LaFe11.0 Co0.9 Si1.1 B0.2化合物负膨胀研究

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.     

论从屈原到宋玉的四大转型

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.     

海森堡模型中的量子纠缠

量子纠缠是量子信息处理的重要资源,海森堡模型是一种简单的能够在固态系统中实现的模型,研究海森堡模型中的纠缠将极大地推动固态量子计算机的发展。本文简单介绍了海森堡模型,外磁场和Dzyaloshinskii-Moriya（DM）相互作用参量对系统纠缠的影响,以及现阶段的研究进展。此外,文章还进一步提出了在该领域的研究中需要解决的一些问题。     

信息服务的趋同与转型

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。     

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

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.     

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

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.     

交流异步电机状态变量观测及其优化控制

采用维持磁通始终恒定的方法对电机转矩直接控制，可解决交流异步电机控制精度和系统复杂性之间的矛盾，在电机状态变量观测及位置控制中应用了现代控制理论，和传统的矢量控制方法相比，在相同的性能指标下，该系统便于用微机来完成实时控制。     

浅谈石油制品进销存综合管理的实现

本介绍一个石油制品进销存综合管理系统的具体实现方案。该系统包括三个子系统：加油监控子系统、液位遥测监视子系统和业务管理子系统。加油监控子系统完成电脑加油机／付油控制仪的监控；液位遥测监视子系统完成储油罐的液住、界面和温度测量，通过容积表换算成液体容积和质量；业务管理子系统通过对存储的加油数据和储油容积、质量数据进行处理，实现加油站／油库的日常管理功能。     

Classroom Community and Peer Culture in Kindergarten

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.     

锂带卷取的恒张力控制

本文对卷取机恒张力控制的原理进行分析,利用磁粉离合器的激磁电流与转矩成线性关系这一特性,设计了一闭环张力控制系统。