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Search Results: 1 - 10 of 28 matches for " Kokilavani Varadharajan "
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Application of αδ-Closed Sets  [PDF]
Kokilavani Varadharajan, Basker Palaniswamy
Applied Mathematics (AM) , 2013, DOI: 10.4236/am.2013.41001

In this paper, we introduce the notion of αδ-US spaces. Also we study the concepts of αδ-convergence, sequentially αδ-compactness, sequentially αδ-continunity and sequentially αδ-sub-continuity and derive some of their properties.

Power Quality Analysis and Enhancement of Grid Connected Solar Energy System  [PDF]
Kokilavani Thangaraj, Selvakumar Gopalasamy
Circuits and Systems (CS) , 2016, DOI: 10.4236/cs.2016.78170
Abstract: In recent years, renewable energy resources are utilized to meet the growing energy demand. The integration of renewable energy resources with the grid incorporates power electronic converters for conversion of energy. These power electronic converters introduce power quality issues such as a harmonics, voltage regulation etc. Hence, to improve the power quality issues, this work proposes a new control strategy for a grid interconnected solar system. In this proposed work, a maximum power point tracking (MPPT) scheme has been used to obtain maximum power from the solar system and DC/DC converter is implemented to maintain a constant DC voltage. An active filtering method is utilized to improve the power quality of the grid connected solar system. The proposed system is validated through dynamic simulation using MATLAB/Simulink Power system toolbox and results are delivered to validate the effectiveness of the work.
Analytical solution of the concentration and current in the electoenzymatic processes involved in a PPO-rotating-disk-bioelectrode  [PDF]
Govindhan. Varadharajan, Lakshmanan. Rajendran
Natural Science (NS) , 2011, DOI: 10.4236/ns.2011.31001
Abstract: A mathematical model for electroenzymatic process of a rotating-disk-bioelectrode in which polyphenol oxidase occurs for all values of concentration of catechol substrate is presented. The model is based on system of reaction-diffusion equations containing a non-linear term related to Michaelis-Menten kinetics of the enzymatic reaction. Approximate analytical method (He’s Homotopy perturbation method) is used to solve the non-linear differential equations that describe the diffusion coupled with a Michaelis-Menten kinetics law. Closed analytical expressions for substrate concentration, product concentration and corresponding current response have been derived for all values of parameter using perturbation method. These results are compared with simulation results and are found to be in good agreement. The obtained results are valid for the whole solution domain.
Analytical solution of coupled non-linear second order differential equations in enzyme kinetics  [PDF]
Govindhan Varadharajan, Lakshmanan Rajendran
Natural Science (NS) , 2011, DOI: 10.4236/ns.2011.36063
Abstract: The coupled system of non-linear second-order reaction differential equation in basic enzyme reaction is formulated and closed analytical ex-pressions for substrate and product concentra-tions are presented. Approximate analytical me-thod (He’s Homotopy perturbation method) is used to solve the coupled non-linear differential equations containing a non-linear term related to enzymatic reaction. Closed analytical expres-sions for substrate concentration, enzyme sub-strate concentration and product concentration have been derived in terms of dimensionless reaction diffusion parameters k, and us-ing perturbation method. These results are compared with simulation results and are found to be in good agreement. The obtained results are valid for the whole solution domain.
Analytical Solutions of System of Non-Linear Differential Equations in the Single-Enzyme, Single-Substrate Reaction with Non-Mechanism-Based Enzyme Inactivation  [PDF]
Govindhan Varadharajan, Lakshmanan Rajendran
Applied Mathematics (AM) , 2011, DOI: 10.4236/am.2011.29158
Abstract: A closed form of an analytical expression of concentration in the single-enzyme, single-substrate system for the full range of enzyme activities has been derived. The time dependent analytical solution for substrate, enzyme-substrate complex and product concentrations are presented by solving system of non-linear differential equation. We employ He’s Homotopy perturbation method to solve the coupled non-linear differential equations containing a non-linear term related to basic enzymatic reaction. The time dependent simple analytical expressions for substrate, enzyme-substrate and free enzyme concentrations have been derived in terms of dimensionless reaction diffusion parameters ε, λ1, λ2 and λ3 using perturbation method. The numerical solution of the problem is also reported using SCILAB software program. The analytical results are compared with our numerical results. An excellent agreement with simulation data is noted. The obtained results are valid for the whole solution domain.
Sathya M,Kokilavani R
Journal of Drug Delivery and Therapeutics , 2012,
Abstract: The effect of the alcoholic extract of Saccharum spontaneum (Poaceae) against glycolic acid induced urolithiasis urolithiasis in albino rats is summarized in this study. Lithiasis was induced in rats by fed with a calculi-producing diet (CPD: commercial diet mixed with 3% glycolic acid) for 28 days and was manifested by high urinary calcium, phosphate, oxalate, protein, and low urinary magnesium content. Therapeutic treatment with plant extract (200 and 300mg/kg b.wt.dose-1 day-1oral-1) has significantly ameliorated to near normalcy in the curative group. It also increased the urine volume, thereby reducing the tendency for crystallization. These results of the present study concluded that S.spontaneum can play an important role in the prevention of disorders associated with kidney stone formation.
Acute and Subacute Toxicity Evaluation of Ethanolic Root Extract of Saccharum spontaneum Linn. (Poaceae) in Experimental Rats
M. Sathya,R. Kokilavani
International Journal of Pharmaceutical and Phytopharmacological Research , 2012,
Abstract: The present investigation was intended to evaluate the toxicity of the ethanolic root extract of a traditionally used plant Saccharum spontaneum Linn (S.spontaneum). The acute toxicity studies was done on male wistar albino rats which showed no clinical signs, no mortality of the rats even under higher dosages levels (50, 150, 300, 500, 1000, 2000mg/kg b.wt) indicating the high margin of safety of the plant extract. The sub acute toxicity study was done to find out the effective dosage of the plant in rats. The varying doses (100,200,300,400, and 500mg/kg b.wt) of the plant extract were administered orally to different groups of male wistar strain of albino rats on daily basis and sacrificed after 28 days of administration. There was no change in the body weight and no mortality was found in the experimental animals during the study period. The record of biochemical parameters like calcium, oxalate, phosphorus, magnesium protein, urea, uric acid, creatinine, sodium, potassium and chloride in treatment groups of rats were non significant in comparison with control group of rats. The parameters remained within the normal range. The results of study have suggested there was no obvious toxicity observed with the treatment of S.spontaneum It was found to be safe alternative for various severe infections.
Preliminary phytochemical analysis and cytotoxic potential of Cucumis trigonus Roxb
Balakrishnan Arunachalam,Kokilavani Chinnaraju
Journal of Intercultural Ethnopharmacology , 2012, DOI: 10.5455/jice.20120117121046
Abstract: Aim: The present study involves in the investigation of various extracts of Cucumis trigonus Roxb. for its phytochemical constituents and also the cytotoxic potential of the Cucumis trigonus Roxb. ethanolic fruit extract. Methods: The phytochemical screening with methanol, ethanol, petroleum ether, chloroform and aqueous extracts of Cucumis trigonus Roxb. was done by modern method of Peach and Tracey (1955) Cytotoxicity is estimated by staining technique using Trypan blue after the addition of drug, the dead cells are stained blue with Trypan blue. Confirmation studies were done by additional metabolic intervention experiments like (3-(4, 5-dimethyl thiazol-2yl)-2, 5-diphenyl tetrazolium bromide) MTT assays. Results: Qualitative phytochemical analysis of the plant extracts were done and it was found that the presence of phytochemicals were maximum in the ethanolic extract when compared to other extracts. So the ethanolic extract of C. trigonus fruit was used for further investigations. In the cytotoxic study the ethanolic fruit extract concentration at 1.25 mg / ml was found to be the effective dose because at this concentration, it exhibited 50% cytotoxicity against Hep2 cells. Conclusion: These results conclude that the ethanolic fruit extract of Cucumis trigonus possess a good phytochemical strength and also an effective cytotoxic potential. [J Intercult Ethnopharmacol 2012; 1(1.000): 13-18]
International Journal of Engineering Science and Technology , 2011,
Abstract: The control chart technique is being widely used in industries to monitor a process for quality improvement. One of the basic charts for attributes is the p-chart. For a p – chart each item is classified as either nonconforming or conforming to the specified quality characteristic. In Some cases, an item may be classified inmore than two categories such as “bad”, “medium”, “good”, and “excellent”. Based on this concept, Amirzadeh et al. [1] have developed Fuzzy Multinomial chart (FM-chart) with the fixed sample size (FSS). In this paper a Fuzzy Multinomial process with Variable Sample Size (VSS) is proposed and the control limits for the FM charthave been obtained using multinomial distribution. The proposed method is compared with the conventional p – chart. It is seen that FM chart with VSS performs better than the conventional chart.
Reviews of Progress , 2013,
Abstract: To achieve Millennium Development Goals, it is expected to reduce the Neonatal mortality by two third of the present rate. Every newborn requires basic care which has to be provided by the mother at home it includes warmth, feeding, basic hygiene and identification of danger signs, and seeking help from health personnel whenever required.
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