Informatics Publishing Limited

Piare Lal , H. D. Kulkarni , S. N. Rao

Abstract

Forestry should be treated as a complementary rather than a competing land use, vis a-vis agriculture. National forests are under intense biotic pressure with low growing stock and poor productivity. Even after taking all possible measures for restoring the growing stock and improving land productivity of forests from the current level of 32 million m³/yr, it Will not be possible to meet the growing national needs for timber and wood projected at 418 million m³/yr by 2010 AD. Well-planned investment in technology based plantations, with genetically superior planting stock on vacant government lands, reclaimable wastlands, rail road and canal strips, combined with massive thrust in agroforestry plantations, should be a national priority. Improved package of practices, scientific management of plantations with accountability for results, technical extension services, long-term finance and marketing support for agroforestry plantations, will play a vital role in bridging the gap between demand and availability of wood. Such plantations will also generate ample employment opportunities for the rural poor and contribute immensely to the greening of the country, amelioration of the environment, maintenance of the ecological balance and life-support systems. Succesful implementataion of the reafforestation and agroforestry programmes will help sustain improvement of agricultural productivity and production through soil and water conservation and release large quantities of cow-dung for use as farmyard manure to restore soil fertility.

Full Text

     

S. N. Rao

Abstract

No Abstract.

Full Text

   

S. N. Rao

Abstract

No Abstract.

Full Text

   

S. N. Paul ¹, Vineet V. Karambelkar ¹, S. N. Rao ², J. D. Ekhe ³

Affiliations
1 Department of Metallurgical and Materials Engineering, Visvesvaraya National Institute of Technology, Nagpur - 440010, Maharashtra, IN
2 Department of Chemistry, Priyadarshini Institute of Engineering and Technology, Rashtrasant Tukadoji Maharaj Nagpur University, Nagpur - 400001, Maharashtra, IN
3 Department of Chemistry, Visvesvaraya National Institute of Technology, Nagpur - 440010, Maharashtra, IN

Abstract

Buckingham π theorem was applied to model polypyrrole synthesis done by inverse emulsion polymerization route using Methanesulfonic acid as a dopant and potassium persulfate as an oxidant. A list of independent parameters on which polymerization depends was selected and by means of Buckingham theorem a functional relation between three dimensionless quantities; percent yield, conductivity and temperature was obtained. The actual form of the function was determined on the basis of experimental analysis and linear regression analysis. The accuracy of the proposed application was scrutinized by synthesizing pristine polypyrrole salt by the said polymerization route. It was corroborated from the experiment that the increase in percent yield and conductivity was directly proportional to the increase in oxidant concentration. Conductivity as high as 3.77 S/cm was obtained with a maximum percent yield of 94.54% at a moderate temperature range (293 K-298 K).

Keywords

Buckingham Pi Theorem, Chemical Oxidative Polymerization, Dimensionless Quantities, Mathematical Modeling, Polypyrrole, Regression Analysis

Full Text