Abstract: A cell matrix nerve graft for repairing peripheral nerve injury and a preparation method thereof are provided. The cell matrix nerve graft comprises acellular matrix and a scaffold, wherein the acellular matrix is obtained by decellularization after secretion and formation of stem cells, and the acellular matrix is wrapped around the scaffold. The defects of autologous nerve transplantation repair can be overcome and the immunogenicity of allogeneic cell transplantation repair is avoided. The cell matrix nerve graft beneficial to nerve cell proliferation and migration is provided, a microenvironment beneficial to axon growth is established, the purposes of nerve regeneration and function repair are achieved, and a feasible solution is provided for clinical treatment of nerve defects.

Abstract: The present disclosure provides an extrapolation method of low rotational speed characteristics of a compressor, which is suitable for acquisition the low rotational speed characteristics of a gas turbine on the ground or an aircraft engine, the extrapolation method takes into account an application condition of a similarity principle and specialties of the low rotational speed operation condition of the compressor, and comprises modifying exponents of the similarity principle to obtain the optimal exponents by an optimization algorithm, and applying a coefficient fitting method for a variable operating condition calculation of the gas turbine to the extrapolation of low rotational speed characteristic of the compressor to obtain the low rotational speed characteristic.