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Vallam, India

Periyar Maniammai University is an Indian university in the town of Vallam Thanjavur, Thanjavur district, Tamil Nadu, India. Wikipedia.

Lakshmana Gomathi Nayagam V.,National Institute of Technology Tiruchirappalli | Muralikrishnan S.,Anna University | Sivaraman G.,Periyar Maniammai University
Expert Systems with Applications | Year: 2011

Out of several generalizations of fuzzy set theory for various objectives, the notions introduced by Atanassov (1983) and Atanassov and Gargov (1989) in defining intuitionistic fuzzy sets and interval-valued intuitionistic fuzzy sets are interesting and very useful in modeling real life problems. Ranking of interval-valued intuitionistic fuzzy sets plays a vital role in decision-making, data analysis, artificial intelligence and socioeconomic system and it was studied in Xu (2007c), Xu and Chen (2007a) and Ye (2009). In this paper a new method for ranking interval-valued intuitionistic fuzzy sets has been introduced and studied. The method is illustrated by numerical examples and compared with other methods. And then a new method for handling multi-criteria fuzzy decision-making problems based on interval-valued intuitionistic fuzzy sets is presented in which criterion values for alternatives are interval-valued intuitionistic fuzzy sets. The method proposed here can provide a useful way to efficiently help the decision-maker to make his decision. An illustrative example is given to verify the developed approach and to demonstrate its practicality and effectiveness. © 2010 Elsevier Ltd. All rights reserved. Source

Kumar C.K.,Periyar Maniammai University | Kumar A.N.,Coimbatore Institute of Technology
International Journal of Green Energy | Year: 2012

Monitoring and diagnosis of power quality is an important aspect in studies pertaining to the performance of a photovoltaic (PV) system. This research analyzes the role of a mixed snubber circuit in reducing the conducted electromagnetic interference (EMI) emissions on a charge controller of a low power, standalone, PV system connected to a common DC bus. The mixed snubber circuit has been found to suppress the conducted EMI and reduce power dissipation in a MOSFET when connected across a MOSFET-based buck converter. This research reports the effects of the conducted EMI for varying ranges of duty cycle of the buck converter for achieving maximum power tracking. This research has been carried out on a standalone, 4050 W PV plant, and the conducted EMI has been measured in real time and also verified by carrying out a simulation using PSPICE software to ascertain the effectiveness of the mixed snubber circuit. The results of the simulation were found to be in agreement with the results of various experimental studies. The exhaustive analysis indicates that the mitigation of EMI is due to the addition of the mixed snubber circuit along with the MOSFET-based converter arrangement. © 2012 Copyright Taylor and Francis Group, LLC. Source

Rajasimman M.,Annamalai University | Karthic P.,Periyar Maniammai University
Journal of the Taiwan Institute of Chemical Engineers | Year: 2010

Response surface methodology (RSM) is used to optimize the process parameters for the extraction of chromium from aqueous solution of waste sodium dichromate recovered from the pharmaceutical industry wastewater using emulsion liquid membrane technique. The liquid membrane used was composed of kerosene oil as the solvent, SPAN-80 as the surfactant and potassium hydroxide as internal reagent and trioctylamine as carrier. The process parameters namely, feed concentration, pH, internal reagent concentration and surfactant concentration on the extraction of chromium were optimized using Box-Behnken design. The optimum conditions for the extraction of chromium (VI) were: feed concentration (224.04 ppm), pH (2.76), internal reagent concentration (0.71 N) and surfactant concentration (1.92%, w/w). At the optimized condition the maximum chromium extraction was found to be 92.50%. © 2009 Taiwan Institute of Chemical Engineers. Source

Boomadevi S.,Periyar Maniammai University | Pandiyan K.,SASTRA University
Physica B: Condensed Matter | Year: 2014

Single crystals of l-alanine of dimensions 2×1.1×0.5 cm 3 were grown by evaporation method using deionised water as a solvent. The morphology of the grown crystals had (1 2 0) and (0 1 1) as their prominent faces. UV-vis-near IR spectrum shows the transparency range of l-alanine crystal available for frequency doubling from 250 to 1400 nm. Phase-matched second harmonic generation was observed in l-alanine sample by using 7 ns Q-switched Nd:YAG laser with OPO set up. In the present work, phase matching was achieved by angle and wavelength tuning. The angular and spectral phase-matching bandwidths were determined experimentally for a 1.5 mm thick l-alanine crystal and the results have been compared with their theoretical results. Further the possible reasons for the broadening of SHG spectrum have been discussed. © 2013 Elsevier B.V. Source

Arockia Bazil Raj A.,Kings College | Arputha Vijaya Selvi J.,Kings College | Kumar D.,Periyar Maniammai University | Sivakumaran N.,National Institute of Technology Tiruchirappalli
Applied Optics | Year: 2014

In free-space optical link (FSOL), atmospheric turbulence causes fluctuations in both intensity and phase of the received beam and impairing link performance. The beam motionisone of the main causes for major power loss. This paper presents an investigation on the performance of two types of controller designed for aiming a laser beam to be at a particular spot under dynamic disturbances. The multiple experiment observability nonlinear input-output data mapping is used as the principal components for controllers design. The first design is based on the Taguchi method while the second is artificial neural network method. These controllers process the beam location information from a static linear map of 2D plane: optoelectronic position detector, as observer, and then generate the necessary outputs to steer the beam with a microelectromechanical mirror: fast steering mirror. The beam centroid is computed using monopulse algorithm. Evidence of suitability and effectiveness of the proposed controllers are comprehensively assessed and quantitatively measuredin terms of coefficient of correlation, correction speed, control exactness, centroid displacement, and stability of the receiver signal through the experimental results from the FSO link setup established for the horizontal range of 0.5 km at an altitude of 15.25 m. The test field type is open flat terrain, grass, and few isolated obstacles. © 2014 Optical Society of America. Source

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