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Time-delay Compensation Method for Networked Control System Based on Time-delay Prediction and Implicit PIGPC

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International Journal of Automation and computing 2015年第6期12卷 648-656页

作者： Zhong-da Tian Xian-Wen gao bi-Lian Gong Tong Shi School of Information Science and Engineering Shenyang University of Technology School of Information Science and Engineering Northeastern University Department of Humanities Liaoning Forestry Vocation-Technical College

A network time-delay compensation method based on time-delay prediction and implicit proportional-integral-based generalized predictive controller(PIGPC) is proposed. The least squares support vector machine(LSSVM) is used to predict the current time-delay, the parameters of the least squares support vector machine are optimized by particle swarm optimization(PSO) algorithm,and the predicted time-delay is used instead of the actual time-delay as the parameters of the network time-delay compensation controller. In order to improve the compensation effect of implicit generalized predictive controller(GPC), this paper puts forward an implicit generalized predictive control algorithm with proportional-integral-based(PI) structure and designs the controller based on implicit PIGPC. Through the simulation results, the effectiveness of this design in the paper is verified.

关键词： Networked control system time-delay compensation p

Visual attention based model for target detection in large-field images

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Journal of Systems Engineering and Electronics 2011年第1期22卷 150-156页

作者： Lining gao Fukun bi Jian Yang Department of Electronic Engineering Tsinghua University Beijing 100084 P. R. China School of Information and Electronics Beijing Institute of Technology Beijing 100081 E R. China

It is of great significance to rapidly detect targets in large-field remote sensing images,with limited computation *** relative achievements of visual attention in perception psychology,this paper proposes a hierarchical attention based model for target ***,at the preattention stage,before getting salient regions,a fast computational approach is applied to build a saliency *** that,the focus of attention（FOA） can be quickly obtained to indicate the salient ***,at the attention stage,under the FOA guidance,the high-level visual features of the region of interest are extracted in ***,at the post-attention stage,by integrating these parallel and independent visual attributes,a decision-template based classifier fusion strategy is proposed to discriminate the task-related targets from the other extracted salient *** comparison,experiments on ship detection are done for validating the effectiveness and feasibility of the proposed model.

关键词： target detection visual attention salient region classifier fusion.

A novel strong tracking cubature Kalman filter and its application in maneuvering target tracking

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Chinese Journal of Aeronautics 2019年第11期32卷 2489-2502页

作者： An ZHANG Shuida BAO Fei gao Wenhao bi School of Aeronautics Northwestern Poly technical UniversityXi’an 710072China School of Electronics and Information Northwestern Poly technical UniversityXi’an 710129China

The fading factor exerts a significant role in the strong tracking idea. However, traditional fading factor introduction method hinders the accuracy and robustness advantages of current strong-tracking-based nonlinear filtering algorithms such as Cubature Kalman Filter(CKF) since traditional fading factor introduction method only considers the first-order Taylor expansion. To this end, a new fading factor idea is suggested and introduced into the strong tracking CKF *** new fading factor introduction method expanded the number of fading factors from one to two with reselected introduction positions. The relationship between the two fading factors as well as the general calculation method can be derived based on Taylor expansion. Obvious superiority of the newly suggested fading factor introduction method is demonstrated according to different nonlinearity of the measurement function. Equivalent calculation method can also be established while applied to CKF. Theoretical analysis shows that the strong tracking CKF can extract the thirdorder term information from the residual and thus realize second-order accuracy. After optimizing the strong tracking algorithm process, a Fast Strong Tracking CKF(FSTCKF) is finally established. Two simulation examples show that the novel FSTCKF improves the robustness of traditional CKF while minimizing the algorithm time complexity under various conditions.

关键词： Algorithm time complexity Cubature Kalman filter Nonlinear filtering Robustness Strong tracking filter

Systemic acquired resistance, NPR1, and pathogenesis-related genes in wheat and barley

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Journal of Integrative Agriculture 2018年第11期17卷 2468-2477页

作者： WANG Xiao-dong bi Wei-shuai gao Jing YU Xiu-mei WANG Hai-yan LIU da-qun College of Plant Protection/biological Control Center for Plant Diseases and Plant Pests of Hebei Hebei Agricultural University Baoding 071000 P.R.China College of Life Sciences Hebei Agricultural University Baoding 071000 P.R.China Graduate School of Chinese Academy of Agricultural Sciences Beijing 100081 P.R.China

In Arabidopsis, systemic acquired resistance （SAR） is established beyond the initial infection by a pathogen or is directly induced by treatment with salicylic acid （SA） or its functional analogs, 2,6-dichloroisonicotinic acid （INA） and benzothiadiazole （BTH）. NPR1 protein is considered the master regulator of SAR in both SA signal sensing and transduction. In wheat （Triticum aesfivum） and barley （Hordeum vulgare）, both pathogen infection and BTH treatment can induce broad-spectrum resistance to various diseases, including powdery mildew, leaf rust, Fusarium head blight, etc. However, three different types of SAR-like responses including acquired resistance （AR）, systemic immunity （SI）, and BTH-induced resistance （biR） seem to be achieved by activating different gene pathways. Recent research on wheat and barley NPR1 homologs in AR and SI has provided the initial clue for understanding the mechanism of SAR in these two plant species. In this review, the specific features ofAR, Si, and biR in wheat and barley were summarized and compared with that of SAR in model plants of Arabidopsis and rice. Research updates on downstream genes of SAR, including pathogenesis-related （PR） and BTH-induced genes, were highlighted.

关键词： systemic acquired resistance NPR1 pathogenesis-related genes wheat barley

Combination of Organic and Inorganic Electrolytes for Composite Membranes Toward Applicable Solid Lithium Batteries

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Chemical Research in Chinese Universities 2021年第2期37卷 246-253页

作者： MU Shuang bi Zhijie gao Shenghan GUO Xiangxins College of Physics Qingdao UniversityQingdao266071P.R.China

To meet the demand for long-range electric vehicles with high-energy-density batteries,the solid-state batteries(SSBs)have attracted ever-increasing attention due to their enormous potential in affording the energy density greater than 400 W·h/*** the key materials,the solid electrolytes can be classified as inorganic electrolyte and organic *** former usually has high ionic conductivity,good stability and mechanical properties,whereas being heavy and *** latter is usually flexible,light and easy to mass produce,nevertheless has poor ionic conductivity and ***,the combination of the organic and the inorganic electrolytes for the composite membranes has become the inevitable trend to achieve the high energy density and safety of lithium *** the perspective of practical application,this paper discusses how to construct the ideal organic-inorganic composite solid electrolyte with low areal specific resistance,thin texture,wide electrochemical window and high safety for applicable ***,the critical challenges and future development directions are prospected for the composite solid electrolytes.

关键词： Composite electrolyte Solid-state lithium battery Energy density Security

Design and fabrication of NiFe_(2)O_(4)/few-layers WS_(2) composite for supercapacitor electrode material

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Frontiers of Materials Science 2023年第3期17卷 83-94页

作者： Xicheng gao Jianqiang bi Lulin Xie Chen Liu Key Laboratory for Liquid-Solid Structural Evolution and Processing of Materials(Ministry of Education) School of Materials Science and EngineeringShandong UniversityJinan 250061China

Few-layers WS_(2) was obtained through unique chemical liquid exfoliation of commercial WS_(2).Results showed that after the exfoliation process,the thickness of WS_(2) reduced ***,the NiFe_(2)O_(4) nanosheets/WS_(2) composite was successfully synthesized through a facile hydrothermal method at 180°C,and then proven by the analyses of field emission scanning electron microscopy,X-ray diffraction,and X-ray photoelectron *** composite showed a high specific surface area of 86.89 m^(2)·g^(−1) with an average pore size of 3.13 ***,in the threeelectrode electrochemical test,this composite exhibited a high specific capacitance of 878.04 F·g^(−1) at a current density of 1 A·g^(−1),while in the two-electrode system,the energy density of the composite could reach 25.47 Wh·kg^(−1) at the power density of 70 W·kg^(−1) and maintained 13.42 Wh·kg^(−1) at the higher power density of 7000 W·kg^(−1).All the excellent electrochemical performances demonstrate that the NiFe_(2)O_(4) nanosheets/WS_(2) composite is an excellent candidate for supercapacitor applications.

关键词： WS_(2) chemical liquid exfoliation NiFe_(2)O_(4) composite supercapacitor

Activated carbon induced oxygen vacancies-engineered nickel ferrite with enhanced conductivity for supercapacitor application

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Frontiers of Chemical Science and Engineering 2023年第12期17卷 2088-2100页

作者： Xicheng gao Jianqiang bi Linjie Meng Lulin Xie Chen Liu Key Laboratory for Liquid-Solid Structural Evolution and Processing of Materials(Ministry of Education) School of Materials Science and EngineeringShandong UniversityJinan 250061China

NiFe_(2)O_(4) is a kind of bimetallic oxide possessing excellent theoretical capacity and application prospect in the field of ***,due to the inherent poor conductivity of metal oxides,the performance of NiFe_(2)O_(4) is not ideal in *** vacancies can not only enhance the conductivities of NiFe_(2)O_(4) but also provide better adsorption of OH,which is beneficial to the electrochemical ***,oxygen vacancies engineered NiFe_(2)O_(4)(NiFe_(2)O_(4)‒δ)is obtained through a two-step method,including a hydrothermal reaction and a further heat treatment in activated carbon *** of electron paramagnetic resonance spectra indicate that more oxygen vacancies exist in the treated NiFe_(2)O_(4)‒δthan the original ***-Vis diffuse reflectance spectra prove that the treated NiFe_(2)O_(4)‒δowns better conductivity than the original NiFe_(2)O_(4).As for the electrochemical performances,the treated NiFe_(2)O_(4)‒δperforms a high specific capacitance of 808.02 F∙g^(‒1) at 1 A∙g^(‒1).Moreover,the asymmetric supercapacitor of NiFe_(2)O_(4)‒δ//active carbon displays a high energy density of 17.7 Wh∙kg^(‒1) at the power density of 375 W∙kg^(‒1).This work gives an effective way to improve the conductivity of metal oxides,which is beneficial to the application of metal oxides in supercapacitors.

关键词： nickel ferrite oxygen vacancy high conductivity supercapacitor

Investigation the improvement of high voltage spinel LiNi_(0.5)Mn_(1.5)O_(4) cathode material by anneal process for lithium ion batteries

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Green Energy & Environment 2021年第1期6卷 114-123页

作者： Chao gao Haiping Liu Sifu bi Huilin Li Chengshuai Ma School of Marine Science and Technology Harbin Institute of TechnologyWeihai264209China School of Materials Science and Engineering Harbin Institute of TechnologyWeihai264209China

The spinel LiNi_(0.5)Mn_(1.5)O_(4)(LNMO)has been attracted great attention as lithium ion cathode material due to its high voltage and large energy ***,the practical application of LNMO is still limited by poor cycling ***,to improve the cycling stability of spinel LNMO,it was treated with anneal process at 900℃for 2 h after prepared by traditional solid-state method(LNMO-A).LNMO-A sample presented better electrochemical property especially under high rate,with capacity of 91.2 mAhg^(-1) after 1000 cycles under 10 *** superior electrochemical property was ascribed to the anneal process,resulting a stable crystal structure,indicated by XRD and Raman results of electrodes after 1000 cycles under 10 C and the longer solid-solution reaction,revealed by in-situ *** addition,the optimized particle size,micro morphology and the larger BET area surface induced by the recrystallization in anneal process also contributes to its superior electrochemical ***'s more,the thin layer,which interacted LNMO-A particles with each other,induced by particles remelting in anneal process is also beneficial for its excellent electrochemical *** study not only improved the electrochemical properties by anneal process,but also revealed the origins and mechanisms for its improvement.

关键词： High voltage LiNi_(0.5)Mn_(1.5)O_(4) Anneal process Crystal structure stability Cycling stability In-situ XRD

Numerical Investigations on Harbor Oscillations Induced by Falling Objects

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China Ocean Engineering 2023年第3期37卷 458-470页

作者： gao Jun-liang bi Wen-jing ZHANG Jian ZANG Jun School of Naval Architecture and Ocean Engineering Jiangsu University of Science and TechnologyZhenjiang 212100China Key Laboratory of Port Waterway and Sedimentation Engineering of MOTNanjing Hydraulic Research InstituteNanjing 210029China Key Laboratory of Water Security Guarantee in Guangdong-Hong Kong-Marco Greater Bay Area of Ministry of Water Resources Guangzhou 510611China Centre for Infrastructure Geotechnical and Water Engineering(IGWE)Department of Architecture and Civil EngineeringUniversity of BathBA27AYUK

In this paper,the open-sourced computational fluid dynamics software,OpenFOAM~?,is used to study the fluctuation phenomenon of the water body inside a horizontally one-dimensional enclosed harbor basin with constant water depth triggered by falling wedges with various horizontal falling positions,initial falling velocities and *** on both Fourier transfo rm analysis and wavelet spectrum analysis for the time series of the free surface elevations inside the harbor basin,it is found for the first time that the wedge falling inside the harbor can directly trigger harbor *** influences of the three factors(including the horizontal falling position,the initial falling velocity,and the mass)on the response amplitudes of the lowest three resonant modes are also *** results show that when the wedge falls on one of the nodal points of a resonant mode,the mode would be remarkably ***,when the wedge falls on one of the anti-nodal points of a resonant mode,the mode would be evidently *** initial falling velocity of the wedge mainly has a remarkable effect on the response amplitude of the most significant mode,and the latter shows a gradual increase trend with the increase of the *** for the other two less significant modes,their response amplitudes fluctuate around certain constant values as the initial falling velocity *** general,the response amplitudes of all the lowest three modes are shown to gradually increase with the mass of the wedge.

关键词： harbor oscillations seiches falling objects resonant mode response amplitude