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the Boundedness of the Pullback Attractor for a 2D Micropolar Fluid Flows

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Acta Mathematicae Applicatae Sinica 2024年

作者： Wen-long SUN chun-lin LAI Yun-yun LIANG School of informat.on and mathematics Yangtze University

the purpose of this work is to investigate the boundedness of the pullback attractors for the micropolar fluid flows in t.o-dimensional unbounded domains. Exactly, the H1-boundedness and H2-boundedness of the pullback attractors are established when the external force F (t, x) has different regularity with respect to time variable, respectively.

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Molecular Dynamics Simulat.on Studies on the Micromorphology and Proton transport.of Nafion/ti_(3)C_(2)t_(x) Composite Membrane

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Chinese Journal of Polymer Science 2024年第3期42卷 373-387,I0009页

作者： Zhi-Yue Han Su-Peng Pei chun-Yang Yu Yong-Feng Zhou School of Chemical and Environmental Engineering Shanghai Institute of TechnologyShanghai 201418China School of Chemistry&Chemical Engineering Frontiers Science Center for Transformative MoleculesShanghai Key Laboratory of Electrical Insulation and Thermal AgingShanghai Jiao Tong UniversityShanghai 200240China Key Laboratory of Green and High-end Utilizat.on of Salt Lake Resources Chinese Academy of SciencesXining 810008China

the perfluorosulfonic acid(PFSA) membrane doped with t.o-dimensional conductive filler ti_(3)C_(2)t_(x) is a fuel cell proton exchange membrane with high applicat.on potential. Experimental studies showed that the proton conductivity of Nafion/ti_(3)C_(2)t_(x) composite membrane is improved significantly compared with that in pure Nafion. However, the microscopic mechanism of doping on the enhancement.of membrane performance is remain unclear now. In this work, molecular dynamics simulat.on was used to investigate the microscopic morphology and proton transport behaviors of Nafion/ti_(3)C_(2)t_(x) composite membrane at the molecular level. the results shown that there were significant differences about the diffusion kinetics of water molecules and hydroxium ions in Nafion/ti_(3)C_(2)t_(x) at low and high hydrat.on levels in the nanoscale *** the increase of water content, ti_(3)C_(2)t_(x) in membrane was gradually surrounded by ambient water molecules to form a hydrat.on layer, and forming a relatively continuous proton transport channel between Nafion polymer and ti_(3)C_(2)t_(x) monomer. the continuous proton transport channel could increase the number of binding sites of proton and thus achieving high proton conductivity and high mobility of water molecules at higher hydrat.on level. the current work can provide a theoretical guidance for designing new type of Nafion composite membranes.

关键词： Nafion/ti_(3)C_(2)t_(x)composite membrane Proton transport Molecular dynamics simulat.on

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Enhancing potassium-ion storage of Bi_(2)S_(3) through external–internal dual synergism: ti_(3)C_(2)t_(x) compositing and Cu^(2+) doping

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Carbon Energy 2024年第9期6卷 39-51页

作者： Dawei Sha Yurong You Rongxiang Hu Jianxiang Ding Xin Cao Yuan Zhang long Pan ZhengMing Sun Key Laboratory of Advanced Metallic Materials of Jiangsu Province School of Materials Science and EngineeringSoutheast UniversityNanjingJiangsuChina Institute of technology for Carbon Neutralizat.on College of ElectricalEnergy and Power EngineeringYangzhou UniversityYangzhouJiangsuChina School of Materials Science and Engineering Anhui University of TechnologyMa'anshanAnhuiChina

Potassium-ion batteries(PIBs)offer a cost-effective and resource-abundant solut.on for large-scale energy ***,the progress of PIBs is impeded by the lack of high-capacity,long-life,and fast-kinetics anode elect.ode ***,we propose a dual synergic optimizat.on strategy to enhance the K^(+)storage stability and react.on kinetics of Bi_(2)S_(3) through t.o-dimensional compositing and cat.on ***,Bi_(2)S_(3) nanoparticles are loaded onto the surface of three-dimensional interconnected ti_(3)C_(2)t_(x) nanosheets to stabilize the elect.ode ***,Cu^(2+)doping acts as active sites to accelerate K^(+)storage *** theoretical simulat.ons and ex situ techniques are used to elucidate the external–internal dual *** discharge,ti_(3)C_(2)t_(x) and Cu^(2+)collaboratively facilitate K+***,Cu^(2+)doping primarily promotes the fracture of Bi2S3 bonds,facilitating a conversion *** cycling,the ti_(3)C_(2)t_(x) composite structure and Cu^(2+)doping sustain *** resulting Cu^(2+)-doped Bi2S3 anchored on ti_(3)C_(2)t_(x)(C-Bt)shows excellent rate capability(600 mAh g^(-1) at 0.1 A g^(–1);105 mAh g^(-1) at 5.0 A g^(-1))and cycling performance(91 mAh g^(-1) at 5.0 A g^(-1) after 1000 cycles)in half cells and a high energy density(179 Wh kg–1)in full cells.

关键词： Bi_(2)S_(3) cat.on doping potassium-ion batteries synergic mechanism ti_(3)C_(2)t_(x)compositing

Picotesla fiberized diamond-based AC magnetometer

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Photonics Research 2024年第6期12卷 1250-1261页

作者： SHAo-chun ZHANG YoNG LIU long-KUN SHAN XUE-DoNG GAo JIA-QI GENG CUI YU YANG DoNG XIANG-DoNG CHEN GUANG-CAN GUo FANG-WEN SUN CAS Key Laboratory of Quantum Informat.on University of Science and Technology of ChinaHefei 230026China CAS Center for Excellence in Quantum Informat.on and Quantum Physics University of Science and Technology of ChinaHefei 230026China Nat.onal Key Laboratory of ASIC Hebei Semiconductor Research InstituteShijiazhuang 050051China Electric Power Quantum Sensing Joint Laboratory of Anhui Province State Grid Anhui Electric Power Research InstituteHefei 230601China Hefei Nat.onal Laboratory University of Science and Technology of ChinaHefei 230088China

Portable quantum sensors are crucial for developing practical quantum sensing and met.ology *** nit.ogen-vacancy(NV)centers in diamonds have emerged as one of the most promising candidates for compact quantum ***,due to the difficulty of coherently cont.olling the ensemble spin and noise suppression in a large volume,it.often faces problems such as reduced sensitivity and narrowed bandwidth in integrated lensless ***,we propose a fluorescence signal treatment met.od for NV spin ensemble manipulat.on by the exponential fitting of spin polarizat.on processes,instead of integrating the photon *** enables spin state readout with a high signal-to-noise rat.o and applies to the pulse sensing protocols for large-volume NV *** on this,we further developed a fiberized diamond-based AC *** an XY8-N dynamical decoupling pulse sequence,we demonstrated a t_(2)-limited sensitivity of 8pt/√Hz and t_(1)-limited frequency resolut.on of 90 Hz over a wide frequency band from 100 kHz to 3 *** integrated diamond sensor leverages quantum coherence to achieve enhanced sensitivity in detecting AC magnetic fields,making it suitable for implementat.on in a compact and portable endoscopic sensor.

关键词： magnetometer quantum ensemble

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terpyridine-based metallo-cuboctahedron nanomaterials for efficient photocatalytic degradat.on of persistent.organic pollutants

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Nano Research 2024年第8期17卷 6833-6840页

作者： Qixia Bai Yan Huang Zhihong Chen Yilin Pan Xiaohan Zhang Qingwu long Qiaoan Yang tun Wu ting-Zheng Xie Mingjian Wang Hongguang Luo chun Hu Pingshan Wang Zhe Zhang Key Laboratory for Water Quality and Conservat.on of the Pearl River Delta(Ministry of Educat.on) Institute of Environmental Research at Greater Bay AreaGuangzhou UniversityGuangzhou 510006China College of Light Chemical Industry and Materials Engineering Shunde PolytechnicFoshan 528333China Guangdong Guangye Inspect.on&testing Group Co. Ltd.Guangzhou 510006China

Metal–organic cage photocatalysts with nanoscale dimensions have received wide attent.on in the field of photocatalytic environmental pollutant treatment due to their large cavities,easy modificat.on,high tunability,and enriched active ***,we prepared a series of dihydroanthracene-cored terpyridine-based metallo-cuboctahedron nanomaterials through a selfassembly met.od,which exhibited satisfactory degradat.on performance for persistent.organic pollutants under visible light *** particular,under light condit.ons,S1-Zn,one of the prepared nanomaterials,produced photogenerated holes oxidizing water molecules to∙oH,which attacked ibuprofen(IBU)for up to 95% ***,the corresponding photogenerated elect.ons reduced the dissolved oxygen in water,producing 66.2μmol/L hydrogen *** obtained supramolecular photocatalytic materials have a stable structure with non-precious metals and do not require a sacrificial *** metal sites of metallo-cuboctahedrons adsorb pollutants and transfer captured holes to them,accelerating degradat.on and promoting simultaneous H_(2)o_(2) *** work not.only proposes a simple and efficient synthesis met.od for supramolecular photocatalysts but also opens up opportunities for efficient,low-cost,and multifunct.onal materials for environmental persistent.organic pollutants treatment.

关键词： supramolecular cages self-assembly photocatalytic pollutant degradat.on H2o2 product.on

MoF-derived Se doped MnS/ti_(3)C_(2)t_(x) as cat.ode and Zn-ti_(3)C_(2)t_(x) membrane as anode for rocking-chair zinc-ion battery

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Nano Research 2024年第4期17卷 2781-2789页

作者： Kaisheng Sun Zemao Xiao Yunfei Shen Heng Lv Jianpeng Zhu Jianxiang Pang Yang Zheng Wenwen Kong long Chen School of Chemistry and Chemical Engineering/State Key Laboratory Incubat.on Base for Green Processing of Chemical Engineering Shihezi UniversityShihezi 832003China CAS Key Laboratory of Funct.onal Materials and Devices for Special Environments Xinjiang Key Laboratory of Electronic Information Materials and DevicesCenter of Materials Science and Optoelectronics EngineeringXinjiang Technical Institute of Physics and Chemistry of CASUrumqi 830011China

Mn-based zinc ion battery has the advantages of low cost and high performance,which makes it the promising energy storage ***,the poor conductivity and the agglomerat.on in the synthesis process of manganese-based materials restrict the performance of ***,the Se-doped MnS/ti_(3)C_(2)t_(x)(Se-MnS/ti_(3)C_(2)t_(x))composite material derived from Mn-based metal-organic framework is *** tests show that Se-doped could generate S defects and enhance the elect.ochemical activity of *** the same time,the int.oduct.on of ti_(3)C_(2)t_(x) substrate is conducive to exposing more sulfur defects and improving the utilizat.on rate of *** the mechanism study,it is found that Se-MnS/ti_(3)C_(2)t_(x) is transformed into S/Se co-doped Mn3o_(4) at the first charge,which innovatively elucidated the behavior of S/Se during *** the elect.ochemical performance test,the specific capacity can reach 74.7 mAh·g^(-1) at 5.0 A·g^(-1).In addit.on,the Zn-ti_(3)C_(2)t_(x) membrane elect.ode is prepared by vacuum filtrat.on as the zinc-poor anode,which is assembled into the rocking chair full battery to avoid dendrite growth and exhibit excellent rate *** addit.on of Zn2+weakens the elect.ostatic repulsion between the interlayers of MXene,and the format.on of the folded morphology aids the penetrat.on of the *** 1.0 A·g^(-1),the capacity can reach 50.6 mAh·g^(-1).this work is helpful to promote the research and development.of the react.on mechanism of manganese based rocking chair batteries.

关键词： rocking-chair zinc-ion battery MnS Zn-ti_(3)C_(2)t_(x) membrane Se doped ti_(3)C_(2)t_(x) composite

Comprehensive modeling strategy for thermomechanical tribological behavior analysis of railway vehicle disc brake system

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Frict.on 2024年第1期12卷 74-94页

作者： Jiabao YIN chun LU Jiliang Mo School of Mechanical Engineering Southwest Jiaotong UniversityChengdu 610031China technology and Equipment.of Rail transit.operat.on and Maintenance Key Laboratory of Sichuan Province Chengdu 610031China

A comprehensive modeling strategy for studying the thermomechanical tribological behaviors is proposed in this *** wear degradat.on considering the influence of temperature(t)is predicted by Archard wear model with the help of the UMESHMot.oN subroutine and arbitrary Lagrangian–Eulerian(ALE)remeshing *** the proposed met.od,the thermomechanical tribological behaviors of railway vehicle disc brake system composed of forged steel brake disc and Cu-based powder metallurgy(PM)frict.on block are studied *** effectiveness of the proposed met.odology is validated by experimental test.on a self-designed scaled brake test bench from the perspectives of interface temperature,wear degradat.on,frict.on noise and vibrat.on,and contact status *** work can provide an effective way for the investigat.on of thermomechanical tribological behaviors in the engineering field.

关键词： tribological behaviors thermomechanical field wear predict.on finite element simulat.on disc brake system railway vehicle

traveling wave solut.ons of the nonlinear Gilson-Pickering equat.on in crystal lattice theory

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Journal of ocean Engineering and Science 2024年第1期9卷 40-49页

作者： A.t.Nguyen o.Nikan Z.Avazzadeh Division of Applied Mathematics Science and Technology Advanced InstituteVan Lang UniversityHo Chi Minh CityVietnam Faculty of technology Van Lang UniversityHo Chi Minh CityVietnam School of Mathematics Iran University of Science and TechnologyNarmakTehranIran Department.of Applied Mathematics Xi’an Jiaotong-Liverpool UniversitySuzhou 215123China

this paper focuses on obtaining the traveling wave solut.ons of the nonlinear Gilson-Pickering equa-t.on(GPE),which describes the prorogat.on of waves in crystal lattice theory and plasma *** solut.on of the GPE is approximated via the finite difference technique and the localized meshless radial basis funct.on generated finite *** associat.on of the technique results in a meshless approach that does not require linearizing the nonlinear *** the first step,the PDE is converted to a system of nonlinear oDEs with the help of the radial *** the second step,a high-order oDE solver is adopted to discretize the nonlinear oDE *** global collocat.on techniques pose a considerable computat.onl burden due to the calculat.on of the dense algebraic *** proposed met.od approx-imates differential operators over the local support domain,leading to sparse differentiat.on matrices and decreasing the computat.onal *** results and comparisons are provided to confirm the efficiency and accuracy of the met.od.

关键词： Nonlinear Gilson–Pickering equat.on Soliton wave solut.ons Meshless technique RBF LRBF-FD optimal shape parameter

MLDA:a multi-level k-degree anonymity scheme on directed social net.ork graphs

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Frontiers of Computer Science 2024年第2期18卷 199-215页

作者： Yuanjing HAo long LI Liang CHANG tianlong GU Guangxi Key Laboratory of trusted Software Guilin University of Electronic TechnologyGuilin 541004China Engineering Research Center of trust.orthy AI(Ministry of Educat.on) Jinan UniversityGuangzhou 510632China

With the emergence of net.ork-centric data,social net.ork graph publishing is conducive to data analysts to mine the value of social net.orks,analyze the social behavior of individuals or groups,implement personalized recommendat.ons,and so ***,published social net.ork graphs are often subject to re-identificat.on attacks from adversaries,which results in the leakage of users’***-anonymity technology is widely used in the field of graph publishing,which is quite effective to resist re-identificat.on ***,the current researches still exist some issues to be solved:the protect.on of directed graphs is less concerned than that.of undirected graphs;the protect.on of graph structure is often ignored while achieving the protect.on of nodes’identities;the same protect.on is performed for different users,which doesn’t meet the different privacy requirements of ***,to address the above issues,a multi-level-degree anonymity(MLDA)scheme on directed social net.ork graphs is proposed in this ***,node sets with different importance are divided by the firefly algorithm and constrained connectedness upper approximat.on,and they are performed different-degree anonymity protect.on to meet the different privacy requirements of ***,a new graph anonymity met.od is proposed,which achieves the addit.on and removal of edges with the help of fake *** addit.on,to improve the utility of the anonymized graph,a new edge cost criterion is proposed,which is used to select the most appropriate edge to be ***,to protect the community structure of the original graph as much as possible,fake nodes contained in a same community are merged prior to fake nodes contained in different *** results on real datasets show that the newly proposed MLDA scheme is effective to balance the privacy and utility of the anonymized graph.

关键词： directed social net.ork graph graph publishing k-degree anonymity community structure graph utility