The use of significance limits in graphical data representations

Summary Significance limits are proposed as an alternative to the use of standard deviation, standard error, or confidence or tolerance limits when experimental data are presented in a graphical form. This measurement of uncertainty allows graphical t-tests to be used both for the estimation of data variance and for an approximate statistical comparison between two or more data sets.     

高速铁路路堤传递地基差异沉降特性及控制限值研究

为研究高速铁路地基差异沉降在路堤中的传递扩散特性,运用有限元方法,分析了路基在小变形条件下地基差异沉降与路基面不均匀变形的映射关系,并在得到土工离心模型试验校正的基础上,讨论了地基差异沉降模式、路堤高度等因素对路基面不均匀变形的影响规律.研究表明:地基差异沉降在路堤中的扩散程度随地基差异沉降渐变段长度与路堤高度比值的增大而减小,比值大于3~5以后,地基差异沉降与路基面不均匀变形具有良好的一致性;路基面不均匀变形与地基差异沉降呈正相关性,并随路堤高度、地基差异沉降渐变段长度的增加而减小;基于路基面不均匀变形限值提出了地基差异沉降控制标准,丰富了高速铁路路基沉降变形控制技术指标体系.     

International equity flows and the predictability of US stock returns

We examined the link between international equity flows and US stock returns. Based on the results of tests of in‐sample and out‐of‐sample predictability of stock returns, we found evidence of a strong positive (negative) link between international equity flows and contemporaneous (one‐month‐ahead) stock returns. Our results also indicate that an investor, in real time, could have used information on the link between international equity flows and one‐month‐ahead stock returns to improve the performance of simple trading rules. Copyright © 2007 John Wiley & Sons, Ltd.     

Pharyngeal cavity and the gills are the target organ for the repellent action of pardaxin in shark

Summary Pardaxin, an active principle of the repellent secretion of the Red Sea flatfish,Pardachirus marmoratus, elicited severe struggling, mouth paralysis, and transient increase in urea leakage from the gills only when administered to the medium bathing the shark's pharyngeal cavity and gills. An apparatus was constructed which prevents a mixing of the outflow from shark's gills with water bathing its surface skin. It is concluded that in sharks the gills and/or the pharyngeal cavity are the target organ for the repellent action of pardaxin.     

Making the abstract concrete: The role of norms and values in experimental modeling

Experimental modeling is the construction of theoretical models hand in hand with experimental activity. As explained in Section 1, experimental modeling starts with claims about phenomena that use abstract concepts, concepts whose conditions of realization are not yet specified; and it ends with a concrete model of the phenomenon, a model that can be tested against data. This paper argues that this process from abstract concepts to concrete models involves judgments of relevance, which are irreducibly normative. In Section 2, we show, on the basis of several case studies, how these judgments contribute to the determination of the conditions of realization of the abstract concepts and, at the same time, of the quantities that characterize the phenomenon under study. Then, in Section 3, we compare this view on modeling with other approaches that also have acknowledged the role of relevance judgments in science. To conclude, in Section 4, we discuss the possibility of a plurality of relevance judgments and introduce a distinction between locally and generally relevant factors.     

中国纳米科技现状分析与思考

纳米科技因其技术含量高、涉及范围广而引起各国的重视。我国在纳米科技的研发中投入了大量的人力、物力,但由于在科技改革体制中还存在一些问题,以及人们对纳米科技理解的片面性,影响了纳米科技的发展。为了实现纳米科技的可持续发展,我们对中国纳米科技的现状进行了分析与思考。     

基于小波的钦州水稻产量多时间尺度分析与预测

利用小波诊断技术对广西钦州1950～2005年水稻产量和播种面积进行了多时间尺度分析,并利用基于小波的ARIMA模型进行了预测。分析结果表明：56年来,钦州水稻总产量和单位产量波动具有明显的3a、7a和25a特征时间尺度,播种面积7a特征时间尺度主要受农村土地制度改革影响。基于小波的ARIMA模型在水稻产量、播种面积预测方面精度很高,预测误差与气象灾害和土地政策变化有关。利用基于小波的水稻产量多时间尺度分析与预测方法,可以辅助水稻产量增减周期的分析以及对未来趋势的判断,对于结合供求关系合理调整种植面积,促进农业可持续发展提供帮助。     

化学发光技术在蛋白质和DNA分析中的新进展

化学发光技术在生物技术、分子生物学、药学、临床和环境等许多领域都获得了广泛的应用，有关化学发光的评论文章近年来也有许多报道。本文就化学发光技术在蛋白质和DNA分析中的较有特色的新进展(2000年以来)进行了评述，引用文献30篇。     

2007年SSCI收录香港特区论文的统计分析

在关注自然科学的同时也应该关注社会科学,本文通过对香港特区1289篇论文,运用计量学的方法,从学科、机构、发表期刊、被引用次数等多个角度,详细分析香港特区社会科学论文的现状,本文还对所涉及的3793名作者,结合TDA分析软件对其论文合著情况做进一步分析。     

马铃薯不同基因型直链淀粉含量比较分析

分离提取了126个马铃薯品种(系)基因型的块茎内源淀粉，用Hovenkamp-Hermelink J．H．M的方法测定了其直链淀粉含量，用ANOVA比较分析了块茎成熟期基因型和品种基因型的直链淀粉含量，其基本结论是品种基因型间直链淀粉含量存在极显著差异，而成熟期基因型间直链淀粉含量不存在差异，该结论为淀粉品质改良提供基本依据和数据。