海底沉积物剪切强度的试验研究

通过在船上现场测试,对勘探海域沉积物剪切强度进行了测试和分析.并从力学特征等方面对海底沉积物进行了综合工程地质特性研究,发现测试区域剪切强度特征随含水量的变化而变化.当含水量较高时,具有抗剪切强度小的力学特性.同时结果也表明沉积物剪切强度随深度加大而增大,到一定深度后强度趋于平稳.不同站位的沉积物由于其类型不同其剪切强度随深度的变化也不一样,有的甚至还有较大的差别.图2,表1,参9.     

对频集发现算法Apriori的研究

在分析已有关联规则和挖掘算法的基础上，对频集发现算法Apriori进行了研究，详细地论述了该算法的实现过程及所涉及的诸多问题，并对该算法的缺点及如何优化进行了较为深入的讨论．     

矿区消防系统设计的体会

介绍了矿区消防系统的特点和消防系统的选择，结合矿区消防设计的实例，说明了矿区消防设计中应注意的几个问题。     

矿用空压机吸气管道内气柱共振与管道安装长度的关系

本文计算了矿用空压机吸气管道内的气柱固有频率，阐述了吸气管道安装长度与气柱共振的关系，并得出了防止发生管道共振的吸气管道最佳安装长度     

用模糊数学预测煤层底板的突水

本文运用模糊数学综合评判原理,依据地质及开采条件,得出各影响因素对于突水的综合隶属函数图像,并利用贴近度与择近原则进行识别,从而对煤层底板突水的危险性作出预测。并对实例进行了模糊分析,分析结果与实际情况相符。     

Direct assignment of positional isomers by mass spectrometry: ortho,meta and para acyl and amidyl anilines and phenols and derivatives

A direct MS/MS method for the ortho, meta or para configuration assignment of any single molecule that forms reference ions upon ionization and dissociation is demonstrated. Gas-phase structure diagnostic ion–molecule reactions with acetonitrile are shown to distinguish the isomeric 2-, 3- and 4-hydroxybenzoyl cations and the 2- from the 3- and 4-aminobenzoyl cations. These reference ions, which display indistinguishable 15 eV collision-induced dissociation product ion mass spectra, react with acetonitrile to yield characteristic ratios of product ions, most particularly for the 2-isomers. The reactivity of the 2-benzoyl cations is the most characteristic since the ortho configuration allows for [4⁺ + 2] polar cycloaddition that yields relatively stable heterocycles in N-protonated forms. Distinction of the reference isomeric 2-, 3- and 4-hydroxy- and aminobenzoyl cations permits, therefore, partially or completely, direct ‘MS-only’ positional assignment of either ortho, meta or para configuration for any single molecule that forms such reference ions upon ionization and dissociation. This “class-universal” method for direct MS assignment of a single positional isomer should therefore be applicable to many members of the homologous series of isomeric ortho, meta and para acyl and amidyl anilines and phenols and derivatives. Such molecules dissociate, or are likely to dissociate, after or during ionization processes to form the reference and structurally diagnostic ortho, meta or para hydroxy- or aminobenzoyl cations. Copyright © 2004 John Wiley & Sons, Ltd.     

基于XML的旅游信息系统的电子数据交换研究

研究了一种将数据结构和数据格式与文件的生成过程相分离的方法.将这种方法转化为一种以XML文档类型定义(DTDs)所代表的元数据结构.如果要改变数据交换的规范,只需要更新XMLDTDs中相应的元数据即可,而数据交换处理机的实现保持不变,从而使得管理和维护的工作量大大减小.     

数据挖掘技术在《面向对象程序设计》课分析中的应用

文章利用了数据挖掘技术从海量数据中获取相关知识的能力,针对传统教育统计方法的弱点,对高校计算机课程《面向对象程序设计》这门课的考试成绩进行分类和预测,从而找出该门课程学生在学习中的隐含信息。     

Integration and dimensional modeling approaches for complex data warehousing

With the broad development of the World Wide Web, various kinds of heterogeneous data (including multimedia data) are now available to decision support tasks. A data warehousing approach is often adopted to prepare data for relevant analysis. Data integration and dimensional modeling indeed allow the creation of appropriate analysis contexts. However, the existing data warehousing tools are well-suited to classical, numerical data. They cannot handle complex data. In our approach, we adapt the three main phases of the data warehousing process to complex data. In this paper, we particularly focus on two main steps in complex data warehousing. The first step is data integration. We define a generic UML model that helps representing a wide range of complex data, including their possible semantic properties. Complex data are then stored in XML documents generated by a piece of software we designed. The second important phase we address is the preparation of data for dimensional modeling. We propose an approach that exploits data mining techniques to assist users in building relevant dimensional models.     

电子政务决策支持系统的设计与实现

随着通信、互联网技术和计算机技术的发展，电子政务越来越受到人们的关注，而数据仓库的广泛应用，使基于数据仓库的决策支持系统得到了很大的发展．构造基于java分布式技术的电子政务决策支持系统移植性强，基于浏览器的客户端界面友好，使用方便、简洁，系统扩展性强。