近似方法

A modified Vlasov equation which describes the evolution of the spatial and momentum distribution of axisymmetrical electron beams is developed based on the statistical dynamics theory.

利用统计动力学方法建立了描述旋转对称电子束的电子空间及动量分布演化的变态伏拉索夫方程，并在一阶旁轴近似下研究出一种半解析计算方法。

In this case, a decision analysis method based on extension of rough set theory is proposed .This method replaces indiscernibility relation in original rough set theory with the "indiscernibility-similarity-dominance" relation and obtains rough approximation of knowledge, it will not only be able to resolve the aboved-mentioned problems but also deal with inconsistence in decision table.

针对这种情况，给出一种基于扩展粗糙集的决策分析方法，该方法使用&不可区分-相似-优势&关系代替经典粗糙集中的不可区分关系来获取知识的粗糙近似，不但能够解决上述问题而且还能处理决策表中可能存在的不一致现象。

How to solve the Fokker-Planck equation depicting the kinetics of dc SQUID with a resistively shunted resistance will be introduced in Chapter 3. The effect of the shunted resistance is researched using the method of expanding a small parameter and the results are well agreed with the numerical simulations.

第三章主要介绍利用小参数展开的方法近似求解带有桥式电阻的DC SQUID，研究了桥式电阻大小的引入对器件性能的影响，得到了与数值模拟方法一致的结论。

A simplified model was proposed to simulate material microstructure according that metal solidification is a Monte Carlo process. First, use the point of"putting randomly, growing uniformly"to generate grain boundary, then recognize grain boundary trifurcate points, eliminate bad trifurcate points, and distinguish the connections among these points, thus obtain straight grain boundary picture.

根据金属凝固过程是—Monte Carlo过程，建立了金属材料显微组织的简化Monte Carlo方法，采用&随机投放，等速生长&的方法形成矩齿形晶界图，并通过逐点判断法识别出晶界三重点，剔除奇异三重点，并识别出晶界及晶界间相邻关系，从而获得晶界结构的直线近似形态图，为细观组织短裂纹的数值模拟作好准备。

A simplified LLR ordering scheme employed in uncoded systems and an exact LLR ordering scheme employed in coded systems are proposed.

在未编码情况下给出使用线性检测器近似的对数似然比信息排序方法，在迭代检测解码情况下给出使用解码器反馈的比特后验信息进行对数似然比排序的方法。

Then,use the criteria of area,volume,and welding seam length to analyze the merits of the different ways to develop on undevelopable curved surface.

对同一不可展曲面的展开可有多种近似展开方法，究竟哪种方法更为合理应建立相应的评判标准。

In the research on the backward-wave oscillation suppression the startoscillation current which is derived from Two-wave theory approximately is given up. Four typical un-uniform slow wave structures start-oscillation current equations are derived by backward-wave amplifing gain expressions with the Two-wave theory. Then the start-oscillation current rates I〓/I〓 between ununiform circuit and uniform circuit of the four structures have been got.

在返波抑制问题的研究中，从二波理论出发，抛弃了二波理论中从起振条件出发来得到起振电流近似表达式的方法，而是利用二波理论的基本关系式分别推导出了四种典型实用的非均匀输出线路的返波增益表达式，采用计算返波增益的方法来得到四种非均匀输出线路的起振电流与均匀输出线路起振电流的比值I〓/I〓。

The simulation results show that the proposed method can give approximate boundaries much closer to true boundaries than the method by unweighted LS-SVM.

仿真结果表明，采用本文方法比采用一般最小二乘支持向量机的方法所得的近似边界更接近精确边界。

On the basis of a simplified assumption that the target loci are introgressed and the genetic background are independent,the probability of selecting individuals with desired genotypes in each generation is approximately estimated combining analytical approach and simulation according to the graphic genotypes of backcrossing parents.The minimal sample size required to obtain at least one desired individual with a given probability is estimated.

在假定所需转移的目标基因座与遗传背景之间为相互独立的简化假设下，可以通过将解析方法与基于回交亲本图示基因型的模拟方法相结合，近似地估计出在每一世代中选到所需基因型的概率，进而估算出在一定概率水平下至少获得一个符合要求的个体所需的最小样本容量。

By using a method of three-dimensional counterchanges, the true area of an apples surface can be calculated, based on the fact that an apple is an approximate sphere (this fact is approved in the paper).

论文基于苹果是一个近似的球体这一事实(并在论文中验证了这一点)，利用一种空间变换的方法将苹果的真实面积求取出来，这种方法更加合理地反映了苹果上面红颜色的面积百分比。

Singer Leona Lewis and former Led Zeppelin guitarist Jimmy Page emerged as the bus transformed into a grass-covered carnival float, and the pair combined for a rendition of "Whole Lotta Love".

歌手leona刘易斯和前率领的飞艇的吉他手吉米页出现巴士转化为基层所涵盖的嘉年华花车，和一双合并为一移交&整个lotta爱&。

This is Kate, and that's Erin.

这是凯特，那个是爱朗。