短道速滑个人项目体力分配策略研究          下载免费PDF全文

袁国庆  李文敏  黄佳儒  杨扬  郭立涛  朱永博 《体育科研》2019,(3):2-7

目的：探析短道速滑个人项目两届冬奥会及冬奥会与世锦赛体力分配策略规律差异。方法：收集整理索契、平昌冬奥会，以及2014—2017年世锦赛短道速滑个人项目相关数据，分析单圈用时、肯德尔相关系数。结果：（1）冬奥会各单项单圈用时不同程度地少于世锦赛，平昌不同程度地少于索契；（2）除2016世锦赛500 m，其他赛事均全程具有显著相关（P＜0.05）；（3）除索契冬奥会女子1 000 m，其他赛事均较早出现显著相关（P＜0.05），平昌冬奥会男子与女子均在第7、8圈为高相关（r≥0.70）；（4）平昌冬奥会1 500 m男子第12、13圈，女子第13圈为高相关（r≥0.70），两者均从第9圈开始出现显著相关（P＜0.05）。结论：500 m出发位置尤为重要，高速滑行中稳固站位能力需求突出，冬奥会中对全程维持速度能力的要求逐步提高；冬奥会1 000 m与1 500 m比赛争夺有利位置战术的实施位置较以往更为靠后。  相似文献   

大面积建成区建筑密度遥感制图产品的精度验证     

王帅  覃驭楚  杨富坤 《中国科学院大学学报》2020,37(1):83-92

大面积建成区建筑密度遥感制图产品能够提供土地开发强度与人类居住环境的基础信息，是支撑人居环境研究和土地利用规划的重要数据。全球人类居住区层（global human settlement layer，GHSL）是由欧盟联合研究中心负责的大面积人居环境制图项目，建成区建筑密度遥感制图产品是GHSL重要的组成部分。目前该产品在欧美地区已经完成了GHSL建成区建筑密度遥感制图产品的验证。然而以中国为代表的东亚区域的建筑物形态和城市布局与欧美等区域有较大的差别，有必要在亚洲地区对其进一步验证。以中国的5个典型城市（上海、西安、长春、昆明和乌鲁木齐）大面积单体建筑物分布图为基础，通过聚合分析和邻域关键点搜寻匹配等算法，生成中国建成区建筑密度栅格图像产品作为验证数据，然后通过回归分析等方法，在像元尺度上对GHSL建成区遥感制图产品进行评价验证。结果显示，GHSL建成区建筑密度产品在较低分辨率下可以反映中国地区建筑密度情况，但在较高分辨率下在高值区过高估计密度。本研究可以为中国地区研发建成区建筑面积密度产品提供依据。  相似文献   

基于无人机激光点云的树障检测与砍伐树木数量估算     

张苏  齐立忠  韩文军  朱笑笑  习晓环  王成  王濮  聂胜 《中国科学院大学学报》2020,37(6):760-766

电力走廊的树木生长会对输电线路的安全运营造成巨大影响，精确检测出影响线路安全的树木并将其砍伐至关重要。因此，提出一种基于无人机激光点云的树障检测与砍伐树木数量估算方法。首先，对激光点云进行快速自动化处理，先后精确提取地面点、电力线点与植被点；其次，基于电力线点进行分段，并分析电力线与植被点的安全距离，进而确定树障区域的位置和范围；最后，对树障区域植被点云进行单木分割，并统计单木数量，最终实现砍伐树木数量的精准估算。研究结果表明，无人机激光点云可以实现输电通道树障的有效检测与砍伐树木数量的精确估算，总体树木砍伐数量估算精度可达92.3%，可为输电线路安全运营提供遥感技术支撑，也可为电网运维单位制订树木砍伐计划提供可靠依据。  相似文献   

人的全面发展与全面发展的教育     

黎进深 《安顺学院学报》2003,(4)

人的全面发展是马克思主义教育学的根本原理之一。教育的全面发展不等于人的全面发展,人的全面发展要依赖于教育的全面发展。实施教育创新,构建新的课程体系是现代科技条件下教育全面发展的指标,亦是人全面发展的内涵。  相似文献   

Engagement in dialogue: tracing our connections or speaking across the space between?     

Leslie Maurice Alford 《Educational Philosophy and Theory》2018,50(5):448-454

Abstract

In this paper I contrast conceptions of self from two perspectives: an individualistic orientation and a communitarian approach. In doing so, the philosophical justification is Wittgenstein’s idea that individualism is produced and reinforced as a way of being, thinking and interacting in community. With this contextual frame, I argue that we are shaped by the language practices of our community to ascribe meaning and interpret our own relationships with others through our language lexicon and grammar. To illustrate the communitarian perspective I refer to Māori perspectives in which connectedness is axiomatic: in particular the concepts of whanaungatanga and whakapapa, as described by Ka’ai and Metge. On the basis that such concepts are predicated on language use, I suggest that we can learn the grammar of engagement in a discursive context that emphasises connectedness just as easily as in one which is founded on separateness. I argue that interacting with an other is to engage with the ideas, beliefs, and values that shape their language, even as we expose our own. Engaging between individualistic and communitarian understandings is presented as learning to bridge language gaps between different social constructs and understandings of reality.  相似文献   

Individual participant data meta-analysis of the impact of educational interventions on pupils eligible for Free School Meals     

Bilal Ashraf  Akansha Singh  Germaine Uwimpuhwe  Steven Higgins  Adetayo Kasim 《British Educational Research Journal》2021,47(6):1675-1699

Meta-analysis is the synthesis of findings from research projects, which enables an estimate of the average or pooled effect across various studies. This study presents findings from the intention to treat analysis for a series of educational evaluations in England using a two-stage meta-analysis with standardised outcome data and individual participant data meta-analyses. The research estimates the overall impact of educational trials on pupils eligible for Free School Meals (FSM) and the attainment gap in literacy and mathematics performance between FSM and non-FSM pupils based on analysis of 88 trials and data from over half a million pupils. For the meta-analyses, frequentist and Bayesian multilevel models were used to estimate the individual and pooled effect size across categories of explanatory variables such as age groups (key stages in England) and aspects of the type of interventions (one-to-one, small group, whole class). Results indicated that the overall impact of interventions on the literacy outcomes of FSM pupils was positive, with a pooled effect size of 0.06 (0.03, 0.08). However, for mathematics, no overall effect on FSM pupils was observed. Analysis of the attainment gap indicated that literacy outcomes for FSM pupils were improved by interventions marginally more than for non-FSM pupils (pooled attainment gap 0.01 (−0.01, 0.04)). The risk of bias assessment showed that estimates were consistent across different methodological approaches. Overall, evidence from this study can be used to identify, test and scale educational interventions in schools to improve educational outcomes for disadvantaged pupils.  相似文献   

社会不确定事件下个体理性、群体理性与制度演化——基于认知经济学的视角     

邬美红  罗贵明 《宜春学院学报》2021,(1)

在社会不确定性事件下,经典经济学的完全理性受到了来自认知科学的挑战。认知经济学的发展冲破了完全理性的局限,提出在社会不确定事件下,存在着个体的有限理性和群体的有限理性,强调要正确认识个体理性和学习、群体理性和制度演化的关系。认知经济学在本体论上属于个人主义,在认识论上属于实证主义,与经典经济学处于完全不同的路径。  相似文献   

数字图书馆个性化信息推荐系统研究   总被引：25，自引：2，他引：25  

高凤荣  马文峰  王珊 《情报理论与实践》2003,26(4):359-362

In order to provide individual information service in digital library, it's necessary to develop a personal-ized recommender system. Based on information retrieval, information filtering and coUaborative filtering technologies, this article gives some examples of the recommender system and analyzes their key technologies.  相似文献   

个体间非正式知识转移研究述评   总被引：1，自引：0，他引：1  

谢荷锋  水常青 《研究与发展管理》2006,18(4):54-61

个体间非正式知识转移是企业知识管理的关键环节之一,从非正式知识转移的特征出发,归纳了非正式知识转移的三个研究议题,梳理了三种基本研究视角,为国内本问题的研究提供借鉴。  相似文献   

我国网络科技期刊开放访问现状及利用对策浅析     

王宝英  马爱芳 《现代情报》2006,26(11):128-130

“开放访问”是近年采兴起的学术出版方式和学术成果无障碍交流模式，受其影响我国一些科技期刊也通过网络向用户提供免费全文的开放访问服务，表现为学科分布不均衡、服务方式和文件格式多样化及质量较高等特征。图书情报界和个人用户应积极采取应对策略，以促使我国科技期刊开放访问学术资源的充分利用。  相似文献