WoS İndeksli Yayınlar Koleksiyonu

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Browsing WoS İndeksli Yayınlar Koleksiyonu by Publisher "AIP Publishing"

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    Article
    Citation - WoS: 5
    Citation - Scopus: 4
    Graphene/SOI-based self-powered Schottky barrier photodiode array
    (AIP Publishing, 2022) A. Yanilmaz; M. Fidan; O. Unverdi; C. Celebi; Fidan, M.; Çelebi, C.; Yanilmaz, A.; Unverdi, O.
    We have fabricated a four-element graphene/silicon on insulator (SOI) based Schottky barrier photodiode array (PDA) and investigated its optoelectronic device performance. In our device design monolayer graphene is utilized as a common electrode on a lithographically defined linear array of n-type Si channels on a SOI substrate. As revealed by wavelength resolved photocurrent spectroscopy measurements each element in the PDA structure exhibited a maximum spectral responsivity of around 0.1 A/W under a self-powered operational mode. Time-dependent photocurrent spectroscopy measurements showed excellent photocurrent reversibility of the device with ~1.36 and ~1.27 mu s rise time and fall time respectively. Each element in the array displayed an average specific detectivity of around 1.3 x 10(12) Jones and a substantially small noise equivalent power of ~0.14 pW/Hz(-1/2). The study presented here is expected to offer exciting opportunities in terms of high value-added graphene/Si based PDA device applications such as multi-wavelength light measurement level metering high-speed photometry and position/motion detection.
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    Multi-objective aerodynamic design optimization of a new engine intake electromagnetic wave blocker
    (AIP Publishing, 2025) Cihat Emre Ustun; Ilhami Unal; Nurettin Ozbey; Nail Bugra Kilic; Nursev Erdogan; Ozkan Altay; Mustafa Tutar
    A new engine intake electromagnetic wave blocker (EMWB) in a straight duct configuration is proposed as an alternative to S-shaped air intake ducts for reducing radar and infrared signatures of aircraft. A computational fluid dynamics model is developed and verified against an existing S-duct air intake study. Ten geometric parameters of the baseline EMWB are selected as design variables for a multi-objective optimization study. The design space is extensively explored with 68 configurations applying the constraints of pressure recovery (PR) > 0.97 and distortion coefficient (DC60) < 0.06. This process yields 16 feasible designs from which the best performing model in terms of PR and DC60 is selected as the optimized EMWB. The electromagnetic model and experimental setup are then established. Radar cross-sectional measurements of the optimized EMWB model demonstrate significant improvements: aerodynamic performance is increased by 8.1% for PR and 14% for DC60 while the radar cross section is decreased by 51%. These results suggest that the optimized EMWB in a straight duct configuration offers a promising alternative to S-shaped ducts for reducing aircraft engine signatures while maintaining aerodynamic performance.