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Three-Dimensional Microstructural Modelling of Wear, Crack Initiation and Growth in Rail Steel
Fletcher, D.I.,Franklin, F.J.,Garnham, J.E.,Muyupa, E.,Papaelias, M.,Davis, C.L.,Kapoor, A.,Widiyarta, M.,Vasic, G. The Korean Society for Railway 2008 International Journal of Railway Vol.1 No.3
Rolling-sliding, cyclic contact of wheel and rail progressively alters the microstructure of the contacting steels, eventually leading to micro-scale crack initiation, wear and macro-scale crack growth in the railhead. Relating the microstructural changes to subsequent wear and cracking is being accomplished through modelling at three spatial scales: (i) bulk material (ii) multi-grain and (iii) sub-grain. The models incorporate detailed information from metallurgical examinations of used rails and tested rail material. The initial 2-dimensional models representing the rail material are being further developed into 3-dimensional models. Modelling is taking account of thermal effects, and traffic patterns to which the rails are exposed.
Karaulia, D.S.,Agrawal, Sanjay,Kapoor, Ravi Kant Korea Multimedia Society 2003 멀티미디어학회논문지 Vol.6 No.4
Developing tailor made Multimedia courseware ensuring effective implementation of instruction strategies is a challenge that manifests in myriad problems of software design and coding. In this paper an attempt has been made to analyse and identify coding and implementation problems, in the backdrop of using two different multimedia software development tools i.e. Visual Basic and Toolbook, which underpin the development and effectiveness of use of multimedia courseware. Solutions to such problems have been discussed in context of Tool book. The examples presented in this paper are based on the experience of designing and implementation of two large scale professional quality Multimedia courseware development projects.
Tariku Bayisa,Sakshi Bajhal,Anandhakumar Sundaramurthy,Ashish Kapoor,Kim Han Tan,Saidur Rahman,Neeraj K. Gupta,Gemechu D. Edossa 한국섬유공학회 2023 Fibers and polymers Vol.24 No.10
Antimicrobial properties of metal and metal oxide nanoparticles (NPs) and nanocomposites (NCPs) can be a promising solution to reducing microbe infections. The objective of the present work was to develop washable antibacterial cotton fabrics grafted with L-methionine (MetCot) and coordinately bind silver (Ag) NPs, particularly zinc oxide-silver (ZnO-Ag) NCPs, to exploit their potential synergistic antibacterial properties. MetCot + Ag and MetCot + ZnO-Ag fabrics were analyzed chemically and physically by different techniques. Functionalization of MetCot, in situ, by the NPs and NCPs did not change the cotton fiber structure. The synthesized Ag NPs and ZnO NPs of high purity with an average particle size of 30 and 10 nm, respectively, were uniformly distributed and bound to MetCot. However, functionalization changed MetCot's color to dark yellow–brown shades. Based on essential properties and comfort, the reduction of approximately 12% in vapor permeability and water absorbability, along with a slight decrease in tensile strength and elongation after functionalization of approximately 5-12% for MetCot + Ag and MetCot + ZnO-Ag, should be within the industry's acceptable criteria. MetCot + Ag and MetCot + ZnO-Ag showed excellent antibacterial activity against E. coli and S. aureus after 50 wash cycles. A synergistic effect was observed with MetCot + ZnO-Ag over MetCot + Ag by approximately 7-13%. The amount of Ag NPs and ZnO NPs retained after 50 wash cycles ranged between 80% and 86%. This indicated strong binding to the fabrics. MetCot + Ag and MetCot + ZnO-Ag are biocompatible, as demonstrated by the indirect cytotoxicity assay using 3T3 fibroblast cells with overall cell viability of 95% after 1 and 7 days of exposure.
Security, Vulnerability and Protection of Vehicular On-board Diagnostics
Aastha Yadav,Gaurav Bose,Radhika Bhange,Karan Kapoor,N.Ch.S.N Iyengar,Ronnie D. Caytiles 보안공학연구지원센터 2016 International Journal of Security and Its Applicat Vol.10 No.4
Recent studies have shown that ‘’hacktivists’’ can mount serious attacks on automobiles. The automotive On-Board Diagnostic (OBD) interface enables an efficient way to access information of the in-vehicle electronic system and leaves way for unauthorized access by an intruder. We discover that remote exploitation is feasible via a broad range of attack points such as mechanic tools, CD players, Bluetooth and Tire Pressure Monitoring System. Wireless communications channels allow long distance vehicle control. Finally, the paper discusses the drawbacks of Seed-Key Mechanism to authenticate and provide an extra layer of authentication to help build a safer automotive ecosystem.