橄榄树距离和及平均距离的求解

树是图论中一个极其有趣且重要的研究课题,有着较好的应用价值和广阔的研究前景,由于其本身的多样性,使得研究者们纷纷沉醉其中.本文求出了一类树——橄榄树的距离和及平均距离.     

浅述图书编目工作与读者服务

文章简述了编目工作的概况,分析了编目工作与读者服务的关系,在此基础上提出了从提高编目深度、广度、调研目录利用状况以及做好利用目录的辅导工作和怎样提高编目队伍素质等五个方面来改进编目工作,从而更好的为读者服务.     

基于二叉排序树的最佳适应算法

当前操作系统在管理内存时,常采用最佳适应算法对空闲内存块进行分配,但该算法存在效率不高、时空消耗大的缺点,对此提出基于二又排序树的最佳适应算法,改变原有的最佳适应算法中把所有空闲分区按容量大小顺序连接成空闲分区链的特点,而把所有空闲分区组建成一颗二叉排序树,进程发出请求时,根据二叉排序树的性质依次查找满足条件的空闲分区,并在分配后重组二叉排序树,保证二叉排序树的结构不被破坏,改善现有的最佳适应算法在查找过程中的效率问题.     

基于遍历序列重构二叉结构树的分析

针对如何由二叉树的遍历序列来唯一确定二叉树的问题,提出了用两种遍历序列唯一确定一棵二叉树的方法.理论分析证明,已知先序遍历和中序遍历或者已知后序遍历和中序遍历可以唯一确定一棵二叉树,但已知后序遍历和先序遍历就不能唯一确定了.文中还对用两种遍历序列唯一重构一棵二叉树算法进行了描述.     

Risk assessment based on fault tree analysis for damaged pipe repair during operation in petrochemical plant

In petrochemical plant, the in-operation repairing is usually a repairing strategy with pressured inoperation repairing for avoiding huge economic losses caused by unplanned shutdown when some slight local leakage happens in pipes. This paper studies the effects of repairing strategies on the failure probability of the pipe systems in process industries based on the time-average fault tree approach, especially the in-operation repairing strategies including pressured in-operation repairing activities. The fault tree model can predict the effect of different repairing plans on the pipe failure probability, which is significant to the optimization of the repairing plans. At first pipes are distinguished into four states in this model, i.e., successive state, flaw state, leakage state and failure state. Then the fault tree approach, which is usually applied in the studies of dynamic equipment, is adopted to model the pipe failure. Moreover, the effect of pressured in-operation repairing is also considered in the model. In addition, this paper proposes a series of time-average parameters of the fault tree model, all of which are used to calculate node parameters of the fault tree model. At last, a practical case is calculated based on the fault tree model in a repairing activity of pipe thinning.     

PERFORMING CALCULATION IN THE ART MARKET

The purpose of this article is to suggest a model of calculation in art markets based upon the work of Pierre Bourdieu and of actor-network theory. It will be argued that Bourdieu's concepts of capitals, economic, symbolic and cultural are useful for the specificity they lend to value making processes in the art market. However, actor-network theory's proposal of a distributed form of agency between humans and non-humans (e.g. calcualtion tools) is favoured here, posing a fundamental challenge to Bourdieu's notion of agency as resting solely at the hands of human agents. In order to understand the performance of calculation, this article explores the role of catalogues as an example of a market device in the Scottish auction market. It will be argued that the performativity of the catalogue cannot be fully understood without taking into account not only how it represents and enacts the value/s of aeshtetic objects, e.g. paintings, but also how this performance is mediated by its role as an aesthetic object.     

引进版西文图书的编目与管理

分析了引进版西文图书的编目和管理现状,提出规范编目和科学管理的实施建议.     

谈离子交换树脂的污染与处理

树脂被污染有两种情况,一种是树脂的中毒,另一种是树脂的老化.本文主要讲述阴离子交换树脂在不同水源情况下被污染的处理.     

中国秸秆优质化能源开发利用特征及影响因素

为考察中国秸秆优质化能源开发利用特征,本文在分析中国2009—2016年秸秆优质化能源产量年际变化、区域分布及结构特征的基础上,采用增强回归树方法定量分析了秸秆优质化能源开发利用水平的省际差异及其影响因素。结果表明：中国秸秆优质化能源产量从2009年的119.63万t标准煤上升到2016年的508.51万t标准煤,以生物气化和固化成型为主,其中生物气化比重逐渐下降,固化成型比重迅速上升。全国秸秆优质化能源开发利用水平均值从2009年的7.54 kg标准煤/hm ²上升到2016年的30.51 kg标准煤/hm ²。供给、需求和环境因素对其省际差异的贡献率分别为37.10%、35.60%和22.30%。秸秆优质化能源开发利用水平总体上随着粮食作物播种面积比例、农村居民人均纯收入、农村人均用电量和农村能源财政投入的上升而上升,随着人均耕地面积和机耕面积比例的上升而下降,随着饲草需求强度的上升呈先上升后下降趋势。当前中国秸秆优质化能源开发利用很大程度上依赖于农村经济发展水平的提高和行政力量的推动。西北、东北和华中等地区应加强对秸秆优质化能源开发利用的财政和科技支持力度。     

基于CNN-SVM 和转发树的微博事件情感分析

基于微博的情感分析近几年获得了广泛的关注,但是通常是对微博上的电影或者产品的评论。我们的研究目标是针对微博上的热点事件的分析,将这些事件的评论分为正向或者负向,将微博用户的评论进行分类有利于辨别公众对于这个事件的普遍看法。本文提出了一个基于卷积神经网络的混合模型：CNN-SVM,用于对事件的评论进行分类。其次,根据微博用户的转发行为,我们提出了一种新的数据结构——转发树,用以解决评论中的一些分类混乱情况。实验结果表明CNN-SVM 确实提高了情感分类的正确率,新提出的转发树结构在对真实世界的情感倾向性的逼近中也是十分有效的。