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Wyszukujesz frazę "Murtaza, G." wg kryterium: Autor

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    Wyświetlanie 1-5 z 5
    Tytuł:
    Structural, Chemical Bonding, Electronic and Magnetic Properties of $XY_{3}$ (X = Al, Ga and Y = V, Nb, Cr, Mo) Compounds
    Autorzy:
    Hafeez, R.
    Murtaza, G.
    Khenata, R.
    Wong, Kin
    Naeem, S.
    Khalid, M.
    Alahmed, Z.
    Bin Omran, S.
    Powiązania:
    https://bibliotekanauki.pl/articles/1398966.pdf
    Data publikacji:
    2015-03
    Wydawca:
    Polska Akademia Nauk. Instytut Fizyki PAN
    Tematy:
    71.15.Ap
    71.20.-b
    Opis:
    The metallic behavior of the band gap of intermetallic compounds has large applications in superconductivity, nickel-metal hydrides batteries, semiconductors, and heating materials. The presence of transition elements makes them more attractive for magnetic applications. In this work we studied the structural, electronic, chemical bonding, and magnetic properties of binary intermetallic compounds $XY_3$ (X = Al, Ga and Y = V, Nb, Cr, Mo). These compounds were investigated by using full potential linearized augmented plane wave plus local orbitals method. The exchange correlation potential of generalized gradient is used. Our calculated lattice constants are in good agreement with experimental values. The band structures of these compounds are purely overlapping across the Fermi level. The bonding is mainly covalent in these compounds. The density of states of the compounds shows that the major contribution arises from d-states of anions. The investigation carried out shows that the most of these compounds have ferromagnetic nature, while few are diamagnetic. On the basis of this study it is expected that these compounds can be used as a best moulds for future study on similar compounds.
    Źródło:
    Acta Physica Polonica A; 2015, 127, 3; 770-779
    0587-4246
    1898-794X
    Pojawia się w:
    Acta Physica Polonica A
    Dostawca treści:
    Biblioteka Nauki
    Artykuł
    Tytuł:
    Physical Properties of $CsSnM_3$ (M = Cl, Br, I): A First Principle Study
    Autorzy:
    Hayatullah, -
    Murtaza, G.
    Muhammad, S.
    Naeem, S.
    Khalid, M.
    Manzar, A.
    Powiązania:
    https://bibliotekanauki.pl/articles/1399518.pdf
    Data publikacji:
    2013-07
    Wydawca:
    Polska Akademia Nauk. Instytut Fizyki PAN
    Tematy:
    71.15.Mb
    71.22.+i
    71.15.Ap
    Opis:
    First principle calculations are carried out to investigate the structural, electronic and optical properties of cubic perovskites $CsSnM_3$ (M = Cl, Br, I). The theoretically calculated lattice constants are found to be in good agreement with the experimentally measured values as compared to previous calculations. It is found that these perovskites are direct band gap semiconductors. The electrons densities reveal strong ionic bonding between Cs and halide cations while strong covalent bonding between Sn and halide cations. Optical properties of these compounds like real and imaginary parts of the dielectric functions, refractive indices, extinction coefficients, reflectivities, optical conductivities and absorption coefficients are calculated. The direct band gap nature and high absorption power of these compounds in the infrared, visible and ultraviolet energy range predicts that these perovskites can be used in optical and optoelectronic devices working in this range of the spectrum.
    Źródło:
    Acta Physica Polonica A; 2013, 124, 1; 102-107
    0587-4246
    1898-794X
    Pojawia się w:
    Acta Physica Polonica A
    Dostawca treści:
    Biblioteka Nauki
    Artykuł
    Tytuł:
    First principle analysis of electronic, optical and thermoelectric characteristics of XBiO3 (X = Al, Ga, In) perovskites
    Autorzy:
    Mahmood, Q.
    Rouf, S. A.
    Algrafy, E.
    Murtaza, G.
    Ramay, S. M.
    Mahmood, A.
    Powiązania:
    https://bibliotekanauki.pl/articles/1818225.pdf
    Data publikacji:
    2020
    Wydawca:
    Polska Akademia Nauk. Stowarzyszenie Elektryków Polskich
    Tematy:
    density functional theory
    structural stability
    optoelectronics
    thermoelectric applications
    indirect band gap semiconductors
    Opis:
    The perovskites XBiO3 (X = Al, Ga, In) have been studied in terms of mechanical, optical and thermoelectric behavior for energy harvesting application. Density functional theory is applied to study electronic, optical and thermoelectric properties of the studied materials. Structural, mechanical and thermodynamic stabilities are confirmed from the tolerance factor, Born mechanical stability and formation energy/specific heat capacity. Poisson and Plough ratios show the studied materials are ductile and have ability to withstand pressure. Band structure analysis shows the indirect band gap 3.0/2.1/1.0 eV for ABO/GBO/IBO. A complete set of optical spectra is reported by dielectric constants, refractive index, optical conduction, absorption of light and optical loss energy. Shifting of maximum absorption band to visible region increases the potential of perovskites XBiO3. Transport characteristics are also investigated by electrical conductivity, Seebeck coefficient and figure of merit.
    Źródło:
    Opto-Electronics Review; 2020, 28, 1; 8--14
    1230-3402
    Pojawia się w:
    Opto-Electronics Review
    Dostawca treści:
    Biblioteka Nauki
    Artykuł
    Tytuł:
    Effects of variable fluid properties and mixed convection on biomagnetic fluid flow and heat transfer over a stretching sheet in the presence of magnetic dipole
    Autorzy:
    Murtaza, M. G.
    Alam, Jahangir
    Tzirtzilakis, E. E.
    Shamshuddin, Md.
    Ferdows, M.
    Powiązania:
    https://bibliotekanauki.pl/articles/41191498.pdf
    Data publikacji:
    2023
    Wydawca:
    Politechnika Warszawska, Instytut Techniki Cieplnej
    Tematy:
    stretching sheet
    biomagnetic fluid
    magnetohydrodynamic
    ferrohydrodynamic
    magnetic dipole
    magnetization
    variable viscosity
    thermal conductivity
    rozciąganie arkusza
    płyn biomagnetyczny
    magnetohydrodynamika
    ferrohydrodynamika
    dipol magnetyczny
    namagnesowanie
    zmienna lepkość
    przewodność cieplna
    Opis:
    This investigations covers the numerical analysis of a steady biomagnetic fluid flow (BFD) that passed through a two dimensional stretching sheet under the influence of magnetic dipole. The effect of fluid variable viscosity and thermal conductivity are also taken into consideration as assumed to vary as linear function of temperature. Our model mathematically formulated for BFD namely blood which consist of principles of magnetohydrodynamic (MHD) and ferrohydrodynamic (FHD), where blood treated as an electrically conducting fluid as well as polarization. Using similarity transformations, the governing system of partial differential equations are transferred into system of ordinary differential equations (ODE). The resulting coupled non linear ODE is numerically solved by employing bvp4c function technique available in MATLAB software. The effects of pertinent parameters namely ferromagnetic interaction parameter, magnetic field parameter, mixed convection parameter, viscosity variation parameter, Prandtl number, thermal conductivity parameter etc are plotted and discussed adequately for velocity and temperature profile as well as skin friction coefficient and rate of heat transfer. The results revels that velocity profile decreases as enhanced values of ferromagnetic number whereas temperature profile increased. Also found that skin friction coefficient reduces and rate of heat transfer increases by increasing values of thermal conductivity parameter and viscosity variation parameter. For numerical validation a comparisons has been made for some specific values with previous investigators. We hope that the present analysis will present in bio-medical and bio-engineering sciences.
    Źródło:
    Journal of Power Technologies; 2023, 103, 4; 193-208
    1425-1353
    Pojawia się w:
    Journal of Power Technologies
    Dostawca treści:
    Biblioteka Nauki
    Artykuł
    Tytuł:
    Ab Initio Study of the Mechanical, Thermal and Optoelectronic Properties of the Cubic CsBaF₃
    Autorzy:
    Harmel, M.
    Khachai, H.
    Haddou, A.
    Khenata, R.
    Murtaza, G.
    Abbar, B.
    Bin Omran, S.
    Khalfa, M.
    Powiązania:
    https://bibliotekanauki.pl/articles/1402310.pdf
    Data publikacji:
    2015-07
    Wydawca:
    Polska Akademia Nauk. Instytut Fizyki PAN
    Tematy:
    62.20.de
    65.40.Ba
    65.40.De
    Opis:
    We have investigated the structural, elastic, electronic, optical and thermal properties of CsBaF₃ perovskite using the full-potential linearized augmented plane wave method within the generalized gradient approximation and the local density approximation. Moreover, the modified Becke-Johnson potential (TB-mBJ) was also applied to improve the electronic band structure calculations. The ground state properties such as lattice parameter, bulk modulus and its pressure derivative were calculated and the results are compared with the available theoretical data. The elastic properties such as elastic constants, anisotropy factor, shear modulus, Young's modulus and Poisson's ratio are obtained for the first time. Electronic and bonding properties are discussed from the calculations of band structure, density of states and electron charge density. The contribution of the different bands was analyzed from the total and partial density of states curves. The different interband transitions have been determined from the imaginary part of the dielectric function. The thermal effect on the volume, bulk modulus, heat capacities $C_V$ and the Debye temperature was predicted using the quasi-harmonic Debye model, in which the lattice vibrations are taken into account.
    Źródło:
    Acta Physica Polonica A; 2015, 128, 1; 34-42
    0587-4246
    1898-794X
    Pojawia się w:
    Acta Physica Polonica A
    Dostawca treści:
    Biblioteka Nauki
    Artykuł
      Wyświetlanie 1-5 z 5

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