Unsteady aerothermodynamics: Proposal for the establishment of a new branch within the discipline of aerothermodynamics

Researchers from the College of Physical Sciences, GUCAS, have proposed to establish a new branch, unsteady aerothermodynamics, within the discipline of aerothermodynamics. The principal objectives of this new branch, to treat by theoretical means the study of physical phenomena relating to attached boundary layer flows, have been outlined in a preliminary investigation. A report based on a feasibility study has appeared in Vol. 54 No. 8 of Science China Physics, Mechanics & Astronomy.
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System Dynamics and Airlines'''' Economic Operation Model

0　 PrefaceSystem dynamics is concerned with analysis and research of information feedback system.It attempts to investigate and solve system problems;it is an interdisciplinary subjectbetween natural sciences and social sciences,technically,a branch of system science andmanagement science.Since its development,system dynamics has attained tremendousachievements in theory and applied research,whose scope touches upon various systemsand fields.A particular case in point is its important role in…     

《计算机文化基础》多媒体课件设计

简要地介绍了多媒体制作软件———Ａｕｔｈｏｒｗａｒｅ， 主要论述了用Ａｕｔｈｏｒｗａｒｅ 设计《计算机文化基础》多媒体课件的总体结构、设计方法     

并条机弹簧摇架加压系统的动态分析

进行了并条机弹簧摇架的动态分析和现场测试，结果表明弹簧摇架加压下，牵伸罗拉有较高的一阶固有频率指出过去文献中认为胶辊可能在棉条不匀及胶辊、罗拉偏心激砺下发生共振的结论是值得商榷的胶辊的振动及对加压稳定性的影响主要取决于胶辊及罗拉的制造精度     

Magnetocrystalline anisotropy and spin-wave stiffness in tensile-strained La0.67Ba0.33MnO3 films: An investigation via ferromagnetic resonance

Tensile-strained epitaxial La_0.67Ba_0.33MnO₃ (LBMO) film has been prepared by magnetron sputtering technique on (001) oriented spinel MgAl₂O₄ substrate. The transport and magnetic measurements give an insulator-metal transition and paramagnetic-ferromagnetic transition occurring at ～150 K and 250 K respectively, which implies the phase separation in such a tensile-strained film. By analyzing the angular and temperature dependences of the ferromagnetic resonance (FMR), we determine the magnetocrystalline anisotropy of the film. It is found that the tensile-strained film is dominated by an easy-axis corresponding to the compressive out-of-plane direction, though the magnitudes of anisotropy constants are relatively small and their temperature dependences are some complex. Furthermore, the FMR spectra show additional spin wave resonance (SWR), and the field positions can be indexed to follow a linear dependence on the square of index n. The scaling gives a spin-wave exchange stiffness D of 20.7 meV Ų at low temperature, which is less than half of that in strain-free LBMO films, implying that the double exchange interaction is remarkably suppressed in the tensile-strained LBMO films.     

浅谈三段式电流保护

当线路发生短路故障时,重要特征之一是线路的电流急剧增大,当电流流过某一预定值时,反应于电流升高而动作的保护装置叫过流保护.而三段式电流保护具有作为主保护和后备保护的全部功能,在实际中得到广泛应用.     

一种考虑保护重要性差异的最小断点集选取方案

针对复杂环网整定过程中，处于同一环路中的保护容易出现相互等待、不能继续整定的“死锁”情况，提出了一种基于粒子群算法（PSO）的最小断点集MBPS求取方案．该方案考虑了保护间的重要性差异，研究了一种基于电气介数的保护重要性评估方法；为了降低MBPS对保护整定的影响，设计了新的目标函数并基于PSO实现，以保证MBPS基数最小而且重要性最低，为求取全局最优或接近最优的MBPS提供了一种新思路．算例仿真结果表明，新方法能有效地克服同基多组MBPS问题．     

Selecting an adaptive sequence for computing recursive M-estimators in multivariate linear regression models

In this paper, the authors consider an adaptive recursive algorithm by selecting an adaptive sequence for computing M-estimators in multivariate linear regression models. Its asymptotic property is investigated. The recursive algorithm given by Miao and Wu (1996) is modified accordingly. Simulation studies of the algorithm is also provided. In addition, the Newton-Raphson iterative algorithm is considered for the purpose of comparison.     

试论中国铁路集装箱运输的发展

集装箱运输是现代化运输的一种先进方式,是铁路货运和现代物流的重大变革。介绍了我国铁路集装箱运输的现状,分析了我国铁路集装箱运输存在的问题及原因,对比国外发达的集装箱运输方式,通过一系列的逻辑分析和推理,提出了中国铁路集装箱运输的发展策略,以提高铁路运输的市场竞争力。     

一种基于JSP的报表设计方法

结合中国焦化行业协会开发网直报系统的实际,提出了一种利用JSP技术开发报表系统的新方法。利用HTML+CSS实现页面的完美布局,节省了资源。在结合JDBC技术的同时,利用JavaBean对报表中指标项进行添加、更改、删除等控制,在对数据库的动态链,实现了一个可定期维护指标项目的动态报表。