永久/暂时模型及信息分享模型下交叉上市公司价格发现研究——基于A+H股上市公司的实证检验

根据Gonzalo和Granger(1995)的永久/暂时模型(Permanent/Transitory)及Hasbrouk(1995)的信息分享模型(Information Share),以同时在A股市场和H股市场交叉上市的公司为研究对象,就A股市场和H股市场的价格发现能力进行了评估。实证结果表明:虽然A股、H股价格存在差异,但是两者的变动存在协整关系且相互进行调整;就价格发现能力来看,A股、H股市场都发挥了重要作用,但是A股市场的贡献要高于H股市场。     

股本规模、涨跌幅限制与磁石效应——基于沪深A股市场高频数据的实证研究

基于CRTT模型,运用广义矩估计（GMM）方法,依股本规模分类对沪深A股市场进行实证分析。结果表明：沪深A股市场的涨跌幅限制存在显著的磁石效应。大规模、小规模股票磁石效应更为明显;中等规模股票磁石效应具有一定的对称特征。我国的涨跌幅限制应取更灵活的幅度限制,以促进股市的平稳健康发展。     

Downtown Elementary School （DES）： The unique school that juxtaposes both magnet and professional development school （PDS） programs

The objective of this paper is to explore the operation of magnet and professional development school （PDS） programs in a real life situation using an ethnographic study of Downtown Elementary School （DES-a pseudonym） that simultaneously operates as a PDS and a magnet school. The author spent almost three years at DES, located in the Southern United States, collecting data through participant observation, interviewing, and document collection. The purpose is to provide answers to compelling questions such as： What does it mean to have both magnet and PDS programs operating simultaneously in the same school as in the case of DES？ What can be learned from the experiences of the unique school-DES？ The paper provides an outline of both magnet and PDS programs and their operations at DES and analyzes how these programs are interrelated and intertwined. Some of the outcomes indicate that DES is about the only school in its locality that juxtaposes two innovative school reform programs. These programs impede each other＇s progress sometimes and in some cases feed off each other. There is a lot to be learned from the unique experiences of DES. Coupled with other conclusions, the author concludes that, PDSs, as school restructuring projects are intertwined with magnet schools＇ reform activity which is motivated by the drive to provide equity of opportunity to learn, particularly for poor, minority and black students in mostly urban areas who are at a disadvantage for various reasons. The final section of the paper takes a critical look at the issues at stake through the lens of critical multiculturalism.     

大学生英语作文中错误僵化现象探究

通过对英语专业三个年级的699份同一作文题目下的语言错误的统计分析和师生的半结构化访谈,研究发现：（1）书面语错误僵化的原因之一与特殊的＂一年级现象＂有关;（2）三年大学教学难以改变的僵化错误主要分布在第二类语言项目（ILI2）和第三类语言项目（ILI3）;（3）化解僵化错误需要在课程设置、教师配备和教学方法方面根据学生实际情况做出调整和创新安排,保证足够多的各种渠道L2语言材料的输入、大量的巩固练习和正确的纠错意识以达到学生对英语语言参数的自动设置和重置。     

十六大报告关于教育论述的新亮点

党的十六大报告关于教育问题的论述内容丰富意义深远。本文以十四、十五大报告对教育的论述为参照,以十六大报告为原始文本,对十六大报告关于教育论述中的新教育方针,构建终身教育体系、支持农村教育、完善“资困”政策和制度。素质教育与创新等五个亮点问题进行了具体的阐述。     

Analytical solutions for the two-dimensional magnetic fields in disc-type permanent magnet machines

Ｍａｇｎｅｔｉｃ Ｆｉｅｌｄｓ ｉｎ Ｄｉｓｃ－Ｔｙｐｅ Ｐｅｒｍａｎｅｎｔ Ｍａｇｎｅｔ ＭａｃｈｉｎｅｓTX１ＩｎｔｒｏｄｕｃｔｉｏｎＡｔｗｏ－ｄｉｍｅｎｓｉｏｎａｌ（２Ｄ）ａｎａｌｙｔｉｃａｌｍｅｔｈｏｄｆｏｒｃｏｍ－ｐｕｔｉｎｇｔｈｅａｘｉａｌ...     

重庆市农村居民收入影响消费的实证分析

以弗里德曼的持久性收入假说为理论基础,利用重庆统计数据,分析收入及收入结构对重庆市农村居民消费需求的影响。研究表明,从整体层面分析,持久性收入及其边际消费倾向对农民消费影响最显著,提高持久性收入对农民的消费支出有正的影响;从收入结构分析,农民人均工资性收入和家庭经营收入对消费的影响非常显著,提高农民的工资性收入和家庭经营收入会极大地刺激消费需求。因此,应大力提高农民的持久性收入水平,并不断提高农民的收入预期和边际消费倾向;同时要拓宽农民增收渠道,促进农民家庭非农业收入的增长。     

关于Hermite三对角矩阵的积和式

本文证明了三对角矩阵的积和式并给出了计算perA的HEDBASIC语言程序     

积和式的性质

本首先给出了关于积和式的两个基本性质，然后讨论了关于Kronecker积的积和式的性质。     

电磁驱动无阀并联微泵的设计与制作工艺

A parallel dynamic passive valveless micropump was designed, which consists of three layers-valve, diaphragm and electromagnetic coil. The valve was wetly etched in a silicon wafer, the diaphragm was a PDMS （polydimethyl siloxane） film spun on a silicon wafer with embedded permanent magnet posts, and the coil was electroplated on a silicon substrate. Under the actuation of the magnetic field generated by coils, the flexible diaphragm could be displaced upwards and downwards. After analyzing magnetic and mechanical characteristic of the flexible membrane and direction-dependence of the nozzle, a micropump was designed. And the relative length （L/d） of the micropump nozzle was taken 4. A 7 × 7 array of permanent magnetic posts was embedded in the PDMS film. Two diaphragms worked in an anti-step mode, which could relieve the liquid shock and increase the discharge of the micropump. The ANSYS and Matlab were adopted to analyze the actuation effect of the coil and the flow characteristic of the micropump. Results show that when actuated under a 0.3 A, 100 Hz current, the displacement of the diaphragm is more than 30 μm, and the discharge of the micropump is about 6 μL/s.