共查询到20条相似文献，搜索用时 156 毫秒
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《中学生数理化(高中版)》2019,(1)
<正>一、引言活性炭有非常大的表面积(>2000m~2/g)以及优异的吸附性,作为一种高效的吸附剂能够吸附多种有机物质及污物,被广泛应用于化工、食品的提纯,饮用水的净化以及净水处理等领域。二、活性炭质量标准活性炭在净水处理中的应用已具有悠久的历史,表1总结了目前国内对水处理用活性炭的质量基准及指标。 相似文献
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以学生在简易净水器实验中生成的问题为切入口,引导学生对各净水材料的净水速度、净水效果、净化原理以及水通过净化材料的方式进行了实验探究.得出了净水材料的最佳放置顺序;设计了能直接观察各净水材料的净水速度与净水效果的阶梯式净水装置;进一步指导学生进行课外活动,利用生活中的可取材料自制阶梯式净水装置. 相似文献
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随着水质污染的日益严重和水质标准的不断提高,常规的水处理工艺往往达不到理想的处理效果.因此,以高效去除水中溶解性有机物和致突变物的饮用水深度净化技术--臭氧化--生物活性炭联用技术日益受到重视.综述臭氧化--生物活性炭联用技术的作用机理及在水处理中的应用研究,并对发展现状及趋势进行分析. 相似文献
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供水工程是城市重要的基础设施,对城市社会和经济发展具有先导性和制约作用。依据水务工程建设的目标,研究了净水工艺选择、臭氧—生物活性炭过滤的深度处理等问题,以优化常规处理工艺净水厂提质改造的设计方案。 相似文献
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光催化氧化作为一种能有效去除难降解有机物的技术方法,在污染治理与控制中越来越受到重视,并在实际工程中得到较为广泛的应用,其基本原理和方法在环境化学等课程的课堂教学中讲授。然而,主要用于科研的光催化氧化装置在本科实验教学过程中存在占地面积大,复套数难以提高等不足,为此研制了适用于本科实验教学的光催化氧化实验装置。研发的装置具有体积较小、造价较低、使用方便等特点,通过多届本科生实验教学的应用,获得了满意的实验效果。 相似文献
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本文以射频识别技术（RFID）为理论基础,设计了一种由分立元件实现的无线通信装置,给出了电路原理图和通信程序。装置可应用于高频电子线路、通信原理、单片机原理等课程的实验教学,完成多种实验项目,提高学生的学习兴趣,改善教学效果。 相似文献
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两自由度可控机构动态性能实验装置研制 总被引：1，自引：0，他引：1
为响应创新开放式实验教学模式改革,结合高校力学课程基础实验特点,研制一种具有功能转换的两自由度可控机构动态性能实验装置,该实验装置不仅可以完成运动学正运算与逆运算验证实验和材料力学基础实验,还可以进行机械系统动态性能实验研究,可广泛应用于本科和研究生力学课程创新开放实验活动中.最后给出实验实例. 相似文献
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随着信息技术的迅速发展和国家新一轮课程教材改革的推进,以传感器和计算机为基础,实现信息技术与传统实验教学整合的数字化实验室应运而生。本文就中学生物实验中应用传感器技术作一简单论述,期待这一新的技术能早日并广泛地应用于生物教学,为传统的生物实验教学注入新的活力。 相似文献
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罗艳萍 《读与写:教育教学刊》2008,5(6)
The communication of people partially is the communication of cultures. Culture has a direct effect on international commercial activities in all aspects. Different conceptions about time, space, equality, law and the like, lead people to deal with things in different ways. So to know cultures of the counterpart is to facil-itate our enterprises so as to have a smooth and successful communication in commercial activity. 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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Richard Denner 《海外英语》2007,(4):14-15
Rosco and I wait for the fishermen to return.I sit at a wooden bench near the store at Mt.Baker Resort and watch the clouds change shape. Rosco has my belt around his neck and an eight foot tow chain hooked to a tree. Dogs must be on a leash. Ducks and rabbits are loose. 相似文献
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Given a graph G,a subgraph C is called a clique of G if C is a complete subgraph of G maximal under inclusion and |C|≥2. A clique-transversal set S of G is a set of vertices of G such that S meets all cliques of G. The clique-transversal number, denoted as TC (G), is the minimum cardinality of a clique-transversal set in G. The clique-graph of G, denoted as K (G), is the graph obtained by taking the cliques of G as vertices, and two vertices are adjacent if and only if the corresponding cliques in G have nonempty intersection. Let F be a class of graphs G such that F={G|K(G) is a tree}. In this paper the graphs in F having independent clique-transversal sets are shown and thus TC (G)/|G|≤1/2 for all G ∈ F. 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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陈美曦 《山东教育学院学报》2008,23(2):103-107
Different nations have different social cultures, and the social culture of every nation is developing with the development of the nation, language is greatly influenced by social culture, which enables language to possess national and historical characteristics. Word is the smallest, independent, meaningful linguistic unit of language. It can well reflect the national and historical characteristics. From synchronic aspect, the social and cultural influence on word meaning is mainly embodied in conceptual and associative meanings of word. The incorrespondence of word meaning is a phenomenon that exists in both conceptual and associative meanings of word among different languages. From diachronic aspect, the development of social culture causes some changes of word meaning to some extent. Therefore, social culture plays a key role in vocabulary learning and mastery of a language. 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