Abstract: Provided is a self-assembling peptide, a preparation method, the self-assembling peptide formulations and use, and it is related to the field of biotechnology. The self-assembling peptide provided by the present disclosure has a general formula as shown in AC-Pro-X1-X3-X2-X3-X1-X3-X2-Pro-amide. Through experiments, the inventors of the present disclosure found that the self-assembling peptide provided by the present disclosure, because solubility is high and difficulty of synthesis and purification is less compared with a traditional self-assembling peptide, is more feasible for industrial production, and even cheaper to produce. In mass synthesis and purification, the number of purification decreases, the single purification amount increases, the purity of a crude peptide can reach 90% or more, and the cost is greatly reduced.

Abstract: This application relates to an indoor positioning method and system and an electronic device. The method includes: calculating distances between an unknown node and at least three known nodes; obtaining at least three square regions around the at least three known nodes by using the distances as radiuses, and obtaining a minimum overlapping region based on overlapping parts of the at least three square regions; reducing the minimum overlapping region in an equal proportion by using a geometric center of the minimum overlapping region as a center to obtain a new square region; calculating an optimal vertex location of the new square region through iteration; and forming a new smaller region around the optimal vertex location by using the optimal vertex location as a new central point, and using an optimal vertex location of the smaller region as an estimated location of the unknown node.