Abstract: A method for evaluating energy efficiency of electric arc furnace steelmaking comprises: obtaining original smelting information of the electric arc furnace; processing the original smelting information, and calculating an electrical energy efficiency evaluation index and a chemical energy efficiency evaluation index for process operation; wherein the electrical energy efficiency evaluation index comprises circuit efficiency, transformer tap capacity utilization rate and electrical energy thermal efficiency, and the chemical energy efficiency evaluation index comprises oxygen utilization rate, carbon powder utilization rate and chemical energy thermal efficiency; and evaluating an energy utilization condition of the electric arc furnace comprehensively based on the electrical energy efficiency evaluation index and the chemical energy efficiency evaluation index.

Abstract: Exendins or exendin analogs modified by one or more PEG derivatives that may be linked to one or more amino acids of the exendins or exendin analogs are provided. The PEG derivatives may have branched structure set forth in any one of formulas I-IV. Compositions including the PEG derivative modified exendin or exendin analog, methods of making or administering the modified exendin or exendin analog, and various uses thereof are also provided.