正多边形一个性质的推广

运用向量方法，将陈永济同志的《关于正多边形一个有益性质的发现和证明》中的结论一正n边形内和边上任一点，到各边距离之和等于nm(m是正n边形的边心距)，推广到一般平面多边形和空间多面体中，得出：定理1平面多边形的面积等于平面上任一点，与多边形构成的三角形的定向面积之和。定理2空间多面体的体积等于空问中任一点，与多面体各个面构成的棱锥的定向体积之和，及其推论1和2。     

一类含有最大值的差分方程的振动性

对一类含有最大值的差分方程的振动性给出了充要条件。     

工程电流源综述

在信号变换及电子测量中，电流源应用广泛，其性能优劣及结构特点对测量结果有直接影响。因此，在电子测量控制工程设计中应正确选用电流源电路结构及参数。     

正项随机级数的收敛性

运用Minkowski不等式和其他不等式,研究了正项随机级数的敛散性,给出了正项随机级数收敛的两个定理,并推广了相关结果.     

负反馈放大器回归比的测试

不论何种类型的负反馈放大器，只要在反馈环路某点处断开反馈环，测试出反馈放大器的回归比，就可方便地分析研究负反馈对放大器性能的影响．     

泛函微分方程正周期解的存在性

考虑一阶中立型微分方程正周期解的存在性的充分条件,应用Krasnoselski不动点定理,改进了相关文中的结果,且得到了一些新的结论.     

对角占优矩阵的正稳定性

本文对对角占优矩阵的稳定性进行了研究,得到了对角占优矩阵具有稳定性的一些充分和必要条件.     

An empirical review of anonymity effects in peer assessment,peer feedback,peer review,peer evaluation and peer grading

Abstract

Peer assessment has proven to have positive learning outcomes. Importantly, peer assessment is a social process and some claim that the use of anonymity might have advantages. However, the findings have not always been in the same direction. Our aims were: (a) to review the effects of using anonymity in peer assessment on performance, peer feedback content, peer grading accuracy, social effects and students’ perspective on peer assessment; and (b) to investigate the effects of four moderating variables (educational level, peer grading, assessment aids, direction of anonymity) in relation to anonymity. A literature search was conducted including five different terms related to peer assessment (e.g., peer feedback) and anonymity. Fourteen studies that used a control group or a within group design were found. The narrative review revealed that anonymous peer assessment seems to provide advantages for students’ perceptions about the learning value of peer assessment, delivering more critical peer feedback, increased self-perceived social effects, a slight tendency for more performance, especially in higher education and with less peer assessment aids. Some conclusions are that: (a) when implementing anonymity in peer assessment the instructional context and goals need to be considered, (b) existent empirical research is still limited, and (c) future research should employ stronger and more complex research designs.     

一类高阶时滞偏微分方程的解的渐近性

研究了一类高阶时滞偏微分方程的解的渐近性,得到了其解的一些渐近性质,其结果推广了有关文献。     

奇异拟线性椭圆方程的正整体有界解

设β≥0是常数,f:RN×R ×RN→RN是一个连续函数．本文研究形如△u f(x,u,▽u)u-β=0,x∈RN(N≥3)的奇异拟线性椭圆方程的正整体解,给出了该类方程具有界的正整体解的若干充分条件．