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Exive least-squares solutions, antire?exive least-squares solutions, bisymmetric least-squaressolutions, symmetric and antipersymmetric least-squares solutions, symmetric or-thogonal symmetric least-squares solutions, symmetric orthogonal antisymmetricleast-squares solutions and their optimal approximation to the linear matrix equa-tion AX = B, and solve them successfully. 2. For Problem II, we can convert it to another problem of finding the least-squares solutions with the least norm of a new consistent matrix equation. Onthe base of the solutions of Problem I we can apply the iterative method to get

本文所构造的迭代法的优点在于先利用法方程变换将求矩阵方程的最小二乘解转化为求一个相容矩阵方程的解的问题，再利用迭代法对于任意给定的初始矩阵进行迭代，均可在有限步内迭代出所求问题的一个解；可将问题II转化为求新方程的极小范数解的问题，同样用迭代法求解，从而系统且全面地解决了问题I、II在约束矩阵类如中心对称、中心反对称、自反矩阵、反自反矩阵、双对称、对称次反对称、对称正交对称、对称正交反对称矩阵中的最小二乘解及其最佳逼近问题。

Chapter 2 is devoted to study of exact solutions of the nonlinear evolution equations. Using solutions of a Bernoulli equation instead of tanh in tanh-function method we find some more general solutions of the KdV-Burgers-Kuramoto equation , and by using the nonlinear telegraph equation we show that there are many different choices on its balancing number m and the power n of the nonlinear term in Bernoulli equation by which we can recover the previously known solutions and also can derive new square root type solitary wave solutions. Exact solitary wave solutions for a surface wave equation are obtained by means of the homogeneous balance method. We also present an approach for constructing the solitary wave solutions and non-solitary wave solutions of the nonlinear evolution equations by using the homogeneous balance method directly, which is also used to find the steady state solutions, solitary wave solutions and the non-solitary wave solutions of the 2+1 dimensional dispersive long wave equations. The soliton-like solutions of the BLMP equation and the 2+1 dimensional breaking soliton equation are found by use of the symbolic-computation-based Method.

第二章中研究了非线性发展方程的精确解：用双曲正切函数法中的双曲正切函数换为Bernoulli方程的解的方法而给出KdV-Burgers-Kuramoto方程的精确解并用非线性电波方程为例说明了平衡数m和Bernoulli方程中非线性项的次数n有着多种选择的可能，它不但使我们能找到已知解而且也能找出新的根式孤立波解；用齐次平衡法给出一个曲面波方程的精确孤立波解，并提出直接用齐次平衡法寻找非线性发展方程的孤立波解、非孤立波解的方法，作为应用给出2+1维色散长波方程组等的定态解、孤立波解、非孤立波解等；用Symbolic-computation-basedMethod获得BLMP方程和2+1维破裂孤子方程的类孤子解；提出sine-Gordon型方程的直接求解方法，并获得sine-Gordon方程、双sine-Gordon方程、sinh-Gordon方程、MKdV-sine-Gordon方程和Born-Infeld方程等的精确孤立波解。

Wellsite Date Solutions is a new software company still in the early stages. Currently we are looking for a handful of core programmers to work from home to begin with.

Wellsite Data Solutions是一家处于筹备初期的软件公司，我们目前需招募一批核心程序员进行开发和设计工作，暂时工作方式为在家办公。

This is the website of Genomic Solutions.

这是Genomic Solutions的网站。

With our head office in London at Korona Solutions HQ, and our main test facility in Belfast, we're able to source and evaluate the very latest technology as fast as any other site on the planet.

我们的总部在伦敦Korona Solutions HQ，我们的主要实验设施在贝尔法斯特，我们可以跟全球其他网站一样快的获得并评估最新产品。

But to chemists solutions are things that are still all mixed up.

但是，对化学家来说， solutions的意思是液体混合在一起的「溶液」。

With airport installations in more than 50 countries worldwide, CONRAC is one of the market leaders for the supply of FIDS and PIDS, offering the displays as well as complete system solutions.

机场设施与全球50多个国家、德国CONRAC是市场的领导供应航班理睬，提供展品的完整体系以及solutions.hardware、软件和培训。

ZEKS Compressed Air Solutions is a leading manufacturer and provider of compressed air treatment equipment and services.

ZEKS Compressed Air Solutions是一家领先的压缩空气处理设备制造商及服务供应商。

The Bar Solutions line is available in six varieties: Bloody Mary, Mojito, Margarita, Cosmopolitan, Pomegranate and Wild Blueberry.

Bar Solutions系列包括六款产品：血腥玛丽、莫吉托、玛格丽塔、柯梦波丹、石榴酒和野生蓝莓。

Commercial products are already being sold by a host of companies such as Perpetuum in Britain and Ferro Solutions, Midé Technology, KCF, TPL and MicroStrain in America.

一些公司已经推出相关的商业产品，包括英国的Perpetuum公司，美国的Ferro Solutions， Midé Technology， KCF以及TPL等公司。

The big eared hedgehog, the little owl, the sand gecko, the three-toed jerboa, and every show needs a villain - saw-scale - the viper!

大耳刺猬，小猫头鹰，沙壁虎，三趾跳鼠，每场戏都需要反派角色：蝰蛇。

Plasmodiophora brassicae ; resting spores ; density gradient centrifugation of sucrose ; ultrasonic disruption

根肿；休眠孢子；蔗糖密度梯度离心；超声波破碎