TIJAH: Embracing IR Methods in XML Databases

This paper discusses our participation in INEX (the Initiative for the Evaluation of XML Retrieval) using the TIJAH XML-IR system. TIJAHs system design follows a standard layered database architecture, carefully separating the conceptual, logical and physical levels. At the conceptual level, we classify the INEX XPath-based query expressions into three different query patterns. For each pattern, we present its mapping into a query execution strategy. The logical layer exploits score region algebra (SRA) as the basis for query processing. We discuss the region operators used to select and manipulate XML document components. The logical algebra expressions are mapped into efficient relational algebra expressions over a physical representation of the XML document collection using the pre-post numbering scheme. The paper concludes with an analysis of experiments performed with the INEX test collection.     

Relationships between exercise regulations and motivational consequences in university students

The aim of this study was to examine propositions stemming from Self-Determination Theory (SDT) that contend motivational consequences vary as a function of different regulations in the exercise domain. Participants (N = 276; n = 98 men; n = 178 women) completed inventories assessing exercise regulations, current exercise behavior, and behavioral intentions to continue exercising for the next 4 months and the effort and importance associated with exercise participation. Bivariate analyses indicated autonomous exercise regulations (identified and intrinsic) were the strongest correlates of each motivational consequence across both sexes, and introjected regulation was positively associated with exercise consequences in women. Simultaneous multiple regression analyses indicated that exercise regulations accounted for a sizeable portion of the variance across each motivational consequence in both sexes (R2adj values ranged from .20 to .53). Both regression and structure coefficients revealed that introjected regulation was a stronger motivational force in women than men, and identified regulation was the most important predictor of all three motivational consequences in both sexes. Collectively, these findings suggest that exercise regulations differentially predict motivational consequences across sexes, and future research using this theoretical framework for examining motivational issues pertinent to the exercise domain appears warranted.     

液体补充:美国运动医学会的见解

关键点:1.最近的科学研究强调,在进行体力活动前、中、后保持机体良好的水合状态对生理功能和运动能力具有有益作用。2.保持正常水合状态需要对运动员在整个训练日改善饮水行为作出具体努力。3.体力活动中,自愿饮水量受饮料的口味、组成成分,以及饮料使用是否方便的影响。在为运动员设计补液方案时,必须考虑这些因素。4.运动中补液量应能完全补充汗液丢失的量。其生理效益和对运动能力的有效作用已有很好的证明。5.运动后迅速完全的补液需要摄入氯化钠以补充汗液中丢失的钠盐,补液量要大于汗液丢失量。中图分类号:G804.5　文献标识码:03　…