درخت حوزه‌های تخصصی

The Internet along with many advantages has some disadvantages, and the lack of a complete understanding of cyberspace can cause damage in terms of mate selection method. This article attempts to address some of the disadvantages and threats that virtual spaces create in mate selection method and tries to introduce some strategies to prevent and reduce these emerging injuries. This study was conducted using a questionnaire survey and the reference method. The population of this research is all youth between 20 to 34 years old who live in Jahrom in 1395. The sampling methods used here is the cluster sampling method. The sample size has been calculated by the Cochran formula, and 320 people were selected. The questionnaire was 0.77 alpha general questionnaire and statistical analysis was performed by SPSS software in the form of analyzing the correlation coefficient and regression. In this research, after describing the stages of major indicators of family position as the most important unit of society, and after declaring the ideas about mate selection and cyberspace relationships, and mentioning them as opportunities and threats, emerging injuries following by cyberspace relationships and their influence on the mate selection methods are discussed. In this study, family attachment, traditional values and the level of religiosity are effective in young people attitudes to cyberspace mate selection, as well as effective variables have an impact on mate selection method with a coefficient of 0.611% were able to predict changes. In other words, effective independent variables have been able to define 0.611% of changes in mate selection methods, and the rest of the effects are due to some variables that are not included in this study.

In this article, it has been tried to analyze the mental satisfaction of the quality of life in different regions in terms of objective development. For this purpose, districts no. 3, 6, and 9 of Mashhad city which through the measures of education, income, and employment were respectively among the deprived, the average, and the privileged regions were selected as the case study areas. Moreover, to measure the mental satisfaction of the local people of the quality of life, a questionnaire considering three basic dimensions of quality of life, i.e. economic, environmental, and physical sustainability (residential environment, the quality of these infrastructures) was designed. The sample size equals 385 people who according to the population of study area were divided into clusters. The research findings showed that there is little or no significant difference between these districts in terms of the desired measures, so that in terms of economic issues, the district no. 9 had a better condition than the other two. There was no significant difference between the districts no. 3 and 9. Regarding satisfaction of the quality of housing and infrastructure, the inhabitants in the district no. 6 showed less satisfaction than others. In this regard, no significant difference was observed between the districts no. 3 and 6; however, regarding satisfaction of the environmental situation, there was a significant difference between the districts no. 3 and 9, whereas the district no. 6 was an exception. Generally, the district no. 9 in Mashhad has a better condition in terms of objective development, social status, and quality of mental life. In contrast, regarding these indices, the district no. 3 is among the poorest regions, so in terms of quality of mental life is in a average state. Yet, the district no. 6 due to its development and the middle social status has a less unfavorable condition in terms of the quality of life.

This study aims to analyze the effect of green policies on employees' eco-initiatives with the mediating role of environmental concerns and effective commitment to the organization. This study is applied in purpose and uses descriptive and survey methods. The statistical population consisted of 350 employees of environmental organizations in Semnan province. According to Cochran's formula, a sample of 189 individuals was determined using convenience sampling. The data was analyzed using SPSS 16 and Smart PLS-2 software, employing the structural equation modeling approach with the partial least squares method. The results suggest that content validity was assessed through an expert panel, while reliability was evaluated and confirmed using Cronbach's alpha coefficient method and composite reliability. The results indicate that green policies have a positive and significant effect on environmental concerns, effective commitment to the organization, and employees' eco-initiatives. Additionally, environmental concerns have a positive and significant effect on the effective commitment to the organization and employees' eco-initiatives. Moreover, environmental concerns and effective commitment to the organization do not mediate the relationship between green policies and employees' eco-initiatives. Therefore, it is suggested that managers of environmental organizations pay adequate attention to being green in formulating organizational policies so that they can create more commitment and responsibility in employees and thus produce more initiatives in the environmental field.

A sensitivity analysis of the flood safety of Solaimantangeh dam using a regional climate change simulation is presented. Based on the output of the CCSM (Community Climate Change System Model) general circulation model, the NIRCM (North of Iran Regional Climate Model) computes regional scale output with 50 km spatial resolution and 21 vertical layers. Using the SRES (Special Report Emission Scenario) “B1” Climate Change Scenario when applied to the Tajan river basin, where Solaimantangeh dam is located, NIRCM reduces significantly the bias in Annual Maximum Event total Precipitation (AMEP) & Annual Maximum Daily Precipitation (AMDP) that CCSM shows. The stream flow change scenario is then simulated using SSARR (Stream flow Synthesis and Reservoir Regulation) model. A rainfall-runoff model was implemented using precipitation and temperature projected by CCSM and NIRCM. The model demonstrated that average Stream flow would increases 38.7% and the variability would increases 14.3%. This remarkable increase in projected annual maximum flow for the next 20 years (2004-2023) should be a significant negative signal to water resources managers. The results indicate that the number of floods remains almost the same, but that the magnitude of a single flood event and the recovery from it become worse.