Department of Physics: Recent submissions
Now showing items 161-180 of 212
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Barium Titanate Ground- and Excited-State Properties from First-Principles Calculations
(American Physical Society, 2011-02-23)We present a comprehensive theoretical investigation of paraelectric (cubic) and ferroelectric (tetragonal) BaTiO3. The atomic and electronic structure, piezoelectric tensor, Debye temperature, zone center phonon frequencies, ... -
Impedance Spectroscopy Analysis of Double Perovskite Ho2NiTiO6
(Springer, 2010-12-01)The electrical properties of double perovskite Ho2NiTiO6 (HNT) are investigated by impedance spectroscopy in the temperature range 30-420 degrees C and frequency range 100 Hz to 1 MHz. The X-ray diffraction analysis reveals ... -
AC Conductivity and Dielectric Relaxation in Ba(Sm1/2Nb1/2)O-3 Ceramic
(Elsevier Science, 2011-01-15)The complex perovskite oxide a barium samarium niobate (BSN) synthesized by solid-state reaction technique has single phase with cubic structure. The scanning electron micrograph of the sample shows the average grain size ... -
Dielectric Relaxation of Complex Perovskite Sm(Ni1/2Zr1/2)O3
(Elsevier Science, 2010-11-01)Complexperovskiteoxidesamariumnickelzirconate,Sm(Ni1/2Zr1/2)O3 (SNZ), issynthesizedbyasolid- state reactiontechnique.X-raydiffractionofthesampleatroomtemperatureshowsamonoclinic phase.Impedancespectroscopyisusedtostudy ... -
Electrical Studies of Low Energy Ar9+ Irradiated Conducting Polymer PANI-PVA
(Pergamon-Elsevier Science, 2011-03)Polyaniline (PANI) prepared using water soluble support polymer polyvinyl alcohol (PVA) was subjected to irradiation with 150 keV Argon (Ar9+) ion at the fluence of 7.68 x 10(14) ion/cm(2) with beam current of 2 mu A ... -
QGP Susceptibilities from PNJL Model
(Indian Assoc Cultivation Science, 2011-01-01)An improved version of the PNJL model is used to calculate various thermodynamical quantities including Quark Number Susceptibility, Isospin susceptibility, specific heat, speed of sound and conformal measure. Comparison ... -
Explaining GRB in the Light of Energy Deposition Rate for v+ (v)over-bar -> e(+) + e(-) in a Compact Star
(Indian Assoc Cultivation Science, 2010-12-01)We have studied the e e energy deposition rate near a rotating compact star which is important for the study of gamma ray bursts (GRB). The General relativistic (GR) and rotational effects increase the efficiency of the ... -
Phenotypic Heterogeneity in Mycobacterial Stringent Response
(Biomed Central, 2011-01-27)Background: A common survival strategy of microorganisms subjected to stress involves the generation of phenotypic heterogeneity in the isogenic microbial population enabling a subset of the population to survive under ... -
Electronic Structure of Sr2AlNbO6: Dielectric and X-ray Photoemission Spectroscopy Study
(Japan Society of Applied Physics, 2010-06-21)The dielectric property and the electronic structure of double perovskite oxide strontium aluminium niobate, Sr2AlNbO6 (SAN), synthesised by a solid state reaction technique are investigated. The Rietveld refinement of ... -
Magnetic Structure of Double Perovskites Ca2MWO6 (M=Co, Ni): a First Principles Study
(Elsevier, 2010-07)First principles calculations have been performed to study the electronic and magneticstructures of doubleperovskites Ca2MWO6 (M=Co, Ni) using full potential linearized augmented plane wave method. The density of states ... -
First principles Study of Electronic Structure and Optical Properties of Double Perovskite Ba2(InM)O6 [View the MathML source, Ta]
(Elsevier, 2010-07-01)The structural, electronic and optical properties of double perovskite oxides Ba2(InNb)O6 and Ba2(InTa)O6 are investigated by full-potential linearized augmented plane wave method based on density functional theory under ... -
Correlation Between Conserved Charges in Polyakov–Nambu–Jona-Lasinio Model with Multiquark Interactions
(American Physical Society, 2011-01-20)We present a study of correlations among conserved charges like baryon number, electric charge and strangeness in the framework of 2 þ 1 flavor Polyakov loop extended Nambu–Jona-Lasinio model at vanishing chemical ... -
Susceptibilities with Multi-quark Interactions in PNJL Model
(The American Physical Society, 2010-12-29)We have investigated the fluctuations and the higher order susceptibilities of quark number, isospin number, electric charge and strangeness at vanishing chemical potential for 2+1 flavor Polyakov loop extended ... -
Dielectric Relaxation and Electronic Structure of Double Perovskite Ca2AlNbO6
(Taylor & Francis, 2010-12-01)The dielectric property and the electronic structure of calcium aluminium niobate, Ca2AlNbO6 (CAN) synthesized by solid state reaction technique are investigated. The field dependence of dielectric response, loss tangent ... -
Calibration of a Solid State Nuclear Track Detector (SSNTD) with High Detection Threshold to Search for Rare Events in Cosmic Rays
(Elsevier, 2011-06)We have investigated a commercially available polymer for its suitability as a solid state nuclear track detector (SSNTD). We identified that polymer to be polyethylene terephthalate (PET) and found that it has a higher ... -
Nucleation Efficiency of R134a as a Sensitive Liquid for Superheated Drop Emulsion Detector
(Springer, 2010-10-01)Superheated emulsion detector is known to detect neutrons, γ-rays and other charged particles. The present work includes the study of nucleation efficiency of superheated drops of one of the CFC-free liquids, R134a (C 2H ... -
Effects of Substitution of Titanium by Iron and Niobium on the Structure and Dielectric Properties in BaTi1- x(Fe0.5Nb0.5)xO3
(Taylor & Francis, 2010-12-01)Polycrystalline samples of BaTi1-x(Fe0.5Nb0.5)(x)O-3 with x=0, 0.03, 0.05, 0.1, 1 have been synthesized by high temperature solid state reaction technique. The effects of cationic substitution of iron and niobium for ... -
Aerosol Chemistry Over a High Altitude Station at Northeastern Himalayas, India
(PLoS One, 2010-06-16)Background: There is an urgent need for an improved understanding of the sources, distributions and properties of atmospheric aerosol in order to control the atmospheric pollution over northeastern Himalayas where rising ... -
Characterization and Calibration of a SSNTD for Heavy-ion Detection and Strangelet Search in Cosmic Rays
(Elsevier, 2011-01-15)A commercially available grade of polymer was investigated for its suitability as a solid state nuclear track detector (SSNTD) to look for rare events in cosmic rays at very high mountain altitudes. It was identified to ... -
Investigation of the phase diagram and bulk thermodynamic properties using the Polyakov–Nambu–Jona-Lasinio model with eight-quark interactions
(Amer Physical Soc, 2010-07-30)We present the bulk thermodynamic properties and phase diagram of strongly interacting matter in an extension of the 3-flavor Nambu-Jona-Lasinio(NJL) and Polyakov-Nambu-Jona-Lasinio(PNJL) models of QCD. Using a three-momentum ...