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Rathod N.R.,Maharaja Krishnakumarsinhji Bhavnagar University | Rathod N.R.,Vadodara Institute of Engineering | Gupta S.K.,Maharaja Krishnakumarsinhji Bhavnagar University | Gupta S.K.,Michigan Technological University | And 2 more authors.
Computational Materials Science | Year: 2013

The structural, electronic, elastic and lattice dynamic along with the allied properties like superconductivity, thermal conductivity and electrical resistivity of palladium carbide (PdC) in two crystallographic phases are studied using the first principles ab initio calculations. The calculated mechanical and lattice dynamical properties shows mechanical and dynamical stability of PdC in rock salt phase. The superconducting transition temperature of about 15 K for RS-PdC suggests its being a superconductivity material. The possible use of PdC in thermoelectric devices using thermal conductivity and resistivity is also discussed. The present study suggests that the PdC can be a potential candidate for the thermoelectric application at higher temperatures. © 2013 Elsevier B.V. All rights reserved. Source


Bhavsar H.H.,Vadodara Institute of Engineering
2014 International Conference on Computation of Power, Energy, Information and Communication, ICCPEIC 2014 | Year: 2014

The Multifunctional Gateway Sensor Node is an extension of the Gateway sensor node of Wireless Sensor Network having multiple functionalities. Addendum of functionalities comprise different types of technologies which are LCD Color display, keypad to operate Gateway Node, AVR camera and solar panel for additional power support. The node itself also acts as a weather station based on Fuzzy AHP for precise decision support. So the main idea behind this research is to operate WSN without computer. It will be most usable in agriculture, forest monitoring as well as marine securities when pc is unavailable. The location of particular place for weather station feature will be selected by the help of Koppen Classification, instead of GPS. This sensor node is also operable by the specially designed java based software having great intelligence as per the locality. Hence the paper presents the idea about the proposed research area. © 2014 IEEE. Source


Singh R.,Vadodara Institute of Engineering | Singh D.K.,IET Alwar
Proceedings - 2012 2nd International Conference on Advanced Computing and Communication Technologies, ACCT 2012 | Year: 2011

This paper deals with control strategies for DSTATCOM (Distribution Static Compensator) for power quality improvement for a three-phase, three-wire distribution system. A three-leg voltage source inverter (VSI) configuration with a dc bus capacitor is employed as DSTATCOM. The PWM current controllers are designed analyzed and compare for PI controller. The capability of the DSTATCOM is demonstrated through results obtained using PSIM. The performance of the DSTATCOM acting as a shunt compensator is found satisfactory under varied load perturbations. © 2012 IEEE. Source


J. Patel U.,Vadodara Institute of Engineering | Chothani N.G.,A D Patel Institute of Technology | Bhatt P.J.,Vadodara Institute of Engineering
International Journal of Emerging Electric Power Systems | Year: 2016

Sudden changes in loading or configuration of an electrical network causes power swing which may result in an unwanted tripping of the distance relay. Hence, it becomes utmost necessary to rapidly and reliably discriminate between actual fault and power swing conditions in order to prevent instability in power network due to mal operation of distance relay. This paper proposes a novel method for the discrimination between fault and power swing based on rate of change of voltage and reactive power measured at relay location. The effectiveness of the proposed algorithm is evaluated by simulating series of power swing conditions in PSCAD/EMTDC® software for different disturbances such as change in mechanical power input to synchronous generator, tripping of parallel line due to fault and sudden application of heavy load. It is revealed that the distance relay gives successful tripping in case of different fault conditions and remains inoperative for power swing with the implementation of the proposed algorithm. Moreover, the proposed scheme has ability to distinguish the symmetrical and asymmetrical fault occurrence during power swing condition. © 2016 by De Gruyter. Source


Rathod N.,Bhavnagar University | Rathod N.,Vadodara Institute of Engineering | Gupta S.K.,Bhavnagar University | Jha P.K.,Bhavnagar University
Phase Transitions | Year: 2012

A comprehensive first principles study of structural, elastic, electronic, and phonon properties of zirconium carbide (ZrC) is reported within the density functional theory scheme. The aim is to primarily focus on the vibrational properties of this transition metal carbide to understand the mechanism of phase transition. The ground state properties such as lattice constant, elastic constants, bulk modulus, shear modulus, electronic band structure, and phonon dispersion curves (PDC) of ZrC in rock-salt (RS) and high-pressure CsCl structures are determined. The pressure-dependent PDCs are also reported in NaCl phase. The phonon modes become softer and finally attain imaginary frequency with the increase of pressure. The lattice degree of freedom is used to explain the phase transition. Static calculations predict the RS to CsCl phase transition to occur at 308GPa at 0K. Dynamical calculations lower this pressure by about 40GPa. The phonon density of states, electron-phonon interaction coefficient, and Eliashberg's function are also presented. The calculated electron-phonon coupling constant and superconducting transition temperature agree reasonably well with the available experimental data. © 2012 Copyright Taylor and Francis Group, LLC. Source

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