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Two-dimensional violet phosphorus as a broadband saturable absorber for mid-infrared photonics

Optics Express 2025年第10期33卷 21328-21338页

作者： Li, Bo Pan, Han Pan, Zhongben Chu, Hongwei Li, Ying Zhao, Shengzhi Li, Dechun School of Information Science and Engineering Shandong Provincial Key Laboratory of Laser Technology and Application Key Laboratory of Laser and Infrared System of Ministry of Education Shandong University Qingdao266237 China Key Laboratory of Colloid and Interface Chemistry of Education Ministry School of Chemistry and Chemical Engineering Shandong University Jinan250100 China

Two-dimensional (2D) violet phosphorus (VP), a recently investigated 2D semiconductor material, is promising for advanced optoelectronic applications because of its distinct physical and chemical features. In this work, high-quality, few-layered, 2D VP nanosheets were prepared, and their nonlinear optical (NLO) absorption characteristics were examined in detail in the 2 and 3 µm bands. The calculated high nonlinear absorption coefficients, low saturation intensities, and high modulation depths of 2D VP nanosheets demonstrated their exceptional mid-infrared (MIR) saturable absorption properties and significant potential for MIR photonic applications. Thus, in the Tm: GdVO4 laser and Er: YAP laser, we employed 2D VP as a broadband saturable absorber (SA), and obtained stable Q-switched pulse outputs with pulse durations of 522.6 ns at 1.9 µm and 195 ns at 2.8 µm, respectively. In particular, the pulse width obtained at 3 µm based on 2D VP-SA is much narrower compared to that obtained for most other 2D materials SAs. These results demonstrate that 2D VP can be a potential candidate for broadband MIR SA. © 2025 Optica Publishing Group under the terms of the Optica Open Access Publishing Agreement.

关键词： Nanosheets

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Sustainable Mining in the Era of Artificial Intelligence

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IEEE/CAA Journal of Automatica Sinica 2024年第1期11卷 1-4页

作者： Long Chen Yuting Xie Yutong Wang Shirong Ge Fei-Yue Wang IEEE the State Key Laboratory for Management and Control of Complex Systems at the Institute of Automation Chinese Academy of SciencesBeijing 100190China the National Laboratory of Pattern Recognition at the Institute of Automation and Waytous Ltd.China the School of Computer Science and Engineering Sun Yat-Sen UniversityGuangzhou 510275GuangdongChina the School of Mechanical Electronic and Information Engineering China University of Mining and Technology BeijingBejing 100083China the School of Artificial Intelligence University of Chinese Academy of SciencesBeijing 100190China

The mining sector historically drove the global economy but at the expense of severe environmental and health repercussions,posing sustainability challenges[1]-[3].Recent advancements on artificial intelligence(AI)are revolutionizing mining through robotic and data-driven innovations[4]-[7].While AI offers mining industry advantages,it is crucial to acknowledge the potential risks associated with its widespread ***-reliance on AI may lead to a loss of human control over mining operations in the future,resulting in unpredictable consequences.

关键词： Sustainable mining consequences

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Mission segment division of the whole aeroengine loading spectrum based on flight actions

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Chinese Journal of Aeronautics 2022年第2期35卷 164-174页

作者： Yu JIN Zhigang SUN Yingdong SONG Xin LIN Xuming NIU Junjie DING Jiangsu Province Key Laboratory of Aerospace Power System College of Energy and Power EngineeringNanjing University of Aeronautics and AstronauticsNanjing 210016China Key Laboratory of Aero-engine Thermal Environment and StructureMinistry of Industry and Information TechnologyNanjing 210016China State Key Laboratory of Mechanics and Control Mechanical Structures Nanjing University of Aeronautics and AstronauticsNanjing 210016China

This paper studies on a division method of the whole aeroengine loading spectrum flight mission segment and rotor speed mission segment,which is based on the actual flight actions and related to the flight operations of aeroengine and is suitable for the variable-speed aeroengines such as turbojet and *** the research,the aeroengine loading spectrum operation-related mission segments can be divided,which can provide important data basis for the life research on the structures which are sensitive to flight maneuver(such as the main shaft,large gearbox and installation section),lay a foundation for the simulation,compilation and prediction of the whole aeroengine loading ***,based on the summary of basic flight actions in actual flight,the division of flight mission segment was realized by ***,the aeroengine rotor speed mission segments,associated with flight actions and missions,were divided based on the flight mission segment division ***,the efficiency and accuracy of the mission segment division results were verified by adopting measured loading spectrum ***,the characteristics of speed mission segment division results were compared and analyzed in tables and *** comparison results show that the characteristics of similar speed mission segments are similar,while the characteristics of different speed mission segments are *** the shapes of similar mission segments vary to the change of flight actions and operations,which can reflect the operation-related feature of the segments.

关键词： Aircraft engine Flight mission segment Mission segment division Rotor speed mission segment Spectrum analysis

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Enhancing thermoelectric performance of n-type AgBi_(3)S_(5)through synergistically optimizing the effective mass and carrier mobility

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Journal of Materiomics 2023年第5期9卷 874-881页

作者： Xin Qian Xiaoxue Zhang Haoran Guo Bangfu Ding Mingjing Chen Jiang-Long Wang Li-Dong Zhao Shu-Fang Wang Key Laboratory of High-precision Computation and Application of Quantum Field Theory of Hebei Province College of Physics Science and TechnologyHebei UniversityBaoding071002China College of Quality and Technical Supervision Hebei UniversityBaoding071002China Key Laboratory of Brain-like Neuromorphic Devices and Systems of Hebei Province College of Electron and Information EngineeringHebei UniversityBaoding071002China School of Materials Science and Engineering Beihang UniversityBeijing100191China

AgBi_(3)S_(5) is a new n-type thermoelectric material that is environmentally friendly and composed of elements of earth-abundant,non-toxic and high performance-cost *** compound features an intrinsically low thermal conductivity derived from its complex monoclinic ***,the terrible electrical transport properties greatly limited the improvement of thermoelectric *** previous studies considered that carrier concentration is the main reason for low electrical conductivity and focused on improving carrier concentration by aliovalent ion *** this work,we found that the critical parameter that restricts the electric transport performance of AgBi_(3)S_(5)was the extremely low carrier mobility instead of the carrier *** to the Pisarenko relationships and density functional theory calculations,Nb doping can sharpen the conduction band of AgBi_(3)S_(5),which contributes to reducing the effective mass and improving the carrier *** a further increase of the Nb doping content,the conduction band convergence can enlarge the effective mass and preserve the carrier *** with the decrease in lattice thermal conductivity due to the intensive phone scattering,a maximum ZT value of~0.50 at 773 K was achieved in Ag_(0.97)Nb_(0.03)Bi_(3)S_(5),which was~109.6%higher than that of pure *** work will stimulate the new exploration of high-performance thermoelectric materials in ternary metal sulfides.

关键词： Thermoelectric AgBi_(3)S_(5) Effective mass Carrier mobility ZT value

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Broadband programmable metasurface for multifunctional control of THz waves

Broadband programmable metasurface for multifunctional contr...

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2023 Conference on Lasers and Electro-Optics, CLEO 2023

作者： Lv, Erpeng Wang, Weiguang Liu, Songyi Pan, Tingyang Zhu, Chenxi Wang, Haiming Liu, Bingchao Hou, Yanzhao Yang, Daquan State Key Laboratory of Information Photonics and Optical Communications School of Information and Communication Engineering Beijing University of Posts and Telecommunications Beijing100876 China Guangxi Key Laboratory of Optoelectronic Information Processing School of Optoelectronic Engineering Guilin University of Electronic Technology Guilin541004 China Lenovo Research Beijing100094 China National Engineering Laboratory for Mobile Network Technologies Beijing University of Posts and Telecommunications Beijing100876 China School of information science and technology Tibet University Lhasa850000 China

We report a multifunctional terahertz (THz) programmable metasurface integrated vanadium dioxide (VO2), which can achieve dynamic beam steering from 0.735 THz to 0.965 THz and efficient polarization conversion from 0.... 详细信息

ISBN: (纸本)9781957171258

关键词： Vanadium dioxide

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Research on Pothole Detection Method for Intelligent Driving Vehicle 3

Research on Pothole Detection Method for Intelligent Driving...

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3rd International Conference on Pattern Recognition and Machine Learning, PRML 2022

作者： Zhang, Fuzeng Hamdulla, Askar Xinjiang University School of Information Science and Engineering Urumqi830017 China Xinjiang Key Laboratory of Multilingual Information Technology Urumqi830017 China

ISBN: (数字)9781665499507

ISBN: (纸本)9781665499507

The technology of identifying road potholes aims to develop real-time or offline pothole identification strategies and methods to support real-time control of vehicles for assisted driving or autonomous driving or non-real-time operations for road maintenance. As an unstructured terrain feature, potholes are widely and randomly distributed on various roads. The quality of the road conditions also has a great impact on driving. Different potholes will cause different degrees of damage to the vehicle. There are not a few major traffic accidents caused by potholes in the world, so the road potholes are related to people's life and travel. In recent years, with the improvement of living standards, pothole detection has attracted more and more attention. The continuous development of machine learning and the progress of related technologies such as intelligent driving have put forward higher requirements for pothole detection. This paper studies the existing pothole detection technology. © 2022 IEEE.

关键词： Computer vision

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Progress in models for coupled human and natural systems

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science China Earth sciences 2024年第11期67卷 3631-3637页

作者： Tianxiang YUE Chenchen WU Wenjiao SHI Yongzhong TIAN Qing WANG Yimin LU Lili ZHANG State Key Laboratory of Resources and Environment Information System Institute of Geographical Sciences and Natural Resources ResearchChinese Academy of SciencesBeijing 100101China College of Resources and Environment University of Chinese Academy of SciencesBeijing 101408China School of Geographical Sciences Southwest UniversityChongqing 400715China National Institute of Environmental Health Chinese Center for Disease Control and PreventionBeijing 100021China National Engineering Research Center of Geospatial Information Technology Fuzhou UniversityFuzhou 350108China The Aerospace Information Research Institute Chinese Academy of SciencesBeijing 100094China

1. Introduction Malthus (1798) was one of the earliest researchers to propose a coupled human-natural system (CHANS) model, particularly in his analysis of the relationship between population growth and food supply. He argued that while population grows geometrically, food supply increases only arithmetically, suggesting that this imbalance could eventually lead to a food crisis due to diminishing per capita food availability (Malthus, 1798).

关键词： Malthus eventually population

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Review Of Research Progress And Application Of Magnetic Resonant Wpt technology

Review Of Research Progress And Application Of Magnetic Reso...

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2022 CSAA/IET International Conference on Aircraft Utility systems, AUS 2022

作者： Chen, Wenxian AVIC Nanjing Engineering Institute of Aircraft System Aviation Key Laboratory of Science and Technology Nanjing211106 China Aero Electromechanical System Integration Nanjing211106 China

ISBN: (数字)9781839537769

ISBN: (纸本)9781839537769

Compared with traditional contact charging, wireless power transfer technology (WPT) has the advantages of convenience and flexibility, strong environmental adaptability, safety and reliability, and has attracted the research interest of a large number of researchers. Among them, the resonant wireless power transmission technology has good application value because of its long transmission distance and high-efficiency energy transmission characteristics, and is one of the important development directions in the field of wireless power transmission. This paper mainly introduces the concept and classification of wireless power transmission technology, reviews the development history of resonant WPT technology, and summarizes the basic structure and working principle of resonant WPT technology, hot technical issues, and product development and practical application status. It is pointed out that the resonant network including the non-contact transformer is the key to restrict the whole resonant WPT system. © 2022 IET Conference Proceedings. All rights reserved.

关键词： Inductive power transmission

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Emission of underwater acoustic orbital angular momentum and data transmission

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Chinese Journal of Acoustics 2022年第1期41卷 20-34页

作者： LU Wei SUN Hao LAN Yu Acoustic Science and Technology Laboratory Harbin Engineering UniversityHarbin 150001 Key Laboratory of Marine Information Acquisition and Security(Harbin Engineering University) Ministry of Industry and Information TechnologyHarbin 150001 College of Underwater Acoustic Engineering Harbin Engineering UniversityHarbin 150001

Emission of underwater acoustic orbital angular momentum(OAM)is studied as well as underwater acoustic communications with OAM *** acoustic properties for circular phased array are analyzed based on point source *** optimize and design an array prototype based on cymbal *** diameter of array prototype is 180 mm,the number of array elements is 10,and the working frequency is 25 k *** emits acoustic OAM with topological charges-3 to *** favorable results provide the theoretical basis for emitting acoustic OAM with different topological *** encode on-off states of acoustic OAM with different topological charges according to ASCII code to realize underwater acoustic *** transmission results suggest that acoustic OAM with various topological charges have intrinsically orthogonal *** research will offer potential applications in underwater acoustic communications.

关键词： OAM underwater momentum

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Enhanced Biodegradation of High-Salinity and Low- Temperature Crude-Oil Wastewater by Immobilized Crude-Oil Biodegrading Microbiota

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Journal of Ocean University of China 2022年第1期21卷 141-151页

作者： HUANG Xiao ZHOU Ting CHEN Xi BAI Jie ZHAO Yangguo Collaborative Innovation Center of Atmospheric Environment and Equipment Technology Jiangsu Key Laboratory of Atmospheric Environment Monitoring and Pollution ControlSchool of Environmental Science and EngineeringNanjing University of Information Science and TechnologyNanjing 210044China The Key Laboratory of Marine Environmental Science and Ecology Ministry of EducationOcean University of ChinaQingdao 266100China Harbin Institute of Technology(Shenzhen) Shenzhen Key Laboratory of Water Resource Utilization and Environmental Pollution ControlShenzhen 518055China

High salt and low temperature are the bottlenecks for the remove of oil contaminants by enriched crude-oil degrading microbiota in Liaohe Estuarine Wetland(LEW),*** improve the performance of crude-oil removal,microbiota was further immobilized by two methods,i.e.,sodium alginate(SA),and polyvinyl alcohol and sodium alginate(PVA+SA).Results showed that the crude oil was effectively removed by the enrichment with an average degrading ratio of 19.42-31.45 mg(L d)^(−1).The optimal inoculum size for the n-alkanes removal was 10%and 99.89%.Some members of genera Acinetobacter,Actinophytocola,Aquabac-terium,Dysgonomonas,Frigidibacter,Sphingobium,Serpens,and Pseudomonas dominated in crude-oil degrading *** the removal efficiency was lower than free bacteria when the temperature was 15℃,SA and PVA+SA immobilization im-proved the resistance to *** composite crude-oil degrading microbiota in this study demonstrated a perspective potential for crude oil removal from surface water under high salinity and low temperature conditions.

关键词： crude-oil degrading microbiota microbial community immobilization high salinity low temperature

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