完善我国风险投资的运行环境

随着高科技产业尤其是IT产业的兴起，风险投资已成为一个被人们谈论越来越多的话题。风险投资是由职业金融家投入到新兴的、迅速发展的、有巨大竞争潜力的企业中的一种权益资本。从国外的经验看，二十世纪九十年代中期，风险投资成为一些国家高科技产业化的驱动器。在欧美发达国家，风险投资是高科技公司发展过程中最有力的融资渠道之一，对经济产生了巨大的影响，尤其推动了高科技成果的转化。在我国发展风险投资事业不仅有长远的战略意义，也有重大的现实意义。我国目前每年有科技成果约3万项，但形成产品的只有20%左右，而实现产业化的只有约5%。科技对经济的贡献率维持在32%左右，而发达国家达到60%-80%，除了技术上的原因外...学位：经济学硕士院系专业：经济学院财政金融系_金融学(含保险学)学号：K20013103

Evaluation on difference of therapeutic efficacy of Jiawei Xiaoyao Granules and Pills in treatment of emotional disorder during perimenopause based on Greene Climacteric Scale

目的:在前期加味逍遥丸治疗围绝经期情绪障碍具有比较优势的基础上,基于grEEnE量表探讨其颗粒剂和丸剂不同剂型间疗效差异。方法:经筛选后患有情绪障碍的围绝经期女性75例随机等分为A、b、C3组,分别对应采用帕罗西汀、加味逍遥丸和加味逍遥颗粒剂治疗8周。所有患者在治疗前后各进行1次grEEnE及其子因子评定,并在观察期结束时进行TESS评定。结果:grEEnE总分差及其焦虑、抑郁因子分差:3种治疗方法均能改善,且相互间无显著差异;grEEnE性因子和血管因子分差:后二组均优于A组(P<0.01);TESS评分:与A组比较,b、C组均有统计学意义(P<0.01),评分均小于A组,且后二组间无显著差异。结论:加味逍遥的2种剂型间疗效无显著差异,考虑到帕罗西汀的不良反应,治疗该病加味逍遥的2种剂型都值得推荐。Objective: To investigate the difference in therapeutic efficacy between Jiawei Xiaoyao Granules and pills based on the preliminary research of treating emotional disorder during perimenopause with Jiawei Xiaoyao Pills and Greene Climacteric Scale.Methods: 75 female patients with emotional disorder during perimenopause were slected and randomly divided into 3 groups as group A, B and C.Patients in the 3 groups were treated with paroxetine, Jiawei Xiaoyao Pills and Jiawei Xiaoyao Granules respectively for 8 weeks.Greene and Greene factors assessment were carried out in all the patients before and after treatment, and the TESS assessment was carried out at the end of the observation period.Results: The three therapies all could improve the gap in total score of Greene and its factors as anxiety and depressed, and the difference among these three groups was no significant.The factors of Greene and gap in score of vascular factors of group B and C was better than that of group A(P<0.01).The difference in TESS score between group A and group B and C was significant(P<0.01), while the difference between group B and group C was not significant.Conclusion: The difference in curative effect between the two formulations was not significant.Because of the adverse reactions of paroxetine, in the treatment of emotional disorder during perimenopause, the two formulations of Jiawei Xiaoyao Powder were worth to be recommended.国家自然科学青年基金项目(No.81302960)~

Simple Combustion Production and Characterization of Octahydro[60]fullerene with a Non-IPR C-60 Cage

1. Xiamen Univ, State Key Lab Phys Chem Solid Surface, Xiamen 361005, Peoples R China 2. Xiamen Univ, Dept Chem, Coll Chem & Chem Engn, Xiamen 361005, Peoples R China 3. Xiamen Univ, Sch Life Sci, Xiamen 361005, Peoples R ChinaFor the first time an easier, operable combustion method is employed for the synthesis of non-IPR fullerene, and an octahydro[60)fullerene with a non-IPA C-60 cage (C-60 isomer C-#1809(60)) produced by combustion is isolated and characterized by MS, UV vis, IR, and NMR spectroscopies in combination with DFT calculations. This finding shows that, in addition to chlorine, hydrogen can be an ample cataloreactant for the production of non-IPR fullerene derivatives under such conditions as arc-burning and diffusion combustion.NSFC 20525103 20673088 20973137 20721001 20423002 21031004 973 projects 2007CB815301 2007CB81530

Lithium Extraction Properties in Anode Material Li_2MgSi for Lithium Ion Batteries

使用基于平面波展开的第一原理赝势法,研究了锂离子电池负极材料Li2MgSi在各种脱锂量下的锂脱嵌形成能、相应的体积变化、能带结构、电子态密度以及电荷密度分布.计算结果表明:脱锂量越大需要的能量越大,随脱锂量的变化,平均一个锂的脱嵌形成能在-1.21--1.61 eV之间.脱锂过程中,体积先膨胀后收缩,整个过程中体积变化很大,是导致材料循环性能较差的重要原因.在脱锂过程中材料显示了由半导体性到金属性又到半导体性的特征.The ab initio pseudopotential method with the plane wave expansion of the crystal wavefunction is employed to study the anode material Li2MgSi for lithium ion batteries.The lithium deintercalation formation energies and the corresponding changes of crystal volumes under various amounts of lithium deintercalations are presented.The energy band structures and the electronic density of states and the charge densities for the lithium extractions in Li2MgSi are also discussed.The calculation results show that the more extractions of Li the more energies it needs.The deintercalation formation energies per lithium are between-1.21 eV to-1.61 eV for different amount of lithium extractions.The volume first expands then shrinks and the changes of volume are very big during the whole process.That is the important cause of bad cycle performance.And the material changes from semiconducting to metallic then to semiconducting crystal.福建省自然科学基金资助项目(E0410025

The reaction sequence of lithiation in Mg_2Ge and the changes of its electronic structure

Mg2Ge有望成为新的锂离子电池负极材料.使用基于平面波展开的第一性原理赝势法,计算并得到了Li嵌入Mg2Ge负极材料时的反应次序.Li首先占据其中的间隙位置,占满间隙位置后随着嵌Li量的进一步增加,Li将逐步替位Mg2Ge中一半的Mg位置,直到生成Li2MgGe.计算结果表明,在整个嵌Li过程中主体材料的体积先膨胀后收缩,体积胀缩量很大,这是导致Mg2Ge作为锂离子电池电极材料循环性能较差的重要原因.对材料电子结构的分析表明,随着Li嵌入量的增加,主体材料发生了从半导体性到金属性、又到半金属性的转化.Mg_2Ge is a promising new anode material for lithium ion batteries.The ab initio pseudopotential method with the plane wave expansion of the crystal wave function was employed to study the lithiation properties of anode material Mg_2Ge.The reaction sequence of lithiation in Mg_2Ge have been calculated.It was found that Li ions firstly occupy the interstitial sites until the interstitial sites are full,and then substitute the Mg sites until half of the Mg sites are replaced to form the phase of Li_2MgGe.The calculation results also show that the crystal volume firstly expands and then shrinks as the number of Li ions increases.The changes of crystal volume are very big during the whole process which is the cause of bad cycle performance of the material.The electronic structures are also analyzed,which indicates that the host material changes from semiconducting to metallic then to semiconducting with the increase of Li intercalations.国家自然科学基金(批准号:10774124);; 国家重点基础研究发展规划(批准号:2007CB209702);; 福建省自然科学基金(批准号:E0410025)资助的课题~

离子液体自模板合成多孔碳氮材料及其对二氧化碳的吸附

以多种氰基离子液体为前驱体,采用高温碳化法直接制备多孔碳氮材料,系统考察了离子液体前驱体阳离子结构、阴离子种类及合成条件等因素对碳化材料比表面积、氮元素含量及氮种类的影响,并研究其对CO2的吸附性能。结果表明,阴离子在聚合过程中起模板剂的作用。合成材料主要呈介孔结构,比表面积最高达732.6 m^2/g,氮含量最高为9.9wt%,在温度25℃、压力1.8 MPa条件下,CO2的吸附量最高达20.9wt%。多孔碳氮材料经180℃真空加热后可完全脱附再生,再生稳定性良好

离子液体自模板合成多孔碳氮材料及其对二氧化碳的吸附

以多种氰基离子液体为前驱体,采用高温碳化法直接制备多孔碳氮材料,系统考察了离子液体前驱体阳离子结构、阴离子种类及合成条件等因素对碳化材料比表面积、氮元素含量及氮种类的影响,并研究其对CO2的吸附性能。结果表明,阴离子在聚合过程中起模板剂的作用。合成材料主要呈介孔结构,比表面积最高达732.6 m^2/g,氮含量最高为9.9wt%,在温度25℃、压力1.8 MPa条件下,CO2的吸附量最高达20.9wt%。多孔碳氮材料经180℃真空加热后可完全脱附再生,再生稳定性良好

Computer Simulation on Li-Insertion Routes Based on First-Principles

为了研究锂离子电池负极材料InSb的L i嵌入过程,使用基于密度泛函理论的第一原理赝势法,计算了L i离子电池非碳类负极材料InSb在L i嵌入时的125相不同情况下的总能、平衡体积和各相间转换的L i嵌入形成能及相对体积变化等,进而参考电压轮廓实验曲线,筛选出了中间经历两相的最可能的反应路径为L i+In4Sb4→L i1In4Sb4,2L i+L i1In4Sb4→L i3In4Sb4,9L i+L i3In4Sb4→L i12Sb4+4 In;中间经历三相的最可能的反应路径为L i+In4Sb4→L i1In4Sb4,2L i+L i1In4Sb4→L i3In4Sb4,4L i+L i3In4Sb4→L i7In3Sb4+In,5L i+L i7In3Sb4→L i12Sb4+3 In。计算了L i3Sb的晶格常数、总能等,讨论了其能带结构和电子态密度等性质。结果表明:随着L i嵌入到InSb中并生成L i3Sb,其体积略有膨胀,材料发生了由半导体性到金属性又到半导体性的转变。In order to study the process of Li intercalations in InSb,an Ab initio method with the first-principles pseudo potentials based on the density functional theory was used to calculate the total energies,the equilibrium volumes of Li intercalations in InSb in 125 possible cases,the formation energies and the relative volume changes during the material changed from one phase to another.Comparing with the experimental voltage profile curve,we show that the most favored intercalation route for undergoing two intermediate phase is Li+In_4Sb_4 →Li_1In_4Sb_4,2Li+Li_1In_4Sb_4 →Li_3In_4Sb_4,9Li+Li_3In_4Sb_4 →Li_(12) Sb_4+4In,and the most favored route for undergoing three intermediate is Li+In_4Sb_4 →Li_1In_4Sb_4,2Li+Li_1In_4Sb_4 →Li_3In_4Sb_4,4Li+Li_3In_4Sb_4 →Li_7In_3Sb_4+In,5Li+Li_7In_3Sb_4 →Li_(12)Sb_4+3In.The lattice constant and total energy of Li_3Sb was also calculated.The band structures,electronic density of states for Li_3Sb were also discussed.The result shows that the volume slightly expands from InSb to Li_3Sb.The material changed from semiconducting to metallic then again to semiconducting.福建省自然科学基金计划资助项目(E0410025

Lithium Extraction Properties in Anode Material Li_(2.5)Cu_(0.5)N for Lithium Ion Batteries

使用基于平面波展开的第一原理赝势法,计算了锂离子电池非碳基负极材料Li2.5Cu0.5N在各种脱锂量下的Li脱嵌形成能以及相应的体积变化,讨论了脱锂前后材料的电荷密度,电子状态密度等电子性质.计算表明,Li2.5Cu0.5N晶体中LiN层的锂的脱出能要比LiCu层的锂小得多,即LiN层中的锂更容易脱嵌.结果还表明,各种脱锂量的Li脱嵌能大致在-2.72~-4.08 eV/Li之间.当脱锂量小于30%,材料的体积变化较小,随着脱锂量的增大,材料的体积变化较大.The ab initio pseudopotential method with the plane wave expansion of the crystal wavefunction was employed to study the non-carbon-basing anode material Li_(2.5)Cu_(0.5)N for lithium ion batteries.The lithium deintercalation formation energies and the corresponding changes of crystal volumes under various amounts of lithium deintercalations are presented.The charge densities and the electronic density of states for the lithium extraction in Li_(2.5)Cu_(0.5)N are also discussed.The calculation results show that the Li extraction in the LiN layer is much easier than that in the LiCu layer.The deintercalation formation energies per lithium are around-2.72 eV to-4.08 eV for different amount of lithium extracted.The changes of volume are small for lithium extraction at <30%,however,the changes are large when the extractions are further increased.国家自然科学基金(10374076);; 福建省自然科学基金(E0410025)资