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Demonstration of a distributed feedback laser diode working as a graded-potential-signaling photonic neuron and its application to neuromorphic information processing

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Science China(Information Sciences) 2020年第6期63卷 176-183页

作者： bowen ma Weiwen ZOU State Key Laboratory of Advanced Optical Communication Systems and Networks Intelligent Microwave Lightwave Integration Innovation Center (iMLic) Department of Electronic Engineering Shanghai Jiao Tong University

We find that a commonly-used distributed feedback laser diode(DFB-LD) can work as a gradedpotential-signaling photonic neuron. Through theoretical and experimental demonstration, DFB-LDs are proved useful for three graded-potential-signaling-based neuromorphic processing applications of the pattern recognition, the single-wavelength implementation of spike timing dependent plasticity(STDP), and the sound azimuth measurement. The pattern recognition with a full-width-at-half-maximum(FWHM) of 1 μs is realized in the experiment.

关键词： neuromorphic photonics graded-potential-signaling photonic neuron pattern recognition optical spike timing dependent plasticity sound azimuth measurement

Time-inconsistent stochastic linear-quadratic control problem with indefinite control weight costs

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Science China mathematics 2024年第1期67卷 211-236页

作者： Qi Lü bowen ma School of mathematics Sichuan UniversityChengdu 610064China

A time-inconsistent linear-quadratic optimal control problem for stochastic differential equations is *** introduce conditions where the control cost weighting matrix is possibly *** such conditions,we obtain a family of closed-loop equilibrium strategies via multi-person differential *** result extends Yong’s work(2017) in the case of stochastic differential equations,where a unique closed-loop equilibrium strategy can be derived under standard conditions(namely,the control cost weighting matrix is uniformly positive definite,and the other weighting coefficients are positive semidefinite).

关键词： linear-quadratic optimal control problem time-inconsistent cost functional generalized Riccati equation indefinite control weight cost closed-loop equilibrium strategy

Towards an intelligent photonic system

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Science China(Information Sciences) 2020年第6期63卷 80-96页

作者： Weiwen ZOU bowen ma Shaofu XU Xiuting ZOU Xingjun WANG State Key Laboratory of Advanced Optical Communication Systems and Networks Intelligent Microwave Lightwave Integration Innovation Center (iMLic) Department of Electronic EngineeringShanghai Jiao Tong University State Key Laboratory of Advanced Optical Communication Systems and Networks School of Electronics Engineering and Computer Science Peking University

The emerging intelligence technologies represented by deep learning have broadened their applications to various fields. Beyond the conventional electronics-based processing systems, the convergence of photonics and artificial intelligence(AI) technology enhances the performance and learning ability of AI. In this review, we propose the concept of an intelligent photonic system(IPS), illustrating it as a developing architecture with three different versions. For each version of IPS, we review several representative *** we discuss the challenges towards an IPS and provide some prospects for the future development.

关键词： intelligent photonic system deep learning artificial intelligence optical neural network neuromorphic photonics

Synthesis and Antibacterial Properties of ZIF-8/Ag-Modified Titanium Alloy

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Journal of Bionic Engineering 2022年第2期19卷 507-515页

作者： Mingrui Li Yongjie Wei bowen ma Yang Hu Dongdong Li Xiaoqiang Cui Key Laboratory of Automobile materials of MOE Department of Materials Science and EngineeringJilin UniversityChangchun 130022China State Key Laboratory for materials Processing and Die and Mould Technology School of Materials Science and EngineeringHuazhong University of Science and TechnologyWuhan 430074China

The loosening of implant due to bacterial infection brings great difficulties to the implantation of bionic titanium *** this study,the Zeolitic Imidazolate Framework 8(ZIF-8)and silver ions were added to the surface of titanium alloy to obtain a uniform coating,which has nice biological activity and antibacterial *** material structure characterizations,such as X-ray diffraction(XRD),scanning electron microscope(SEM),X-ray photoelectron spectroscopy(XPS),proved that titanium is successfully modified with ZIF-8 and silver *** has micro-and nano-level characteristics,rough porous morphology,and excellent apatite inducing *** water contact angle experiment shows that the addition of ZIF-8 greatly increases the hydrophilicity of material,which provides conditions for the attachment of *** polarization curve obtained from the electrochemical test proves that the addition of ZIF-8 coating improves the corrosion resistance of *** release of silver ion has a strong growth inhibitory effect on ***,and exhibits excellent antibacterial ***,the preparation of ZIF-8/Ag coatings on 3D printed titanium provides a new option for the development of orthopedic implants.

关键词： Zeolitic imidazolate framework-8 Antibacterial Osseointegration Surface modifcatio

Deep-learning-powered photonic analogto-digital conversion

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Light(Science & Applications) 2019年第1期8卷 611-621页

作者： Shaofu Xu Xiuting Zou bowen ma Jianping Chen Lei Yu Weiwen Zou State Key Laboratory of Advanced Optical Communication Systems and Networks Intelligent Microwave Lightwave Integration Innovation Center(iMLic)Department of Electronic EngineeringShanghai Jiao Tong University200240 ShanghaiChina

Analog-to-digital converters(ADCs)must be high speed,broadband,and accurate for the development of modern information systems,such as radar,imaging,and communications systems;photonic technologies are regarded as promising technologies for realizing these advanced ***,we present a deep-learning-powered photonic ADC architecture that simultaneously exploits the advantages of electronics and photonics and overcomes the bottlenecks of the two technologies,thereby overcoming the ADC tradeoff among speed,bandwidth,and *** supervised training,the adopted deep neural networks learn the patterns of photonic system defects and recover the distorted data,thereby maintaining the high quality of the electronic quantized data succinctly and *** numerical and experimental results demonstrate that the proposed architecture outperforms state-ofthe-art ADCs with developable high throughput;hence,deep learning performs well in photonic ADC *** anticipate that the proposed architecture will inspire future high-performance photonic ADC design and provide opportunities for substantial performance enhancement for the next-generation information systems.

关键词： thereby Deep overcome

An interpretable machine learning strategy for pursuing high piezoelectric coefficients in (K_(0.5)Na_(0.5))NbO_(3)-based ceramics

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npj Computational materials 2023年第1期9卷 1-11页

作者： bowen ma Xiao Wu Chunlin Zhao Cong Lin Min Gao Baisheng Sa Zhimei Sun College of materials Science and Engineering Fuzhou UniversityFuzhou 350108China School of materials Science and Engineering Beihang UniversityBeijing 100191China

Perovskite-type lead-free piezoelectric ceramics allow access to illustrious piezoelectric coefficients(d33)through intricate composition design and experimental *** a swift and accurate technology for identifying(K,Na)NbO_(3)(KNN)-based ceramic compositions with high d33 in exceedingly large“compositional”space will establish an innovative research paradigm surpassing the traditional empirical trial-and-error ***,we demonstrate an interpretable machine learning(ML)framework for quick evaluation of KNN-based ceramics with high d33 based on data from published ***,a thorough feature construction was carried out from the global and local dimensions to establish tree regression models with d33 as the target ***,the feature-property mapping rules of KNN-based piezoelectric ceramics are further optimized through feature *** intuitively understand the correlation mechanisms between ML regression targets and features,the sure independence screening and sparsifying operator(SISSO)method was employed to extract the essential descriptors to explain d33.A straightforward descriptor,e^((NMB-MVB))·ST=(IDA)^(2),consisting of only four easily accessible parameters,can accelerate the evaluation of a series of novel KNN-based ceramics with high d33 while exhibiting strong theoretical *** work not only provides a tool for the rapid discovery of high piezoelectric performance in KNN-based ceramics but also offers a data-driven route for the design of property descriptors in perovskites.

关键词： ceramics ceramic piezoelectric

Comb-based photonic neural population for parallel and nonlinear processing

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Photonics Research 2022年第1期10卷 174-182页

作者： bowen ma JUNFENG ZHANG WEIWEN ZOU State Key Laboratory of Advanced Optical Communication Systems and Networks Intelligent Microwave Lightwave Integration Innovation Center(imLic)Department of Electronic EngineeringShanghai Jiao Tong UniversityShanghai 200240China

It is believed that neural information representation and processing relies on the neural population instead of a single *** neuromorphic photonics,photonic neurons in the form of nonlinear responses have been extensively studied in single devices and temporal ***,to construct a photonic neural population(PNP),the process of scaling up and massive interconnections remain challenging considering the physical complexity and response ***,we propose a comb-based PNP interconnected by carrier coupling with superior *** unique properties of neural population are theoretically and experimentally demonstrated in the comb-based PNP,including nonlinear response curves and population activities coding.A classification task of three input patterns with dual radio-frequency(RF) tones is successfully implemented in a time-efficient manner,which allows the comb-based PNP to make effective use of the ultra-broad bandwidth of photonics for parallel and nonlinear processing.

关键词： nonlinear scaling neural

Sea-urchin-like ReS_(2) nanosheets with charge edge-collection effect as a novel cocatalyst for high-efficiency photocatalytic H_(2) evolution

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Chinese Chemical Letters 2022年第2期33卷 943-947页

作者： Bo Lin bowen ma Jiangang Chen Yao Zhou Jiadong Zhou Xiaoqing Yan Chao Xue Xiao Luo Qing Liu Jinyong Wang Renji Bian Guidong Yang Fucai Liu School of Optoelectronic Science and Engineering University of Electronic Science and Technology of ChinaChengdu 611731China School of Physical and mathematical Sciences Nanyang Technological UniversitySingapore 637371Singapore Key Lab of Advanced Optoelectronic Quantum Architecture and Measurement(Ministry of Education) Beijing Key Lab of Nanophotonics&Ultraﬁne Optoelectronic Systemsand School of PhysicsBeijing Institute of TechnologyBeijing 100081China XJTU-Oxford International Joint Laboratory for Catalysis School of Chemical Engineering and TechnologyXi’an Jiaotong UniversityXi’an 710049China State Centre for International Cooperation on Designer Low-carbon and Environmental materials(CDLCEM) School of Materials Science and EngineeringZhengzhou UniversityZhengzhou 450001China

The recombination of charge carriers arriving from the random charge movement in semiconductor pho-tocatalysts greatly limits the practical application of solar-driven H_(2)*** design of photo-catalytic systems with spatially oriented charge-transfer is a promising route to achieve high charge-separation efficiency for ***,novel sea-urchin-like Re S_(2)nanosheet/TiO_(2)nanoparticle heterojunctions(SURTHs)are *** unique sea-urchin-like structure endows the ReS_(2)cocat-alyst with an unusual charge edge-collection effect,which leads to a significant acceleration of charge separation and transfer,as evidenced by the well-designed selective photodeposition of Pt quantum dots in *** markedly improved charge transfer capacity contributes to a high photocatalytic H_(2)evo-lution rate of 3.71 mmol h^(−1)g^(−1)for SURTHs(an apparent quantum efficiency(AQE)of 16.09%),up to 231.9 times by contrast with that of P25 TiO_(2).This work would provide a new platform for designing the high-efficiency cocatalyst/photocatalyst system with excellent charge transfer capacity.

关键词： Sea-urchin-like ReS_(2)nanosheets Charge edge-collection effect 2D planar edges/tips Charge transfer Photocatalytic H_(2)evolution

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中低温煤焦油加氢保护剂积炭实验研究

石油学报（石油加工） 2021年第2期37卷 422-428页

作者：马博文煤炭科学技术研究院有限公司煤化工分院北京100013 煤炭资源高效开采与洁净利用国家重点实验室北京100013

对中低温煤焦油加氢反应后保护剂进行正庚烷索氏萃取,脱除保护剂表面吸附的烃类物质。采用碳硫元素分析仪和扫描电子显微镜-能谱分析仪(SEM-EDS)分别测定了保护剂碳含量沿反应器轴向分布及碳含量沿保护剂颗粒径向分布;采用低温物理吸附... 详细信息

对中低温煤焦油加氢反应后保护剂进行正庚烷索氏萃取,脱除保护剂表面吸附的烃类物质。采用碳硫元素分析仪和扫描电子显微镜-能谱分析仪(SEM-EDS)分别测定了保护剂碳含量沿反应器轴向分布及碳含量沿保护剂颗粒径向分布;采用低温物理吸附仪(BET)研究了加氢反应前后保护剂的孔结构变化;采用热重-质谱分析仪(TG-MS)研究了加氢反应中保护剂积炭的热解行为。结果表明:沿反应器物流方向,1#保护剂几乎未发生积炭,3#保护剂积炭最多,2#保护剂积炭量高于4#保护剂;保护剂的硫含量整体呈上升趋势,3#保护剂由于积炭严重,其硫含量较低。保护剂上积炭在保护剂颗粒中分布较为均匀,积炭和金属沉积导致保护剂的比表面积和孔体积下降明显,但还有大量未被利用的比表面积和孔道。保护剂积炭的热解温度主要集中在250~500℃之间,沿反应器物流方向积炭的热解温度升高。

关键词：煤焦油加氢保护剂积炭