An Empirical Study on the Impact of Venture Capital on the External Financing of NEEQ Listed Enterprises

新三板市场自2013年扩容以来，取得了突飞猛进的发展，挂牌企业数量增长迅猛，制度层面也不断完善。新三板系统的设立，丰富和完善了我国资本市场的层次，为中小企业的融资提供了新的渠道。中小企业普遍存在融资困难的问题，风险投资则是解决中小企业和创新型企业融资问题的重要力量。新三板系统的设立拓宽了风险投资的退出渠道，因而风险投资在新三板市场上的参与更加普遍。基于新三板市场上挂牌企业的特殊性，风险投资对于新三板挂牌企业融资能力的影响可能会与主板、中小板和创业板有所差异，因而研究风险投资对于新三板挂牌企业融资影响具有重要意义。 本文基于新三板扩容后的三年（2013-2015）的数据进行研究，分析了新三板市...Since the NEEQ (National equities exchange and quotations) is expanded in 2013,it has achieved rapid development in the number of listed enterprises and the legal system. The establishment of NEEQ make our multi-level capital market become more consummate and abundant, and it provides a new path for the financing of small and micro enterprises. Small and medium-sized enterprises have difficulties ...学位：管理学硕士院系专业：管理学院_企业管理学号：1762014115123

NUMERICAL ANALYSIS OF BOND-SLIP BEHAVIOR IN RC BEAMS BASED ON OPENSEES

粘结滑移性能的数值分析是钢筋混凝土结构研究的热点,该文在总结现有粘结滑移本构关系的基础上,采用分离式思想在OpenSees中建立粘结滑移精细化分析模型,并通过拉拔试件与RC梁构件的数值分析研究梁中钢筋与混凝土的粘结滑移作用,同时考虑箍筋量对构件滑移分布的影响。经过该文分析可知,该数值分析模型具有一定的合理性,能较准确的反映出粘结应力、滑移等分布的规律;通过梁构件数值分析可知,其整体性能受到粘结性能、钢筋滑移量大小及箍筋配置等的影响,箍筋的配置对构件局部滑移会产生一定的影响,但对滑移的整体分布影响并不显著。Many scholars have done a lot of research on bond-slip behavior in reinforced concrete structures. Besides experiments, numerical analysis is also important. In this paper, on the basis of summarizing bond-slip models nowadays, a refined model in OpenSees according to the method of discrete model is built and then the bond-slip behavior between rebar and concrete is studied through analyzing a pull-out specimen and RC beam component. The influence of stirrup on bond stress and slip distribution is considered. From the analytical results, it is found that the numerical model is reasonable to reflect the bond stress and its change law. At the same time the phenomena of beam simulation show that many factors have effects on its whole performance such as the bond stress, slip of rebar and ratio of stirrups which can affect the bond-slip distribution. The stirrups affect the slip in part of the beam but in general it has little effect.国家自然科学基金项目（51261120376,91315301-12

ELASTOPLASTIC NUMERICAL SUBSTRUCTURE METHOD OF REINFORCED CONCRETE FRAME STRUCTURES

大型复杂土木工程结构在地震作用下失效破坏可能由部分关键构件严重损伤破坏导致,而大部分构件仍处于弹性或小变形状态。该类结构的地震损伤和破坏全过程分析涉及超大规模系统强非线性动力分析,目前尚缺乏能很好兼顾效率和精度的计算理论,基于此,该文提出一种新型高效且实用的弹塑性数值子结构理论和计算方法,将大型复杂结构系统的大规模非线性计算问题转化为整体结构适度规模的线弹性分析和数量与规模均较小的局部隔离子结构非线性分析,其中,线弹性整体结构刚度矩阵的集成及LU三角分解仅需进行一次,大大提高计算效率;少数屈服构件的子结构非线性分析采用精细化有限元模型或不同类型单元模型,精确模拟构件局部损伤破坏机理,有效提高结构整体的计算精度。最后通过对一榀平面钢筋混凝土框架结构进行地震动力弹塑性数值子结构方法分析,验证其高效性与精确性。During the seismic process of earthquakes, larger-scale civil engineering structures might fail due to the serious damage to some key structural members, whereas most structural components might remain elastic and experience small deformation. It is a challenging task to simulate the behavior of such structural systems due to the trade-off between computational efficiency and numerical accuracy. This paper presents an efficient and practical elastoplastic numerical substructure method, in which the whole structural seismic analysis is divided into linear elastic analysis of a master structure and nonlinear analysis of limited numbers of small-scale substructures, to balance the computational efficiency and numerical accuracy. During the linear elastic analysis of the master structure, the formation and LU triangular decomposition need to be done only once as the equivalent stiffness matrix remains constant, resulting in high computational efficiency of the master structure. Rational or refined models can be used in substructure systems to model the local damage mechanism, improving the numerical accuracy of the whole structure. Seismic analysis of a reinforced concrete frame structure is performed to verify the novel numerical substructure method.国家自然科学基金项目(51261120376;91315301-12

考虑P-⊿效应的框架结构弹塑性数值子结构分析

几何非线性是土木工程结构在强震作用下动力时程分析过程中必要的考虑因素。该文基于数值子结构方法,结合平面Euler-Bernoulli梁柱单元的几何大变形理论,将平面框架结构的非线性分析转化为线弹性主结构的弹性分析,并提出材料和几何非线性修正力项,作为等效为外荷载项施加于主结构以考虑结构的双非线性。最后,对一平面钢框架结构进行地震动力时程分析,分析结果表明考虑了双非线性的数值子结构方法具有良好的精确性与高效性;同时,几何非线性对结构动力响应具有重要影响。国家自然科学基金项目(51261120376;91315301-12

REFINED ASEISMIC ANALYSIS OF LOW-DUCTILITY RC FRAME BUILDING BASED ON NUMERICAL SUBSTRUCTURE METHOD

该文以钢筋混凝土低延性框架结构为分析对象,总结该类结构及相关构件数值分析研究现状;基于桁架模型研究柱及节点组合体等关键构件的精细模型化思路与方法,并分别采用试验予以验证;以此为基础,借助在Open Sees软件中开发的数值子结构方法及平台,以汶川地震中严重受损的多层钢筋混凝土框架结构为对象建立精细化数值子结构模型,通过局部构件的精细分析研究其在强震作用下的抗震性能及失效模式。经该文研究表明采用桁架模型建立易于发生脆性破坏的柱及节点组合体等关键构件的精细化模型合理且准确;选择数值稳定且更适用的精细化模型与数值子结构平台分析涉及不同类型且易发生脆性破坏的低延性结构更具优势;针对低延性框架,不宜采用位移角限值作为结构性能评估的唯一判断依据,在分析中需考虑未达到目标位移前结构可能发生的脆性破坏模式。This paper firstly provides a short summary on the current research status on the numerical studying of low-ductility reinforced concrete （RC） frames and their related components, such as columns and joint subassemblages. Then detailed numerical modeling approaches of these key components using a truss model are provided and evaluated using several experiments. Finally, a numerical substructure method （NSM） developed in OpenSees is employed to build the detailed substructure model for analyzing a damaged RC frame subjected to Wenchuan Earthquake, and its aseismic performance and failure mode are studied in a detailed way according to the local performance. This study indicates that： the truss model performs well in simulating the nonlinear behaviors of columns and joints, especially to predict the brittle failures; numerical substructure method has great advantages, such as good numerical stability and applicable refined models, to study the performance of low-ductility RC structures; from the analytical results ofdarnaged RC frame, it can be found that displacement or inter-story drift should not be the only criterion to evaluate the low-ductility structures, and instead the possible brittle failures must be considered in the aseismic analysis.国家自然科学基金项目（51261120376,91315301-12

First Arrival Picking Based on Image Processing Methods

摘要:地震波初至时间的检测是地震信号处理中的一个重要环节。在地震波接收记录上 ,初至波振幅大于噪声振幅 ,初 至时间位于纯噪声信号与地震有效信号和噪声之叠加信号之间的分界处。根据这些特征 ,本文把地震信号幅值数据处 理成 256级灰度图 ,再把灰度图二值化 ,然后通过检测二值图像的边缘 ,获得地震波的初至时刻。对于存在较多的连续 异常记录道 ,或其它强干扰信号的地震波记录 ,提出了二次或多次用不同阈值对图像进行二值化的检测方法。对实际地 震记录的处理表明 ,本文方法具有较高的精度和效率。Abstract: This paper discusses a new method of first arrival p icking . The method is based on i mage p rocessingmethods . It is p ro2 posed for the purpose of aut omatic and accurate p icking of large v olumes of first arrival p icks for refracti on static analysis . The first step converts the seismic data int o a grey i mage . The second step converts the grey scale i mage t o a binary i mage . At last si mp le secondary p ick l ogic can be emp l oyed t o calculate a final p ick ti me . In the course of p icking, the paper discusses a new method t o influence the accuracy of p icking first arrival, converts the grey scale i mage t o more than 2 binary i mages by different threshold value . The experi mentati on has p r oven that the new method has great speed and efficiency .基金项目:福建省自然科学基金资助项目 (2006J0044) ;厦门大学 985二期信息创新平台项

米氏凯伦藻细胞表面膜蛋白质组及其对温度变化的响应研究

米氏凯伦藻(Karenia mikimotoi)近年在我国福建、浙江和广东沿海经常形成赤潮,其赤潮不仅影响到海洋生态系统的稳定,也严重威胁到水产养殖以及人类生命健康安全。本论文以米氏凯伦藻为研究对..

基于最优组合赋权模糊物元模型的节水灌溉项目综合评价

在总结现有研究与评价方法的基础上,构建了基于最优组合赋权模糊物元模型的节水灌溉项目评价模型。首先,采用G1法和改进熵权法确定指标的主客观权重;然后,运用最小鉴别信息原理进行组合赋权,得到兼顾主客观因素的权重。其次,利用物元可拓法和理想解法求解理想模糊物元和负理想模糊物元,并根据欧式范数计算确定各评价对象的相对关联度。最后,通过在某地区节水灌溉项目投资决策的实例分析,验证了所提方法的可行性和有效性。贵州省科学技术基金项目(黔科合J字LKLS[2013]32号);;贵州省教育厅高校自然科学研究项目(黔教合KY字[2016]271号、103号、265号,黔教合KY字[2017]260号);贵州省教育厅高校人文社会科学研究项目(2016gh03);;贵州省高等学校教学质量与教学改革项目(GZSJG10977201608,GZSJG10977201603,GZSJG10977201508,GZSJG10977201505);;六盘水师范学院自然科学科研计划项目(LPSSY201502、201605);六盘水师范学院大学生项目(LPSSYDXS1602、17036、17037);六盘水..

胆囊旁和近结肠肝脏组织的射频消融

【目的】在活体上观察多极射频消融电极展开不同直径、消融时间与组织坏死的关系，并评价消融区域组织坏死程度，分别了解在近胆囊和结肠肝曲部位肝脏消融对胆囊和结肠的影响。【方法】家猪6只，体质量（47±2．5）kg。静脉麻醉，每肝内分为5个位点进行射频消融。其中2组将消融电极展开到3cm。每组5个点分别行5min和10min消融，包括距离胆囊床（5±1）mm，行10min射频消融；距离结肠肝曲（5±1）mm处，行10min射频消融，并观察消融结果。另3组电极展开到5cm，每组5个点分别行5min、10min和15min组织间消融。【结果】消融电极展开到3cm行5min治疗组。5个点局部消融区域组织达到完全坏死；10min×5min消融治疗坏死范围相似。大体病理上消融相邻区域胆囊。结肠未见有坏死，镜下病理显示胆囊壁、结肠周围有慢性炎症并有纤维增生表现。消融电极展开到5cm。5min消融组织间有活性成分。15min，10min均可保证消融区域完全坏死。【结论】可根据需要调整多极消融电极展开大小，在肝内接近胆囊区域、结肠肝曲部位消融安全，可发挥较好的作用

知情交易、信息不确定性与股票风险溢价

基于VPIN指标度量沪深300成分股的知情交易程度,并检验其定价效应及其与信息不确定性的交互作用.实证结果表明:1) VPIN可以通过提高买卖价差影响市场的流动性风险,并带来显著的横截面和时序上的风险溢价; 2) VPIN对风险溢价的解释能力优于信息不确定性因子,而信息不确定性对知情交易具有同向调节作用; 3)当对个股的信息不确定性、规模、动量以及变量之间的交互作用进行控制后,VPIN的定价效果依然显著存在.与此同时,Fama-Macbeth分析结果还表明,VPIN与传统风险因子不存在内生性问题,也不是传统风险因子的替代变量; 4)在公司发布各类重大公告前都存在显著的异常风险溢价和异常交易量,而上述异常值可以被同步出现的异常VPIN值所解释.国家社会科学基金资助项目(16BJL028);;\n国家自然科学基金资助项目(71471154; 71771193; 71571153);;\n中国博士后科学基金资助项目(2017M622670);;\n中央高校基金科研专项(2072017002