Use of place information for improved event tracking

The main purpose of topic detection and tracking (TDT) is to detect, group, and organize newspaper articles reporting on the same event. Since an event is a reported occurrence at a specific time and place and the unavoidable consequences, TDT can benefit from an explicit use of time and place information. In this work, we focused on place information, using time information as in the previous research. News articles were analyzed for their characteristics of place information, and a new topic tracking method was proposed to incorporate the analysis results on place information. Experiments show that appropriate use of place information extracted automatically from news articles indeed helps event tracking that identify news articles reporting on the same events.     

基于读者行为追踪的智能服务研究——以帆布指纹识别与CNZZ为例

[目的/意义]高校图书馆为了掌握读者信息需求动态数据。[方法/过程]利用帆布指纹识别与CNZZ两种方法进行读者信息追踪,获取读者信息行为,在法律与道德允许范围内,从获取的数据中挖掘读者需求信息。通过对高校读者的信息行为的特征需求分析,匹配与图书馆拥有的信息资源并通过网络平台推送至读者。[结果/结论]借助于智能推荐系统,能够促进服务由粗放化向精细化转变,用以提高图书馆智能化服务水平。     

浅谈异体字整理的理据性

上世纪50年代所进行的异体字整理,采用了较为简单的“从俗、从简、书写方便”的原则,虽然取得了一定的成就,但从整个汉字系统而言,却使一些选用字丧失理据性,造成一定程度的失误。我们在今后的字形规范中重点应放在优化不合理的字形结构上。     

Genetic analysis of fruit shape traits at different maturation stages in sponge gourd

The fruit shape is important quantitative trait closely related to the fruit quality. However, the genetic model of fruit shapes has not been proposed. Therefore, in the present study, analysis of genetic effects for fruit shape traits （fruit length and fruit perimeter） in sponge gourd was conducted by employing a developmental genetic model including fruit direct effects and maternal effects. Analysis approaches of unconditional and conditional variances were applied to evaluate the genetic behavior of fruit shape traits at economical and physiological maturation times. The results of variance analysis indicated that fruit length and fruit perimeter were simultaneously affected by fruit direct genetic effects and maternal effects. Fruit direct genetic effects were relatively more important for fruit shape traits at whole developmental period. The gene expression was most active at the economical maturation stage （1-12 d after flowering） for two shape traits, and the activation of gene was mostly due to direct dominance effects at physiological maturation stage （13-60 datter flowering）. The coefficients due to different genetic effects, as well as the phenotypic correlation coefficients, varied significantly between fruit shape traits themselves at various maturation stages. The results showed that it was relatively easy to improve fruit shape traits for industrial purpose by carefully selecting the parents at economical maturation stage instead of that at physiological maturation stage.     

损失规避下的指数跟踪问题及其粒子群算法求解

随着指数衍生产品日益受到重视,指数化投资组合常被传统的消极基金管理者或机构所采用,而用有限的资金按指数构成比例进行投资显然是不现实的,所以指数的最优误差追踪就显得更加重要。将追踪误差定义为证券投资组合收益率与所追踪的指数基准收益率之差的均值平方和的平方根,建立了基数约束（即总资产数不超过某个特定整数K）下考虑投资者损失规避决策偏好的跟踪误差最小化模型,并设计了一个粒子群算法求解模型。实际算例表明,所构建的模型和算法是有效的。     

强酸-弱酸混合体系中准确滴定强酸的研究

为准确滴定出强酸-弱酸混合体系中所含强酸的量,需考虑在不同的准确度要求条件下,混合酸体系中弱酸的浓度范围要求。基于混合酸滴定过程终点误差的2个来源分析,提出了混合酸体系中终点误差(TE)计算的新方法。在指定的终点误差要求和强酸的浓度范围条件下,计算了HCl-HAc、HCl-六次甲基四胺盐两种混合酸体系中HAc、六次甲基四胺盐浓度范围要求,随着各酸碱指示剂变色点pH值的增大,两弱酸浓度的上限要求逐渐减小。在|TE|=1%条件下,当HAc、六次甲基四胺盐浓度分别低于1.18和0.135 mmol/dm3时,可采用任意酸性指示剂准确滴定0.1 mol/dm3浓度范围的HCl含量;而当两弱酸浓度分别低于10.6和10.5 mmol/dm3时,准确滴定出混合酸体系中1.0 mol/dm3的HCl含量亦可采用任意酸性指示剂。     

高职学生英语写作动名搭配错误分析

对高职学生作文出现的动名词搭配错误进行统计分析和分类,旨在探讨高职学生动名词搭配错误的特征,分析高职学生动名搭配错误的原因,诊断数据显示语际干扰、语内干扰、诱导错误和不确定因素等是造成动名搭配错误的主要原因;对英语写作教学提出建议,在教学中应综合运用对比分析策略、进行动词辨析和利用语料库资源等方式。     

自动跟踪补偿消弧线圈在配电网中的选用

目前,我国城市配电网中电力电缆的应用愈来愈广泛,系统电容电流越来越大,在发生单相接地时电弧不能熄灭,会造成电弧间歇性的熄灭与重燃,形成弧光接地电压或激发磁谐振危及电气设备绝缘,严重时有可能发展为相间短路,引起事故。为限制单相接地故障电流,6-35KV系统采用中性点通过消弧线圈接地来补偿单相接地时的电容电流使电弧熄灭,限制弧光接地过电压和消除铁磁谐振过电压,现已取得较多的运行经验和较好运行效果。     

谈广告中常见的逻辑问题

广告需要创意,但创意无论多么新奇也不能违反逻辑。但是现今媒体上听到、看到的广告却充斥着大量的逻辑错误,给公众一种误导:似乎广告是可以脱离逻辑的一种特殊语言形式。文章通过分析几个广告案例揭示其中常见的逻辑错误。     

物料跟踪系统在步进式加热炉上的应用

以河北唐银钢铁有限公司棒材、高线两条轧钢生产线的步进式加热炉实现物料跟踪的全过程为例,论述了步进式加热炉物料跟踪的理念、跟踪的实现过程,重点分析了实现加热炉钢坯物料跟踪的方法和影响跟踪过程准确的几个关键要素:包括装钢定位、步距调整、有钢判断、位置跟踪、炉号跟踪等.提出准确是物料跟踪的核心,实现跟踪准确的前提是控制好炉底...