二阶电路衰减系数α的修正

欠阻尼情况的RLC串联电路,用同频率的正弦波替代电感、电容两端的振荡波,测出电路的附加损耗,对衰减系数的理论值进行修正,可使衰减系数的实验值与理论值趋于一致。     

金融衍生证券的市场风险控制

在金融衍生证券价格服从跳跃-扩散过程的假设下，文章分析了金融衍生证券面临的市场风险。并给出了风险的概率测度方法厦风险控制。     

关于听力理解

听力理解是一个复杂、积极的过程。听者不是被动地接收听觉符号，而是要采用“自上而下”的过程(利用已知信息)和“自下而上”的过程(分析语言特点)。因此，比起其它语言能力，听力对学习者的要求更高。     

L-ficolin突变体原核表达载体的构建及表达产物的鉴定

目的构建L-ficolin突变体的原核表达载体，为研究L-ficolin的糖结合位点奠定基础。方法设计L-ficolin突变体基因上、下游引物，分别引入EcoRⅠ和XhoⅠ酶切位点。以插入L—ficolin M2（Val144Phe）和M6（Glu 307Asp）点突变的完整编码区基因的质粒pCDNA3-L-ficolin为模板，通过PCR扩增获得突变体的基因片段，将其克隆入原核表达载体pGEX—KG．然后通过酶切和序列测定对其进行鉴定；将此表达载体转化入表达菌BL21（DE3）pLvSs诱导表达。并采用SDS—PAGE对表达产物进行鉴定。结果经酶切及序列分析表明．成功地构建了重组原核表达载体pGEX-KG—L—ficolin—M2、pGEX-KG-L-ficolin—M6，SDS—PAGE显示目的蛋白大量表达。结论L—ficolin突变体融合蛋白可以在大肠杆菌中大量表达。为研究L-ficolin的糖结合位点打下基础。     

信息结构和翻译

本文阐明了什么是信息结构以及在翻译过程中保留原文信息结构所应遵循的原则.     

含有k-次增生算子方程的Ishikawa迭代过程的稳定性

在任意实Banaell空间中，设T是Lipschitzr的k-次增生算子，研究了Ishikawa迭代过程关于含有算子T的方程的几乎T-稳定性，改进和发展了一些献中的结果。     

利益关系和谐与和谐社会构建——兼析利益表达的实质与意义

和谐社会构建的实质是调整利益格局和利益关系，这种调整的目标是促进利益关系的和谐发展。从这个意义上讲，利益关系和谐是和谐社会的本质属性和外在体现。要促进利益关系的和谐发展，则必须处理好利益表达和利益代表的关系，注重和优化利益表达是实现利益关系和谐的必要环节。正视和发挥利益表达对和谐社会构建的意义和作用，就必须完善和优化利益表达的政治过程。     

The Use and Misuse of Standardized Testing: A Whiteheadian Point of View

First an overview is given about the actual national and international situation concerning standardized testing. Then two major reasons are presented why accountability systems based on standardized testing have become so widespread: (a) the missing validity and reliability of teachers’ assessment of students’ achievement, and (b) the important role standardized testing plays for out-put management in educational systems.On the basis of these considerations Alfred North Whitehead’s critical remarks on external standardized testing are presented. Whitehead’s main point is that external standardized testing limits the freedom of teachers to adapt to the complex, situation specific circumstances in order to obtain a maximum of the creative learning process for students who are conceived as specialists. Instead external testings lead to “teaching to the test.” As a consequence, the attitude of creative, adventurous exploration is undermined and substituted by simple pattern recognition, narrow visions, and even boredom. Finally, the question is raised whether there is any possibility of developing a measurement tool which on the one side meets scientific test criteria, and on the other side is still flexible enough to do justice to needs of individual schools – which according to Whitehead are the essential educational unit – and not vice versa, as it is the case at present with external standardized testing. That such a flexible approach to evaluation is possible is demonstrated by the presentation of the basic ideas of the MSS (Module Approach to Self-Evaluation of School Development Projects) which has been developed and examined in ten schools by the author and his collaborators.     

钢铁材料高抗蚀性无毒发黑处理的研究

研究一种钢铁材料高抗蚀性、无毒发黑新工艺,探讨了形成黑化膜的机理及影响黑化膜质量的主要因素,并对黑化膜的抗蚀性进行了对比试验。     

Splicing-site recognition of rice (Oryza sativa L.)DNA sequences

INTRODUCTIONCorrectlypinpointingsplicing sitesingenomicDNAsequencesisnotaneasytask ,whichisofgreatimportancetothegenomeannotationandgenefinding .Intronsaregenerallydividedinto3classes,namelycalssI,classIIandcommonnu cleuspre mRNA .IntronofclassIandIIcango…