大学生领导力模型的构建

大学生领导力研究日益引起领导学界的关注,国外大学生领导力研究已比较成熟,但我国大学生领导力研究还处于起步阶段。基于开放式问卷调查、访谈和词汇问卷调查,构建大学生领导力模型,其中包括五个维度:领导感召力、领导决断力、领导前瞻力、领导影响力、领导控制力。     

Comparison of the effect of hydrogen incorporation and oxygen vacancies on the properties of anatase TiO2: electronics,optical absorption,and interaction with water

Hydrogenation has been recently developed as an approach to improve the visible-light response of titanium dioxide （TiO2）; however, the effect of hydrogenation on the electronics and optical absorption of anatase TiO2 has been widely debated. In this work, the electronic structures and optical properties of hydrogenated TiO2 and its interaction with water have been studied using the density functional theory plus Hubbard model. A comparison of the effect of hydrogenation and introduction of oxygen vacancies （OVs） to TiO2 is presented. It is found that both hydrogenation and OVs can promote the absorption of visible light and strengthen the adsorption of water. Compared with OVs, hydrogen incorporation can lead to local distortion and even amorphous structures when it is heavily doped.     

Micro/-nanoscaled topography-coupled-mechanical action into functional biointerface

The micro/-nanoscaled functional biointerfaces aroused much interest of their key unit element to present unique functions. So far it is still difficult to describe the whole picture of this process. More and more evidences are beginning to support the theory of ‘‘mirco/-nanotopography-coupled-mechanical(TCM) action' into functional biointerfaces.Herein, we aim to highlight TCM action on varied micro/-nanoscaled functional biointerfaces, namely to achieve better understanding of micro/-nanoscaled structures by introducing interfacial mechanical behaviors. In this article, recent progressions on ‘‘TCM on air/liquid/solid-phase biointerfaces in nature', ‘‘in vivo TCM behaviors at micro/-nanoscales' ',‘‘TCM in micro/-nanoscaled artificial surface with living Cells' ' and ‘‘topography, interfacial curvature, mechanics' 'are reviewed. Certain new concepts of ‘‘TCM action based on spatial curvature', ‘‘medically functional biointerfaces' ' and‘‘biomechanopharmacology' are also proposed.     

An equivalency condition of nonsingularity in nonlinear semidefinite programming

<正> In this paper,an equivalency condition of nonsingularity in nonlinear semidefinite programming,which can be viewed as a generalization of the equivalency condition of nonsingularity for linearsemidefinite programming,is established under certain conditions of convexity.     

中国企业从事国际商务的优劣势分析

随着经济全球化进程的加快和我国的成功入世,越来越多的中国企业开始从事国际商务.正确认识我国企业从事国际商务的优劣势是企业国际商务活动成败的关键.文章首先介绍了国际商务的基本理论,接着分析了我国企业从事国际商务的优劣势,最后提出了提升中国企业从事国际商务活动竞争力的对策建议.     

等离子熔覆项目的可行性分析

通过分析评价刮板输送中部槽机等离子熔覆项目的市场情况、建设规模和经济效益,得出了西山煤电集团公司拟建等离子熔覆项目生产线是可行的、必要的.     

Electrooxidation of Mn(Ⅱ) on Pb-Sb-As Electrode in Sulfuric Acid

The electrooxidation of Mn(Ⅱ) on Pb-Sb-As alloy electrode in sulfuric acid has been investigated.In order to make the two steps of indirect electrosynthesis of benzaldehyde carried out in the same sulfuric acid concentration and also obtain high current efficiency of Mn(Ⅱ) to Mn(Ⅲ) and high yield of Mn(Ⅲ) oxidizing toluene to benzaldehyde in the mean time,the electrooxidation of Mn(Ⅱ) in 60% H2SO4 has been studied.Experimental results show that high current efficiency of Mn(Ⅲ) (about 75%) is obtained in 60%H2SO4 at 60℃.The reason affecting the current efficiency of Mn(Ⅲ) is discussed,and it is the coordination of sulfuric acid concentration and electrolytic temperature.The law is found that it is suitable for electrolysis at low temperature when sulfuric acid concentration is low and at high temperature when sulfuric acid concentration is high.     

轨道交通网的层次结构

2010年7月1日,沪宁城际高速铁路正式投入运营.沪宁城际高速铁路贯穿了我国城市群最密集、生产力最发达、经济增长最强劲、发展最具活力的长三角核心区域,在上海、南京间建成一条快速交通走廊,形成"同城效应",它必将成为推动长三角一体化发展的强大引擎.     

介观尺度金属孪晶变形的强烈晶体尺寸效应

主导许多材料力学行为的孪晶变形是一种局部晶体高度协调一致的非弹性剪切变形过程,其发生原因与时空特性仍然保持着某种神秘色彩。本项研究利用纳米压入仪下微柱体压缩与相应的透射电镜原位定量变形表征技术,发现随所用钛铝合金单晶外观尺度逐步减小到1个μm时,孪晶切变所需应力随之显著提高,表现出很强的尺度依赖性。当晶体的外部几何尺度进一步减小到亚μm量级时,材料的塑性变形方式发生了根本性的转变,孪晶变形完全由通常的位错滑移变形取代,而材料所能承受的最大流变应力亦呈现出一种接近于所用材料理想强度水平的＂应力饱和＂平台现象。本研究提出了以螺位错为媒介的孪晶变形＂受激滑移＂模型,完美地解释了孪晶变形具有强烈晶体尺寸效应的内在原因。     

面向功率键图通用仿真软件

介绍了一种机电液动力系统通用动态仿真软件，该仿真软件可由原理图自动生成功率键图，由功率键图自动建立状态变量模型，实现了对非线性机电液综合动力系统的计算机仿真，有效提高了仿真精度和友善性。