DSpace@Çankaya

Yazar "Çankaya Üniversitesi, Mühendislik Fakültesi, Elektronik ve Haberleşme Mühendisliği" için Mühendislik Fakültesi listeleme

Yazar "Çankaya Üniversitesi, Mühendislik Fakültesi, Elektronik ve Haberleşme Mühendisliği" için Mühendislik Fakültesi listeleme

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  • Minimization effects on scintillations of sinusoidal Gaussian beams in strong turbulence 
    Gerçekçioğlu, Hamza; Baykal, Yahya (IOP Publishing Ltd, 2011-11)
    Minimization effects on the on-axis scintillation index of cos Gaussian (cG) and cosh Gaussian (chG) beams are studied in strong turbulence. In our formulation, the unified solution of the Rytov method, which imposes spatial ...
  • Minimization of scintillation index against displacement parameters 
    Eyyuboğlu, Halil T.; Gerçekçioğlu, Hamza; Baykal, Yahya (Elsevier Science, 2008-09-01)
    For sinusoidal beams, minimization of scintillation index is carried out against the displacements parameters. It is found-that x-y asymmetric cosh-Gaussian beam fulfills the requirements of such optimum beam. Our minimization ...
  • Mode coupling in vortex beams 
    Eyyuboğlu, Halil T. (Elsevier Science Ltd, 2018-05)
    We examine the mode coupling in vortex beams. Mode coupling also known as the crosstalk takes place due to turbulent characteristics of the atmospheric communication medium. This way, the transmitted intrinsic mode of the ...
  • Modeling of an interface between isorefractive media by a resistive surface 
    Başdemir, Hüsnü Deniz (Optical Soc Amer, 2018-02-20)
    In this study, the scattering of plane waves by a half-plane with different face impedances, which lie between isorefractive media, is analyzed. A new approach for the solution of this scenario is proposed. According to ...
  • Modified diffraction theory of Kirchhoff 
    Umul, Yusuf Ziya (Optical Soc Amer, 2008-08)
    The diffraction theory of Kirchhoff is reinterpreted and a new form of a surface diffraction integral is developed by using the axioms of the modified theory of physical optics, which leads to the exact scattered fields ...
  • Modified Theory of Physical Optics Solution of Impedance Half Plane Problem 
    Umul, Yusuf Ziya (IEEE-Inst Electrical Electronics Engineers Inc, 2006-07)
    The scattering of electric polarized plane waves from an impedance half plane problem is examined by the method of modified theory of physical optics (MTPO). Two integrals, consisting of incident and reflected scattered ...
  • Molecular dynamics of thermal vibration effects: Ar + Ni(100) collision system 
    Hundur, Yakup; Güvenç, Büşra; Hippler, Rainer (Elsevier Science, 2010-04)
    In this work constant energy molecular dynamics simulations are achieved for investigating sputtering process of Ar + Ni(1 0 0) collision system. The Ni crystal is imitated by an embedded-atom potential, whereas the ...
  • Molecular dynamics simulation of melting behaviour of small gold clusters: Au-N (N=12-14) 
    Yıldırım, Erdem Kamil; Atış, Murat; Güvenç, Ziya B. (IOP Publishing ltd, 2007-01)
    We have investigated the melting behaviour of AuN (N = 12 - 14) clusters by means of molecular dynamics simulation on the basis of the Voter - Chen version of the embedded-atom method. The melting behaviour of the clusters ...
  • Molecular dynamics study of a thermal expansion coefficient: Ti bulk with an elastic minimum image method 
    Hundur, Yakup; Hippler, Rainer; Güvenç, Ziya B. (IOP Publishing LTD, 2006-05)
    Linear thermal expansion coefficient (TEC) of Ti bulk is investigated by means of molecular dynamics simulation. The elastic minimum image convention of periodic boundary conditions is introduced to allow the bulk to adjust ...
  • MTPO based potential function of the boundary diffraction wave theory 
    Umul, Yusuf Ziya (Elsevier Science, 2008-09)
    A novel potential function is introduced by using the modified theory of physical optics integrals for a perfectly conducting half-plane. The function is valid for arbitrary aspects of observation. The line integration of ...
  • Multiport analysis by pade approximation 
    Şener, Göker (E M W Publishing, 2012)
    In this paper, a new method to analyze arbitrary shaped microstrip patch antennas is introduced. This method uses the multiport network model (MNM) together with a mathematical approximation called the "Pade approximation" ...
  • New Dual Band Dual-Mode Microstrip Patch Bandpass Filter Designs Based On Sierpinski Fractal Geometry 
    Mezaal, Yaqeen S.; Eyyuboğlu, Halil T.; Ali, Jawad K. (IEEE, 2013-04-06)
    Dual band dual mode chebychev microstrip bandpass filter designs are introduced for first time in this paper. The proposed filter designs are based on the use of dual mode square slotted patch microstrip resonator. These ...
  • New Upper Bounds for the Computation of Complementary Error Function 
    Gazi, Orhan (2012)
    In this article we provide tighter upper bounds for complementary error function which is a monotonically decreasing function widely used in communication theory. The provided bounds approach the exact value in the ...
  • Non-Kolmogorov spectrum scintillation aspects of dark hollow and flat topped beams 
    Eyyuboğlu, Halil T.; Cai, Yangjian (Elsevier Science Bv, 2012-03-15)
    The scintillation aspects of dark hollow (DH) and fiat topped (FT) beams propagating in the turbulent atmosphere containing the non-Kolmogorov power spectrum are investigated. It is found that low scintillations will occur ...
  • Off-axis-Gaussian beam intensity in random medium 
    Baykal, Yahya; Eyyuboğlu, Halil T. (Elsevier Science, 2007-01-01)
    The receiver intensity profile of an off-axis-Gaussian beam travelling in random medium is formulated. By examining the related exponential terms of this intensity expression, the rules governing the receiver plane ...
  • On the reality of the Bohmian potential 
    Umul, Yusuf Ziya (2020-12)
    The existence of the Bohmian quantum potential is investigated in terms of the energy relation of a quantum particle. The derivation process of the quantum potential is applied to the Helmholtz equation and it is shown ...
  • Paraxial propagation of a partially coherent flattened Gaussian beam through apertured ABCD optical systems 
    Cai, Yangjian; Xiang, Lü; Eyyuboğlu, Halil T.; Baykal, Yahya (Elsevier Science, 2008-06-15)
    By expanding the hard aperture function into a finite sum of complex Gaussian functions, some approximate analytical formulae for the cross-spectral density of a partially coherent flattened Gaussian beam (FGB) propagating ...
  • Partially coherent elegant Hermite-Gaussian beam in turbulent atmosphere 
    Wang, F.; Cai, Y.; Eyyuboğlu, Halil T.; Baykal, Yahya (Springer, 2011-05)
    Based on the extended Huygens-Fresnel integral, analytical formulas for the cross-spectral density, mean-squared beam width and angular spread of a partially coherent elegant Hermite-Gaussian (HG) beam in turbulent atmosphere ...
  • Partially coherent elegant Hermite-Gaussian beams 
    Wang, F.; Cai, Yangjian; Eyyuboğlu, Halil T.; Baykal, Yahya; Çil, Celal Zaim (Springer, 2010-09)
    Elegant Hermite-Gaussian beams (EHGBs) are extended to the partially coherent case. An explicit and analytical formula is derived for the cross-spectral density of a partially coherent EHGB propagating through an aligned ...
  • Partially coherent Lorentz Gaussian beam and its scintillations 
    Eyyuboğlu, Halil T. (Springer, 2011-06)
    We study the scintillation aspects of partially coherent Lorentz Gaussian (LG) beams via numerically integrating the average and average squared intensity expressions. Within the examined range of input and propagation ...