重心

The results were as follows.(1) In the backward handspring, the trajectory of CM and horizontal velocity of CM in junior-high and college gymnasts were lower and higher than those of senior-high gymnast, so the vertical velocity is better when they perform tucked backward somersault. College gymnast has higher vertical velocity than junior-high and senior-high gymnasts in take-off moment of backward handspring phase.(2) Senior-high and college gymnasts have more elbow and shoulder angle in take-off moment of backward handspring and tucked backward somersault phase. Therefore, angle of both arm is bigger for performing in hand push away phase in the backward handspring, and increased the reaction force with body in the tucked backward handspring.(3) College gymnast has large knee flexions in hand support and push away moment in the backward handspring, it would increase rotation radius and better moments of inertia in the backward handspring.

结果显示：在后手翻阶段中，较低的重心轨迹和较高的水平速，有於后续空翻的垂直速；大专选手在后手翻阶段起跳瞬间有较高的垂直速；高中及大专选手在后手翻起跳脚地瞬间和团身后空翻起跳脚地瞬间时，肘、肩关节角皆大於国中选手，使其在后手翻起跳地瞬间时，双臂的伸展於后手翻的手推地面的动作，而团身后空翻起跳脚地时，双臂向上摆於身体向上伸展方向的掌握，并使重心有一定的腾空高；大专选手在后手翻阶段的手著地瞬间和手地瞬间的膝关节角较大於高中和国中选手，使其可增加身体的旋转半径，并能获得较佳的下摆动能，而膝关节角小则形成屈膝的动作，导致重心水平速低，减少下摆动能和影响整体动作的节奏和韵。

In the process of moving from single-sustenance to double- sustenance, the angel of body tends to enlarge; in the process of moving from double-sustenance to single-sustenance, the angle of body tends to decrease; when the right leg is kicking on the ice, the center of gravity is just moved to the upper point of fulcrum, which means the center of gravity is vertical to fulcrum, while the left leg starts to kick on the ice when center of gravity completely surpass fulcrum; right knife touches the front ice of the supporting foot, the left knife touches the interior and front ice; small momentum variation coefficient and good effect of momentum move show the rationality of action and abundance of

单支撑阶段向双支撑阶段过渡过程中，躯干角度有增大趋势；右双支撑阶段向单支撑阶段过渡过程中，躯干角度有下降趋势；右腿蹬冰时重心刚好前移至支点的正上方，即重心与支点相垂直，而左腿则是在重心完全超越支点后一段时间才开始的蹬冰；右刀着冰向支撑脚前方下刀，左刀着冰向内侧前方跨出；动量变异系数小，动量转移效果好，反映了动作结构的合理性和能量利用的充分性；目前世界优秀运动员各环节的动量分配比例较以前均有较大幅度的提高；环节动量变异系数遵循着大环节动量变异系数小、小环节动量变异系数大的原则是较合理的。

The stude announces that their changeable regular of the center of gravity level speed in supporting phase is falling in tne first cushioning phase. When their center of gravity's vertical lines pass their heels and their knee joints go on extended contraction ,their center of gravity level speed has extended .the reason is that their angles have passed the heels and their swinging legs' kenn joints have swinging the front of their bodies. Its power originates the swinging leg's forward active swinging and the decurtation contraction of hip joints 、ankles of the supporting legs.the swinging leg shows "the calf's active backward swinging"before its landing impact,the skill affects the loss of center of gravity level speed when the swinging leg lands.they enlarge their trunks' forward-landing impact phase ,it can decrease the center of gravity level speed's loss after landing and impel the center of gravity level speed to pass the supporting spot quickly.

两人缓冲阶段身体重心水平速度变化规律是在体前缓冲阶段呈下降趋势；当身体重心垂线超过脚后跟后，在膝关节继续缓冲做退让收缩的情况下身体重心水平速度开始加大，原因是踝关节在最大缓冲时身体重心已移过支撑面及摆动腿膝关节已做体前摆动，主要动力来源于摆动腿的积极前摆和支撑腿髋、踝关节的克制性收缩；在摆动腿下压着地前期是大腿积极下压小腿随大腿的积极下压顺势向前下滑摆，在摆动腿下压着地后期表现出"小腿积极回摆"技术，对减小着地时的水平速度损失、加大向前用力都有积极影响；适当加大摆动下压着地阶段躯干的前倾角度，有利于减少着地时相的速度损失和有利于身体重心较快的移过支撑点；缩小后蹬结束后的后伸动作幅度，有利于减小腾空时间。

In order to get the optimal nesting position, this paper proposed the concept of gravity center NFP.

为了在NFP中进一步得到优化的靠接位置，在NFP的基础上提出了重心NFP的概念，通过选择重心NFP中的最低重心位置来确定零件的排放位置。

Years ago, Softbank's investment focus in the United States, the focus of investment five years ago in Japan, and now the focus of investment in China.

10年前软银的投资重心在美国，5年前投资重心在日本，而现在的投资重心在中国。

This paper mainly studied the key technology of weight and centre of gravity accuracy control of offshore structures and floaters, developed structural design of weight and centre of gravity data base and realized its main function by using VB and ACESS. And the tolerance distribution calculation formula of weight and centre of gravity of offshore structures and floaters was worked out by utilizing dimension chain principle. The dynamic adjustment and control method of weight and centre of gravity tolerance during construction was raised.

文中重点研究海洋结构物空船的重量、重心精度控制技术的关键技术，开发了重量、重心数据库的结构设计，采用VB和ACESS实现了该数据库的主要功能；应用尺寸链原理推导了海洋结构物空船重量、重心公差分配计算公式；提出了在建造过程中进行重量、重心误差的动态调整控制方法。

This paper starts with the locus of barycentre, separates portrait and landscape of biped walking|chair robot by restrict z|coordinates of barycentre, and plan the gait based on the locus of barycentre, finally calculate the torque of joints of the supported leg with a simplified model to evaluate the correctness and rationality of gait planning.

从重心的轨迹入手，通过约束重心z向坐标实现载人两足步行机器人纵向与横向的分离，进而以重心的轨迹为基础，确定了机器人行走姿态，并通过简化模型计算支撑脚关节扭矩来评估步态规划的正确性与合理性。

Acetabula are outlined, and center of graity is at X. B, Center of graity, X, is anterior to S2 ertebra, although center of graity is not fixed and changes with moement of upper body with respect to pelis.

髋臼已标出，重心位于X点。B：重心X位于S2椎体前方，尽管重心并不固定，可随躯干相对于骨盆的运动发生改变。

The results showed that the differences of spatial changes between cultivated land and population in Shaanxi Province are significant. However, the change distribution pattern is basically identical. There is little relative change in southern Shaanxi, while it is volatile in northern Shaanxi and central Shaanxi plain. The cultivated land gravity moves 11. 67 km to northeast during the past 52 years, and the population gravity moves 17.35 km to northeast. The whole trends of them are alike and the distance between two canters of gravity pushes 6.29 km close.

结果显示，陕西省耕地和人口各自空间变化区域差异显著，但变化分布格局大致相同，陕南地区相对变化较小，陕北地区和关中地区中部部分区域相对变化较大。52年来耕地分布重心向东北方向移动11.67 km，人口分布重心向东北方向移动17.35 km，两者整体走势相似，两重心之间的距离推近了6.29 km。

Secondly,set up mathematical model for layout optimization and made a calculation by improved genetic algorithm to achieve COG optimization in the cross section of the aircraft,meanwhile minimized layout vessel.

首先分析了飞机总体布局方案设计阶段对重心控制的特殊要求；然后建立了布局优化的数学模型并采用改进的遗传算法进行求解，实现了飞机横截面内的重心优化，并最小化了布局空间；最后在Pro/E中建立布局仿真模型，利用搜索法实现飞机纵向重心的调节。

On the other hand, the more important thing is because the urban housing is a kind of heterogeneity products.

另一方面，更重要的是由于城市住房是一种异质性产品。

Climate histogram is the fall that collects place measure calm value, cent serves as cross axle for a few equal interval, the area that the frequency that the value appears according to place is accumulated and becomes will be determined inside each interval, discharge the graph that rise with post, also be called histogram.

气候直方图是将所收集的降水量测定值，分为几个相等的区间作为横轴，并将各区间内所测定值依所出现的次数累积而成的面积，用柱子排起来的图形，也叫做柱状图。