基于极限尺寸窜动的零件假废品判别

对零件产生假废品的原因进行分析,提出了基于极限尺寸窜动的假废品判别方法,并指出了零件假废品出现的区域、零件假废品区域同基准不重合误差的关系。     

搜寻理论模型与网络搜寻行为探析

本文从信息经济学的角度,从消费者搜寻模型、市场价格离散、消费者预期、搜寻成本等四个方面,针对消费者在购买商品时所进行的搜寻行为进行理论总结,并对该理论在网络搜寻行为等问题上的应用进行初步地探讨。     

Relationship between the size of pontocerebellar angle tumor and audiology

Objective: To study the relationship between the size of pontocerebellar angle tumor and audiology. Methods: Retrospective analysis of accoustically evoked brainstem response (ABR) waveforms and pure tone threshold in 27 subjects with tumor of pontocerebellar angle. Results: ABR wave forms and pure tone threshold were significantly affected statistically by the size of tumors, especially those tumor larger than 3 cm in diameter. Conclusion: The primary symptom of the patient was unilateral hearing loss. Early discovery of the lesion is important and ABR is a sensitive tool for early diagnose of the tumor.     

Group size and organisational conditions for children’s learning in preschool: a teacher perspective

Background:?There is a limited amount of research about group size in preschool, and how it impacts on teachers’ working conditions and their ability to support children’s learning and knowledge development in line with curriculum intentions.

Purpose:?From a perspective on quality, this article examines the organisational conditions for children’s learning in preschool in relation to group size. The questions at issue are: how do teachers explain how they organise the child group and the learning environment in preschool, and why?

Sample:?The sample consists of 12 preschools from different parts of Sweden. The preschools selected for the study are stratified in order to represent small and large group sizes in Swedish preschools as defined by the Swedish National Agency for Education. The sample contains both urban and rural regions and represents districts that differ geographically, demographically, ethnically, and which include varied socioeconomic structures. The 12 preschools had children in three age groupings: 1–3, 3–5 or 1–5. The number of children in the participating preschools ranged from 12 children to 45 children, with seven of the preschools having more than 30 children in their groups.

Design and method:?The article is based on interactionist perspectives, Bronfenbrenner’s ecological systems theory, a critical ecology of the early childhood profession, theories of children’s learning, and four dimensions of pedagogical quality. Together, these theoretical perspectives contribute to an understanding of the relationships between policy issues, educational goals, group size and teachers’ competence in organising and creating conditions for children’s learning. Semi-structured interviews were conducted with two teachers from each of the 12 preschools. The interviews lasted between 40–60 minutes and were recorded and transcribed verbatim. The analytical process was conducted in three steps and can be described as an analytical process of abduction. The four dimensions of pedagogical quality were used as analytical lenses to discern and understand critical aspects related to the teachers’ understanding of group size.

Result: Irrespective of group size, most of the children participate in different group constellations throughout the day, some organised by the teachers and some by the children themselves. Teachers’ competence to organise the children in such ways that good conditions for learning were created, differed between preschools, and depended on the teachers’ approach, which can be described as either intentional or unintentional learning.

Conclusion: Teachers’ organisational approaches influence the quality of the preschool and conditions for children’s learning in distinct ways.     

彰显地方办学特色 提高师范办学优势

近年来,作为一个在中小型城市发展的地方性师范院校,特色办学的优势越来越明显。把建设地方性、多科性、开放性新型师范院校作为我校发展的战略目标,既可以不断提高人才质量的培养,优化学科、专业队伍结构的建设,推进教育教学改革和人才培养模式,实现学校核心竞争力、综合实力和社会影响力的同步提升,又能扬长避短,在激烈的搏弈中探索到发展与前进的动力和方向。     

自动缫生丝与立缫生丝性能比较分析

对23 dtex(20/22D)自动缫生丝和立缫生丝的内在质量进行了专项实验和比较分析,结果表明:自动缫生丝的纤度偏差、断裂强度、抱合优于立缫丝.而均匀Ⅱ度变化、断裂伸长率、强伸度的离散性差于立缫丝.还探讨了缫丝张力对生丝拉伸性能的影响,并建立了生丝抱合与生丝结构参数间的定量关系.     

晶粒尺寸对16 Mn 钢 MnS 夹杂物的应力应变分布影响

基于ABAQUS有限元分析方法,对两种热处理工艺下的16 Mn钢中MnS夹杂物在同一拉伸载荷作用下的应力和应变分布进行了研究。结果表明,两种晶粒尺寸的材料在长条形MnS夹杂物附近存在着垂直于加载方向的X形状的Mi-ses应力和PEEQ集中区。但细晶的16Mn钢中MnS引起的应力和应变集中程度要明显大于粗晶的16Mn钢中MnS引起的应力和应变集中,其原因与细晶强化有关。