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MXenes/CNTs-based hybrids:Fabrications,mechanisms,and modification strategies for energy and environmental applications

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Nano research 2024年第5期17卷 3429-3454页

作者： Jizhou Jiang Fangyi Li Lei Ding Chengxun Zhang Arramel Xin Li School of Environmental Ecology and Biological Engineering School of Chemistry and Environmental EngineeringKey Laboratory of Green Chemical Engineering Process of Ministry of EducationEngineering Research Center of Phosphorus Resources Development and Utilization of Ministry of EducationNovel Catalytic Materials of Hubei Engineering Research CenterWuhan Institute of TechnologyWuhan 430205China Nano Center Indonesia Jl.PUSPIPTEK Tangerang SelatanBanten 15314Indonesia Institute of Biomass Engineering Key Laboratory of Energy Plants Resource and UtilizationMinistry of Agriculture and Rural AffairsSouth China Agricultural UniversityGuangzhou 510642China

Emerging two-dimensional(2D)layered metal carbide and nitride materials,commonly termed MXenes,are increasingly recognized for their applications across diverse fields such as energy,environment,and *** the past few years,MXenes/carbon nanotubes(CNTs)-based hybrids have attracted extensive attention as an important catalyst in energy and environmental fields,due to their superior multifunctions and mechanical *** review aims to address the fabrication strategies,the identification of the enhancement mechanisms,and recent progress regarding the design and modification of MXenes/CNTs-based hybrids.A myriad of fabrication techniques have been systematically summarized,including mechanical mixing,spray drying,three-dimensional(3D)printing,self-assembly/in-situ growth,freeze drying,templating,hydrothermal methods,chemical vapor deposition(CVD),and ***,the identification of the enhancement mechanisms was thoroughly discussed from the two dimensions of theoretical simulations and in-situ ***,the recent advancements in profound applications of MXenes/CNTs-based hybrids have also been carefully revealed,including energy storage devices,sensors,water purification systems,and microwave *** also underscore anticipated challenges related to their fabrication,structure,underlying mechanisms,modification approaches,and emergent ***,this review offers insights into prospective directions and the future trajectory for these promising *** is expected that this review can inspire new ideas or provide new research methods for future studies.

关键词： MXenes/carbon nanotubes(CNTs)-based hybrids fabrication applications modification strategies

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Distributed Constrained Optimization with Uncoordinated Step Sizes: A Case Study on Ethylene Plant

Distributed Constrained Optimization with Uncoordinated Step...

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2024 China Automation Congress, CAC 2024

作者： Liu, Bing Li, Zhongmei Du, Wenli School of Information Science and Engineering East China University of Science and Technology Shanghai China Engineering Research Center of Process System Engineering Ministry of Education East China University of Science and Technology Shanghai China

ISBN: (纸本)9798350368604

This paper investigates an uncoordinated step sizes distributed optimization algorithm based on an undirected topology network structure, which can handle distributed optimization problems with inequality constraints and heterogeneity (losing the global clock) by only communicating with neighboring nodes. Firstly, an "Adapt-Then-Combine Distributed Inexact Gradient tracking subject to Inequality Constraints (ATC-DIGing-IC)" algorithm is proposed for μ-strongly convex and l-smooth objective functions. Using the "Adapt-Then-Combine (ATC)" framework and the gradient information tracking structure, the flexibility and fastness of the algorithm can be guaranteed under the uncoordinated step size. Then, a parameter projection technique is introduced to handle the inequality constraints without introducing additional auxiliary variables. Subsequently, the convergence results of the algorithm and the bounds on the uncoordinated step sizes are theoretically analyzed. Finally, the algorithm is applied to a plant-wide separation production process of an ethylene plant, and the experimental results show that the proposed algorithm requires a shorter optimization time than the existing methods. © 2024 IEEE.

关键词： Constrained optimization

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Integrated Active Suspension and Anti-Lock Braking Control for Four-Wheel-Independent-Drive Electric Vehicles

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Chinese Journal of Mechanical engineering 2024年第1期37卷 87-98页

作者： Ze Zhao Lei Zhang Xiaoling Ding Zhiqiang Zhang Shaohua Li Liang Gu National Engineering Research Center for Electric Vehicles Beijing Institute of TechnologyBeijing 100081China State Key Laboratory of Mechanical Behavior and System Safety of Traffic Engineering Structures Shijiazhuang Tiedao UniversityShijiazhuang 050043China

This paper presents an integrated control scheme for enhancing the ride comfort and handling performance of a four-wheel-independent-drive electric vehicle through the coordination of active suspension system(ASS)and anti-lock braking system(ABS).First,a longitudinal-vertical coupled vehicle dynamics model is established by integrating a road input *** the coupling mechanisms between longitudinal and vertical vehicle dynamics are *** ASS-ABS integrated control system is proposed,utilizing an H∞controller for ASS to optimize load transfer effect and a neural network sliding mode control for ABS ***,the effectiveness of the proposed control scheme is evaluated through comprehensive tests conducted on a hardware-in-loop(HIL)test *** HIL test results demonstrate that the proposed control scheme can significantly improve the braking performance and ride comfort compared to conventional ABS control methods.

关键词： Four-wheel-independent-drive electric vehicles Active suspension system(ASS) Anti-lock braking system(ABS) Vertical-longitudinal vehicle dynamics

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Topology Optimization of Transient Thermo-elastic Structure Considering Regional Temperature Control

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Acta Mechanica Solida Sinica 2023年第2期36卷 262-273页

作者： Jianliang Chen Qinghai Zhao Liang Zhang Kaiyu Ma College of Mechanical and Electrical Engineering Qingdao UniversityQingdao 266071China National Engineering Research Center for Intelligent Electrical Vehicle Power System Qingdao UniversityQingdao 266071China

In this paper,a topology optimization model for transient thermo-elastic coupling problems is *** on the method of solid isotropic material with penalization,the coupled equations of transient thermomechanical field are *** this model,the objective is to minimize the global structural compliance with volume and maximum temperature constraints during the working *** efficiently restrict the maximum temperature of the transient thermo-elastic structure in time and spatial dimensions,the regional temperature control scheme is constructed using the aggregation *** adjoint variable method is adopted to derive the sensitivity of objective function and constraints,and the design variables are updated through the method of moving asymptotes to obtain clear optimal *** effects of the duration and magnitude of the thermal and structural loads on the optimization results are discussed through several numerical examples.

关键词： Topology optimization Transient thermo-elastic problems Temperature constraints Aggregation function

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A Composite Decomposition Method for Large-Scale Global Optimization

IEEE Transactions on Artificial Intelligence

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IEEE Transactions on Artificial Intelligence 2024年第12期5卷 6304-6319页

作者： Tian, Maojiang Chen, Minyang Du, Wei Tang, Yang Jin, Yaochu Yen, Gary G. Southern University of Science and Technology Department of Computer Science and Engineering Shenzhen518055 China East China University of Science and Technology Key Laboratory of Smart Manufacturing in Energy Chemical Process Ministry of Education Shanghai200237 China East China University of Science and Technology Engineering Research Center of Process System Engineering Ministry of Education Shanghai200237 China Westlake University School of Engineering Hangzhou310030 China Oklahoma State University School of Electrical and Computer Engineering StillwaterOK74048 United States

Cooperative coevolution (CC) algorithms, based on the divide-and-conquer strategy, have emerged as the predominant approach to solving large-scale global optimization (LSGO) problems. The efficiency and accuracy of the grouping stage significantly impact the performance of the optimization process. While the general separability grouping (GSG) method has overcome the limitation of previous differential grouping (DG) methods by enabling the decomposition of nonadditively separable functions, it suffers from high computational complexity. To address this challenge, this article proposes a composite separability grouping (CSG) method, seamlessly integrating DG and GSG into a problem decomposition framework to utilize the strengths of both approaches. CSG introduces a step-by-step decomposition framework that accurately decomposes various problem types using fewer computational resources. By sequentially identifying additively, multiplicatively and generally separable variables, CSG progressively groups nonseparable variables by recursively considering the interactions between each nonseparable variable and the formed nonseparable groups. Furthermore, to enhance the efficiency and accuracy of CSG, we introduce two innovative methods: a multiplicatively separable variable detection method and a nonseparable variable grouping method. These two methods are designed to effectively detect multiplicatively separable variables and efficiently group nonseparable variables, respectively. Extensive experimental results demonstrate that CSG achieves more accurate variable grouping with lower computational complexity compared to GSG and state-of-the-art DG-series designs. © 2024 IEEE.

关键词： Computational efficiency

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Noncovalent interactions on the electrocatalytic oxidation of ethanol on a Pt/C electrocatalyst

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Carbon Energy 2023年第9期5卷 113-123页

作者： Chenjie Han Yeqing Lyu Shaona Wang Biao Liu Yi Zhang Jun Lu Hao Du National Engineering Research Center of Green Recycling for Strategic Metal Resources Institute of Process EngineeringChinese Academy of SciencesBeijingChina School of Chemical Engineering University of Chinese Academy of SciencesBeijingChina College of Chemical and Biological Engineering Zhejiang UniversityHangzhouChina

Due to their environmentally friendly nature and high energy density,direct ethanol fuel cells have attracted extensive research attention in recent ***,the actual Faraday efficiency of the ethanol oxidation reaction(EOR)is much lower than its theoretical value and the reaction kinetics of the EOR is sluggish due to insufficient active sites on the electrocatalyst ***/C is recognized as one of the most promising electrocatalysts for the ***,the microscopic interfacial reaction mechanisms of the EOR on Pt/C were systematically studied in this *** metal hydroxide solutions,hydrated alkali cations were found to bind with OH_(ad)through noncovalent interactions to form clusters and occupy the active sites on the Pt/C electrocatalyst surface,thus resulting in low Faraday efficiency and sluggish kinetics of the *** reduce the negative effect of the noncovalent interactions on the EOR,a shield was made on the electrocatalyst surface using 4-trifluoromethylphenyl,resulting in twice the EOR catalytic reactivity of Pt/C.

关键词： ethanol electro‐oxidation Faraday efficiency kinetics modification of electrocatalyst noncovalent interactions

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Perspectives on China’s Manned Lunar Scientific research and Test Station

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Advances in Astronautics Science and Technology 2024年第1期7卷 51-64页

作者： Peng, Qibo Wang, Ping Xing, Lei China Astronauts Research and Training Center Beijing100094 China Beijing Institute of Spacecraft System Engineering Beijing100094 China

China's lunar exploration efforts have been focused on developments in space that are sustainable. To this end, the country plans to construct a manned lunar scientific research station after successfully landing on the Moon, with the aim of ensuring long-term human survival on the lunar surface and developing and utilizing lunar resources. To achieve this goal, extensive research has been conducted on the development plans and current situation of manned lunar exploration. Based on the development law of human deep-space exploration, a goal of verifying human long-term, extraterrestrial survival technology and addressing challenges, while carrying out in-depth scientific research on the Moon and exploring its resources, is proposed. After analyzing the difficulties and development trends of the station's construction, possible incremental development plans and paths for the future are discussed. Considering the four major elements of strategy, science, engineering, and economics, and focusing on the safety requirements of manned spaceflight, a preliminary idea for selecting the station location is proposed. Finally, six key technologies and challenges are analyzed with the development plan. Overall, China's commitment to lunar exploration reflects its dedication to advancing scientific knowledge and technological capabilities, while also contributing to the long-term sustainability of human presence in space. © Chinese Society of Astronautics 2024. corrected publication 2024.

关键词： Site selection

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Cognitive impairment in cerebral small vessel disease induced by hypertension

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Neural Regeneration research 2024年第7期19卷 1454-1462页

作者： Weipeng Wei Denglei Ma Lin Li Lan Zhang Department of Pharmacy Xuanwu Hospital of Capital Medical UniversityBeijingChina Beijing Geriatric Medical Research Center Beijing Engineering Research Center for Nervous System DrugsNational Center for Neurological DisordersNational Clinical Research Center for Geriatric DiseasesBeijingChina

Hypertension is a primary risk factor for the progression of cognitive impairment caused by cerebral small vessel disease,the most common cerebrovascular *** r,the causal relationship between hypertension and cerebral small vessel disease remains *** has substantial negative impacts on brain health and is recognized as a risk factor for cerebrovascular *** hypertension and lifestyle factors are associated with risks for stro ke and dementia,and cerebral small vessel disease can cause dementia and *** is the main driver of cerebral small vessel disease,which changes the structure and function of cerebral vessels via various mechanisms and leads to lacunar infarction,leukoaraiosis,white matter lesions,and intracerebral hemorrhage,ultimately res ulting in cognitive decline and demonstrating that the brain is the to rget organ of *** review updates our understanding of the pathogenesis of hypertensioninduced cerebral small vessel disease and the res ulting changes in brain structure and function and declines in cognitive *** also discuss drugs to treat cerebral small vessel disease and cognitive impairment.

关键词： blood-brain barrier cerebral small vessel disease cognitive impairment dementia endothelial dysfunction enlarged perivascular space hypertension lacunar infarction neuroinflammation treatment white matter high signal intensity

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Comprehensive Volume Modeling and Optimization of Switched Tank Modular Converters 14

Comprehensive Volume Modeling and Optimization of Switched T...

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14th International Conference on Power, Energy and Electrical engineering, CPEEE 2024

作者： Li, Haihan Wang, Dong Qian, Qinsong National Asic System Engineering Research Center Southeast University China

ISBN: (纸本)9781643685199

As a result of the increasing number of electronic devices and limited space on aircraft, the development of high-efficiency and small-sized power supply systems is necessary. The switched tank modular converter (STM) receives attention recently because of its high power density and efficiency, which is suitable for aircraft application. Full soft charging is achieved by connecting a small inductor in series with the flying capacitor compared to the traditional switched capacitor (SC). Zero current switching (ZCS) helps to reducing the power loss of the switches. However, further reduction of the overall size is hampered by the fact that the effect of switches and passive components on the total volume is unclear. In order to find the optimum total volume of the STM, a comprehensive volume modeling and optimization method is proposed in this paper based on the semiconductor power loss and resonant capacitor voltage ripple analysis. A 12V-6V, 10W, 3.85MHz STM prototype is fabricated to verify the proposed optimization method, which achieves 96% peak efficiency at rated power and 51.25 mm3 total volume. Three groups of switches and passive components collocation are designed and the optimum volume group is found while remaining the highest efficiency. © 2024 The Authors.

关键词： Efficiency

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Precise control of page cache for containers

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Frontiers of Computer Science 2024年第2期18卷 17-30页

作者： Kun WANG Song WU Shengbang LI Zhuo HUANG Hao FAN Chen YU Hai JIN National Engineering Research Center for Big Data Technology and System Services Computing Technology and System LabCluster and Grid Computing Lab School of Computer Science and TechnologyHuazhong University of Science and TechnologyWuhan 430074China

Container-based virtualization isbecoming increasingly popular in cloud computing due to its efficiency and *** isolation is a fundamental property of *** works have indicated weak resource isolation could cause significant performance degradation for containerized applications and enhanced resource ***,current studies have almost not discussed the isolation problems of page cache which is a key resource for *** leverage memory cgroup to control page cache ***,existing policy introduces two major problems in a container-based ***,containers can utilize more memory than limited by their cgroup,effectively breaking memory ***,the Os kernel has to evict page cache to make space for newly-arrived memory requests,slowing down containerized *** paper performs an empirical study of these problems and demonstrates the performance impacts on containerized *** we propose pCache(precise control of page cache)to address the problems by dividing page cache into private and shared and controlling both kinds of page cache separately and *** do so,pCache leverages two new technologies:fair account(f-account)and evict on demand(EoD).F-account splits the shared page cache charging based on per-container share to prevent containers from using memory for free,enhancing memory *** EoD reduces unnecessary page cache evictions to avoid the performance *** evaluation results demonstrate that our system can effectively enhance memory isolation for containers and achieve substantial performance improvement over the original page cache management policy.

关键词： page cache memory cgroup container isolation cloud computing

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