二元函数局部一致收敛的条件

给出了当x→a时二元函数f(x,y)在y0局部一致收敛的充要条件,并且建立了实用的判别方法.     

有穷数列通项公式的三种通用求法

本文推广并证明了Lagrange插值公式，通过对Lagrange插值公式的证明，阐明了有穷数列通项公式的存在性和不唯一性，并进一步给出了通项公式的三种通用求法。     

From natural numbers to numbers and curves in nature —I

The interconnection between number theory, algebra, geometry and calculus is shown through Fibonacci sequence, golden section and logarithmic spiral. In this two-part article, we discuss how simple growth models based on these entities may be used to explain numbers and curves abundantly found in nature     

The interplay of representations and patterns of classroom discourse in science teaching sequences

The purpose of this study is to examines the relationship between the communicative approach of classroom talk and the modes of representations used by science teachers. Based on video data from two physics classrooms in Singapore, a recurring pattern in the relationship was observed as the teaching sequence of a lesson unfolded. It was found that as the mode of representation shifted from enactive (action based) to iconic (image based) to symbolic (language based), there was a concurrent and coordinated shift in the classroom communicative approach from interactive–dialogic to interactive–authoritative to non-interactive–authoritative. Specifically, the shift from enactive to iconic to symbolic representations occurred mainly within the interactive–dialogic approach while the shift towards the interactive–authoritative and non-interactive–authoritative approaches occurred when symbolic modes of representation were used. This concurrent and coordinated shift has implications on how we conceive the use of representations in conjunction with the co-occurring classroom discourse, both theoretically and pedagogically.     

五大心理咨询理论的操作过程比较

通过对心理咨询五种理论操作过程的比较，分析其异同，澄清人们对心理咨询工作的一些偏颇认识，以利于心理咨询实践的开展。     

集群式计算机系统在生物信息学中的应用

1　Introduction　SMP (symmetricmulti processing)andMPP (mas sivelyparallelprocessing)arethetwotypesofstruc tureofparallelcomputing .　Symmetricmulti processingsystemshavemultipleCPUsattachedtothesamebusandsharingRAM .Massivelyparallelprocessingisthecooperated pro cessingofaprogrambymultipleprocessorsthatworkondifferentpartsoftheprogram ,witheachprocessorusingitsownoperatingsystemandmemory .ThechoicebetweenSMPandMPPdependsonthenatureoftheproblembeingsolved .Iftheproblemcanbeeasilypartit…     

一个混沌系统的霍普夫分叉分析

讨论了一个混沌系统的霍普夫分叉情况,并通过计算系统的第一李雅普诺夫系数判断了其分叉的方向,对相应的动力系统行为也作了简要的分析.     

两个数列构成的新数列的极限

由两个收敛数列进行混排或按某种特定关系进行组合,得到一个新的数列。对这个数列的敛散性进行了探讨.     

中国中学生英语语法词素习得顺序研究

中介语的普遍性理论和乔姆斯基的普遍语法理论都认为第二语言学习者在学习目标语的过程中,会遵循某一普遍性的＂天然顺序＂,即是一个创造性的构造过程。在此过程中,母语影响不大。本文拟采用实验方法,得出中国中学生习得九个英语语法词素过程中所遵循的顺序,并与其他母语学习者习得这些词素所遵循的顺序进行比较,比较的结果发现中国中学生习得英语语法词素时同样遵循＂天然顺序＂。     

素描教学中的本真追求

从素描中的痕迹美、材料的美感、作品的表现性和画面的秩序美来探讨素描的本真精神,指出素描是艺术纯度的提炼,是从属精神的,是对艺术本质的思考之后的肯定。