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Measurements and characteristics of Al_(2)O_(3):Cr^(3+) coating for the proton beam imaging system

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Radiation Detection Technology and Methods 2017年第1期1卷 54-60页

作者： Zhirong Zeng quanzhi yu Shaohong Wei Bin Zhou Quan Ji Tianjiao Liang yuanbo Chen Institute of High Energy Physics Chinese Academy of Sciences(CAS)Beijing 100049China Dongguan Neutron Science Center Dongguan 523803China Beijing National Laboratory for Condensed Matter Physics Institute of PhysicsChinese Academy of ScienceBeijing 100190China

Introduction To set up an online proton beam diagnostic system near the neutron production target of China Spallation Neutron Source(CSNS),a luminescence coating sprayed on the target windowand a corresponding optic system were *** the work,the fabrication of Al_(2)O_(3):Cr^(3+) coating was *** on the sprayed samples were performed to analyze the characteristics of the Al_(2)O_(3):Cr^(3+) *** and tests of coating samples Three kinds of powders with different Cr concentrations were used to fabricate the luminescence coating *** flame spraying,plasma spraying and D-gun spraying processes were ***(PL),X-ray diffraction(XRD),scanned electron mirror(SEM)and radioluminescence experiment by 300 MeV deuterium beam were carried out to analyze and characterize the *** The emission spectrum excited by 532-nm laser has two obvious peaks at 692.9 nm and 694.3 *** samples by flame spraying process with the powders obtained from melting method show higher luminescence intensity than the samples by plasma spraying *** is observed that the luminescence intensity has some relationships with the alpha phase in the samples,which is deduced from the XRD and photoluminescence tests results.A lower temperature during the flame spraying process will help to keep more alpha phase in the *** selected four samples show successful fluoresced results in the radioluminescence *** The luminescence intensity of the coating is improved greatly by the studies on the fabrication process and the characteristics of the *** luminescence coating used in beam diagnostics will be fabricated by the confirmed technical *** works will be continued to improve the characteristics of the luminescence light by controlling Cr concentration and annealing in 1200∼2000℃ environment in the future.

关键词： Al_(2)O_(3):Cr^(3+)luminescence coating Beam diagnostics Spallation target

Design of imaging system for CSNS near-target beam diagnostics

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Radiation Detection Technology and Methods 2018年第2期2卷 38-46页

作者： Zhirong Zeng Shanhua Zhang Weilin Cheng quanzhi yu Shaohong Wei Bin Zhou Donghui Zhu Quan Ji Aijun Zeng Tianjiao Liang yuanbo Chen Institute of High Energy Physics Chinese Academy of Sciences(CAS)Beijing 100049China Dongguan Neutron Science Center Dongguan 523803China Shanghai Institute of Optics and Fine Mechanics Chinese Academy of ScienceShanghai 201800China Beijing National Laboratory for Condensed Matter Physics Institute of PhysicsChinese Academy of ScienceBeijing 100190China

Introduction China Spallation Neutron Source(CSNS)is an accelerator-based pulsed neutron source which produces neutron with spallation reaction induced by proton bombarding tungsten *** increasing beam powers and influences on target,near-target monitoring becomes extreme *** this situation,an optical imaging system for proton beam diagnostics and monitoring near the target is being developed at CSNS,which can provide real-time images of the beam on target and beam distribution *** imaging system design and development In the design of CSNS target imaging system,coating of Cr^(3+):Al_(2)O_(3) is used to convert particle radiation into emission *** to the geometry limits of CSNS target station,a special optical system was designed and fabricated to collect the emission *** the proton beams strike on the target,the coating on the target will be excited,emitting luminescence at the same *** mirrors and lenses of the optical system image the distribution of emission light into a radiation-hard imaging fiber,which transmits the images to the GigE camera located at low-dose area outside of the target *** was written on the LabView platform to control the camera and analyze the images on ***-up of the imaging system was manufactured to test and evaluate the performances of the *** important characteristics of the system were obtained and *** Tests on the mock-up of the system present reliably expectation for beam *** imaging system has been installed at CSNS *** work will be continued to improve the properties of the system.

关键词： Beam diagnostics Beam profile Imaging system Luminescent coating

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遂宁涪江流域总磷时空分布及环境容量研究

环境科学与技术 2018年第A2期41卷 100-103页

作者：蒋红斌余全智何鑫刘兵四川省遂宁市环境监测中心站四川遂宁629000

在中国总量控制制度不断推进的过程中,化学需氧量、氨氮排放总量得到有效控制,总磷逐渐成为影响水环境质量的重要因素之一,因此研究总磷的空间分布和时间变化有着重要的意义。文章以涪江流域遂宁段为例,对2016年总磷的时空分布进行分析... 详细信息

在中国总量控制制度不断推进的过程中,化学需氧量、氨氮排放总量得到有效控制,总磷逐渐成为影响水环境质量的重要因素之一,因此研究总磷的空间分布和时间变化有着重要的意义。文章以涪江流域遂宁段为例,对2016年总磷的时空分布进行分析评价。涪江干流水质总磷受到遂宁市城区生活污水、工业园区工业废水和郪江支流的影响。采用一维模型计算出涪江遂宁段总磷的环境容量,具有明显的优越性,沿岸水电站的修建对涪江干流遂宁境内水自净能力有很大的影响。

关键词：总磷水质评价水环境容量涪江

Linear-Quadratic Pareto Cooperative Game for Mean-Field Backward Stochastic System

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Journal of Systems Science & Complexity 2024年第3期37卷 947-964页

作者： WANG yu School of Control Science and Engineering Shandong UniversityJinan 250061China

This paper focuses on a Pareto cooperative differential game with a linear mean-field backward stochastic system and a quadratic form cost functional. Based on a weighted sum optimality method, the Pareto game is equivalently converted to an optimal control problem. In the first place,the feedback form of Pareto optimal strategy is derived by virtue of decoupling technology, which is represented by four Riccati equations, a mean-field forward stochastic differential equation(MF-FSDE),and a mean-field backward stochastic differential equation(MF-BSDE). In addition, the corresponding Pareto optimal solution is further obtained. Finally, the author solves a problem in mathematical finance to illustrate the application of the theoretical results.

关键词： Backward stochastic differential equation linear-quadratic control mean-field Pareto optimality

Generation of surface electrons in femtosecond laser-solid interactions

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Science China(Physics,Mechanics & Astronomy) 2006年第3期49卷 335-340页

作者： XU Miaohua1, LI yutong1, yuAN Xiaohui1,2, ZHENG Zhiyuan1, LIANG Wenxi1, yu quanzhi1, ZHANG Yi1, WANG Zhaohua1, WEI Zhiyi1 & ZHANG Jie1 1. Key Laboratory of Optical Physics, Institute of Physics, Chinese Academy of Sciences, Beijing 100080, China 2. State Key Laboratory of Transient Optics Technology, Chinese Academy of Sciences, Xi’an 710068, China nl.gov Key Laboratory of Optical Physics Institute of Physics Chinese Academy of Sciences Beijing 100080 China

The characteristics of hot electrons produced by p-polarized femtosecond laser-solid interactions are studied. The experimental results show that the outgoing electrons are mainly emitted in three directions: along the target surface, the normal direction and the laser backward direction. The electrons flowing along the target surface are due to the confinement of the electrostatic field and the surface magnetic field, while the electrons in the normal direction due to the resonant absorption.

关键词： hot electrons,surface magnetic field,femtosecond laser pulses

Topological Stability and Entropy for Certain Set-valued Maps

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Acta Mathematica Sinica,English Series 2024年第4期40卷 962-984页

作者： yu ZHANG yu Jun ZHU School of Mathematical Sciences Xiamen UniversityXiamen 361005P.R.China

In this paper,the dynamics(including shadowing property,expansiveness,topological stability and entropy)of several types of upper semi-continuous set-valued maps are mainly considered from differentiable dynamical systems points of *** is shown that(1)if f is a hyperbolic endomorphism then for eachε>0 there exists a C^(1)-neighborhood U of f such that the induced set-valued map F_(f,U)has theε-shadowing property,and moreover,if f is an expanding endomorphism then there exists a C^(1)-neighborhood U of f such that the induced set-valued map F_(f,U)has the Lipschitz shadowing property;(2)when a set-valued map F is generated by finite expanding endomorphisms,it has the shadowing property,and moreover,if the collection of the generators has no coincidence point then F is expansive and hence is topologically stable;(3)if f is an expanding endomorphism then for eachε>0 there exists a C^(1)-neighborhood U of f such that h(F_(f,U,ε))=h(f);(4)when F is generated by finite expanding endomorphisms with no coincidence point,the entropy formula of F is ***,the dynamics of the set-valued maps based on discontinuous maps on the interval are also considered.

关键词： Set-valued map orbit space hyperbolic endomorphism perturbation shadowing expansiveness topological stability entropy

A new liquid membrane diffusion model for characterizing the adsorption kinetics of europium by using a continuous measurement of adsorption platform

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Nuclear Science and Techniques 2024年第1期35卷 59-72页

作者： Hao-Qi yu Tao yu Jian-Hua Ye State Key Laboratory of Nuclear Resources and Environment East China University of TechnologyNanchang 330013China CGN Cangnan Nuclear Power Co. Ltd.Cangnan 325800China Jiangxi Province Key Laboratory of Polymer Micro/Nano Manufacturing and Devices East China University of TechnologyNanchang 330013China School of Nuclear Science and Engineering East China University of TechnologyNanchang 330013China

To explore the kinetic adsorption under continuous and nonequilibrium states, an integration of continuous measurement and adsorption platform kinetics method was proposed, which was initially called the ICM-AP kinetics method, and a corresponding kinetic adsorption experimental method was developed. Adsorption experiments of europium(Eu) on Ca-bentonite,Na-bentonite, and the D231 cation exchange resin were performed using the ICM-AP kinetics method and continuous measurements. Because the kinetic experimental results observed in this study were different from those of traditional batch adsorption data, pseudo-first-order or pseudo-second-order kinetic models were unsuitable for fitting the experimental ***, a liquid membrane diffusion(LMD) model was developed based on the assumption of simultaneous adsorption/desorption to discuss the mechanism of kinetic adsorption. The kinetic adsorption mechanism was also studied by using *** results indicated that the proposed adsorption model can fit the experimental data more suitably, and the adsorption/desorption behaviors of Eu on bentonite and the D231 resin were simultaneously observed, suggesting that the adsorption kinetics of Eu(Ⅲ) was mainly dominated by hydrated Eu(Ⅲ) ions on the liquid membrane.

关键词： ICM-AP method LMD model Adsorption mechanism Eu(Ⅲ)

Device design principles and bioelectronic applications for flexible organic electrochemical transistors

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International Journal of Extreme Manufacturing 2024年第1期6卷 126-153页

作者： Lin Gao Mengge Wu Xinge yu Junsheng yu State Key Laboratory of Electronic Thin Films and Integrated Devices School of Optoelectronic Science and EngineeringUniversity of Electronic Science and Technology of China(UESTC)Chengdu 610054People’s Republic of China Department of Biomedical Engineering City University of Hong KongHong Kong Special Administrative Region of ChinaPeople’s Republic of China

Organic electrochemical transistors(OECTs) exhibit significant potential for applications in healthcare and human-machine interfaces, due to their tunable synthesis, facile deposition, and excellent biocompatibility. Expanding OECTs to the fexible devices will significantly facilitate stable contact with the skin and enable more possible bioelectronic applications. In this work,we summarize the device physics of fexible OECTs, aiming to offer a foundational understanding and guidelines for material selection and device architecture. Particular attention is paid to the advanced manufacturing approaches, including photolithography and printing techniques, which establish a robust foundation for the commercialization and large-scale fabrication. And abundantly demonstrated examples ranging from biosensors, artificial synapses/neurons, to bioinspired nervous systems are summarized to highlight the considerable prospects of smart healthcare. In the end, the challenges and opportunities are proposed for fexible OECTs. The purpose of this review is not only to elaborate on the basic design principles of fexible OECTs, but also to act as a roadmap for further exploration of wearable OECTs in advanced bio-applications.

关键词： flexible organic electrochemical transistors wearable bioelectronics manufacturing approaches device physics neuromorphic applications

A guidance and control design with reduced information for a dual-spin stabilized projectile

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Defence Technology（防务技术） 2024年第3期33卷 494-505页

作者： yu Wang Jiyan yu Xiaoming Wang Jia Fangxiu Intelligent Ammunition Technology National Defense Key Discipline Laboratory Nanjing University of Science and TechnologyNanjingJiangsu210094China

In this paper,an integrated guidance and control method based on an adaptive path-following controller is proposed to control a spin-stabilized projectile with only translational motion information under the constraint of an actuator,uncertainties in aerodynamic parameters and measurements,and control system *** to the fairly high rotation speed,the dynamic model of this missile is strongly nonlinear,uncertain and coupled in pitch,yaw and roll channels.A theoretical equivalent resultant force and uncertainty compensation method are comprehensively used to realize decoupling of pitch and *** response to the strong nonlinear and time-varying characteristics of the dynamic system,the quasi-linear model whose parameters are obtained by interpolation of points selected as the segmentation points in the trajectory envelope,is used for calculation in each *** cope with the system uncertainty caused by model approximation,parameter uncertainty and ballistic interference,an extended state estimator is used to compensate the output feedback according to the test ballistic *** order to improve the tracking efficiency and ensure the tracking error convergence with only translational motion information,the virtual guide point,whose derivative is deduced according to the Lyapunov principle,is calculated in real time according to the projection relationship between the real-time position and the reference trajectory,and a virtual line-of-sight angle and the backstepping method are used for the design of the guidance and control *** order to avoid the influence of control input saturation on the guidance and control performance due to the actuator limitation and improve the robustness of the system,an anti-saturation compensator is designed according to the two-step *** feasibility and effectiveness of the path-following controller is verified through closed-loop flight simulations with measurement,control,and condition *** result

关键词： Spin-stabilized projectile Reduced information Path-following control Extended state observer Coupled nonlinear system Input saturation