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A compensation method for the packet loss deviation in system identification with event-triggered binary-valued observations

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Science China(Information Sciences) 2020年第12期63卷 266-268页

作者： jing-dong DIAo jin GUo Changyin SUN School of Automation and Electrical Engineering University of Science and Technology Beijing Key Laboratory.of Knowledge Automation for Industrial Processes Ministry of Education School of Automation Southeast University Key Laboratory.of Measurement and Control of Complex System of Engineering Ministry of Education

Dear editor,With the rapid development of network and communication technology, group systems interrelated in terms of both time and space are commonly encountered, such as sensor networks, multi-agent systems, and sm... 详细信息

关键词： system identification event-triggered binary-valued observations packet loss convergence

Microbial degradation of various types of dissolved organic matter in aquatic ecosystems and its influencing factors

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Science China Earth Sciences 2023年第2期66卷 169-189页

作者： Meilian CHEN jin HUR Ji-dong GU youhei yAMASHITA Environmental Science and Engineering Research Group Guangdong Technion-Israel Institute of TechnologyShantou515063China Department of Environment&Energy Sejong UniversitySeoul05006Korea Faculty.of Environmental Earth Science Hokkaido UniversitySapporoHokkaido060-0810Japan

Interactions between chemodiverse dissolved organic matter(DoM)and biodiverse microbes are governed by a myriad of intrinsic and extrinsic factors which are not well ***,we update and bridge the gap of this interdisciplinary theme *** an ecosystem level,aquatic ecosystems dominated by algae-sourced DoM(e.g.,eutrophic lake or coastal upwelling areas)harbor more biolabile DoM,such as directly assimilable monomers and readily hydrolysable ***,other ecosystems prevailed by DoM supply from soil and vascular plants(e.g.,river or wetland)have more biorefractory DoM,such as low molecular weight(LMW)residue of aliphatic C skeletons and geopolymers.A variety.of heterotrophic bacteria,archaea,fungi,phagotrophic protists,and even photoautotrophic phy.oplankton shows genomic and/or culturing experimental evidence of being able to process a diverse type of *** various biodegradable organics have different chemical structures and chemical bonds such as carbohydrates,amino acids,proteins,lignins,lipids,carboxylic acids,humic acids,hydrocarbons,and ***,bio-production of metabolism intermediates and/or biorefractory.organics(e.g.,carboxyl-rich alicyclic molecules,CRAM)is observed despite general decay.of bulk dissolved organic carbon(DoC)during bioassay *** particular,emerging evidence shows that archaea contribute significantly to biomass in the marine mesopelagic zone and subsurface environments and their abundance often increases with depth in ***,not only intrinsic factors(e.g.,DoM composition and structure),but also extrinsic ones(e.g.,sunlight and dissolved oxygen)play important roles in interplays between DoM and microbes.

关键词： Dissolved organic matter(DoM) Microbes Bioavailability Bioreactivity Intrinsic factors Environmental factors Nanoplastics

RF design optimization for the SHINE 3.9 GHz cavity

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Nuclear Science and Techniques 2020年第7期31卷 97-105页

作者： yu-Xin Zhang jin-Fang Chen dong Wang Shanghai Institute of Applied Physics Chinese Academy of SciencesShanghai 201204China ShanghaiTech University Shanghai 201210China Shanghai Advanced Research Institute Chinese Academy of SciencesShanghai 201204China

The Shanghai high-repetition-rate XFEL and extreme light facility(SHINE)under construction is designed to be one of the most advanced free electron laser(FEL)facilities in the *** main part of the SHINE facility is an 8 GeV superconducting Linac operating in continuous wave(CW)*** Linac consists of seventy-five 1.3 GHz and two 3.9 GHz *** on the design and experience of 3.9 GHz cavities in the European X-ray free electron laser(E-XFEL)and the Linac coherent light source-II(LCLS-II)projects,we optimize the SHINE 3.9 GHz cavity design to adapt it for CW mode *** this paper,we present a particular redesign of the end group for the SHINE 3.9 GHz superconducting cavity that includes a redesign of the end cell and beam pipe to shift away the potentially troublesome lowest highorder modes(HoMs),a modification of the main coupler antenna,and a tuning of the HoM notch filter to meet the cavity *** losses calculations on the HoM coupler antennas show that the overheating on the inner conductor at the operating mode is diminished ***,we have also studied the HoMs to ensure there are no dangerously trapped modes in the optimized cavity design.

关键词： cavity antenna tuning

The effect of single-horn glaze ice on the vortex structures in the wake of a horizontal axis wind turbine

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Acta Mechanica Sinica 2015年第1期31卷 62-72页

作者： Zhe-yan jin Qiao-Tian dong Zhi-Gang yang School of Aerospace Engineering and Applied Mechanics Tongji University School of Automotive Studies Tongji University Shanghai Automotive Wind Tunnel Center

The present study experimentally investigated the effect of a simulated single-horn glaze ice accreted on ro- tor blades on the vortex structures in the wake of a hori- zontal axis wind turbine by using the stereoscopic particle image velocimetry （Stereo-PIV） technique. During the ex- periments, four horizontal axis wind turbine models were tested, and both ＂free-run＂ and ＂phase-locked＂ Stereo-PIV measurements were carried out. Based on the ＂free-run＂ measurements, it was found that because of the simulated single-horn glaze ice, the shape, vorticity, and trajectory.of tip vortices were changed significantly, and less kinetic en- ergy.of the airflow could be harvested by the wind turbine. In addition, the ＂phase-locked＂ results indicated that the pres- ence of simulated single-horn glaze ice resulted in a dramatic reduction of the vorticity peak of the tip vortices. Moreover, as the length of the glaze ice increased, both root and tip vortex gaps were found to increase accordingly.

关键词： Stereo-PIV Single-horn glaze ice. Tip vorticesRoot vortices Wind turbine icing

Numerical Analysis of Chevron Nozzle Effects on Performance of the Supersonic Ejector-Diffuser System

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Journal of Thermal Science 2013年第5期22卷 459-466页

作者： Fanshi Kong yingzi jin Toshiaki Setoguchi Heuy dong Kim College of Mechanical Engineering & Automation Zhejiang Sci-Tech University School of Mechanical Engineering Andong National University Department of Mechanical Engineering Saga University

The supersonic nozzle is the most important device of an ejector-diffuser *** best operation condition and optimal structure of supersonic nozzle are hardly known due to the complicated turbulent mixing,compressibility effects and even flow unsteadiness which are generated around the nozzle *** the present study,the primary stream nozzle was redesigned using convergent nozzle to activate the shear actions between the primary and secondary streams,by means of longitudinal vortices generated between the Chevron *** same geometrical model of ejector-diffuser system was created to validate the results of experimental *** operation characteristics of the ejector system were compared between Chevron nozzle and conventional convergent nozzle for the primary stream.A CFD method has been applied to simulate the supersonic flows and shock waves inside the *** is observed that the flow structure and shock system were changed and primary numerical analysis results show that the Chevron nozzle achieve a positive effect on the supersonic ejector-diffuser system *** ejector with Chevron nozzle can entrain more secondary stream with less primary stream mass flow rate.

关键词： Ejector-Diffuser System Chevron Nozzle Shock Wave Compressible Flow Supersonic Flow

Numerical simulations of the process of multiple shock–flame interactions

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Acta Mechanica Sinica 2016年第4期32卷 659-669页

作者： Hua Jiang Gang dong Xiao chen jin-Tao Wu Key Laboratory.of Transient Physics Nanjing University of Science and Technology

Based on a weighted essentially nonoscillatory scheme, the multiple interactions of a flame interface with an incident shock wave and its reshock waves are numerically simulated by solving the compressible reactive Navier–Stokes equations with a single-step Arrhenius chemical reaction. The two-dimensional sinusoidally perturbed premixed flames with different initial perturbed amplitudes are used to investigate the effect of the initial perturbation on the flame evolutions. The results show that the development of the flame interface is directly affected by the initial perturbed amplitudes before the passages of reshock waves, and the perturbation development is mainly controlled by the Richtmyer–Meshkov instability（RMI）. After the successive impacts of multiple reshock waves, the chemical reaction accelerates the consumption of reactants and leads to a gradual disappearance of the initial perturbed information. The perturbation developments in frozen flows with the same initial interface as those in reactive flows are also *** of results between the reactive and frozen flows show that a chemical reaction changes the perturbation pattern of the flame interface by decreasing the density gradient,thereby weakening the baroclinic torque in the flame mixing region, and therefore plays a dominant role after the passage of reshock waves.

关键词： flame perturbation perturbed compressible frozen vorticity symmetry weakening successive passage

Rail Detection Based on LSD and the Least Square Curve Fitting

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International Journal of Automation and computing 2021年第1期18卷 85-95页

作者： yun-Shui Zheng yan-Wei jin yu dong College of Automation and Electrical Engineering Lanzhou Jiaotong UniversityLanzhou 730070China Automation Research Institute Lanzhou Jiaotong UniversityLanzhou 730070China

It is necessary to rely.on the rail gauge to determine whether the object beside the track will affect train operation safety.or not.A convenient and fast method based on line segment detector(LSD)and the least square curve fitting to identify the rail in the image is proposed in this *** image in front of the train can be obtained through the camera *** preprocessing,it will be divided equally along the longitudinal *** the characteristics of the LSD algorithm,the edges are approximated into multiple line *** screening the terminals of the line segments,it can generate the mathematical model of the rail in the image based on the least *** show that the algorithm in this paper can fit the rail curve accurately and has good applicability and robustness.

关键词： Rail inspection line segment detector(LSD)algorithm the least square curve fitting foreign object detection

New mechanism to promote long-term T-cell immunity by telomere transfer from antigen-presenting cells

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Cellular & Molecular Immunology 2023年第2期20卷 117-118页

作者： Meiling jin Jian-dong Huang Chinese Academy.of Sciences(CAS)Key Laboratory.of Quantitative Engineering Biology Shenzhen Institute of Synthetic BiologyShenzhen Institutes of Advanced TechnologyChinese Academy of SciencesShenzhenChina School of Biomedical Sciences Li Ka Shing Faculty of MedicineThe University of Hong KongPokfulamHong Kong SARChina Department of Clinical oncology Shenzhen Key Laboratory for Cancer Metastasis and Personalized TherapyThe University of Hong Kong-Shenzhen HospitalShenzhenChina Guangdong-Hong Kong Joint Laboratory for RNA Medicine Sun Yat-Sen University510120GuangzhouChina

Telomeres protect the ends of chromosomes and are important biomarkers of cellular *** mechanism of telomere elongation in T cells is not clear.A recent study revealed that memory CD4+T cells can acquire telomeric DNA transferred via vesicles from antigen-presenting cells,which inhibits T-cell senescence and promotes T-cell expansion and long-lived immunity.

关键词： immunity mechanism transferred

Time-domain dynamic constitutive model suitable for mucky soil site seismic response

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Earthquake Engineering and Engineering Vibration 2024年第1期23卷 1-13页

作者： dong Qing Chen Su jin Liguo Zhou Zhenghua Li Xiaojun Architectural Engineering Institute Huaiyin Institute of TechnologyHuai’an 223600China Key Laboratory.of Urban Security and Disaster Engineering of Ministry.of Education Beijing University of TechnologyBeijing 100020China Institute of Geophysics China Earthquake AdministrationBeijing 100089China College of Transportation Science and Engineering Nanjing Tech UniversityNanjing 211816China

Soil nonlinear behavior displays noticeable effects on the site seismic *** study proposes a new functional expression of the skeleton curve to replace the hyperbolic skeleton *** integrating shear modulus and combining the dynamic skeleton curve and the damping degradation coefficient,the constitutive equation of the logarithmic dynamic skeleton can be obtained,which considers the damping effect in a soil dynamics *** on the finite difference method and the multi-transmitting boundary condition,a 1D site seismic response analysis program called Soilresp1D has been developed herein and used to analyze the time-domain seismic response in three types of *** the same time,this study also provides numerical simulation results based on the hyperbolic constitutive model and the equivalent linear *** results verify the rationality.of the new soil dynamic constitutive *** can analyze the mucky soil site nonlinear seismic response,reflecting the deformation characteristics and damping effect of the silty *** hysteresis loop area is more extensive,and the residual strain is evident.

关键词： seismic response time-domain dynamic constitutive model logarithmic dynamic skeleton dampening effect mucky soil