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42nd IEEE International Conference on Computer Communications, INFOCOM 2023

作者： Guan, Yixuan Liu, Xuefeng Ren, Tao Niu, Jianwei Beihang University State Key Laboratory of Virtual Reality Technology and Systems School of Computer Science and Engineering Beijing China Zhongguancun Laboratory Beijing China Chinese Academy of Sciences Laboratory for Internet Software Technologies Institute of Software Beijing China Zhengzhou University Research Institute of Industrial Technology School of Information Engineering Zhengzhou University Zhengzhou China

ISBN: (纸本)9798350334142

Federated learning (FL) trains a shared global model by periodically aggregating gradients from local devices. Communication overhead becomes a principal bottleneck in FL since participating devices usually suffer from limited bandwidth and unreliable connections in uplink transmission. To address this problem, the gradient compression methods based on compressed sensing (CS) theory have been put forward recently. However, most existing CS-based works compress gradients independently, ignoring the gradient correlations between participants or adjacent communication rounds, which constrains the achievement of higher compression rates. In view of the above observation, we propose a novel gradient compression scheme named FedDCS, guided by distributed compressed sensing (DCS) theory. Following the design philosophy of separate encoding and joint decoding in DCS, FedDCS compresses gradients for participants in each round separately while reconstructing them at the central server jointly via fully exploiting correlated gradients from the previous round, which are known as side information (SI). Benefiting from this design, reconstruction performance is significantly improved with fewer decoding errors also iterations under the identical compression rate, and the total uploading bits to achieve model convergence are considerably reduced. Theoretical analysis and extensive experiments conducted on MNIST and Fashion-MNIST both verify the effectiveness of our approach. © 2023 IEEE.

关键词： Compressed sensing

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Fault Diagnosis of PMSM Drives Based on Digital Twin Modeling 10

Fault Diagnosis of PMSM Drives Based on Digital Twin Modelin...

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10th IEEE International Power Electronics and Motion Control Conference, IPEMC 2024 ECCE Asia

作者： Jin, Luhan Mao, Yao Wang, Xueqing Lu, Linlin Zhu, Jincong National Key Laboratory of Optical Field Manipulation Science and Technology Chinese Academy of Sciences Chengdu610209 China Chinese Academy of Sciences Key Laboratory of Optical Engineering Chengdu610209 China Chinese Academy of Sciences Institute of Optics and Electronics Chengdu610209 China University of Chinese Academy of Sciences Beijing101408 China Sichuan University College of Electrical Engineering Chengdu610065 China

ISBN: (纸本)9798350351330

To realize accurate fault diagnosis of electrical faults for the permanent magnet synchronous motor (PMSM) drive, a digital twin modeling assisted fault diagnosis method is proposed in this article. By developing a digital twin system for physical PMSM drives, the states of physical PMSM drives are precisely monitored and fault classification can be achieved without misdiagnosis. Simulation results are given to validate the feasibility of the proposed method. © 2024 IEEE.

关键词： Failure analysis

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Research on Thermal analysis and Thermal Design of a Space Inertial Sensor Using Laser Measurement

Research on Thermal Analysis and Thermal Design of a Space I...

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2021 International Conference on Mechatronics technology and Aerospace Engineering, ICMTAE 2021

作者： Chen, Haowen Li, Zongfeng Wang, Yi School of Computer Science and Technology University of Chinese Academy of Sciences Beijing10049 China Key Laboratory of Space Utilization Technology and Engineering Center for Space Utilization Chinese Academy of Sciences Beijing10094 China

In this paper, a new space inertial sensor based on laser interferometry developed by the experimental team is used for temperature simulation analysis of multi-physics coupling. Through the analysis of the noise influence of the inertial sensor, it is calculated that under the index of the acceleration noise level of 1×10-10 g/Hz1/2, the temperature fluctuation of the Test Mass (TM) needs to be controlled ¯0.1 °C. The finite element analysis method is used to simulate and calculate the temperature change inside the inertial sensor within 36 hours. In the case of no heat insulation component, the temperature difference between the six surfaces of the TM is maintained within 10-5K, and the temperature of the Electrode Housing (EH) only fluctuates ±0.1K in the stable fluctuation section when the external environment fluctuates ±1K. After 36h, the temperature of the TM decreased by 0.007K compared with the initial value. With the addition of heat insulation components, the fluctuation range of internal temperature decreases, and the temperature of the EH fluctuates within the range of ±0.015K. © Published under licence by IOP Publishing Ltd.

关键词： Thermoanalysis

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High precision air gap thickness measurement based on spectral reflectometry

High precision air gap thickness measurement based on spectr...

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2024 International Conference on Optoelectronic Information and Optical Engineering, OIOE 2024

作者： Liu, Li Gong, Tiancheng Zhao, Chengwei Jia, Guiyuan Chu, Yanwu Wang, Changtao National Key Laboratory of Optical Field Manipulation Science and Technology Chinese Academy of Sciences Sichuan Chengdu610209 China State Key Laboratory of Optical Technologies for Micro-Fabrication Institute of Optics and Electronics Chinese Academy of Sciences Sichuan Chengdu610209 China Institute of Optics and Electronics Chinese Academy of Sciences Sichuan Chengdu610209 China University of Chinese Academy of Sciences Beijing100049 China

ISBN: (数字)9781510680470

ISBN: (纸本)9781510680463

Spectral reflectometry is widely used to measure the crucial parameters such as thickness and refractive index of film, surface morphology and grating constant in a convenient way. In this work, we focus on the measurement of air gap between two parallel plates. The transfer matrix method (TMM) and rigorous coupled-wave analysis (RCWA) are independently used to build the theoretical model of the air gap with micro and nano scale between two parallel plates, and then we compare the results. Through the simulation of reflectance spectrum based on optimized TMM. The influence of interfacial roughness of multilayer structure is analyzed. Then we introduce a merit function which includes air gap and interfacial roughness and then optimize them using genetic algorithm to solve the measured air gap value. The absolute measurement of air gap thickness and subsequent displacement measurement result indicate that our method has the advantage of high precision, resolution and stability. © 2024 SPIE.

关键词： Transfer matrix method

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Spatiotemporal evolution and future simulation of land use/land cover in the Turpan-Hami Basin,China

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Journal of Arid Land 2024年第10期16卷 1303-1326页

作者： CHEN Yiyang ZHANG Li YAN Min WU Yin DONG Yuqi SHAO Wei ZHANG Qinglan Key Laboratory of Digital Earth Science Aerospace Information Research InstituteChinese Academy of SciencesBeijing100094China International Research Center of Big Data for Sustainable Development Goals Beijing 100094China University of Chinese Academy of Sciences Beijing 100094China Xinjiang Uygur Autonomous Region Natural Resources Planning and Research Institute Urumqi 830011China School of Geomatics and Marine Information Jiangsu Ocean UniversityLianyungang 222001China College of Geomatics and Geoinformation Guilin University of TechnologyGuilin 541004China

The Turpan-Hami(Tuha)Basin in Xinjiang Uygur Autonomous Region of China,holds significant strategic importance as a key economic artery of the ancient Silk Road and the Belt and Road Initiative,necessitating a holistic understanding of the spatiotemporal evolution of land use/land cover(LULC)to foster sustainable planning that is tailored to the region's unique resource ***,existing LULC classification methods demonstrate inadequate accuracy,hindering effective regional *** this study,we established a two-level LULC classification system(8 primary types and 22 secondary types)for the Tuha *** employing Landsat 5/7/8 imagery at 5-a intervals,we developed the LULC dataset of the Tuha Basin from 1990 to 2020,conducted the accuracy assessment and spatiotemporal evolution analysis,and simulated the future LULC under various scenarios via the Markov-Future Land Use Simulation(Markov-FLUS)*** results revealed that the average overall accuracy values of our LULC dataset were 0.917 and 0.864 for the primary types and secondary types,*** with the seven mainstream LULC products(GlobeLand30,Global 30-meter Land Cover with Fine Classification System(GLC_FCS30),Finer Resolution Observation and Monitoring of Global Land Cover PLUS(FROM_GLC PLUS),ESA Global Land Cover(ESA_LC),Esri Land Cover(ESRI_LC),China Multi-Period Land Use Land Cover Change Remote Sensing Monitoring Dataset(CNLUCC),and China Annual Land Cover Dataset(CLCD))in 2020,our LULC data exhibited dramatically elevated overall accuracy and provided more precise delineations for land features,thereby yielding high-quality data backups for land resource analyses within the *** 2020,unused land(78.0%of the study area)and grassland(18.6%)were the dominant LULC types of the basin;although cropland and construction land constituted less than 1.0%of the total area,they played a vital role in arid land development and primarily situated within oases that form the urban co

关键词： land use/land cover(LULC) future simulation manual interpretation Markov-Future Land Use Simulation(Markov-FLUS)model Turpan-Hami(Tuha)Basin Xinjiang

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Promoting effect of d-band center and in-situ precipitation strategy on sulfur evolution reaction

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Journal of Energy Chemistry 2025年第5期104卷 740-748页

作者： Jun Pu Yun Tan Jiasen Yin Zihan Shen Shoujie Liu Kai Zhang Lei Zhou Yagang Yao Key Laboratory of Functional Molecular Solids Ministry of EducationAnhui Provincial Engineering Laboratory for New-Energy Vehicle Battery Energy-Storage MaterialsCollege of Chemistry and Materials ScienceAnhui Normal UniversityWuhu 241002AnhuiChina National Laboratory of Solid State Microstructures College of Engineering and Applied SciencesJiangsu Key Laboratory of Artificial Functional MaterialsCollaborative Innovation Center of Advanced MicrostructuresNanjing UniversityNanjing 210093JiangsuChina State Key Laboratory of Multiphase Complex Systems Institute of Process EngineeringChinese Academy of SciencesBeijing 100190China School of Materials Science and Engineering Anhui UniversityHefei 230601AnhuiChina School of Energy and Power Engineering Jiangsu UniversityZhenjiang 212013JiangsuChina Department of Electrical Engineering Eindhoven University of TechnologyEindhoven MB 5600the Netherlands

The slow conversion of polyphase in lithium-sulfur(Li-S)batteries not only intensifies the shuttle effect of lithium polysulfides(LiPSs),but also causes the continuous accumulation of inactive sulfur species,resulting in rapid capacity attenuation and sluggish dynamic ***,the promoting effect of atomic interface stress on sulfur reaction was investigated via CoFe-CoFe_(2)O_(4)heterogeneous nanosheets with a cavity *** strain force induced by the in-situ precipitation of Co Fe bimetallic alloy in oxide matrix increased the d-band center,which was conducive to the interaction between catalyst and Li *** sulfur cathode based on this two-dimensional(2D)nanosheet design showed an extremely high capacity of 751 mAh g^(-1)at 4 *** with a sulfur loading of 5.55 mg cm^(-2),its area capacity was still as high as 7.15 mAh cm^(-2).Meanwhile,the enhanced stability greatly improved the practical potential of Li-S batteries.

关键词： 2D nanosheets In-situ precipitation Strain effect D-band center Li-S batteries

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Service-Based Event Penetration from IoT Sensors to Businesses: a Case Study

Service-Based Event Penetration from IoT Sensors to Business...

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2022 CCF International Conference on Service science, CCF ICSS 2022

作者： Wang, Guiling Fang, Jun Wang, Jing Yu, Jian Zhang, Liang Han, Yanbo Beijing Key Laboratory on Integration and Analysis of Large-Scale Stream Data Beijing China North China University of Technology School of Information Science and Technology Beijing China Auckland University of Technology Department of Computer Science Auckland New Zealand Shanghai Key Laboratory of Data Science Shanghai China Shanghai Institute of Intelligent Electronics & Systems Shanghai China

ISBN: (数字)9781665498616

ISBN: (纸本)9781665498616

By leveraging IoT Big Data, BPM can gain real-time physical world information to make faster and more accurate decisions, but there is a technical gap between IoT sensors and businesses. To bridge the gap, an event penetration mechanism from IoT sensors to business processes is proposed along a practical case study. This paper presents a concrete IoT-BPM application case dealing with seaborne safety ensurance in transporting liquefied natural gas (LNG), analyzes its technical challenges, and examines the feasibility and supposed effects of the BRIBOT approach. © 2022 IEEE.

关键词： Internet of things

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B-Site Nanoscale-Ordered Structure Enables Ultra-High Tunable Performance

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Research 2023年第1期2022卷 413-426页

作者： Biaolin Peng Qiuping Lu Yi-Chi Wang Jing-Feng Li Qi Zhang Haitao Huang Laijun Liu Chao Li Limei Zheng Zhong Lin Wang ISchool of Advanced Materials and Nanotechnology Xidian UniversityXi'an 710126China Beijing Institute of Nanoenergy and Nanosystems Chinese Academy of SciencesBeijing 101400China State Key Laboratory of New Ceramics and Fine Processing Department of Materials Science and EngineeringTsinghua UniversityBeijing 100084China Basque Centre for Materials Applications and NanostructuresUPV/EHU Science ParkBarrio Sarriena s/n48940 LeioaSpain kerbasque Basque Foundation for SciencePlaza Euskadi5Bilbao 48009Spain Department of Applied Physics The Hong Kong Polytechnic UniversityKowloonHong Kong Guangxi Key Laboratory of Optical and Electronic Materials and Devices Guilin University of TechnologyGuilin 541004China Instrument Analysis Center Xi'an Jiaotong UniversityXi'an 710049China 'School of Physics Shandong UniversityJinan 250100China school of Materials Science and Engineering Georgia Institute of TechnologyAtlantaGeorgia 30332-0245USA

Tunable devices constructed by ferroelectric thin flms are often desired to possess a low dielectric loss while maintainging a high dielectric tunability over a broad operating temperature range in applications,for example,resonators,filters,or phase ***,it is dificult to simultaneously achieve these characteristics by traditional strategies,such as doping and strain ***,we demonstrate that the dielectric tunability of the sol-gel-prepared Pb(Sc_(1/2)Nb_(1/2))_(0.9)(Mg_(1/3)Nb_(2/3))_(0.O3)(PSNMN)thin film can be almost doubled from~47%to~80.0%(at 10kHz)at a low electric field(~530kV/cm),and the dielectric loss can be sharply reduced by more than an order of magnitude,from~0.50 to~0.037(at 1 kHz)when the thin flm was annealed in air at 650℃ for 15h under the help of an atmosphere-compensating-block(ACB)made from the proto-PSNMN ***,the PSNMN thin flm annealed with ACB also exhibited an extremely high thermally-stable dielectric tunability in an ultrabroad temperature range(>130 K),which could be attributed to the Maxwell-Wagner(MW)effect generated by the interface between the PSNMN disordered matrix and the B-site nanoscale-ordered structure formed during the long-term annealing *** reduced dielectric loss is mainly benefited from the reduced concentration of oxygen vacancy and the possibie MW efects,and the enhanced dielectric tunability could be ascribed to the weaker domain-pinning effect by oxygen *** breakthrough provides a new universal strategy to achieve utrahigh tunable performance in A(B'_(1/2)B"_(1/2))O3 ferroelectric thin films with a B-site nanoscale-ordered structure,meanwhile it paves the way for ultraintergrated tunable thin-flm-devices with great phase shifter performance in practical applications.

关键词： dielectric ferroelectric breakthrough

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A Mode-Localized DC Electric Field Microsensor with 0.4 V/ m Resolution

A Mode-Localized DC Electric Field Microsensor with 0.4 V/ m...

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IEEE SENSORS

作者： Pengfei Yang Ruohang Wang Zhaozhi Chu Xiaolong Wen Chunrong Peng School of Applied Science Beijing Information Science and Technology University Beijing China Beijing Key Laboratory for Sensors Beijing Information Science and Technology University Beijing China State Key Laboratory of Transducer Technology Aerospace Information Research Institute Chinese Academy of Sciences Beijing China Institute of Microelectronics of Chinese Academy of Sciences Beijing China School of Mathematics and Physics University of Science and Technology Beijing Beijing China

ISBN: (数字)9798350363517

ISBN: (纸本)9798350363524

This paper reports a high-resolution DC electric field microsensor based on mode localization of three weakly coupled resonators (WCRs). We propose an innovative electric field input structure capable of generating a larger electrostatic negative stiffness to the WCRs. Consequently, this results in a larger amplitude ratio output from the WCRs. Furthermore, a theoretical analysis reveals that the square root of the amplitude ratio corresponds proportionally to the measured electric field. The device was fabricated and tested. The results show that the sensitivity is 36.235 ppm/(V /m), which is 2013 times greater than that based on mode frequency (0.018 ppm/(V 1m). The resolution is 0.4 V/m, roughly two orders of magnitude higher compared to that of the reported microsensors based on field mill principle and mode localization.

关键词： Location awareness Micromechanical devices Time-frequency analysis Sensitivity Electrostatic measurements Sensors Electric fields Microsensors Resonators Electrostatics

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Searching for the Nano-Hertz Stochastic Gravitational Wave Background with the Chinese Pulsar Timing Array Data ReleaseⅠ

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Research in Astronomy and Astrophysics 2023年第7期23卷 300-311页

作者： Heng Xu Siyuan Chen Yanjun Guo Jinchen Jiang Bojun Wang Jiangwei Xu Zihan Xue RNicolas Caballero Jianping Yuan Yonghua Xu Jingbo Wang Longfei Hao Jingtao Luo Kejia Lee Jinlin Han Peng Jiang Zhiqiang Shen Min Wang Na Wang Renxin Xu Xiangping Wu Richard Manchester Lei Qian Xin Guan Menglin Huang Chun Sun Yan Zhu National Astronomical Observatory Chinse Academy of SciencesBeijing 100101China Kavli Institute for Astronomy and Astrophysics Peking UniversityBeijing 100871China Department of Astronomy School of PhysicsPeking UniversityBeijing 100871China Max-Planck institut fúr Radioastronomie Auf Dem HúgelBonnD-53121Germany Hellenic Open University School of Science and Technology26335 PatrasGreece Xinjiang Astronomical Observatory Chinese Academy of SciencesUrumqi 830011China Yunnan Astronomical Observatories Chinese Academy of SciencesKunming 650216China Institute of Optoelectronic Technology Lishui UniversityLishui 323000China National Time Service Center Chinese Academy Of SciencesXi'an 710600China Key Laboratory of Radio Astronomy and Technology Chinese Academy of SciencesBeijing 100101China Beijing Laser Acceleration Innovation Center HuairouBeijing 101400China Shanghai Astronomical Observatory Chinese Academy of SciencesShanghai 200030China State Key Laboratory of Nuclear Physics and Technology School of PhysicsPeking UniversityBeijing 100871China Australia Telescope National Facility CSIRO Space and AstronomyP.O.Box 76Epping NSW 1710Australia

Observing and timing a group of millisecond pulsars with high rotational stability enables the direct detection of gravitational waves(GWs).The GW signals can be identified from the spatial correlations encoded in the times-of-arrival of widely spaced *** Chinese Pulsar Timing Array(CPTA)is a collaboration aiming at the direct GW detection with observations carried out using Chinese radio *** short article serves as a“table of contents”for a forthcoming series of papers related to the CPTA Data Release 1(CPTA DR1)which uses observations from the Five-hundred-meter Aperture Spherical radio ***,after summarizing the time span and accuracy of CPTA DR1,we report the key results of our statistical inference finding a correlated signal with amplitude logA_(c)=-14.4_(-2.8)^(+1.0)for spectral index in the range ofα∈[-1.8,1.5]assuming a GW background(GWB)induced quadrupolar *** search for the Hellings–Downs(HD)correlation curve is also presented,where some evidence for the HD correlation has been found that a 4.6σstatistical significance is achieved using the discrete frequency method around the frequency of 14 n *** expect that the future International Pulsar Timing Array data analysis and the next CPTA data release will be more sensitive to the n Hz GWB,which could verify the current results.

关键词： (stars:)pulsars:general gravitational waves methods:statistical methods:observational

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