The anaerobic digestion of biodegradable substrates and waste is a well-known process that can be used worldwide to produce renewable fuel called biogas. At the time writing, most widespread way using biogas its direct usage in combined heat power internal combustion engines (CHP-ICEs) generate electricity heat. However, generates emissions, which turn have an impact on human health. Therefore,...

suitable supplier selection is the most important factor in supplier chain management; so that correct decisions in this phase, caused to reduce costs, make permanent relationship with suppliers and strong competitive strategy in market. in this paper, by reviewing the past articles, important related criteria found and then weighting of criteria and evaluation of alternatives were done with fu...

Soil density fractionation is a common tool to separate organic matter of different function and turnover. But it has not been tested so far how much soil material necessary obtain reproducible results. A reduction chemicals like polytungstate would further save valuable resources. Here, we show that weight from 25 5 g was significantly affecting Compared the commonly used 10–25 g, this corresp...