从Bergman空间到Dirichlet空间的广义Cesàro算子

对α,β〉-1,0〈p,q〈∞和Cn中单位球上的全纯函数g,刻画了Bergman空间到Dirichlet空间的广义Cesàro算子Tg的有界性和紧性。此外,还讨论了Tg的本性模。     

生产者责任延伸制度研究

生产者责任延伸(EPR)制度是关于废弃物管理的重要制度之一,它将生产者的产品责任延伸到产品生命周期后的废物处理阶段,这对于促进循环经济的实现、保障个人和公众环境权益具有十分重要的意义。环境管理理念的转变是建立生产者责任延伸制度的前提,产品生命周期理论是建立生产者责任延伸制度的基础。我国《循环经济促进法》明确规定了生产者责任延伸制度,但还存在诸多疏漏,所以,应借鉴国外立法经验,明确实施主体和责任分担,建立监督机制,健全诉讼制度,尽快使我国的生产者责任延伸制度走向完善。     

Mysteries in the Night: An Exploratory Study of Student Use and Perceptions of 24/5 Hours

The Oregon State University Valley Library has been open 24 hours per day, five days per week, during regular academic terms since 2010. The authors collected survey data during 2012 to explore how students used the hours and whether they perceived that the provision of 24/5 hours contributes to their academic success. Nearly 90% of the respondents believed that their use of the overnight hours made a difference in their performance. The demographic, usage, and perception of value data collected provide a useful snapshot of overnight usage in this exploratory study.     

Old Problem for New Reasons

Summary

Evening staff members of the Research and Information Services Department (RISD) at the North Carolina State University (NCSU) Libraries have recently noticed an apparent increase in the use of the library by people perceived to be mentally ill. RISD staff members have found themselves in some ways unpreparedtorespond comfortably to this change. This paper, a case study, proposes reasons for this increased visibility of mentally ill people, and describes the challenges the staff members faced and how they overcame them. The RISD staff members acquired the knowledge and confidence they need to work with mentally ill people through communication among colleagues, review of the literature, and staff training.     

添加约束的EKF-SLAM算法

为了得到较高的估计精度,基于扩展卡尔曼滤波的同时定位与地图生成算法(EKF-SLAM)需要完成多次路径闭合.这不仅消耗大量的时间与能量,而且增大了机器人发生故障的概率.本文提出一种添加约束的EKF-SLAM算法.该算法通过分析协方差矩阵确定目标路标对,用测量信息与全局先验方向对原估计结果进行约束,能够极大改善估计效果,兼顾高效率与高精度.实验结果及其分析充分表明了算法的有效性.     

在调和映射空间上的Dressing作用

得到Dressing作用的一些性质,证明标准的nuniton扩张解在Dressing作用下仍然是标准的n uniton扩张解,因而Dressing作用保持有限调和映射的极小uniton数不变 (后面的结论已被Guest和Ohnita证明)。特别证明对于全纯映射,Dressing作用仅与群元素在零点值有关。此性质表明Loop群在全纯映射上的作用与复线性群在复Grassman nians上的标准作用是等价的。     

推荐一种新方法 强化期刊社会效益

提出了质量功能扩展方法与编辑系统相结合的方法,即质量功能扩展系统方法,并给出强化系统功能的简单表达式。表达式中以“效益”作为功能强化因子,而因子为系统接受系统外部环境的信息,即用“读者要求”协调和强化编辑系统功能。通过逐层和逐级系统功能的扩展,使刊物社会功能尽量与实际情形相符合。     

群锥上Siegel域的扩充空间

利用复流形F(-Lij;i,j=1,…,k)及群锥的构造特征,给出了群锥上Siegel域的扩充空间.     

一种基于扩展Infomax的自适应学习算法

独立向量分析根据信源统计独立特性对观测信号进行分离运算,扩展Informax算法既能分离超高斯信号,也能分离亚高斯信号,得到广泛的应用。本文基于扩展Infomax算法特点,提出了一种自适应的学习算法,该算法使得学习步长根据信号的代价函数变化而变化,克服了扩展Infomax算法在稳态步长调整过程中的不足,仿真结果证实了该算法的有效性。     

‘More [Time] is better or less is more?’ Neoliberal influences on teaching and learning time

This article examines the neoliberal influences on ‘Port City Schools’ (PCS) unique district-wide extended learning time (ELT) initiative. Despite the recent popularity of ELT in urban schools, there have been few qualitative studies that question how stakeholders make sense of ELT on the ground. This research fills that gap in the literature by exploring ELT programming across PCS’s choice and neighborhood K-8 schools. The interview and observation data reveal an inherent tension between ‘more time is better’ in the enrichment-filled choice schools and ‘less is more’ in the intervention-filled neighborhood schools. Findings illuminate the ways in which school choice, neighborhood segregation, and high stakes testing push the district to use ELT to boost test scores in the lower performing neighborhood schools, while the choice schools are given flexibility in ELT programming because they are meeting expectations for student success. Because neoliberalism fails to take into account the strong relationship between test scores and socio-economics and school choice and segregation, it leads to a cycle of inequality in which children in the choice schools receive a well-balanced curriculum and children in the neighborhood schools get test preparation during ELT. Fixing this system could fix inequalities in ELT programming across all schools.