找到约10000个结果。
摘 要1. Introduction 11.1 Research Background 11.2 Need for the Study 11.3 Organization of the Thesis 22. Literature Review 32.1 Researches on the Idioms and Cognitive Metaphors 32.2 Definitions of English and Chinese Idioms 53.Similarities Between English and Chinese Idioms 63.1 Common Characteristics of English and Chinese Idioms in General 63.2 Common Metaphoric Features of English and Chinese Idioms 74. Differences between English and Chinese Idioms 94.1 Different Characteristics of English and Chinese Idioms in General 94.2 Different Metaphoric features of English and Chinese Idioms 94.2.1 Geographical differences 94.2.2 Historical differences 104.2.3 Religious difference 115. Conclusion 125.1 Major Findings of the Study 125.2 Implications for Teaching and Learning 13References 14Acknowledgments 16 AbstractIdioms are an important part of a language. Foreign language learners' understanding and mastery of idioms is very important for improving the use of language and thus enabli
摘 要二噁英被称为“世纪之毒”,人类轻微接触二噁英便会引起皮肤疾病,若长期或过度接触二噁英,则会降低人类的免疫力,从而造成不可逆的危害,影响人体和神经发育,甚至影响到人类后代的生存和繁衍;氮氧化物会麻痹人体里的中枢神经,影响人体的造血系统,对人体的各项脏器和血液组织有严重危害,还破坏了臭氧层,加速了酸雨的形成。NH3-SCR催化剂既能脱除氮氧化物(脱硝)又能催化分解二噁英,可脱除百分之八十五的二噁英,活性温度区在200~300℃之间,而其脱硝的活性温度为300~400℃,脱除率可达百分之九十五。本实验研究了V/TiO2、Mn/TiO2以及各比例的Mn-V/TiO2多种NH3-SCR催化剂的制备及其在200~300℃脱硝、脱除二噁英的各项情况,并用XRD、TPR和BET进行表征。由于二噁英毒性太大且成分复杂,所以用邻二氯苯作为替代物代替二噁英
摘 要随着工业的迅速发展,工业排放的尾气越来越得到重视,尾气中含有固体颗粒物以及有毒气体,严重污染环境和影响人们的身体健康。袋式除尘器对处理工业尾气具有很好的效果,由于滤料的限制,袋式除尘器不能有效处理烟气中的氮氧化物。聚苯硫醚(PPS)滤料具有耐高温、耐腐蚀性、抗水解以及良好的阻燃性等性能,研究有重要意义。将Mn基催化剂作为活性组分,本文采用柠檬酸法制备一系列Mn-Ce脱硝催化剂,发现当Mn/Ce摩尔比为2:3时NOx的脱效率最好,在150℃时接近100%。将上述制得的催化剂负载到酸化过的PPS上,利用SEM等方法对复合滤料的结构和性能进行了研究,经过对比发现当负载量200g/m2时,脱除NOx效率最高。经过一段时间后,发现脱硝性能下降,催化剂可能发生脱落,可将碳纳米管先进行酸化负载到PPSN上再负载Mn-Ce催化剂或者用TiO2
摘 要等离子体引发聚合由于不需要外加引发剂的特点而引起了学者们的关注。本论文介绍了低温等离子体的概念、等离子体引发聚合的特点及其影响因素。本研究以等离子体引发了甲基丙烯酸甲酯(MMA)的乳液聚合,研究了聚合动力学,并以FT-IR、NMR的方法对聚合产物进行了表征。研究发现Ln[M0]/[M]的值与聚合时间成线型正相关。等离子体引发聚合产生的活性种具有长寿命。随着等离子体功率的增加,反应转化率先增后减,在30W时达到极值。随着乳化剂用量提升,反应的转化率随之不断提升,转化率和乳化剂含量成正比。通过FTIR以及NMR的表征,发现等离子体引发单体MMA乳液聚合的产物与传统自由基聚合的PMMA结构相似。关键词: 低温等离子体 乳液聚合 乙烯基单体 聚合动力学 Polymerization behaviors of the vinyl monomer initiated by plasmaAbstractPlasma-initiated polymer
摘 要Mn基低温SCR催化剂以其优异的脱硝性能备受瞩目。本文通过浸渍法制备催化剂,不同Mn负载量对Mn/TiO2催化剂NO去除率显示出不同的效果,Mn(0.1)/TiO2表现出最佳活性,在此基础上掺杂金属Ce,Ce的掺杂能有效提高催化剂的低温活性,在150℃时脱硝率从67.7%提高到82.0%。同时对比分析浸渍法和柠檬酸络合法制备的Mn-Ce/TiO2的脱硝效率,结果显示两种方法在175℃左右脱硝率均达到了90%,但柠檬酸络合法在低温区间(50-150℃)表现出的更好催化活性。此外,本文进行了催化剂抗中毒测试,SO2和H2O都会对催化剂脱硝活性造成影响,但柠檬酸络合法制备的Mn-Ce/TiO2具有优良的抗硫抗水性能,SO2通入脱硝率能稳定在60%左右,H2O通入脱硝率能稳定在75%。关键词:低温SCR Mn 脱硝 Ce掺杂Study on Denitration and Sulfur Resistance of Mn Based Low Temperature SCR CatalystsAbstractThe catalyst
摘 要1. Introduction 21.1 Need for the study 21.2 Research purpose 21.3 Organization of the thesis 22. Literature review 42.1 Definition of anxiety and learning anxiety 42.2 Empirical studies of foreign language learning anxiety 42.2.1 Research on the behaviors of foreign language learning anxiety 42.2.2 Research on the causes of foreign language learning anxiety 52.2.3 Measures to decrease foreign language learning anxiety 53. Methodology 73.1 Research questions 73.2 Subjects 73.3 Instruments 73.4 Procedure 84. Results and Discussion 94.1 Results 94.1.1 Results of the questionnaire 94.1.2 Results of the Interview 104.2 Discussion 124.2.1 Strategies for reducing anxiety 125. Conclusion 165.1 Major findings 165.2 Limitations and suggestions for further study 16References 17Acknowledgments 19Appendix I Foreign Language Class Anxiety Scale 20Appendix II Records of interview 23AbstractIn our contemporary society, schools and families pay more and more attention to primary students’ En
摘 要1. Introduction 11.1 Research Background 11.2 Research Purpose 21.3 Structure of the Thesis 32. Literature Review 42.1 Overview of Vague Language 42.2 Previous Studies of Vague Language at home and abroad 42.3 Previous Studies of Translation Strategies of Vague Language 53. Vague Language in Cosmetic Advertisements 73.1 The Characteristics of Vague Language in Cosmetic Advertisements 73.1.1 Phonetic vagueness 73.1.2 Lexical vagueness 83.1.3 Syntactic vagueness 103.2 The Main Functions of Vague Language in Cosmetic Advertisements 103.2.1 Improving the efficiency of language expression 103.2.2 Enhancing the flexibility of language expression 113.2.3 Improving politeness 113.2.4 Advertisers’ self-protection 124. Translation Strategies of Vague Language in Cosmetic Advertisements on the basis of Functional Equivalence Theory 134.1 Functional Equivalence on Lexical Level 134.2 Functional Equivalence on Syntactic Level 144.3 Functional Equivalence on Stylistic Level 154.4 Summary 1
摘 要1. Introduction 11.1 Research background 11.2 Research purpose 21.3 Structure of the thesis 22. Literature Review 32.1 Overview of the images of the Chinese American women in Hollywood movies 32.2 Previous researches at home and abroad 33. An Analysis of the Images of Chinese American Women in Hollywood Movies from the Cross-cultural Perspective 53.1 The 20th century: Conquered women and professional prostitute with the negative imagination 53.2 After World War II: Hardworking women in the miserable land 73.3 After the 1980s: Women soldiers fighting side by side and heroines rescuing the West 83.4 The hidden factors contributing to theses changes 103.4.1 The political factors 103.4.2 The economic factors 114. Conclusion 12References 13Acknowledgments 14AbstractAs a symbol of American film industry, Hollywood has been shaping the images of Chinese women for a hundred year. In the early days, the image of Chinese women in Hollywood movies was too single and negative. However, rec
2019届毕业设计(论文)论文题目:南京某文化活动中心设计专 业: 土 木 工 程班 级: 土 木 15 09学生姓名: 朱 俊 杰学 号: 1801 1509 29指导老师:胡夏闽 谈滢涛 钱强 朱世宝2019年 6月项目钢筋框架体系;工程难点在于标准层采用压型钢板混凝土组合楼盖,设计时须考虑钢筋混凝土梁与压型钢板混凝土组合板的组合作用。本课题主要是进行设计,计算过程包括:结构布置、荷算、该框架的(包括载、活载、地震荷载)、内力组合、楼盖设计、框架梁、、组合次梁设计、及基础设计等部分。本计算书主要选取一榀框架进行结构设计,的平面布置之后算出竖向荷载(和活荷载)的内力,然后进行地震作结构设计。其中用的结构设计中,是的值通过移法求出结构的自振周期,接着按底法计算水平地下的层间剪力,进而移计算。利用
摘 要1. Introduction 11.1 Research background 11.2 Research purpose 11.3 Significance of the research 21.4 Research method 31.5 Structure of the thesis 32. Literature Review 52.1 Overview of metaphor studies 52.2 Previous research of idioms at home and abroad 82.2.1 The definition and features of idioms 8 2.2.2 Studies at home and abroad 93. A Cross-cultural Study of Conceptual Metaphors in English and Chinese Idioms 123.1 Universality of conceptual metaphors in English and Chinese idioms 12 3.1.1 Emotions 12 3.1.2 Color words 15 3.1.3 Animal words 16 3.1.4 Metaphors in political discourse 173.2 Cultural Variation of Conceptual Metaphors in English and Chinese Idioms 18 3.2.1 Social psychology 19 3.2.2 Geographic environment 20 3.2.3 Dominant sports events 23 3.2.4 Culinary culture 254. Conclusion 30References 32Acknowledgments 34 AbstractIdioms, as a concise and vivid way of expression, are fundamentally metaphoric. Lakoff and Johnson (1980) advanced the Conceptual Metaphor Theory:
加微信咨询
加QQ咨询
服务时间:09:00-23:50(周一至周日)