有限元分析在拉深坯料设计中的应用

应用MSC.Marc软件建立三维有限元模型,对某异形产品的拉深过程进行模拟仿真。介绍了基于有限元仿真复杂拉深件坯料尺寸设计流程和方法。     

初等函数读图教学突破策略

读图是初等函数教学的关键突破点,应从学生的认知水平、认知能力、认知规律探索其教法与学法的合一,通过教师读图示范,学生读图练习,在函数图像认知中加深对函数的单调性、极值、零值、正值、负值、对称性、定义域、值域等性质的理解,从而解决相关联的数学问题.把数学教学静态分析与动态分析相结合,把数学显性层面与隐性层面相结合,将函数定式与变式相统一,从而达到教学策略的灵动以完成函数读图突破.     

Application of semantic approaches and interactive virtual technology to improve teaching effectiveness

This article describes an implementation of interactive virtual environments that have been designed for supporting the education of technical skills in material processing technology. The developed web-based systems provide the capability to train students in the technical skills of material processing technology without the need to work on actual machines in the laboratory. The effect of the developed system was examined both quantitatively and qualitatively. Generally, our results indicated that incorporating online interactive virtual environments into engineering courses can enhance students' technical skills in the operation ofinstruments, process planning and justification of process parameters. Findings also showed that the developed semantic web-based systems were able to facilitate investigation of material processing technology. The results also showed that there were significant improvements in the participants' motivation and learning.     

试谈工业革命推动下英国现代水彩画的发展

现代意义上的水彩画起源于英国工业革命之后．经过上百年的发展,已经形成了一个独立的画种,创造出了属于自己的美学特征。然而据史料记载水彩在诞生之初却并不具有独立的地位,而是由工业革命带来的地志调查、军事扩张与大陆旅行记录的产物。因此笔者主张将水彩艺术的诞生放回到英国工业革命对于艺术的影响这一原境中加以研究．从而厘清水彩艺术获得其独立性以及审美趣味界定的过程。     

家庭画测验在学前儿童家庭系统研究中的运用

为了解学前儿童的家庭系统功能及与其成长经历的关系,以家庭画为主题的绘画测验作为测评工具,探讨绘画投射技术在学前儿童的家庭系统现状研究中的应用。通过质化研究,在了解学前儿童的思想、感情,以及其家庭、幼儿园等社会环境、文化背景等基础上,对被测的家庭画作品进行解读,以家庭系统理论为基础,从家庭亲密度、家庭适应性和家庭沟通三个方面对家庭系统功能进行分析描述。     

等高线测绘过程中常见技术问题的解决方法

针对等高线测绘中经常出现的一些技术问题,以南方CASS软件为例对等高线的外业测量到内业绘制方法作了详细介绍,主要包括地貌特征点采集、高程点预处理、绘制地性线、提取高程点数据文件、DTM建立与修改、绘制等高线、等高线后处理工作、等高线的滤波与拟合等内容。     

三维软件中导出三视图和轴测图方法

分析了在AutoCAD中三视图与轴测图获得方式的优缺点,提出用Pro/E5.0导出三视图以及轴测图的优势,探寻了AutoCAD与Pro/E5.0工程图之间的转换要点,为复杂零件的三视图绘制提供了一种较为便捷的方法。     

Early Evidence of Modular Templates Used to Draw Human Figures on Mural Paintings: The Etruscan Tomba degli Scudi in Tarquinia

ABSTRACT

During recent conservation work carried out on the Etruscan mural paintings in the Tomba degli Scudi, (Tarquinia, 4th C. BCE), the study of the execution techniques led to an amazing discovery: human figures were composed using templates of single body parts. In the Tomba degli Scudi, the perfect overlap of limbs, chests, and heads was confirmed after processing rectified photogrammetric images of the wall paintings with photo editing software. The study also highlighted that such templates were probably made of rigid material and each one had three different sizes, in order to represent the hierarchical organization of the painted characters. In the past, scholars have demonstrated that templates were used to realize a number of Etruscan wall paintings. However, they had reported that only whole figures were reproduced. The notion that such templates consisted of single anatomical parts purposely created to portray figures in different poses never occurs in their studies. In fact, the use of modular templates, also called patroni and antibola, is acknowledged only from the Middle Ages onwards both in western and eastern art. Earlier evidence had never been found. This article aims to predate the use of modular shapes by about ten centuries, thus changing our knowledge of technologies whose tradition spans from the Classical Antiquity to the Middle Ages. Consequently, a new approach to the study of transfer techniques of preparatory drawings in Etruscan wall paintings is established. Furthermore, this article shows that, as in the Middle Ages, the size of such templates was scaled up or down to create hierarchies among the painted characters.     

借助Visio 2003实现标准电路图形

利用Visio 2003与Office 2003等文字编辑软件有良好的兼容性、工作界面相仿、易学易用的特点,介绍了一种绘制标准电路图的基本方法,采用这种方法能够快速绘制出标准的电路图形.