LaFe11.0 Co0.9 Si1.1 B0.2化合物负膨胀研究     

李福安 《宜春师专学报》2014,(6):27-28

利用电弧炉熔炼法制备了LaFe11Co0.9Si1.1B0.2化合物.扫描电镜和能量色散谱仪分析得该化合物主相为NaZn13相,还含有少量的富镧相和富铁相.X-射线衍射仪测量发现,该化合物在居里温度附近的衍射峰随着温度的升高向大角度偏移,分析软件分析并计算得到该化合物在居里温度附近具有明显的负膨胀现象.  相似文献   

论从屈原到宋玉的四大转型   总被引：1，自引：0，他引：1  

吴广平 《职大学报》2005,(1):31-34

宋玉是战国晚期楚国著名的辞赋作家,历来与屈原并尊为"中国文学之祖".但屈原是楚辞的代表作家,而宋玉则是楚赋的代表作家;屈原所创作的楚辞重抒情,而宋玉所创作的楚赋重体物;屈原喜犯颜直谏,宋玉好微辞讽谏;屈原崇高伟大,宋玉自然亲切.从屈原到宋玉,实现了由楚辞向楚赋的转移、由缘情向体物的嬗变、由直谏向曲谏的发展、由崇高向世俗的回落.这些都标志着中国文学的重大转型,对后代作家及其文学创作产生了深远的影响.  相似文献   

某超临界机翼风洞模型转捩方式研究     

魏文建 《科技广场》2012,(4):6-8

本文介绍了风洞试验转捩技术的常规方法和应用,通过对某超临界机翼在风洞试验中自由转捩和固定转捩对阻力的影响结果,结合该机翼的压力分布云图进行了分析,提出了超临界机翼在风洞试验中模拟转捩时的方法。  相似文献   

信息服务的趋同与转型   总被引：2，自引：0，他引：2  

茆意宏 《新世纪图书馆》2010,(2):9-11

随着数字信息技术的普及,信息服务开始向数字化、网络化和综合化转型。信息服务机构之间不再以信息生产、存储和传播技术为边界,而以不同的用户和市场为边界,跨行业竞争与合作,为各自的用户提供多媒体信息服务和综合信息服务。  相似文献   

The role of school leadership in the implementation of the Transition Year Programme in Ireland     

Gerry Jeffers 《School Leadership & Management》2013,33(5):469-486

Introducing an educational innovation into any school context involves some challenge to existing practices. Transition Year is an innovative, optional, one-year programme taken by approximately half the 15–16-year age cohort in schools in the Republic of Ireland. Based on data from an extensive study of TY operating in six different schools, programme co-ordinators and school principals are identified as having key roles in the successful implementation of TY. However, exercising the collegiality both roles demand goes against established cultures of isolated individualism in Irish schools. Furthermore, maintaining TY's coherence and integrity in the face of threats from more established programmes offers particular challenges. For this innovation to be successful, active curriculum leadership by school principals is seen as crucial. The paper interrogates the evidence through the lens of the 2008 OECD study on school leadership and poses questions about the relevance and value of the OECD perspective.  相似文献   

Governance for system optimization and system change: The case of urban waste     

Markus M. Bugge  Arne Martin Fevolden  Antje Klitkou 《Research Policy》2019,48(4):1076-1090

This paper analyses urban waste systems to explore how local authorities can resolve challenges related to climate change, urbanization and resource depletion. The paper investigates how different public governance regimes affect local authorities’ ability to move upwards in the waste hierarchy. It identifies three different governance regimes – traditional bureaucracy, new public management and networked governance – and uses the insights from innovation in urban waste in three Norwegian city regions – Oslo, Drammen and Bergen – to illuminate how these regimes possess both strengths and weaknesses in how they affect system optimization and system change. The observed working practices signal that the issue of urban waste systems is perceived as a challenge of system optimization rather than system change. Viewing this as a challenge requiring system change would probably have ensured a stronger directionality and a broader anchoring of actors. Such an approach is likely to have arrived at a waste prevention mode earlier than the step-by-step-solutions implemented so far. The paper concludes that there is not one best governance regime, but a need to acknowledge their co-existence and carefully consider the characteristics of the respective regimes in order to arrange urban waste systems for long-term dynamic and sustainable city regions.  相似文献   

Classroom Community and Peer Culture in Kindergarten     

Martha Lash 《Early Childhood Education Journal》2008,36(1):33-38

This study reflects a naturalistic, interpretive 5-month study in a public school morning kindergarten regarding the children’s social development and creation of a peer culture during the transitional months into public education. The main focus of the research was the children’s perspectives on these transitions and their evolving classroom community and peer culture in response to the teacher, classroom and school environment. This study captures the dynamic and complex flow of activity that occurs in classrooms, the give and take of relationships, and the agency that children take in developing peer culture as one piece of community. Elements of the peer culture that are foregrounded include secondary adjustments as realized in clean-up strategies, protecting play materials over time, and hypothetical competition with the afternoon kindergarten class.  相似文献   

The transition to secondary school geometry: can there be a “chain of school mathematics”?     

Konstantinos A. Sdrolias  Triandafillos A. Triandafillidis 《Educational Studies in Mathematics》2008,67(2):159-169

Students mainly perceive the transition to secondary school as an opportunity to start their school career anew. Reality often proves them wrong, especially in the case of mathematics. In our paper, we briefly discuss children’s transition to secondary school as both an opportunity and a problem, with reference to the Greek context. In discussions about the transition to secondary school and its effect on the teaching and learning of mathematics, primary and secondary school teachers in Greece often depict school mathematics as a “chain” of concepts and procedures. With this metaphor as our reference point, we discuss how ideologies about the teaching of mathematics are enacted in both school levels. We will base our discussion on the analysis of extracts taken from dialogues in primary and secondary school mathematics classrooms in Greece. In our analysis, we employ a Peircean view of semiotics in an attempt to conceptualize students’ rushed introduction to rigor in justifying mathematical statements in secondary school. These extracts are part of a longitudinal study that aimed, on the one hand, to pinpoint discontinuities and continuities in the teaching of geometry between primary and secondary schools and, on the other, to investigate whether a set of curriculum material that we designed could serve as a link in the teaching of geometry between the two school levels.  相似文献   

Pre-kindergarten teachers’ use of transition practices and children's adjustment to kindergarten     

Jennifer LoCasale-Crouch  Andrew J. MashburnJason T. Downer  Robert C. Pianta 《Early childhood research quarterly》2008

This study describes pre-kindergarten teachers’ use of kindergarten transition practices and examined the extent to which these practices were associated with kindergarten teachers’ judgments of children's social, self-regulatory, and academic skills upon their entry into kindergarten. Participants were 722 children from 214 pre-kindergarten classrooms participating in the National Center for Early Development and Learning's (NCEDL) Multi-State Pre-kindergarten Study. Of nine transition practices intended to promote children's adaptation to kindergarten, pre-kindergarten teachers reported implementing, on average, six transition practices, with notable variation across pre-kindergarten classrooms. Children were judged by their kindergarten teachers to have more positive social competencies and fewer problem behaviors when they attended pre-kindergarten classrooms in which more transition activities were implemented and, specifically, in which teachers discussed curricula or specific children with kindergarten teachers. In addition, positive associations between kindergarten teachers’ perceptions of children's social competence and pre-kindergarten transition activities (total number of activities and activities that children experience directly) were stronger for children who experienced social and economic risks. Implications of these findings related to alignment across the pre-kindergarten to kindergarten settings to improve children's school readiness are discussed.  相似文献   

文化转型期潮乐的生存与发展     

林凤卿 《韩山师范学院学报》2006,27(1):13-15

文化的转型给传统音乐的生存发展带来冲击,处于文化转型期的潮乐,在弘扬地方传统音乐文化的同时,有必要更新观念和强化创新意识,在前人的基础上不断更新发展,只有创作出既具有潮汕传统文化特色、又反映时代精神和抒写大众情怀的精品,潮乐才能获得生存及进一步发展。  相似文献