Materials and Energy Research CenterInternational Journal of Engineering1025-24958319950801Intelligent Vehicle Highway Systems (Ivhs) Issues and Recommendations12113271127ENR. S. Nanda, Research Scientist Transmode Inc.Journal Article19700101Intelligent Vehicle Highway Systems (IVHS) is the integration of various pieces of information and computer technologies to the transportation elements in order to obtain a more productive transportation system. The five major components of IVHS are the Advanced Traffic Management Systems (ATMS), Advanced Vehicle Control Systems (AVCS), and Advanced Public Transportation systems (APTS). This paper examines the different macro level issues such as socioeconomic, legislative, financial, environmental and international as well as micro level issues such as insurance and liability related to IVHS. It then identifies the obstacles that potentially hinder the implementation and growth of IVHS. After examining the implications of these issues it attempts to make suitable recommendations to help resolve different IVHS issues. The issues concerning the applicability of IVHS in developing countries are also examined in light of the current situation and suggestions on the applicability of specific technology areas are included.Materials and Energy Research CenterInternational Journal of Engineering1025-24958319950801Interactive Analysis of Space Frame Raft Soil System13314671128ENJ. NoorzaieCivil Engineering, university putra MalaysiaJournal Article19700101This study presents a new approach for physical and material modeling of space frame-raft-soil system. The physical modeling consists of a modified Thimoshenko beam bending element with six degrees of freedom per node to model the beams and columns of the superstructure, a modified Mindlin's plate bending element with five degrees of freedom per node to represent the structural slabs and raft, and the coupled finite-infinite elements with three degrees of freedom per node to model the soil media. The constitutive modeling involves the use of the hyperbolic model to account for the soil nonlinearity. The applicability of the proposed physical model is demonstrated by analyzing a four storey, five bay by three bay space frame. Morever, an attempt has been made to compare the linear and nonlinear interactive behavior of the space frame-raft-soil system.Materials and Energy Research CenterInternational Journal of Engineering1025-24958319950801Effects of Tungsten on the Pearlite Reaction in a Eutectoid Steel14715871129ENJ. AghazadehMining & Metallurgical Eng., Amirkabir University of TechnologyJournal Article19700101The effect of an addition of 0.37 Wt % Won the overall transformation rate of the austenitepearlite reaction in a eutectoid steel is examined. Pearlite growth rates and interlamerllar spacing are measured as a function of transformation temperatures. Tungesten raises the Ael temperature, for most transformation temperatures, decreases the overall reaction rate, the growth rate and the interlamellar spacing. Partitioning studies carried out using analytical electron microscope showed that, tungesten partitioned preferentially to cementite at temperatures down to 668?°C.Materials and Energy Research CenterInternational Journal of Engineering1025-24958319950801Surface Hardness Measurment and Microstructural Characterisation of Steel by X-Ray Diffraction Profile Analysis15916871130ENG. H. FarrahiSchool of Mechanical Engineering, Sharif University of Technologyhttps://orcid.org/00J.L. Lebrun, LM3, URA CNRS 1219, ENSAMJournal Article19700101An X-ray diffraction line will broaden considerably when steels change into martensitic structure on quenching. The results presented in this paper show that X-ray diffraction technique can be employed for a rapid and nondestructive measurement of hardness of hardened steel. Measurement on various quenched and tempered steels showed that the breadth of its diffraction peak increased with increasing hardness. Some empirical equations are derived to correlate the width of the diffraction line with the hardness. The diffraction profile analysis can offer good indication about the material's characteristics and the microstructural evolution caused by heat treatment or by mechanical loading.Materials and Energy Research CenterInternational Journal of Engineering1025-24958319950801Modified Enthalpy Method Applied to Laser Annealing of Semi Conductor Films16917971131ENC. P. GrigoropoulosMechanical Engineering, University of CaliforniaAA RostamiMazandaran, chemistryJournal Article19700101The rapid melting of silicon film due to the absorption of a CW laser beam radiation is studied. The silicon film melting and recrystallization is mainly controlled by the temperature distribution in the semiconductor. The enthalpy technique for the solution of phase change problems is used in an explicit finite difference form to calculate the transient temperature distribution in the silicon film and the substrate and the growth rates of the melt pool. The technique is modified so that it is not necessary to assign a constant temperature, Tm, to the mesh element that contains the melt front. Calculations are carried out for a range of laser beam parameters and material translational speeds. The results for the melt pool size are compared with the experimental data and reasonable agreement is obtained.