Browsing by Author "Tarı, Özlem"
Now showing items 1-20 of 33
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3D EM data driven surrogate based design optimization of traveling wave antennas for beam scanning in X-band: an application example
Belen, Aysu; Gunes, Filiz; Palandoken, Merih; Tarı, Özlem; Belen, Mehmet A.; Mahouti, Peyman (WINEF, 2022)In this paper, design and optimization of a microstrip elliptic traveling wave antenna (TWA) are presented for the beam scanning in X-band as an application of 3D data driven surrogate based design optimization technique. ... -
Analysis of the thermal expansivity near the tricritical point in dilute chromium alloys
Yurtseven, Hamit; Tarı, Özlem (American Institute of Physics, 2016)Chromium (Cr) undergoes a first order Neel transition as an antiferromagnetic material. When V, Mo and Mn atoms are substituted in the Cr lattice, a weak first order Neel transition in pure Cr changes toward a second order ... -
Analysis of vibrational spectra in relation to the thermodynamic quantities close to the phase transitions in ammonium halides (NH4F and NH4I)
Tarı, Özlem; Yurtseven, Hamit (Elsevier, 2017)The pressure dependences of the vibrational frequencies of the TO and L modes are analyzed from the literature data and the thermodynamic quantities such as isothermal compressibility K gamma, thermal expansion alpha p and ... -
Calculation of Magnetization and Magnetic Susceptibility Close to Magnetic Phase Transitions in (CH3)(2)(NH2FeNiII)-Ni-III(HCOO)(6) and (CH3)(2)(NH2FeCuII)-Cu-III(HCOO)(6)
Yurtseven, H.; Tarı, Özlem (Springer/Plenum Publishers, 2020)We study the temperature and magnetic field dependence of the magnetization (M) and the inverse susceptibility (chi(-1)) in the metal-organic frameworks, in particular, for (CH3)(2)(NH2FeNiII)-Ni-III(HCOO)(6) (DMFeNi) and ... -
Calculation of the C-P-C-V as a function of temperature close to the melting point in benzene
Tarı, Özlem; Yurtseven, Hamit (Taylor & Francis, 2018)The temperature dependence of the C-P - C-V is calculated at constant pressures using the observed volume data from the literature for solid and liquid benzene near the melting point. Our calculated values are compared ... -
Calculation of the Liquid-Solid Phase Diagram and the Thermodynamic Quantities of the Binary System of Tetradecane and Hexadecane Using the Mean Field Theory
Yurtseven, H.; Emirosmanoğlu, T.; Tarı, Özlem (Springer/Plenum Publishers, 2021)The T - x phase diagram of a binary system of tetradecane + hexadecane is calculated using the Landau phenomenological model. Expressions derived for the phase lines are fitted to experimental data from the literature and ... -
Calculation of the Raman frequencies as a function of pressure in the solid phases II and III (III’) of benzene
Yurtseven, Hamit; Tarı, Özlem (Springer, 2013)We calculate here the Raman frequencies of the lattice modes A(Ag), B(B2g) and C(B1gB3g) as a function of pressure at room temperature for the solid phases (II, III and III’) of benzene. This calculation is performed using ... -
Calculation of the Raman frequencies as a function of temperature in phase I of benzene
Tarı, Özlem; Yurtseven, Hamit (Journal of Indian Chemical Society, 2013)This study gives our calculation of the Raman frequencies of the lattice modes A (A1g), B (AgB2g) and C (B1gB3g) as a function of temperature at constant pressures of 0, 1.4 and 3.05 GPa for the solid phase I of benzene. ... -
Calculation of the Raman frequency shifts for the ? phase of solid oxygen
Yurtseven, Hamit; Tarı, Özlem (Elsevier, 2017)We calculate in this study the Raman frequencies of the two librons and one vibron at various pressures at constant temperatures of 10 K and also at the temperatures of 6 and 18 K by using the volume data from the literature ... -
Calculation of the soft-mode frequency for the alpha – beta transition in quartz
Yurtseven, Hamit; Tarı, Özlem (Elsevier, 2016)The ? – ß structural transition occurs in quartz at TC = 846 K. The frequency of the soft mode associated with the volume increase, decreases with increasing temperature as the transition temperature is approached. In this ... -
Calculation of the spontaneous polarization for Pb1-xCaxTiO3 close to the tricritical point
Tarı, Özlem; Yurtseven, Hamit (Taylor & Francis, 2016)We calculate the spontaneous polarization as a function of temperature for a mixed crystal of Pb1-xCaxTiO3 close to the tricritical pointdx (x = 0.4). This calculation of the spontaneous polarization is performed using the ... -
Calculation of the T – X phase diagram of tetradecane + hexadecane and tetradecane + pentadecane under high pressure by the landau mean field theory
Tarı, Özlem (Elsevier, 2022)Landau phenomenological model is applied to two binary mixtures (tetradecane + hexadecane and tetradecane + pentadecane) to calculate T−x (temperature - composition) phase diagram under high pressure for their solid – ... -
Calculation of the thermodynamic quantities from the Raman frequency shifts and the Pippard relations for the alpha, -alpha and alpha ' phases of oxygen
Tarı, Özlem; Yurtseven, Hamit (Elsevier, 2018)Thermodynamic quantities such as the isothermal compressibility, thermal expansion and the difference in the specific heat are calculated as a function of pressure (T=10 K) for the alpha,-alpha and alpha ' phases of oxygen ... -
Calculation of the thermodynamic quantities of perovskite metal organics DMAKCr and perovskite HyFe close to the weakly first-order relaxor-like structural transformation using the mean field theory
Yurtseven, Hamit; Tarı, Özlem (World Scientific Pub., 2019-04-30)Weakly first-order or nearly second-order phase transitions occurring in metal{organic frameworks (MOFs), particularly in DMAKCr and perovskite HyFe, are studied under the mean field model by using the observed data from ... -
Data-Driven Surrogate-Assisted Optimization of Metamaterial-Based Filtenna Using Deep Learning
Mahouti, Peyman; Belen, Aysu; Tarı, Özlem; Belen, Mehmet Ali; Karahan, Serdal; Koziel, Slawomir (MDPI, 2023)In this work, a computationally efficient method based on data-driven surrogate models is proposed for the design optimization procedure of a Frequency Selective Surface (FSS)-based filtering antenna (Filtenna). A Filtenna ... -
Design Optimization of Ultra-Wideband Vivaldi Antenna using Artificial Intelligence
Mahouti, Peyman; Kızılay, Ahmet; Tarı, Özlem; Belen, Aysu; Belen, Mehmet A.; Çalışkan, Alper (Applied Computational Electromagnetics Society (ACES), 2022)In this work, computationally efficient design optimization of frequency selective surface (FSS)-loaded ultra-wideband Vivaldi antenna via the use of data-driven surrogate model is studied. The proposed design methodology ... -
Gain Enhancement of a Traditional Horn Antenna using 3D Printed Square-Shaped Multi-layer Dielectric Lens for X-band Applications
Belen, Aysu; Mahouti, Peyman; Gunes, Filiz; Tarı, Özlem (Applied Computational Electromagnetics Society (ACES), 2021)In this work, gain of a traditional horn antenna is enhanced up to 2.9 dB over X-band using 3D printed square-shaped multi-layer lens. For this purpose, firstly the multi-layer lenses are designed using Invasive Weed ... -
Magnetic Transitions in Two Novel Mixed-Valence Iron(Ii)–Iron(Iii) Metal Formate Frameworks : Two Sublattice Model
Yurtseven, Hasan Hamit; Tarı, Özlem (Elsevier B.V., 2022)We study the two-sublattice model in the mean field theory by expanding the Gibbs free energy in terms of the magnetizations M1 (Mup) and M2 (Mdown) with the quadratic coupling M12M22 (quadrupolar interactions) for the ... -
Modelling of swelling by the fluorescence technique in kappa carrageenan gels
Tarı, Özlem; Pekcan, Önder (American Institute of PhysicsAIP Conference Proceedings, 2011)Kappa (-) carrageenan gels prepared with various carrageenan concentrations in pure water were completely dried and then swelled in water vapor. Steady state fluorescence measurements were performed using a spectrometer ... -
Molar volume calculated at various pressures and the Pippard relations close to the melting point in benzene
Yurtseven, Hamit; Tarı, Özlem (Taylor & Francis, 2016)The molar volume of solid and liquid benzene was calculated at various pressures (at constant temperatures), and the Pippard relations were examined close to the melting point in this organic molecule. The molar volume ...
