مطالب

Purpose: Individuals going through adolescence faced a significant number of changes from biological, and cognitive to social and emotional. Due to the changes experienced by adolescents, it is susceptible for adolescents to experience a high level of loneliness. The correlation between loneliness and impulsivity and the association between impulsivity and self-harm as well as self-injurious behaviors puts adolescents in a vulnerable position in performing undesirable acts or behaviors. On the other hand, resilience plays a significant role in an individual’s ability to cope with an adverse situation or bounce back quickly after the undesired situation in order to maintain or regain mental health. Therefore, the objective of this study is to run review research through contemporary studies to summarize accumulative documents in the area of resilience, loneliness, and impulsivity among adolescents to investigate the mediating role of resilience. Methodology: For this, a search was carried out on the Web of Science, Google Scholar, and PubMed. Thus, a set of keywords was used, followed by filtering main keywords, resulting in a review of 99 articles published a decade ago. Findings: The results demonstrated that the number of adolescents having mental illness increased significantly over the years, and adolescents aged 16 and above are at risk of mental disorders. Besides that, this research revealed that adolescents in Malaysia are at risk of peer and social rejection, which is highly associated with loneliness and also has a correlation with aggression and impulsivity. Conclusion: It was seen that loneliness and impulsivity are essential risk factors for adolescents’ mental health and resilience can consider effective cognitive and coping skills for adolescents. It was also perceived that most of the papers focus on the investigation of the correlation between loneliness, impulsivity, and resilience, being necessary to develop more experimental studies on the effectiveness of resilience therapy for adolescents’ enrichment. These results serve as a source of reference for future research.

Purpose: The using an interactive approach in sciences education can improve its learning. Therefore, the current research was conducted with the aim of identifying the dimensions and components of sciences education based on an interactive approach with an emphasis on the nature of science. Methodology: This study in terms of purpose was applied and in terms of implementation method was qualitative. The current research population was university students and teachers of basic sciences who were familiar with the subject, which number of 15 people of them were selected as a sample according to the principle of theoretical saturation and with the purposive sampling method. The data was collected by the in-depth semi-structured interview method and its validity was confirmed by the triangulation method and its reliability was obtained by the agreement coefficient method between two coders 0.86. The data were analyzed by open, axial and selective coding method in MAXQDA software. Findings: The findings showed that for sciences education based on an interactive approach with an emphasis on the nature of science were identified 48 concepts in 16 categories and 4 themes; So that 4 themes were included quality-orientation in the sciences education system (with 3 categories of quality evaluation in the educational system of formal education, efficiency of the educational system for science education and lack of effectiveness of science education programs in the formal education system), strategic management of the education system of formal education (with 6 categories of trust to abilities and plans of policymakers, institutionalizing the principles of science education, intra-group and institutional collectivism, developing the structure of an educational implementation system for logical thinking, keeping pace with global developments and designing science education programs for students), proposed solutions for designing the science education system based on the interactive approach (with 3 categories of students' participation in education, emphasis on strengthening the spirit of independence of students and logical education and its place in modern education) and challenges of the formal education system in the field of sciences education (with 4 categories of identity and its place of science in the educational system, argument-oriented and having a critical view, macro structure and institutional level of formal education and criticism to the educational system of current education structure in schools. Conclusion: Based on the results of the current research and the identified dimensions and components for sciences education based on an interactive approach with an emphasis on the nature of science, experts and planners of the educational system can take an effective step towards improving the sciences education based on an interactive approach by improving its dimensions and components.

Purpose: Entrepreneurial leadership plays an effective role in improving the performance of various businesses including small and medium businesses. As a result, the current research was conducted with the aim of presenting a model of the role of entrepreneurial leadership in the performance of active small and medium businesses in the field of nanotechnology in Tehran. Methodology: The method of this research was of mixed exploratory type (qualitative and quantitative). The population of the present study in the qualitative section was the policy experts of the nanotechnology industry, which number of 17 of them were selected as a sample according to the principle of theoretical saturation and with the purposeful sampling method. Also, the population of present study in the quantitative section was the managers and experts of small and medium businesses of nanotechnology industry whit number 1434 people, which 303 people of them were selected as a sample according to Cochran's formula and with the available sampling method. The data of the qualitative and quantitative sections were collected with methods of semi-structured interview and researcher-made questionnaires, respectively which whose psychometric indicators were confirmed and analyzed with methods of thematic analysis in MAXQDA software and exploratory factor analysis and structural equation modeling in SPSS and LISREL software, respectively. Findings: The findings of the first part of current research showed that the model of the role of entrepreneurial leadership in the performance of active small and medium businesses in the field of nanotechnology had 13 sub-factors in the 5 main factors of guidance, support, coaching, facilitation and entrepreneurship. Also, the findings of the second part of the present study showed that the factor load, average variance extracted and reliability of all factors were appropriate. In addition, the model of the role of entrepreneurial leadership in the performance of small and medium-sized businesses active in the field of nanotechnology had a significant effect on all five main factors and each factor with its sub-factors (P<0.05). Also, the findings of the second part of the current research showed that the factor load, average variance extracted and reliability of all factors were appropriate. In addition, the model of the role of entrepreneurial leadership in the performance of active small and medium businesses in the field of nanotechnology had a significant effect on all five main factors and each main factor on its sub-factors (P<0.05). Conclusion: The model of the role of entrepreneurial leadership in the performance of active small and medium businesses in the field of nanotechnology has many practical implications for the activists in the field of nanotechnology industry, and they can according to the identified factors provide the basis for improving entrepreneurial leadership.

This study examined the extent to which stock returns can be explained by fundamental financial information. To this end, the accuracy of predicting future stock returns under conditions of mispricing stocks, including underpriced and overpriced stocks, was evaluated. The empirical results are based on a sample of 140 companies listed on the Tehran Stock Exchange during 2006-2022. The applied methodology is based on multivariate regression analysis of panel data. In particular, the six-factor models of Fama-French (2018), Nichols-Wallen-Wyland (2017), and Rhodes croft-Robinson-Viswanathan (2005) have been calculated to investigate the extent of explaining future stock valuation and returns. The results show that most of the changes in the stock valuation of the investigated companies are explained by using fundamental financial factors. Specifically, the results indicate that undervalued companies have earned higher stock returns in the coming year compared to overvalued companies. In other words, in undervalued companies, the stock return has increased in the following year, and in overvalued companies, the future stock return has decreased. According to the provided results, investors and stock exchange regulatory bodies are advised to more sensitively examine companies that have a lower rating of incorrect stock valuation based on the models introduced in this research.

Background: Exposure to high altitude causes significant stress in the functioning of cardiovascular and respiratory systems.Aim: The aim of this study was to investigate the changes in systolic and diastolic blood pressure (BP), heart rate (HR) and pulmonary volumes during the classic ascent of Damavand 5671 m peak.Materials and Methods: 14 healthy male climbers (age = 23.85±5.93 years, height = 175.5±5.91 cm, weight =71.35±8.20 kg) participated voluntarily in this study. BP, HR and lung volumes were measured in basic (2000 M), BC (3100 m) the first day, C1 (3650 m) the first day, BC (3100 m) the second day after the one-night stopover, C1 (3650 m) the second day, C2 (4100 m) the second day, C2 (4100 M) third day after the one-night stopover, C3 (5000 m) and, peak (5671 m). Data were compared by repeated measures test at the significant level of P≤0.05 and Bonferroni post hoc test.Results: The results of repeated measures analysis were significant for HR, systolic BP, diastolic BP and MVV (P<0.05), but not significant for FVC and FEV1 (P≥0.05). BP was high in the base camp and the first camp and gradually decreased. HR continued to increase significantly with increasing altitude. MVV increased with increasing altitude and is reduced after the one-night stopover in each height.Conclusion: It can be concluded that climbing with classic method increased the HR and decreased systolic and diastolic BP of climbers. It was able to induce adaptation in lung volumes of climbers.