共查询到20条相似文献，搜索用时 78 毫秒
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挥发性有机物(VOCs)的污染与控制技术日益受到重视。近年来发展起来的非平衡等离子体技术在治理VOCs方面已初步显示其独特的技术优势,现已成为废气治理研究领域中的前沿热点课题之一。等离子体法降解VOCs的机理较为复杂,研究不同线路对VOCs降解过程的影响意义重大。采用脉冲电晕放电等离子体技术,建立了混合电晕、有机电晕、空气电晕和分别电晕4种不同的实验方案,选取苯为代表物质进行实验研究,在初始浓度、停留时间和电源参数等一定的条件下,考察脉冲电压对苯去除率的影响。结果表明,电压为140kV、混合电晕时苯的去除率达到82.73%,脉冲电晕技术处理低浓度有机废气效果较好。 相似文献
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郑华刚 《中小学实验与装备》1994,(1)
一种简单易做的高压发生器京山县孙桥镇一中郑华刚（４３１８００）本人设计试制了一种能在较宽电压范围内使用的高压发生器。现介绍如下：二、工作原理：该高压发生器利用三极管ＢＧ，脉冲变压器Ｂ等构成单管振荡器。接通电源ＥＣ。电路起振，流过初级线圈Ｌ１中的脉冲电... 相似文献
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传统的“静电除尘演示器”要用到高压电源或感应起电机．不仅实验效果差,而且使用不便。脉冲供电可提高电压和电晕电流,因而可以改善电除尘器的性能．粉尘穿透率可减少50％-60％。为此,笔者设计制作了“全自动太阳能静电除尘演示器。该演示器采用一体化封装的12V脉冲礼炮高压点火器（可工作30min以上）作为高压电源,实现高效除尘,演示效果非常好。另外,采用锂电池作为电源,并用太阳能电池进行充电,既起到了节能、环保的作用,又解决了停电不能演示的难题。 相似文献
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臭氧电晕协同处理有机实验室废水的研究 总被引：1，自引：0，他引：1
用高压电晕和臭氧联用的方法来处理有机实验室产生的高浓度废水。在最佳实验条件的基础上对高浓度苯胺废水进行处理。当降解时间为60 min时,质量浓度为500 mg/L的苯胺废水CODcr和TOC的去除率分别可达70.1%和63.2%,且处理后废水的可生化性也得到了较大的提高。因此,电晕和臭氧联用也可作为一般废水处理的前处理工艺。 相似文献
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刘娟 《渭南师范学院学报》2005,20(5):14-15
等离子体技术处理污染物的先进性引起人们越来越多的重视.文章综述了冷等离子体治理温室气体、降解有毒废气、脱硫脱硝技术的研究进展及热等离子体在污染物处理领域的应用进展,并展望了其在环境处理领域的应用前景. 相似文献
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机械加工中起冷却、作用的乳化液,循环使用变质后,必须经过处理达到国家规定的排放标准后才可以排放,达到环保的目的。采用脉冲电解法对废乳化液进行处理,高压脉冲电解耗能大,对反应器绝缘安全要求高,不利于工业广泛应用。而铝电极一低压脉冲电解法处理可降低电耗,减少电极损失,其COD去除率达到国家达到规定的排放标准。本文研究了脉冲电解法的电流大小、宽度、极板间距和pH值等因素对废乳化液COD去除率效果的影响。研究表明：酸性和中性介质电解效果好于碱性条件;电极间距可改善电解效果;适宜占空比,脉冲频率即可发挥脉冲作用,既增强电解效果,又消除钝化效果;电流密度取适均效果好。 相似文献
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采用晶闸管三相全控桥式整流电路,能使电除尘三相高压电源输出电压平稳,提高功率因数、二次电压和有效电晕功率;采用综合降低电压振打技术,可以使电晕线和收尘板更清洁,减少发生反电晕现象,提高粉尘荷电率;通过采用32位DSP为核心的控制器．配置火花优化控制、实时充电比优化控制、无效电流和低效电流处理等软件,可实现电除尘器电源的最优控制功能。实践表明,综合上述技术的新型三相高压电源和单相电源比较,电能转换效率提高了12％、功率因素提高了24％,成为目前大型电除尘器配套电源和单相工频SCR整流电源的更新换代产品。 相似文献
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荣俊锋 《实验室研究与探索》2023,(10):43-46+83
为了探索邻苯二甲酸二甲酯(DMP)废水高效降解方法，采用等离子体协同硫酸亚铁改性活性炭净化DMP废水。结果表明：放电电压40 kV、原液pH值6、放电时间60 min时，化学需氧量(COD)去除率为98.29%;放电电压80 kV、原液pH值2、放电时间60 min时，浊度去除率为95.00%。该结果与软件预测结果吻合度较高。 相似文献
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通过分析负脉冲脉冲宽度、电压幅度、延迟时间的变化对于着色效果的影响,研究负脉冲在等离子体电解着色过程中所起的作用。 相似文献
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邱崇丙 《唐山师范学院学报》2014,(1):21-23
汉字的六书,《说文》对“转注”一类,语焉不详。后世学者提及转注,也仅限于许慎所举出的例字。《汉字例说》一文,作者从转注的角度综合考虑,对部分现代常用字作了分析,跟传统的解释有所不同。希望能抛砖引玉,互相切磋,以推进学术研究。 相似文献
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《海外英语》2007,(5):10-11
Many college freshmen arrive woefully unprepared to do college work, and as disadvantaged populations continue to grow, the share of the American work force that has made it through college is expected to plummet. Many experts blame that educational failure not just on high schools but also on colleges. School & College, a special report by The Chronicle, looks at efforts to fix the system. What reforms would better prepare students for college? What should schools and colleges be doing differently? How should state and federal officials help? 相似文献
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Rachel Zupek 《海外英语》2007,(11):40-41
我们绝大部分人都同意一件事情——我们喜欢金钱。但是你对金钱的喜欢之情足够到让你创立一份事业么?.财富通常被人忽视,主要在于人们不能真正了 相似文献
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《海外英语》2007,(4):36
There are numbers of crossroads on our long and unpredictable life journey where we totally have no idea about which direction to choose. No matter what our decision is, we should not turn back, but face the music and go ahead instead. I am this kind of girl who always does try without regretting, one example is how I dealt with my love. 相似文献
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YANGShiguo 《重庆大学学报(英文版)》2004,3(1):86-88
The problem on the geometrc inequalities involving an n-dimensional simplex and its inscribed simplex is studied. Aninequality is established, which reveals that the difference between the squared circumradius of the n-dimensional simplex andthe squared distance between its circumcenter and barycenter times the squared circumradius of its inscribed simplex is not lessthan the 2(n-1)th power of n times its squared inradius, and is equal to when the simplex is regular and its inscribed siplex is atangent point one. Deduction from this inequality reaches a generalization of n-dimensional Euler inequality indicating that thecircumradius of the simplex is not less than the n-fold inradius. Another inequality is derived to present the relationship betweenthe circumradius of the n-dimensional simplex and the circumradius and inradius of its pedal simplex. 相似文献
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Migration occurs behind a variety of reasons and has a great effect on the whole world. People may migrate in order to improve their economic situation, or in order to escape civil strife, persecution, and environmental disasters. The impact of migration is complex, bringing both benefits anddisadvantages. This paper briefly talks about the causes of migration, the allocation of benefits, and the ways in which individual countries and the international community deal with this important subject. 相似文献
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GUO Bao-feng Xiao Da-wei 《重庆大学学报(英文版)》2005,4(3):129-133
Using virtual reality for interactive design gives a designer an intuitive vision of a design and allows the designer to achieve a viable, optimal solution in a timely manner. The article discusses the process of making the Virtual Reality System of the Humble Administrator＇s Garden. Translating building data to the Virtual Reality Modeling Language （VRML） is by far unsatisfactory. This creates a challenge for computer designers to do optimization to meet requirements. Five different approaches to optimize models have been presented in this paper. The other methods are to optimize VRML and to reduce the file size. This is done by keeping polygon counts to a minimum and by applying such techniques as object culling and level-ofdetail switching. 相似文献