Water regulation of the Xiaolangdi Reservoir of the Yellow River was chosen as a case to investigate variations in concentrations and bioavailability of heavy m
The potential health risks of airbe bacteria emission from a wastewater treatment process have been concemed.However,few studies have investigated the differenc
Considering an insurer who is allowed to make risk-free and risky investments, as in Tang et al.(2010), the price process of the investment portfolio is describ