利用A/D和D/A实现频率变换的技术分析

通过建立A/D、D/A的数学模型,推导了A/D、D/A实现变频的基本公式,分析了量化噪声和变频损失,总结了其主要特点及其与模拟混频器的区别,说明A/D和D/A实现频率变换是切实可行的,在进行模数、数模转换的同时实现变频,有利于节省器件,简化电路。     

传动误差测试中的时空细分新技术实现原理的研究

提出了时空细分技术的计算机实现，并较详细地分析了这种时空红分新技术的实现原理。     

选择离子和总离子流GC/MS法测定禁用芳香胺的方法研究

研究了总离子流色谱(TIC)和选择离子色谱(SIM)GC/MS法测定禁用偶氮染料分解产生的20种芳香胺的新方法,以及总离子流色谱图中待测物色谱峰与其他干扰峰重叠或部分重叠时,采取提取离子色谱图的处理方法.18种芳香胺在10～160ng的进样量范围内,具有良好的线性关系,它们的回收率除2,4-二氨基苯甲醚在80%以上外,其他均在90%以上.     

浙江中小企业上市公司的现状与发展--基于浙粤两省企业财务指标的对比分析

浙粤两省中小企业上市公司都具有身处改革开放前沿、市场化程度高、经济发展迅速的共同背号，通过对浙粤两省中小企业上市公司的财务指标进行对比，分析浙江中小企业上市公司的优势和困境，由此提出应对的措施。     

关于马克思《数学手稿》的再认识

马克思关于求导数的运算结果应该是严格的0／0的观点是正确的，因为微积分运算不同于初等数学的运算。唯物辩证法认为一切真理都是相对真理，所以不应该把初等数学中的不允许0／0的规定绝对化。但是它应该只是一个突破口，我们应该运用唯物辩证法重新建立微积分的基础。     

倒签提单行为的法律性质及法律责任新探

倒签的提单仍然是有效的运输合同证明和物权凭证;倒签提单的行为是违约行为与侵权行为的竞合;收货人就承运人倒签提单的行为可在违约之责与侵权之责中,权衡利弊,二者择其一,更好地维护自身合法权益.     

Assessing the Efficiency of an Insurance Provider—A Measurement Error Approach

The purpose of this paper is to compare the cost efficiency of private and public property insurance providers in Switzerland. The most commonly used measure for this kind of exercise is the claims-premium ratio. We argue that this measure may give strongly biased results. We develop a simple model to test whether the elasticity of premiums with respect to claims is less than unity. We address the fact that premium income is relatively stable across time, while claims are not, using estimation techniques that correct for measurement error. We develop tools to cope with heteroskedasticity in such measurement errors and apply the model to a data set on 19 firms in housing insurance markets in Switzerland. We show that the public insurance providers are about 20% more cost efficient than their private counterparts.JEL Classification No.: C21, D21, L84     

XML实现电子商务数据交换

通过系统分析国内外EDI的发展现状，根据我国国情和国际趋势，研究了基于Internet网的EDI的优势，提出了一种基于XML数据交换技术的电子商务应用系统的客户机假务器技术架构。     

The Effect of Demand on Stock Prices: Evidence from Index Fund Rebalancing

I examine the effect of demand on stock prices by analyzing the conversion of the TIPs 35 and TIPs 100 exchange‐traded funds into the i60 Fund. This conversion occurred at the Toronto Stock Exchange on March 6, 2000. Forty stocks of the TIPs 100 Fund that were not members of the new units of the i60 Fund were sold to complete this conversion. I find that a decrease in demand produced a permanent stock price decline, which was accompanied by significant abnormal trading volume. The results provide support for the downward‐sloping demand curve hypothesis.     

Comparisons and Contrasts Between Elementary/Primary ’School Situated Design’ and ’Workplace Design’ in Canada and England

There is a lack of evidence that examines, together, the triad of how teachers in elementary/primary schools are translating curriculum requirements for teaching design, within technology frameworks, in their classrooms, how their students then proceed with design, and how ’school situated design’ relates to ’workplace design’. This paper explores the relationships between designerly thinking and behaviours situated in classrooms and in the workplace, beliefs about how designing is learned in schools and in the ’real world’, and children’s, teachers’ and designers’ understanding of design. These are be illustrated by extracts from interviews with teachers, children and designers and evidence of designing in classrooms and in the workplace. Similarities and differences between evidence from ’school situated design’ and ’workplace design’ and from Canada and the United Kingdom (UK) are discussed. This revised version was published online in July 2006 with corrections to the Cover Date.