Mathematical models for academic webs: Linear relationship or non-linear power law?     

Nigel Payne  Mike Thelwall 《Information processing & management》2005,41(6):1495-1510

Previous studies of academic web interlinking have tended to hypothesise that the relationship between the research of a university and links to or from its web site should follow a linear trend, yet the typical distribution of web data, in general, seems to be a non-linear power law. This paper assesses whether a linear trend or a power law is the most appropriate method with which to model the relationship between research and web site size or outlinks. Following linear regression, analysis of the confidence intervals for the logarithmic graphs, and analysis of the outliers, the results suggest that a linear trend is more appropriate than a non-linear power law.  相似文献   

养老保险基金运营的模型和预测   总被引：1，自引：0，他引：1  

叶耀华  郑方贤  左畅  杨玉品 《预测》2001,20(2):65-68

本文综述养老保险基金收入与支出的结构情况，分析其主要影响因素，重点分析人口的年龄结构变化。并基于这些主要因素建立基金余额的数学模型。利用该模型。可以对基金的运营情况进行预测，对基金运营的参数进行敏感性分析。  相似文献   

Antioxidant and lipid lowering activities of Indian black tea     

Ramesh Chander  A. K. Khanna  Kanwal Raj  A. K. Rastogi 《Indian journal of clinical biochemistry : IJCB》2005,20(1):153-159

Indian black tea; CTC leaf and dust, produced by Tata Tea Limited, Kolkata, (India) was studiedin vitro as potential scavenger of oxygen free radicals. Super oxide anions were generated in a system containing xanthine—xanthine oxidase (enzymic system) and by NADH- phenozine methosulphate (non enzymic system). Anions were assayed in terms of uric acid formation and reduction of nitroblue tetrazolium salt, which were shown to be suppressed by tea extracts. Extracts from both leaf and dust also inhibted the formation of hydroxyl radicalsin vitro in the enzymic system comprising hypoxanthine—Cu⁺²—sodium ascorbate and xanthine oxidase and in non enzymic system of deoxyribose—Cu⁺²—sodium ascorbate and H₂O₂ as well as the Cu⁺² induced lipid peroxidation in human low density lipoprotein. Feeding with black tea in normal rats for sixty days increased their antioxidant activity and their liver microsomes were shown to be protected against peroxidation of lipids as stimulated by metal ions with enzymic or non enzymic reactants. Furthermore feeding with tea extracts in normal as well as triton WR—1339 induced hyperlipidemic rats caused decrease in their plasma levels of total cholesterol, phospholipids and triglycerides. The antioxidant and lipid lowering activities of both extracts from CTC leaf and dust tea was comparable and may be due to the presence of natural products like catechin and others.  相似文献   

水貂肠炎病毒疫苗效检指标及实验动物模型研究     

张德礼 《科技通报》1995,11(2):122-125

测定了水貂肠炎病毒无血清细胞培养灭活矿油疫苗和铝胶疫苗免疫接种水貂，豚鼠和家兔的血清ＨＩ和ＳＮ抗体消长规律，证明豚鼠，家兔或水貂接种疫苗后１１－４０ｄ的血清ＨＩ抗体水平是检定ＭＥＶ矿油疫苗或铝胶疫苗对水貂的体液免疫力和免疫保护率的经济，简便和可靠的指标，建立了ＭＥＶ疫苗免疫效力的检定指标及其实验动物模型。  相似文献   

开放式创新视角下二次创新与创新绩效的关系研究     

陈凌云  李夏莲  高照军 《软科学》2016,(7)

从开放式创新视角讨论了二次创新对创新绩效的影响。基于一个两阶段模型,阐述了内向型与外向型、二次创新对创新绩效的作用机制。以高新技术企业为样本进行了分析,结果发现内向型企业更倾向于选择二次创新;二次创新负向调节内向型与创新绩效之间的关系,正向调节外向型与创新绩效之间的关系。  相似文献   

虚拟参考咨询服务模式整合与分析   总被引：1，自引：0，他引：1  

袁红军  卢颖 《现代情报》2006,26(2):133-135

基于多种模式虚拟参考咨询的描述，分析了虚拟参考咨询发展状况，即呈现电子邮件型、实时型及合作型三者并存。并对实际操作中的几个注意事项做了简要讨论。  相似文献   

生态学视角下基于熵权可拓模型的山西省人才聚集预警研究     

陈晓瑜  牛冲槐 《科技管理研究》2016,(6)

基于生态学的理论视角,结合熵权和物元可拓模型的相关理论,以山西省为例,从生态学的角度构建人才聚集预警的指标体系,建立人才聚集预警熵权可拓模型对山西省2006—2013年的人才预警状况进行实证分析,结果表明:山西省人才聚集处于中度预警状态,制度生态因子、社会生态因子、经济生态因子的推动作用促进山西省人才聚集预警度呈现转好的局面,文化生态因子和教育生态因子阻碍了人才聚集的平衡性发展,出现了向低等级转移的趋势。为防止山西人才聚集的非经济现象更加突出提供理论依据,为山西省人才聚集的良性发展提供参考性意见。  相似文献   

商业银行经营业务调整的若干模型     

陈建明  计雷  池宏 《预测》2003,22(4):41-45

经营业务调整是商业银行改善经营结构，应对市场变化的重要手段之一。本文从分析商业银行经营特点以及内在的规律入手，提出了资产负债资金价值分析、经营潜力调整、金融资源分析、业务调整敏感性分析和经营业务调整方案优化等一系列业务调整的模型。综合应用这些模型，为在商业银行进行业务调整时，提供了一套新的定量分析方法。  相似文献   

高校土地置换的模式与政策分析     

彭清平 《科技创业月刊》2007,20(7):79-81

土地置换在高校中的应用盘活了教育存量资源,实现了高校的规模扩张,满足了教育大众化进程的需要。高校土地置换涉及面广、程序复杂、政策性强。结合工作经验,分析了土地置换的模式和政策,提出了土地置换中应处理好的几个问题。  相似文献   

药物高通量亲合色谱筛选中定性定量模型的建立     

刘白玲  李松军 《中国科学院研究生院学报》2006,23(1):31-38

通过对AC高通量筛选过程的分析，建立了AC技术筛选药物的定性及定量模型，为高通量药物筛选提供了必要的理论指导。  相似文献