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Perhaps a key adaptive advantage of the angiosperm is their ability to construct wood with much less expenditure of energy per unit weight.

也许被子植物适应优势的秘诀就在于它们有能力形成每单位重量的木材可支付少得多的能。

In this thesis,based on the DFT+NEGF first-principles method,we construct a lead-molecule-lead sandwich system with single benzene-based molecule to investigate the relationship between the structure and properties of the molecular devices and the factors that influence properties of the molecular devices.Our computational investigations on these molecular devices are primarily concentrated on the effect of contact geometry between molecules and electrodes,the effect of side groups,the effect of different torsion angle between two phenyl rings and the effect of external electric field.This thesis consists of five chapters:In Chapter one,we mainly introduce the research background and development of the molecular electronics,including the experimental fabrication of molecular electronic components and theoretical simulation methods.Afterwards we discuss the questions that need to be solved in this area.Finally,the main contents of this thesis are listed.In Chapter two,we introduce the theoretical methods used in this thesis, including the main first-principles calculation methods,i.e.,the Density-Functionmethod and nonequilibrium Green\'s function.

本论文拟采用密度泛函理论和非平衡格林函数相结合的第一性原理计算方法，选取苯基小分子作为研究对象，构建了金属电极/有机小分子/金属电极三明治结构体系，系统地研究了苯基分子器件结构的改变与分子电输运性质之间的关系以及影响分子器件电输运性质的相关因素，其中重点研究了分子与电极间可能的接触结构改变、官能团、分子间的扭转角以及外电场对苯基分子电输运性质的影响，本论文主要包括以下五个章节的内容：第一章为综述部分，主要介绍了分子电子学产生的背景、分子器件的研究意义、当前研究分子器件的实验和主要理论方法，以及目前在研究分子器件中存在的一些问题，最后给出了本论文的主要研究内容和技术路线。

The nature of both anthropocentrism and non-anthropocentrism ecological ethics is to construct a new ecological ethic view about the harmonious development of man and nature.

审视人类中心主义和非人类中心主义伦理观，其实质是建构一种人与自然和谐发展的新生态伦理观。

Objective To construct porcine influenza virus multi-epitope DNA vaccine and study the antigenicity of expressed product.

目的 构建猪流感病毒复合多表位核酸疫苗，并研究其表达产物的抗原性。

Abstract］ AIM: To construct phage antibody library with predetermined CDR3 and to screen humanized Fab of antihuman integrin ανβ3 monoclonal antibody by epitope guided selection.

摘 要］目的：构建预设CDR3基因的噬菌体抗体库，通过抗原表位导向选择方法筛选抗人整合素ανβ3单克隆抗体人源化Fab。

Based on the demand of the network wa***re and network antiterrorism, we are supposed to construct a network attacking platform both wartime and peacetime.

网络信息安全已经和一个国度的安全与好处紧密联系在一起。

It is a grand proposition to construct the private enforcement system of antitrust law in China.

反垄断法私人实施机制在中国的建构，是一项宏大的命题，需要付出长期而艰巨的努力。

Besides, the underground construct of this area is also very complicated, and the rupture system in mid-shallow layer is developed owing to Dongying center apophysis.

同时，该区地下构造也非常复杂，中浅层受东营中央隆起带的影响，断裂系统非常发育。

Then it proposes to construct the venture capital project screening appraisal's procedure and the standard and establish a set of complete assessment method, and has made the case analysis.

本文在对国内外文献做了系统、全面的梳理并回顾风险投资项目筛选评价理论的基础上，提出了风险投资项目筛选评价的程序和标准并建立了一套完整的评价方法，并做了案例分析。

Objective: To assess the construct validity of The Academic Aptitude Test for Middle School Students.

目的：进一步考证中学生学习能力倾向测验的结构效度。

Chimborazo and Cotopaxi, took me by the hand.

越过琴博腊索山和科托帕克西山。

This car is in a good condition.

这辆车的状况很好。