Mathematical methodology and software package for investigation of nonstationary hydrogen permeability in membranes used in electrolysers and hydrogen fuel cells
Abstract As part of the methodology to control gas permeability of functional materials, mathematical approach is considered that takes into account a diffusion process through a plate with the boundary conditions of the 1st and 2nd types. The methodology under discussion provides methods for estimating parameters of the diffusion by using methods of exceptional points, functional scale and statistical moments. Computer software package HPRON has been developed to provide mathematical modeling, planning, processing and data interpretation of different variants of gas permeability method. The results are used to optimize the performance of the membrane electrode assembly (MEA) for the automotive fuel cell and electrolyzer applications with a perfluorinated proton-conducting membrane such as nafion.
The utilization of medical services by the floating population is affected by many factors. The study was based on the data from the questionnaire survey of the floating population in Dalian, Hierarchical logistic regression method was used to analyze the factors influencing the utilization of medical services of floating population. The results showed that: the utilization rate of medical services of floating population was lower; age, education, income and residence had a significant impact on the floating population’s medical services utilization.