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2022 Joint Magnetism and Magnetic Materials - Intermag Conference, INTERMAG 2022

作者： Jiang, Hao Su, Zhenzhong Wang, Dong Wu, Chao Li, Zhi Naval University of Engineering National Key Laboratory of Science and Technology on Vessel Integrated Power System Wuhan430000 China

ISBN: (纸本)9781665483346

In order to overcome the large axial thrust generated by the working substance (steam or gas, etc) of turbomachinery, an asymmetric axial magnetic bearing (AAMB) is proposed. Firstly, the topology and features of the AAMB are introduced. The magnetic circuit model of the AAMB is established by the reluctance network method. Secondly, the constraints such as the load capacity and dimensions are considered. Then we take the shortest axial length as the optimization goal to design the AAMB, and the design scheme is obtained through genetic algorithm (GA). Finally, the supporting characteristics of the AAMB are verified by finite element method (FEM). The result shows that the overall axial length of the AAMB is less than 82.1 mm of that in the traditional design scheme. © 2022 IEEE.

关键词： Genetic algorithms

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Online Prediction Product control based on Information-aware Weight and Error Compensation 3

Online Prediction Product Control based on Information-aware...

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3rd International Conference on Computing, Communication, Perception and Quantum technology, CCPQT 2024

作者： Gao, Jie Wang, Jing Zhang, Ying Quality Manage Department Beijing Aerospace Automatic Control Institute Beijing China Projects Executive Office Equipment Integrated Logistics Support Center China Academy of Launch Vehicle Beijing China National Key Laboratory of Science and Technology on Aerospace Intelligent Beijing Aerospace Automatic Control Institute Peking University Beijing China

ISBN: (纸本)9798331528386

This paper applies the information-aware weight method to the field of engineering where the validity of the data characteristics of the prediction object fluctuates or changes rapidly within a limited range. It clarifies the relationship between point similarity and regional similarity, so that the online prediction algorithm has a more acute data characteristic perception ability in the process of responding to data characteristic changes, and can control the life and performance of the product in real time. The error compensation algorithm is based on the relevant theory of the prediction ability solidification after the prediction model training and the use of prior error to approximate the posterior error in the prediction process of the online extreme learning machine derivative algorithm. By establishing a mapping relationship between the input data and the prediction error of the IPW-OSELM algorithm, an error compensation algorithm is formed. Starting from the cost function theory, the IPW-OSELM algorithm effectively integrates multiple parameters such as forgetting factor, regularization parameter and information-aware weight, which improves the overall performance of the WE-OSELM algorithm online prediction and can effectively manage large systems. © 2024 IEEE.

关键词： Prediction models

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Degradation kinetics and disinfection by-products formation of benzophenone-4 during UV/persulfate process

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Environmental technology (United Kingdom) 2024年第26期45卷 5618-5629页

作者： Hu, Chen-Yan Xiong, Cun Lin, Yi-Li Zhang, Tian-Yang College of Environmental and Chemical Engineering Shanghai Engineering Research Center of Energy-Saving in Heat Exchange Systems Shanghai University of Electric Power Shanghai China Shanghai Institute of Pollution Control and Ecological Security Shanghai China Department of Safety Health and Environmental Engineering National Kaohsiung University of Science and Technology Kaohsiung Taiwan State Key Laboratory of Pollution Control and Resources Reuse Key Laboratory of Yangtze Water Environment Ministry of Education College of Environmental Science and Engineering Tongji University Shanghai China

The degradation kinetics, reaction pathways, and disinfection by-products formation of an organic UV filter, benzophenone-4 (BP4) during UV/persulfate oxidation were investigated. BP4 can hardly be degraded by UV alone, but can be effectively decomposed by UV/persulfate following pseudo-first order kinetics. BP4 degradation rate was enhanced with increasing persulfate dosage and decreasing pH from 8 to 5. However, the degradation rate of BP4 at pH 9 was higher than that at pH 8 because of the presence of phenolic group in BP4 structure. and (Formula presented.) were confirmed as the major contributors to BP4 decomposition in radical scavenging experiments, and the second-order rate constants between (Formula presented.) and BP4 as well as those between (Formula presented.) and BP4 were estimated by establishing and solving a kinetic model. The presence of (Formula presented.) and humic acid inhibited the decomposition of BP4, while (Formula presented.) promoted it. The mineralisation of BP4 was only 9.1% at the persulfate concentration of 50 μM. Six degradation intermediates were identified for the promulgation of the reaction pathways of BP4 during UV/persulfate oxidation were proposed as a result. In addition, the formation of DBP in the sequential chlorination was evaluated at different persulfate dosages, pH values, and water matrix. The results of this study can provide essential knowledge for the effective control of DBP formation with reducing potential hazard to provide safe drinking water to the public. © 2023 Informa UK Limited, trading as Taylor & Francis Group.

关键词： Rate constants

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A nano-sheet graphene-based enhanced thermal radiation composite for passive heat dissipation from vehicle batteries

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Nano Materials science 2024年第4期6卷 443-455页

作者： Ji-Xiang Wang Christopher Salmean Jiaxin Li Chaojie Lei Jun Li Mingliang Zhong Bo Qi Yufeng Mao Hebei Key Laboratory of Man-machine Environmental Thermal Control Technology and Equipment Hebei Vocational University of Technology and EngineeringHebei 054000PR China College of Electrical Energy and Power EngineeringYangzhou UniversityYangzhou225009PR China Department of Mechanical and Aerospace Engineering The Hong Kong University of Science and TechnologyKowloonHong Kong SARPR China China Academy of Launch Vehicle Technology Beijing100076PR China Beijing Sino-Spark Technology Co. Ltd.Beijing100191PR China School of Environmental Science and Engineering Suzhou University of Science and TechnologySuzhou215009PR China Institute of Optics and Electronics Chinese Academy of SciencesChengdu610209PR China National Key Laboratory of Optical Field Manipulation Science and Technology Chinese Academy of SciencesChengdu610209PR China Taizhou Wavexploration Energy Ltd. Taizhou225513PR China Department of Electrical and Computer Engineering University of TorontoTorontoM5S3G4Canada

In response to thermal runaway(TR)of electric vehicles,recent attention has been focused on mitigation strategies such as efficient heat dredging in battery thermal *** management with particular focus on battery cooling has been becoming increasingly *** usually happened when an electric vehicle is unpowered and *** this state,traditional active battery cooling schemes are disabled,which can easily lead to dangerous incidents due to loss of cooling ability,and advanced passive cooling strategies are therefore gaining ***,we developed an enhanced thermal radiation material,consisting of~1μm thick multilayered nano-sheet graphene film coated upon the heat dissipation surface,thereby enhancing thermal radiation in the *** surface was characterized on the nanoscale,and tested in a battery-cooling *** found that the graphene-based coating's spectral emissivity is between 91% and 95% in the mid-infrared region,and thermal experiments consequently illustrated that graphene-based radiative cooling yielded up to15.1% temperature reduction when compared to the uncoated *** the novel graphene surface to augment a heat pipe,the temperature reduction can be further enlarged to 25.6%.The new material may contribute to transportation safety,global warming mitigation and carbon neutralization.

关键词： Battery thermal management Nano-sheet graphene Functional material Passive cooling Thermal radiation

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Super-exchange effect induced by early 3d metal doping on NiFe_(2)O_(4)(001)surface for oxygen evolution reaction

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Journal of Energy Chemistry 2023年第3期78卷 21-29,I0002页

作者： Shuhao Wang Xinyan Liu Xiang Chen Kamran Dastafkan Zhong-Heng Fu Xin Tan Qiang Zhang Chuan Zhao School of Chemistry The University of New South WalesSydneyNSW 2052Australia Beijing Key Laboratory of Green Chemical Reaction Engineering and Technology Department of Chemical EngineeringTsinghua UniversityBeijing 100084China Institute of Fundamental and Frontier Sciences University of Electronic Science and Technology of ChinaChengdu 611731SichuanChina Integrated Materials Design Laboratory Department of Applied MathematicsResearch School of PhysicsThe Australian National UniversityCanberraACT 2601Australia

Understanding the intrinsic activity of oxygen evolution reaction(OER) is crucial for catalyst *** date,different metal-doping strategies have been developed to achieve this,but the involving mechanisms remain ***,the electronic structure of the transition metal-doped NiFe_(2)O_(4)(001) surface is scrutinized for OER intrinsic activity using density functional theory *** 3d-orbital filling metals(Ti,V,Cr,Mn,and Co) are introduced as dopants onto A-and B-layers of the NiFe_(2)O_(4)(001) surface,and variation of oxidation states over Fe sites is observed on *** the magnetic moment and charge transfer of surface cation sites reveals that the variation of Fe oxidation states originates from the super-exchange effect and is influenced by the t2g-electron configuration of 3d metal *** trend governs the generation of highly-active Fe3+sites on the B-layer,the adsorption strength of OER intermediates,i.e.,*O and*OH,and therefore the intrinsic *** finding of super-exchange mechanism induced by 3d early metal doping offers insights into electronic structure tailoring strategies for improving the intrinsic activity of OER electrocatalysts.

关键词： Oxygen evolution reaction NiFe spinel Oxidation states Super-exchange mechanism Density functional theory

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Research Progress and key technology Analysis in Cooperative control of Dual Robots 6

Research Progress and Key Technology Analysis in Cooperative...

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6th International Conference on Industrial Artificial Intelligence, IAI 2024

作者： Xu, Luwei Yan, Wenduan Sun, Yifang Kang, Quanjie Fu, Yue Institute of Advanced Manufacturing Fuzhou University Quanzhou362251 China Minnan University of Science and Technology Quanzhou362700 China Northeastern University National Key Laboratory of Integrated Automation for Process Industries Shenyang110819 China

ISBN: (纸本)9798350356618

To meet the intricate demands of modern industries, multi-robot cooperative control systems offer broad applications, robust fault tolerance, and high efficiency. This research proposes trajectory compensation and digital twin technology as remedies for challenging collaborative planning, low real-time and accuracy, limited model accuracy, and inadequate planning of complicated tasks in dual-robot cooperative control. Trajectory compensation has the potential to increase task efficiency, boost environmental adaptability, and maximize cooperative performance;digital twin technology is essential for real-time monitoring and prediction, cooperative control strategy optimization, fault diagnosis and prevention, and maintenance cost savings. © 2024 IEEE.

关键词： Robot programming

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Rotational random extraction of Toeplitz matrix for ghost imaging 4

Rotational random extraction of Toeplitz matrix for ghost im...

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4th International Conference on Optoelectronic science and Materials, ICOSM 2022

作者： Cheng, Zhengdong Sun, Maosheng Chen, Yi Chang, Haikuan Liu, Yanyan State Key Laboratory of Pulsed Power Laser Technology National University of Defense Technology Huangshan Road No.460 HeFei230037 China Science and Technology on Electro-Optical Information Security Control Laboratory Weiwu Road No.9 Tianjin300450 China

ISBN: (纸本)9781510662209

If Toeplitz matrix is used for compression-aware ghost imaging, the imaging quality will be very low. In order to solve the problem, a new experimental scheme for ghost imaging is proposed in this paper. The scheme first extracts the Toeplitz matrix elements randomly and sparsely using a revolving matrix, and then modulates the illumination light field. The sampling is performed by using the Toeplitz matrix as a fixed matrix and another measurement matrix as a revolving matrix. The revolving matrix rotates around its center at a constant angular velocity. The fixed Toeplitz matrix is superimposed with the revolving matrix to form the optical field modulation matrix. The results of simulation experiments show that light field modulation scheme of the rotational random extraction of Toeplitz matrix can modulate the light field with more randomness. The use of this scheme in ghost imaging experiments results in high quality images with low distortion. © 2023 SPIE. All rights reserved.

关键词： Matrix algebra

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Data quality assessment for studies investigating microplastics and nanoplastics in food products: Are current data reliable?

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Frontiers of Environmental science & Engineering 2023年第8期17卷 31-48页

作者： Lihua Pang Qianhui Lin Shasha Zhao Hao Zheng Chenguang Li Jing Zhang Cuizhu Sun Lingyun Chen Fengmin Li Institute of Coastal Environmental Pollution Control College of Environmental Science and EngineeringKey Laboratory of Marine Environment and Ecology(Ministry of Education)Ocean University of ChinaQingdao 266100China Sanya Oceanographic Institution Ocean University of ChinaSanya 572000China Marine Ecology and Environmental Science Laboratory Pilot National Laboratory for Marine Science and TechnologyQingdao 266071China Faculty of Agricultural Life and Environmental ScienceUniversity of AlbertaEdmonton T6G 2P5Canada

Data on the occurrence of microplastics and nanoplastics(MP/NPs)in foods have been used to assess the human health risk caused by the consumption of MP/*** reliability of the data,however,remains unclear because of the lack of international standards for the analysis of MP/NPs in ***,the data quality needs to be assessed for accurate health risk *** study developed 10 criteria applicable to the quality assessment of data on MP/NPs in ***,the reliability of 71 data records(69 of them only focused on MPs)was assessed by assigning a score of 2(reliable without restrictions),1(reliable but with restrictions),or 0(unreliable)on each *** results showed that only three data records scored 2 or 1 on all criteria,and six data records scored 0 on as many as six criteria.A total of 58 data records did not include information on positive controls,and 12 data records did not conduct the polymer identification,which could result in the overestimation or underestimation of MP/*** results also indicated that the data quality of unprocessed foods was more reliable than that of processed ***,we proposed a quality assurance and quality control protocol to investigate MP/NPs in ***,the characteristics of MP/NPs used in toxicological studies and those existing in foods showed a remarkable discrepancy,causing the uncertainty of health risk ***,both the estimated exposure of MP/NPs and the claimed potential health risks should be treated with caution.

关键词： Microplastic Nanoplastic Food products Data quality Human health risk

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General Simultaneous Localization and Mapping Scheme for mmWave Communication Systems

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IEEE Internet of Things Journal 2024年第12期11卷 22521-22536页

作者： Du, Tao Yang, Jie Wen, Chao-Kai Xia, Shuqiang Jin, Shi Southeast University National Mobile Communications Research Laboratory Nanjing210096 China Southeast University Key Laboratory Of Measurement And Control Of Complex Systems Of Engineering Ministry Of Education The Frontiers Science Center For Mobile Information Communication And Security Nanjing210096 China Institute Of Communications Engineering National Sun Yat-sen University Kaohsiung80424 Taiwan Zte Corporation The State Key Laboratory Of Mobile Network And Mobile Multimedia Technology Shenzhen518055 China Southeast University National Mobile Communications Research Laboratory The Frontiers Science Center For Mobile Information Communication And Security Nanjing210096 China

Utilizing high-resolution antenna arrays and wide bandwidth of the millimeter-wave (mmWave) spectrum in 5G new radio (NR) mmWave communication systems holds the potential for high-throughput data transmission while enabling user localization and environmental mapping. However, the majority of existing simultaneous localization and mapping (SLAM) algorithms rely on methods akin to the extended Kalman filter for generating initial map features. These methods prove ineffective when the measurement dimension is insufficient. Furthermore, there is a notable absence of research exploring mmWave prototype systems to evaluate and compare the performance and viability of various SLAM algorithms. To address these challenges, we propose an innovative probability hypothesis density (PHD) generation scheme for birth events and have developed a prototype system. Our approach, referred to as PHD-SLAM, exhibits remarkable effectiveness even in scenarios where the measurement dimension falls short of map features. This means it can function seamlessly with only delay or angle information available. Additionally, we have designed a 28GHz mmWave beam scanning prototype system that leverages the 5G NR frame for accomplishing SLAM algorithms. Following this, we conducted extensive simulations and experimental evaluations to gauge the performance of several leading-edge SLAM algorithms under diverse mmWave circumstances, encompassing PHD-based and belief propagation (BP) SLAM algorithms. Our analysis reveals that both PHD and BP SLAM can achieve agent localization precision within a decimeter and mapping precision within a meter, capitalizing on the angle parameters of mmWave signals. While BP SLAM showcases reduced computational demand, its estimation precision is marginally inferior to that of PHD-SLAM. © 2014 IEEE.

关键词： Belief propagation

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Review of X-ray pulsar spacecraft autonomous navigation

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Chinese Journal of Aeronautics 2023年第10期36卷 44-63页

作者： Yidi WANG Wei ZHENG Shuangnan ZHANG Minyu GE Liansheng LI Kun JIANG Xiaoqian CHEN Xiang ZHANG Shijie ZHENG Fangjun LU College of Aerospace Science and Engineering National University of Defense TechnologyChangsha 410073China Key Laboratory of Particle Astrophysics Institute of High Energy PhysicsChinese Academy of SciencesBeijing 100049China University of Chinese Academy of Sciences Chinese Academy of SciencesBeijing 100049China Beijing Institute of Control Engineering Beijing 100080China Beijing Institute of Tracking and Communication Technology Beijing 100091China Aerospace Information Research Institute Chinese Academy of ScienceBeijing 100091China Academy of Military Science Beijing 100091China National Innovation Institute of Defense Technology Academy of Military ScienceBeijing 100091China

This article provides a review on X-ray pulsar-based navigation(XNAV).The review starts with the basic concept of XNAV,and briefly introduces the past,present and future projects concerning *** paper focuses on the advances of the key techniques supporting XNAV,including the navigation pulsar database,the X-ray detection system,and the pulse time of arrival ***,the methods to improve the estimation performance of XNAV are ***,some remarks on the future development of XNAV are provided.

关键词： Estimation of pulse time of arrival Spacecraft autonomous navigation X-ray detection X-ray pulsar-based navigation X-ray pulsar signal processing

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