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Linear-quadratic optimal control for time-varying descriptor systems via space decompositions

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The Journal of China Universities of Posts and Telecommunications 2023年第6期30卷 38-48页

作者： LüPengchao huang junjie Liu Bo School of Mathematical Sciences Inner Mongolia UniversityHohhot 010021China Ministry of Education Key Laboratory for Intelligent Analysis and Security Governance of Ethnic Languages Minzu University of ChinaBeijing 100081China

This paper aims at solving the linear-quadratic optimal control problems(LQOCP)for time-varying descriptor systems in a real Hilbert *** using the Moore-Penrose inverse theory and space decomposition technique,the descriptor system can be rewritten as a new differential-algebraic equation(DAE),and then some novel sufficient conditions for the solvability of LQOCP are ***,the methods proposed in this work are simpler and easier to verify and compute,and can solve LQOCP without the range inclusion *** addition,some numerical examples are shown to verify the results obtained.

关键词： linear-quadratic optimal control problem(LQOCP) time-varying descriptor system Moore-Penrose inverse space decomposition

Spectral Inclusion Properties of Unbounded Hamiltonian Operators

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Chinese Annals of Mathematics,Series B 2015年第2期36卷 201-212页

作者： Yaru QI junjie huang Alatancang CHEN College of Sciences Inner Mongolia University of Technology School of Mathematical Sciences Inner Mongolia University Hohhot University for Nationalities

In this paper, the authors investigate the spectral inclusion properties of the quadratic numerical range for unbounded Hamiltonian operators. Moreover, some examples are presented to illustrate the main results.

关键词： Hamiltonian operator Spectrum Quadratic numerical range

Enhanced active site extraction from perovskite LaCoO_(3) using encapsulated PdO for efficient CO_(2) methanation

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Journal of Energy Chemistry 2021年第2期30卷 9-19,I0001页

作者： Kuncan Wang Wen Li junjie huang Jiale huang Guowu Zhan Qingbiao Li Department of Chemical and Biochemical Engineering College of Chemistry and Chemical EngineeringNational Laboratory for Green Chemical Productions of AlcoholsEthers and EstersKey Lab for Chemical Biology of Fujian ProvinceXiamen UniversityXiamen 361005FujianChina Department of Ecological Engineering for Environmental Sustainability College of the Environment&EcologyXiamen UniversityXiamen 361102FujianChina College of Chemical Engineering Huaqiao UniversityXiamen 361021FujianChina College of Food and Biology Engineering Jimei UniversityXiamen 361021FujianChina

The extraction of metallic nanoparticles from perovskite-type oxides(ABO_(3)) under mild reducing conditions is a novel way to prepare well-dispersed supported catalysts(B/AOd). Herein, we found that the encapsulated PdO in perovskite LaCoO_3(PdO@LaCoO_3) could facilitate the phase transformation of the perovskite structure at a low temperature owing to both strong H2 spillover of Pd and intimate interaction between the encapsulated PdO and LaCoO_(3). The pure LaCoO_(3) without PdO was relatively inert to CO_(2) hydrogenation(CO_(2) conversion 99% CH4 selectivity. The characterization results demonstrated that the catalytically active Co2 C was in-situ formed by carburization of the extracted Co0 during CO_(2) methanation for the PdO@LaCoO_(3) sample. Whereas, the LaCoO_(3) with surface supported PdO(PdO/LaCoO_(3)) showed a weak interaction and remained a perovskite structure with few Co_(2)C active centers after the catalytic reaction, which was similar to the parent LaCoO_(3). Accordingly, the PdO/LaCoO_(3) showed an inferior catalytic performance with 31.8% CO_(2) conversion and 87.4% CH_(4) selectivity. Therefore, the designed encapsulation structure of PdO within perovskite is critical to extract metallic NPs from perovskite-type oxides, which has the potential to prepare other integrated nanocatalysts based on perovskite-type oxides.

关键词： Perovskite reduction PdO nanoparticles Encapsulated structure Supported catalyst CO_(2)methanation

Analgesic effect of intrathecal bumetanide is accompanied by changes in spinal sodium-potassium-chloride co-transporter 1 and potassium-chloride co-transporter 2 expression in a rat model of incisional pain

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Neural Regeneration Research 2014年第10期9卷 1055-1062页

作者： Yanbing He Shiyuan Xu junjie huang Qingjuan Gong Department of Anesthesiology Zhujiang HospitalSouthern Medical University Department of Anesthesiology and Pain Medicine the Second Affiliated Hospital of Guangzhou Medical University

Accumulating evidence has demonstrated that the sodium-potassium-chloride co-transporter 1 and potassium-chloride co-transporter 2 have a role in the modulation of pain transmission at the spinal level through chloride regulation in the pain pathway and by effecting neuronal excitability and pain sensitization. The present study aimed to investigate the analgesic effect of the speciifc sodium-potassium-chloride co-transporter 1 inhibitor bumetanide, and the change in spinal sodium-potassium-chloride co-transporter 1 and potassium-chloride co-transporter 2 expression in a rat model of incisional pain. Results showed that intrathecal bumetanide could decrease cumulative pain scores, and could increase thermal and mechanical pain thresholds in a rat model of incisional pain. Sodium-potassium-chloride co-transporter 1 expression in-creased in neurons from dorsal root ganglion and the deep laminae of the ipsilateral dorsal horn following incision. By contrast, potassium-chloride co-transporter 2 expression decreased in neurons of the deep laminae from the ipsilateral dorsal horn. These ifndings suggest that spinal sodium-potassium-chloride co-transporter 1 expression was up-regulated and spinal potassi-um-chloride co-transporter 2 expression was down-regulated following incision. Intrathecal bumetanide has analgesic effects on incisional pain through inhibition of sodium-potassi-um-chloride co-transporter 1.

关键词： nerve regeneration sodium-potassium-chloride co-transporter 1 potassium-chloride co-transporter 2 bumetanide spinal cord dorsal root ganglion incision model postoperative pain neural regeneration

Effects of basic fibroblast growth factor on superoxide dismutase activity and malondialdehyde content in the rat brain following intracerebral hemorrhage

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Neural Regeneration Research 2008年第9期3卷 971-974页

作者： Hongqiao Wei Juen huang junjie huang Bing Li Qianming Li Department of Physiology Guangxi Medical University Nanning 530021 Guangxi Zhuang Autonomous Region China Department of Histology and Embryology Guangxi Medical University Nanning 530021 Guangxi Zhuang Autonomous Region China Department of Physiology Youjiang Medical College for Nationafities Baise 533000 Guangxi Zhuang Autonomous Region China Department of Physiology Xinxiang Medical College Xinxiang 453000 He＇nan Province China

BACKGROUND： Studies have confirmed that basic fibroblast growth factor （bFGF） promotes neuronal survival and neurite outgrowth. OBJECTIVE： To compare and verify the effects of bFGF on superoxide dismutase activity and malondialdehyde content in rat brain tissues surrounding a hemorrhagic lesion, as well as the hippocampus at the hemorrhagic side. DESIGN, TIME AND SETTING： The randomized, controlled, neurobiological study was performed at the Science Experimental Center and Research Laboratory, Guangxi Medical University, China, from September to December 2006. MATERIALS： Ninety-two adult, healthy, Wistar rats of equal gender were used to establish intracerebral hemorrhage by infusing type VII collagenase into the left internal capsule. Type Ⅶ collagenase （Sigma, USA）, superoxide dismutase and malondialdehyde kits （Jiancheng, China）, and bFGF （Institute of Bioengineering, Ji＇nan University, China） were used for this study. METHODS： Ninety successfully lesioned rats were equally and randomly divided into three groups. Rats in the bFGF group were intramuscularly injected daily with bFGF （8 ug/kg）. Rats in the saline control group received an equal volume of saline. The rats in the model group did not receive other interventions. Superoxide dismutase activity was measured using the xanthine oxidase method. Malondialdehyde contents were detected using the thiobarbituric acid method. MAIN OUTCOME MEASURES： At 1, 3, and 7 days following intracerebral hemorrhage, superoxide dismutase and malondialdehyde were determined in the brain tissue surrounding the hematoma and in the hippocampus in the affected hemisphere. RESULTS： In brain tissue surrounding the hematoma, superoxide dismutase activity was significantly increased in the bFGF group at 3 and 7 days after intracerebral hemorrhage compared with the saline control group, whereas malondialdehyde content was significantly decreased （P 〈 0.05）. In the hippocampus, superoxide dismutase activity was significantly increased in

关键词： basic fibroblast growth factor intracerebral hemorrhage superoxide dismutase malondialdehyde

Algorithmic approach to discrete fracture network flow modeling in consideration of realistic connections in large-scale fracture networks

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Journal of Rock Mechanics and Geotechnical Engineering 2024年第9期16卷 3798-3811页

作者： Qihua Zhang Shan Dong Yaoqi Liu junjie huang Feng Xiong Badong National Observation and Research Station of Geohazards China University of GeosciencesWuhan430074China SINOPEC Shanghai Engineering Co. Ltd.Shanghai200120China Faculty of Engineering China University of GeosciencesWuhan430074China

Analyzing rock mass seepage using the discrete fracture network(DFN)flow model poses challenges when dealing with complex fracture *** paper presents a novel DFN flow model that incorporates the actual connections of large-scale ***,this model efficiently manages over 20,000 fractures without necessitating adjustments to the DFN *** geometric analyses,such as identifying connected fractures,dividing the two-dimensional domain into closed loops,triangulating arbitrary loops,and refining triangular elements,are fully *** analysis processes are comprehensively introduced,and core algorithms,along with their pseudo-codes,are outlined and explained to assist readers in their programming *** accuracy of geometric analyses is validated through topological graphs representing the connection relationships between *** practical application,the proposed model is employed to assess the water-sealing effectiveness of an underground storage cavern *** analysis results indicate that the existing design scheme can effectively prevent the stored oil from leaking in the presence of both dense and sparse ***,following extensive modification and optimization,the scale and precision of model computation suggest that the proposed model and developed codes can meet the requirements of engineering applications.

关键词： Discrete fracture network(DFN)flow model Geometric algorithm Fracture flow Water-sealing effect

Emerging microfluidic technologies for sperm sorting

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Engineered Regeneration 2023年第2期4卷 161-169页

作者： junjie huang Hanxu Chen Ning Li Yuanjin Zhao Department of Andrology Nanjing Drum Tower HospitalSchool of Biological Science and Medical EngineeringSoutheast UniversityNanjing 210096China

Sorting high-quality sperm with intact DNA,normal morphology,and active motility is crucial for clinically assisted reproductive technology,which influences the success of treatment and the health of ***,microfluidic technology has been developed as a powerful platform for sperm sorting owing to its ability to manipulate fluid at the microscale and handle small ***,microfluidic technology provides the necessary stimuli including fluid stimulus,chemical induction,and shape sift,which supports researchers in developing various sperm-sorting *** to the sorting principle,these devices can be divided into three categories:active sorting devices based on sperm rheological properties,passive sorting devices based on sperm physical properties,and external stimuli-induced sorting ***,we review a broad range of researches about sperm sorting with microfluidics and briefly present the properties of sperm and female reproductive tract to assist the design of microfluidic sperm sorting devices.

关键词： Microfluidics Sperm sorting Fertility Morphology Motility

Safety monitoring method for powerline corridors based on single‐stage detector and visual matching

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High Voltage 2024年第4期9卷 805-815页

作者： Jinheng Li Hanbo Zheng Peng Liu Yanshen Liang Feng Shuang junjie huang Guangxi Key Laboratory of Power System Optimization and Energy Technology Guangxi UniversityNanningChina China Southern Power Grid Guangxi Power Grid Company Ltd. NanningChina State Grid Hubei Electric Power Research Institute WuhanChina

Effective monitoring and early warning of overhead power lines are critical for ensuring power supply stability and personnel ***,existing methods that rely solely on single vision or light detection and ranging(LiDAR)have limitations such as numerous invalid alarms,hardware equipment constraints,and lack of real-time monitoring *** article proposes an intelligent monitoring method for safety distance of the powerline corridor based on heterogeneous sensor ***,an optimised single-stage detector is designed to detect safety hazard *** the detector,the backbone network and the sample matching strategy are improved;in addition,the learning strategy is ***,the pose transformation relationship is obtained through the visual matching of prior LiDAR information and *** back projection transformation of 2D–3D is achieved according to the ***,a monocular camera-based end-to-end distance measurement scheme is proposed by combining 2D object information with coordinate transformation *** scheme is applied to the distance measurements from hazard objects to *** experimental results show that the optimisation method improves the detection accuracy and reduces the computational complexity of the ***,case experiments with continuous frame data verify the effectiveness of the safety distance monitoring scheme.

关键词： visual hardware matching

Polyurethane grouting materials with different compositions for the treatment of mud pumping in ballastless track subgrade beds:properties and application effect

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Railway Engineering Science 2022年第2期30卷 204-220页

作者： Zhichao huang Qian Su junjie huang Minqi Dong Dong Li Ting Liu School of Civil Engineering Southwest Jiaotong UniversityChengdu 610031China Key Laboratory of High-Speed Railway Engineering of Ministry of Education Southwest Jiaotong UniversityChengdu 610031China China Railway Fourth Survey and Design Institute Group Co. Ltd.Wuhan 430000China China Railway Construction Kunlun Investment Group Co. Ltd.Chengdu 610040China

Mud pumping in subgrade beds under ballastless tracks will deteriorate the dynamic performance of infrastructure under railway lines,reduce the smoothness of the railway lines,and seriously affect the comfort and safety of the *** to their good mechanical properties,twocomponent polyurethane materials can be used for grouting to treat the fouling problems caused by ballastless track mud *** develop a polyurethane formula suitable for the treatment of ballastless track mud pumping,we first performed indoor experiments to investigate the mechanical properties and gelation time of polyurethane elastomers synthesized with different raw material composition ratios,to determine an optimal composition ratio of the raw ***,we conducted a dynamic field test to verify the remediation effect of the polyurethane material fabricated according to the design *** results showed that polyurethane grouting material with the selected design ratios improved the contact characteristics between the surface layer of the subgrade bed and the base plate in the area,coordinating the dynamic response between the track structure and the subgrade ***,the obtained polyurethane grouting material could be used to renovate mud pumping areas of ballastless tracks with a good treatment effect.

关键词： Ballastless track Mud pumping Twocomponent polyurethane Proportioning design Field dynamic test