变变

There are some information about the development of soft switch and welding machine. There are also introduce some methods about the athwart invert current and how to realize it. At last we introduced the structure of DSP and how to design the module by software.

在本论文中首先介绍了软开关技术和电焊机的一些发展，然后介绍了几种典型的逆变电路和实现逆变的方法，最后讲述了DSP的硬件结构和模块以及控制软件的设计方法了软件中的模块。

The general correlation theories are presented to discuss the existence condition of a variation principle, which is named as the athwart problem of a variation principle.

本文较为系统地讨论了建立变分定理的前提条件(本文称之为变分定理的逆问题)的具有普适性的泛函相关理论。

The lattice constant, atomic moment and the anisotropic magnetostriction exhibit abrupt changes at about 42 K, which is connected with the first-order structural transition and indicative of a strong coupling between magnetism and crystal structure.

晶格常数、磁矩和各向异性磁致伸缩常数在42K都有一个迅速跳变，这与一级结构相变密切相关。

The results indicate that the effect of alloying elements V and Cr on mechanical properties at room-temperature, creep behavior and microstructures are similar. With increasing contents of V and Cr, their mechanical properties produce little change, the creep resistant property decreases and microstructure grows, which is mainly due to their characteristics of β-stability element and smaller atomic radius compared with Ti. On the contrary, the effects of V and Cr on the thermal stability are quite different. With increasing V content or decreasing Cr content the thermal stability for the alloy becomes better, which may be due to the different solution characteristics of V and Cr element in titanium alloy that V belongs to isomorphous β-stability element and Cr belongs to eutectoid β-stability element.

结果表明：合金元素V和Cr对Ti40合金室温力学性能、蠕变行为和组织的影响具有相似性，即随V和Cr含量的降低，合金室温综合力学性能变化不明显、抗蠕变能力减弱、组织粗化：这与V和Cr同属于β稳定元素、且原子半径都小于Ti原子有关；而V和Cr对于热稳定性能的影响则完全相反，V含量的增加或Cr含量的降低含金热稳定性能优化，其主要原因可能与V属于同品型β稳定元素而Cr属于共析型β稳定元素有关。

With the new concept,the problem of variable structure control of 2D discrete system is transferred to the problem of seeking a sliding model with good sporting character and attractability. The concrete design schemes of the imitative sliding model and variable structure controller are also put forward. And the concrete expression of the time T in ε-neighborhood of reaching switch manifold is obtained. The difficulty of applying the existing methods to MIMO systems is overcome.

在新概念之下，将2D离散系统的变结构控制问题转化为寻找一个既具有良好的运动品质又具有吸引性的滑动模问题，给出了滑动模及变结构控制器的设计方案，并且获得了达到切换流形的ε领域的时间T的具体表达式，克服了已有方法难以应用到多输入—多输出系统上的困难。

Auld wants to be young,guly wants to become beautiful.

老的想要变年轻，丑的想要变漂亮。

The changing temperature autolysis of spent brewer's yeast was researched,and the autolysis conditions were optimized as well.

研究了啤酒废酵母的变温自溶，并优化了变温自溶的条件。

This paper analyzes the characteristic of the Power Factor Correction of arc welding inverter power source , introduces the 12-pulse converter based on delta-type autotransformer connection into arc welding inverter power source ,and its configuration, design scheme and theory on PFC.

分析了弧焊逆变电源功率因数校正技术的特点，阐述了弧焊逆变电源中基于差接三角形自耦变压器十二脉波整流电路的原理与设计及其功率因数校正机理。

The many exact solutions and compact-like solutions uch as,trigonometric function,solitary pattern solutions, solitary wave solutions are given by the auxiliary equation method.

在第六章，我们将指数函数法(Exp-function method)应用到一类变系数非线性波方程中，借助计算软件Maple得到了组合变系数KdV-mKdV方程的广义孤立波解。

Its major feature is to reduce EMS memory allocation greatly by the help of two one dimensional arrays: one is used to deposite the elements within the band width of the matrix at input stage and latter store the elements within the band width of cholesky lower triangle matrix at output sta.

作者针对地球物理数值模拟中常碰到的大型稀疏变带宽方程组的求解问题，介绍了一种大型稀疏变带宽矩阵的存储方法及 Cholesky分解法。

And Pharaoh spoke to Joseph, saying, Your father and your brothers have come to you.

47：5 法老对约瑟说，你父亲和你弟兄们到你这里来了。

Additionally, the approximate flattening of surface strip using lines linking midpoints on perpendicular lines between geodesic curves and the unconditional extreme value method are discussed.

提出了用测地线方程、曲面上两点间短程线来计算膜结构曲面测地线的方法，同时，采用测地线间垂线的中点连线和用无约束极值法进行空间条状曲面近似展开的分析。