Vol. 5 & Issue 2 ; Section C : Physical Sciences

Date : Feb. 2015 to April 2015

 

A theoretical evaluation of energy of trapped polaritons, dependence of density of states on normalized polariton energy and critical temperature TC as a function of LB polariton number for trapped atomic polariton in a biconical waveguide cavity

Shapla Kumari, Narendra Singh & Lalit Kumar Mishra

  • Abstract

    Using, the theoretical formalism of I. Yu. Chestnov etal. (2012), we have studied BEC for trapped atomic polaritons in a biconical waveguide cavity. We have theoretically evaluated density of states ρ(ε) as a function of energy using two potential (a) an exact trapping potential U(z) and (b) power law potential U(z)ν for different trapping power parameter ν. We have also evaluated critical temperature TC of trapped atomic polaritons. Our estimated values of TC is quite large (TC>530K) which shows that trapped polariton behaves photon-like character due to their low effective mass. Our theoretically evaluated results are in good agreement with other theoretical workers.

Peristaltic Flow of A Couple Stress Fluids through a Porous Medium in an Inclined Channel

V.P.Rathod and N.G.Sridhar

  • Abstract

    The present paper investigates the peristaltic motion of a couple stress fluid through a porous medium in a two dimensional inclined channel. The effects of various physical parameters on velocity, pressure gradient and friction force have been discussed & computed numerically. The effects of various key parameters are discussed with the help of graphs. It is noted that pressure rise increases with increase in couple stress parameter and decreases with increasing porous medium. The friction force has an opposite behavior compared with pressure rise.

A theoretical evaluation of total momentum distribution n(k), condensate momentum distribution n0(k) and non condensate momentum distribution nnc(k) as a function of k(π/a) using Bose-Hubbard model

Ashok Kumar, N. P. Singh andL. K. Mishra

  • Abstract

    Using the theoretical formalism of U. Ray and D. M. Ceperley (arXiv; 1209.1053v2 (2012)), we have studied condensate and non-condensate spatial and momentum distribution in Bose-Hubbard model. We have also theoretically estimated spatial and momentum distribution of condensate and non-condensate in far field (r→∞) and for finite TOF (Time of flight)(τ=20ms) as a function of k(π/a). Our theoretically evaluated results indicate that one can calculate exact n0 and used to characterize and study phase transition. Our theoretically evaluated results are in good agreement with other theoretical workers.

Interconnection of Heat and Mass Changes of the Reacting Substances at Physical and Chemical Transformations

Utelbayev B.T., Suleimenov E.N., Utelbayeva A. B .

  • Abstract

    The mass changes of reacting substances during the physical and chemical transformations are being described in this paper. The law of mass and energy conservation allow to conclude that an equivalent mass of matter in reacting system was distributed as a heat into the surroundings or conversely. Elementary act of the chemical reaction considering in terms of the dynamics of motion of matter particles allow to confirm about losing the mass of reacting system in an exothermic reaction. Based on the fundamental laws assumed existence of "some kind of an elementary particle calling as "carrier of heat energy”.

Estimation of water content of vegetable leaves using β attenuation technique

Komal Kirandeep, Parveen Bala, Amandeep Sharma

  • Abstract

    Water content in the plant leaves of Sponge gourd and Capsicum is determined based on their attenuating characteristics to beta particles. The transmitted intensities and mass attenuation coefficients, for beta particles of 204Tl and 60Co radioactive sources, through leaves of different thickness are measured. These parameters vary as the amount of water content in selected leaves gets changed. The transmission intensity decreases with increase of water amount in plant leaves. Beta attenuation is a fast, non-destructible method that provides continuous monitoring of plant water status. 

Empirical Formulae for Calculating Cross Sections and Neutron Yields for Producing Zinc and Copper

Saad N. Yaacoup

  • Abstract

    In the present work the elements 62Ni , 62Cu and 65Zn for 62Ni(p,n)62Cu and 62Ni(α,n)65Zn   eactions as well as proton energy from 7.8 MeV to 18 MeV with threshold energy (4.807325MeV) and alpha energy from 7.8 MeV to 35.3 MeV with threshold energy (6.900577MeV) are used according to the available data of reactions cross sections. The more recent cross sections data of 62Ni(p,n)62Cu and 62Ni(α,n)65Zn reactions are reproduced in fine steps with (0.2MeV) in the specified energy range , as well as cross section 62Cu(n,p)62Ni values were derived from 62Ni(p,n)62Cu as a function of energy in the same fine energy steps by using the reciprocity theory of principle inverse reaction . This calculation involves only the ground state of 62Ni and 62

Monitoring of Hazardous High Explosive Substitute Materials Dust Concentration during Processing

P. B. Wagh, Ratanesh Kumar, R. P. Patel, S. V. Ingale, Gaurav Pandey and Satish C. Gupta

  • Abstract

    In explosive processing facilities, High Explosives Substitute (HES) materials are used to train the operators and optimize the process parameters before using actual explosives. The process operations like casting and machining may generate material dust which could be toxic and may induce adverse health effects on the operators if exposed to unsafe dust concentration level. Therefore, it is important to measure the dust concentration during such operation. We have developed a simple method using portable air sampler for monitoring of such hazardous dust concentration during casting and machining of HES material for TNT. The dust generated by varying the process parameters has been monitored and recorded. The air sampling flow rate is kept at 1.5 L/min. The sample collection port was fixed at a height of a person for sampling of the respirable dust which has been measured on weight difference method

Discussions on the Numerical Solutions of Schön-Klasens Model: Trapping and Recombination Probability

Uzun Erdem

  • Abstract

    Theoretical and numerical viewpoints of the Schön-Klasens model were discussed. The brief information about mathematical principals of the model was given. Expressions that controlled charge carrier traffic were derived. Some numerical solutions of the model were performed by using variable Ate, Ath, Are and Arh parameters. This study has concluded that the glow curve is affected by both charge carriers according to relationship between (nc.m.Are) and (nv.n.Arh).

Design Electrostatic Mirror under Infinite Magnification Condition by Using Hyperbolic Function

Miss Intehaa Ahmed

  • Abstract

    This paper describes theoretical modeling of electrostatic mirror three electrodes. From suggested mathematical function has been used for representing the axial potential, along the optical axis of the electrostatic mirror. The main feature of this function is that it has more than one optimization parameters to let more flexiblility for the designer to test more parameters than the suggested in this function to reach the best axial potential which gives optimum properties. Studying the electron beam path under infinite magnification condition has been investigated as a mirror trajectory with aid of Rung-Kutta method. The electrode shape of mirror has been determined by using package SIMION computer program. From the knowledge of the first and second derivatives of axial potential distribution the optical properties are determined. The choice of mirror depends on the operational requirements, i.e. whether it is intended to operate the mirror in an elect

Peristaltic Flow Of A Fractional Second Grade Fluid through A Cylindrical Tube with Heat Transfer

V.P. Rathod and Anita Tuljappa

  • Abstract

    Peristaltic flow of a fractional second grade fluid through a cylindrical tube with heat transfer under the assumption of long wavelength and low Reynolds number approximations are used to linearise the governing equations. Analytical solution is obtained by using Caputo’s definition. The expressions for fractional parameter, material constant, heat transfer and amplitude ratio, temperature and friction force are discussed. The computational results are presented in graphical form.

A Theoretical Study Of Super Fluid – Insulator Phase Transition In A Gas Of Ultra Cold Atoms And Evaluation Of Atom Density Distribution As A Function Of Distance From The Centre Of Trap (R/A)

Ashok Kumar, N. P. Singh and L. K. Mishra

  • Abstract

    Using the theoretical formalism of Jakub Zakrzewski ( condmat/ 0406186v3 (2005), we have theoretically evaluated quantum phase transition from a super fluid to Mott insulator in a gas of ultra-cold atoms. Our theoretically evaluated results for mean field particle density distribution as a function of r/a are in good agreement with the results of quantum Monte Carlo simulation results. This calculation also indicates that mean field Gutzwiller approximation allows one to simulate the dynamics of Bose-Hubbard model taking into account of realistic experimental conditions. Our theoretically evaluated results are in good agreement with other theoretical workers.

Asteroseismic Studies of Stars in Binary Systems from Space and Ground Based Observations

J.Rukmini

  • Abstract

    Asteroseismology is the extension of Helioseismology, where millions of distinct, resonating sound waves originating in the interiors of the pulsating stars are detected by the Doppler shift in the light emitted by the surface of these stars. Studies of these resonant modes help in determining the temperature, chemical composition, and motions (core overshoot and rotation) from just below the surface down to the very core of these stars. Other parameters like distance, age, evolutionary process etc., are also established with these studies. When the pulsating star is a component of binary system, the reliability of basic stellar parameters derived (specially its mass and size) becomes very high. Binary systems like close binaries not only allow stringent tests of stellar evolution models, but also act as laboratories in which specific physical processes, which do not occur in single stars, take place. Understanding these processes is important because at

A theoretical study of strongly coupled plasma and an evaluation of electrical conductivity of strongly coupled tungsten plasma

Damoder Singh, Gajendra Prasad Gadker & L. K. Mishra

  • Abstract

    We have studied the physical behavior of strongly coupled plasma and theoretically analyzed the experimental data of electrical conductivity of strongly coupled tungsten plasma. We have studied the influence of equation of state (EOS) model in the interpretation of electrical conductivity of tungsten plasma. The theoretical study has been performed by the theoretical formalism of D. A. Baiko, Phys. Rev E80 (2009)8. Our theoretical results show that the results obtained from EOS3 is quite near to the experimental data.

LRS Bianchi Type V Perfect Fluid Cosmological Model in C – Field Theory with Variable Λ

Atul Tyagi and Gajendra Pal Singh

  • Abstract

    A cosmological model for perfect fluid distribution in creation field cosmology with varying cosmological constant (Λ) in Bianchi type - V space- time is investigated. To get deterministic model satisfying conservation equation, we assume Λ = 1/ R2 as considered by Chen and Wu1 where R is scale factor. We find that creation field (C) increase with time, Λ ~1/ t2, which matches with the result of HN theory. The decelaration parameter q < 0 which shows that universe is accelarating. The model is free from horizon.

The Pseudo Inverse of a Partitioned Matrix 

G.Ramesh and B.K.N. Muthugobal

  • Abstract

Hierarchically assembled zinc oxide nanorods: An application in Hg(II) adsorption

Kumar Swamy Yogesh Kumar, Handanahally Basavarajaiah Muralidhara, Chigari Chandrashekar Vidyasagar, Salekoppal Boregowda Benaka Prasad, Shivakumar Archana

  • Abstract

    Hierarchical zinc oxide nanorods (ZnO) were derived from hydrothermal method was investigated as suitable adsorbent for the removal of Hg(II) from aqueous solutions through batch adsorption process. Batch experiments were conducted under different adsorbate concentration, contact time, adsorbent dosage, pH and temperature conditions. Adsorption equilibrium data were best fitted with the Langmuir and Freundlich isotherm models and the maximum adsorption capacities of Hg(II) was determined to be 1449.2 mg/g. The adsorption kinetics of metal ion followed the pseudo-second-order model. Thermodynamic studies indicated that adsorption process is exothermic in nature. Regenerated ZnO shows one by third of the original adsorption capacity. The results indicate that the synthesized ZnO could be better replacement as a low cost adsorbent for the removal of Hg(II) from aqueous solution including industrial waste water.

An Inventory Model with Discrete Transportation Cost and Price Break

Vijay K Agarwal,Vandana Malviya, Arvind Maharshi, Jitendra Binwal

  • Abstract

    An algorithm presented in this paper is based on the theorem which provide the method of finding out optimum point when two types of function are considered simultaneously, one of these functions is piecewise continuous and the other is continuous. The algorithm takes care of a situation where discrete transportation cost interacts with the inventory cost, including price break, it deals exhaustively with various cases that arise under such situation. Illustrative examples are also included in this paper.

Slip Effect and Magnetic Field on the Peristaltic Flow of a Fractional Second Grade Fluid through a Cylindrical Tube

Rathod. V. P and Anita Tuljappa

  • Abstract

    In this paper, we study the slip effect and magnetic field on the peristaltic flow of a fractional second grade fluid through a cylindrical tube is analyzed. Analytical solution is carried out for long wavelength and low Reynolds number considerations. Closed form expressions have been obtained for axial velocity. The expression for pressure rise and frictional force are obtained. The effect or fractional parameter, material constant, time, amplitude, slip parameter, magnetic field on the axial pressure gradient and friction force are discussed and illustrated graphically through a set of graphs.

Thermal and Mechanical Properties of Composites from unsaturated polyester filled with Cured Resol Novolac resin

Widad.S.Hanoosh

  • Abstract

    The aim of this study was to investigate the thermal and mechanical properties of composites consist of unsaturated polyester(UP ) as matrix material and different weight ratio of cured resol novolac resin ( CRN ) as filler, the result obtained from this study showed that the thermal stability of the composites increased as CRN resin content increase which was a logical consequence of the high thermal stability of phenolic resin compound from filler compared to that of unsaturated poly ester resin,,,on the other hand the mechanical properties, i.e tensile and flexural strength of UP/ filler composites were improved in modulus with increasing filler content.

Comparative Studies of Commercially Available Thermal Insulation Materials and Sol – Gel Processed Thermal Insulation Materials

P. B. Wagh, S. V. Ingale, Ratanesh Kumar, R. P. Patel, Satish C. Gupta, A. A. Pisal, A. V. Rao

  • Abstract

    Thermal insulation materials have different applications in insulation and safety products. Their application could be limited due to water adsorption which may deteriorate performance. We have demonstrated a method in which the commercially available thermal insulation materials fabric was modified with silica gel which leads to improve thermal insulation properties along with imparting hydrophobicity to the materials. The unmodified insulation materials fabric was put in the silica sol prepared at optimized molar ratio of the precursor chemicals viz. Tetramethoxysilane: Methanol: H2O: :1:12:4, respectively. The materials fabric was then dried so as to get coated with silica gel. The modified insulation materials fabric was characterized by IR studies to confirm the coating of fabric by silica gel. The SEM characterization showed that the insulation materials get uniformly coated with silica gel adhered

Study Some Properties of Hybrids Silica /PVA using Sol- Gel Method

Harith Ibrahim and Seenaa Ibrahim

  • Abstract

    Aim of the research study of some physical properties of the hybrid films prepared with different percentages of TEOS/PVA (20%TEOS+80%PVA,50%TEOS +50%PVA, and 80%TEOS+20%PVA). The PVA80 (20%TEOS+80%PVA) It can be seen from these there is no variation in the transparency curve as they were in pure PVA. This means that silica has no effect on UV-Vis transparency wavelength when incorporated into the PVA. The Differential scanning calorimetric (DSC) was found that increases thermal stability of the hybrid films, an increase of ratio TEOS because of the thermal stability of silica. The last test moisture uptake, the moisture up take polyvinyl alcohol pure is more valuable than the hybrid film because the polymer hydrophilic.

Theoretical study of temperature effect on the wind power extracted as a renewable energy for electricity production in Nassiriyah district

Abdul-Kareem Mahdi Salih

  • Abstract

    The temperature effect on the wind power extracted as a renewable energy for electricity production in Nassiriyah district – south of Iraq- has been investigated for three years (2011-2013) by theoretical calculations. The study shows that the air temperature in this district affects extract power from the wind, this effect is dependent on the altitude and the value of temperature. The percentage of annual mean power loss decreases with the increasing of altitude. The annual mean power loss values vary between 6.1%Watt at 40 m altitude to 2.6% Watt at 300m altitude for the study time interval.

Analytical and Numerical Solution of Output Power of a Three-Level System in Optical Fiber Laser

Mudhir Sh. Ahmed and  seel S. Taha

  • Abstract

    In this paper, the rate equations of a three - level system fiber laser have been solved analytically with minimum approximation and the output versus input power has been derived. The results were applied to many designs of Er3+-doped fiber laser operating at 2.7μm and Tm3+-doped fiber laser operating at 2.3μm.