碰撞

Plus neutrons, in the nucleus cloud chamber photograph, an unknown nucleus collides with a 44He nucleus, and after the collision tHe nucleus, and after the collision the two he two particles nuclei nuclei travel in perpendicular directions relative to each other.travel in perpendicular directions relative

如右图所示，在如右图所示，在44HeHe（左上角的数字为核子数，即在核子中的质子和中子数之和）云室照片中，一个未知核子与（左上角的数位为核子数，即在核子中的质子和中子数之和）云室照片中，一个未知核子与44HeHe核子碰撞，碰撞后两个核子以彼此垂直的方向运动。

On the basis of contact mechanics, the expression of restitution coefficient, which the elastic-plastic deformation of earth is considered, is presented in this paper.

利用接触力学弹塑性碰撞理论，推导了考虑了落石与地面碰撞弹塑性变形的恢复系数计算公式。

A formula of rebound distance based on coefficient of restitution was deduced through kinematic analysis of raw coal in the process of oblique-impact .

通过对斜碰撞过程中原煤球的运动分析，推导出基于碰撞恢复系数的物料块反弹距离公式。

The classical Hertz and JKR elastic contact theory is successfully applied to the plastic collision of cohesive particles. And the coefficient of restitution is then defined from the consideration of energy.

在经典Hertz弹性接触理论和JKR粘弹性接触理论的基础上，本文从理论上将其推广应用至粘附性颗粒塑性碰撞的情形，并从能量的角度定义了能够更加合理反映碰撞规律的弹性回复系数。

Statistic analysis result shows that the time step is the most important influence factor of simulation precision, and there is relation between simulation error and the setup value of restitution coefficient which the greater the setup value is, the less the simulation error is. Although there is no effect to the total contact time in the course of collision, the value of the time step decides the total contact step, and there is a logarithmic linear correlativity between them.

统计分析结果表明：计算时步是影响模拟精度最重要的因素；模拟误差还同恢复系数的设定值有关，设定值越大，模拟误差就越小；计算时步的大小虽然对碰撞过程的总接触时间影响不大，但是却决定了碰撞过程的总接触时步数，二者之间存在对数线性相关关系

Results show that the equivalent mass in normal direction depends on the modes of collision. In the case of reversed sliding and sticking, the coefficient of restitution varies as a result of the instantaneously changes of the equivalent mass during impacting process. The coefficient of restitution depends not only on the contact force, but also on the kinematical and dynamic parameters of the two rigid bodies. Moreover, a formula is proposed to calculate the coefficient of restitution.

指出法向等效质量依赖于碰撞状态，在反向滑动和停止滑动这两状态下的法向等效质量是变化的，因此导致其恢复系数是变化的，这样，恢复系数不仅与接触力有关，而且还与两刚体的运动和动力参数有关，同时给出各种碰撞状态下的恢复系数计算式。

Among 6 influential factors, only the feature of overburden and vegetation play an important role of controlling the restitution coefficient of rolling rock, which can be expressed by a linear relation.

斜坡覆盖层和植被特征对滚石碰撞恢复系数起控制性作用，其他因素几平无影响；斜坡覆盖层与植被特征和碰撞恢复系数之间可用线性关系描述。

Collision orogens ; Non-Wilson cycle ; Collis ion units ; Classification

碰撞造山带；非威尔逊旋回；碰撞单元；分类

Sengor(1992)proposed a triple classification, but it can not cover all collis ion orogenic belts.In this paper a new classification on basis of units that take part in the collision is put forward.

本文主要依据参与碰撞的单元，即板块、微板块、前缘弧、残留弧和增生弧，提出一个新的分类方案，即将碰撞造山带分为陆－陆，陆－前缘弧，陆－残留弧，陆－增生弧，弧－弧，陆－弧－陆6种类型。

Collision detection procedures, you will be able to understand that objects have the effect of collisions.

碰撞检测的程序，你可以从中了解到物体的碰撞产生的效果。

In the United States, chronic alcoholism and hepatitis C are the most common ones.

在美国，慢性酒精中毒，肝炎是最常见的。

If you have any questions, you can contact me anytime.

如果有任何问题，你可以随时联系我。