Yazar "Us, S. Barlaz" seçeneğine göre listele

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    An FDTD based numerical analysis of microwave propagation properties in a skin-fat tissue layers
    (Elsevier Gmbh, 2013) Alisoy, H. Z.; Us, S. Barlaz; Alagoz, B. B.
    This study theoretically investigates wave propagation properties at the interface of air-skin-fat tissues for a microwave frequency of 6.8 GHz. For this proposes, propagation of the microwaves in a biological tissue model of skin-fat are numerically analyzed by using FDTD method for the transverse magnetic (TM) mode of 2D-Maxwell's equations. These analyses are conducted for various point source placements such as none-contacting, embedded to skin and embedded to fat configurations. Electric field intensity and SAR distribution across the air-skin-fat tissue layers are revealed. The energy penetration and absorption degrees of planar skin-fat tissue layers are discussed in a physical origin. The large electrical impedance mismatches between the tissue layers result in reflection of microwaves from the interface of layers. Skin layer exhibits a considerable wave reflection property due to the high reflection coefficient at air-skin and skin-fat interfaces. (C) 2013 Elsevier GmbH. All rights reserved.
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    Spatio-spectral analyses of electromagnetic wave energy absorption and heating effect
    (Elsevier Gmbh, 2014) Alisoy, H. Z.; Alagoz, B. B.; Us, S. Barlaz; Deniz, F. N.; Alagoz, S.
    This study presents a theoretical analysis method to calculate electromagnetic (EM) wave power absorption spectrum of materials by using attenuation coefficients. The heating effect of EM waves is modeled to analyze spectral distribution of temperature rises inside material body as a result of EM wave power absorption. These analyses are very useful for the investigation of electromagnetic wave-material interaction on the bases of electro-physical material parameters (permittivity, permeability and conductivity). An illustrative analysis of spatio-spectral distribution of EM wave energy absorption and resulting heating effect were conducted for muscle tissues and the results are discussed. (C) 2014 Elsevier GmbH. All rights reserved.