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Spin‑controlled topological phase transition in non‑Euclidean space

Frontiers of Optoelectronics 2024年第1期17卷 67-76页

作者： zhuochen du Jinze Gao Qiuchen Yan Cuicui Lu Xiaoyong Hu Qihuang Gong State Key Laboratory for Mesoscopic Physics and Department of Physics Collaborative Innovation Center of Quantum Matter and Frontiers Science Center for Nano‑OptoelectronicsBeijing Academy of Quantum Information SciencesPeking UniversityBeijing 100871China Key Laboratory of Advanced Optoelectronic Quantum Architecture and Measurements of Ministry of Education Beijing Key Laboratory of Nanophotonics and Ultrafine Optoelectronic SystemsSchool of PhysicsBeijing Institute of TechnologyBeijing 100081China Peking University Yangtze Delta Institute of Optoelectronics Nantong 226010China Collaborative Innovation Center of Extreme Optics Shanxi UniversityTaiyuan 030006China Hefei National Laboratory Hefei 230088China

Modulation of topological phase transition has been pursued by researchers in both condensed matter and optics research fields,and has been realized in Euclidean systems,such as topological photonic crystals,topological metamaterials,and coupled resonator ***,the spin-controlled topological phase transition in non-Euclidean space has not yet been ***,we propose a non-Euclidean configuration based on Mobius rings,and we demonstrate the spin-controlled transition between the topological edge state and the bulk *** Mobius ring,which is designed to have an 8πperiod,has a square cross section at the twist beginning and the length/width evolves adiabatically along the loop,accompanied by conversion from transverse electric to transverse magnetic modes resulting from the spin-locked *** 8πperiod Mobius rings are used to construct Su–Schrieffer–Heeger configuration,and the configuration can support the topological edge states excited by circularly polarized light,and meanwhile a transition from the topological edge state to the bulk state can be realized by controlling circular *** addition,the spin-controlled topological phase transition in non-Euclidean space is feasible for both Hermitian and non-Hermitian cases in 2D *** work provides a new degree of polarization to control topological photonic states based on the spin of Mobius rings and opens a way to tune the topological phase in non-Euclidean space.

关键词： Topological phase transition Non-Euclidean space Möbius ring Spin-locked effect

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High performance integrated photonic circuit based on inverse design method

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Opto-Electronic Advances 2022年第10期5卷 22-34页

作者： Huixin Qi zhuochen du Xiaoyong Hu Jiayu Yang Saisai Chu Qihuang Gong State Key Laboratory for Mesoscopic Physics&Department of Physics Collaborative Innovation Center of Quantum Matter&Frontiers Science Center for Nano-optoelectronicsBeijing Academy of Quantum Information SciencesPeking UniversityBeijing 100871China Peking University Yangtze Delta Institute of Optoelectronics Nantong 226010China Collaborative Innovation Center of Extreme Optics Shanxi UniversityTaiyuan 030006China

The basic indexes of all-optical integrated photonic circuits include high-density integration,ultrafast response and ultralow energy *** methods mainly adopt conventional micro/*** overall size of the circuit is large,usually reaches hundreds of ***,it is difficult to balance the ultrafast response and ultra-low energy consumption problem,and the crosstalk between two traditional devices is difficult to ***,we propose and experimentally demonstrate an approach based on inverse design method to realize a high-density,ultrafast and ultra-low energy consumption integrated photonic circuit with two all-optical switches controlling the input states of an all-optical XOR logic *** feature size of the whole circuit is only 2.5μm×7μm,and that of a single device is 2μm×2μ*** distance between two adjacent devices is as small as 1.5μm,within wavelength magnitude *** response time of the circuit is 150 fs,and the threshold energy is within 10 fJ/*** have also considered the crosstalk *** circuit also realizes a function of identifying two-digit logic signal *** work provides a new idea for the design of ultrafast,ultra-low energy consumption all-optical devices and the implementation of high-density photonic integrated circuits.

关键词： all-optical integrated photonic circuit inverse design all-optical switch all-optical XOR logic gate

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AI大模型下的智能计算技术选型研究

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数字通信世界 2024年第12期 105-107页

作者：杜卓宸西安电子科技大学陕西西安710126

智能计算中心是大模型场景下为AI技术应用提供公共算力服务的重要基础设施,承载着集中推理、模型训练等业务,而智能计算技术选型是影响算力性能的主要因素。在AI大模型应用场景下,传统的GPU配置已经无法满足AI领域对于公共算力以及带宽... 详细信息

智能计算中心是大模型场景下为AI技术应用提供公共算力服务的重要基础设施,承载着集中推理、模型训练等业务,而智能计算技术选型是影响算力性能的主要因素。在AI大模型应用场景下,传统的GPU配置已经无法满足AI领域对于公共算力以及带宽需求,需要优化智能计算技术,推动AI领域发展。基于此,该文对AI大模型下智能计算芯片选型及服务器散热技术选型进行分析,以期为智能计算中心的建设与发展提供参考。

关键词：智能计算技术 AI大模型技术选型

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Unlicensed Spectrum Sharing Game Between LEO Satellites and Terrestrial Cognitive Radio Networks

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Chinese Journal of Aeronautics 2012年第4期25卷 605-614页

作者： XIE zhuochen MA LU LIANG Xuwen Shanghai Engineering Center for Micro-satellites Shanghai 200050China Shanghai Institute of Microsystem and Information Technology Chinese Academy of SciencesShanghai 200050China Graduate University of Chinese Academy of Sciences Beijing 100049China

By cognitive radio,the low Earth orbit（LEO） satellites may prefer to operate in the unlicensed spectrum which is open to all the users,and compete for the limited resources with terrestrial cognitive radio networks（CRNs）.The competition can be regarded as a game and analyzed with game *** particular unlicensed spectrum sharing problem is modeled here,and the special properties of ＂spatially-distinguished-interference＂ and the short period of the interactions between satellites and terrestrial CRNs are ***,the problem is formulated as a ＂partially-blind＂ finitely repeated prisoner＇s dilemma by game ***,we begin with two promising spectrum sharing schemes,which can be used to enforce the frequency reuse among the remotely located terrestrial CRN players as well as to overcome the observation *** analysis and comparison,it is proposed that the novel refreshing-contrite-tit-for-tat（R-CTFT） is the optimal spectrum sharing *** results verify that it can be used to utilize the spectrum most efficiently.

关键词： satellite communication systems cognitive radio unlicensed spectrum sharing spatially-distinguished-interference finitely repeated prisoner's dilemma partially-blind refreshing-contrite-tit-for-tat

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A Bayesian belief-rule-based inference multivariate alarm system for nonlinear time-varying processes

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Science China(Information Sciences) 2021年第10期64卷 194-205页

作者： Xiaobin XU zhuochen YU Jiusun ZENG Wanqi XIONG Yanzhu HU Guodong WANG School of Automation Hangzhou Dianzi University College of Metrology and Measurement Engineering China Jiliang University College of Engineering Peking University School of Automation Beijing University of Posts and Telecommunications Institute of Computer Engineering Vienna University of Technology

This study considers the multivariate alarm design problem of nonlinear time-varying systems by a Bayesian belief-rule-based(BRB) method. In the method, the series of belief rules are constructed to approximate the relationship between input and output variables. Hence, the method does not require an explicit model structure and is suitable for capturing nonlinear causal relationships between *** the purpose of online application, this study further introduces sequential Monte Carlo(SMC) sampling to update the BRB model parameters, which is a fast and efficient method for approximately inferring nonlinear sequence models. Using the model parameters obtained by SMC sampling, the series of output variable tracking errors can be estimated and employed for multivariate alarm design. The case study of a condensate pump verifies the effectiveness of the proposed method.

关键词： multivariate alarm design belief-rule-based method nonlinear time-varying process sequential Monte Carlo

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Quantitative Evaluation of Pseudo Strain Signals Caused by Yarn Structural Deformation

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Advanced Fiber Materials 2022年第2期4卷 214-225页

作者： Shihui Lin Leitao Cao zhuochen Lv Jing Ren Shengjie Ling School of Physical Science and Technology ShanghaiTech University393 Middle Huaxia RoadShanghai 201210China

Yarn-based strain sensors(YSSs)have shown great promising in the fabrication of wearable devices for their good comfortability and fexible ***,the false signals generated by the changes in the yarn structure of the YSSs are usually *** this study,the generation,the characteristic,and the prediction of these signals were *** recognized that these signals are composed of two negative pseudo peaks and a spurious resistance response *** responses are found to have nothing in common with a true tensile strain,but be attributed to plastic deformation of the *** is due to the fact that the deformation of YSSs exceeds the linear elastic range of the *** the use of pure elastic fbers can eliminate the spurious resistance response plateau,it will lead to an increase in the pseudo peak to the value compared with a true strain signal ***,a theoretical model was established to decouple the real signals from the false responses,ensuring the high sensing accuracy of YSSs for applications in wearable devices and artifcial intelligence *** work provides an in-depth understanding of the response of the YSSs,which might provide inspiration and guidance in the design of high-accuracy fber-based strain sensors.

关键词： Textile strain sensor Pseudo-signal Structure-property relationship Contact resistance

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Reconstructing Environmental Changes of a Coastal Lagoon with Coral Reefs in Southeastern Hainan Island

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Chinese Geographical Science 2017年第3期27卷 402-414页

作者： ZHOU Liang GAO Shu GAO Jianhua ZHAO Yangyang HAN zhuochen YANG Yang JIA Peihong Collaborative Innovation Center of South China Sea Studies Nanjing University Nanjing 210023 China Ministry of Education Key Laboratory for Coast and lsland Development Nanjing University Nanjing 210023 China State Key Laboratory of Estuarine and Coastal Research East China Normal University Shanghai 200046 China

Coastal lagoons with small catchment basins are highly sensitive to natural processes and anthropogenic activities. To figure out the environmental changes of a coastal lagoon and its contribution to carbon burial, two sediment cores were collected in Xincun Lagoon, southeastern Hainan Island and (210) ~Pb activities, grain size parameters, total organic carbon(TOC), total nitrogen(TN), total inorganic carbon(TIC) and stable carbon isotopes(δ^(13)C) were measured. The results show that in 1770–1815, the decreasing water exchange capacity with outer open water, probably caused by the shifting and narrowing of the tidal inlet, not only diminished the currents and fined the sediments in the lagoon, but also reduced the organic matter of marine sources. From 1815 to 1950, the sedimentary environment of Xincun Lagoon was frequently influenced by storm events. These extreme events resulted in the high fluctuation of sediment grain size and sorting, as well as the great variation in contributions of terrestrial(higher plants, soils) and marine sources(phytoplankton, algae, seagrass). The extremely high content of TIC, compared to TOC before 1950 could be attributed to the large-scale coverage of coral reefs. However, with the boost of seawater aquaculture activities after 1970, the health growth of coral species was severely threatened, and corresponding production and inorganic carbon burial flux reduced. The apparent enhanced inorganic carbon burial rate after 1990 might result from the concomitant carbonate debris produced by seawater aquaculture. This result is important for local government long-term coastal management and environmental planning.

关键词： environmental change carbon burial flux organic matter coral reef human activity coastal lagoon southeastern Hainan Island

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Silk Fibroin Nacre

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Advanced Fiber Materials 2022年第5期4卷 1191-1208页

作者： Chenxi Zhao Yawen Liu zhuochen Lv Leitao Cao Jing Ren Zhengzhong Shao Shengjie Ling School of Physical Science and Technology ShanghaiTech University393 Middle Huaxia RoadShanghai 201210China State Key Laboratory of Molecular Engineering of Polymers Department of Macromolecular ScienceLaboratory of Advanced MaterialsFudan UniversityShanghai 200433China

Producing lightweight,mechanically strong,ductile,and biocompatible materials remains a significant challenge in material engineering due to the conflict between structural and mechanical *** by the“brick-and-mortar”structure of nacre,a construction with a naturally optimized structure-performance-function relationship,this study developed silk fibroin(SF)nacre as a silk protein-based nacre by integrating ice-templating and thermoplastic molding *** nacres are similar to natural nacre in microstructure,and their strength and toughness are even superior to natural *** mechani-cal properties permit machining by extreme processing techniques,such as ion beam ***,SF nacre can be used to modulate the polarization of laser beams and generate bright structural ***,mechanical robustness,good processability,and tunable coloration allow SF nacres to be used as a plastic replacement for structural engineering and biomedical use,showing promising advancement of such implantable devices towards clinical translation.

关键词： Silk fibroin Nacre Mechanical properties Optical modulation

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Facile synthesis of bimetallic N-doped carbon hybrid material for electrochemical nitrogen reduction

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Journal of Energy Chemistry 2021年第8期30卷 715-720,I0015页

作者： Linchuan Cong Kaida Yao Siqi Zhang Ziqi Zhang zhuochen Yu Miaomiao Qian Lina Qu Weimin Huang College of Chemistry Jilin UniversityChangchun 130012China Key Laboratory of Physics and Technology for Advanced Batteries of Ministry of Education Jilin UniversityChangchun 130012China

due to the increasingly depleted limited fossil fuel resources,the development of renewable energy is the key to promote sustainable development which is an important part of the energy strategy[1].NH3 is one of most important and largest chemical productions in the world,it can be used as a feedstock for nitrogen fertilizer productions[2,3]or as a carbon-free energy carrier[4,5].

关键词： Electrocatalysis NH_(3) synthesis Co and Ru bimetal Nitrogen-doped carbon layer Ambient conditions

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Typhoon events recorded in coastal lagoon deposits,southeastern Hainan Island

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Acta Oceanologica Sinica 2017年第4期36卷 37-45页

作者： ZHOU Liang GAO Shu YANG Yang ZHAO Yangyang HAN zhuochen LI Gaocong JIA Peihong YIN Yong ing 210093 China Ministry of Education Key Laboratory for Coast and Island Development Nanjing University Nanjing 210093 China

Coastal lagoon deposits provide evidence for the magnitude and frequency of past tropical cyclones prior to instrumental records and historical *** the present study,we attempt to analyze the sedimentary records containing typhoon information for the northern South China Sea *** this purpose,sediment cores were collected from two coastal lagoons in the southeastern Hainan Island,and were analyzed in laboratory to derive the data sets about grain size,organic and inorganic carbon contents,and deposition *** grain size and organic-inorganic carbon data were used to formulate the proxies of typhoon *** deposition rates,as calculated using the CRS 210 Pb method,are around 0.5 mm/a for both lagoons,on the basis of which an age model is *** the cores,sedimentary layers associated with 35 typhoon events have been *** such a basis,a 350 year history of local typhoon activities is reconstructed by incorporating the 210 Pb dating results,typhoon-induced sedimentation patterns and the historical documents.A comparison of the frequency of typhoon occurrence with the regional climate records indicates that the observed changes in tropical cyclone activity patterns,as revealed by the lagoon sedimentary records,may be related to El Ni？o,Pacific Decadal Oscillation（PDO）,North Atlantic Oscillation（NAO）,sunspot,and other potential climate drivers that affect the tropical cyclone *** study demonstrates that the sedimentary record of storms can be analyzed in combination with historical documents,to provide meaningful information on past storm activities and their long-term variability.

关键词： paleostorms typhoon-induced deposits grain size loss on ignition Hainan Island

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