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Applied Mathematics and Mechanics(English Edition) 2021年第12期42卷 1799-1816页

作者： xuhui wang Nanjing HUANG Department of Mathematics Sichuan UniversityChengdu 610064China

The leaderless and leader-following finite-time consensus problems for multiagent systems(MASs)described by first-order linear hyperbolic partial differential equations(PDEs)are *** Lyapunov theorem and the unique solvability result for the first-order linear hyperbolic PDE are used to obtain some sufficient conditions for ensuring the finite-time consensus of the leaderless and leader-following MASs driven by first-order linear hyperbolic ***,two numerical examples are provided to verify the effectiveness of the proposed methods.

关键词： finite-time consensus hyperbolic partial differential equation(PDE) leaderless multi-agent system(MAS) leader-following MAS boundary control

Preliminary geological interpretation of long-wavelength magnetic anomalies over China and surrounding regions

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Earth and Planetary Physics 2024年第3期8卷 445-458页

作者： Jie wang YanYan Yang ZhiMa Zeren Jian wang Xin wang YuXin Luo xuhui Shen National Institute of Natural Hazards Ministry of Emergency Management of ChinaBeijing 100085China Key Laboratory of Compound and Chained Natural Hazards Dynamics Ministry of Emergency Management of ChinaBeijing 100085China School of Emergency Management Science and Engineering University of Chinese Academy of SciencesBeijing 100049China National Space Science Center Chinese Academy of SciencesBeijing 100190China

Long-wavelength(>500 km)magnetic anomalies originating in the lithosphere were first found in satellite magnetic *** to the striking magnetic anomalies around the world,the long-wavelength magnetic anomalies in China and surrounding regions are relatively *** research on each of these anomalies has been quite inadequate;their geological origins remain unclear,in particular their connection to tectonic activity in the Chinese and surrounding *** focus on six magnetic high anomalies over the(1)Tarim Basin,(2)Sichuan Basin(3)Great Xing’an Range,(4)Barmer Basin,(5)Central Myanmar Basin,and(6)Sunda and Banda Arcs,and a striking magnetic low anomaly along the southern part of the Himalayan-Tibetan *** have analyzed their geological origins by reviewing related research and by detailed comparison with geological *** tectonic backgrounds for these anomalies belong to two cases:either ancient basin basement,or subduction-collision ***,the geological origins of large-scale regional magnetic anomalies are always subject to dispute,mainly because of limited surface exposure of sources,later tectonic destruction,and superposition of multi-phase events.

关键词： long-wavelength magnetic anomaly lithospheric magnetic anomaly lithospheric magnetic field model satellite magnetic survey CSES

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内蒙古A级景区空间结构演变及可达性研究

技术与市场 2024年第1期31卷 173-179页

作者：孟建伟唐兵王旭辉张宏立林英华聊城大学地理与环境学院山东聊城252000 聊城大学历史与文化旅游学院山东聊城252000 聊城大学黄河学研究院山东聊城252000

旅游景区是以开展旅游活动为主要功能的空间地域,是推动旅游业发展的物质条件,景区的空间分布特征和可达性对于旅游业的发展有着重要的影响。将内蒙古自治区现有的428个A级旅游景区作为研究对象,分析内蒙古A级景区的时空分布和变化特征... 详细信息

旅游景区是以开展旅游活动为主要功能的空间地域,是推动旅游业发展的物质条件,景区的空间分布特征和可达性对于旅游业的发展有着重要的影响。将内蒙古自治区现有的428个A级旅游景区作为研究对象,分析内蒙古A级景区的时空分布和变化特征,并通过内蒙古路网数据分析景区可达性。结果表明:内蒙古A级旅游景区在空间上自西向东总体呈现出疏密交错分布格局,各地级市之间分布的景区数量差异较大;内蒙古A级旅游景区在大部分地级市呈现出集聚分布的空间特点,但在分布的均衡度上不佳;2010-2022年间,内蒙古A级景区的分布核心保持不变,形成了以呼包鄂为核心集中分布,其他次核心分散分布的格局;内蒙古A级旅游景区在空间上大体呈东北方向,基本与内蒙古地形保持一致,离散程度大,2010-2022年分布重心逐渐向经济发展较好的呼包地区转移;内蒙古A级景区的可达性大体呈现出“中间强、两边弱”的格局,道路密度是影响可达性的重要因素。

关键词： A级景区时空分布可达性内蒙古

An Adaptive Collocation Method with Weighted Extended PHT-Splines

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Journal of Systems Science & Complexity 2021年第1期34卷 47-67页

作者： NI Qian DENG Jiansong wang xuhui School of Mathematical Sciences University of Science and Technology of ChinaHefei 230026China School of Mathematics Hefei University of TechnologyHefei 230009China

This paper presents an adaptive collocation method with weighted extended *** authors modify the classification rules for basis functions based on the relation between the basis vertices and the computational domain. The Gaussian points are chosen to be collocation points since PHT-splines are C1 continuous. The authors also provide relocation techniques to resolve the mismatch problem between the number of basis functions and the number of interpolation conditions. Compared to the traditional Greville collocation method, the new approach has improved accuracy with fewer oscillations. Several numerical examples are also provided to test our the proposed approach.

关键词： Collocation method Gaussian points PHT-splines weighted extended PHT-splines

Factors Influencing the Spatial Variability of Air Temperature Urban Heat Island Intensity in Chinese Cities

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Advances in Atmospheric Sciences 2024年第5期41卷 817-829页

作者： Heng LYU Wei wang Keer ZHANG Chang CAO Wei XIAO xuhui LEE Key Laboratory of Meteorological Disaster Ministry of Education(KLME)/Collaborative Innovation Center on Forecast and Evaluation of Meteorological Disasters(CIC-FEMD)/Key Laboratory of Ecosystem Carbon Source and SinkChina Meteorological Administration(ECSS-CMA)/Jiangsu Key Laboratory of Agricultural MeteorologyNanjing University of Information Science&TechnologyNanjing 210044China Key Laboratory of Urban Meteorology China Meteorological AdministrationBeijing 100089China School of the Environment Yale UniversityNew HavenCT 06511USA

Few studies have investigated the spatial patterns of the air temperature urban heat island(AUHI)and its controlling *** this study,the data generated by an urban climate model were used to investigate the spatial variations of the AUHI across China and the underlying climate and ecological drivers.A total of 355 urban clusters were *** performed an attribution analysis of the AUHI to elucidate the mechanisms underlying its *** results show that the midday AUHI is negatively correlated with climate wetness(humid:0.34 K;semi-humid:0.50 K;semi-arid:0.73 K).The annual mean midnight AUHI does not show discernible spatial patterns,but is generally stronger than the midday *** urban–rural difference in convection efficiency is the largest contributor to the midday AUHI in the humid(0.32±0.09 K)and the semi-arid(0.36±0.11 K)climate *** release of anthropogenic heat from urban land is the dominant contributor to the midnight AUHI in all three climate *** rural vegetation density is the most important driver of the daytime and nighttime AUHI spatial variations.A spatial covariance analysis revealed that this vegetation influence is manifested mainly through its regulation of heat storage in rural land.

关键词： air temperature urban heat island spatial variations biophysical drivers Chinese cities climate model

Interval optimal power flow applied to distribution networks under uncertainty of loads and renewable resources

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Journal of Modern Power Systems and Clean Energy 2019年第1期7卷 139-150页

作者： Pengwei CHEN Xiangning XIAO xuhui wang North China Electric Power University Hefei University of Technology

Optimal power flow(OPF) has been used for energy dispatching in active distribution *** satisfy constraints fully and achieve strict operational bounds under the uncertainties from loads and sources, this paper derives an interval optimal power flow(I-OPF)method employing affine arithmetic and interval Taylor *** enhanced I-OPF method based on successive linear approximation and second-order cone programming is developed to improve solution *** proposed methods are benchmarked against Monte Carlo simulation(MCS) and stochastic *** on a modified IEEE 33-bus system and a real 113-bus distribution network validate the effectiveness and applicability of the proposed methods.

关键词： Active distribution network Optimal power flow Interval uncertainty Affine arithmetic Second-order cone programming

Multi-field Coupled Inverse Hall–Petch Relations for Ferroelectric Nanocrystals

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Acta Mechanica Solida Sinica 2024年第1期37卷 139-147页

作者： Xiaodong Zhang Wei Yan xuhui Lou Yujun Chen Zhihong Zhou Qingyuan wang Lianhua Ma Xiaobao Tian Non-Destructive Testing Laboratory School of Quality and Technical SupervisionHebei UniversityBaoding 071002China AVIC Huiyang Aviation Propeller Co. LtdBaoding 071051China Department of Mechanics and Engineering Sichuan UniversityChengdu 610065China Yibin Institute of Industrial Technology Sichuan University Yibin ParkYibin 644000China Research Institute of Interdisciplinary Sciences(RISE) Dongguan University of TechnologyDongguan 523808China School of Materials Science and Engineering Dongguan University of TechnologyDongguan 523808China

Tailoring grain size can improve the strength of polycrystals by regulating the proportion of grains to grain boundaries and the interaction *** the grain size decreases to the nanoscale,the deformation mechanism in polycrystals shifts from being primarily mediated by dislocations to deformation occurring within the grains and grain ***,the mechanism responsible for fine-grain strengthening in ferroelectric materials remains unclear,primarily due to the complex multi-field coupling effect arising from spontaneous *** molecular dynamics simulations,we investigate the strengthening mechanism of barium titanate(BaTiO3),with extremely fine-grain *** material exhibits an inverse Hall–Petch relationship between grain size and strength,rooting in the inhomogeneous concentration of atomic strain and grain ***,we present a theoretical model to predict the transition from the inverse Hall–Petch stage to the Hall–Petch stage based on strength variations with size,which aligns well with the simulation *** has been found that the piezoelectric properties of the BaTiO3 are affected by polarization domain switching at various grain *** study enhances our understanding of the atomic-scale mechanisms that contribute to the performance evolution of fine-grain nano-ferroelectric *** also provides valuable insights into the design of extremely small-scale ferroelectric components.

关键词： Ferroelectrics Multi-field coupling Molecular dynamics Fine-grain reinforcement Inverse Hall-Petch effect

LW25-252型断路器气动阀体密封圈检修(检验)方法

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农村电气化 2024年第6期 73-75页

作者：徐成西耿向东南洋王旭晖夏博雅刘育武王昭斐况广耀国网北京市电力公司检修分公司北京丰台100032

某220 kV站内进口设备LW25-252型断路器为单台供气式气动机构,内部气动阀由于存在运行时间较长,密封圈老化导致出现气动阀频繁漏气。文章通过研究该站LW25-252型断路器中VA133、VA134型气动阀,经过对气动阀的拆接、工作原理分析以及各... 详细信息

某220 kV站内进口设备LW25-252型断路器为单台供气式气动机构,内部气动阀由于存在运行时间较长,密封圈老化导致出现气动阀频繁漏气。文章通过研究该站LW25-252型断路器中VA133、VA134型气动阀,经过对气动阀的拆接、工作原理分析以及各部位密封垫作用,确定阀体内活塞杆密封圈为气动阀漏气根源,根据阀体活塞杆结构研制专用工具供拆解、组装阀体,并进一步模拟集中供气模式设计气动阀体检测平台,对修后气动阀进行自测自检,实现对该厂家VA133、VA134型气动阀自拆自修自检,降低对外部厂家援助依赖。

关键词：断路器气动机构气动阀漏气检测装置集中供气

The Epstein-Barr virus-miRNA-BART6-5p regulates TGF-β/SMAD4 pathway to induce glycolysis and enhance proliferation and metastasis of gastric cancer cells

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Oncology Research 2024年第5期32卷 999-1009页

作者： xuhui ZHAO XIAOMIN HUANG CHUNYAN DANG XIA wang YUJIAO QI HONGLING LI The First Clinical Medical College Gansu University of Traditional Chinese MedicineLanzhou730000China Department of Oncology Gansu People’s HospitalLanzhou730000China The Clinical Medical College Ningxia Medical UniversityNingxia750004China

Background:EBV-miR-BARTs exhibit significant relevance in epithelial tumors,particularly in EBVassociated gastric and nasopharyngeal ***,their specific mechanisms in the initiation and progression of gastric cancer remain insufficiently *** and Methods:Initially,EBV-miRNA-BART6-5p and its target gene SMAD4 expression were assessed in EBV-associated gastric cancer tissues and cell *** transfection induced overexpression of EBV-miRNA-BART6-5p in AGS and MKN-45,and downregulation in EBVpositive cells(SUN-719).The subsequent evaluation aimed to observe their impact on gastric cancer cell proliferation,migration,and glycolytic processes,with the TGF-β/SMAD4 signaling pathway value clarified using a TGF-β***:EBV-miRNA-BART6-5p exhibits pronounced upregulation in EBV-associated gastric cancer tissues and EBV-positive cells,while its target gene SMAD4 demonstrates downregulated *** of it can promote the proliferation and migration of gastric cancer ***,We found EBV-miRNA-BART6-5p promotes glycolysis of gastric cancer *** of the TGF-β/SMAD4 signaling pathway resulted in suppressed proliferation and migration of gastric cancer cells,concomitant with a diminished glycolytic ***:In this study,we found that EBV-miRNA-BART6-5p can target SMAD4,effectively increasing glycolysis in gastric cancer cells by regulating the TGF-β/SMAD4 signaling pathway,thereby enhancing the proliferation and metastasis of gastric cancer *** findings may offer new insights into the metabolic aspects of gastric cancer.

关键词： EBV TGF-β/SMAD4 Glycolysis Gastric cancer

qSTA2-2,a novel QTL that contributes to seed starch synthesis in Zea mays L.

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Journal of Integrative Agriculture 2024年第4期23卷 1118-1133页

作者： Minghao Cai xuhui Li Zhi Liang Jie wang Delin Li Zhipeng Yuan Riliang Gu Jianhua wang Li Li State Key Laboratory of Maize Bio-breeding/Key Laboratory of Crop Heterosis Utilization Ministry of Education/Beijing Innovation Center for Crop Seed Technology/College of Agronomy and BiotechnologyChina Agricultural UniversityBeijing 100193China Institute of Nanfan&Seed Industry Guangdong Academy of ScienceGuangzhou 510316China Institute of Crop Sciences Chinese Academy of Agricultural SciencesBeijing 100081China

The seed storage materials accumulate during seed development,and are essential for seed germination and seedling *** we employed two bi-parental populations of an F2:3 population developed from a cross of improved 220(I220,small seeds with low starch)and PH4CV(large seeds with high starch),as well as recombinant-inbred lines(RILs)of X178(high starch)and its improved introgression line I178(low starch),to identify the genes that control seed storage *** identified a total of 12 QTLs for starch,protein and oil,which explained 3.44-10.79%of the phenotypic *** them,qSTA2-1 identified in F2:3 and qSTA2-2 identified in the RILs partially overlapped at an interval of 7.314-9.554 Mb,and they explained 3.44-10.21%of the starch content variation,so they were selected for further *** mapping of qSTA2-2 with the backcrossed populations of ^(I220)/PH4CV in each generation narrowed it down to a 199.7 kb interval that contains 14 open reading frames(ORFs).Transcriptomic analysis of developing seeds from the near-isogenic lines(NILs)of ^(I220)/PH4CV(BC_(5)F_(2))showed that only 11 ORFs were expressed in 20 days after pollination(DAP)*** of them were upregulated and six of them were downregulated in NIL^(I220),and the differentially expressed genes(DEGs)between NIL^(I220) and NIL^(PH4CV) were enriched in starch metabolism,hormone signal transduction and glycosaminoglycan *** the eleven NIL^(I220) differential expressed ORFs,ORF4(Zm00001d002260)and ORF5(Zm00001d002261)carry 75%protein sequence similarity,both encodes an glycolate oxidase,were the possible candidates of *** analysis and validation indicated that mutation of the qSTA2-2 locus resulted in the dysfunction of ABA accumulation,the embryo/endosperm ratio and the starch and hormone levels.

关键词： QTL mapping seed starch transcriptomic analysis hormone