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The linear theory of antisymmetric ducted gravity waves supported by mesospheric thermal duct is presented, propagation and evolution of gravity wave packets in thermal duct is also simulated by using a nonlinear two-dimensional model. Numerical results show that lower atmospheric wave disturbance can penetrate into the duct area and be trapped.

给出了重力波在中层大气温度波导中的反对称形式导制传播的线性理论模型，并采用二维非线性的数值模型对重力波波包在中层大气温度波导中的传播和演变过程进行了模拟研究。

By the process of numerical control machining ,carrier antrum of high quality is made out,and the efficiency is improved.

介绍了采用高速数控雕铣机床加工一种尺寸极小、精度要求较高的有色金属零件，利用数控加工的一般流程，体现了高速数控加工的突出特点，加工出高品质的微波芯片零件，大大提高了其加工效率。

With the help of numerical simulation, the surface settlement, the apophysis on the bottom of foundation and the level displacement were calculated and analyzed by using FEM program.

根据计算结果和实际情况的比较反证了在软粘土中应用该模型是适合的，同时，对基坑开挖施工、地表沉降预计等作了定性的分析。

A self-preservation law of surface apophysis is found and a universal empirical formula is established. Finally, the jet and bubbly jet in flowing ambient are studyed by model and numerical test.

对流动环境中射流、掺气射流亦进行了类似于静止环境中的研究，不同的是给出了流动的转变条件和流速比对流动结构的影响。

Referring to related newly developed methods abroad,in the paper, the expressions of frequency domain apparent resistivity and its numerical calculating formulae of electromagnetic field of vertical magnetic dipole source for the surface of horizontally layered media have been obtained.

该文参考国外最新发展的方法，求取了水平层状介质表面上垂直磁偶极源电磁场的频域视电阻率表达式及其数值计算公式，并用自编程序计算了几种典型地电断面的视电阻率曲线，以说明这种方法的有效

Two kinds of numerical analysis model are put forward, and its applicability is discussed.

建立了两种便于实际操作的阻尼器在结构振动分析中的计算模型，并分别对两种数学模型的适用性进行了评价。

A simplified approximate calculation method is present in this paper for the central principal axis stiffness of numerical control processing.

这篇文章介绍了一种简化的近似计算数控加工中心主轴组件的方法。

Through numerical calculation and comparison with the complete formula,the accuracy of the approximate formula for calculation of reflection coefficient often used in AVA method for gas hydrate is discussed.

通过与完整公式的对比，对AVA常用的反射系数近似计算式的精度进行了讨论，同时分析了地震波速度、泊松比、密度等参数对于BSR反射系数的不同贡献。

Combining the definition of CWT and the derivative property of convolution, we constructed a general method to calculate the approximate derivative of signal through CWT by using the first and second derivative of Gaussian function, Haar, and the first derivative of three-order-Spline function as wavelets. As compared with the other approaches of calculating derivative, which include the numerical differentiation, polynomial filters, Fourier transform, and the recently proposed DWT method, fast calculation and simple mathematical operation were remarkable advantages of CWT method. For the signal corrupted by severe noise (Signal-toNoise Ratio=5), the satisfactory results could also obtained via CWT method through appropriately adiusting the dilations.

在此基础上，(1)结合连续小波变换的特点和卷积的微分性质，提出了使用Gaussian函数的一阶和二阶导数，Haar和三次样条函数的一阶导数作为小波函数的连续小波变换计算信号近似导数的一般性方法，与其他导数计算方法(包括数字微分法，多项式滤波法，Fourier变换法和离散小波变换法)相比，本法简单便捷，计算速度快，对于噪声含量较高的信号(S/N为5)，只要适当调节尺度即可获得比较满意的结果。

And the numerical solutions of difference equation are regarded as the approximate solutions for the differential equation.

文中首先对对称正则长波方程提出了一个两层和两个三层的有限差分格式。

We have no common name for a mime of Sophron or Xenarchus and a Socratic Conversation; and we should still be without one even if the imitation in the two instances were in trimeters or elegiacs or some other kind of verse--though it is the way with people to tack on 'poet' to the name of a metre, and talk of elegiac-poets and epic-poets, thinking that they call them poets not by reason of the imitative nature of their work, but indiscriminately by reason of the metre they write in.

索夫农 、森那库斯和苏格拉底式的对话采用的模仿没有一个公共的名称；三音步诗、挽歌体或其他类型的诗的模仿也没有——人们把&诗人&这一名词和格律名称结合到一起，称之为挽歌体诗人或者史诗诗人，他们被称为诗人，似乎只是因为遵守格律写作，而非他们作品的模仿本质。

The relationship between communicative competence and grammar teaching should be that of the ends and the means.

交际能力和语法的关系应该是目标与途径的关系。