Delayed Time-to-Degree and Post-college Earnings     

Witteveen  Dirk  Attewell  Paul 《Research in higher education》2021,62(2):230-257

Research in Higher Education - Increasingly, undergraduates take more than 4 years to complete a baccalaureate, a situation widely perceived as a waste of time and money, for students,...  相似文献   

新冠肺炎疫情下专业图书馆科研新媒体服务探究——以中国科学院文献情报中心“中国科讯”为例     

李楠  张超  路璐  邹沐宏 《图书情报工作》2020,64(15):151-156

[目的/意义] 以中国科学院文献情报中心"中国科讯"为例，分析专业图书馆应急科学传播服务的举措及成效，为应急事件下专业图书馆科学传播服务提供借鉴。[方法/过程] 梳理新冠肺炎疫情期间"中国科讯"微信公众号推送的服务内容，从日均用户增长和阅读量分析用户对不同类型内容的关注程度，提出应急科学传播服务的思考。[结果/结论] 疫情期间，"中国科讯"日均用户增长明显，电子资源保障类内容阅读量最高，其次为新冠病毒科技攻关进展相关内容、科普类直播和信息素养教育直播观看人数达到数万人。应急事件下，专业图书馆应加强特色服务的宣传、加强信息甄选和审核机制，重大公共卫生事件下应急科学传播工作预案缺失也需引起重视。  相似文献   

体育团队自信心的影响因素及其调控方法     

南海艳 《山东体育科技》2004,26(3):49-50

体育团队自信心是影响体育团队成绩的重要因素。本文分析了影响体育团队自信心的因素及调控体育团队自信心的方法，试图为从事体育团队的工作者提供科学的参考依据。  相似文献   

直面惨淡的人生——刘恒解读   总被引：3，自引：0，他引：3  

薛南 《扬州教育学院学报》2004,22(1):8-10,18

刘恒的创作缺乏快乐,他看到的是生命的困惑,致力于探究生存之道,探索人性之谜,揭示无所不在的人生宿命。存在与消亡,实有与虚无,意义与空无,成为他永恒的话题。  相似文献   

中国篮球竞技后备人才现状调查与培养对策   总被引：26，自引：4，他引：22  

于振峰  张振东  张建军  李南  张娟  韦内灵  黎晓萍  房淑珍  王梅珍  高瞻 《体育学刊》2002,9(5):123-126

篮球后备人才梯队建设是我国竞技篮球赶超世界先进水平的捷径。在通过对我国篮球竞技后备人才的体能状况、基本技术等进行调查分析的基础上，在培养体制、体能训练及基本技术等方面提出我国篮球竞技后备人才培养的对策。  相似文献   

The relationship between peak height velocity and physical performance in youth soccer players   总被引：1，自引：1，他引：0  

Philippaerts RM  Vaeyens R  Janssens M  Van Renterghem B  Matthys D  Craen R  Bourgois J  Vrijens J  Beunen G  Malina RM 《Journal of sports sciences》2006,24(3):221-230

Longitudinal changes in height, weight and physical performance were studied in 33 Flemish male youth soccer players from the Ghent Youth Soccer Project. The players' ages at the start of the study ranged from 10.4 to 13.7 years, with a mean age of 12.2 +/- 0.7 years. Longitudinal changes were studied over a 5 year period. Peak height velocity and peak weight velocity were determined using non-smoothed polynomials. The estimations of peak height velocity, peak weight velocity and age at peak height velocity were 9.7 +/- 1.5 cm x year-1, 8.4 +/- 3.0 kg x year-1 and 13.8 +/- 0.8 years, respectively. Peak weight velocity occurred, on average, at the same age as peak height velocity. Balance, speed of limb movement, trunk strength, upper-body muscular endurance, explosive strength, running speed and agility, cardiorespiratory endurance and anaerobic capacity showed peak development at peak height velocity. A plateau in the velocity curves was observed after peak height velocity for upper-body muscular endurance, explosive strength and running speed. Flexibility exhibited peak development during the tear after peak height velocity. Trainers and coaches should be aware of the individual characteristics of the adolescent growth spurt and the training load should also be individualized at this time.  相似文献   

The energetics and benefit of an arm swing in submaximal and maximal vertical jump performance     

Lees A  Vanrenterghem J  De Clercq D 《Journal of sports sciences》2006,24(1):51-57

The aims of this study were to investigate the energy build-up and dissipation mechanisms associated with using an arm swing in submaximal and maximal vertical jumping and to establish the energy benefit of this arm swing. Twenty adult males were asked to perform a series of submaximal and maximal vertical jumps while using an arm swing. Force, motion and electromyographic data were recorded during each performance and used to compute a range of kinematic and kinetic variables, including ankle, knee, hip, shoulder and elbow joint powers and work done. It was found that the energy benefit of using an arm swing appears to be closely related to the maximum kinetic energy of the arms during their downswing, and increases as jump height increases. As jump height increases, energy in the arms is built up by a greater range of motion at the shoulder and greater effort of the shoulder and elbow muscles but, as jump height approaches maximum, these sources are supplemented by energy supplied by the trunk due to its earlier extension in the movement. The kinetic energy developed by the arms is used to increase their potential energy at take-off but also to store and return energy from the lower limbs and to "pull" on the rest of the body. These latter two mechanisms become more important as jump height increases with the pull being the more important of the two. We conclude that an arm swing contributes to jump performance in submaximal as well as maximal jumping but the energy generation and dissipation sources change as performance approaches maximum.  相似文献   

打造新时代高质量科普服务体系核心阵地——《现代科技馆体系发展“十四五”规划(2021—2025年)》的编制与思考          下载免费PDF全文

马宇罡  赵洋  苑楠  莫小丹  刘玉花  刘琦 《自然科学博物馆研究》2022,(1):25-30

结合参与《现代科技馆体系发展“十四五”规划(2021—2025年)》研究编制工作的思考和体会,尝试对现代科技馆体系发展这一新蓝图从整体上予以解读,剖析其制定的时代背景和思考起点,梳理科技馆体系存在的问题,并以“重新定义科技馆体系”给出问题的对策,提出五个方面的重点任务及相应保障措施,阐述了《规划》的特点和关键,以期为有效贯彻落实《规划》提供借鉴。  相似文献   

图书馆多媒体视听阅览室管理系统的设计与实现     

蒋南 《大学图书情报学刊》2006,24(6):34-36

文章结合南京师范大学图书馆实际,阐述了图书馆多媒体视听阅览室碟片查询、收费系统的开发设计过程.  相似文献   

试论21世纪高校图书馆员英语素质的提高     

张楠彭妍  于冬梅 《当代图书馆》2006,(4):66-68

进入21世纪以采，随着时代的变化和网络技术的飞速发展，英语素质时于高校图书馆员而吉显得越来越重要，甚至在某种程度上决定了其服务水平的高低。但是从目前高校图书馆员队伍的现状来看，其整体英语素质偏低已经成为不客忽视的重要问题。在这种情况下，认识提高英语素质的必要性，并找到切实有效的方法，对高校图书馆员进行英语教育势在必行。  相似文献