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蒋士强 《福建农林大学学报(哲学社会科学版)》2003,(2)
本文概叙了入世后中国农业面临的农产品品质 安全性及价格的三重冲击和应采取的应对措施 着重分析了农产品安全问题和食品安全保障体系的构建 论述了分析测试技术和科学仪器的七项重任 相似文献
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在被测的368味中药中,各元素的最大值分别是胆矾(Cu)、鹤虱(Fe)、荷叶(Zn)、蜈蚣(Ca)、枳实(Mg)、龟板(P)、阿胶(K)、大青盐(Na)、一枝黄花(Li)、茵陈(Se),最小值分别是菟丝子(Cu)、红豆蔻(Fe)、玄明粉(Mn)、蟾酥(Zn)、玄参(Ca)、五加皮(Mg)、明矾等(P)、磁石、苏木(K)、枇杷叶、当归(Na)、赭石等(Li)、白附子等(Se)。2.2 中药各元素平均含量占11种被测元素均值总和的百分率分别是P36.56、K29.51、Ca20.18、Na8.37、Fe2.61、Zn1.35、Mg0.48、Cu0.38、Mn0.37、Li0.17、Se0.00038。 相似文献
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福建省新型工业化基础评价与比较分析 总被引:6,自引:0,他引:6
我们建立一套能够比较全面地反映一个地区新型工业化基础的评价指标体系,利用2002、2003年的统计数据,运用主成分分析法对包括福建省在内的我国26个省、市、自治区的新型工业化基础进行评价,从信息化程度、工业化程度、科技含量、经济效益、可持续发展等方面将福建省与其他省市进行比较分析,明确福建省的优势与不足,在此基础上提出福建省在推进新型工业化进程中应注意的问题。 相似文献
15.
Task partitioning in new product development teams: A knowledge and learning perspective 总被引:2,自引:0,他引:2
R&D alliances and outsourcing elements of the new product development process are now commonplace practices among many firms. However, little previous work has examined how these organizational choices influence project knowledge and learning. Based on a comparison of three new product development projects in the software industry, this paper examines how task partitioning in the project influences learning and knowledge development within the firm. The paper suggests that internal development projects encourage synthetic learning and development of architectural and tacit knowledge; in contrast, outsourcing and joint ventures encourage analytic learning and development of component and explicit knowledge. 相似文献
16.
《南开管理评论》1998年-2002年引文分析研究 总被引:1,自引:0,他引:1
本文采用引文分析方法对《南开管理评论》1998年-2002年所发表的论文的引文进行了统计分析,从引文量、引文语种、引文类型、引文年代、引文期刊、引文著者等几个方面做了综合评价,其目的是从文献引证的角度来透视该刊的学术水平和期刊质量,并从中寻求一些带有规律性的结论,为期刊的编辑出版提供一些参考。 相似文献
17.
Charles F. Manski 《The American statistician》2019,73(1):296-304
AbstractA central objective of empirical research on treatment response is to inform treatment choice. Unfortunately, researchers commonly use concepts of statistical inference whose foundations are distant from the problem of treatment choice. It has been particularly common to use hypothesis tests to compare treatments. Wald’s development of statistical decision theory provides a coherent frequentist framework for use of sample data on treatment response to make treatment decisions. A body of recent research applies statistical decision theory to characterize uniformly satisfactory treatment choices, in the sense of maximum loss relative to optimal decisions (also known as maximum regret). This article describes the basic ideas and findings, which provide an appealing practical alternative to use of hypothesis tests. For simplicity, the article focuses on medical treatment with evidence from classical randomized clinical trials. The ideas apply generally, encompassing use of observational data and treatment choice in nonmedical contexts. 相似文献
18.
Richard G. Spencer Benjamin D. Cortese Vanessa A. Lukas Nancy Pleshko 《The American statistician》2017,71(1):81-87
In a wide variety of biomedical and clinical research studies, sample statistics from diagnostic marker measurements are presented as a means of distinguishing between two populations, such as with and without disease. Intuitively, a larger difference between the mean values of a marker for the two populations, and a smaller spread of values within each population, should lead to more reliable classification rules based on this marker. We formalize this intuitive notion by deriving practical, new, closed-form expressions for the sensitivity and specificity of three different discriminant tests defined in terms of the sample means and standard deviations of diagnostic marker measurements. The three discriminant tests evaluated are based, respectively, on the Euclidean distance and the Mahalanobis distance between means, and a likelihood ratio analysis. Expressions for the effects of measurement error are also presented. Our final expressions assume that the diagnostic markers follow independent normal distributions for the two populations, although it will be clear that other known distributions may be similarly analyzed. We then discuss applications drawn from the medical literature, although the formalism is clearly not restricted to that application. 相似文献
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《Journal of Statistical Computation and Simulation》2012,82(1):63-75
Self-validated computations using interval analysis produce results with a guaranteed error bound. This article presents methods for self-validated computation of probabilities and percentile points of the bivariate chi-square distribution and a bivariate F distribution. For the computation of critical points (c 1,c 2) in the equation P(Y 1 @ c 1, Y 2 ≤ c 2) = 1 ? α, the case c 1 = c 2 is considered. A combination of interval secant and bisection algorithms is developed for finding enclosures of the percentile points of the distribution. Results are compared to previously published tables. 相似文献