Indian Journal of Pure and Applied Physics

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Volume 46

Number 2

February 2008

CODEN: IJOPAU 46 (2) 75-148

ISSN: 0019-5596

 

 

 

CONTENTS

 

General

 

Radiation and mass transfer effects on an unsteady MHD convection flow past a semi-infinite
vertical permeable moving plate embedded in a porous medium with viscous dissipation

81

V Ramachandra Prasad* & N Bhaskar Reddy

 

Nuclear Physics

 

Self-affine multiplicity fluctuation of grey tracks in πˉ-AgBr interactions at 350 GeV/c

93

Dipak Ghosh*, Argha Deb, Sitaram Pal & Jayita Ghosh

 

Atomic and Molecular Physics

 

Fourier transform infrared and Fourier transform Raman spectra and normal coordinate
analysis of ethyleneimine

100

S Gunasekaran* & D Uthra

 

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

 

Fuel adulteration detection using long period fiber grating sensor technology

106

Vandana Mishra*, Subhash C Jain, Nahar Singh, G C Poddar & Pawan Kapur

 

Condensed Matter: Structural, Mechanical and Thermal Properties

 

Diffusion and transport phenomena in a collisional magnetoplasma with temperature anisotropy

111

K C Baral & G Nath*

 

Thermally stimulated discharge current and fractional polarization studies in polyimide
(Kapton-H) samples

118

M S Gaur*, Ramlal, Prashant Shukla, Pooja Saxena & R K Tiwari

 

 

 

Effect of L-arginine, L-histidine and glycine on the growth of KDP single crystals and their characterization

123

B Suresh Kumar & K Rajendra Babu*

 

Condensed Matter: Electronic Structure, Electrical, Magnetic and Optical Properties

 

Multiple relaxation investigations in polyetherimide: Thermally stimulated depolarization current technique

127

Randhir Singh, B K Kaushik & J K Quamara*

 

Design a tunable cavity resonator for complex permittivity measurement of low-loss material at L band

134

O P N Calla*, Sanjeev Kumar Mishra, Dinesh Bohra, Nitin Khandelwal, Paritosh Kalla, Charu Sharma, Neha Gathania, Naveen Bohra & Saurabh Shukla

 

Three site hole hopping in high TC superconductors

139

M Tiwari & R A Singh*

 

___________

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


Indian Journal of Pure & Applied Physics

Vol. 46, February 2008, pp. 81-92

 

Radiation and mass transfer effects on an unsteady MHD convection
flow past a semi-infinite vertical permeable moving plate embedded
in a porous medium with viscous dissipation

 

V Ramachandra Prasad*

Department of Mathematics, Madanapalle Institute of Technology and Science, Madanaplle 517 325

and

N Bhaskar Reddy

Department of Mathematics, Sri Venkateswara University, Tirupati 517 502

*E-Mail: rcpmaths@yahoo.com

Received 28 March 2007; revised 3 September 2007; accepted 2 November 2007

An unsteady, two-dimensional, hydromagnetic, laminar mixed convective boundary-layer flow of an incompressible, Newtonian, electrically-conducting and radiating fluid along a semi-infinite vertical permeable moving plate with heat and mass transfer is analyzed, by taking into account the effect of viscous dissipation. The plate moves with a constant velocity in the direction of fluid flow while the free stream velocity follows an exponentially increasing small perturbation law. The dimensionless governing equations for this investigation are solved analytically using two-term harmonic and non-harmonic functions. Numerical evaluation of the analytical results is performed and graphical results for velocity, temperature and concentration profiles within the boundary layer and tabulated results for the skin-friction coefficient, Nusselt number and Sherwood number are presented and discussed. It is observed that, when the radiation parameter increases, the velocity and temperature decrease in the boundary layer, whereas when thermal and solutal Grashof increase, the velocity increases.

Keywords: Radiation, Viscous dissipation, Heat and mass transfer

 

 

Indian Journal of Pure & Applied Physics

Vol. 46, February 2008, pp. 93-99

 

 

 

Self-affine multiplicity fluctuation of grey tracks in p--AgBr
interactions at 350 GeV/c

 

Dipak Ghosh, Argha Deb, Sitaram Pal* & Jayita Ghosh

Nuclear and Particle Physics Research Centre, Department of Physics, Jadavpur University, Kolkata 700 032

Kanchrapara College, North 24-pgs, 743145, West Bengal

Received 31 July 2006; revised 20 September 2007; accepted 17 December 2007

Fluctuation characteristics of protons produced in π--AgBr interactions at 350 GeV/c have been investigated in cosq, f and Xcosq-Xf phase spaces. Xcosq and Xf  Factorial moment methodology has been used for the analysis. In two-dimensional analysis, fluctuation characteristics have been studied both in self-similar and self-affine space. No scaling behaviour is observed in the full bin-range. For in-depth study, full bin range is divided into different sub-bins. Fluctuation analysis into different sub-bins confirms the scaling law in a particular bin only. The analysis provides an indication of self-affine fluctuation pattern in this bin. Xcosq and Xf 

Keywords: Proton fluctuation, Grey particle, Self-affine scaling, π--AgBr interactions

 

 

Indian Journal of Pure & Applied Physics

Vol. 46, February 2008, pp.100-105

 

 

Fourier transform infrared and Fourier transform Raman spectra and normal coordinate analysis of ethyleneimine

S Gunasekaran1 & D Uthra2

1Spectrophysics Research Laboratory, Pachaiyappa’s College, Chennai 600 030

2 Department of Physics, D G Vaishnav College, Chennai 600 106

E-mail : uthra_13@yahoo.com

Received 3 July 2007; revised 17 September 2007; accepted 18 December 2007

Ethyleneimine (C2H5N) also known as dimethyleneimine, azirane, aziridine is a toxic chemical that finds variety of uses in industries. It is volatile, highly reactive, corrosive and is considered as a potential carcinogen, but widely used in the paper, lacquer and photography industries. This molecule has eighteen fundamental modes of vibration under CS point group distributed as Γvib = 10A' + 8A''. In the present paper, normal coordinate analysis has been carried out for the molecule ethyleneimine with an orthonormal set of symmetry coordinates by using Wilson’s F-G matrix method. A satisfactory vibrational band assignment has been made in terms of normal modes of vibration using Fourier transform infrared and Fourier transform Raman spectroscopy. A reasonable set of potential constants was evaluated and found to be in good agreement with literature. The potential energy distribution has been evaluated which confirms the frequency assignment done, thus, providing a strong support to the present work.

Keywords:   Ethyleneimine, Fourier transform Infrared and Raman spectra, Normal coordinate analysis, Potential energy distribution

Indian Journal of Pure & Applied Physics

Vol. 46, February 2008, pp. 106-110

 

 

 

Fuel adulteration detection using long period fiber grating sensor technology

Vandana Mishra, Subhash C Jain, Nahar Singh, G C Poddar & Pawan Kapur

Central Scientific Instruments Organisation, Chandigarh 160 030

Fax No.: +91-172-2657267, 2657082

Received 13 June 2007; revised 11 December 2007; accepted 20 December 2007

Adulteration of petrol and diesel with kerosene is a common malpractice in India because kerosene has been made easily accessible at a price much cheaper than that of petrol and diesel. Such adulteration results in increased pollution, decrease in engine or machine performance, reduced lifetime of components, lower returns for money of the buyers and decrease in availability of kerosene to the needy people. There is no standard technique that is followed universally for detection of adulteration level. In this study, application potential of long period fiber grating (LPFG) sensor technology to detect fuel adulteration has been investigated. It was possible to detect presence of 10% contaminant in petrol and diesel using LPFG technique whereas the traditional technologies are able to detect presence of about more than 20% of the same.

Keywords: Sensor technology; Fiber grating, Fuel adulteration detection

 

Indian Journal of Pure & Applied Physics

Vol. 46, February 2008, pp.111-117

 

 

 

Diffusion and transport phenomena in a collisional magnetoplasma

with temperature anisotropy

 

*K C Baral & +G Nath

*Department of Physics, Salipur College, Salipur, Cuttack 754 202

+Department of Engineering .Physics, Dhaneswar Rath Institute of Engineering & Management Studies, Tangi, Cuttack 754 022

Received 19 June 2007; accepted 12 December 2007

The theory of collisional cross field diffusion and transport of a fully ionised singly charged plasma particles is analysed theoretically at the onset of an induced anisotropy  in plasma temperatures where  and represent the components of temperature along the magnetic field direction and the direction perpendicular to it, respectively. The modified diffusion transport coefficients like the electrical resisitivity () and thermal conductivity (K) are found to decrease significantly with increase in the thermal ratio  while both the  drift velocity and the thermoelectric coefficient (l) remain independent of the thermal anisotropy. However, in the limiting approximation (=), the results agree with the early isotropic works of Rosenbluth and Kaufmann, Phys Rev, 1 (1958) 109, Goldstone and Rutherford [IOP Publishing 1995, Braginskil (1965)].

Keywords: Diffusion, Transport phenomena, Magnetoplasma, Anisotropy

 

Indian Journal of Pure & Applied Physics

Vol. 46, February 2008, pp. 118-122

 

 

Thermally stimulated discharge current and fractional polarization studies in polyimide (Kapton-H) samples

M S Gaur*, Ramlal, Prashant Shukla, Pooja Saxena & R K Tiwari

Department of Physics, Hindustan College of Science and Technology, Farah (Mathura) U P

*E- mail: mulayamgaur@rediffmail.com

Received 31 January 2007; revised 24 October 2007; accepted 12 December 2007

In order to understand the relaxation processes responsible for thermally charged polyimide (PI) samples, the thermally stimulated discharge currents (TSDC) and fractional polarization thermally stimulated discharge current (FPTSDC) have been recorded. FPTSDC study is found to be having dipolar as well as space charge relaxation. The appearance of the second peak (i.e. b peak) at different poling field indicated that this peak is attributed to dipolar relaxation in polyimide. The peak position and activation energy do not change with the poling field (Vp), but it is very sensitive to the poling temperature (Tp). The magnitude of peak current has been found to vary with poling field and temperature. The poling field seems to change the reorientation of dipoles associated with b peak. The γ (first peak) and b (second peak) peaks were attributed to the motion of the side chain and the dipole-orientation associated with the residual reactive groups, respectively. The α peak (third peak) may be due to the space charge polarization or due to charge injected from the electrode. The activation energy and charge released have been found to vary with the poling field, poling temperature and poling time for this peak. FPTSDC spectra are showing two peaks which correspond to dipolar and space charge relaxation , respectively and are in good agreement with TSDC.

Keywords: TSDC, FPTSDC, Dipolar relaxation, Space charge relaxation, Activation energy

 

Indian Journal of Pure & Applied Physics

Vol. 46, February 2008, pp. 123-126

 

 

Effect of L-arginine, L-histidine and glycine on the growth of KDP single crystals and their characterization

B Suresh Kumar & K Rajendra Babu

Department of Physics, Mahathma Gandhi College, Thiruvananthapuram 695 004

Received 29 September 2006 ; revised 31 July 2007, accepted 5 December 2007

Optically good quality single crystals of pure and amino acid doped KDP have been grown by slow evaporation method at constant temperature (40°C). The effect of amino acid dopants on the growth and characterization of KDP crystals has been studied. The grown crystals are characterized by density, melting point determination and X-ray powder diffraction. The presence of functional groups of crystals are qualitatively analysed from FTIR spectra. Thermal properties like decomposition temperatures and weight loss have been reported from the TGA and DTA analysis. The transparency of the grown crystals has been confirmed using UV-Vis spectra. It has been found that SHG efficiency of KDP, containing amino acids is higher than pure KDP crystals. Dielectric behaviour of pure and doped samples has been studied at a temperature range 30 - 180ºC and a constant frequency 1 kHz.

Keywords: Potassium dihydrogen phosphate crystals (KDP), L-arginine, L-histidine, Glycine, Non linear optical crystals (KLO)

 

Indian Journal of Pure & Applied Physics

Vol. 46, February 2008, pp. 127-133

 

Multiple relaxation investigations in polyetherimide: Thermally stimulated depolarization current technique

 

Randhir Singh*, B K Kaushik & J K Quamara**

Department of Applied Physics, National Institute of Technology, Kurukshetra 136 119

Received 5 February 2007; revised 31 July 2007; accepted 14 December 2007

Thermally stimulated depolarization current (TSDC) technique has been used for investigating various dielectric relaxation processes in polyetherimide. The TSD currents in the temperature range 20°-250°C (in certain cases up to 300°C) were obtained as functions of polarizing field (Ep; 20-350 kV/cm), polarizing temperature (Tp; 60 °-180°C), poling time (tp; 0.5-2 h), sample thickness (d; 25-120 µm), heating rate (h; 2°-6°C/min), and storage time (ts; 0-552 h). The current maxima in the TSDC spectra reveal the presence of two major relaxation processes termed as β- (around 130°C) and a- (around 190°C), associated with dipolar relaxation and space-charge relaxation processes, respectively. However, in certain cases, we observe merging of β- and a-relaxation processes to become the αβ-relaxation process (140°-180°C). The observed dependence of the peak temperature Tm on polarizing temperature and poling time indicates a continuous distribution of relaxations. The high Ep/Tp samples also show a relaxation (ρ) around 260°C associated with charge injection phenomenon. The low temperature region of TSDC spectra (30°-70°C) shows the presence of a weak relaxation (β¢), considered as a satellite of the main dipolar relaxation process. The activation energies for various relaxation processes have been calculated using Bucci plot method.

Keywords: Multiple relaxation , Polyetherimide, Thermally stimulated depolarization current , Depolarization, Dipolar relaxation, Activation energies

 

Indian Journal of Pure & Applied Physics

Vol. 46, February 2008, pp. 134-138

Design a tunable cavity resonator for complex permittivity measurement
of low-loss material at L band

O P N Calla, Sanjeev Kumar Mishra & Dinesh Bohra

International Centre for Radio Science, Jodhpur

and

Nitin Khandelwal & Paritosh Kalla

Kautilya Institute of Technology, Jaipur

and

Charu Sharma & Neha Gathania

Rajasthan College of Engineering for Women, Jaipur

and

Naveen Bohra

Sri Balaji College of Engineering & Technology, Jaipur

and

Saurabh Shukla

National Institute of Technology, Hamirpur

Received 16 October 2006; revised 20  September 2007; accepted 16 October 2007

The value of loss tangent (tanδ) of the low loss material is of the order of 10-4. There are different methods used to measure loss tangent as well as complex permittivity. Out of different methods, Cavity Resonator method is the best method for the measurement of complex permittivity of low loss materials i.e. teflon, duroid, polystyrene and stycast. In this present paper, a cylindrical cavity resonator is designed and fabricated in the frequency range  2.2-2.3 GHz and the complex permittivity of low loss material teflon using cavity resonator method has been measured.

Keywords: Cavity resonator, Complex permittivity, Dominant mode, Low-loss materials

 

Indian Journal of Pure & Applied Physics

Vol. 46, February 2008, pp. 139-144

 

 

Three site hole hopping in high TC superconductors

 

M Tiwari & R A Singh*

Department of Physics, Dr H S Gour University,Sagar 470 003

Received 17 July 2006; revised 9 October 2007; accepted 18 December 2007

Dynamics of holes containing three site hole hopping and parallel hopping has been studied. A new type of hole-hole correlation is discussed. The effect of three site term and parallel hopping term on hole-hole correlation has been investigated.

Keywords: High TC superconductors, Supercondctors, Three site hole hopping