针对传感器发展现状、特点及应用,利用STM32微控制器与轻量级TCP/IP协议栈结合的方式实现了传统传感器的智能化,并利用在程序中编程技术实现了传感器电子数据表格TEDS(Transducer Electronic Data Sheets)的在线更新。一方面实现了传统...针对传感器发展现状、特点及应用,利用STM32微控制器与轻量级TCP/IP协议栈结合的方式实现了传统传感器的智能化,并利用在程序中编程技术实现了传感器电子数据表格TEDS(Transducer Electronic Data Sheets)的在线更新。一方面实现了传统传感器的智能化,使其能够自动识别、即插即用,并支持在线更新与升级,另一方面实现了传感器的网络化,方便传感器的远程访问与控制。展开更多
Disruption prediction and mitigation is a crucial topic,especially for future large-scale tokamaks,due to disruption’sconcomitant harmful effects on the devices.On this topic,disruption prediction algorithm takes the...Disruption prediction and mitigation is a crucial topic,especially for future large-scale tokamaks,due to disruption’sconcomitant harmful effects on the devices.On this topic,disruption prediction algorithm takes the responsibility to giveaccurate trigger signal in advance of disruptions,therefore the disruption mitigation system can effectively alleviate theharmful effects.In the past 5 years,a deep learning-based algorithm is developed in HL-2A tokamak.It reaches a truepositive rate of 92.2%,a false positive rate of 2.5%and a total accuracy of 96.1%.Further research is implementedon the basis of this algorithm to solve three key problems,i.e.,the algorithm’s interpretability,real-time capability andtransferability.For the interpretability,HL-2A’s algorithm gives saliency maps indicating the correlation between thealgorithm’s input and output by perturbation analysis.The distribution of correlations shows good coherence with thedisruption causes.For the transferability,a preliminary disruption predictor is successfully developed in HL-2M,a newlybuilt tokamak in China.Although only 44 shots are used as the training set of this algorithm,it gives reasonable outputswith the help of data from HL-2A and J-TEXT.For the real-time capacity,the algorithm is accelerated to deal with an inputslice within 0.3 ms with the help of some adjustments on it and TFLite framework.It is also implemented into the plasmacontrol system and gets an accuracy of 89.0%during online test.This paper gives a global perspective on these results anddiscusses the possible pathways to make HL-2A’s algorithm a more comprehensive solution for future tokamaks.展开更多
Nanopositioning stage based on piezoelectric(PZT)actuators and flexure mechanisms has been widely used in dual-stage.Its favorable positioning accuracy and dynamic response can guarantee the high performance of the du...Nanopositioning stage based on piezoelectric(PZT)actuators and flexure mechanisms has been widely used in dual-stage.Its favorable positioning accuracy and dynamic response can guarantee the high performance of the dual-stage.Here the vertical axis motion dual-stage is designed with piezoelectric actuator for the fine-stage and ball-screw drive integrated with wedge sliding mechanisms for the coarse-stage.The aim of the dual-stage is to meet the stringent requirement of scanning over a relative large range with high accuracy.The design results of the piezo-actuated nanopositioning stage show good static and dynamic performance,validated by the simulation of finite element analysis(FEA).Hysteresis nonlinearity due to the use of piezoelectric stacks for actuation is studied and compensated by aproportional-integral(PI)feedback controller.To qualify the design of the motion ranges and resolutions,an experiment platform is established.The experimental results show that the proposed dual-stage has a full range of 12 mm with the resolution of 40 nm.Guideline is provided for the design methodology of the vertical motion dual-range stages.展开更多
A phosphorescent organic light emitting diode by using tetrafluorotetracyanoquinodimethane （F4 TCNQ） as the indium-tin-oxide modification layer and 4,4＇-bis（earbazol-9-yl）biphenyl （CBP） as the hole transporting...A phosphorescent organic light emitting diode by using tetrafluorotetracyanoquinodimethane （F4 TCNQ） as the indium-tin-oxide modification layer and 4,4＇-bis（earbazol-9-yl）biphenyl （CBP） as the hole transporting layer is reported. CBP doped with a green phosphorescent dopant, tris（2-（p-tolyl）pyridine） iridium（III） （Ir（mppy）3） is used as the emission layer in this device, and the maximum current efficiency of 31.3 cd/A is achieved. Further- more, low efficiency roll-off of 10.4% is observed with device luminance increasing from 100 cd/m2 （29. 7 cd/A） to lO000 cd/m2 （26.5 cd/A）. It is demonstrated that a charge-generation area is formed at F4 TCNQ/CBP interface, which will benefit hole injection into the hole transporting layer. Moreover, use of the CBP hole transporting layer will benefit the low efficiency roll-off by broadening triplet exciton formation, as well as by avoiding accumulation of unbalanced carrier at the hole transporting layer/emission layer interface.展开更多
文摘针对传感器发展现状、特点及应用,利用STM32微控制器与轻量级TCP/IP协议栈结合的方式实现了传统传感器的智能化,并利用在程序中编程技术实现了传感器电子数据表格TEDS(Transducer Electronic Data Sheets)的在线更新。一方面实现了传统传感器的智能化,使其能够自动识别、即插即用,并支持在线更新与升级,另一方面实现了传感器的网络化,方便传感器的远程访问与控制。
基金Project supported by the National MCF R&D Program of China(Grant Nos.2018YFE0302100 and 2019YFE03010003).The authors wish to thank all the members at South Western Institute of Physics for providing data,technique assistance and co-operating during the experiment.
文摘Disruption prediction and mitigation is a crucial topic,especially for future large-scale tokamaks,due to disruption’sconcomitant harmful effects on the devices.On this topic,disruption prediction algorithm takes the responsibility to giveaccurate trigger signal in advance of disruptions,therefore the disruption mitigation system can effectively alleviate theharmful effects.In the past 5 years,a deep learning-based algorithm is developed in HL-2A tokamak.It reaches a truepositive rate of 92.2%,a false positive rate of 2.5%and a total accuracy of 96.1%.Further research is implementedon the basis of this algorithm to solve three key problems,i.e.,the algorithm’s interpretability,real-time capability andtransferability.For the interpretability,HL-2A’s algorithm gives saliency maps indicating the correlation between thealgorithm’s input and output by perturbation analysis.The distribution of correlations shows good coherence with thedisruption causes.For the transferability,a preliminary disruption predictor is successfully developed in HL-2M,a newlybuilt tokamak in China.Although only 44 shots are used as the training set of this algorithm,it gives reasonable outputswith the help of data from HL-2A and J-TEXT.For the real-time capacity,the algorithm is accelerated to deal with an inputslice within 0.3 ms with the help of some adjustments on it and TFLite framework.It is also implemented into the plasmacontrol system and gets an accuracy of 89.0%during online test.This paper gives a global perspective on these results anddiscusses the possible pathways to make HL-2A’s algorithm a more comprehensive solution for future tokamaks.
基金supported by the National Natural Science Foundation of China(No.51135009)
文摘Nanopositioning stage based on piezoelectric(PZT)actuators and flexure mechanisms has been widely used in dual-stage.Its favorable positioning accuracy and dynamic response can guarantee the high performance of the dual-stage.Here the vertical axis motion dual-stage is designed with piezoelectric actuator for the fine-stage and ball-screw drive integrated with wedge sliding mechanisms for the coarse-stage.The aim of the dual-stage is to meet the stringent requirement of scanning over a relative large range with high accuracy.The design results of the piezo-actuated nanopositioning stage show good static and dynamic performance,validated by the simulation of finite element analysis(FEA).Hysteresis nonlinearity due to the use of piezoelectric stacks for actuation is studied and compensated by aproportional-integral(PI)feedback controller.To qualify the design of the motion ranges and resolutions,an experiment platform is established.The experimental results show that the proposed dual-stage has a full range of 12 mm with the resolution of 40 nm.Guideline is provided for the design methodology of the vertical motion dual-range stages.
文摘A phosphorescent organic light emitting diode by using tetrafluorotetracyanoquinodimethane （F4 TCNQ） as the indium-tin-oxide modification layer and 4,4＇-bis（earbazol-9-yl）biphenyl （CBP） as the hole transporting layer is reported. CBP doped with a green phosphorescent dopant, tris（2-（p-tolyl）pyridine） iridium（III） （Ir（mppy）3） is used as the emission layer in this device, and the maximum current efficiency of 31.3 cd/A is achieved. Further- more, low efficiency roll-off of 10.4% is observed with device luminance increasing from 100 cd/m2 （29. 7 cd/A） to lO000 cd/m2 （26.5 cd/A）. It is demonstrated that a charge-generation area is formed at F4 TCNQ/CBP interface, which will benefit hole injection into the hole transporting layer. Moreover, use of the CBP hole transporting layer will benefit the low efficiency roll-off by broadening triplet exciton formation, as well as by avoiding accumulation of unbalanced carrier at the hole transporting layer/emission layer interface.
