فهرست مطالب zohreh kord

This research was conducted with the aim of investigating the relationship between self-regulation and the academic performance of students with the mediating role of engagment and academic bouyancy. The research was of the descriptive-correlating type. The samples included 322 students (163 girls, 159 boys) randomly selected from among all the students of Shahid Chamran University of Ahvaz who were studying in the academic year of 2022-2023. Data were collected through the academic self-regulation questionnaire of Bouffard et al. (1995), the academic engagment questionnaire of Ryu and Tseng (2011), the academic bouyancy questionnaire of Martin and Marsh (2008) and the academic performance collected data were analyzed using the structural equation modeling method and SPSS and AMOS softwares. Results showed that the proposed model had a good fit with data. Findings indicated that the direct effect of academic self-regulation on academic performance, academic engagment and academic bouyancy is a positive and significant relationship. In addition, the direct effect of academic engagment with academic performance and academic bouyancy with academic performance was also positive and significant. Also, the results of indirect paths showed that academic self-regulation has a positive effect on academic performance through academic engagment and academic bouyancy. Accordingly, when a person incorporates himself/herself in the learning process, he/she can learn better and deeper. In addition, a person with high academic talent will maintain his/her self-confidence in the face of academic challenges and obstacles and will try to overcome the challenges well and achieve success. Therefore, the educational institutions, universities and educational instructors are advised to use this model for improving students' academic performance.

The present study was performed to identify diversity indices of herb layer functional groups and its relation to physiographical factors in central Zagros forest, Lorestan. For this purpose, sampling of herbaceous plants was conducted randomly in plots of 2×2 m (n=50) in site. All plants were classified to functional groups including forbs, graminoids and legumes, also Raunkiaerchr('39')s life-forms. Diversity values (Richness, Shanon-weawerchr('39')s diversity and Hillchr('39')s evenness indices) were measured in each plot. Totally, 103 plant species were identified which belong to 27 families and 82 genera. Results indicated that aspect influenced the forbs as well diversity indices of graminoids and legumes, but slope and altitude had no effect on diversity indices. In research site, aspect had important impact on plant distribution and diversity of plant functional groups. Generally, it can be stated that ecological and managemental factors including landuse changes and grazing intensity in Zagros region influenced the plant species composition.