如何讲好“实数理论”

:本文探讨如何讲好“实数理论”。从实数集的完备性的公理出发到讲解“实数理论”的一系列定理及用这些定理证明的后继定理都应该突出“实数集的完备性”。使学生能抓住事物的本质 ,深刻理解“实数集的完备性”是《数学分析》的理论基础     

高校扩招的现状、问题及对策研究

1999年高校扩招政策的出台启动了我国高等教育大众化发展的进程，这是政府顺应历史潮流，适应社会经济发展、满足人民群众教育需求所做出的重大举措。在高校扩招的进程中，教育质量下滑和毕业生就业难是教育界争论得最多的两大问题，在分析现状的基础上，找出问题产生的根源，并探讨行之有效的对策来加以解决。     

Four and twenty blackbirds: how transcoding ability mediates the relationship between visuospatial working memory and math in a language with inversion

Writing down spoken number words (transcoding) is an ability that is predictive of math performance and related to working memory ability. We analysed these relationships in a large sample of over 25,000 children, from kindergarten to the end of primary school, who solved transcoding items with a computer adaptive system. Furthermore, we investigated the nature of transcoding difficulty of over 300 two- and three-digit numbers. All data come from a Dutch sample, meaning that transcoding is complicated by decade-unit inversion: 24 is pronounced as ‘four-and-twenty’. Omission to invert the digits of a spoken number when writing it down is an inversion error: the incidence of these declined but did not disappear in later elementary school. Furthermore, transcoding ability mediated the relationship between visuospatial working memory and mathematics performance, a strong effect that declined with age. Inversion error making mediated this same relationship in an inverted U-shaped curve, peaking around grade 2 (8 years old). At the item level, structural characteristics related to inversion and irregular pronunciation of units and decades explained a large part of the variance in item difficulty. We conclude that number transcoding is an important ability to develop mathematical proficiency and discuss the implications of these findings.     

图的符号边控制的若干下界

设G=(V,E)是一个非空图,一个函数f:E→{-1,1},如果满足∑e’∈N[e]f(e’)≥1对于每一条边e∈E(G)均成立,则称f为图G的一个符号边控制函数。图G的符号边控制数记为r’s(G),定义为r’s(G)=min{∑e∈E(G)f(e)︱f}为G的一个符号边控制函数。全文对图的符号边控制函数进行了研究,得到了图的符号边控制数的若干新的下界。     

内部排序算法的性能分析与探讨

文章论述了算法的评价因素,通过设计随机乱序算法程序,针对各种长度的可排序表,采用不同的测试组数,测试了6种常用的内部排序算法的关键字比较次数和移动次数,从时间复杂度方面给出了6种排序算法的优劣.     

对电大开放教育教育管理专业发展的思考

电大开放教育教育管理专业是教育部“中央广播电视大学人才培养模式改革和开放教育试点项目”的一个重要的专业。在四年的办学过程中,专业办学获得很大的成功。但随着办学的发展,教育管理专业的办学实施也逐步显露出许多问题。从总的趋势看,开放教育教育管理专业的招生人数逐年下滑,办学实施在课程计划、教材、考试、作业、教学资源建设等都有很多需要改进的地方。必须在办学实施中,不断探索专业的办学规律,采取一定的对策,彰显优势,摒去缺点,才能不断提高专业的办学质量。     

中国、印度计算机科学领域论文影响力的比较研究

文章以1999-2008年Science Citation Index--Expanded为数据来源,从发文数量、被引频次、发文期刊的时间分布、期刊影响因子、被引频次等方面对中国和印度两国在计算机科学领域内论文的发文情况进行了比较研究。     

N（O）的分布与原子核外电子分布的探讨

本文从超导电性起源于电声子机制出发,讨论了N（O）与原子核外电子层分布及电子层上的电子数的分布之间的关联问题,并用电负性均衡原理讨论了超导材料之中由于元素之间有化学键的形成,元素之间电子发生转移对N（O）的分布影响。     

基于大数因式分解的一种数字签名方案

本文利用大数因式分解的困难性提出不同于RSA公钥密码体制一种数字签名方案,并讨论了该方案的安全性。     

48 million configurations and counting: platform numbers and their capitalization

Platforms are important actors in contemporary cultural economic processes. They include social network sites, online content management systems, streaming media platforms, mobile communication infrastructures, supply chain logistics solutions, and cryptocurrencies. Analysis of platforms and their capitalization should take into account the ways they structure social practice as assets and the constitutive opacity of platforms as configured realities. It explores capitalization by focusing on the problems of counting people and things on platforms. Via a case study of the software repository platform [Github.com] (https://github.com), it analyzes how 'platform numbers’ participate in capitalization. It describes attempts to enumerate the elements of the platform by counting, mapping or listing them. The paper shows how attempts to enumerate people and things encounter forms of association, duplication, combination, imitation and configuration that are crucial to the ensemble but remain refractory to capitalization. It proposes configurative enumeration of the platform numbers as a way of conceptualizing these un-enacted excesses. In a configurative enumeration, the composition, the rhythms of imitation, variation and commutation, and constant relating, repairing and adjusting of configurations crucial to the ongoing formation of platforms come into view. Configurative enumerations engage the inventive realities of platformization, realities that precede and sometimes overflow their capitalization.