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    Coexistence of the δl and δTc flux pinning mechanism in nano-Si doped MgB2 

    Type: Journal Paper
    Author : شعبان رضا قربانی; X. L. Wang; M. S. H. Hossain; S. X. Dou; Sung-Ik Lee; Shaban Reza Ghorbani
    Year: 2010
    Abstract:

    The flux pinning mechanisms of nano-Si-doped MgB2 are reported in this work. The field

    dependence of the critical current density, Jc(B), was analyzed within the collective pinning

    model. We found that the mechanisms for both δl...

    Magnetic vortex flux pinning in silicone-oil doped MgB2 

    Type: Journal Paper
    Author : Sung-Ik Lee; شعبان رضا قربانی; Shaban Reza Ghorbani
    Year: 2010
    Abstract:

    The field dependence of the critical current density, jc (B), of MgB2 doped with 10 weight % liquid precursor, silicone oil, was measured. The enhanced jc (B) compared to the pure MgB2 was obtained. An observed temperature dependence...

    Critical Current Density and Intergranular Coupling Study of the Dysprosium Oxide Nanoparticle Added Bi1.6Pb0.4Sr2Ca2Cu3Oy Superconductor 

    Type: Journal Paper
    Author : امیر زلتی; احمد امیرآبادی زاده; احمد کمپانی; هادی سلامتی; J. E. Sonier; Ahmad Kompany
    Year: 2014
    Abstract:

    The dysprosium oxide nanoparticles’ addition effects on structural, DC electrical resistivity, critical current density, and AC magnetic susceptibility properties of polycrystalline Bi1.6Pb0.4Sr2Ca2Cu samples are investigated. X-ray diffraction (XRD...

    The effect of anisotropy of Hc2 on transport current in silicone oil- doped MgB2 superconductor 

    Type: Journal Paper
    Author : شعبان رضا قربانی; M. Fahimi; Shaban Reza Ghorbani
    Year: 2015
    Abstract:

    The temperature and magnetic field dependences of the critical current density in silicone oil doped MgB2 polycrystalline samples have been investigated by magnetic measurements. The upper critical magnetic field anisotropy, γ=H_c2^(⟘c)/H_c2^(...
    c), dependence of the critical current density, Jc(B), were analyzed within the percolation model . The calculated critical current densities based on percolation theory are in agreement with the experimental data. It was found that the anisotropy...

    Hydrostatic pressure induced transformation from δT_c to δl pinning in MgB2 

    Type: Journal Paper
    Author : Babar Shabbir; X. L. Wang; شعبان رضا قربانی; S. X. Dou; Feixiang Xiang; Shaban Reza Ghorbani
    Year: 2015
    Abstract:

    The impact of hydrostatic pressure up to 1.2 GPa on the critical current density (Jc) and the nature of the pinning mechanism in MgB2 have been investigated within the framework of the collective theory. We found that the hydrostatic pressure can...

    Comparison of flux pinning in Si- and SiCl4-doped MgB2 superconductors: Evidence for coexistence of different pinning mechanisms 

    Type: Journal Paper
    Author : شعبان رضا قربانی; محمد حسین زاده; X L Wang; Shaban Reza Ghorbani; mohammad hosseinzadeh
    Year: 2015
    Abstract:

    The transport and magnetic properties of 5 wt % nano-Si- and 10 wt % SiCl4-doped MgB2 have been studied by measuring the resistivity, ρ, critical current density, Jc, irreversibility field, Hirr, and upper critical field, Hc2. Similar scattering...

    Flux pinning mechanism in codoped-MgB2 with Al2O3 and SiC 

    Type: Journal Paper
    Author : نرجس سادات کیافیروزکوهی; شعبان رضا قربانی; هادی عربی; Narjess Sadat Kia Firoozkoohi; Shaban Reza Ghorbani; Hadi Arabi
    Year: 2018
    Abstract:

    MgB2 superconductor samples, co-doped with 0.02 wt of Al2O3 and 0.02 wt SiC, have been examined by M-H loop measurements and calculation of the critical current density based on the Bean model. Normalized volume pinning force, f= F/Fmax, as a...

    Stability analysis of nonlinear self-excited vibration in cold rolling main drive system 

    Type: Conference Paper
    Publisher: IEEE
    Year: 2014

    Session: RMO3C: mm-Wave & terahertz frequency generation techniques 

    Type: Conference Paper
    Author : Entesari, Kamran , Floyd, Brian
    Publisher: IEEE
    Year: 2014

    Flux pinning mechanism in SiC and nano-C doped MgB2: Evidence for transformation from δTc to δl pinning 

    Type: Journal Paper
    Author : شعبان رضا قربانی; G Farshidnia; X L Wang; S X Dou; Shaban Reza Ghorbani
    Year: 2014
    Abstract:

    Magnetic and transport properties of 10 wt% SiC doped MgB2 and 5 wt% nano-C doped MgB2 were studied by resistance and critical current density measurements. The results showed improvement of the critical current density for the MgB2 superconductor...

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