浅谈AutoCAD尺寸标注在《机械制图》教学中的应用

AutoCAD尺寸标注方面也有强大的功能,利用AutoCAD的尺寸标注命令,可以方便快速地标注图纸中各种方向、形式的尺寸,将它应用到《机械制图》教学中,非常有利于学生对尺寸标注的分析理解,在正确理解尺寸注法的基本规则;正确、完整、清晰地标注组合体尺寸等教学难点问题中得到较好的教学效果。     

组合体尺寸标注教学浅析

组合体尺寸标注在教材中篇幅不多,且看起来比较简单,加之现有的学时较紧,所以在教学中易被忽略,讲授简单,结果学生不能很好掌握,特别反映在作业经常出现错误。但在实际工作中,工程图是不允许出现尺寸标注错误的,因为工程建筑物或机件大小是用图中标注的尺寸表示的,而与作图的比例和准确度关系不大,而且组合体尺寸标注这一节在教材中起着承上启下的作用,即在掌握国标有关尺寸注法的规定和基本体的尺寸注法的基础上,结合组合体的特点,弄清组合体的尺寸注法,以便结合后     

巧用坐标法保证组合体尺寸的完整性

文章针对《机械制图》教材中用形体分析法标注组合体尺寸的局限,通过探索和实践,提出标注组合体尺寸的另一方法——坐标法,解决了各类组合体视图、剖视图尺寸标注的完整性问题。     

机械制图中组合体教学的改革

组合体可以理解为机器零件进行了必要的简化,去除了铸造圆角、技摸斜度以及工艺结构,是“几何化“了的机件.组合体的投影作图,应教会学生思维方法和工作方法;在讲述画图和看图过程中,要突出分与合;在组合体尺寸标柱中,要使学生理解尺寸基准,用好尺寸基准和正确区分三类尺寸;在尺寸标注法和绘图中解决好“形“和“数“的关系.     

“组合体尺寸标注”的图例讲解

根据组合体尺寸标注必须完整、清晰的要求,针对教学中遇到的问题,阐述用图例讲解“组合体尺寸标注”的方法。     

AutoCAD尺寸标注教学方法初探

尺寸标注是AutoCAD中的一个重要部分,在各行业绘图设计中应用非常广泛。在AutoCAD计算机绘图教学中,尺寸标注是教学的重点和难点,要使学生深入体会AutoCAD特点的内容。尺寸标注所涉及的参数设置及命令多达80多个,但由于安排的学时较短,所以如何在有限的学时内使学生有效的学习和掌握相关内容,就成为教学工作者值得考虑和探索的问题。     

关于《机械制图》教学中几个尺寸标注问题的分析

尺寸标注是机械图样的一项重要内容，它贯穿机械制图教学的整个过程，但学生往往掌握不好，在标注过程中普遍存在大量问题。本文从教学的角度出发，通过多年的教学实践，对平面图形、组合体、零件图形的尺寸标注中学生普遍存在的疑问，提出自己的见解，循序渐进地进行了分析和讨论。     

AutoCAD轴测图和三维图尺寸标注及文字书写的探讨

研究AutoCAD中轴测图尺寸标注规律,详细讲解"倾斜"命令的用法,提出尺寸倾斜和文字倾斜的一般规律,总结出轴测图中尺寸标注和文字书写的方法。分析三维图中尺寸标注和文字书写易出现的问题,找到其难点是正确建立UCS,并总结出快捷方法。     

基于空间变换与形体分析的工程图学尺寸标注探讨

工程图学以培养大学生空间思维及零部件的二维表达为目的。通过投影理论,组合形体在三维与二维空间之间的转变关系清晰明确,但由于空间形体复杂多样,组合形体的二维表达在尺寸标注方面往往存在重复、多余或遗漏尺寸现象。本文以形体分析和空间变换为切入点,深入分析尺寸标注与形体二维表达的共性本质,从中找到解决组合体尺寸标注的方法。最后以具体组合体为例说明本方法的有效性。     

关于技校机械制图教学中的“尺寸标注”问题

在机械制图课程的教学过程中 ,学生总是偏于形体的图形表达 ,对尺寸标注的学习重视不够 ,往往不将尺寸标注作为重点内容学习 ,许多学生临到毕业 ,仍不能很好地掌握尺寸标注 ,这里反映出了教与学环节中的许多问题。机械类专业的学生将来参加工作之后要经常与图样打交道 ,他们可能是产品的制造者 ,也可能是产品的检验者。产品质量的保证、废品率的降低、成本的控制与他们图形的空间想象能力、尺寸标注知识的运用能力有着直接的关系。学生对尺寸标注这一部分内容掌握不好 ,一是由于尺寸标注学习起来较枯燥、繁杂 ,另外也与学生本身的知识结构有…     

Learning in the workplace for garage mechanics and technicians

Employees in technical firms, like garages, need more and more formations. Due to the very fast innovation in technology, lifelong learning is a real need for these labour forces. On the other hand, there are the needed formations very specialized and expensive. Another problem employers faced in these economical sectors in Western Europe is the lack of candidates. Also in secondary education schools, the wide interest for these formations is decreasing. One of the factors causes this problem is that schools don＇t have enough money for investing in new and high-tech machines. Therefore two interreg projects were submitted and approved for financing. Interreg is an initiative of the European Union meant for the permanent development of the ＂European Space＂. The third phase of interreg means enhancing the economic and social cohesion within the European Union. In this paper, we describe two successful projects, namely Autoweb and V@K, which try to help employers, employees, schools and students to keep up with the high-tech innovations with a workplace-based e-learning program.     

Laser-based manufacturing concepts for efficient production of tailor welded sheet metals

Laser welding is an established manufacturing technology for a large variety of automotive applications due to its attractive properties such as low heat input, high precision and fast welding speed. Especially when welding high strength steels, which are dominantly used in today＇s car body construction, the low heat input by laser welding bears significant advantages with regard to the properties of the weld seam. The exploitation of the full application potential of laser welding in mass production requires an appropriate manufacturing concept and corresponding auxiliary technologies. The present paper demonstrates the integration of laser welding into the surrounding manu- facturing concepts by a modular setup with different levels of automation. This approach offers flexible solutions for individual needs thereby optimizing investment cost, labor cost and productivity. Recently available laser sources enable exceptionally high welding speed on thin gauged sheet metals but require efficient material handling con- cepts to utilize the full speed potential. Industrial concepts are presented offering efficient material handling and high process robustness for mass production welding.     

概念图在高中生物复习总结中应用的初探

高中生物复习课教学是师生双方从新的视角对所学知识进行系统梳理、深化、拓宽及灵活应用的教与学的过程．应用概念图可以有效地组织课程内容,激发学生自主构建生物学知识体系,使知识概括化、网络化,并能灵活地迁移．     

Accessibility in post secondary education： Application of UDL to college curriculum

The inclusion of students with disabilities at the university is a relatively new occurrence in the field of special education. Although legislation in the United States has supported the acceptance of students with disabilities at the post-secondary level, it has only provided minimal support with the emphasis on the learner rather than the curriculum. Now we are looking for multiple ways for students to access learning and demonstrate mastery. Universal Design for Learning （UDL） is currently seen as a means to reconceptionalize curriculum. This study examines the experience of four professors and their effort to use a Classroom Performance System （CPS） as part of reformatting their courses using UDL. The Center for Applied Special Technology, CAST （2001） states that the goal of Universal Design for Learning is to develop teaching methods that enable all students with diverse learning needs, including those with disabilities and cultural differences, to have equal access to classroom curriculum. This paradigm shift echoes the move in special education from a deficit model to a minority rights model put forward by Hahn （1989）, and which is the basis of inclusive educational philosophy. Together inclusion and UDL create learning environments that strive to serve all students. This research describes the implementation of clickers as part of the CPS program in college courses in a special education teacher preparation program. The case study demonstrates how technology can provide access for all learners with positive outcomes such as increased participation and application of knowledge. It also illustrates some of the difficulties in making this pedagogical paradigm shift particularly in the use of technology, and the value of overcoming the existing barriers in place.     

Same vague expression, different conceptualizations

The study was to investigate the vague words measurement across native and non-native English speakers and gender differences. Ninety-two students from the University of Oklahoma participated in this study by filling out an internet-based questionnaire on the vague words. The researchers put each of the thirty-two vague words in a context, or the same word put into different contexts. The participants were asked to rate the degree or the numerical value that they thought was the most appropriate in the context of the vague word. It was found that ten out of the thirty-two words had a significant difference across the native and non-native English speakers, and two of thirty-two words had a significant difference across genders. The word ＂fairly＂ showed the most significant difference interactions of language speaking by gender.     

Correlation between process parameters and primary dendrite arm spacing in laser welding of Cu and Al

A combined numerical model of thermal field and the primary dendrite arm spacing （PDAS） was proposed to correlate the process parameters and PDAS in laser welding of Cu and A1. The solidification parameters simulated by the finite volume method with commercial software ANASYS FLUENT were applied in the PDAS model to predict the dendrite arm spacing of fusion zone. Dendrite was also examined by the metallographic method to validate the model. Results indicate that the calculated PDAS agrees with metallographic measurements reasonably, especially the Hunt model. PDAS increases apparently with increasing laser power while decreases slightly with increasing welding speed. Increasing laser power increases the secondary dendrite and increasing welding speed increases the microporosity in dendrite.     

The quantifying analysis of effectiveness of music learning through the Dalcroze musical method

Movement activities can be used to integrate with any other curriculum in childhood education. The movements can inspire the sense of rhythmic concepts for children. This study aims at investigating how children can be motivated and inspired rhythmically by body movement through Dalcroze approach. In this research, the author revealed how physical movements can motivate children＇s potential sense of rhythm and inspire children＇s interest of musical rhythmic concepts learning. The study was conducted with 1000 primary school 6th grade students from twenty primary schools in Taipei, Taiwan. These 1000 6th grade students have the same age, same music syllabus and have equally same music training at their schools. The 1000 students were divided into two equal groups, one having different activities of body movements at school, and the other without. The different activities included tapping, swinging, clapping, turning, and stamping simple rhythms. The experiments consisted two parts which were rhythm dictation and improvisational skills. All the participants were equally given the pre-test and post-test as evidences of progress of the experiment, and the researcher then compared with the differences of the two tests of the two groups before and after the experiment to see if there were any progress in their learning of musical rhythms. The study lasted 6 months and consisted of three stages： observation, comparison, and analysis. The author observed and compared the two groups of students, analyzed the results and found out that the two groups demonstrated obvious differences in their degree of progress on learning of musical rhythms.     

中学生物教学合理运用多媒体技术的探讨

如何充分发挥多媒体辅助教学的优势，将多媒体技术合理运用于中学生物教学，以取得最佳教学效果，是值得深入探讨的课题．在农村中学高中生物学教学过程中，对新授课、复习课以及实验课等3种课型教学进行了对照试验，认为对抽象知识教学及系统复习课运用多媒体手段效果较佳，但多媒体课件演示不能替代学生实验操作技能的训练．     

How intuition contributes to high performance： An educational perspective

Intuition usually is defined as the capability to act or decide appropriately without deliberately and consciously balancing alternatives, without following a certain rule or routine, and possibly without awareness （Gigerenzer, 2007; Hogarth, 2001; Klein, 2003; Myers, 2002）. It allows action which is quick （e.g. reaction to a challenging situation） and surprising, in the sense that it is extraordinary in performance level or shape. This paper reports theories of intuition and their empirical evidence in the field of professional work. It aims at reporting the state of research on intuition, discussing the relevance of different approaches for analyzing work performance, and describing challenges for future empirical research in the domain of professional working life.