Yazar "Usman, Muhammad" seçeneğine göre listele

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    Dithizone, carminic acid and pyrocatechol violet dyes sensitized metal (Ho, Ba& Cd) doped TiO2/CdS nanocomposite as a photoanode in hybrid heterojunction solar cell
    (Elsevier Sci Ltd, 2022) Ullah, Naimat; Shah, Syed Mujtaba; Erten-Ela, Sule; Ansir, Rotaba; Hussain, Hazrat; Qamar, Samina; Usman, Muhammad
    Considering the great importance of nanocomposite based photo-active nanomaterials for a variety of elec-tronics, photonics and photovoltaics application, it is always worth considering to synthesize new hetreos-tructure. This paper describes the sol-gel and hydrothermal synthesis of metal (holmium, barium, and cadmium) doped TiO2/CdS nanocomposites for photoanode applications. Various characterization techniques, including XRD, FTIR, UV-VIS, EDX, and SEM were used to examine the synthesized heterostructures. The band gap of pure TiO2 NPs is 3.10 eV, which was effectively decreased to 2.16 eV by doping and coupling with CdS. The nano-material's crystallinity, crystallite size, morphology and elemental composition were determined by XRD, SEM and EDX, respectively. As sensitizers, the organic dyes dithizone, carminic acid, and pyrocatechol violet were used. FTIR was used to analyze the effective dye grafting on the surface of nanomaterials. In the presence of hole conducting P3HT polymer as solid state electrolyte, the sensitized materials were evaluated for solid state dye -sensitized solar cells. Compared to the reference device, Cd-TiO2/CdS photosensitized using Pyrocatechol violet dye demonstrated the highest efficiency of 2.68% (0.82%). Other parameters of this device, including open circuit voltage (Voc) and short circuit current (Jsc), were determined to be 16.97 mA cm2 and 0.41V, respectively.
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    Homotopy analysis method for fractional partial differential equations
    (Academic Journals, 2011) Mohyud-Din, Syed Tauseef; Yildirim, Ahmet; Usman, Muhammad
    This paper applies the homotopy analysis method (HAM) to obtain analytical solutions of fractional heat- and wave-like equations with variable coefficients. The applications of the homotopy analysis method were extended to derive analytical solutions in the form of a series with easily computed terms for these generalized fractional equation. Some examples are presented to show the efficiency and simplicity of the method.
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    A reliable algorithm for physical problems
    (Academic Journals, 2011) Usman, Muhammad; Yildirim, Ahmet; Mohyud-Din, Syed Tauseef
    This paper gives a detailed and comprehensive study of a reliable algorithm which is called the Modified Decomposition Method (MDM) and is mainly due to Geijji and Jafari to solve linear and nonlinear problems of physical nature. It has been shown that the MDM is very easy to implement and is fully compatible with the nonlinear nature of the physical problems. Moreover, this algorithm is independent of the inbuilt deficiencies of most of the previous techniques. Several examples are given to re-confirm the reliability and efficiency of the algorithm.