Barddhamān, India
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Gangopadhyay S.,Syamsundar College
Nonlinear Optics Quantum Optics | Year: 2016

Light amplification by stimulated emission of radiation, that is - lasers, have become an important tool in chemistry. Lasers are ideal light sources for spectroscopy, chemical kinetics studies, and light scattering studies of molecular motion. High-powered lasers are finding use as light sources for photochemical synthesis, yielding products not available from other techniques. Dye lasers are an important class of lasers because they can be tuned to a range of wavelengths. The lasers you are probably familiar with, like He-Ne lasers, produce only fixed wavelengths and are therefore not good sources for spectroscopic studies. In this lab you will measure the absorption and fluorescence characteristics of several laser dyes and then set up a dye laser with the dyes and compare the laser emission characteristics. ©2016 Old City Publishing, Inc.


Samanta T.,Syamsundar College | Ray A.,Syamsundar College
Journal of Chemical Thermodynamics | Year: 2010

Densities and viscosities of urea in (1.0, 2.5, and 5.0) mass% of aqueous glucose solutions have been measured at T = (298.15, 303.15, 308.15, and 313.15) K, respectively. Apparent molar volumes, limiting partial molar volume, and relative viscosity have been obtained from the density and viscosity data. Limiting partial molar expansibilities have also been calculated from the temperature dependence of limiting partial molar volumes. The viscosity data has been analyzed using the Jones-Dole equation. The results are used to establish the nature of solute-solute and solute-solvent interactions. The activation parameters of viscous flow have also been calculated on the basis of transition state treatment of the relative viscosity. Result shows that the solute acts as water structure breaker and posses' weak solute-solvent interaction. © 2009 Elsevier Ltd. All rights reserved.


Samanta T.,Syamsundar College | Saharay S.K.,Syamsundar College
Journal of Chemical Thermodynamics | Year: 2010

Densities and viscosities of glucose in (1.0, 2.5, and 5.0) mass% aqueous urea solutions have been measured at T = (298.15, 303.15, 308.15, and 313.15) K, respectively. Apparent molar volumes, limiting partial molar volume, and relative viscosity have been obtained from the density and viscosity results. Limiting partial molar expansibilities have also been calculated from the temperature dependence of limiting partial molar volumes. The viscosity data have been analyzed by using the modified Jones-Dole equation. The results are used to establish the nature of solute-solute and solute-solvent interactions. Transition state treatment of the relative viscosity was also used for the calculation of activation parameters of viscous flow. Pour findings show that the solute acts as a water structure former and provides strong solute-solvent interaction. © 2010 Elsevier Ltd. All rights reserved.


Datta S.K.,University of Burdwan | Sarkar K.,Syamsundar College
International Journal of Global Environmental Issues | Year: 2013

A world-wide concern has recently emerged about the rapid depletion of natural resources and degradation of environmental conditions caused by the actions of both developed and developing groups of countries. Analysis of panel data covering the period 1990-2008, shows that developed countries are facing an N-shaped curve regarding the relation between income and CO2 emission while EKC relation holds for developing countries. The observance of EKC should not however make the developing countries complacent. The observed convergence in CO2 emission growth indicates that the developing region is catching up at a faster rate with the developed countries. Hence, with an extended future time, there is likelihood that N-shaped pattern might ensue for developing countries also. Introduction of economic instruments for pollution control and strict enforcement laws, greater use of captive mechanism for carbon capture, strengthening institutional rules of forest management though greater peoples' participation in forest protection and plantation necessary for enhancing carbon pool capacity of forest, rapid grant of indigenous forest rights, blocking the entry of hazardous products through multinational companies, gradual shift to renewable energy sources, like biodiesel, ethanol, etc., might partially reverse such possibility. Copyright © 2013 Inderscience Enterprises Ltd.

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