Indian Journal of Pure and Applied Physics

      Total visitors: 935  since 21-08-06

 ISSN: 0019-5596

CODEN: IJOPAU 44 (6) 563-632

VOLUME  44

NUMBER 8

AUGUST 2006

 

CONTENTS

The Physics of Elementary Particles and Fields

 

Stability analysis of dyon solutions  in gauge theory

567

Vinod Singh, B V Tripathi & D C Joshi*

 

Electromagnetism, Optics, Acoustics, Heat Transfer, Classical Mechanics and Fluid Dynamics

 

Real time measurement of aerosol size distribution using MASTERSIZER

576

R Baskaran*, V Subramanian & T S Selvakumaran

 

Atomic and Molecular Physics

 

Vibrational spectra and normal coordinate analysis of flucytosine

581

S Gunasekaran*, S Seshadri & S Muthu

 

Electromagnetism, Optics, Acoustics, Heat Transfer, Classical Mechanics and Fluid Dynamics

 

Acoustic studies of binary mixtures of N-methylacetamide with some chloroethanes and chloroethenes at 308.15 K

587

B Sathyanarayana, T Savitha Jyostna & N Satyanarayana*

 

Condensed Matter: Structure, Mechanical and Thermal Properties

592

Irreversible modified complex Brayton cycle under maximum economic condition

 

Sudhir K Tyagi, Shengwei Wang & S C Kaushik*

 

Synthesis, crystal structure and study of X-H…A interactions in N,N’-bis-(4-methoxy-benzylidine)-hydrazine

602

Rajnikant*, Dinesh, M B Deshmukh & Kamni

 

Mechanism of phase formation of BaTiO3-SrTiO3 solid solution through solid – oxide reaction

606

S K Rout & S Panigrahi*

 

Thermodynamic properties of repulsive hard-core Yukawa fluid

612

Rajat Srivastava, Dhermendra Kumar Dwivedee & K N Khanna*

 

Surface phenomenon of chemisorption and its effect on density of states with reference to correlation on the metal surface

616

S Patra

 

Microwave absorption and relaxation studies of binary mixtures of fluoro substituted anilines with some primary alcohols in benzene solutions

620

A N Prajapati, V A Rana & A D Vyas*

 

Interdisciplinary Physics and Related Areas of Science and Technology

 

Novel single resistance controlled sinusoidal oscillator using FTFN and OTA

625

V Kumar, K Pal & G K Gupta*

 

___________

*The corresponding author has been indicated by (*) mark in case of papers with more than one author.

 


 

Indian Journal of Pure & Applied Physics

Vol. 44, August 2006, pp. 567-575

 

Stability analysis of dyon solutions SU(3) Ä SU(3) in gauge theory

Vinod Singh, B V Tripathi & D C Joshi

Department of Physics, H N B Garhwal University, Srinagar (Garhwal), Uttaranchal 246 174

Received 2 May 2005;revised 25 July 2006; accepted 28 April 2006

The stability of the dyon solutions obtained by using a Cabibbo Ferrari type non-abelian field tensor has been analyzed and it has been found that they obey the criterion of stability of having a finite energy with a saturated lower bound with conserved electric and magnetic charges.

Keywords: Gauge theory, Dyon solutions, Non-abelian field tensor

Indian Journal of Pure & Applied Physics

Vol. 44, August 2006, pp. 576-580

Real time measurement of aerosol size distribution using MASTERSIZER

R Baskaran*, V Subramanian & T S Selvakumaran

Radiological Safety Division, Safety Group, Indira Gandhi Center for Atomic Research, Kalpakkam 603 102

Received 14 February 2005; revised 20 March 2006; accepted 2 May 2006

An Aerosol Test Facility (ATF) has been set-up at Radiological Safety Division (RSD), Indira Gandhi Center for Atomic Research (IGCAR), Kalpakkam, for the aerosol studies on fast reactor safety. In order to measure the Mass Median Diameter (MMD) of the aerosols in real time, a laser based instrument MASTERSIZER (M/s MALVERN, UK) is used. Mastersizer is provided with a liquid flow cell and a powder spray unit which are useful for the off-line measurement. For the real time measurement, an aerosol flow cell is designed and fabricated. It is integrated with the MASTERSIZER and the aerosol chamber of ATF. Aerosols are drawn through the aerosol flow cell whose optical windows are aligned with the laser path of MASTERSIZER. In this paper, the details and the performance test results of the aerosol flow cell are presented. Performance test of the aerosol flow cell is carried out with polystyrene latex particles of diameter 2.799 µm and methylene blue aerosols. Sodium oxide aerosols are generated and injected into the aerosol chamber, and the time evolution of MMD of sodium oxide aerosols has been studied.

Keywords: Mastersizer, Aerosol size, Aerosol test facility, Fast reactor safety

IPC Code: B01J19/00

Indian Journal of Pure & Applied Physics

Vol. 44, August 2006, pp. 581-586

Vibrational spectra and normal coordinate analysis of flucytosine

S Gunasekaran*, S Seshadri1 & S Muthu 2

*PG & Research Department of Physics, Pachaiyappa’s College, Chennai 600 030

1Department of Physics, Sri Chandrasekharendra Saraswathi Viswa Maha Vidyalaya, Enathur, Kanchipuram 631 561

2Department of Applied Physics, Sri Venkateswara College of Engineering, Sriperumbudur 602 105

E-mail: sri_sesha@yahoo.com

Received 27 January 2006; accepted 7 June 2006

A normal coordinate analysis on flucytosine has been carried out with a systematic set of symmetry coordinates following Wilson’s F-G matrix method. The potential constants evaluated for the molecule are found to be in good agreement with literature values thereby confirming the vibrational assignments. To check whether the chosen set of vibrational frequencies contributes maximum to the potential energy associated with the normal coordinates of the molecule, the potential energy distribution has been evaluated.

Keywords : Normal coordinate analysis, FTIR and FT Raman spectrum, Flucytosine

IPC Code : GO1J 3/44

Indian Journal of Pure & Applied Physics

Vol. 44, August 2006, pp. 587-591

Acoustic studies of binary mixtures of N-methylacetamide with some chloroethanes and chloroethenes at 308.15 K

B Sathyanarayana, T Savitha Jyostna & N Satyanarayana *

Department of Chemistry, Kakatiya University, Warangal 506 009

Received 9 January 2006; revised 24 April 2006; accepted 12 June 2006

The densities and speeds of sound of mixtures of 1,2 dichloroethane, 1,1,2 trichloroethane, 1,1,2,2 tetrachloroethane, trichloroethene and tetrachloroethene with N-methylacetamide, over the entire range of composition, have been measured at a temperature of 308.15 K. The deviations in speed Δu, isentropic compressibility ΔkS, intermolecular free-length ΔLF and relative association RA have been computed using speed and density values. The Δu values are negative whereas ΔkS and ΔLF values are positive for all the systems, which indicate the non-specific interactions between unlike molecules. The results are discussed in the light of intermolecular interactions occurring in the solutions. The computed results of ΔkS, have been fitted to a Redlich-Kister type polynomial equation.

Keywords: Ultrasonics, Binary mixtures, Chloroethanes, Chloroethenes, N-methylacetamide

IPC Code: B01J19/10

Indian Journal of Pure & Applied Physics

Vol. 44, August 2006, pp. 592-601

Irreversible modified complex Brayton cycle under maximum economic condition

 

Sudhir K Tyagi, Shengwei Wang & S C Kaushik*

Department of Building Services Engineering, The Hong Kong Polytechnic University, Hung Hom, Kowloon, Hong Kong

*Centre for Energy Studies, Indian Institute of Technology, Delhi, New Delhi 110 016

Received 27 January 2006; accepted 2 May 2006

An irreversible complex Brayton cycle under maximum economic conditions has been investigated. The economic function has been optimized with respect to the cycle temperatures, reheat and intercooling pressure ratios for a typical set of operating conditions. It is found that there are optimal values of the intercooling, reheat and cycle pressure ratios at which the cycle attains the maximum objective function, maximum power and maximum efficiency. The maximum economic point, maximum power point and the maximum efficiency point exist but the economic function corresponding to the maximum power and maximum efficiency is found to be lower than that can be attained and vice-versa. The optimal values of different parameters corresponding to the maximum economic function are different from those corresponding to the maximum efficiency and maximum power for the same set of operating conditions. Again, all the performance parameters further enhance as the heat capacitance rates of the external reservoirs and increased, while it is found to be reverse in the case of the working fluid heat capacitance rate and the inlet temperature of the conversing combustion chamber (CCC). The objective function and efficiency are found to be the decreasing functions of the reheat pressure ratio for lower values of CCC inlet temperature while there are optimal values of the reheat pressure ratio for higher values of the inlet temperature of the CCC.

Keywords: Complex Brayton cycle, Economic objective function, Efficiency regenerator, Turbine, Compressor

IPC Code: F01, F23L

 

 

 

Indian Journal of Pure & Applied Physics

Vol. 44, August 2006, pp. 602-605

Synthesis, crystal structure and study of X-H…A interactions in N,N′-bis-(4-methoxy-benzylidine)-hydrazine

Rajnikant, Dinesh, M. B. Deshmukh* & Kamni

Condensed Matter Physics Group, Postgraduate Department of Physics, University of Jammu, Jammu Tawi 180 006

*Department of Chemistry, Shivaji University, Kolhapur 416 004

Received 30 November 2005; accepted 20 April 2006

Synthesis and crystal structure of N,N′-bis-(4-methoxy-benzylidine)-hydrazine have been reported in this paper. The title compound crystallizes in the monoclinic space group C2/c with unit cell parameters a = 17.416(3), b = 10.711(3) and c =8.428(3)Å, b =113.64(2)o, V = 1440.2(8)Å3 and Z = 4. The structure has been refined to a R-value of 0.038 for 937 observed reflections. The molecules adopt columnar packing in the unit cell and the crystal structure is stabilized by two intra- and five intermolecular hydrogen bonded interactions.

Keywords : Crystal structure, Hydrazines, Intra- and Intermolecular Interactions, Alkaloid

IPC Code: B28D5/00

 

Indian Journal of Pure & Applied Physics

Vol. 44, August 2006, pp. 606-611

Mechanism of phase formation of BaTiO3-SrTiO3 solid solution through solid – oxide reaction

S K Rout* & S Panigrahi

 Department of Physics, National Institute of Technology, Rourkela 769 008

Received 22 November 2005; revised 31 March 2006; accepted 12 June 2006

The formation of solid solution composition Ba0.5Sr0.5TiO3, from BaCO3, SrCO3 and TiO2 powders has been studied through solid oxide reactions using TGA/DSC and XRD. The compound BaCO3 decomposes at much lower temperature in the mixture due to the presence of acidic TiO2. BaTiO3 (BT) and SrTiO3 (ST) which start forming from the temperatures 700 and 800°C, respectively without formation of BaO/SrO or any titanate phases. Rietveld refinement shows the rate of formation of BT is relatively higher than that of ST. The solid solution Ba0.5Sr0.5TiO3 (BST (ss)) starts forming from 1000°C. The rate of formation of BaTiO3 is higher than that of SrTiO. Activation energy for formation of BaTiO3 (40.41 kcal/mol) is higher than that of SrTiO3 (58.867 kcal/mol) in the system. Lattice parameter of initial solid solution phase is higher indicating that the BST forms with the interface of BT. The final BST (ss) formation requires more activation energy (76.999 kcal/mol) than initial BT and ST.

Keywords: Perovskite, Phase formation kinetics, BaTiO3-SrTiO3, Solid solution

IPC Code: B01D9/00

Indian Journal of Pure & Applied Physics

Vol. 44, August 2006, pp. 612-615

 

Thermodynamic properties of repulsive hard-core Yukawa fluid

Rajat Srivastava, Dhermendra Kumar Dwivedee & K N Khanna

Department of Physics, V S S D College, Kanpur

Received 22 December 2005; revised 19 April 2006; accepted 28 April 2006

A simple analytical expression of the mean spherical solution (Mean spherical approximation – high temperature expansion) to the Ornstien-Zernike equation for repulsive hard core Yukawa fluid is examined. The thermodynamic and structural properties of purely repulsive hard-core Yukawa particles in the fluid state are determined by employing this model and compared with simulation data. The results show that the present model illustrates the remarkable improvement of internal energy per particle over existing theoretical values.

Keywords: Thermodynamic properties, Yukawa fluid, Mean spherical approximation

Indian Journal of Pure & Applied Physics

Vol. 44, August 2006, pp. 616-619

 

Surface phenomenon of chemisorption and its effect on density of states with reference to correlation on the metal surface

S Patra

Department of Physics, G B Pant University of  Agriculture &  Technology, Pantnagar  263145

Received 26 August 2005; revised 27 January 2006; accepted 22 May 2006

A change in density of states is obtained by inclusion of intra-atomic interaction term to the mixing Hamiltonian constructed due to chemisorbed adatoms  with the clean  metal surface. The double-time Green function technique was employed in the Zubarev’s  equation of motion formalism and in order to decouple the hierarchy of higher order Green functions Hartee-Fock decoupling  approximation was assumed. From the corresponding surface Green function, the modified density of states was obtained through which chemisorption energy and energy of localization were estimated and it was  found that they were of the same order as per the prediction.

Keywords: Chemisorption, Density of states, Green function

IPC Code: C22C

 

Indian Journal of Pure & Applied Physcis

Vol. 44, August 2006, pp. 620-624

 

 

Microwave absorption and relaxation studies of binary mixtures of fluoro substituted anilines with some primary alcohols in benzene solutions

A N Prajapati, V A Rana­ & A D Vyas*

*Physics Department, School of Sciences, Gujarat University, Ahmedabad

E-mail: ranava2001@yahoo.com

Received 10 February 2006; accepted 9 May 2006

Complex permittivity at 9.1 GHz, static permittivity at 455 kHz and refractive index at optical frequency of methanol, ethanol, 1-propanol, 2-fluoroaniline, 4-fluoroaniline and their binary mixtures have been measured at a single temperature
(30
°C) in dilute solution of non-polar solvent benzene. The measured values of permittivity and dielectric loss have been used to evaluate distribution parameter (α) and relaxation times t0, t(1), t(2) and dipole moment (m). The variation of relaxation time versus concentration suggests solute-solute/solute-solvent type of association through hydrogen bonding.

Keywords: Dielectric relaxation, Binary mixture, Dipole moment, Relaxation time

IPC Code: G01R27/26

 

Indian Journal of Pure & Applied Physics

Vol. 44, August 2006, pp. 625-627

 

Novel single resistance controlled sinusoidal oscillator using FTFN and OTA

V Kumar, K Pal* & G K Gupta

Department of Physics, D B S College, Dehradun, Uttranchal

*Department of Earthquake Engineering, Indian Institute of Technology Roorkee, Roorkee

E-mail: varunkumar79@gmail.com, *kiratfeq@iitr.ernet.in

Received 5 August 2005; revised 10 April 2006; accepted 24 April 2006

A novel single resistance controlled sinusoidal oscillator using one p Four terminal floating nullor (pFTFN) and one Operational transconductance amplifier (OTA) to alongside two resistors and two capacitors, all ground, is presented. It is suitable for IC implementation due to use of grounded capacitors. Simulations results are given to verify the theoretical analysis. The oscillation frequency is adjustable through grounded resistor R1 which can be made voltage variable.

Keywords: Sinusoidal oscillator, FTFN, Signal processing, Control system

IPC Code: H03B