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Open Access Article
1 - Modeling the correlation between drought, number of rainy days and evapotranspiration in Fars province
maryam khosravian alireza entezari Mohammad baaghide rahman zandiDrought is one of the recurring phenomena in all parts of the world with high-rainfall and low-rainfall climates and it is consider as a natural disaster. Iran is also one of the countries which involved in this phenomenon in different places. Its characteristics, such MoreDrought is one of the recurring phenomena in all parts of the world with high-rainfall and low-rainfall climates and it is consider as a natural disaster. Iran is also one of the countries which involved in this phenomenon in different places. Its characteristics, such as the severity, duration, and extent of the drought, are vary from place to place and its damages is depending on the country's planning. In this regard, the necessity of knowing the correct weather conditions and climatic characteristics of different regions have become clear to planners through environmental, economic, agricultural and industrial potentials and their optimal use, as well as predicting the occurrence of natural disasters such as floods and droughts. In this study, for evaluating and comparing drought and wetness events, the precipitation data for the period (1987-2017), as well as the evaporation and transpiration data and the number of rainy days during a statistical period of 10 years (2008-2017) were obtained from 9 stations in Fars province. The standardized precipitation index (SPI) was used, and the Arc GIS software, the drought zoning, evaporation and transpiration maps, and the number of rainy days in the province were plotted. In the studied years, Fars province has faced a near-normal state for 24 years in and drought for 5 years and wetness for one year. The drought situation was studied and analyzed in Shiraz city in the continuation. According to the obtained results, the drought in Shiraz city is more severe than the other parts of the province and it will continue in the future. The SPI index has the highest correlation with the parameters of the number of rainy days with a rate of (0.46) and evaporation and transpiration with a rate of (0.26) in 2012 and 2008. Manuscript profile -
Open Access Article
2 - Detection and prediction of forest level changes in Guilan province using satellite images and geomod model
sahar abdollahi Vahid NasiriFollowing the rapid economic and social development in recent decades, human activity to use natural resources has been reflected in the form of infrastructure and agricultural activities. This has severely affected forests as an important ecosystem which are considered MoreFollowing the rapid economic and social development in recent decades, human activity to use natural resources has been reflected in the form of infrastructure and agricultural activities. This has severely affected forests as an important ecosystem which are considered potential environmental resources for future evolution. The purpose of this study is to detect changes of Guilan province forest levels during a period of 20 years (1996-2016), also modeling and predict these changes for the next 15 years using the geomod model. Landsat TM and OLI sensor images were used to prepare land use maps for 1996, 2006, and 2016 periods. Satellite images were classified into forest and non-forest classes using the maximum likelihood method and multiple educational samples. The geomod model was simulated based on the changes made in the period 1996-2006, changes in forest cover using the variables of height, slope, direction, distance from residential, distance from a road, distance from forest, with implementation for 2016. The predicted validation results of the forest cover map in 2016 is indicator the overall accuracy and value of the kappa index equal to 94.19% and 0.9159, respectively. Based on the results of detecting changes during the study period (1996-2016), 1054.97 hectares of forest area in Guilan province has been reduced and with the continuation of this trend and stable conditions in the next 15 years until 2031, another 871 hectares will be reduced from its level. Given the importance role of Hyrcanian forests, it is necessary to conduct multi-time studies to monitor and detect changes. Obviously, the information from such studies can be used in managerial and strategic planning. Manuscript profile -
Open Access Article
3 - Assessment of individual and collective risk of leakage in South Pars Refinery based on estimation of reproducibility of connections and modeling of PHAST software
Gholamreza Jafarinejad Sina Davazdah Emami Mohammad VelayatzadehIn this research, in order to investigate the scope of the effect of two types of fire, Flash Fire and Jet Fire, and to determine the individual and collective risk related to the gas tanks of South Pars refineries, the quantitative risk assessment method was used using MoreIn this research, in order to investigate the scope of the effect of two types of fire, Flash Fire and Jet Fire, and to determine the individual and collective risk related to the gas tanks of South Pars refineries, the quantitative risk assessment method was used using PHAST software. To obtain reproducibility for the inlet and outlet valve flange leakage scenario, all connections in the path were examined separately for each scenario and their reproducibility was calculated. The results related to the gas tanks of South Pars refineries showed that among the leaks, the leakage related to the inlet valve flange and the outlet valve flange, according to their location (close to the car parking lot and vehicle traffic road as well as the traffic route) people and buildings around it) is more important. The individual risk contour diagram is the result of the combination of two scenarios, inlet valve and outlet valve, which shows the amount of deaths per year within the specified limits. This means that the collective risk of the area under investigation is high. Considering the conditions in the South Pars Refinery in terms of regional weather conditions, wind speed and direction, prevailing wind direction, the location of the buildings in the station and its population distribution, we come to the conclusion that in the event of a leakage incident, the consequences It is in the form of release of flammable gas and two possible types of fire, Jet Fire and Flash Fire. Manuscript profile -
Open Access Article
4 - Evaluating the effect of organizational culture on green management with the mediating role of psychological empowerment of employees (Case study: West Mazandaran Electricity Distribution Company)
Mehdi Jahanshahi Mir Hamid Taghavi Alireaza AliahmadiAccording to many researchers, appropriate cultural conditions and contexts can create the environment that is environmentally sensitive and strives to use resources efficiently and create social responsibility. The aim of this study is to evaluate the effect of organiz MoreAccording to many researchers, appropriate cultural conditions and contexts can create the environment that is environmentally sensitive and strives to use resources efficiently and create social responsibility. The aim of this study is to evaluate the effect of organizational culture on green management with the mediating role of psychological empowerment in West Mazandaran Electricity Distribution Company as a study sample. This study is an applied research in terms of purpose and it falls into the category of cross sectional - survey research based on its nature. The main data collection tool is a questionnaire has validated by three methods of content validity, structural validity and convergent validity. In addition, Cronbach's alpha has been 0.96 and the composite reliability of all dimensions of the questionnaire has been above 0.7. The statistical sample of the study includes 98 employees of West Mazandaran Electricity Distribution Company have selected by simple random sampling method and Cochran's formula for uncertain communities. To test the hypotheses, structural equation modeling (SEM) technique with Smart PLS3 software has been used.The results have shown that 1.Organizational culture has a direct and significant effect on psychological empowerment of employees 2. Organizational culture has a direct and significant effect on green management 3. Psychological empowerment of employees has a direct and significant effect on green management. In other words, organizational culture has a direct and indirect effect (through psychological empowerment of employees) on green management. Manuscript profile
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