495 research outputs found

    Research of the project management mode of the campus recruitment

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    随着高等教育快速发展和高等教育制度的改革,高校的毕业生数量也迅速增加,大学生就业问题、初次就业率的高低再次成为核心焦点。现在,就业率高低作为衡量大学办学质量的一个重要指标,是高校就业工作的重中之重。目前,各高校都集思广益采取多种措施,通过各种途径、方法去努力保障毕业生顺利就业,从而提高学校的就业率和签约率。而举办高校校园招聘会无疑是众多方法途径中最直接有效的,也是高校最常使用的方式之一。高校组织校园招聘会是一项无论在组织和沟通还是时间、成本等方面都有着极高要求的复杂工作,因此对科学有效管理校园招聘过程进行研究是具有现实意义的。 本文介绍了项目、项目管理的概念,在明确了项目的基本特征和对校园招...Along with the progress of popularization of higher education in our country and the deepening of higher education system reform, the fast rise in number of college graduates, this makes the problem of employment of college students is more and more outstanding performance. Graduates employment has become an important index for measuring colleges and universities. So universities will take various...学位:工程硕士院系专业:管理学院_工程硕士(项目管理)学号:X201115301

    Parametric optimum design of an irreversible photon-enhanced thermionic emission solar cell hybrid system

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    考虑实际系统中存在的多种传热损失,本文建立一类不可逆光子增强热离子发射太阳能电池与温差热电发电器组合而成的混发电系统模型.基于太阳能电池与温差热电发电器之间的能量平衡方程,导出该混合系统输出功率和效率的表达式.通过数值计算,详细分析了光增热离子太阳能电池的面积、阴极半导体材料的禁带宽度、电子亲和势以及温差热电发电器的无量纲电流对混合系统优化性能的影响,确定混合发电系统运行于最大效率下光子增强热离子太阳能电池阴极材料的禁带宽度,电子亲和势,电池面积和温差热电发电器的无量纲电流的优化值.结果表明,采用混合发电系统,太阳能转换效率与工作于相同条件下的单一光增热离子太阳能电池的效率相比可提高约10%,而光增热离子太阳能电池阴极半导体材料禁带宽度在最大效率下的优化值则比单一光增热离子太阳能电池的小.本文所得结果可为实际光子增强热离子太阳能电池混合发电系统的设计和优化运行提供理论依据.A class of an irreversible thermodynamic model of the hybrid power system consisting of a photon-enhanced thermiomic emission solar cell(PETSC) and a thermoelectric generator(TEG) is established, in which some main irreversible losses existing real hybrid systems are taken into account. Based on equations of the energy balance between the solar cell and thermoelectric generator,expressions for the power output and efficiency of the hybrid system are derived. By using the numerical calculation, influences of the cell area, the energy band gap and electron affinity of the cathode semiconductor materials, and the dimensionless current of the generator on the optimal performance of the hybrid system are analyzed in detail. Under the operating condition of maximum efficiency, the optimal values of some important performance parameters of the hybrid system, such as the energy band gap, electron affinity, area and dimensionless current, are given. The results obtained in this paper show that by using the hybrid system, the solar energy conversion efficiency can be increased by about 10% and the optimal value of the energy band gap for the PESTC of the hybrid system at maximum efficiency is smaller than that of the energy band gap for alone operating PESTC. All the results obtained in this article will provide some theoretical basis for the design and optimal operation of practical PETSC hybrid system.国家自然科学基金(批准号:11175148,11305064);; 福建省自然科学基金(批准号:2011J01012);; 华侨大学引进人才科研启动资金(编号:09BS510)资助项

    打造小而有效的政府——日本规制改革的回顾与评析

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    二战后的日本,在政府主导的经济发展模式下,创造了"东亚奇迹",同时也使日本成为一个规制大国。随着国内泡沫经济的破裂和全球经济一体化的驱动,日本政府启动了一系列的规制改革来处理政府与市场的关系,向以市场为导向的经济发展模式转变。日本规制改革先后经历了行政审批精简、放松规制和规制改革3个阶段,通过设置结构改革特区,启动市场化改革,实施"国民参与"等举措,有效推动了日本规制改革的进程,但仍面临多元官僚制的制约,利益集团的寻租,流于形式的规制影响评估等问题。通过系统回顾和梳理日本规制改革的演进,可以发现日本规制改革在改革机制设计、建构法律体系、完善参与机制、重视社会性规制等方面,均为我国推动国家治理体系和治理能力现代化提供了有价值的启发和借鉴。国家自然科学基金“作为一种国家治理新方式的合约制:机制设计与有效性检验”(71473210

    クロヒナスゲCarex gifuensis Franch.(Cyperaceae)におけるクローンの構造と季節変化

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    [論文

    Contents and Structure Analysis of Tannins in Leaves of Three Cultivars of Camellia sinensis

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    测定了本山、黄旦和铁观音三个品种茶树成熟叶片的总酚及可溶缩合单宁含量,并通过基质辅助激光解吸附飞行时间质谱(MAldI-TOfMS)研究了茶叶缩合单宁的基本结构。结果显示,三种茶叶均具有较高的总酚含量,大约为200Mg/g;三种茶叶的缩合单宁是以(表)儿茶素(EC/C)和(表)棓儿茶素(EgC/gC)为基本结构单元的均聚物和杂聚物,且大部分聚合物的结构单元之间存在A型和b型两种连接方式,其中本山和黄旦缩合单宁的最高聚合度要大于铁观音。The contents of total polyphenols and extractable condensed tannins in leaves of three types of Camellia sinensis (Benshan,Huangdan and Tieguanyin) were determined.In addition,the structures of condensed tannins were characterized by matrix-assisted laser desorption/ionization time-of-flight mass spectrometry (MALDI-Tof MS).Three types of tea leaves have total phenolic contents as high as 200 mg/g.The majority of condensed tannins in the three types of C.sinensis are identified as the mixtures of procyanidins and prodelphinidins with a medium level of galloylation through the linkage of A-type and B-type interflavan bonds.Meanwhile the degree of polymerizations is higher in Benshan and Huangdan than in Tieguanyin.国家自然科学基金项目(40376026;30671646

    FEC基电解液对高压正极材料Li2CoPO4F电化学性能的影响

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    本文研究了以氟代碳酸乙烯酯FEC(fluoroethylene carbonate)为共溶剂的电解液对高压正极材料Li2CoPO4F电化学性能的影响,与碳酸酯基电解液1 mol·L-1LiPF6EC/DMC=1:1(m:m)相比,1 mol·L-1LiPF6FEC/DMC=1:1(m:m)可显著提高Li2CoPO4F的循环稳定性.通过线性扫描伏安法(LSV)、扫描电镜(SEM)、X射线光电子能谱(XPS)、X射线衍射(XRD)结合电化学阻抗(EIS)对FEC改善Li2CoPO4F材料循环稳定性的机理进行了探索,结果表明与传统碳酸酯基电解液相比,FEC基电解液在高压下有着优异的抗氧化性,能够有效抑制电解液的氧化分解.同时,FEC基电解液中形成的表面膜具有更高的稳定性,能够抑制电极/电解液界面副反应的发生,提高循环过程中电极材料结构稳定性,从而有益于提高Li2CoPO4F材料的电化学性能.福建省自然科学基金项目(No.2014J05019);;国家自然科学基金项目(No.21233004,No.21303147);;厦门大学校长基金(No.20720150090)资

    Content and Structure of Tannins in Different Parts of Bayberry (Myrica rubra (Lour.) Sieb. et Zucc.)

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    对杨梅的叶、枝和树皮的总酚含量与可溶缩合单宁含量进行了测定,并利用基质辅助激光解吸附飞行时间质谱(MALDI-TOFMS)详细研究了不同部位中缩合单宁的类型、聚合度及聚合物的分布情况。结果表明:树皮的总酚含量最高(43.56%),叶次之(34.69%),枝最低(18.53%);树叶的可溶缩合单宁含量最高(25.67%),皮次之(17.93%),枝最低(8.01%);3组分的缩合单宁都以(表)棓儿茶素-3-O-棓酸酯(EGCG/GCG)为基本结构单元的原翠雀定,且大部分聚合物的结构单元之间存在A型和B型两种连接方式,但其中叶和枝缩合单宁的聚合度要大于树皮。Contents of total phenolics and extractable condensed tannins in leaves,branches and bark of Myrica rubra(Lour.)Sieb.et Zucc.were determined.In addition,type of condensed tannins,degree of polymerization and distribution of polymer were characterized by matrix-assisted laser desorption/ionization time-of-flight mass spectrometry(MALDI-TOF MS).The results were showed as follows:total phenolics content was the highest in bark(43.56 %),followed by leaves(34.69 %),and then branches(18.53 %);while extractable condensed tannins content was the highest in leaves(25.67 %),followed by bark(17.93 %),and then branches(8.01 %).Epigallocatechin-3-O-gallate was invariably the basic unit occurring in the three condensed tannins.A-type and B-type linkages were the common types among the structural units of polymers.Meanwhile tannins in leaves and branches had the larger highest polymerization degree than bark.国家自然科学基金(40376026;30671646);; 教育部新世纪优秀人才支持计划(NCET-07-0725

    鲁米诺电致化学发光机理的研究

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    The electrochemiluminescence (ECL) of the luminol in aqueous alkaline solu tion has been studied using cyclic voltammetry, potential step tecdrique and time resolved UV/Vis spectroscopy. The results of the electrochemical experimens showed that the ECL of the luminol can carry out in the potential region of oxygen adsorption also and lead us suggest a new light-endtting pathway for the bonol on which the reaction between some of the luminol radical Anons and the adsorbed superokide radical sndtaneously gener ated in the anodic oxidation process yields excited 3-drinophthalate, the light emitting species. The results of the time resolved spectroscopic experiments manifested that the formation of the polymeric film produced by the luminol radical anions is one of important faetors decreasing the ECL of the luminol
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