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  • 1.
    Abbas, Ghazanfar
    et al.
    KTH, School of Industrial Engineering and Management (ITM), Energy Technology. COMSATS Institute of Information Technology, Pakistan.
    Raza, Rizwan
    KTH, School of Industrial Engineering and Management (ITM), Energy Technology. COMSATS Institute of Information Technology, Pakistan.
    Ahmad, M. Ashfaq
    Khan, M. Ajmal
    Hussain, M. Jafar
    Ahmad, Mukhtar
    Aziz, Hammad
    Ahmad, Imran
    Batool, Rida
    Altaf, Faizah
    Zhu, Bin
    KTH, School of Industrial Engineering and Management (ITM), Energy Technology.
    Electrochemical investigation of mixed metal oxide nanocomposite electrode for low temperature solid oxide fuel cell2017In: International Journal of Modern Physics B, ISSN 0217-9792, Vol. 31, no 27, article id 1750193Article in journal (Refereed)
    Abstract [en]

    Zinc-based nanostructured nickel (Ni) free metal oxide electrode material Zn-0.60/CU0.20Mn0.20 oxide (CMZO) was synthesized by solid state reaction and investigated for low temperature solid oxide fuel cell (LTSOFC) applications. The crystal structure and surface morphology of the synthesized electrode material were examined by XRD and SEM techniques respectively. The particle size of ZnO phase estimated by Scherer's equation was 31.50 nm. The maximum electrical conductivity was found to be 12.567 S/cm and 5.846 S/cm in hydrogen and air atmosphere, respectively at 600 degrees C. The activation energy of the CMZO material was also calculated from the DC conductivity data using Arrhenius plots and it was found to be 0.060 and 0.075 eV in hydrogen and air atmosphere, respectively. The CMZO electrode-based fuel cell was tested using carbonated samarium doped ceria composite (NSDC) electrolyte. The three layers 13 mm in diameter and 1 mm thickness of the symmetric fuel cell were fabricated by dry pressing. The maximum power density of 728.86 mW/cm(2) was measured at 550 degrees C.

  • 2.
    De Woul, Jonas
    et al.
    KTH, School of Engineering Sciences (SCI), Theoretical Physics.
    Langmann, Edwin
    KTH, School of Engineering Sciences (SCI), Theoretical Physics.
    Fermions in two dimensions, bosonization, and exactly solvable models2012In: International Journal of Modern Physics B, ISSN 0217-9792, Vol. 26, no 22, p. 1244005-Article, review/survey (Refereed)
    Abstract [en]

    We discuss interacting fermion models in two dimensions, and, in particular, such that can be solved exactly by bosonization. One solvable model of this kind was proposed by Mattis as an effective description of fermions on a square lattice. We review recent work on a specific relation between a variant of Mattis' model and such a lattice fermion system, as well as the exact solution of this model. The background for this work includes well-established results for one-dimensional systems and the high-T c problem. We also mention exactly solvable extensions of Mattis' model.

  • 3.
    Hussain, Fida
    et al.
    COMSATS Univ Islamabad, Dept Elect Engn, Islamabad 44000, Pakistan..
    Ahmad, M. Ashfaq
    COMSATS Univ Islamabad, Dept Phys, Lahore Campus, Lahore 54000, Pakistan..
    Badshah, Saeed
    Int Islamic Univ, Dept Mech Engn, Islamabad 44000, Pakistan..
    Raza, Rizwan
    KTH, School of Industrial Engineering and Management (ITM), Energy Technology.
    Khan, M. Ajmal
    COMSATS Univ Islamabad, Dept Phys, Lahore Campus, Lahore 54000, Pakistan.;Chinese Acad Sci, Ningbo Inst Mat Technol & Engn, Ningbo 315201, Zhejiang, Peoples R China..
    Mumtaz, Saleem
    Bahauddin Zakariya Univ, Inst Chem Sci, Multan 60800, Pakistan..
    Dilshad, Saad
    COMSATS Univ Islamabad, Dept Elect Engn, Islamabad 44000, Pakistan..
    Riaz, Raja Ali
    COMSATS Univ Islamabad, Dept Elect Engn, Islamabad 44000, Pakistan..
    Hussain, M. Jafar
    Abbas, Ghazanfar
    COMSATS Univ Islamabad, Dept Phys, Lahore Campus, Lahore 54000, Pakistan..
    A modeling approach for low-temperature SOFC-based micro-combined heat and power systems2019In: International Journal of Modern Physics B, ISSN 0217-9792, Vol. 33, no 4, article id 1950001Article in journal (Refereed)
    Abstract [en]

    The world's challenge is to determine a more efficient, economical and environmental-friendly energy source to compete and replace the ongoing conventional energy resources. Solid oxide fuel cells (SOFCs) provide a highly efficient system to use divergent energy resources and have proved to provide the cleanest energy, least energy use, and lowest emissions. A techno-economic study is required to investigate the model design for SOFC-based micro-combined heat and power (m-CHP) systems for applications in terms of educational and commercial buildings. This work models and explores the optimized application of hydrogen gas-fueled SOFC-based m-CHP systems in educational buildings. Two educational departments' loads are presented and model of SOFC-based m-CHP system against the different electric power demands is performed, in order to provide a techno-economic assessment of the technology. For successful development of the technology, results are related to system rightsizing, operating strategies, thermal to electric ratios, and match between end-use, with an aim towards classifying the overall feasibility and essential application requirements.

  • 4. Luo, Wei
    et al.
    Fang, M.
    Ahuja, Rajeev
    NANOLAYERED MAX PHASES FROM ab initio CALCULATIONS2008In: International Journal of Modern Physics B, ISSN 0217-9792, Vol. 22, no 25-26, p. 4495-4499Article in journal (Refereed)
    Abstract [en]

    The advancement in new materials processing and fabrication techniques has made it possible to better control the atomistic level of structures in a way, which was not feasible only a decade ago. If one can couple this atomic control with a good understanding of the relationship between structure and properties, this will in the future lead to a significant contribution to the synthesizing of tailor-made materials. In this paper we have focused on, the structurally related nanolayered ternary compounds M(N+1)AX(N), (MAX) where N = 1, 2 or 3, M is an early transition metal, A is an A-group (mostly IIIA and IVA) element, and X is either C and/or N, which has attracted increasing interest owing to their unique properties. The general relations between the electronic structure and materials properties of MAX phases have been elaborated based on ab initio calculations.

  • 5. Zhang, Zhibin
    et al.
    Zhang, Shi-Li
    Zhu, D. H.
    Xu, H. J.
    Chen, Y.
    Formation of C54TiSi(2) on Si(100) using Ti/Mo and Mo/Ti bilayers2002In: International Journal of Modern Physics B, ISSN 0217-9792, Vol. 16, no 1-2, p. 205-212Article in journal (Refereed)
    Abstract [en]

    The effect of Mo on the formation of C54 TiSi2 on Si (100) substrates is studied using crosssectional transmission electron microscopy. For a Ti/Mo bilayer on Si, the interfacial Mo film reacts with Ti and Si to form C40 (Mo,Ti)Si-2 at 550 degreesC. Crystal grains of metastable C40 TiSi2 and equilibrium C54 TiSi2 are found in the region near the interfacial (Mo,Ti)Si-2 layer due to the template phenomenon. Increasing the temperature to 600 degreesC leads to the growth of C54 TiSi2 throughout the film. No C49 grains can be detected. The findings confirm that the usual sequence for the formation of C54 TiSi2, i.e. the C49 TiSi2 forms first followed by a phase transition to the C54 TiSi2, is altered by the interposed Mo layer. For a Mo/Ti bilayer on Si, the surface Mo layer is found to be present sequentially in (Mo,Ti)(5)Si-3 at 550 degreesC, C49 (Mo,Ti)Si-2 at 600 degreesC and C54 (Mo,Ti)Si-2 at 650 degreesC. The bulk Ti beneath forms the C54 TiSi2 following the usual route through the C49-C54 phase transition. However, this transition is now enhanced, in comparison with the C54 TiSi2 formation with pure Ti, by the C54 (Mo,Ti)Si-2 atop that plays the role as a template precisely as the interfacial C40 (Mo,Ti)Si-2.

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