变圆

Applying analytical method,the exact transfer matrix of circular arches with constant cross_section is derived.

由于结构本身的复杂性，对于变截面圆拱的自由振动很难获得解析解。

Numerical simulations by assemblies of circular panicles can qualitatively reflect the general characteristics of liquefaction behavior of sand. The interval effect of aspect ratio of elliptical panicle on the mechanical behavior of numerical sample is obtained, and the reason is related to the initial average co-ordination number. The regularity of evolution of fabric in the process of sand liquefaction under cyclic loading can be qualitatively achieved by using the numerical sample randomly mixed of panicles with different shapes. Numerical simulations can not only demonstrate the macro phenomenon of particle breakage, mostly importantly, it can also expose the evolution of particle breakage microscopically, and would contribute to further research of the micromechanics of particle breakage.

研究结果表明：Hertz-Mindlin非线性接触模型适用于变围压条件下砂土力学性质模拟；纯圆颗粒模拟能够定性地反映饱和砂土振动液化的一般规律；颗粒长短比变化对砂土力学性质的影响具有区间效应，其原因与粒间初始平均接触数有关；不同形状随机混合试样能够从定性规律上反映振动液化过程中砂土的细观组构演化规律；数值模拟不仅可得到颗粒破碎宏观响应，而且可以分析内部接触力变化和实现对粘结破裂位置的追踪，从而可进一步研究颗粒破碎细观力学机制。

Taking a single disk rotor with hinged ends as research object, to a different forward and backward whirling type the effect and its innate laws of the magnitude and acting direction of the constant torque on the stability are proposed by means of the eigenvalue theory of real linear systems.

以两端简支的单圆盘转子为对象，利用非线性振动理论的多尺度方法，研究了简谐扭矩作用下具有时变参数激励系统的近似解，指出系统出现不稳定组合式共振的可能性并给出了定常扭矩、简谐扭矩、外阻尼对不稳定区域边界条件的影响。

Transmitted torque by a disk-shaped magnetorheological actuator was deduced and analysed from the view-point of hydrodynamics. Hence then the actuator dynamic characteristics and viscous power loss relations with the actuator were discussed.

从流体力学的角度推导和分析了圆盘式磁流变传动机构的力矩，并以此为基础讨论了机构的动态品质、功率损耗等与机构的关系。

Under the universal equation of double-concave disc-shaped bubble, the analytical solution has been deduced. It confirmed theoretically that ethanol can lead to the larger volume of red blood cells. The fluorescence experiment result verified this conclusion.

通过建立双凹圆盘形膜泡的普适方程，得到了解析解，从理论上证实了乙醇作用能引起红细胞体积变大的可能性，并利用荧光分析技术证实了这一结论。

Before conducting the study, students believed that Heat could not influence gas and liquid volume.Matter didn't have thermal expansion. Metal ring's diameter will shrink after heating. The melting quantity of salt is much quicker and faster than sugar in the same temperature or water. Only metals can conduct heat, but not wood, glass, plastics. The quantity of heat is by steam way disappearing.

一、学童对「物质与热」的迷思概念有：(1)「热对气体、液体体积不会有影响」的概念，(2)听过热胀冷缩的语词，但是对原因不明了，(3)金属双圆环加热后，内环孔的口径会变小，(4)同温度且等量水，盐的溶解量比糖多、也比糖快；(5)木材、塑胶、玻璃不会传热，金属才会传热；(6)以为热量是以水蒸气方式散失，(7)冷气机应安装在高处，冷房效果较佳；(8)误认为金属是良好的保温材质。

Why, when grandmother's tears fall upon the rose, and she is looking at it, the rose revives, and fills the room with its fragrance; the walls vanish as in a mist, and all around her is the glorious green wood, where in summer the sunlight streams through thick foliage; and grandmother, why she is young again, a charming maiden, fresh as a rose, with round, rosy cheeks, fair, bright ringlets, and a figure pretty and graceful; but the eyes, those mild, saintly eyes, are the same,- they have been left to grandmother.

这朵玫瑰张开了，于是整个房间就充满了香气。四面的墙都向下陷落，好像它们只不过是一层烟雾似的。她的周围出现了一片美丽的绿树林；阳光从树叶中间渗进来。这时祖母--嗯，她又变得年轻起来。她是一个美丽的小姑娘，长着一头金黄色的卷发，红红的圆脸庞，又好看，又秀气，任何玫瑰都没有她这样鲜艳。

There is the belief that things are busier on full-moon nights.

威尔斯这样说。&人们相信，就是因为月亮圆了，所以才会变忙的。&

The flat bottom and the right-angle rims of the mouth, the bottom and the ears form a pleasant contrast with the curves of the splay ears, the hoof-shaped feet, and the contracted belly, endowing the form of the cauldron with rhythm.

腹底由圆而变平，方折的口沿、底沿和耳沿，与外撇耳、蹄形足和内收的鼎腹等部位的圆弧线形成对比，刚柔相济，使得鼎的造型赋于节奏和韵律。

Cold before your voice took the piece of the night, Pierced by an arrow (I'm in your dream). Hesitation kills and the speed is cure, Feels like the moon is full and now we're chasing more.

在你的声音带走了夜晚的一部分时变冷，一箭穿心犹豫的杀并且速度是解药，就如同月亮是圆的并且现在我们追逐更多。

The split between the two groups can hardly be papered over.

这两个团体间的分歧难以掩饰。

This approach not only encourages a greater number of responses, but minimizes the likelihood of stale groupthink.

这种做法不仅鼓励了更多的反应，而且减少跟风的可能性。