各种反馈对非英语专业大学生写作的影响

结合国内外对二语写作反馈的研究,实验证明,教师反馈、同伴反馈和自我反馈对非英语专业大学生写作有较大影响,各种反馈形式各有优缺点,可为教师如何有效采用反馈方式改善大学生写作状况提供参考.     

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.     

控制论视角下党组发挥领导作用的内在逻辑与运行机制

领导是党组的核心功能和制度主线,党组理论研究应当关注党组如何发挥领导作用。控制论中的系统调节、控制反馈、信息传递等观点对理解党组领导过程具有理论适切性。从系统控制的运作机制与基本流程来看,党组发挥领导作用对党组在处理党政关系、获得信息反馈、采取调节方式和控制决策过程等重要方面提出了要求,并通过党组管理机关基层党组织机制、党组调研和党务信息公开机制、党组重大事项请示报告机制、党组议事决策机制等关键机制贯彻落实。针对当前党组运行过程中存在的"重业务、轻党建"、决策程序不规范等问题,充分发挥党组领导作用应从规范党委领导内容与方式、注重党组组织建设、重视信息反馈、完善决策方式等方面着手。     

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。     

计算机机房视频监控系统建设

计算机机房承担着教学和试验等功能。随着信息技术和视频设备的发展,计算机机房的管理也应该从单一的点式管理发展到网络化、信息化的集约管理上来。我们应当建立由视频终端、传输、控制、显示、记录登记5大部分组成的计算机机房视频实时监控系统,以有效提高机房管理的质量和效率。     

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。     

从“赠书回馈”活动实践论高校图书馆教育职能的实现简

高校图书馆图书捐赠的目的不应局限于丰富馆藏。实践证明,赠书回馈活动能彰显资源共享和低碳环保理念,提高学生的资源利用能力,培养学生积极的心理体验,对增强校友感情有一定的促进作用。赠书回馈是新时代条件下高校图书馆实现其教育职能的有效方式。     

教育测评和学习领域的人工智能技术评估

随着人工智能技术的快速发展,人工智能技术在教育中的应用越来越广泛,很多科技公司投入资金开发人工智能技术应用于教育测评和学习领域,但是这些技术和产品的质量良莠不齐,用户很难辨别,这种情况在某种程度上不利于教育人工智能产业的发展。为帮助用户评估人工智能技术应用于教育测评和学习领域的产品质量,提出自动生成考题或学习材料、自适应学习、自动评分和自动反馈4项技术的评估方法,从决策者和用户的角度对如何评估教育人工智能技术给出建议。