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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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 | Dutta A.,Bose Institute of India | Sinha T.P.,Bose Institute of India
Physica B: Condensed Matter | Year: 2011

Double perovskite oxide holmium zinc zirconate Ho2ZnZrO 6 (HZZ) is synthesized by solid state reaction technique under a calcination temperature of 1100°C. The crystal structure has been determined by powder X-ray diffraction, which shows monoclinic phase at room temperature. The variation of dielectric constant (ε′) and loss tangent (tan δ) with frequency is carried out assuming a distribution of relaxation times. The frequency corresponding to loss tangent peak is found to obey an Arrhenius law with activation energy of 89.7 meV. The frequency-dependant electrical data are analyzed in the framework of conductivity and electric modulus formalisms. Both these formalisms show qualitative similarities in relaxation times. The scaling behaviour of imaginary electric modulus shows the temperature-independent nature of the distribution of relaxation times. Nyquist plots are drawn to identify an equivalent circuit and to know the bulk and interface contributions. © 2011 Elsevier B.V. All rights reserved.


Mahato D.K.,National Institute of Technology, Patna | Dutta A.,Bose Institute of India | Sinha T.P.,Bose Institute of India
Solid State Sciences | Year: 2012

A new double perovskite oxide holmium magnesium zirconate Ho 2MgZrO 6 (HMZ) was prepared by solid state reaction technique. The crystal structure has been determined by powder X-ray diffraction which shows monoclinic phase at room temperature with cell parameters a = 9.3028 ± 0.0030 , b = 5.2293 ± 0.0008 , c = 4.4009 ± 0.0009 , β = 103.3746 ± 0.0166°. An analysis of complex permittivity with frequency was carried out assuming a distribution of relaxation times. The frequency dependent electrical data are analyzed in the framework of conductivity and electric modulus formalisms. At the high temperature range, conductivity data satisfy the variable range hopping (VRH) model. In this regime, the conductivity of sample obeys Mott's T 1/4 law, characteristic of VRH. High temperature data indicates the formation of thermally activated small polarons. The scaling behaviour of imaginary part of electric modulus suggests that the relaxation describes the same mechanism at various temperatures. © 2011 Elsevier Masson SAS. All rights reserved.


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.


Tripathy B.,KIIT University | Dash S.,Siksha ‘O’ Anusandhan University | Padhy S.K.,National Institute of Technology, Patna
Computers and Industrial Engineering | Year: 2015

In this paper, we designed novel methods for Neural Network (NN) and Radial Basis function Neural Networks (RBFNN) training using Shuffled Frog-Leaping Algorithm (SFLA). This paper basically deals with the problem of multi-processor scheduling in a grid environment. We, in this paper, introduce three novel approaches for the task scheduling problem using a recently proposed Shuffled Frog-Leaping Algorithm (SFLA). In a first attempt, the scheduling problem is structured as a problem of optimization and solved by SFLA. Next, this paper makes use of SFLA trained Artificial Neural Network (ANN) and Radial Basis function Neural Networks (RBFNN) for the problem of task scheduling. Interestingly, the proposed methods yield better performance than contemporary algorithms as evidenced by simulation results. © 2014 Elsevier Ltd. All rights reserved.


Sharma B.K.,National Institute of Technology, Patna
AEU - International Journal of Electronics and Communications | Year: 2014

The analytical design of differential amplifiers, the building blocks of an op-amp, requires an elegant, handy and computationally simple experimental method of measuring the d.c.super-gain of these blocks. This paper presents such an oscillation based test (OBT) by putting the Op.Amp. under test in the close loop of state variable filter. The oscillation frequency of the linearized system directly yields the d.c. open loop gain, the dominant pole and the second order non-dominant pole of test Op.Amp. The d.c. open loop gain of DUT is further authenticated by a novel method of frequency domain analysis using a super attenuator. The authentication is positive with 95 percent confidence level (0 percent, 9.64 percent) thereby establishing the validity of OBT method. © 2014 Elsevier GmbH.


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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