R410A制冷剂在家用空调上的运用分析

分析了R4lOA制冷剂在空调中应用的必要性,并与R22制冷剂在性能上比较,得出R410A空调系统在配管材料和专用工具的特点,及R410A空调系统在制冷剂充注上必须以液体充注,为进一步提高系统效果,室内机、室外机在结构上进行改进的几大实用技术要点。     

超标准数学的兴起

本文从数理逻辑、数系扩张、理想元素、超有限集覆盖法、模拟客观世界乃至教学原则等方面简论超标准(非标准)数学的重要意义.本文旨在说明超标准分析在理论上是别开生面的课题,实用上是独辟蹊径的研究.     

图书馆原理论略——从阮冈纳赞五定律及戈曼新五定律说起

阮冈纳赞五定律中的 1- 4定律具有较强的指导意义和永恒的生命力 ,但也有其局限性 ;其第 5定律 ,对图书馆是生长着的有机体没有作出实质性揭示。戈曼 (Gorman ,M .)提出的图书馆学新五定律 ,具有新意 ,但对阮氏五定律并不具有发展、创新意义。阮氏五定律及戈氏新五定律都不是图书馆学定律 ,而是图书馆工作定律。图书馆发展原理包括图书馆工作与图书馆事业的主要方面 ,可归纳为 5个原理 :与经济发展、技术进步相适应原理 ;符合国情原理 ;以读者为中心原理 ;可持续发展原理 ;以办馆效益为目标原理。参考文献 6。     

一种从医学文本中实现自动关键词抽取和筛选的技术方法*

鉴于重要关键词对于文本有着重要的强文本表示功能,关键词抽取和筛选在信息检索、信息抽取和知识挖掘等领域中有着重要的作用。在调研当前关键词抽取的方法后,结合医学领域已有的叙词表和工具以及BM25F加权词频公式提出基于医学文本的重要关键词抽取和筛选的技术方法。该方法主要解决两个关键问题：关键词的识别和抽取、关键词重要性的衡量和筛选。以2001-2007年骨关节炎领域的文献集合为数据来源,对该技术方法进行实践尝试,并验证其实际有效性,为知识挖掘中的重要关键词抽取提供一个行之有效的途径。     

Generalized Linear Mixed-Effects Modeling Programs in R for Binary Outcomes

We review, examine the performance, and discuss the relative strengths and weaknesses of various R functions for the estimation of generalized linear mixed-effects models (GLMMs) for binary outcomes. The R functions reviewed include glmer in the package lme4, hglm2 in the package hglm, MCMCglmm in the package MCMCglmm, and inla in the package INLA. We illustrate the use of these functions through an empirical example and provide sample code.     

Programming Plus Subject Expertise: A Combined Approach for Approval Profile Modification

This article focused on the analysis of four years of circulation data from print monographs acquired through an approval plan and firm ordering and incorporated interlibrary loan data to compare purchases with demand. A group of subject areas, including communication, psychology, and engineering were selected as examples for in-depth analysis. Using R programming, the authors automated an analysis to identify areas needing attention. The results from the analysis, together with librarians' subject expertise, enabled librarians to adjust monograph purchases accordingly.     

Innovation and strategy: Does it make a difference! A linear study of micro & SMEs

Innovation is known to be used by some businesses to help them differentiate their trading position within a specific locale. Research has also proven that by adopting a strategy, aims can be achieved and turnover increased. This study will endeavour to use these two key areas to evaluate how, they are used and to what extent they can improve business performance. The study was carried using 145 Micro and SME business, located within the rural county of Lincolnshire. The businesses were taken from specific locations on a random basis which included rural, remote rural and urban settings. Initial findings found that businesses situated within remote areas performed better than those within the other test areas, leading to the conclusion that they use innovation as a strategy to outperform their business rivals.     

一种评估中国科技期刊国际差距的方法 —— 以海洋湖沼学科期刊为例

为了客观而清晰地衡量Chinese Journal of Oceanology and Limnology(CJOL)的国际显示度,找出与国际期刊的定量差距,作者选取了具有代表性的20种国内外海洋与湖沼学科期刊,利用Web of Science(R)(WoS)工具,并设计了一些指标,例如回访率、复引率和机构自引率等,对这些期刊的被引情况进行了比较,表明这些科技期刊在引用者、地域、机构、源期刊和主体学科方面所处的位置,从而更具体地描述了它们的国际显示度,同时指出了CJOL与国际水平的差距.根据这些数据或指标,这些期刊可以明显地分为4个不同水平的方阵.     

基于R／S法分析中国股票市场的非线性特征

本文使用月收益率数据，应用R／S分析法研究中国证券市场的非线性。实证结果表明中国证券市场是一个非线性市场，存在状态持续性和逆状态持续性，波动呈现群集性；使用月收益率数据比日收益率数据能更好地描述证券市场的非线性特征。