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Weak cosmic censorship conjecture and thermodynamics in quintessence Ad S black hole under charged particle absorption

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Chinese Physics C 2019年第12期43卷 169-179页

作者： Ke-Jian He xin-yun hu Xiao-Xiong Zeng Physics and Space College China West Normal UniversityNanchong 637000China College of Economic and Management Chongqing Jiaotong UniversityChongqing 400074China State Key Laboratory of Mountain Bridge and Tunnel Engineering Chongqing Jiaotong UniversityChongqing 400074China Department of Mechanics Chongqing Jiaotong UniversityChongqing 400074China

Considering the cosmological constant as the pressure,this study addresses the laws of thermodynamics and weak cosmic censorship conjecture in the Reissner-Nordstrom-AdS black hole surrounded by quintessence dark energy under charged Particle *** first law of thermodynamics i5 found to be valid as a Particle is absorbed by the black *** second law,however,is violated for the extremal and near-extremal black holes,because the entropy of these black hole ***,we find that the extremal black hole does not change its configuration in the extended phase space,implying that the weak cosmic censorship conjecture is ***,the near-extremal black hole can be overcharged beyond the extremal condition under charged particle ***,the cosmic censorship conjecture could be violated for the near-extremal black hole in the extended phase *** comparison,we also discuss the first law,second law,and the weak cosmic censorship conjecture in normal phase space,and find that all of them are valid in this case.

关键词： thermodynamics weak cosmic censorship conjecture quintessence AdS black hole

Thermodynamics and weak cosmic censorship conjecture of charged AdS black hole in the Rastall gravity with pressure

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Chinese Physics B 2020年第5期29卷 142-148页

作者： xin-yun hu Ke-Jian He Zhong-hua Li Guo-Ping Li College of Economic and Management Chongqing Jiaotong UniversityChongqing 400074China Physics and Space College China West Normal UniversityNanchong 637000China

Treating the cosmological constant as a dynamical variable,we investigate the thermodynamics and weak cosmic censorship conjecture(WCCC)of a charged AdS black hole(BH)in the Rastall *** determine the energy momentum relation of charged fermion at the horizon of the BH using the Dirac *** on this relation,it is shown that the first law of thermodynamics still holds as a fermion is absorbed by the ***,the entropy of both the extremal and near-extremal BH decreases in the irreversible process,which means that the second law of thermodynamics is ***,we verify the validity of the WCCC by the minimum values of the metric function h(r)at its final *** the extremal charged AdS BH in the Rastall gravity,we find that the WCCC is always valid since the BH is *** for the case of near-extremal BH,we find that the WCCC could be violable in the extended phase space(EPS),depending on the value of the parameters of the BH and their variations.

关键词： Rastall gravity extended phase space black hole thermodynamics weak cosmic censorship conjecture

Thermodynamics and weak cosmic censorship conjecture of an AdS black hole with a monopole in the extended phase space

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Chinese Physics C 2020年第5期44卷 133-139页

作者： xin-yun hu Ke-Jian He Xiao-Xiong Zeng Jian-Pin Wu College of Economic and Management Chongqing Jiaotong UniversityChongqing 400074China Physics and Space College China West Normal UniversityNanchong 637000China Department of Mechanics Chongqing Jiaotong UniversityChongqing 400074China Center for Gravitation and Cosmology College of Physical Science and TechnologyYangzhou UniversityYangzhou 225009China

The first law of black hole thermodynamics has been shown to be valid in the extended phase ***,the second law and the weak cosmic censorship conjecture have not been investigated *** investigate the laws of thermodynamics and the weak cosmic censorship conjecture of an AdS black hole with a global monopole in the extended phase space in the case of charged particle *** is shown that the first law of thermodynamics is valid,while the second law is violated for the extremal and near-extremal black ***,we find that the weak cosmic censorship conjecture is valid only for the extremal black hole,and that it can be violated for the near-extremal black holes,which is different from the previous results.

关键词： weak cosmic censorship conjecture thermodynamics global monopole black holes

Holographic Einstein ring of a charged Rastall AdS black hole with bulk electromagnetic field

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Chinese Physics C 2024年第11期48卷 120-137页

作者： M.Israr Aslam Xiao-Xiong Zeng Rabia Saleem xin-yun hu Department of Mathematics COMSATS University IslamabadLahore CampusLahore-54000 Pakistan State Key Laboratory of Mountain Bridge and Tunnel Engineering Chongqing Jiaotong UniversityChongqing 400074China Department of Mechanics Chongqing Jiaotong UniversityChongqing 400074China College of Economic and Management Chongqing Jiaotong UniversityChongqing 400074China

We study the Einstein images of a charged Rastall AdS black hole(BH)within the fabric of AdS/CFT *** the holographic setup,we analyze the amplitude of the total response function for various values of model *** an increase in parameterλand temperature T,the amplitude of the response function decreases,while it increases with an increase in electric charge e and chemical potentialμ.The influence of frequencyωalso plays an important role in the bulk field,as it is found that decreasingωleads to an increase in the periods of the waves,which means that the amplitude of the response function also depends on the wave *** relation between T and the inverse of the horizon for various values of parameterλis interpreted under fixed values of other involved ***,in turn,affect the behavior of the response function and the Einstein ring,which may be used to differentiate the present study from previous *** construct the holographic images of the BH in bulk via a special optical *** results show that the Einstein ring always appears with concentric stripes at the position of the north pole,and this ring transforms into a luminosity-deformed ring or bright light spot when the distant observer lies away from the north ***,we discuss the influence of the associated parameters on the Einstein ring radius,which is consistent with wave optics.

关键词： Rastall gravity AdS/CFT correspondence Black hole Einstein rings

Dynamics of holographic images of scalar-tensor-vector gravity-AdS black holes

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Chinese Physics C 2024年第9期48卷 274-290页

作者： xin-yun hu M.Israr Aslam Rabia Saleem Xiao-Xiong Zeng College of Economic and Management Chongqing Jiaotong UniversityChongqing 400074China Department of Mathematics COMSATS University IslamabadLahore-CampusLahore 54000 Pakistan State Key Laboratory of Mountain Bridge and Tunnel Engineering Chongqing Jiaotong UniversityChongqing 400074China Department of Mechanics Chongqing Jiaotong UniversityChongqing 400074China

Using AdS/CFT correspondence,we analyze the holographic Einstein images via the response function of the complex scalar field as a probe wave on an AdS Schwarzschild scalar-tensor-vector gravity(STVG)black hole(BH).We find that the amplitude of the response function||decreases with increasing values of coupling parameter a and increases with decreasing temperature *** frequencyωof the wave source also plays a significant role in wave periods;as we increase the values ofω,the periods of waves decrease,indicating that the total response function closely depends on the wave ***,we investigate the optical appearance of the holographic images of the BH in *** found that the holographic ring always appears with surrounding concentric stripes when the observer is located at the north pole,and an extremely bright ring appears when the observer is at the position of the photon sphere of the *** ring changes into a luminosity-deformed ring or a bright light spot as the observational angle *** corresponding brightness profiles show that the luminosity of the ring decreases and the shadow radius increases with increasing values of *** relation between temperature T and the inverse of the horizonh_e is discussed;T is small at the beginning of the horizon he and then increases as the horizon radius *** effect can be used to distinguish the STVG BH solution from other BH ***,these significant features are also reflected in the Einstein ring and corresponding brightness *** addition,we compare the results obtained by wave optics and geometric optics,which align well,implying that the holographic scheme adopted in this study is valid.

关键词： scalar-tensor-vector gravity shadows AdS/CFT correspondence

Spatial-temporal distribution and emission of urban scale air pollutants in Hefei based on Mobile-DOAS

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Journal of Environmental Sciences 2025年第5期151卷 238-251页

作者： Zhidong Zhang Pinhua Xie Ang Li Min Qin Jin Xu Zhaokun hu xin Tian Feng hu Yinsheng Lv Jiangyi Zheng Youtao Li School of Environmental Science and Optoelectronic Technology University of Science and Technology of ChinaHefei 230026China Key Laboratory of Environmental Optics and Technology Anhui Institute of Optics and Fine MechanicsHefei Institutes of Physical ScienceChinese Academy of SciencesHefei 230031China University of Chinese Academy of Sciences Beijing 100049China Information Materials and Intelligent Sensing Laboratory of Anhui Province Institutes of Physical Science and Information TechnologyAnhui UniversityHefei 230601China

As a significant city in the Yangtze River Delta regions,Hefei has experienced rapid changes in the sources of air pollution due to its high-speed economic development and urban ***,there has been limited research in recent years on the spatial-temporal distribution and emission of its atmospheric *** address this,this study conducted mobile observations of urban roads using the Mobile-DOAS instrument from June 2021 to May *** monitoring results exhibit a favourable consistent with TROPOMI satellite data and ground monitoring station ***,there were pronounced seasonal variations in air ***,high concentration of HCHO and NO_(2)were closely associated with traffic congestion on roadways,while heightened SO_(2)levels were attributed to winter heating and industrial *** study also revealed that with the implementation of road policies,the average vehicle speed increased by 95.4%,while the NO concentration decreased by 54.4%.In the estimation of urban NO_(x)emission flux,it was observed that in temporal terms,compared with inventory data,the emissions calculated viamobile measurements exhibitedmore distinct seasonal patterns,with the highest emission rate of 349 g/sec in winter and the lowest of 142 g/sec in *** spatial terms,the significant difference in emissions between the inner and outer ring roads also suggests the presence of the city’s primary NO_(x)emission sources in the area between these two *** study offers data support for formulating the next phase of air pollution control measures in urban areas.

关键词： Mobile-DOAS HCHO NO_(2) SO_(2) Spatial-temporal distribution NOx emission

Stable partial nitrification was achieved for nitrogen removal from municipal wastewater by gel immobilization:A pilot-scale study

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Journal of Environmental Sciences 2025年第5期151卷 529-539页

作者： xin hu Hong Yang Xiaoyue Fang Xuyan Liu Jiawei Wang Xiaotong Wang Yongsheng Bai Bojun Su Key Laboratory of Beijing for Water Quality Science and Water Environmental Recovery Engineering Faculty of ArchitectureCivil and Transportation EngineeringBeijing University of TechnologyBeijing 100124China Beijing General Municipal Engineering Design&Research Institute Co. Ltd.Beijing 100044China Hebei GEO University Shijiazhuang 050031China Hebei Key Laboratory of Water Quality Engineering and Comprehensive Utilization of Water Resources Hebei University of ArchitectureZhangjiakou 075000China School of Environmental Science and Safety Engineering Tianjin University of TechnologyTianjin 300384China Beijing Drainage Group Co.Ltd. Beijing 100022China

As an energy and carbon saving process for nitrogen removal from wastewater,the partial nitrification and denitrification process(PN/D)has been extensively ***,achieving stable PNinmunicipalwastewater has always been *** this study,a gel immobilized PN/D nitrogen removal process(GI-PN/D)was established.A 94 days pilot-scale experiment was conducted using real municipal wastewater with an ammonia concentration of 43.5±5.3mg N/L at a temperature range of 11.3–28.7◦*** nitrogen removal performance and associated pathways,shifts in the microbial community as well as sludge yield were *** results were as follows:the effluent TN and COD were 0.6±0.4mg/L and 31.1±3.8 mg/L respectively,and the NAR exceeding 95%.GI-PN/D achieved deep nitrogen removal ofmunicipalwastewater through stable PN without taking any *** primary pathways for nitrogen removal were identified as denitrification,simultaneous nitrification-denitrification,and aerobic ***-throughput sequencing analysis revealed that the immobilized fillers facilitated the autonomous enrichment of functional bacteria in each reactor,effectively promoting the dominance and stability of the microbial *** addition,GI-PN/D had the characteristic of low sludge yield,with an average sludge yield of 0.029 kg SS/kg *** study provides an effective technical for nitrogen removal from municipal wastewater through PN.

关键词： Gel immobilization Partial nitrification Deep nitrogen removal Autonomous enrichment Sludge yield

Effect of surface species on the alcohol-acid adsorption from FTS wastewater on graphene:A structure-capacity study

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Journal of Environmental Sciences 2025年第3期149卷 651-662页

作者： Xiao Liu Xiaolong Zhang Chunyu Geng Qinglan Hao Jie Chang xin hu Yongwang Li Botao Teng Tianjin Key Laboratory of Brine Chemical Engineering and Resource Eco-utilization College of Chemical Engineering and Materials ScienceTianjin University of Science and TechnologyTianjin 300457China State Key Laboratory of Medicinal Chemical Biology Key Laboratory of Functional Polymer MaterialsCollege of ChemistryNankai UniversityTianjin 300071China National Energy Center for Coal to Liquids Synfuels China Co.Ltd.Beijing 101407China Institute of Sustainability of Chemical Energy and EnvironmentAgency for ScienceTechnology and Research627833Singapore Key Laboratory of the Ministry of Education for Advanced Catalysis Materials Zhejiang Normal UniversityJinhua 321004China

Fischer-Tropsch synthesis(FTS)wastewater retaining low-carbon alcohols and acids are organic pollutants as a limiting factor for FTS *** this work,the structurecapacity relationships between alcohol-acid adsorption and surface species on graphene were reported,shedding light into their intricate *** graphene oxide(GO)and reduced graphene oxide(rGO)were synthesized via improved hummers method with flake graphite(G).The physicochemical properties of samples were characterized via SEM,XRD,XPS,FT-IR,and *** alcohol-acid adsorption behaviors and adsorption quantities on G,GO,and rGO weremeasured via theoretical and *** was revealed that the presence of COOH,C=O and C–O species on graphene occupy the adsorption sites and increase the interactions of water with graphene,which are unfavorable for alcoholacid *** equilibrium adsorption quantities of alcohols and acids grow in pace with carbon *** monolayer adsorption occurs on graphene was verified viamodel *** has the highest FTS modeling wastewater adsorption quantity(110 mg/g)due to the reduction of oxygen *** novel findings provide a foundation for the alcoholacid wastewater treatment,as well as the design and development of high-performance carbon-based adsorbent materials.

关键词： Alcohol-acid adsorption Fischer-Tropsch synthesis wastewater Graphene Surface species Density functional theory

Risk diagnosis model for high-speed rail safety operation in big-data environment

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Journal of Traffic and Transportation Engineering(English Edition) 2025年第01期 12-22页

作者： Qizhou hu xin Guan Xiaoyu Wu School of Automation Nanjing University of Science and Technology

Aiming at the risk issue of high-speed rail(HSR) safety operation, big data technology and uncertain mathematical method are adopted to study it. Firstly, from the perspective of system science, the risk diagnosis mode of HSR safety operation is put forward, which mainly includes the operation environment diagnosis mode based on multivariate product,high-speed train diagnosis mode based on failure influence, staff diagnosis mode based on management conditions, track diagnosis mode based on probability safety, etc. And based on comprehensive analysis, the conventional risk diagnosis index system is *** the dynamic diagnosis index system based on principal component analysis is proposed, and the risk diagnosis model of HSR safety operation is established. The diagnosis model can quickly evaluate the operation situations of HSR, and the diagnosis results are conducive to grasping the situation of risk events quickly and accurately, so as to meet the timeliness requirements of emergency decision-making. Finally, to verify the effectiveness of this new model, the Beijing-Shanghai HSR is selected as a case study. The analysis results show that the diagnosis model can quickly diagnose the safety operation situation of HSR, simplify the evaluation process and improve the efficiency of the comprehensive evaluation of emergencies.

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