Estimations of Electrical Conductivities in Molten Slag Systems

In the present paper, the electrical conductivities of molten silicates systems, CaO‐MgO‐SiO₂, Na₂O‐MgO‐SiO₂, CaO‐FeO‐SiO₂ and CaO‐MgO‐MnO‐SiO₂ (SiO₂ = 45wt %) were estimated by the mass triangle method developed earlier by Chou. The computed results are compared with other approaches found in the literature. The predictions show satisfactory agreement with experimental results reported in the literature. A correlation was also made between the cation‐oxygen ion attraction parameter I and the electrical conductivities of slags. It was found that the electrical conductivity varies linearly with I when the content of transition metallic ions is less than 0.2 mole fraction. Beyond this, the effect of electronic conduction is expected to dominate. On the basis of the present approach, the electrical conductivities of higher order systems can be estimated. The approach suggested in the present paper offers a powerful tool to design slags for applications in metallurgical processes.     

Progressive cutting tool wear detection from machined surface images using Voronoi tessellation method

Tool condition monitoring by machine vision approach has been gaining popularity day by day since it is a low cost and flexible method. In this paper, a tool condition monitoring technique by analysing turned surface images has been presented. The aim of this work is to apply an image texture analysis technique on turned surface images for quantitative assessment of cutting tool flank wear, progressively. A novel method by the concept of Voronoi tessellation has been applied in this study to analyse the surface texture of machined surface after the creation of Voronoi diagram. Two texture features, namely, number of polygons with zero cross moment and total void area of Voronoi diagram of machined surface images have been extracted. A correlation study between measured flank wear and extracted texture features has been done for depicting the tool flank wear. It has been found that number of polygons with zero cross moment has better linear relationship with tool flank wear than that of total void area.     

型钢混凝土三角桁架在穹幕影院中的应用

以山西省地质博物馆工程为例,介绍了型钢混凝土三角桁架在穹幕影院中的应用,通过合理的力学简化,把球形穹幕影院荷载简化,计算得到三角桁架内力,从而论证了受力复杂的支撑结构,型钢混凝土结构形式能很好满足结构的承载力和正常使用状态。     

三角桁架双导梁架桥机工法

结合忻阜高速公路S合同段25m预应力混凝土连续箱梁的架设，简要介绍了三角桁架双导梁架桥机的构造、拼装、调试和混凝土梁架设的施工方法，并提出了架桥的安全防范措施，为类似工程施工积累了宝贵经验。     

三边交会简易平差法

本文论述从三个已知点向一个待定点用测边交会的方法确定其点位,并能估计其精度的简易平差法.     

杨辉三角形与热力学自由能

本文在L. E.雷克断言的基础上,给出了求得一个热力学体系的全部自由能总数的规则,n次二项式展开后各项系数(即杨辉三角形)的和,就是一个热力学系统的所有可能的自由能的总数目,n是体系的共轭变量的成对数目。     

Efficient Generation of Conforming Voronoi Polygonal Surface Mesh

A novel construction algorithm is presented to generate a conforming Voronoi mesh for any planar straight line graph (PSLG). It is also extended to tesselate multiple-intersected PSLGs. All the algorithms are guaranteed to converge. Examples are given to illustrate its efficiency.     

三角模糊AHP在供应商选择中的应用

基于AHP算法和三角模糊算法解决了供应商的选择问题，开发了供应商评估程序，以实例证明了本算法能有效确定最佳的供应商。     

基于人工神经网络大气折光系数实时改正方法

根据大气折光的变化特点，导出了大气折光系数中误差的计算公式，分析了影响大气折光系数测定精度的主要因素。结合南里渡特大桥施工监测监控实例，以地形、时段、气温和气压为网络输入，大气折光系数为网络输出，建立了大气折光系数的人工神经网络模型，实现大气折光系数的实时改正。实施有效的大气折光系数实时改正，成为提高全站仪精密三角高程精度的关键。     

改进的Allman无零能模式平面三角形单元

基于原始的带有旋转自由度的Allman单元,从转动分量定义出发,对原始的Allman单元泛函位能Ⅱp进行了一些修正,推导得到了一个新的单元.该单元成功地消除了Allman单元的主要缺陷--多余零能模式,同时保持了该单元的优点:列式简洁、精度高,给出的算例证实了改进单元的良好特性.