单锥上第一类Siegel域的扩充空间

本文给出一类齐性复解析流形及某些子流形,并应用它实现陆启铿、钟家庆在［１］中给出的单锥上的第一类Ｓｉｅｇｅｌ 域的扩充空间。从扩充空间上的运动群在超圆上的限制得到单锥上第一类Ｓｉｅｇｅｌ 域的仿射自同胚群     

概率赋范空间的局部有界与可赋范化

讨论了概率赋范空间的局部有界性,阐明了局部有界的概率赋范空间与赋范空间的关系,给出了概率赋范空间可赋范化的充要条件,提出了广义概率赋范空间和最佳广义弱ｔ－模的概念,在这些新概率之下讨论了一些相应的问题。     

关于洛伦兹变换的推导

针对现行教材中狭义相对论时空坐标洛伦兹变换推导的缺点,本文给出了一个全面简单的推导过程,这个推导过程能够使得学生真正理解狭义相对论的物理意义．     

严格凸Banach空间中最佳逼近元的存在与唯一性

在严格凸Ｂａｎａｃｈ空间中,引入保持严格凸性的范数,得到了严格凸Ｂａｎａｃｈ空间积空间的严格凸性,证明了单空间和积空间中关于无穷维紧凸子集最佳逼近元的存在与唯一性定理,改进和推广了某些已有结果。     

POSITIVE MAGNETORESISTANCE IN NI/W SUPERLATTICES

ＩＮＴＲＯＤＵＣＴＩＯＮＴｈｅｍａｇｎｅｔｉｃａｎｄｔｒａｎｓｐｏｒｔｐｒｏｐｅｒｔｉｅｓｏｆｔｈｉｎｍａｇｎｅｔｉｃｍｕｌｔｉｌａｙｅｒｓｈａｖｅａｔｔｒａｃｔｅｄｃｏｎｓｉｄｅｒａｂｌｅａｔｔｅｎｔｉｏｎｄｕｒｉｎｇｔｈｅｐａｓｔｙｅａｒｓ.Ｓｉｎｃｅｄｉｓｃｏｖｅｒｙｏｆｎｅｇａｔｉｖｅｇｉａｎｔｍａｇｎｅｔｏｒｅｓｉｓｔａｎｃｅ (ＧＭＲ)ｂｙＢａｉｂｉｃｈｅｔａｌ.ｉｎＦｅ/Ｃｒｍｕｌｔｉｌａｙｅｒｓ (Ｂａｉｂｉｃｈ ,1 998) ,ｅｘｔｅｎｓｉｖｅｒｅｓｅａｒｃｈｈａｓｂｅｅｎｄｏｎｅｃｏｎ ｃ…     

Higher stakes – the hidden risks of school security fences for children’s learning environments

In a move away from the open or low-fenced grounds that have traditionally been a feature of Australian school design, the last decade has seen a growth in the installation of high-security fences around schools. These structures, far from being passive and neutral, act to redefine the possibilities for movement and connectivity in the local landscape. This paper looks beyond the impact of fences on safety and security to explore the wider implications of these structures. By bringing together perspectives on children’s experience of independent mobility, belonging and attachment to place, the paper opens up new avenues for thinking about how children’s learning is shaped by the relationship between school, community and the boundaries between them. It provides a starting point for understanding how high-security boundaries can impact on children’s learning and why at times these structures may pose more risks than those they aim to address.     

Safe Spaces,Support, Social Capital: A Critical Analysis of Artists Working with Vulnerable Young People in Educational Contexts

This article provides a critical and thematic analysis of three research projects involving artists working with vulnerable young people in educational contexts. It argues that artists create safe spaces in contrast to traditional educational activities but it will also raise questions about what constitutes such a space for participants. It will then show that skilled artists often mediate dichotomous pedagogical positions, characterised by competency and performance. It will employ the metaphor of a trellis to illustrate how artists provide flexible structure and support whilst allowing freedom and growth. Finally, it will discuss the social impact of the arts through the lens of social capital theory, highlighting the utility of the approach whilst also indicating areas for critical refinement.     

欧几里得位形空间几何性质的曲线坐标表示

通过直角坐标系和曲线坐标系之间的一阶线性映射,研究了欧几里得位形空间几何性质在曲线坐标系下的表示。根据协变性原理写出质点在曲线坐标系中的运动方程,该方程是牛顿第二定律的协变形式。     

局部强序列连通空间

讨论了保聚映射的一些性质,证明了保聚映射保持强序列连通性;并定义了局部强序列连通空间,证明了商映射保持局部强序列连通空间以及局部强序列连通性具有开遗传性和有限可积性;还给出了一些相关的刻画及其性质。     

大城市内部“生产-生活-生态空间”多尺度耦合协调度——以郑州市为例

城市“生产-生活-生态空间”的耦合协调发展是国土空间格局优化的重要基础。本文以郑州市为例,利用POI数据与随机森林模型精准识别2007年和2017年城市内部“生产-生活-生态空间”的分布特征,并运用定量模型多尺度分析“生产-生活-生态空间”的耦合协调度。结果表明：①整体结构特征上,郑州城市内部生态空间数量和所占比例均明显增加,生活空间所占比例相对稳定,生产空间的数量与所占比例变化波动较大。②辖区尺度上,郑州市“生产-生活-生态空间”耦合度不断提高,部分区域呈现出由拮抗时期向协调耦合时期的转化,协调度与耦合度存在一定的空间一致性。③街道尺度上,郑州市“生产-生活-生态空间”耦合度平均水平从磨合时期转为协调耦合时期,其空间差异明显减小,“生产-生活-生态空间”的协调度平均水平由中度失调转为基本协调,协调度水平明显提升。本文通过对城市内部“生产-生活-生态空间”耦合协调度的多尺度分析,旨在为城市层面不同尺度的国土空间规划提供理论参考。