in this study, activated sludge process for wastewater treatment in a refinery was investigated. for such purpose, a laboratory scale rig was built. the effect of several parameters such as temperature, residence time, effect of leca (filling-in percentage of the reactor by leca) and uv radiation on cod removal efficiency were experimentally examined. maximum cod removal efficiency was obtained...

A new scheme for the implementation of programmable FIR digital filters with 100% operational efficiency is presented in this paper. The term 100% operational efficiency implies that no zero bits have to be inserted between successive in−put data words in order the filter input to be synchronized with the filter output. Both the input data and the filter out−put are in two’s complement LSB−firs...

Data envelopment analysis (DEA) is one of non-parametric methods for evaluating efficiency of each unit. Limited resources in healthcare economy is the main reason in measuring efficiency of hospitals. In this study, a bootstrap interval data envelopment analysis (BIRDEA) is proposed for measuring the efficiency of hospitals affiliated with the Hamedan University of Medical Sciences. The propos...