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第41届中国控制会议

作者： Jianhao Li Xiaowei Jiang Hao Chen Shaoying Wang Xianhe Zhang School of Automation China University of Geosciences Hubei Key Laboratory of Advanced Control and Intelligent Automation of Complex Systems Engineering Research Center of Intelligent Technology for Geo-Exploration Ministry of Education Fujian Provincial Key Laboratory of Intelligent Identification and Control of Complex Dynamic System College of Science Binzhou University School of Electrical Engineering and Automation Hubei Normal University

ISBN: (数字)9789887581536

ISBN: (纸本)9781665482561

In this paper,we focus on the tracking performance(TP) limitations of networked control systems(NCS s).The control system considered is a multi-input and multi-output(MIMO) discrete-time network control system with time delay,channel noise,packet dropouts,and logarithmic quantization communication *** modeling the channel,we assumed the channel noise to be additive white Gaussian noise(AWGN) and used a binary random process to model packet dropouts and a logarithmic quantizer to model the quantization *** explicit expression of the TP limitations of NCSs utilizing the two-degree-of-freedom(TDOF) controller is then derived using the frequency-domain approach,coprime decomposition,and Youla parameterization *** results show that the essential characteristics of the plant(locations and directions of nonminimum phase zeros and unstable poles) and network constraints(time delay,packet dropouts,quantization,and noise power spectral density) are closely related to the TP limitations.

关键词： Networked control systems tracking performance limitations packet dropouts logarithmic quantization

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Comparative study of Co_(3)O_(4)-ZSM-5 catalysts synthesized by different hydrothermal methods for the catalytic oxidation of dichloromethane

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Chinese Chemical Letters 2021年第3期32卷 1224-1228页

作者： Xiaoqi Fei Shuang Cao Weilong Ouyang Haiqiang Wang Zhongbiao Wu Key Laboratory of Environment Remediation and Ecological Health Ministry of EducationCollege of Environmental&Resources ScienceZhejiang UniversityHangzhou 310058China Zhejiang Provincial Engineering Research Center of Industrial Boiler&Furnace Flue Gas Pollution Control Hangzhou 310058China Department of Environmental Engineering China Jiliang UniversityHangzhou 310018China

In this work,various Co_(3)O_(4)-ZSM-5 catalysts were prepared by the microwave hydrothermal method(MH-Co_(3)O_(4)@ZSM-5),dynamic hydrothermal method(DH-Co_(3)O_(4)@ZSM-5),and conventio nal hydrothermal method(CH-Co_(3)O_(4)/ZSM-5).Their catalytic oxidation of dichloromethane(DCM)was *** characterizations such as X-ray diffractometer(XRD),scanning microscopy(SEM),X-ray photoelectron spectroscopy(XPS),Brunauer-Emmett-Teller(BET),H2 temperature-programmed reduction(H2-TPR),temperature-programmed desorption of O_(2)(O_(2)-TPD),temperature-programmed desorption of NH_(3)(NH_(3)-TPD),diffuse reflectance infrared Fourier-transform spectra with NH_(3)molecules(NH_(3)-DRIFT),and temperature-programmed surface reaction(TPSR)were *** showed that with the assistance of microwave,MH-Co_(3)O_(4)@ZSM-5 formed a uniform core-shell structure,while the other two samples did ***-Co_(3)O_(4)@ZSM-5 possessed rich surface adsorbed oxygen species,higher ratio of Co^(3+)/Co^(2+),strong acidity,high reducibility,and oxygen mobility among the three Co_(3)O_(4)-ZSM-5 catalysts,which was beneficial for the improvement of DCM *** the oxidation of dichloromethane,MH-Co_(3)O_(4)@ZSM-5 presented the best activity and mineralization,which was consistent with the characterizations ***,according to the TPSR test,HCl or Cl_(2)removal from the catalyst surface was also promoted in MH-Co_(3)O_(4)@ZSM-5 by their abundant Bronsted acid sites and the promotion of Deacon reaction by Co_(3)O_(4)or the synergistic effect of Co_(3)O_(4)and *** to the results of in situ DRIFT studies,a possible reaction pathway of DCM oxidation was proposed over the MH-Co_(3)O_(4)@ZSM-5 catalysts.

关键词： Dichloromethane Catalytic oxidation Co_(3)O_(4) ZSM-5 Core-shell structure Microwave hydrothermal method

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VO2-based thermochromic films with passive radiative properties for spacecraft thermal control

VO2-based thermochromic films with passive radiative propert...

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2021 International Conference on Laser, Optics and Optoelectronic Technology, LOPET 2021

作者： Wu, Xueyu Weng, Xiaolong Yuan, Le Qi, Lun Wei, Biao Zhang, Jianguo National Engineering Research Center of Electromagnetic Radiation Control Materials School of Electronic Science and Engineering University of Electronic Science and Technology of China Chengdu610054 China Key Laboratory of Fluid and Power Machinery of Ministry of Education School of Materials Science and Engineering Xihua University Chengdu610039 China

ISBN: (纸本)9781510646162

VO2 film is expected to be used in smart radiation devices (SRD) due to changes in infrared reflection caused by semiconductor-to-metal transition (SMT). In this work, a tunable thermal emitter which consisted of Al layer, CaF2 layer and VO2 layer was designed to achieve variable emittance with temperature. The variation of dielectric parameters of VO2 shell caused by temperature change was used to regulate the absorption characteristics of the structure, to realize the positive emittance-switching performance of the thermal emitter device. It was found that the total emittance of the device could reversibly change from 0.03 at 30℃ to 0.72 at 90℃ with an emittance variability of 0.69 in 4-14 μm. In addition, the influence of the thickness of CaF2, VO2 layers and the intermediate layer material on the emittance variation of the device was studied. These results shown that the device has the best VO2 and CaF2 layer thicknesses of 20nm and 1000nm, respectively. Particularly, too high refractive index of the intermediate layer material will cause the device to produce multiple resonance peaks at high temperature, which will reduce the average emissivity of the entire band, resulting in a smaller change in the emissivity of the thermal emitter. © 2021 SPIE.

关键词： Vanadium dioxide

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Disconnected stationary solutions for 2D Kolmogorov flow problem in periodic domain 9

Disconnected stationary solutions for 2D Kolmogorov flow pro...

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9th International Conference on Mathematical Modeling in Physical sciences, IC-MSQUARE 2020

作者： Evstigneev, Nikolay M. Federal Research Center "computer Science and Control Institute for System Analysis Russian Academy of Science pr. 60-letiya Oktyabrya 9 Moscow117312 Russia

The classical A.N. Kolmogorov's flow problem for the stationary 2D Navier-Stokes equations on a stretched torus for velocity vector function is considered. The problem is analysed by the construction of the solution curves in the parameter-phase space and analysis of disconnected solutions is performed. Disconnected solutions from the main solution branch are found. © Published under licence by IOP Publishing Ltd.

关键词： Navier Stokes equations

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Observation and analysis of atmospheric volatile organic compounds in a typical petrochemical area in Yangtze River Delta, China

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Journal of Environmental sciences 2018年第9期30卷 233-248页

作者： Yunchen Zhang Rui Li Hongbo Fu Dong Zhou Jianmin Chen Shanghai Key Laboratory of Atmospheric Particle Pollution and Prevention Department of Environmental Science & Engineering Fudan University Shanghai 200433 China Shanghai Institute of Pollution Control and Ecological Security Shanghai 200092 China Collaborative Innovation Center of Atmospheric Environment and Equipment Technology (CICAEET) Nanjing University of Information Science and Technology Nanjing 210044 China

Volatile organic compounds （VOCs） are a kind of important precursors for ozone photochemical formation. In this study, VOCs were measured from November 5th, 2013 to January 6th, 2014 at the Second Jinshan Industrial Area, Shanghai, China. The results showed that the measured VOCs were dominated by alkanes （41.8%）, followed by aromatics （20.1%）, alkenes （17.9%）, and halo-hydrocarbons （12.5%）. The daily trend of the VOC concentration showed a bimodal feature due to the rush-hour traffic in the morning and at nightfall. Based on the VOC concentration, a receptor model of Positive Matrix Factorization （PMF） coupled with the information related to VOC sources was applied to identify the major VOC emissions. The result showed five major VOC sources： solvent use and industrial processes were responsible for about 30% of the ambient VOCs, followed by rubber chemical industrial emissions （23%）, refinery and petrochemical industrial emissions （21%）, fuel evaporations （13%） and vehicular emissions （13%）. The contribution of generalized industrial emissions was about 74% and significantly higher than that made by vehicle exhaust. Using a propylene-equivalent method, alkenes displayed the highest concentra-tion, followed by aromatics and alkanes. Based on a maximum incremental reactivity （MIR） method, the average hourly ozone formation potential （OFP） of VOCs is 220.49 ppbv. The most significant source for ozone chemical formation was identified to be rubber chemical industrial emissions, following one by vehicular emission. The data shown herein may provide useful information to develop effective VOC pollution control strategies in industrialized area.

关键词： VOCs PMF Emission sources Photochemical reactivity MIR OFP

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Composite indicators detector for measuring harmful substances in milk

Composite indicators detector for measuring harmful substanc...

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2010 International Conference on Computer, Mechatronics, control and Electronic engineering, CMCE 2010

作者： Yuan, Wenju Wang, Xin Jia, Anping Zhao, Kongxin Zhang, Zhiyi College of Computer Science and Engineering Changchun University of Technology Changchun 130012 China Changchun Center for Disease Control and Prevention Changchun 130118 China

ISBN: (纸本)9781424479566

An electronic analytical detector was designed in this paper, which can measure composite indicators of harmful substances contained in fresh milk. The basic principle of the instrument measuring composite indicators was given firstly. Secondly the instrument structure and circuit design methods with parallel processing by a variety of sensors and processors were explained. On this basis, the mathematics model of fresh milk quality was given based on artificial neural network, which consists of a hidden layer structure, improved BP network. Finally the test data were presented, which shows the accuracy and reliability of the designed detector. © 2010 IEEE.

关键词： Neural networks

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Identification of Shell Color-Associated Genes Using Mantle Branch-Specific RNA Sequencing of Yellow-Colored Line of Pearl Oyster Pinctada fucata martensii

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Journal of Ocean University of China 2024年第4期23卷 1076-1086页

作者： PENG Haiming LIAO Yongshan YANG Chuangye MKUYE Robert DENG Yuewen YUE Chenyang Fisheries College Guangdong Ocean UniversityZhanjiang 524088China Pearl Research Institute Guangdong Ocean UniversityZhanjiang 524088China Guangdong Science and Innovation Center for Pearl Culture Zhanjiang 524088China Pearl Breeding and Processing Engineering Technology Research Center of Guangdong Province Zhanjiang 524088China Guangdong Provincial Key Laboratory of Aquatic Animal Disease Control and Healthy Culture Zhanjiang 524088China

The yellow-colored line of pearl oyster Pinctada fucata martensii displays a yellow prismatic layer and a white nacreous layer that can be used as an ideal model for research on shell color ***-Raman spectroscopy and transcriptome analyses were performed to explore the potential molecular mechanism underlying the phenotype *** micro-Raman spectroscopy results indicate that the prismatic layer exhibits distinct characteristic peaks of carotenoids,while these peaks are not prominent in the nacreous *** the transcriptome comparison of the central zone of mantle and mantle edge tissue,which function in nacreous and prismatic layer formation,respectively,935 significantly differentially expressed genes(DEGs)were identified,with 385 genes upregulated and 227 genes downregulated(|log_(2)(Fold change)|>1 and false discovery rate<0.05)in the mantle edge *** these genes,some were associated with melanoma/melanogenesis,such as tyrosinase,zinc metalloprotease,glutathione S-transferase,and ATP-binding cassette sub-family;some were associated with the carotenoid-related pathway,including scavenger receptors,cytochrome P450 and lipoprotein *** associated with porphyrin metabolism,including porphobilinogen deaminase,and copper/zinc superoxide dismutase,and genes associated with shell matrix protein,including amorphous calcium carbonate binding protein,shematrin,PIF,and collagen,also exhibited significantly different *** is speculated that the different colours between prismatic layer and nacreous layer in the yellow-colored line of *** might be resulted from melanin,carotenoids and porphyrin metabolism,while genes related to shell structure and biomineralization might also affect *** results provide new insights to understand the mechanism of shell color formation in mollusca.

关键词： Pinctada fucata martensii shell coloration transcriptome

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The Study of Nickel Impurity Segregation on LSNT Perovskite Open Surfaces by Ab Initio Molecular Dynamics

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Russian Microelectronics 2022年第8期51卷 654-658页

作者： Chistyakova, A.A. Bazhanov, D.I. Faculty of Physics Moscow State University Moscow119991 Russia Federal Research Center "Computer Science and Control " Russian Academy of Sciences Moscow119333 Russia Moscow Aviation Institute Moscow125993 Russia

Abstract: In this paper, the segregation of an Ni impurity on open surfaces of doped strontium titanate perovskite is investigated by the ab initio molecular dynamics method based on the density functional theory and applied to a model periodic cell with stoichiometry (Formula presented.). The studies are based on recent experimental observations on the segregation of Ni impurity atoms and their tendency to form clusters at the boundaries of (Formula presented.) (LSNT) perovskite structure defects. The results of the first-principles calculations of segregation energy showed that Ni actively segregates toward the open surfaces. It is found that during segregation, nickel atoms leave the crystal volume toward the perovskite surface and rise above its upper layer. Thus, the obtained results confirm the experimental data on the segregation and formation of nickel clusters on open LSNT surfaces. © 2022, Pleiades Publishing, Ltd.

关键词： Perovskite

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Spacecraft attitude stabilization using optimal sliding mode control

Spacecraft attitude stabilization using optimal sliding mode...

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3rd International Symposium on Systems and control in Aeronautics and Astronautics, ISSCAA2010

作者： Li, Chuanjiang Wang, Yibo Xu, Liang Zhang, Zhongzhao Control Science and Engineering Department Harbin Institute of Technology Harbin 150001 China Center on Communications Harbin Institute of Technology Harbin 150001 China

ISBN: (纸本)9781424460441

The attitude stabilization problem for a spacecraft is addressed through the combination of optimal control and sliding mode variable structure control method. We first determine an optimal sliding manifold for the kinematical subsystem of the spacecraft. Then a variable structure controller, which is based on equivalent control and the optimal sliding surface, is designed for the whole dynamical and kinematical system. An important feature of the methodology is that when the sliding manifold is reached, the attitude variables will be stabilized to the origin in the sense of optimality with respect to a quadratic cost functional. The proposed controller is also robust to external disturbances. Simulations are performed to demonstrate the effectiveness of the proposed optimal sliding mode controller. ©2010 IEEE.

关键词： controllers

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A novel electro-Fenton hybrid system for enhancing the interception of volatile organic compounds in membrane distillation desalination

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Journal of Environmental sciences 2024年第4期138卷 189-199页

作者： Hongxin Liu Kuiling Li Kunpeng Wang Zhiyong Wang Zimou Liu Sichao Zhu Dan Qu Yu Zhang Jun Wang State Key Laboratory of Environmental Aquatic Chemistry Research Center for Eco-Environmental SciencesChinese Academy of SciencesBeijing 100085China University of Chinese Academy of Sciences Beijing 100049China State Key Laboratory of Environment Simulation and Pollution Control School of Environment Tsinghua UniversityBeijing 100084China School of Chemical and Environmental Engineering Beijing CampusChina University of Mining and TechnologyBeijing 100083China Beijing Key Lab for Source Control Technology of Water Pollution College of Environmental Science and EngineeringBeijing Forestry UniversityBeijing 100083China

Membrane distillation(MD)is a promising alternative desalination technology,but the hydrophobic membrane cannot intercept volatile organic compounds(VOCs),resulting in aggravation in the quality of *** term of this,electro-Fenton(EF)was coupled with sweeping gas membrane distillation(SGMD)in a more efficient way to construct an advanced oxidation barrier at the gas-liquid interface,so that the VOCs could be trapped in this layer to guarantee the water quality of the *** the so-called EF-MD process,an interfacial interception barrier containing hydroxyl radical formed on the hydrophobic membrane *** contributed to the high phenol rejection of 90.2% with the permeate phenol concentration lower than 1.50 mg/*** interceptions can be achieved in a wide temperature range,even though the permeate flux of phenol was also *** EF-MD system was robust to high salinity and could electrochemically regenerate ferrous ions,which endowed the long-term stability of the *** novel EF-MD configuration proposed a valuable strategy to intercept VOCs in MD and will broaden the application of MD in hypersaline wastewater treatment.

关键词： Membrane distillation VOC interception Interfacial oxidation Electro-Fenton Hypersaline wastewater

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