http://nopr.niscpr.res.in/handle/123456789/24163 2026-10-11T13:12:27Z http://nopr.niscpr.res.in/handle/123456789/24205 Title: Simple method for predicting detonation pressure of CHNO mixed explosives Authors: Keshavarz, M H; Oftadeh, M Abstract: A simple method is presented to estimate the detonation pressure of mixed CHNO explosives at various loading densities. This method is based upon a simple correlation in which the detonation pressure is interrelated by estimated gaseous detonation products and combustion temperature. Heat of formation calculated by semi-empirical PM3 procedure is used to calculate the combustion temperature. Calculated detonation pressure for known mixtures of CHNO explosives give results in better agreement with measured values than complicated BKW-EOS computer code. Page(s): 236-238 2003-06-01T00:00:00Z http://nopr.niscpr.res.in/handle/123456789/24204 Title: An indentation and stress analysis of WC/Fe-Mn hardmetals Authors: Hanyaloglu, S C; Aksakal, B; Sen, S Abstract: Vickers indentation has been applied experimentally to the produced hardmetal, WC-Fe 13.5 wt% Mn. It has been observed that the Palmqvist type cracks occur on the substrate hardmetal. The mechanical examination prove that the produced alloy possesses higher hardness, and unavoidably a bit lower fracture toughness than the equivalent of cobalt bonded grades. This could lead such hardmetal alloys to be used in mining and wear-resistant applications with better reliability. Three-dimensional stress analysis has been conducted using the finite element method on the basis of elastic failure due to brittleness of the material showing ignorable plastic deformation. Page(s): 229-235 2003-06-01T00:00:00Z http://nopr.niscpr.res.in/handle/123456789/24203 Title: Galvanostatic electrodeposition of Ti-(CdGa)Se films and their photoelectrochemical characterization Authors: Srivastava, M L; Mishra, Sameer S D Abstract: Titanium supported gallium containing CdSe films have been prepared using electrodeposition technique. The photoelectrochemical characterization of these Ti-(CdGa)Se films has been carried out on the basis of their photoelectroconvertibility and photoaction spectral studies. Current voltage behaviour of the electrodeposited films was also investigated to construct Tafel plots for the purpose of electrochemical corrosion. Page(s): 223-228 2003-06-01T00:00:00Z http://nopr.niscpr.res.in/handle/123456789/24202 Title: Behaviour of low heat sulphate resistant cement in aggressive media Authors: Singh, Manjit; Garg, Mridul Abstract: The low heat sulphate resistant (LHSR) cement has been produced by activation of granulated blast furnace slag with low temperature phase of gypsum, i.e .calcium sulphate hemihydrate (CaSO₄.1/2 H₂O) produced at 150^oC. The LHSR cement was tested and evaluated as per IS: 4031 - 1995 and the properties compared with ordinary portland cement (OPC). The LHSR cement on hydration produce ettringite, C-S-H and C₄AH₁₃ as the major hydraulic products. The suitability of LHSR cement was examined for its use in sulphate solutions such as Na₂SO₄.10H₂O, (NH₄)₂SO₄, MgSO₄ and in mixture of NaCl and Na₂SO₄.10H₂O. Data up to 90 days of curing in sulphate solution is reported. The results show that with curing, a fall in compressive strength of LHSR cement as well as OPC took place. However, the fall of strength was lower in LHSR cement than the OPC. The attainement of higher strength values in LHSR cement in sulphate solutions may be correlated with the formation of increased quantity of C-S-H and decrease in Ca(OH)₂ and ettringite. The LHSR cement may be used in construction work to obviate sulphate attack. Page(s): 219-222 2003-06-01T00:00:00Z