Historic developments, current technologies and potential of nanotechnology to develop next generation solar cells with improved efficiency| Performance evaluation of the effect of waste paper on groundnut shell briquette| Status and benefits of renewable energy technologies in the rural areas of Ethiopia: a case study on improved cooking stoves and biogas technologies| Thermal energy optimization of building integrated semi-transparent photovoltaic thermal systems| Gasification of 'loose' groundnut shells in a throathless downdraft gasifier| Comparative analysis of biodiesels from calabash and rubber seeds oils| Techno-economic analysis of a wind-diesel hybrid power system in the South Algeria| Steam gasification of wood biomass in a fluidized biocatalytic system bed gasifier: a model development and validation using experiment and boubaker polynomials expansion scheme BPES| Combustion characteristics of diesel engine using producer gas and blends of jatropha methyl ester with diesel in mixed fuel mode