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Umul, Yusuf Ziya

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Profile URL
https://hdl.handle.net/20.500.12416/9171
Name Variants
Umul, Y. Z.
Umul, Z. Yusuf
Umul, Yusuf Z.
Umul, YZ
Umul, Y.Z.
Job Title
Prof. Dr.
Email Address
Main Affiliation
06.02. Elektronik ve Haberleşme Mühendisliği
Elektronik ve Haberleşme Mühendisliği
06. Mühendislik Fakültesi
01. Çankaya Üniversitesi
Status
Former Staff
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WoS Researcher ID

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Scholarly Output

180

Articles

171

Views / Downloads

2964/872

Supervised MSc Theses

0

Supervised PhD Theses

0

WoS Citation Count

1303

Scopus Citation Count

1363

WoS h-index

17

Scopus h-index

18

Patents

0

Projects

0

WoS Citations per Publication

7.24

Scopus Citations per Publication

7.57

Open Access Source

15

Supervised Theses

0

JournalCount
Optik79
Journal of the Optical Society of America A20
Optics Communications12
Optics & Laser Technology7
Optical and Quantum Electronics7
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Now showing 1 - 10 of 180
  • Thumbnail Image
    Article
    Citation - WoS: 15
    Citation - Scopus: 15
    Effect of the Shadow Geometry on Diffraction
    (Optical Soc Amer, 2008) Umul, Yusuf Z.
    The effect of the scatterer surface on the shadow region is examined by using the surface integrals of the modified theory of physical optics. It is shown that the shadow geometry has a considerable effect on the structure of the edge diffracted waves. The diffracted fields for the illuminated and shadowed surface of a half-plane are evaluated in terms of Fresnel integrals and plotted numerically. (C) 2008 Optical Society of America
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    Article
    Citation - WoS: 15
    Citation - Scopus: 15
    Diffraction of Waves by a Resistive Half-Plane
    (Elsevier Science Bv, 2014) Umul, Yusuf Z.
    The scattered waves by a resistive half-plane are investigated with defining reflection and transmission coefficients for the diffracted waves. The coefficients are determined according to suitable conditions that are derived from the boundary conditions and the limiting cases of the reflection and transmission coefficients of the geometrical optics fields. The resultant field expressions are examined and compared with the literature numerically. (C) 2014 Elsevier By All rights reserved.
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    Article
    Citation - WoS: 12
    Citation - Scopus: 13
    Three Dimensional Modified Theory of Physical Optics
    (Elsevier Gmbh, 2016) Umul, Yusuf Ziya
    The three dimensional version of the modified theory of physical optics is introduced with the aid of a Green's function that satisfies the Helmholtz equation in local spherical coordinates. The algorithm which leads to the construction of the scattering integral is given. The method is applied to the three dimensional diffraction problem of plane waves by a perfectly conducting half-plane. The comparison of the resulting field expressions with the literature shows that the modified theory of physical optics leads to the exact solution. (C) 2015 Elsevier GmbH. All rights reserved.
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    Article
    Citation - WoS: 2
    Citation - Scopus: 2
    The Physical Optics Integral of Creeping Waves
    (Taylor & Francis Ltd, 2012) Umul, Y. Z.
    The creeping waves, occurring in surface diffraction, are expressed as a physical optics surface integral. The scattering geometry and the implications of the surface integral are investigated in the context of the diffraction theory. The method is applied to the scattering problems of plane waves by an infinite parabolic conducting reflector. The results are analyzed numerically.
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    Article
    Citation - WoS: 19
    Citation - Scopus: 19
    Scattering of a Gaussian Beam by an Impedance Half-Plane
    (Optical Soc Amer, 2007) Umul, Yusuf Z.
    The diffraction of a Gaussian beam by an impedance half-plane is studied through the method of the modified theory of physical optics. An electric line source, which is defined in the complex space, is used to represent the Gaussian beam. The uniform evaluation of the diffraction integral is performed and the scattering patterns of the field are investigated for various numerical parameters of the incident wave. (c) 2007 Optical Society of America.
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    Article
    Citation - WoS: 1
    Citation - Scopus: 1
    Kinetic Energy Based Relativistic First Order Wave Equations
    (Elsevier Gmbh, 2019) Umul, Yusuf Ziya
    A relativistic wave equation is derived for spin-1/2 particles. The energy relation is taken into account with respect to the kinetic energy term. Two first order differential equations are obtained from the kinetic energy based relativistic equations. The spin information is integrated to the new equations in two alternative forms.
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    Conference Object
    İki izorefraktif ortam arasına yerleştirilmiş empedans sınır koşuluna sahip yarım düzlemden düzlemsel dalgaların saçılması
    (2016) Başdemir, Hüsnü Deniz; Umul, Yusuf Ziya
    İki izorefraktif ortamın sınırına yerleştirilmiş empedans sınır koşuluna sahip bir yarım düzlemden düzlemsel dalgaların saçılması incelenir. Elde edilen alan ifadeleri sayısal olarak analiz edilir.
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    Article
    Citation - WoS: 2
    Citation - Scopus: 2
    Diffraction of Electromagnetic Waves by a Resistive Half-Plane in Magneto-Ionic Plasma
    (Wiley-v C H verlag Gmbh, 2020) Umul, Yusuf Ziya
    The interaction of magnetic polarized electromagnetic wave with a resistive half-plane in magneto-ionic plasma is investigated. The method of transition boundary is used for the evaluation of the diffracted wave. The excitation of surface waves is examined in the medium and their diffracted fields are derived by using the diffraction theory for grazing incidence. The uniform field expressions are obtained with the aid of the uniform theory for evanescent waves. The behaviours of the derived scattered waves are studied numerically.
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    Article
    Diffraction Theory of Waves by Resistive Surfaces
    (2010) Umul, Yusuf Ziya; Yalçın, Uğur
    Diffraction of scalar plane waves by resistive surfaces are investigated by defining a new boundary condition in terms of the Dirichlet and Neumann conditions. The scattering problems of waves by a resistive half-plane and the interface between resistive and perfectly magnetic conducting half-planes are examined with the developed method. The resulting fields are plotted numerically. The numerical results show that the evaluated field expressions are in harmony with the theory.
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    Book Review
    Citation - WoS: 4
    Citation - Scopus: 5
    The Theory of the Boundary Diffraction Wave
    (Elsevier Academic Press inc, 2011) Umul, Yusuf Ziya