Abstract: A preparation method of a hydrogel for promoting growth of mesenchymal stem cells (MSCs), and a preparation method and an application method are provided. The hydrogel is rich in MSC-derived exosomes, which can effectively promote wound healing both for diabetic foot ulcer (DFU) caused by bacterial infection and for DFU caused by skin scratch. Moreover, healing speed for the DFU is fast and healing area for the DFU is wide.

Abstract: The present disclosure discloses a safety pipe loop and method for strain monitoring of mountainous pipelines. The safety pipe loop may include a plurality of magnetic test detectors and a protective shell for protecting the plurality of magnetic test detectors. The number of the plurality of magnetic test detectors may be set to 4n, n is an integer number greater than or equal to 1. An angle between any two adjacent detectors of the plurality of magnetic test detectors may be 180°/2n. At least two of the plurality of magnetic test detectors may be connected in parallel through a data transmission line and output data through a data transmission interface. An outer layer of the protective shell may include non-magnetic hard alloy, and an inner layer of the protective shell may include non-metallic materials.

Abstract: The present disclosure discloses a safety pipe loop and method for strain monitoring of mountainous pipelines. The safety pipe loop may include a plurality of magnetic test detectors and a protective shell for protecting the plurality of magnetic test detectors. The number of the plurality of magnetic test detectors may be set to 4n, n is an integer number greater than or equal to 1. An angle between any two adjacent detectors of the plurality of magnetic test detectors may be 180°/2n. At least two of the plurality of magnetic test detectors may be connected in parallel through a data transmission line and output data through a data transmission interface. An outer layer of the protective shell may include non-magnetic hard alloy, and an inner layer of the protective shell may include non-metallic materials.

Abstract: A non-contact real-time stress monitoring method for buried pipeline and a device thereof are provided. The method includes the following steps: Step S10: selecting pipelines with the same material, pipe diameter and wall thickness as the buried pipeline being monitored for lift-off effect test, and obtaining a plurality of sets of lift-off magnetic field gradient modulus under a plurality of sets of lift-off heights; Step S20: using MATLAB to fit the G1-h relationship curve for obtaining the values of parameters a1, b1, a2, and b2 in a quantitative relationship formula containing the lift-off gradient modulus and the lift-off height; Step S30: placing a non-contact monitoring device directly above the buried pipeline being monitored to obtain a magnetic field gradient modulus of the buried pipeline; and Step S40: calculating an absolute value of real-time stress of the buried pipeline according to the magnetic field gradient modulus of the buried pipeline.