Browsing by Author "Tarı, Özlem"
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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 the CPCV as a function of temperature close to the melting point in benzene
Tarı, Özlem; Yurtseven, Hamit (Taylor & Francis, 2018)The temperature dependence of the CP  CV 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 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 softmode 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 Pb1xCaxTiO3 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 Pb1xCaxTiO3 close to the tricritical pointdx (x = 0.4). This calculation of the spontaneous polarization is performed using the ... 
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 firstorder relaxorlike structural transformation using the mean field theory
Yurtseven, Hamit; Tarı, Özlem (World Scientific Pub., 20190430)Weakly firstorder or nearly secondorder 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 ... 
Magnetic Transitions in Two Novel MixedValence Iron(Ii)–Iron(Iii) Metal Formate Frameworks : Two Sublattice Model
Yurtseven, Hasan Hamit; Tarı, Özlem (Elsevier B.V., 2022)We study the twosublattice 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 ... 
Pippard relation close to the alpha  beta transition for quartz in granite
Yurtseven, Hamit; Tarı, Özlem; Gümüş, Ayşegül (American Institute of Physics, 2016)In this study, we examine variation of the thermal expansion ?p with the isothermal compressibility KT at various temperatures (1 atm) close to the ?ß transition in quartz using the experimental data from the literature. ... 
Pippard relations for cubic gauche nitrogen
Yurtseven, Hamit; Tiryaki, Özgecan; Tarı, Özlem (2016)The Pippard relations (CP vs. ?P and ?P vs. ?T) are examined at various temperatures up to 1200 K at zero pressure (P = 0) for the cubic gauche nitrogen. The specific heat (CP) is related to the thermal expansion (?P) and ... 
Pressure dependence of the heat capacity near the melting point in benzene
Yurtseven, Hamit; Tarı, Özlem (Elsevier Science, 2017)The heat capacity Cp is calculated as a function of pressure at constant temperatures of 25, 40 and 51 degrees C for the solid and liquid phases of benzene near the melting point. For this calculation, the observed molar ... 
Pressure effect on the cholesteric – smectic A transition in cholestryl myristate
Yurtseven, Hamit; Yolal, B.; Tarı, Özlem (Taylor & Francis, 2016)Cholesteryl myristate exhibits tricritical behavior under high pressures close to its cholestericsmectic A (Ch/SA) transition, as observed experimentally. We study here the thermodynamic properties of this liquid crystal ... 
Raman frequencies calculated at various pressures in phase I of benzene
Tarı, Özlem; Yurtseven, Hamit (KCS Publications, 2013)We calculate in this study the pressure dependence of the frequencies for the Raman modes of A (Ag), B (Ag, B2g) and C (B1g, B3g) at constant temperatures of 274 and 294K (room temperature) for the solid phase I of benzene. ... 
Surrogate Based Design Optimization of MultiBand Antenna
Tarı, Özlem; Aysu, Belen; Mahouti, Peyman; Belen, Mehmet Ali (Institute of Electrical and Electronics Engineers Inc., 2021)In this work, design optimization process of a multiband antenna via the use of Artificial Neural Network (ANN) based surrogate model and metaheuristic optimizers is studied. For this mean firstly, by using LatinHyper ... 
Temperature dependence of magnetic and thermal properties of chiral HyFe and HyMn close to phase transitions by using the Landau mean field model
Tarı, Özlem; Yurtseven, Hamit (Elsevier Science, 2019)Magnetic and thermal properties of chiral metal formate frameworks (MOFs) of NH2NH3M(HCOO)(3), M = Fe, Mn, namely, HyFe and HyMn are investigated close to phase transitions by using Landau phenomenological model. By expanding ...