Klein-Weyl's program and the ontology of gauge and quantum systems

We distinguish two orientations in Weyl's analysis of the fundamental role played by the notion of symmetry in physics, namely an orientation inspired by Klein's Erlangen program and a phenomenological-transcendental orientation. By privileging the former to the detriment of the latter, we sketch a group(oid)-theoretical program—that we call the Klein-Weyl program—for the interpretation of both gauge theories and quantum mechanics in a single conceptual framework. This program is based on Weyl's notion of a “structure-endowed entity” equipped with a “group of automorphisms”. First, we analyze what Weyl calls the “problem of relativity” in the frameworks provided by special relativity, general relativity, and Yang-Mills theories. We argue that both general relativity and Yang-Mills theories can be understood in terms of a localization of Klein's Erlangen program: while the latter describes the group-theoretical automorphisms of a single structure (such as homogenous geometries), local gauge symmetries and the corresponding gauge fields (Ehresmann connections) can be naturally understood in terms of the groupoid-theoretical isomorphisms in a family of identical structures. Second, we argue that quantum mechanics can be understood in terms of a linearization of Klein's Erlangen program. This stance leads us to an interpretation of the fact that quantum numbers are “indices characterizing representations of groups” ((Weyl, 1931a), p.xxi) in terms of a correspondence between the ontological categories of identity and determinateness.     

新型大功率氧化物导电陶瓷

介绍一种新型大功率氧化物导电陶瓷．该陶瓷是以六角密堆（ＨＣＰ）结构的ＺｎＯ为主要原料，添加少量杂质，采用电子陶瓷工艺研制而成．研究了陶瓷材料的差热分析（ＤＴＡ）及扫描电子显微结构．测量了瓷体的电阻率．     

基于QFD的网站用户需求分析

以最终用户满意为驱动力,基于质量功能展开原理,提出一种将网站用户需求转化为对网站各个环节的要求的多层次演绎分析方法,即网站用户需求展开,为将用户满意理念贯穿于网站的设计与管理之中提供了理论框架与操作方法。     

试就猝死病例谈中老年教职工保健工作

本文报告5例心性猝死(3例为冠心病性猝死),年龄为39—69岁。认为冠心病是中老年教职工猝死的主要原因,因而提出学校对他们的保健重点应放在防治冠心病上。     

中国共产党人对马克思主义民生理论的创新与实践

马克思主义唯物史观、政治经济学和科学社会主义中包含着丰富的民生内容。解放全人类、实现人的自由全面发展,是马克思主义所追求的崇高的民生目标。中国共产党在领导新民主主义革命和探索社会主义建设道路的过程中,把马克思主义民生理论与中国实际相结合,开创了解放民生、保障和改善民生的理论与实践的新时代。改革开放以来,中国共产党人在继承和发展马克思主义、毛泽东思想的基础上,形成了中国特色社会主义民生理论体系,并以此为指导,在保障民生、改善民生、富裕民生的建设实践和奋斗目标中不断推进中国特色社会主义民生事业的发展。     

“斧声烛影”及宋太宗即位考论

宋僧释文莹在其史料笔记《续湘山野录》中记载了宋太宗即位之事,留下＂斧声烛影＂之谜,南宋李焘引入所著《续资治通鉴长编》之中,遂使＂斧声烛影＂成为中国历史上的悬案之一,留下了众多的疑点：太祖是否为太宗所弑？太宗即位是否合法？对此,宋代官修国史、实录均讳莫如深,历代学者对此争论不休。文章结合宋代史料,以文献为依据,从史实出发,对以上问题进行了考证,得出宋太宗为非法即位的结论。     

论李煜词几类常见意象的审美意蕴

"意象"是创作主体和客体相融合的产物,是客体中寄寓了主体的主观情思的具体形象,是客体经过主体的艺术物化所产生的结果。李煜词中的意象运用丰富多彩,其中有"愁"意象、"梦"意象、"月"意象,这些意象的运用,有助于我们对李煜的词作深一层的了解。     

ρ*混合序列的Chover型重对数律

设{X_n,n≥1}是同分布的ρ^*混合序列, 其分布属于特征指数为α(0<α<2)的非退化稳定分布正则吸引场. 利用ρ^*混合序列的矩不等式证明了依概率1有,并获得了一系列等价条件.     

On the mechanism of inhibition of p27 degradation by 15-deoxy-Δ12,14-prostaglandin J 2 in lymphoblasts of Alzheimer’s disease patients

It has been proposed that neuroinflammation, among other factors, may trigger an aberrant neuronal cell cycle re-entry leading to neuronal death. Cell cycle disturbances are also detectable in peripheral cells from Alzheimer’s disease (AD) patients. We previously reported that the anti-inflammatory 15- deoxy-Δ^12,14-prostaglandin J ₂ (15d-PGJ ₂) increased the cellular content of the cyclin-dependent kinase inhibitor p27, in lymphoblasts from AD patients. This work aimed at elucidating the mechanisms of 15d-PGJ ₂-induced p27 accumulation. Phosphorylation, half-life, and the nucleo-cytoplasmic traffic of p27 protein were altered by 15d-PGJ2 by mechanisms dependent on PI3K/Akt activity. 15d-PGJ ₂ prevents the calmodulin-dependent Akt overactivation in AD lymphoblasts by blocking its binding to the 85-kDa regulatory subunit of PI3K. These effects of 15d-PGJ ₂ were not mimicked by 9,10-dihydro-15-deoxy-Δ^12,14- prostaglandin J ₂, suggesting that 15d-PGJ ₂ acts independently of peroxisome proliferator-activated receptor γ activation and that the α,β-unsaturated carbonyl group in the cyclopentenone ring of 15d-PGJ ₂ is a requisite for the observed effects. Received 14 July 2008; received after revision 2 September 2008; accepted 12 September 2008     

教育在贫困地区促农增收中存在的问题与对策——基于云南省广南县大革假村的调查与分析

教育促进农民增加收入的作用不够明显,与贫困地区的社会经济发展状况及教育自身存在的问题不无关联。根据分析,普遍较低的受教育程度、教育费用负担、高学历人员的流失、课程的适应性不够等方面都可能是造成这一现状的原因,并针对这些问题提出了相应的对策。