共查询到20条相似文献,搜索用时 31 毫秒
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[I].Synthesisandpalladium -catalyzedcross -couplingreac tionoftris[4 - (trimethylsilyl)furan - 3-yl]boroxineandtris[4 -(substituted)furan - 3-yl]boroxine .3,4 -Disubstitutedfuransareimportantbuildingblocksofhet erocycliccompounds,inacontinuationofthestudyonpossibleroutesto 3,4 -disubstitutedfuran ,Iwasinterestedinexploringtheroleofasilylgroupasapotentialdirectinggroupbecausesilylgroupsarewell-knownfortheir ( -donatingcharacter.Theirtendencytostabilizea ( -carbocationthroughtheso -called (p - (… 相似文献
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《International Journal of Educational Development》2000,20(5):423-425
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Chris Travell 《Emotional and Behavioural Difficulties》2013,18(3):345-347
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fixation rate and color fastness,but the Lanasol type of wool fiber used reactive dye is not so applicable to dye the soybean protein fiber.0针织工业Knittin 相似文献
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Andrew T. Knudsen 《Paedagogica Historica: International Journal of the History of Education》2016,52(5):507-524
AbstractWhen historians discuss the impact of examinations on elementary education in mid-Victorian England and Wales they typically focus on the Revised Code of 1862. The Revised Code is famous for instituting a policy of “payment-by-results” for teachers in state-supported voluntary schools. “Payment-by-results” made government grants to schools – and, by extension, for teachers’ salaries – contingent upon student attendance and pass rates in reading, writing and arithmetic. As this article emphasises, however, “payment-by-results” was not the first, or even the most significant, instance in which competitive examination was used by the state as an instrument for establishing the pedagogical fitness and salaries of teachers. Less often explored by historians is the formative role that state-mandated competitive examinations for teachers played in developing a professionally aspirant body of schoolteachers and, consequently, the schoolteachers’ later role in developing competitive examination as a broad-scale national accreditation apparatus. But while the use of competitive examinations came to shape modern British academic and professional life in fundamental ways, the strengthening effects that they had for certain occupations and institutions, such as physicians, civil servants and middle-class secondary schools, were in fact ultimately denied to state teachers and the elementary education sector generally. With the introduction of “payment-by-results” in 1862, competitive examinations were converted into an instrument that weakened rather than strengthened teachers’ professional identity and policy influence. This article explains how the nineteenth-century English state structured examinations and examination results to manipulate the professional status of teachers in order to suit state priorities during different stages of national development. This historical narrative is framed in reference to present-day examination-based reforms of teacher compensation systems such as performance-related-pay and value-added modelling. 相似文献
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Luke Santamaria 《Technology, Pedagogy and Education》2013,22(4):529-531
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ThisstoryisaboutfourFloridafirefightersnamedEverybody,Somebody,Any-bodyandNobody.Therewasanimportantjobtobedone.Everybodywasaskedtodoit.EverybodywassurethatSome-bodywoulddoit.Anybodycouldhavedoneit.ButNobodydidit.SomebodygotangrybecauseitwasEverybody'sjob.Ev-erybodythoughtAnybodycoulddoit.NobodyrealizedthatEv-erybodywouldn'tdoit.Itend-edupthatEverybodyblamedSomebody,whenactuallyNo-bodyblamedAnybody.参考译文:这个故事讲的是佛罗里达州的四名消防队员,他们的名字分别是… 相似文献
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This story is about four Florida fire fighters named Everybody, Somebody, Anybody and Nobody. There was an important job to be done. Everybody was asked to do it. Everybody was sure that Somebody would do 相似文献
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英语中的连词是一种虚词,在句子中不单独用作句子成分。连词按其性质可分为并列连词和从属连词。and,but,so,or就是大家所熟知的并列连词,在小学课文中接触过,也学习过。今天在这里简单地归纳总结。下面请四位连词先生作个自我介绍吧。 相似文献