分类检索语言的断言与非断言性--从标引中的两个实例谈起

知识的微分化和科学概念内涵的衍化只是扯外部提供了一些发展空间，分类法的断言性完全可以将它们消化在近缘的类和不同的种中。因此，断言惟为分类法提供了一个稳定的状态，使分类法能在一个时期内发挥分类检索的作用。分类法中，一个个类目组成一个个集合住标引时先于文献而抽象地存在着。每当新元素添加进集合中，这个集合都要被修正。此时，这些元素将不再处于合适的类目内，而且必须移动它们。显然分类法还存在着非断言性，分类法的发展动力来自分类法自身的非断言性。     

探析自动索引原理

文章试图对自动索引的方法作一些探讨。首先介绍了自动索引的五种理论模型和六种自动标引方法，随后探讨了自动索引中不可或缺的两个对象——全文索引和数据库索引的原理。     

基于印刷与电子索引工具的文献双检策略——以“高师学生心理素质研究”项目为例

双检策略,是指同时采用印刷本和电子数据库两种索引工具来完成同一课题文献检索的方法。其做法是根据课题内容要求,选择合适的检索工具,分别采用其纸印本和光盘或网络版,进行文献检索,并对其结果进行分析、选择。双检策略不仅能保证文献查询全面、准确,而且能保证质量,利于科研。参考文献6。     

数字环境下图书馆信息服务质量的评价

本文对影响用户满意度的因素、图书馆信息服务质量评价原则以及几种有代表性的评价模式进行研究探讨，并尝试创建了一套公共图书馆信息服务质量评价指标体系。     

Inverted Index Compression Using Word-Aligned Binary Codes

We examine index representation techniques for document-based inverted files, and present a mechanism for compressing them using word-aligned binary codes. The new approach allows extremely fast decoding of inverted lists during query processing, while providing compression rates better than other high-throughput representations. Results are given for several large text collections in support of these claims, both for compression effectiveness and query efficiency.     

饱和链烷烃沸点的拓扑研究

本文从距离矩阵和邻接矩阵出发,结合矩阵的数学知识,提出了一种新的拓扑指数Qx=(W×V)1/8,用最小二乘法拟合b.p.(℃),得到线性回归方程为:b.p.(℃)=-277.814+165.248Qx(r=0.993)     

Esports players,got muscle? Competitive video game players’ physical activity,body fat,bone mineral content,and muscle mass in comparison to matched controls

BackgroundEsports players, like traditional athletes, practice for long hours and, thus, are vulnerable to the negative health effects of prolonged sitting. There is a lack of research on the physical activity and the health ramifications of prolonged sitting by competitive players. The purpose of this study was to investigate activity levels, body mass index (BMI), and body composition in collegiate esports players as compared to age-matched controls.MethodsTwenty-four male collegiate esports players and non-esports players between 18 and 25 years of age signed a written consent to participate. Physical activity was examined using daily activity (step count) with a wrist-worn activity tracker. A questionnaire assessing physical activity was also administered. Secondary outcomes included body-fat percentage, lean-body mass, BMI, and bone mineral content measured using dual X-ray absorptiometry.ResultsThe step count in the esports players was significantly lower than the age-matched controls (6040.2 ± 3028.6 vs. 12843.8 ± 5661.1; p = 0.004). Esports players exhibited greater body-fat percentage (p = 0.05), less lean body mass (p = 0.003), and less bone mineral content (p = 0.03), despite no difference in BMI between the esports and non-esports players.ConclusionAs compared to non-esports players, collegiate esports players were significantly less active and had a higher body-fat percentage, with lower lean body mass and bone mineral content. The BMIs showed no difference between the 2 groups. Esports athletes displayed significantly less activity and poor body composition, which are all correlated with potential health issues and risk of injury. BMI did not capture this difference and should not be considered as an accurate measure of health in competitive esports players.     

武汉市经济社会发展多目标预警体系研究

研究了武汉市经济社会发展预警系统的基本理论,设计出武汉市经济社会发展的预警系统结构,建立了预警指标体系和预警模型,应用层次分析法和系统模糊决策法,通过专家调查分析,得到了各指标的重要性权数,为武汉市经济社会发展预警管理提供了科学的方法。     

基于RITE测度的降维方法研究

在RITE的框架下,考察了社会信息化指标体系中不同指标的增长特征及其在测算中的表现,提出了一种基于RITE测度的降维方法——指标增长特征降维法的实现思路。文章结合案例,通过指标抽取试验,对所提出的方法进行了实证研究。     

中国工业基尼系数与产业集聚程度分析

主要是研究中国工业的基尼系数与产业集聚程度。文中的分析表明中国的制造业集聚呈上升态势,这说明中国产业分布的空间集中程度在提高,集聚和地方专业化呈增长趋势。中国工业区域化的决定因素则告诉我们,自然要素资源的依赖在一定程度上促进了中国制造业的集聚,运输成本、市场规模仍然是决定行业区域分布的重要因素。