The Evaluative Function of English Progressive Aspect

本文从分析英语进行体的意义及其与动词类型的关系入手,探讨英语进行体的评价功能。旨在说明英语进行体不仅是人类时间经验的外在表现形式,表达语言的概念功能,而且是说话者在语言交际使用过程中,根据言语情景及言语意图所做的有意义的选择;它体现一定的评价功能,表达说话者对交际事件的态度、判断和介入。This paper intends to explore the evaluative function of English progressive aspect.By analyzing the meaning of progressive aspect and the relationship between progressive aspect and verb types,the paper demonstrates that English progressive aspect is not only formal expression of the human experience of time,but also a meaningful choice by which the speaker expresses his personal attitude,judgment and involvement in speech events

A Multimodal Analysis of Genres: A Case Study of English Psychology Textbooks

摘要 本文以英文心理学教科书为语料，在系统功能语言学的理论框架下探讨多模态和语类之间的相互建构关系，并由此展现心理学教材的语篇特征。本研究旨在说明：教材的多模态特征是由语类建构的，语类由语言和图像模态共同体现的。 本研究根据马丁的语类理论，辅之于视觉文化和视觉设计领域的研究成果，辨别、细数、分析了心理学教材中出现频率较高的四种语类和六种图类，并根据它们在页面中的具体呈现分析了它们之间的互动关系。本文采取定性和定量相结合的研究方法。 文献表明有关多模态，语类及教科书各自的研究已经取得了瞩目的成果，但将三者结合进行探讨还为数不多。许多问题，如教科书作为宏观语类是如何通过多模态特征体现其学科特...Abstract Taking English psychology textbooks as research data, this research attempts to explore multimodality, genre, and their mutual constructions, within the theoretical framework of systemic functional linguistics. The objective of this research is to articulate how multimodal features are generically constructed, and how genres are multimodally realized. Based on Martin’s genre theory and...学位：文学博士院系专业：外文学院英语语言文学系_英语语言文学学号：1202008015046

Investigation and Comparison of Metadiscourse in Philosophical Discourse and Scientific Discourse

HylAnd(1999,2005)通过对学术论文语篇的元语篇分布情况的实证分析探讨哲学语篇和科学语篇异同。本文认为学术论文是集学术语篇和学科语篇为一体的文本,无法清晰的反映哲学语篇和科学语篇其本身固有的特点。本文通过直接考察科学著作和哲学著作的人际元语篇的分布情况指出:科学语言的元语篇的使用具有中立性的特点,其主旨是组织语篇,使之具有语篇性;哲学语篇中的高值情态使用率较高,哲学的“先验“性使得其语言主观、精炼、肯定。Hyland(1999,2005) discusses the distribution of metadiscourse in philosophical discourse and scientific discourse.This paper holds that disciplinary discourses fused into academic papers could not manifest their true features.Through the analysis of the lexical-grammatical features in these two discourses,the paper points out that the function of metadiscourse for scientific discourse is to organize the discourse and thus give the texture to it,and that for philosophical discourse is to express the subjective,precise and non-negotiated argument due to the transcendental feature of philosophy

Tomato microtubule-associated protein end-binding protein 1 (EB1) mediates tolerance to salt stress

微管结构的动态受微管结合蛋白(Microtubule-associated proteins,MAPs)调控,在植物的生长发育和环境信号响应中有重要作用. EB1(End-binding protein 1)是微管正末端特异结合的MAP,蛋白同源序列比对搜索显示番茄基因组有2个EB1基因,SlEB1a(Solyc03g116370)和SlEB1b(Solyc02g092950).构建SlEB1a基因的过表达番茄植株和同时干涉SlEB1a基因和SlEB1b基因的RNAi番茄植株,并分析它们对微管解聚药物戊炔草胺和盐胁迫的敏感性.结果证明番茄微管结合蛋白EB1(SlEB1)在盐胁迫应答中有重要作用.与野生型番茄植株相比,过表达番茄植株对1 mumol/L微管解聚药物戊炔草胺更加敏感,而RNAi植株对1 mumol/L戊炔草胺更加耐受,与此相反,过表达番茄植株对100 mmol/L NaCl更加耐受而RNAi番茄植株对100 mmol/L NaCl更加敏感.因此,SlEB1可能通过负调控番茄周质微管的稳定性而正调控番茄对盐胁迫的应答;本研究结果可为进一步研究植物周质微管动态在盐胁迫应答中的作用机制奠定基础

Adsorption Performance of Arsenic(Ⅲ) in Water on Hyperaccumulating Plant-Pteris vittata

采用流动注射-氢化物发生-电热石英管原子吸收光谱法研究了超富集植物蜈蚣草对水中As(Ⅲ)的吸附行为。探讨了蜈蚣草的前处理方法、溶液pH值、吸附时间、吸附剂用量、As(Ⅲ)浓度和溶液体积等因素对蜈蚣草吸附As(Ⅲ)的吸附率的影响。结果表明,以50 mg经2 mol.L-1HCl洗脱处理后的蜈蚣草粉末为吸附剂,在pH为2.0、As(Ⅲ)浓度为20 ng.mL-1、溶液体积50 mL、吸附时间15 min条件下,蜈蚣草对As(Ⅲ)的吸附率可达86.1%,水中残余As(Ⅲ)仅为2.8 ng.mL-1。本法成本低廉、操作简便,可望直接用于地下水中As(Ⅲ)的去除。The adsorption performance on As(Ⅲ) in water with Pteris vittata(hyperaccumulating plant) was studied.The concentration of As(Ⅲ) in water was determined by flow injection-hydride generation-atomic adsorption spectrometry(FI-HG-AAS).The influence factors,including the pre-treatment of Pteris vittata,pH value,concentration of adsorbate,sample volume,adsorption time and amount of adsorbent were studied.The adsorption ratio of 20 ng/mL As(Ⅲ) with Pteris vittata(L) which was pre-treated by 2 mol/L HCl was 86.1% and the residual concentration of As(Ⅲ) was reduced to 2.8 ng/mL under the optimum conditions.The method was economical,manipulated simple and convenient,which could be used to remove As(Ⅲ) of groundwater directly,and met the standards of drinking water made by EU,EPA and WHO.国家自然科学基金(No.40506020

From nature reserve to national park system pilot: Changes of environmental coverage in the Three-River-Source National Park and implications for amphibian and reptile conservation

三江源地区具有丰富的高原生物多样性,是我国重要的生态安全屏障。作为我国第一个体制试点的国家公园,三江源国家公园将被建成青藏高原大自然保护展示和生态文化传承区。为更好地服务于三江源国家公园建设,本研究从海拔、年均温和年降水等方面,在环境空间上系统比较了国家公园与三江源和可可西里自然保护区的差异;以4种两栖爬行动物即高原林蛙(Rana kukunoris)、倭蛙(Nanorana pleskei)、西藏齿突蟾(Scutiger boulengeri)和青海沙蜥(Phrynocephalus vlangalii)分布点环境条件在国家公园内外的异同为例,探讨分布受环境制约大、扩散能力弱的物种保护在国家公园建设中可能面临的机遇和挑战。结果表明,国家公园与已建自然保护区在地理空间上重叠较大,但它们在自然环境上的差别很明显;自然保护区内两栖爬行类所偏好的环境条件较多未包含在国家公园内。鉴于三江源的区位特殊性及对气候变化的敏感性,区域内两栖爬行动物等对环境依赖性强、扩散能力弱物种的有效保护不仅有助于保持物种遗传多样性和区域生态系统的完整性,也有利于更好地实现国家公园目标定位并服务于生态文明建设。为此,在国家公园内,应开展两栖爬行动物种群动态和群落结构的长期监测,加强基础生物学研究,掌握环境变化对两栖爬行动物分布、遗传、行为、形态、种群动态及群落可能产生的影响,实现区域内两栖爬行动物及其类似物种在环境变化下的永续生存

JUNO Sensitivity on Proton Decay p→νˉK+p\to \bar\nu K^+ Searches

The Jiangmen Underground Neutrino Observatory (JUNO) is a large liquid scintillator detector designed to explore many topics in fundamental physics. In this paper, the potential on searching for proton decay in $p\to \bar\nu K^+$ mode with JUNO is investigated.The kaon and its decay particles feature a clear three-fold coincidence signature that results in a high efficiency for identification. Moreover, the excellent energy resolution of JUNO permits to suppress the sizable background caused by other delayed signals. Based on these advantages, the detection efficiency for the proton decay via $p\to \bar\nu K^+$ is 36.9% with a background level of 0.2 events after 10 years of data taking. The estimated sensitivity based on 200 kton-years exposure is $9.6 \times 10^{33}$ years, competitive with the current best limits on the proton lifetime in this channel

JUNO sensitivity on proton decay p → ν K + searches*

The Jiangmen Underground Neutrino Observatory (JUNO) is a large liquid scintillator detector designed to explore many topics in fundamental physics. In this study, the potential of searching for proton decay in the $p\to \bar{\nu} K^+$ mode with JUNO is investigated. The kaon and its decay particles feature a clear three-fold coincidence signature that results in a high efficiency for identification. Moreover, the excellent energy resolution of JUNO permits suppression of the sizable background caused by other delayed signals. Based on these advantages, the detection efficiency for the proton decay via $p\to \bar{\nu} K^+$ is 36.9% ± 4.9% with a background level of $0.2\pm 0.05({\rm syst})\pm$$0.2({\rm stat})$ events after 10 years of data collection. The estimated sensitivity based on 200 kton-years of exposure is $9.6 \times 10^{33}$ years, which is competitive with the current best limits on the proton lifetime in this channel and complements the use of different detection technologies