空间运动

This paper introduces the concepts of space-bifurcation, direct motion, main saddle periodic orbit, and hybrid attractor.

引入了空间分叉、单向运动、主鞍周期轨道和混合吸引子等新概念。

Using the Poincare surface of section technique, an analysis of a particle motion in the phase plane has been presented.

借助Poincare截面技术，对粒子在相空间的运动进行数值分析。

Adjust the photogate height so the 1 centimeter row of the picket fence will pass through the photogate beam.

将带安装托架的光门放在轨道上合适的位置，使栅栏穿过它之前，小车有足够的空间开始运动。

The motions of plane and space curve have a wide range of applications.

平面和空间曲线的运动有着广泛的应用。

With the development of economy and advance of the level of urbanization,people have paid more and more attentions to every function of living space enviroment,and hope to release and resume their run-down body and mind in community activity.In particular, the children who like outdoor movements,have much more needs to contact with nature,play and communicate with others,and the childrent playland is their outdoor fairyland ,which satifies the needs of play and exercise to children.

随着经济的发展及城镇化水平的提高，人们越来越关注居住空间环境的各项功能，希望疲惫的身心在社区活动中得以释放和恢复，特别是喜好户外活动的少年儿童，极其需要更多地接触自然、结伴嬉戏和与人交流，儿童游戏场就是他们的户外乐园，承担着满足孩子们游乐和运动的需要。

For a series spatial and planar mechanism synthesis, synthetic equation set can be established according to the kinematics requirement and characters of the mechanism. Then trigonometric functions are rationalized so as to create a polynomial system =0 , and the polynomial solution=0 is obtained with synthetic elimination method.

对于平面机构与空间机构的各类综合问题，根据各种机构的运动综合要求和机构的特点，建立机构的综合方程组，然后通过三角函数的有理化，将综合方程组化成多项式方程组=0，并采用综合消元法求得其多项式解=0，进而求得待定的机构参数。

Proceeding from the general formula of the input torque of the spatial mechanism, a new method is advanced to decompose the position vector of the mass-center of the link, according to the characteristics of the adjacent coordinate axes of the mechanism.

本文运用对运动杆的质量和中心主转动惯量等效替代的原则，新提出了一种适用于以附加平衡重法对复杂的空间机构震动力矩公式进行优化平衡的简化方法。

An instantaneous optimal semi-active control method is put forward. Combined sliding mode control with lyapunov's stability theory, the control weights matrix, which can minimize structural instantaneous energy, is designed. Simulation and shaking table test is conducted to validated the method's effectiveness. To solve combination explosion of controlled structural state encountered in high-rise building control, the semi-active control strategy, which can drive structural state point to reach the sliding mode switching band, is designed by using sliding mode control theory, and genetic algorithm is used to find the optimal semi-active switching to drive the structural state point to sliding mode switching band at prestissimo speed.

提出了一种瞬时最优半主动结构控制方法，利用滑模变结构控制理论和Lyapunov稳定性理论设计使结构瞬时能量最小的半主动控制权矩阵，仿真实例和振动台试验验证了本文所提方法的有效性和实用性；为解决在高层建筑半主动控制中半主动控制器状态组合爆炸的问题，利用滑模变结构控制理论设计在Lapunov稳定意义下使结构在运动状态空间中任一相点于以最快速率到达滑模切换带的半主动控制策略，并用遗传算法找出了最快到达滑模切换带的半主动控制切换组合。

Then, the prior probability of the background and foreground is estimated with Baysian theory.

该算法利用贝叶斯模型结合核密度函数理论，把阈值的选取放到概率空间上考虑，给出了在复杂的动态背景下检测出运动目标的方法。

I hope that Singapore's public-minded intellectuals, with a global vision who will be playing an active role in academic pursuits, government and non-government affairs, mass media, business, religion and social activities, will help create greater scope for the development of the Chinese language.

希望将来新加坡具有全球视野的在学术、政府、媒体、企业、民间、宗教和社会运动中，扮演积极角色的公众知识分子，能为华语华文创造发展的空间。

Do you know, i need you to come back

你知道吗，我需要你回来

Yang yinshu、Wang xiangsheng、Li decang,The first discovery of haemaphysalis conicinna.

1〕 杨银书，王祥生，李德昌。安徽省首次发现嗜群血蜱。