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本文对铬酸钾指示剂法测定水质中氯化物的作用机理,及在作用终点时与PH值的相互关系进行了综合分析,并对K_2CrO_4的用量和PH值选定提出了作者的见解。同时结合实验找出了最佳实验条件,从而提高了该法测定水质中氯化物的精确度。 相似文献
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云南省教育信息化指标体系建设研究 总被引：2，自引：0，他引：2
云南省是西部欠发达地区,教育信息化建设缺乏完整的指标体系,造成教育信息资源的浪费,影响了教育信息化建设。本文对我省教育信息化指标体系建设进行了研究,初步提出了一套云南省教育信息化指标体系,希望对教育信息化建设有所帮助。 相似文献
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Indicators for complex innovation systems 总被引：3，自引：0，他引：3
J. Sylvan Katz 《Research Policy》2006,35(7):893-909
Performance indicators such as national wealth (GDP per capita), R&D intensity (GERD/GDP) and scientific impact (citations/paper) are used to compare innovation systems. These indicators are derived from the ratio of primary measures such as population, GDP, GERD and papers. Frequently they are used to rank members of an innovation system and to inform decision makers. This is illustrated by the European Research Area S&T indicators scoreboard used to compare the performance of member states.A formal study of complex systems has evolved over the past few decades from common observations made by researchers from many fields. Complex systems are dynamic and many of their properties emerge from the interactions among the entities in them. They also have a propensity to exhibit power law or scaling correlations between primary measures used to characterize them.Katz [Katz, J.S., 2000. Scale independent indicators and research assessment. Science and Public Policy 27, 23-36] showed that scientific impact (citations/paper) scales with the size of the group (papers). In this paper it will be shown that two other common measures, R&D intensity and national wealth, scale with the sizes of European countries and Canadian provinces. Some of these scaling correlations are predictable. These findings illustrate that a performance indicator derived from the ratio of two measures may not be properly normalized for size.This paper argues that innovation systems are complex systems. Hence scaling correlations are expected to exist between the primary measures used to characterize them. These scaling correlations can be used to construct scale-independent (scale-adjusted) indicators and models that are truly normalized for size. Scale-independent indicators can more accurately inform decision makers how groups of different sizes contribute to an innovation system. The ranks of member groups of an innovation system by scale-independent indicators can be subtly and profoundly different than the ranks given by conventional indicators. The differences can result in a shift in perspective about the performance of members of an innovation system that has public policy implications. 相似文献
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ESI排名已成为普遍用以评价高校国际学术水平及影响力的重要评价指标工具之一，主要基于总量指标对高校学科建设提供指导。但ESI学科涵盖范围广泛，总量指标相同的高校其学科内部的发展状况不尽相同，学科评价存在的“唯数量”倾向可能掩盖高校学科发展中存在的关键问题。本文获取20所高校的高被引论文，基于多样性视角构建学科多样性和学科均衡性来衡量其在ESI学科的发展现状，并运用天际线理论深入评价三个典型学科。研究表明，我国高校在不同学科的学科多样性和学科均衡性呈现明显差异，各高校在材料科学的发展上较均衡，在化学上存在差异，在计算机科学上则差异明显。该研究方法有助于发现高校学科发展存在的问题，为学科评价提供新思路，为建设均衡协调的学科生态提供决策支撑。 相似文献
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We combine estimates of the value of patent rights from a survey of patent-holders with a set of indicator variables in order to model the value of patents. Our results suggest that the number of references to the patent literature as well as the citations a patent receives are positively related to its value. References to the non-patent literature are informative about the value of pharmaceutical and chemical patents, but not in other technical fields. Patents which are upheld in opposition and annulment procedures and patents representing large international patent families are particularly valuable. 相似文献
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影响矩作为测度单篇论著影响力的评价指标探讨 总被引：1，自引：1，他引：1
把评价视向由针对学术主体转向针对学术客体,提出着眼于单篇论著影响力评价的影响矩指标。影响矩M被定义为单篇论著影响学者力A及其影响跨度D的乘积,M越大,影响越大。通过对测算样本集和校验样本集的数据分析,显示影响矩M与总被引C及h指数的相关系数都在0.6以上,表明影响矩可以作为测评单篇论著影响力的独立指标。 相似文献
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针对层次分析法(AHP)和变异系数法(CV)的单一赋权方法在高新技术企业竞争力评估中的不足,提出一套综合权重赋值方法称为AHP-CV。首先从广东省科技大数据平台中获取高新技术企业的登记数据集,根据预设维度分类规则分类至预设企业维度,然后基于AHP-CV设计指标权重算法模型计算各企业维度对应的评分值,最后从3个企业维度对不同领域高新技术企业进行归类分析,根据归类结果对高新技术企业的发展状况进行评估,设计能够实时监测高新技术企业综合竞争力的监控系统。实证分析表明此监测算法模型能够很好地对高新技术企业进行监测。基于该监测算法的监控系统已经成功运用于广东省科技大数据平台,将实时对广东省内高新技术企业的综合竞争力进行监测,为各级有关监管部门决策提供参考。 相似文献
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William H. Walters 《The Journal of Academic Librarianship》2017,43(4):305-311
This paper presents five key questions that should be considered by researchers and librarians who develop or use survey-based (stated preference) journal rankings. Many of the distinctions among the various rankings—their attributes, strengths, and weaknesses—are captured in the responses to these five questions: What construct is being measured? How are differences in the construct expressed and recorded? Who are the respondents? Which journals are included in the rankings? How is respondents' familiarity with the journals taken into account? The paper also summarizes the problems that may require attention when survey-based rankings are used. 相似文献