Now showing items 24085-24104 of 25391

    • Two-channel decentralized integral-action controller design 

      Gündeş, A. N.; Özgüler, A. B. (IEEE, 2002)
      We propose a systematic controller design method that provides integral-action in linear time-invariant two-channel decentralized control systems. Each channel of the plant is single-input-single-output, with any number ...
    • Two-dimensional Bose condensates in a harmonic trap 

      Tanatar, Bilal (2002)
      We study the condensate wave function of a two-dimensional Bose condensate in an harmonic trap potential using the recently proposed mean-field equation that takes into account the correct dimensionality effect. We compare ...
    • Two-dimensional Bose polaron using diffusion Monte Carlo method 

      Akatürk, Emre; Tanatar, Bilal (World Scientific Publishing, 2019-09)
      We investigate the properties of a mobile impurity immersed in a two-dimensional (2D) Bose gas at zero temperature using quantum Monte Carlo (QMC) methods. The repulsive boson–boson and impurity-boson interactions are ...
    • Two-dimensional boson-fermion mixtures 

      Subaşi, A.L.; Sevinçli, S.; Vignolo P.; Tanatar, Bilal (2009)
      Using mean-field theory, we study the equilibrium properties of boson-fermion mixtures confined in a harmonic pancake-shaped trap at zero temperature. When the modulus of the s -wave scattering lengths are comparable to ...
    • Two-dimensional boson-fermion mixtures in harmonic traps 

      Tanatar, Bilal; Erdemir, E. (Elsevier Science B.V., 2003)
      The density profiles of bosonic and fermionic components in a system of trapped two-dimensional (2D) boson-fermion (BF) mixture are studied. We employ the variational approach to minimize the total energy functional of the ...
    • Two-dimensional C / BN core / shell structures 

      Cahangirov, S.; Çıracı, Salim (American Physical Society, 2011)
      Single-layer core-shell structures consisting of graphene as the core and hexagonal boron nitride as the shell are studied using the first-principles plane-wave method within density functional theory. Electronic energy ...
    • Two-dimensional complex parity-time-symmetric photonic structures 

      Turduev, M.; Botey, M.; Giden, I.; Herrero, R.; Kurt, H.; Özbay, Ekmel; Staliunas, K. (American Physical Society, 2015-02)
      We propose a simple realistic two-dimensional complex parity-time-symmetric photonic structure that is described by a non-Hermitian potential but possesses real-valued eigenvalues. The concept is developed from basic ...
    • Two-dimensional computational modeling of thin film evaporation 

      Akkuş, Y.; Tarman, H. I.; Çetin B.; Dursunkaya, Z. (Elsevier Masson, 2017)
      A considerable amount of the evaporation originates from the close vicinity the three-phase contact line in an evaporating extended meniscus due to the low thermal resistance across the ultra thin film. Evaporation taking ...
    • Two-dimensional ferroelectric photonic crystals: Optics and band structure 

      Simsek S.; Mamedov, A. M.; Özbay, Ekmel (Taylor & Francis Inc., 2013-09-20)
      In this report we present an investigation of the optical properties and band structure calculations for the photonic structures based on the functional materials- ferroelectrics. A theoretical approach to the optical ...
    • Two-dimensional FIR filters 

      Ansari, R.; Çetin, A. Enis (CRC Press, 2003)
      In this chapter, methods of designing two-dimensional (2-D) finite-extent impulse response (FIR) discrete-time filters are described. Two-dimensional FIR filters offer the advantages of phase linearity and guaranteed ...
    • Two-dimensional fluorinated boron sheets: mechanical, electronic, and thermal properties 

      Peköz, R.; Konuk, M.; Kilic, M. E.; Durgun, Engin (American Chemical Society, 2018)
      The synthesis of atomically thin boron sheets on a silver substrate opened a new area in the field of two-dimensional systems. Similar to hydrogenated and halogenated graphene, the uniform coating of borophene with fluorine ...
    • Two-dimensional fractional Fourier transform and its optical implementation 

      Şahin, Ayşegül (Bilkent University, 1996)
      The IVactional Fourier transform of order a is defined in a manner sucli that tlu' common Fourier transform is a special case with order a = 1. Tlie definition is easil}^ extended to two dimensions just repeating the ...
    • Two-dimensional left-handed metamaterial with a negative refractive index 

      Aydın, Koray; Güven, Kaan; Özbay, Ekmel (IOP, 2006)
      We present a two-dimensional metamaterial with left-handed properties in a certain frequency range where both effective dielectric permittivity and magnetic permeability is simultaneously negative. A wedge-shaped metamaterial ...
    • Two-dimensional Mellin and mel-cepstrum for image feature extraction 

      Çakır, Serdar; Çetin, A. Enis (Springer, Dordrecht, 2010)
      An image feature extraction method based on two-dimensional (2D)Mellin cepstrum is introduced. The concept of one-dimensional (1D) melcepstrum which is widely used in speech recognition is extended to two-dimensions both ...
    • Two-dimensional mesoporous vanadium phosphate nanosheets through liquid crystal templating method toward supercapacitor application 

      Mei, P.; Kaneti, Y. V.; Pramanik, M.; Takei, T.; Dag, Ö.; Sugahara, Y.; Yamauchi, Y. (Elsevier, 2018)
      Mesoporous vanadium phosphate (VOPO4) nanosheets have been successfully synthesized through an easy and reproducible lyotropic liquid crystals (LLC) templating approach for the first time. Using the triblock copolymer ...
    • Two-dimensional micromechanical bimorph arrays for detection of thermal radiation 

      Manalis, S. R.; Minne, S. C.; Quate, C. F.; Yaralioglu, G. G.; Atalar, Abdullah (American Institute of Physics, 1997-06-16)
      We demonstrate that two-dimensional arrays of micromechanical bimorphs can be used as thermal sensors to image infrared (IR) radiation. A density of 100 pixels per mm2 is achieved by coiling a bimorph beam into the shape ...
    • Two-dimensional packing algorithms for layout of disconnected graphs 

      Dogrusoz, U. (Elsevier, 2002)
      We present and contrast several efficient two-dimensional packing algorithms for specified aspect ratio. These near-linear algorithms are based on strip packing, tiling, and alternate-bisection methodologies and can be ...
    • Two-dimensional phononic band structure of archimedean-logarithmic spiral-based slabs 

      Palaz, S.; Oltulu, O.; Mamedov, Amirullah M.; Özbay, Ekmel (Taylor & Francis, 2019-08-16)
      We present band structure results for elastic waves in periodic composite materials consisting of a spiral scatterer shape embedded in a uniform silicon matrix. The material of the scatterer is tungsten as a high density ...
    • Two-dimensional pnictogens: a review of recent progresses and future research directions 

      Ersan, Fatih; Keçik, Deniz; Özçelik, V. O.; Kadıoğlu, Yelda; Üzengi-Aktürk, O.; Durgun, Engin; Aktürk, Ethem; Çıracı, Salim (American Institute of Physics, 2019)
      Soon after the synthesis of two-dimensional (2D) ultrathin black phosphorus and fabrication of field effect transistors thereof, theoretical studies have predicted that other group-VA elements (or pnictogens), N, As, Sb, ...
    • Two-dimensional x-ray photoelectron spectroscopy for composite surface analysis 

      Süzer, Şefik; Sezen, H.; Dâna, A. (2008)
      We describe a method for obtaining two-dimensional X-ray photoelectron spectroscopic data derived from the frequency dependence of the XPS peaks recorded under electrical square-wave pulses, which control and affect the ...