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The main results of the investigation are as following:(1) Some important criteria for the design of multi-layer structure are acquired: the ratio of the layer thickness to the contact diameter should be controlled to a value about 0.8; increasing the number of the gradient layers and elasticity modulus of the top layer would benefit to the yield strength and the stress status at the interface.（2）By means of molecular dynamics simulations for a indentation and sliding process, it is discovered that dislocations of 45 direction to the surface occur in the surfaces layer, which is correspond to the direction of the plastic flows observed in the macroscopic continuous medium. The irreversible deformation caused by the dislocation and the atom piles at the surface are responsible for the irreversibility of the force response. They are also the main factors for the friction generation. The temperature and the indentation velocity have significant effects on the deformation behaviors of the material of the surface layer. The yield strength would increase obviously if the indentation velocity is greater than 10 m/s.（3）A method to evaluate the fracture toughness of coating by estimating the crack-density functionβof a Wicker''s indentation was proposed. Meanwhile a new surface treatment technology was developed using non-equilibrium plasma.（4）A MD-FE hybrid method and corresponding software was developed to analysis the tribological behaviors for multiplayer system.

研究主要内容和结果有：（1）得到指导梯度膜设计的几个准则：控制膜层厚度与接触半径比在0.8左右为宜；适当增加梯度层层数和顶层弹性模量，有利于提高抗屈服能力和改善界面处的应力状态；（2）通过对嵌入和滑动摩擦过程的分子动力学模拟，发现表层产生一个与宏观连续介质的塑性流动方向观测一致的45 方向位错；位错造成的不可逆变形和表面的原子堆积，是力的响应不可逆性的原因，也是构成摩擦力的主要因素；温度和嵌入速度对材料变形特性有显著的影响，当嵌入速度大于10 m/s时，屈服强度明显增加；（3）提出压痕裂纹密度系数β半定量判定膜层断裂韧性的方法；并开发出表面强化新工艺；（4）开发出分析表面摩擦学特性的MD-FE复合模拟方法和相应模拟软件。

You may be wrong, of course, but a risk of error is no excuse for inaction.

当然，你可能会犯错，但犯错的风险不是不行动的借口。

You may be wrong, ofcourse, but a risk of error is no excuse for inaction.

当然，你可能会犯错，但犯错的风险不是不行动的借口。

You may be wrong, of course, 8ttt8.com a risk of error is no excuse for inaction.

当然，你可能 www.ssBBww.cOm 会犯错，但犯错的风险不是不行动的借口。

It's a ind of helplessness to meet the wrong peson in the wrong time

在错的时间，遇见错的人，是一种无奈

Those who believe Europe is weak and ineffectual are wrong.

星期日商业新闻》如果你认为欧洲很脆弱又没什么本事的话，那你就大错特错了。

Indeed, it is interesting that in more recent works Unger (1984; 1986) has toned down his commitment to infallibilism in favor of a different conception of the skeptical debate which argues that there is nothing to tell between the contextualist reading of our epistemic concepts and what he calls "invariantism," which would license infallibilist conclusions.

事实上，有趣的是，最近 Unger (1984； 1986)减弱了其对不可错论的强调，而更倾向于在怀疑论争论中的另一个想法，是说：在这里没有东西可用以区别'对知道概念做出语境论解读'和'倾向于导致不可错论结论的不变论『invariantism』'。

Initial plan error is compounded by carelessness in carrying the plan out.

计划原来就有错误，再加上执行中的粗心大意使得计划错上加错。

Initial plan error is compounded by carelessness in carry the plan out.

计划原来就有错误，再加上执行中的粗心大意使得计划错上加错。

The high value of Poisson s ratio and low value of elastic anisotropy ratio imply that the interatomic force in ZrCr_2 is weakly directi...

并计算了层错与位错的弹性交互作用。对ZrCr2Laves相的力学特性和变形机制进行了讨论。

According to the clear water experiment, aeration performance of the new equipment is good with high total oxygen transfer coefficient and oxygen utilization ratio.

曝气设备的动力效率在叶轮转速为120rpm～150rpm时取得最大值，此时氧利用率和充氧能力也具有较高值。

The environmental stability of that world - including its crushing pressures and icy darkness - means that some of its most famous inhabitants have survived for eons as evolutionary throwbacks, their bodies undergoing little change.

稳定的海底环境─包括能把人压扁的压力和冰冷的黑暗─意谓海底某些最知名的栖居生物已以演化返祖的样态活了万世，形体几无变化。