The normal supply of energy is related to the stable development economy and society. Forecasting consumption helps prepare for energy. In study forecasting, different scholars have used forecasting models. This paper uses five-year data in Beijing-Tianjin-Hebei region grey fractional FGM(1, 1) model analyze next six years. Then, three places predicted. advantage score that it can get more accu...

the entanglement at zero-temperature is studied in a two-qubit xz spin-1/2 chain model in anexternal magnetic field which is applied in the z direction. we have obtained an analytical relation forthe effect of the external magnetic field on the concurrence. it is shown that the ground state of thesystem depends on the strength of exchange coupling. we have shown that the analytical relation oft...