TiSiW12O40／TiO2催化合成氯乙酸丙酯

首次报道了以固载杂多酸盐TiSiW12O40/TiO2为多相催化剂，通过氯乙酸和丙醇反应合成了氯乙酸丙酯，并探讨了诸因素对产率的影响。实验表明：TiSiW12O40/TiO2是合成氯乙酸丙酯的良好催化剂，最佳反应条件为：醇酸物质的量比为1．4：1，催化剂用量为反应物料总量的2．0％，反应时间2．0h，反应温度95－110℃。上述条件下，氯乙酸丙酯的产率可达77．14％。     

固载杂多酸盐催化合成苯甲酸异戊酯

首次报道了以固载杂多酸盐TiSiW12O40/TiO2为多相催化剂，对以苯甲酸和异戊醇为原料合成苯甲酸异戊酯的反应条件进行了研究，实验表明：TiSiW12O40/TiO2是合成苯甲酸异戊酯的良好催化剂，最佳反应条件为：醇酸摩尔比为4：1，催化剂用量为反应物料总量的2.5％，反应时间为2.5h，上述条件下，苯甲酸异戊酯的产率可达83.3％。     

TiSiW12O40/TiO2催化合成甲酸丁酯

介绍了新型催化型TiSiW12O40/TiO2的制备方法，实验考察了以自制的该催化剂催化合成甲酸丁酯的酸醇化，催化剂用量，反应时间等因素对反应产率的影响，实验表明：在酸醇物质的量比为2．5：1，催化剂用量为反，反液的1．78％，酯化反应时间为40min，反应温度为94－98℃时，反应产率可达72．2％。     

TiSiW12O40/TiO2的制备及其光催化性能的研究

制备了纳米复合催化剂TiSiW12O40/TiO2,利用IR、XRD和TEM对其进行了表征.研究了钨硅酸的负载量、溶液pH值、溶液浓度、光照时间等对TiSiW12O40/TiO2光催化降解亚甲基蓝的影响.TiSiW12O40/TiO2光催化降解亚甲基蓝的反应符合一级反应动力学.     

二氧化钛负载磷钨杂多酸催化合成环己酮1,2-丙二醇缩酮

以H3PW12O40／TiO2为催化剂催化合成了环己酮1，2-丙二醇缩酮，探讨了H3PW12O40／TiO2对缩酮反应的催化活性，较系统地研究了酮醇物质的量比，催化剂用量，反应时间诸因素对产品收率的影响．实验表明：H3PW12O40／TiO2是合成环己酮1，2-丙二醇缩酮的良好催化剂，在n（环己酮）：n（1，2-丙二醇）=1：1．7，催化剂用量为反应物料总质量的0．5％，环己烷为带水剂，反应时间1．0h的优化条件下，环己酮1，2-丙二醇缩酮的收率可达83．7％．     

杂多酸盐催化剂催化合成丁酸乙酯

首次以杂多酸盐TiSiW1 2 O40 /TiO2 为催化剂催化合成了丁酸乙酯 .结果表明 :TiSiW1 2O40 /TiO2 具有良好的催化活性 ,乙醇和正丁酸的摩尔比为 1.5∶1,催化剂用量为反应液总量的1.0 % ,酯化反应时间为 1.5h ,反应温度为 93～ 96℃ ,丁酸乙酯的产率可达 75.6 % .     

磷钨酸催化环己酮氧化合成己二酸

以质量分数为30%的H2O2为氧化剂,在没有任何有机溶剂或助催化剂存在的情况下,考察了磷钨酸催化环己酮氧化合成己二酸的活性.结果表明,磷钨酸在环己酮氧化合成己二酸的过程中显示了较高的催化活性.研究了催化剂用量、过氧化氢用量、温度、时间等因素对磷钨酸催化活性的影响.反应的适宜条件为：n（环己酮）：n（H3PW12O40）：n（H2O2）=150：0.5：587,反应温度为92 ℃, 反应时间为8 h, 己二酸的收率可达60.6%.     

复合无机盐催化合成己二酸二正辛酯

经复合得到Fe2（SO4）3-K2SO4催化剂,并由己二酸和正辛醇为原料合成己二酸二正辛酯,研究了酯化反应的影响因素．结果表明,该催化剂对酯化反应具有良好的催化活性．合成己二酸二正辛酯的最佳条件是：己二酸的物质的量为0．05mol,醇酸物质的量比为2．2：1,催化剂用量为1．1g,反应温度为85～100℃,带水剂环己烷为10mL,回流分水约1．5h,此时酯化率可达92．2％．     

H3PW（12）O（40）在H2O2催化氧化环己酮合成己二酸中的应用

以H3PW12O40为催化剂,30%H2O2为氧源,催化氧化环己酮合成己二酸.探讨了H3PW12O40对氧化反应的催化活性,较系统地研究了磷钨酸用量、反应温度、H2O2用量、KHSO4用量等因素对产物收率的影响.实验表明：H3PW12O40是合成己二酸的良好催化剂;在n（环己酮）∶n（H2O2）∶n（H3PW12O40）∶n（KHSO4）=100∶388∶0.035∶0.74（固定环己酮用量为0.10 mol,磷钨酸用量0.1g,H2O2用量40 mL,KHSO4用量0.1 g）,反应温度为100℃,反应时间6 h的最佳条件下,己二酸的收率可达49.5%.     

TiSiW_(12)O_(40)/TiO_2催化合成氯乙酸丙酯

首次报道了以固载杂多酸盐TiSiW12 O4 0 /TiO2 为多相催化剂 ,通过氯乙酸和丙醇反应合成了氯乙酸丙酯 ,并探讨了诸因素对产率的影响 .实验表明 :TiSiW12 O4 0 /TiO2 是合成氯乙酸丙酯的良好催化剂 ,最佳反应条件为 :醇酸物质的量比为 1 4∶1,催化剂用量为反应物料总量的 2 0 % ,反应时间 2 0h ,反应温度 95 - 110℃ .上述条件下 ,氯乙酸丙酯的产率可达 77 14% .     

卡思卡特城堡

It is worthy of noting that, whilst Crookston Castle witnessed the earlier and happier portion of Mary's variegated life,     

不同的吃喝玩乐

一、吃和喝吃苹果 eat an apple, 吃药 take medicine,吃糖 have some sweets,吃饭 have one's meals,吃馆子 dine out,吃惊 be surprised/     

漏洞百出的教育

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?     

只要努力,不要后悔

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.     

浅谈移民问题

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.     

Sister Carrie, an Adherent of Desires

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.     

Improvement of one-cycle controller by use of proportional integral differential controller

1.IntroductionOne-cyclecontrolmethod,whichwasproposedaboutonedecadeago[1],hasbecomeanattractivemethodinspecialfieldssuchaspowerfactorcorrection[2-6],switchingamplifiers[7,8],etc.Themainideaofthiscontrollerisbasedonintegrationofdiodevoltageinone-cycleandforcesittobeexactlyequaltothereferencevalue.Themainadvantageofthiscontrollerisitsrealtimeabilitytorejectthevariationofinputvoltage[1].Despitethisgreatability,ithasnogoodperformancesinrejectingofloaddisturbanceandfollowingreferencecommands.Espec…     

库克斯顿城堡

城堡, 是欧洲典型的建筑之一, 每个城堡都有一个美丽的传说或是一段历史。从本期开始, 我们将推出“城堡之旅”, 带各位读者去浏览、观赏欧洲各地的城堡, 开始一段文化与历史的旅途!     

The Reader Response Approach to Teaching of English Literature

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.