高速铣削的技术特点及在模具加工的应用

分析了高速铣削加工的技术特点及对加工设备、数控系统、刀柄和刀具、加工工艺的技术要求,并指出高速铣削技术在模具加工应用的优越性。     

从工具性到本体性——语言重要性之初探

语言伴生于人类社会的产生,其对人类的重要意义不言而明。本文从传统语言观对语言的工具性理解着笔,进而分析了从施莱尔马赫到伽达默尔几代哲学诠释学家的语言观,借此,可以明显看出他们所理解的语言的重要性在不断提升,并逐渐从对语言的工具性认识深入到本体性认识。     

基础教育信息化教学创新：内涵、要素与测量

基础教育信息化2.0阶段发展的核心任务是推进信息化教学创新,其前提在于清晰地认识信息化教学创新的内涵及其构成要素,并对基础教育信息化教学创新发展的现实水平进行科学测量。基于以上考虑,文章明确界定了"教学创新"与"信息化教学创新"的内涵,深入分析了基础教育信息化教学创新的六大核心要素,并遵照量表研制的一般流程,开发了具有较高信、效度的基础教育信息化教学创新的测量工具。文章的研究为信息化教学创新水平测量提供了科学的评价工具,并可为基础教育一线学校推进信息化教学创新提供理论参考。     

电化教学与工具环境的探讨

通过中文Ｗｏｒｄ的应用介绍一种实现电化教学的简便方法，探讨利用现有系统资源选择电化教学工具平台进行教学     

MCS-51单片机在普通机床数控改造中的应用

介绍了在普通机床上采用MCS－51单片机作为控制器，步进电机作为驱动执行元件的数控改造方法。给出了系统硬件构成方案及软件的组成。     

Parameter estimation of cutting tool temperature nonlinear model using PSO algorithm

INTRODUCTION In modern metal cutting theory,research on cutting tool is one of the major concerns.To under-stand the characteristics of a new cutting tool,many experiments(such as cutting force experiment,cut-ting temperature experiment,anti-striking experiment,etc.)should be conducted to obtain an enormous amount of experiment data.The development of a proper cutting tool temperature model is a very dif-ficult task due to the large number of interrelated parameters(cutting speed,feed,dept…     

秋季不同刈割时期对柱花草根系贮藏养分动态的影响

通过分析秋季不同刈割时期对奎安柱花草１８４品系根系贮藏养分动态的影响，对柱花草冬前刈割的临界危险期进行了初步的探讨．根据柱花草根系积累养分的开始期以及根系粗蛋白质和淀粉含量动态对９月１０日和１０月１０日刈割处理的反应，柱花草在试验年度的冬前刈割的临界危险期为９月初～１０月底     

A Study of the Effectiveness of Computer-Based Simulations in Teaching Computer Architecture

No abstract available for this article.     

Quantification of the manifestations of fatigue during treadmill running

Abstract

During whole-body exercise, fatigue is difficult to quantify; however, changes to mechanical, physiological and psychological systems during exercise are associated with the development of fatigue. To quantify fatigue, one must therefore assess changes occurring in these variables. The purpose of this study was to demonstrate a method to assign weightings to selected variables and to combine them into a single value quantifying changes occurring during exercise. Twelve female recreational runners performed one hour of treadmill running, during which heart rate, respiration rate, stride frequency and six selected psychological variables were collected at defined intervals throughout the run. Data were normalised and a principle component analysis was performed. The resulting first eigenvector was termed the “contribution vector” and indicated the weighting of each variable towards the global exercise-induced changes in the body. The projection of data onto the contribution vector resulted in a value described as the “fatigue index”. An assessment of the generalisation of the method to new data was performed using a leave-one-out cross-validation procedure and indicated that the index is accurate to within 3.01% of the maximum index value measured. The method developed here has the advantage over current methods due to its multifactorial, causal and customisable nature.     

问题解决情境下认知工具的设计研究——以数学应用题为例

运用有效认知工具支持学生的问题解决过程逐渐成为当前研究的热点和趋势。针对目前问题解决过程中缺乏有效认知工具支持的现状,文章首先梳理了国内外对认知工具的相关研究,然后以数学应用题为例,总结了影响解题的一般因素,并针对影响因素提出可以辅助教师教学设计和学生学习的认知工具,旨在提高学生的问题解决能力。在此基础上,从问题解决的角度提出了相应认知工具的设计原则和系统模型。