درخت حوزه‌های تخصصی

The present study was conducted to investigate the mediating role of achievement anxiety in the relationship between perfectionism and cognitive flexibility in math learning in students. The study was correlational using structural equation modeling. The statistical population included senior high school female students in the academic year of 2022-2023. According to the obvious variables, allocation of 25 coefficients, and taking into account the incomplete questionnaires, 231 students were selected by convenience sampling. The instruments included Hewitt and Flett’s perfectionism (1991) questionnaire, Dennis and Vander Wal's cognitive flexibility (2010) questionnaire, and Alpert and Haber's achievement anxiety (1960) questionnaire. Also, the students’ math scores at the end of the semester were used to measure their math learning. The data were analyzed by Pearson's correlation coefficient test and structural equation modeling using SPSS18 and AMOS24 software. The results showed that perfectionism and achievement anxiety have a negative direct effect, and cognitive flexibility has a positive direct effect on math learning. Also, perfectionism and cognitive flexibility have an indirect effect on math learning through achievement anxiety. The research model was also confirmed and the result showed that the variable measurement models have a good fit and 41% of the math learning variance is explained by the research variables. The findings of this research can be beneficial for teaching and learning of students. With educational planning and helping students, their cognitive capacities and competencies can be increased and their mathematical learning can be effectively improved.

 Objective: Irritable bowel syndrome is a chronic psychosomatic disease. Stressful events play a critical role in this disease, and lifestyle modification is one of the treatment priorities for these patients. The present study aimed to examine the role of health-enhancing lifestyles among stressful life events and salutogenic health indicators in these patients. Method: Data analysis was done by structural equation modeling. The statistical population included all patients with irritable bowel syndrome referred to Imam Sajjad Hospital in Tehran in 2019 and 2020. The statistical sample was 229 patients selected through Purposive sampling and diagnosed by a psychiatrist based on ROME-IV criteria. Research tools included the Bringsen Salutogenic Health Indicators Scale, Sarason Life Events Inventory, and Walker HealthPromoting Lifestyle Profile-II. Data analysis was done by SPSS-20 and LISREL-8 software. Ethical considerations based on confidentiality, respect for the rights of individuals, human dignity, and avoiding harming the participants and distorting information were observed. Also Participants had full authority to withdraw from the study at any time. Results: The relationship between lifestyle (t=2.723, ß=0.17) and stressful events (t=-2.31, ß=-0.42) with salutogenic health indicators was significant. The mediating role of lifestyle between life events and salutogenic health indicators was meaningful at P<005 and a standard coefficient (0.0-13.11). Conclusion: It seems that lifestyle and control over stressful events affect the health indicators of patients with irritable bowel syndrome. Therefore, it is suggested to provide appropriate training programs to control and manage stressful events and provide strategies to modify lifestyle to improve health. 

The concept of social presence is defined as the ability of learners to identify the learning community, have a sense of belonging to the community and communicate purposefully in a learning community. The reason for emphasizing the social presence of online learning is that online and virtual learning experts believe that social constructivism is an important factor in promoting interpersonal communication and the quality of learning. Given the importance of social presence as an influential variable in the process of virtual education, it is necessary to pay more attention to this issue and its predictors. In this regard, the present study aimed to provide a causal model for predicting social presence based on cognitive presence mediated by the online learning atmosphere. Participants included 265 students of online courses of Payame Noor universities in North Khorasan province in the academic year of 2009-2010 who were selected by cluster random sampling method. In order to measure the research variables, questionnaires of cognitive presence, social presence and online learning atmosphere were used. Amos software and path analysis method were used to evaluate the proposed model. The results showed that, 1-According to the above findings, the proposed model in the RMSEA index (root mean square of estimation errors) does not fit well, so the model was modified by correlating latent variable errors and The results showed that the final model has a good fit; 2-Cognitive presence has a direct, positive and significant relationship with social presence (P≤0.05 and β=0.62); There is a direct, positive and significant relationship between cognitive presence and online learning (P≤0.05 and β= 0.14) and also a direct relationship between online learning atmosphere and social presence is positive and significant (P≤0.05 and β=0.32); 3-In the indirect way, with the presence of mediator variables, the relationship between cognitive presence and social presence was still significant and the online learning atmosphere absorbs part of the effect of cognitive presence on social presence and mediates this relationship in part .