Indian Journal of Pure and Applied Physics

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Published by: NISCAIR, CSIR, New Delhi

Subjects: Physics

Started in 1963, this journal publishes Original Research Contribution as full papers, notes and reviews on classical and quantum physics, relativity and gravitation; statistical physics and thermodynamics; specific instrumentation and techniques of general use in physics, elementary particles and fields, nuclear physics, atomic and molecular physics, fundamental area of phenomenology, optics, acoustics and fluid dynamics, plasmas and electric discharges, condensed matter-structural, mechanical and thermal properties, electronic, structure, electrical, magnetic and optical properties, cross-disciplinary physics and related areas of science and technology, geophysics, astrophysics and astronomy. It also includes latest findings in the subject under News Scan.

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2010     .511
   
   


ISSN No. :    0019-5596
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CCCIIs-based sinusoidal quadrature oscillators with non-interactive control of condition and frequency
Title: CCCIIs-based sinusoidal quadrature oscillators with non-interactive control of condition and frequency

Authors: Summart, Saksit; Thongsopa, Chanchai; Jaikla, Winai

Abstract: The paper presents two current-mode quadrature oscillators with non-interactive two current controls for both of the condition of oscillation (CO) and the frequency of oscillation (FO) using current controlled current conveyors (CCCIIs). The proposed oscillators can provide two sinusoidal output currents with 90 degrees phase difference. It also provides high output impedances that make the circuit can directly drive load without additional current buffer. The condition of oscillation and frequency of oscillation can be controlled by adjusting the bias currents of the CCCIIs. The proposed circuits use only grounded capacitors without any external resistor which is very appropriate for further development into an integrated circuit. The results of PSPICE simulation program are corresponding to the theoretical analysis.

Page(s): 277-283

Screening mechanism and multi-vortices in dual QCD vacuum
Title: Screening mechanism and multi-vortices in dual QCD vacuum

Authors: Nandan, H; Bezares-Roder, N M; Chandola, H C

Abstract: The screening effects in a chromodynamic vacuum which act as dual superconductor in the background of the magnetic condensation, have been studied. The colour charge and colour electric flux screening mechanism have been investigated and these screening effects are shown to be responsible for the colour confinement in dual QCD. It is also demonstrated that with the transition from the type-II to type-I in dual QCD vacuum at strong coupling constant as 0.5, there exist n-vortex solutions with Bogomol’nyi-Prasad-Sommerfeld (BPS) conditions.

Page(s): 271-276

Electronic microscopic, thermal and electrical properties of Bi2V1-xTixO5.5 (0.05≤x≤0.20) oxide ion conductors
Title: Electronic microscopic, thermal and electrical properties of Bi2V1-xTixO5.5 (0.05≤x≤0.20) oxide ion conductors

Authors: Kaur, Gurbinder; Pandey, O P; Singh, K

Abstract: In the present study, the effect of titanium substitution for vanadium on oxide ion conductivity, phase stability and thermal expansion has been investigated. The exact solid solubility limit of the dopant and its effect on conductivity as well as thermal expansion, have been studied. The samples have been prepared by conventional solid-state technique. The sintered samples were characterized using differential thermal analysis (DTA), thermo-gravimetric analysis (TGA), X-ray diffraction (XRD) and scanning electron microscopy (SEM). Sample x = 0.20 has shown maximum conductivity of 1.210-3 S/cm with minimum activation energy of 0.19 eV at 800°C. Along with this, maximum thermal expansion coefficient (TEC) is observed for x = 0.2 sample. The microstructures of the samples exhibited variation in grain size and porosity.

Page(s): 262-270

Effect of doping cations Li(I)-, Ca(II)-, Ce(IV)- and V(V)- on the properties and crystalline perfection of potassium dihydrogen phosphate crystals: A comparative study
Title: Effect of doping cations Li(I)-, Ca(II)-, Ce(IV)- and V(V)- on the properties and crystalline perfection of potassium dihydrogen phosphate crystals: A comparative study

Authors: Ramasamy, G; Bhagavannarayanana, G; Meenakshisundaram, Subbiah

Abstract: The effect of doping metal ions with varied ionic charges (ranging from +1 to +5), Li(I)-, Ca(II)-, Ce(IV)- and V(V)- on the growth process and properties of potassium dihydrogen phosphate (KDP) crystals, grown by slow evaporation solution growth technique, has been investigated. Incorporation of metal ion into the KDP crystalline matrix is well confirmed by energy dispersive X-ray spectroscopy and atomic absorption spectroscopy. Interesting to observe that the incorporation is comparatively less in doping the higher valent metal. The powder XRD pattern and Fourier transform-IR analysis confirm the slight distortion in the structure of the KDP crystals as a result of metal ion doping. Slight changes in cell parameter values of doped KDP crystals are observed by single crystal XRD analysis. The high-resolution X-ray diffraction (HRXRD) studies used to evaluate the crystalline perfection reveal many interesting features on the ability of accommodating the dopants by the crystalline matrix. Surface morphological changes because of foreign metal ion incorporation are observed by scanning electron microscopy. UV-Vis spectroscopy reveals that the transparency is not affected much by the dopants and the cut-off wavelengths of all the doped specimens lie in a close range. Band-gap energies are estimated using optical transmittance data. Enhanced second harmonic generation efficiency is observed.

Page(s): 255-261

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