Abstract Interfaces for Data Analysis —Component Architecture for Data Analysis Tools

The fast turnover of software technologies,in particular in the domain of in teractivity(covering user interface and visualisation)makes it difficult for a small group of people to produce complete and polished software-tools before the underlying technologies make them obsolete.At the HepVis ‘99 workshop,a working group has been formed to improve the rpoduction of software tools for data analysis in HENP.Beside promoting a distributed development organisation,one goal of the group is to systematically design a set of abstract interfaces based on using modern OO analysis and OO design techniques.An initial domain analysis has come up with several categories(componets)found in typical data analysis tools:historams,Ntuples,Functions,Vectors,Fitter,Plotter,Analyzer and Controller,Special Emphasis was put on reducing the couplings between the categories to a minimum,thus optimising re-use and maintainability of any component individually.The interfaces have been defined in Java and C and implementations exist in the form of libraries and tools using C (Anaphe/Lizard,Openscientist)and Java(Java Analysis Studio),A special implementation aims at accessing the Java Liraries(through their Abstract Interfaces)from C .This paper giver an overview of the architecture and design of the various components for data analysis as discussed in AIDA.     

提高主动性、参与性和学习效果的PhET仿真教学软件

<正>PhET互动式仿真项目具有深厚的教学研究背景,拥有专业的开发团队,倡导教育资源的开放共享。作为一种源码公开的免费科学教育工具,它构思巧妙,制作精良,下载量超过1.1亿次,研究成果发表在美国Science等有影响力的刊物上。在充分利用这个教学工具的同时,为了更好地了解其设计思路,借鉴其宝贵经验,有效地改进我们的大课和实验教学以及教学软件开发,应《物理》编辑部的邀请,PhET的发起人Carl E.Wieman博士(斯坦福大学物理系以及教育学院研2001)PhETWendy K.Adams(     

Discussion of the metric in characterizing the single-event effect induced by heavy ions

The single-event effect(SEE) is the most serious problem in space environment.The modern semiconductor technology is concerned with the feasibility of the linear energy transfer(LET) as metric in characterizing SEE induced by heavy ions.In this paper,we calibrate the detailed static random access memory(SRAM) cell structure model of an advanced field programmable gate array(FPGA) device using the computer-aided design tool,and calculate the heavy ion energy loss in multi-layer metal utilizing Geant4.Based on the heavy ion accelerator experiment and numerical simulation,it is proved that the metric of LET at the device surface,ignoring the top metal material in the advanced semiconductor device,would underestimate the SEE.In the SEE evaluation in space radiation environment the top-layers on the semiconductor device must be taken into consideration.     

基于GeoGebra软件定制物理工具突破滑动变阻器选择教学难点

应用现代信息技术开展虚拟实验能够帮助课堂突破教学难点,优化教学过程,提高教学效率.利用GeoGebra自主构建的工具搭建滑动变阻器限流式和分压式两种接法的电路图,直观展示了被测电阻两端的电压随滑片移动的动态图像,帮助学生更清晰地认识两种接法的优缺点,深刻理解滑动变阻器选择的原理和本质,提高解决电路实验问题的分析能力.     

珠算文化的演变与创新

<正>珠算这一古老的计算工具是中华民族宝贵的文化遗产,被誉为中国"第五大发明",虽然承载着民族繁衍生息的根基和血脉,但却日渐式微,亟需传承与创新。党的十八大以来,习近平同志深刻阐述了以中华民族伟大复兴为主题的中国梦。所以准确把握传统文化包括珠算文化的时代价值和中国梦的丰富内涵,从优秀传统文化中汲取实现中国梦的精神力量,是当前我们面临的重大理论和实践课题。一、中华传统文化、国学、珠算文化的内在逻辑中华传统文化作为中华民族的精神之根和文化之     

货币政策规则的微观基础研究

本文从企业生产视角建立一个静态一般均衡模型,揭示货币政策规则更加具体的微观含义.     

基于EPR政策的耐用品设计寿命的决策研究——从计划报废的视角

本文探究如何安排延伸生产者责任(EPR)政策从而避免耐用品像快消品一样在短期产生大量废弃物的问题。文章在已有研究基础上,从计划报废的视角,构建了一个基于连续时间的动态耐用品模型,利用最优控制方法探究了集中式决策的最优结果和分散式决策的市场均衡,并基于二者的比较分析,揭示不同市场结构下EPR政策工具对生产者延长产品设计寿命的激励效果。最后基于理论模型的分析过程,通过数值模拟和案例分析对研究结论进行验证。研究表明,在市场完全竞争情形下,实施单一的庇古税或者仅通过押金-返还制度既可以将产出调节至最优水平,也能为生产者提供足够的激励延长其产品的设计寿命;在市场不完全竞争情形下,至少需要借助税收和补贴两种EPR政策工具的配合,才能实现产出和设计寿命的最优结果。     

Distances between elements of a semigroup and estimates for derivatives

This paper is concerned first with the behaviour of differences T（t） - T（s） near the origin, where （T（t）） is a semigroup of operators on a Banach space, defined either on the positive real line or a sector in the right half-plane （in which case it is assumed analytic）. For the non-quasinilpotent case extensions of results in the published literature are provided, with best possible constants; in the case of quasinilpotent semigroups on the half-plane, it is shown that, in general, differences such as T（t） -T（2t） have norm approaching 2 near the origin. The techniques given enable one to derive estimates of other functions of the generator of the semigroup; in particular, conditions are given on the derivatives near the origin to guarantee that the semigroup generates a unital algebra and has bounded generator.     

盘声珠韵——图说中国算盘发展简史

<正>算盘,是我国古代劳动人民的伟大创造,其结构简单,算法便捷,被誉为"世界上最古老的计算机"。算盘自明代取代算筹成为我国社会主要计算工具后,在促进经济发展、推动科技进步等方面,发挥了不可估量的作用。同时,算盘还传播到了朝鲜、日     

基于“三角函数模型的应用”的项目式数学教学探究北大核心

项目式学习也叫基于项目的学习,是指学生以小组为单位围绕某一真实主题,利用各种认知工具进行调查、资料搜集、分析研究,最终展示自己的研究成果,在动手实践、思考内化和探索创新之中掌握知识、培养技能并获得全面发展．项目模式下的教学确实弥补了中国填鸭式传统教育的部分弊端,但也存在着一些不可避免的问题,如：教学内容多,课堂时间不够;生产情景难以模仿;不能实现学生的个性化学习等等．故笔者就国家高中数学课程标准要求下如何进行项目式教学进行探究,基于“三角函数模型的应用”这一项教学实例对项目式教学进行探索、实践、总结与反思,以期进一步完善,为后续的研究、改进教学提供借鉴．