2008—2012年《中华实用儿科临床杂志》载文文献计量分析

目的:分析《中华实用儿科临床杂志》近5年发展情况,为提高该刊质量提供参考依据. 方法:通过"中国生物医学文献数据库"收集该刊2008—2012年的文献题录,采用文献计量学方法,对文献的时间分布、单位分布、作者分布、作者合作情况、单位合作情况、高频关键词、高频主题词等指标进行统计分析. 结果:2008—2012年《中华实用儿科临床杂志》共载文3 459篇,单篇论文的长度在逐年增长;涉及作者13 870位,每篇论文作者平均数量大于4,每篇论文的平均合作单位数量多于1.45,关键词和主题词符合本刊的主题.2008—2010年被引的文献为1 131条,占期间总文献量的62%.结论:2008—2012年发表的论文选择更具有针对性,向着更为合理性的方向发展,研究方法也多采用定量分析方法,并且论文形式多样,文献被引次数越来越多.     

用正交试验法确定最佳调剖施工参数

针对文明寨油田地质特征和开采现状，按照油藏数值模拟原理，以调剖井对应油井的增油降水创经济效益大小为考核指标，运用正交试验的均衡分散性和整齐可比性及Ｌ９（３４），正交表进行调剖最佳施工参数试验．经现场试验、分析、讨论发现：影响调剖效果的主要因素是措施半径，其次为施工排量和注入方式，且最佳施工参数是措施半径在３．５ｍ左右，施工排量在１９ｍ３／ｈ左右，按连续注入方式调剖。经文明察油田、卫城油田、马寨油田５０井次现场试验证明，较好地改善了注水井吸水剖面，对应油井取得了明显的增油降水效果，收到了较好的经济和社会效益．     

关于世行贷款基础教育项目实施效果的调查

世界银行贷款第四个贫困地区基础教育发展项目 ,自 1997年在我国西部贫困地区启动以来 ,取得了实实在在的成效。本文以云南省宣威市“贫四项目”实施效果为对象 ,进行了实事求是的调查与分析     

Locally Periodic Versus Globally Periodic Infinite Words

We call a one-way infinite word w over a finite alphabet (ρ,l)-repetitive if all long enough prefixes of w contain as a suffix a ρth power (or more generally a repetition of order ρ) of a word of length at most l. We show that each (2,4)-repetitive word is ultimately periodic, as well as that there exist continuum many, and hence also nonultimately periodic, (2,5)-repetitive words. Further, we characterize nonultimately periodic (2,5)-repetitive words both structurally and algebraically.     

提前还贷及其隐含期权的分析

可提前还款的定期贷款是隐含着期权的利率衍生物，本文建立CIR利率模型下可提前还款的定期贷款的数学模型，通过离散偏微分方程，建立了模型的计算方法，讨论了随机利率对提前还贷的影响．     

英汉词语文化内涵不对等现象探讨

从英汉词语的歧义、特义及词组合等方面,对英汉语言中词语的文化内涵意义不对等现象进行探讨。     

核磁共振法测定高聚物的结构—核磁共振二维谱

介绍了核磁共振(NMR)波谱,尤其是核磁共振二维谱(2D NMR)在最近几年内的进展。内容包括怎样用NMR测定高聚物的序列分布、共聚物结构、聚合物的混溶性、聚合物液晶的取向度、分子量、短链度和长链支化度、凝聚态高聚物的多相结构等。     

Preparation and Characterization of Nano-ZnFe2O4/TiO2 Films

The nano-ZnFe2O4/TiO2 films possess the functions of desulfurization and degradation for organic pollutants. The sols of ZnFe2O4/TiO2 were prepared by sol-gel method and coated on glass and porous ceramic by vertical coating and dipping-lift processes, respectively, and the samples were obtained after drying and sintering. The composition, appearance, absorption spectrum of the films, and the influence of the film on porous ceramic performances were analyzed using SEM, AFM, UV-Vis spectrometer, and mercury porosimeter, respectively, to determine the operation parameters of the multifunction porous ceramic elements for gas-purification.     

DNA序列中“词”的自重叠性对其分布的影响和异常“词”的鉴别

从语言学的角度来看基因序列,一个ＤＮＡ序列可以看成是由字母Ａ,Ｇ,Ｃ,Ｔ组成的有限的字符串,以一定的语法和词法结构为转录机器所识别．那么,词在序列中是如何分布的？文中研究了在不同状况下的单词的理论分布,证实了单词（即ＣＯＤＥ）的自重叠性对单词在序列中的概率分布的有极大的影响,并就实例验证了这一点．结合经验分布,提出了两种在ＤＮＡ序列中鉴别异常单词的方法．得出结论：字母Ａ,Ｇ,Ｃ,Ｔ等概率出现和不等概率出现是判别单词是否异常的重要条件．     

Can the new ISO Guide 25/EN 45001 create better confidence in laboratory operations?

 Confidence in laboratory operations is discussed based on the ongoing revision of the ISO/IEC Guide 25. Confidence is a subjective attribute, which also depends on whose interest is considered. New and better-defined quality systems and technical elements will be included, and these are beneficial to the transparency of laboratory operations, as well as to the accreditation process. The ultimate aim is, of course, to satisfy customers. The testing laboratories' industrial customers are, however, generally unfamiliar with the ISO/IEC Guide 25 and accreditation. The main reason for improved confidence in testing and calibration laboratories is foreseen to come from closer interaction between laboratories and their customers.