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Flame-retardant ammonium polyphosphate/MXene decorated carbon foam materials as polysulfide traps for fire-safe and stable lithium-sulfur batteries

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Journal of Energy Chemistry 2024年第2期89卷 313-323,I0008页

作者： Yang Li Yong-cheng Zhu sowjanya Vallem Man Li seunghyun song Tao Chen Long-cheng Tang Joonho Bae Department of Physics Gachon UniversitySeongnam-siGyeonggi-do 13120South Korea key Laboratory of Organosilicon Chemistry and Material Technology of Ministry of Education College of MaterialChemistry and Chemical EngineeringHangzhou Normal UniversityHangzhou 311121ZhejiangChina key laboratory of Advanced Energy Materials Chemistry(Ministry of Education) College of ChemistryNankai UniversityTianjin 300071China school of Materials Engineering Changzhou Vocational Institute of Industry TechnologyChangzhou 213164JiangsuChina

Lithium-sulfur(Li-s)batteries are one of the most promising modern-day energy supply systems because of their high theoretical energy density and low ***,the development of high-energy density Li-s batteries with high loading of flammable sulfur faces the challenges of electrochemical performance degradation owing to the shuttle effect and safety issues related to fire or explosion *** this work,we report a three-dimensional(3D)conductive nitrogen-doped carbon foam supported electrostatic self-assembled MXene-ammonium polyphosphate(NCF-MXene-APP)layer as a heat-resistant,thermally-insulated,flame-retardant,and freestanding host for Li-s batteries with a facile and costeffective synthesis ***,through the use of NCF-MXene-APP hosts that strongly anchor polysulfides,the Li-s batteries demonstrate outstanding electrochemical properties,including a high initial discharge capacity of 1191.6 mA h g^(-1),excellent rate capacity of 755.0 mA h g^(-1)at 1 C,and long-term cycling stability with an extremely low-capacity decay rate of 0.12%per cycle at 2 *** importantly,these batteries can continue to operate reliably under high temperature or flame attack ***,this study provides valuable insights into the design of safe high-performance Li-s batteries.

关键词： Flame-retardant MXene Ammonium polyphosphate safety Lithium-sulfur battery

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A New Vehicle Detection Framework Based on Feature-Guided in the Road scene

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Computers, Materials & Continua 2024年第1期78卷 533-549页

作者： Tianmin Deng Xiyue Zhang Xinxin cheng school of Traffic and Transportation Chongqing Jiaotong UniversityChongqing400074China

Vehicle detection plays a crucial role in the field of autonomous driving ***,directly applying deep learning-based object detection algorithms to complex road scene images often leads to subpar performance and slow inference speeds in vehicle *** a balance between accuracy and detection speed is crucial for real-time object detection in real-world road *** paper proposes a high-precision and fast vehicle detector called the feature-guided bidirectional pyramid network(FBPN).Firstly,to tackle challenges like vehicle occlusion and significant background interference,the efficient feature filtering module(EFFM)is introduced into the deep network,which amplifies the disparities between the features of the vehicle and the ***,the proposed global attention localization module(GALM)in the model neck effectively perceives the detailed position information of the target,improving both the accuracy and inference speed of ***,the detection accuracy of small-scale vehicles is further enhanced through the utilization of a four-layer feature pyramid *** results show that FBPN achieves an average precision of 60.8% and 97.8% on the BDD100k and kITTI datasets,respectively,with inference speeds reaching 344.83 frames/s and 357.14 frames/*** demonstrates its effectiveness and superiority by striking a balance between detection accuracy and inference speed,outperforming several state-of-the-art methods.

关键词： Driverless car vehicle detection channel attention mechanism deep learning

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Double stabilizations and convergence analysis of a second-order linear numerical scheme for the nonlocal Cahn-Hilliard equation

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science China Mathematics 2024年第1期67卷 187-210页

作者： Xiao Li Zhonghua Qiao cheng Wang Department of Applied Mathematics The Hong Kong Polytechnic UniversityHong KongChina Department of Mathematics The University of MassachusettsNorth DartmouthMA 02747USA

In this paper,we study a second-order accurate and linear numerical scheme for the nonlocal CahnHilliard *** scheme is established by combining a modified Crank-Nicolson approximation and the Adams-Bashforth extrapolation for the temporal discretization,and by applying the Fourier spectral collocation to the spatial *** addition,two stabilization terms in different forms are added for the sake of the numerical *** conduct a complete convergence analysis by using the higher-order consistency estimate for the numerical scheme,combined with the rough error estimate and the refined *** regarding the numerical solution as a small perturbation of the exact solution,we are able to justify the discrete?^(∞)bound of the numerical solution,as a result of the rough error ***,the refined error estimate is derived to obtain the optimal rate of convergence,following the established?∞bound of the numerical ***,the energy stability is also rigorously proved with respect to a modified *** proposed scheme can be viewed as the generalization of the second-order scheme presented in an earlier work,and the energy stability estimate has greatly improved the corresponding result therein.

关键词： nonlocal Cahn-Hilliard equation second-order stabilized scheme higher-order consistency analysis rough and refined error estimate

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Current status of early gastric cancer screening research

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Cancer Biology & Medicine 2024年第3期21卷 218-222页

作者： Can Hu Li Yuan Xiangdong cheng Department of Gastric surgery Zhejiang Cancer HospitalHangzhou Institute of Medicine(HIM)Chinese Academy of SciencesHangzhouZhejiang 310022China key Laboratory of Prevention Diagnosis and Therapy of Upper Gastrointestinal Cancer of Zhejiang ProvinceHangzhou 310022China Zhejiang Provincial Research Center for Upper Gastrointestinal Tract Cancer Zhejiang Cancer HospitalHangzhou 310022China

Gastric cancer is a predominant threat to the health and well-being of China's residents. Data from the World Health Organization(WHO) in 2020 revealed that gastric cancer in China notably accounted for 44.0% of new c... 详细信息

关键词： cancer Gastric gastric

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Evolution of inner wall wrinkle defects in the sinking zone of a thick-walled steel tube during radial forging

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Advances in Manufacturing 2024年第2期12卷 396-408页

作者： Yu-Zhao Yang cheng Xu Li-Xia Fan school of Mechanical Engineering Nanjing University of Science and TechnologyNanjing210094People’s Republic of China

An axial wrinkle defect was observed in the inner wall of the sinking zone of a thick-wall steel tube processed by cold radial *** can evolve into *** present study focuses on the evolution of wrinkles and the effects of process parameters on them using a three-dimensional radial forging process finite element model,radial forging experiments,and surface morphology *** results indicated that the vertical section angle of the hammer die and the size of the tube blank significantly affect the evolution of *** height-to-width ratioλwas introduced to describe the morphology of *** had an approximately linear relationship with the radius reduction in the sinking *** was a linear correlation between the growth slope ofλand the axial to circumferential strain ratio|εr/εθ|,which can predict theλunder few process *** the 30siMn2MoVA steel,at the junction of the forging and sinking zones,the threshold ofλof the wrinkle that can evolve into a fissure is approximately 1.123.

关键词： Radial forging Inner wall Wrinkle defects Evolution sinking zone

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A Fluorine-Functionalized 3D Covalent Organic Framework with Entangled 2D Layers

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Chinese Journal of Polymer science 2024年第8期42卷 1210-1216页

作者： Li-Bang Xiao Zi-Han Wu Jun-Jie Xin Yuan-Peng cheng Bo Gui Jun-Liang sun cheng Wang College of Chemistry and Molecular sciences Wuhan UniversityWuhan 430072China College of Chemistry and Molecular Engineering Beijing National Laboratory for Molecular SciencesPeking UniversityBeijing 100871China

Constructing three dimensional(3D)covalent organic frameworks(COFs)through the entanglement of two dimensional(2D)nets is a promising but underdeveloped ***,we report the design and synthesis of a fluorine functionalized 3DCOF(3D-An-COF-F)formed by entangled 2D sql *** structure of 3D-An-COF-F was determined by the combination of continuous rotation electron diffraction technique and modelling based on the chemical information from real ***,compared to the isostructural 3D-An-COF without F atom s,3DAn-COF-F showed an improved CO_(2)sorption ability and higher CO_(2)/N_(2)*** study not only demonstrated the generality of constructing 3D COFs with entangled 2D nets by introducing bulky groups vertically in planar building blocks,but also will expand the diversity of 3D COFs for various applications.

关键词： 3D covalent organic frameworks Fluorine Entangled 2D layers Electron diffraction CO_(2)adsorption

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Effect of La on the Corrosion Behavior and Mechanism of 3Ni Weathering steel in a simulated Marine Atmospheric Environment

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Acta Metallurgica sinica(English Letters) 2024年第2期37卷 308-324页

作者： Gang Niu Rui Yuan R.D.k.Misra Na Gong Zhi-Hui Zhang Hao-Xiu Chen Hui-Bin Wu cheng-Jia shang Xin-Ping Mao Collaborative Innovation Center of steel Technology University of Science and Technology BeijingBeijing100083China Laboratory for Excellence in Advanced steel Research Department of MetallurgicalMaterials and Biomedical EngineeringUniversity of Texas at El PasoEl PasoTX79968USA Institute of Materials Research and Engineering Agency for ScienceTechnologyand ResearchSingapore138634Singapore Department of Materials science and Engineering University of TorontoTorontoONM5S 3E4Canada

The corrosion behavior and mechanism of 3Ni weathering steel in a simulated oceanic atmospheric environment are investigated in order to comprehend the impacts of La,as determined through electrochemical analysis and rust layer *** results of this study demonstrate that the addition of La enhances the corrosion resistance of 3Ni weathering steel in the marine atmospheric environment,thereby reducing the corrosion rate and improving the protection of the rust *** influence of La on corrosion resistance can be attributed to two primary ***,La functions as a grain refiner,minimizing the potential difference of the micro-regions on the substrate surface,thereby significantly reducing the corrosion of bare steel in the marine ***,La inhibits the process of Fe_(3)O_(4) oxidation back toγ-FeOOH during corrosion at the local site,thus decreasing the formation ofγ-FeOOH and enhancing the charge transfer *** research work may serve as a reference for expanding the application of rare earth elements in the field of weathering steel.

关键词： Weathering steel Rare earth Rust layer Corrosion behavior Corrosion resistance

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Classification of complete 3-dimensional self-shrinkers in the Euclidean space R^(4)

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science China Mathematics 2024年第4期67卷 873-882页

作者： Qing-Ming cheng Zhi Li Guoxin Wei Department of Applied Mathematics Faculty of ScienceFukuoka UniversityFukuoka 814-0180Japan College of Mathematics and Information science Henan Normal UniversityXinxiang 453007China school of Mathematical sciences South China Normal UniversityGuangzhou 510631China

In this paper,we completely classify 3-dimensional complete self-shrinkers with the constant norm s of the second fundamental form and the constant f3in the Euclidean space R^(4),where hij’s are components of the sec... 详细信息

关键词： mean curvature ow self-shrinker the generalized maximum principle

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Electron delocalization-enhanced sulfur reduction kinetics on an MXene-derived heterostructured electrocatalyst

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Nano Research 2024年第8期17卷 7153-7162页

作者： Yunmeng Li Yinze Zuo Xiang Li Yongzheng Zhang cheng Ma Xiaomin cheng Jian Wang Jitong Wang Hongzhen Lin Licheng Ling state key Laboratory of Chemical Engineering Key Laboratory of Specially Functional Polymeric Materials and Related Technology(Ministry of Education)East China University of Science and TechnologyShanghai 200237China Institute of New Energy Materials and Engineering College of Materials Science and EngineeringFuzhou UniversityFuzhou 350108China key Laboratory of specially Functional Polymeric Materials and Related Technology(Ministry of Education) School of Materials Science and EngineeringEast China University of Science and TechnologyShanghai 200237China i-Lab&CAs key Laboratory of Nanophotonic Materials and Device suzhou Institute of Nano-Tech and Nano-Bionics Chinese Academy of SciencesSuzhou 215123China Helmholtz Institute Ulm(HIU) D89081 UlmGermany

Lithium-sulfur(Li-s)batteries mainly rely on the reversible electrochemical reaction of between lithium ions(Li^(+))and sulfur species to achieve energy storage and conversion,therefore,increasing the number of free Li^(+)and improving the Li^(+)diffusion kinetics will effectively enhance the cell ***,Mo-based MXene heterostructure(Mos_(2)@Mo_(2)C)was developed by partial vulcanization of Mo_(2)C MXene,in which the introduction of similar valence s into Mo-based MXene(Mo_(2)C)can create an electron delocalization *** theoretical simulations and electrochemical characterisation,it is demonstrated that the Mos_(2)@Mo_(2)C heterojunction can effectively promote ion desolvation,increase the amount of free Li^(+),and accelerate Li^(+)transport for more efficient polysulfide *** addition,the Mos_(2)@Mo_(2)C material is also capable of accelerating the oxidation and reduction of polysulfides through its sufficient defects and vacancies to further enhance the catalytic ***,the Li-s battery with the designed Mos_(2)@Mo_(2)C electrocatalyst performed for 500 cycles at 1 C and still maintained the ideal capacity(664.7 mAh·g^(−1)),and excellent rate performance(567.6 mAh·g^(−1)at 5 C).Under the extreme conditions of high loading,the cell maintained an excellent capacity of 775.6 mAh·g^(−1)after 100 *** also retained 838.4 mAh·g^(−1)for 70 cycles at a low temperature of 0℃,and demonstrated a low decay rate(0.063%).These results indicate that the delocalized electrons effectively accelerate the catalytic conversion of lithium polysulfide,which is more practical for enhancing the behaviour of Li-s batteries.

关键词： delocalized electron lithium sulfur batteries MXene-based heterostructures catalytic desolvation multi-catalytic sites

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safety and effectiveness of butorphanol in epidural labor analgesia:A protocol for a systematic review and meta-analysis

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World Journal of Clinical Cases 2024年第8期12卷 1416-1421页

作者： Guan-cheng Tang Man He Zhen-Zhao Huang Yan cheng Department of Anesthesiology Yongkang Hospital of Traditional Chinese MedicineJinhua 321301Zhejiang ProvinceChina Department of Gynecology and Obstetrics Yongkang Hospital of Traditional Chinese MedicineJinhua 321301Zhejiang ProvinceChina Department of Anesthesiology Hangzhou United Liger Sixth Medical Beauty HospitalHangzhou 311215Zhejiang ProvinceChina Department of Ultrasound Hangzhou Women’s HospitalHangzhou 310008Zhejiang ProvinceChina

BACkGROUND Epidural analgesia is the most effective analgesic method during *** administered epidurally has been shown to be a successful analgesic method during ***,no comprehensive study has examined the safety and efficacy of using butorphanol as an epidural analgesic during *** To assess butorphanol's safety and efficacy for epidural labor *** The PubMed,Cochrane Library,EMBAsE,Web of science,China National knowledge Infrastructure,and Google scholar databases will be searched from *** types of literature,such as conference abstracts and references to pertinent reviews,will also be *** will include randomized controlled trials comparing butorphanol with other opioids combined with local anesthetics for epidural analgesia during *** will be no language *** primary outcomes will include the visual analog scale score for the first stage of labor,fetal effects,and Apgar *** independent reviewers will evaluate the full texts,extract data,and assess the risk of *** bias will be evaluated using Egger's or Begg's tests as well as visual analysis of a funnel plot,and heterogeneity will be evaluated using the Cochran Q test,P values,and I2 ***-analysis,subgroup analysis,and sensitivity analysis will be performed using RevMan software version *** protocol was developed in accordance with the Preferred Reporting Items for systematic Reviews and Meta-Analyses(PRIsMA)Protocols statement,and the PRIsMA statement will be used for the systematic *** This study provides reliable information regarding the safety and efficacy of using butorphanol as an epidural analgesic during *** To support clinical practice and development,this study provides evidence-based findings regarding the safety and efficacy of using butorphanol as an epidural analgesic during labor.

关键词： Epidural analgesia during labor Butorphanol safety Protocol Meta-analysis

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