体育教学中教师反馈频率对学生目标定向的影响

将目标定向理论应用于体育教学,以素质教育的体育教学思想为指导,采用实验的方法,以三所普通高等院校选修摩登舞为体育课程的学生作为实验对象,研究不同反馈干预频率对学生目标定向的影响,分析得出比起低频率的反馈干预,高频率的反馈干预能够使运动达到更好的效果。     

有关多媒体技术在跆拳道教学中应用的研究

跆拳道运动的教学模式多年来一直是以教师亲身示范、讲解,学生随之学练为主。随着这项运动普及率和运动水平的不断提高,单一的教学模式在某种程度上限制了教学的效果和范围。文章旨在研究和探索一种新的方法和思路来指导跆拳道教学,以达到优化教学内容,提高教学效率的目的。文章从视频反馈教学,CAI课件辅助教学和连拍图片分解技术动作教学三个方面分析多媒体在跆拳道教学中的应用。     

部队装备管理信息化建设的动态反馈复杂性分析

部队装备管理信息化建设是一个由诸多要素相互作用、相互依赖相结合而成的具有特定功能的有机动态反馈复杂系统.为分清其内部的复杂动态反馈结构,提高建设质量,在对其进行系统分析的基础上,利用系统动力学流率基本入树建模法构建了整个建设系统的反馈结构模型,并利用极小基模生成集法对模型中的反馈环进行了基模分析.通过对反馈基模的分析,提出了相应的管理策略,以期为部队装备管理信息化建设提供有效的理论指导.     

中学体育与健康学生学业评价的实施分析

传统的学业评价虽然能在一定程度上体现学生学习情况,但不能做到因人而异,不能做到全面的、综合的体现一个学生的学业学习水平及态度,也不能体现一个学生的技能发展及体能增长,也不能做到评价结果与教学反馈之间的有效关联。我们这几年来通过自身的课题研究及引入先进地区的评价体系,逐渐形成了具有特色的能够基本全面反映学生真实学业能力的评价体系,并且很大程度提高了学生的对自我及他人的评价能力。     

Teacher feedback,disciplinary climate,student self-concept,and reading achievement:A multilevel moderated mediation model

Research has confirmed the importance of teacher feedback on student learning. The mechanism of how they are related, however, is not clear enough. In this study, we explored this relation with 60,501 fifteen-year-old students from collectivistic and individualistic cultures in PISA 2018. Importantly, we examined the possible mediating role of reading self-concept and the moderating role of disciplinary climate at both student level and school level in multi-level structural equation models (MSEM). Results demonstrated that the association between teacher feedback and reading achievement was significantly mediated via reading self-concept at student level across cultures, and this indirect effect was significant irrespective of the disciplinary climate level. Moreover, results showed that a positive disciplinary climate would facilitate the building of students’ reading self-concept which subsequently would enhance their reading achievement at school level. This study has important theoretical, practical, cross-cultural, and methodological implications for teacher feedback research and student learning.     

一维混自旋钻石链磁性质理论推导

用相关有效场理论研究并推导出一维混自旋钻石链Ising系统磁学性质式。     

基于最佳反馈系数的恒流型测温调试电路的设计

针对恒流型铂电阻测温电路传统调试方法过程繁杂,并且由于调试过程中的非量化操作具有的不确定性而导致误差大的缺陷,依据最佳反馈系数对应电路最优状态的关系,设计了相应的调试电路,简化了调试过程,提高了调试精度.实验表明,该方法简明实用,准确度高于传统调试方法 .     

Streptomycin inhibits electrophysiological changes induced by stretching of chronically infarcted rat hearts

Objective

To investigate stretch-induced electrophysiological changes in chronically infarcted hearts and the effect of streptomycin (SM) on these changes in vivo.

Methods

Sixty Wistar rats were divided randomly into four groups: a control group (n=15), an SM group (n=15), a myocardial infarction (MI) group (n=15), and an MI+SM group (n=15). Chronic MI was obtained by ligating the left anterior descending branch (LAD) of rat hearts for eight weeks. The in vivo blockade of stretch-activated ion channels (SACs) was achieved by intramuscular injection of SM (180 mg/(kg·d)) for seven days after operation. The hearts were stretched for 5 s by occlusion of the aortic arch. Suction electrodes were placed on the anterior wall of left ventricle to record the monophasic action potential (MAP). The effect of stretching was examined by assessing the 90% monophasic action potential duration (MAPD₉₀), premature ventricular beats (PVBs), and ventricular tachycardia (VT).

Results

The MAPD₉₀ decreased during stretching in both the control (from (50.27±5.61) ms to (46.27±4.51) ms, P<0.05) and MI groups (from (65.47±6.38) ms to (57.47±5.76 ms), P<0.01). SM inhibited the decrease in MAPD₉₀ during inflation ((46.27±4.51) ms vs. (49.53±3.52) ms, P<0.05 in normal hearts; (57.47±5.76) ms vs. (61.87±5.33) ms, P<0.05 in MI hearts). The occurrence of PVBs and VT in the MI group increased compared with that in the control group (PVB: 7.93±1.66 vs. 1.80±0.86, P<0.01; VT: 7 vs. 1, P<0.05). SM decreased the occurrence of PVBs in both normal and MI hearts (0.93±0.59 vs. 1.80±0.86 in normal hearts, P<0.05; 5.40±1.18 vs. 7.93±1.66 in MI hearts, P<0.01).

Conclusions

Stretch-induced MAPD₉₀ changes and arrhythmias were observed in chronically infarcted myocardium. The use of SM in vivo decreased the incidence of PVBs but not of VT. This suggests that SACs may be involved in mechanoelectric feedback (MEF), but that there might be other mechanisms involved in causing VT in chronic MI.     

录像反馈在排球普修教学中的应用与研究

本文通过在排球教学中引入控制论中的反馈原理,利用摄录系统将学生的动作进行录像,然后进行观看分析,针对动作状态提出改进方案,再次练习、录像,再次分析,循环往复。结果证明,运用录像反馈分析与评价检验学生的动作技术,有利于加速学生的动作技术的掌握和提高,同时也激发了学生的学习兴趣,活跃了课堂气氛,全面地提高了教学效果。     

追加反馈对背越式跳高学习效果影响的实验研究

采用实验法,探讨不同频率的追加反馈对运动技能学习效果的影响。结果显示,在运动技能的学习过程中,给予学习者追加反馈有助于学习效果的提高。但是过高频率的追加反馈会减少学习者自身的内部反馈,给运动技能学习效果带来负效应。只有建立一个科学、合理的反馈频率区间值,明确最佳指导运动技能学习的追加反馈频率,才能使运动技能的学习得到最优化控制。