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    Designing of BiFe2O3@NiCoS@rGO nanocomposite electrode: A versatile platform for high-performance energy storage and electrolyte SIW/AN
    (Elsevier Ltd., 2025) Mümtaz, Muhammad Azhar; Afzal, Amir Muhammad; Waris, Muhammad Hamza; Ali, Muhammad; Iqbal, Muhammad Waqas; Alqarni, Areej S.; Issa, Shams A.M.; Zakaly, Hesham M.H.
    A comprehensive investigation of new materials and compositional modifications has made high-performance hybrid supercapacitor electrodes. This work mainly focuses on the synthesis of nickel cobalt sulfide (NiCoS) by hydrothermal methods and then adding bismuth ferrite (BiFe2O3) and the measurement of the electrochemical properties. The “salt in water” (SIW) solutions, which are super-concentrated aqueous electrolytes, enable a significant reduction in water activity and increase the electrochemical stability window, is utilized. The electrochemical analysis is performed using the two and three-electrode systems. The BiFe2O3@NiCoS@rGO electrode attained a noteworthy maximum capacity (Qs) of 393.7 mAhg−1 in a three-electrode assembly. The BiFe2O3@NiCoS@rGO//A.C showed a considerable Qs of 52.3 mAh/g, an improved energy density (Ed) of 79.2 W h kg−1, and a high power density (Pd) of 2.2 kW kg−1 in two electrode systems. The device has undergone extensive testing, with up to 5000 cycles, and has demonstrated an exceptional capacity retention rate of 88.2 %. Based on these intriguing findings, the BiFe2O3@NiCoS@rGO nano-composite displays immense promise for developing electrodes in advanced hybrid supercapacitors. © 2024 Elsevier B.V.
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    A method for solving bipolar fuzzy complex linear systems with real and complex coefficients
    (Springer Science and Business Media Deutschland GmbH, 2022) Akram, Muhammad; Ali, Muhammad; Allahviranloo, Tofigh
    An extensive variety of human decision making is based on two-sided or bipolar cognitive assessment of a positive side and a negative side. Zhang’s bipolar fuzzy set is represented as {?(x,y)|(x,y)?[-1,0]×[0,1]}.The multiagent decision analysis is based on bipolar judgment of a positive side and a negative side. In this paper, we consider the issues posed by bipolar fuzzy linear systems (BFLSs) and bipolar fuzzy complex linear (BFCL) systems of equations with real and complex coefficients. Primarily, we find the solution of the BFLS of equations by the resort into two parts: one is negative(?) and other is positive(?) n× n linear fuzzy systems; to this aim, we use n× n bipolar fuzzy center system and 2 n× 2 n bipolar fuzzy width system. We describe the fundamentals of proposed method with the aid of n= 2 , 5 -dimensional numerical examples, and we get the weak and strong solutions of the system. Subsequently, we describe a technique to solve BFCL systems of equations whose coefficients are real and complex by a pair of positive(?) and negative(?) n× n real and complex crisp linear systems; to this aim, we use bipolar fuzzy complex center and width. Ultimately, we use our proposed technique to solve a current flow circuit which is defined in terms of a BFCL system with complex coefficients, and we get the unknown current in the form of bipolar fuzzy complex number. © 2021, The Author(s), under exclusive licence to Springer-Verlag GmbH Germany, part of Springer Nature.