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Träfflista för sökning "WFRF:(Khan Ahmad Raza) srt2:(2011-2014)"

Sökning: WFRF:(Khan Ahmad Raza) > (2011-2014)

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1.
  • Abbas, Ghazanfar, et al. (författare)
  • Electrochemical study of nanostructured electrode for low-temperature solid oxide fuel cell (LTSOFC)
  • 2014
  • Ingår i: International Journal of Energy Research. - : Hindawi Limited. - 0363-907X .- 1099-114X. ; 38:4, s. 518-523
  • Tidskriftsartikel (refereegranskat)abstract
    • Zn-based nanostructured Ba0.05Cu0.25Fe0.10Zn0.60O (BCFZ) oxide electrode material was synthesized by solid-state reaction for low-temperature solid oxide fuel cell. The cell was fabricated by sandwiching NK-CDC electrolyte between BCFZ electrodes by dry press technique, and its performance was assessed. The maximum power density of 741.87 mW-cm(-2) was achieved at 550 degrees C. The crystal structure and morphology were characterized by X-ray diffractometer (XRD) and SEM. The particle size was calculated to be 25 nm applying Scherer's formula from XRD data. Electronic conductivities were measured with the four-probe DC method under hydrogen and air atmosphere. AC Electrochemical Impedance Spectroscopy of the BCFZ oxide electrode was also measured in hydrogen atmosphere at 450 degrees C.
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2.
  • Tabassam, Ahmad Ali, et al. (författare)
  • Spectrum estimation and spectrum hole opportunities prediction for cognitive radios using higher-order statistics
  • 2011
  • Ingår i: 2011 Wireless Advanced (WiAd 2011). - Piscataway, NJ : IEEE. - 9781457701092 - 9781457701108 - 9781457701085 ; , s. 213-217
  • Konferensbidrag (refereegranskat)abstract
    • Cognitive Radio (CR) is a wireless advanced technology which can utilize an unlicensed as well as a licensed spectrum without a harmful interference to the primary users. An unbiased consistent spectrum estimator is required for the primary user’s detection (sensing) for distinguishing the narrow band signals in a noisy environment. Cognitive radio’s hardware solutions available in a commercial market are frequency band constrained at RF Front-End. In multi-dimensional radio spectrum space any of the dimension: time, frequency, code or space can be used as a transmission opportunity. The spectrum hole time opportunistic prediction is a promising solution to determine the free time slots for transmission within a frequency band. This paper presents classical and parametric statistical spectrum estimators for primary user’s detection. It also presents statistical auto-regressive and moving average predictive modeling for grey-hole spectrum opportunities prediction in a time domain for cognitive radios where frequency, code and space (geographical location) are operational constraints. A prototype system for a cognitive radio is built on top of the software-defined radio in a MATLAB/-Simulink and interfaced with an USRP2 main-board and RFX2400 daughter-board from Ettus Research LLC. © 2011 IEEE.
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