the property of moment of random variable.

通过引入可靠性安全系数，并利用结构力学的三个基本方程，将结构的位移和杆件应力可靠性约束等价显示化为设计变量的线性函数，使原基于可靠性的优化模型转化为常规的序列线性规划问题，利用修正的单纯形法求解。

Key words: analytical mechanics; event space; variable mass; nonholonomic constraint; principle of Jourdain; Noether′s theorem

考虑N个质点组成的系统，其中每个质点的质量mi(i=1，…，N)是时间、位置、速度的函数， i为第i个质点mi的位矢。

The formula k of empirical electron theory of solid and molecules is derived by quantum mechanics with consideration of probabilities of orbital s, p, d , occupied by electrons, and a new formula k is given.

作者曾考虑了s， p，d轨道被价电子占据的几率，对固体与分子经验电子理论中的k公式重新进行了量子力学推导，给出了一个新的k公式。

One answer is probably the mechanics needed to keep a credit rating score healthy.

有一个答案可能是力学，需要保持信用评级评分的健康。

Temperature, Simple Thermodynamic System, Work, heat and First Law of Thermodynamics, Ideal Gases, Engines, Refrigerators, and The Second Law of Thermodynamics, Reversibility and the Kelvin Temperature Scale, Entropy, Pure Substances, Phase Transitions, Statistical Mechanics, thermal Properties of Solids, Higher-Order Phase Transitions: Critical Phenomena.

温度、简单热力学系、功、热及热力学第一定律、理想气体、热机、致冷机及热力学第二定律、可逆性与Kelvin 温标、Entropy、纯物质、相转变、统计力学、固体的热性质、高阶相转变：临界现象。

According to the theories of dynamics of explosive and rock fracture mechanics, initiation mechanism of kerf, and initiation of crack in its tip and its expansion of orientation fracture blasing with slit-charge in rock were studied, then the blasting, parameters were designed and tested by model test in laboratory.

以爆炸力学、岩石断裂力学理论为原理，对切缝药包在岩石定向断裂爆破中的切缝产生及裂纹起裂和扩展进行了一定的研究，同时对该法的爆破参数进行了设计，并在实验室进行模型试验验证其正确性。

It has been put forward that there exists single Ball point and double Ball points on the symmetrical connecting-rod curves of equilateral mechanisms.

从鲍尔点的形成原理出发，分析对称连杆曲线上鲍尔点的产生条件，提出等边机构的对称连杆曲线上有单鲍尔点和双鲍尔点。

The factory affiliated to the Group primarily manufactures multiple-purpose pincers, baking kits, knives, scissors, kitchenware, gardening tools and beauty care kits as well as other hardware tools, the annual production value of which reaches US$ 30 million dollars.

集团所属工厂主要生产多用钳、烤具、刀具、剪刀、厨具、花园工具、美容套等五金产品，年生产总值3000万美元，产品价廉物美、选料上乘、质量保证，深受国内外客户的青睐