可通过有效控制风力机叶片的升力间接减小风力机的疲劳载荷,提高风力机的可靠性。该文建立了基于尾缘襟翼的风力机叶片试验模型静态升力控制系统仿真平台。该系统在上位机Matlab/Simulink中建立叶片试验模型静态升力的数学模型和系统控...可通过有效控制风力机叶片的升力间接减小风力机的疲劳载荷,提高风力机的可靠性。该文建立了基于尾缘襟翼的风力机叶片试验模型静态升力控制系统仿真平台。该系统在上位机Matlab/Simulink中建立叶片试验模型静态升力的数学模型和系统控制算法,利用下位机PLC进行实时数据采集和输出,并利用用于过程控制的OPC(OLEfor Process Control,OPC)技术实现上位机和下位机的实时数据通信。结果表明:该控制系统通过主动调节尾缘襟翼的偏转角度有效地减小了周期渐变风、周期阵风、阶梯风和湍流风风况下叶片的升力波动幅度。同时,使用单神经元PID控制器能更好地弥补风扰动引起的升力波动,其控制效果优于经典PID控制器。展开更多
Oligodendrocyte precursor cells(OPCs)are a heterogeneous multipotent population in the central nervous system(CNS)that appear during embryogenesis and persist as resident cells in the adult brain parenchyma.OPCs could...Oligodendrocyte precursor cells(OPCs)are a heterogeneous multipotent population in the central nervous system(CNS)that appear during embryogenesis and persist as resident cells in the adult brain parenchyma.OPCs could generate oligodendrocytes to participate in myelination.Recent advances have renewed our knowledge of OPC biology by discovering novel markers of oligodendroglial cells,the myelin-independent roles of OPCs,and the regulatory mechanism of OPC development.In this review,we will explore the updated knowledge on OPC identity,their multifaceted roles in the CNS in health and diseases,as well as the regulatory mechanisms that are involved in their developmental stages,which hopefully would contribute to a further understanding of OPCs and attract attention in the field of OPC biology.展开更多
文摘可通过有效控制风力机叶片的升力间接减小风力机的疲劳载荷,提高风力机的可靠性。该文建立了基于尾缘襟翼的风力机叶片试验模型静态升力控制系统仿真平台。该系统在上位机Matlab/Simulink中建立叶片试验模型静态升力的数学模型和系统控制算法,利用下位机PLC进行实时数据采集和输出,并利用用于过程控制的OPC(OLEfor Process Control,OPC)技术实现上位机和下位机的实时数据通信。结果表明:该控制系统通过主动调节尾缘襟翼的偏转角度有效地减小了周期渐变风、周期阵风、阶梯风和湍流风风况下叶片的升力波动幅度。同时,使用单神经元PID控制器能更好地弥补风扰动引起的升力波动,其控制效果优于经典PID控制器。
基金supported by grants from the National Natural Science Foundation of China (32271034,32070964,81971309,32170980,and 32300791)National Key Research and Development Program of China (2021ZD0201703)+4 种基金Chongqing Natural Science Fund for Distinguished Young Scholars (CSTB2023NSCQ-JQX0030)Guangdong Basic and Applied Basic Research Foundation (2022B1515020012,2021A1515110268,2023A1515010651)Shenzhen Medical Research Fund (A2303014)Shenzhen Fundamental Research Program (JCYJ20210324123212035,RCYX20200714114644167,ZDSYS20220606100801003,RCBS20210706092411028,and JCYJ20210324121214039)Shenzhen Key Laboratory of Chinese Medicine Active Substance Screening and Translational Research (ZDSYS20220606100801003).
文摘Oligodendrocyte precursor cells(OPCs)are a heterogeneous multipotent population in the central nervous system(CNS)that appear during embryogenesis and persist as resident cells in the adult brain parenchyma.OPCs could generate oligodendrocytes to participate in myelination.Recent advances have renewed our knowledge of OPC biology by discovering novel markers of oligodendroglial cells,the myelin-independent roles of OPCs,and the regulatory mechanism of OPC development.In this review,we will explore the updated knowledge on OPC identity,their multifaceted roles in the CNS in health and diseases,as well as the regulatory mechanisms that are involved in their developmental stages,which hopefully would contribute to a further understanding of OPCs and attract attention in the field of OPC biology.
