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Over the last decade, as a result of modern computer technology and numerical control technology, the machining accuracy and machining efficiency is greatly enhanced, thus promoting the diversification of mechanical transmission products, machine matching of modular, standardized, and the art of design to make our products even more sophisticated and beautiful of.

近十几年来，由于近代计算机技术与数控技术的发展，使得机械加工精度，加工效率大大提高，从而推动了机械传动产品的多样化，整机配套的模块化，标准化，以及造型设计艺术化，使产品更加精致，美观化。

Considering of helical gear separate mesh and tooth-back shock, the non-linear vibration equitions of the system are also established, and the non-linear stable cycle solutions of the equitions are evaluated through dividing the timechanging stiffness matrics and dimension the equitions with selfadapt vary-step auto-RK4 numerical method.

考虑了斜齿轮传动的轮齿脱啮和齿后侧冲击，建立了系统的非线性振动方程，并通过对方程时变刚度阵的分块处理及无量刚化，用自适应变步长auto-RK4数值方法求出了系统非线性振动方程的稳态周期解。

This method has an obvious merit that we can avoid executing complicated numerical integration in the process of calculating interface matrixes.

这种方法的优点是获得界面矩阵时不需要复杂的数值积分。

Based on the theoretical model coupling Maxwells equation with the rate equation of 4 level inverted population, the numerical simulation is made via the FDTD method and MATLAB programs. The simulation results show that 1. With the increase of the pumping rate, both the localization of the electric field and the spectrum mode numbers will change; 2. The lasing threshold decreases by increasing the size or concentration of the scatters; 3. The lasing threshold also decreases by increasing the size of samples or strengthening the sample randomness.

在理论和实验研究的基础上，利用麦克斯韦方程与四能级反转粒子数的速率方程相耦合的理论模型，采用时域有限差分方法和MATLAB程序对随机激光泵浦阈值特性进行了数值模拟与计算，模拟结果显示：随着泵浦速率的增大，出现了阈值前后电场强度局域态及频谱模式数的改变；随着散射体粒径的增大，浓度的增大，阈值呈现下降的趋势；随着样品长度的增大，随机强度的增强，阈值也呈现下降的趋势。

A numerical model is developed based on the arch dam nonlinear dynamic analysis program ADAP-88 to simulate the strengthening performance of damper measurers installed in arch dams.

本文在已有的拱坝非线性动力分析程序ADAP-88中加入阻尼器模型，开发完成了可考虑阻尼器抗震加固措施的数值分析程序，并将该程序应用于大岗山拱坝的非线性动力反应分析中。

Mercury; Coal-fired boiler; Flue gas; Mercury species analysis; Flue gas cleaning devices; Aeration technology of seawater FGD; Numerical model; Drainage trend predication

汞； 燃煤锅炉；烟气；汞的形态分析；烟气净化设施；海水脱硫曝气工艺；数学模型；排放趋势预测

It is shown that the results based on this approach are in good agreement with the accurate numerical results. The propagation characteristics of metal-clad exponential index distribution waveguide are analyzed, too.

在外延生长过程中，采用微欠饱和母液回熔方法，提高了外延生长的重复性，解决了较大面积外延生长的表面质量问题，回熔厚度可控制在1μm左右，回熔表面平均平整度在30—200nm之间。

Thermal gas and liquid mass flow meter ; Flow rate measurement ; Accuracy ; Numerical simulation

西北工业大学动力与能源学院；热式气液质量流量计；流量测量；精度；数值模拟

The calculated results show that the established model is reasonable and the numerical simulation metho...

计算结果表明，所建模型正确合理，数值模拟计算方法满足要求。

The numerical calculation of grounding grid in large-scale substation under different conditions are carried out, including the breaking of grounding grid occurred in its edge part, in its mid-position as well as in different places simultaneously, thus the variation law of connective resistance of grounding grid under different conditions is obtained.

通过模拟计算，研究了变电站接地网导通电阻的变化规律，对不同情况下的接地网进行了模拟计算，包括边缘部分断开、中间部位断开以及多处部位断开，得出了不同情况下导通电阻的变化规律，结合变电站导通电阻的测试，将测试数据与计算数据进行比较，可判断接地网存在问题的位置。

Through comparing with the results by simulation to study the effects of theprojectile"s final velocity, the angle of rotation and the ballistic trajectory"s migration withdifferent projectile"s rotating speeds, different target"s moving speeds and differentpenetration angles.

通过比较数值模拟的结果来研究不同弹头转速、目标速度、侵彻角对侵彻过程中弹头最终速度、翻转角度和弹道偏移的影响。

I love stationery and all the accoutrement of writing.

我爱文具以及所有的书写的工具装备。