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- 저자 : P. Vani (검색결과 2 건)
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Effect of rare earth dopants on the radiation shielding properties of barium tellurite glasses
P. Vani,G. Vinitha,M.I. Sayyed,Maha M. AlShammari,N. Manikandan 한국원자력학회 2021 Nuclear Engineering and Technology Vol.53 No.12
Rare earth doped barium tellurite glasses were synthesised and explored for their radiation shieldingapplications. All the samples showed good thermal stability with values varying between 101 C and135 C based on dopants. Structural properties showed the dominance of matrix elements compared torare earth dopants in forming the bridging and non-bridging atoms in the network. Bandgap valuesvaried between 3.30 and 4.05 eV which was found to be monotonic with respective rare earth dopantsindicating their modification effect in the network. Various radiation shielding parameters like linearattenuation coefficient, mean free path and half value layer were calculated and each showed the effectof doping. For all samples, LAC values decreased with increase in energy and is attributed to photoelectricmechanism. Thulium doped glasses showed the highest value of 1.18 cm1 at 0.245 MeV for 2 mol.%doping, which decreased in the order of erbium, holmium and the base barium tellurite glass, while halfvalue layer and mean free paths showed an opposite trend with least value for 2 mol.% thulium indicating that thulium doped samples are better attenuators compared to undoped and other rare earthdoped samples. Studies indicate an increased level of thulium doping in barium tellurite glasses can leadto efficient shielding materials for high energy radiation.
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Murthy, Indu K.,Bhat, Savithri,Sathyanarayan, Vani,Patgar, Sridhar,M., Beerappa,Bhat, P.R.,Bhat, D.M.,Gopalakrishnan, Ranjith,Jayaraman, Mathangi,Munsi, Madhushree,N.H., Ravindranath,M.A., Khalid,M., Institute of Forest Science 2014 Journal of Forest Science Vol.30 No.2
The tropical wet evergreen, tropical semi evergreen and moist deciduous forest types are projected to be impacted by climate change. In the Western Ghats region, a biodiversity hotspot, evergreen forests including semi evergreen account for 30% of the forest area and according to climate change impact model projections, nearly a third of these forest types are likely to undergo vegetation type change. Similarly, tropical moist deciduous forests which account for about 28% of the forest area are likely to experience change in about 20% of the area. Thus climate change could adversely impact forest biodiversity and product flow to the forest dependent households and communities in Uttara Kannada district of the Western Ghats. This study analyses the distribution of non-timber forest product yielding tree species through a network of twelve 1-ha permanent plots established in the district. Further, the extent of dependence of communities on forests is ascertained through questionnaire surveys. On an average 21% and 28% of the tree species in evergreen and deciduous forest types, respectively are, non-timber forest product yielding tree species, indicating potential high levels of supply of products to communities. Community dependence on non-timber forest products is significant, and it contributes to Rs. 1199 and Rs. 3561/household in the evergreen and deciduous zones, respectively. Given that the bulk of the forest grids in Uttara Kannada district are projected to undergo change, bulk of the species which provide multiple forest products are projected to experience die back and even mortality. Incorporation of climate change projections and impacts in forest planning and management is necessary to enable forest ecosystems to enhance resilience.
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