螺旋运动

The length of central region of the cell decreases with the increasing oscillation amplitude and Strouhal number. The movement of Brownian particles can be either periodic or chaotic from whichever region the particles originate.

模拟结果表明，涡胞中心区质点的运动有强周期性，轨迹呈螺旋形状，而边缘区质点的运动是一种混沌行为，两区的质点被分界线隔开；中心区宽度随振幅、Strouhal数的增大而减小；布朗粒子的分子扩散效应可以克服两区分界线的限制。

The theory of reciprocal screws is used to determine the independent controllable variables in the Cartesian space, and the mapping between the controllable velocity components in t...

文章用反螺旋理论通过建立独立运动变量和关节变量的运动模型，使机器人末端可控变量与关节变量成一一对应关系。

The properties of their orbit and phase space transmission and the effects of space charge are calculated.

然后详细介绍了目前最常用的螺旋扇型静电偏转镜的基本工作原理，如参考粒子的运动轨道及偏转镜的光学性质等，讨论了螺旋线型静电偏转镜中空间电荷效应的影响。

To implement this guidance law, the thesis purposed one new target state model and adaptive algorithm for radar homing missile attacking maneuvering target, which is based on the slowly changing of the tangential acceleration and the normal acceleration of the spiral maneuvering and snaking maneuvering in target trace frame coordinate system, and on that the most of them equipped with Strapdown Inertial Navigation System, to meet the demand of the advanced homing missile to target state, It can estimate target position, velocity and acceleration accurately by real-time processing.

为了实现该制导律，重点针对先进自寻的制导律对目标机动运动状态的需求和导弹系统大都具有捷联惯导系统的条件，基于目标螺旋机动和蛇形机动的切向加速度和法向加速度在目标轨迹活动标架上缓变的特点，本文提出了一种建立在目标轨迹活动标架上的运动状态方程和扩展观测方程的自适应估计算法。

In this paper,the kinematic equations of flow of Newtonian fluid of helical flow in eccentric annulus were transformed by the method of undetermined coefficient,the calculation formula of pressure gradient of flow of Newtonian fluid of helical flow in eccentric annulus was obtained.

本研究利用待定系数法对 Newton 流体偏心环空螺旋流动的运动方程进行了变换，得到了给定流量情况下 Newton 流体偏心环空螺旋流动的压力梯度的计算公式。

Letting the commonly used double-staged 2K-H typed differential mechanism be combined with the overrunning clutch this method achieved the operation without differential while the settlings were on sedimentation.

E书简介：摘要：传统卧式螺旋离心机在物料沉降分离时，对转鼓与螺旋输料器的相对运动所产生的搅动现象，提出一种差速传动机构改进方法。

Letting the commonly used double-staged 2K-H typed differential mechanism be combined with the overrunning clutch this method achieved the operation without differential while the settlings were on sedimentation.

传统卧式螺旋离心机在物料沉降分离时，对转鼓与螺旋输料器的相对运动所产生的搅动现象，提出一种差速传动机构改进方法。

With the conception of sports, life, and nature, and on the basis of the explanation of the Olympic spirit, life and sports, the design expresses and emphasizes the civilization history of China, and its unique humanism. Through 16 spatial series embodying the Olympic spirit and sports, the theme axis is built up to express human spiritual activities ascending in spires and subliming.

围绕着体育、生命、自然三位一体的设计理念，在对奥运精神和运动主题进行诠释的基础上，表达了中国的文明历史和独特的人文精神。16个体现奥运精神和运动主题的序列空间，联结成一条表达人类精神活动螺旋上升、直至升华的主题轴线。

Feed aprons and stock guide plates with different angles and spacing are being equipped inside the cylinder, the structure can ensure that the material being dried runes along the direction of screwing under the impact of gravitation and keeps for a sufficient maintaining times and dispersity in the cylinder to make the material has sufficient heat exchange with the heat airflow from air heating furnace inside of the cylinder.

三筒烘干机是引进欧洲先进技术，由三个不同直径的同心圆筒彼此相嵌组合而成的。筒内装有不同角度和间距的扬料板和导料板，这种结构能够保证被烘干物料在重力作用下沿着螺旋的运动方向运动，在筒内保持足够的停留时间和充分的分散度，使被烘干物料在筒内与来自热风炉内的热气流进行充分的热交换。

The result showed that the strong storm followed by mesoscale squall line was primary cause of strong sandstorm producing, steps and ladders short wave trough of 500 hPa was great criterion triggering system for the mesoscale squall line producing, the essential dynamic condition was provided by distortion field and the mesoscale low pressure of 700 hPa for the strong sandstorm forming and maintaining in mid-west of Hexi Corridor, the deep vertical circulation development condition was basic power that urged squall line to occur and sand dust to curl up, which was provided for the deep convection development by superimposition of lifting movement before ground cold front and ascendant current of secondary circulation in upper air jet entrance region, temperature and the barometric gradient around the cold front was enlarged by enhancement of ground thermal low and temperature diurnalvariation of afternoon, by which essential thermal energy unstable condition was provided for the gale and strong sandstorm eruption, the strong sandstorm appeared in downstream of -200 m^2s^(-2) center of vertical helicity, the vertical helicity had good instruction significance for development of squall line and landing region of sandstorm, the mesoscale squall line occurred in unstable stratification, basic condition of potential energy transforming as kinetic energy was provided by strong unstable stratification for the strong sandstorm forming and developing.

结果表明：中尺度飑线所伴随的强风暴是产生强沙尘暴的主要原因；500 hPa阶梯短波槽是中尺度飑线产生的大尺度触发系统，河西走廊中西部700 hp变形场、中尺度低压为强沙尘暴形成和维持提供了必要的动力条件；地面冷锋前上升运动与高空急流入口区次级环流的上升气流的叠加，为深对流发展提供了深厚的垂直环流发展条件，是促使飑线发生和沙尘卷起的基本动力；地面热低压的加强和午后气温的日变化加大了冷锋前后的温度和气压梯度，为大风、强沙尘暴爆发提供了必要的热力不稳定条件；强沙尘暴出现在垂直螺旋度为－200平方公尺/s^2中心的下游，垂直螺旋度对飑线的发展和沙尘暴的落区具有较好的指示意义；中尺度飑线发生在不稳定层结内，较强的不稳定层结为强沙尘暴形成、发展提供了位能转化为动能的基本条件。

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