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Erken Ozge 한국물리학회 2022 Current Applied Physics Vol.34 No.-
Fe2O3 thin films were deposited by Successive Ionic Layer Adsorption and Reaction (SILAR) method onto glass substrates at different cycle numbers to investigate structural, linear and nonlinear optical properties. X-Ray Diffraction (XRD) analysis revealed that the Fe2O3 thin films have a non-crystalline nature. The morphological properties of the films were investigated by Field Emission-Scanning Electron Microscopy (FE-SEM) and the results show that the films’ surfaces are porous. The linear and nonlinear optical parameters were evaluated and analyzed by using transmittance and absorbance measurements. For these measurements, UV–Vis spectroscopy at room temperature was used. The refractive index values were calculated in the range of 1.45–3.23 for visible region (400–700 nm). Obtained results reveal that direct optical band gap changed between 2.62 and 2.68 eV and indirect optical band gap changed between 1.67 and 1.77 eV. Additionally, optical electronegativity, optical dielectric constants, surface and volume energy loss functions, nonlinear refractive index, linear optical susceptibility, third-order nonlinear optical susceptibility, optical and electrical conductivity, and loss tangent values were calculated and discussed in detail. It was found that each parameter studied is dependent on the cycle numbers. Also, it can be stated that Fe2O3 thin films are promising candidate for solar cells and optoelectronic device technology.
SOME CLASSES OF 3-DIMENSIONAL NORMAL ALMOST PARACONTACT METRIC MANIFOLDS
ERKEN, I. KUPELI The Honam Mathematical Society 2015 호남수학학술지 Vol.37 No.4
The aim of present paper is to investigate 3-dimensional ${\xi}$-projectively flt and $\tilde{\varphi}$-projectively flt normal almost paracontact metric manifolds. As a first step, we proved that if the 3-dimensional normal almost paracontact metric manifold is ${\xi}$-projectively flt then ${\Delta}{\beta}=0$. If additionally ${\beta}$ is constant then the manifold is ${\beta}$-para-Sasakian. Later, we proved that a 3-dimensional normal almost paracontact metric manifold is $\tilde{\varphi}$-projectively flt if and only if it is an Einstein manifold for ${\alpha},{\beta}=const$. Finally, we constructed an example to illustrate the results obtained in previous sections.
CLASSIFICATION OF THREE-DIMENSIONAL CONFORMALLY FLAT QUASI-PARA-SASAKIAN MANIFOLDS
Erken, Irem Kupeli The Honam Mathematical Society 2019 호남수학학술지 Vol.41 No.3
The aim of this paper is to study three-dimensional conformally flat quasi-para-Sasakian manifolds. First, the necessary and sufficient conditions are provided for three-dimensional quasipara-Sasakian manifolds to be conformally flat. Next, a characterization of three-dimensional conformally flat quasi-para-Sasakian manifold is given. Finally, a method for constructing examples of three-dimensional conformally flat quasi-para-Sasakian manifolds is presented.
ON SLANT RIEMANNIAN SUBMERSIONS FOR COSYMPLECTIC MANIFOLDS
Erken, Irem Kupeli,Murathan, Cengizhan Korean Mathematical Society 2014 대한수학회보 Vol.51 No.6
In this paper, we introduce slant Riemannian submersions from cosymplectic manifolds onto Riemannian manifolds. We obtain some results on slant Riemannian submersions of a cosymplectic manifold. We also give examples and inequalities between the scalar curvature and squared mean curvature of fibres of such slant submersions in the cases where the characteristic vector field is vertical or horizontal.
On slant Riemannian submersions for cosymplectic manifolds
Irem Kupeli Erken,Cengizhan Murathan 대한수학회 2014 대한수학회보 Vol.51 No.6
In this paper, we introduce slant Riemannian submersions from cosymplectic manifolds onto Riemannian manifolds. We obtain some results on slant Riemannian submersions of a cosymplectic manifold. We also give examples and inequalities between the scalar curvature and squared mean curvature of fibres of such slant submersions in the cases where the characteristic vector field is vertical or horizontal.
Classification of three-dimensional conformally flat quasi-para-sasakian manifolds
Irem Kupeli Erken 호남수학회 2019 호남수학학술지 Vol.41 No.3
The aim of this paper is to study three-dimensional conformally flat quasi-para-Sasakian manifolds. First, the necessary and sufficient conditions are provided for three-dimensional quasi-para-Sasakian manifolds to be conformally flat. Next, a characterization of three-dimensional conformally flat quasi-para-Sasakian manifold is given. Finally, a method for constructing examples of three-dimensional conformally flat quasi-para-Sasakian manifolds is presented.
SOME CLASSES OF $3$-DIMENSIONAL NORMAL ALMOST PARACONTACT METRIC MANIFOLDS
I. KÄupeli Erken 호남수학회 2015 호남수학학술지 Vol.37 No.4
The aim of present paper is to investigate $3$-dimensional $\xi $% -projectively flat and $\tilde{\varphi}$-projectively flat normal almost paracontact metric manifolds. As a first step, we proved that if the $3$% -dimensional normal almost paracontact metric manifold is $\xi $% -p\-ro\-jec\-ti\-vely flat then $\Delta \beta =0$. If additionally $\beta $ is constant then the manifold is $\beta $-para-Sasakian. Later, we proved that a $3$-dimensional normal almost paracontact metric manifold is $\tilde{% \varphi}$-projectively flat if and only if it is an Einstein manifold for $% \alpha ,\beta =$const. Finally, we constructed an example to illustrate the results obtained in previous sections.
Kayihan Karaman,Arif Arisoy,Aysegul Altunkas,Ertugrul Erken,Ahmet Demirtas,Mustafa Ozturk,Metin Karayakali,Safak Sahin,Atac Celik 대한심장학회 2017 Korean Circulation Journal Vol.47 No.4
Erzurum Territorial Training and Research Hospital