Methods one side of sciatic nerve of 60 sd rats was treated by small gaps briding ( experimental group ) , another side was treated by epineurial suture ( control group ) 方法：通过动物实验，对60只sd大鼠的一侧坐骨神经采用小间隙静脉桥接法吻合（实验组） ，另一侧用采用神经外膜吻合（对照组） ，观察神经修复效果。
This paper uses the program to calculate the dynamics performance of small slack coupler that designed by qiqiha ' er vehicle ( grounp ) company . by compared maximum coupler force and maximum acceleration of car body with common slack coupler at condition of train starting , braking , emergency braking and releasing , we verified that small slack coupler is better than common slack coupler in dynamics performance . this paper also calculated the train dynamics performance parameter with different buffer and braking system , running in different line and using different operating method 本文利用列车纵向动力学模拟程序，计算了齐齐哈尔车辆(集团)公司研制的13号小间隙防脱车钩的纵向动力学性能，通过比较各个车钩间隙下列车最大纵向车钩力和列车最大加速度的数值，得出小间隙车钩在列车启动工况、常用制动工况、紧急制动工况、缓解工况的纵向动力学性能都较原有车钩性能优异的结论。
The author advances that the shear connector is simulated by two spring elements , which are vertical to each other and parallel to the interface between steel and concrete , and one multipoint constraint element , mpc element , which is vertical to the interface . the author also puts forward that the crack of the deck is simulated by the gap element which ca n ' t support longitudinal tensile force but can support longitudinal compressive force 提出了以正交的两个平行于钢和混凝土界面的弹簧单元及一个垂直于界面的多点约束( mpc )单元来模拟剪力键，以小间隙接触( gap )单元来模拟混凝土桥面板的开裂，模型中忽略了混凝土板与钢梁接触面间由摩阻而产生的粘着力。
