Mb Khalsa College

Indore, India

Mb Khalsa College

Indore, India

Time filter

Source Type

Rajput V.,Mb Khalsa College | Bhat K.S.,Microwave Tube Research and Development Center | Maheswari K.P.,University of Kota
Journal of Physics: Conference Series | Year: 2012

One interesting method of microwave pulse compression is passive-frequency-based microwave pulse compression where a dispersive medium is used to compress a frequency swept pulse. Oversized circular waveguide having helical corrugation supports eigenmodes that are suitable for pulse compression for frequency modulated input pulse is as shown by Brat et.al. [IEEE Trans. Plasma Sci., vol. 33, no.2, pp. 661-667, 2005.]. In this paper, theoretical studies on microwave pulse compression in helically corrugated waveguide is presented. The numerical results show a eleven fold peak power compression. © Published under licence by IOP Publishing Ltd.


Varshney D.,Devi Ahilya University | Dagaonkar G.,Devi Ahilya University | Varshney M.,Mb Khalsa College
Materials Research Bulletin | Year: 2010

Using a phenomenological lattice model incorporating the long-range Coulomb and charge transfer caused by the deformation of the electron shells of the overlapping ions and the Hafemeister and Flygare type short-range overlap repulsion extended upto the second neighbor ions and the van der Waals (vdW) interaction, we present a comprehensive study to understand the effects of pressure on the elastic behavior as ductility (brittleness) and thermodynamical properties of Ga1-xInxP. Estimated phasetransition pressure and the vast volume discontinuity in pressure-volume phase diagram confirm the structural phase transition from zinc blende (B3) to rock salt (B1) phase. From the elastic constants the Poisson's ratio n, the ratio R S/B of S (Voigt averaged shear modulus) over B (bulk modulus), elastic wave velocity, average wave velocity and thermodynamical property Debye temperature is calculated. The Poisson's ratio n and the ratio RS/B allows one to conclude that Ga1-xInxP is brittle in zinc blende (B3) and ductile nature is inferred in sodium chloride (B1) phase. To our knowledge this is the first quantitative theoretical prediction of the doping and pressure dependent elastic properties for mixed valent Ga1-xInxP compounds and still awaits experimental confirmations. © 2010 Elsevier Ltd. All rights reserved.


Varshney D.,Devi Ahilya University | Joshi G.,Devi Ahilya University | Varshney M.,Mb Khalsa College | Shriya S.,Devi Ahilya University
Physica B: Condensed Matter | Year: 2010

By formulating an effective interionic interaction potential that incorporates the long-range Coulomb, the covalency effects, the charge transfer caused by the deformation of the electron shells of the overlapping ions, the Hafemeister and Flygare type short-range overlap repulsion extended upto the second neighbour ions and the van der Waals (vdW) interaction, the pressure dependent elastic and thermodynamical properties of the III-V antimonide semiconductors as YSb (Y=B, Al, Ga, and In) are investigated. Estimated values of phase transition pressure of YSb antimonides are consistent with the available data on the phase transition pressures. The ratio RS/B of S (Voigt averaged shear modulus) over B (bulk modulus), elastic wave velocity, average wave velocity and Debye temperature as functions of pressure is calculated. From the ratio RS/B it is inferred that YSb (Y=Al, Ga, and In) are ductile and BSb is brittle in zinc blende (B3) phase. To our knowledge this is the first quantitative theoretical prediction of the ductile (brittle) nature of YSb antimonides and still awaits experimental confirmations. © 2009 Elsevier B.V. All rights reserved.


Kelotra S.,Mb Khalsa College | Jain M.,Devi Ahilya University | Kelotra A.,Devi Ahilya University | Jain I.,In silico Research Laboratory | And 3 more authors.
Asian Pacific Journal of Cancer Prevention | Year: 2014

Apoptosis is a general phenomenon of all multicellular organisms and caspases form a group of important proteins central to suicide of cells. Pathologies like cancer, Myocardial infarction, Stroke, Sepsis, Alzheimer's, Psoriasis, Parkinson and Huntington diseases are often associated with change in caspase 3 mediated apoptosis and therefore, caspases may serve as potential inhibitory targets for drug development. In the present study, two series of synthetic acetylated tetrapeptides containing aldehyde and fluromethyl keto groups respectively at the C terminus were proposed. All these compounds were evaluated for binding affinity against caspase 3 structure. In series 1 compound Ac-DEHD-CHO demonstrated appreciable and high binding affinity (Rerank Score: -138.899) against caspase 3. While in series 2 it was Ac-WEVD-FMK which showed higher binding affinity (Rerank Score: -139.317). Further these two compounds met ADMET properties and demonstrated to be non-toxic.


Varshney M.A.,Mb Khalsa College | Sen S.,Rishiraj Institute of Technology | Sen S.,Devi Ahilya University | Rathore B.,Mb Khalsa College | And 2 more authors.
Optik | Year: 2011

This paper presents an analytical and numerical investigation of an intense circularly polarized wave propagating along the static magnetic field parallel to oscillating magnetic field in magnetoactive plasma. In the relativistic regime such a magnetic field is created by pulse itself. The authors have studied different regimes of propagation with relativistic electron mass effect for magnetized plasma. An appropriate expression for dielectric tensor in relativistic magnetoactive plasma has been evaluated under paraxial theory. Two modes of propagation as extraordinary and ordinary exist; because of the relativistic effect, ultra-strong magnetic fields are generated which significantly influence the propagation of laser beam in plasma. The nature of propagation is characterized through the critical-divider curves in the normalized beam width with power plane For given values of normalized density (ωp/ω) and magnetic field (ωc/ω) the regions are namely steady divergence (SD), oscillatory divergence (OD) and self-focusing (SF). Numerical computations are performed for typical parameters of relativistic laser-plasma interaction: magnetic field B = 10-100 MG; intensity I = 1016 to 1020 W/cm2; laser frequency ω = 1.1 × 1015 s-1; cyclotron frequency ωc = 1.7 × 1013 s-1; electron density ne = 2.18 × 1020 cm-3. From the calculations, we confirm that a circularly polarized wave can propagate in different regimes for both the modes, and explicitly indicating enhancement in wave propagation, beam focusing/self-guiding and penetration of E-mode in presence of magnetic field. © 2010 Elsevier GmbH. All rights reserved.


Varshney D.,Devi Ahilya University | Joshi G.,Devi Ahilya University | Varshney M.,Mb Khalsa College | Shriya S.,Devi Ahilya University
Journal of Alloys and Compounds | Year: 2010

By formulating an effective interionic interaction potential that incorporates the long-range Coulomb, the covalency effects, the charge transfer caused by the deformation of the electron shells of the overlapping ions, the Hafemeister and Flygare type short-range overlap repulsion extended up to the second neighbour ions and the van der Waals (vdW) interaction, the pressure dependent elastic and thermodynamical properties of the III-V semiconductors as GaY (Y = N, P, As) are studied. The estimated values of phase transition pressure of GaY (Y = N, P, As) are in reasonably good agreement with the available data on the phase transition pressures (Pt = 41, 22, 17 GPa). The vast volume discontinuity in pressure-volume phase diagram identifies a structural phase transition from zinc-blende (B3) to rock salt (B1) structure. Later on, the Poisson's ratio ν, the ratio RS/B of S (Voigt averaged shear modulus) over B (bulk modulus), elastic anisotropy parameter, elastic wave velocity, average wave velocity and Debye temperature as functions of pressure is calculated. From Poisson's ratio and the ratio RS/B it is inferred that GaY (Y = N, P, As) is brittle [ductile] in zinc-blende (B3) [Sodium Chloride (B1)] phase. To our knowledge this is the first quantitative theoretical prediction of the pressure dependence of ductile (brittle) nature of GaY compounds and still awaits experimental confirmations. © 2010 Elsevier B.V. All rights reserved.


Varshney D.,Devi Ahilya University | Joshi G.,Devi Ahilya University | Varshney M.,Mb Khalsa College | Shriya S.,Devi Ahilya University
Solid State Sciences | Year: 2010

The elastic and thermodynamical properties of the III-V semiconductors as BY (Y = N, P, As) are calculated in zincblende and NaCl phases by formulating an effective interionic interaction potential. This potential consists of the long-range Coulomb, the Hafemeister and Flygare type short-range overlap repulsion extended up to the second neighbour ions and the van der Waals (vdW) interaction. The variations of elastic constants with pressure follow a systematic trend identical to that observed in other compounds of ZnS type structure family and the Born relative stability criteria is valid in boron monopnictides. From the elastic constants the Poisson's ratio ν, the ratio RS/B of S (Voigt averaged shear modulus) over B (bulk modulus), elastic wave velocity, average wave velocity and thermodynamical property Debye temperature are calculated. By analyzing the Poisson's ratio ν and the ratio RS/B we conclude that at low pressures the boron monopnictides are brittle in nature in ZnS phase and ductile nature at high pressures in both ZnS and NaCl phases. To our knowledge this is the first quantitative theoretical prediction of the pressure dependence of ductile (brittle) nature of BY compounds. © 2010 Elsevier Masson SAS. All rights reserved.


Mishra A.,Devi Ahilya University | Sharma R.,Mb Khalsa College | Shrivastava B.D.,P.A. College | Mishra N.,Devi Ahilya University
Journal of Physics: Conference Series | Year: 2012

The present paper deals with the spectroscopic studies of transition metal complexes of copper and iron. Metal complexes are characterized by XRD, FTIR, Mössbauer and VSM (Vibrating sample magnetometer) measurements. The XRD analysis reveals the crystalline nature of both compounds. Mössbauer study interprets paramagnetic nature of iron complex at room temperature. VSM measurements also reveal the paramagnetic nature of iron complex at higher temperature range, while it follows magnetic phase transition from paramagnetic to antiferromagnetic nature at low temperature. © Published under licence by IOP Publishing Ltd.


Varshney D.,Devi Ahilya University | Shriya S.,Devi Ahilya University | Varshney M.,Mb Khalsa College | Khenata R.,University of Mascara
Computational Materials Science | Year: 2012

A theoretical study of the elastic properties in EuX (X = O, S, Se, Te) using an effective interionic interaction potential in which long-range Coulomb as well charge transfer interactions, Hafemeister and Flygare type short-range overlap repulsion extended up to the second neighbor ions and van der Waals interactions are considered. Emphasis is on the evaluation of the pressure dependent Poisson's ratio ν, the ratio R G/B of G (shear modulus) over B (bulk modulus), anisotropy parameter, Shear and Young's modulus, Lame constant, Klein man parameter, elastic wave velocity and thermodynamical property as Debye temperature. The Poisson's ratio behavior infers that europium chalcogenides are brittle in nature. To our knowledge this is the first quantitative theoretical prediction of the pressure dependence of elastic, and thermodynamical properties explicitly the ductile (brittle) nature of EuX and still awaits experimental confirmations. © 2012 Elsevier B.V. All rights reserved.


Varshney D.,Devi Ahilya University | Sapkale R.,Devi Ahilya University | Dagaonkar G.J.,Devi Ahilya University | Varshney M.,Mb Khalsa College
Journal of Physics and Chemistry of Solids | Year: 2011

A theoretical study of the elastic properties in diluted magnetic semiconductors Hg1-xMnxS (x=0.02 and 0.07) using an effective interionic interaction potential (EIoIP) in which long-range Coulomb interactions, charge transfer mechanism (three body interaction) and the Hafemeister and Flygare type short-range overlap repulsion extending up to the second neighbor ions and the van der Waals (vdW) interaction is considered. Particular attention is devoted to evaluate Poissons ratio ν, the ratio RS/B of S (Voigt averaged shear modulus) over B (bulk modulus), elastic anisotropy parameter, elastic wave velocity, average wave velocity and thermodynamic property as Debye temperature is calculated. By analyzing Poissons ratio ν and the ratio RS/B we conclude that Hg 1-xMnxS is brittle in zinc blende (B3). To our knowledge this is the first quantitative theoretical prediction of the pressure dependence of ductile (brittle) nature of Hg1-xMnxS compounds and still awaits experimental confirmations. © 2011 Elsevier Ltd.

Loading Mb Khalsa College collaborators
Loading Mb Khalsa College collaborators