Charge transport in oil impregnated paper impacts the insulation performance of a transformer.This paper proposes a simulation method for the charge transport in oil impregnated paper insulation.The transient upstream...Charge transport in oil impregnated paper impacts the insulation performance of a transformer.This paper proposes a simulation method for the charge transport in oil impregnated paper insulation.The transient upstream finite element method(FEM)is applied to the transport equations of bipolar charges for establishing a numerical simulation model of charge transport in oil impregnated paper insulation.The method is validated by experimental results.The charge transport and electric field distribution in single-layer oil impregnated paper insulation under different temperature gradients is simulated.The trends of the simulation results are seen to agree with the corresponding experimental results.This paper conducts exploratory research into the simulation of charge transportation phenomenon in oil impregnated paper,and is of importance to the design of oil impregnated paper insulation.展开更多
The treatment and healing of infected skin lesions is one of the major challenges in surgery.To solve this problem,collagen I(Col-I)and the antibacterial agent hydroxypropyltrimethyl ammonium chloride chitosan(HACC)we...The treatment and healing of infected skin lesions is one of the major challenges in surgery.To solve this problem,collagen I(Col-I)and the antibacterial agent hydroxypropyltrimethyl ammonium chloride chitosan(HACC)were composited into the bacterial cellulose(BC)three-dimensional network structure by a novel membrane-liquid interface(MLI)culture,and a Col-I/HACC/BC(CHBC)multifunctional dressing was designed.The water absorption rate and water vapor transmission rate of the obtained CHBC dressing were 35.78±2.45 g/g and 3084±56 g m^(-2)⋅day^(-1),respectively.The water retention of the CHBC dressing was significantly improved compared with the BC caused by the introduced Col-I and HACC.In vitro results indicated that the combined advantages of HACC and Col-I confer on CHBC dressings not only have outstanding antibacterial properties against Staphylococcus aureus(S.aureus)compared with BC and CBC,but also exhibit better cytocompatibility than BC and HBC to promote the proliferation and spread of NIH3T3 cells and HUVECs.Most importantly,the results of in vivo animal tests demonstrated that the CHBC dressings fully promoted wound healing for 8 days and exhibited shorter healing times,especially in the case of wound infection.Excellent skin regeneration effects and higher expression levels of collagen during infection were also shown in the CHBC group.We believe that CHBC composites with favorable multifunctionality have potential applications as wound dressings to treat infected wounds.展开更多
基金supported by the National Basic Research Program(973 Program)(2011CB209404)National Natural Science Foundation of China(51477120).
文摘Charge transport in oil impregnated paper impacts the insulation performance of a transformer.This paper proposes a simulation method for the charge transport in oil impregnated paper insulation.The transient upstream finite element method(FEM)is applied to the transport equations of bipolar charges for establishing a numerical simulation model of charge transport in oil impregnated paper insulation.The method is validated by experimental results.The charge transport and electric field distribution in single-layer oil impregnated paper insulation under different temperature gradients is simulated.The trends of the simulation results are seen to agree with the corresponding experimental results.This paper conducts exploratory research into the simulation of charge transportation phenomenon in oil impregnated paper,and is of importance to the design of oil impregnated paper insulation.
基金This work is supported by the National Natural Science Foundation of China(Grant No.31760265 and 82160355)grant awarded by Natural Science Foundation of Jiangxi Province(20171ACB21036 and 20192ACB80008).
文摘The treatment and healing of infected skin lesions is one of the major challenges in surgery.To solve this problem,collagen I(Col-I)and the antibacterial agent hydroxypropyltrimethyl ammonium chloride chitosan(HACC)were composited into the bacterial cellulose(BC)three-dimensional network structure by a novel membrane-liquid interface(MLI)culture,and a Col-I/HACC/BC(CHBC)multifunctional dressing was designed.The water absorption rate and water vapor transmission rate of the obtained CHBC dressing were 35.78±2.45 g/g and 3084±56 g m^(-2)⋅day^(-1),respectively.The water retention of the CHBC dressing was significantly improved compared with the BC caused by the introduced Col-I and HACC.In vitro results indicated that the combined advantages of HACC and Col-I confer on CHBC dressings not only have outstanding antibacterial properties against Staphylococcus aureus(S.aureus)compared with BC and CBC,but also exhibit better cytocompatibility than BC and HBC to promote the proliferation and spread of NIH3T3 cells and HUVECs.Most importantly,the results of in vivo animal tests demonstrated that the CHBC dressings fully promoted wound healing for 8 days and exhibited shorter healing times,especially in the case of wound infection.Excellent skin regeneration effects and higher expression levels of collagen during infection were also shown in the CHBC group.We believe that CHBC composites with favorable multifunctionality have potential applications as wound dressings to treat infected wounds.
