计算公式

By the introduction of the theory of sampling constant presented by Ingamells and Switzer, the stratified sampling for segregated bulk materials were studied.

将Ingamells-Switzer取样常数理论引入分层性固体物质的取样研究，提出了分层取样的最优化设计方案，推导出了各层取样量及分层取样方差极小值计算公式。

In the present paper, the Properties of the symmetric difference of the sets are systematically researched, the essence of the symmetric difference of the several sets is revealed in terms of disjoint resolution of the set, the formula of the measure calculation with respect to the symmetric difference of the several sets is given.

本文深入地对集合的对称差进行讨论，研究了它的性质，通过集合的不交分解揭示了若干个集合的对称差的本质，给出了关于集合的对称差的测度计算公式。徐州师范大学！徐州；221009；中国矿业大学北京校区！北京；100083

The combined bend moment calculation formula of dangerous section during chimney sympathetic vibration is listed.

简述钢制烟囱的横向振动机理，列出烟囱共振时在危险截面的组合弯矩计算公式，提出防止烟囱共振的几点建议。

Thirdly, theoretical stress analysis of the drum is made, and a finite element stress and model analysis of LW500×1200 basket is made too. The result shows that the drum intension satisfied the demand, and sympathetic vibration will not happen in normal rotate speed. Comparing the real situation, the decanter centrifuge of this type meets the safe demand.

再次，介绍了高速离心机转鼓的理论强度计算公式，并应用有限元分析软件ANSYS对LW500 1200离心机转鼓做了有限元强度分析和振动模态分析，结果表明离心机转鼓满足强度要求，而且在正常转速范围内不会发生共振现象，对照该型号离心机实际现场应用的情况，本文所研究的钻井液离心机确实能够满足工作安全要求。

This paper expounds the trend of armor development in the future, points out that the multistage series shaped charge is the development of the high explosive anti tank projectile, analyses the active process of three stage series shaped charge and the main factors to affect the flame proof time ,and brings forward zero dimentional equation and synthetic test method of the flame proof time .

该文阐述了未来装甲发展的趋势，指出了多级串联聚能装药是破甲弹的发展方向；分析了 3级串联聚能装药的作用过程和影响隔爆时间的主要因素，提出了隔爆时间的零维计算公式和综合测试方法。

The parameters are tangent vector error, the radius of curvature error and focusing error.

对光线追迹方法的研究，给出光路计算公式和基本流程图。

The taxable income referred to in Article 4 of the Tax Law shall be computed according to the following formulas

第十条 税法第四条所说的应纳税的所得额，其计算公式如下

The design for impedance converting circuit of input current,transistor amplifying circuit and converting circuit of output current is presented.The telegrapher equations are adopted to determine the impedance of transmission-line transformer,which is used to convert circuit impedance between signal source and transistor.

讨论了放大器输入回路阻抗变换电路、晶体管放大电路以及输出回路阻抗变换电路的设计思想，运用电报方程从理论上推导出用于信号源和晶体管之间阻抗变换的传输线变压器输入输出阻抗计算公式，由此设计出模拟信号处理电路中非常重要的AB类高功率放大器。

The prestress method is tried to be used to solve the problem of magnetic tensile force and lateral vibration on a turbo_generator rotor and the calculating formula is presented.

探讨了采用预应力法求解发电机转子磁拉力与弯曲振动问题的可行性，导出了有关的计算公式。

The effects of elasticity of metal bellows on performance ofmechanical seals have been studied in detail for the first time, which has not been doneuntil now. Furthermore the relations between leakage rate, friction factor, wear rate andelasticity of bellows have been developed. These results have been verified by the teston the rig.

首次通过对焊接金属波纹管机械密封性能的理论分析，详尽探讨了波纹管弹力对机械密封性能的影响，得到了密封端面泄漏量、摩擦磨损系数与波纹管弹力关系的计算公式，并在机械密封性能的试验台架上通过了实验验证。

Finally, according to market conditions and market products this article paper analyzes the trends in the development of camera technology, and designs a color night vision camera.

最后根据市场情况和市面上产品的情况分析了摄像机技术的发展趋势，并设计了一款彩色夜视摄像机。

Only person height weeds and the fierce looks stone idles were there.

只有半人深的荒草和龇牙咧嘴的神像。