http://localhost:8080/xmlui/handle/123456789/18 Research Papers published in journals in year 2007 2026-04-08T10:28:26Z http://localhost:8080/xmlui/handle/123456789/2680 LUMINESCENCE STUDIES OF RARE EARTH DOPED CALCIUM ALUMINATE PHOSPHORS MADHUKUMAR, K; RAJENDRA BABU, K; AJITH PRASAD, K C; JAMES, J; ELIAS, T S; PADMANABHAN, V; NAIR, C M K Photoluminescence (PL) and Thermoluminescence (TL) properties of Cerium (Ce3+) and Terbium (Tb3+) singly doped and multidoped monocalcium aluminate phosphors are studied. The suitability of monocalcium aluminate material as a luminescent host is analyzed. The nature of trap centers and the possibility of energy transfer between the dopant ions are discussed. The suitability of the material for radiation dosimetry application is also studied 2007-01-01T00:00:00Z http://localhost:8080/xmlui/handle/123456789/2672 Flux Pinning Properties of Magnesium Diboride Added (Bi,Pb)-2212 Superconductors Vinod, K; Abhilash Kumar, R G; Biju, A; Sarun, P M; Syamaprasad, U Microstructure and flux pinning properties of polycrystalline (Bi,Pb)-2212 system with varying levels (0–0.2 wt.%) of MgB2 was studied. Phase analysis, microstructural investigation and superconducting characterization were performed to evaluate the performance of the samples. The addition brought about novel features in the layered microstructure of (Bi,Pb)-2212 for critically added samples which resulted in an unusual enhancement of the flux pinning strength of the system. The self field JC (304 A/cm2) of 0.1 wt.% MgB2 added sample is more than 50% that of undoped sample (201 A/cm2) and in 0.8 T field, it is about 50 times that of pure sample at 64 K. 2007-07-31T00:00:00Z http://localhost:8080/xmlui/handle/123456789/2671 Effect of Mg on the Fracture Characteristics of Cast Al–7Si–Mg Alloys Thirugnanam, A; Sukumaran, K; Pillai, U T s; Raghukandan, K; Pai, B C The fracture behavior of Al–7Si–Mg cast alloys mainly depends on the size and shape of eutectic silicon particles and iron-rich intermetallics. These can be altered by many ways such as, chemical modification, cooling rate, magnesium content and iron-rich intermetallics. Magnesium increases the matrix strength, but decreases the ductility. Further, cast Al–7Si–Mg alloys can be strengthened by heat treatment processes to attain desirable mechanical properties. Crack tortuosity, crack branching factor (CBF) and tendency of crack propagation through eutectic regions are quantified in order to study the formation and growth of fatigue crack. The crack propagation in the Al–Si–Mg alloys depends on the morphology of silicon particles, cell size and Mg content. The fracture toughness values measured are found to decrease with increase in magnesium content at the optimized T-6 heat treated condition 2007-02-15T00:00:00Z http://localhost:8080/xmlui/handle/123456789/2670 A FACILE SYNTHESIS OF THIAAZA- AND THIADIAZA-FLUORENE DERIVATIVES INVOLVING BENZOTHIAZOLE-DMAD ZWITTERION WITH ARYLIDENEMALONONITRILES AND N-TOSYLIMINES Vijay Nair; Rema Devi, B; Abhilash, N P; Rony Rajan Paul An efficient protocol for the one-pot synthesis of thiaazafluorene and thiadiazafluorene derivatives are described 2007-10-02T00:00:00Z