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Browsing Journals by Issue Date

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  • Magnetic electron drift vortex in magnetized plasma 
    Khizar, M; Mirza, Arshad M; Salahuddin, M; Qaisar, M S (1997-01-01)
    The Magnetic Electron Drift Vortex (MEDV) modes in a homogeneous magnetized plasma are investigated using the Braginskii's fluid model for electrons. It is found that the modes become unstable when the propagation is in ...
  • Two-photon laser-optogalvanic spectroscopy of the odd-parity Rydberg series of krypton 
    Ahmed, M; Zia, M A; Baig, M A; Suleman, B (Journal of Physics B: Atomic, Molecular and Optical Physics, 1997-01-01)
    We report new data on the odd-parity bound and autoionized Rydberg series of krypton using single-colour two-photon laser-optogalvanic spectroscopy. These series were excited from the and metastable levels. A total of 10 ...
  • Physica Scripta Correlation Study of Ion, Electron and X-ray Emission from Argon Focus Plasma 
    Zakaullah, M; Ahmad, Imtiaz; M Shafique, M; Murtaza, G; Yasin, M; Beg, M M (Physica Scripta, 1998-01-01)
    In a low energy argon plasma focus energized by a 32µF, 15kV single capacitor, ion, electron and X-ray emission are studied. At a low pressure of 0.25mbar, the X-ray emission region in broad and a considerable amount of ...
  • Energy Loss of a Test Charge in Dusty Plasmas: Collective and Individual Particle Contributions 
    Nasim, M H; Mirza, Arshad M; Murtaza, G; Shukla, P K (Institute of Physics, 1999-01-01)
    The energy loss of a test charge in dusty plasma with dust charge fluctuations has been calculated both analytically (within the frame work of dielectric theory) as well as numerically. The dust charge relaxation rate is ...
  • Two-step laser spectroscopy of the even-parity Rydberg levels of neutral tin 
    Nadeem, Ali; Ahad, A; Bhatti, S A; Ahmad, Nisar; Ali, Raheel; Baig, M A (Journal of Physics B: Atomic, Molecular and Optical Physics, 1999-01-01)
    We report the first measurements of the even-parity J = 1 and 2 levels of neutral tin using a two-step laser excitation technique in conjunction with an atomic beam apparatus. The Rydberg series 5pnp (1/2,3/2)2 (11leq ...
  • Gamma Dosimetry with CR-39 Etch Track Detector 
    Matiullah; Dogar, Ashiq Hussain; Ahmad, Nasir; Amin, Masood (The Japan Society of Applied Physics, 1999-01-01)
    To preserve and improve the safety of food for commercial purposes, it is exposed to high gamma-ray doses. The gamma-ray doses used for this purpose range from 0.15 kGy to 50 kGy. At such high doses, the etching characteristics ...
  • Effects of iron doping on the transport and magnetic behaviour in La0.65Ca0.35Mn1-yFeyO3 
    Hasanain, S K; Nadeem, M; Shah, Wiqar Hussain; Akhtar, M J; Hasan, M M (Institute of Physics (IOP), 2000-01-01)
    We report on the magnetic and transport measurements in an Fe-doped colossal magnetoresistance compound (La0.65Ca0.35MnO3). Increased spin disorder and a decrease of Tc with increasing Fe content are evident. We find that ...
  • Efficiency of plasma focus for argon K-series line radiation emission 
    Zakaullah, M; Alamgir, Khalid; Murtaza, G; Waheed, A (Institute of Physics, 2000-01-01)
    X-radiation emission from a low-energy Mather-type plasma focus operated with argon is investigated. Attention is paid to finding the pressure range for the highest argon K-series line emission. The argon line radiation ...
  • Journal of Optics B: Quantum and Semiclassical Optics The influence of atomic decay on the linewidth of a two-photon micromaser 
    Hamza, M Y; Qamar, Shahid (Quantum Semiclass. Opt., 2000-01-01)
    In this paper, we study the influence of atomic decay on the linewidth of a two-photon micromaser using an exact Hamiltonian approach. We consider a three-level cascade atomic system (where each level has a finite lifetime) ...
  • The dimer-trimer and monomer-trimer models for heterogeneous catalysis: a phase diagram study 
    Unknown author (The dimer-trimer and monomer-trimer models for heterogeneous catalysis: a phase diagram study, 2000-01-01)
    The phase diagram of the dimer-trimer model has already been studied for Kagome and hexagonal lattices, the detail of which can be found in the literature. Here, we have studied the same model on a square lattice to look ...
  • Study of Plasma Parameters in a Spinning Thick-Gas-Puff Staged Pinch 
    Khattak, N A D; Ahmad, Zahoor; Mirza, Arshad M; Murtaza, G (Chinese Physical Society and IOP Publishing Ltd, 2000-01-01)
    The dynamics of a finite-thickness imploding spinning gas-puff is studied for a staged pinch device. Our numerical results demonstrate that although large spin velocities help to suppress R–T instability, but they adversely ...
  • Journal of Physics D: Applied Physics Thermophysical properties of consolidated porous rocks 
    Shabbir, G; Maqsood, A; Majid, C A (2000-01-01)
    Thermal conductivity, thermal diffusivity and heat capacity per unit volume of consolidated porous rocks have been studied as a function of temperature with air as a saturant, at atmospheric pressure. The transient plane ...
  • Wake-field excitations in a multi-component dusty plasma 
    Nasim, M H; Mirza, Arshad M; Murtaza, G (Institute of Physics, 2001-01-01)
    The wake-field excited by a test charge moving through a multicomponent dusty plasma is calculated by using the fluid as well as the Vlasov–Poisson model. It is shown that the ion-wake field may be oscillatory (Vt < CDA), ...
  • Improvement in the Sample Mass-Change-Method used for Determination of the Bulk Etch Rate of CR-39 Neutron Detector 
    Tahiri, Iftikhar Ahmad; Matiullah; Subhani, M. S.; Kudo, Katsuhisa (Institute of Physics, 2001-01-01)
    The bulk etch rate is an important parameter of any etch-track detector. An accurate measurement of the bulk etch rate is, therefore, highly desirable in the calibration of a CR-39-based neutron dosimeter. Amongst several ...
  • Improved temperature measurement in a plasma focus by means of a cobalt filter 
    Zakaullah, M; Alamgir, Khalid; Shafiq, M; Hassan, S M; Murtaza, G; Waheed, A (Institute of Physics, 2001-01-01)
    The characteristics of cobalt as a soft x-ray filter are investigated. It is found to be a good choice to diagnose 0.5-5 keV hot plasmas in a device like a plasma focus. The focus plasma temperature is found to be filling ...
  • Anisotropic Energy Loss of a Pair of Charged Projectiles in a Dusty Plasma 
    Murtaza, G; Nasim, M H (Institue of physics, 2001-01-01)
    By employing a dielectric approach, the energy loss of a pair of test charged projectiles passing through a multicomponent dusty plasma, retaining two ion correlation effects is computed. The numerical results are presented ...
  • Superheating in confined Pb(110) films 
    Akhter, J I (Journal of Physics: Condensed Matter, 2001-01-01)
    The melting behaviour of Pb film embedded in an Al matrix has been investigated by a molecular dynamics simulation technique. The Sutton-Chen potential for alloys has been employed to perform these calculations. Melting ...
  • Superheating in confined Pb(110) films 
    Akhter, J I (Journal of Physics: Condensed Matter, 2001-08-16)
    The melting behaviour of Pb film embedded in an Al matrix has been investigated by a molecular dynamics simulation technique. The Sutton-Chen potential for alloys has been employed to perform these calculations. Melting ...
  • Elliptic Solitary Electron Drift Vortices in Semiconductor Piezoelectrics 
    Shah, H A; Hameed, M; Murtaza, G (Physica Scripta, 2002-01-01)
    In the present paper we investigate the propagation of electron vortices in a semiconductor piezoelectric medium. We show that nonlinear coupled upper hybrid drift-acoustic waves in a piezoelectric semiconductor plasma ...
  • Effect of Charge Fluctuations on the Debye Shielding and Energy Loss of N × M Projectiles in a Dusty Plasma 
    Sarwar, M Adnan; Mirza, Arshad M; M, Salahuddin; Qaisar, M S (Institute of Physics, 2003-01-01)
    The electrostatic potential and the energy loss by N × M projectiles propagating through a dusty plasma are derived within the frame work of dielectric theory for different dust parameters of interest. An interference ...

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