A new set of orthogonal functions and its application to the analysis of dynamic systems

The present work proposes a complementary pair of orthogonal triangular function (TF) sets derived from the well-known block pulse function (BPF) set. The operational matrices for integration in TF domain have been computed and their relation with the BPF domain integral operational matrix is shown. It has been established with illustration that the TF domain technique is more accurate than the BPF domain technique as far as integration is concerned, and it provides with a piecewise linear solution.As a further study, the newly proposed sets have been applied to the analysis of dynamic systems to prove the fact that it introduces less mean integral squared error (MISE) than the staircase solution obtained from BPF domain analysis, without any extra computational burden. Finally, a detailed study of the representational error has been made to estimate the upper bound of the MISE for the TF approximation of a function f(t) of Lebesgue measure.     

最小二乘估计的研究进展

概要地介绍了ＬＳＥ的发现与应用,重点讨论综述了ＬＳＥ的改进研究状况与研究进展。     

Positive error climate promotes learning outcomes through students’ adaptive reactions towards errors

Errors are an integral part of the learning process and an opportunity to increase skills and knowledge, but they are often discouraged, sanctioned and derided in the classroom. This study tests whether students' perceptions of being part of an error-friendly classroom context (i.e., a positive classroom error climate) is positively related to students' learning outcomes via students' adaptive reactions towards errors. A total of 563 Italian middle school students from 32 mathematics classes completed a questionnaire on their perceptions of classroom error climate and their reactions towards errors. Students' math grades were used as indicators of their level of learning outcomes. A multilevel model showed that perceived classroom error climate was positively related to math grades via increased adaptive reactions towards errors. Our findings revealed that an error-friendly classroom context is associated with students’ adaptive adjustment to errors and to better learning outcomes in mathematics.     

用错误分析理论指导英语教学中的纠错行为

随着语言学、应用语言学、认知心理学以及其他相关学科的发展,人们对错误的态度也发生了很大的变化。错误分析理论认为：学习是一个复杂的心理过程,使外语学习者不断检验自己关于目标语的假设,并在不断的错误尝试过程中学习。根据这一理论,教师首先得正确对待错误,分析错误的根源,在教学中把握纠错的合适时机,采取最佳的纠错对策。     

错误分析理论指导下大学英语写作的研究

英语写作是学生语言表达能力和英语应用水平的综合体现,也一直是学生学习英语的薄弱环节。Corder的错误分析理论将对学习者的研究重心由语言学习的外部环境转移到对语言学习者自身的研究,有效地帮助教师了解学习者在英语写作过程中存在的问题。本文以错误分析理论为基础,通过实例分析了非英语专业学生在大学二年级时写作的常见错误,以及错误的类型和根源,并进行纠错策略的研究。     

矩阵维度对Kappa作弊甄别方法性能的影响

本文通过对Kappa作弊甄别方法中顺序量表的4％4矩阵算法进行优化,研究矩阵维度的变化对Kappa方法甄别率及I型错误率的影响,并提出用于比较甄别性能的KX系数及基于矩阵维度选择算法的Kappa-X作弊甄别方法。     

英汉二语写作指称偏误比较分析

指称偏误影响着作文的连贯性和语篇的质量。文章选取部分中外学生的英汉二语作文中的作文例句作为范例,对六种指称偏误进行比较,并分析其成因。文章指出,指称词的可及度影响着指称手段的选择;英汉二语学习者在进行二语写作时所产生的指称偏误,是由于不了解英汉两种语言之间在指称语码转换表现形式上的不同所造成的;六种指称偏误的误用程度有所不同;指称偏误类型,在一定程度上,能反映学生的语言表达水平。     

资本投入对安徽经济影响的实证分析

柯布一道格拉斯生产函数（CD生产函数）是经济分析的重要函数,固定资产投资已成为经济增长的“引擎”。本文对安徽资本存量与经济增长之间关系进行相关分析及检验,结果表明：安徽资本存量与经济增长存在正相关。最后提出我们在要加大经济投入的同时,更要注重技术创新资本结构的调整,加大资本投入对经济增长的弹性指数。     

处理会计政策变更、日后事项与会计差错的方法

会计政策变更、会计差错更正与资产负债表日后事项涉及到的问题,由于发生时间不同、发生金额不同、发生性质不同会造成会计处理方法不同.对于不同原因要使用不同的方法.     

10W集成开关电源的制作

Topwith—Ⅱ是一种PWM／MOSFET二合一的新型集成芯片，采用它制作高频开关电源，不仅简化了电路，同时可以改善电源的电磁兼容性能，降低制作成本，本文介绍一种用TOP223Y制作的稳压电源。