地球远磁尾磁重联的数值模拟研究

采用混合模拟法研究地球远磁尾磁场重联过程,分析了离子温度的特性及其在出流区的动力学问题.磁场重联过程使离子温度在等离子体片边界层中显著升高的同时,在重联边界层过渡区表现出了十分明显的T‖T⊥的温度各向异性,而激波的上游区温度情况却与之相反.速度分布的模拟结果显示,出流区离子速度分布随着磁场重联的发展和演化逐渐偏离了初始的麦克斯韦分布,出现部分球壳状的分布.重联进一步演化之后,离子在速度空间分离成两部分,形成类哑铃状分布位形.     

2006年中国高校十大科技进展评选揭晓

由教育部科学技术委员会评选的“2006年度中国高等学校十大科技进展”结果揭晓。这十大科技进展分别是： 北京大学主持的“磁重联零点及其邻近磁场结构的卫星观测研究”；     

揭开太阳耀斑爆发之谜

科学家一直想弄清楚是什么引起了耀斑爆发和日冕物质抛射,但只有在大约最近十年中,观测才达到足够的水准,足以揭露出它们的纷繁复杂,阐明它们背后的物理机制。结果证明,问题的关键在于磁力线突然的重新排布,这种现象被称为磁重联。     

金星发现 磁场重联现象

据欧洲空间局（ESA）网站报道,金星被一层浓厚的大气层包围．并且其并不拥有全球性偶极磁场。然而即便这颗行星缺乏磁层的保护,金星附近的空间区域中确实同样存在着类似其他行星,如地球一样的一些相似之处。其中最新发现,也是最让人意外的一点便是近期发现金星诱发磁场的磁尾处存在磁场重联现象。     

复合磁垒纳米结构中的量子输运

提出了复合磁垒的概念并研究了复合磁垒纳米结构中电子的隧穿输运性质.对照相应的非复合磁垒结构,这种磁纳米结构大大增强了电子的波矢滤波特性.当考虑电子的自旋与非均匀磁场的相互作用,这种磁垒纳米结构具有很强的电子自旋极化效应.     

复合磁垒纳米结构中的量子输运

提出了复合磁垒的概念并研究了复合磁垒纳米结构中电子的隧穿输运性质.对照相应的非复合磁垒结构, 这种磁纳米结构大大增强了电子的波矢滤波特性.当考虑电子的自旋与非均匀磁场的相互作用,这种磁垒纳米结构具有很强的电子自旋极化效应.     

动车组车钩重联失败故障分析及处理

车钩用于链接车辆与车辆或列车与列车是保障动车组安全、正点、稳定运行的关键部件之一;安装在动车组头尾车前罩内的自动密接式车钩,在两列动车组重联运行时,能够实现动车组与动车组之间的机械、电路和气路的自动连接。以CRH2A(统型)动车组为例,介绍了动车组车钩的结构与功能,分析了车钩重联失败的原因,提出了日常维护注意事项和处理措施,对提高动车组车钩运用质量,保证动车组列车安全平稳运行,维护高速铁路正常运输组织秩序都具有重要意义。     

超磁致伸缩器的热补偿研究

超磁致伸缩材料的热效应严重影响其控制精度.文章分析了超磁致伸缩器系统的热源,采用试验的方法确定了一定条件下的热应变和磁应变;设计了适合超磁致伸缩器的冷却子系统;基于热应变和磁应变试验曲线提出了软件向上补偿方法.     

2006年中国高校十大科技进展评选揭晓

2006年度教育部科学技术委员会全会12月27日在北京召开,会议宣布了教育部科技委“2006年度中国高等学校十大科技进展”的评选结果并颁奖。这十大科技进展分别是:北京大学主持的“磁重联零点及其邻近磁场结构的卫星观测研究”;北京大学主持的“三苯氧胺诱发子宫内膜癌的分子机理”;北京邮电大学主持的“高速窄线宽可调谐的解复用光接收集成器件及其关键制备工艺”;华东理工大学主持的“多喷嘴对置式水煤浆气化技术”;南方医科大学主持的“血管紧张素转换酶抑制剂治疗晚期慢性肾脏病的研究”;南京大学主持的“银河系英仙臂距离的高精度测定”;…     

水轮发电机失磁保护动作行为分析及改进措施

通过水轮发电机失磁及失磁保护动作实验的相关数据,分析了失磁保护动作行为,给出了改进措施.     

脉冲电流测量装置设计

为准确测量重接式电磁发射装置中的脉冲大电流,设计了一个Rogowski线圈,阐明了其设计原理,分析了电流变化对Rogowski线圈本身参数(电阻、电感)的影响,并针对重接式电磁发射线圈电流的特殊性,采用了适当的外部接线方式。最后,采用此系统测量了重接式电磁发射装置中的电流,取得了令人满意的效果。     

Valuing and Desiring Purposes of Education to Transcend Miseducative Measurement Practices

Abstract

The separating and isolating tendencies of measuring practices can lead educators to lose sight of the aims and purposes of education. These end purposes can be used to guide and ensure that the activities of educators are educational, and therefore, Biesta recommends there is a need for educators to reconnect with them. This article. explores this notion of a ‘reconnection’ and argues that if educators are to challenge any potentially miseducative measuring practices, then this reconnection must require educators to value and desire particular end purposes. Desires are recognised to be existential in character and are identified as being necessary for initiating actions. It is argued here that this aspect of desires is important for understanding the significance of a ‘reconnection’ because without it the purposes of education may remain only as abstract philosophical ideals. To make a difference and to challenge the isolating and miseducative tendencies of some measuring practices, educators must come to value particular purposes of education, and in addition, they must exercise the courage to enact them. This can be made possible because educators strongly care for and desire the actualisation of the purposes to which they are connected.     

都市里的乡村记忆——论王安忆小说《上种红菱下种藕》

王安忆在本篇乡土题材小说中显示了都市视角和乡村视角的互动。她在对都市现实的追寻叙写当中,一次偶尔对乡村的伫足观望,显示出一种田园诗意的选择,是对当前都市文化流俗的排斥,从而进行了一次灵魂的洗礼。     

Being more human: rooting learning analytics through resistance and reconnection with the values of higher education

ABSTRACT

Universities are now compelled to attend to metrics that (re)shape our conceptualisation of the student experience. New technologies such as learning analytics (LA) promise the ability to target personalised support to profiled ‘at risk’ students through mapping large-scale historic student engagement data such as attendance, library use, and virtual learning environment activity as well as demographic information and typical student outcomes. Yet serious ethical and implementation issues remain. Data-driven labelling of students as ‘high risk’, ‘hard to reach’ or ‘vulnerable’ creates conflict between promoting personal growth and human flourishing and treating people merely as data points. This article argues that universities must resist the assumption that numbers and algorithms alone can solve the ‘problem’ of student retention and performance; rather, LA work must be underpinned by a reconnection with the agreed values relating to the purpose of higher education, including democratic engagement, recognition of diverse and individual experience, and processes of becoming. Such a reconnection, this article contends, is possible when LA work is designed and implemented in genuine collaboration and partnership with students.     

Rupture and repair: Episodes of resistance and resilience in teachers’ learning

This action inquiry article examines veteran teachers’ learning in a week-long professional development seminar. We describe moments of disconnection in key learning relationships (teacher, learner, text) and analyze relational–cultural dynamics that contributed to the disconnections. We investigate the dynamics that facilitate repair within the relationships. We argue that disconnections were often acts of resistance which preserve teachers’ sense of self as learner. We aver that moments of reconnection were acts of resilience. This study’s significance demonstrates the inherent links between resistance and resilience. Implications point to the centrality of taking an inquiry stance in the study of professional development experiences.     

An African-centred approach to land education

Approaches to environmental education which are engaging with place and critical pedagogy have not yet broadly engaged with the African world and insights from Africana Studies and Geography. An African-centred approach facilitates people’s reconnection to places and ecosystems in ways that do not reduce places to objects of conquest and things to be exploited for profitability and individual gain. Such an approach offers effective critiques of settler coloniser perspectives on the environment and deeper understandings of the relationship between worldview and ecologically sensitised education. Through examples from Africana Studies and Geography, this article provides an introduction to how an African-centred approach can contribute to the development of a Land Education perspective and improve college-level environmental education.     

Rethinking Environmental Education with the Help of Indigenous Ways of Knowing and Traditional Ecological Knowledge

In recent years, Indigenous ecological knowledge has been receiving increased attention due to its potential to help address the devastating impacts of climate change and environmental degradation. Indigenous peoples in various contexts have become engaged in collaborative research projects with scientists and other experts to build environmentally sustainable societies. Environmental education has been another site for incorporation of Indigenous knowledge systems and ways of knowing. This paper presents one such programme designed by the Bunun Indigenous group in Taiwan to support environmental learning and reconnection with the natural world of their group as well as other Indigenous and non-Indigenous individuals willing to participate. While the programme's objective is learning with and from the natural environment (the lessons that can be adopted by non-Indigenous groups), its other objectives include re-building and strengthening Indigenous identities, cultures and ways of life, and potentially contributing to decolonisation of settler societies and reconciliation between groups.     

Recovering lost histories of educational design: a case study in contemporary participatory strategies

Past practices shape and limit the design imagination of teachers, pupils, parents, governors, and others concerned with designing modern schools. Bringing histories of education to the table in the participatory design process of new school buildings and curricula is necessary. Schools having an extraordinary past have the potential to draw from that prefigurative practice. This paper reports a case study on how the Kees Boeke School in The Netherlands recently has returned to its own history in addressing the needs of its current and future learners in a redesign project. Through addressing the question of how the redesign might reflect a reconnection with the original vision of education espoused by Boeke—learning in relative freedom, with awareness of responsibilities for own and community’s well-being—the school management, architects, teachers, and students took part in a participatory design process. That process and the resulting school design is discussed. From this case study we argue that past adventures in education can inspire current redesign. Past experiences as well as concerns and beliefs about the future are an inevitable influence on initiatives to realise schools for the future, both for schools with experimental and those with traditional histories.     

大鳍鱯繁殖期主要组织器官的氨基酸和脂肪酸组成

采用生物化学方法的方法,对大鳍鱯繁殖期的性腺、肝脏、肌肉的氨基酸和脂肪酸进行测定．结果表明：大鳍鱯雄性亲鱼精巢、肝脏和肌肉中,肌肉中氨基酸总量最高,为40．90g／100g;其次是精巢,为26．38g／100g;肝脏中含量最低,为18．38g／100g。从必需氨基酸占总氨基酸的比例来看,精巢最高,占53．41％;其次是肌肉,占52．93％;肝脏中最低,占51．96％。雌性亲鱼肌肉中氨基酸总量最高,为40．61g／100g;其次是卵巢,为22．42g／100g;肝脏中含量最低,为17．04g／100g。从必需氨基酸占总氨基酸的比例来看,卵巢最高,占52．85％;其次是肝脏,占51．76％;肌肉中最低,占49．OO％。从脂肪酸组成来看,雌雄亲鱼均为MUFA所占比例最高,其次是SFA,PUFA比例最小。雄鱼与雌鱼的三种组织器官中,所占比例较高的脂肪酸相似,它们是C18：1n．9（油酸）、C16：0（软脂酸）、C18：2n-6（亚油酸）和C16：1n-7（棕榈酸）。研究揭示了大鳍鱯繁殖期雌、雄亲鱼主要组织器官在物质构成上的特性。     

《周易》文学批评思想管窥

《周易》是一部占卜之书，但其中所体现的文学批评思想则是相当丰富的。其一是关于文学本质的认识，事实上它同古希腊时出现的文学“摹仿”说有着异曲同工之妙。《周易》中对文学艺术本质的认识也是这种摹仿的观点，而且这种摹仿是对客观存在的直接再现。其二是关于文学体裁，《周易》中所体现的文学体裁思想是后世文学体裁的一个源头。其三是关于情与辞，《周易·系辞》进一步探讨了情与辞的内在联系，辞的风格往往因情的不同而不同。其四是关于文学的审美，《周易》中的审美思想，主要体现在两个方面：一是八卦的审美卦象；二是断辞的审美内涵