The UF membrane with a narrow and uniform pore size distribution and a low tendency to foul has significant applications in wastewater treatment. A major hindrance in the preparation of the UF membrane with these features is the lack of a scalable and economical membrane fabrication method. Herein, we devise a new strategy to prepare a high-quality polyvinylidene fluoride/polymethyl acrylate/cellulose acetate (PVDF/PMMA/CA) blend UF membrane via a combination of the etching mechanism with the traditional Loeb–Sourirajan (L-S) phase inversion method. Different concentrations of silicon dioxide (SiO₂) nanoparticles (NP) in the membrane matrix were etched by using a 0.2 M hydrofluoric acid (HF) solution in a coagulation bath. This strategy provided the membrane with unique features along with a narrow and uniform pore size distribution (0.030 ± 0.005 μm). The etched membrane exhibits an increase of 2.3 times in pure water flux (PWF) and of 6.5 times in permeate flux(PF), with a slight decrease in rejection ratio (93.2% vs. 97%) when compared to than that of the un-etched membrane. Moreover, this membrane displayed outstanding antifouling ability, i.e., a flux recovery ratio (FRR) of 97% for 1000 mg/L bovine serum albumin (BSA) solution, a low irreversible fouling ratio of 0.5%, and highly enhanced hydrophilicity due to the formation of pores/voids throughout the membrane structure. The aforementioned features of the etched membrane indicate that the proposed method of etching SiO₂ NP in membrane matrix has a great potential to improve the structure and separation efficiency of a PVDF/PMMA/CA blend membrane.

Purpose: The new round of medical reform is a significant exploration of reform in the public service sector in China. Health insurance regulatory departments, medical institutions, and patients, as critical stakeholders in China’s medical reform, play a crucial role in the success of the reform through their strategic interactions. Patients and Methods: Starting from the perspective of bounded rationality, applies evolutionary game theory to establish an evolutionary game model for the collaborative governance of health insurance regulatory departments, medical institutions, and patients and analyzes the stability of each party’s strategy and the sensitivity of parameters in the tripartite game system. Results: The study shows that an equilibrium point will be formed when medical institutions provide reasonable treatment, patients choose to accept treatment, and health insurance regulatory departments adopt a lenient regulatory strategy, maximizing the interests of all parties involved in the game. Factors such as the benefits of unreasonable treatment by medical institutions, fines, and regulatory costs impact the decision-making of health insurance regulatory departments. To maximize social welfare, health insurance regulatory departments should reform payment methods, adjust medical service behaviors of medical institutions, and guide the rational allocation of medical resources; the government should increase subsidies for the operation of medical institutions and the intensity of penalties; regulatory departments should reduce regulatory costs and introduce third-party forces to strengthen health insurance supervision further. Conclusion: The research findings of this paper will provide valuable insights into some countries’ medical and health reform.

As a new business model, E-commerce brings new changes to the global economy and society. So, can E-commerce development policies promote high-quality agricultural development? This article regards the pilot construction of national e-commerce demonstration cities as a quasi-natural experiment for the development of e-commerce. Based on the E-commerce pilot and economic and social development data of national prefecture-level cities from 2004 to 2018, the agricultural total factor productivity calculated by the Fare-Primont index method is used as the characterization of the quality of urban agricultural development, and an empirical model is constructed under the progressive Differences-in-Differences framework. This paper empirically tests the overall impact of E-commerce development on the high-quality development of agriculture and its sources, analyzes the heterogeneity and dynamics of the impact, and investigates the possible impact mechanism. The result shows that from the overall impact and its sources, the development of E-commerce in cities has a positive impact on the high-quality development of agriculture, and the impact is mainly due to its role in promoting technological innovation and economies of scale. From the perspective of heterogeneity, the larger the population size of a city, the more significant the level of e-conomic development or Internet development. From the perspective of the dynamic impact, the positive impact of e-commerce development becomes more significant over time. With the passage of time, the impact of E-commerce on high-quality agricultural development policies shows a trend of first increasing and then decreasing. Overall, this study provides empirical evidence for the rationality and effectiveness of policies and measures related to E-commerce to promote the high-quality development of agriculture.