质点

A method of phase plane is used to investigate the movement of the spherical rolling robot before jumping and its jumping condition is developed.

然后利用相平面法对球形机器人弹跳前的运动进行了分析，得到了起跳条件；利用质点系的达朗伯原理得到了球形机器人弹跳后的动力学模型。

Therefore the disturbance of the phase velocity or meander amplitude could make the motion of the fluid particles chaotic.

弯曲急流的相速，振幅发生周期扰动均可使流体质点的运动出现混沌特性。

The PZT plates were polarized in thickness direction. By using the deformation in the plane perpendicular to the direction of polarization, the rotation around Z axis was generated when the torsional vibration around Z axis mode was excited. And the rotation around X axis or Y axis was generated by combining the longitudinal vibration mode and the bending vibtration mode.

利用压电陶瓷在垂直极化方向平面内的变形，激励定子绕Z轴的扭转振动模态，实现转子绕Z轴的转动；激励在定子中固有频率接近、振动方向相垂直的伸缩振动模态和弯曲振动模态，并通过振动的叠加使定子末端质点产生绕X轴或者Y轴的椭圆运动，实现转子绕水平轴的转动。

Adding minor Mn and Cr to Al-Mg-Si alloy can improve the tissue at as-cast treatment. The transformation of the platelike ?

含Mn、Cr相的弥散质点可阻止合金热挤压过程中的再结晶，得到纤维状组织，并促进细小时效强化相β′的析出，从而强化了合金。

The model of launch vehicle is rigidˉbody motion equati on. The model of stabilizing parachute is mass point motion equation.

其中运载火箭的数学模型是刚体运动模型，稳定伞的模型是质点模型，而伞绳的模型是弹簧阻尼系统模型。

It encapsulates the data that describes a basic vehicle with point mass.

他封装了一些可以用来描述质点物体运动的数据。

This may be the reason why, when we are interested in mass point configurations we like to define defects wit-h respect to perfect crystal structures.

由此，当我们对于质点排列的规律产生兴趣时，我们倾向于以完美的晶体结构为标准去定义缺陷。

A mass point imaged by neutron digital imaging system can be represented in terms of PSF.

中子数字成像系统，其对样品中一个质点的成像，可以采用点扩散函数加以描述，记为PSF。

Newton's law of motion as applied to the point mass is the well-known vector equation: F= ma .

牛顿运动定律应用于质点时就得到这样一个著名的向量方程式：F＝ma。

The outside sea wave streams into near the shore and shallow water area, being subjected to a submarine friction function, the wave 锋 becomes abrupt, the trough of wave become slowly, the fluid matter orders sport track to present back and forth fluxion, and to shore enter the current velocity degree is usually bigger than offshore reflux speed, causing bottom sediment clean to shore porterage, and is aroused a shore wave of ascend the blunt water current take to the seashore on-line pile up.

外海波浪传入近岸浅水区，受到海底的摩擦作用，波锋变陡、波谷变缓，水质点运动轨迹呈现往复流动，而且向岸进流速度通常大于离岸回流速度，导致底部泥沙净向岸搬运，并被激岸浪的上冲水流带至海滨线上堆积。

Cynanchum Lingtai apricot production in the average weight 65 grams, the brightly-colored fruit, juicy rich, sweet-sour taste, sweet from the nucleolus, when the late Qing Dynasty famous Shaanxi, Gansu provinces, the Qing imperial court Tongzhi tribute for years.

灵台生产的牛心杏平均单果重65克，果实色泽鲜艳，汁多味浓，甜酸适口，离核仁甜，清末时就驰名陕、甘两省，清同治年间曾为朝廷贡品。

Chenopodium album,Solanum nigrum, and Amaranthus retroflexus were very susceptible to the herbicides. Polygonum persicaria and Abutilon theophrasti were relatively less susceptible to the herbicides, and Lycopersicon esculentum was not susceptible to it. The relationship between reduction rates of weed biomass and PPM values of weed leaves 2,4, and 6 days after treatment was established.

供试的6种杂草对该混剂的敏感性存在显著差异：红心藜Chenopodium album、龙葵Solanum nigrum和反枝苋Amaranthus retroflexus对该混剂最敏感，ED90值分别为47.65、71.67和29.17g/hm2；春蓼Polygonum persicaria和苘麻Abutilon theophrasti敏感，ED90值分别为96.91、114.20g/hm2；而番茄不敏感。