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Adaptive observer-based integral event-triggered antivibration control of a full aircraft active landing gear system with irregular runway excitations

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Science China(Information Sciences) 2024年第6期67卷 248-261页

作者： Wenxiao HU Chenglong DU Fanbiao li Xinmin CHEN chunhua YANG Weihua GUI School of Automation Central South University Research Center in System Engineering for Special Aircrafts Ningbo Institute of Materials Technology and EngineeringChinese Academy of Sciences

This study addresses the antivibration issue of a full aircraft active landing gear system(LGS)under landing impact and runway excitations via a novel adaptive observer-based integral event-triggered control method. First, a full aircraft active LGS comprising a front gear and two synchronized main left and right gears with active suspensions is established, where the information exchange among them is not implemented directly. Second, two adaptive observers are designed separately for the front and main LGSs to identify the varying damping parameters and estimate the system states simultaneously. Third, estimated states are transmitted to a shared network through a novel integral event-triggered mechanism(I-ETM);thus, the front and main LGSs are interconnected, and a networked control scheme for the aircraft LGS is constructed. Additionally, the integrated active control law is designed with the aid of the transmitted states of the front and main LGSs, enhancing the robustness against the pitch vibration of the aircraft.Furthermore, the L2-stability of the hybrid system is guaranteed to depress the vertical vibration effect of the landing impact and irregular runway excitations, thus improving passenger safety and comfort. Moreover,a codesign method is provided to obtain feasible solutions to the gain matrices of the observers and controllers simultaneously. Simulation and comparison results are presented to illustrate the effectiveness and superiority of the proposed control scheme in antivibration and saving communication resources.

关键词： aircraft active landing gear antivibration control integral event-triggered mechanism adaptive observer ${\mathcal{L}}_2$-stability

Extending the solid solution range of sodium ferric pyrophosphate:Off‐stoichiometric Na_(3)Fe(2.5)(P_(2)O_(7))_(2)as a novel cathode for sodium‐ion batteries

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Carbon Energy 2024年第4期6卷 128-139页

作者： Xiang jun Pu Kunran Yang Zibing Pan chunhua Song Yangyang Lai Renjie li Zheng‐Long Xu Zhongxue Chen Yuliang Cao Hubei Key Laboratory of Electrochemical Power Sources College of Chemistry and Molecular SciencesWuhan UniversityWuhanChina Key Laboratory of Hydraulic Machinery Transients Ministry of EducationSchool of Power and Mechanical EngineeringWuhan UniversityWuhanChina School of Chemistry and Chemical Engineering Jiangsu University of TechnologyChangzhouJiangsuChina Zonergy Corporation ZigongSichuanChina Department of Industrial and Systems Engineering The Hong Kong Polytechnic UniversityHung HomHong Kong SARChina

Iron‐based pyrophosphates are attractive cathodes for sodium‐ion batteries due to their large framework,cost‐effectiveness,and high energy density.However,the understanding of the crystal structure is scarce and only a limited candidates have been reported so far.In this work,we found for the first time that a continuous solid solution,Na_(4−α)Fe_(2+α)_(2)(P_(2)O_(7))_(2)(0≤α≤1,could be obtained by mutual substitution of cations at center‐symmetric Na3 and Na4 sites while keeping the crystal building blocks of anionic P2O7 unchanged.In particular,a novel off‐stoichiometric Na_(3)Fe(2.5)(P_(2)O_(7))_(2)is thus proposed,and its structure,energy storage mechanism,and electrochemical performance are extensively investigated to unveil the structure–function relationship.The as‐prepared off‐stoichiometric electrode delivers appealing performance with a reversible discharge capacity of 83 mAh g^(−1),a working voltage of 2.9 V(vs.Na^(+)/Na),the retention of 89.2%of the initial capacity after 500 cycles,and enhanced rate capability of 51 mAh g^(−1)at a current density of 1600 mA g^(−1).This research shows that sodium ferric pyrophosphate could form extended solid solution composition and promising phase is concealed in the range of Na_(4−α)Fe_(2+α)_(2)(P_(2)O_(7))_(2),offering more chances for exploration of new cathode materials for the construction of high‐performance SIBs.

关键词： extending solid‐solution range off‐stoichiometric Na_(3)Fe_(2.5)(P_(2)O_(7))_(2) sodium‐ion batteries structure-function relationship

The spatial transcriptomic landscape of human gingiva in health and periodontitis

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Science China(life Sciences) 2024年第4期67卷 720-732页

作者： Zongshan Shen Ran Zhang Yunjia Huang Jiayao Chen Mengjun Yu chunhua li Yong Zhang lingling Chen Xin Huang Jichen Yang Zhengmei lin Songlin Wang Bin Cheng Hospital of Stomatology Guangdong Provincial Key Laboratory of StomatologyGuanghua School of StomatologySun Yat-sen UniversityGuangzhou 510055China Beijing Laboratory of Oral Health Capital Medical UniversityBeijing 100050China Department of Oral Pathology Peking University School and Hospital of Stomatology&National Center of Stomatology&National Clinical Research Center for Oral Diseases&National Engineering Research Center of Oral Biomaterials and Digital Medical DevicesBeijing 100050China Research Unit of Precision Pathologic Diagnosis in Tumors of the Oral and Maxillofacial Regions Chinese Academy of Medical SciencesBeijing 100050China BGI-Qingdao BGI-ShenzhenQingdao 266555China

The gingiva is a key oral barrier that protects oral tissues from various stimuli.A loss of gingival tissue homeostasis causes periodontitis,one of the most prevalent inflammatory diseases in humans.The human gingiva exists as a complex cell network comprising specialized structures.To understand the tissue-specific pathophysiology of the gingiva,we applied a recently developed spatial enhanced resolution omics-sequencing(Stereo-seq)technique to obtain a spatial transcriptome(ST)atlas of the gingiva in healthy individuals and periodontitis patients.By utilizing Stereo-seq,we identified the major cell types present in the gingiva,which included epithelial cells,fibroblasts,endothelial cells,and immune cells,as well as subgroups of epithelial cells and immune cells.We further observed that inflammation-related signalling pathways,such as the JAK-STAT and NF-κB signalling pathways,were significantly upregulated in the endothelial cells of the gingiva of periodontitis patients compared with those of healthy individuals.Additionally,we characterized the spatial distribution of periodontitis risk genes in the gingiva and found that the expression of IFI16 was significantly increased in endothelial cells of inflamed gingiva.In conclusion,our Stereo-seq findings may facilitate the development of innovative therapeutic strategies for periodontitis by mapping periodontitis-relevant genes and pathways and effector cells.

关键词： spatial transcriptomics gingiva periodontal disease periodontitis risk genes

Nitrogen air lasing induced by multiple filaments array

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Optoelectronics Letters 2022年第6期18卷 354-359页

作者： ZHU Di li chunhua GAO Zhongkun SUN Xiaodong GAO Hui Tianjin Key Laboratory of Optoelectronic Detection Technology and Systems Tianjin 300387China School of Electronics and Information Engineering Tiangong UniversityTianjin 300387China School of life Science Tiangong UniversityTianjin 300387China School of Physical Science and Technology Tiangong UniversityTianjin 300387China

Air lasing emission by launching intense ultrafast laser pulses in atmosphere has recently attracted increasing interest in the ultrafast laser science and atmospheric science fields,especially for remote sensing techniques.We demonstrated the fluorescence emissions at 337 nm,357 nm and 391 nm induced by multiple filaments using four kinds of step phase plates.Our results have indicated that the fluorescence signal has been amplified as it propagates along the filament through amplified spontaneous emission(ASE),and the fluorescence intensity is also enhanced in the backward direction via multiple filaments.Furthermore,the gain coefficient through ASE is increased with the number of filaments.

关键词： lasing multiple backward

Formulation of Work-Study Combined and Result-Oriented Integrated Curriculum Standards

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Medicinal Plant 2024年第3期15卷 79-83页

作者： lianfang li chunhua DU Fen YANG Yun li Yanfei NIU Yunnan Technician College(Yunnan Industry Trade Vocational College) Kunming 650300China Yunnan Baiyao Group Traditional Chinese Medicine Resources Co. Ltd.Kunming 650300China

According to the Annex Technical Regulations for Integrated Curriculum Development(Trial)in Document No.30 of the General Office of the Ministry of Human Resources and Social Security(2012),this paper studies the formulation of the curriculum standards for the integration of Chinese medicinal materials production.We focus on the formulation ideas of the curriculum standards for the integration of Chinese medicinal materials production,the formulation process of the curriculum standards for the integration of Chinese medicinal materials production,including the description of typical work tasks,the determination of curriculum objectives,the analysis of study content,the description of referential study tasks,teaching implementation suggestions,assessment and evaluation suggestions,which can provide a reference for the development and research of other related integrated courses.

关键词： Integration of work and study Work process Curriculum standards Production of Chinese medicinal materials Typical work tasks Referential study tasks

Application Value of NLR,PLR,LMR,HEART score,and POCT in Early Warning and Accurate Graded Diagnosis of High-Risk Chest Pain in Emergency Medicine

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Journal of Clinical and Nursing Research 2024年第4期8卷 93-98页

作者： Shaochang Ma chunhua lin Yanmei li Yan Chen Guohui Zhang Guandu District People’s Hospital Kunming 650200Yunnan ProvinceChina Guanshang Street Health Service Center Guandu DistrictKunming 650200Yunnan ProvinceChina

Objective: To evaluate the application value of neutrophils/lymphocytes (NLR), platelets/lymphocytes (PLR), lymphocytes/monocytes (LMR), HEART (history, electrocardiogram, age, risk factors, and troponin) score, and point-of- care testing (POCT) in the early warning and precise diagnosis of high-risk chest pain in emergency medicine. Methods: A total of 157 patients with acute chest pain who were admitted to the emergency department and chest pain treatment unit of our hospital between August 2022 and September 2023 were selected. Rapid testing of bedside myocardial markers (ultrasensitive troponin (hs-cTnI), myoglobin (MYO), creatine kinase isoenzyme (CK-MB), D-dimer (D-Dimer), and N-terminal B-type natriuretic peptide precursor (NT-proBNP)) was performed on the patients using a POCT device (ThermoKing BioMQ60proB). A HEART score was used to classify the patients into low (n = 53), intermediate (n = 59), and high-risk (n = 45) groups, and the NLR, PLR, and LMR were calculated. The NLR, PLR, and LMR values were compared among the three groups of patients, and the optimal cutoff values as well as sensitivity and specificity were determined based on receiver operating characteristic (ROC) analysis. Results: The HEART scores of patients in the low-risk, intermediate-risk, and high-risk groups were (2.72 ± 0.24), (4.75 ± 0.56), and (5.32 ± 0.73) respectively, and the differences were statistically significant (P lication of NLR, PLR, LMR, HEART s

关键词： NLR PLR LMR POCT myocardial markers HEART score Emergency high-risk chest pain

High Temperature Rheological Performance of Graphene Modified Rubber Asphalt

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Research and Application of Materials Science 2024年第1期6卷 9-15页

作者： Heyuan GUO chunhua li Xin ZHAO Yinghua YUAN Shaoqi TANG Yongjun MENG GuangXi Vocational College of Safety Engineering NanningGuangxi530004China College of Civil Engineering and Architecture Guangxi UniversityNanningGuangxi530004China

To elucidate the high temperature rheological capability of graphene modified rubber asphalt,three contents of graphene and crumb rubber were prepared by a combination of mechanical agitation and high speed shearing machine,then used dynamic shear rheological test(DSR)and multiple stress creep recovery(MSCR)tests to evaluate.The hardness and softening point with rotational viscosity of samples raised with the addition of graphene,especially the addition of 0.04%.Dynamic shear rheological test revealedthat the dynamic shear modulus G*,rutting factor G*/Sin δ,and zero shear viscosity(ZSV)of graphene-modified rubber asphalt were greatly influenced along with graphene-increased,on the contrary,phase angle δ which characterize the viscoelastic ratio of asphalt decreased.Multiple stress creep recovery(MSCR)tests showed that the graphene-enhanced rubber asphalt had high-temperature stability through non-recoverable creep compliance(Jnr).Based on these findings,graphene-modified rubber asphalt binders with the addition of 0.04% graphene had good viscoelastic properties as well as high temperature rutting resistance performance.In the meantime,G*/Sin δ,ZSV,and Jnr100,Jnr3200 have good correlation,which can reveal the excellent high-temperature stability performance of asphalt.

关键词： Graphene High Temperature rheological properties MSCR Zero shear viscosity Rutting

Cryptanalysis of an Encryption Scheme Using Matrices over Finite Fields

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Chinese Journal of Electronics 2018年第2期27卷 292-296页

作者： HUANG Huawei DENG Lunzhi li chunhua PAN chunhua School of Mathematical Sciences Guizhou Normal University School of Science East China Jiaotong University College of Mathematics and Information Science South China Agricultural University

This paper presents an attack on an encryption scheme proposed by Pei et al. using matrices over finite fields in 2010. The public information allows the derivation of a system of polynomial equations for the equivalent secret key. By the equivalent secret key, the plaintexts of the encryption scheme can be obtained by the public key and the ciphertexts without the secret key.

关键词： Ergodic matrix Public-key cryptography Computational complexity Algorithms Finite Field

基于晶闸管的模块化组合式直流泄能装置及其协调控制策略

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中国电机工程学报 2024年第10期44卷 3836-3849,I0008页

作者：郭春义李佳硕李春华新能源电力系统国家重点实验室(华北电力大学) 北京市昌平区102206 中国华能集团清洁能源技术研究院有限公司北京市昌平区102209

针对模块化多电平换流器(modular multilevel converter,MMC)高压直流输电技术(high voltage direct current,HVDC)受端交流系统故障引起的直流过电压问题,文中提出一种基于晶闸管的模块化组合式直流泄能装置拓扑及协调控制方法。该直... 详细信息

针对模块化多电平换流器(modular multilevel converter,MMC)高压直流输电技术(high voltage direct current,HVDC)受端交流系统故障引起的直流过电压问题,文中提出一种基于晶闸管的模块化组合式直流泄能装置拓扑及协调控制方法。该直流泄能拓扑包括模块化分布式泄能部分、限流电抗器和集中式泄能电阻3部分,对子模块工作模式进行设计,提出可避免直流泄能装置反复投切的弹性调节泄能的协调控制策略,推导直流泄能装置功率控制及其内部电气耦合关系,给出泄能装置元件参数的设计方法。最后,基于PSCAD/EMTDC搭建MMC-HVDC及所提出的直流泄能装置模型,研究单相和三相接地故障下直流泄能装置的特性及直流过电压抑制效果。结果表明,所提直流泄能装置在协调控制策略下能够分阶段弹性调节泄能功率,有效抑制直流过电压,并有利于故障后的快速恢复。

关键词：模块化多电平换流器高压直流输电系统直流泄能装置直流过电压抑制模块化组合协调控制