逆变焊机中电容的应用     

邓文  万金保 《科技广场》2004,(11):76-77

本文讨论了在逆变电焊机中不同用途的电容特性及选用规则，以及预防早期失效的对策。  相似文献   

Mixed control of uncertain jumping time-delay systems     

Magdi S. Mahmoud  Fouad M. AL-Sunni  Yan Shi   《Journal of The Franklin Institute》2008,345(5):536-552

In this paper, we investigate a class of linear continuous-time systems with Markovian jump parameters. An integral part of the system dynamics is a delayed state with time-varying and bounded delays. The jumping parameters are modeled as a continuous-time, discrete-state Markov process. Employing norm-bounded parametric uncertainties and utilizing the second-method of Lyapunov, we examine the problem of designing a mixed controller which minimizes a quadratic performance measure while satisfying a prescribed -norm bound on the closed-loop system. It is established that sufficient conditions for the existence of the mixed controller and the associated performance upper bound could be cast in the form of linear matrix inequalities.  相似文献   

The multi-paradigmatic character of contemporary educational action research: a promising perspective or an underlying threat?     

Eleni Katsarou 《Educational Action Research》2017,25(5):673-686

From the very first moment action research started to be used in the social research field until now, it has presented significant variations. Action research looks like a mosaic of theoretical and methodological approaches, named differently from time to time and/or from place to place: for example, practitioner inquiry, practitioner research, teacher research, participatory action research, and so forth. The basic aims of this article are to find the reasons for this and to discuss the implications of the phenomenon. Starting with the first issue, we could ask ourselves: why do we today find so many and considerable variations in action research approaches in the literature? The evident reason is because action research draws upon many theoretical paradigms that – in some circumstances – are not only different, but also contradict each other. Hammersley states characteristically that action research draws upon positivism, pragmatism, hermeneutics, critical theory and postmodernism! After such claims, we can easily wonder: how can such a multi-paradigmatic approach compose cohesive methodological proposals? We can also pose another crucial question: although we can easily understand that this multi-paradigmatic nature is a real advantage which gives action research a pluralistic essence, is it really ‘a strong indicator of the power of action research to reinvent itself according to local needs’ as Somekh stated, or might it at the same time conceal serious risks?  相似文献   

College/University Counseling Centers Supporting Study Away: Challenges and Opportunities     

Charles C. Morse  Janet Dee Spoltore  Paul Galvinhill 《Journal of College Student Psychotherapy》2017,31(4):325-335

Research points to significant numbers of students on college campuses experiencing mental health distress and an ever increasing number of college students who are choosing to make an off-campus educational experience a part of their college careers. When we consider both of these trends together, it is quite apparent that a significant number of students with mental health concerns will spend periods of time studying away from campus, with converging concerns among college mental health and study away professionals about how to best support these students. This article seeks to outline both challenges and opportunities inherent in the collaboration between campus professionals in supporting students with mental health issues before and during their study away experiences.  相似文献   

强化概念教学提高解题能力     

俞端正 《中国教育发展研究杂志》2007,4(12):104-105

抓好数学概念教学是提高数学教学质量的关键。笔者从事数学教学多年，认为深刻理解、牢固掌握、灵活运用是学习掌握数学概念、提高解题能力的有效手段。  相似文献   

论《弃儿汤姆·琼斯的历史》中的人性观     

杜娟 《长江工程职业技术学院学报》2007,24(1):45-47

菲尔丁的代表作《弃儿汤姆·琼斯的历史》蕴涵了丰富的道德内容.本文认为作品的主旨和隐性结构就在于表现人性,基于此,菲尔丁不仅塑造了一个真实丰富的主人公形象,并对当时某些似是而非的道德问题和道德原则提出了讨论,表明了小说的道德主题.  相似文献   

王世贞作《金瓶梅》新证     

霍现俊 《商丘师范学院学报》2001,17(5):28-30

《金瓶梅》的作者非王世贞莫属。根据有四：①“兰陵笑笑生”中的“兰陵”并非地名,而是运用藏词艺术手法隐含作者姓王,是一个孝子;②弄珠客《序》采用析字格手法,表明《金瓶梅》的创作主旨是嘲弄姓朱的皇帝;③王世贞的父亲王Yu被杀与嘉帝有直接关系,替父报仇是王世贞作《金瓶梅》的主要动机和根本目的;④作品中的明代三个真实人物是王世贞的暗示性符号。  相似文献   

An evaluation of teaching and learning accountable practice in nurse education     

Richard Pitt  Nigel Plant 《Journal of Further & Higher Education》2016,40(5):612-629

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职高生高考数学复习的设想与实施     

李林 《铜仁学院学报》2003,5(Z1):113-114

在职高生高考数学的复习教学中,要注重区别对待不同成绩的学生,要充分重视学生的主体地位,发挥教师的主导作用.  相似文献   

XML在网络教学上的应用     

杨宇 《南通职业大学学报》2004,18(4):40-42,46

XML在网络应用中起着越来越重要的作用。本文介绍了网络教学中最常用的两种XML应用：MathML和SVG，它们分别用来在网页中显示公式和图形；并重点介绍如何将这两种重要的XML应用正确地嵌入网页中，以便在通用的网络浏览器中显示公式和图形。  相似文献