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arXiv 2022年

作者： Chang, Lei Caneses, Juan F. Thakur, Saikat C. Zhang, Huai-Qing State Key Laboratory of Power Transmission Equipment & System Security and New Technology Chongqing University Chongqing400044 China Institute of Plasma Physics Chinese Academy of Sciences Hefei230031 China CompX Del MarCA92014 United States Department of Physics Auburn University AuburnAL36849 United States

The wave propagation and power deposition in blue-core helicon plasma are computed referring to recent experiments. It is found that the radial profile of wave electric field peaks off-axis during the blue-core formation, and the location of this peak is very close to that of particle transport barrier observed in experiment;the radial profile of wave magnetic field shows multiple radial modes inside the blue-core column, which is consistent with the experimental observation of coherent high m modes through Bessel function. The axial profiles of wave field indicate that, once the blue-core mode has been achieved, waves can only propagate inside the formed column with distinct phase compared to that outside. The wave energy distribution shows a clear and sharp boundary at the edge of blue-core column, besides which periodic structures are observed and the axial periodicity inside is nearly twice that outside. The dispersion relation inside the blue-core column exhibits multiple modes, a feature of resonant cavity that selects different modes during frequency variation, while the dispersion relation outside gives constant wave number with changed frequency. The power deposition appears to be off-axis in the radial direction and periodic in the axial direction, and mostly inside the blue-core column. Analyses based on step-like function theory and introduced blue-core constant provide consistent results. The equivalence of blue-core column to optical fiber for electromagnetic communication is also explored and inspires a novel application of helicon plasma, which may be one of the most interesting findings of present work. © 2022, CC BY.

关键词： Electric fields

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Recent development of chemically complex metallic glasses: from accelerated compositional design, additive manufacturing to novel applications

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Materials Futures 2022年第1期1卷 9-31页

作者： J Y Zhang Z Q Zhou Z B Zhang M H Park Q Yu Z Li J Ma A D Wang H G Huang M Song B S Guo Q Wang Y Yang Department of Mechanical Engineering College of EngineeringCity University of Hong KongKowloon TongKowloonHong KongPeople’s Republic of China Shenzhen Key Laboratory of High Performance Nontraditional Manufacturing College of Mechatronics and Control EngineeringShenzhen UniversityShenzhenGuangdong 518060People’s Republic of China School of Materials Science and Engineering Dongguan University of TechnologyDongguanGuangdong 523808People’s Republic of China Institute of Materials China Academy of Engineering PhysicsJiangyouSichuan 621907People’s Republic of China State Key Laboratory of Powder Metallurgy Central South UniversityChangshaHunan 410083People’s Republic of China Institute of Advanced Wear&Corrosion Resistant and Functional Materials Jinan UniversityGuangzhouGuangdong 510632People’s Republic of China Institute of Materials Laboratory for MicrostructuresShanghai UniversityShanghai 200444People’s Republic of China Department of Materials Science and Engineering College of EngineeringCity University of Hong KongKowloon TongKowloonHong KongPeople’s Republic of China Department of Advanced Design and System Engineering College of EngineeringCity University of Hong KongKowloon TongKowloonHong KongPeople’s Republic of China

Metallic glasses(MGs)or amorphous alloys are an important engineering material that has a history of research of about 80–90 *** different fast cooling methods were developed for multi-component MGs between 1960s and 1980s,1990s witnessed a surge of research interest in the development of bulk metallic glasses(BGMs).Since then,one central theme of research in the metallic-glass community has been compositional design that aims to search for MGs with a better glass forming ability,a larger size and/or more interesting properties,which can hence meet the demands from more important *** this review article,we focus on the recent development of chemically complex MGs,such as high entropy MGs,with new tools that were not available or mature yet until recently,such as the state-of-the-art additive manufacturing technologies,high throughput materials design techniques and the methods for big data analyses(*** learning and artificial intelligence).We also discuss the recent use of MGs in a variety of novel and important applications,from personal healthcare,electric energy transfer to nuclear energy that plays a pivotal role in the battle against global warming.

关键词： metallic glasses amorphous alloys alloy design additive manufacturing machine learning high throughput materials design

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Large-Scale Spatiotemporal Deep Learning Predicting Residential Indoor Pm2.5 Concentration Using a Bayesian Neural Network Model

SSRN

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SSRN 2023年

作者： Dai, Hui Liu, Yumeng Wang, Jianghao Ren, Jun Gao, Yao Dong, Zhaomin Zhao, Bin Department of Building Science School of Architecture Tsinghua University Beijing100084 China Beijing Key Laboratory of Indoor Air Quality Evaluation and Control Tsinghua University Beijing100084 China School of Space and Environment Beihang University Beijing100191 China State Key Laboratory of Resources and Environmental Information System Institute of Geographic Sciences and Natural Resources Research Chinese Academy of Sciences Beijing100101 China Sustainable Urbanization Lab Department of Urban Studies and Planning Massachusetts Institute of Technology CambridgeMA02139 United States Shenzhen Institute of Building Research Co. Ltd China

Indoor PM2.5 pollution is one of the leading causes of death and disease worldwide. As monitoring indoor PM2.5 concentrations on a large scale is challenging, it is urgent to assess population-level exposure and related health risks to develop an easy-to-use and generalized model to predict indoor PM2.5 concentrations and spatiotemporal variations at the global level. Existing machine learning models of indoor PM2.5 are prone to deliver single-point predictions, and their input strategies are not widely applicable. Here, we developed a Bayesian neural network (BNN) model for predicting the distribution of indoor daily average PM2.5 concentration based on multiple data sources available from nationwide comprehensive sensor-monitoring records in China. The BNN model showed good performance with a 10-fold cross-validation R2 of 0.70, mean-absolute-error of 9.45 μg/m3, root-mean-square error of 13.3 μg/m3, and 95% prediction interval coverage of 85%. Our modeled population-weighted annual indoor PM2.5 concentration for China in 2019 was 22.8 μg/m3, far exceeding the WHO standard. This model can be applied to predict indoor PM2.5 concentrations on a large spatiotemporal scale, making it valuable for assessing and managing indoor air pollution-related health risks. © 2023, The Authors. All rights reserved.

关键词： Health risks

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Comprehensive analysis and design of LLC resonant converter with magnetic control

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CPSS Transactions on Power Electronics and Applications 2019年第4期4卷 265-275页

作者： Wei, Yuqi Luo, Quanming Mantooth, Alan The State Key Laboratory of Power Transmission Equipment and System Security and New Technology Chongqing University Chongqing China The Department of Electrical Engineering University of Arkansas Fayetteville United States

Conventionally, LLC resonant converter adopts frequency control (FC) or combine FC with phase shift control (PSC) to regulate the output voltage. However, for both control strategies, a variable switching frequency operation range is required, which makes the magnetic component and driver circuit design complicated. In this paper, the magnetic control (MC) or variable inductor control is adopted for the LLC resonant converter. Thanks to MC, constant switching frequency and duty cycle can be implemented for the primary switches. A comprehensive analysis of the magnetically controlled LLC resonant converter is presented, which includes the operation principle, voltage gain, and soft switching operation. Meanwhile, a design methodology for LLC resonant converter with MC is proposed, especially the design considerations for the variable inductor are discussed. By adopting the proposed design methodology, the zero voltage switching (ZVS) operation for the primary switches and the zero current switching (ZCS) operation for the secondary rectifier can be achieved. Finally, a 200 W experimental setup is built to validate the theoretical analysis. © CPSS Transactions on Power Electronics and Applications 2019. All rights reserved.

关键词： Zero current switching

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A Parameter-Centric Approach for Enhancing Misalignment Tolerance in Wireless Power Transfer systems

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IEEE Transactions on Power Electronics 2025年

作者： Yuan, Zhaoyang Yang, Qingxin Cai, Changsong Zhang, Pengcheng Wang, Ran Ma, Xianjie Lin, Hongjian Saeedifard, Maryam Wuhan University Hubei Key Laboratory of Power Equipment & System Security for Integrated Energy School of Electrical Engineering and Automation Wuhan430072 China Tianjin University of Technology Tianjin300384 China Tsinghua University Department of Electrical Engineering Beijing100084 China Heze Power Supply Company State Grid Shandong Electric Power Company Heze274000 China Laixi Power Supply Company State Grid Shandong Electric Power Company Qingdao266600 China University of Alberta Department of Electrical and Computer Engineering ABT6G 2R3 Canada Georgia Institute of Technology School of Electrical and Computer Engineering AtlantaGA30332 United States

This paper introduces a misalignment-tolerant design method for wireless power transfer (WPT) systems by optimization of compensation network parameters. Leveraging the derivation of two-port impedance parameters and adjoint sensitivity analysis, the coupling misalignment characteristics of the system are assessed. Subsequently, a parameter-centric misalignment tolerant approach, independent of the coil structure, is established through a linear fitting method. The proposed approach ensures zero-voltage switching (ZVS) and facilitates efficient stable constant current (CC) output. Experimental validation is performed on a scaled-down 500-W rated SS-compensated WPT prototype equipped with non-specialized square-shaped coils, demonstrating the effectiveness of the proposed approach. The proposed method enhances the SS-compensated system's ability to tolerate both horizontal and vertical misalignments, surpassing the performance of conventional SS topologies. Specifically, the system achieves over 85% efficiency within the misalignment tolerance range, with a peak efficiency of 93.2%. Additionally, the load current variation remains within 5.8% for 100 mm x-misalignment and -15 to +50 mm z-misalignment. © 1986-2012 IEEE.

关键词： Inductive power transmission

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Empirical estimates of regional carbon budgets imply reduced global soil heterotrophic respiration

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National Science Review 2021年第2期8卷 60-73页

作者： Philippe Ciais Yitong Yao Thomas Gasser Alessandro Baccini Yilong Wang Ronny Lauerwald Shushi Peng Ana Bastos Wei Li Peter A.Raymond Josep G.Canadell Glen P.Peters Rob J.Andres Jinfeng Chang Chao Yue A.Johannes Dolman Vanessa Haverd Jens Hartmann Goulven Laruelle Alexandra G.Konings Anthony W.King Yi Liu Sebastiaan Luyssaert Fabienne Maignan Prabir K.Patra Anna Peregon Pierre Regnier Julia Pongratz Benjamin Poulter Anatoly Shvidenko Riccardo Valentini Rong Wang Grégoire Broquet Yi Yin Jakob Zscheischler Bertrand Guenet Daniel S.Goll Ashley-P.Ballantyne Hui Yang Chunjing Qiu Dan Zhu State Key Laboratory of Soil Erosion and Dryland Farming on the Loess Plateau Northwest A&F University CSIRO Oceans and Atmosphere 15. Institute for Geology CEN—Center for Earth System Research and SustainabilityUniversity of Hamburg 16. Department of Earth System ScienceStanford University 17. Department of Earth System ScienceStanford UniversityStanford 18. School of Geographical SciencesNanjing University of Information Science and Technology 19. Department of Ecological SciencesVrije Universiteit Amsterdam 20. Research Institute for Global ChangeJAMSTEC Laboratoire des Sciences du Climat et de l'Environnement CEA-CNRS-UVSQ-UPSACLAY Center for Environmental Remote Sensing Chiba University Institute of Soil Science and Agrochemistry Siberian Branch of the Russian Academy of Sciences (SB RAS) Tuva State University Republic of Tuva Max Planck Institute for Meteorology NASA Goddard Space Flight Center Biospheric Sciences Lab. 26. Department for Innovation in BiologicalAgro-food and Forest systems (DIBAF)University of Tuscia RUDN University Department of Environmental Science and Engineering Shanghai Key Laboratory of Atmospheric Particle Pollution and PreventionInstitute of Atmospheric SciencesFudan University 29. Division of Geological and Planetary SciencesCalifornia Institute of Technology 30. Climate and Environmental Physics and Oeschger Centre for Climate Change ResearchUniversity of Bern 31. Department of Ecosystem and Conservation Sci

Resolving regional carbon budgets is critical for informing land-based mitigation policy. For nine regions covering nearly the whole globe, we collected inventory estimates of carbon-stock changes complemented by satellite estimates of biomass changes where inventory data are missing. The net land–atmospheric carbon exchange(NEE) was calculated by taking the sum of the carbon-stock change and lateral carbon fluxes from crop and wood trade, and riverine-carbon export to the ocean. Summing up NEE from all regions, we obtained a global ‘bottom-up’ NEE for net land anthropogenic CO2uptake of –2.2 ± 0.6 Pg C yr-1consistent with the independent top-down NEE from the global atmospheric carbon budget during 2000–2009. This estimate is so far the most comprehensive global bottom-up carbon budget accounting, which set up an important milestone for global carbon-cycle studies. By decomposing NEE into component fluxes, we found that global soil heterotrophic respiration amounts to a source of CO2of 39 Pg C yr-1with an interquartile of 33–46 Pg C yr-1—a much smaller portion of net primary productivity than previously reported.

关键词： carbon budget human appropriation of ecosystems soil carbon

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Patterns and change rates of glacial lake water levels across High Mountain Asia

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National Science Review 2025年第3期 104-107页

作者： Yingzheng Wang Donghai Zheng Guoqing Zhang Jonathan L.Carrivick Tobias Bolch Weiwei Ren Lei Guo Jianbin Su Shiwei Yuan Xin Li National Tibetan Plateau Data Center (TPDC) State Key Laboratory of Tibetan Plateau Earth System Environment and Resources (TPESER) Institute of Tibetan Plateau Research Chinese Academy of Sciences College of Earth and Environmental Sciences Lanzhou University School of Geography and water＠leeds University of Leeds Institute of Geodesy Graz University of Technology School of Geosciences and Info-physics Central South University

Glacial lakes, which form and enlarge due to glacier retreat and meltwater accumulation, serve as indicators of climate change and glacier mass loss [1]. High Mountain Asia(HMA), which encompasses the Tibetan Plateau, greater Himalaya and Tien Shan, is recognized because its glacier coverage is the largest outside of the Antarctic and Arctic [2].Atmospheric warming across HMA has occurred at a rate that is twice that of the global average [3] and has led to accelerated glacier mass loss and a substantial increase in the number and area of glacial lakes [4]. The concentrated population and infrastructure development, including hydropower and transport networks,in the downstream areas of HMA make it the most vulnerable region to glacial lake outburst floods(GLOFs) in the world[5].

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Chaotic time-delay signature suppression using quantum noise

arXiv

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arXiv 2021年

作者： Guo, Yanqiang Fang, Xin Zhang, Haojie Zhao, Tong Virte, Martin Guo, Xiaomin Key Laboratory of Advanced Transducers and Intelligent Control System Ministry of Education College of Physics and Optoelectronics Taiyuan University of Technology Taiyuan030024 China State Key Laboratory of Cryptology Beijing100878 China Brussels Photonics Department of Applied Physics and Photonics Vrije Universiteit Brussel Brussels1050 Belgium

Time-delay signature (TDS) suppression of semiconductor lasers with external optical feedback is necessary to ensure security of chaos-based secure communications. Here we numerically and experimenttally demonstrate a technique to effectively suppress the TDS of chaotic laser using quantum noise. The TDS and dynamical complexity are quantified using the autocorrelation function and normalized permutation entropy at the feedback delay time, respectively. Quantum noise from quadrature fluctuations of vacuum state is prepared through balanced homodyne measurement. The effects of strength and bandwidth of quantum noise on chaotic TDS suppression and complexity enhancement are investigated numerically and experimentally. Compared to the original dynamics, the TDS of this quantum-noise improved chaos is sup-pressed up to 94% and the bandwidth suppression ratio of quantum noise to chaotic laser is 1:25. The experiment agrees well with the theory. The improved chaotic laser is potentially beneficial to chaos-based random number generation and secure communication. Copyright © 2021, The Authors. All rights reserved.

关键词： Time delay

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Day-ahead Intra-day Economic Dispatch Methodology Accounting for the Participation of Electrolytic Aluminum Loads and Energy Storage in Power system Peaking

Day-ahead Intra-day Economic Dispatch Methodology Accounting...

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Power Science and technology (ICPST), IEEE International Conference on

作者： Wei Zheng Peng Yu Zhaoyang Xu Tianzhen Fan Hengyu Liu Meng Yu Jiong Zhang Junhui Li State Grid Liaoning Electric Power Supply Co. Ltd State Grid Fushun Electric Power Supply Company Liao Ning China State Grid Liaoning Electric Power Co. Ltd State Grid Liaoning Electric Power Company Limited Power Dispatch And Control Center Liao Ning China State Grid Electric Power Research Institute Co. Ltd State Grid Electric Power Research Institute Wuhan Efficiency Evaluation Co. Ltd Hu Bei China Key Laboratory of Modern Power System Simulation and Control & Renewable Energy Technology (Northeast Electric Power University) Ji Lin China State Grid Liaoning Electric Power Co. Ltd State Grid Liaoning Electric Power Company Limited Electric Power Research Institute Liao Ning China

ISBN: (数字)9798350349030

ISBN: (纸本)9798350349047

Under the background of dual-carbon target and large-scale new energy access, most of the existing power system scheduling modes focus on the power source side, ignoring the potential of load-side interaction with the grid for peak shifting. In order to promote two-way coordination and interaction on both sides of the source and load sides, and to guarantee the balance of power supply and demand on different time scales and the high level of new energy consumption, it is proposed to incorporate the representative electrolysis aluminum loads on the load side into the main body of the scheduling, and to optimize the dispatching of power supply and demand through the configuration of It is proposed that the representative electrolytic aluminum load on the load side should be included in the main body of dispatch, and by configuring battery energy storage devices on the load side, joint optimal dispatch with thermal power units containing carbon capture devices should be carried out. With the optimization objective of minimizing the operating cost of the power system, a joint day-ahead-intraday economic dispatch method is developed. Finally, simulation calculations are carried out with an example to show that the proposed peaking model can effectively guide the demand response of the aluminum loads, increase the rate of new energy consumption, and reduce the operating cost of the system at the same time.

关键词： Energy consumption Costs Power supplies Aluminum Optimal scheduling Wind power generation Regulation

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Spectroscopic Characterization of Buffer-Gas-Cooled Lead Monofluoride Molecules in the B2σ+(Υ'=0) ← X12π1/2(Υ=0) Transition

SSRN

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SSRN 2024年

作者： Wang, Zesen Pang, Renjun Ma, Jie Lin, Qinning Hou, Shunyong Wang, Hailing Li, Xiaohu Xu, Liang Li, Xinjia Chen, Guanglong Liu, Jinjun Yin, Jianping Yang, Tao State Key Laboratory of Precision Spectroscopy East China Normal University Shanghai200062 China Xinjiang Astronomical Observatory Chinese Academy of Sciences 150 Science 1 − Street Urumqi Xinjiang830011 China Shanghai Key Lab of Modern Optical System University of Shanghai for Science and Technology Shanghai200093 China School of Mathematics Physics and Statistics Shanghai University of Engineering Science Shanghai201620 China Department of Chemistry Department of Physics University of Louisville LouisvilleKY40292 United States Collaborative Innovation Center of Extreme Optics Shanxi University Shanxi Taiyuan030006 China

The nonzero measurement of the electron's Electric Dipole Moment (eEDM) has long been a fundamental pursuit in atomic, molecular and optical physics, offering possible insights into new physics beyond the Standard Model. In this regard, lead monofluoride (PbF) has emerged as a potential candidate for measuring eEDM primarily due to its suitable properties such as the strong internal effective electric field, and eEDM-sensitive ground state with large Ω-doubling and small magnetic g factor. In this article, we realize the production of a buffer-gas-cooled PbF molecular beam and characterize its high-resolution spectroscopy in the B2Σ+(υ'=0) ← X12Π1/2(υ=0) transition, including both direct absorption and laser-induced fluorescence spectroscopy. A highly concentrated beam of PbF molecules is obtained at its central forward velocity of 223 ± 17 m/s, while 81, 66 and 24 hyperfine-resolved spectral lines with an accuracy of 40 MHz have been assigned respectively for 208PbF, 207PbF and 206PbF isotopologues. The hyperfine constants (Frosch and Foley parameters) due to the 19F nucleus (b1 and c1) of the B state are reported for the first time, and those owing to the 207Pb nucleus (b2 and c2) have been also updated. Such a cryogenic molecular beam of PbF in association with its hyperfine-resolved spectral atlas of B2Σ+(υ'=0) ← X12Π1/2(υ=0) will be essential in developing sensitive detection schemes towards the eEDM measurement. © 2024, The Authors. All rights reserved.

关键词： Molecules

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