研究设计了一种太阳能光伏电源系统,并成功应用于户外电力设备在线监测系统中。根据设备功耗需要和安装地点的气候情况,确定了光伏阵列和蓄电池的容量;研究了不同光照和温度条件下,光伏阵列的最大功率点跟踪(Maxmum Power Point Tracki...研究设计了一种太阳能光伏电源系统,并成功应用于户外电力设备在线监测系统中。根据设备功耗需要和安装地点的气候情况,确定了光伏阵列和蓄电池的容量;研究了不同光照和温度条件下,光伏阵列的最大功率点跟踪(Maxmum Power Point Tracking,简称MPPT)算法,使光伏阵列始终工作在最大功率输出状态,保证了蓄电池的充电效率;研究设计了多电池组协调控制与充-放电优化管理策略,有效延长了蓄电池的使用寿命。设计开发的太阳能光伏电源系统在架空输电线路状态监测系统中得到了成功应用。现场运行结果表明,该系统运行高效、稳定,完全满足工程应用需求。展开更多
Biological neurons can receive inputs and capture a variety of external stimuli,which can be encoded and transmitted as different electric signals.Thus,the membrane potential is adjusted to activate the appropriate fi...Biological neurons can receive inputs and capture a variety of external stimuli,which can be encoded and transmitted as different electric signals.Thus,the membrane potential is adjusted to activate the appropriate firing modes.Indeed,reliable neuron models should take intrinsic biophysical effects and functional encoding into consideration.One fascinating and important question is the physical mechanism for the transcription of external signals.External signals can be transmitted as a transmembrane current or a signal voltage for generating action potentials.We present a photosensitive neuron model to estimate the nonlinear encoding and responses of neurons driven by external optical signals.In the model,a photocell(phototube)is used to activate a simple FitzHugh-Nagumo(FHN)neuron,and then external optical signals(illumination)are imposed to excite the photocell for generating a time-varying current/voltage source.The photocell-coupled FHN neuron can therefore capture and encode external optical signals,similar to artificial eyes.We also present detailed bifurcation analysis for estimating the mode transition and firing pattern selection of neuronal electrical activities.The sampled time series can reproduce the main characteristics of biological neurons(quiescent,spiking,bursting,and even chaotic behaviors)by activating the photocell in the neural circuit.These results could be helpful in giving possible guidance for studying neurodynamics and applying neural circuits to detect optical signals.展开更多
Langmuir-Blodgett films containing bacteriorhodopsin were deposited on ITO conduc-tive electrodes.A sandwiched photocell with a junction structure of ITO/bR/electrolyte/ITO has beenconstructed,in which the bR LB film ...Langmuir-Blodgett films containing bacteriorhodopsin were deposited on ITO conduc-tive electrodes.A sandwiched photocell with a junction structure of ITO/bR/electrolyte/ITO has beenconstructed,in which the bR LB film was directly put into contact with an aqueous electrolyte immobi-lized in an agar gel.Under visible light irradiation,the photocell produced a transient photocurrent due tothe change of light intensity,which characterized vision imitative material.A photoalarm device based ondifferential responsivity phenomena was fabricated.展开更多
文摘研究设计了一种太阳能光伏电源系统,并成功应用于户外电力设备在线监测系统中。根据设备功耗需要和安装地点的气候情况,确定了光伏阵列和蓄电池的容量;研究了不同光照和温度条件下,光伏阵列的最大功率点跟踪(Maxmum Power Point Tracking,简称MPPT)算法,使光伏阵列始终工作在最大功率输出状态,保证了蓄电池的充电效率;研究设计了多电池组协调控制与充-放电优化管理策略,有效延长了蓄电池的使用寿命。设计开发的太阳能光伏电源系统在架空输电线路状态监测系统中得到了成功应用。现场运行结果表明,该系统运行高效、稳定,完全满足工程应用需求。
基金Project supported by the National Natural Science Foundation of China(No.11672122)the Hongliu First-Class Disciplines Development Program of Lanzhou University of Technology,China。
文摘Biological neurons can receive inputs and capture a variety of external stimuli,which can be encoded and transmitted as different electric signals.Thus,the membrane potential is adjusted to activate the appropriate firing modes.Indeed,reliable neuron models should take intrinsic biophysical effects and functional encoding into consideration.One fascinating and important question is the physical mechanism for the transcription of external signals.External signals can be transmitted as a transmembrane current or a signal voltage for generating action potentials.We present a photosensitive neuron model to estimate the nonlinear encoding and responses of neurons driven by external optical signals.In the model,a photocell(phototube)is used to activate a simple FitzHugh-Nagumo(FHN)neuron,and then external optical signals(illumination)are imposed to excite the photocell for generating a time-varying current/voltage source.The photocell-coupled FHN neuron can therefore capture and encode external optical signals,similar to artificial eyes.We also present detailed bifurcation analysis for estimating the mode transition and firing pattern selection of neuronal electrical activities.The sampled time series can reproduce the main characteristics of biological neurons(quiescent,spiking,bursting,and even chaotic behaviors)by activating the photocell in the neural circuit.These results could be helpful in giving possible guidance for studying neurodynamics and applying neural circuits to detect optical signals.
基金the National Natural Science Foundation of China
文摘Langmuir-Blodgett films containing bacteriorhodopsin were deposited on ITO conduc-tive electrodes.A sandwiched photocell with a junction structure of ITO/bR/electrolyte/ITO has beenconstructed,in which the bR LB film was directly put into contact with an aqueous electrolyte immobi-lized in an agar gel.Under visible light irradiation,the photocell produced a transient photocurrent due tothe change of light intensity,which characterized vision imitative material.A photoalarm device based ondifferential responsivity phenomena was fabricated.
