impacted fracture

Conclusion Fixation of distal femoral fractures with a retrograde intramedullary screwing nail is new effecting methods, with simply the operation and fastness fixation, little impacted on fracture.

结论股骨旋入针逆行穿针固定治疗股骨下段骨折，手术操作简单，固定牢固，对骨折端的血运影响小，是一种新的有效的治疗方法。

The main work of the thesis and achievement are summed up as follows: ( 1) Research on meso-structure of fractured porous media, the mathematical model of fractured porous media is established and the four main factors were found which impacted fracture porous media fluid flow.

论文主要工作和成果归纳如下：（1）通过对裂隙-孔隙介质细观结构的研究，找出了影响裂隙-孔隙介质内流体流动的四个主要因素，建立了裂隙-孔隙介质研究的数学模型。

Temperature impacted on the fracture stress and elastic modulus of the material obviously. Elevated temperature will lead to low fracture stress and smaller elastic modulus.

温度对断裂应力和弹性模量的影响也比较明显，高温会导致低的断裂应力和小的弹性模量。