3—6岁幼儿家庭户外活动现状及优化对策——以青岛市城阳区为例     

初瑞瑶  栾晓辉 《林区教学》2021,(3)

幼儿天生就爱在户外玩耍,户外活动不仅能促进幼儿身体的健康发育,而且能够有效促进幼儿社会性以及智力的发展,家庭户外活动更能促进亲子间的感情。通过文献法、问卷调查法、访谈法对幼儿家庭户外活动进行六方面的调查,包括幼儿家庭户外活动的时间、场所、内容、伙伴、家长参与情况以及家长态度。研究发现,幼儿家庭户外活动存在家长对幼儿户外活动认识不足、幼儿户外活动场地和内容局限单一以及存在诸多安全隐患等问题。建议家长应合理规划,增加幼儿户外活动的多样性和趣味性;注重参与,优化幼儿户外活动的体验与成效;多重保障,提升幼儿户外活动的安全性。  相似文献   

6+1教学法在高等数学教学中的研究     

王孝梅 《科教导刊》2021,(1):105-106

针对部分学生认为学习高等数学枯燥乏味,甚至产生厌烦、逃避的情况,提出6+1高等数学教学法.6+1高等数学教学法改变了传统高等数学教学中"教师讲、学生听"的教学模式,且与"学生为主体,教师为主导"的现代教学理念相吻合.通过"导""议""展""评""理""研""思"七环节,激发学生学习高等数学兴趣,培养学生的自主学习意识,提高学生的高等数学逻辑思维和探究能力.  相似文献   

硼镧共渗对Ti-6Al-4V钛合金空蚀性能的影响          下载免费PDF全文

李海斌张晓波石林爽张曼婷 《福建工程学院学报》2021,(4):360-364

采用固体渗剂包埋渗法对Ti-6Al-4V钛合金进行硼-稀土共渗处理,并利用超声振动空蚀机研究分析试样在去离子水中的空蚀性能。结果表明,硼-稀土共渗在Ti-6Al-4V合金表面获得均匀致密的表面渗层。表面渗层具有很高的显微硬度,与基体冶金结合,其主要由TiB2、TiB化合物层和B原子固溶于α-Ti的扩散层构成。稀土元素La的添加,提高渗硼效率,使试样表面渗层厚度增加,显微硬度显著提高,材料的抗空蚀性能得到显著改善。  相似文献   

技术发展与业务需求双驱动下的物联网演进     

彭聪  罗德安  夏林中  许志良 《深圳信息职业技术学院学报》2021,(1)

伴随着信息与通信领域的关键技术以及产业背景下新型业务需求的发展,物联网的关注重点、关键支撑技术以及服务形式都在持续地变化。自20世纪90年代末物联网概念被提出至今,物联网的代际演进可以系统地梳理为具有不同特征的三个阶段,包括注重物体标记的初代物联网、注重物体联网的二代物联网以及引入了社交网络的新型社交物联网。为了构建完整的物联网系统,应深刻地理解技术发展和产业需求是如何驱动物联网的代际演进,并在此基础上,谋求关键技术的选用和协同,以提供适应物联网设备和应用特征的解决方案。  相似文献   

罗丹明6G与金纳米微粒相互作用的光谱特征     

杨卓  刘绍璞 《洛阳师范学院学报》2006,25(5):63-66

研究了罗丹明6G与金纳米微粒相互作用的RRS光谱、荧光光谱和吸收光谱的特征,发现:当体系中存在过量的罗丹明6G染料时,金纳米微粒在一定的浓度范围内分别与体系的RRS强度、荧光强度、吸光度成正比,且灵敏度高,其检出限达到纳克级.由此,可以建立RRS法、荧光猝灭法、吸收光度法来测定溶液中的金纳米微粒.  相似文献   

Teachers’ perceptions of assessments of their mathematical knowledge in a professional development course     

Michelle T. Chamberlin  Jeff D. Farmer  Jodie D. Novak 《Journal of Mathematics Teacher Education》2008,11(6):435-457

The purpose of the project reported in this article was to evaluate how assessing teachers’ mathematical knowledge within a professional development course impacted from the teachers’ perspective their learning and their experience with the course. The professional development course consisted of a 2-week summer institute and the content focus was geometry. We had decided to assess the mathematical learning of the teachers during this professional development course for various accountability reasons, but were concerned about possible negative by-products of this decision on the teachers and their participation. Thus, we worked to design assessment in ways that we hoped would minimize negative impacts and maintain a supportive learning environment. In addition, we undertook this evaluation to examine the impacts of the assessment, which included homework, quizzes, various projects, and an examination for program evaluation. Seventeen grade 5–9 teachers enrolled in the course participated in the study by completing written reflections and by describing their experiences in interviews. We learned that while our original intent was “to do no harm,” the teachers reported that their learning was enhanced by the assessment. The article concludes by describing the various properties of the assessments that the teachers identified as contributing to their learning of the geometry content, many of which align with current recommendations for assessing and evaluating grade K-16 mathematics students.

Michelle T. ChamberlinEmail:

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Cloning and characterization of a glucose 6-phosphate/phosphate translocator from Oryza sativa     

姜华武  佃蔚敏  刘非燕  吴平 《Journal of Zhejiang University. Science. B》2003,(3)

INTRODUCTIONNongreenplastidsofheterotrophictissuesarecarbohydrate importingorganellesand ,inthecaseofamyloplastsofstoragetissues,thesiteofstarchsynthesis.Investigationofwholetissuesfromavarietyofstarchsynthesizingcropplantsindicatedthathexoseunitswereimpo…  相似文献   

六阶常微分方程的特征值的上界估计   总被引：2，自引：0，他引：2  

黄振明 《江苏广播电视大学学报》2005,16(3):68-70,73

考虑六阶常微分方程的特征值的上界估计，利用分部积分、Rayleigh定理和不等式估计等方法，获得了用前n个特征值来估计第n 1个特征值的上界的不等式，其估计系数与区间的几何度量无关，其结果在物理学和力学等领域中应用广泛。  相似文献   

The happy-fish-little-pond effect on enjoyment: Generalizability across multiple domains and countries     

《Learning and Instruction》2023

Academic enjoyment is an important educational construct given that it benefits students' engagement, persistence, wellbeing, and mental health. In this study, we examine two factors that determine this crucial emotion, namely student- and class-level achievement. Past research has been restricted to single-country or single-domain examinations of secondary school students, limiting generalizability of findings. To bridge this gap, we utilize the Trends in International Mathematics and Science Study and the Progress in International Reading Literacy Study (TIMSS-PIRLS) combined 2011 data (N = 180,084 4th-grade students, 37 countries). Our results provide robust evidence that student-level achievement positively predicts enjoyment in math, science, and reading, while the effects of class-level achievement are negative—the Happy-Fish-Little-Pond Effect. These results showed relative universality across the domains and countries examined.  相似文献   

吡啶-2,6-二甲酸配合物的研究进展     

银秀菊 《河池学院学报》2002,(2)

吡啶 - 2 ,6 -二甲酸是生物体内具有生物活性的性质 ,它的配合物、衍生物得到了广泛的研究和应用。本文在对大量的文献进行分析、研究、总结的基础上 ,对吡啶 - 2 ,6 -二甲酸合物的合成、谱学研究及热稳定性、晶体结构进行了简要综述。  相似文献