http://nopr.niscair.res.in/handle/123456789/8394 Search the Channel search http://nopr.niscair.res.in/simple-search http://nopr.niscair.res.in/handle/123456789/8427 Title: Correlations for predicting detonation temperature of pure and mixed CNO and CHNO explosives <br/> <br/>Authors: Keshavarz, M H <br/> <br/>Abstract: In this paper, detonation temperature of CNO and CHNO explosives is evaluated by the base of atomic composition and heat of formation. It is shown here how only atomic composition and condensed phase heat of formation of CNO and CHNO explosives are sufficient for reliable prediction of detonation temperature as compared to complicated computer codes. New correlations are introduced so that they can easily be applied for determining detonation temperature via specified different pathways of decomposition of explosives. Calculated detonation temperatures by this procedure for both pure and explosive formulations show good agreement with respect to measured and the BKWS-EOS predictions of detonation temperatures. <br/> <br/>Page(s): 158-164 http://nopr.niscair.res.in/handle/123456789/8426 Title: Preparation of ferrites from the combustion of metal nitrate-oxalyl dihydrazide solutions <br/> <br/>Authors: Randhawa, B S; Dosanjh, H S; Kaur, Manpreet <br/> <br/>Abstract: Spinel ferrites, MFe₂O₄ (M= Co, Ni, Cu, Zn) have been prepared by a redox chemical reaction between aqueous solutions of metal nitrates, ferric nitrate and oxalyl dihydrazide (ODH). On rapid heating the reaction mixture undergoes an abrupt exothermic redox chemical reaction that facilitates atomic scale mixing of the cations. This leads to the formation of stoichiometrically pure and single-phase nanoparticle ferrites at comparatively reduced temperature (400^oC) and in less time than possible by the conventional ceramic method. The final thermolysis products (ferrites) have been characterized by various physico-chemical techniques, i.e., XRD, IR, SEM and magnetic studies (saturation magnetization and Curie temperature). <br/> <br/>Page(s): 151-154 http://nopr.niscair.res.in/handle/123456789/8425 Title: Planar parallel manipulators: Structure based selection from the viewpoint of workspace <br/> <br/>Authors: Srinath, A; Rao, A C <br/> <br/>Abstract: It is known that serial manipulators generate greater workspace. Recent trend is to use planar parallel manipulators where heavy loads are to be handled. There are a large number of planar parallel structures available with the same number of links and degree of freedom (d.o.f.). However, there is no quantitative measure to estimate the parallelism present in a chain. Mathematical measures are proposed to estimate parallelism that exists in a chain, since it influences the rigidity and workspace. Also, formulae are suggested to get insight of the workspace generated, i.e., well conditioned or not. <br/> <br/>Page(s): 104-110 http://nopr.niscair.res.in/handle/123456789/8424 Title: Formability of HSLA and EDDQ steels of tube products of India <br/> <br/>Authors: Narayanasamy, R; Narayanan, C Sathiya <br/> <br/>Abstract: In this work, the formability of HSLA (micro alloyed steel of 1.6 mm thickness) and EDDQ (1.2 mm thickness) steels have been studied and the suitability of HSLA and EDDQ steels for forming applications have been examined. The experimental work on microstructural aspects, tensile properties and formability parameters were carried out for both the steel sheet metals. The forming limit diagram for EDDQ and HSLA steels have been experimentally evaluated. A detailed analysis of the strain distribution profiles obtained from experiment has been attempted. The fracture surfaces of the formed samples have been observed using scanning electron microscopy with a view to obtain a correlation between fracture behaviour and formability of the sheet metals. The EDDQ steel has been found to possess good drawability and stretchability, whereas the HSLA steel has been found to possess limited drawability and stretchability. <br/> <br/>Page(s): 141-150