20世纪西方课程实验的历史经验及其启示

20世纪西方课程实验经历了活动课程、结构课程、人本主义课程三次实验高潮。探索西方课程实验的历史发展有助于总结课程实验的经验与教训 ,对我国当前基础教育课程改革与实验有启发意义     

安钢2#高炉PROFIBUS局域网络系统设计

安钢2#高炉自动控制系统中修改造中,采用PROFIBUS网络技术,开发设计了2#高炉局域网络系统,全面实现了2#高炉主要生产工艺的自动控制和对整个高炉炼铁生产的集中监控.     

遗传算法在无纸化考试系统中实现随机抽题

随机抽题是无纸化考试系统要解决的一个重要问题。本文介绍了应用演化计算的三大分支之一的遗传算法实现随机抽题问题,详细阐述了遗传算法的主要思想、随机抽题问题的编码表示、适应性函数和遗传算子的设计、淘汰策略和停机准则的选择,并用Delphi给出关键模块的详细代码及其相关分析。     

创新优化数学递分求原应用题的解法探究

递分求原是数学领域的新概念，递分求原一类应用题是从正面解答很难入手的问题。通过探究、归纳、论证推出了正面解答此类应用题的一个式子，创新优化了解答此类应用题的方法。此式对分配的次数多少不限，每次分率的大小不限，每次再多拿（或少拿）也不限，分配次数越多而优越性越大，具有普遍性和实用性．此式，有规律易懂易记，利用此式可以解答二般人无法入手的应用题。得到推广不仅可以开阔读者的解题思路，培养他们的创新、发散思维，而且还能激发他们的解题潜能，改变、拓展他们固有的思维方式，从而进入一个更加自由、更加宽广的解题空间。     

Algorithm for 2D irregular-shaped nesting problem based on the NFP algorithm and lowest-gravity-center principle

INTRODUCTION 2D irregular-shaped nesting problem is the problem of finding an efficient arrangement for pieces in a containing region without overlapping (Fig.1), and is aimed at maximizing use of material. Nesting problem is of great interest to garment, paper, ship building, and sheet metal industries since small improvement of layout can lead to large savings in material. Many effective solutions have been pro- posed for the case when pieces and containing region are both rectangular. …     

“军卫一号”网络环境下医院数字化图书馆系统的建立与服务

针对医院图书馆的服务现状与需求，阐述了数字化图书馆建设的重要性，并总结了军队医院利用“军卫一号”工程构建数字图书馆的实践经验和取得的成果。     

门德尔松《威尼斯船歌》（Op．19No．6）的混沌与分形结构特征分析

文章运用混沌与分形理论,对德国浪漫主义作曲家门德尔松的《威尼斯船歌》（0p．19No．6）的结构特征进行了简要分析。认为该作品既表现出依赖“初始条件”的确定性和“自相似性”特征,又表现出某些不依赖上述因素的不确定性特征,从而表现为有序与无序相结合的混沌状态。     

乱象丛生的清末民初兰州金融业

近代兰州的金融业,既包括新式的银行业,也包括源远流长的古代银钱业,如银号、钱庄、票号和当铺等。兰州地处西北交通要冲,自明清以来一直为商业重镇。与之相适应,商品经济也比较兴盛。清末以来兰州地区以银行业为标志的现代金融业开始兴起,以银钱、典当为主的旧式金融机构则在发展中不断变化。     

News and Communications

ABSTRACT

The author examined how local charter school educators respond to the accountability measures being imposed on them. Encouraged by early indications of increased test scores, state and federal policymakers continue to support accountability as an effective means to improve schools. Surprisingly, there has been little research on local educators’ experiences with and responses to such reforms. This lack of research is striking because teachers, principals, and superintendents are directly responsible for the implementation of accountability mandates, including administering tests, teaching to the state standards, and implementing state-approved curriculum packages. In an effort to understand teachers’ and administrators’ experiences with public school accountability, the author explores how educators in 4 charter schools in Michigan understand recent accountability mandates with respect to school reform.     

Unreliability of Individual Scores in Mental Measurements

Abstract

The effectiveness of the game Order Out was investigated and differences in achievement when a) sets of fraction bars, b) pictorial representations of fraction bars, or c) neither physical nor pictorial aids were made available during the play of the game. The game was played 20 minutes, twice weekly for 5 weeks. The subjects were 85 fifth grade students in four intact classes and 177 seventh grade students in eight intact classes. Pre- and posttests of 40 items were given; in each item, the student ordered a pair of proper fractions. The game was an effective way to improve students’ achievement of the game content. There were no significant achievement differences among treatments. Post-hoc analysis of the data revealed sex-related trends suggesting two hypotheses for further study.