交替变换

The technique of boundary-fitted coordinate system is used to overcome the difficulties resulting from the complicated shapes of natural river boundaries;the method of alternating direction implicit finite difference scheme is used to solve the partial differential equations in the transformed plane;and the technique of moving boundary is used to deal with the river bed exposed to water surface.

用适体坐标技术克服天然河道复杂的几何边界给有限差分法所带来的困难；用交替方向隐式有限差分格式求解变换平面上的偏微分方程；用动边界技术处理河床的淹露。

For example, at 250 ℃ steam valve, the use of asbestos packing and co-lead by alternative Diego, the situation would reduce the steam leakage; some valves, medium constantly changing, such as the asbestos packing and Teflon tape common use, seal it better.

例如，在250℃蒸气阀门中，用石棉盘根和铅圈交替迭合，漏汽情况就会减轻；有的阀门，介质经常变换，如以石棉盘根和聚四氟乙烯生料带共同使用，密封效果便好些。

A swimming stroke ; arms are moved alternately overhead accompanied by a flutter kick.

一种游泳方式；胳膊在头顶交替变换并且伴着脚排击水面。

The new learning algorithm and theory are based on alternating Updating principle between hidden viable structure of field organization transformation and the parameter of field action transformation.

提出了基于场组织变换结构表示的估计与场反应变换参数估计交替结合的学习理论和算法。

Tyr's symbol is a set of scales resting on a warhammer.

面罩的符号是一个黑，交替变换的面罩。

In chapter 1, Galerkin alternating-direction procedures and an approximation to the Jacobian of the isoparametric map are applied to discuss a three-level and a four-level Galerkin alternating-direction procedures for two kinds of nonlinear hyperbolic equations which are given on a nonrectangular, curved region.

第一章结合[10]中对矩形域上双曲型问题提出的交替方向有限元方法和[19]中利用等参元，等参变换的Jacobi行列式的逼近来研究的思想，给出了两类非线性双曲型方程在非矩形域上的交替方向有限元方法。

These moods are the children of the blood and humours.

这些情绪来去匆匆，交替变换，就形成了我们的一般的心理特征。

Our bus followed a lonely road, winding through wild lands where the scenery changed by the hour, from high mist-clad cloud forests into gently undulating hills before flattening out inside a landscape of swamp, savannah and, jungle.

长途汽车沿着荒无人烟的公路行驶，在野地里蜿蜒而过，窗外的景色不时交替变换：从浓雾笼罩的高山雨林，到此起彼伏的丘陵，地势渐渐平缓，间或出现一片沼泽、草原或丛林。

Basic characteristics of cosine transform spectrum were analyzed, where contour lines of 2D cosine transform of point mass present the shape of a quarter of concentric circles and the number of counter become small along with the increasing of wave numbers. The spectrum of vertical rectangularcylinder put up periodic zero counters which mark off quadrate areas, the values of counter in each areas alternately change between the plus and the minus, and with the increasing of wave number, the values of counter present attenuation character alike e exponent.

分析了点质量和直立矩形柱体重力异常余弦变换谱的基本特征：点质量二维余弦变换谱等值线呈1/4同心圆形状，等值线随着波数的增大而变稀；直立矩形柱体谱出现了周期性变化的零等值线，该等值线将非零等值线划分为a×b个矩形区域，而且等值线值在各矩形型区域中正负交替变化，随着波数的增大，不同的矩型域中等值线值呈e指数衰减特征。

Due to conducted or radiated EMI from inner or outer coupling circuits,breathing can exist in current-mode controlled Boost converter.It exhibits as a time-bifurcation undergoing regular period-1,subharmonics and chaos orderly and repeatedly for a long period.

本文揭示了在电流模式控制Boost变换器中，由于存在内部或外部耦合电路引起的传导和辐射干扰，使得有可能产生呼吸现象，这是一种以较长的周期按顺序交替历经规则、分谐波和混沌状态的时间分叉现象，在功率变换电路中是一种非正常的工作状态。

As she looked at Warrington's manly face, and dark, melancholy eyes, she had settled in her mind that he must have been the victim of an unhappy attachment.

每逢看到沃林顿那刚毅的脸，那乌黑、忧郁的眼睛，她便会相信，他一定作过不幸的爱情的受害者。

Maybe they'll disappear into a pothole.

也许他们将在壶穴里消失