Measurement of conversion efficiency of soft X-ray from 0.35μm laser-irradiated aluminum planar targets     

Shu-xi Ren  Hong-liang Ma Ph. D.  Rong-qing Yi  Shen-ye Liu 《上海大学学报(英文版)》2006,10(3):224-227

Conversion efficiency of soft X-ray from 0.35 μm pulse laser-irradiated aluminium planar target at laser intensities 10¹³–10¹⁵ W/cm² on the Xingguang-II facility (laser energy 5–90 J, focal spot ⊃ Ф 200 μm full width of half maximun (FWHM) 400–800 ps) was measured. A simple model was given to explain soft X-ray conversion efficiency. In this model, because of the heat conduction from the laser-heated spot, the conversion was very small at lower irradiance limit, while at higher limit it was bounded by the energy lost in blow off plasma. Consequently, at the laser intensity around 2×10¹⁴ W/cm², the X-ray conversion efficiency reaches a maximum. Project suppoted by Shanghai Leading Academic Discipline Foundation (Grant No. T0104), and Science Foundation of Shanghai Municipal Commission of Education (Grant No. 214680)  相似文献   

高校体育教学如何培养学生创新意识和创新能力     

马小清 《桂林师范高等专科学校学报》2003,17(1):73-75

在高校公共体育教学中，教师要注意创造和谐、宽松的教学环境，改革体育教育过程，启发学生思考，指导学生积权探索，多鼓励学生，提高他们的自信心，从而进一步提高学生的创造思维，逐步培养学生的创新意识和创新能力。  相似文献   

热色性材料变色机理及应用   总被引：3，自引：0，他引：3  

陈昌云  周志华  薛蒙伟  马美华 《南京晓庄学院学报》2002,18(4):20-22

本文介绍了各类热色性材料的变色机理 ,重点探讨了国内外在可逆热色性材料领域的研究动态、应用及发展趋势  相似文献   

关于高等教育协调发展的思考     

黄木生  梁银怀  马发生  李之群  胡炼 《湖北成人教育学院学报》2004,10(6):2-4

本文对公办高校迅猛扩展的作用及隐忧的问题作了分析；提出了公办高校在本专科教育市场为民办高校“让一步”，使教育发展在整体上“进三步”的构想；阐述了民办高校的办学水平问题主要是管理问题；探讨了独立学院与民办高校如何协调发展的问题。  相似文献   

广告中成语活用的几种修辞方式     

马芝兰 《沙洋师范高等专科学校学报》2002,3(1):42-43

许多商家借助广告语中成语的灵活运用获得了极大的经济效益，本结合目前广告语言发展的具体情况，从修辞角度分析了成语活用的几种方式，对这种极富中国特色的广告持肯定态度。  相似文献   

Why some teachers easily learn to use a new virtual learning environment: a technology acceptance perspective     

Bart Rienties  Bas Giesbers  Simon Lygo-Baker  Hoi Wah Serena Ma  Roger Rees 《Interactive Learning Environments》2016,24(3):539-552

After a decade of virtual learning environments (VLEs) in higher education, many teachers still use only a minimum of its affordances. This study looked at how academic staff interacted with a new and unknown VLE in order to understand how technology acceptance and support materials influence (perceived and actual) task performance. In an experimental design, 36 participants were split into a control (online help) and experimental (instructor video) condition and completed five common teaching tasks in a new VLE. In contrast to most technology acceptance model research, this study found that perceived usefulness of the VLE was not related to (perceived) task performance. Perceived ease of use was related to intentions and actual behaviour in the VLE. Furthermore, no significant difference was found between the two conditions, although the experimental condition led to a (marginal) increase in time to complete the tasks.  相似文献   

“科尔曼报告”述评——兼论对我国解决“上学难、上学贵”问题的启示   总被引：1，自引：0，他引：1  

马晓强 《教育研究》2006,(6)

“科尔曼报告”是在二战后随着教育平等、教育民主化思潮的出现以及美国民权法案对教育机会均等现状调查的要求而产生的。报告对美国教育机会均等的现状和影响因素进行了科学的分析,认为校际间差距对不同种族的学生有不同的影响,造成儿童学习水平低的原因,主要不是学校的物质条件,而是学校内的社会因素。“科尔曼报告”深刻地影响了教育机会均等的理论研究与政策实践,对分析和探讨当前我国“上学难、上学贵”问题具有重要的借鉴意义。  相似文献   

尊重学生 理解学生     

朱丹  马茜 《潍坊教育学院学报》2006,19(4):74-74,90

本文讨论了平等对待学生、理解学生对于教育的重要性。通过对学生人格、独立意识、诚信的尊重以及理解学生等的论述,指出:教师对学生的尊重理解是自身获得尊敬和理解的前提,也是取得教育成功的关键。  相似文献   

Development of a plastic injection molding training system using Petri nets and virtual reality     

马斌  郭志英  周华民 《浙江大学学报(A卷英文版)》2006,7(3):302-308

INTRODUCTIONAt present, plastic as a substitute for metals in products is the most important mainstay in industrial raw materials. Furthermore, plastic injection molding is one of the most common and versatile methods for mass production of complex plastic parts with excel-lent dimensional tolerance. Since the technology of injection molding has been widely applied in manu-facturing, training on injection molding is of great importance. The traditional approach is to consult some technica…  相似文献   

以课堂交互软件促进大学教学质量——学习者采纳意愿及应用效果     

张进宝  马婧  姬凌岩 《现代远程教育研究》2011,(4):83-88

PowerPoint用于课堂教学,已经成为大学教学中的常规活动。然而,电子演示文稿在大学课堂中的应用还存在信息单向流动、交互少等问题。基于PowerPoint的课堂互动软件提供了一种经济、方便的解决方案。教师和学习者对这种解决方案的接受度如何？Microsoft Interactive Classroom和UW Classroom Presenter两种课程交互软件在课堂教学中的试验显示：教师和学生在首次接触此类软件后均表现出较高的采纳倾向;课堂交互软件有助于学习者个性需求表达和满足,可以提高学习者的课堂参与度。但是当前已有的课堂交互类软件在功能完备性、实用性以及灵活性上尚不能有效满足教师和学生的需求。  相似文献