Analysis of low load transients for the Vandellòs-II NPP: Application to operation and control support

The Technical University of Catalonia (UPC) has been jointly working with the Asociación Nuclear Ascó-Vandellòs (ANAV) for a number of years in order to establish, qualify and use best estimate (BE) models for the reactors under the control of ANAV. ANAV is the consortium that is responsible for operation of the Ascó and Vandellòs-II reactors. The reactors are Westinghouse-design three-loop PWRs with an approximate electrical power of 1000 MW. The existing integral plant models for each plant are currently used for many different purposes among which are support of plant operation and control. Quite a number of studies have been done in order to improve both safety and plant competitiveness. Most of these dynamic analyses were carried out in relation to transients starting at nominal full power or at least, very close to full power. This paper develops a specific use of the Vandellòs-II plant model for operation and control support at low power involving new ranges of system actuation parameters. It also examines scenarios that are somewhat different from those typically analysed. The study starts showing the results of an assessment case, which is a start-up test and provides some additional qualification, and subsequently attempts to establish calculations to support both an improvement in feed water controls and to set up operating recommendations for low-load manual operation of feed water turbo-pump. Both results hopefully, will produce an outcome, which leads to an improvement in safety and reduces reactor trip probability.     

EM发酵饲料中主要微生物类群的动态变化

对EM发酵饲料中乳酸杆菌、酵母菌、大肠菌群、腐败菌等微生物类群的动态变化进行了研究。结果表明 :饲料经EM发酵后 ,乳酸杆菌大量增加 ,发酵第4天达到最大值(9.5×108CFU·g-1 饲料) ,大肠菌群与腐败菌被明显抑制。并认为细菌总数与酵母菌数量不能作为评价EM发酵饲料质量好坏的指标。     

网络新闻及其使用

本文介绍了Ｉｎｔｅｒｎｅｔ中网络新闻及其订阅，检查，阅读，消息文件的删除，发送新闻，新闻组的建议以及使用中应注意的事项。     

基于矩阵分解双线性池化的多模态融合虚假新闻检测

现有的大多数虚假新闻检测方法将视觉和文本特征串联拼接,导致模态信息冗余并且忽略了不同模态信息之间的相关性。为了解决上述问题,提出一种基于矩阵分解双线性池化的多模态融合虚假新闻检测算法。首先,该算法将多模态特征提取器捕捉的文本和视觉特征利用矩阵分解双线性池化方法进行有效融合,然后与虚假新闻检测器合作鉴别虚假新闻;此外,在训练阶段加入了事件分类器来预测事件标签并去除事件相关的依赖。在Twitter和微博两个多模态谣言数据集上进行了对比实验,证明了该算法的有效性。实验结果表明提出的模型能够有效地融合多模态数据,缩小模态间的异质性差异,从而提高虚假新闻检测的准确性。     

面向信息处理的突发事件语料库分类体系研究

本文分析了突发事件新闻的特点、建设突发事件新闻语料库的目的和意义,研究了突发事件新闻语料的分类体系和编码。研究结果对突发事件新闻语料库的建设、突发事件新闻信息检索、国家相关部门对突发事件应急处理方案制定以及对流行病学的医学研究等领域具有一定的理论意义和应用价值。     

Commenting in the Online Arab Public Sphere: Debating the Swiss Minaret Ban and the “Ground Zero Mosque” Online

This article focuses on the emerging online Arab public sphere that the web has enabled. It explores how the “local” interacts with the “global,” critically examining their implications on global politics. Specifically looking at online readers' comments about the Swiss minaret ban the so‐called “Ground Zero Mosque,” how does the Arab online public sphere respond to and frame these issues? What implications do these reader frames portend locally and globally? The study analyzes online comments and responses that readers of Al Arabiya.net and Al Jazeera.net posted on related news articles. The article concludes that the new online public sphere does make it possible for Arab citizens to circumvent and challenge traditional authoritarian controls.     

即时定向新闻采集技术研究

互联网的迅速发展带动了信息量的爆炸性增加。如何更快地采集所需信息一直是国内外研究和开发的热点。近年来,不断增长的对特定信息(例如特定领域的新闻)的需求要求有针对性地从指定的网站即时采集相关信息。这些新闻一般具有不可预见性、更新频率较快、时效性强等特点。这要求我们必须能针对这些特点实现即时定向的采集。本文提出了一种有效抓取网页并进行分析的方法,实践表明取得了满意的效果。     

CNC齿轮测量中心驱动控制与传动系统设计

描述了CNC齿轮测量中心的工作特点，着重介绍了测量中心驱动控制系统及机械进给系统的设计，并对机械传动系统的性能进行了分析，验算了主要设计参数。该测量机测量精度高，性能稳定，已开始小规模生产。     

H钢三维数控钻孔机床的液压进给动力头设计

动力头是H钢三维数控钻孔机床的重要组成部件,本设计由于将动力头的主运动与进给运动高度集成.因此具有结构紧凑、重量轻、体积小,刚性好等特点,从而使H钢三维数控钻孔机床的结构简化,降低了制造成本.又由于动力头采用液压驱动,因此具有驱动力大、无级调速、可以在较大范围内进行孔的加工等优点.文章分别对外置液压缸式立式动力头和内置液压缸式卧式动力头的结构与工作原理作了介绍,并对卧式动力头的主运动、进给运动、控制系统以及机械结构特点等进行了分析.对动力头的主要参数和液压缸各部分参数的设计计算作了较详细的介绍.     

浅谈气力提升系统的设计

阐述了气力提升系统的组成、原理、选择原则和设计过程。并对气力提升系统与传统提升装置进行了分析、比较,指出气力提升系统具有设备性能稳定、耗能小等优点,有着很好的应用前景,值得推广。