A concentration of heavy metals (Pb, Cd, Zn), an electrical conductivity and water density at Sungai Singingi by using an experimental method have been carried out. Water sampling at Sungai Singingi that crosses the village ...

A research has been done about the determination of heavy metal concentrations such as Pb, Cu, Zn and electrical conductivities of industrial liquid waste of some rubber factories in Pekanbaru. The method that used in ...

The study of solar energy conversion to electrical energy by using silicon diode in cylindrical cells has been experimentally investigated. Silicon cells is connected to series and parallel for each 25 and 50 diode with ...