A quasi-experimental study of a peer-assisted strategy-based reading intervention in elementary school     

《Contemporary educational psychology》2023

Promising methods of reading instruction for elementary school students incorporate peer-assisted learning routines and reading strategies. In addition, models of reading comprehension point to the importance of various determinants of reading competence such as reading fluency and vocabulary knowledge. Multicomponent reading intervention programs need to be evaluated to determine IF and HOW they unfold their effects on the reading competence of elementary school students on the basis of such theoretical and empirical models. Accordingly, the present study was designed as a quasi-experimental study of a 20-lesson peer-assisted and strategy-based multicomponent intervention for whole-class instruction in elementary school. Linear mixed models and latent growth models were used to analyze the longitudinal data (pre-, post- and follow-up test) on the reading competencies (reading fluency, vocabulary knowledge, reading strategy competence, reading comprehension) and intrinsic reading motivation of students in the intervention (N = 187) and control group (N = 177). The results showed an interaction between the groups and the change in reading comprehension, indicating a significantly increased score in the intervention group at the posttest (d = 0.15) but not at the follow-up test (d = 0.12). The results of the latent growth model point to the importance of designing interventions that explicitly integrate reading strategies, reading fluency and vocabulary knowledge and also foster intrinsic reading motivation. In addition, reading fluency was revealed to be the strongest predictor of reading comprehension and the change in fluency over time was closely linked to reading comprehension development.  相似文献   

碲锌镉晶体生长技术的研究进展     

张 娟刘俊成  刘安法贾彩云 《科技广场》2014,(1):6-9

碲锌镉单晶体是近年发展起来的一种性能优异的三元化合物晶体材料,具有良好的光电性质,被广泛用于制作核辐射探测器、红外探测器外延衬底等而引起了越来越多的研究者重视。研究碲锌镉晶体生长方法,对于低成本制备大体积、高质量的碲锌镉单晶体具有重要意义。数值模拟的发展,加深了对各种生长碲锌镉单晶体技术的认识,对加大碲锌镉单晶生长及应用的研究具有重要的意义。  相似文献   

四川省地震灾区婴幼儿营养监测状况分析     

李晓杰 《科学中国人》2014,(8):92-95

作者通过对四川省青川县和彭州市两个地震灾区6-24个月龄婴幼儿健康状况的统计分析,发现该地区生长发育状况不佳,存在营养不良现象,其中贫血率较高。经过对比进行营养包6个月干预后的人群统计分析,发现营养状况稍得到改善,其中彭州市目标人群贫血改善明显,由此提出面对四川其它或其它类似贫困地震地区,由于贫困,天灾必然加剧受灾人群的营养状况,特别是贫血率状况,针对这些地区的求援,必须紧迫加强营养包的干预,而且需要持续性的干预,比较可靠的预算应该在灾难期6个月以上方有一定的作用,同时必要的管理措施有利于保证营养干预对象的稳定性,提高营养干预的有效性的。  相似文献   

变频电机基于状态维护的研究与探讨     

贺振国  刘增伦  苗霖 《中国科技纵横》2014,(17):61-62

讨论了电机温度日常管理与维护,对电机温度进行了统计,绘制了趋势图,使用统计方法验证了环境温度变化对电机温度的影响关系,预测了维护时间,提出了维护策略,对于减少电机温度过高造成的事故风险有较大帮助。  相似文献   

经济政策不确定性对中国碳排放的对称与非对称影响     

刘妍  赵晶  李晨 《资源科学》2022,44(6):1091-1104

在全球经济快速转型背景下,经济政策不确定性（EPU）的影响已渗入到生产生活的各个领域,正确认识经济政策不确定性带来的环境风险对“双碳目标”实现至关重要。本文基于非对称传导效应视角,采用2003—2017年中国30个省份面板数据,实证检验EPU在长短期对碳排放的对称与非对称影响,并基于经济发展水平展开异质性分析,构建中介效应模型分析EPU上升、下降对碳排放影响的作用机制。研究表明：①EPU对碳排放短期存在非对称影响,长期存在对称影响。在短期,EPU上升显著影响碳排放,而EPU下降对碳排放影响不明显。在长期,两者呈负相关的线性关系,EPU下降促进碳排放。②EPU对碳排放的影响因经济发展水平不同而具有明显区域异质性。在短期,EPU变化对东部地区作用不显著,对中、西部地区作用显著,并表现出非对称影响;在长期,东部地区仅有EPU下降会增加碳排放,中、西部地区EPU与碳排放呈现负相关的线性关系。③碳排放在不同区域受到EPU冲击后的调整速度不同,东部地区的自我调节能力高于中、西部地区,能更迅速地调整并稳定碳排放水平。④EPU对碳排放的影响主要通过经济效应表现,EPU上升通过抑制经济增长活力导致碳排放降低,EPU下降通过加快经济增长速度导致碳排放增加。未来,政府应审慎调整经济政策,健全和完善市场信息披露体系并充分发挥地区比较优势助推新兴产业发展。  相似文献   

基于数控加工应用的非圆曲线方程     

王小全 《科教文汇》2014,(15):36-37

在数控加工中经常有由一些复杂曲线构成的非圆曲线（如椭圆、抛物线、双曲线、正余弦曲线以及拟合曲线等）工件,在各级的数控技能大赛中也有应用。本文介绍基于数控车/数控铣和加工中心应用的非圆曲线方程的各种形式。  相似文献   

环境因子对银杏香菇生长的影响     

王治军  畅凌冰  魏素玲  梁臣 《环球赛鸽科技》2014,(35)

本文通过对银杏香菇在不同温度、相对空气湿度、光照环境因子变化试验,结果是：银杏香菇在20~25益时,菌丝体及子实体生长最好;空气相对湿度在70~75%时,菌丝体生长快,分布均匀。子实体生长阶段,空气相对湿度为85~90%最适宜;光照遮光度在80%时菇体厚实,菌盖圆整。  相似文献   

Mannheim曲线的性质     

董大伦 《台州学院学报》1999,(6)

给出Mannheim曲线及其伴随曲线的若干条性质.  相似文献   

Biodeterioration of Incralac used for the protection of bronze monuments   总被引：2，自引：0，他引：2  

Christopher J. McNamara  Margaret Breuker  Marie Helms  Thomas D. Perry  Ralph Mitchell   《Journal of Cultural Heritage》2004,5(4):361-364

Outdoor bronze sculptures are highly susceptible to corrosion in many environments and organic coatings are widely used for their protection. The purpose of this study was to determine the susceptibility of the commonly used coating Incralac to biodeterioration by microorganisms. A yeast was isolated from a bronze statue treated with Incralac and its ability to degrade Incralac was determined using growth curves, scanning electron microscopy (SEM), and electrochemical impedance spectroscopy (EIS). The organism grew slowly on Incralac in liquid culture, but SEM images demonstrated its ability to adhere to Incralac coated metal. Additionally, the yeast caused a rapid drop in the low frequency impedance of Incralac coated metal that was not observed under sterile conditions, indicating that the organism accelerated deterioration of the coating. The potential for microbial growth to accelerate deterioration of Incralac should be considered when developing a maintenance strategy for the protection of outdoor metal monuments.  相似文献   

利用第二种间断点对球团矿还原曲线进行缺陷分析     

王振新  应海松  陈颖娜  杨东彪 《大众科技》2016,(5)

利用第二种间断点对设备故障进行检测已经在机电领域有一定的应用,当机电设施存在一定的故障,其产生的信号也存在突变。文章借助MATLAB软件,用小波变换滤波技术,将球团矿还原检测产生的还原曲线的噪声进行分离,将分离后的高频信号进行分析,可以了解在还原试验过程中,是否有突发因素造成曲线异常等缺陷,达到准确完成球团矿还原性试验的要求。  相似文献