Kinetics study on biomass pyrolysis for fuel gas production

INTRODUCTIONSincebiomassisanabundant,inexpensiveandrenewableresource ,itsconversiontosyn theticfuelsandchemicalproductsappearsat tractive.Amongallkindsofbiomassconversionroutes,pyrolysisisbeinggivenincreasingatten tionsincetheprocessissimpleandmaybeopti m…     

The Reflection of Cultural Differences in a Joint Performance

Cultureisoneofthemostdifficulttermstobewelldefined.NewWebstersDictionarysaysitisnotonly"theacquiredabilityofanindividualorapeopletorecognizeandappreciategenerallyacceptedestheticandintellectualachievementofcivilizationoraparticularstageorstagesofcivilizationasinthecaseofacertainnationorperiod"butalso"thetotalofhumanbehaviorpatternsandtechnologycommunicatedfromgene-rationtogeneration".Thelatterisananthropologicalandsociologicaldefinition,whichagreeswithLongmanModernEnglishDictionary'sthirddef…     

Equivalent Kelvin Impact Model for Seismic Pounding Analysis of Bridges

Based on Hertz contact theory, a method to determine the parameters of Kelvin impact model for seismic pounding analysis of bridges is proposed. The impact stiffness of Kelvin model is determined by the ratio of maximum impact force to maximum contact deformation, which is calculated based on Hertz contact theory with considering the vibration effect. The restitution coefficient which has great influence on the damping coefficient of Kelvin impact model is investigated by numerical analysis. Numerical results indicate that the impact stiffness of Kelvin impact model increases with the increment of the Hertz contact stiffness, approaching velocity or the length ratio of short to long girders. Vibration effect has remarkable influence on the impact stiffness and cannot be neglected. The restitution coefficient decreases when approaching velocity increases or the length ratio of short girder to long girder decreasing. The practical ranges of impact stiffness and restitution coefficient are obtained as 3×108-6×108 N/m and 0.6-0.95 respectively.     

文化的核心

在中国,英语专业的学生通常要学很多门"外国文化"课,学得最多的是英国和美国文化概况.如今,不管是谁,只要对此加以关注,就不应该仅仅认识到文化课所传递信息的重要,更应该能明确列举出开设这些课所要达到的目标.     

基于良构和劣构问题求解的教学设计模式(下)

虽然大多数教育家认为问题求解能力是最重要的学习结果 ,但在教学设计研究中却很少涉及问题求解的教学设计问题。本文的探究力图弥补这一不足。我们认为 ,问题可以分为良构问题 (well- structured prob-lem)和劣构问题 (ill- structured problem)两大类型。良构问题是指限定性条件的问题 ,它具有明确的已知条件 ,并在已知条件范围内运用若干规则和原理来获得同一性的解决方法 ;劣构问题的特点是具有多种解决方法、解决途径和少量确定性的条件 ,这些条件不仅不易操作 ,而且包括某些不确定性因素 ,如哪些概念、规则和原理对求解方法是必要的 ,如何将它们组织起来 ,哪种解决方法最为合适等等。对于这两大类型问题 ,本文分别讨论了学习者问题求解的模式和相应的教学设计模式 ,以支持学习者问题求解技能的发展。良构问题的求解模式是以信息加工学习理论为基础的 ,而劣构问题的求解模式则是基于一种新兴的劣构问题求解理论、建构主义和情境认知学习理论。     

改进学校课程和提高教学质量

学校必须传授给学生们以符合现代科学进展、符合辩证唯物主义世界观和共产主义道德等客观实际的深刻而长期有用的知识,并且必须进行劳动教育,培养劳动习惯和爱劳动的情感。实现这一目的的途径之一就是改进普通中学的课程和教科书。在已公布的课程标准(即教学大纲)的章、节、课题的说明中预先指出了学生务必学到的要点,同时按照学校集体能力的实际情况,确定补充的或次要的内容。这一关于课程的改进是为了减轻学生的过重负担,同时也指明了所有学生可以掌握的并且必定能达到较高水平的一定量的基本教材的内容。     

On the Nature and Role of English in Asia

The present paper is divided into eight sections:introduction,the global diffusion of English,perceptions of the new varieties,the issue of intelligibility,features that cause unintelligibility,need for a broader pragmatics,and pedagogical impli- cations,and conclusion,followed by the references.Not surprisingly,the global spread of English has generated varying perspec- tives on the nature and functions of its acculturated varieties.Broadly speaking,the debate has divided scholars into two camps holding diametrically opposing views on the multiple versions of English.On the one hand,some scholars view variations as symp- toms of linguistic degeneration and deterioration;on the other hand,some scholars legitimize them as inevitable manifestations ne- cessitated by the demands of the new cultural contexts.The normative view of the former camp stems,at least partly,from the problems the new forms of English pose in terms of international intelligibility.It is in this context that the paper examines the traditional,one-sided,native speaker-centred idea of intelligibility and the recent two-sided view of intelligibility that places the onus on both the native speaker and the non-native speaker.The argument of the latter camp is based on the premise that the new varieties require a broader pragmatic framework,because universal pragmatics is inadequate to describe them satisfactorily. Thus,the camp advocates a need for a language specific pragmatics,and a comparative pragmatics,in addition to the traditional universal pragmatics.Logically,the debate on phonological,lexical,grammatical,and discourse structure variations,and their le- gitimacy has prompted English language teaching specialists to have a fresh look at the goals and objectives of teaching English in the countries of the outer and expanding circles,and accordingly prioritize the teaching of national and regional varieties over that of the so-called native varieties.Thus,the paradigms of independence and centrality of the new varieties are replacing the paradigms of their dependence and marginality.     

飞驰在虚拟与现实之间

每种赛车类游戏的开头都会有这样一句话：“注意，在现实生活中千万不要这要驾驶。”然而，我们却偏要那么做。     

格林柯尔系挑战海尔神话--冰箱业资产重组搅动竞争格局

我们关注的是2001年格林柯尔收购科龙以及其在2003年收购美菱的事件及其影响，运用部分财务数据以及图表进行比较分析，说明整合后的格林柯尔系作为冰箱行业的后起之秀如何与该行业领军人海尔竞争，成为海尔在冰箱产业最强大的对手，并根据相关分析对冰箱产业的未来格局进行了预测。     

用DREF-Ⅲ摩擦纺多组分纬纱织造的织物风格特征

织物风格特征是由织物组织结构和纱的特性决定的，新型纱线结构的不断出现和发展对织物性能和质量提出了更高的要求。研究表明：通过改变纺纱工艺可以获得不同的纱线结构，从而改变织物的风格特征。DREF-Ⅲ型摩擦纺包芯纱具有典型的皮芯结构，可以是双组分也可以是多组分，而且组分的不同会对织物性能产生不同的影响，纱的性能也会由于芯皮之间压力、摩擦力大小的不同而改变。以前的研究主要集中在包芯纱的拉伸性能上，而对空心纱几乎没有什么新的研究和讨论。