National Institute of Technology, Patna
Patna, India

The National Institute of Technology Patna , formerly Bihar School of Engineering and Bihar College of Engineering, is a public engineering institution located in Patna in the Indian state of Bihar. It was renamed to NIT Patna, by the Government of India on January 28, 2004. It is an autonomous institute functions directly under Ministry of Human Resource Development, Government of India. Wikipedia.

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Bhattacharya S.,National Institute of Technology, Patna
1st IEEE International Conference on Power Electronics, Intelligent Control and Energy Systems, ICPEICES 2016 | Year: 2016

Power Systems are inherently non-linear systems that are frequently subjected to various disturbances causing oscillations at low frequencies that may lead to instability. Generators are usually provided with power system stabilizers minimize the effect of these oscillations. The objective of this paper is find the optimal parameters for a conventional 'lead-lag compensator based Power System Stabilizer (PSS)' for a system comprising of a 'generator connected to an infinite bus' and containing a ST1A type excitation system. The tuning of the parameters of the 'Power System Stabilizer' is accomplished using the 'Particle Swarm Optimization (PSO)' algorithm. In this paper, a Fuzzy Power System Stabilizer (FPSS) where the optimal values of the parameters of the FPSS are decided using the PSO algorithm is also designed. The Particle Swarm Optimization based conventional PSS and the 'Particle Swarm Optimization based Fuzzy PSS' are also incorporated in a system containing multiple machines to check the system responses under different loading conditions and faults of different types. The simulation results clearly prove the efficiency of the PSO based conventional and fuzzy power system stabilizers in damping the low frequency speed and power oscillations occurring in the power system due to various disturbances. © 2016 IEEE.

Sharma B.K.,National Institute of Technology, Patna
Midwest Symposium on Circuits and Systems | Year: 2017

Sustained scaling for TerraHertz SiGe HBT has led to transit frequency = 315GHz at 300K but it has simultaneously degraded BVCEO to 1.63V.This has placed a high premium on UHF analog circuit design A theoretical formalism of the variable latching phenomena of CE BJT under various drive conditions, discovered by the Author in 1989, is one of the central problems in the design of high speed circuits. None of the industrial standards namely VBIC, HICUM and MEXTERM have been able to capture this feature.This paper takes a circuit plus device approach to develop a single analytic relation to model the variable latching phenomena of CE BJT current sources. This analytic relationship has been verified by experimental results using 2N3055 CE current sources with 90 percent confidence level. Proposed analytic relationship embedded in the compact model of HSPICE will enable exceptional model-To-hardware correlation in simulations of the variable latching phenomena and thereby lead to considerable improvement in concept-Todesign-To-industrial production. This in turn will vastly change the scale of economy of IC chips production. This study has also established tentatively that Universal Hybrid-pi model is the correct small signal model of CE BJT which has been reported in JSSC-July-16-0310. © 2016 IEEE.

Sinha A.K.,National Institute of Technology, Patna | Singh S.,National Institute of Technology, Patna
International Journal of Civil Engineering and Technology | Year: 2017

Frequent earthquakes round the globe and large no of structures vulnerable to it have necessitated the need for structural response control to gain pace in application around the globe. This paper discusses the use and effectiveness of one such device, fluid viscous dampers, for response control of structures and to reduce damping demand on structural system. In this paper a non-linear time history analysis has been carried out on a 3D model of a 12 story RCC MRF building using 3-directional synthetic accelerogram. Two different cases of building models with and without supplemental damping have been analyzed using ETABS. The story responses in terms of absolute maximum displacement and story drift have been compared. Time history response plots for the two models have also been compared for various responses viz. roof displacement and acceleration, base shear and story shear forces, along with the various energy components and damping behavior. The results of the time history analysis are in close conformation with previous investigations and represent the effectiveness of dampers in improving the structural response as well as damping demand on structural systems. © IAEME Publication.

Dasgupta S.,National Institute of Technology, Patna | Mukherjee P.S.,Indian Institute of Science
Organic and Biomolecular Chemistry | Year: 2017

Carboxylatopillar[n]arenes (CP[n]As, n = 5, 6, 7, 9, 10) are water soluble derivatives of pillar[n]arenes. The three-dimensional π-electron-rich cavity and carboxylate groups at the portals, enabled CP[n]A to have strong binding affinity in water, which has been successfully harnessed in fabricating responsive supramolecular assemblies from supra-amphiphiles and developing targeted drug delivery systems (DDSs). CP[n]A based supraamphiphiles have also been used for sensor applications. This review highlights the diverse applications of water soluble carboxylatopillar[n]arenes. © The Royal Society of Chemistry.

Khan M.N.,Indian Institute of Technology Patna | Pal S.,Indian Institute of Technology Patna | Parvin T.,National Institute of Technology, Patna | Choudhury L.H.,Indian Institute of Technology Patna
RSC Advances | Year: 2012

In this paper, we have described a simple and convenient method for the one-pot multicomponent reaction of aldehydes, malononitrile and thiols in the presence of a catalytic amount of Bronsted base potassium hydroxide for the efficient synthesis of highly functionalized pyridines. The notable features of this protocol are the simple experimental procedure, short reaction time, broad substrate scope and good yields using a catalytic amount of readily available and cheap base. The photophysical behaviours of the synthesized pyridines have been investigated by UV-Vis and fluorescence spectroscopy and some of the synthesized substituted pyridines exhibit promising fluorescence quantum yields. © 2012 The Royal Society of Chemistry.

Karamthulla S.,Indian Institute of Technology Patna | Pal S.,Indian Institute of Technology Patna | Parvin T.,National Institute of Technology, Patna | Choudhury L.H.,Indian Institute of Technology Patna
RSC Advances | Year: 2014

A series of 2H-benzo[g]pyrazolo[3,4-b]quinoline-5,10(4H,11H)-dione derivatives has been synthesized from the three component reactions of 2-hydroxy-1,4-naphthoquinone, aldehydes, and aminopyrazoles in the presence of a catalytic amount of l-proline. This domino reaction proceeds smoothly in good to excellent yields and offers several advantages including no column chromatography, a simple reaction procedure, metal-free reaction conditions and being applicable to a broad range of aldehydes. © the Partner Organisations 2014.

Mahato D.K.,National Institute of Technology, Patna | Sinha T.P.,Bose Institute of India
Journal of Alloys and Compounds | Year: 2015

Sample of Pr2CoZrO6 (PCZ) was synthesized through the standard solid state reaction method. X-ray diffraction experiments and least square-like analysis reveal that the material crystallizes in an orthorhombic structure. SEM image displayed well-defined regular shaped spherical grains with average grain-size 0.615 μm. Frequency dependence of impedance and electric modulus properties are studied over a wide frequency range of 44 Hz to 1 MHz at various temperatures to confirm the contribution from grain and grain-boundary. Impedance data are presented in the Nyquist plot which is used to identify an equivalent circuit and fundamental circuit parameters. Scaling behavior of the impedance data suggests that the relaxation describes the same mechanism at various temperatures. The ac conductivity data has been analyzed by fitting the data into Jonscher power law and the conduction in this system is interpreted as due to small polaron hopping. Summerfield scaling plot is used to investigate Arrhenius temperature dependence of conductivity. © 2015 Published by Elsevier B.V.

Mahato D.K.,National Institute of Technology, Patna | Sinha T.P.,Bose Institute of India
Journal of Materials Science: Materials in Electronics | Year: 2013

The polycrystalline praseodymium zinc zirconate Pr2ZnZrO 6 (PZZO) is synthesized at 1,150 C by means of solid state reaction technique. X-ray structural analysis confirmed the formation of a single phase monoclinic structure at room temperature. The nonzero intercept in the Nyquist plot indicates the presence of an arc for frequency higher than the maximum frequency measured (1 MHz). Comparative study of the impedance and modulus plot confirm the contribution from grain and grain-boundary and grain-boundary contribution dominates in the material. The activation energy of the compound calculated from imaginary part of impedance plot is found to be 0.442 eV which suggests that the polaron hopping is responsible for conduction mechanism in PZZO. Semiconducting behavior of the material is observed. Summerfield scaling shows a quite satisfying overlap of the data at different temperatures on a single master curve. © 2013 Springer Science+Business Media New York.

Choudhary M.,National Institute of Technology, Patna | Patel R.N.,A.P.S. University | Rawat S.P.,A.P.S. University
Journal of Molecular Structure | Year: 2014

Three new copper (II) complexes viz. [Cu(L1)(bipy)] ×2H2O 1, [Cu(L1)(dmp)]×CH3CN 2, [Cu(L1)(phen)] 3 where L1H2 = 2-{[(Z)-(5-bromo-2-hydroxyphenyl)methylidene]amino}benzoic acid, bipy = 2,2′-bipyridine; dmp = 2,9-dimethyl 1,10-phenanthroline, phen = 1,10-phenanthroline have been synthesized and characterized by physic-chemical and spectroscopic methods. The solid-state structures of 1 and 2 were determined by single crystal X-ray crystallography, which revealed distorted square pyramidal geometry. In solid-state structure, 1 is self-assembled via intermolecular π.π stacking and the distances between centroids of aromatic ring is 3.525 Å. L1H2 is a diprotic tridentate Schiff base ligand having ONO donor site. Infrared spectra, ligand field spectra and magnetic susceptibility measurements agree with the observed crystal structures. The EPR spectra of these complexes in frozen DMSO solutions showed a single at g ca. 2. The trend in g-value (g|| > g ⊥ > 2.0023) suggests that the unpaired electron on copper (II) has dx2-y2 character. Copper (II) complexes 1-3 yielded an irreversible couple corresponding to the Cu (II)/Cu (I) redox process. Superoxide dismutase activity of all these complexes has been revealed to catalyze the dismutation of superoxide (O2-) and IC50 values were evaluated and discussed. Antimicrobial and antifungal activities of these complexes were also investigated. © 2013 Elsevier B.V. All rights reserved.

Yadav P.K.,National Institute of Technology, Patna
Meccanica | Year: 2013

This paper concerns the Slow Motion of a Porous Cylindrical Shell in a concentric cylindrical cavity using particle-in-cell method. The Brinkman's equation in the porous region and the Stokes equation for clear fluid in their stream function formulations are used. The hydrodynamic drag force acting on each porous cylindrical particle in a cell and permeability of membrane built up by cylindrical particles with a porous shell are evaluated. Four known boundary conditions on the hypothetical surface are considered and compared: Happel's, Kuwabara's, Kvashnin's and Cunningham's (Mehta-Morse's condition). Some previous results for hydrodynamic drag force and dimensionless hydrodynamic permeability have been verified. Variation of the drag coefficient and dimensionless hydrodynamic permeability with permeability parameter σ, particle volume fraction γ has been studied and some new results are reported. The flow patterns through the regions have been analyzed by stream lines. Effect of particle volume fraction γ and permeability parameter σ on flow pattern is also discussed. In our opinion, these results will have significant contributions in studying, Stokes flow through cylindrical swarms. © 2013 Springer Science+Business Media Dordrecht.

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