反向运动的

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。

An elliptic rotating field is produced when an induction motor operates in asymmetry, this paper proposes a model of jointed motion to describe the motion of an elliptic rotating vector and states that the elliptic rotating vector is jointed with two components, the main one rotates forward at a uniform speed while the adjunctive one jointed at the topend of the main one rotates backward around the joint point at a double speed, both make the elliptic rotating vector rotate at swinging amplitude, speed and direction.

感应电机不对称运转时产生椭圆旋转磁场，本文建立了描述椭圆旋转矢量的接合运动模式，说明椭圆旋转矢量是由一个主矢量带动一个付矢量一起旋转构成的接合矢量，主矢量以匀速旋转，付矢量链接在主矢量顶端同时绕着链接点相对主矢量以二倍速反向旋转，两者共同构成的一个单向椭圆旋转矢量。

CAS is currently rely mainly on the diagnosis of coronary provocation test, including acetylcholine and ergonovine test pilot, domestic scholars have found in 201Tl SPECT myocardial perfusion imaging in the cardiac stress test was reverse redistribution is CAS One of the characteristics of patients, if the combination of exercise electrocardiography test negative as well as the rest of the clinical features of chest pain, diagnosis of coronary artery spasm highest sensitivity and can be made respectively 98% and 90% respectively.

目前诊断CAS主要依靠冠状动脉内激发试验，包括乙酰胆碱试验与麦角新碱试验，国内学者发现在201TlSPECT心肌灌注显像心脏负荷试验中呈反向再分布现象是CAS患者的特点之一，若结合运动心电图试验阴性以及静息性胸痛的临床特点，诊断冠冠状动脉痉挛的灵敏度以及特意度分别可以达到98％和90％。

Firstly, several kinds of schemes were proposed according to the design demand. The best scheme was chosen after analyzing and comparing the schemes. The robot's structure was designed with Pro/Engineer and AutoCAD software. Secondly, the kinematics analysis conducted, coordinate transformation matrix using D-H method was set up, and the kinematics equation direct solution and inverse solution was deduced. The manipulative interface about the kinematics equation direct solution and inverse solution was completed with VC++ and the velocity Jacobian of displacement matrix was constructed using differential transform method. In the process of the trajectory planning based on robot's kinematics analysis, I propone a method by which we can get middle nodal point with normalizing factor in order to simplify our searching for these middle nodal points. In addition, I give these middle nodal points with actual physics signification. For eliminating contradiction between real-time and accuracy, I bring forward separately limit of error and reversal interpolation method. For decreasing calculation quantity, we resort to tri-spline interpolation in the articulation space.We analyse the work range of the robot by resorting to graphic means.

首先，作者针对机器人的设计要求提出了多个方案，对其进行分析比较后，选择其中最优的方案后用Pro/Engineer和AutoCAD软件进行了机器人模型结构设计；其次，进行了运动学分析，用D-H方法建立了坐标变换矩阵，推算了运动方程的正、逆解，运用VC++制作了正、逆运动学求解的求解界面；并且用微分变换法推导了速度雅可比矩阵；在基于机器人的运动学的轨迹规划中，通过在操作空间的规划，提出了归一化因子来求解中间结点，通过它可以使求解中间结点变得更简单，并且赋予这些中间结点实际的物理含义，对于规划中精确性和实时性的矛盾，提出了以误差极限法和反向插值法来解决的方法；为了减少规划过程中计算量，在关节空间进行三次样条插值；然后借助图解法进行工作空间分析，作出了实际工作空间的轴剖图。

It is shown that under the action of the shock, the region I current moves towards the midnight, accompanied by a successive occurrence of two FAC structures: an anomalous FAC pair of opposite direction to the region I current and a new region I current of the same direction.

模拟结果表明，在激波的作用下，电离层Ⅰ区电流系统向子夜方向运动，在向阳侧相继出现与原Ⅰ区电流反向的异常场向电流对和同向的新生Ⅰ区电流对。

There are dilated small-bowel loops showing active peristalsis. The peristalsis is usually pendular, with to-and-fro movement of fluid on the lumen. This is because of reverse peristalsis occurring due to distal obstruction.

扩张的小肠肠管存在蠕动活跃，蠕动通常呈摆动状，肠管内的液体内容物来回运动，这是由于远端的肠管梗阻而导致的反向蠕动。

When the large rotating arm rotates, the transmission gear is driven to rotate around the fixed gear to rotate the planetary gear, which drives in turn the small rotating arm to rotate in the direction opposite to the large rotating arm, so that the shaft of the small rotating arm reciprocates across the rotation center of the large rotating arm.

当大旋臂旋转时，传动齿轮受到驱动沿固定齿轮周转并带动卫星齿轮转动，卫星齿轮带动小旋臂作与大旋臂反向的旋转，从而使小旋臂上的固定轴随着大、小旋臂的旋转不断往复越过大旋臂的旋心作直线运动。

When a motor rotates, a ball feed screw pair converses positive and reverse rotation into advance and recession of the cap nut, thus the rotation directions of the motor can be directly and clearly identified.

电机转动时，滚珠丝杠副将正、反向旋转运动转化为螺母的前进和后退，故可快速直观地判断电机高速运行时的转动方向。

Chrysanthemum of 10 thousand birthday is lax to edaphic requirement, with the arenaceous qualitative loam with fecund, good drainage had better.

万寿菊对土壤要求不严，以肥沃。排水良好的砂质壤土为好。

He unstepped the mast and furled the sail and tied it.

他拔下桅杆，把帆卷起，系住。