The Research on the Shareholder Wealth Effect of the Private Placement in the Neeq of China

2013年新三板市场扩容至全国范围，短短几年内新三板市场挂牌的企业数量已超过万家，成为我国多层次资本市场的重要组成部分。为了解决挂牌企业融资的问题，新三板市场借鉴A股市场，将定向增发引入挂牌公司，与上市公司实施定向增发相比，挂牌公司实施定向增发的条件更为宽松、手续更加简便，极大满足了挂牌公司融资难、融资贵的问题。从2015年起，新三板市场已经完成6，738次定向增发，累计为挂牌公司募集资金3，171.85亿元，成为新三板挂牌公司融资的主要渠道，极大程度上满足了新三板挂牌公司融资的需求。本文通过研究新三板定向增发的股东财富效应能够为挂牌公司、投资者实现利益最大化、为监管机构制定符合市场规律的规章...2013 neeq expansion to a nationwide, just a few years neeq market listing number of enterprises has more than 10,000, as China's multi-level capital market an important part. In order to solve the problem of financing listed companies, neeq market draws on the A-share market, will be introduced into the listed companies, and listed companies to implement private placement compared to listed compan...学位：经济学硕士院系专业：经济学院_金融学学号：K124209

Nitrogen transports and transformations in the Wuchuan headwater stream

利用氮稳定同位素法、综合常规水样监测以及微环境培养方法探讨了五川农业溪流沿程氮的迁移转化过程。结果表明,溪流沿程nO3-n浓度变化范围为0.5--4.5 Mg l-1,平均为1.26 Mg l-1,且多数月份总体上呈逐渐升高的趋势,同时nO-3的δ15n存在降低趋势,两者呈线性负相关(r2>0.80),表现明显的硝化过程典型特征。各采样点的nO2-n、dO、dOC浓度与nO3-n也存在一定的线性相关关系,说明了硝化过程的发生和氮在不同形态之间的转化。溪流水体微环境培养实验证明了水体中的nH4-n和nO3-n浓度在培养期内并无明显变化,以上数据和相关关系充分表明了流域沿程地表径流氮素输入和溪流系统沉积物和水体界面的硝化过程共同作用可能是五川溪流沿程nO3-n与nH4-n浓度升高,而nO-3的δ15n值减小的主要原因。因此,在农业流域的污染源评价中,需要重新审视和调查河道系统内部氮的转化和贡献。Nitrogen isotope and traditional water sampling,together with microcosm incubations were used to investigate processes of nitrogen downstream transports and transformations within the Wuchuan stream.Results showed NO3-N concentrations varied downstream ranging from 0.5 to 4.5 mg L-1 for most of sampling months with a mean of 1.26 mg L-1 in the stream.However,nitrate isotope δ15N decreased downstream,comparing to increased trend in NO3-N concentration.The relationship between downstream NO3-N concentrations and nitrate δ15N with a R2 exceeding 0.8 can be characterized as a typical process of nitrification.The relationships between NO3-N concentrations and NO2-N,dissolved oxygen,dissolved organic carbon concentrations for the sampling sites also indicated strong nitrification processes and consequent nitrogen transformations between nitrogen forms in the stream.Microcosm study of surface water from the stream showed that no significant change in NH4-N and NO3-N concentrations occurred during the five-day incubations.All the information and relationships showed that the downstream increases in NH4-N and NO3-N concentrations, and the downstream decreases in nitrate δ15N within the stream obviously resulted from the nitrogen input from surface runoff flowing into the channel,and also nitrogen transformations by nitrification occurred between stream sediment and overlying water within the channel.Therefore,it is essential to take the sources from nitrogen transformations within streams into account and to evaluate their contributions in pollution assessments at catchment scales.国家自然科学基金资助项目(40671116);福建省自然科学基金重点资助项目(D0720002);国家教育部新世纪优秀人才支持计划资助项目;福建省高校新世纪优秀人才支持计划资助项目;厦门市科技计划指导性资助项目(3502Z20077014

大连极紫外相干光源

先进光源的发展在前沿科学研究中发挥的作用越来越重要。近十年来,飞速发展的自由电子激光技术为科学家们提供了探索未知世界、发现新科学规律和实现技术变革的重要工具。建成的大连极紫外(EUV)相干光源的运行波段为50~150nm,单脉冲能量大于100μJ,且可提供10-12 s和10-13 s量级的超快激光脉冲,是我国第一台自由电子激光用户装置,并且是国际上唯一运行在极紫外波段的自由电子激光用户装置,在世界范围内为用户提供具有高峰值亮度和超短脉冲的极紫外激光。大连EUV相干光源是由国家自然科学基金委资助、由中国科学院大连化学物理研究所和上海应用物理研究所共同承担的重大科学仪器研制项目,目标是打造一个以先进极紫外光源为核心、主要用于能源基础科学研究的光子科学平台