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Observation of spectral lines in the exceptional GRB 221009A

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Science china(physics,Mechanics & Astronomy) 2024年第8期67卷 187-206页

作者： Yan-Qiu Zhang Shao-Lin Xiong Ji-Rong mao Shuang-Nan Zhang wang-Chen Xue Chao Zheng Jia-Cong Liu Zhen Zhang Xi-lu wang Ming-Yu Ge Shu-Xu Yi Li-Ming Song Zheng-Hua An Ce Cai Xin-Qiao Li Wen-Xi Peng Wen-Jun Tan Chen-Wei wang Xiang-Yang Wen Yue wang Shuo Xiao Fan Zhang Peng Zhang Shi-Jie Zheng Key Laboratory of Particle Astrophysics Institute of High Energy PhysicsChinese Academy of SciencesBeijing 100049China university of Chinese Academy of Sciences Beijing 100049China Yunnan Observatories Chinese Academy of SciencesKunming 650011China Center for Astronomical Mega-Science Chinese Academy of SciencesBeijing 100012China Key Laboratory for the Structure and Evolution of Celestial Objects Chinese Academy of SciencesKunming 650216China college of physics and Hebei Key Laboratory of Photophysics Research and Application Hebei Normal UniversityShijiazhuang 050024China Guizhou Provincial Key Laboratory of Radio Astronomy and Data Processing Guizhou Normal UniversityGuiyang 550001China college of Electronic and information engineering Tongji UniversityShanghai 201804China

As the brightest gamma-ray burst ever observed,GRB 221009A provided a precious opportunity to explore spectral line *** this article,we performed a comprehensive spectroscopy analysis of GRB 221009A jointly with GECAM-C and Fermi/GBM data to search for emission and absorption *** the first time we investigated the line feature throughout this GRB including the most bright part where many instruments suffered problems,and identified prominent emission lines in multiple time *** central energy of the Gaussian emission line evolves from about 37 to 6 MeV,with a nearly constant ratio(about 10%)between the line width and central ***,we find that both the central energy and the energy flux of the emission line evolve with time as a power law decay with power law index of–1 and–2,*** suggest that the observed emission lines most likely origin from the blue-shifted electron positron pair annihilation 511 ke V *** find that a standard high latitude emission scenario cannot fully interpret the observation,thus we propose that the emission line comes from some dense clumps with electron positron pairs traveling together with the *** this scenario,we can use the emission line to directly,for the first time,measure the bulk Lorentz factor of the jet(Γ)and reveal its time evolution(i.e.,Γ~t^(-1))during the prompt ***,we find that the flux of the annihilation line in the co-moving frame keeps *** discoveries of the spectral line features shed new and important lights on the physics of GRB and relativistic jet.

关键词： GRB GRB 221009A emission line

Internet Multimedia Traffic Classification from QoS Perspective Using Semi-Supervised Dictionary Learning Models

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china Communications 2017年第10期14卷 202-218页

作者： Zaijian wang Yuning Dong Shiwen mao Xinheng wang college of physics and Electronic information Anhui Normal University Wuhu 241000 China college of Communications and information engineering Nanjing University of Posts and Telecommunications Nanjing 210003 China Department of Electrical and Computer engineering Auburn University Auburn AL 36849-5201 USA School of Computing University of the West of Scotland Paisley PA 1 2BE UK

To address the issue of finegrained classification of Internet multimedia traffic from a Quality of Service(QoS) perspective with a suitable granularity, this paper defines a new set of QoS classes and presents a modified K-Singular Value Decomposition(K-SVD) method for multimedia identification. After analyzing several instances of typical Internet multimedia traffic captured in a campus network, this paper defines a new set of QoS classes according to the difference in downstream/upstream rates and proposes a modified K-SVD method that can automatically search for underlying structural patterns in the QoS characteristic space. We define bagQoS-words as the set of specific QoS local patterns, which can be expressed by core QoS characteristics. After the dictionary is constructed with an excess quantity of bag-QoSwords, Locality Constrained Feature Coding(LCFC) features of QoS classes are extracted. By associating a set of characteristics with a percentage of error, an objective function is formulated. In accordance with the modified K-SVD, Internet multimedia traffic can be classified into a corresponding QoS class with a linear Support Vector Machines(SVM) clas-sifier. Our experimental results demonstrate the feasibility of the proposed classification method.

关键词： dictionary learning traffic classication multimedia traffic K-singular value decomposition quality of service

Electronic Structures of InGaN_(2) Nanotubes

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Chinese physics Letters 2012年第10期29卷 178-181页

作者： YANG mao SHI Jun-Jie MEI Wei-Ning wang lu ZHANG Min State Key Laboratory for Mesoscopic physics and Department of PhysicsPeking UniversityBeijing 100871 Department of physics University of Nebraska at OmahaOmahaNebraska 68182-0266USA college of physics and Electron information Inner Mongolia Normal UniversityHohhot 010022

We investigate the electronic structures of InGaN_(2) nanotubes(NTs)using first-principles *** is found that all four types of InGaN_(2) NTs,with the same diameter,have similar *** total energy of the per unit InGaN_(2) NT depends on its diameter due to the curvature *** zigzag(armchair)InGaN_(2) NTs have direct(indirect)band *** band gap increases for all of the InGaN_(2) NTs when their diameters *** valence band maximum(VBM)states of the InGaN_(2) NTs are p-like states localised around N *** p-like VBM states in zigzag(armchair)InGaN_(2) NTs are perpendicular(parallel)to the tube axis.

关键词： stability effect zigzag

A Survey of Multimedia Big Data

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china Communications 2018年第1期15卷 155-176页

作者： Zaijian wang Shiwen mao Lingyun Yang Pingping Tang The college of physics and Electronic information Anhui Normal University Department of Electrical and Computer engineering Auburn University

Multimedia big data brings tremendous challenges as well as opportunities for multimedia applications/services. In this paper, we present a survey and tutorial for multimedia big data. After discussing the characteristics of multimedia big data such as human-centricity, multimodality, heterogeneity, unprecedented volume, and so on, this paper provides an overview of the state-of-the-art of multimedia big data, reviews the latest related technologies, and discusses the technical challenges. We conclude this paper with a discussion of open problems and future directions.

关键词： Multimedia big data human-cen-tricity heterogeneity machine learning mul-timodality

Scheme for Teleportation of Four-Level Atomic States in Thermal Cavities

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Communications in Theoretical physics 2007年第6期47卷 1033-1036页

作者： wang Xin-Wen LIU Xiang FANG mao-Fa Department of Electronic engineering and physics Hunan University of Science and Engineering Yongzhou 425100 China college of physics and information Science Hunan Normal University Changsha 410081 China

We propose a scheme for teleportation of four-level atomic states in thermal cavities. The scheme does not involve the generalized Bell-state or generalized GHZ-state measurement, which is difficult in practice. Another feature of the scheme is that it does not require individual addressing of atoms in cavity and is insensitive to both cavity decay and thermal field, which is of importance in point of experiment.

关键词： four-level atomic state multi-atom four-level entangled state teleportation single-atom measurement

Enhanced Synchronization of Intercellular Calcium Oscillations by Noise Contaminated Signals

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Communications in Theoretical physics 2008年第10期50卷 903-906页

作者： ZHANG Ji-Qian CHEN Han-Shuang wang mao-Sheng college of physics and Electronic information Anhui Normal University Wuhu 241000 China

We consider the dynamics of locally coupled calcium oscillation systems,each cell is subjected to extracel-lular contaminated signal,which contains common sub-threshold signal and independent Gaussian *** is found thatintermediate noise can enhance synchronized oscillations of calcium ions,where the frequency of noise-induced oscilla-tions is matched with the one of sub-threshold external *** show that synchronization is enhanced as a result ofthe entrainment of external signal Furthermore,the effect of coupling strength is *** find above-mentionedphenomenon exists only when coupling strength is very *** findings may exhibit that noise can enhance thedetection of feeble external signal through the mechanism of synchronization of intercellular calcium ions.

关键词： synchronization noise coupled oscillators random processes

Scheme for Implementation of Quantum Game in Cavity QED

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Communications in Theoretical physics 2008年第1期49卷 100-102页

作者： CAO Shu-Ai FANG mao-Fa ZHENG Xiao-Juan wang Xin-Wen LI Ze-Hua college of Science South China Agricultural University Guangzhou 510642 China college of physics and information Science Hunan Normal University Changsha 410081 China School of Physical Science and Technology Central South University Changsha 410083 China Department of physics Hunan University of Science and Engineering Yongzhou 425100 China

We propose an experimentally feasible scheme to implement two-player quantum game in cavity quantum electrodynamics （QED）. During the process, the cavity is only virtually excited, thus our scheme is insensitive to ... 详细信息

关键词： entanglement quantum game cavity QED

Defect evolution in GaN thin film heterogeneously integrated with CMOS-compatible Si(100) substrate by ion-cutting technology

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Science china(information Sciences) 2023年第11期66卷 313-314页

作者： Hangning SHI Ailun YI Jiaxin DING Xudong LIU Qingcheng QIN Juemin YI Junjie HU Miao wang Demin CAI Jianfeng wang Ke XU Fengwen MU Tadatomo SUGA René HELLER mao wang Shengqiang ZHOU Wenhui XU Kai HUANG Tiangui YOU Xin OU State Key Laboratory of Functional Materials for Informatics Shanghai Institute of Microsystem and Information Technology Chinese Academy of Sciences university of Chinese Academy of Sciences School of Materials and Chemistry University of Shanghai for Science and Technology Suzhou Institute of Nano-Tech and Nano-Bionics Chinese Academy of Sciences Suzhou Nanowin Science and Technology Co. Ltd. SABers Co. Ltd. Collaborative Research Center Meisei University Helmholtz-Zentrum Dresden-Rossendorf Institute of Ion Beam Physics and Materials Research college of physics and Electronic engineering Sichuan Normal University

Ion-cutting technology is an ingenious solution to the highquality heterogeneous integration of Ga N thin films with CMOS-compatible Si(100) substrate, which provides a platform to combine Ga N-based optoelectronics, high-frequency and high-power electronics with digital signal processing,logic computation, and control of Si(100) CMOS [1].

关键词： Gallium nitride

Nucleic acids analysis

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Science china Chemistry 2021年第2期64卷 171-203页

作者： Yongxi Zhao Xiaolei Zuo Qian Li Feng Chen Yan-Ru Chen Jinqi Deng Da Han Changlong Hao Fujian Huang Yanyi Huang Guoliang Ke Hua Kuang Fan Li Jiang Li Min Li Na Li Zhenyu Lin Dingbin Liu Juewen Liu Libing Liu Xiaoguo Liu Chunhua lu Fang luo Xiuhai mao Jiashu Sun Bo Tang Fei wang Jianbin wang Lihua wang Shu wang Lingling Wu Zai-Sheng Wu Fan Xia Chuanlai Xu Yang Yang Bi-Feng Yuan Quan Yuan Chao Zhang Zhi Zhu Chaoyong Yang Xiao-Bing Zhang Huanghao Yang Weihong Tan Chunhai Fan Institute of Analytical Chemistry and Instrument for Life Science The Key Laboratory of Biomedical Information Engineering of Ministry of EducationSchool of Life Science and TechnologyXi’an Jiaotong UniversityXi’an 710049China Institute of Molecular Medicine Shanghai Key Laboratory for Nucleic Acid Chemistry and NanomedicineRenji HospitalSchool of MedicineShanghai Jiao Tong UniversityShanghai 200127China School of Chemistry and Chemical engineering Frontiers Science Center for Transformative MoleculesInstitute of Translational MedicineShanghai Jiao Tong UniversityShanghai 200240China Cancer Metastasis Alert and Prevention Center Fujian Provincial Key Laboratory of Cancer Metastasis Chemoprevention and ChemotherapyState Key Laboratory of Photocatalysis on Energy and EnvironmentCollege of ChemistryFuzhou UniversityFuzhou 350108China CAS Key Laboratory of Standardization and Measurement for Nanotechnology CAS Center for Excellence in NanoscienceNational Center for Nanoscience and TechnologyBeijing 100190China State Key Lab of Food Science and Technology International Joint Research Laboratory for Biointerface and BiodetectionSchool of Food Science and TechnologyJiangnan UniversityWuxi 214122China Faculty of Materials Science and Chemistry Engineering Research Center of Nano-Geomaterials of Ministry of EducationChina University of GeosciencesWuhan 430074China college of Chemistry and Molecular engineering Biomedical Pioneering Innovation Center(BIOPIC)Beijing Advanced Innovation Center for Genomics(ICG)Peking-Tsinghua Center for Life SciencesPeking UniversityBeijing 100871China State Key Laboratory of Chemo/Biosensing and Chemometrics College of Chemistry and Chemical EngineeringHunan UniversityChangsha 410082China Division of Physical Biology CAS Key Laboratory of Interfacial Physics and TechnologyShanghai Institute of Applied PhysicsChinese Academy of SciencesShanghai 201800China Bioimaging Center Shanghai Synchrotron Radiation FacilityZhangjiang LaboratoryShanghai Advanced

Nucleic acids are natural biopolymers of nucleotides that store, encode, transmit and express genetic information, which play central roles in diverse cellular events and diseases in living things. The analysis of nucleic acids and nucleic acids-based analysis have been widely applied in biological studies, clinical diagnosis, environmental analysis, food safety and forensic *** the past decades, the field of nucleic acids analysis has been rapidly advancing with many technological *** this review, we focus on the methods developed for analyzing nucleic acids, nucleic acids-based analysis, device for nucleic acids analysis, and applications of nucleic acids analysis. The representative strategies for the development of new nucleic acids analysis in this field are summarized, and key advantages and possible limitations are discussed. Finally, a brief perspective on existing challenges and further research development is provided.

关键词： nucleic acids analysis signal amplification DNA nanotechnology aptamer biosensing