Güncel Gönderiler: Elektronik ve Haberleşme Mühendisliği Bölümü Yayın Koleksiyonu

  • 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 ...
  • Beam wander of J (0)- and I (0)-Bessel Gaussian beams propagating in turbulent atmosphere 
    Çil, Celal Zaim; Eyyuboğlu, Halil T.; Baykal, Yahya; Korotkova, Olga; Cai, Yangjian (Springer, 2010-01)
    Root mean square (rms) beam wander of J (0)-Bessel Gaussian and I (0)-Bessel Gaussian beams, normalized by the rms beam wander of the fundamental Gaussian beam, is evaluated in atmospheric turbulence. Our formulation is ...
  • Area scintillations of Bessel Gaussian and modified Bessel Gaussian beams of zeroth order 
    Eyyuboğlu, Halil T. (Springer, 2010-01)
    As an extension of our previous study, the area scintillation aspects of Bessel Gaussian and modified Bessel Gaussian beams of zeroth order are investigated. The analysis is carried out on the basis of equal source sizes ...
  • Correlation properties of random electromagnetic beams in laser resonators 
    Tong, Z.; Korotkova, Olga; Cai, Yangjian; Eyyuboğlu, Halil T.; Baykal, Yahya (Springer, 2009-12)
    With the help of the generalized Huygens-Fresnel principle and the tensor approach for electromagnetic stochastic beams we investigate the behavior of their two-point spatial correlation properties on interaction with a ...
  • Developing interaction potential for H (2H) -> Cu(111) interaction system: A numerical study 
    Vurdu, Can D.; Güvenç, Ziya B. (Elsevier Science, 2010-03)
    In this study, we have used London-Eyring-Polanyi-Sato (LEPS) functional form as an interaction potential energy function to simulate H (2H) -> Cu(1 1 1) interaction system The parameters of the LEPS function are determined ...
  • Diffraction of plane waves by a black wedge 
    Umul, Yusuf Ziya (Elsevier Science, 2010-02)
    The scattering of plane waves by a black wedge is examined. Two methods are considered for the solution of the problem. A closed-form series solution is derived by performing the technique of the separation of variables ...
  • M-2-factor of coherent and partially coherent dark hollow beams propagating in turbulent atmosphere 
    Yuan, Yangsheng; Cai, Yangjian; Qu, Jun; Eyyuboğlu, Halil T.; Baykal, Yahya; Korotkova, Olga (Optical Society of America, 2009-09-28)
    Analytical formula is derived for the M-2-factor of coherent and partially coherent dark hollow beams (DHB) in turbulent atmosphere based on the extended Huygens-Fresnel integral and the second-order moments of the Wigner ...
  • Density functional study of physical and chemical properties of nano size Boron Clusters: B-n (n=13-20) 
    Atış, Murat; Özdoğan, Cem; Güvenç, Büşra (Chinese Physical Soc, 2009-08)
    Boron is an element that has ability to build strong and highly directional bonds with boron itself. As a result, boron atoms form diverse structural motifs, ultimately can yield distinct nano structures, such as planar, ...
  • Improved equivalent source theory 
    Umul, Yusuf Ziya (Optical Society of America, 2009-08)
    The equivalent source theorem, which is an important technique in the study of radiation and scattering by apertures, is improved by using the two axioms of the modified theory of physical optics. The method is applied to ...
  • Arbitrary laser beam propagation in free space 
    Arpalı, Çağlar; Baykal, Yahya; Nakiboğlu, Cem (Elsevier Science, 2009-08-15)
    The propagation of arbitrary laser beams in free space is examined. For this purpose, starting with an incident field of arbitrary field distribution, the intensity at the receiver plane is formulated via Huygens Fresnel ...
  • Average intensity and spreading of an elegant Hermite-Gaussian beam in turbulent atmosphere 
    Yuan, Yangsheng; Cai, Yangjian; Qu, Jun; Eyyuboğlu, Halil T.; Baykal, Yahya (Optical Soc Amer, 2009-06-22)
    The propagation of an elegant Hermite-Gaussian beam (EHGB) in turbulent atmosphere is investigated. Analytical propagation formulae for the average intensity and effective beam size of an EHGB in turbulent atmosphere are ...
  • Wedge diffraction in terms of the method of physical optics 
    Umul, Yusuf Ziya (IEICE-INTS Electronics Express, 2009-01-10)
    The method of physical optics is extended for wedge diffraction. The classical integral of physical optics is taken into account for the diffraction problem of plane waves by a conducting half-plane. The integral is ...
  • Concept of area scintillation 
    Eyyuboğlu, Halil T. (Springer, 2009-08)
    Stemming from the results of our earlier investigations, the concept of area scintillation is introduced, which takes into account the intensity distribution over the receiver plane. In this context, the area scintillation ...
  • A density functional study of small Li-B and Li-B-H clusters 
    Yıldırım, Erdem Kamil; Güvenç, Büşra (Pergamon-Elsevier Science Ltd, 2009-06)
    In this work we present the results of a detailed theoretical research for the small Li(n)B(m) clusters and their hydrogen storage properties by means of density functional theory. All calculations were performed by using ...
  • Beam wander characteristics of cos and cosh-Gaussian beams 
    Çil, Celal Zaim; Eyyuboğlu, Halil T.; Baykal, Yahya; Cai, Yangjian (Springer, 2009-06)
    Within the context of a general beam formulation, beam wander characteristics of cos and cosh-Gaussian beams are derived and numerically evaluated. In our graphs, the fundamental Gaussian beam is used as a benchmark for ...
  • Scintillations of partially coherent multiple Gaussian beams in turbulence 
    Baykal, Yahya; Eyyuboğlu, Halil T.; Cai, Yangjian (Optical Soc Amer, 2009-04-01)
    For an incidence composed of partially coherent multiple Gaussian beams, Huygens-Fresnel principle-based on-axis scintillation index is formulated in a weakly turbulent homogeneous horizontal atmospheric path. Our general ...
  • Closed form series solution of the diffraction problem of plane waves by an impedance half-plane 
    Umul, Yusuf Ziya (IOP Publishing Ltd, 2009-04)
    The scattering problem of plane waves by an impedance half-plane is solved by using the method of separation of variables, and a closed form series expression, which separately reduces to the cases of soft and hard ...
  • Radiation force of coherent and partially coherent flat-topped beams on a Rayleigh particle 
    Zhao, Chengliang; Cai, Yangjian; Lu, Xuanhui; Eyyuboğlu, Halil T. (Optical Society of America, 2009-02-02)
    Propagations of coherent and partially coherent flat-topped beams through a focusing optical system are formulated. The radiation force on a Rayleigh dielectric sphere induced by focused coherent and partially coherent ...
  • Comparison of wave structure functions for intensity profiles 
    Eyyuboğlu, Halil T. (Springer, 2009-03)
    We give a list of available wave structure functions (WSFs) of a spherical wave, simultaneously providing some derivation details. The aim is to assess the impact of these WSFs on intensity profiles of various beams ...
  • Scintillation index of modified Bessel-Gaussian beams propagating in turbulent media 
    Eyyuboğlu, Halil T.; Baykal, Yahya; Sermutlu, Emre; Korotkova, Olga; Cai, Yangjian (Optical Soc Amer, 2009-02)
    The scintillation index is formulated for modified Bessel-Gaussian beams propagating in weakly turbulent media. Numerical calculations applied directly to the derived triple integral show that, for off-axis positions, the ...