The Electromechanical Oxygen Regulator(EMOR)is a new type of aviator oxygen equipment.Positive pressure refers to the pressure difference between the breath pressure and the ambient pressure during pressurized oxygen ...The Electromechanical Oxygen Regulator(EMOR)is a new type of aviator oxygen equipment.Positive pressure refers to the pressure difference between the breath pressure and the ambient pressure during pressurized oxygen supply.The phenomenon of positive pressure fluctuation was believed to reduce the system performance.The current open-loop control method cannot solve this problem.In this paper,the mathematical model was established and main factors were analyzed.By combining experimental research and simulation calculation,it was determined that pressure fluctuation was caused by inlet pressure and diaphragm deformation together.With the increase of pulmonary ventilation volume,the influence of inlet pressure on fluctuation decreases gradually,while the proportion of diaphragm deformation increases rapidly.A closed-loop control strategy of Proportional Resonant with Feedforward Compensation(PRFC)was proposed to solve the problem and control parameters were obtained through co-simulation.The effectiveness of the control strategy was verified by experiments.The results show that the control strategy can enhance the anti-disturbance ability of the system and significantly reduce the pressure fluctuation range,which is beneficial to improving the overall system performance.展开更多
It is important to regulate the concentration of reactive oxygen species(ROS)in cells since they play important roles in metabolism.Thus,developing nanoreagents to control the ROS is critical.Herein,tellurium-doped ca...It is important to regulate the concentration of reactive oxygen species(ROS)in cells since they play important roles in metabolism.Thus,developing nanoreagents to control the ROS is critical.Herein,tellurium-doped carbon quantum dots(Te-CDs)were developed by a simple and efficient hydrothermal method,which can scavenge H2O2 to protect cells under ambient condition,but generateáOH under 808 nm irradiation as photodynamic application.This contribution presented a kind of novel CDs with dual-functions,which can potentially regulate ROS under different conditions.展开更多
文摘The Electromechanical Oxygen Regulator(EMOR)is a new type of aviator oxygen equipment.Positive pressure refers to the pressure difference between the breath pressure and the ambient pressure during pressurized oxygen supply.The phenomenon of positive pressure fluctuation was believed to reduce the system performance.The current open-loop control method cannot solve this problem.In this paper,the mathematical model was established and main factors were analyzed.By combining experimental research and simulation calculation,it was determined that pressure fluctuation was caused by inlet pressure and diaphragm deformation together.With the increase of pulmonary ventilation volume,the influence of inlet pressure on fluctuation decreases gradually,while the proportion of diaphragm deformation increases rapidly.A closed-loop control strategy of Proportional Resonant with Feedforward Compensation(PRFC)was proposed to solve the problem and control parameters were obtained through co-simulation.The effectiveness of the control strategy was verified by experiments.The results show that the control strategy can enhance the anti-disturbance ability of the system and significantly reduce the pressure fluctuation range,which is beneficial to improving the overall system performance.
基金the National Natural Foundation of China(21774130 and 51925306)National Key R&D Program of China(2018FYA0305800)+4 种基金the Key Research Program of Frontier Sciences,Chinese Academy of Sciences(QYZDB-SSW-JSC046)Key Research Program of the Chinese Academy of Sciences(XDPB08-2)the Strategic Priority Research Program of Chinese Academy of Sciences(XDB28000000)the International Partnership Program of Chinese Academy of Sciences(211211KYSB20170014)University of Chinese Academy of Sciences。
文摘It is important to regulate the concentration of reactive oxygen species(ROS)in cells since they play important roles in metabolism.Thus,developing nanoreagents to control the ROS is critical.Herein,tellurium-doped carbon quantum dots(Te-CDs)were developed by a simple and efficient hydrothermal method,which can scavenge H2O2 to protect cells under ambient condition,but generateáOH under 808 nm irradiation as photodynamic application.This contribution presented a kind of novel CDs with dual-functions,which can potentially regulate ROS under different conditions.
