Bhāgalpur, India
Bhāgalpur, India

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Nath K.A.,Tilka Manjhi Bhagalpur University | Prasad K.,Tilka Manjhi Bhagalpur University | Prasad K.,Central University of Jharkhand | Chandra K.P.,Tilka Manjhi Bhagalpur University | And 3 more authors.
Bulletin of Materials Science | Year: 2013

Impedance and electrical conduction studies of Ba(Pr1/2Nb 1/2)O3 ceramic prepared through conventional ceramic fabrication technique are presented. The crystal symmetry, space group and unit cell dimensions were estimated using Rietveld analysis. X-ray diffraction analysis indicated the formation of a single-phase cubic structure with space group, Pm3m. EDAX and SEM studies were carried out to study the quality and purity of compound. To find a correlation between the response of the real system and idealized model circuit composed of discrete electrical components, the model fittings were presented using impedance data. Complex impedance as well as electric modulus analyses suggested dielectric relaxation to be of non-Debye type and negative temperature coefficient of resistance character. The correlated barrier hopping model was employed to successfully explain the mechanism of charge transport in Ba(Pr1/2Nb1/2)O 3. The a.c. conductivity data were used to evaluate density of states at Fermi level, minimum hopping length and apparent activation energy. © Indian Academy of Sciences.


Suraj M.S.,University of Delhi | Hassan M.R.,Sm College
Astrophysics and Space Science | Year: 2014

An analytical study of the elliptic Sitnikov restricted four-body problem when all the primaries as source of same radiation pressure is presented. We find a solution, which is valid for small bounded oscillations in case of moderate eccentricity of the primary. We have linearized the equation of motion to obtain the Hill's type equation. Using the Courant and Snyder transformation, Hill's equation transformed into harmonic oscillator type equation.We have used the Lindstedt-Poincare perturbation method and again we have applied the Courant and Snyder transformation to obtain the final result. © Springer Science+Business Media Dordrecht 2013.


The Complexes of Ti(iii), V(iii), Mn(iii), Co(iii), Ru(iii), Ru(ii), MoO(v), Fe(iii), MoO2(vi) and UO2(vi) with S-benzyl-β-N-(2-hydroxy-5-bromophenyl) methylendithiocarbazate have been synthesized and characterised by melting points, molar conductance,magnetic susceptibility, electronic and IR spectral studies. The complexes of Ti(iii), V(iii), Mn(iii), Ru(iii) & MoO(v) are paramagnetic while all other complexes are diamagnetic. Based on these studies octahedral geometry have been proposed for all the complexes. The ligand and its metal complexes have been screened for antimicrobial activities.


Prasad K.,Tilka Manjhi Bhagalpur University | Bhagat S.,Tilka Manjhi Bhagalpur University | Priyanka,Tilka Manjhi Bhagalpur University | Amarnath K.,Tilka Manjhi Bhagalpur University | And 2 more authors.
Physica B: Condensed Matter | Year: 2010

Lead-free perovskite BaY0.5Nb0.5O3 was prepared by conventional ceramic technique at 1375 °C/7 h in air atmosphere. The crystal symmetry, space group and unit cell dimensions were derived from the experimental results using FullProf software. XRD analysis of the compound indicated the formation of a single-phase cubic structure with the space group Pm3m. EDAX, X-ray mapping and SEM studies were carried to study the quality and purity of the compound. Complex impedance analyses suggested the dielectric relaxation to be of non-Debye type. To find a correlation between the response of the real system and idealized model circuit composed of discrete electrical components, the model fittings were presented using the impedance data. Electric modulus studies supported the hopping type of conduction in BaY 0.5Nb0.5O3. The correlated barrier hopping model was employed to successfully explain the mechanism of charge transport in BaY0.5Nb0.5O3. The ac conductivity data were used to evaluate the density of states at Fermi level, minimum hopping length and apparent activation energy of the compound. © 2010 Elsevier B.V. All rights reserved.


Parida S.,SM College | Panda M.,L. N Mahavidyalaya | Parija A.,Salipur College | Das S.C.,Salipur College
Research Journal of Pharmaceutical, Biological and Chemical Sciences | Year: 2014

The objective of this study is to evaluate the thermal properties of agro waste reinforced novolac composites derived from bagasse or cane chaff (CC), aloe vera (AV) and rice husk (RH) for potential applications as heat resistant and flame retardant materials. In this investigation the three bio polymeric composites were prepared by condensation method with weight ratio 1:1 (resin: biomass). Various spectral techniques like FTIR and SEM are employed for structural confirmation of composites. The thermal stability, flame retardancy and thermal degradation mechanism of the composites with different biomass have been evaluated by thermo gravimetric analysis (TGA). It is observed that bio composite of novolac prepared with rice husk has remarkably higher thermal stability and improved flame retardancy in comparison with the other two eco composites.


The ligand derived from 1-phenyl-2, 3-dimethyl-4-(4-iminopentan-2-one)- pyrazolin-5-one and 2-aminophenol behaved in neutral tetra dentate manner. Its complexes with Ti (III), V (III), Mn (III), Ru (III), MoO (V), MoO2 (VI), and UO2 (VI) were prepared and characterized by elemental analysis, conductivity, magnetic studies and spectral data. Based on these studies octahedral geometry has been proposed for all these complexes. The ligand and selected transition metal complexes have also been evaluated for antimicrobial activity against S. aureus and B. subtilis. From the biological data, we can infer that Schiff base of 4-aminoantipyrin has better antimicrobial activity in comparison to the native one. Also, the antimicrobial activity is highly influenced by the nature of the metal ion. The order of antibacterial activities against S. aureus and B. subtilis are MoO (V) > MoO2 (VI) > UO2 (VI) H" Ru (III) > Mn (III) > V (III) > Ti (III) and Mn (III) > MoO (V) > MoO2 (VI) > Ru (III) > UO2 (VI) > V (III) > Ti (III) respectively.


Prasad K.,Tilka Manjhi Bhagalpur University | Priyanka,Tilka Manjhi Bhagalpur University | Chandra K.P.,Sm College | Kulkarni A.R.,Indian Institute of Technology Bombay
Journal of Non-Crystalline Solids | Year: 2011

Lead-free perovskite Ba(In1/2Nb1/2)O3 was prepared by conventional ceramic fabrication technique at 1350 °C/5 h in air atmosphere. The crystal symmetry, space group and unit cell dimensions were determined from Rietveld analysis using FullProf software whereas crystallite size and lattice strain were estimated from Williamson-Hall approach. XRD analysis of the compound indicated the formation of a single-phase cubic structure with the space group Pm3m. EDAX and SEM studies were carried out in order to evaluate the quality and purity of the compound. Complex impedance as well as electric modulus analyses suggested the dielectric relaxation to be of non-Debye type. The correlated barrier hopping (CBH) model was employed to successfully explain the mechanism of charge transport in Ba(In 1/2Nb1/2)O3. © 2010 Elsevier B.V. All rights reserved.


Prasad K.,Tilka Manjhi Bhagalpur University | Chandra K.P.,Sm College | Bhagat S.,Tilka Manjhi Bhagalpur University | Choudhary S.N.,Tilka Manjhi Bhagalpur University | Kulkarni A.R.,Indian Institute of Technology Bombay
Journal of the American Ceramic Society | Year: 2010

Lead-free perovskite Ba(Al1/2Nb1/2)O3 was prepared by conventional ceramic fabrication technique at 1350°C/5 h in air atmosphere. The crystal symmetry, space group and unit cell dimensions were determined from the experimental results using FullProf software whereas crystallite size and lattice strain were estimated from Williamson-Hall approach. X-ray diffraction analysis of the compound indicated the formation of a single-phase monoclinic structure with the space group P2/m. EDAX and SEM studies were carried out in order to evaluate the quality and purity of the compound. Permittivity data showed low-temperature coefficient of capacitance (TCC=14%) up to 100°C. To find a correlation between the response of the real system and idealized model circuit composed of discrete electrical components, the model fittings were presented using the impedance data. Complex impedance analyses suggested the dielectric relaxation to be of non-Debye type. The correlated barrier-hopping model was used to successfully explain the mechanism of charge transport in Ba(Al1/2Nb1/2)O 3. © 2009 The American Ceramic Society.


Prasad K.,Tilka Manjhi Bhagalpur University | Amar Nath K.,Tilka Manjhi Bhagalpur University | Bhagat S.,Tilka Manjhi Bhagalpur University | Chandra K.P.,Sm College | Kulkarni A.R.,Indian Institute of Technology Bombay
Advances in Applied Ceramics | Year: 2010

Abstract Lead free perovskite Ba(La1/2Nb1/2)O 3 was prepared by conventional ceramic fabrication technique at 1375°C for 7 h in air atmosphere. The crystal symmetry, space group and unit cell dimensions were estimated using Rietveld analysis. X-ray diffraction analysis indicated the formation of a single phase monoclinic structure with space group P2/m. Energy dispersive X-ray analysis and scanning electron microscopy studies were carried to study the quality and purity of the compound. Permittivity data showed low temperature coefficient of capacitance (T CC = 11%) up to 100°C. The circuit model fittings were carried out using the impedance data to find the correlation between the response of real system and idealised model electrical circuit. Complex impedance analyses suggested the dielectric relaxation to be of non-Debye type. The correlated barrier hopping model was employed to successfully explain the mechanism of charge transport in Ba(La1/2Nb1/2)O3. The AC conductivity data were used to evaluate the density of states at Fermi level, minimum hopping length and apparent activation energy. © 2010 Institute of Materials, Minerals and Mining Published by Maney on behalf of the Institute.


Shahbaz Ullah M.,Tilka Manjhi Bhagalpur University | Hassan M.R.,Sm College
Astrophysics and Space Science | Year: 2014

In this manuscript we have established averaged equation of motion of the Sitnikov restricted three- body and four-body problem when all the primaries are point masses, by applying the Van der Pol transformation and averaging technique of J. Guckenheimer and P. Holmes (in Nonlinear Oscillations, Dynamical System Bifurcations of Vector Fields, Springer, Berlin, 1983). In addition to the resonance criterion at the 3/2 commensurability we have chosen ω=2n/3,n=4, ω is the angular velocity of the coordinate system. Further we established the Series solution of the three-body and four-body problem in the sense of Sitnikov. Lastly the periodicities of the solutions have been examined by the Poincare section and four-body and three-body problem have been compared by different comparative graphs and surfaces. © 2014 Springer Science+Business Media Dordrecht.

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