6，7-二甲氧基香豆素的合成工艺改进

利用蒙脱土(MMT)的阳离子交换特性,将十二烷基三甲基氯化铵(BS-12)引入蒙脱土层间,对蒙脱土进行有机化预处理,使蒙脱土在甲基丙烯酸甲酯(MMA)中的分散性提高。借助普通乳液聚合的方法,制备出聚甲基丙烯酸甲酯(PMMA)/蒙脱土嵌入混杂材料。对混杂材料进行XRD分析,结果表明PMMA嵌入了蒙脱土层间,使层间距明显扩大。采用熔融共混的方法制备了PVC/蒙脱土复合材料,并对其强度和韧性进行了研究。结果表明,聚甲基丙烯酸甲酯/蒙脱土嵌入混杂材料可使PVC的强度和韧性分别提高17%和489.2%。     

一类非线性常微分方程边值问题解的存在性

采用三层加密技术,即在用户IE客户端,使用VB脚本对用户提交的信息进行第1层加密;在网站服务器端,使用ASP函数进行第2层加密;在数据库服务器端,使用SQL自定义函数,对进入数据库的信息进行第3层加密,开发了《上海电视大学教务管理系统分校版》管理软件,并进行了实际应用。     

小样品量比色管过硫酸钾消解法测定总磷的研究

针对标准过硫酸钾消解测定总磷采用50mL比色管、耗时长且消耗大量实验药品的问题,提出了用25mL比色管进行消解测定。通过空白值、重现性、相关系数及加标回收率几方面与标准方法进行比较,25mL比色管测得的标准曲线y=1.5173x+1.20×10-3,相关系数为0.9998,加标回收率在98.4%～104.1%之间,与标准方法使用的50mL比色管测得的值无显著性差异。实验表明该法简便快速、节约成本、准确可靠。     

不同引发剂引发苯乙烯/丙烯酸丁酯微乳液共聚合竞聚率的研究

以十二烷基硫酸钠/十二烷基苯磺酸钠(SDS/SDBS)为复合乳化剂,分别以水溶性引发剂过硫酸钾(KPS)、油溶性引发剂过氧化苯甲酰(BPO)和氧化-还原引发体系K₂S₂O₈/Na₂SO₃(OR)引发苯乙烯/丙烯酸丁酯(St/BA)微乳液聚合反应,研究了St/BA微乳液共聚合行为,用红外光谱法定量测定了3种引发剂下的共聚物化学组成,绘制了共聚物组成曲线,计算出了竞聚率。     

基于农民人力资本视角的中国农民收入增长宏观分析框架

提高农民收入是目前十分重要而紧迫的一项任务,而制度供给对于农民收入的增加是边际绩效递减的。长期来看,从农业及农村内部去解决农民增收问题可能性越来越小。指出了农民自身素质即农民人力资本是认识和解决农民收入问题的切入点,并试图在制度供给因素之外,建立起农民人力资本这个长期的影响因子与中国农民收入间的联系。     

从商业银行的视野看《物权法》的影响

《物权法》的出台和实施，是我国深化改革开放、进一步适应发展社会主义市场经济要求的标志，《物权法》在明确物的归属、保护权利人的物权、鼓励物的利用和发挥物的效用方面进行了有益的探索和创新。作者从正反两个方面探讨了《物权法》对商业银行经营管理的影响，既肯定了其有利于维护银行权益的一面，同时也揭示了目前我国配套法规尚不完善的情况，提出了应该予以关注的问题，对商业银行维护自身权益，防范法律风险，进行了深入的探讨。     

Why Do Companies Go Public? An Empirical Analysis

Using a large database of private firms in Italy, we analyze the determinants of initial public offerings (IPOs) by comparing the ex ante and ex post characteristics of IPOs with those of private firms. The likelihood of an IPO is increasing in the company's size and the industry's market-to-book ratio. Companies appear to go public not to finance future investments and growth, but to rebalance their accounts after high investment and growth. IPOs are also followed by lower cost of credit and increased turnover in control.     

The life and death of the Australian permanent building societies

Throughout the nineteenth and twentieth centuries permanent building societies have been important providers of housing finance in Australia. Despite their long history Australian building societies have been disappearing at a steady rate since the early 1980s as they have converted into banks or become involved in mergers. The purpose of this paper is to give a background account of the history of Australian building societies and put forward explanations for their past popularity and more recent disappearance from Australian housing finance markets.     

Overview of radio fuze failure mechanism researches under energy type interference

According to the characteristics of the energy type interference signal,this paper summarizes the researches on radio fuze failure mechanism under the energy type interference at home and abroad,including the development of strong electromagnetic pulse(EMP) weapons,the research of damage mechanism,the strong EMP weapon protection,and the fuze electromagnetic environmental adaptability test standard,analyzes the problems existing in the present research,and proposes corresponding countermeasures.The results provide a reference for further research of fuze.