in this paper, a multi purpose function is presented for optimum design in circular hydrostatic axial bearings. one or more parameters that are directly or indirectly dependent on given data are optimized. usually in the local optimization methods, it is not possible to optimize several parameters simultaneously. in this research, simultaneous optimization of the power loss and the oil temperat...

The direct amination of aliphatic C-H bonds represents a most valuable transformation in organic chemistry. While a number of transition metal-based catalysts have been developed and investigated for this purpose, the possibility to execute this transformation with biological catalysts has remained largely unexplored. Here, we report that cytochrome P450 enzymes can serve as efficient catalysts...

With worldwide petroleum resources dwindling, it is urgent to look for renewable fuels. One of major potential products from plant biomass is γ-valerolactone (GVL), which is renewable, safe to store and can be used as a liquid fuel, food additive, green solvent and an intermediate in the synthesis of many value-added chemicals. The synthesis of GVL is commonly accomplished by hydrogenation of l...