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Effects of Defocus Distance on Three-Beam Laser Internal Coaxial Wire Cladding

Chinese Journal of Mechanical Engineering 2021年第4期34卷 56-77页

作者： Shaoshan Ji Fan Liu tuo shi Geyan Fu shihong shi School of Mechanical and Electrical Engineering Soochow UniversitySuzhou 215000China School of Optoelectronic Science and Engineering Soochow UniversitySuzhou 215000China.

Three-beam laser internal coaxial wire feeding cladding is regarded as a promising additive manufacturing technique because it is highly efficient and *** this study,the effects of the defocus distance on cladding using a three-beam laser with internal wire feeding are experimentally and numerically studied.A process map indicating the surface characteristics at different defocus distances with various parameter combinations was *** transmission characteristics including laser intensity,beam size,and laser spot distance of the three-beam laser at different defocus distances were analyzed using TracePro *** on the TracePro results as heat source,a three-dimensional transient finite element(FE)thermal model was formulated to predict the thermal field,temperature history and molten pool shape at different defocus distances.A molten pool with a flat bottom and low melting depth is generated when the defocus distance is−2.5 mm,whereas when this distance is−1.5 mm,a pool with a valley-shaped bond and high melting depth is *** simulated results of the temperature cycle and clad geometry are both validated and found to well agree with experimental *** influence of the defocus distance on the microstructure and microhardness are discussed based on the temperature history and cooling *** the increase in the absolute defocus distance,the height and dilution of the clad decreased,whereas the width *** addition,the effects of defocus distance with various parameter combinations on clad geometry were explored using the formulated FE model.

关键词： Three beams laser Wire cladding Finite element analysis Defocus distance

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TSE-Tran:Prediction method of telecommunication-network fraud crime based on time series representation and transformer

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Journal of Safety Science and Resilience 2023年第4期4卷 340-347页

作者： tuo shi Jie Fu Xiaofeng Hu Department of Public Security Management Beijing Police CollegeBeijing 102202China Environmental Security Defense Brigade Beijing MunicipalPublic Security Bureau Miyun BranchBeijing 101599China School of Information Technology and Cyber Security People’s Public Security University of ChinaBeijing 100038China

Telecom network fraud has become the most common and concerning type of crime and is an important public security incident that threatens urban ***,preventing a continuous rise in telecommunications and network fraud will help establish a resilient urban governance *** the spatiotemporal forecasting of telecommunications-network fraud trends is of significant importance for aiding public security agencies in proactive crime prevention and implementing targeted anti-fraud *** study presents a telecommunication network fraudulent crime prediction method called TSE-Tran,which integrates temporal representation and transformer *** time-series data of telecommunication-network fraud occurrences were input into the TimesNet module,which maps the sequence data to a more precise feature representation tensor that accounts for both intra-and inter-cycle ***,the data are fed into the transformer-encoder module for further encoding,capturing long-range dependencies in the time-series ***,occurrences of future telecommunication network frauds are predicted by a fully connected *** results of the study demonstrate that the proposed TSE-Tran method outperforms benchmark methods in terms of prediction *** results of this study are expected to aid in the prevention and control of telecommunications and network frauds effectively strengthen the resilience of urban development and the ability to respond to public security incidents.

关键词： Urban resilience TimesNet Transformer Time series prediction Attention mechanism

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Comparison of Heat Transfer in Gravity-Driven Granular Flow near Different Surfaces

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Journal of Thermal Science 2021年第2期30卷 441-450页

作者： GUO Zhigang TIAN Xing YANG Jian shi tuo WANG Qiuwang MOE Key Laboratory of Thermo-Fluid Science and Engineering Xi'an Jiaotong UniversityXi'an 710049China

Heat transfer in gravity-driven granular flow has been encountered in many industrial processes,such as waste heat recovery and concentrated solar *** understand more about Moving Bed Heat Exchanger (MBHE) applied in this field,numerical simulation was carried out for the characteristics of granular flow near different surfaces through discrete element method (DEM).In this paper,both the performances of particles motion and heat transfer were ***'s found that,even though the macroscopic granular flow is similar to fluid,there is still obvious discrete nature *** fluctuations of parameters in granular flow are inevitable which is more obvious in the circular tube cases.A special phenomenon,where competition motion is found,is resulted from discrete nature of *** terms of heat transfer,overall heat transfer coefficients for plate are higher than that of tube owing to better contact between particles and ***,due to competition motion,particles in high temperature tend to contact the tube,which is beneficial to heat transfer in some local *** heat transfer characteristics above will also affect the temperature distribution near the outlet of different geometries.

关键词： gravity-driven granular flow discrete element method(DEM) heat transfer numerical simulation

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Impact of Ta/Ti electrodes on linearities of TaOx-based resistive random-access memories for neuromorphic computing

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Science China(Physics,Mechanics & Astronomy) 2020年第9期63卷 83-88页

作者： YiLin Fang tuo shi XuMeng Zhang ZuHeng Wu JunJie An JinSong Wei Jian Lu Qi Liu School of Information Science and Technology University of Science and Technology of ChinaHefei 230027China Key Laboratory of Microelectronics Device&Integrated Technology Institute of MicroelectronicsChinese Academy of SciencesBeijing 100029China University of Chinese Academy of Sciences Beijing 100049China Zhejiang Laboratory Hangzhou 311122China

In this work,by incorporating different electrodes(Ta/Ti)onto TaOxdielectric layer,we studied both the conductance reading and conductance updating(long term potentiation and depression)linearities in the two RRAM *** to the composition modulation(CM)mechanism,the Ta-electrode device shows better conductance reading and updating *** RRAM device linearities directly influence the performance of the neural network when the devices are used as *** evaluation of a two-layer neural network considering the conductance reading and updating linearity factors further confirm that both the training and inference accuracies of Ta electrode device are better than those of the Ti electrode *** believe that this work could serve as a powerful reference for engineering synaptic devices with good linearity for neuromorphic computing applications.

关键词： RRAM conductance reading linearity conductance updating linearity neuromorphic computing

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A neuromorphic core based on threshold switching memristor with asynchronous address event representation circuits

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Science China(Information Sciences) 2022年第2期65卷 211-217页

作者： Jinsong WEI Jilin ZHANG Xumeng ZHANG Zuheng WU Rui WANG Jian LU tuo shi Mansun CHAN Qi LIU Hong CHEN School of Microelectronics University of Science and Technology of China Institute of Microelectronics of Chinese Academy of Sciences Zhejiang Lab Department of Microelectronics and Nanoelectronics Tsinghua University Department of Electronic & Computer Engineering The Hong Kong University of Science and Technology

The full memristive network hardware features high density and excellent scalability. However,recent researches on the full memristive network have been limited to a single-layer network, due to the lack of effective and flexible communication between neurons. In this design, we demonstrate a neuromorphic core based on Ag/Si O2/Au threshold switching memristor, which has built-in asynchronous address event representation(AER) circuits to provide flexible communication between neurons. Since temporally sparse spikes are the medium of communication between neurons, the AER circuits are designed to transmit spikes serially which have been encoded with neurons’ addresses before transmission. With the asynchronous circuits design, the AER circuits will detect neurons’ output in real-time. To test the performance of the neuromorphic core, we designed a behavioral simulator for the neuromporphic core to simulate the liquid state machine(LSM) network, which achieves a 100% recognition rate in the free spoken digital dataset. The simulation results show that the neuromorphic core obtains 35 times higher performance than the CPU and111 times higher energy efficiency than the GPU.

关键词： leaky-integration-and-fire (LIF) memristor threshold switching artificial neuron AER circuits asynchronous circuits on-chip communication

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Voltage-control oscillator based on Pt/C/NbO_x/TiN device with highly improved threshold switching performances

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Science China(Physics,Mechanics & Astronomy) 2019年第12期62卷 126-129页

作者： Wei Wang ZuHeng Wu tuo shi YongZhou Wang Sen Liu RongRong Cao Hui Xu Qi Liu QingJiang Li College of Electronic Science and Technology National University of Defense TechnologyChangsha 410073China Key Laboratory of Microelectronic Devices&Integrated Technology Institute of MicroelectronicsChinese Academy of SciencesBeijing 100029China

Oscillator is a common key component of electronic *** periodic signal produced by the oscillator is generally required in various applications,such as the electronic system clock,electronic neurons,and the true random number generator system[1-6].Capacitors and inductors are usually utilized to generate periodic waveforms in the traditional oscillator,which greatly reduces integration and cannot be packaged into chips[2].Oscillators based on a memristor have been proposed as a solution to these issues[7-14].The memristor has attracted great attention and has been widely applied in many fields,such as memory,com?puting,security,etc.

关键词： oscillator system electronic

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Memory materials and devices:From concept to application

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InfoMat 2020年第2期2卷 261-290页

作者： Zhenhan Zhang Zongwei Wang tuo shi Chong Bi Feng Rao Yimao Cai Qi Liu Huaqiang Wu Peng Zhou State Key Laboratory of ASIC and System School of MicroelectronicsFudan UniversityShanghaiChina Key Laboratory of Microelectronic Devices and Circuits(MOE) Institute of MicroelectronicsPeking UniversityBeijingChina Key Laboratory of Microelectronic Devices and Integrated Technology Institute of MicroelectronicsChinese Academy of SciencesBeijingChina College of Materials Science and Engineering Shenzhen UniversityShenzhenChina Institute of Microelectronics Tsinghua UniversityBeijingChina

Memory cells have always been an important element of information *** emerging technologies like big data and cloud computing,the scale and complexity of data storage has reached an unprecedented peak with a much higher requirement for memory *** is well known,better data storage is mostly achieved by ***,as the size of the memory device is reduced,a series of problems,such as drain gate-induced leakage,greatly hinder the performance of memory *** meet the increasing demands of information technology,novel and high-performance memory is urgently ***,emerging memory technologies are expected to improve memory performance and drive the information *** review will focus on the progress of several emerging memory technologies,including two-dimensional material-based memories,resistance random access memory(RRAM),magnetic random access memory(MRAM),and phasechange random access memory(PCRAM).Advantages,mechanisms,and applications of these diverse memory technologies will be discussed in this review.

关键词： memory MRAM PCRAM RRAM two-dimensional material

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cDNA-AFLP analysis reveals differential gene expression in incompatible interaction between infected non-heading Chinese cabbage and Hyaloperonospora parasitica

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Horticulture Research 2016年第1期3卷 148-156页

作者： Dong Xiao shi-tuo Liu Yan-Ping Wei Dao-Yun Zhou Xi-Lin Hou Ying Li Chun-Mei Hu Horticulture Department College of HorticultureNanjing Agricultural UniversityNanjing 210095China State Key Laboratory of Crop Genetics&Germplasm Enhancement Ministry of AgricultureNanjing 210095China

Non-heading Chinese cabbage(Brassica rapa ***)is one of the main green leafy vegetables in the world,especially in China,with significant economic *** parasitica is a fungal pathogen responsible for causing downy mildew disease in Chinese cabbage,which greatly affects its *** objective of this study was to identify transcriptionally regulated genes during incompatible interactions between non-heading Chinese cabbage and *** using complementary DNA-amplified fragment length polymorphism(cDNA-AFLP).We obtained 129 reliable differential transcript-derived fragments(TDFs)in a resistant line‘Suzhou Qing’.Among them,121 upregulated TDFs displayed an expression peak at 24–48 h post inoculation(h.p.i.).Fifteen genes were further selected for validation of cDNA-AFLP expression patterns using quantitative reverse transcription *** confirmed the altered expression patterns of 13 genes(86.7%)revealed by the *** identified four TDFs related to fungal resistance among the 15 ***,comparative analysis of four TDFs between resistant line‘Suzhou Qing’and susceptible line‘Aijiao Huang’showed that transcript levels of TDF14(BcLIK1_A01)peaked at 48 *** 25.1-fold increased in the resistant line compared with the susceptible ***,transcript levels of the other three genes,TDF42(BcCAT3_A07),TDF75(BcAAE3_A06)and TDF88(BcAMT2_A05)peaked at 24,48 and 24 *** 25.1-,100-and 15.8-fold increases,*** results suggested that the resistance genes tended to transcribe at higher levels in the resistance line than in the susceptible line,which may provide resistance against pathogen *** present study might facilitate elucidating the molecular basis of the infection process and identifying candidate genes for resistance improvement of susceptible cultivars.

关键词： heading analysis interaction

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自由曲面等搭接率算法及激光熔覆工艺实现

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中国激光 2020年第4期47卷 115-121页

作者：苏昊石拓石世宏傅戈雁苏州大学机电工程学院江苏苏州215021

曲面激光熔覆由于搭接率变化,易导致熔覆层厚薄不均。提出了一种自由曲面激光熔覆等搭接率熔道的轨迹生成算法。采用深度相机采集曲面的点云数据,确定一条点云束,对其拟合后作为初始熔道轨迹并根据等距离步长法得到加工点集。采用求交... 详细信息

曲面激光熔覆由于搭接率变化,易导致熔覆层厚薄不均。提出了一种自由曲面激光熔覆等搭接率熔道的轨迹生成算法。采用深度相机采集曲面的点云数据,确定一条点云束,对其拟合后作为初始熔道轨迹并根据等距离步长法得到加工点集。采用求交切片法获得垂直熔覆方向的曲面轮廓,在轮廓上搜寻加工点集的等距点。由等距点集拟合出后一道熔覆轨迹,从而保证搭接率相等。重复上述步骤直到轨迹遍历曲面。按加工点的法矢量方向确定熔覆喷头的运动姿态,使喷头轴线始终垂直加工表面。对半球形封头表面进行熔覆实验,结果表明:等间距轨迹规划算法结合喷头的变姿态适配,可获得搭接率一致的曲面熔道;得到的自由曲面激光熔覆层厚度均匀,硬度较高,无明显的道间隆起或凹陷等缺陷。

关键词：激光技术自由曲面激光熔覆搭接率熔覆层

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Reconfigurable memristor based on SrTiO_(3) thin-film for neuromorphic computing

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Frontiers of physics 2023年第6期18卷 211-220页

作者： Xiaobing Yan Xu Han Ziliang Fang Zhen Zhao Zixuan Zhang Jiameng Sun Yiduo Shao Yinxing Zhang Lulu Wang shiqing Sun Zhenqiang Guo Xiaotong Jia Yupeng Zhang Zhiyuan Guan tuo shi Institute of Life Science and Green Development Key Laboratory of Brain-Like Neuromorphic Devices and Systems of Hebei ProvinceCollege of Electron and Information EngineeringHebei UniversityBaoding 071002China Institute of Microelectronics Chinese Academy of SciencesBeijing 100029China

Neuromorphic computing aims to achieve artificial intelligence by mimicking the mechanisms of biological neurons and synapses that make up the human ***,the possibility of using one reconfigurable memristor as both artificial neuron and synapse still requires intensive research in *** this work,Ag/SrTiO_(3)(STO)/Pt memristor with low operating voltage is manufactured and reconfigurable as both neuron and synapse for neuromorphic computing *** modulating the compliance current,two types of resistance switching,volatile and nonvolatile,can be obtained in amorphous STO thin *** is attributed to the manipulation of the Ag conductive ***,through regulating electrical pulses and designing bionic circuits,the neuronal functions of leaky integrate and fire,as well as synaptic biomimicry with spike-timing-dependent plasticity and paired-pulse facilitation neural regulation,are successfully *** study shows that the reconfigurable devices based on STO thin film are promising for the application of neuromorphic computing systems.

关键词： Ag/STO/Pt reconfigurable memristor volatile and nonvolatile coexistence neuron circuit synaptic biomimicry neuromorphic computing

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