Background and Aim: Political trust affects the relationship between the people and the state, which is one of the essential factors for managing the country's affairs better, developing and expanding, and meeting the people’ s needs. The present research intends to answer the question by a meta-analysis method that, in general, what variables affect the political trust and how these variables explained and enlightened the political trust. Method: The quantitative meta-analysis is a mechanism for implementing research. The purpose of this approach is to integrate, systematically review and harmonize studies in a certain field of research. The statistical population of this study was 18 researches that13 samples of research documents were selected to integrate and identify its impact. Findings: The Analytical Findings of the research indicate that political trust is considered as the main and dependent variable which is influenced by the governance (effect size-0. 290), justice (effect size-0. 321), social capital (effect size – 0. 378), religiosity (effect size-0. 435), social satisfaction (effect size-0. 212), political capital (effect size-0. 263), anomy (effective size-0. 288), discrimination (effect size-0. 375), security (effect size-0. 347) and social network (effect size-0. 311) ). In sum, the above variables were able to explain and enlighten political trust by effect size-0. 327, Z-8. 481 and sig-0. 004. Conclusion: The results show that political trust greatly reduces the social distance between government institutions and citizens and has a very strong relationship with the people, government, institutions and intermediary groups between the people and the government. According to the result of the research, the level of political trust is moderate. The level of political trust is high (38%), medium (32%) and low (30%)

The current research was conducted with the aim of the effect of attachment style on emotion regulation with the mediating role of identity style. The research method was descriptive and structural equation analysis. The statistical population of the research was all second year high school students of Kashan city in the academic year of 1400-1401, of which 500 people were selected by random cluster method. Data were collected based on three questionnaires: Gross & Jan (2003) Emotional Regulation Inventory, Identity Style Scale (6G-ISI) and Collins and Reid (1990) Attachment Style Questionnaire. The data are obtained by structural equation modeling and using Laserl 8.8 and 26 spss software. analyzed. Based on the results, secure attachment style at a significance level of 0.01, avoidant attachment style at a significance level of 0.05, and ambivalent attachment style at a significance level of 0.01 directly predicted emotion regulation. Among the three attachments, secure attachment style predicted emotion regulation at a significant level of 0.01, with the mediation of identity styles. Informational identity style at a significance level of 0.01, confused identity style at a significance level of 0.05 directly predicted emotion regulation. Among the three attachments, only the secure attachment style at a significance level of 0.01 had a significant role in predicting the normative identity style. According to the results of this study, emotion regulation is one of the most important constructs of educational psychology and an important factor in determining mental health and successful performance. It is in education that the factors affecting emotion regulation and its antecedents should be identified. Planning for training and holding educational workshops in this field in schools is suggested for students.

In this study we investigate effect of firm size on income smooting by using data of firms listed in Tehran stock Exchange. We examined 352 firms accepted in Tehran stock Exchange 2001-2007 period. First the sample companies were classified in to firms smooting and no smootings groups based on Eckel index. Finally, logit model for test hypothese was applicated.The results demonstrate significant evidence of a positive association between firm size and income smooting.

One of the important issues in the production of concrete is environmental variability that affects the concrete and elements constructed from this material. Due to the importance of different characteristics of concrete in short- and long-term conditions, this article aims to investigate the influence of initial temperature conditions of self-compacting concrete on its long-term characteristics and determine the initial optimal temperature of concrete. For these purposes, several experiments under three temperature conditions of 5, 20, and 40 degree-of-Celsius were conducted to evaluate the rheology and mechanical properties of fresh concrete in the range of 7 and 28 days. In these experiments, alternative mineral admixtures of cement such as micro-silica, fly ash, and zeolite were used to build the concrete specimens. Results demonstrate that the mechanical properties of the specimens increase with increasing initial temperature in the short term, while such properties significantly decrease in the long term compared to the specimens constructed under lower initial temperature. Moreover, the fluidity of self-compacting concrete increases with increasing initial temperature.