迭代法

By the use of CAD method to carry out the research on key problems of three ring typed less teeth difference reducer-the inner and outer gears have to be designed by adopting modified transmission was advanced. And to study a method for carrying out numerical calculation by adopting the powerful functioned mathematical software MATHCAD in the solution of coincidence extent on less teeth differenced internal messing and in iterative computation for equation set of interference coefficient of tooth profile overlapping.

提出用CAD法研究三环式少齿差减速器设计的关键问题―内外齿轮必须采用变位传动的设计，并研究在求解少齿差内啮合的重合度和齿廓重叠干涉系数方程组的迭代计算中，选用功能强大的数学软件MATHCAD进行数值计算的方法。

This means that direct search methods can accept new iterates that produce simple decreasein the objective.

直接搜索法可用新的迭代来减少目标。

Contrast source inversion algorithm recasts the inversion problem as a minimization of a cost functional, thus an iterative sequence is formed to reconstruct the contrast sources and contrasts.

对比源反演算法将反演问题转化为求解成本泛函的极小值问题，从而形成重构对比源和对比度的迭代序列。

In this paper a new contingency screening and ranking method is formed by combiningiterative filtering screening technology with continuation power flow analysis. Researchingpreventive control policy in reactive power compensation and load control when themargin of stability is serious, and reciprocal math model is given;through the exempleof IEEE39 typical system , the availability of the discussed methods in this dissertationwas approved. Aimed at the real grid, the contingency screening analysis and preventivecontrol policy based on Beijing power grid is discussed;the static voltage stabilityanalysis software based on figure draw of Beijing grid is realized, and the software hasthe junction to BPA .

论文提出了将迭代过滤筛选技术和连续潮流法相结合的事故筛选分析方法；从无功补偿控制和负荷控制两方面研究了系统裕度紧张时的预防控制策略，给出了相应的数学模型；采用IEEE39节点的标准系统算例，验证了本文提出的静态电压稳定事故筛选分析方法的可行性；针对实际电网讨论了基于北京电网的事故筛选分析和预防控制策略；通过与BPA接口实现了基于北京电网图形平台的静态电压稳定分析软件。

The technique does not have any simplification of drainage holes. In this paper, discussions are mainly conducted on the substructure mesh dividing and its second time automatic dividing, the substructure shape, the continuity among substructures and general elements, the classification and definition of the integrated hydraulic model of drainage substructure, the iteration computation of water level inside drainage hole, the application of the technique in solving unsteady unsaturated seepage field, etc., therefore, the high efficient, precise and quantitative analysis of the complex seepage with densely distributed drainage holes is totally realized.

该技术不对排水孔幕作任何简化，本文着重从子结构网格划分模式及二次自动剖分、子结构单元形态、子结构与总体单元网格之间的连续性、排水子结构完整水力学模型分类及定义、排水孔内水位迭代计算、排水子结构法在非稳定非饱和渗流场中的推广应用等各个方面进行论述，实现了对工程复杂渗流场中密集排水孔幕的高效、精细、定量分析。

The distributions of velocity, velocity gradient, shear stress, clongation stress, first normal stress difference and pressure of the flow of a power-law fluid in the profile die were analyzed. It indicates that for a power-law fluid only after a few iterations a good convergence can be reached, even though in the case of high extrusion velocity.

本文分析了幂律流体在异型材挤出口模内的速度分布、速度梯度分布、剪切应力分布、拉伸应力分布、第一法向应力差分布和压力场，研究表明采用幂律流体模型，即使在挤出速度非常大的情况下，经过有限次迭代，模拟计算都能够收敛，并得到合理的结果。

Fernald iterative backward integration method can find gauge point and calibration value for extinction coefficient inversion without other auxiliary equipment when airborne lidar is used for low altitude detection.

Fernald迭代后向积分法能够在不利用其它辅助设备的情况下，找到进行低空探测机载激光雷达消光系数反演所需的标定点和标定值。

The solubility of 2 -hydroxybenzoic acid was measured in supercritical carbon dioxide with and without cosolvents, such as cyclohexane and ethanol,within a temperature range of 308.15-328.15 K,and a pressure range of 10.0-24.0 MPa,by flow method.

该模型迭代速度快，需要的物性参数少。用流动法测定了2-羟基苯甲酸在温度308.15，328.15 K、压力10.0，13.0，16.0，20.0，24.0 MPa条件下，在超临界CO2中及有夹带剂环己烷、乙醇存在时的溶解度数据。

In order to reduce the computation complexity of the matrix-vector product and the iterative times in the process of matrix inversing, a new wavelet-like preconditioning operator based on the lifting scheme is used.

一种新的基于提升法的类小波变换预处理算子的使用，降低了矩阵向量积的计算复杂度和求逆过程中的迭代次数。

The gap element method is proposed in the paper for two kinds of problems, which include contact problem and gap joint problem. Elasticity contact problem falls into the category of unknown boundary value problems. It follows that the contact area and contact conditions or states can never be determined without special mathematical analysis, which is a very difficult work. The boundary conditions of the contact surfaces are deduced.

文中给出了间隙元法在空间可动部件接触问题中的应用，推导了其几何边界条件和力学边界条件，利用虚功原理推导了含间隙元弹性接触问题的有限元方程式，给出了其数值解法的迭代步骤，并指出了利用间隙单元进行分析的特点。

But we don't care about Battlegrounds.

但我们并不在乎沙场中的显露。

Ah! don't mention it, the butcher's shop is a horror.

啊！不用提了。提到肉，真是糟透了。