光子晶体滤波器的滤波品质调制因素研究

利用传输矩阵法理论,通过数值计算模拟的方法,研究各种结构参数对光子晶体滤波器滤波品质的调制机制,结果表明:对于双正介质光子晶体,当光子晶体或光子晶体量子阱的排列周期数越大,或基元介质高折射率介质的折射率越大,光子晶体滤波器的滤波品质越高;对于单负介质光子晶体,当光子晶体介质层厚度越大,光子晶体滤波器滤波品质也越高;当双正介质光子晶体的介质换成双负介质时,光子晶体滤波器的滤波品质会降低,但随着双负介质折射率的负值增加,滤波品质会上升。光子晶体或光子晶体量子阱结构参数对滤波器品质的调制机制,为设计光子晶体滤波器以及形成其有效调制机制提供理论参考。     

从“宕昌县”的“tan＂音进入《现代汉语词典》说起

“名从主人”是确定地名字形、字音的一个基本原则.有些地名字形稳定,但读音特殊,如甘肃省“宕昌县”的“宕”字读“tan”音,在词典中能否吸收？笔者认为,乡镇以上地名的“异读”应作为“又音”收入词典,村名的“异读”则不宜收入,可收入《地名录》或地方志中.     

The influence of university departments on the evolution of entrepreneurial competencies in spin-off ventures

The influence of the university department upon spin-off venture evolution is complex and dynamic. We examine how the university department context influences the spin-off process from the perspectives of both the spin-off venture and the department. By comparing the development of entrepreneurial competencies within spin-offs based in different departments at the same universities we observed significant differences in early venture performance. Small differences in initial departmental support from management and senior academics for gaining commercial experience and spending time exploring the commercial opportunity were seen to have a major impact upon the subsequent spin-off development path. Supported ventures gained momentum as the department helped develop entrepreneurial competencies and influenced how these competencies were developed from external actors outside the department. By contrast, a lack of departmental support for entrepreneurship severely constrained the evolution of spin-offs regardless of university level policies and practices. This emphasizes the need for a shift in focus from the well-studied university level to the relatively neglected department level to help explain institutional differences in university spin-off activity.     

从卦辞爻辞到传辞——对《周易》古经衍化的思考

《周易》是一本占筮之书,包含有一整套占筮术语,成书年代大约是在西周的初期,作者应当是周代的筮官。经历了从卦辞到爻辞再到传辞的演变过程,从简朴至繁冗,从单纯的记录整理到理性思维的跃迁,而《周易》之朴素的本义也渐被掩盖和歪曲。真正地抱着实事求是的态度来解释《周易》是从近代学者开始的。     

肝细胞癌分子标志物研究的探讨

肝细胞癌(HCC)分子标志物的筛查和评价是一项重要而庞大的工程,需要大量的病例积累及各个实验室的通力合作。然而,由于对HCC的认识不足及标志物检测、评价方法的差异造成了各实验室数据交流及病例共享的极大障碍。对HCC标志物筛查及评价中常见的一些问题进行了探讨并提出建议,以期引起研究者对肿瘤标志研究规范化问题的重视。     

Motivation and the adult Irish language learner

What motivates adult language learners in the city of Belfast to enrol and remain in an Irish class in the first years of the twenty-first century is the subject of the research study reported here. The research is placed within the context of the long history of interest in Irish revival in the city as far back as the eighteenth century and is related to relevant literature on motivation and language learning. The paper provides results from quantitative data collected by means of questionnaires issued to learners throughout the city. An overwhelming interest in culture is what primarily motivates these learners to enrol in an Irish class. Learners are also motivated by a strong sense of identity and by a felt obligation to help preserve the language. The paper illuminates issues of language restoration and the links between identity and language preservation. The research reported here contributes to the literatures on motivation, on adult learning and on language survival.     

Drawing out the value of the visual: children and young people theorizing time through art and narrative

This article examines the role that drawing can play in enabling children and young people to theorize concepts of time. In two, independent Australian research projects, children aged between 5 and 8 years were asked to respond to the question, ‘What might the future be like?’, while 12–14 year olds were asked, ‘What does history look like?’ There are points of connection and convergence in the analysis of the drawings and the ways in which the children articulate their visual representations of temporality to demonstrate deep and philosophical insights. This research illuminates possibilities for both the value of art practices in learning and the capacity for such approaches in schools. It disrupts narrow visions of neoliberal policy that privileges the teaching of literacy and numeracy in schools and seeks to transform children and youth into particular citizens for the future. We argue that expanding our view of the use and value of visual forms of learning and expression can contribute to a more layered and complex understanding of the capacities of children and young people. Further, this research contributes to better understanding of how students navigate challenging local curriculum and school terrain as they are increasingly posited as global citizens.     

论Sylow p-子群循环的18pn阶群的同构分类

设p为奇素数,且p＞3,对Sylow p-子群循环的18pA阶群进行了完全分类并获得了其全部构造:当p≡1 (mod 18)时,G恰有19个彼此不同构的类型;当p≡5或11或17 (mod 18)时,G恰有10个彼此不同构的类型;当p≡7或13 (mod 18)时,G恰有17个彼此不同构的类型.     

基于路由协议PMTU对IPv6网络发现与支持的研究

计算机技术发展迅速,PMTU路由协议在新型网络中得到了持续应用与开发,IPv6就是一个例子.在对路由协议中的算法进行分析研究之后,利用原有的技术向其他方面拓展,其中可以利用原有的MTU值,因其数据在原有的路由中有路由信息的储存,则可以减少其在网络的信息传输过程中的步骤,只需向最初的路由进行探测即可.对其实际工作能力进行仿真测试,从结果中可以观察到,与传统机制相比,在传输速度上有了很好的提升.