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Synergistic effect of Pd single atoms and clusters on the de/re-hydrogenation performance of MgH_(2)

Journal of Materials science & Technology 2024年第24期191卷 49-62页

作者： Nuo Xu Haoran Zhou Mingqiang Zhang Yuchuan Ye Kaiwen Wang Yingtang Zhou Yunfeng Zhu Yao Zhang School of Materials Science and Engineering Jiangsu Key Laboratory of Advanced Metallic MaterialsSoutheast UniversityNanjing 211189China Zhejiang Key Laboratory of Petrochemical Environmental Pollution Control National Engineering Research Center for Marine AquacultureMarine Science and Technology CollegeZhejiang Ocean UniversityZhoushan 316004China ICFO-Institut de Ciències Fotòniques The Barcelona Institute of Science and TechnologyCastelldefels(Barcelona)08860Spain Faculty of Materials and Manufacturing Beijing University of TechnologyBeijing 100124China College of Materials Science and Engineering Jiangsu Collaborative Innovation Centre for Advanced InorganicFunction CompositesNanjing Tech UniversityNanjing 211816China

Hydrogen storage plays a pivotal role in the hydrogen industry,yet its current status presents a *** strategies have emerged in recent years to address this ***_(2) has stood out as a promising solid-state hydrogen storage material due to its impressive gravimetric and volumetric hydrogen density,but its practical application is hampered by elevated thermal stability and sluggish *** this study,we introduce a solution by synthesizing Pd metallene through a one-pot solvothermal method,revealing a distinctive highly curved lamellar structure with a thickness of around 1.6 *** this Pd metallene into MgH_(2) results in a composite system wherein the starting dehydrogenation temperature is significantly lowered to 439 K and complete dehydrogenation occurs at 583 K,releasing 6.14 wt.%*** activation energy of dehydrogenation for MgH_(2) was reduced from 170.4 kJ mol^(-1) to 79.85 kJ mol^(-1) after Pd metallene *** enthalpy of dehydrogenation of the MgH_(2)-10 wt.%Pd sample was calculated to be 73 kJ mol^(-1) H_(2)^(-1) and decreased by 4.4 kJ mol^(-1) H_(2)^(-1) from that of dehydrogenation of pure MgH_(2)(77.4 kJ mol^(-1) H_(2)-1).Theoretical calculations show that the average formation energy and average adsorption energy of hydrogen vacancies can be significantly reduced in the presence of both Pd clusters and Pd single atoms on the surface of MgH_(2)/Mg,*** suggests that the synergistic effect of in situ formed Pd single atoms and clusters significantly improves the hydrogenation and dehydrogenation *** identified active sites in this study hold potential as references for forthcoming multi-sized active site catalysts,underscoring a significant advancement toward resolving hydrogen storage limitations.

关键词： MgH_(2) Metallene Single atoms Clusters Hydrogen storage

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Groundwater chromate removal by autotrophic sulfur disproportionation

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Environmental science and Ecotechnology 2024年第5期21卷 187-196页

作者： Yan-Ying Qiu Juntao Xia Jiahua Guo Xianzhe Gong Liang Zhang Feng Jiang Guangdong Provincial Key Lab of Environmental Pollution Control and Remediation Technology School of Environmental Science and EngineeringSun Yat-sen UniversityGuangzhou510275China Guangdong Provincial International Joint Research Center on Urban Water Management and Treatment Sun Yat-sen UniversityGuangzhouChina Institute of Marine Science and Technology Shandong UniversityQingdaoShandong266237China

Chromate[Cr(VI)]contamination in groundwater is a global environmental *** elemental sulfur-based biotechnologies for Cr(VI)removal depend heavily on the synthesis of dissolved organic carbon to fuel heterotrophic Cr(VI)reduction,a bottleneck in the remediation *** we show an alternative approach by leveraging sulfur-disproportionating bacteria(SDB)inherent to groundwater ecosystems,offering a novel and efficient Cr(VI)removal *** implemented SDB within a sulfur-packed bed reactor for treating Cr(VI)-contaminated groundwater,achieving a notable removal rate of 6.19 mg L^(-1) h^(-1) under oligotrophic *** identified the chemical reduction of Cr(VI)via sulfide,produced through sulfur disproportionation,as a key mechanism,alongside microbial Cr(VI)reduction within the sulfur-based ***-centric metagenomic analysis revealed a symbiotic relationship among SDB,sulfur-oxidizing,and chromate-reducing bacteria within the reactor,suggesting that Cr(VI)detoxification by these microbial communities enhances the sulfurdisproportionation *** research highlights the significance of sulfur disproportionation in the cryptic sulfur cycle in Cr(VI)-contaminated groundwater and proposes its practical application in groundwater remediation efforts.

关键词： Groundwater remediation Sulfide generation Sulfur-disproportionating bacteria Cr(VI)reduction Symbiotic interactions

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H-STEP: Heuristic Stable Edge Service Entity Placement for Mobile Virtual Reality Systems

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IEEE Transactions on Mobile Computing 2025年

作者： Chi, Xuejian Chen, Honglong Ni, Zhichen Sun, Haiyang Sun, Peng Yu, Dongxiao Shandong Provincial Engineering Research Center of Intelligent Sensing and Measurement and Control Technology College of Control Science and Engineering Qingdao266580 China Hunan University College of Computer Science and Electronic Engineering Changsha410082 China Shandong University School of Computer Science and Technology Qingdao266237 China

Virtual reality (VR) technology, as a latency-sensitive application, can achieve real-time response to enhance the user's quality of experience (QoE) on edge devices. However, edge servers, unlike internally managed cloud servers, are prone to hardware failures, software abnormalities, and network attacks. Most prior studies have focused on reducing service delay and improving user coverage through service entity (SE) placement, often neglecting the critical impact of edge server malfunctions on user QoE. In this work, we design a stable service entity placement framework that connects users on faulty servers to collaborative edge servers, ensuring seamless task completion. This framework presents two primary challenges: determining the grouping of collaborative edge services and the placement of SEs. To address these challenges, we introduce a heuristic stable service entity placement (H-STEP) scheme. This scheme first determines the grouping of collaborative edge servers using an iterative search algorithm and then places SEs on suitable edge servers via a fast non-dominated sorting genetic placement algorithm. This approach balances stability benefits with total cost, enhancing the system's economic benefits. We theoretically analyze the performance of H-STEP and derive the performance gap between H-STEP and the optimal scheme. Extensive real-data-driven simulations demonstrate that H-STEP's performance closely approximates that of the optimal scheme and surpasses existing schemes. © 2002-2012 IEEE.

关键词： Virtual environments

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Modeling and analysis of the influence of air gap structure size on the churning loss in wet-type permanent magnet synchronous motors

Modeling and analysis of the influence of air gap structure ...

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2024 CSAA/IET International Conference on Aircraft Utility Systems, AUS 2024

作者： Cheng, Yunkai Li, Shuanglu Lin, Jionghui Liu, Zhicheng Jiang, Chaofan Zhang, Xinbin Yu, Tian Tianmushan Laboratory Hangzhou China Shanghai Aerospace Control Technology Research Institute Shanghai China Science and Technology on Aircraft Control Laboratory Beihang University Beijing China School of Automation Science and Electrical Engineering Beihang University Beijing China Ningbo Institute of Technology Beihang University Ningbo China

Wet-type permanent magnet synchronous motors (WTPMSM) are extensively utilized to meet the power density requirements of electro-hydrostatic actuators (EHA), which are widely used in modern aircraft control systems. These motors are valued for their superior thermal performance and compact design. However, WTPMSM face a key challenge in the form of oil churning loss, especially within narrow air gaps. This churning loss can significantly impact the motor's performance and efficiency. In this paper, an analytical model has been established and computational fluid dynamics (CFD) has been employed to simulate the internal flow of the motor, thereby predicting the churning loss. The paper also investigates churning loss caused by the thread air gap in the wet motor, examining the effects of thread geometry, size, and motor speed on churning loss. Strategies such as optimizing thread design and adjusting operational parameters are proposed to mitigate churning losses. In summary, churning loss of WTPMSM is significantly influenced by the thickness of the air gap and the depth of the threads. These findings provide guidance for the design of electric motors. Future research should delve deeper into the specific impacts of various design parameters on churning losses and explore methods to reduce churning losses through enhanced motor design. © The Institution of engineering & Technology 2024.

关键词： Computational fluid dynamics

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Transfer Learning Based Multi-Perception Safety Strategy for Human-Robot Collaboration

Transfer Learning Based Multi-Perception Safety Strategy for...

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2023 IEEE International Conference on Real-Time Computing and Robotics, RCAR 2023

作者： Wei, Chongyi Wang, Changcong Bai, Shaoping Li, Yibin Tian, Xincheng Zhou, Lelai Shandong University Center for Robotics School of Control Science and Engineering Jinan250061 China Ministry of Education Engineering Research Center of Intelligent Unmanned System Jinan250061 China Aalborg University Department of Materials and Production Aalborg9220 Denmark

ISBN: (纸本)9798350327182

Human-robot collaboration (HRC) is vital to adapt to the significant change in manufacturers' demands for automation, and safety is a primary and major challenge that must be addressed for it. In this paper, a muti-perception safety strategy and framework are introduced to ensure human safety while trying to avoid reducing the work efficiency of the robot by taking human activity intentions and human-robot distance into account. To realize the safety strategy, an LSTM-CNN based neural network is built for human activity classification. To improve the generalization ability and performance of the network with data scarcity for existing deep learning-based human activity recognition methods, transfer learning-enabled activity recognition is proposed. Based on the studies, a feasible security system is implemented in the human-robot collaboration scenario. © 2023 IEEE.

关键词： Long short-term memory

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Predicting the elemental compositions of solid waste using ATR-FTIR and machine learning

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Frontiers of Environmental science & engineering 2023年第10期17卷 41-54页

作者： Haoyang Xian Pinjing He Dongying Lan Yaping Qi Ruiheng Wang Fan Lü Hua Zhang Jisheng Long Institute of Waste Treatment&Reclamation College of Environmental Science and EngineeringTongji UniversityShanghai 200092China Shanghai Institute of Pollution Control and Ecological Security Shanghai 200092China Shanghai Engineering Research Center of Multi-source Solid Wastes Co-processing and Energy Utilization Shanghai 200092China Shanghai SUS Environment Co. Ltd.Shanghai 201703China

Elemental composition is a key parameter in solid waste treatment and disposal. This study has proposed a method based on infrared spectroscopy and machine learning algorithms that can rapidly predict the elemental composition (C, H, N, S) of solid waste. Both noise and moisture spectral interference that may occur in practical application are investigated. By comparing two feature selection methods and five machine learning algorithms, the most suitable models are selected. Moreover, the impacts of noise and moisture on the models are discussed, with paper, plastic, textiles, wood, and leather as examples of recyclable waste components. The results show that the combination of the feature selection and K-nearest neighbor (KNN) approaches exhibits the best prediction performance and generalization ability. Particularly, the coefficient of determination (R2) of the validation set, cross validation and test set are higher than 0.93, 0.89, and 0.97 for predicting the C, H, and N contents, respectively. Further, KNN is less sensitive to noise. Under moisture interference, the combination of feature selection and support vector regression or partial least-squares regression shows satisfactory results. Therefore, the elemental compositions of solid waste are quickly and accurately predicted under noise and moisture disturbances using infrared spectroscopy and machine learning algorithms.

关键词： Elemental composition Infrared spectroscopy Machine learning Moisture interference Solid waste Spectral noise

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Lattice Boltzmann Shakhov kinetic models for variable Prandtl number on Cartesian lattices

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Physical Review E 2024年第6期110卷 065304-065304页

作者： Oleg Ilyin Federal Research Center “Computer Science and Control” of the Russian Academy of Sciences Vavilova 44 Moscow 119333 Russia

Two-dimensional lattice Boltzmann (LB) models for the Shakhov kinetic equation are developed. In contrast to several previous thermal LB models with variable Prandtl number, the present approach deals with the models on Cartesian lattices. This allows the standard collide-and-stream implementation. The discrete velocity local equilibrium is evaluated as a projection of the Shakhov local equilibrium on the orthonormal basis spanned by the Hermite polynomials. The local equilibrium distribution explicitly depends on the Prandtl number, and the Shakhov LB models can be established on well-known lattices having 25 and 37 velocities. Next, in order to reproduce the rarefied effects better, a semiautomatic approach for construction of high-order lattices which minimizes the difference between the half moments evaluated from the discrete velocity equilibrium and the Maxwell distribution is proposed. This problem is equivalent to solving a system of linear equations with constraint. Two high-order lattices having 37 velocities are deduced. Several test problems are considered: the thermal wave decay and the thermal Couette flow in the hydrodynamic limit for various Prandtl and Mach numbers, rarefied effects in the athermal Couette and Poiseuille flows, and rarefied effects in the Fourier flow. It is demonstrated that the new models show a good accuracy while considering rarefied flows in slip and transition regimes and some particular problems in the ballistic regime (the Knudsen paradox).

关键词： Prandtl number

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Simultaneous removal of NO and dichloromethane(CH_(2)Cl_(2)) over Nb-loaded cerium nanotubes catalyst

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Journal of Environmental sciences 2022年第1期34卷 175-184页

作者： Weilong Ouyang Yi Zhou Xiaoqi Fei Yarong Bai Haiqiang Wang Zhongbiao Wu Key Laboratory of Environment Remediation and Ecological Health Ministry of EducationCollege of Environmental and Resources ScienceZhejiang UniversityHangzhou 310058China Zhejiang Provincial Engineering Research Center of Industrial Boiler and Furnace Flue Gas Pollution Control Hangzhou 310058China

Herein,a series of niobium oxide supported cerium nanotubes(Ce NTs)catalysts with different loading amount of Nb_(2)O_(5)(0–10 wt.%)were prepared and used for selective catalytic reduction of NOxwith NH_(3)(NH_(3)-SCR)in the presence of CH_(2)Cl_(2).Commercial V_(2)O_(5)-WO_(3)-TiO_(2) catalyst was also prepared for *** physcial properties and chemical properties of the Nb_(2)O_(5) loaded cerium nanotubes catalysts were investigated by X-ray diffractometer,Transmission electron microscope,Brunauer-Emmett-Teller specific surface area,H_(2)-temperature programmed reduction,NH_(3)-temperature programmed desorption and Xray photoelectron *** experiment results showed that the loading amount of Nb_(2)O_(5) had a significant effect on the catalytic performance of the catalysts.10 wt.%Nb-Ce NTs catalyst presented the best NH_(3)-SCR performance and degradation efficiency of CH_(2)Cl_(2) among the prepared catalysts,due to its superior redox capability,abundant surface oxygen species and acid sites,the interaction between Nb and Ce,higher ratio of Nb^(4+)/(Nb^(5+)+Nb^(4+))and Ce^(3+)/(Ce^(3+)+Ce^(4+)),as well as the special tubular structure of cerium *** study may provide a practical approach for the design and synthesis of SCR catalysts for the simultaneously removal NOxand chlorinated volatile organic compounds(CVOCs)emitted from the stationary industrial sources.

关键词： Cerium nanotubes Niobium oxide Selective catalytic reduction Nitrogen oxides CH_(2)Cl_(2) Simultaneous removal

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Distributed finite-time event-triggered formation control based on a unified framework of affine image

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IEEE/CAA Journal of Automatica Sinica 2024年第6期12卷 1-3页

作者： Lin, Yan-Jun Yang, Yun-Shi Chai, Li Lin, Zhi-Yun Hangzhou Applied Acoustics Research Institute Hangzhou 310027 China College of Control Science and Engineering Zhejiang University Hangzhou 310027 China School of System Design and Intelligent Manufacturing Southern University of Science and Technology Shenzhen 518055 and also with Peng Cheng Laboratory Shenzhen 518000 China

Dear Editor, This letter concentrates on distributed event-triggered formation control problems with finite-time convergence in an arbitrarily dimensional Euclidean space. A new unified approach of finite-time event-triggered formation control is proposed by steering all agents to a sliding manifold (the affine image) to achieve general formations, like affine, rigid or translational formation. It only requires to design an extra steering law driving at least d +1 leaders from an affine image to a rigid or translational image, where d is the dimension of the space. The event-triggered function is designed in a distributed and discontinuous manner based only on local information to reduce the communication and calculation resources by aperiodic sampling. In the proposed event-triggered formation law, zeno-free behavior is ensured. IEEE

关键词： Sliding mode control

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HCRI: A ROS2 Human Collision Object Interface for Robotic Manipulation Planning

HCRI: A ROS2 Human Collision Object Interface for Robotic Ma...

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2023 IEEE International Conference on Real-Time Computing and Robotics, RCAR 2023

作者： Wang, Changcong Wei, Chongyi Bai, Shaoping Li, Yibin Tian, Xincheng Zhou, Lelai Shandong University The Center for Robotics School of Control Science and Engineering Jinan250061 China The Engineering Research Center of Intelligent Unmanned System Ministry of Education Jinan250061 China Aalborg University Department of Materials and Production Aalborg9220 Denmark

ISBN: (纸本)9798350327182

Human-Robot Collaboration (HRC) is people and robots work together in the same workspace to achieve shared goals. To ensure safety, robots need to perceive the position of the human body for planning purposes. However, there is no universal method for converting the human body into collision objects. To solve this problem, we propose an interface to convert the human body segments into collision objects in the robot planning scene. The interface estimates the human body Skinned Multi-Person Linear model (SMPL) by RGB image and measures the collision object size of the corresponding body segment. The corresponding size of collision objects are added to the corresponding positions of the human pose estimated by different types of sensors. The accuracy of human size estimation is verified on TotalMocap of AMASS. The interface with OctoMap is compared to evaluate the efficiency and the validity on interface is verified on the robot UR5e. © 2023 IEEE.

关键词： Image segmentation

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