共查询到20条相似文献，搜索用时 62 毫秒
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针对化学专业综合创新实验的开设,结合物理化学和分析化学的知识,以二茂铁为柴油燃烧的促进剂,将氧弹装置与环境监测实验中的气体采集系统结合,建立了"燃烧促进剂对柴油助燃消烟作用与尾气成分测定"的实验装置.通过该实验装置与实验方法,测定二茂铁对柴油燃烧效率与速率的影响,以了解二茂铁对柴油的助燃消烟作用,并通过环境检测与分析中的"甲醛缓冲溶液吸收-盐酸副玫瑰苯胺分光光度法"以及"盐酸萘乙二胺分光光度法"测定燃烧废气中NO2以及SO2气体的浓度.通过该实验,使学生综合了解燃油添加剂在燃油助燃、消烟与节能减排中所起的作用,学习废气的监测与分析方法,关注社会,关注环境.实验结果表明本实验设计科学合理,可作为化学及相关专业综合创新实验开设. 相似文献
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研究了以二茂铁为初始原料,经过二茂铁的酰基化反应生成乙酰基二茂铁,然后再制备3-氯-3'-二茂铁基丙烯醛中间体,3-氯-3'-二茂铁基丙烯醛再与水合肼关环生成吡唑环,制备出3-二茂铁基吡唑。该制备方法收率较高,本论文的实验方法可以为其他二茂铁类杂环化合物的制备提供研究方法;同时也可以根据二茂铁基吡唑的特殊性质,有必要做进一步的化学遗传学研究。 相似文献
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二茂铁的研究一直受到了世界各国的重视。本文综合讨论了二茂铁的各种功能和用途,并介绍了二茂铁的应用和发展趋势。 相似文献
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马广宽 《唐山师范学院学报》1996,(Z1)
本文阐述了二茂铁的性质、用途,并对相转移催化法制备二茂铁的实验进行改进。反应后采用水蒸汽蒸馏的方法代替过去的方法,制得了纯度更高的二茂铁,缩短了制备时间,提高了效率。 相似文献
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本文阐述了二茂铁的性质，用途，并对相转移催化法制备二茂铁的实验进行改进。反应后采用水蒸汽蒸馏的方法代替过去的方法，制得了纯度更高的二茂铁，缩短了制备时间，提高了效率。 相似文献
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二茂铁的合成及二茂铁对柴油燃速和燃烧效率影响的研究 总被引：1，自引：0，他引：1
利用计算机辅助化学实验系(CACE)有自动采集数据、存储及数据处理，适宜于快速反应的在线研究等优势，测定了在柴油中加入二茂铁后对柴油燃速和燃烧效率的影响，作为综合设计型实验应用于物理化学的实验教学中。 相似文献
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"水-柴油微乳体系拟三元相图绘制与燃烧性能测定"实验教学设计 总被引：1，自引：0，他引：1
实验中将三元相图的绘制方法与量热技术相结合,选择备受关注的能源与环境问题,结合水-柴油体系的微乳化原理与拟三元相图的绘制,配制不同性质的乳化柴油,并通过氧弹量热装置测定柴油、乳化柴油以及添加助燃催化剂二茂铁后燃油的燃烧效率与速率,以了解乳化柴油性质、形成原理与柴油乳化的助燃消烟作用,使学生通过实验,加深了解物理化学原理在不同领域的综合应用,关注社会、关注环境.教学实践结果表明,本实验设计科学合理,可作为物理化学实验课程中综合创新实验开设. 相似文献
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双环戊二烯与一个亚铁离子形成夹心状分子结构赋予二茂铁许多优良性能。二茂铁基聚合物制备工艺成为了二茂铁及其衍生物研究的热点,其制备的功能材料可应用于电化学、光学材料以及生物材料等多个领域。对近年来二茂铁基聚合物的制备、性能以及应用等方面研究现状进行综述,并对未来研究方向做出展望。 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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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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《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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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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Sister Carrie is one of the most controversial characters in American literature.Thought as a "fallen woman" firstly,she was defined as a "new woman" by some critics later. However, by digging into the motivaton behind the whole process of Carrie's "success", the relationship between Carrie and her creator (the author), the social conditions of then American, it can be found that Carrie has never been free-standing on her thought and she has never found her real-sdf even after becoming a famous actress. In a society dominated by mass consumerism Carrie is only an adherent of her own desires. She also is a representative of all those country girls flooded into cities, a symbol and a sacrifice of the urbanization of America in a time countryside was overcome by cities. 相似文献
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RUZBEHANI Mohsen 《重庆大学学报(英文版)》2004,3(1):20-25
1.IntroductionOne-cyclecontrolmethod,whichwasproposedaboutonedecadeago[1],hasbecomeanattractivemethodinspecialfieldssuchaspowerfactorcorrection[2-6],switchingamplifiers[7,8],etc.Themainideaofthiscontrollerisbasedonintegrationofdiodevoltageinone-cycleandforcesittobeexactlyequaltothereferencevalue.Themainadvantageofthiscontrollerisitsrealtimeabilitytorejectthevariationofinputvoltage[1].Despitethisgreatability,ithasnogoodperformancesinrejectingofloaddisturbanceandfollowingreferencecommands.Espec… 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