共查询到20条相似文献，搜索用时 62 毫秒
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采用离子交换树脂富集钌，钌的吸附率达98％以上。将树脂灰化，用极谱法测定，可以测定5ng／g的钌。标样分析结果与标准值吻合。 相似文献
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利用自制聚合硫酸铁处理高色度印染废水，研究了最佳实验条件。该方法工艺简单，药剂成本低，废水的COD去除率达70％以上，脱色率达98％以上，出水水质达到了国家印染废水排放二级标准。 相似文献
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对甲基苯磺酸催化合成丁二酸二丁酯 总被引：2，自引：0，他引：2
以丁二酸和正丁醇为原料，对甲基苯磺酸为催化剂合成了丁二酸二丁酯，考察了影响酯化率的各种因素，确定了最佳反应条件为：丁二酸用量0．05mol时，正丁醇与丁二酸的物质的量比为2．2，0．1g催化剂．5mL甲苯作带水剂，反应时间50min，酯化率达98％以上。 相似文献
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超声协同-钛铁双阳极电化学处理印染废水的研究 总被引：8，自引：1，他引：8
采用超声电化学联用技术，探索超声协同-钛铁双阳极电解体系降解印染废水。该系统集超声空化、阳极催化氧化、电生自由基氧化和电絮凝等组合物化技术于一体，降解含有碱性湖蓝-5B的印染废水。研究结果表明：对COD为5342．4mgL^-1的含碱性湖蓝-5B的印染废水的COD去除率达到90．2％，脱色率达到98．3％。 相似文献
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亚胺基二乙酸树脂 (D40 1 )对钕 (Ⅲ )的吸附在 pH =5 .73时最佳 ;2 98K时每克树脂的静态饱和吸附容量 1 79mg ;用 2 .0mol·L- 1 HCl解吸 ,解吸率达 1 0 0 %。 相似文献
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《广东广播电视大学学报》2011,20(4):113-F0003
管理工程系本着立足中山市、面向广东省的专业建设原则,致力于培养高技能应用型专门人才。现设有电子商务、物流工程技术和物流管理三个专业,毕业生双证书获取率达98％以上,就业率达98％。 相似文献
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利用废铁屑微电解-活性污泥法工艺对纺织印染废水进行处理。该工艺处理印染废水效果好、投资少，色度、BOD5和CODcr除去率分别达到94％、90％和92％以上，处理后的水质达到GB4287—92纺织印染工业废水排放的一级标准。 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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《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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唐芳 《读与写:教育教学刊》2008,5(6)
During interview with English majors, it was found that a majority of students expressed disappointment with their experience of English literature classes. Students' dislike of learning English literature appears to be the major problem of teaching English literature in China. Reader response approach is a good way to solve this problem. In this paper, I explain the rationale behind the reader response approach, such as its origin, definition, features, assumptions, and strategies. Then I illustrate how reader response approach works as a teaching strategy by presenting several teaching models. At last I evaluate its usefuiness for teachers and present the advantages of reader response approach in Chinese context. 相似文献