Zainab Gholami

The spin-dependent Seebeck effect (SDSE) and thermal spin-filtering effect (SFE) are now considered as the essential aspects of the spin caloritronics, which can efficiently explore the relationships between the spin and heat transport in the materials. However, there is still a challenge to get a thermally-induced spin current with no thermal electron current. This paper aims to numerically investigate the spin-dependent transport properties in hybrid graphene/silicene nanoribbons (GSNRs), using the nonequilibrium Green's function method. The effects of temperature gradient between the left and right leads, the ferromagnetic exchange field, and the local external electric fields are also included. The results showed that the spin-up and spin-down currents are produced and flow in opposite directions with almost equal magnitudes. This evidently shows that the carrier transport is dominated by the thermal spin current, whereas the thermal electron current is almost disappeared. A pure thermal spin current with the finite threshold temperatures can be obtained by modulating the temperature, and a negative differential thermoelectric resistance is obtained for the thermal electron current. A nearly zero charge thermopower is also obtained, which further demonstrates the emergence of the SDSE. The response of the hybrid system is then varied by changing the magnitudes of the ferromagnetic exchange field and local external electric fields. Thus, a nearly perfect SFE can be observed at room temperature, whereas the spin polarization efficiency is reached up to 99%. It is believed that the results obtained from this study can be useful to well understand the inspiring thermospin phenomena, and to enhance the spin caloritronics material with lower energy consumption.

This paper aims to investigate the spin dependent transport properties in hybrid nanoribbons, using the non equilibrium Greens function method. The effects of temperature gradient between the left and right leads, the ferromagnetic exchange field, and the local external electric fields are also included. The results show that the spin up and spin down currents are produced and flow in opposite directions with almost equal magnitudes. This evidently shows that the carrier transport is dominated by the thermal spin current. Whereas the thermal electron current is almost disappeared.

Introduction: The Covid-19 pandemic has confronted nations with various challenges, including health challenges. Therefore, the present study conducted with the aim of investigating the knowledge, attitude and performance of the people of Lorestan province regarding the follow of personal and environmental hygiene to prevent of Covid-19. Methods: In this cross-sectional study, 337 people of Lorestan province conducted by random sampling method in 2022. The data collection tool was the knowledge, attitude and performance questionnaire designed by the researchers that validity and reliability confirmed. Data analyzed using SPSS19 software and T-Test, ANOVA and Pearson tests. Results: 59.9 of female participants with an average age of 29.20±8.16 years and the average age of males was 32.75±8.81years. The average knowledge, attitude and performance score was1.54±.29, 3.16±.47 and 4.19±.96 prospectively. Pearson's test showed that there was statistically significant relationship between knowledge, attitude and performance. Conclusion: According to the findings of the research, the scores of knowledge, attitude and performance were above the average, therefore, in order to prevent and control the disease of Covid-19, more training is needed to improve knowledge and attitude continuously.