摘要：无线射频识别技术(RFID技术)利用无线射频方式在读写器和射频卡之间进行非接触双向数据传输,以达到目标识别和数据交换的目的。目前,该技术已经广泛应用于生产、生活的各个领域,并且在军事方面也有着越来越重要的地位。但是,由于该技术在最初的应用设计和开发过程中,没有考虑安全问题,导致了安全问题日益凸显,现在已经成为制约RFID应用尤其是军事方面应用的重要因素。主要分析了RFID技术存在的安全问题,对其存在的安全攻击方式及安全机制。并对目前常用的安全协议进行了对比分析,以达到认识存在的安全隐患的目的。

摘要：传统的二代压水反应堆主要是采取鼓风机鼓风的方式对控制棒驱动机构(Control Rod Drive mechanism,CRDM)进行强制通风冷却,该冷却方式耗能较大且无法保证绝对安全可靠。本文针对于大亚湾核电站中CRDM群的布置方式,采用中广核新型的EMC-B型控制棒驱动机构的结构及材料物性参数,运用了计算流体力学(Computational Fluid Dynamics,CFD)分析方法,研究了当采用空气自然循环冷却方式时,CRDM群及各线圈的温度分布,探索对CRDM群采用空气自然循环冷却方式的可行性。模拟分析结果表明:总体来看,处于外围和中心位置处的CRDM的线圈温度,要比中间区域的CRDM线圈温度高;对于给定计算工况,各线圈的最高温度为198°C,低于限制温度(200°C),表明对于所研究的CRDM群,依靠空气的自然对流,可以对CRDM进行有效冷却。计算结果可为新型CRDM群分布设计提供参考。

摘要：This paper is going to explore Roland Barthes,Michel Foucault and Wolfgang Iser’s theories upon the question,death of the author,from three aspects comparatively:What is the connotation of the author in their understandings respectively?Why is death of the author necessary in modern or postmodern period?What will take the author’s position after its death?Through detailed analysis and comparison of their texts and propositions,this paper attempts to indicate that Barthes advocates that textual meaning is within text itself,dispels author’s conclusiveness on meaning of a text,and suggests the openness and multiplicity of textual *** reexamining the writing subject and redefining the function of author,Foucault indicates that the concept“author”is a function of *** degrades author’s crucial significance in the process of textual interpretation,but keeps author as an existential mode of *** Iser states that the meaning of a text generates from the reading process,a dialogue between the text and its *** a literary text is finished,it remains quite and full of potentialities,waiting for reader to unfold itself,waiting to realize itself in reading process.