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Topological Entropy of a Graph Map

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Acta Mathematica Sinica,English Series 2018年第2期34卷 194-208页

作者： tai Xiang sun Guangxi Key Laboratory Cultivation Base of Cross-border E-commerce Intelligent Information Processing Guangxi University of Finance and Economics

Let G be a graph and f： G → G be a continuous map. Denote by h（f）, P（f）, AP（f）, R（f） and w（x, f） the topological entropy of f, the set of periodic points of f, the set of almost periodic points of f, the set of recurrent points of f and the w-limit set of x under f, respectively. In this paper, we show that the following statements are equivalent：（1） h（f）〉 O. （2） There exists an x ∈ G such that w（x, f） ∩ P（f） ≠θ and w（x, f） is an infinite set. （3） There exists an x ∈ G such that w（x, f） contains two minimal sets. （4） There exist x, y ∈G such that w（x, f） - w（y, f） is an uncountable set andw（y,f）∩w（x,f）≠θ. （5） There exist anx C Gand a closed subset A w（x,f） with f（A） A such that w（x,f） - A is an uncountable set. （6） R（f） - nP（f） ≠θ. （7） f｜P（f） is not pointwise equicontinuous.

关键词： Topological entropy periodic point w-limit set recurrent point

Maxwell-Chern-Simons Casimir Force in Different Limits

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Communications in Theoretical Physics 2002年第10期38卷 447-448页

作者： zheng tai-Yu Institute of Theoretical Physics Northeast Normal University Changchun 130024 China Center for Theoretical Physics Jilin University Changchun 130023 China Physics Department Faculty of Science Saitama University Saitama 338-8570 Japan

We discuss the Casimir force of Maxwell-Chern-Simons A belian gauge tield in different limits between twoparallel ideal conducting wires by using the Feynman path integral method.

关键词： Casimir effect, free energy, Maxwell-Chern-Simons gauge field, path integral

Long noncoding RNA LINC01106 promotes lung adenocarcinoma progression via upregulation of autophagy

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Oncology research 2025年第1期33卷 171-184页

作者： Gengyun sun Yiping zheng Jianfeng Cai Jie Gao Lie Dong Xiangbin Zhang Yinghui Huang Department of Respiratory and Critical Care Medicine The First Affiliated Hospital of Anhui Medical University Hefei 230022 China. Department of Respiratory and Critical Care Medicine Nanping First Hospital Affiliated to Fujian Medical University Nanping 353006 China.

Background:Long noncoding RNA, LINC01106 exhibits high expression in lung adenocarcinoma (LUAD) tumor tissues, but its functional role and regulatory mechanism in LUAD cells remain unclear.Methods:LINC01106 expression was analyzed in LUAD tissues and its functional impact on LUAD cells was assessed. LUAD cells were silenced with sh-LINC01106 and injected into nude mice to investigate tumor growth. The downstream transcription factors and molecular mechanism were determined using the Human transcription factor database (TFDB) database and Gene Expression Profiling Interactive Analysis (GEPIA) database. Additionally, the impact of linc01106 on autophagy was analyzed by determining the expression of autophagy-related genes (ATGs) in LUAD cells.Results:Our results showed that LINC01106 exhibited upregulation in both LUAD tissues and cell lines. The silencing of LINC01106 demonstrated a suppressive effect on tumorigenesis in a xenograft mouse model of LUAD. Additionally, LINC01106 was found to recruit TATA-binding protein-associated factor 15 (TAF15), an RNA-binding protein, thereby enhancing the mRNA stability of TEA domain transcription factor 4 (TEAD4). In turn, TEAD4 served as a transcription factor that bound to the LINC01106 promoter and regulated its expression. Further assays indicated that LINC01106 promoted autophagy in LUAD cells by upregulating the expression of autophagy-related genes (ATGs). The silencing of LINC01106 in LUAD cells inhibited autophagy, and cell proliferation, and promoted apoptosis, which all were effectively reversed by ATG5 overexpression.Conclusions:Overall, LINC01106, transcriptionally activated by TEAD4, interacts with TAF15 to promote the stability of TEAD4 and upregulates the expression of ATGs, promoting malignancy of LUAD cells.

关键词： ATG5 LINC01106 Lung adenocarcinoma (LUAD) Non-small cell lung cancer (NSCLC) TAF15 TEAD4

Construction of PdS@MIL-125-NH_(2)@ZnS type-Ⅱ heterostructure with efficient charge separation for boosted photocatalytic hydrogen evolution

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Journal of Materials Science & Technology 2023年第14期145卷 116-124页

作者： Zige tai Guotai sun Ting Wang Zhihui Li Jinge tai Research&Development Institute of Northwestern Polytechnical University in Shenzhen Shenzhen 518063China State Key Laboratory for Mechanical Behavior of Materials Xi’an Jiaotong UniversityXi’an 710049China The Second Affiliated Hospital of Air Force Military Medical University Xi’an 710038China

A new photocatalyst,PdS@NH_(2)-MIL-125(Ti)@ZnS(PdS/M125/ZnS)heterojunction is fabricated for photo-catalytic H_(2)generation for the first time,where PdS nanoparticles are anchored in the pore of M125 by utilizing its confinement effect,and the ZnS is closely wrapped on the surfaces of the *** optimal photocatalyst exhibits a significantly enhanced H_(2)generation rate of 1164.2μmol/g/h,while the pure M125 only displays a H_(2)generation rate of 16.7μmol/g/*** resultant improvement can be ascribed to the following comprehensive *** hierarchical structure built by PdS,M125,and ZnS can form lots of intimate interfaces,offer abundant sites for reaction,and smooth channels for charge carri-ers due to the porous characteristics of ***,M125 and ZnS with inner defect levels form an analogous type-II heterojunction assisted by PdS co-catalyst,which greatly promotes charge *** work may supply a new avenue to design MOFs photocatalysts for energy conversion.

关键词： Hydrogen evolution Water splitting Metal-organic framework Defect levels Type-II heterostructure

Evolution and Generation of Dynamics of Two-Mode Squeezed States of Time-Dependent Coupled Boson System

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Communications in Theoretical Physics 2008年第10期50卷 955-960页

作者： ZHANG Xue zheng tai-Yu zheng Li Institute of Theoretical Physics Northeast Normal University Changchun 130000 China College of Information Science and Engineering Dalian Polytechnic University Dalian 116034 China

The system of the Hamiltonian involving a driving part,a single mode part,and a two-mode squeezedone and a two-mode coupled one is discussed using the Lewis-Riesenfeld invariant *** time evolution operatoris *** the initial state is a coherent state,the quantum fluctuation of the system is calculated,and it isdependent on the squeezed part and the two-mode coupled part,but not dependent on the driving one.

关键词： two-mode squeezed states Lewis Riesenfeld invariant theory time evolution operator

Methods for simultaneously evaluating reserve and permeability of undersaturated coalbed methane reservoirs using production data during the dewatering stage

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Petroleum Science 2020年第4期17卷 1067-1086页

作者： Jun-tai Shi Jia-Yi Wu zheng sun Zhi-Hua Xiao Cheng Liu Kamy Sepehrnoori State Key Laboratory of Petroleum Resources and Prospecting China University of Petroleum BeijingNo.18Fuxue RoadChangping DistrictBeijing 102249China MOE Key Laboratory of Petroleum Engineering China University of Petroleum BeijingNo.18Fuxue RoadChangping DistrictBeijing 102249China PetroChina Coalbed Methane Company Limited Beijing 100028China PetroChina Zhejiang Oil Field Company Limited Hangzhou 310023China The University of Texas AustinTX 78712USA

In this work,a flowing material balance equation(FMBE) is established for under saturated coalbed methane(CBM) reservoirs,which considers immobile free gas expansion effect at the dewatering *** on the established FMBE,five straight-line methods are proposed to determine the control area,initial water reserve,initial free gas reserve,initial adsorbed gas reserve,original gas in place,as well as permeability at the same ***,the proposed FMBE methods for undersaturated CBM reservoirs are validated against a reservoir simulation software with and without considering free gas ***,the proposed methods are applied in a field case when considering free gas expansion *** cases show that the straight-line relationships for the proposed five FMBE methods are excellent,and good agreements are obtained among the actual reserves and permeabilities and those evaluated by the proposed five FMBE methods,indicating the proposed five FMBE methods are effective and rational for CBM *** show that a small amount of free gas will result in a great deviation in reserve evaluation;hence,the immobile free gas expansion effect should be considered when establishing the material balance equation of undersaturated CBM reservoirs at the dewatering stage.

关键词： Coalbed methane OGIP Permeability evaluation Flowing material balance equation Gas expansion

Reliability ensemble averaging reduces surface wind speed projection uncertainties in the 21st century over China

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Advances in Climate Change Research 2024年第2期15卷 222-229页

作者： zheng-tai ZHANG Chang-Ai XU Key Laboratory for Semi-Arid Climate Change of the Ministry of Education College of Atmospheric SciencesLanzhou UniversityLanzhou 730000China

Accurate prediction of future surface wind speed(SWS)changes is the basis of scientific planning for wind *** studies have projected SWS changes in the 21st century over China on the basis of the multi-model ensemble(MME)of the 6th Coupled Model Intercomparison Project(CMIP6).However,the simulation capability for SWS varies greatly in CMIP6 multi-models,so the MME results still have large *** this study,we used the reliability ensemble averaging(REA)method to assign each model different weights according to their performances in simulating historical SWS changes and project the SWS under different shared socioeconomic pathways(SSPs)in *** results indicate that REA considerably improves the SWS simulation capacity of CMIP6,eliminating the overestimation of SWS by the MME and increasing the simulation capacity of spatial *** spatial correlations with observations increased from 0.56 for the MME to 0.85 for ***,REA could eliminate the overestimation of the SWS by 33%in *** for southeastern China,the SWS generally decreases over China in the near term(2020-2049)and later term(2070-2099),particularly under high-emission *** SWS reduction projected by REA is twice as high as that by the MME in the near term,reaching-4%to-3%.REA predicts a larger area of increased SWS in the later term,which expands from southeastern China to eastern *** study helps to reduce the projected SWS uncertainties.

关键词： Surface wind speed Uncertainty Multi-model ensemble Reliability ensemble averaging CMIP6

An Efficient Particle Subdomain Quadrature Scheme for the Material Point Method

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Acta Mechanica Solida Sinica 2021年第2期34卷 274-285页

作者： zheng sun Xiaornin Zhou School of Civil and Surveying&Mapping Engineering Jiangxi University of Science and TechnologyGanzhou 341000China

The material point method(MPM)has been proved to be an effective numerical method for large deformation ***,the MPM suffers from the cell crossing error as that the material particles are used to represent the deformed material and to perform the particle *** this paper,an efficient subdomain quadrature material point method(sqMPM)is proposed to eliminate the cell crossing error *** particle domain is approximated to be the line segment,rectangle,and cuboid for the one-,two-,and three-dimensional problems,respectively,which are divided into several different subdomains based on the topological relationship between the particle domain and background grid.A single Gauss quadrature point is placed at the center of each subdomain and used for the information *** material quantities of each Gauss quadrature point are determined by the corresponding material particle and the subdomain volume without the cumbersome reconstruction *** examples for one-,two-,and three-dimensional large deformation problems demonstrate the effectiveness and highly enhanced convergence and efficiency of the proposed sqMPM.

关键词： Material point method Cell crossing error Subdomain quadrature Large deformation

Maxwell-Chern-Simons Casimir Force Between Perfectly Conducting Parallel Lines

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Communications in Theoretical Physics 2001年第10期36卷 431-432页

作者： zheng tai-Yu zheng Li LI Chang-Song The Institute of Theoretical Physics Northeast Normal University Changchun 130022 China The Center of Theoretical Physics Jilin University Changchun 130000 China The Institute of Theoretical Physics Northeast Normal University Changchun 130022 China Technique School of Yanbian Yanji 133000 Jilin Province China

Using Feynman path integral method we calculate the Casimir force of Maxwell Chern Simons Abelian gauge field between perfectly conducting parallel lines.

关键词： Casimir force, path integral method, Maxwell Chern Simons gauge field