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Quasicrystal metasurface for optical holography and diffraction

Light(Science & Applications) 2024年第11期13卷 2419-2420页

作者： Xin Wen Zixian Hu Heng Wang Yu Chen Qichang Ma Guixin Li Department of Materials Science and Engineering Southern University of Science and TechnologyShenzhenChina Institute for Applied Optics and Precision Engineering Southern University of Science and TechnologyShenzhenChina

Quasicrystal metasurfaces,a kind of two-dimensional artificial optical materials with subwavelength meta-atoms arranged in quasi-periodic tiling schemes,have attracted extensive attentions due to their novel optical *** a recent work,a dual-functional quasicrystal metasurface,which can be used to simultaneously generate the diffraction pattern and holographic image,is experimentally *** proposed method expands the manipulation dimensions for multi-functional quasicrystal metasurfaces and may have important applications in microscopy,optical information processing,optical encryption,etc.

关键词： properties crystal dimensions

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Thermal decomposition mechanism and kinetics of bastnaesite in suspension roasting process:A comparative study in N_(2) and air atmospheres

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Journal of rare Earths 2024年第9期42卷 1809-1816,I0006页

作者： Wenbo Li Jijia Chen Shaokai Cheng Junyan Sun Xiaolong Zhang School of Resources and Civil Engineering Northeastern UniversityShenyang110819China National-Local Joint Engineering Research Center of High-Efficient Exploitation Technology for Refractory Iron Ore Resources Shenyang110819China

To investigate the thermal decomposition behavior and reaction kinetics of bastnaesite in suspension roasting,the gas and solid products of bastnaesite roasted in N2 and air atmospheres were examined using a gas analyzer,X-ray diffraction(Xrd),scanning electron microscopy(SEM),and energy dispersive spectrometry(EdS).Subsequently,the kinetic parameters of bastnaesite in the suspension roasting process were derived and calculated using the isothermal *** results show that the decomposition product of bastnaesite in N_(2) is ***,once the roasting temperature exceeds 600℃,CO is generated in addition to CO_(2),and all the Xrd diffraction peaks of CeOF are shifted to the right,indicating that CO_(2) can oxidize CeOF and lead to the transformation of Ce(Ⅲ) into Ce(Ⅳ).When roasted in air,the decomposition product CeOF can be completely converted to CeF3 and Ce_(7)O_(12) as it easily ***,the reaction rate of bastnaesite in air is higher than that of N_(2),and the starting reaction temperature is lower than that of N_(2).A large number of irregular cracks and holes appear on the surface of solid-phase products following suspension roasting,which are due to the thermal decomposition of bastnaesite that produces CO_(2) as well as the reconstruction of the lattice of the solid-phase *** reaction kinetic model of bastnaesite roasted in N_(2)(temperature range 600-750℃) and air(temperatu re range 500-575℃) confo rms to the A_(3/2) model with the mechanism function G(α)=-ln(1-α)^(2/3),and the reaction activation energy is 59.78 kj/mol and lnA is 1.65 s^(-1) in N_(2) *** air,the reaction activation energy is 100.30 kj/mol and lnA is 9.63 s^(-1).

关键词： rare earths Bastnaesite Suspension roasting Thermal decomposition mechanism reaction kinetics

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Framework and key technologies of Human-machine Hybrid-augmented Intelligence System for Large-scale Power Grid dispatching and Control

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CSEE Journal of Power and Energy Systems 2024年第1期10卷 1-12页

作者： Shixiong Fan Jianbo Guo Shicong Ma Lixin Li Guozheng Wang Haotian Xu Jin Yang Zening Zhao China Electric Power Research Institute Beijing 100192China the Beijing Huairou Laboratory Beijing 101400China School of Engineering the University of GlasgowGlasgow G128QQUK

With integration of large-scale renewable energy,new controllable devices,and required reinforcement of power grids,modern power systems have typical characteristics such as uncertainty,vulnerability and openness,which makes operation and control of power grids face severe security *** of artificial intelligence(AI)technologies represented by machine learning in power grid regulation is limited by reliability,interpretability and generalization ability of complex *** of hybrid-augmented intelligence(HAI)based on human-machine collaboration(HMC)is a pivotal direction for future development of AI technology in this *** on characteristics of applications in power grid regulation,this paper discusses system architecture and key technologies of human-machine hybrid-augmented intelligence(HHI)system for large-scale power grid dispatching and control(PGdC).First,theory and application scenarios of HHI are introduced and analyzed;then physical and functional architectures of HHI system and human-machine collaborative regulation process are *** technologies are discussed to achieve a thorough integration of human/machine ***,state-of-theart and future development of HHI in power grid regulation are summarized,aiming to efficiently improve the intelligent level of power grid regulation in a human-machine interactive and collaborative way.

关键词： Artificial intelligence human-machine collaborative control human-machine hy brid intelligence optimization and evolution power grid dispatching and control

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Quantized decoders that Maximize Mutual Information for Polar Codes

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China Communications 2024年第7期21卷 125-134页

作者： Zhu Hongfei Cao Zhiwei Zhao Yuping Li dou School of Electronics Engineering and Computer Science Peking UniversityBeijing 100871China

In this paper,we innovatively associate the mutual information with the frame error rate(FEr)performance and propose novel quantized decoders for polar *** on the optimal quantizer of binary-input discrete memoryless channels(BdMCs),the proposed decoders quantize the virtual subchannels of polar codes to maximize mutual information(MMI)between source bits and quantized *** nested structure of polar codes ensures that the MMI quantization can be implemented stage by *** results show that the proposed MMI decoders with 4 quantization bits outperform the existing nonuniform quantized decoders that minimize mean-squared error(MMSE)with 4 quantization bits,and yield even better performance than uniform MMI quantized decoders with 5 quantization ***,the proposed 5-bit quantized MMI decoders approach the floating-point decoders with negligible performance loss.

关键词： maximize mutual information polar codes quantization successive cancellation decoding

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Physical Mechanism Enabled Neural Network for Power System dynamic Security Assessment

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CSEE Journal of Power and Energy Systems 2024年第6期10卷 2296-2307页

作者： Guozheng Wang Jianbo Guo Shicong Ma Kui Luo Xi Zhang Qinglai Guo Shixiong Fan Tiezhu Wang Weilin Hou Department of Power System China Electric Power Research InstituteBeijing 100192China School of Automation Beijing Institute of TechnologyBeijing 100081China Department of Electrical Engineering Tsinghua UniversityBeijing 100084China

data-driven artificial intelligence technologies have emerged as increasingly fascinating tools for assessing power system ***,their inherent mechanism of inexplicability and unreliability now limits their scalability in power *** address this problem,this paper proposes a neural network design method empowered by physical mechanisms for power system security *** incorporates geometric characteristics of dynamic security regions into the network training process and constructs connections between network structure and system's unstable mode,which can perform security assessment with a neural network efficiently while ensuring physical ***,a credibility evaluation mechanism is established to ensure credibility of neural network predictions and reduce ***,effectiveness of the proposed method is verified on test *** and considerations in building a neural network with interpretable structures and credible predictions can provide a reference for machine intelligence applied in other industrial systems.

关键词： Credibility index machine intelligence neural network structure physical properties power system security assessment

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Multi-period fourth-party logistics network design from the viability perspective: a collaborative hyper-heuristic embedded with double-layer Q-learning algorithm

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INTErnational JOUrNAL OF PrOdUCTION rESEArCH 2025年第9期63卷 3300-3330页

作者： Zhang, Yuxin Huang, Min Gao, Zheming Jiang, Songchen Fang, Shu-Cherng Wang, Xingwei Northeastern Univ Coll Informat Sci & Engn Shenyang 110819 Liaoning Peoples R China North Carolina State Univ Edward P Fitts Dept Ind & Syst Engn Raleigh NC USA Northeastern Univ Coll Comp Sci & Engn Shenyang Peoples R China

In the 'new normal' setting of a mega-crisis, the viability becomes the driving force for the fourth party logistics (4PL) network design. In this paper, the viability is characterised in terms of agility, resilience and survival sustainability as the response to changes in demand, disruption and survivability. The fortification and recovery strategies are considered in possible disruptions at transfer centres and third-party logistics providers. A novel mixed integer non-linear programming model is proposed to obtain the multi-period 4PL network solution with minimum total cost under viability constraints. Considering the NP-hard characteristic of problem and the non-convex of proposed model, the hyper-heuristic algorithm is designed. To take advantage of both global optimality seeking and local search ability, a collaborative hyper-heuristic embedded with double-layer Q-learning (CHHdLQL) algorithm is proposed. The effectiveness and efficiency of the proposed algorithm is demonstrated by the promising numerical results. By stress-testing the existing network, appropriate adjustments to fortification and recovery strategies can effectively cope with changes in demand and disruption. Furthermore, the impact of 4PL strategy, fortification and recovery strategies, and viability constraints are investigated. The demand satisfaction, network resilience and capacity can be improved by adjusting agility, resilience and survival sustainability to influence different component network *** novel multi-period 4PL network model under viability constraints is *** CHHdLQL algorithm for construction and perturbation coevolution is *** stress tests apply to the 4PL network, including demand, disruption and 3PL.4PL improves demand satisfaction, resilience and capacity by adjusting viability.

关键词： 4PL network design viability collaborative hyper-heuristic double-layer Q-learning stress tests

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Integrating IoT Technology for Fire risk Monitoring and Assessment in residential Building design

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BUILdINGS 2025年第8期15卷

作者： Abdullahi, Usman Isah Zhang, Wei Cao, Yidan Irankunda, Georges Huazhong Univ Sci & Technol HUST Dept Civil & Hydraul Engn Wuhan 430074 Peoples R China

This research presents a pioneering framework to augment fire safety management within edifices by amalgamating real-time surveillance and adaptive evacuation methodologies. The proposed framework markedly enhances the efficacy of fire detection and the efficiency of evacuation processes. In an empirical investigation conducted on a 12-story residential structure in Wuhan, China, the implemented system achieved a 30% reduction in fire detection intervals and a 25% decrease in evacuation timeframes. The principal innovation of this framework resides in formulating an Improved risk Index (ErI), which synthesizes real-time information garnered from environmental sensors, including temperature, smoke, and carbon monoxide concentrations, with architectural configurations and fire behavior to evaluate evacuation hazards. This system realized a detection accuracy rate of 95.2% and a 40% reduction in the necessity for manual inspections, surpassing the performance of conventional fire safety systems. The synthesis of real-time data with dynamic evacuation pathways enhanced emergency response times by equipping facility managers and emergency responders with instantaneous access to critical building intelligence. The framework complies with international and local fire safety regulations, ensuring its functional applicability across diverse types of buildings. This scholarly work offers a novel, scalable approach for improving fire safety management, potentially mitigating fire-induced damage and bolstering occupant safety within contemporary structures.

关键词： BIM IoT fire safety system thinking fire dynamics simulation building project

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Monitoring the degree of Gansu Zokor damage in Chinese Pine by Hyperspectral remote Sensing

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FOrESTS 2024年第12期15卷 2074-2074页

作者： Hu, Yang Aba, Xiaoluo ren, Shien Yang, Jing He, Xin Zhang, Chenxi Lu, Yi Jiang, Yanqi Wang, Liting Chen, Yijie Mi, Xiaoqin Nan, Xiaoning Northwest A&F Univ Coll Forestry Key Lab Natl Forestry & Grassland Adm Management W Yangling 712100 Peoples R China Inst Bailongjiang Forestry Sci Gansu Prov Lanzhou 730070 Peoples R China Forest Pest Control & Quarantine Stn Ningxia Hui A Yinchuan 750021 Peoples R China Yuanzhou Dist Forestry Quarantine Stn Guyuan 756099 Peoples R China

Chinese pine has been extensively planted in the Loess Plateau, but it faces significant threats from Gansu zokor. Traditional methods for monitoring rodent damage rely on manual surveys to assess damage rates but are time-consuming and often underestimate the actual degree of damage, particularly in mildly affected pines. This study proposes a remote sensing monitoring method that integrates hyperspectral analysis with physiological and biochemical parameter models to enhance the accuracy of rodent damage detection. Using ASd Field Spec 4, we analyzed spectral data from 125 Chinese pine needles, measuring chlorophyll (CHC), carotenoid (CAC), and water content (WAC). Through correlation analysis, we identified sensitive vegetation indices (VIs) and red-edge parameters (rEPs) linked to different levels of damage. We report several key results. The 680 nm spectral band is instrumental in monitoring damage, with significant decreases in CHC, CAC, and WAC corresponding to increased damage severity. We identified six VIs and five rEPs, which were later predicted using stepwise regression (Sr), support vector machine (SVM), and random forest (rF) models. Among all models, the vegetation index-based rF model exhibited the best predictive performance, achieving coefficient of determination (r2) values of 0.988, 0.949, and 0.999 for CHC, CAC, and WAC, with root mean square errors (rMSEs) of 0.115 mg/g, 0.042 mg/g, and 0.007 mg/g, and mean relative errors (MrEs) of 8.413%, 9.169%, and 1.678%. This study demonstrates the potential of hyperspectral remote sensing technology for monitoring rodent infestations in Chinese pines, providing a reliable basis for large-scale assessments and effective management strategies for pest control.

关键词： Gansu zokor Chinese pine hyperspectral remote sensing spectral parameter physiological and biochemical parameters

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Ce-Ti catalysts modified with copper and vanadium to effectively remove slip NH_(3) and NO_x from coal-fired plants

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Journal of rare Earths 2023年第7期41卷 1022-1030,I0002页

作者： Wenjie Liu Yifei Long Shinian Liu Yongyan Zhou Xin Tong Yajie Yin Xiaoyi Li Kang Hu Jiangjun Hu School of Resource and Environmental Sciences Wuhan UniversityWuhan 430079China China Southern Power Grid Technology Co. Ltd.Guangzhou 510080China Electric Power Research Institute of Guangdong Power Grid Co.Ltd. Guangzhou 510080China

In this work,V/Ce-Ti catalysts were modified with different kinds of transition metals(Cu,Fe,Co,Mn) by sol-gel and impregnation *** NH_(3) oxidation performance of them was tested to select the most active catalyst in NH_(3)-selective catalytic oxidation(NH_(3)-SCO).The effect of NO,SO_(2) and H_(2)O was also *** experimental results indicate that 1% Cu-V/Ce-Ti catalyst exhibits the most significant ability to remove slip ammonia discharged from coal-fired plants and its NH_(3) conversion efficiency reaches90% at 300℃.In additio n,97% NO_x can be removed when NO is introduced in the ***-V/Ce-Ti catalyst also obtains good resistance to H_(2)O and SO_(2).Based on the characterization experiment,the introduced Cu and V are highly dispersed on Ce-Ti catalyst and they can increase the redox properties and the number of acidic ***,the redox cycles among Cu,V and Ce species on Cu-V/Ce-Ti catalyst surface are conducive to generating more active oxygen and promoting the oxidation capacity of the catalyst.

关键词： Ce-Ti catalyst Transition metals Slip ammonia NO reduction rare earths

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Flexible pressure sensors with ultrahigh stress tolerance enabled by periodic microslits

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Microsystems & Nanoengineering 2024年第1期10卷 301-311页

作者： Song Wang Chenying Wang Yifan Zhao Yujing Zhang Yaxin Zhang Xiangyue Xu Qijing Lin Kai Yao Yuheng Wang Feng Han Yu Sun Zhuangde Jiang State Key Laboratory for Manufacturing Systems Engineering International Joint Laboratory for Micro/Nano Manufacturing and Measurement TechnologiesSchool of Mechanical EngineeringXi’an Jiaotong UniversityXi’anChina State Key Laboratory for Manufacturing Systems Engineering International Joint Laboratory for Micro/Nano Manufacturing and Measurement TechnologiesSchool of Instrument Science and TechnologyXi’an Jiaotong UniversityXi’anChina The Faculty of Electrical Engineering and Computer Science Ningbo UniversityNingboChina Department of Mechanical and Industrial Engineering University of TorontoTorontoCanada

Stress tolerance plays a vital role in ensuring the effectiveness of piezoresistive sensing films used in flexible pressure ***,existing methods for enhancing stress tolerance employ dome-shaped,wrinkle-shaped,and pyramidal-shaped microstructures in intricate molding and demolding processes,which introduce significant fabrication challenges and limit the sensing *** address these shortcomings,this paper presents periodic microslits in a sensing film made of multiwalled carbon nanotubes and polydimethylsiloxane to realize ultrahigh stress tolerance with a theoretical maximum of 2.477 MPa and a sensitivity of 18.092 kPa−*** periodic microslits permit extensive deformation under high pressure(e.g.,400 kPa)to widen the detection ***,the periodic microslits also enhance the sensitivity based on simultaneously exhibiting multiple synapses within the sensing interface and between the periodic sensing *** proposed solution is verified by experiments using sensors based on the microslit strategy for wind direction detection,robot movement sensing,and human health *** these experiments,vehicle load detection is achieved for ultrahigh pressure sensing under an ultrahigh pressure of over 400 kPa and a ratio of the contact area to the total area of 32.74%.The results indicate that the proposed microslit strategy can achieve ultrahigh stress tolerance while simplifying the fabrication complexity of preparing microstructure sensing films.

关键词： robot shaped stress

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