https://hdl.handle.net/20.500.12294/439 Elektrik-Elektronik Mühendisliği Bölümüne ait koleksiyonlar bu alt bölümde listelenir. 2026-04-14T01:40:28Z https://hdl.handle.net/20.500.12294/4088 Pressure Effect on Thermodynamic Quantities for the Solid-Liquid Phase Transition in n-tridecane, n-hexadecane and n-octadecane Tari, O.; Yurtseven, H. The pressure effect is investigated regarding the solid - liquid equilibria (SLE) in n-alkanes. Using the Landau phenomenological model, the pressure dependences of the thermodynamic functions are predicted and the phase diagrams are constructed for the solid - liquid transitions in the binary mixtures of n-alkanes. The experimental data from the literature are used for the phase diagrams in the mixtures. Our fits for the phase diagrams are reasonably good. Regarding the cubic dependence of the concentration (T-X, P-X) and the linear dependence of the pressure (P-T) on the temperature, our results show that the n-tridecane is distinguished from the other mixtures due to its lowest freezing temperature (T1=291.08 K) and correspondingly higher concentration (x1=0.1982). It is found that the divergence behaviour of the heat capacity (C) with the critical exponent 1/2 from the extended mean field model is in particular more apparent at the room temperature (293.15 K) at various pressures for the solid - liquid transition. This is accompanied with the pressure dependences of the order parameter, susceptibility, entropy and enthalpy for those mixtures as studied here. © 2024 International Journal of Thermodynamics. All rights reserved. 2024-01-01T00:00:00Z https://hdl.handle.net/20.500.12294/4062 Calculation of phase diagram and the thermodynamic quantities by the Landau mean field model close to the solid - liquid and solid - solid transitions in n-paraffins Yurtseven, Hamit; Tari, Ozlem We calculate the phase diagrams and predict the temperature dependence of the thermodynamic quantities at high pressures for the solid - liquid and solid - solid transitions in n-paraffins. This calculation is performed by fitting the phase line equations as obtainedfrom the Landau model to the experimental data from the literature. On thebasis of the Landau model, phase diagram of the solid - solid transition ispredicted at 0.1 MPa for the binary mixtures of n-tridecane + (n-hexane and cyclohexane).For the calculation of the heat capacity the extended mean field is employedfor the n-paraffins studied here. We find that our calculated phase diagrams explain the observed behaviour of the liquid - solid transitions at high pressures in those binary mixtures. Our phase diagrams predicted at 0.1 MPa and our predictions for the thermodynamic quantities can be compared with the experiments for those binary mixtures. 2024-01-01T00:00:00Z https://hdl.handle.net/20.500.12294/4050 Amplitude analysis and branching fraction measurement of the decay Ds+ → π + π 0 π 0 Kolcu, Onur Buğra; BESIII Collaboration Using a data set corresponding to an integrated luminosity of 6.32 fb−1 recorded by the BESIII detector at center-of-mass energies between 4.178 and 4.226 GeV, an amplitude analysis of the decay Ds+ → π+π0π0 is performed, and the relative fractions and phases of different intermediate processes are determined. The absolute branching fraction of the decay Ds+ → π+π0π0 is measured to be (0.50 ± 0.04stat ± 0.02syst)%. The absolute branching fraction of the intermediate process Ds+ → f0(980)π+, f0(980) → π0π0 is determined to be (0.28 ± 0.04stat ± 0.04syst)%. [Figure not available: see fulltext.] © 2022, The Author(s). 2022-01-01T00:00:00Z https://hdl.handle.net/20.500.12294/4049 Amplitude analysis and branching fraction measurement of the decay Ds+ → K + π + π − Kolcu, Onur Buğra; BESIII Collaboration Using 6.32 fb−1 of e+e− collision data collected at the center-of-mass energies between 4.178 and 4.226 GeV with the BESIII detector, we perform an amplitude analysis of the decay Ds+→ K+π+π− and determine the amplitudes of the various intermediate states. The absolute branching fraction of Ds+→ K+π+π− is measured to be (6.11 ± 0.18stat.± 0.11syst.) × 10−3. The branching fractions of the dominant intermediate processes Ds+→ K+ρ0, ρ0→ π+π− and Ds+→ K*(892)0π+, K*(892)0→ K+π− are determined to be (1.96 ± 0.19stat.± 0.23syst.) × 10−3 and (1.85 ± 0.12stat.± 0.13syst.) × 10−3, respectively. The intermediate resonances f0(500), f0(980), and f0(1370) are observed for the first time in this channel. [Figure not available: see fulltext.] © 2022, The Author(s). 2022-01-01T00:00:00Z