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In this paper, a Si-doped armchaired single-walled carbon nanotube (7, 7) and a perfect SWCNT (7, 7) are investigated using the classical molecular dynamics simulations method. The inter-atomic short-range interaction is represented by empirical Tersoff bond order potential.

用分子动力学方法对扶手椅（7，7）单壁碳纳米管掺杂下的结构和力学性能进行了计算机模拟研究，在分子动力学模拟中，采用Tersoff 短程相互作用势描述原子间的相互作用。

Finally, after analysis of measuring the residual stress in autofrettage thick-walled tubes, the corresponding formulae and the formulae of measuring residual stress using Sachs method and X-ray method have been presented.

最后还对机械自紧厚壁圆筒残余应力测试技术进行了分析，给出了相应的公式和Sachs内膛削法X射线残余应力测定的计算公式。

The theoretical analysis methods on the first—order and second—order mechanical autofrettage technique of thick—walled cylinders, with reflecting the material characteristics, are studied systematically in this thesis.

本文首次提出和研究的厚壁圆筒二次机械自紧技术，可扩大机械自紧技术在不同口径身管上的应用，降低冲头的推力，充分挖掘现有设备的潜力。

This paper makes the optimum autofrettage analysis of thick-walled cylinder of the material with different yield strength in tension and compression base on the Mohr's yield criterion.

本文运用莫尔屈服准则对承受内压的拉压屈服强度不同材料的厚壁圆筒进行了自增强分析，得到了依赖于材料拉压比的厚壁圆筒的最佳弹塑性界面半径、最佳自增强内压。

Afterwards, the crash process of the thin-walled structure is simulated to find the effect of the cross section, the thickness and the pre-deformation on the crash capacity, and the axial impact deformation of the circinal tube is analyzed in the theoretical way, the axial impact deformation of the square tube and subulate tube are analyzed by simulation.

最后本文建立了原DF_(8B)机车车体正面碰撞刚性墙的仿真模型，在分析碰撞结果后，对原DF_(8B)机车车体的底架和司机室结构进行了改进；并利用薄壁圆管和锥形结构设计了吸能装置，利用凸凹相见的防爬板设计了防爬装置；对安装了吸能装置和做出结构改进的耐碰撞DF_(8B)机车以10m/s和15m/s速度正面撞击刚性墙进行仿真，结果表明碰撞时吸收装置先于车体主结构破坏，吸收碰撞能量，其吸能能力达到了国外有关标准的要求。

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With this fracture model, some important results are obtained for composite thin-walled circular tubes under axial compression; the calculation of the critical delaminate load is gained based on the linear elastic analysis As for the dynamic loading, this delaminated model modified in depth by introducing a dynamic factor will be helpful.

利用该模型本文得到一些重要的结论，并给出压缩载荷临界判据。利用该模型研究复合材料圆管的轴向压缩承载行为，为后继动力轴向压缩问题的研究奠定基础。

In eusporangiate ferns, the sporangia are thick-walled and develop from a number of cells.

在厚囊蕨中，孢子囊壁厚，由多个细胞发育而来。

In this dissertation, we purify,functionalize, and align the single-walled carbon nanotubes by Langmuir-Blodgett technique using compression-transfer method.

本文正是针对这一问题，对单壁碳纳米管进行了提纯、功能化，并利用LB技术的液面排布转移法实现了碳纳米管沿着轴向大面积定向排列。

In the paper, the collision of a single-walled carbon nanotube with two graphitic patches has been simulated by tight-binding molecular dynamics method.

本文主要采用紧束缚分子动力学方法对单壁碳纳米管与石墨片的碰撞进行模拟计算。

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。