Electrochemical and Spectroscopic Study of Electron Transfer in Hybrid Systems of II-VI Nano Semiconductors

II-VI族半导体纳米材料与氧化还原蛋白复合体系因其特殊的光学、电学和光电性质，得到研究者越来越多的关注，并在发光、光电等领域具有重要的应用价值。近年来随着研究的不断深入，II-VI族纳米半导体粒子与氧化还原蛋白间相互作用的信息变得十分有意义：对复合体系中相互作用如电子传递的研究不仅能够提供二者间的相互影响和作用机理，而且能够为构筑相关的传感器、光电器件等提供理论基础。 本文利用电化学、光谱和光电化学方法研究了以ZnO、CdS为代表的II-VI族半导体纳米材料与氧化还原蛋白细胞色素c构筑的复合体系。主要包括以下两个方面的工作：（1）电沉积制备ZnO纳米棒修饰电极，将其应用与于细胞色素c等氧化...Hybrid systems of II-VI semiconductor material and redox protein, because of their special physical and chemical properties, attract more and more attention and have significant application value in fields of photoluminescence, photovoltaics, and sensors. During past years, with in-depth study, information of interaction between II-VI semiconductor material and redox protein is extremely valuable....学位：工学硕士院系专业：化学化工学院化学系_应用化学学号：2052008115176

CKM理论的人民币汇率失衡测算

本文通过CkM理论证明了购买力平价理论的正确性,实际均衡汇率是动态平稳过程。并通过修正kMC-STr模型的结构突变函数,建立S-STr模型。该模型能更好地解释存在多个结构突变点、并有升值趋势的非线性稳定问题。由此模型对人民币实际均衡汇率进行估计,并得到5个阶段的测算,发现人民币现阶段处于略微高估状态,而非低估。教育部新世纪优秀人才支持计划“全球金融危机下中国外汇储备管理研究”(NCET-08-0476

Au Nanoparticles Based Colorimetric Detection of Conformational Changes in Cytochrome c

Corresponding author. Email: [email protected]; Tel: +86-592-2189663.[中文文摘]金纳米粒子(AuNPs)的颜色会随着细胞色素c(Cytc)构象变化而发生较大的变化,作者在改变原测定流程的基础上利用这种有规律的变化研究和测定了H+和L-半胱氨酸(L-Cys)对Cytc的构象变化.实验中分别加入pH=1-13的Cytc,可以使AuNPs显示青、蓝、紫、红等明显不同的颜色,从而可以利用AuNPs比色快速测定不同pH值的Cytc构象变化.在pH=7时,当附加L-Cys浓度从低浓度变化到高浓度时,AuNPs颜色逐渐从紫色变化到蓝色、青色,从而实现利用AuNPs比色测定由L-Cys所引起Cytc构象变化.圆二色(CD)光谱证实了pH=1-13和不同浓度L-Cys下的Cytc构象变化.借助紫外-可见吸收光谱和扫描电子显微镜(SEM)进一步明确了加入Cytc后AuNPs的不同聚集状态与其颜色变化的关系.[英文文摘]The colors of Au nanoparticles(Au NPs) change along with conformational changes in cytochrome c(Cyt c).We exploited this property for the colorimetric detection of Cyt c conformational changes induced by H + and L-cysteine(L-Cys).We improved the conventional procedure for this detection.After the addition of Cyt c within different pH values,the Au NPs are either cyan,blue,purple or red.This indicates that the Au NPs can be applied to the rapid colorimetric detection of pH-induced conformational changes in Cyt c conformational changes caused by interaction with L-Cys. The conformational changes of Cyt c were verified by circular dichroism (CD) spectroscopy. The relationship between the aggregation states and colors of the Au NPs after the addition of Cyt c was characterized by UV-Vis absorption spectroscopy and scanning electron microscopy (SEM).国家自然科学基金(20603027,20423002)资助项

高管从军经历提升了内部控制质量吗?——来自我国上市公司的经验证据

本文基于2007～2015年我国A股上市公司,采用Chen等(2016)\"中国上市公司内部控制指数\",探索了高管从军经历是否有助于提高企业内部控制质量。研究发现:高管从军经历能显著提高内部控制质量;且离军区距离较近、军官转业到企业和具有MBA特征的从军经历会进一步加强内部控制质量。此外,考察内部控制单独要素发现,高管从军经历对内部环境和内部监督质量的提高有更为直接的影响。对机理渠道的探索表明,从军经历通过影响管理层对内部控制的讨论与分析进而提升内部控制质量。本文的研究结果意味着,重视并充分发挥高管从军经历的治理作用是改善公司治理的重要途径。国家自然科学基金重点项目“信息生态环境与企业内部控制有效性问题研究”(项目批准号:71332008);;教育部人文社会科学重点研究基地重大项目“中国上市公司内部控制评价与指数研究”(项目批准号:10JJD630003)的阶段性研究成

独立董事联结与内部控制对盈余管理的治理效应

为明确独立董事联结和内部控制在治理盈余管理中的角色定位,本文采用匹配+双重差分(DID)的方法,并结合应计和真实两类盈余管理进行实证研究。研究发现:在应计盈余管理方面,独立董事联结和...国家自然科学基金重大项目“互联网时代的公司财务行为研究”(71790604);国家自然科学基金重点项目“信息生态环境与企业内部控制有效性问题研究”(71332008);国家自然科学青年基金项目“内部..

Preparation and Photoeletrochemical Performance of CdS Quantum Dot Sensitized ZnO Nanorod Array Electrodes

Corresponding author. Email: [email protected]; Tel: +86-592-2189663[中文文摘]采用连续式离子层吸附与反应法制备了CdS量子点敏化的ZnO纳米棒电极.应用扫描电子显微镜(SEM)、X射线衍射(XRD)和透射电子显微镜(TEM)对CdS量子点/ZnO纳米棒电极的形貌、晶型和颗粒尺寸进行了分析和表征;采用光电流-电位曲线和光电流谱研究了不同CdS循环沉积次数及不同沉积浓度对复合电极的光电性能影响.结果表明,前驱体浓度都为0.1mol·L-1且沉积15次敏化后的ZnO纳米棒阵列电极光电性能最好.与单纯的ZnO纳米棒阵列电极和单纯的CdS量子点电极相比,其光电转换效率显著提高,单色光光子-电流转换效率(IPCE)在380nm处达到76%.这是因为CdS量子点可以拓宽光的吸收到可见光区,并且在所形成的界面上光生载流子更容易分离.荧光光谱实验进一步说明了光电增强的原因是,两者间形成的界面中表面态大大减少,有利于减少光生电子和空穴的复合. [英文文摘]We sensitized CdS quantum dots on a ZnO nanorod array electrode by the successive ionic layer adsorption and reaction method.Scanning electron microscopy(SEM),X-ray diffraction(XRD),and transmission electron microscopy(TEM) experiments were performed to characterize the morphology,crystalline phase,and grain size of the CdS quantum dot sensitized ZnO nanorod array electrodes.The effect of CdS deposition cycle number and the precursor concentration were studied by photocurrent-potential characteristics and photocurrent spectra. The results showed that the best photoelectrochemical performance was obtained at 0.1 mol·L-1 for both Cd2+ and S2- after 15 cycles. Meanwhile, the composite films exhibited a remarkably enhanced photoelectric conversion efficiency compared with the ZnO nanorods array films and with CdS quantum dot electrodes. The monochromatic incident photon-toelectron conversion efficiency (IPCE) was as high as 76% at 380 nm. This may be attributed to the broad light harvesting capability of CdS and the efficient separation of photogenerated carriers on its interface. The reason for this enhancement was further confirmed by a photoluminescent experiment. The results showed that sensitization with CdS quantum dots reduced the recombination of electron and hole pairs resulting in an enhancement in the photocurrent.国家自然科学基金(20433040

Electrochemical Behavior of Redox Proteins on ZnO Nanorod-Modified Electrodes Prepared by Electrodeposition

Corresponding authors. ZHOU Jian-Zhang, Email: [email protected]; Tel: +86-592-2189663.[中文文摘]采用恒电位阴极还原法在金电极表面一步修饰ZnO纳米棒,制备成ZnO纳米棒修饰电极.扫描电子显微镜(SEM)和X射线衍射(XRD)结果显示制得的ZnO为直径约100nm的六棱柱状纤锌矿晶体纳米棒.使用ZnO纳米棒修饰的金电极研究细胞色素c的直接电化学行为,结果表明:ZnO纳米棒修饰的金电极能有效探测到细胞色素c的铁卟啉辅基在不同价态下的电化学行为;细胞色素c吸附后,ZnO纳米棒修饰的金电极对过氧化氢的电流响应呈现良好的线性关系.[英文文摘]We successfully prepared ZnO nanorod-modified Au (ZnO nanorod/Au) electrodes using one-step cathodic electrodeposition. Scanning electron microscopy (SEM) and X-ray diffraction (XRD) were used to characterize the morphology and crystal phase of the ZnO nanorods. The data showed that the ZnO nanorods were wurtzite type crystals with a hexagonal rod shape and a diameter of about 100 nm and that the ZnO nanorods were arranged well on the surface of electrodes. These ZnO nanorod-modified electrodes were able to detect direct electron transfer from cytochrome c (cyt c). Cyclic voltammograms showed that the direct electron transfer of cyt c with heme iron in different valence states was easily achieved by the ZnO nanorod/Au electrode. Data of amperometric responses demonstrated that a linear amperometric response to hydrogen peroxide was observed on the ZnO nanorod/Au electrodes after adsorbing cyt c.国家自然科学基金(20603027,21021002,20973134); 国家高技术研究发展专项经费项目(2009AA03Z327)资

高中一年级学生述情障碍与焦虑的相关性

目的探讨高中一年级学生述情障碍与焦虑的关系。方法采用多伦多述情障碍量表(TAS-26)及焦虑状态一特质问卷(STAI)对294名高一学生的述情障碍和焦虑程度进行调查。结果 TAS总分及TAS-因子Ⅰ、Ⅱ与STAI总分分别与状态焦虑(S-AI)、特质焦虑(T-AI)之间存在显著正相关(r=0.284,0.378,0.237,0.352,0.431,0.314,0.335,0.426,0.290;P=&nbsp;</p

基于遗传模拟退火算法的减速器模块化设计的模块方法

模块划分是模块化设计的基础及关键性步骤,通过对产品功能相关性、几何相关性和物理相关性的分析形成零件间模糊相似矩阵,然后以模块高内聚、低耦合作为划分的依据,采用遗传模拟退火算法（SAGA）对产品进行模块划分,为模块划分提供一种高效、合理的方式,结合典型减速器实例验证算法的可行性及实用性