查询词典 method of approximation

A current based hybrid method combining the MOM with the Kirchhoff approximation for analysis of scattering interaction between a two-dimensional infinitely long conducting target with arbitrary cross section and a 1-D rough sea surface with PM spectrum is proposed.

利用基于电流计算的矩量法结合高频算法基尔霍夫近似的混合算法，分析了一维PM谱粗糙海面及其上方二维无限长任意截面导体目标的双站复合电磁散射特性。

In order to expand half space Green's functions with addition theorem, a high order approximation method is proposed for evaluation of reflection term of half-space Green's functions with far interactions.

采用高阶拟合方法将远区相互作用单元的半空间空域格林函数用级数表示，对高阶拟合项作加法定理展开，进而应用多层快速多极子算法。

The analytic studies of the MITA procedure based on dynamics and the function of thermo-diffuse and thermo-conduction combine these three physic field systematically. Compared with situation function with thermo-balance method, the analytic studies based on dynamics have less parameters approximation, and more precision. Meanwhile, the discipline of the microwave energy absorbed by tissue is should studied also.

基于动力学和热扩散、传导方程的微波热致超声波机制解析解的分析，将上述三类物理场有机地结合在了一起，与基于热平衡的状态解析分析相比，这一方法更少地对三物理场所涉及的参数进行近似，能更准确地反映微波热致超声波机制。

A method for the generation of Weierstrass fractal surface is presented,based on Helmholtz equation,with the Kirchhoff approximation,the calculus formula of light scattered field on the 1-D Weierstrass fractal suface is deduced.

采用Weierstrass分形函数模拟实际粗糙表面，从简谐光波满足的亥姆荷兹方程出发，利用基尔霍夫近似推导出一维Weierstrass分形粗糙表面的光散射场的积分公式，考虑遮蔽效应后数值计算并分析了表面散射光强的角分布特性。

Two kind of function approximator are involved, the state aggregation method and the linear construction approximation method.

因此本文的第二部分对平均报酬准则值函数近似问题进行了研究。

Firstly, the function sinx that appears in the simple pendulum equation is replaced with a polynomial of degree 3 using Maclaurin series expansion and Chebyshev polynomial approximation. Subsequently, the resulting equation which is a Duffing type equation is approximately solved with combing Newton's method and the harmonic balance method.

首先，利用Maclaurin展开和Chebyshev多项式加速技术将单摆振动方程中的正弦型恢复力用三次多项式近似代替，得到一个Duffing型方程；然后，将牛顿法与谐波平衡法结合起来建立Duffing方程的解析逼近周期及周期解，从而给出单摆振动的解析逼近解。

In this paper, based on the rational transfinite interpolation, a set of global approximation method namely rational macro-element method was proposed.

基于有理超限插值，提出了一种在求解域边界布点的全域求解数值方法－有理宏单元法。

In order to resolve the problem of the coordinates transformation between the WGS 84 and local geodetic system, in this paper, four parameter method with plane constraint and the method based on polynomial approximation are discussed.

GPS定位技术在各个领域中已得到了广泛的应用，而GPS定位成果属于WGS-84地心大地坐标系，致使将GPS地心坐标转换成本地坐标的方法愈来愈得到广大工程技术人员的关注。

Up-to-date, four models of the radiative transter processes have been developed: the two-stream Eddington approximation; the Eddington factor iteration; the ray tracing method and the Monte-Carlo method.

目前所见到的四种球对称系统中的尘埃辐射转移方法可被总结为：二流Eddington近似模型方法、Eddington因子迭代模型方法、射线跟踪法和Monte-Carlo模型方法。

The reults show that the recrossing and tunneling effects exist and the corrections by means of CVT method and small curvature approximation method are efficient respectively.

结果表明，反应存在返回效应和隧道效应，反应途径的曲率对隧道效应影响较大，用变分过渡态方法和小曲率近似方法分别进行校正是有效的。

Neither the killing of Mr Zarqawi nor any breakthrough on the political front will stop the insurgency and the fratricidal murders in their tracks.

在对危险的南部地区访问时，他斥责什叶派民兵领导人对中央集权的挑衅行为。

In fact,I've got him on the satellite mobile right now.

实际上 我们已接通卫星可视电话了