中英文摘要

中英文摘要（共6篇）

篇1：中英文摘要

中英文摘要

作者姓名：段小洁

论文题目：单壁碳纳米管的AFM操纵、形变及相关拉曼光谱研究

作者简介：段小洁，女，1980年2月出生，2002年9月师从于北京大学刘忠范教授，于2007年7月获博士学位。

中文摘要

对形变碳纳米管（CNTs）的研究，包括研究其在应力存在下的结构演化、应力对其各种光电性质及电子能带结构的影响等，不仅对CNTs在复合材料、纳电子和纳机电器件、以及应力传感器等中的应用具有重要意义，还对相关理论的发展有巨大推动作用。本论文发展了对表面上单壁碳纳米管（SWNTs）的原子力显微术（AFM）可控操纵方法，基于此AFM可控操纵，研究了CNTs在弯曲形变下的屈曲行为，以及SWNTs在扭转和拉伸两种形变下的共振Raman光谱特征。主要成果包括：

1.发展了对表面上SWNT的AFM可控操纵方法；

通过对操纵过程中针尖运动路径的合理设置、SWNT上操纵位置和针尖下压距离的选择，可以向SWNT中引入各种类型的应力。SWNT中产生的应力由其和基底间的相互作用力保持。发展了基于Si的AFM氧化的SWNT纳米焊接术，以增加AFM操纵的可控性。当对表面有SWNT的基底Si进行AFM氧化时，新生成的SiOx会对SWNT进行包覆，从而可以将SWNT在氧化点有

效的固定到基底表面。而且SWNT的存在会对Si基底的AFM氧化有明显的增强作用，相同条件下，表面有SWNT的Si氧化后产生的SiOx，比没有SWNT时更多，这种增强作用有利于对

SWNT的焊接固定。焊接的强度可以通过改变氧化偏压、针尖运动速率（氧化时间）等进行调节，提高氧化偏压、降低针尖移动速率有利于增强纳米焊接的强度。空气中热氧化实验和拉曼光谱的表征均证明，此焊接过程对SWNT的化学结构无明显影响。在某些点对SWNT进行焊接固定后，AFM操纵引入的形变的大小和分布可以被有效地控制，从而大大增加AFM操纵的可控性。

采用更强的AFM氧化条件，可以实现SWNT和Si的同时氧化，从而可以在任意位点对SWNT进行切割。结合AFM纳米切割、焊接和操纵等操作，可以构筑各种复杂形状的SWNTs，体现

了AFM作为纳米工具箱的作用。

2.研究了CNTs在弯曲形变下的屈曲行为；

通过选择合适的操纵位点、被操纵的CNT片段长度、操纵路径并优化针尖下压距离，可以严格控制弯曲CNT的角度，这样通过AFM操纵对同一CNT的可控弯曲，获得了一系列弯曲角度逐渐增大的CNT。CNT被操纵以后，与基底相互作用力会有明显减小，这使得CNT的有效弯曲区域，位于与基底只有vdW相互作用的被操纵部分，在AFM表征下表现为固定部分和被操纵部分的交点。有效弯曲部分与基底间仅有vdW相互作用，其长度在整个弯曲过程中几乎保持不变。

通过记录弯曲“点”在弯曲角度逐渐增大过程中的高度变化，研究了CNTs在弯曲形变下的结构演化和屈曲行为。发现不同CNTs在弯曲过程中，表现出“突变”和“渐变”两种屈曲模式，分别对应于弯曲“点”高度的突跃、均匀弯曲向屈曲结构的直接转化，和弯曲“点”高度的逐渐增大、均匀弯曲向屈曲结构的逐渐转化。“渐变”屈曲导致一系列屈曲过渡态的出现。“突变”多发生于小直径管，而“渐变”更常见于大直径管。通过对CNTs的层数和厚度等的估算，发现一般情况下，“渐变”屈曲模式的CNTs比“突变”模式的CNTs具有更大的厚度直径比。对“突变”屈曲模式的CNTs，临界屈曲角度随CNTs直径的增大而减小。

分子动力学模拟发现，（1）所研究的CNTs中，SWNTs均为“突变”屈曲模式，而双壁和三壁管均采取“渐变”屈曲模式；（2）“渐变”屈曲过程对应弯曲角度逐渐增大时，多壁管从最外层到最内层的逐渐屈曲，和各管层屈曲程度的逐渐增加，这是由其多层结构导致的各层壁屈曲行为的不同步，和管壁间vdW相互作用对屈曲的阻碍造成的，这说明MWNTs的多层结构是导致其“渐变”屈曲的主要原因；（3）基底的vdW相互作用对CNTs的屈曲行为没有明显影响。从导致两种屈曲模式的机理考虑，除直径外，CNTs的层数对其屈曲行为也有重要影响，这预示了在CNTs的力学性质中，存在不同于传统尺寸效应的双尺寸效应，即直径和层数共同决定CNTs力学行为。

本工作利用AFM可控操纵，在实验上几乎全程观察了CNTs在弯曲过程中的结构演化和屈曲形成过程，其所揭示的两种屈曲模式的形成规律，不仅对大量存在的CNTs形变的理论工作提供了支持和参考，一定程度上填补了实验上的空白，还对CNTs在复合材料、纳电子和纳机电器件、以及应力传感器等中的应用具有重要意义，3.研究了扭转和拉伸形变下单根SWNTs的共振Raman光谱行为；

AFM操纵可以向超长SWNT中同时引入扭转和拉伸应力，由于拉伸形变比扭转形变的传输距离更远，在操纵点附近扭转和拉伸两种形变同时存在，距离操纵点较远的区域，只有纯拉

伸形变存在。扭转形变的产生证明了SWNT在AFM操纵下滚动的发生。

扭转和拉伸形变都会导致SWNTs拉曼模振动频率的变化。研究发现：（1）扭转形变下，RBM变大，位于～1600 cm-1的G+(E2(g))模振动频率发生较大的红移，而其他在1590 cm-1～1560

cm-1范围内的大部分G模会发生轻微的蓝移，振动频率发生红移的G模的位移量，一般远远大于发生蓝移的G模的位移量；（2）拉伸形变下，RBM和G+(E2(g))模振动频率不变，而在1590 cm-1～

1560 cm-1范围内的大部分G模会发生明显的红移。（3）不同Raman活性模对形变的敏感度不同，扭转形变下，RBM、位于～1600 cm-1的G+(E2(g))模比其他G模更敏感，而在拉伸形变下，其他G模却具有更高的敏感度。这与形变导致的发生变化的C-C键是否与各模的原子位移模式相关联有关；（4）通过对SWNTs中形变量大小和Raman频率对形变变化率d/d地计算，发现RBM振动频率对扭转形变的变化率d(RBM)/dt，随SWNTs手性角的增大几乎线性增大。

某些SWNTs中，扭转形变导致的对称性破缺还会导致Raman模的分裂或新模的出现。按照预测，这种分裂或新模的出现最可能发生在锯齿形和椅形SWNTs中。扭转和拉伸形变都会导致SWNTs共振拉曼振动模强度的变化，这体现了形变对SWNTs电子跃迁能Eii的影响。根据

共振拉曼理论和RBM峰的IAS/IS，可以计算扭转和拉伸形变对Eii影响的方向和大小。

应力对SWNTs共振Raman光谱的影响一直是人们关注的重要问题，本工作首次在实验上研究了扭转形变下SWNTs共振Raman振动频率和强度的变化。利用AFM操纵在单根SWNTs水平上的研究，可以排除不同直径和手性带来的平均效应，从而有利于揭示SWNTs的本征性质。对拉伸和扭转形变在同根SWNT中的比较，也为理解不同应力对SWNTs拉曼影响的不同提供了有利条件。

4.AFM操纵引入的应力沿SWNT管轴分布的分析和调控，及SWNTs相关力学性质的比较；分析了超长SWNT中，AFM操纵引入的应力的传输和分布，由于SWNT与基底间摩擦力的存在和AFM操纵后应力的部分驰豫，扭转和拉伸应力沿SWNT管轴都呈“”形分布，应力分布的各特征量，如应力的最远传输距离、最大应力点的位置和最大应力值、应力线性分布的斜率等，决定于AFM针尖施加到SWNT的力的大小、SWNT的剪切模量或弹性模量、以及SWNT与基底间摩擦力的大小；通过控制AFM操纵和采用图案化基底，对SWNT中应力的大小及分布进行了调控；通过比较不同SWNTs的应力分布特征量，在单根SWNT水平上，研究比较了它们的各力学参量，如剪切模量、杨氏模量，以及与基底间摩擦力的相对大小。各力学参量对SWNTs的直径无单调关系，说明了SWNTs手性对力学性质的影响。

关键词：单壁碳纳米管，AFM操纵与加工，形变，屈曲，共振拉曼光谱

AFM Manipulation, Deformation and Related Raman Spectroscopy of

Single-Wall Carbon Nanotubes

Duan Xiaojie

ABSTRACT

The study on deformed carbon nanotubes(CNTs), including the study of their structure evolution and properties change under strain, is important not only for the application of CNTs in composite materials, strain sensors, nanoelectronic and nanoelectromechanical devices, but also for the development of related theory.In this thesis, we have developed controlled atomic force microscopy(AFM)manipulation techniques for single-wall carbon nanotubes(SWNTs)on surfaces.Using this controlled AFM manipulation, the buckling behavior of CNTs under bending, and resonance Raman spectroscopy of SWNTs under torsional and uniaxial strains, have been studied.The main results are listed as followings:

1.Controlled AFM manipulation techniques for SWNTs on surfaces have been developed By defining proper tip path, manipulation position on SWNT, and choosing optimal tip pressing distance, different kinds of deformation can be induced into SWNT.The deformation is stabilized by the interaction between SWNTs and substrate.To get controlled AFM manipulation, a new kind of nanofabrication---nano-welding has been invented based on the AFM oxidation of Si substrate.When the Si substrate with SWNT on top of it is oxidized by the AFM tip, the newly formed SiOx will grow around the tube, effectively fixing that site of SWNT onto the Si substrate.The existence of SWNT can enhance the oxidation of Si.With same oxidation condition, more SiOx can be produced with the presence of SWNT than the case where there is no SWNT.This is helpful for the fixing.The intensity of the welding can be modulated by changing the oxidation voltage and the tip moving speed.With higher voltage and slower tip moving, stronger welding can be obtained.From the thermal oxidation of SWNTs in air and the Raman characterization, it was found that this nano-welding has no obvious influence on the chemical structure of SWNTs.Together with this nano-welding, the magnitude and distribution of strain induced into SWNT by AFM manipulation can be well controlled.Both SWNT and Si can be oxidized when using stronger oxidation condition(much higher voltage and lower tip moving speed), thus the SWNT can be cut at well defined position.Combining this AFM cutting, nano-welding and manipulation, complex SWNT-based structures can be constructed, proved the function of AFM as a nano-toolbox.2.The buckling behavior of CNTs under bending has been studied

By choosing proper manipulation site on SWNT, the length of the fragment which is being manipulated, manipulation path, and optimal tip pressing distance, the angle can be well controlled when SWNT is bent by AFM manipulation.Based on this controlled bent of CNT by AFM manipulation, A CNT with a series of different bending angles has been obtained.The interaction between manipulated SWNT fragment and substrate is largely decreased after the manipulation.And the effective bending region is located at the fragment where Only vdW interaction exists between it and the substrate.It appears as the cross point between the fixed SWNT part and

manipulated SWNT part in the AFM image.Only vdW force exists between the effective bending region and substrate, and its length keeps constant when changing the bending angle.Through recording the height change at the effective bending region when changing the bending angle gradually, The structural evolution and buckling behavior has been investigated under the bending.Two distinct „abrupt‟ and „gradual‟ buckling modes have been revealed in different CNTs.For the „abrupt‟ buckling mode, the height of the bending „point‟ has a sudden increase, and an abrupt transition from the uniform bending to buckling happens.While the „gradual‟ mode corresponds to a gradual increase of the height at the bending „point‟, with a gradual transition from uniform bending to buckling.The „gradual‟ buckling results in a series of buckling intermediate formation.„Abrupt‟ buckling mode is mostly found for small diameter CNTs, while for large diameter CNTs, the „gradual‟ mode is more common.Through the estimation of the wall numbers and thickness of CNTs, it was found that the CNTs with „abrupt‟ buckling mode has smaller thickness diameter ratio than the CNTs with „gradual‟ buckling mode.The critical buckling angle decreases with the increase of CNT diameter for the „abrupt‟ buckling mode.The buckling behavior has also been investigated by molecular dynamics(MD)simulations.It was found:(1)for all the CNTs studied, the SWNTs have “abrupt” buckling mode, and double and three walled CNTs take “gradual” buckling modes;(2)the “gradual” buckling corresponded to the process that different tube walls of MWNTs buckled at different bending stages, and the buckling degree of individual tube walls gradually increased along with the bending strain increase.This is caused by the unsynchronization of the buckling for different walls caused by the multi-shell character, and the retarding of buckling by the inter-wall vdW force.The study on the formation of the two buckling modes found that the multi-shell structure of MWNTs accounts for the “gradual” buckling modes;(3)The MD studies also proved that the vdW interaction with substrate has no remarkable effect on CNTs buckling behavior.The study on the buckling mechanism suggests that except for the diameter, the wall number also determines the buckling behavior.This means for the mechanical properties of CNTs, a special “dual-size” effect may exists, that is, both the size and the thickness determine the CNTs mechanical behavior.By using controlled AFM manipulation, the work here observed the structural evolution and buckling formation almost in the whole bending process.The founding about the two buckling modes, not only provides support and reference for the relevant theoretical study, fills the gap between theory and experiment, but also is important for the application of CNTs in composite materials, nanoelectronics and NEMs, and strain sensors.3.The resonance Raman spectroscopy of individual SWNTs under torsional and uniaxial

strain has been investigated

The AFM manipulation can induce both torsional and uniaxial strains into the ultra-long straight SWNTs.Because the longer propagation distance of uniaxial strain than the torsional strain, only pure uniaxial strain exists at region far from the manipulation point.While at region close to the manipulation sites, both the two strains happen.The formation of torsional strain suggested the rolling of SWNT under the present AFM manipulation.Both uniaxial and torsional strain can change the Raman vibrational frequency.It was found that:

(1)the RBM and G-band spectra responded differently to the two types of strains.Under torsional strain, RBM frequency RBM was found to upshift and one of the modes assigned to E2 symmetry in the G+ band, which occurs at ~1600 cm-1(G+(E2(g))), downshifted significantly, whereas the rest G

modes located in the range of 1590 cm-1～1560 cm-1 are slightly upshifted.The redshift of the(G+(E2(g)), ismuch larger that the buleshift of other G modes;(2)Under uniaxial strain, RBM and G+(E2(g))do not have noticeable response and the rest of the G modes in the range of 1590 cm-1～1560 cm-1 are downshifted.(3)Different Raman modes have different sensitivity to both strains.RBM and G+(E2(g))is more sensitive to torsion than other G modes.Whereas under uniaxial strain, other G modes have larger sensitivity than RBM and G+(E2(g)).This is related to the correlation between the C-C bond change and the atom vibrational displacement of different modes;(4)The

calculation on the strain magnitude and frequency shift of Raman modes per strains d/d found that, under torsional strain, d(RBM)/dt nearly linearly increased along with the increase of the tube chirality angle.G-band was found to split into multiple sub-bands in some cases, presumably due to broken symmetry induced by torsion.This splitting is most likely found in zig-zag and armchair SWNTs.Both the uniaxial and torsional strains can change the intensity of resonant Raman peaks.This is originated from the influence of strains on electronic tranision energy Eii.From this change, the

modulation direction and magnitude of strains on the electronic transition energy of SWNTs can be calculated.The influence of strain on the resonant Raman spectra of SWNTs has drawn much attention recently.The work here firstly experimentally studied the torsional strain effect on resonant Raman spectra of SWNTs.And the study in the single SWNT scale by AFM manipulation can exclude the average effect originated from different diameter and chiraligy.This helps to reveal the intrinsic property of SWNts.The comparison of uniaxial and torsional strain for same SWNT, also benefit the understanding of the influence of different strains on SWNTs.4.The analysis and modulation of strain distribution along SWNTs axis, and the comparison

of related mechanical parameters of different SWNTs

It was found that after AFM manipulation, both the torsional and uniaxial strain would have a “” shaped distribution along the SWNT axis, due to the friction between SWNTs and the substrate, and the partial relaxation of strain.The characteristics of the distribution, including the propagation distance of strain, the maximum strain and its position, and the slope of the strain distribution, are determined by the force exerted on SWNT by AFM tip, the elasticity modulus E and the shear modulus G, and the friction between SWNT and surface.By controlling the AFM manipulation and using patterned substrate with different components, the magnitude and distribution of strain in SWNT has been modulated.With the comparison of strain distribution in different SWNTs, their mechanical properties, such as E and G, and the friction with the substrate have been compared, on the single SWNTs scale.It was found that there is no monomial relationship between these parameters and the SWNTs diameter, this suggests that the chirality of SWNTs also has important effect on SWNTs mechanical properties.Key words:Single-Walled Carbon Nanotubes(SWNTs), AFM manipulation and fabrication, deformation(strain), buckling, resonance Raman spectroscopy

篇2：中英文摘要

随着石油工业的快速发展，压力储罐越来越受到人们重视。它是在石油化学工业、能源工业、科研和军工等国民经济的各个部门都起着重要作用的设备。而二氧化碳储罐的发展，更为让人们关注。二氧化碳压力储罐一般由筒体、封头、法兰、密封元件、开孔和接管、支座等六大部分构成容器本体。此外，还配有安全装置、表计及完成不同生产工艺作用的内件。压力容器于密封、承压及介质等原因，容易发生爆炸、燃烧起火而危及人员、设备和财产的安全及污染环境的事故。目前，世界各国均将其列为重要的监检。所以设计者应该本着严格扶着人的态度对待每一次设计。保障自己及他人的安全。

1174326778 2013/7/16 10:59:40

实习心得 在6月29号到7月18号这段日子里，装备三个班分两组每组四天半到金属结构厂参观学习，在校期间，通过录像学习和小组讨论，同学们认真完成实习报告。在本次实习过程中，金属结构厂为同学们展现了许多活生生的知识，是书本所不能给与的。同学们看到了巨大的罐体，椭圆风头及球罐的制作过程，看到了手工焊埋弧焊及气体保护焊机器及工人操作，参观了无损检测车间，看到了本学期刚刚学过的射线检测，磁粉检测以及当前流行的TOFD等无损检测方法。通过分组讨论及学习，使同学们进一步提高团结协作的能力，并在小组中追求提高自身素质，总而言之，我相信本次实习，使每一位同学获益非浅，感谢学校及老师给我们的这次实习机会。

Abstract

篇3：关于中英文摘要的书写要求

摘要是以提供文献内容梗概为目的, 不加评论的解释, 简明确切地记述文献重要内容的短文。摘要应具有自明性和独立性, 并拥有与一次文献同等量的主要信息。即不阅读全文就能获得必要的信息。通常中文摘要以不超过400字为宜。应以第三人称的语气书写。不要使用“本文”“作者”“我们”等作为陈述的主语。

摘要一律采用四要素式, 即:①目的 (objective) :简要说明研究的目的, 说明提出问题的缘由, 表明研究的范围和重要性。②方法 (methods) :简要说明研究课题的基本设计, 使用了什么材料和方法, 如何分组对照, 研究范围及精确程度, 数据是如何取得的, 经何种统计学方法处理。③结果 (results) :简要列出研究主要结果和数据, 有什么新发现, 说明其价值及局限。叙述要具体、准确。并需给出结果的置信值、统计学显著性检验的确切值。④结论 (conclusion) :简要说明经验证、论证取得的正确观点其理论价值或应用价值, 是否可推荐或推广等。英文摘要的内容与中文摘要的内容大体相一致, 英文摘要四要素的小标题应根据实际情况确定单复数。

在英文摘要内容前仍需附英文文题、作者单位 (包括邮政编码) 及作者姓名。中、英文摘要具体书写格式同前。敬请广大读者、作者周知, 并遵照此要求投稿, 力求杂志更加规范化、标准化。

篇4：本期论文英文摘要

Abstract:Whether the bank operates well depends on the public confidence, i.e. the bank credit worthiness. In-creasing bank capital adequacy and maintaining the stable bank income inflow, the steady support and guaranteed quality,etc. are the means to raise and maintain the bank credit worthiness. In our country the bank capital adequacy has not yetbeen up to the international standards; the credit asset quality is low; the profit is yearly decreased, and the state creditworthiness guarantee has become the key factor of prudently operating the state bank. Posterior to the accession to WTO,with the opening up of banking businesses, the role of the state credit worthiness guarantee has been weakening and itswithdrawal is faced with a series of difficulties.

Key Words: guaranteed state credit worthiness; state bank; capital fund; guaranteed deposit system

篇5：论文-中英文摘要

随着信息时代的到来，信息高速公路的兴起，全球信息化进入了一个新的发展时期。人们越来越认识到计算机强大的信息模块处理功能，使之成为信息产业的基础和支柱。

车辆管理系统用计算机管理机动车辆的档案，运营管理以及驾驶员信息的一种计算机应用技术的创新，在计算机还未普及之前车辆管理都是由工作人员手工抄写的方式来操作的。现在一般的车辆管理都是采用计算机作为工具的实用的计算机智能化车辆管理程序来帮助工作人员进行更有效的机动车辆管理。车辆管理系统是典型的信息管理系统(MIS)，其开发主要包括后台数据库的建立和维护以及前端应用程序的开发两个方面。对于前者要求建立起数据一致性和完整性强、数据安全性好的库。而对于后者则要求应用程序功能完备，易使用等特点。经过分析，我们使用 MICROSOFT公司的 VISUAL BASIC开发工具,利用其提供的各种面向对象的开发工具，尤其是数据窗口这一能方便而简洁操纵数据库的智能化对象，首先在短时间内建立系统应用原型，然后，对初始原型系统进行需求迭代，不断修正和改进，直到形成用户满意的可行车辆管理系统系统。

关键字: 车辆管理系统;数据库;信息管理系统;智能化

Abstract

篇6：会计中英文论文摘要

本文主要针对我国固定资产会计准则与国际财务报告准则之间的差异进行比较及分析。文章首先介绍了我国固定资产新旧准则的主要变化。进而比较我国固定资产准则与其相对应的国际财务报告准则之间的差异，着重分析了两者之间在后续计量模式、减值损失转回处理以及对持有待售资产的终止确认处理三方面的重要差异。最后就完善我国固定资产准则进行了思考并提出了自己的见解。

关键词：

固定资产 成本模式 重估价模式减值损失转回 持有待售资产

Abstract