机械传动装置设计方法研究

机械传动装置设计是机电一体化产品设计开发的一个关键部分。基于这一论点,阐述机械传动装置设计的基本要求、设计思路和注意的问题,并对具体的设计步骤做了详细分析,为提高初学者的设计能力和效率提供帮助。     

“机械设计”课程设计教学改革研究与实践

课程设计是机械设计课程教学的重要组成部分。提高课程设计的教学质量,对培养学生分析和解决工程设计问题的能力起着十分重要的作用。在实际当中“机械设计”课程设计存在诸多不足之处,从而导致教学效果不佳,无法达到预期的人才培养目标。随着教育改革的深入和持续发展,对机械设计课程进行教学改革与重新设计成为了必然的结果。就如何提高机械设计课程设计的教学质量,从设计课题、实物操作、实施模式和绩效评价等方面指出了教学改革的建议和举措。     

《机械制图》课程实践教学探究

从《机械制图》课程内容入手,在充分分析高职学生情况的基础上,以12个实训项目为载体,重构制图课程内容结构,充分调动学生的学习积极性,将实践活动始终贯穿于此课程的教学中,探索出理实结合、由简入繁、由易到难、循序渐进的机械制图实践教学模式。实践结果表明,将枯燥的课堂变成实践的场所能够更有效地提高教学质量。     

《CAD制图》课程在建筑装饰工程中的应用与研究

本文结合《CAD制图》课程在建筑装饰工程中的特点和实施进行应用与研究的,为了使建筑装饰设计教学工作取得良好的教学效果进行了大胆的教学改革尝试,通过建筑装饰工程在课程中应用与研究,并对教学模式的实施进行详细的研究与论述。进行不断探索并取得进步,让学生在建筑装饰教育领域得到更好的发展。     

基于“微课”背景下高职院校《机械制图》教学模式改革探析

《机械制图》作为高职院校工科学生必修的一门专业技术基础课,被公认为是一门既抽象又难学的专业技术基础课程。在国家大力推进教育信息化的大背景下,通过探讨如何将"微课"应用在高职院校《机械制图》教学模式改革中,让学生从枯燥、抽象的学习方式中解放出来,由无趣学习变为有趣学习、被动学习变为主动学习,从而提高他们对《机械制图》的学习兴趣与效率。     

Defining the Australian mechanical engineer

The attribute focus in engineering education now adopted by the engineering education accrediting bodies of the US, UK and Australia is based on meeting the assumed needs of professional practice. It is associated with an increasing expectation by employers of work-ready graduates rather than relying on subsequent work-based learning and experience to develop many of the essential professional practice attributes. Yet the scope of the mechanical engineering profession is broad and views of practitioners contributing to debate on attribute requirements are largely influenced by their own often unique professional formation.

In addition, the formative development of the profession in Australia has been significantly influenced by 19th and 20th century UK and US practices, although historically the industrial profile of Australia has been strikingly different. An analysis of current industry distribution of Australian, UK and US mechanical engineers presented in this paper shows continuing, although less marked, differences.

To develop a clearer perception of the profession in Australia, its educational formation, and operational environment, this paper provides a concise study of the formative development of the profession, and presents a breakdown of the industry sectors in which they are currently employed. The effects of momentous global changes in engineering employment and formation over recent decades are also discussed.

Recent changes in engineering employment have included major structural changes to organisations, accelerating technical and educational developments and mounting societal expectations making it imperative that attributes be attuned to the new engineering paradigm as increasing demands are placed on our graduates.

This paper provides an essential foundation for ongoing debate and analysis of attribute needs related to this broadly based engineering discipline. Although presented from an Australian perspective, many issues discussed are applicable worldwide.     

Tears for girls and teeth for boys: the influence of gender on children’s depiction of sadness and anger in their drawings

Up to now, very few studies investigated the influence of gender on the depiction of emotions in children’s drawings. However, the literature on emotions reveals differences between boys and girls in various kinds of tasks (e.g. recognising emotional facial expressions, understanding an emotional situation, etc.). Therefore, we examined the impact of gender on the depiction of sadness and anger. We took into account children’s gender but also the gender of the character expressing the target emotion. Forty-four boys and forty-seven girls aged 7–8 and thirty-six boys and fifty-three girls aged 9–10 were asked to listen to stories where the main character (either a male or a female) was feeling sad or angry and then to draw the facial cues corresponding to the target emotion. Two methods were used to rate the drawings: judges assessed the correct vs. incorrect depiction of the two target emotions and a content analysis was then conducted on the correct drawings so as to reveal the type of facial cues used by children. By showing the major influence of children’s gender on their depiction of sadness and anger, our findings offer promising lines of research in educational and clinical settings.     

H∞ output-feedback control for discrete-time switched linear systems via asynchronous switching

In this paper, we consider the H_∞ hybrid dynamical output-feedback control problem for discrete-time switched linear systems under asynchronous switching. A time-varying multiple Lyapunov-like-function (MLF) approach is applied to derive sufficient conditions that guarantee the stability and weighted l₂-gain performance of the closed-loop systems, where the established conditions explicitly depend on the upper and lower bounds of asynchronous switching delays. An alternative approach is proposed to decouple the bilinear problems of the control synthesis conditions. Convex optimization algorithms are also proposed based on the established conditions to determine the minimum l₂-gain performance. Two numerical examples are provided to illustrate the effectiveness of the proposed method, demonstrating significant improvement over the existing results.     

Drawing to improve metacomprehension accuracy

We examined the effect of drawing sketches on metacomprehension accuracy of science texts for 5th grade (ages 10–11) students (Study 1: N = 60, Study 2: N = 62). Students either received instruction on drawing organizational sketches, which focused on capturing the relationships described in texts, or representational sketches, which focused on capturing details described in texts. They then read and drew sketches for texts, predicted their performance, and completed tests. They completed this procedure for five texts. Metacomprehension accuracy was greater for students instructed to draw organizational sketches than for students instructed to draw representational sketches or those in a control group who did not draw (Study 2). Performance on comprehension tests was also greater for students instructed to draw organizational sketches than for students in other groups. The superior metacomprehension accuracy was explained in terms of the cue-utilization framework of metacognitive monitoring (Koriat, 1997).