CO催化氧化的实验与Monte Carlo模拟

主要对CO在Pt表面催化氧化反应的实验做了具体描述,介绍以ZGB模型为基础的MC模拟方法,得到一系列与实验较接近的模拟结果.在模拟中,重点考察重构表面的诱导相变和反应物的脱附等因素对反应的影响.     

中国通信设备与制药产业创新系统比较研究

通信设备产业和医药产业都是中国重点支持发展的高新技术产业,但两个产业的差异也显而易见:通信设备产业具备较强的创新能力,无论是企业竞争力还是企业创新成果都从最初的毫无国际影响发展到处于国际领先水平。本文运用产业创新系统框架,对两个产业进行了比较分析。研究认为,产业知识基础(如技术机会)、行为人和网络(如市场需求、研发合作、政府支持等)和制度基础(如知识产权制度)三个方面能够一定程度的说明两个产业创新能力产生差异的原因。     

兰州市幼儿体质现状调查的必要性及意义

幼儿体质的好坏直接影响着他们今后的生活、学习、工作质量以及心理反应。论文结合实际,深入分析了兰州市开展幼儿体质状况调查的必要性和意义。     

浅谈杜十娘人物形象的悲剧性

杜十娘是我国文学史上为数不多的经典悲剧形象之一。虽是风尘女子,但她的勇敢刚烈、执着善良、恩怨分明却令很多读者为之震撼。在《杜十娘怒沉百宝箱》中对杜十娘爱情悲剧的描写,可谓"极摹人情世态之歧,备写悲欢离合之致",本文将分别从其身世经历、性格、爱情及理想几方面对其悲剧性加以分析。     

普通逻辑基本规律教学摭谈

在同一律教学中 ,要注意讲清什么是“同一思维过程”、什么是“A是A”以及“合理违反同一律”的特殊情况。在不矛盾律教学中 ,要注意讲清“看似矛盾 ,实质上并不矛盾”的概念或判断 ,注意分析具有隐蔽性的逻辑矛盾。在排中律教学中 ,对人们的某些思维或表述 ,要结合语言环境加以分析 ,不能生搬硬套     

对大学生自杀意念影响因素的梳理

目的:探讨大学生自杀意念产生的影响因素,从而为更好地预防大学生自杀事件的发生提供帮助。方法:在维普数据库中,以大学生、自杀意念作为关键词,搜索相关文献,进行文献综述。结果:判断自杀意念的标准不一致,测查自杀意念的时间段存在区别;自杀意念的影响因素包括:抑郁、人格特征、心理健康、应激等;自杀意念相关影响因素的研究欠缺,各因素之间交互作用的探讨等。     

Enhancing query translation with relevance feedback in translingual information retrieval

As an effective technique for improving retrieval effectiveness, relevance feedback (RF) has been widely studied in both monolingual and translingual information retrieval (TLIR). The studies of RF in TLIR have been focused on query expansion (QE), in which queries are reformulated before and/or after they are translated. However, RF in TLIR actually not only can help select better query terms, but also can enhance query translation by adjusting translation probabilities and even resolving some out-of-vocabulary terms. In this paper, we propose a novel relevance feedback method called translation enhancement (TE), which uses the extracted translation relationships from relevant documents to revise the translation probabilities of query terms and to identify extra available translation alternatives so that the translated queries are more tuned to the current search. We studied TE using pseudo-relevance feedback (PRF) and interactive relevance feedback (IRF). Our results show that TE can significantly improve TLIR with both types of relevance feedback methods, and that the improvement is comparable to that of query expansion. More importantly, the effects of translation enhancement and query expansion are complementary. Their integration can produce further improvement, and makes TLIR more robust for a variety of queries.     

A fast and versatile cross-linking strategy via o-phthalaldehyde condensation for mechanically strengthened and functional hydrogels

Fast and catalyst-free cross-linking strategy is of great significance for construction of covalently cross-linked hydrogels. Here, we report the condensation reaction between o-phthalaldehyde (OPA) and N-nucleophiles (primary amine, hydrazide and aminooxy) for hydrogel formation for the first time. When four-arm poly(ethylene glycol) (4aPEG) capped with OPA was mixed with various N-nucleophile-terminated 4aPEG as building blocks, hydrogels were formed with superfast gelation rate, higher mechanical strength and markedly lower critical gelation concentrations, compared to benzaldehyde-based counterparts. Small molecule model reactions indicate the key to these cross-links is the fast formation of heterocycle phthalimidine product or isoindole (bis)hemiaminal intermediates, depending on the N-nucleophiles. The second-order rate constant for the formation of phthalimidine linkage (4.3 M⁻¹ s⁻¹) is over 3000 times and 200 times higher than those for acylhydrazone and oxime formation from benzaldehyde, respectively, and comparable to many cycloaddition click reactions. Based on the versatile OPA chemistry, various hydrogels can be readily prepared from naturally derived polysaccharides, proteins or synthetic polymers without complicated chemical modification. Moreover, biofunctionality is facilely imparted to the hydrogels by introducing amine-bearing peptides via the reaction between OPA and amino group.     

如何提高俄语口语教学

口语是外语教学的重要组成部分.口语不过关,就谈不上全面掌握外语.然而在我国的俄语教学中,口语的应用能力几乎被忽视,这种教学模式培养出来的人才语言应用能力不高,不适应当今社会对俄语复合型人才的要求.而本文主要针对如何提高俄语口语教学提出一些个人见解.     

强化创新思维意识打造科技期刊品牌——《中华创伤骨科杂志》的办刊之路

针对我国科技期刊目前所面临的主要问题,研究和探讨了创新思维意识在打造科技期刊品牌中的作用.通过<中华创伤骨科杂志>8年来打造品牌期刊的举措,说明科技期刊办刊人员的创新思维意识是品牌期刊长盛不衰的动力源泉.