网络状态方程研究

状态变量法分析电路网络的动态过程，关键是网络状态方程的求解。本根据电路特点和计算误差的要求，介绍了网络状态方程的时域解法、频域解法、数值解法和精细积分解法。结合具体算例综合比较几种解法的特点。     

谈俄汉民族特殊的文化现象--数字文化

了解不同国家与民族之间的差异,以其文化现象为切入点也不失为一条捷径,文化现象是多方面的,本文试从特殊的文化现象-数字文化为突破口,对俄汉两民族独特的数字文化进行分析和比较。     

柽柳属植物的染色体数目

The chromosome number of thirteen species of Tamarix L. in China is re- ported in this paper.  All of them have the same number (2n=24) and most of them are reported for the first time except T. hispida, whose chromosome number is the same as previously reported.     

Examining the reciprocal relations of mathematics anxiety to quantitative reasoning and number knowledge in Chinese children

This study aimed to examine the longitudinal relations of mathematics anxiety to quantitative reasoning and number knowledge in Chinese children. Three hundred and sixteen 6-year-old Chinese children in Hong Kong participated in two waves of assessments, eight months apart. Cross-lagged panel analyses showed that prior quantitative reasoning and number knowledge predicted lower mathematics anxiety, even after the effects of gender, mothers’ educational levels, and general anxiety were taken into account. However, earlier mathematics anxiety did not predict later quantitative reasoning and number knowledge. Our findings were consistent with the Deficit Theory, which postulates that mathematics anxiety comes from poor mathematical competence but not vice versa. We also found a reciprocal association between quantitative reasoning and number knowledge, in which initial quantitative reasoning had a stronger prediction on later number knowledge. Taken together with previous research, this result highlights the importance of quantitative reasoning in children’s mathematics learning and its role in mathematics education.     

Simple Numbers: ANOVA Example of Facilitating Student Learning in Statistics

This article advocates the use of simple data sets to help students gain a good intuitive grasp of ANOVA concepts.     

关于商高数的Terai猜想

设{a,b,c}是一组b为偶数的本原商高数．证明了：当a是形如16（3k＋1）＋1的素数时,Terai猜想对于几乎所有这样的素数都成立,特别地,当a=17（b=144,c=145）时,Terai猜想成立;当a是形如16（8kl＋5（k＋l）＋3）＋1的素数时,Terai猜想成立．     

基于核心论文数量和被引频次双重分布的百分位数指标改进研究

【目的】 改进现有百分位数指标在揭示期刊载文量特征方面的不足,构建基于被引频次与载文量双重分布的期刊评价指标PRC。【方法】 以2016版《期刊引证报告》生物学学科的85种期刊为研究样本,通过二八定律筛选核心论文样本集,利用布拉德福区域分析法设计基于文献密度分布的载文量权重,利用百分位数建立基于被引频次分布的引文指标,构建期刊综合影响力评价指标PRC。比较PRC与其他文献计量指标的相关性,验证指标评价效果。【结果】 PRC不仅在一定程度上克服了影响因子的内在缺陷,也能合理揭示期刊的出版规模效应,很好地均衡了相对值和绝对值两类指标,改进了百分位数指标的评价效果。【结论】 PRC指标兼顾被引频次和载文量双重分布,从数量和质量两个维度衡量期刊影响力,可用于评价科技期刊的学术影响力。     

用质量数之比代替质量之比并没有错

指出《一种错误不能再流传了》一文中用质量数之比代替质量之比并没有错,这样的代替所带来的误差是很微小的,分析计算并举例说明了它的可行性.     

Mathematical thinking intervention programmes for preschool children with normal and low number sense

This study investigated the possibility of enhancing the level of preschoolers’ number sense by introducing two intervention programmes, Let’s think! and Young children with special educational needs count, too! .Forty‐five preschoolers, mean age 66.4 months, were randomly assigned to the experimental and control groups. The experimental group received instruction twice a week, for half an hour, and for a period of nine months. Pretest–postest comparison revealed that the experimental group showed enhanced number‐sense performance immediately after the instruction ended, but the between‐group difference faded after six months. There were no statistically significant differences between the groups in general mathematical thinking abilities (transfer tasks) after the intervention.