فهرست مطالب محمد رضایی نژاد

In oredr to reduce costs and save time for the membrane manufacturing process, it is necessary to improve the quality of membranes by modeling usage. In this study, Flory Huggins model was used to predict quaternary-system containing polyether sulfone, N-Methyl-2-pyrrolidone, water and used alkanes as an additive. Due to the solubility parameters and molar alkane volumes, the interaction parameters changed which influenced the membrane morphology. In the meantime, modeling showed that hexane had no effect on the immiscibility gap, and the decane had a greater effect compared to hexane. But the tetradecane, due to the increased interactions, could greatly increase the immiscibility gap and increase the thermodynamic instability. Hence, those instabilities can become subjected to faster membrane entelechy, construct a pores skin layer, and change the membrane morphology. Whatever the immiscibility gap rise, the proportion of pores in the skin layer will increase and vice versa.

Climatic classification of geographical areas from the distant past has been done. With the difference that in the past the traditional methods and GIS technology today with the advancement of modern methods are used. As well as the use of multiple climatic parameters in traditional methods alone would not be cardiac regions climate reality. Therefore, in recent years, researchers have tried to use the number of parameters affecting climate and more modern methods, real climate regions of the video provider. The purpose of this article the climatic regionalization of southern Khorasan Province with the method of factor analysis and cluster and Spatial Autocorrelation and more climatic elements in determining the type of weather for the area to be incorporated.To improve the results of climatic regionalization of synoptic meteorological stations facts and climatological was used. For this purpose a matrix 34 * 11 Includes 7 synoptic station and 4 climatological station. The results of this analysis showed that climate affected province of 6 factors in order of importance are, Temp (temperature), humidity of the atmosphere, windy- dust, Frost, rainy, sunny (radiation). The exercise component of about 96.5 percent of the interpretation of climatological behaviour. Cluster analysis on the factors mentioned there are 6 region of air and water in the province showed. Semi-warm and dry temperate zone, Hot and arid area, Hot and dry semi-desert area, Cold and semi-arid mountainous area, Wilderness area, Hot and dry desert area