Harilal, S S; Issac, Riju C; Bindhu, C V; Nampoori, V P N; Vallabhan, C P G(American Institute of Physics, April , 1997)
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Abstract:
The emission features of laser ablated graphite plume generated in a helium ambient atmosphere have been investigated with time and space resolved plasma diagnostic technique. Time resolved optical emission spectroscopy is employed to reveal the velocity distribution of different species ejected during ablation. At lower values of laser fluences only a slowly propagating component of C2 is seen. At high fluences emission from C2 shows a twin peak distribution in time. The formation of an emission peak with diminished time delay giving an energetic peak at higher laser fluences is attributed to many body recombination. It is also observed that these double peaks get modified into triple peak time of flight distribution at distances greater than 16 mm from the target. The occurrence of multiple peaks in the C2 emission is mainly due to the delays caused from the different formation mechanism of C2 species. The velocity distribution of the faster peak exhibits an oscillating character with distance from the target surface.
Hatha, A A M; Rinoy, Varghese(Indian Society for Education and Environment, March , 2012)
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Abstract:
There are a large number of agronomic-ecological interactions that occur in a world with increasing levels of CO2, higher
temperatures and a more variable climate. Climate change and the associated severe problems will alter soil microbial
populations and diversity. Soils supply many atmospheric green house gases by performing as sources or sinks. The most
important of these gases include CH4, CO2 and N2O. Most of the green house gases production and consumption processes in
soil are probably due to microorganisms. There is strong inquisitiveness to store carbon (C) in soils to balance global climate
change. Microorganisms are vital to C sequestration by mediating putrefaction and controlling the paneling of plant residue-C
between CO2 respiration losses or storage in semi-permanent soil-C pools. Microbial population groups and utility can be
manipulated or distorted in the course of disturbance and C inputs to either support or edge the retention of C. Fungi play a
significant role in decomposition and appear to produce organic matter that is more recalcitrant and favor long-term C storage
and thus are key functional group to focus on in developing C sequestration systems. Plant residue chemistry can influence
microbial communities and C loss or flow into soil C pools. Therefore, as research takings to maximize C sequestration for
agricultural and forest ecosystems - moreover plant biomass production, similar studies should be conducted on microbial
communities that considers the environmental situations
Description:
Indian J. Edu. Inf. Manage., Vol. 1, No. 3 (Mar 2012)