基于频域指标的数字控制器直接设计法

本文根据 Ragazzini 直接设计法的思想,综合应用最少拍设计法,零极点综合法及大林算法中的处理方法,提出一种基于频域指标要求的数字控制系统直接设计法。这样设计的系统具有适应能力强、无振铃现象等优点。     

Pragmatism, Pedagogy and Philosophy A Model of Thought and Action in Action in Primary Technology and Science Teacher Education

This article reports on one outcome from a three-year study with pre-service primary teachers at Goldsmiths' College, University of London. The purpose of the study was to evaluate the influence of participants' prior educational experience and beliefs about the relationship between design & technology (D&T) and science on their lesson planning for these subjects during school placements. Data from the study support a three-domain model of pre-service teachers' thinking and action. When operating within the pragmatic domain, participants are primarily concerned with survival in the classroom, resulting in short-term planning which may contradict their epistemological and curricular beliefs. In the pedagogical domain, the focus shifts from the pre-service teacher themselves and their immediate survival to the learning potential of the activities they plan. There is evidence that some participants have progressed to operating within a philosophical domain, leading to clasroom practice which reflects and re-conceptualises pre-service teachers' core beliefs about the nature of, and relationship between, D&T and science. This revised version was published online in July 2006 with corrections to the Cover Date.     

输电钢管杆稳定性分析的阶梯折算法

应用一维非均质体结构的阶梯折算法理论,建立了输电钢管杆的数值分析模型,推导了钢管杆的整体稳定计算方法,算法运用计算机易于实现,解决了荷载和刚度沿杆体变化的复杂杆结构整体稳定二阶计算问题,在电网工程建设和设计中有较好的实用价值。     

通货膨胀及其影响因素的动态分析

文章通过建立宏观经济模型对1995--2010年间我国通货膨胀的动态走势进行了研究。结果表明：我国货币市场不仅存在实际货币需求、真实GDP和名义利率间的长期均衡关系,在贸易市场上还存在名义汇率、国内价格水平和国外价格水平之间的长期均衡关系。误差修正模型表明通货膨胀的短期波动依赖于货币供给、名义利率和实际GDP的变化,且具有很强的通货膨胀惯性,货币市场和贸易市场非均衡对通货膨胀的变化也有重要影响。     

我国经济内部失衡与外部失衡关系的实证分析——基于存贷差和外汇储备变动量的关系

我国经济主要面临内部失衡和外部失衡的矛盾,即存贷差过大和外汇储备过多的矛盾。本文经过理论模型的推导,证明了存贷差和外汇储备之间存在一定的关系．并通过实证分析对这一关系进行检验,发现存贷差是外汇储备的格兰杰原因。     

中国经济周期波动中冲击构成的实证分析

利用SVAR模型对中国经济周期波动中冲击构成进行分析,同时运用ADF单位根检验、Granger因果关系检验、脉冲响应和方差分解等计量经济方法研究了产出、利率和财政支出与我国宏观经济波动的关系。研究结果表明：利率外生于系统,但产出和财政支出互为格兰杰因果关系;我国的货币政策在长期非中性,它可以直接影响到产出和其他实际变量;产出对源于产品市场的需求冲击和产品的供给冲击的响应均是正向的;经济周期波动中供给冲击所占比重小于需求冲击所占的比重。     

煤炭价格指数的理论设计与应用研究

论证了在当前煤炭价格风险凸现的情况下,推出煤炭价格指数是运用煤炭期货、期权及互换等金融衍生工具的重要前提,并借鉴国外煤炭价格指数应用与研究的经验,提出我国煤炭价格指数的基本体系及编制的基本原则和基本方法.     

中国民生发展指数总体设计框架

十二五期间,中国保障与改善民生仍面临着诸多挑战,设计一套科学性、系统性、可操作性、可比性及可量化性的评价体系有利于测度中国民生发展状况与进展,在政策层面上起到省域民生发展的战略导向作用。中国民生发展指数整体框架涉及指标体系构建、指标数据处理、评价指数计算等几个方面,结合国内外通用规则,采用综合评价指数法对我国区域民生发展水平进行横向比较与纵向考察。通过编制与分析中国民生发展指数,加强了对中国民生区域发展差异深层次理论与实践问题的探索与理解,为政府正确决策提供科学依据。     

Purchasing Power Parity under Regime Shifts: An Application to Asian Countries*

This paper re‐examines the long‐run purchasing power parity (PPP) relationship for nine Asian countries relative to the USA and Japan during a period containing significant structural breaks. The relevance of considering structural breaks in PPP tests is demonstrated by utilizing the Johansen et al. (2000) procedure that allows for up to two pre‐determined structural breaks. Using conventional tests without considering breaks, one is able to reject the null of no cointegration for only four countries. The Johansen et al. procedure clearly demonstrates the importance of allowing for structural breaks and provides strong support for long‐run PPP for all the countries, regardless of the base country, except in the case of the Philippines vis‐à‐vis Japan. The Hansen–Johansen parameter constancy test indicates stability for all the countries except the Philippines relative to the USA and Malaysia relative to Japan.     

安徽省科技投入与经济增长关系的计量分析

随着科学技术的快速发展,科技投入对经济增长的作用越来越明显。本文依据安徽省1992—2009年间科技投入与经济增长的有关数据变量,应用SPSS、Eviews等软件研究安徽省科技投入与经济增长两指标之间的互动关系,建立了反映两者长期协整关系的模型,并对两序列进行格兰杰因果检验。研究结果表明：安徽省科技投入与经济增长间存在长期稳定的均衡关系,且两者间存在单项因果关系。最后根据研究结果,提出一些建议。