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On a Conformally Invariant Integral Equation Involving Poisson Kernel

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Acta Mathematica Sinica,English Series 2018年第4期34卷 681-690页

作者： jin gang XIONG School of Mathematical sciences Beijing Normal University

We study a prescribing involving Poisson kernel on the unit of PDE. As in Nirenberg problem, solutions. We prove existence in the functions problem of a conformally invariant integral equation ball. This integral equation is not the dual of any standard type there exists a Kazdan-Warner type obstruction to existence of antipodal symmetry functions class.

关键词： Poisson kernel conformal invariance blow up analysis

Protein microarray biosensors based on imaging ellipsometry techniques and their applications

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Protein & Cell 2011年第6期2卷 445-455页

作者： Yu Niu gang jin NML Institute of MechanicsChinese Academy of SciencesBeijing 100190China Graduate School of the Chinese Academy of Sciences Beijing 100049China

After years of development,biosensors based on imaging ellipsometry and biosensors based on total internal reflection imaging ellipsometry have been successfully implemented in various engineering *** experimental set... 详细信息

关键词： biosensor protein microarray imaging ellipsometry total internal reflection imaging ellipsometry applications

Study on deformation mechanism of Ti-2Al-2.5Zr alloy tube in the flattening test

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Journal of Materials Science & Technology 2021年第31期90卷 108-120页

作者： Shengkun Wang gang jin Yuntao Wu Xiao Liu gang Chen School of Chemical Engineering and Technology Tianjin UniversityTianjin 300350China Nuclear and Radiation Safety Center MEE54#Beijing 100082China School of Chemical Engineering Sichuan UniversitySichuan 610065China Nuclear Power Institute of China ChengduSichuan 610015China

The flattening test,using one pair paralleled plates to flatten tube structure radially,is generally employed to examine the ductility of tube used in once through steam generator(OTSG).This study focuses on the stress condition and deformation mechanism analysis on the concentrated stress regions of Ti-2 Al-2.5 Zr alloy tube during the flattening ***,the finite element analysis was performed using the commercial software ABAQUS to determine the stress ***,the Electron BackScattered Diffraction(EBSD)was implemented to observe the microstructure evolution of Ti-2 Al-2.5 Zr ***,Schmid law was employed to analyze the activated deformation mechanism under condition of the complex *** was found that the condition of the complex stress in stress concentration regions,including tension and compression regions,can be simplified into two directional stresses *** grains whose c-axis is nearly towards TD and ND,the strain is mainly accommodated by prismatic slip,whereas in grains whose c-axis deviates about 45°from ND to TD mainly by basal ***{10-12}extensive twin and corresponding parent grain orientation mainly relied on the stress ***,the intergranular twin pairs connected at common grain boundaries(GBs)with high strain compatibility were found at low angle GBs,which were activated under a combination of macro stress and strain compatibility effect.

关键词： Ti-2Al-2.5Zr alloy tube Flattening test EBSD Stress condition Deformation mechanism Schmid factor Twin pairs Strain compatibility effect

Modeling dual-scale epidemic dynamics on complex networks with reaction diffusion processes

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Journal of Zhejiang University-Science C(Computers and Electronics) 2014年第4期15卷 265-274页

作者： Xiao-gang jin Yong MIN AI Institute in College of Computer Science and Technology Zhejiang University College of Computer Science and Technology Zhejiang University of Technology

The frequent outbreak of severe foodborne diseases(e.g., haemolytic uraemic syndrome and Listeriosis) in 2011 warns of a potential threat that world trade could spread fatal pathogens(e.g., enterohemorrhagic Escherichia coli). The epidemic potential from trade involves both intra-proliferation and inter-diffusion. Here, we present a worldwide vegetable trade network and a stochastic computational model to simulate global trade-mediated epidemics by considering the weighted nodes and edges of the network and the dual-scale dynamics of epidemics. We address two basic issues of network structural impact in global epidemic patterns:(1) in contrast to the prediction of heterogeneous network models, the broad variability of node degree and edge weights of the vegetable trade network do not determine the threshold of global epidemics;(2) a ‘penetration effect', by which community structures do not restrict propagation at the global scale, quickly facilitates bridging the edges between communities, and leads to synchronized diffusion throughout the entire network. We have also defined an appropriate metric that combines dual-scale behavior and enables quantification of the critical role of bridging edges in disease diffusion from widespread trading. The unusual structure mechanisms of the trade network model may be useful in producing strategies for adaptive immunity and reducing international trade frictions.

关键词： Worldwide trade networks Foodbome diseases Scale-free networks Mean-field analysis

MELINIKOV’S METHOD FOR NON-LINER ROLLING MOTIONS OF A FLOODED SHIP

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Journal of Hydrodynamics 2005年第5期17卷 580-584页

作者： PU jin-yun ZHANG Wei-kang jin Tao JI gang College of Ship and Power University of Naval Engineering Wuhan 430033 China

To investigate the rolling motions of a flooded ship, non linear coupled dynamics of roll and flooded water are derived using Lagrange＇s principle. Decoupling the coupied equations gives a single-freedom ordinary differential equation, which can describe the rolling motion of the flooded ship. Melinkov＇s method is used to predict the chaos behavior of the ship. Numerical computations are performed for three statuses of a ship model. The comparison of the results shows that the more cabins flooded, the more likely a chaos phenomenon will appear.

关键词： ship flooding roll Melinikov' method

A method for neutron-induced gamma spectra decomposition analysis based on Geant4 simulation

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维普期刊数据库

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Nuclear Science and Techniques 2022年第12期33卷 36-48页

作者： Wei Tang jin-gang Liang Yi Ge Qiong Zhang University of Electronic Science and Technology of China Chengdu 610000China Tsinghua University Beijing 10000China

In various monitoring and detection tools that use pulsed neutron generators as radiation sources,the gamma rays induced by the interaction with various nuclei at different stages of neutron transport can reflect information about the *** gamma rays are generated in two major interactions:inelastic scattering of fast neutrons and radiative capture of thermal neutrons,corresponding to the inelastic and capture gamma rays,***,the two types of gamma rays that reflect different properties of the medium are difficult to collect by normal detectors *** proportion of the two gamma rays needs to be solved for the separation of inelastic and capture ***,this study proposes an optimized spectra decomposition method to calculate the inelastic-to-capture ratio in the measured total gamma spectra based on the net inelastic and capture spectra obtained using the Geant4 *** the simulated data cannot reflect the energy resolution of the measured spectra,we introduce the Gaussian broadening function of the gamma detector while calculating the proportion of the spectra components,and achieve optimization of the proportion values and resolution parameters *** on the results,the total simulated spectra obtained by superimposing the broadened net inelastic and capture gamma spectra according to the calculated inelastic-to-capture ratio are in good agreement with their measured counterpart.

关键词： Neutron-induced gamma Geant4 Spectra analysis

MODELING, VALIDATION AND OPTIMAL DESIGN OF THE CLAMPING FORCE CONTROL VALVE USED IN CONTINUOUSLY VARIABLE TRANSMISSION

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Chinese Journal of Mechanical Engineering 2008年第4期21卷 51-55页

作者： ZHOU Yunshan LIU jin＇gang CAIYuanchun ZOU Naiwei State Key Laboratory of Advanced Design and Manufacturing for Vehicle Body Hunan University Changsha 410082 China College of Automotive Engineering Jilin University Changchun 130022 China

Associated dynamic performance of the clamping force control valve used in continuously variable transmission （CVT） is optimized. Firstly, the structure and working principle of the valve are analyzed, and then a dynamic model is set up by means of mechanism analysis. For the purpose of checking the validity of the modeling method, a prototype workpiece of the valve is manufactured for comparison test, and its simulation result follows the experimental result quite well. An associated performance index is founded considering the response time, overshoot and saving energy, and five structural parameters are selected to adjust for deriving the optimal associated performance index. The optimization problem is solved by the genetic algorithm （GA） with necessary constraints. Finally, the properties of the optimized valve are compared with those of the prototype workpiece, and the results prove that the dynamic performance indexes of the optimized valve are much better than those of the prototype workpiece.

关键词： Dynamic modeling Optimal design Genetic algorithm Clamping force control valve Continuously variable transmission (CVT)

A comprehensive simulation of weak-light phase-locking for space-borne gravitational wave antenna

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Science China(Technological Sciences) 2016年第5期59卷 730-737页

作者： DONG YuHui LIU HeShan LUO ZiRen LI YuQiong jin gang National Microgravity Laboratory (NML) Institute of Mechanics Chinese Academy of Sciences Beijing 100190 China University of Chinese Academy of Sciences Beijing 100190 China QUEST Centre of Quantum Engineering and Space-Time Research Leibniz Universitat Hannover Hannover 30167 Germany Max-Planck-Institude for Gravitational Physics (Albert Einstein Institute) Hannover 30167 Germany

A comprehensive simulation was performed to better understand the impacts and effects of the additional technical noises on weak-light phase-locking for LISA. The result showed that the phase of the slave laser tracked well with the received transmitting light under different noise level, and the locking precision was limited by the phase readout noise when the laser frequency noise and clock jitter noise were removed. This result was then confirmed by a benchtop experimental test. The required LISA noise floor was recovered from the simulation which proved the validity of the simulation program. In order to convert the noise function into real time data with random characteristics, an algorism based on Fourier transform was also invented.

关键词： weak-light phase-locking gravitational wave detection heterodyne laser interferometer

Identification and functional analysis of heterogeneous FOXP3^+ Treg cell subpopulations in human pancreatic ductal adenocarcinoma

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Science Bulletin 2018年第15期63卷 972-981页

作者： gang Yi Shiwei Guo Wenyu Liu Huan Wang Rendong Liu Andy Tsun gang jin Bin Li Shanghai Key Laboratory of Bio-energy Crops School of Life Science Shanghai University Shanghai Institute of Immunology Shanghai Jiao Tong University School of Medicine Department of Immunology and Microbiology Shanghai Jiao Tong University School of Medicine CAS Center for Excellence in Molecular Cell Science Unit of Molecular Immunology Institute Pasteur of Shanghai Shanghai Institutes for Biological Sciences University of Chinese Academy of Sciences Medical School Chinese Academy of Sciences Department of General Surgery Changhai Hospital Second Military Medical University

CD4^＋ CD25^＋ regulatory T （Treg） cells express the transcription factor FOXP3 and play an essential role in preventing autoimmunity. Abundant Treg cell accumulation in tumors and tumor draining lymph nodes （TDLNs） has been reported to correlate with both poor and favorable prognosis in various cancers, which suggests that Tregs may have multiple effects on antitumor immunity. However, the heterogeneity of tumor- and TDLN-infiltrating Treg cells remains unclear. Here we provide heterogeneity analysis of tumor infiltrating human CD4^＋ Treg cells and their matched adjacent tissues and TDLNs. We defined three different subpopulations of tumor- and TDLN-infiltrating Treg cells by Helios and CCR8 expression in pancreatic ductal adenocarcinoma （PDAC） and confirmed their functional heterogeneity. Helios^＋ CCR8^＋ Treg cells with potent suppressor function and limited IL-2 and IFN-7 secretion were identified in tumors and TDLNs. On the contrary, Helios^- CCR8^- Treg cells have impaired suppressive activity, and elevated expression of pro-inflammatory cytokines. More advanced grades of PDAC have predominantly Helios^＋ CCR8^＋ Treg cells and few Helios^- CCR8^- Treg cells both in tumors and TDLNs that suggests poor prognosis. These data could help further define the role of Treg cells and their functional role in tumors and TDLNs.

关键词： Pancreatic ductal adenocarcinoma Regulatory T cells Heterogeneity Tumor draining lymph nodes