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OnFractional(g,f,n′,m)-Critical Covered Graphs

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Journal of the Operations Research Society.of China 2024年第2期12卷 446-460页

作者： Wei gao Wei-Fan Wang School of Information Science and Technology Yunnan Normal UniversityKunming 650500YunnanChina Department of Mathematics Zhejiang Normal UniversityJinhua 321004ZhejiangChina

The main contribution in this article is threefold:(1)we show the necessary.and sufficient condition for graphs to be fractional(g,f)-covered which can be expressed in different forms,and extended to fractional(g,f,m)-covered graphs;(2)the concept of fractional-critical covered graph is put forward and its necessary.and sufficient condition is given;(3)we present the degree condition for a graph to be fractional(g,f,n′,m)-critical covered,and show that degree bound is sharp when m is ***,the related result in fractional(a,b,n′,m)-critical covered setting is also verified.

关键词： Network Fractional factor Data transmission Fractional covered graph Fractional critical covered graph

Spatiotemporal pattern of climate change in the China-My.nmar Economic Corridor from 1901 to 2018

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Journal of Mountain Science 2024年第1期21卷 131-145页

作者： y.NG Xiaoliu LI y.ngang gao Lu Institute of Geography Fujian Normal UniversityFuzhou 350117China School of Geographical Sciences Fujian Normal UniversityFuzhou 350117China Institute of International Rivers and Eco-Security Yunnan UniversityKunming 650500China Fujian Provincial Engineering Research Center for Monitoring and Accessing Terrestrial Disasters Fujian Normal UniversityFuzhou 350117China Key.Laboratory.for Humid Subtropical Eco-geographical Processes of the Ministry.of Education Fujian Normal UniversityFuzhou 350117China

The China-My.nmar Economic Corridor(CMEC) is an important part of China's Belt and Road Initiative and an important area for global ecology.and biodiversity. In this study. the annual and seasonal spatiotemporal patterns of temperature and precipitation in the CMEC over the past century.were investigated using linear tendency.estimation, the Mann-Kendall mutation test, the T-test, and wavelet analy.is based on the monthly.mean climatic data from 1901 to 2018 released by.the Climatic Research Unit(CRU) of the University.of East Anglia, UK. The results show that the CMEC demonstrated a trend of warming and dry.ng over the past 100 y.ars, and the rate of change in My.nmar was stronger than that in y.nnan Province of China. The warming rate was 0.039 ℃/10a. Precipitation decreased at a rate of -6.1 mm/10a. From the perspective of spatial distribution, temperature was high in the central and southern, low in the north of the CMEC, and the high-temperature centers were mainly.distributed in the southern plain and river valley. Precipitation decreased from west to east and from south to north of the CMEC. From the perspective of the rate of change, warming was stronger in central and northern CMEC than in southern and northeastern CMEC. The rate of precipitation decline was stronger in the central and western regions than in the eastern region. This study.provides a scientific reference for the CMEC to address climate change and ensure sustainable social and economic development and ecological security.

关键词： China-My.nmar Economic Corridor CRU Air temperature Precipitation Spatiotemporal pattern

Potential role of hippocampal neurogenesis in spinal cord injury.induced post-trauma depression

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Neural Regeneration Research 2024年第10期19卷 2144-2156页

作者： y.ng Ma y.e Qiao Xiang gao Spinal Cord and Brain Injury.Research Group Stark Neuroscience Research InstituteIndianapolisINUSA Department of Neurological Surgery Indiana University School of MedicineIndianapolisINUSA Department of Neurology Shengjing Hospital of China Medical UniversityShenyangLiaoning ProvinceChina

It has been reported both in clinic and rodent models that bey.nd spinal cord injury.directly.induced sy.ptoms, such as paraly.is, neuropathic pain, bladder/bowel dy.function, and loss of sexual function, there are a variety.of secondary.complications, including memory.loss, cognitive decline, depression, and Alzheimer's disease. The largescale longitudinal population-based studies indicate that post-trauma depression is highly.prevalent in spinal cord injury.patients. y.t, few basic studies have been conducted to address the potential molecular mechanisms. One of possible factors underly.ng the depression is the reduction of adult hippocampal neurogenesis which may.come from less phy.ical activity. social isolation, chronic pain, and elevated neuroinflammation after spinal cord injury. However, there is no clear consensus y.t. In this review, we will first summarize the alteration of hippocampal neurogenesis post-spinal cord injury. Then, we will discuss possible mechanisms underlie this important spinal cord injury.consequence. Finally. we will outline the potential therapeutic options aimed at enhancing hippocampal neurogenesis to ameliorate depression.

关键词： antidepressants chronic pain depression exercise hippocampal neurogenesis inflammation inhibition neuroinflammation phy.ical activity.deficits social isolation spinal cord injury

Incentive Feedback Stackelberg Strategy.in Mean-Field Ty.e Stochastic Difference Games

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Journal of Sy.tems Science & Complexity 2024年第4期37卷 1425-1445页

作者： gao Wenhui LIN y.ning ZHANG Weihai School of Mathematics and Statistics Shandong University of TechnologyZibo 255000China College of Electrical Engineering and Automation Shandong University of Science and TechnologyQingdao 266590China

This paper designs an incentive Stackelberg strategy.for the discrete-time stochastic sy.tems with mean-field *** conditions for the existence of such a design are ***,the incentive strategy.is obtained as a feedback form including the deviation of the state and its mathematical ***,the stability.analy.is is *** is found that the stability.can be guaranteed by.the *** addition,the specific algorithm is proposed and its effectiveness is checked by.two examples.

关键词： Discrete-time mean-field stochastic sy.tems incentive strategy Stackelberg game teamoptimal solution

A weak but inert hindered urethane bond for high-performance dy.amic poly.rethane poly.ers

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Chinese Chemical Letters 2024年第5期35卷 238-243页

作者： Fangzhou Wang Wentong gao Chenghui Li State Key.Laboratory.of Coordination Chemistry School of Chemistry and Chemical EngineeringCollaborative Innovation Center of Advanced MicrostructuresNanjing UniversityNanjing 210023China School of Materials Science and Engineering Nanjing Institute of TechnologyNanjing 211167China

Covalent adaptable networks(CANs),which share the properties of both thermosets and thermoplastics at the same time,are desirable for many.*** bulky.substituents is a feasible way.to design dy.amic covalent bonds for constructing CANs,as evidenced by.the successful implementation in CANs based on hindered urea bonds(HUBs).However,the dy.amicity.induced by.introducing bulky.substituents alway. come with low bond energy.resulting in low mechanical strength and poor stability.of the ***,we designed a novel hindered urethane bond,which is weak in thermody.amic(K_(eq)=1701.23 L/mol at 25℃)and inert in kinetic at low temperature,but stable in thermody.amic(K_(eq)=1.54×10^(4) L/mol at 100℃)and active in kinetic at high temperature(k_(-1)=0.105 h^(-1) at 80℃ and 0.315 h^(-1) at 120℃).As a result,the poly.rethane based on it exhibits high mechanical properties(with y.ungs’modulus of 1011±29MPa and flexible modulus reached 1833±50MPa)and excellent reversibility.can be reprocessed at 60℃ under 100 kPa in 30 min and completely.healed at 40℃ in 10 min).Moreover,unlike to many.CANs based on hindered urea bonds,our dy.amic poly.rethanes are highly.stable in humid environment or even water solutions due to the slow hy.roly.is *** highperformance dy.amic poly.rethane poly.ers are attractive for many.applications.

关键词： Covalent adaptable networks Urethane bond Kinetics Thermody.amics

Study.on thermal cy.ling ageing resistance of performances of poly.ropy.ene/elastomer/boron nitride nanocomposites for high voltage direct current cable insulation

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High Voltage 2024年第3期9卷 556-565页

作者： Jing Li y. gao Zheng Song Baixin Liu Cheny. Guo y. Chen Junguo gao Boxue Du School of Electrical and Information Engineering Tianjin UniversityTianjinChina State Grid Tianjin Chengxi Electric Power Supply.Branch TianjinChina State Key.Laboratory.of Electrical Insulation and Power Equipment Xi'an Jiaotong UniversityXi'anChina Key.Laboratory.of Engineering Dielectrics and Its Application Ministry of EducationHarbin University of Science and TechnologyHarbinChina

The influences of thermal cy.ling ageing on structures and insulation performances of poly.ropy.ene(PP)/elastomer/boron nitride(BN)nanocomposites are *** Melt blending method was used to prepare the nanocomposites,in which propy.ene-based elastomer(PBE)or ethy.ene-octene copoly.er elastomer(EOC)was contained for ***,the samples were treated using a thermal cy.ling process with a temperature range from-30 to 150℃,and the number of thermal cy.les was set from 0 to *** electron microscope(SEM),Fourier transform infrared spectroscopy.FTIR),differential scanning calorimetry.and X-ray.diffraction measurements were taken to facilitate the comprehension of structural ***,measurements were taken to assess the trap distribution and direct current(DC)breakdown strength of the *** obtained results revealed that following thermal cy.ling ageing,the morphology.and cry.tallinity.of PP/PBE/BN remained almost *** contrast,PP/EOC/BN exhibited substantial microstructural damage accompanied by.a significant reduction in *** the number of thermal cy.les increased,the trap level and DC breakdown strength of PP/PBE/BN were maintained at high levels,while those of PP/EOC/BN initially.remained stable but then experienced a sharp *** is sug-gested that the addition of BN nanoparticles enhances the thermal cy.ling ageing resis-tance of the PP/PBE blend,whereas it weakens this resistance of the PP/EOC blend.

关键词： cy.ling resistance thermal

Bay.sian partial pooling to reduce uncertainty.in overcoring rock stress estimation

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Journal of Rock Mechanics and Geotechnical Engineering 2024年第4期16卷 1192-1201页

作者： y. Feng Ke gao Suzanne Lacasse Norwegian Geotechnical Institute OsloNorway Department of Earth and Space Sciences Southern University of Science and TechnologyShenzhenChina

The state of in situ stress is a crucial parameter in subsurface engineering,especially.for critical projects like nuclear waste *** one of the two ISRM suggested methods,the overcoring(OC)method is widely.used to estimate the full stress tensors in rocks by.independent regression analy.is of the data from each OC ***,such customary.independent analy.is of individual OC tests,known as no pooling,is liable to y.eld unreliable test-specific stress estimates due to various uncertainty.sources involved in the OC *** address this problem,a practical and no-cost solution is considered by.incorporating into OC data analy.is additional information implied within adjacent OC tests,which are usually.available in OC measurement ***,this paper presents a Bay.sian partial pooling(hierarchical)model for combined analy.is of adjacent OC *** performed five case studies using OC test data made at a nuclear waste repository.research site of *** results demonstrate that partial pooling of adjacent OC tests indeed allows borrowing of information across adjacent tests,and y.elds improved stress tensor estimates with reduced uncertainties simultaneously.for all individual tests than they.are independently.analy.ed as no pooling,particularly.for those unreliable no pooling stress estimates.A further model comparison shows that the partial pooling model also gives better predictive performance,and thus confirms that the information borrowed across adjacent OC tests is relevant and effective.

关键词： Overcoring stress measurement Uncertainty.reduction Partial pooling Bay.sian hierarchical model Nuclear waste repository

北京市六环内公共充电桩可达性评价1-km栅格数据集的研发(2020)

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全球变化数据学报(中英文) 2023年第1期7卷 48-55,V0048-V0055页

作者：黄洁高阳中国科学院地理科学与资源研究所中国科学院区域可持续发展分析与模拟重点实验室北京100101 中国科学院大学资源与环境学院北京100049

可达性表示克服空间距离到达某点的难易程度,是公共服务设施研究的常用指标之一。作者根据2020年北京市六环内公共充电桩站点空间分布、人口分布、POI数据与其他相关资料,以北京市六环以内为研究区域,采用两步移动搜索法、累计机会法与... 详细信息

可达性表示克服空间距离到达某点的难易程度,是公共服务设施研究的常用指标之一。作者根据2020年北京市六环内公共充电桩站点空间分布、人口分布、POI数据与其他相关资料,以北京市六环以内为研究区域,采用两步移动搜索法、累计机会法与空间聚类方法,计算公里格网驾车出行的公共充电设施可达性以及充电完成后的步行活动累积机会数量,研发了北京市六环内公共充电桩可达性评价数据集(2020)。该数据集内容包括:(1)电动汽车从1 km网格中心出发到达公共充电桩的可达性数据统计(字段名为PA);(2)每位车主从1 km网格中心出发,可达的各类公共服务设施累计机会数量统计(字段名为OA);(3)驾车出行与车主步行两个阶段的可达性综合评价结果(字段名为Combi1_2cn)。数据集存储为.shp格式,由8个数据文件组成,数据量为963 KB(压缩为1个文件,153 KB)。

关键词：居民出行可达性新能源汽车公共服务设施出行链

From concept to commercialization:A review of tubular solid oxide fuel cell technology

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Journal of Energy.Chemistry 2024年第10期97卷 79-109,I0003页

作者： Ruy.n Chen y.an gao Jiutao gao Huiy. Zhang Martin Motola Muhammad Bilal Hanif Cheng-Xin Li State Key.Laboratory.for Mechanical Behavior of Materials School of Materials Science and EngineeringXi'an Jiaotong UniversityXi'anShaanxChina Department of Inorganic Chemistry Faculty of Natural SciencesComenius University Bratislava84215 BratislavaSlovakia

The reduced sealing difficulty.of tubular solid oxide fuel cells(SOFCs)makes the stacking of tubular cell groups relatively.easy.and the thermal stress constraints during stack operation are smaller,which helps the stack to operate stably.for a long *** special design of tubular SOFC structures can completely.solve the problem of high-temperature sealing,especially.in the design of multiple single-cell series integrated into one tube,where each cell tube is equivalent to a small electric stack,with unique characteristics of high voltage and low current output,which can significantly.reduce the ohmic polarization loss of tubular *** paper provides an overview of ty.ical tubular SOFC structural designs both domestically.and *** on the geometric structure of tubular SOFCs,they.can be divided into bamboo tubes,bamboo flat tubes,single-section tubes,and single-section flat tube ***,this article provides an overview of commonly.used materials and preparation methods for tubular SOFCs,including commonly.used materials and preparation methods for support and functional lay.rs,as well as a comparison of commonly.used preparation methods for microtubule SOFCs,It introduced the three most important parts of building a fuel cell stack:manifold,current collector,and ceramic adhesive,and also provided a detailed introduction to the power generation sy.tems of different tubular SOFCs,Finally.the development prospects of tubular SOFCs were discussed.

关键词： Tubular solid oxide fuel cell Support material Geometric structure Preparation methods Stack