电弧炉电极系统双模控制策略研究及应用

针对交流电弧炉电极控制系统具有非线性时变、多变量、强耦合及存在随机干扰的特点,采用基于最近邻聚类方法的径向基函数(RBF)神经网络快速学习算法,通过实时在线辨识,建立电弧炉电极系统的精确逆模型并用于控制,实现了将具有强耦合特性的多变量输入/输出(MIMO)系统解耦成单个独立的伪线性对象,并提出一种基于RBF神经网络逆控制与比例微分(P/D)控制相结合的双模控制策略。应用结果证实了该控制策略具有快速适应对象和过程变化的能力及较强的鲁棒性。     

International Business Cycle Asymmetry and Time Irreversible Nonlinearities

Using tests of time reversibility, this paper provides further statistical evidence on the long-standing conjecture in economics concerning the potentially asymmetric behaviour of output over the expansionary and contractionary phases of the business cycle. A particular advantage of this approach is that it provides a discriminating test that is instructive as to whether any asymmetries detected are due to asymmetric shocks to a linear model, or an underlying non-linear model with symmetric shocks, and in the latter case is informative as to the potential form of that nonlinear model. Using a long span of international per capita output growth data, the asymmetry detected is overwhelmingly consistent with the long standing perception that the output business cycle is characterized by steeper recessions and longer more gentle expansions, but the evidence for this form of business cycle asymmetry is weaker in the data adjusted for the influence of outliers associated with wars and other extreme events. Statistically significant time irreversibility is reported for the output growth rates of almost all of the countries considered in the full sample data, and there is evidence that this time irreversibility is of a form implying an underlying nonlinear model with symmetrically distributed innovations for 15 of the 22 countries considered. However, the time irreversibility test results for the outlier-trimmed full sample data reveal significant time irreversibility in output growth for around one half of the countries considered, predominantly in Northern Europe and North America, and of a form implying a nonlinear underlying model in only a further half of those cases.     

离子电子法配平方程式的简便方法

本文介绍了离子电子法在配平半反应时,利用离子、电子及溶液的介质,来调节反应式两边的电荷数,使之相等.     

中国证券业总产出和增加值测算研究

 金融机构总产出和增加值的测算是一项基础性的研究工作。与传统测算方法不同,本文借鉴经济合作和发展组织（OECD）提出的使用者成本法,把证券业视为生产性服务活动,并结合我国的实际情况,从服务的角度初步提出了我国证券业总产出和增加值的测算框架。并提出了未来研究改进的方向。     

腔内电光调制激光系统的混沌模拟

采用数值模拟的方法讨论了带反馈的腔內电光调制激光系统功率输出的分叉和混沌行为,得到了输出功率随控制参数变化的分叉图,和一些定量结果。     

论外语教学中语言输出的客观标准

语言输出的客观标准是准确与流利,准确与流利的关系问题是外语教学的重要课题.以翻译法为代表的传统教学法强调准确性,创建于20世纪70年代的交际教学法则强调流利性.不同的教学流派对学生学习语言过程中出现错误的态度亦不同,双方各有所长,寻求其可行的最佳平衡点,是外语教学必须面对的现实.     

互动中的文化拿来与输出——全球化背景下回族文化的新适应

"文化适应"是民族文化生存和发展的一种"本能"和"自觉".回族在长期的中国本土化历程中进行了千年的文化适应,回族的文化适应的历史是一个文化拿来为主导的历史,在全球化的大背景下,回族需要进行新的文化适应,而新时期回族文化适应主要是在互动的文化拿来与输出中完成.     

基于网络环境的研究生英语教学模式研究

传统的非英语专业研究生英语教学模式已不能适应为社会培养创新复合型人才的需要,对其进行改革势在必行。文章以建构主义学习理论和语言输入与输出理论为基础,构建了一种利用互联网资源辅助研究生英语课堂的教学模式,目的旨在提高非英语专业硕士研究生的英语交际能力。     

英语口头输出与书面输出的差异性对比分析——一项基于构建语言模因语料库的研究

以50名非英语专业大学生为对象,在构建同一语言模因语料库的前提下,对英语口头输出能力和书面输出能力影响的差异性进行了相关调查研究,并用SPSS17.0对数据进行分析。实验结果和访谈表明,构建同一语言模因语料库进行语言输入,对英语口头和书面输出有不同程度的影响,对书面输出的影响较口头输出的影响显著。同时在实验研究发现的基础上,分析了构建同一语言模因语料库对英语口头输出和书面输出影响存在差异性的原因所在,并提出使两者均衡协调发展的对策。     

Modeling the demand reduction input-output (I-O) inoperability due to terrorism of interconnected infrastructures.

Interdependency analysis in the context of this article is a process of assessing and managing risks inherent in a system of interconnected entities (e.g., infrastructures or industry sectors). Invoking the principles of input-output (I-O) and decomposition analysis, the article offers a framework for describing how terrorism-induced perturbations can propagate due to interconnectedness. Data published by the Bureau of Economic Analysis Division of the U.S. Department of Commerce is utilized to present applications to serve as test beds for the proposed framework. Specifically, a case study estimating the economic impact of airline demand perturbations to national-level U.S. sectors is made possible using I-O matrices. A ranking of the affected sectors according to their vulnerability to perturbations originating from a primary sector (e.g., air transportation) can serve as important input to risk management. For example, limited resources can be prioritized for the "top-n" sectors that are perceived to suffer the greatest economic losses due to terrorism. In addition, regional decomposition via location quotients enables the analysis of local-level terrorism events. The Regional I-O Multiplier System II (RIMS II) Division of the U.S. Department of Commerce is the agency responsible for releasing the regional multipliers for various geographical resolutions (economic areas, states, and counties). A regional-level case study demonstrates a process of estimating the economic impact of transportation-related scenarios on industry sectors within Economic Area 010 (the New York metropolitan region and vicinities).