城市可持续发展可拓评价方法

为全面客观、科学合理地评价中国城市的可持续发展能力,并为政府部门制定相关政策提供参考依据,基于可拓理论,以天津市为例,从社会、环境和经济三个方面综合考虑,构建了天津市可持续发展可拓评价的物元模型,并采用简单关联函数确定指标权重,通过计算关联度和等级度,对天津市可持续发展进行了综合评价。结果表明,评价方法可操作性强,评价模型科学合理。     

改进的层次分析法在大学生厌学影响因素分析中的应用

当前,大学生中的厌学现象已非个别,它不仅影响高等教育质量的提高,也影响着学生身心健康的全面发展.文章通过引入层次分析法,计算出大学生厌学原因的指标权重,对影响大学生厌学的因素给予量化,从而为学校管理工作者提供更为精确的数据,准确制定出相应的激励政策和发展规划。     

档案信息质量评价之指标权重分析及运用——基于层次分析法

本文采用层次分析法,以实际调查数据为基础,对于档案信息评价指标分别进行单层和层次间的权重计算和排序,并建立总体评价模型和具体评价步骤,最后结合海西记忆工程进行案例分析。     

The mirror’s curse: Weight perceptions mediate the link between physical activity and life satisfaction among 727,865 teens in 44 countries

Purpose:The present study aimed to examine the link between physical activity(PA)and life satisfaction in a large international study of adolescents.We also aimed to test whether overweight and underweight perceptions act as mediators and whether age and sex acted as moderators.Methods:For this purpose,we analyzed data from the Health Behavior in School-aged Children study,which comprises 727,865 observations from 44 nations at 4 measurement occasions.Results:Multilevel analyses revealed a positive link between PA and life satisfaction.In addition,underweight and overweight perceptions mediated the effect of PA on life satisfaction.We further found that age and sex acted as moderators.In older adolescents,stronger effects were found in the links between PA and life satisfaction,PA and overweight perception,and both weight perceptions and life satisfaction.In addition,in female adolescents,the link between overweight perception and life satisfaction was stronger.Conversely,the links between PA and both weight perceptions were stronger for boys.Conclusion:The results suggest that weight perception explains part of the relationship between PA and life satisfaction in adolescents and that these effects vary as a function of age and sex.     

动作速度定量控制在女子铁饼运动员快速力量训练中的应用研究

以不同的力量素质构成要素为主要依据对完整投掷技术的动作群进行了划分，以选择不同的重量负荷和不同的投掷器械作为力量训练中动作速度控制的主要手段，就动作速度的定量控制对发展女子铁饼运动员的快速力量的效果组织了对照实验。结果表明：由于实验组在不同的动作群实施不同内容的力量训练，且在整个训练过程中对完成练习的动作速度进行有意识的控制，快速力量的训练效果明显优于对照组。     

轻型网络的嵌入式网关软件框架的设计

本文分析了嵌入式Internet的发展趋势,介绍了两种典型的嵌入式网关模型。针对常用的轻型网络,提出了一个整合了内、外网通信的新型嵌入式网关软件框架,论述了各软件模块的工作原理,并对其上的数据流进行了分析。     

关于Carleman不等式的进一步加强

通过估计权系数获得了一个加强的Carleman不等式:     

The dose–response association between V̇O2peak and self-reported physical activity in children

ABSTRACT

Background

Previous research into the association between aerobic fitness and physical activity in children is equivocal. However, previous research has always assumed that such an association was linear. This study sought to characterize the dose–response association between physical activity and aerobic fitness and to assess whether this association is linear or curvilinear and varies by sex, age and weight status.     

The weighted Condorcet fusion in information retrieval

The Condorcet fusion is a distinctive fusion method and was found useful in information retrieval. Two basic requirements for the Condorcet fusion to improve retrieval effectiveness are: (1) all component systems involved should be more or less equally effective; and (2) each information retrieval system should be developed independently and thus each component result is more or less equally different from the others. These two requirements may not be satisfied in many cases, then weighted Condorcet becomes a good option. However, how to assign weights for the weighted Condorcet has not been investigated.     

Head Start and children's nutrition,weight, and health care receipt

Using a sample of low-income children from the Early Childhood Longitudinal Study-Birth Cohort (N ≈ 4350) and propensity-score weighted regressions, we analyzed children's nutrition, weight, and health care receipt at kindergarten entry, comparing (1) Head Start participants and all non-participants, and (2) Head Start participants and children in prekindergarten, other center-based care, other non-parental care, or only parental care. Overall, we found that compared to all non-participants, Head Start participants were more likely to receive dental checkups but showed no differences in getting medical checkups; they were also more likely to have healthy eating patterns but showed no differences in Body Mass Index (BMI), overweight, or obesity. However, these results varied depending on the comparison group—Head Start participants showed lower BMI scores and lower probability of overweight compared to those in other non-parental care, and the effects on healthy eating and dental checkups differed by comparison group.