冬泳者机体应激反应与冷适应能力的实验研究     

徐欣  葛慧 《北京体育大学学报》2007,30(12):1667-1668

对武汉市常年坚持冬泳健康男性30名,用放免测试仪测量冬泳运动中老年男性血清皮质醇、催乳素、甲状腺激素(T3)含量.观察冬泳运动机体应激反应时血清皮质醇、催乳素、血清T3浓度变化,探讨机体的冷适应能力.结果发现:1年、3年及3年以上冬泳者出水后血清皮质醇的浓度明显高于入水前;催乳素无统计学意义.首年冬泳组冬泳出水后高于自身安静状态; 3年以上安静状态血清T3水平高于对照组;3年以上组冬泳出水后血清T3水平与自身安静状态无统计学意义.说明冬泳运动机体应激反应以血清皮质醇的浓度升高为主;1年和3年以上冬泳者应激能力无差别,冬泳者冷习服建立需要一定的时间.  相似文献   

Drama and Reading: Illuminating their Interaction     

Teresa Grainger 《English in Education》1998,32(1):29-37

The intention of this article is to examine the relationship between reading and drama in learning. It is argued that through the study of their interaction and an examination of the parallel processes at work, the potential of drama as a tool for learning about reading is more fully revealed. Their symbiotic relationship is explored with reference to a drama session which highlights some of the cognitive and affective similarities between reading and drama in their common search for meaning. Through this drama the children inhabit, explore and collectively co-author a new text, reading and reflecting upon their own and others' stories in the process.  相似文献   

柑桔产业化的调查与分析——贵州省从江县柑桔产业化调查     

吴晓燕 《黔东南民族职业技术学院学报》2006,(2)

本文通过对从江柑桔生产及其产业化发展情况的调查分析,指出了资金、技术、结构、运行机制、服务体系等亟需解决的问题所在,并在此基础上提出了柑桔产业化进一步发展的对策和建议。  相似文献   

Effects of material properties of cue on impact behaviour in follow and draw shots in billiards     

Shinsuke Shimamura  Kazuhiro Suga  Yositaka Ezawa  Shigeru Aoki 《Sports Engineering》2007,10(4):221-228

The effective numerical method proposed by Shimamuraet al. (2007) is extended to predict the ball motion in a draw shot as well as a follow shot in billiards. The extended method is verified experimentally using a high speed camera. It is observed in the experiment that a ball rotates backwards with a lot of slip (between ball and table) at first and then rotates forwards in a draw shot. Such a ball motion is predicted quantitatively with the numerical method. Numerical simulations are performed to investigate the effects of material properties of a cue on ball behaviour in follow and draw shots and it is found that the impact force increases with increasing stiffness of the shaft in both follow and draw shots, while its duration time is shortened with increasing wave velocity in the shaft for both shots. It is also found that there is a certain shaft stiffness that gives the minimum ball centre velocity, the minimum angular velocity, the minimum slip velocity between ball and table and also the minimum time when the backward rotation changes to a forward one in a draw shot, while the ball centre velocity and the angular velocity increase with increasing shaft stiffness in a follow shot.  相似文献   

Authorware中事件响应交互的应用     

房岚 《苏州市职业大学学报》2004,15(2):67-68

事件交互在一般的多媒体制作中很少用到,本文通过制作Web浏览器来了解ActiveX控件中关于Web浏览器的一些基本事件,熟悉事件响应交互的各项设置,以及它和ActiveX控件之间的应用。  相似文献   

高校学生突发事件与办公室的预防控制能力     

张超西 《孝感职业技术学院学报》2005,8(2):58-60

为了预防和有效地解决高校学生中的突发事件，高校办公室应充分发挥其承上启下、协调左右、联系内外的职能，牵头建立应对学生突发事件的立体防护网，确立事前预案，建立事后档案，并建立应对学生突发事件的动态救护线和善后处理点。  相似文献   

Explaining Variability in Response Style Traits: A Covariate-Adjusted IRTree     

Allison J. Ames  Aaron J. Myers 《Educational and psychological measurement》2021,81(4):756

Contamination of responses due to extreme and midpoint response style can confound the interpretation of scores, threatening the validity of inferences made from survey responses. This study incorporated person-level covariates in the multidimensional item response tree model to explain heterogeneity in response style. We include an empirical example and two simulation studies to support the use and interpretation of the model: parameter recovery using Markov chain Monte Carlo (MCMC) estimation and performance of the model under conditions with and without response styles present. Item intercepts mean bias and root mean square error were small at all sample sizes. Item discrimination mean bias and root mean square error were also small but tended to be smaller when covariates were unrelated to, or had a weak relationship with, the latent traits. Item and regression parameters are estimated with sufficient accuracy when sample sizes are greater than approximately 1,000 and MCMC estimation with the Gibbs sampler is used. The empirical example uses the National Longitudinal Study of Adolescent to Adult Health’s sexual knowledge scale. Meaningful predictors associated with high levels of extreme response latent trait included being non-White, being male, and having high levels of parental support and relationships. Meaningful predictors associated with high levels of the midpoint response latent trait included having low levels of parental support and relationships. Item-level covariates indicate the response style pseudo-items were less easy to endorse for self-oriented items, whereas the trait of interest pseudo-items were easier to endorse for self-oriented items.  相似文献   

信息披露与非理性抢购行为：基于COVID-19疫情分析     

孙振杰 《科研管理》2020,41(6):149-156

本文明晰了2019冠状病毒病疫情期间政府应急信息披露内容的质量对民众非理性抢购行为的影响路径,在理论上探究了政府信息公开的满意度能够产生的抑制效应,引入了交互和中介检验方法分别进行检验。通过对疫情期间民意调查数据的实证研究,得到以下结论：疫情期间政府应急信息披露对民众的信息公开满意度产生了促进作用。此外,政府信息公开满意度在政府应急信息披露内容的质量和民众非理性抢购行为之间不存在中介效应,但存在调节效应,即在政府信息公开满意度与政府应急信息披露内容质量的交互影响下,民众非理性抢购行为得到了显著抑制。  相似文献   

突发疫情下应急治理的紧迫问题及其对策建议          下载免费PDF全文

李维安  张耀伟  孟乾坤 《中国科学院院刊》2020,35(3):235-239

突发疫情是对现代化治理体系和治理能力有效性的一次大检验。面对疫情的考验,能否理顺应对突发重大公共卫生事件启动的政府治理、社会治理和公司治理在内的应急治理体系是应对危机的关键。文章提出应急治理体系顺畅运行应遵循的顶层设计原则、借用原则、分类治理原则、成本分享原则和信息披露原则,并针对性地提出在疫情应对的关键时期应着重补齐的应急治理体系的短板和相应的对策建议,以提升治理体系的有效性。  相似文献   

近五年国际虚拟社区在应急管理中的应用研究热点探析     

秦琴  何晓兰 《情报探索》2020,(4):120-125

[目的/意义]旨在为提高虚拟社区在应急管理中的作用提供参考。[方法/过程]以Web of Science为数据源,通过关键词搜索获取近五年的相关文献,利用VOSviewer进行关键词共现分析,结合内容分析对国际上虚拟社区在应急管理中的应用研究热点内容进行梳理,并进行总结和展望。[结果/结论]该主题领域的研究具有较强的学科综合性,虚拟社区内容挖掘技术与方法的研究、危机信息交流行为、融合了虚拟社区的系统理论框架构建与系统平台开发研究是目前学者关注的重点。  相似文献