螺旋

It is found that traveling waves with either lower frequency or higher frequency can both eliminate the anti-spiral waves, while only the target waves with lower absolute value of frequency can eliminate the anti-spiral waves.

数值计算表明，对于行波，无论是低频行波还是高频行波，都可以成功地消除系统中的反螺旋波；而对于靶波，只有低频靶波才可以消除反螺旋波。

They have used Franko Lin and Wilkins's judgment, and supplemented: The phosphoric acid radical constitutes more than two nucleotide chain's skeleton in the screw flank, the direction is opposite; Basic group in spiral inside, 22 correspondences.

他们采用了富兰克琳和威尔金斯的判断，并加以补充：磷酸根在螺旋的外侧构成两条多核苷酸链的骨架，方向相反；碱基在螺旋内侧，两两对应。

The spiral angle of graduated circle was rough estimated by measuring the addendum circle diameter and modified on milling machine.

介绍了精确测绘单一斜齿圆柱齿轮齿形参数的简便方法，即测量公法线长度计算基圆齿距从而查表确定模数和压力角；测量齿顶圆直径估算分度圆螺旋角，用分度头在铣床上修正分度圆螺旋角，并进行误差分析。

According to the helix theory , the algebraic sum value of all rotations of dihedral angle helix is equal to zero in the structure of 1,3-disubstituted cyclohexane derivatives.

按照螺旋理论，1，3-二取代环已烷衍生物的结构中存在的二面角螺旋旋光度代数和为零，不应具有旋光性，但是它们却是光学活性的。

The spiral curve structure can be used in slow-wave systems. Theoretically an analytic description for spiral curve slow-wave systems can be achieved after much simplification and approximation.

螺旋线结构就可以作为慢波系统；理论上，经过很多的简化和近似，可以得到关于螺旋线慢波系统性能的解析描述。

ABSTRACT In this paper, an investigation on the helical ports was carried out in a steady-flow rig. The three velocity Components of air flow through the intake valve of several typical helical ports were measured by hot-wire anemometry for analysing the relationships between intake port geometry and swirl level as well as flow resistance.

本文在稳流气道试验台上对螺旋进气道进行了大量的研究，为了分析螺旋进气道的结构形状与涡流强度及流动阻力的关系，采用热线风速仪测量并分析了不同气道的气门口气体流速。

The result difference of the accuracy that 16 helix CTA diagnoses to aneurism and DSA does not have statistical significance.

结果329例中的181例患者发现202个颅内动脉瘤。4个动脉瘤CTA漏诊，而DSA检查过程中7个动脉瘤未能清楚显示。16层螺旋CTA诊断所有动脉瘤的敏感性、特异性和准确性分别是98%、98%和98%。16层螺旋CTA对于动脉瘤诊断的准确性和DSA的结果差别没有统计学意义。

By changing the value of the blade thickness, cone angle, lead and height of fillet weld, influences of these parameters on the strength and displacement of the screw conveyor are investigated which form the base for optimization of the conveyor structure.

论文还通过调整螺旋输送器的叶片壁厚、半锥角、导程和焊角高等几何结构参数，研究了各参数的变化对螺旋输送器强度和变形的影响，为结构优化设计奠定了基础。

The Watson-Crick DNA double-heli-cal structure is a 10-fold C10 residues per turn double helix with antiparallel strands.

沃森，克里克DNA双螺旋- Cal的结构是一个10倍C10残留每转）与反平行双螺旋链。

The cutting pattern and load curves of cutting process of the two cutting heads were given by computer simulation, which showed that the cutting performance of the cutting head with pick arrangement based on equal-rise-angle spiral line was good because of its reasonable pick cut, its uniform cutting pattern and the small value and the fluctuation of its load.

为了评价利用等螺旋升角进行截齿排列设计的截割头的截割性能，选用了一个实际的截割头进行比较，通过计算机仿真获得两个截割头截割过程的切屑图和载荷曲线，经比较分析表明，用等螺旋升角排列截齿的截割头截槽合理，各段切屑图均匀，载荷大小及其波动较小，截割性能良好，所以用等螺旋升角排列截齿是一种高效、实用的截齿排列方法。

Neither the killing of Mr Zarqawi nor any breakthrough on the political front will stop the insurgency and the fratricidal murders in their tracks.

在对危险的南部地区访问时，他斥责什叶派民兵领导人对中央集权的挑衅行为。

In fact,I've got him on the satellite mobile right now.

实际上 我们已接通卫星可视电话了