To solve the disadvantages of the traditional Z-source inverter(ZSI),this paper investigates a series-type switched-inductor Z-source inverter(SSI-ZSI)topology.It not only preserves the advantages of the traditional Z...To solve the disadvantages of the traditional Z-source inverter(ZSI),this paper investigates a series-type switched-inductor Z-source inverter(SSI-ZSI)topology.It not only preserves the advantages of the traditional ZSI,but also improves the voltage gain.On the condition of the same voltage gain,the capacitor voltage stress is reduced,the soft start characteristic can be achieved and the inverter can be immune to the damage of the inrush current.The circuit structure and operating principle are analyzed in detail;the simulation model and the experimental platform are built.The simulation and experimental results verify the rationality and superiority of the circuit topology.展开更多
Fused deposition modelling(FDM)is a commonly used 3D printing technology.The development of FDM materials was essential for the product quality of FDM.In this work,a series of polycaprolactone(PCL)-based composites fo...Fused deposition modelling(FDM)is a commonly used 3D printing technology.The development of FDM materials was essential for the product quality of FDM.In this work,a series of polycaprolactone(PCL)-based composites for low-temperature FDM were developed.By melt blending technique,different ratios of starch were added into PCL to improve the performances of FDM,and the printability,tensile strength,rheological properties,crystallization behaviors and biological performances of the composites were studied.The PCL/starch composite had the best performance in FDM process with the starch ratio of 9 ph at 80–90°C.The melting strength and solidification rate of PCL/starch composites were improved.The starch also increased the crystallization temperature,degree of crystallinity and crystallization rate of PCL/starch composites,while had no negative effects on the tensile strength of PCL.Due to the low printing temperature,various kinds of bioactive components were added into PCL/starch composites for preparation of antibacterial and biocompatible materials for FDM.The present work provides a new method to develop novel low-temperature FDM materials with various functions.展开更多
文摘To solve the disadvantages of the traditional Z-source inverter(ZSI),this paper investigates a series-type switched-inductor Z-source inverter(SSI-ZSI)topology.It not only preserves the advantages of the traditional ZSI,but also improves the voltage gain.On the condition of the same voltage gain,the capacitor voltage stress is reduced,the soft start characteristic can be achieved and the inverter can be immune to the damage of the inrush current.The circuit structure and operating principle are analyzed in detail;the simulation model and the experimental platform are built.The simulation and experimental results verify the rationality and superiority of the circuit topology.
基金supported by the National Natural Science Foundation of China(61874007,12074028,and 52102152)Shandong Provincial Major Scientific and Technological Innovation Project(2019JZZY010209)+2 种基金the Key-area Research and Development Program of Guangdong Province(2020B010172001)the Fundamental Research Funds for the Central Universities(buctrc201802,buctrc201830,and buctrc202127)Beijing Outstanding Young Scientist Program(BJJWZYJH01201910010024)。
基金supported by National Natural Science Foundation of China(Grant No.51873012)National Key Research and Development Program of China(Grant No.2016YFC1100404)+2 种基金Beijing Municipal Natural Science Foundation(Grant No.7161001)Fundamental Research Funds for the Central Universities(Grant No.XK1802-2)Research Projects on Biomedical Transformation of China-Japan Friendship Hospital(Grant No.PYBZ1832).
文摘Fused deposition modelling(FDM)is a commonly used 3D printing technology.The development of FDM materials was essential for the product quality of FDM.In this work,a series of polycaprolactone(PCL)-based composites for low-temperature FDM were developed.By melt blending technique,different ratios of starch were added into PCL to improve the performances of FDM,and the printability,tensile strength,rheological properties,crystallization behaviors and biological performances of the composites were studied.The PCL/starch composite had the best performance in FDM process with the starch ratio of 9 ph at 80–90°C.The melting strength and solidification rate of PCL/starch composites were improved.The starch also increased the crystallization temperature,degree of crystallinity and crystallization rate of PCL/starch composites,while had no negative effects on the tensile strength of PCL.Due to the low printing temperature,various kinds of bioactive components were added into PCL/starch composites for preparation of antibacterial and biocompatible materials for FDM.The present work provides a new method to develop novel low-temperature FDM materials with various functions.
