1. introduction variability and changes in precipitation amounts, including extreme precipitation and droughts, trigger relevant societal and environmental impacts. atmospheric circulation strongly determines precipitation variability over southern half of iran. the influence of prevalent synoptic situations on the distribution of precipitation amounts needs to be understood, as well as their f...

Ambient particulate matter contains polar multifunctional oxygenates that partition between the vapor and aerosol phases. Vapor pressure predictions are required to determine the gas-particle partitioning of such organic compounds. We present here a method based on atomistic simulations combined with the Clausius-Clapeyron equation to predict the liquid vapor pressure, enthalpies of vaporizatio...

a method for predicting liquid densities of binary mixtures from heat of vaporization and liquid densityat boiling point temperature (δhvap and n b ρ ) as scaling constants, is presented. b2(t) follows a promisingcorresponding-states principle. calculation of α(t) and b(t), the two other temperature-dependentconstants of the equation of state, are made possible by scaling. as a result δhvap and...

the energy requirement of vacuum membrane distillation (vmd) with or without recirculation was modelled using both experimental results and theoretical data. the trends are generally consistent between the theoretical and experimental data. thermal energy contributes the most to the total energy required for the vmd process. to lower the thermal energy cost, waste heat resource and heat recover...

Hydrogen fluoride (HF) has found a wide variety of uses in the chemical process industry. It is used as an alkylation catalyst in the making of high-octane fuel, it provides a fluoride ion source in the electrolytic production of aluminum, and it is also the fluorine source in fluorocarbon manufacture. Intrinsic to the successful design of separation and heat-transfer equipment utilizing HF is ...