the study of spatial and temporal changes in climate parameters, is one the most important issues in the world's climate research. study of changes in cloud cover as one of the most important climate parameters is important, because clouds are in top of hydrologic cycle and changes in them make changes in spatial and temporal variations in other climate parameters. in this study, the spati...

     Data reduction is used to aggregate or amalgamate the large data sets into smaller and manageable information pieces in order to fast and accurate classification of different attributes. However, excessive spatial or spectral data reduction may result in losing or masking important radiometric information. Therefore, we conducted this research to evaluate the effectiveness of the different...

developing countries, including iran, have a high degree of volatility of macroeconomic variables. fluctuations inex change rate, bank interest rate and inflation rate can create insecure environment for in vestorsin iran. hence, this study examined the impact of macroeconomic variables on the tobin’s q index for the sugar companies of tehran stock exchange (tse) during the period between1380-1...

investigations in recent decades have shown an unexpected increase in aerosol concentrations in metropolitan and industrialized regions. it was sometimes followed by heat islands and probably decreases in precipitation due to an inadvertent cloud overseeding process. particle pollutants act like small cloud condensation nuclei in which they form large collections of small droplets in cloud. col...

Abstract N owadays, conservation, maintenance and monitoring of natural resources according to estimated benefits and costs, plays an important role in economic growth and sustainable development. Economic development along with environmental protection, while preserving economic competitiveness by providing eco-friendly technologies, will prevent of loss and waste of environmental r...