Browsing by Author "Venkatesh, A."

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Air quality assessment of Dhanbad District, India - A case study
(2010) Venkatesh, A.; Singh, G.; Reddy, D.V.
Ambient air pollution status in Dhanbad district is studied and presented in this article. The selection of Dhanbad is made considering its importance and the nature of activities taking place around the district. For the assessment of ambient air quality in Dhanbad, the following five locations were chosen: Main Gate of Indian School of Mines(ISM), Dhanbad: It is a site representing purely commercial activities and road traffic. Bankmore: It is one of the busiest marketing centres of the district and is surrounded by residential areas. All the vehicles going to Bokaro pass by this place and thus the traffic density is pretty high. Kusunda: It is a place 10.9 kilometres from Dhanbad Railway Station. It is just beside one of the coal mines, hence, all vehicles going to the mine passes through this place. Steel Gate: It consists of a small market. Trucks and other heavy vehicle are more frequent during night as this road connects to a highway. ISM Admin Block: It can be considered as a sensitive area since it is a very calm place where the usage of vehicles is minimum throughout the day. Monitoring of ambient air quality is done following the standard procedure prescribed in IS: 5182. In addition, the concentration of lead, zinc, cadmium, copper, manganese and iron metals in SPM is also monitored. The ambient air quality assessment was done in the month of June, 2009. The concentration of SPM was higher than the permissible limit in three locations namely ISM Main Gate, Bankmore and Steel Gate, while it was less than the permissible limit in other two locations, ISM Admin Block and Kusunda. Since the generation of SPM was mainly due to vehicular traffic it was expected to cross the limit in the above mentioned three locations as density of vehicular movement is very high. 2010 CAFET-INNOVA TECHNICAL SOCIETY.
MPI-based parallel synchronous vector evaluated particle swarm optimization for multi-objective design optimization of composite structures
(2012) Omkar, S.N.; Venkatesh, A.; Mudigere, M.
This paper presents a decentralized/peer-to-peer architecture-based parallel version of the vector evaluated particle swarm optimization (VEPSO) algorithm for multi-objective design optimization of laminated composite plates using message passing interface (MPI). The design optimization of laminated composite plates being a combinatorially explosive constrained non-linear optimization problem (CNOP), with many design variables and a vast solution space, warrants the use of non-parametric and heuristic optimization algorithms like PSO. Optimization requires minimizing both the weight and cost of these composite plates, simultaneously, which renders the problem multi-objective. Hence VEPSO, a multi-objective variant of the PSO algorithm, is used. Despite the use of such a heuristic, the application problem, being computationally intensive, suffers from long execution times due to sequential computation. Hence, a parallel version of the PSO algorithm for the problem has been developed to run on several nodes of an IBM P720 cluster. The proposed parallel algorithm, using MPI's collective communication directives, establishes a peer-to-peer relationship between the constituent parallel processes, deviating from the more common master-slave approach, in achieving reduction of computation time by factor of up to 10. Finally we show the effectiveness of the proposed parallel algorithm by comparing it with a serial implementation of VEPSO and a parallel implementation of the vector evaluated genetic algorithm (VEGA) for the same design problem. 2012 Elsevier Ltd. All rights reserved.
MPI-based parallel synchronous vector evaluated particle swarm optimization for multi-objective design optimization of composite structures
(2012) Omkar, S.N.; Venkatesh, A.; Mudigere, M.
This paper presents a decentralized/peer-to-peer architecture-based parallel version of the vector evaluated particle swarm optimization (VEPSO) algorithm for multi-objective design optimization of laminated composite plates using message passing interface (MPI). The design optimization of laminated composite plates being a combinatorially explosive constrained non-linear optimization problem (CNOP), with many design variables and a vast solution space, warrants the use of non-parametric and heuristic optimization algorithms like PSO. Optimization requires minimizing both the weight and cost of these composite plates, simultaneously, which renders the problem multi-objective. Hence VEPSO, a multi-objective variant of the PSO algorithm, is used. Despite the use of such a heuristic, the application problem, being computationally intensive, suffers from long execution times due to sequential computation. Hence, a parallel version of the PSO algorithm for the problem has been developed to run on several nodes of an IBM P720 cluster. The proposed parallel algorithm, using MPI's collective communication directives, establishes a peer-to-peer relationship between the constituent parallel processes, deviating from the more common master-slave approach, in achieving reduction of computation time by factor of up to 10. Finally we show the effectiveness of the proposed parallel algorithm by comparing it with a serial implementation of VEPSO and a parallel implementation of the vector evaluated genetic algorithm (VEGA) for the same design problem. © 2012 Elsevier Ltd. All rights reserved.
Removal of acutely hazardous pharmaceuticals from water using multi-template imprinted polymer adsorbent
(2014) Venkatesh, A.; Chopra, N.; Krupadam, R.J.
Molecularly imprinted polymer adsorbent has been prepared to remove a group of recalcitrant and acutely hazardous (p-type) chemicals from water and wastewaters. The polymer adsorbent exhibited twofold higher adsorption capacity than the commercially used polystyrene divinylbenzene resin (XAD) and powdered activated carbon adsorbents. Higher adsorption capacity of the polymer adsorbent was explained on the basis of high specific surface area formed during molecular imprinting process. Freundlich isotherms drawn showed that the adsorption of p-type chemicals onto polymer adsorbent was kinetically faster than the other reference adsorbents. Matrix effect on adsorption of p-type chemicals was minimal, and also polymer adsorbent was amenable to regeneration by washing with water/methanol (3:1, v/v) solution. The polymer adsorbent was unaltered in its adsorption capacity up to 10 cycles of adsorption and desorption, which will be more desirable in cost reduction of treatment compared with single-time-use activated carbon. 2014 Springer-Verlag Berlin Heidelberg.
Removal of acutely hazardous pharmaceuticals from water using multi-template imprinted polymer adsorbent
(Ecomed Publishers susanne.kuehbandner@hjr-verlag.de, 2014) Venkatesh, A.; Chopra, N.; Krupadam, R.J.
Molecularly imprinted polymer adsorbent has been prepared to remove a group of recalcitrant and acutely hazardous (p-type) chemicals from water and wastewaters. The polymer adsorbent exhibited twofold higher adsorption capacity than the commercially used polystyrene divinylbenzene resin (XAD) and powdered activated carbon adsorbents. Higher adsorption capacity of the polymer adsorbent was explained on the basis of high specific surface area formed during molecular imprinting process. Freundlich isotherms drawn showed that the adsorption of p-type chemicals onto polymer adsorbent was kinetically faster than the other reference adsorbents. Matrix effect on adsorption of p-type chemicals was minimal, and also polymer adsorbent was amenable to regeneration by washing with water/methanol (3:1, v/v) solution. The polymer adsorbent was unaltered in its adsorption capacity up to 10 cycles of adsorption and desorption, which will be more desirable in cost reduction of treatment compared with single-time-use activated carbon. © 2014 Springer-Verlag Berlin Heidelberg.
Stability of horizontal oil well - A Jointed Rock model approach
(2011) Venkatesh, A.; Singh, T.N.; Venkat, Reddy, D.
Advancement in technology has paved different ways for the extraction of oil. Drilling of wells, production and injection of fluids results in the alteration of pre-existing stress field in a reservoir. The current study is undertaken to analyze the stability of horizontal oil wells with the change in radius of the well, Poisson's ratio, saturation density, permeability and also to find stress distribution around horizontal oil wells drilled in different reservoir conditions, stress distribution before and after production and also to assess the effect of stress distribution on the stability. The knowledge of stress distribution and its redistribution with change in reservoir conditions can help in selecting well locations and orientations for maximum sweep in reservoirs. Displacement of the particles gives the direction of fracture propagation. As the particle size increases, fracture propagation increases. The stability analysis has been done using Jointed Rock method of Numerical Modeling. Numerical models are mathematical models that use numerical time-stepping procedure to obtain the models behavior over time. The results of the model are shown to agree qualitatively with field observations. The extent of stress distribution is dependent on radius of the well, pore pressure in the reservoir, fracture density of the reservoir and drilling direction. Horizontal wells drilled in highly fractured reservoirs will be less stable. In case of anisotropy, since the stability is very less we must reduce the radius of the well in order to increase the FOS and hence the stability. 2011 CAFET-INNOVA TECHNICAL SOCIETY.