ADC和DAC工作原理比较和发展现状   总被引：1，自引：0，他引：1  

欧阳文伟 《培训与研究》2005,22(2):67-69

本从现代电子技术应用角度出发，介绍模数和数模转换器的技术，包括工作原理、特性的对比、主要技术指标及发展应用，重点介绍各类转换器的特性和工作原理及典型应用。在参考近几年器件手册和最新技术资料的基础上，挑选出几种器件，举例说明它们的应用。器件中包括了高速、高分辨率、低功耗、对数、数字电位器、∑-△转换器等各类转换器。  相似文献   

教育信息化与教师成长     

单永志 《河南师范大学学报(哲学社会科学版)》2006,33(4):188-190

信息化时代要求教育信息化,教育信息化是指在教育过程中比较全面地运用以计算机多媒体和网络通讯为基础的现代化信息技术,着力于培养教师和学生应用计算机等信息技术的能力,促进教育的全面改革,提高教育的质量和效益,使之适应正在到来的信息化社会对于教育发展的新需要。因此,全面提升教师信息素养已经成为教育信息化面临的紧迫课题与任务。教育信息化也向教师提出了新要求:树立教学技术理念,具备良好的信息素养;适应新的教学模式,建立新型的师生关系。教育信息化背景下教师成长的途径有:政府要制定优惠政策,加大经费投入;逐渐消除教师对信息化手段的畏惧与逆反心理;创设良好的信息技术教育环境,完善教师教育信息化培训制度。  相似文献   

基于数字移相全息的图像重构   总被引：3，自引：0，他引：3  

于瀛洁  周文静  Yannis Orphanos  Vivi Tornari 《上海大学学报(英文版)》2006,10(1):59-64

1IntroductionDifferent methods of holographic interferometry re-lated techniques have been used effectively for defectvisualisation in artwork diagnosis[1].Physical recon-struction of recorded wave fields though is of li mitedapplicability for on-field or…  相似文献   

无明示先行项回指解析研究     

王红玲  魏小陆 《临沂师范学院学报》2013,(6):129-131

无明示先行项回指是话语结构中一类较为特殊的指称形式。由于在语篇表层没有显性的指代,回指解析过程并不是简单地运用语言知识在语篇中找出与回指语在形式上对应的语法成分,回指关系的确定受诸多因素的影响和制约。从认知角度结合Ariel的可及性理论对语篇中无明示先行项回指现象进行解析,可以对其认知机制有更深入的分析,对无明示先行项回指现象有更全面的解释。  相似文献   

Criteria for Empowering Innovation in Higher Education     

《Africa Education Review》2013,10(4):53-71

ABSTRACT

Although academic staff have a key role to play in innovation at higher education institutions (hEIs), current innovation adoption among academic staff is disappointing. Most curricula at hEIs are stalled in the traditional pedagogical model of knowledge transmission for teaching and learning with little exploration of technologies for innovative/inventive outputs. This article explores the essential issues of innovation/invention in higher education and provides criteria for empowering innovation. Starting from reflections and perspectives on innovation at South African hEIs and the theories on innovative problem solving, the article provides arguments on multiple issues of innovation/invention that culminate in crucial criteria for innovation. The real dilemma for innovation is caused by external and macro-level factors that require the analysis of existing business models. The management of HEIs have to take into account the underlying barriers, such as knowledge of patenting and academic valorisation, when they create policies that encourage academic staff to explore innovative endeavours.  相似文献   

On Organizational Conflict: Reaping the Benefits of Effective Conflict Management     

《Journal Of Access Services》2013,10(1-2):85-120

ABSTRACT

Many librarians are called upon to supervise employees and manage conflict situations, yet most lack meaningful training in and knowledge of conflict management techniques. This article discusses the causes of organizational conflict, conflict dynamics, conflict management theories, and conflict management styles. The article is followed by an annotated bibliography of important literature in the field.  相似文献   

Solar Energy Research Institute     

《Legal Reference Services Quarterly》2013,32(3):3-8

No abstract available for this article.  相似文献   

浅谈对外汉语汉字课     

臧杰  王晓楠 《佳木斯教育学院学报》2012,(6):92-93

作者将对外汉语写字课定位为与基础汉语匹配的复练课,在教学内容统一的条件下,弥补了基础汉语字义解释、偏旁分析、汉字音形义联系上的不足。确定了对外汉语汉字课教学"由小到大,以小见大"的主要思路,结合组合拆分、情感因素、游戏教学法在课堂上的导入和应用,通过教学实践验证了以上方法的可行性,使对外汉语汉字课变得更加有趣。  相似文献   

Approaches to dispute resolution in additional support needs in Scotland     

Sheila Riddell  Elisabet Weedon 《欧洲特需教育杂志》2013,28(4):355-369

The Education (Additional Support for Learning) (Scotland) Act 2004 aimed, among other things, to increase parents’ rights in relation to the education of their children. In addition to the creation of the Additional Supports Needs Tribunals for Scotland, parents were given new rights to challenge local authority decisions through mediation and independent adjudication. In line with the wider social policy thrust of encouraging proportionate dispute resolution, low‐level resolution of disputes at school and local authority level was also encouraged. This paper uses key informant interviews to explore the views of new dispute resolution arrangements, and whether the balance of power has indeed tipped in favour of parents. Local education authority officers expressed some concerns about the new measures, and were particularly critical of the tribunal on the grounds that it was expensive and stressful, although the role it might play in tightening up procedures was also recognised. Advocacy groups and parents’ organisations, on the other hand, welcomed the new measures but were concerned about the rules restricting access to the tribunal and the fact that the outcome of mediation and adjudications were not legally binding. They were also concerned about limited access to information and advocacy. Overall, key informants believed that the new measures had advanced parents’ rights to some extent, although further changes were needed to achieve a radical shift away from the post‐war dominance of bureaucracy and professionalism in Scotland.  相似文献   

基于高分遥感的可可西里自然保护区藏羚羊生境适宜性动态监测     

宋晓阳  申文明  万华伟  侯鹏  林刚 《资源科学》2016,38(8):1434-1442

动物的生境是动物生活环境因子的综合,是野生动物赖以生存的环境。藏羚羊是一种濒危动物,是中国国家一级保护动物,近年来,人为活动的增加严重破坏了藏羚羊的生境,藏羚羊生境适宜性的评价对藏羚羊生境保护具有重要意义。本文综合考虑藏羚羊生境需求和可可西里自然保护区的生态环境,构建了藏羚羊生境适宜性评价指标体系（生态系统结构、海拔、坡度、水源、人类活动和道路）,基于2013年和2014年的国产GF-1遥感卫星影像,提取了生境要素（生态系统结构、水源、人类活动和道路）,最后结合DEM数据对保护区内的藏羚羊生境进行了适宜性评价,分析了其动态变化。结果表明：藏羚羊最适宜生境主要分布在海拔为4100~5200m的草地区域,距水源500~2000m,且远离人类活动和道路;2014年可可西里国家级自然保护区藏羚羊生境适宜区和较适宜区的面积占保护区总面积14.78%,主要分布在核心区和缓冲区,相比2013年,适宜区、较适宜区的面积分别增加了161.00km²、60.82km²,总体生境质量略有提高。  相似文献