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Measurement of the neutron total cross section of^(9)Be at the Back-n white neutron source of CSNS

Chinese Physics C 2024年第8期48卷 140-152页

作者： Jiangbo Bai Jingyu Tang Liqun Shi Yonghao Chen Han Yi Jie Bao Yu Bao Ping Cao Haolei Chen Zhen Chen Zengqi Cui Ruirui Fan Changqing Feng Keqing Gao Xiaolong Gao MinHao Gu Changcai Han Guozhu He Yongcheng He Yang Hong Yiwei Hu Hanxiong Huang Xiru Huang Haoyu Jiang Wei Jiang Zhijie Jiang Hantao Jing Ling Kang Bo Li Chao Li Jiawen Li Qiang Li Xiao Li Yang Li Jie liu Shubin liu Ze Long Guangyuan Luan Changjun ning Mengchen Niu Binbin Qi Jie Ren Xichao Ruan Zhaohui Song Kang Sun Zhijia Sun Zhixin Tan Xinyi Tang Binbin tian Lijiao Wang Pengcheng Wang Zhaohui Wang Xiaoguang Wu xuan Wu Likun Xie Xiaoyun Yang Li Yu Tao Yu Yongji Yu Guohui Zhang Linhao Zhang Qiwei Zhang Xianpeng Zhang Yuliang Zhang Zhiyong Zhang Luping Zhou Zhihao Zhou Kejun Zhu Institute of modern Physics Fudan UniversityShanghai 200433China School of Nuclear science and Technology University of Science and Technology of ChinaHefei 230026China Sate key laboratory of Particle Detection and electronics University of Science and Technology of ChinaHefei 230026China Institute of High Energy Physics Chinese Academy of Sciences(CAS)Beijing 100049China Spallation Neutron Source science Center Dongguan 523803China key laboratory of Nuclear Data China Institute of Atomic EnergyBeijing 102413China department of modern Physics University of Science and Technology of ChinaHefei 230026China State key laboratory of Nuclear Physics and Technology School of PhysicsPeking UniversityBeijing 100871China State key laboratory of Particle Detection and electronics Institute of High Energy Physics Chinese Academy of SciencesBeijing 100049China Northwest Institute of Nuclear Technology Xi’an 710024China University of Chinese Academy of sciences Beijing 100049China

The neutron total cross section data of^(9)Be are essential in the nuclear structure model research of light nuclei and nuclear power *** neutron total cross section of^(9)Be in the 0.3 eV−120 MeV energy region has been measured using time-of-flight and transmission methods with the Neutron Total Cross Sectional Spectrometer(NTOX)based on the multi-cell fast fission chamber at the China Spallation Neutron Source(CSNS)-Back-n white neutron source(Back-n).The fission count-neutron energy distributions of ^(235)U and ^(238)U without samples and with Be samples with three thicknesses were measured in the double-bunch operation mode for a beam power of 100 *** Bayesian method was used to eliminate the influence of the double-bunch problem on neutron measurement in the energy region above 10 *** neutron total cross section of^(9)Be results was consistent with ENDF/B-VIII.0 evaluation library data in the 0.3 eV−20 MeV energy *** the energy ranges of 0.3 eV to 10 keV and 0.01 to 20 MeV,the deviations between our results and the evaluation results of ENDF/B-VIII.0 were within 2.5%and 15%,*** the resonance energy region,the measured resonance energies in our experiment were 0.63,0.82,and 2.8 MeV,*** results showed that the total cross section uncertainties of three Be samples were within 2.2%in the energy region below 1 *** total cross section uncertainty of 30 mm Be from ^(235)U was the smallest and less than 5%in the energy region of 0.3 eV−120 *** results of this experiment can provide technical support for further data analysis and related nuclear data evaluation.

关键词： ^(9)Be neutron total cross section CSNS Back-n time-of-flight method transmission method multi-cell fast fission chamber

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Characterization and performance of graphene-PbSe thin film heterojunction

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Rare Metals 2021年第1期40卷 219-224页

作者： Bo He Yi-xuan Ren tian-Jun Dai Shuang Hou Xing-Zhao liu School of electronics science and engineering University of Electronic Science and Technology of ChinaChengdu 611731China State key laboratory of Electronic Thin Films and Integrated Devices Chengdu 611731China

An infrared detector with high responsivity based on graphene-PbSe thin film heterojunction was ***-quality PbSe thin film and graphene were prepared by molecular beam epitaxy and chemical vapor deposition,*** physical characteristics of PbSe thin film and graphene were performed using X-ray diffraction(XRD),X-ray photoelectron spectroscopy(XPS)and Raman *** photo transistor using PbSe thin film as a sensitizer and graphene as a channel to transport excitons exhibits peak responsivity and detectivity up to~420 A·W^(-1) and 5.9×10^(11) Jones(radiation intensity:0.75 mW·cm^(-2))at room temperature in the near-infrared(NIR)region,*** high optical response is attributed to the photo-excited holes transferring from PbSe film to graphene under ***,it is revealed that the responsivity of graphene-PbSe photo transistor is gate-tunable which is important in photodetectors.

关键词： PbSe Graphene Heterojunction Infrared photodetectors

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Soft electronics for Health Monitoring Assisted by Machine Learning

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Nano-Micro Letters 2023年第5期15卷 83-168页

作者： Yancong Qiao Jinan Luo tianrui Cui Haidong liu Hao Tang Yingfen Zeng Chang liu Yuanfang Li Jinming Jian Jingzhi Wu He tian Yi Yang tian-Ling Ren Jianhua Zhou School of Biomedical engineering Shenzhen Campus of Sun Yat-sen UniversityNo.66Gongchang RoadGuangming DistrictShenzhen 518107People’s Republic of China School of Integrated Circuits and Beijing National Research Center for Information science and Technology(BNRist) Tsinghua UniversityBeijing 100084People’s Republic of China key laboratory of Sensing Technology and Biomedical Instruments of Guangdong Province School of Biomedical EngineeringSun Yat-sen UniversityGuangzhou 510275People’s Republic of China

Due to the development of the novel materials,the past two decades have witnessed the rapid advances of soft *** soft electronics have huge potential in the physical sign monitoring and health *** of the important advantages of soft electronics is forming good interface with skin,which can increase the user scale and improve the signal ***,it is easy to build the specific dataset,which is important to improve the performance of machine learning *** the same time,with the assistance of machine learning algorithm,the soft electronics have become more and more intelligent to realize real-time analysis and *** soft electronics and machining learning algorithms complement each other very *** is indubitable that the soft electronics will bring us to a healthier and more intelligent world in the near ***,in this review,we will give a careful introduction about the new soft material,physiological signal detected by soft devices,and the soft devices assisted by machine learning *** soft materials will be discussed such as two-dimensional material,carbon nanotube,nanowire,nanomesh,and ***,soft sensors will be discussed according to the physiological signal types(pulse,respiration,human motion,intraocular pressure,phonation,etc.).After that,the soft electronics assisted by various algorithms will be reviewed,including some classical algorithms and powerful neural network ***,the soft device assisted by neural network will be introduced ***,the outlook,challenge,and conclusion of soft system powered by machine learning algorithm will be discussed.

关键词： Soft electronics Machine learning algorithm Physiological signal monitoring Soft materials

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1.3-μm 4×25-Gb/s hybrid integrated TOSA and ROSA

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Frontiers of Information Technology & Electronic engineering 2019年第4期20卷 490-497页

作者： Yu liu Hao-tian BAO Yi-ming ZHANG Zhi-ke ZHANG Yun-shan ZHANG Xiang-fei CHEN Jun LU Yue-chun SHI Jia-shun ZHANG Liang-liang WANG Jun-ming AN ning-hua ZHU State key laboratory on Integrated Optoelectronics Institute of Semiconductors Chinese Academy of Sciences School of Electronic Electrical and Communication Engineering University of Chinese Academy of Sciences State key laboratory of Advanced Optical Communications System and Networks School of Electronics Engineering and Computer Science Peking University Microwave-Photonics Technology laboratory College of Engineering and Applied Sciences Nanjing University

The design and fabrication of a compact and low-cost 4×25-Gb/s transmitter optical sub-assembly(TOSA) and receiver optical sub-assembly(ROSA) using a hybrid integrated technique are reported. TOSA and ROSA are developed without thermoelectric cooler for coarse wavelength division multiplexing applications. Physical dimension of the packaged optical subassembly is limited to 11.5 mm×5.4 mm×5.4 mm. The design of TOSA and ROSA is employed using a silica-based arrayed waveguide grating chip to select the specific channel wavelength at O-band. In TOSA, the wavelength of four 1.3-μm discrete directly modulated laser chips is well controlled based on the reconstruction equivalent chirp technique. In the back-to-back transmission test, bit error rates for all lanes of cascade of the TOSA and ROSA are small. A clear opening eye diagram is obtained.

关键词： Reconstruction equivalent chirp Arrayed waveguide grating Transmitter optical subassembly Hybrid integrated

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Unveiling the role of Fe_(3)O_(4)in polymer spin valve near Verwey transition

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Nano Research 2021年第1期14卷 304-310页

作者： Shuaishuai Ding Yuan tian Xiang liu Ye Zou Huanli Dong Wenbo Mi Wenping Hu tianjin key laboratory of Molecular Optoelectronic sciences Department of ChemistrySchool of SciencesTianjin UniversityTianjin 300072China tianjin key laboratory of Low Dimensional Materials Physics and Preparation Technology School of ScienceTianjin UniversityTianjin 300354China Beijing National laboratory for Molecular sciences Key Laboratory of Organic SolidsInstitute of ChemistryChinese Academy of SciencesBeijing 100190China School of Physics and electronics Hunan UniversityChangsha 410082China Collaborative Innovation Center of Chemical science and engineering Tianjin 300072China Joint School of National University of Singapore and tianjin University International Campus of Tianjin UniversityBinhai New CityFuzhou 350207China

The spinterface formed between ferromagnetic(FM)electrode and organic materials is vital for performance optimization in organic spin valve(OSV).Half-metallic Fe_(3)O_(4)with drastic change in structure,conductivity and magnetic property near Verwey transition can serve as an intrinsic spinterface ***,such modulating effect of Fe_(3)O_(4)in OSV has not been comprehensively investigated,especially below the Verwey transition temperature(Tv).Here,we highlight the important role of Fe_(3)O_(4)electrode in reliable-working and controllable Fe_(3)O_(4)/P3HT/Co polymer spin valves by investigating the magnetoresistance(MR)above and below *** order to distinguish between different contributions to charge transport and related MR responses,the systematic electronic and magnetic characterizations were carried out in full temperature ***,the first-order metal-insulator transition in Fe_(3)O_(4)has a dramatic effect on the MR enhancement of polymer spin valves at ***,both the conducting mode transformation and MR line shape modulation could be accomplished across *** research renders unique scenario to multimodal storage by external thermodynamic parameters,and further reveals the importance of spin-dependent interfacial modification in polymer spin valves.

关键词： polymer spin valves Fe_(3)O_(4) Verwey transition magnetoresistance

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BERST: An Engine and Tool for Exploring Biomedical Entities and Relationships

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Chinese Journal of electronics 2019年第4期28卷 797-804页

作者： BAI tian GE Yan YANG Changqing liu Xiaohua GONG Leiguang WANG Ye HUANG Lan College of Computer science and Technology Jilin University key laboratory of Symbolic Computation and Knowledge engineering of Ministry of Education Jilin University department of Computer science and Technology Zhuhai College of Jilin University

To facilitate the search of rapidly growing biomedical knowledge in literature, we developed a Biomedical entity-relationship search tool(BERST). It is also a biomedical knowledge integration framework, which presently contains six popular databases represented in terms of a network of concepts and relations extracted from these knowledge sources. Users search the integrated knowledge network by entering keywords, and BERST returns a sub-network matching and representing the keywords and their relationships. The resulting graph can be navigated interactively allowing users to explore specific paths between any two nodes representing potentially interesting relationships between them. A graphical UI was developed to provide a more intuitive and overall view of the information being searched and studied. BERST framework can be naturally expanded to integrate other biomedical knowledge sources. BERST is implemented as a Java web application.

关键词： Biomedical ontology Relationship mining Relationship searching tool

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磁有序CoH_(2)SeO_(4)薄片中的室温铁电性

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science China Materials 2024年第5期67卷 1654-1660页

作者：陈璐秋余冰沈阳刘逸飞王号南冯光迪朱秋香罗卫东刘俊明万建国赵庆彪田博博褚君浩段纯刚 key laboratory of Polar Materials and Devices(MOE) Shanghai Center of Brain-inspired Intelligent Materials and Devicesand Department of ElectronicsEast China Normal UniversityShanghai200241China Zhejiang Lab Hangzhou310000China laboratory of Solid State Microstructures and Innovation Center of Advanced Microstructures Nanjing UniversityNanjing210093China key laboratory of Artificial Structures and Quantum Control School of Physics and AstronomyShanghai Jiao Tong UniversityShanghai200240China School of Chemistry and Environmental engineering Wuhan Institute of TechnologyWuhan430205China State key laboratory of Infrared Physics Shanghai Institute of Technical PhysicsChinese Academy of SciencesShanghai200083China Institute of Optoelectronics Fudan UniversityShanghai200433China Collaborative Innovation Center of Extreme Optics Shanxi UniversityTaiyuan030006China

本文通过第一性原理计算和实验表征证明了二维CoH_(2)SeO_(4)薄膜的磁有序和滑移铁电性.首先,实验结果证实了粉末CoH_(2)SeO_(4)样品的反铁磁序.同时,第一性原理计算表明单层CoH_(2)SeO_(4)具有反铁磁(AFM-I)基态(TN≈75 K),且预测了二... 详细信息

本文通过第一性原理计算和实验表征证明了二维CoH_(2)SeO_(4)薄膜的磁有序和滑移铁电性.首先,实验结果证实了粉末CoH_(2)SeO_(4)样品的反铁磁序.同时,第一性原理计算表明单层CoH_(2)SeO_(4)具有反铁磁(AFM-I)基态(TN≈75 K),且预测了二维CoH_(2)SeO_(4)薄膜具有以不对称的三重势阱态为特征的滑移铁电性,并在实验中测得了180°压电滞回线、可反转铁电畴和二次谐波信号.此外,在基于二维CoH_(2)SeO_(4)薄膜的电容器中获得铁电材料所特有的电滞回线和蝴蝶状的电容曲线.介电温谱测试表明二维CoH_(2)SeO_(4)薄膜的铁电转变温度约为370 ***_(2)SeO_(4)中滑移铁电性和反铁磁性的出现为获得低维多铁材料指出了一条新的途径.

关键词： two-dimensional materials sliding ferroelectricity multiferroic materials

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A Smart Mathematic Morphology Method for Recognition and Understanding of Airfield

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Wuhan University Journal of Natural sciences 2005年第5期10卷 867-872页

作者： WANG Zhi-cheng tian Yan tian Jin-wen liu Jian LIANG Chao-sheng TAO Wen-bin State Education Commission key laboratory for Image Processing and Intelligence Control Huazhong University of Science and Technology Wuhan430074 Hubei China department of electronics and Information engineering Huazhong University of Science and Technology Wuhan 430074 Hubei China Institute for Pattern Recognition and Artificial Intelligence Huazhong University of Science and Technology Wuhan 430074 Hubei China

A method used for recognition and understanding of airfield based on mathematical morphology is proposed in this paper. The new approach can he divided into three steps. First, to extract the typical geometric structure features of airfield, a segmentation method called recursive Otsu algorithm is employed on an airfield image. Second, thinning and shrinking algorithms are utilized to obtain the contour of airfield with single pixel and to remove diffused small particles. Finally, Radon transform is adopted to extract two typical and important components, primary and secondary runways of airfield exactly. At the same time, region growing algorithm is exploited to get the other components such as parking apron and garages. The experimental results demonstrate that the proposed method gives good performance.

关键词： mathematical morphology shrinking algorithm Radon transform Region growing

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Effect of layered-coupling in twisted WSe_(2) moiré superlattices

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Nano Research 2023年第2期16卷 3435-3442页

作者： Biao Wu Haihong Zheng Shaofei Li Chang-tian Wang Junnan Ding Jun He Zongwen liu Jian-Tao Wang Yanping liu School of Physics and electronics Hunan Key Laboratory for Super-microstructure and Ultrafast ProcessCentral South UniversityChangsha 410083China State key laboratory of High-Performance Complex Manufacturing Central South UniversityChangsha 410083China Beijing National laboratory for Condensed Matter Physics Institute of PhysicsChinese Academy of SciencesBeijing 100190China School of Physical sciences University of Chinese Academy of SciencesBeijing 100049China School of Chemical and Biomolecular engineering The University of SydneyNSW 2006Australia The University of Sydney Nano Institute The University of SydneyNSW 2006Australia Songshan Lake Materials laboratory Dongguan 523808China Shenzhen Research Institute of Central South University Shenzhen 518000China

Recently,the discovery of a variety of moiré-related properties in the twisted vertical stacking of two different monolayers has attracted considerable *** introduction of small twist angles in transition metal dichalcogenide(TMD)heterostructures leads to the emergence of moirépotentials,which provide a fascinating platform for the study of strong interactions of *** there has been extensive research on moiréexcitons in twisted bilayer superlattices,the capture and study of moiréexcitons in homostructure superlattices with layer-coupling effects remain ***,we present the observation of moiréexcitons in the twisted 1L-WSe_(2)/1L-WSe_(2)and 1L-WSe_(2)/2L-WSe_(2)homostructures with various layer-coupling *** results reveal that the moirépotential increases(~260%)as the number of underlying layers decreases,indicating the effect of layer coupling on the modulation of the moiré*** effects of the temperature and laser power dependence as well as valley polarization on moiréexcitons were further demonstrated,and the crucial spectral features observed were *** findings pave the way for exploring quantum phenomena and related applications of quantum information.

关键词： twisted homostructures moirésuperlattices moirépotential layer-coupling

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Exploring the regulatory effect of stacked layers on moiréexcitons in twisted WSe_(2)/WSe_(2)/WSe_(2)homotrilayer

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Nano Research 2023年第7期16卷 10573-10579页

作者： Haihong Zheng Biao Wu Chang-tian Wang Shaofei Li Jun He Zongwen liu Jian-Tao Wang Ji-an Duan Yanping liu School of Physics and electronics Hunan Key Laboratory for Super-microstructure and Ultrafast ProcessCentral South University932 South Lushan RoadChangsha 410083China State key laboratory of Precision Manufacturing for Extreme Service Performance Central South University932 South Lushan RoadChangsha 410083China Beijing National laboratory for Condensed Matter Physics Institute of PhysicsChinese Academy of SciencesBeijing 100190China School of Physical sciences University of Chinese Academy of SciencesBeijing 100049China School of Chemical and Biomolecular engineering The University of SydneyNSW 2006Australia The University of Sydney Nano Institute The University of SydneyNSW 2006Australia Songshan Lake Materials laboratory Dongguan 523808China Shenzhen Research Institute of Central South University Shenzhen 518057China

Moirésuperlattices in van der Waals structures have emerged as a powerful platform for studying the novel quantum properties of two-dimensional *** periodic moirépatterns generated by these structures lead to the formation of flat mini-bands,which alter the electronic energy bands of the *** resulting flat electronic bands can greatly enhance strong correlative interactions between electrons,leading to the emergence of exotic quantum phenomena,including moiréphonons and moiré*** extensive research has been conducted on the exotic quantum phenomena in twisted bilayers of transition metal dichalcogenides(TMDs),and the regulatory effect of stacked layers on moiréexcitons remains *** this study,we report the fabrication of a twisted WSe_(2)/WSe_(2)/WSe_(2) homotrilayer with two twist angles and investigate the influence of stacked layers on moiré*** experiments reveal multiple moiréexciton splitting peaks in the twisted trilayer,with moirépotential depths of 78 and 112 meV in the bilayer and trilayer homostructures,*** also observed the splitting of the moiréexcitons at 90 K,indicating the presence of a deeper moirépotential in the twisted ***,we demonstrate that stacked layers can tune the moiréexcitons by manipulating temperature,laser power,and magnetic *** results provide a new physical model for studying moirésuperlattices and their quantum properties,which could potentially pave the way for the development of quantum optoelectronics.

关键词： materials material field

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