http://nopr.niscair.res.in/handle/123456789/12891 Search the Channel search http://nopr.niscair.res.in/simple-search http://nopr.niscair.res.in/handle/123456789/12900 Title: Rise in energy product of Sm-Co/Fe spring exchange magnetic bilayers with addition of Cr at interface <br/> <br/>Authors: Shahzad, Furrukh; Siddiqi, Saadat Anwar; Jing, Xu; Hong-liang, Bai; Min-jian, Tang <br/> <br/>Abstract: Sm-Co/Fe bilayers are deposited by DC and RF magnetron sputtering on 70 nm Cr buffered Si (100) substrate at an elevated temperature of 650°C. Thickness of Sm-Co and Fe is fixed as 20 nm and 10 nm, respectively. Magnetic behavior with very thin Cr layers (0.3-0.7 nm) at interface of Sm-Co and Fe is studied. All the samples showed strong exchange coupling and single phase hysteresis loops. The energy product (<i style="">BH</i>)_maxvalue is enhanced to 15% for 0.6 nm Cr layer as compared to the sample without Cr interlayer. <br/> <br/>Page(s): 329-331 http://nopr.niscair.res.in/handle/123456789/12899 Title: Simulation and control studies for FBTR steam water system <br/> <br/>Authors: Vaidyanathan, G <br/> <br/>Abstract: Fast breeder test reactor (FBTR)<b style=""> </b>of 50 MWt, 13.2 MWe is in operation at Kalpakkam, India. It has a full fledged steam water system with addition of a dump condenser (DC) to condense all the steam in the event of non availability of turbine generator (TG). For smooth changeover from the TG operation to DC operation, a control scheme was evolved. Towards this a computer code POWDYN is developed based on a one dimensional simulation model of the steam water system. Different control schemes are analyzed with the code and final scheme arrived at. This paper presents the details of FBTR steam water system; the simulation model used for control studies and predicted response of the steam water system to different transients. <br/> <br/>Page(s): 321-328 http://nopr.niscair.res.in/handle/123456789/12898 Title: Study of parabolic rate constant for coated AISI 430 steel with Mn₃O₄ and MnFe₂O₄spinels <br/> <br/>Authors: Ebrahimifar, Hadi; Zandrahimi, Morteza <br/> <br/>Abstract: The oxidation resistance of AISI 430 ferritic stainless steels which are used as interconnects in solid oxide fuel cells (SOFCs) for the intermediate temperature operation can be improved with a protective coating layer. In this study, the pack cementation method is employed to coat AISI 430 ferritic stainless steel. Isothermal oxidation, cyclic oxidation and oxidation at different temperatures (600-900°C) are applied to evaluate the parabolic rate constant. The coated samples demonstrated lower parabolic rate constant (<i style="">k</i>_p) in each test and it indicates that the coating layer has acted as a mass barrier against the outward diffusion of cations specially chromium. XRD analysis revealed that the formation of Mn₃O₄ and MnFe₂O₄spinels during oxidation caused to the improvement of the oxidation resistance. <br/> <br/>Page(s): 314-320 http://nopr.niscair.res.in/handle/123456789/12897 Title: Influence of the silicon on structure and properties of cast high speed steel weakly allied to the molybdenum <br/> <br/>Authors: Seddak, Aissa; Seddak, Mohamed <br/> <br/>Abstract: In spite of its bad plasticity and the increasing deficit of certain metals (W, Mo, V, Cr), the high speed steel has a great advantage, which is its tenacity. In recent years, investigations have been carried out to the development of new high speed steels without tungsten weakly allied to the molybdenum. The aim of this paper is to specify the influence of the silicon on high speed steel allied to the molybdenum . We studied the structure, the composition of phases, the hot hold and the chemical composition of the eutectic carbide Me₆C. We also studied the influence of the silicon in quantities of 0.8, 1.5, 2.5 and 3.5% on the composition of phases, the structure and properties of high speed steel without tungsten and with the molybdenum HS 0-5-1, directly to the as-cast condition, after tempering and annealing.   <br/> <br/>Page(s): 309-313