Browsing by Keywords "Frequency"

Now showing items 1-10 of 10

    • Accurate simulation of reflector antennas by the complex source-dual series approach 

      Oğuzer, T.; Altıntaş, A.; Nosich, A. I. (Institute of Electrical and Electronics Engineers, 1995-08)
      The radiation from circular cylindrical reflector antennas is treated in an accurate manner for both polarizations. The problem is first formulated in terms of the dual series equations and then is regularized by the ...

    • Acoustic microscopy with mechanical scanning—A review 

      Quate, C. F.; Atalar, Abdullah; Wickramasinghe, H. K. (IEEE, 1979-08)
      Acoustic waves in liquids are known to have wavelengths comparable to that of visible light if the frequency is in the gigahertz range. The phenomena of Brillouin scattering in liquids is based on such waves. In helium ...

    • The almost magical world of metamaterials 

      Özbay, Ekmel (IEEE, 2008-11)
      In recent years, there has been a burgeoning interest in rapidly growing field of metamaterials due to their unprecedented properties unattainable from ordinary materials. Veselago pointed out that a material exhibiting ...

    • Control of the Responsivity and the detectivity of superconductive edge-transition YBa2Cu3O7-x bolometers through substrate properties 

      Fardmanesh, M.; Scoles, K. J.; Rothwarf, A. (Optical Society of America, 1999-08-01)
      The detectivity D* limits of YBa2Cu3O7-x bolometer on 0.05-cm-thick crystalline substrates are investigated, and a method to increase D* to greater than 10(9) (cm Hz(1/2))/W at a 20-mu m wavelength is proposed. Because the ...

    • Imaging flaws close to surface using focused surface acoustic waves 

      Köymen, Hayrettin; Atalar, Abdullah; Çiloğlu, T.; Önder, Murat; Uzel, Ç.; Yavuz, H. (IEEE, 1986-11)
      The resolving power and detection ability of the focused surface acoustic wave (SAW) imaging modality is investigated in this paper. In this mode of imaging, conical bulk acoustic waves are used to generate and focus leaky ...

    • Major sources of collocational errors made by EFL learners at Koya University 

      Hama, Hawraz Q. (Bilkent University, 2010)
      The aim of the present study was to explore the main sources of collocational errors made by learners of English as Foreign Language (EFL). To address this issue, 40 Kurdish seniors studying EFL at Koya University’s ...

    • Micromachinable leaky wave air transducers 

      Değertekin, F. L.; Atalar, Abdullah; Khuri-Yakub, B. T. (IEEE, 1997-11)
      In this paper, ultrasonic air transducers which use the lowest order antisymmetric (A/sub 0/) mode Lamb waves in a thin plate as a means of efficient coupling of ultrasonic energy to air are discussed. For a silicon plate ...

    • Semantic argument frequency-based multi-document summarization 

      Aksoy, Cem; Buğdaycı, Ahmet; Gür, Tunay; Uysal, İbrahim; Can, Fazlı (IEEE, 2009-09)
      Semantic Role Labeling (SRL) aims to identify the constituents of a sentence, together with their roles with respect to the sentence predicates. In this paper, we introduce and assess the idea of using SRL on generic ...

    • Simulating a wavelength-size 2-D lens with an accurate numerical method 

      Boriskin, A. V.; Nosich, A. I.; Altıntaş, Ayhan (IEEE, 2001)
      The effect of a localized light source directivity improvement due to an arbitrarily shaped dielectric cylinder taken as a 2-D model of a dielectric lens is studied. The source is simulated by the field of a complex ...

    • Surface-modified bacterial nanofibrillar PHB scaffolds for bladder tissue repair 

      Karahaliloǧlu, Z.; Demirbilek, M.; Şam, M.; Saǧlam, N.; Mizrak, A. K.; Denkbaş, E. B. (Taylor and Francis Ltd., 2016)
      The aim of the study is in vitro investigation of the feasibility of surface-modified bacterial nanofibrous poly [(R)-3-hydroxybutyrate] (PHB) graft for bladder reconstruction. In this study, the surface of electrospun ...