237 research outputs found

    Basic-level Categories and the Optimization of the Macrostructure of Onomasiological Learner’s Dictionaries: a Case Study of the Second Edition of Longman Language Activator

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    学习型类义词典由概念至词汇,微观结构信息丰富,兼具类义词典和学习型词典的特点,可满足中高阶英语学习者的产出需求。过去对学习型类义词典的研究,抑或对类义词典的研究,主要集中于词汇关系。就词典本身而言,虽然从概念到词汇的顺序符合英语学习者的表达过程,但在编排上往往设置了一套分层系统,而非按学习者熟悉的字母顺序编排。因此,学习者在实际使用过程中往往感到无从下手,这大大降低了学习型类义词典的使用效果。本文借助认知语言学中的基本层次范畴概念构建理论框架,探讨基本层次范畴将如何优化学习型类义词典,尤其是该类词典的宏观结构,使其进一步具备用户友好的特征。 本文针对《朗文英语联想活用词典》(第二版)进行了个...Arranged from concepts to words and characterized by a detailed microstructure, the onomasiological learner’s dictionary combines features of both the onomasiological dictionary and the learner’s dictionary. It functions to fulfill the production needs of intermediate and advanced EFL learners. Previous studies of the onomasiological learner’s dictionary or the onomasiological dictionary as a whol...学位:文学硕士院系专业:外文学院_英语语言文学学号:1202014115270

    浅评英语同义词词典的编排

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    英语同义词辨析对英语学习者英语水平的进一步提升十分重要,同义词词典的使用在这一方面的学习中必不可少。一部编排得当的同义词词典能有效帮助用户快速获取信息,节约时间精力,同时也能带来美的感受。该文主要从索引系统、词条组织、版面设计三方面分析了《牛津英语同义词学习词典》的编排设计,着重指出《牛津英语同义词学习词典》在编排上的创新性,希望对今后英语同义词词典,尤其是同义词学习词典的编纂有所启发

    On Blow-up Rate of Solution of Semilinear Parabolic Equations System

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    本文将对某一类半线性抛物型议程组在解的单点爆破情况下,估计当点邻近短爆点时,解的爆破率。In this paper we carry on the literature [5],to study the Blow-up rete of solution For some semilinear parabolic equation in the cases of the single point Blow-up near the Blowup point

    肢体残疾职业成功者社会支持、应对方式和人格特征的相关研究

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    我国目前有残疾人8296万人,其中肢体残疾者2412万人,占29.07%,在各类残疾人中居第一位。职业成功的定义是:一个人在职业生涯发展的过程中所累积起来的积极的心理上或是与工作相关的成果或成就&ldquo;。职业成功的标准根据评价主体的不同,分为客观标准和主观标准。客观标准是客观和可见的标准,如创造财富的数量、获得的各种奖励、晋升次数等;主观标准是个体对自身成功与否的主观感受,如工作满意度、自我实现感等。目前国内对于肢体残疾职业成功者的研究较少,对他们的社会支持、应对方式和人格特征还不十分清楚。对这个问题做进一步研究,将为众多肢体残疾者,包括汶川和玉树地震新造成的肢残者早日适应残疾,取得职业成功提供帮助。</p

    家族主义文化、“去家族化”治理改革与公司绩效

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    儒家文化倡导重家族、重血缘的家族主义价值观。本文研究家族企业创始人的家族主义文化观念对公司上市前"去家族化"公司治理改革和上市后公司绩效的影响。研究发现:首先,创始人的家族主义文化观念越强,家族企业在上市前越不可能实施"去家族化"治理改革,即家族成员从管理岗位离职的概率越低,家族对公司的控制权、现金流权以及两权分离度的下降幅度也越小。其次,公司所在地的劳动力市场越不发达,或家族成员教育背景越差时,创始人的家族主义文化观念对"去家族化"治理改革的阻碍作用越强。进一步研究还表明,是家族内部的言传身教,而非社会环境的熏陶塑造了企业创始人的家族主义文化观念,进而影响家族企业的"去家族化"改革。最后,本文发现公司上市前"去家族化"治理改革实施得越不彻底,上市后公司绩效和收入增长率就越低。综上,本文研究结果为儒家家族主义文化影响经济发展提供了来自微观企业层面的证据。国家自然科学基金重大项目(71790600,71790601);;国家优秀青年科学基金项目(71722012);;国家自然科学基金重点项目(71532012);;教育部哲学社会科学研究重大课题攻关项目(15JZD019)的资

    Catalytic Properties of Ultrafine SiO_2 Supported Amphiphilic Phosphine-Rh Complex Catalysts

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    作者简介: 彭庆蓉( 1973- ) , 女, 四川达州市, 讲师, 博士。 通讯联系人:袁友珠[中文文摘]针对均相催化反应后催化剂与产物分离困难和高碳烯烃在水-有机两相中反应速率较低的问题,采用水-有机两亲膦铑络合物负载到超细SiO2载体上催化1-己烯氢甲酰化反应,并与超细SiO2制备负载水相催化剂比较,超细SiO2负载型两亲铑膦络合物催化剂表现出较高的1-己烯氢甲酰化反应活性和选择性,且含水质量分数范围较宽,反应后产物与催化剂容易分离。两亲膦铑络合物超细SiO2负载液相催化剂可避免超细SiO2负载水相催化剂循环使用时水分被提取到有机相的缺点,同时获得较高的氢甲酰化反应活性和选择性。[英文文摘]Because of the lower activity of higher olefins in aqueous/organic biphasic catalysis system and the catalyst separation of homogeneous catalysts,ultrafine SiO2 nanoparticles were used as supports to immobilize amphiphilic phosphine-complex to obtain supported catalysts for hydroformylation of 1-hexene. Compared to the supported aqueous-phase catalysts (SAPC) on ultrafine SiO2 support,the ultrafine SiO2-supported catalyst with amphiphilic phosphine-complex presented a higher hydroformylation performance over a relatively wider range of support hydration. Since the water was distilled to organic phase for more times recycled catalysts, the draw backs of ultrafine SiO2 supported water- soluble phosphine-Rh complexes catalyst could be avoided by using supported liquid- phase catalyst prepared by using amphiphilic phosphine- Rh complexes, obtaining higher activity and selectivity of hydroformylation.国家自然科学基金(20023001

    Neural mechanisms of 1-back working memory in intellectually gifted children

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    To investigate the neural mechanisms underlying intellectually gifted children, electroencephalograms (EEG) were recorded while 13 intellectually gifted children and 13 average children accomplished a 1-back working memory task. The results showed that intellectually gifted children elicited significantly shorter P3 latency than their intellectually average peers. These results support the neural efficiency theory that intellectually gifted individual can use their brain more efficiently

    The Species and Toxicities of Nassariidae Collected from the Coast of Southeast China Sea

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    为了解我国东南沿海地区织纹螺体内的毒素状况,利用生物法对采自我国东南沿海的织纹螺样品毒性进行了测定.实验结果和相关资料表明:织纹螺的毒性与其种类关系密切.光织纹螺(nASSArIuS ruTIlAnS)、正织纹螺(zEuXIS SCAlArIS)和节织纹螺(nASSArIuS HEPATICuS)为有毒织纹螺;纵肋织纹螺(nASSArIuS VArICIfEruS)、习见织纹螺(nASSArIuS dEAlbATuS)和胆形织纹螺(nASSArIuST HErSITES)为无毒织纹螺;方格织纹螺(nASSArIuS ClATHrATuS)、西格织纹螺(nASSArIuS SIQuInJOrEnSIS)、半褶织纹螺(nASSArIuS SEMIPlICATuS)、红带织纹螺(nASSArIuS SuCCInCTuS)、疣织纹螺(nASSArIuS PAPIllOSuS)、花织纹螺(zEuXIS CASTuS)、素面织纹螺(nASSArIuS SufflAyuS)和橡子织纹螺(nASSArIuS glAnS)毒性不明,可能为季节性有毒织纹螺.多种织纹螺的毒性变化规律目前尚不清楚,人们应尽量避免食用织纹螺.To investigate the distribution of toxic Nassarius in the southeast coast in China, we detected snail samples collected from these areas by bioassay.Results indicated that the toxicity of Nassarius was relative to species.Nassarius rutilans, Zeuxis scalaris, and Nassarius hepaticus were toxic gastropods, and Nassarius variciferus, Nassarius dealbatus, and Nassarius thersites were nontoxic gastropods, while the toxicity of Nassarius clathratus, Nassarius siquinjorensis, Nassarius semiplicatus, Nassarius succinctus, Nassarius papillosus, Zeuxis castus, Nassarius sufflayus, and Nassarius glans probably changed with the season.The change regularity of Nassarius's toxicity is still unknown.Therefore the best way to prevent humans from the harmful effects of Nassarius is to stop eating them.人事部留学回国人员科研启动基金资助项

    XH-2/3型组合式耐硫变换催化剂的试生产和工业应用

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    XH-3型催化剂是在XH-2型催化剂(Co-Mo-K/γ-Al2O3)的基础上引入第3种活性组分钨而制成的。通过活性评价和工业侧线试验,结果表明XH-2、XH-3型催化剂在最佳活性温区和耐热性能方面各具特色,可以进行组合填装使用。12 t XH-2/3型组合式耐硫变换催化剂已经成功应用于合成氨的变换工序中,能够达到生产工艺的要求
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