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design and analysis of active disturbance rejection control for time-delay systems using frequency-sweeping

Journal of Systems Engineering and Electronics 2023年第2期34卷 479-491页

作者： WANG Yongshuai CHEN Zengqiang SUN Mingwei SUN Qinglin College of Artificial Intelligence Nankai UniversityTianjin 300350China Key Laboratory of Intelligent Robotics of Tianjin Tianjin 300350China

For the typical first-order systems with time-delay,this paper explors the control capability of linear active disturbance rejection control(LAdrC).Firstly,the critical time-delay of LAdrC is analyzed using the frequency-sweeping method and the routh criterion,and the stable time-delay interval starting from zero is accurately obtained,which reveals the limitations of general LAdrC on large *** in view of the large time-delay,an LAdrC controller is developed and verified to be effective,along with the robustness ***,numerical simulations show the accuracy of critical time-delay,and demonstrate the effectiveness and robustness of the proposed controller compared with other modified LAdrCs.

关键词： active disturbance rejection control frequencysweeping method critical time-delay routh criterion system with large time-delay

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A novel lightweight computerized ECG interpretation approach based on clinical 12-lead data

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Science China(Technological Sciences) 2024年第2期67卷 449-463页

作者： LIU YunQing QIN ChengJin LIU JinLei JIN Yanrui LI ZhiYuan ZHAO LiQun LIU ChengLiang School of Mechanical Engineering Shanghai Jiao Tong UniversityShanghai 200240China Key Labof Artificial Intelligence(Ministryof Education) AI InstituteShanghai Jiao Tong UniversityShanghai 200240China Department of Cardiology Shanghai First Peoples Hospital Affiliated to Shanghai Jiao Tong UniversityShanghai 200080China

Although 12-lead electrocardiograms(ECGs)provide a wide range of spatiotemporal characteristics,interpreting them for arrhythmia detection is difficult due to a lack of reliable large-scale clinical ***,we proposed an innovative lightweight computerized ECG interpretation approach based on 12-lead *** model was trained,validated,and tested on 53845 standard 12-lead ECG records collected at Shanghai First People’s Hospital in affiliation with Shanghai Jiao Tong *** experiments revealed that our approach had a classification accuracy of 94.41%in the classification task of seven types of rhythms,which was markedly superior to related single-lead and 12-lead ECG classification ***,the average receiver operating characteristic area under the curve reached a value of 0.940,and the precision values for sinus tachycardia and sinus bradycardia were 0.945 and 0.91,respectively,with specificity values of 0.996 and *** employing our boosting method,we were able to improve the accuracy to 94.85%.To investigate the performance degradation of the proposed neural network in some classes,an ECG cardiologist was enlisted to review questionable ECGs;this process provides a promising direction for network performance ***,the proposed computerized ECG interpretation approach has practical significance because it could help professional physicians analyze patients’heart conditions based on real-time 12-lead ECG or grade their disease severity in advance.

关键词： computerized ECG interpretation large-scale 12-lead clinical ECG database lightweight neural network

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Supercritical/dense-phase CO2 pipeline leakage diffusion experiment and hazard distance prediction method

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JOUrNAL OF PIPELINE SCIENCE ANd ENGINEErING 2025年第2期5卷

作者： Wang, Yifei Hu, Qihui Zhao, Xuefeng Yin, Buze Meng, Lan Xin, Ouyang Cong, Siqi Nie, Chaofei Guo, Yaqi Li, Yuxing China Univ Petr East China Shandong Key Lab Oil & Gas Storage & Transportat S Qingdao 266580 Shandong Peoples R China Daqing Oilfield Design Inst Co Ltd Daqing 163453 Heilongjiang Peoples R China PipeChina Inst Sci & Technol Tianjin 300450 Peoples R China

The study of the diffusion characteristics of CO2 leakage in pipelines and the determination of the hazardous distance resulting from such leakage under various working conditions are crucial for identifying the highconsequence zone of industrial CO2 pipelines and analyzing the consequences of accidents. Currently, there is yet to be a unified conclusion on the delineation and calculation method of hazard distance. This paper has formulated hazard distance calculation and forecasting methods by combining test verification and model calculation. First, a full-scale pipe burst leakage experiment was carried out based on a self-designed and built CO2 pipe leakage device, the CO2 concentration data was measured, and the CO2 diffusion characteristics were analyzed. Then, the experimental measurement values were compared with the calculation results of the CO2 concentration calculation model to verify the reliability of the model. Furthermore, a hazard distance calculation model was introduced, which utilized bilinear interpolation and took into account time-weighted allowable concentrations. This model accurately determined the hazard distances caused by leaks at 11 specific locations along the pipeline. It was found that the location of the leak point can lead to significant differences in the classification of the hazard distance, so the development of a hazard distance prediction model is necessary. Eventually, a hazard distance prediction model was established based on the PSO-BP neural network. Six variables were selected as input parameters: CO2 temperature, pressure, density, position, and distance from the distance valve chamber. The hazard distance caused by a leak at 125 locations along the pipeline was predicted. The results showed that an increase in the transport distance or a location away from the valve chamber would lead to an increase in the hazard distance. At the same time, a CO2 leak in the supercritical state will not generate a hazard distance.

关键词： Leakage experiment Hazard distance calculation model Hazard distance prediction model CO2 concentration diffusion characteristics CO2 concentration calculation model

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Accurate prediction of magnetocaloric effect in NiMn-based Heusler alloys by prioritizing phase transitions through explainable machine learning

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rare Metals 2025年第1期44卷 639-651页

作者： Yi-Chuan Tang Kai-Yan Cao ruo-Nan Ma Jia-Bin Wang Yin Zhang dong-Yan Zhang Chao Zhou Fang-Hua Tian Min-Xia Fang Sen Yang School of Physics Xi’an Jiaotong UniversityXi’an710049China Key Laboratory of Micro-Systems and Micro-Structures School of Advanced Materials and Nanotechnology Xidian UniversityXi’an710126China

With the rapid development of artificial intelligence,magnetocaloric materials as well as other materials are being developed with increased efficiency and enhanced ***,most studies do not take phase transitions into account,and as a result,the predictions are usually not accurate *** this context,we have established an explicable relationship between alloy compositions and phase transition by feature imputation.A facile machine learning is proposed to screen candidate NiMn-based Heusler alloys with desired magnetic entropy change and magnetic transition temperature with a high accuracy r^(2)≈*** expected,the measured properties of prepared NiMn-based alloys,including phase transition type,magnetic entropy changes and transition temperature,are all in good agreement with the ML *** well as being the first to demonstrate an explicable relationship between alloy compositions,phase transitions and magnetocaloric properties,our proposed ML model is highly predictive and interpretable,which can provide a strong theoretical foundation for identifying high-performance magnetocaloric materials in the future.

关键词： NiMn-based Heusler materials Phase transition-type Machine learning Magnetocaloric effect Composition design

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AB_(2)-type rare earth-based compounds with C-15 structure:Looking for reversible hydrogen storage materials

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Journal of rare Earths 2024年第5期42卷 803-816,I0001页

作者： Hao Shen Junxian Zhang Valerie Paul-Boncour Ping Li Zhinian Li Yuanfang Wu Lijun Jiang National Engineering Research Center of Nonferrous Metals Materias and Products for New Energy GRINM Group Co.LtdBeijing00088China Univ Paris Est Creteil CNRSICMPEUMR 71822 rue Henri Dunant94320ThiaisFrance Institute for Advanced Materials and Technology University of Science and TechnologyBeijing100083China GRIMAT Engineering Institute Co. Ltd.Beijing101407China

AB_(2)-type(A=rare earth,B=transition metal)intermetallic compounds with C15 structure can easily absorb large amount of hydrogen,showing their potential use as hydrogen storage *** crucial problem hindering their application is hydrogen induced amorphization(HIA),which leads to the irreversible hydrogen sorption *** stability of the AB_2 Laves phase compounds,the structural properties,the hydrogenation properties and the controlling factors of HIA are discussed in this *** with other factors,the atomic radii ratio r_A/r_B is the most important one influencing the ***-element substitution is an efficient way to suppress or limit HIA and may enable AB_2 compounds to be suitable for hydrogen storage.

关键词： rare earth-based AB_2-type compounds Hydrogenation properties Hydrogen induced amorphization Elemental substitution

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Comprehensive Treatment Uncertainty Analysis and PTV Margin Estimation for Fiducial Tracking in robotic Liver Stereotactic Body radiation Therapy

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Current Medical Science 2023年第3期43卷 572-578页

作者： Zhi-wen LIANG Meng-lan ZHAI Biao TU Xin NIE Xiao-hui ZHU Jun-ping CHENG Guo-quan LI dan-dan YU Tao ZHANG Sheng ZHANG Cancer Center Union HospitalTongji Medical CollegeHuazhong University of Science and TechnologyWuhan 430022China

Objective This study aims to quantify the uncertainties of CyberKnife Synchrony fiducial tracking for liver stereotactic body radiation therapy(SBrT)cases,and evaluate the required planning target volume(PTV)*** A total of 11 liver tumor patients with a total of 57 fractions,who underwent SBrT with synchronous fiducial tracking,were enrolled for the present *** correlation/prediction model error,geometric error,and beam targeting error were quantified to determine the patient-level and fraction-level individual composite treatment *** composite uncertainties and multiple margin recipes were compared for scenarios with and without rotation correction during *** The correlation model error-related uncertainty was 4.3±1.8,1.4±0.5 and 1.8±0.7 mm in the superior-inferior(SI),left-right,and anterior-posterior directions,*** were the primary contributors among all uncertainty *** geometric error significantly increased for treatments without rotation *** fraction-level composite uncertainties had a long tail ***,the generally used 5-mm isotropic margin covered all uncertainties in the left-right and anterior-posterior directions,and only 75%of uncertainties in the SI *** order to cover 90%of uncertainties in the SI direction,an 8-mm margin would be *** scenarios without rotation correction,additional safety margins should be added,especially in the superior-inferior and anterior-posterior *** The present study revealed that the correlation model error contributes to most of the uncertainties in the *** patients/fractions can be covered by a 5-mm *** with large treatment uncertainties might need a patient-specific margin.

关键词： CyberKnife fiducial tracking liver cancer stereotactic body radiation therapy margin expansion

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Macroscopically uniform interface layer with Li⁺ conductive channels for high-performance Li metal batteries

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NATUrE COMMUNICATIONS 2024年第1期15卷 10045页

作者： Chen, Qian Gao, Binyin Yang, Zhilin Li, Yong Zhai, Qingwei Jia, Yangyu Zhang, Qiannan Gu, Xiaokang Zuo, Jinghan Wang, Lei Wang, Tianshuai Zhai, Pengbo Yang, Cheng Gong, Yongji Tianmushan Lab Hangzhou 311115 Peoples R China Beihang Univ Sch Mat Sci & Engn Beijing 100191 Peoples R China 1 Unit 63963 PLA Beijing 100191 Peoples R China Shanghai Inst Space Power Sources State Key Lab Space Power Sources Shanghai 200000 Peoples R China Jinan Zhongruitai New Mat Technol Co LTD Jinan 250300 Peoples R China Northwestern Polytech Univ Sch Chem & Chem Engn Xian 710129 Peoples R China Beihang Univ Ctr Micronano Innovat Beijing 100029 Peoples R China Key Lab Intelligent Sensing Mat & Chip Integrat Te Hangzhou 310051 Peoples R China

The numerous grainboundaries solid electrolyte interface, whether naturally occurring or artificially designed, leads to non-uniform Li metal deposition and consequently results in poor full-battery performance. Herein, a lithium-ion selective transport layer is reported to achieve a highly efficient and dendrite-free lithium metal anode. The layer-by-layer assembled protonated carbon nitride nanosheets present uniform macroscopical structure without grainboundaries. The carbon nitride with ordered pores in basal plane provides high-speed lithium-ion transport channels with low tortuosity. Consequently, the assembled 324 Wh kg-1 pouch cell exhibits 300 stable cycles with a capacity retention of 90.0% and an average Coulombic efficiency up to 99.7%. The ultra-dense Li metal anode makes current collector-free anode possible, achieving high energy density and long cycle life of a 7 Ah cell (506 Wh kg-1, 160 cycles). Thus, it is proved that a macroscopically uniform interface layer with lithium-ion conductive channels could achieve Li metal battery with promising application potential. Here, authors report a macroscopical grain boundary-free interface layer with microscopic Li + -selective conductive channels enables the ultra-dense Li metal deposition, resulting in a high energy density (506 Wh kg-1) and long cycle life (160 cycles) pouch cell performance.

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Optical Spiral Predator-Prey dynamics

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Chinese Physics Letters 2025年第2期42卷 48-66页

作者： Juan Wu Yu-Hui Zhuang Yi Hu Jing-Jun Xu The MOE Key Laboratory of Weak-Light Nonlinear Photonics TEDA Applied Institute and School of PhysicsNankai UniversityTianjin 300457China

Chase-and-escape motion,which is a typical behavior between a predator and prey,is an important dynamics in animate *** has been concerned recently in optics aiming for achieving novel light steering and switching ***,this optical counterpart can be realized in only one dimension because of the challenges in maintaining the chase-and-escape ***,we report,both theoretically and experimentally,the optical predator-prey dynamics in two dimensions for the first *** nonreciprocal interaction,two beams can form a localized or oblique spiral chase-and-escape motion,which persists owing to the mutual light *** optical phenomena are observed in these dynamics:the angular momentum is not conserved and the resulting transverse traveling motion can be opposite to the applied initial momentum and enhanced by increasing the internal light *** results can inspire further fundamental studies by exploring analogous animate phenomena in optics that are potentially useful for developing optical intelligence functions.

关键词： functions interaction. momentum

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pH-sensitive KHA/CMC-Fe^(3+)@CS hydrogel loading and the drug release properties of riboflavin

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Particuology 2024年第3期86卷 13-23页

作者： Jie Song Xi Li Yuhua Niu Lijun Chen Zhiqiang Wei Yidan Li Youqian Wang Shaanxi University of Science&Technology Xi'an710021China

To improve drug utilization,reduce the drug administration frequency,increase the release time,and reduce the drug side effects in the human body,we prepared(KHA/CMC-Fe^(3+))@CS hydrogel spheres using green and natural potassium humate(KHA),carboxymethyl cellulose(CMC),and chitosan(CS)as raw materials and Fe3+as a crosslinking agent,and loaded them with riboflavin for drug sustainedrelease study using the drop ball *** tests with FTIr,SEM,TG,and X-ray diffractometer showed that the coordination among KHA,CMC,and Fe^(3+)formed a three-dimensional network structure,where cs was encapsulated on the surface of the hydrogel spheres via noncovalent bonding,resulting in good thermal *** stability,drug loading,swelling,and in vitro release of the(KHA/CMC-Fe^(3+))@CS hydrogel spheres were *** results showed that the hydrogel spheres were significantly pH-sensitive,with 11.16 g/g higher swelling in an alkaline environment(pH=7.4)than that in an acidic environment(pH=1.2).The swelling and drug release process of the hydrogel spheres were analyzed using mathematical models,concluding that the hydrogel swelling follows Schott second-order swelling kinetics,and the drug release mechanism was Fickian delivery mode.

关键词： Potassium humate Hydrogel spheres pH-sensitive drugsustained-release drug release model

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Self-healing of active site in Co(OH)_(2)/MXene electrocatalysts for hydrazine oxidation

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Journal of Materials Science & Technology 2024年第36期203卷 108-117页

作者： Kun Xiang Yongjing Wang Zechao Zhuang Jing Zou Neng Li dingsheng Wang Tianyou Zhai Jizhou Jiang School of Environmental Ecology and Biological Engineering School of Chemistry and Environmental EngineeringKey Laboratory of Green Chemical Engineering Process of Ministry of EducationEngineering Research Center of Phosphorus Resources Development and Utilization of Ministry of EducationNovel Catalytic Materials of Hubei Engineering Research CenterWuhan Institute of TechnologyWuhan 430205China Department of Chemistry Tsinghua UniversityBeijing 100084China State Key Laboratory of Silicate Materials for Architectures Wuhan University of TechnologyWuhan 430070China State Key Laboratory of Material Processing and Die&Mould Technology School of Materials Science and EngineeringHuazhong University of Science and TechnologyWuhan 430074China

The development of efficient hydrazine oxidation reaction(HzOr)catalysts is important for the construc-tion of remarkable energy storage and conversion ***,after a period of electrochemical reaction,the active site of the catalyst will be irreversibly reduced or inactivated,and how to recover the active site is a major ***,we report 2d Co(OH)_(2)/Ti_(3)C_(2)(OH)_(x)MXene composites with rapid re-construction and self-healing behaviors as efficient and stable electrocatalysts during HzOr *** experimental and theoretical results indicate that the introduction of Ti_(3)C_(2)(OH)_(x)MXene can effectively reduce the dehydrogenation barrier of Co(OH)_(2),from 0.584 eV to 0.481 eV to form the real catalytic active center Co(OH)***,Co(OH)O/Ti_(3)C_(2)(OH)_(x)MXene composites with metal-like conductiv-ity not only present spontaneous adsorption capacity of N_(2)H_(4),but also can modulated rate-determining step of dehydrogenation of∗N_(2)H_(4)to∗N_(2)H_(3)(0.54 eV)compared with Co(OH)***,the electrophilic oxygen of Co(OH)O/Ti_(3)C_(2)(OH)_(x)can spontaneously obtain electrons and protons from N_(2)H_(4),achieving the oxidation of N_(2)H_(4)while reducing Co(OH)O to Co(OH)_(2),thus completing the self-healing of the efficient catalyst.

关键词： Hydrazine oxidation Self-healing reconstruction Co(OH)_(2)/MXene Electrocatalysis

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