Vol. 2 & Issue 4 ; Section C : Physical Sciences

Date : Aug. to Oct.2012

 

Preparation and Characterization of Mn Doped NiCuZn ferrite.

B. D. Ingalea, M. A. Barotea

  • Abstract

    The ferrite composition [Ni0.25-xMn.xCu.2Zn0.55] Fe2O4 with values x= 0.00, 0.05, 0.1 were synthesized by auto combustion method. XRD analysis of prepared ferrite is varied from 22.3 to 39.3 nm the resultant powder were calcined at 650 0C/2hr and the pressed ferrite were sintered at 950 0C/4hr the initial permeability, dc resistivity were measured with frequency range 100Hz to 5MHz. The permeability is found to be increase up to x=0.1 and dc resistivity was decreased with Mn Substitution. The very high permeability in the composition x=0.1 was due to better densification and lower magnitostriction constant. The lattice parameter are also slightly increases from x=0 to=0.1. The composition is better than the NiCuZn based material. It is useful for Multilayer chip inductor.

Experimental Studies on Heat Transfer Using Plate Heat Exchanger

Jyoti K Javanjal and Madan Parande

  • Abstract

    A Plate Heat Exchangers is designed and fabricated. Experimental runs were conducted to study effect of parameters such as, properties of the fluid, flowrates, turbulence and temperature on the performance characteristics. The data presented is of industrial importance

A Theoretical Study of Alkali Doped Boron- Nitride (BN Fullerene) For Hydrogen Storage

V.K. Verma, Deepak kumar & L.K.Mishra

  • Abstract

    Using the theoretical formalism by N.S.Venkataramanan et.al1, we has studied the alkali doped Boron-nitride (BN) fullerene for hydrogen storage Due to increase threats from global warming, hydrogen holds tremendou promise as a new and clean energy options .Hydrogen is a convenient, safe, versatile fuel source that can be easily converted to a desired form of energy without releasing harmful emission. However, no material was found to satisfy the desired goals and hence there is hunt for new materials that can store hydrogen reversibly at ambient condition. We have observed that doping of transition elements reduce the gravimetric density of hydrogen. In case of alkali doped BN (Boron-nitride) the charge is transferred from dopant to nanocage. The binding energies of hydrogen on these systems were found to be in the range of 0.1eV to 0.2eV which are ideal for the practical application in a&

Comparative Study of Ternary Liquid Mixtures Containing Benzene and Substituted Benzene

Manoj Ku. Praharaj and Sarmistha Mishra

  • Abstract

    The ultrasonic velocity, density and viscosity have been measured for the ternary mixture of benzene, chloro-benzene, nitro-benzene and pyridine with N, N-dimethylformamide (DMF) in cyclohexane at different temperature, frequencies and concentration. The experimental data have been used for a comparative study of the molecular interaction in the different mixtures using the parameters, molar volume, available volume, free volume, surface tension, Rao’s constant, Wada’s constant, Vander wall’s constant and excess values of some parameter’s such as excess density, excess viscosity, excess velocity, excess free volume, excess Gibb’s free energy and excess surface tension.

Study of Condensed Matter in Super Strong Magnetic Field and Estimation of Its Binding 

Brajesh Kr. Tiwary, S. P. Tiwary, and L. K. Mishra

  • Abstract

    Binding energies and exchange energies of hydrogen helium, carbon and oxygen matter were evaluated in a superstrong magnetic field. The evaluated is performed by theoretical formalism of Skjervold and φ stgaard using three adjustable parameter η, R (a0), l(a0). Our theoretical results indicate that inclusion of exchange energies enhances the binding energies and this enhancement is more pronounced in lower value of z.

A theoretical Study of Heavy Electron Compounds and an evaluati

Jyotsana Jyot, V. K. Verma & L. K. Mishra

  • Abstract

    Using the theoretical formalism of A. M. Awasthi et al. (1989 and 1993) we have presented a method of evaluation of frequency dependent optical scattering rate Ѓ(ω) and the effective mass m mb * (ω ) of heavy electron compound CeAl3. Two plasmon frequency ωp (unrenormalised) and ω*p (renormalized) for some of the heavy compounds are also evaluated. Our theoretical results are in good agreemen with the experimental data and other theoretical workers

Study of condensed Matter in super strong magnetic field and es

Brajesh Kr. Tiwary, S. P. Tiwary and L. K. Mishra

  • Abstract

    Binding energies of Hydrozen, Helium, Carbon and Oxygen matter were evaluated without taking exchange energy term in a super strong magnetic field. The evaluation has been performed by theoretical formalism of Skjervold and φstgaard using three adjustable parameter η,R(a0), l(a0). Our results are in good agreement with these of the other workers.

Atomic Scale Simulation of Extended Defects Formation in Irradi

E Boucetta, A Amgha and H Idrissi-saba

  • Abstract

    The atomic scale simulation (ASS) of the diffusion and agglomeration of point defects under high energy irradiation 16-19 has been resumed to account for the influence of the impurities and pre-existing dislocations on the process of defects formation. Five types of reactions are assumed to take place: vacancy-interstitial recombination, interstitial-interstitial association to form a new extended defect, interstitial-extended defect reaction leading to growth of extended defects, interstitialimpurity reaction leading to the nucleation of the impurity, interstitial-pre-existing dislocation reaction leading to the growth of this letter. In the simulation only interstitials are mobile and extended defects are assumed to be dislocation loops in the (0,0,1) planes. The concentrations and the means radius of various defects produced were calculated and the variation induced in these concentrations b

A Theoretical Study of Condensed Matter in Super Strong Magneti

L. P. Mishra and L.K. Mishra

  • Abstract

    We have evaluated cohesive energies of hydrogen, helium, carbon, oxygen,silicon and Iron matter in the presence of super strong magnetic field. Our theoretical results indicate that cohesive energies increase with increase of magnetic field strength B. The increase is small for smaller value of z and becomes larger and larger for higher Z values. Our theoretical results are in good agreement with other theoretical workers

Thermo-Transport Properties of Copper Sulphate, as a Function o

S K Lomesh and Munish Thakur

  • Abstract

    The density (ρ) and viscosity (η) has been measured for CuSO4.5H2Oin 0.01m aqueous NaCl and in 2, 4 and 6% Mannitol + 0.01m NaCl + water as multicomponent solvent systems, at temperatures T = (303.15, 308.15, 313.15, and 318.15) K and at atmospheric pressure p = 0.1 MPa. The experimental data was further used to calculate various thermodynamic and transport properties of CuSO4.5H2Oincluding apparent molar volume , partial molar volume ( at infinite dilution, partial molar volume of transfer Jone Dole parameters A and B, temperature dependence of B coefficient dB/dT, activation free energy per mole for solvent (kj mol-1) and activation free energy per mole for solution (kj mol-1). The ion–solvent and ion–ion interactions in CuSO4.5H2Oin0.01m aqueous Na Clas well as different multi component solvent system have been discussed using these p

A Theoretical Study of Coherent To Incoherent Dynamical Behavio

Mirtunjay Sharma and Lalit Kumar Mishra

  • Abstract

    In series of experiments in 1995, alkali atomic gases were cooled down to nK temperature and BEC (Bose-Einstein Condensation) was observed. Using the theoretical formalism developed by M.M.Cerimele etal (2004), we have studied the coherent to incoherent dynamical behavior of quantum atomic gases in periodic potentials. We have evaluated oscillation of condensate incoherent dynamics of the condensate and chaotic dynamics of the condensate. Our evaluated theoretical results are in good agreement with other theoretical workers.

Study on Dielectric Behaviour of Waxes in p-band region

M. Lakshmi Pravaa ,Adeel Ahmeda

  • Abstract

    A study on electric properties such as dielectric constant, dielectric loss, electric conductivity, and the penetration depth is conducted in the p-band microwave frequency range, of 12.4 GHz to 18.0 GHz for the solid samples of bees wax (BW), paraffin wax (PW) & microcrystalline wax (MW). The transmission line technique using vector network analyzer (VNA) is employed in the study. The dielectric properties of different waxes in their normal condition and after heat treatment are investigated. The study reveals that the conductivity and dielectric loss decreases after heat treatment with respect to frequency.

Densities, Ultrasonic velocities and Excess properties of Binary mixture of 1, 4-Dioxane + 1

Anil Kumar K , Srinivasu Ch  and Raju KTSS

  • Abstract

    Ultrasonic velocity and densities for 1,4-Dioxane with 1-Butanol are measured using an Anton - Paar DSA 5000 M densimeter at temperature range 298.15 -318.15 K at an interval of 5K and atmospheric pressure over the whole concentration range. The measured values of u and ρ are used to calculate adiabatic compressibility, Intermolecular free length, molar volume, Specific acoustic impedance and their excess parameters respectively. The results are discussed for the inter molecular interactions and finally, coefficients are calculated using Redlich- Kister equation.

A Theoretical Evaluation of Scattering Length for Two Coupled S

Deepak Kumar, J. P. Choudhary, Ashok Kumar &L.K. Mishra

  • Abstract

    Using the theoretical Formalism of Y. Ohashi and A. Griffin, Phys. Rev A67 (2003), we have evaluated the scattering length and effective range of an attractive square well potential for ultracold atomic gases. We have also evaluated the energy of the bound state Em. Our theoretical results show that for any potential with large positive scattering length has a bound state just below the continuum threshold of energy given by Em. Our theoretically evaluated results are in good agreement with other theoretical workers.

A Theoretical Study of Ultrafast Quasi-Particle Relaxation Time

D. Prasad, P.C. Sharma, and L.K. Mishra

  • Abstract

    Ultrafast quasi-particle relaxation dynamics for normal metal and heavyfermion material have been studied. Using the theoretical model developed by K. H. Ahn et. al. (2004) which is based on Two- Temperature model (TTM) and coupled Boltzmann equation, an evaluation of relaxation time τ for LuAgCu4 metal and heavy-fermion YbAgCu4 have been performed. For normal metal at low temperature electron distribution gives temperature independent relaxation time where as TTM predicts τ~ T-3 behavior. For heavy-fermion material with peak DOS at EF, relaxation time shows τ ~ T-1 at low T. Our theoretically evaluated results are in good agreement with the experimental data and also with other theoretical workers

An Evaluation of Critical Temperature for Bose- Einstein Conden

Indu Kumari Tiwari, R. N. Jha and L. K. Mishra

  • Abstract

    Using theoretical formalism of R. A. Duine and H. T. C. Stoof (Physics Reports, 2004) we have evaluated the critical temperature TC for Bose-Einstein condensation (BEC) for the atom-molecule mixture at the fixed total density. The evaluation has been performed for positive and negative detuning. For positive detuning, we obtained TBEC =T0 and for negative detuning, we have TBEC =(2-5/3T0) where T0 is initial temperature. Our theoretically evaluated results are in

An evaluation of Temperature Dependent Energy Gap Parameter for Organic Superconductor

Afshan Suraiya and L. K. Mishra

  • Abstract

    Using BCS- theory, we have evaluated the temperature dependent energy gapparameter Δ(T) of organic superconductors having TC between 10K to 12K. Our theoretically evaluated results are in good agreement with the experimental data and also with other theoretical workers.

A Theoretical Study of Imblanced D-Wave Super Fluids in BCS-BEC Crossover Regime

Tushar Kumar Mohanta, V. K. Verma and L. K. Mishra

  • Abstract

    Using the theoretical formalism of J. Tempere etal.(Phys. Rev. 2008), we have studied the imbalanced d-wave super fluids in the BCS-BEC cross over regime. We have theoretically evaluated the critical temperature Tc and saddle-point critical temperature T* as a function of inverse scattering length for different values of d-wave scattering potential parameter k0 and k1. Our theoretically evaluated results are in good agreement with the experimental data and also with other theoretical workers

A Theoretical Study of Pressure-Induced Non-Fermi Liquid B

S. R. Vittal, Mirza Abbas Hussain and L. K. Mishra

  • Abstract

    Using the empirical formula based on multichannel Kondo model and Disorderinduced non-Fermi -liquid model, we have theoretically analyzed the data of (ΔC/T) and (C/T) results of two non-Fermi-liquid materials. Our theoretically analyzed results are in good agreement with the experimental data and also with other theoretical workers.

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