基于PSA分析事故序列场内工作人员辐射风险研究

从总风险控制的角度,提出了事故工况下场内工作人员剂量与辐射风险接受准则,并建立了相应的评估方法。以典型压水堆核电厂为例,采用概率安全分析（PSA）的全范围事故序列进行验证评价,评估了典型压水堆核电厂事故后场内工作人员的辐射剂量与辐射致死风险。通过验证结果可知,事故后场内工作人员总的辐射致死风险远低于公众由于自然灾害、疾病、交通事故及不同行业的总死亡风险值;事故后工作人员在燃料厂房进行操作时的辐射致死风险占比最高,故工作人员在燃料厂房进行相关操作时,可提前制定相应的辐射防护措施来降低辐射风险;工作群组中其他人员和意外受照人员事故后辐射致死风险占比较高,可通过采用气面罩等方式对气载放射性进行防护以降低其辐射风险。相应的分析结果可为后续核电厂事故后处理方案的制定和事故后场内工作人员辐射防护措施的制定提供借鉴。      

Micro-Service-Based Radio Access Network

The convergence of information, communication, and data technologies(ICDT) has been identified as one of the developing trends of the sixth generation(6G) network. Service-based architecture(SBA) as one of the promising information technology, has been preliminarily introduced into the fifth generation(5G) core network(CN) and successfully commercialized, which verifies its feasibility and effectiveness. However, SBA mainly focuses on the control plane of CN at present and the SBA-CN user plane ...     

Characterization,Expression Profiling,and Biochemical Analyses of the Cinnamoyl-CoA Reductase Gene Family for Lignin Synthesis in Alfalfa Plants

Cinnamoyl-CoA reductase (CCR) is a pivotal enzyme in plant lignin synthesis, which has a role in plant secondary cell wall development and environmental stress defense. Alfalfa is a predominant legume forage with excellent quality, but the lignin content negatively affects fodder digestibility. Currently, there is limited information on CCR characteristics, gene expression, and its role in lignin metabolism in alfalfa. In this study, we identified 30 members in the CCR gene family of Medicago sativa. In addition, gene structure, conserved motif, and evolution analysis suggested MsCCR1–7 presumably functioned as CCR, while the 23 MsCCR-likes fell into three categories. The expression patterns of MsCCRs/MsCCR-likes suggested their role in plant development, response to environmental stresses, and phytohormone treatment. These results were consistent with the cis-elements in their promoters. Histochemical staining showed that lignin accumulation gradually deepened with the development, which was consistent with gene expression results. Furthermore, recombinant MsCCR1 and MsCCR-like1 were purified and the kinetic parameters were tested under four substrates. In addition, three-dimensional structure models of MsCCR1 and MsCCR-like1 proteins showed the difference in the substrate-binding motif H212(X)2K215R263. These results will be useful for further application for legume forage quality modification and biofuels industry engineering in the future.     

极-零点配置自校正的工程实用算法与应用

极-零点配置自校正在实际应用中的主要困难是共计算量大,影响系统的采样频率。本文基于极-零点配置原理,建立起一种组合递推自校正算法,在保持原控制特性的同时,使计算大大简化,有利于捉高采样频率,实现快速运动伺服系统的不同处理方法。文章分别讨沦了确定性系统与受干扰系统的不同处理方法并给出这种算法在电液位置伺服系统上的应用实例.     

二维弹塑性流体力学LSPIC并行程序研究

针对二维弹塑性流体力学非结构网格拉氏应用程序(LSPIC),应用双线性插值、点排序和网格排序三种方法对计算区域进行分解。基于格式所需邻区网格的个数实现区与区之间的消息传递,建立一种非结构网格拉氏程序并行化方法,实现二维弹塑性流体力学拉氏应用程序(LSPIC)程序的并行化。同时进行程序测试和并行效率分析。     

基于增量DFT 的相似时序检索算法

首先提出一种在时域上计算时序数据扩展距离的新算法,该算法时间复杂度为O(n×m),能够解决时序数据在Y轴上的漂移和伸缩后仍然保留相似性的问题;然后提出一种在频域上计算时序数据扩展距离和在长时序中搜索相似子序列的新算法,该算法时间复杂度仅为O(n×fc),效率很高,便于在线实现,而且同样能够适应时序数据扩展距离的定义;最后给出时序数据和线性加权时序数据的增量式DFT算法,可以对长时序的各个窗口进行增量式的降维,将传统的O(n×m×fc)工作改进成O(n×fc).     

Web信息抽取技术在统一检索系统中的应用研究

结合统一检索系统的信息抽取特点,应用基于HTML结构的信息抽取方法,介绍人工找到切割关键信息块的标记和位置的方法,最后提出基于子树广度的Web信息抽取方法,并给出了抽取规则的实现方案及实例.实验证明,该方法在基于Web过程模拟的统一检索系统中能保证很高的数据抽取回召率和查准率,并且成功应用于四家省级科技文献共享平台.     

消费电子技术发展对广播影视新媒体的影响

本文从终端显示技术、多媒体技术节能环保材料与技术等方面较全面的介绍了有关广电的消费类电子产品,最后提出了广播影视新媒体应对消费电子行业发展对策及建议.