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本文讨论了有关静电产生的原因、静电对计算机正常工作的威胁厦如何有效地杜绝静电产生的负效应，并提出了一些有效的防护对策措施。 相似文献
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为了探究人体静电产生的原因、对人体的危害和如何防护静电。作者通过查找有关文献,进行综合分析、归纳整理,发现由于人们日常生活中接触不同的介质和外界环境的影响,使人体产生了静电。它对某些行业及人体的健康都有潜在的危害。通过增加空气湿度,注意衣物和材料的防静电即养成良好的习惯等方法可以防护静电。人体静电在日常生活中非常常见,因而了解学习如何防护静电对我们的生活和工作具有十分重要的意义。 相似文献
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张霞 《深圳职业技术学院学报》2015,(5):56-60
介绍了静电产生的原因、危害及分类,电源生产过程中的静电主要为固体带静电和人体带静电,详细列举了电源上不同元器件损坏的静电值.总结了生产过程中静电的管理经验,具体包括材料的材质、车间温湿度、人员培训以及静电接地和防护的管理.得出静电管理的重点在于2方面,一方面为生产中工艺过程、材料选择限制以防止静电的产生;另一方面为创造条件加速静电的导走或者中和.通过提前预防避免发生因静电导致的浪费及品质事故,确保最终产品的性能和质量. 相似文献
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魏绍华 《佳木斯教育学院学报》2015,(5)
电子产品元器件按照种类的不同,受到静电的影响也不同,当前,集成电路、高分子材料的普遍使用,使得电子产品中产生一些若有若无的静电危害。基于此,电子产品组装过程中静电防护显得尤为重要。为提高产品质量,需要对静电防护措施进行改善。本文从电子产品组装中的防静电防护措施入手分析,并提出一些可行性的建议和措施,进而为电子产品组装中的防护提供有益思考。 相似文献
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《实验室研究与探索》2016,(10)
研究常用静电放电防护器件氧化锌压敏电阻的静电放电防护性能,设计了一套静电放电防护器性能测试方法,搭建相关测试平台。研究了该保护器件及其组合网络对静电放电脉冲的响应规律及特点,分析了动态导通电阻、箝位电压、响应峰值电流等参数与其静电放电防护能力的关系,并给出了最佳防护方案。该研究为电路设计时选取氧化锌压敏电阻作为静电放电防护器件提供了参考。 相似文献
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吴晓英 《闽西职业技术学院学报》2006,8(2):136-138
计算机房静电对计算机设备的危害是计算机故障中最难消除的危害之一,其危害主要表现在对计算机元件的损害和引起计算机设备误动作或计算机运算错误等方面。同时静电容易使工作人员在工作中遇到静电电击,影响工作人员的身心健康。对此可根据静电故障产生的季节性、偶发性、与机房环境和设置有关等特点,找出产生静电的根源,依实际情况和条件采用相应的防护措施,减少以至消除静电危害,保证计算机房设备正常运行,确保工作人员身心健康。 相似文献
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通过统计人体静电参数,得到人体在不同环境下的静电电容范围。利用模拟实验,研究了静电放电对瓦斯的燃爆电压,得到燃爆电压、能量和放电电容的关系。结果表明：人体电容为250pF量级,但在金属架附近,很容易上升到1000pF以上。在通常条件下,人体静电电压可以产生静电放电,其能量足以引爆低浓度瓦斯。 相似文献
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Education for Sustainable Development (ESD) has been recently recognized as an important area in the new Chinese educational reform. As teachers play a pivotal role, knowing and developing an effective and easy-to-use instrument for tapping teachers’ beliefs is essential. This article reports an attempt to develop an instrument with mixed methods. The finalized instruments comprise two subscales with satisfactory reliability indices obtained. Sustainability values (VSD) consists of four dimensions: respect and care for the community of life; ecological integrity; social and economic justice; and democracy, nonviolence, and peace. Teaching beliefs of ESD (TESD) consists of three dimensions: relevance to daily life; students’ need in the future; and integrated teaching. With these validated instruments, future research and potential problems will be less strenuous. 相似文献
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A diode-triggered silicon controlled rectifier （DTSCR） is being developed as an electrostatic discharge （ESD） protection device for low voltage applications. However, DTSCR leaks high current during normal operation due to the Darlington effect of the triggering-assist diode string. In this study, two types of diode string triggered SCRs are designed for low leakage consideration; the modified diode string and composite polysilicon diode string triggered SCRs （MDTSCR ＆ PDTSCR）. Compared with the conventional DTSCR （CDTSCR）, the MDTSCR has a much lower substrate leakage current with a relatively large silicon cost, and the PDTSCR has a much lower substrate leakage current with similar area and shows good leakage performance at a high temperature. Other DTSCR ESD properties are also investigated, especially regarding their layout, triggering voltage and failure current. 相似文献
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Mandy Singer-Brodowski Antje Brock Nadine Etzkorn Insa Otte 《Environmental Education Research》2019,25(4):492-507
In Germany, the implementation of the UNESCO Global Action Programme (GAP) on Education for sustainable development (ESD) 2015–2019 aims to implement ESD more profoundly within the structures of Germany’s educational system. In this context, a national monitoring has been set up in order to analyze the extent and quality of ESD implementation in all educational areas. The paper contains the results of an indicator-based desk research comprising a content analysis of key documents in three areas of education: early childhood education, school education and higher education over a period of 5 years (2011–2016). Overall, the main results indicate that, at the level of key documents, the goal of a broad implementation of ESD is not yet achieved, while there are considerable differences among the federal states. ESD and related concepts can be found more frequently particularly in documents that are more recent. At the same time, ESD is increasingly predominating other educational concepts such as environmental education. The results are one component of a comprehensive monitoring process of ESD-implementation on the level of documents and offer important insights relevant for further (political) activities aiming at a mainstreaming of ESD. 相似文献
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At the Dutch Open university much time is invested in the didactical elaboration of written study materials by the embedding of a large set of ‘embedded support devices’ (objectives, advance organisers, questions, tests, etc.). Is this high investment in the design of written study materials for use in the distance education setting worth the effort? To answer this question, we focused in this research on the actual use of these embedded support devices (ESD) by Open university students. After elaborating a theoretical model that was helpful to derive hypothetical functions and effects of a large set of ESD, quantitative and qualitative hypotheses were put forward in relation to the actual use of a subset of ESD that was implemented in a law course. The research set‐up was based on an in‐depth analysis of responses to structured interviews. Analysis of the results indicate that students make large use of ESD; nearly all ESD are used by more than 60% of the students. Furthermore, students make deep level use of the ESD. Moreover, interrelations could be detected between general student characteristics and deep level use of ESD. Women seem to be more likely to use planning ESD, orientating ESD and processing ESD at a deep level. Students with higher prior education levels seem to use ESD at deep level to a greater extent. Students with less prior knowledge of governmental law and students using study guidance use testing ESD more at a deep level.
No interrelations were detected between cognitive student characteristics and the use of ESD.
To get a better view of the ‘type’ of students using ESD, the interrelations between general student characteristics have been analysed. Especially higher educated (and intrinsic motivated) female students with a lot of study experience and less prior knowledge make deep level use of ESD. When linking the use of ESD to study success, it could be stated that students using ESD at a deep level are not only more likely to have a higher score on the examination, they also need fewer examination attempts. Comparing theoretical and spontaneously mentioned functions and effects of ESD revealed that students indicate functions that are not theoretically expected. Students seem to ascribe their own functions and effects to ESD.
The main conclusion of this research is that the high investment in the design of written study materials is worth the effort; but that it is important to take account of student characteristics when implementing ESD in course materials. It can, for instance, be argued it is desirable to incorporate into the materials ‘training’ about the use of the ESD. Moreover, these results link up with the growing tendency to develop more flexible Ou‐courses that are adaptable to individual student needs. The latter implies that the production of written versions of the study materials is to be redirected towards the development of automated interactive learning environments. 相似文献
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TAKAGI Tasuku 《浙江大学学报(A卷英文版)》2007,8(3):357-360
Electric contact discharge is subject closely related to digital information transmission, and integrity of digital signals for realizing high reliablility transmission. This kind of problem is a part of EMC (electromagnetic compatibility). From such a viewpoint, contact noise problems will be mentioned which disturb and degrade digital signals. The induction noise and radiation noise from discharge, electrostatic discharge (ESD), and connector related fundamental subject will be mentioned. 相似文献
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Kirsti Marie Jegstad Astrid Tonette Sinnes 《International Journal of Science Education》2013,35(4):655-683
For more than 40 years, the international community has acknowledged the role education might play in environmental awareness and conservation. The last major initiative came when the United Nations General Assembly proclaimed a Decade of Education for Sustainable Development (2005–2014). In the final year of the decade, teachers still struggle to realise education for sustainable development (ESD). One of the challenges teachers face with respect to ESD is the inclusion of even more content into an already overloaded curriculum. In response, it has been suggested that ESD should be introduced as an integrated perspective across the content of all existing subjects. This paper offers a model for how ESD can be realised in chemistry education. The model has been developed to support chemistry teachers in their educational planning and consists of 5 categories: chemical content knowledge, chemistry in context, the distinctiveness and methodological character of chemistry, ESD competences and lived ESD. The ESD model is illustrated through 5 ellipses, visualising the hierarchy of the categories, as they exist in different levels. All 5 ESD categories need to be considered in a holistic ESD approach. 相似文献
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潘广宇 《绵阳师范学院学报》2009,28(6):92-94,105
音色是音乐的重要组成元素之一,电子音乐的发展过程,实际上就是新音色不断探索创新的过程,民族吹管乐器音色随着电子音乐在中国的发展被作为个性音色运用其中.本文旨在从其音色本身特点出发,探讨在电子音乐创作中该音色的个性制作,最后基于不同音乐特征对音色色彩产生的影响及差异,探讨吹管乐音色在具体电子乐中音色创作规律,从而为民族吹管乐在电子音乐中更好地运用奠定基础. 相似文献
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崔玉亭 《商丘师范学院学报》1997,(Z3)
结合特殊点方案，利用自包容子程序，应用扩展休克尔理论到离子晶体．计算了NaCl晶体的电子结构，进行了理论分析，找出了NaCl晶体的能隙和价带宽度，定性解释了中性基态Na原子的低能ESD实验的结果． 相似文献
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以虚拟仪器为依托,运用电子测量、三维建模、三维动画制作和VB编程等相关技术,开发出具有实用性的多媒体电子技术虚拟实验系统。该系统具有实际操作所需要的仪器、仪表及各种元器件,生动逼真,并可与因特网连接,实现远程操作,对开放教学具有重要意义。 相似文献