极限组织的概念、框架与网络化生存     

卢致杰  覃正 《软科学》2005,19(1):1-4,8

首先研究了组织理论在发展过程中遇到的新问题,而后运用信息技术对组织理论进行拓展,建立了网络环境下超越时间与空间限制的极限组织理论框架体系,描述了极限组织构架的“轻量级”实现方法以及“点击熵”知识的获取过程;最后分析极限组织的网络化生存战略。  相似文献   

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   

网络时代高校图书馆重点学科文献信息资源的建设   总被引：13，自引：0，他引：13  

席会芬 《情报科学》2003,21(8):846-849

本文通过对网络环境下高校馆重点学科文献信息资源建设环境的分析，探讨了重点学科文献信息资源建设的保障及采取的策略。  相似文献   

Effects of performance feedback valence on perceptions of invested mental effort     

《Learning and Instruction》2017

We investigated whether the valence of performance feedback provided after a task, would affect participants’ perceptions of how much mental effort they invested in that same task. In three experiments, we presented participants with problem-solving tasks and manipulated the presence and valence of feedback between conditions (no, positive, or negative feedback valence), prior to asking them to rate how much mental effort they invested in solving that problem. Across the three experiments–with different problem-solving tasks and participant populations–we found that subjective ratings of effort investment were significantly higher after negative than after positive feedback; ratings given without feedback fell in between. These findings show that feedback valence alters perceived effort investment (possibly via task perceptions or affect), which can be problematic when effort is measured as an indicator of cognitive load. Therefore, it seems advisable to measure mental effort directly after each task, before giving feedback on performance.  相似文献   

Learning from direct instruction: Best prepared by several self-regulated or guided invention activities?     

《Learning and Instruction》2017

Learning from direct instruction can be enhanced by preparatory invention tasks: students invent an index that allows to differentiate a set of cases regarding important aspects (self-regulated). However, contradictory results have been found. As self-regulated activities often need practice, we tested whether the contradictory findings persist when students can practice inventing. We randomly assigned 99 eighth-grade students to two conditions (independent variable): they either invented twice (self-regulated; n = 49) or worked through worked solutions of the two tasks (guided; n = 50) before learning about ratios in physics from a lecture. Extraneous load, deep-structure recall, knowledge-gap perception, and self-efficacy were potential mediators. Transfer was the dependent measure. Guidance led to less extraneous load. However, self-regulation led to higher transfer because the students devoted more attention to the deep structure of the preparation tasks. Our findings suggest that—given some practice—self-regulated outperforms guided preparation for learning from direct instruction.  相似文献   

Bibliometric characteristics of articles on key competences indexed in ERIC from 1990 to 2013     

Francesc Buscà Donet  Alba Ambròs Pallares  Sílvia Burset Burillo 《欧洲师范教育杂志》2017,40(2):144-156

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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   

威廉姆·华滋华斯和他的“孤独的收割女”     

Cai Dianmei 《大连大学学报》1994,(2)

本文是关于威廉姆·华滋华斯个人简介以及对他的诗《孤独的收割女》的欣赏,特别是诗意与诗韵律按排的巧妙结合。  相似文献   

关于企业铁路C62A型号货车增载的可行性探讨     

赵晓海 《河北能源职业技术学院学报》2007,7(4):57-58,63

随着国民经济的发展，铁路车辆的需求矛盾日益突出，从增加运输能力的角度考虑，对现有的车辆进行增载是一个投资少、见效快的途径，根据企业铁路目前使用的C62A型车辆的主要技术参数及状况，从垂直动载荷及技术指标分析，在标记载重60t的基础上增重5t是可行的，并能产生较大的经济效益，可以在企业铁路上进行推广。  相似文献