Alaca Avni Çelik Meslek Yüksekokulu
https://hdl.handle.net/11491/14
Alaca Avni Çelik Meslek Yüksekokuluna ait koleksiyonlar bu alt bölümde listelenir.2024-03-29T08:49:38ZStatic properties of spin-crossover with magnetic interaction of Spin-1 Blume-Emery-Griffiths model for two-sublattices
https://hdl.handle.net/11491/8740
Static properties of spin-crossover with magnetic interaction of Spin-1 Blume-Emery-Griffiths model for two-sublattices
Veliu, Valon; Özüm, Songül; Yalçın, Orhan; Erdem, Rıza
The static properties of the spin-1 Blume-Emery-Griffiths (BEG) model for two-sublattices with the presence of an external magnetic field for spin-crossover (SCO) and magnetic ordering are presented. To study the static properties of SCO and magnetic ordering we use the cluster variation method in the lowest approximation (CVMLA). The obtained self-consistent equations are solved using the Newton Raphson method. From these solutions of the self-consistent equations, we present the thermal behaviors of the high-spin fraction (nHS = QA+QB 2 ) state and magnetizations (MF = MA+MB 2 ) for different values of magnetic interaction and quadrupolar interaction parameters. Also, the properties of SCO and magnetic ordering for varying external magnetic fields are presented. It is shown some properties that magnetization is zero and SCO exhibits a first-order phase transition when the temperature increases for different value of magnetic interaction and when temperature decreases both magnetization and SCO are exhibiting the first-order phase transition with the absence of the external magnetic. SCO is different when the temperature is decreasing. However, different states appear for magnetization and SCO with varying external magnetic field for fixed temperature. Our results were compared with other theoretical investigations also given.
2022-01-01T00:00:00ZFactors affecting food waste awareness in Turkey. The case of Corum province
https://hdl.handle.net/11491/8436
Factors affecting food waste awareness in Turkey. The case of Corum province
Karakaş, Güngör
Every year in the world, a significant amount of food is wasted at the consumption stage. Since food waste awareness is the determinant of food waste behaviours, the aim of this paper is to determine the effect of materialist values, personality, religious norm, food choice, food expenditure, recycling and environmental awareness on food waste awareness. Survey data were obtained from consumers in urban areas of Çorum in March, April and May 2019. Structural Equation Model was conducted to determine the factors affecting food waste awareness of consumers. According to the results of the path analysis, religious norms were influenced only by personality, while environmental awareness was influenced by food expenditure and recycling. Although recycling was positively affected by environmental awareness, food expenditure and food choice, it was negatively affected by materialist values. The most important way to reduce food waste is to raise environmental awareness. Consumers should be informed about the impact of recycling, food expenditures, materialistic values and food choice on the environment in order to increase environmental awareness of consumers.
2022-01-01T00:00:00ZStatic and dynamic properties of two-sublattice spin-crossover systems
https://hdl.handle.net/11491/8350
Static and dynamic properties of two-sublattice spin-crossover systems
Yalçın, Orhan; Veliu, Valon; Özüm, Songül; Erdem, Rıza
We investigate the static and dynamic properties of spin-crossover systems in the presence of an external magnetic field using two-sublattice Ising-like Hamiltonian. At low temperatures both sublattices are in the LS state, and in the HS state at high temperatures. The new feature of spin-crossover is depicted for our model when we take the non-equivalent sublattices , the two-step spin-crossover phase transition is obtained with the presence of the hysteresis loop. In order to study the properties of two-step spin-crossover, we use the lowest approximation of the cluster variation method for static properties. The dynamic properties of the system with bilinear interactions are studied by the path probability method. We present high-spin state fraction vs temperature and magnetic field variations for constant values of the degeneracy ratio between high-spin and low-spin states. In the present model, we obtained the relaxation curves of the order parameters and using different temperature values. Finally, the flow diagram of the order parameters is depicted for different values of rate constant and temperature, which displays the stable, metastable, and unstable properties. Static and dynamic self-consistent equations of the system were performed by using Newton-Raphson and Runge-Kutta methods.
2022-01-01T00:00:00ZWidom lines related with the relaxational dynamics for the Ising model
https://hdl.handle.net/11491/8338
Widom lines related with the relaxational dynamics for the Ising model
Özüm, Songül
We have presented a phenomenological description for the relaxation dynamics (RD) of Ising ferromagnets in the presence of external magnetic field (h). We calculate two characteristic times using the rate constants which satify the Onsager reciprocity theorem. The temperature and magnetic field variations of these times were produced. We have shown that the extrema of the curves observed when h = 0 determine the loci of correlation length maxima or the Widom lines. Results are compared to those of response functions and thermodynamic curvature and a good agreement is achieved.
2021-01-01T00:00:00Z