The accurate pattern of galactic spiral arms

The Maintenance of the Spiral Arms in a Spiral Galaxy

旋涡星系中旋臂的维持

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The spiral waves with mixed-mode oscillatory local dynamics are first studied using the coupling allosteric reaction-diffusion system, which gives rise to the observation of the arm-splitting phenomenon of the spiral waves. It is the first time to discover the complex sub-structure within the spiral arm.

研究了局域动力学为混合模式振荡的螺旋波动力学，发现了螺旋波的波臂分叉现象，这是第一次在螺旋波波臂内部发现复杂次级结构的存在。

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The relation between elliptical polarization with axial ratio of radiation pattern for equiangular spiral antenna and its arm length

平面等角螺线天线方向图极化椭圆轴比与臂长的关系

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Far out in the uncharted backwaters of the unfashionable end of the western spiral arm of the Galaxy lies a small unregarded yellow sun.

在古老银河系的螺旋状西臂末端，任何地图都还没标示过的蛮荒地带，有个丝毫不引人注目的小小黄色恒星。

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Two-Dimensional Milky Way Spiral Arm Contrast

两维银河系旋臂对比度

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This solution can more accurately investigate the outer spiral arm of dish-like galaxies.

此解可用来更精确地研究盘星系的外围旋臂，把过去得到的星系旋臂图样的精确程度提高一步。

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The less the ratio η is, the more tightly the spiral arm winds up.

系数η越小，则旋臂越紧卷。

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On the basis of theses models, the paper makes a lot of calculations, simulations and analysis on the stationary state and the transition state characteristic of the micro robot, and also optimizes the spiral angle of the micro robot.

在此基础上，对微机器人的稳态游动特性和瞬态游动特性进行了仿真计算和研究分析，并对微机器人的螺旋升角进行了优化设计。

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Controlling the position of a roller properly, the relative position between the cylinder and roller will be change so that a additional spiral angle will be produced. Therefore the relative axial motion of the cylinder can be controlled effectively.

调节从动轮的位置，可以改变筒体和滚轮的相对位置，产生附加螺旋角，能有效控制简体的轴向运动。

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The velocity moment increases slightly with the radius in radial sections, while the distribution is not constant in spiral angle, but its averaged value tends to be a constant in the volute;

速度矩沿径向的分布随半径增大略有提高，沿蜗壳幅角方向的分布不等于常数，但其平均值基本不变；

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The relative spiral angle and pressure angle errors were defined and introduced into the evaluation of the teeth mating precision, which had been carried out by the measurements of teeth form and pitch errors.

通过引入相对螺旋角误差与相对压力角误差的概念，对齿形与齿距误差进行了测量，从而评价了轮齿研齿前后的实际啮合精度。

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Including the calculation of the specific heat transfer area, spiral angle, and computing the distance between baffles, helical baffles the geometry of the design, strength calculation and so on all parts.

具体包括换热面积的计算、螺旋倾角及折流板间距的计算、螺旋折流板的几何形状设计、各部件强度计算等等。

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And 34 × 7 multilayer strand non rotation ropes have such structure and technical characteristics as strand having the same structure, strand ing layer ropes according to equal spiral angle.

17×7类、34×7类多层股不旋转钢丝绳具有组绳股结构相同、层绳按照等捻角分层捻制的结构特点和工艺特点。

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Performance of compressor is very wide difference when spiral angle and rotor lead of compressor are different even if rotor profile is same and rotor diameter is equal.

即使是相同类型的转子型线和直径相等的阴、阳转子，当阴、阳转子的螺旋角和导程长度不等时，压缩机的性能也有很大差别。

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This type of two shell sides solve the problems caused by spiral angle, poor transforming heat property and increasing pressure drop in large diameter heat exchanger.

这种双壳程结构解决了在大直径换热器上由于采用单壳程螺旋折流结构所形成的折流倾角小、传热性能下降及压力降增大的弊病，具有良好的推广应用前景。

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The relationship of these major parameters such as groove numbers and spiral angle to seal pressure is revealed and the optimized result is obtained.

分析了影响密封性能的主要设计参数如螺旋角α，槽数n等对密封压力的影响规律，得出了优化结果。

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The three parallel axis gear-bearing-rotor system dynamic characteristics change little while skew gear spiral angle varies between 8 degree and 20 degree.

斜齿轮螺旋角在8度到20度间变化时，三平行轴齿轮轴承转子系统的振动特性基本没有变化。

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A method to improve the dynamic characteristics of gear system is proposed through the selection of spiral angle of helical gear according to gear system dynamics theory.

以齿轮系统动力学理论为基础，提出了通过斜齿轮螺旋角的择优选取改善系统动态特性的方法。

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The influence of the bearing structure, eccentricity, spiral angle, rotating speed and critical shear stress on slip degree is studied.

研究了轴承的结构、偏心率、螺旋角、转速和极限剪应力对滑移程度的影响。

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Distribution of Microfibril Spiral Angle of Cotton Fibre and Relative Orientational Index of Cellulose Crystallites in Cotton Plant

棉纤维的微原纤螺旋角和纤维素微晶相对取向指数在植株中的分布

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