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  1. No Access

    Article

    Order and phase ambiguities correction in the ICA based separation of speech signals

    Independent component analysis (ICA) blindly separates mixed recorded signals and is employed in various engineering disciplines like speech, biomedical, communication, robotics, leakage detection, vibration a...

    Z. Uddin, F. A. Orakzai, A. Qamar in International Journal of Speech Technology (2020)

  2. No Access

    Article

    Effects of Starvation and Thermal Stress on the Thermal Tolerance of Silkworm, Bombyx mori: Existence of Trade-offs and Cross-Tolerances

    Organisms, in nature, are often subjected to multiple stressors, both biotic and abiotic. Temperature and starvation are among the main stressors experienced by organisms in their developmental cycle and the r...

    A H Mir, A Qamar in Neotropical Entomology (2018)

  3. Article

    Open Access

    X-ray spectroscopic study of amorphous and polycrystalline PbO films, α-PbO, and β-PbO for direct conversion imaging

    We investigated the electronic structure of Lead Oxide (PbO) – one of the most promising photoconductor materials for direct conversion x-ray imaging detectors, using soft x-ray emission and absorption spectro...

    A. Qamar, K. LeBlanc, O. Semeniuk, A. Reznik, J. Lin, Y. Pan… in Scientific Reports (2017)

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  4. No Access

    Article

    Arbitrary electron acoustic waves in degenerate dense plasmas

    A theoretical investigation is carried out of the nonlinear dynamics of electron-acoustic waves in a collisionless and unmagnetized plasma whose constituents are non-degenerate cold electrons, ultra-relativist...

    Ata-ur Rahman, A. Mushtaq, A. Qamar, S. Neelam in Indian Journal of Physics (2017)

  5. No Access

    Article

    Ion Streaming Instabilities in Pair Ion Plasma and Localized Structure with Non-Thermal Electrons

    Pair ion plasma with a fraction of non-thermal electrons is considered. We investigate the effects of the streaming motion of ions on linear and nonlinear properties of unmagnetized, collisionless plasma by us...

    M. Nasir Khattak, A. Mushtaq, A. Qamar in Brazilian Journal of Physics (2015)

  6. No Access

    Article

    Ion-temperature-gradient driven modes in dust-contaminated plasma with nonthermal electron distribution and dust charge fluctuations

    The effect of nonthermal electrons on ion-temperature-gradient (ITG) driven modes is investigated in the presence of variable dust charge and ion shear flow. The dust charge fluctuating expression is obtained ...

    U. Zakir, Q. Haque, A. Qamar, Arshad M. Mirza in Astrophysics and Space Science (2014)

  7. No Access

    Article

    Kadomtsev–Petviashvili equation for solitary waves in warm dense astrophysical electron-positron-ion plasmas

    Theoretical investigation is carried out to understand the dynamics and stability of three dimensional ion solitary waves propagating in dense plasma comprising of ultra-relativistic degenerate electrons and p...

    Ata-ur Rahman, S. A. Khan, A. Qamar in Astrophysics and Space Science (2013)

  8. No Access

    Article

    Fractures of the distal third of the clavicle treated by hook plating

    We retrospectively assessed the union and shoulder function following hook plate fixation in 18 patients with Neer type 2 fractures of the lateral end of the clavicle. The average age was 40 (range 22–62) year...

    A.D. Tambe, P. Motkur, A. Qamar, S. Drew, S.M. Turner in International Orthopaedics (2006)

  9. No Access

    Article

    Upper Bound to the Density Jump at the Boundary of the Earth's Inner Core

    THE Earth has an inner core about the size of the Moon. Convincing observations of the seismic waves PKiKP, reflected at steep angles from the inner core boundary (ICB), were announced by Engdahl et al. (annual m...

    BRUCE A. BOLT, A. QAMAR in Nature (1970)