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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

Recent Advances in C-F Bond Formation from Carbon-Centered Radicals

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Chinese Journal of Chemistry 2024年第9期42卷 1009-1031页

作者： Jihua Zhang Juanjuan Wang Qiang cheng College of Chemistry and Molecular Sciences Wuhan UniversityWuhanHubei 430072China

Construction of C-F bonds is a direct and efficient method for introducing fluorine into pharmaceuticals,agrochemicals,and *** such as nucleophilic,electrophilic,radical,and transition-metal catalyzed fluorination have been developed to meet the demand of diverse C-F bond *** them,radical fluorination has been witnessed with substantial advancement in a recent ***,we reviewed methods for formation of C-F bonds with carbon-centered radicals as key intermediates,especially in recent five *** introduce in the paper with different fluorinating reagents,strategies for radical generation,and application in late-stage functionalization and synthesis of PET *** also indicate the current limitations and propose the direction of the field for the future development.

关键词： Fluorine Fluorinating reagents Late-stage fluorination [^(18)F]jfluorination Radical reactions Synthetic methods

基于自主式项目驱动的逆向工程技术教学改革与实践

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实验技术与管理 2016年第1期33卷 179-182页

作者：杨雪荣成思源郭钟宁广东工业大学机电工程学院广东广州510006

在常规项目式教学的基础上,针对逆向工程技术课程特点开展基于自主式项目驱动的教学方法改革及探索。根据教学内容,开发了多种类型及可自由组合式的综合实践项目。从项目对象的选取、方案制定、具体实施及项目的汇报、总结都由学生自主... 详细信息

在常规项目式教学的基础上,针对逆向工程技术课程特点开展基于自主式项目驱动的教学方法改革及探索。根据教学内容,开发了多种类型及可自由组合式的综合实践项目。从项目对象的选取、方案制定、具体实施及项目的汇报、总结都由学生自主完成,从真正意义上实现了以学生为主体的教学模式,能够有效地培养学生的自主学习、工程实践及创新能力。

关键词：项目驱动逆向工程教学改革创新能力

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面向创新设计的逆向工程技术研究

机床与液压 2015年第19期43卷 25-28页

作者：周小东成思源杨雪荣广东工业大学机电工程学院广东广州510006 广东省创新方法与决策管理系统重点实验室广东广州510006

产品的创新设计已经发展成为企业的核心竞争力,而逆向工程技术是实现创新设计的重要工具。本文首先对基于正逆向软件相结合的及混合建模的逆向工程再设计方法进行了研究,并在此基础上将逆向工程再设计与仿真优化、快速成型相结合,提出... 详细信息

产品的创新设计已经发展成为企业的核心竞争力,而逆向工程技术是实现创新设计的重要工具。本文首先对基于正逆向软件相结合的及混合建模的逆向工程再设计方法进行了研究,并在此基础上将逆向工程再设计与仿真优化、快速成型相结合,提出了面向创新设计的逆向工程工程流程,并给出了实例,为产品创新设计提供了新的途径。

关键词：创新设计逆向工程优化仿真快速成型

Exponential Synchronization of Delayed Stochastic Complex Dynamical Networks via Hybrid Impulsive Control

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IEEE/CAA Journal of Automatica Sinica 2024年第3期11卷 785-787页

作者： Yao Cui Pei cheng Xiaohua Ge the School of Mathematic Science Anhui UniversityHefei 230601China IEEE the School of Science Computing and Engineering TechnologiesSwinburne University of TechnologyMelbourne VIC 3122Australia

Dear Editor,This letter addresses the synchronization problem of a class of delayed stochastic complex dynamical networks consisting of multiple drive and response *** aim is to achieve mean square exponential synchronization for the drive-response nodes despite the simultaneous presence of time delays and stochastic noises in node dynamics.

关键词： dynamics stochastic letter

Robust and Discriminative Feature Learning via Mutual Information Maximization for Object Detection in Aerial Images

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Computers, Materials & Continua 2024年第9期80卷 4149-4171页

作者： Xu Sun Yinhui Yu Qing cheng School of Communication Engineering Jilin UniversityChangchun130012China

Object detection in unmanned aerial vehicle(UAV)aerial images has become increasingly important in military and civil *** object detection models are not robust enough against interclass similarity and intraclass variability of small objects,and UAV-specific nuisances such as uncontrolledweather *** previous approaches focusing on high-level semantic information,we report the importance of underlying features to improve detection accuracy and robustness fromthe information-theoretic ***,we propose a robust and discriminative feature learning approach through mutual information maximization(RD-MIM),which can be integrated into numerous object detection methods for aerial ***,we present the rank sample mining method to reduce underlying feature differences between the natural image domain and the aerial image ***,we design a momentum contrast learning strategy to make object features similar to the same category and dissimilar to different ***,we construct a transformer-based global attention mechanism to boost object location semantics by leveraging the high interrelation of different receptive *** conduct extensive experiments on the VisDrone and Unmanned Aerial Vehicle Benchmark Object Detection and Tracking(UAVDT)datasets to prove the effectiveness of the proposed *** experimental results show that our approach brings considerable robustness gains to basic detectors and advanced detection methods,achieving relative growth rates of 51.0%and 39.4%in corruption robustness,*** code is available at https://***/cq100/RD-MIM(accessed on 2 August 2024).

关键词： Aerial images object detection mutual information contrast learning attention mechanism

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

Flex Based Interactive Courseware for Teaching “Principles and Applications of Single Chip Microcomputer”

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Flex Based Interactive Courseware for Teaching “Principles ...

Formation of Superthin Galaxies in IllustrisTNG

第三届教学管理与课程建设学术会议

作者： Jianfeng ZHOU 1 , Zhongning GUO 1 , siyuan cheng 1 , Ping SU 1 , Jinping ZHOU 1 1 School of Electromechanical Engineering, Guangdong University of Technology, Guangzhou 510006, China

Multimedia courseware is helpful for modern education. In this paper, virtual simulation is proposed for teaching "Principles and Applications of Single Chip Microcomputer". Flex technology is utilized to perform the interactive functions of the courseware. The characteristics of Flex technology and the main process of establishing the interactive courseware is described, and an example of the Flex based interactive courseware is shown. Flex is powerful for animation and application development, so that any interactive function of teaching can be easily implemented through it.

关键词： courseware interaction virtual simulation Flex

来源： cnki会议评论

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Research in Astronomy and Astrophysics 2024年第7期24卷 235-248页

作者： Jianhong Hu Dandan Xu cheng Li Department of Astronomy Tsinghua UniversityBeijing 100084China

Superthin galaxies are observed to have stellar disks with extremely small minor-to-major axis *** this work,we investigate the formation of superthin galaxies in the TNG100 *** trace the merger history and investigate the evolution of galaxy properties of a selected sample of superthin galaxies and a control sample of galaxies that share the same joint probability distribution in the stellar-mass and color *** making comparisons between the two galaxy samples,we find that present-day superthin galaxies had similar morphologies as the control sample counterparts at higher redshifts,but have developed extended flat“superthin”morphologies since z~*** this latter evolution stage,superthin galaxies undergo an overwhelmingly higher frequency of prograde mergers(with orbit-spin angleθ_(orb)≤40°).Accordingly the spins of their dark matter halos have grown significantly and become noticeably higher than those of their normal disk *** further results in the buildup of their stellar disks at larger distances much beyond the regimes of normal disk *** also discuss the formation scenario of those superthin galaxies that live in larger dark matter halos as satellite galaxies therein.

关键词： Galaxies formation-Galaxies evolution-Galaxies interactions-Galaxies star formation