平衡法

The bending of rectangular plate is divided into the generalized statically determinate bending and the generalized statically indeterminate bending based on the analysis of the completeness of calculating condition at the corner point. The former can be solved directly by the equilibrium differential equation and the boundary conditions of four edges of the plate.

在分析角点求解条件完备性的基础上将矩形板弯曲划分为广义静定问题和广义超静定问题，广义静定弯曲可以由板的平衡微分方程及四边边界条件直接求解，广义超静定弯曲可以由叠加法求解。

The cooling process involves complex droplet evaporation, strong convective heat and mass transfer, therefore a deep understanding of spray characteristics is essential to optimize the nozzle design and improve the cooling efficiency of the spray. This paper presents a theoretical model to describe the equilibrium evaporation process of a single droplet in cryogen spray.

为了深入了解制冷剂喷雾特性以提高冷却效率、优化喷嘴设计，利用质量传递数法推导传质方程，通过选取合适的阻力系数经验关联式建立了动量方程，考虑液滴蒸发以及与环境气体的对流换热建立了液滴能量方程，初步建立了单个制冷剂液滴平衡蒸发阶段蒸发冷却理论模型。

Based on wave function expansion method, the potential functions of scattered waves are expanded into Fourier-Bessel series; and a set of cylindrical coordinate systems is utilized in such a way that it allows to solve the problem of multiple scattering; the solution is determined by imposing continuity and equilibrium conditions at the soil-pile interfaces.

采用波函数展开法，将散射波的势函数展开成Fourier-Bessel级数的形式，利用一组可以求解多散射问题的圆柱坐标系统和桩土界面处位移连续的条件，以及刚性桩的动力平衡条件，得到问题的理论解。

Based on a second order damped oscillation differential equation for a missile and upon a detailed analysis of the balance sideslip angle under commands from several different ways of control, the paper proposes some significant empirical criteria for the static stability design of anti tank missiles.

根据弹体摆动运动的简化数学模型，通过对几种控制方式不同的反坦克导弹在指令作用下的平衡侧滑角等数据进行分析研究，得出了反坦克导弹静稳定度设计的一个经验性法

The models of decalescence and heat-lossing are established.

为了得到锻模的热平衡状态，提出试探法的新思路求解最佳工作节拍。

UNIFAC method was applied to the mathematical simulation of methanol distillation to calculate the equilibrium data of five component systems which include methanol, water, decane, isobutanol and ethanol.

将UNIFAC法应用于甲醇精馏过程数学模拟，计算甲醇-水-癸烷-异丁醇-乙醇五组分体系的汽液平衡数据，从理论上成功地解释了在甲醇精馏过程中加水萃取精馏的原理。

Through drawing an equilibrium diagram with diagonal branch using independent path method, the instability of airflow in diagonal branch can be seen clearly.

应用独立通路法画出含有角联分支的通风网络平衡图，可以直观地看出角联分支风流不稳定的变化情况，从而为研究角联分支对通风网络的影响提供更有效的方法。

This makes more and more people pay more attention to studies and applications of numerical simulation in thermal recovery. In this research, we have developed a reliable mathematical model for thermal recovery, which takes a full consideration of the effect of viscos, gravitical and capillary forces on the three-phase flow of gas, water and oil, the effect of the temperature on the medium characteristics of liquid and solid, the phase equilibrium of gas-liquid in each component, heat transportation including connection, conduction and radiation as well as heat losses in both the overburn and underlying strata. In the space discreation of the mathematical model, we have proposed a new method based on the improvement of the conventional nine-points difference approximation, which has a higher difference accurancy.

本项研究以热力采油的主要机理为基础，充分考虑在粘性力、重力和毛管力作用下油水气三相流动，考虑温度对各种流体和固体介质物性的影响，考虑每一组分中汽液两相的相平衡，考虑热在地层中的传导、对流和辐射以及上下盖层的热损失，利用热力学第一定律、质量守恒定律和流体迁移定律，建立了正确可靠的注蒸汽数学模型；在对数学模型进行空间离散时，利用控制有限体积积分法，对以往的九点差分近似作了合理的改进，使其具有较高的差分近似精度：结果表明，该公式的近似精度要比以往文献中所给的九点差分近似精度高，可以认为，在油藏数值模拟中，如果遇到非均质情况，使用这种九点差分近似更合理。

A finite element incremental weighted iteration method, which can avoid divergency and speed up the convergence process,was proposed to solve the problems of tubing buckling in deviated wells.

建立了直井中有重钻柱非线性屈曲平衡方程及相应的泛函表达式，构造了一种能避免发散并加速收敛的有限元增量加权迭代法求解斜直井中钻柱屈曲问题，首次采用直接求解非线性特征值的方法来分析钻柱屈曲问题。

U.S. Witton valve The main products are: electric valve, pneumatic valve, high temperature and pressure valve, ball valve, gate valve, butterfly valve, globe valve, check valve, control valve, solenoid valve, safety valve, needle valves, steam traps, plug valves, diaphragm valve, duckbill valve, discharge valve, exhaust valve, breathing valves, filters, flame arrester, the throttle valve, angle seat valve, balance valve, discharge valve, sludge valve, isolating valve, valve, pipe clip valve, plunger valve, foot valve, depending on the lens, flange, hydraulic control valves, and other products.

美国威顿阀门主要产品有：电动阀门、气动阀门、高温高压阀门、球阀、闸阀、蝶阀、截止阀、止回阀、调节阀、电磁阀、安全阀、针型阀、疏水阀、旋塞阀、隔膜阀、鸭嘴阀、放料阀、排气阀、呼吸阀、过滤器、阻火器、节流阀、角座阀、平衡阀、排污阀、排泥阀、切断阀、减压阀、管夹阀、柱塞阀、底阀、视镜、法兰、水力控制阀等系列产品。

According to the clear water experiment, aeration performance of the new equipment is good with high total oxygen transfer coefficient and oxygen utilization ratio.

曝气设备的动力效率在叶轮转速为120rpm～150rpm时取得最大值，此时氧利用率和充氧能力也具有较高值。

The environmental stability of that world - including its crushing pressures and icy darkness - means that some of its most famous inhabitants have survived for eons as evolutionary throwbacks, their bodies undergoing little change.

稳定的海底环境─包括能把人压扁的压力和冰冷的黑暗─意谓海底某些最知名的栖居生物已以演化返祖的样态活了万世，形体几无变化。