查询词典 approximation methods in physics

Most of hob design for non-involute gears are nowadays taken by approximation method.For example,the normal sectional profile of hob worm therad is usually regarded approximately as its basic rack profile.Recently, some new methods have been developed in this respect but, perhaps, they appear overelaborate since the principle of spacing engagement is based on. For this reason , the paper offers a new design procedure for hob worm based on the planar engagement principle with the intention of simplific...

本文应用平面啮合原理精确设计各种非渐开线齿轮滚刀的基本蜗杆，提出并应用啮合线的投影原理从工件齿轮端截面的啮合线直接求得刀具蜗杆的端面齿形，而不必求出媒介齿条的齿形，方法很简单，还从啮合线的投影原理简明而形象地证明了一对螺旋齿轮直接啮合过程的啮合线是一条垂直于齿向的平面曲线。

This has offered theoretically approximation and finite element methods so as to complement the theory of fractal interpolation cambers.

本文最后不但列举了现代数学分析方法在阳极焙烧及其热工过程中的具体应用途径，而且在求解热工微分方程近似解时提供了计算技巧。

The wavelet network imbibes advantages of both methods ,while has well function approximation capability and fault-tolerance capability at the same time.

小波神经网络吸收了二者的优点，因而具有较强的逼近能力和容错能力。

By using a mean field approximation, the process of lthium intercalation into carbon materials was analyzed theoretically. GICs with less than 4 stage form when lithium intercalates into graphite by electrochemical methods. The capacity of lithium intercalating into carbon materials depends on the energy dispersion of lithium site in carbon.

通过平均场近似从理论角度分析了锂在石墨材料和碳素材料中的电化学插入过程，结果表明：锂插入到石墨中一般只形成4阶以下插层化合物，容量可达到LiC〓；而在碳中锂的插入量，根据锂可插入位置能量分布不同，一般小于锂在石墨中的插入量。

In this paper, the sparse approximation inverses and eigenvalue translation based preconditioners for Krylov subspace methods are thoroughly researched by situation of research at home and abroad, their internal mechanism are studied also.

本文在国内外关于Krylov子空间方法的稀疏近似逆和基于特征值转换的预处理方法研究状况的基础上，对它们进行了进一步研究，探讨了它们的内部机理。

Based on the conservation law, applying appropriate rezone methods for meshes we modify the 9-point method to reduce computation error due to poor regularity of the meshes and low precision due to the approximation to vertices values by an average of neighboring cell values. The nonlinear system obtained is a different system from the 9-point scheme.

该方法从守恒方程出发，将九点差分格式应用于按某种合适的方式进行重分之后的网格上，减少由于网格正则性差以及网格节点上的物理量采用周围网格量的加权平均等原因所引起的计算误差，得到一个新的但其解仍然逼近原来网格上的物理量的方程组。

Finally, the experimental results show that the approximation methods are correctness and effective. As an application, generating quasi arc-length parameterization of PH curves is also discussed.

最后通过具体逼近实例验证了文中算法的正确性和有效性，同时给出了它在PH曲线准弧长参数化中的应用。

The experimental results show that the proposed ACA with the roulette wheel selection can obtain better performance than that generated by the conventional polygonal approximation methods.

实验结果显示，我们所提出的ACA方法以轮盘的赌轮选择，比传统多边形逼近法可获得更好的表现。

Since RKPM is a kind of Galerkin meshfree methods, in this thesis, penaltyfunction method is employed to enforce the essential boundary conditions,trapezoidal rule is used for the approximation of displacement field function, Gaussand Hammer quadratures are applied for the numerical integration of systemequation,self-adapting method is applied for confirming the support of the pointinterpolated.

针对 RKPM 是一种伽辽金型的无网格方法，本论文采用罚函数法引入位移边界条件，用梯形积分法则近似位移场函数，对系统方程进行积分时分别使用了 Gauss 积分和 Hammer 积分，采用自适应的方法确定计算点的定义域。

Two examples are given to show the effectiveness of these two methods, and the results are compared with Legendre approximation.

最后通过2个实例验证了这2种逼近方法，并与Legendre逼近方法进行了比较。

Tom: You are right, he worked hard all the time.

你是对的。他一直都是努力工作。

Take shortcomings,failures,and mockings of others as commonplace and a drive to complete oneself,hold your own opinion over the evalution and disscution divested from others,afterwards sink into the state of eliminate mistakes if any or encourge oneself being not being influenced by the sayinngs of others or having no ideas to do.

把缺点、失败及别人的耻笑等看成是一种常事，当成完善自己的动力，对别人的评价和议论自己心中有主见，做到&有则改之，无则加勉&，不为人言所左右或无所适从。