開發臭氧層破洞STS單元

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Study on the formation mechanism of gelation of konjac glucomannan

利用直流电，在添加CaCl2、MgCl2、FeCl3、钨酸钠的条件下，分别制备了KGM-Ca、KGM-Mg、KGM-Fe、KGM-T凝胶，对获得凝胶后电处理KGM溶胶电极两侧pH进行了测试,并对KGM-T凝胶进行了FTIR、Raman、SEM、XRD、DSC表征。结果表明，正极附近KGM溶胶为酸性，负极一侧KGM溶胶为碱性。SEM表明KGM在粉末状态下，外表呈现规则的微纤维状，KGM分子间有氢键；KGM溶胶冻干后呈现大小孔洞不均匀的支架结构，直流电处理的KGM溶胶冻干后的扫描电镜没有发生明显的变化，电处理未使KGM链的糖苷键发生断裂；KGM-Ca凝胶的表面形貌呈现大小孔洞不规则的絮状结构，KG...Konjac glucomannan (KGM) -Ca 、KGM-Mg 、KGM-Fe 、KGM-tungsten (KGM-T) gels were successfully produced under DC electric fields in the presence ofCaCl2、MgCl2、FeCl3 and sodium tungstate. pH experiments were conducted tomeasure pH value of DC treated KGM sol. And KGM-T gels were characterized byFTIR、Raman、SEM、XRD and DSC. pH experiments showed that KGM solcontaining Na2WO4.2H2O in the vicinity of the p...学位：博士后院系专业：材料学院_软物质与功能材料学号：201317006

异源四倍体银鲫外周血和精巢的组织学特征

通过比较D系三倍体银鲫(Carassius auratus gibelio Bloch)与异源四倍体银鲫,我们发现异源四倍体的外周血与精巢组织跟三倍体银鲫存在明显差异。HE染色结果表明,异源四倍体银鲫外周血红细胞有明显的分裂倾向。利用流式细胞术对D系三倍体银鲫与异源四倍体银鲫外周血的DNA直方图进行比较,结果表明异源四倍体外周血的DNA直方图有两个主峰。此外,我们观察到异源四倍体银鲫精巢的三种类型,其中Ⅰ型精巢可以产生正常精子,Ⅱ型可观察到精小囊结构,但不能产生精子,Ⅲ型精巢未发育出精小囊结构。进一步用银鲫Vasa抗体对精巢切片进行组织免疫荧光共聚焦显微分析,结果表明,Ⅰ型精巢的生殖细胞完成了减数分裂,能观察到精原细胞、初级精母细胞、次级精母细胞,以及大量位于精小管中间的精子细胞和精子;而Ⅱ型精巢的生殖细胞不能完成第二次减数分裂,精小囊中存在大量的初级和次级精母细胞,没有精子细胞产生。研究丰富了对异源四倍体银鲫生物学性状的认识

CuInS_2 Quantum Dot-Sensitized Solar Cells Fabricated via a Linker-Assisted Adsorption Approach

分别以Cu I和In AC3作为铜源和铟源,十二硫醇(ddT)作为硫源,采用直接加热法合成不同尺寸的Cu In S2(CIS)量子点.运用X射线衍射(Xrd),拉曼光谱(rAMAn),高分辨率透射电镜(HrTEM),紫外-可见(uVVIS)吸收光谱表征其相结构、形貌及光学性能.结果表明:制备的CIS量子点为黄铜矿结构,且随着时间的延长,量子点逐渐长大,吸收光谱的激子吸收峰逐渐红移,表现出量子尺寸效应.采用巯基乙酸为双功能耦联剂辅助吸附法制备CIS敏化的TI O2薄膜.通过衰减全反射红外光谱(ATr-fTIr)分析得出,巯基乙酸上的羧基与TI O2表面羟基连接,另一端上的巯基代替长链的ddT与CIS耦联,将CIS成功锚定在TI O2表面.该方法不仅操作简单,而且容易实现CIS在TI O2表面的吸附.太阳电池光电性能测试表明,粒径大小约为3.6 nM的CIS量子点表现出最优的吸附能力以及光电转换性能.进一步采用连续离子吸附层法对CIS敏化的TI O2薄膜进行Cd S包覆,光电转换性能大大提高,其效率达到2.83%,这主要源于Cd S的包覆钝化了CIS的表面缺陷,有效地降低了电子复合.Colloidal chalcopyrite CuInS2(CIS) quantum dots(QDs) were synthesized using copper(I) iodine(CuI) and indium(III) acetate(In Ac3) as metal cationic precursors, and dodecanethiol(DDT) as the sulfur source and solvent.The microstructure and optical properties of the prepared CIS QDs were characterized by X-ray diffraction(XRD), Raman spectroscopy, high-resolution transmission electron microscopy(HRTEM), and UVVis absorption spectroscopy.The results showed that the CIS consisted of chalcopyrite phase and exhibited Cu-Au ordering.With prolonged reaction time, the grain sizes of the QDs became larger and the absorption edges of the CIS QDs showed a red-shift owing to the size-induced quantum confinement effect.For the first time, DDT-capped CIS QDs with narrow size distribution were connected to the inner surface of mesoporous Ti O2 films via a thioglycolic acid(TGA)-assisted adsorption approach, which was simple and easy to carry out.The adsorption behaviors of both TGA and the CIS QDs on the Ti O2 films were detected by attenuated total reflectance Fourier transform infrared(ATR-FTIR) spectroscopy.The results indicated that TGA was adsorbed onto the surface of Ti O2 via COOH groups while the ―SH group was exposed outside, and replaced DDT at the surface of the CIS QDs, leading to the attachment between Ti O2 and CIS.It was revealed that the CIS QDs of ~3.6 nm in size exhibited the best light absorption capacity and photovoltaic performance.An over-coating of Cd S significantly improved the performance of the QDSSCs owing to decreased electron recombination, and a power conversion efficiency of ~2.83% was obtained.supportedbytheNationalNaturalScienceFoundationofChina(21073193;21273241;21376195); ProjectontheIntegrationofIndustry;EducationandResearchofGuangdongProvince;China(2012B091100476); ScienceandTechnologyResearchProjectofGuangzhou;China(2014J4100218)~

Research on Nonstop Cultivating Model for Doctoral Students in China——Taking an Example of X University

我国研究生教育规模的扩张，彰显着我国教育实力的增强。但与西方国家相比，我国的博士生教育发展历史较为短暂，规模的不断扩张势必带来诸多问题。博士生的培养质量的提高成为当前我们面临的主要任务，博士生培养模式的改革成为提高博士生培养质量改革的关键。“直博生”培养模式是近年来新兴起的一种博士生培养模式，它打通了硕士生和博士生两个培养阶段，这种培养模式为高校保留优质生源、提高培养效率、培养科研创新人才贡献了力量。 在系统地总结了我国“直博生”培养的历史沿革和发展状况以及发达国家“直博生”培养模式经验的基础上，以X大学为案例开展访谈调查研究。X大学是一所高水平的研究型大学，是早期开展“直博生”培养的高校之...The expansion of the scale of higher education, highlighting the enhancement of China's educational strength. However, compared with the western countries, the development history of China's doctoral education is too short,the expansion of the scale is bound to bring a lot of problems. Cultivating quality should be further improved is the main task of doctoral education, and the reform of doctoral...学位：教育学硕士院系专业：教育研究院_高等教育学学号：2572014115181

Synthesis of Aromatic Amines by Pd / C Catalytic Hydrogenation Aromatic Nitro-compounds

以5%Pd/C为催化剂,芳香族硝基化合物在温和条件(30℃,H2/0.1 MPa)下还原成芳胺。研究了芳环上的取代基对催化加氢反应的影响。结果表明:对位取代的芳硝基化合物的加氢反应速率为:H>CH3>CO2CH3>CF3>F>OCH3;间位取代芳硝基化合物加氢反应速率为:H>CH3>CF3>F>CO2CH3>OCH3>CN;邻位取代芳硝基化合物加氢反应速率为:H>CF3>CH3>OCH3>F>CO2CH3>CN

厌氧条件在不同Fe( II) 浓度测定方法中必要性的比较研究

厌氧是目前Fe(II)测定方法中常选择的处理方式,但是不可避免会给实验操作带来不便。为了方便、准确地测定铁还原体系中的Fe(II)浓度,对比研究了厌氧条件对草酸—草酸铵和盐酸两种典型浸提方法测定Fe(II)浓度的影响。结果表明:对于草酸—草酸铵浸提法,厌氧条件是必须的,以防止提取液中的Fe(II)被氧化,而且样品浸提1 h 便可用于Fe(II)的测定;然而对于盐酸浸提法,厌氧条件却并不是必须的,对Fe(II)浓度测定基本不产生影响。因此,为简化实验操作或在没有厌氧条件的情况,可利用盐酸浸提法测定铁还原体系中Fe(II)浓度

中国货币政策规则中的时变门限效应研究

本文提出了具有时变阈值的门限泰勒规则模型,并运用该模型对中国1992-2014年间货币政策规则中的时变门限效应进行了实证研究。结果表明,时变阈值的引入揭示了中国货币政策规则的三大显著特征:第一,非对称性,即高通胀时期利率对通胀缺口和产出缺口的反应系数值均大于低通胀时期;第二,不稳定性,即不论通胀率高低,利率对通胀缺口的反应系数均非显著大于1;第三,时变性,即在经济发展的不同阶段,货币当局在制定货币政策时所参考的阈值具有显著的时变特征。国家自然科学基金项目(71703030,71573072)的资助;中央高校基本科研业务费专项资金(2015B13114);福建省统计科学重点实验室(厦门大学)开放课题(2016006

Can Accountability Encourage Autonomy? : A case study of university evaluation in a Japanese University

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