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Existence of Weak Solutions to the Three-dimensional Steady Compressible Magnetohydrodynamic Equations

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Acta Mathematica Sinica,English Series 2012年第12期28卷 2431-2442页

作者： Chun hui zhou Department of Mathematics Southeast University LCP Institute of Applied Physics and Computational Mathematics

The purpose of this paper is to prove the existence of a spatially periodic weak solution to the steady compressible isentropic MHD equations in R3 for any specific heat ratio γ〉 1. The proof is based on the weighted estimates of both pressure and kinetic energy for the approximate system which result in some higher integrability of the density, and the method of weak convergence. According to the author＇s knowledge, it is the first result that treats in three dimensions the existence of weak solutions to the steady compressible MHD equations with γ〉1.

关键词： Steady compressible Magnetohydrodynamic equations existence for γ〉 1 weighted estimate viscous flux

Measuring Available Bandwidth for Smart Cyber-Physical Applications

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Tsinghua Science and Technology 2011年第6期16卷 601-610页

作者： hui zhou College of Information Science and Technology Hainan University Haikou 570228 China

The powerful processors and the variety of sensors in new and upcoming mobile Internet devices, such as iPhones and Android-based smart phones, can be leveraged to build cyber-physical applications that collect sensor data from the real world and communicate it back to the Internet for comprehensive processing. Available bandwidth measurement has been discussed previously in the computer networking community. Currently, it is important for cyber-physical applications to behave smartly since these applications prefer small data packets, short round-trip times, and sudden bursts of traffic. A new available bandwidth measurement technique for cyber-physical applications, SOProbe, was introduced and its accuracy was verified through ns-2 simulation. The experimental data indicate that this methodology can enable the gateway node to measure the available bandwidth of a path at low cost.

关键词： cyber-physical application mobile computing sensor network

Multifunctional carbon materials from rugose rose for energy storage and water purification

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Frontiers of Chemical Science and Engineering 2024年第9期18卷 1-13页

作者： Peng-hui Li hui zhou Wen-Juan Wu Jiangsu Co-Innovation Center of Efficient Processing and Utilization of Forest Resources Nanjing Forestry UniversityNanjing 210037China College of Light Industry and Food Engineering Nanjing Forestry UniversityNanjing 210037China College of Chemical Engineering East China University of Science and TechnologyShanghai 200237China State Key Laboratory of Chemical Engineering Shanghai 200237China

With the advancement of social process,the resource problem is becoming more prominent,biomass materials come into being,and it is becoming more and more important to explore and prepare efficient and multifunctional biomass materials to alleviate the problems of energy storage and water *** this paper,nitrogen-doped hierarchical porous carbon materials(NRRC)were produced by one-step carbonization of withered rose as raw material and melamine as nitrogen source with KOH-activated *** resulting nitrogen-doped porous carbon material had the most abundant pores and the best microspherical graded pore structure,with a specific surface area of up to 1393 m2·g^(-1),a pore volume of 0.68 cm3·g^(-1),and a nitrogen-doped content of 5.52%.Electrochemical tests showed that the maximum specific capacitance of NRRC in the three-electrode system was 346.4 F·g^(-1)(0.5 A·g^(-1)),which was combined with favorable capacitance retention performance and cycling *** NRRC//NRRC symmetric supercapacitors were further assembled,and the maximum energy density of a single device was 23.88 Wh·kg^(-1),which still maintains excellent capacitance retention and cyclic charging/discharging *** example,the capacitance retention rate was always close to 96.27%with almost negligible capacitance loss after 10000 consecutive charge/discharge cycles(current density:10 A·g^(-1)).Regardless of the three-electrode or two-electrode system,the super capacitive performance of NRRC porous carbon materials was comparable to the electrochemical performance of many reported biomass porous carbon materials,which showed better energy storage advantages and practical application *** addition,NRRC porous carbon materials had excellent water purification *** dye adsorption test confirmed that NRRC had a high adsorption capacity(491.47 mg·g^(-1))for methylene *** undoubtedly also showed a potential and promising avenue for high value-added utilization

关键词： rose carbon adsorption electrode material electrochemical performance

Tetrabromobisphenol A(TBBPA): A controversial environmental pollutant

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Journal of Environmental Sciences 2020年第11期32卷 54-66页

作者： hui zhou Nuoya Yin Francesco Faiola State Key Laboratory of Environmental Chemistry and Ecotoxicology Research Center for Eco-Environmental SciencesChinese Academy of SciencesBeijing 100085China College of Resources and Environment University of Chinese Academy of SciencesBeijing 100049China

Tetrabromobisphenol A(TBBPA)is one of the most widely used brominated flame retardants and is extensively used in electronic equipment,furniture,plastics,and *** is frequently detected in water,soil,air,and organisms,including humans,and has raised concerns in the scientific community regarding its potential adverse health *** exposure to TBBPA is mainly via diet,respiration,and skin *** in vivo and in vitro studies based on animal and cell models have demonstrated that TBBPA can induce multifaceted effects in cells and animals,and potentially exert hepatic,renal,neural,cardiac,and reproductive ***,other reports have claimed that TBBPA might be a safe *** this review,we re-evaluated most of the published TBBPA toxicological assessments with the goal of reaching a conclusion about its potential *** concluded that,although low TBBPA exposure levels and rapid metabolism in humans may signify that TBBPA is a safe chemical for the general population,particular attention should be paid to the potential effects of TBBPA on early developmental stages.

关键词： Tetrabromobisphenol A(TBBPA) Developmental toxicity Endocrine disrupting chemicals(EDC) Hepatotoxicity Neurotoxicity

Gorenstein AC-Projective and AC-Injective Modules over Formal Triangular Matrix Rings

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Algebra Colloquium 2022年第3期29卷 475-490页

作者： Dejun Wu hui zhou Department of Applied Mathematics Lanzhou University of Technology Lanzhou 730050China

Let A and B be rings and U a(B,A)-*** BU is flat and UA is finitely generated projective(resp.,BU is finitely generated projective and UA is flat),then the characterizations of level modules and Gorenstein AC-projective modules(resp.,absolutely clean modules and Gorenstein AC-injective modules)over the formal triangular matrix ring T=(A0 UB)are *** applications,it is proved that every Gorenstein AC-projective left T-module is projective if and only if each Gorenstein AC-projective left A-module and B-module is projective,and every Gorenstein AC-injective left T-module is injective if and only if each Gorenstein AC-injective left A-module and B-module is ***,Gorenstein AC-projective and AC-injective dimensions over the formal triangular matrix ring T are studied.

关键词： formal triangular matrix ring Gorenstein AC-projective module level module absolutely clean module

Spiralchord: a space-filling curve based location awareness, cross-layering P2P file sharing system in WMNs

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The Journal of China Universities of Posts and Telecommunications 2012年第3期19卷 44-53页

作者： zhou hui YANG Jie School of Information Engineering Wuhan University of TechnologyWuhan 436000China

The common characteristics of peer-to-peer （P2P） overlay networks and wireless multi-hop network, such as self-organization, decentralization, hop-by-hop message transmission mode and high degree of dynamicity, lead to research of operating wired P2P applications on wireless multi-hop networks. Wireless mesh network （WMN） as a relative static multi-hop wireless network which is extended from Ad-Hoc networks, has become one of the key technologies for providing increased network coverage of Internet infrastructures. This paper investigates the problem of enabling P2P file sharing in WMNs. A special chord algorithm--spiralchord is proposed to address the major problem in wireless file sharing system how to efficiently find resources currently available. Spiralchord put forward an identifier （ID） assignment technique based on spiral space-filling curve to integrate location-awareness with cross-layering. Location awareness aims at alleviating the mismatch of physical network topology and overlay network topology, and requires close-by IDs in logical ring of neighboring peers, while cross-layering aims at speeding up resource lookup operations, requires faraway IDs of neighboring peers. Spiralchord uses spiral curve to assign peers＇ IDs which meet the contradictory requirements of location-awareness and cross-layering. The simulation results show spiralchord is effective in reducing message overhead, and increasing lookup performance with respect to basic chord.

关键词： P2P WMN space-filling curve location awareness cross-layering

Deep active sampling with self-supervised learning

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Frontiers of Computer Science 2023年第4期17卷 221-223页

作者： Haochen SHI hui zhou College of Electronic and Information Engineering Nanjing University of Aeronautics and AstronauticsNanjing 211106China College of Computer Science and Technology Nanjing University of Aeronautics and AstronauticsNanjing 211106China

1 ***,some research efforts[1]have tried to combine selfsupervised learning and active learning to reduce the cost of labeling ***,this method is difficult to effectively improve the model performance because it does not consider the feature representation performance of the examples on the pretext *** order to overcome this shortcoming,we propose a deep active sampling framework with self-supervised representation learning.

关键词： tried learning overcome

Numerical investigation of particle deposition on converging slot-hole film-cooled wall

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Journal of Central South University 2017年第12期24卷 2819-2828页

作者： zhou Jun-hui ZHANG Jing-zhou College of Energy and Power Engineering Nanjing University of Aeronautics and AstronauticsNanjing 210016 China Jiangsu Province Key Laboratory of Aerospace Power System Nanjing 210016 China

Numerical research on the dilute particles movement and deposition characteristics in the vicinity of converging slot-hole(console) was carried out, and the effect of hole shape on the particle deposition characteristics was investigated. The EI-Batsh deposition model was used to predict the particle deposition characteristics. The results show that the console hole has an obvious advantage in reducing particle deposition in comparison with cylindrical hole, especially under higher blowing ratio. The coolant jet from console holes can cover the wall well. Furthermore, the rotation direction of vortices near console hole is contrary to that near cylindrical hole. For console holes, particle deposition mainly takes place in the upstream area of the holes.

关键词： gas–solid flow particle deposition film-cooled wall converging slot film cooling hole numerical simulation

Circulation in the South China Sea is in a state of forced oscillation:Results from a simple reduced gravity model with a closed boundary

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Acta Oceanologica Sinica 2022年第7期41卷 1-12页

作者： Rui Xin Huang hui zhou Woods Hole Oceanographic Institution Woods HoleFalmouthMassachusetts02543USA Key Laboratory of Ocean Circulation and Waves Institute of OceanologyChinese Academy of SciencesQingdao266071China Laboratory for Ocean Dynamics and Climate Pilot National Laboratory for Marine Science and Technology(Qingdao)Qingdao266237China University of Chinese Academy of Sciences Beijing100049China

The South China Sea(SCS)is a narrow semi-enclosed basin,ranging from 4°–6°N to 21°–22°N *** is forced by a strong annual cycle of monsoon-related wind *** Coriolis parameter f increases at least three times from the southern basin to the northern *** a result,the basin-cross time for the first baroclinic Rossby wave in the southern part of the basin is about 10-times faster than that in the northern part,which plays the most vitally important role in setting the *** the northernmost edge of SCS,the first baroclinic Rossby wave takes slightly less than 1 year to move across the basin,however,it takes only 1–2 months in the southernmost ***,circulation properties for a station in the model ocean are not solely determined by the forcing at that time instance only;instead,they depend on the information over the past *** combination of a strong annual cycle of wind forcing and large difference of basin-cross time for the first baroclinic Rossby wave leads to a strong seasonal cycle of the circulation in the SCS,hence,the circulation is dominated by the forced oscillations,rather than the quasi-steady state discussed in many *** circulation in the SCS is explored in detail by using a simple reduced gravity model forced by seasonally varying zonal wind *** particular,for a given time snap the western boundary current in the SCS cannot play the role of balancing mass transport across each latitude nor balancing mechanical energy and vorticity in the whole *** a departure from the steady wind-driven circulation discussed in many existing textbooks,the circulation in the SCS is characterized by the imbalance of mechanical energy and vorticity for the whole basin at any part of the seasonal *** particular,the western boundary current in the SCS cannot balance the mass,mechanical energy,and vorticity in the seasonal cycle of the ***,the circulation near the western boundary cannot be i

关键词： South China Sea ocean circulation annual cycle first baroclinic Rossby wave propagation western boundary current forced ossilation