Can Export Inhibit the Price-cost Markups of Chinese Enterprises?An Empirical Study Using the Industrial Enterprises Data of China

从量上来说，当前中国已经是世界上第一出口大国，但却难以称之为出口强国。中国企业的出口存在一个奇怪的现象：出口产品的价格大多低于国内产品价格，这并不符合国际贸易理论的基本观点。因此，本文基于1998—2007年中国工业企业的微观平衡面板数据，提出了两个研究假设，尝试从微观企业层面的视角来对这一现象进行研究，并提出政策建议。 首先，本文提出了研究假设一，即中国出口企业存在“加成率悖论”。针对这一研究假设，本文通过构建Heckman两阶段模型进行计量回归分析。研究发现所谓的“加成率悖论”确实是普遍存在的。主要结论如下：（1）中国工业企业确实存在“加成率悖论”，即出口企业的成本加成率小于非出口企业；...Quantitatively, China is already the world's biggest exporter, but it is difficult to call it the powerful exporter qualitatively. There is a strange phenomenon in China's export enterprises: prices of export products are far below that of domestic products, which does not meet the basic ideas of international trade theory. Based on the Chinese industrial enterprises balanced panel data from 1998 ...学位：经济学硕士院系专业：经济学院_国际贸易学学号：1572012115184

The Synthesis of Block Copolymers with Reversible Addition-Fragmentation Chain Transfer Polymerization

利用RAFT聚合技术可以在温和条件下合成结构可控的聚合物，如嵌段，接枝，星型，树枝状，支化及超支化等结构的聚合物。其中两亲性嵌段结构的共聚物以其独特结构在油墨润湿剂，涂料分散剂等工业领域有着较广泛的应用，并且其在一定条件下形成的球形，棒状，囊泡等不同形态和结构的聚集体也使之在材料制备、纳米技术、药物输运等高新技术领域具有良好的应用前景。RAFT聚合技术近年来已成为制备两亲性嵌段共聚物的重要技术。 国内外一些研究者已作了类似的研究，但他们重点研究了嵌段共聚物的自组装行为和其在实际中如药物缓释等的应用。本论文重点研究RAFT聚合对相对分子质量大小的控制性，目的在于合成预设相对分子质量的聚合物，...Polymers of controllable structure can be synthesized under mild conditions by using RAFT polymerization technology, such as polymers, grafting polymers, star polymers, dentrites polymers, branched polymers and hyperbranched polymers, etc. Amphiphilic block copolymers with its unique structure have the widespread application in the printing ink wetting agents area and coating dispersant industrial...学位：理学硕士院系专业：材料学院材料科学与工程系_高分子化学与物理学号：2072009115006

Research and Application of the Unified Software Lifecycle Platform Technology

随着外资银行的进入，中国银行业的市场竞争不断加剧。如何快速交付一个高质量、让最终用户满意的金融产品系统，已成为能否占领市场先机的重要因素。为达到此目标，需要更为有效地进行银行软件开发项目的监控与管理。 随着银行软件开发团队规模的逐步扩大，系统可利用资源也日益增多。如何高效地利系统资源，是企业当前面临的重要问题。统一软件生命周期平台作为提高系统资源整合的重要技术，是基于持续集成方法的软件生命周期管理技术研究的应用平台，它是以任务管理为中心，以需求为开发索引的统一变更管理平台。该平台以开发和测试模式为基础，实现多个生命周期不同阶段工具平台的集成，从而提高企业的生产力，有效降低企业运营成本和市场竞...Along with the foreign banks entering, the market competition of the Chinese banking became bigger and bigger continuously. How to deliver a high quality system that can satisfy the end-user fast has become an important factor to seize the earlier chance of market for us. In order to meet the need, we have to conduct the software development and management research for the project software devel...学位：工程硕士院系专业：软件学院_工程硕士(软件工程)学号：X200723003

Modeling Influence of Temperature and Salinity on Growth Rate of Larva in Noble Scallop,Chlamys nobilis(Reeve) by Response Surface Methodology(RSM)

采用中心复合设计(CEnTrAl COMPOSITE dESIgn,CCd)的试验设计法研究了温度和盐度2个环境因子对华贵栉孔扇贝幼虫生长的影响。同时采用响应曲面分析法及基于响应曲面基础之上的满意度函数法确立了生长的二次回归方程,同时进行优化处理得到温度与盐度的最佳组合。结果表明,在华贵栉孔扇贝幼虫生长过程中温度与盐度在一定的范围内的互作效应不显著,其中温度效应较为明显。温度对壳长瞬时生长影响的一次项效应和二次项效应均达到显著水平(P<0.000 1)。盐度对壳长瞬时生长影响一次项效应显著(P<0.000 1),然而,盐度对壳长瞬时生长影响的二次项效应达到显著水平(P<0.000 1)。分析响应曲面法优化温度和盐度对华贵栉孔扇贝幼虫壳长瞬时生长率的影响,其结果显示最佳温度与盐度组合为25.33℃与29.42‰,此条件下瞬时生长率为7.91%,其满意度函数值达到85.57%。在生产实践中,严格控制温度和盐度范围,使其在最优值范围内,将会显著提高苗种生产效率。In this study,the combined effects of temperature and salinity on the instantaneous growth rate(IGR) of larva in noble scallop,Chlamys nobilis,was evaluated using the central composite orthogonal quadratic design and the response surface methodology.The results showed that the linear effects of temperature on IGR was statistically highly significant(P<0.000 1);the linear effects of salinity on IGR was significant(P<0.000 1).The interactions between temperature and salinity on IGR was not significant;the quadratic effects of temperature and salinity on the IGR was highly significant(P<0.000 1);temperature was more important in influencing growth of larvaof C.nobilis.By applying the simultaneous optimization technique,the optimum factor combination,i.e.,25.33 ℃ and 29.42‰ was found out,at which the optimal IGR(7.91%)arrived simultaneously,with the desirability value as high as 85.57 %.It is anticipated that application of the optimal temperature-salinity combination to practice would improve the productive efficiency of C.nobilis.国家自然科学基金(31160528); 国家海洋公益性行业科研专项(201405020-5); 海洋公益专项科研基金(201205021); 南海生物资源开发与利用协同创新中

“化学拔尖计划”“强化实验”课程平台建设与实践

介绍了厦门大学专门为"化学学科拔尖学生培养试验计划"学生个性化培养"量身定制"的"强化实验"课程建设的基本思路、实验内容设计、"动态"教材建设与教学实践情况。以期更好地为高校化学实验教学改革提供适应面广、操作性强的可借鉴经验,也为今后更好地实施"化学学科拔尖学生培养计划"2.0提供参考。2016年度教育部“基础学科拔尖学生培养试验计划”研究课题2017年福建省本科高校教育教学改革研究项目(FBJG20170295)2017年度厦门大学教学改革研究项目(JG20170204)国家基础科学人才培养基金项目(J1310024

海洋胶体中的氮、磷和铁对微藻生长的效应

利用错流超滤技术提取海洋胶体,研究了无氮、无磷和无铁的营养介质中海洋胶体对海水小球藻、亚心形扁藻和球等鞭金藻生长的影响。结果表明,在胶体有机碳(COC)浓度为0～238.4μmol/L的范围内,3种微藻在以胶体为N源的介质中的平均相对增长率Y分别为20.7％～44.0％,80.1％～110.1％和68.6％～106.2％;在以胶体为P源的介质中的Y值分别为19.3％～43.2％,78.3％～156.7％和77.9％～115.3％。3种微藻的Y值随COC浓度增大呈下降趋势。3种微藻在以胶体为Fe源的介质中的Y值分别为12.7％～35.3％,171.7％～266.3％和400.5％～498.8％,3种微藻的Y值随COC浓度增大呈线性上升。这意味着海洋胶体中存在微藻生长必需的N,P和Fe营养,对微藻的生长有显著的刺激作用。胶体中的Fe营养对球等鞭金藻和亚心形扁藻的效应比N和P营养的约大6～7倍,而胶体中的N和P营养对小球藻的促进作用则约比Fe的大3倍。国家教育部高等学校骨干教师计划基

矩阵与其方幂相似的进一步讨论及应用

证明了如果矩阵A的所有特征值都是1,则对任意非零整数k,A~k与A相似,并给出了A与A~k(k∈Z~+)相似的一些充分必要条件.作为应用,证明了一类非线性矩阵方程解的存在性

Effect of the trans - theoretical model of behavior based WeChat health education on self - management among patients with maintenance hemodialysis

目的 探讨基于行为转变的微信干预模式对维持性血液透析患者自我管理的研究效果.方法 选取60例维持性血液透析患者实施微信健康教育,健康教育方案是基于行为转变理论制订,包括血液透析专业知识、自我管理、科学饮食等方面内容.实施干预12周后,对患者的生化指标、自我管理水平及自我效能感得分进行干预前后比较.结果 干预后患者自我管理得分较干预前有显著提升,表现在情绪处理和自我护理方面,差异有统计学意义（P＜0.01）.干预后患者的生化指标白蛋白、血钾、肌酐、尿素氮的差异有统计学意义（P＜0.01）.患者的自我效能感提升.结论 基于行为转变理论的微信健康教育可以改善维持性血液透析患者的生化指标,提高自我管理水平,帮助患者了解血液透析知识以及提升自信心,为今后改善血液透析患者自我管理提供一种新的干预模式.Objective To explore the effect of WeChat intervention model based on the trans-theoretical model of behavior（TTMB） on self-management of maintenance hemodialysis patients.Methods Sixty cases of maintenance hemodialysis patients were given WeChat health education,and the health education program was based on TTMB,ineluding hemodialysis expertise,self-management,scientific diet and so on.After 12 weeks＇intervention,the biochemical index,the self-management level and the self-efficacy score of patients were compared before and after intervention.Results The scores of self-management of patients after intervention were significantly higher than those before intervention,which were expressed in terms of emotional management and self-care,and the difference was statistically significant （P 〈 0.01）.After the intervention,the biochemical indexes diffences of albumin,serum potassium,creatinine and urea nitrogen of patients were statistically significant （P 〈 0.01）.The self-efficacy of patients were elevated.Conclusion The TTMB WeChat health education can improve the biochemical indexes and the level of self-management of maintenance hemodialysis patients,and it helps patients to understand hemodialysis knowledge as well as improve self-confident,to provide a new intervention model for improving self-management of hemodialysis patients in the future.国家自然科学基金（71403232

Biological fixed nitrogen of Tokin Gulf in winter

2006年12月至2007年1月(冬季)期间,对北部湾海区的生物固氮作用进行了初步研究,结果表明:当培养时间为2 H时,水体浮游生物固氮速率最高,且固氮速率随着培养时间的延长而逐渐降低。北部湾冬季固氮速率存在周日变化,8∶10~11∶10时段内固氮速率达到最高值。10 M和30 M水深在夜间仍能检测到固氮活性,这可能是浮游生物昼夜垂直移动引起的。北部湾冬季固氮速率的范围为447.5~1447.2 PMOl/(l.H),固氮速率呈现出从湾内往湾外不断增加的趋势,湾口海区(b06站)的积分固氮速率为319.5μMOl/(M2.d)。b06站fE加富实验表明,添加100 nMOl/l fE能够明显促进生物固氮作用,北部湾冬季湾口海区生物固氮作用可能受到fE限制。The biological nitrogen fixation rates were investigated in Tokin Gulf waters in winter from Dec.2006 to Jan.2007.The nitrogen fixation rates were decreased as extension of culture time,the optimal culture time was 2 h.The nitrogen fixation rates showed diurnal variations,the highest nitrogen fixation rate appeared at 8∶ 10--11∶ 10,the diazotrophs still have the nitrogen fixation activity during the night at the depths of 10 m and 30 m,which may result from the diurnal migration of planktons.The nitrogen fixation rates ranged from 447.5 pmol/(L·h) to 1 447.2 pmol/(L·h) of Tokin Gulf waters in winter.Which showed a longitudinally increasing trend,the integral nitrogen fixation rate at station B06 was 319.5 μmol/(m2·d).The iron enrichment experiment at the mouth of the bay(B06) showed that the biological nitrogen fixation significantly promoted by adding iron concentration of 100 nmol/L.The biological nitrogen fixation rates at the bay mouth might be iron limited.国家自然科学基金重大研究计划重点项目资助(90411016);国家教育部高等学校骨干教师计划基金资助项

近40年北太平洋亚热带环流区生态系变化的~(226)Ra证据

利用1999年7～10月和2003年10～12月实测的北太平洋亚热带环流区表层水~(226)Ra含量,结合文献所报道的历史数据,发现自20世纪60年代至今,北太平洋亚热带环流区表层水体~(226)Ra含量呈下降趋势,反映出全球变化导致该海域生态系结构的变化.全球增暖一方面导致了该海域水体层化作用的加强,进而导致上层水体Ra补充量的减少;另一方面,全球增暖导致海域生物生产力的升高,进而导致Ra迁出量的增加.~(226)Ra含量的上述变化与文献报道的该海域叶绿素a、硅酸盐、磷酸盐含量与初级生产力的历史变化趋势相吻合,确证北太平洋亚热带环流区在全球变化背景下正发生着可观测的生态系统变化.在上层海洋层化作用加强的情况下,为维持海域升高的生物生产力,其“新”氮可能的来源是海洋的固氮作用