发掘论坛人际关系圈模型

探讨论坛人际关系圈的发掘。从帖子关联关系出发,运用数据挖掘中的灰色关联分析法对论坛人际关系圈做综合评价。建立旨在用灰色关联的数据挖掘方法建立满足最小支持度阈值和最小信任度阈值的关联规则的模型。为论坛的发展、经营提供数据支持。     

基于GM(1,1)模型的东辛采油厂产量预测研究

本文介绍了GM(1,1)模型的建模过程,考虑油田产量数据较少的现状,将其视为灰色系统,并利用灰色系统GM(1,1)模型对油田石油产量进行了预测。经实证,模型的精度符合要求,预测结果可以为采油厂提供决策依据。     

统计信息的数据挖掘与可视化分析系统

将数据挖掘、Web报表可视化技术、联机分析处理技术、内容管理技术集成,构造一个应用于统计部门的统计信息的数据挖掘与可视化分析系统(SDVS)。并技术实现了各模块的主要功能,验证了SDVS的可行性。     

数据挖掘在医疗器械人因事件分析中的应用

将数据挖掘技术应用于医疗器械人因事件的灰色关联分析中,通过分析现有医疗器械不良事件汇报系统中的数据,获取不同类型人误对人因事件的关联影响.提出了应用数据挖掘的具体分析和操作流程,同时以医用泵的人因事件分析为实例,定量分析了医用泵人因事件的原因因素和人误,以及人因事件后果和人误之间的关联程度,以便对医疗器械人因事件的整个发展过程进行定量化的分析.     

基于组合权重的灰色关联理想解法及其应用

引入灰色系统理论,对传统理想解法(TOPSIS)进行了拓展,提出了一种基于组合权重的灰色关联理想解法(GC-TOPSIS).利用AHP和熵值法对决策指标进行组合赋权,依据灰色关联分析理论,以灰色关联度为决策单元构造GC-TOPSIS模型,最后通过一个供应商选择的实例验证了方法的有效性和可行性.     

数据挖掘技术在校园卡消费系统中的研究

本文基于OLAP技术和数据挖掘技术,构建了校园卡消费系统数据挖掘模型,提出了一种WEB下基于OLAP和数据挖掘技术的校园卡消费系统挖掘算法,并分析了数据挖掘在校园卡消费系统中实现的过程。     

基于数据挖掘技术的入侵检测系统

详细论述了在入侵检测系统中数据挖掘技术的应用，对现有的应用于入侵检测的数据挖掘技术如关联规则、聚类分析、特征分类等进行了分析和综合。结合元挖掘等新概念，本文给出了一个应用数据挖掘技术的入侵检测系统IDSDM框架。该框架具有良好的智能性和自适应性。     

基于云计算平台的风电场SCADA系统的设计与应用

针对目前风电场积累的海量多源异构的大数据,借助云计算平台架构灵活多变、数据并行处理的优势,设计了基于云计算平台的风电场数据采集与监控(SCADA)系统。在该系统的云计算平台上采用智能化数据挖掘算法,完成了风机数据的远程采集、智能分析、故障预判。最后选取反映风电场性能的功率和转子转速数据,以自适应权重(AFW)的K-means算法和最小二乘支持向量机两种典型的数据挖掘算法为例,对数据进行了聚类分析和回归分析,验证了系统的可行性。     

测量仪器校准间隔的动态灰色线性回归预测

根据测量仪器的实际状态进行校准间隔的预测,可有效地避免不足校准和过剩校准。该文分析了历史校准数据的特征,对于既含有线性因素又含有指数因素的历史校准数据序列,建立动态灰色线性回归预测模型,预测测量仪器的校准间隔。动态灰色线性回归模型有机地将灰色GM(1,1)模型和线性模型组合起来,通过新老数据的新陈代谢,更加真实地反映系统的特征。通过实验对预测模型进行验证,结果表明:动态灰色线性回归模型的拟合与预测精度高于单纯的灰色GM(1,1)模型及新陈代谢GM(1,1)模型。     

基于灰色关键链的项目进度管理方法及应用

针对项目或者任务完成时间具有外延确定而内涵不确定的特点,应用灰色系统思想提出了基于灰色关键链的项目进度管理方法.设计的灰色关键链方法通过改进关键链中缓冲时间的取法,以设置合理的输送缓冲时间(Feeding Buffer)及项目缓冲时间(Project Buffer).最后,通过实例给出了该方法的应用步骤,并将计划评审技术、关键链与灰色关键链进行了比较.     

The Research of Anti-Wear Properties of Organomolybdenum Compounds in the Engine Oils

A four-ball tester was used to evaluate the anti-wear performance of three kinds of organomolybdemun compounds in the engine oils, i. e., molybdenum dialkyldithiophosphate (MoDDP), molybdenum dialkyldithiocarbamate ( MoDTC), and sulphur and phosphorus freeorganomolybdeum (Molybdate). The results indicate that a low concentration of MoDDP doesn' t improve the anti-wear properties of the commercial engine oils, but a high concentration of MoDDP can obviously improve the anti-wear properties and the load-carrying capacity of the engine oils. MoDTC doesn' t improve the antiwear properties of the engine oils, but worsens the anti-wear properties of the oils. Signifi can timprove ment of frictional and wear characteristics is obtained with Molybdate added in the commercial engine oils and the formulated oils.     

Certification Becomes Important for the I Quality; and Safety Supervision of the Chinese Liquor Sector

The end of 2007, over 200 unit products of more than 80 Chinese firms have passed the quality grade certification for liquor products. These products involve distilled spirits, beer, wine, yellow wine, fruit syrup wine and others, and cover over 80% of the national top-branded liquor products.……     

Deposition and Coating Properties on CVD Tungsten

Surface characterization and microstructure studies are performed on chemical vapor deposited (CVD) tungsten coating. There is about 2 μm thickness diffusion layer of tungsten in the molybdenum substrate. The thermal shock test shows tungsten coating has good adhesion with molybdenum substrate, but the elements of oxygen and carbon in the tungsten coating have the bad affection to the adhesion. The result of high-temperature diffusion experiment is the diffusion rate from molybdenum substrate to tungsten coating is faster.     

Analysis of marine hydrobiont lipid extracts as possible cryoprotective agents

We studied a combined effect of the cryoprotectants both of lipid and carbohydrate origin at the presence of DMSO or without it on cell viability and the RNA synthesis in the embryonic mollusc and echinoderm cell cultures obtained at different developmental stages. Cryoprotective properties of exogenous lipids correlated with their thermotropic behavior. Lipid extracts from marine hydrobiontes, which thermal transitions are characterized by relatively small part of calorimetric thermogram area lying at temperatures above 0 °C (6–18%), were found to possess a considerable cryoprotective activity. The results are discussed in relation to the prediction of the cryoprotective activity of lipid extracts for marine animal cells. In addition, it was found that marine invertebrate cells can be cryopreserved without DMSO at the presence of trehalose and lipid extracts of some marine hydrobiontes.     

Low-Temperature Properties of Silver

Pure silver is used extensively in the preparation of high-temperature superconductor wires, tapes, films, and other configurations in which the silver not only shields the superconducting material from the surrounding materials, but also provides a degree of flexibility and strain relief, as well as stabilization and low-resistance electrical contact. Silver is relatively expensive, but at this stage of superconductor development, its unique combination of properties seems to offer the only reasonable means of achieving usable lengths of conductor. In this role, the low-temperature physical (electrical, thermal, magnetic, optical) and mechanical properties of the silver all become important. Here we present a collection of properties data extracted from the cryogenic literature and, to the extent possible, selected for reliability.     

Early ironwork in Biscay: Survey,excavation, experimentation and materials characterization. An integral study of the mountainside ironworks (ferrerías de monte or “haizeolak”)

ABSTRACT

The production of iron in Biscay (Basque Country, Spain) has been a hallmark of this territory of the North of the Iberian Peninsula throughout its history. The Archaeology team of the Basque Country Mining Museum has spent 13 years, so far, studying the origins of this activity through the evidences left at the old pre-hydraulic iron production workshops known as mountainside ironworks (ferrerías de monte) or haizeolak. It has catalogued 170 archaeometallurgical sites of this type in Biscay, and the archeological excavation of some of them has led to the knowledge of the different stages of the production process that took place in these workshops. The team has also experimentally reproduced the work carried out in a mountainside ironworks from the High Middle Ages, and it has currently started the characterization process of this type of activity through the study of the collected materials.     

Mechanism Study on the Wear of CrAlTiN Coated High-Speed Steel Twist Drills Under Dry Cutting Conditions

As demands about environment protection are growing up, dry cutting technology is getting more and more concerns from all over the world. Main works performed here are study on dry cutting performances and wear mechanisms of M2high-speed steel (HSS) twist drills with CrAlTiN multicomponent coatings, which was deposited using magnetron sputter ion plating system, in drilling 45 and 30CrMnSiA steel, and their comparisons to those in drilling the same steel but using monolayer CrN and commercial TiN coated drills. Drilling performances of drills are evaluated mainly through the measurements of width on outer corner flank land and the cutting forces. Results show that performances of CrAlTiN coated drills are better than those of monolayer CrN and TiN coated drills. In drilling 45 and 30CrMnSiA steel, the average tool life of the CrAlTiN coated drills are 17.2 and 11.8 times higher than those of the uncoated drills. Observing wear of the drill with scanning electronic microscope, results show that there is no crack or spallation of the CrAlTiN coatings in wear zones. Main mechanism of the wear here is adhesion.     

Study on Bond Ability of Arc-Spraying Coatings with Different Surface Pretreatment on Cast-Iron

Arc spraying coatings are widely used in various applications, but uncommon in cast iron substrate. Different surface pretreatment technology is tested on substrates of gray cast iron. Surface roughness and residual stress were measured by TR200 and X-ray diffraction analyzer. Influence of different surface pretreatment methods ( dry blasting and fusebond) on roughness and residual stress was analyzed. The arc-sprayed coatings of wire 3Cr13 (φ2mm) on gray cast iron substrate is studied. The microstructure and interface of bonding layer were observed by SEM. The bond strength was taken by tensile test. Results show that bond strength with grit blasting is higher than fuse-bond; it is feasible to make wire 3Cr13 coating with arc spraying on cast iron substrate roughened by grit blasting.     

Structural Characteristics of TiO2 Ceramic Coating by Micro-Plasma Oxidation

TiO2 ceramic coatings with thickness of 20 μm were formed on the surface of pure titanium by micro-plasma oxidation. Their micro-structures were investigated by by using X-ray diffraction and their surface images were detected by using scan electronic microscope. There were three kinds of TiO2 coatings, pure anatase type TiO2 phase, mixed phases consisted of rutile type TiO2 phase and anatase type TiO2 phase, pure rutile type TiO2 phase. The coating surface with the pure anatase type TiO2 phase is rough, while the coating surface with the pure rutile type TiO2phase is smooth. The upper coating surface with the mixed type TiO2 phases is anatase type TiO2 structure and the subsurface of the TiO2 coating is rutile type TiO2structure.     

Evaluation of fatigue life of steel using steel grain size

The insightful discussion of the relationship between the construction of metallographic and fatigue life and proposition of mathematical relationships describing this relationship was conducted in the paper. This paper presents a method for estimating the fatigue life, based on the construction of the microstructural material taking into account the grain size and the participation of ferrite and pearlite phase.