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Evolution of the porous structure for phosphoric acid etching carbon as cathodes in Li–O_(2) batteries:Pyrolysis temperature-induced characteristics changes

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Carbon Energy 2024年第1期6卷 172-181页

作者： Feiyang Yang Ying Yao Yunkai Xu Cong Wang Meiling Wang Jingjie Ren Cunzhong Zhang Feng Wu Jun Lu Beijing Key Laboratory of Environmental Science and Engineering School of Materials Science and EngineeringBeijing Institute of TechnologyBeijingChina Beijing Institute of Technology Chongqing Innovation Center ChongqingChina College of Chemical and Biological Engineering Zhejiang UniversityHangzhouChina

Although biomass-derived carbon(biochar)has been widely used in the energy field,the relation between the carbonization condition and the physical/chemical property of the product remains ***,we revealed the carbonization condition's effect on the morphology,surface property,and electrochemical performance of the obtained *** open slit pore structure with shower-puff-like nanoparticles can be obtained by finely tuning the carbonization temperature,and its unique pore structure and surface properties enable the Li–O_(2) battery with cycling longevity(221 cycles with 99.8%Coulombic efficiency at 0.2 mA cm^(−2) and controlled discharge–charge depths of 500 mAh g^(−1))and high capacity(16,334 mAh g^(−1) at 0.02 mA cm^(−2)).This work provides a greater understanding of the mechanism of the biochar carbonization procedure under various pyrolysis conditions,paving the way for future study of energy storage devices.

关键词： biomass Li-O_(2) battery oxygen catalysts porous carbon temperature parameters

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A new quantum key distribution resource allocation and routing optimization scheme

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Chinese Physics B 2024年第3期33卷 244-259页

作者：毕琳袁晓同吴炜杰林升熙 School of Computer Science and Technology Changchun University of Science and TechnologyChangchun 130012China Key Laboratory of Network and Information Security in Jilin Province Changchun 130012China

Quantum key distribution(QKD)is a technology that can resist the threat of quantum computers to existing conventional cryptographic ***,due to the stringent requirements of the quantum key generation environment,the generated quantum keys are considered valuable,and the slow key generation rate conflicts with the high-speed data transmission in traditional optical *** this paper,for the QKD network with a trusted relay,which is mainly based on point-to-point quantum keys and has complex changes in network resources,we aim to allocate resources reasonably for data packet ***,we formulate a linear programming constraint model for the key resource allocation(KRA)problem based on the time-slot ***,we propose a new scheduling scheme based on the graded key security requirements(GKSR)and a new micro-log key storage algorithm for effective storage and management of key ***,we propose a key resource consumption(KRC)routing optimization algorithm to properly allocate time slots,routes,and key *** results show that the proposed scheme significantly improves the key distribution success rate and key resource utilization rate,among others.

关键词： quantum key distribution(QKD) resource allocation key storage routing algorithm

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Cartilage-targeting and inflammatory-responsive nanocarriers for effective osteoarthritis treatment via reactive oxygen species scavenging and anti-angiogenesis

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Journal of Materials science & technology 2023年第12期143卷 30-42页

作者： Sixiang Wang Yan Gao Lili Dong Peixing Chen Wanqian Liu Li Yang National Innovation and Attracting Talents“111”base Key Laboratory of Biorheological Science and TechnologyMinistry of EducationCollegeof BioengineeringChongqing UniversityChongqing 400030China Department of Orthopaedics The First Affiliated Hospital of Chongqing Medical UniversityChongqing 400042China Chongqing Key Laboratory of Nano/Micro Composite Material and Device School of Metallurgy and Materials EngineeringChongqing University of Science and TechnologyChongqing 401331China

Osteoarthritis(OA),a common disabling joint disease,is highly associated with microenvironmental changes in the cartilage and subchondral *** reactive oxygen species(ROS)in the cartilage and subchondral bone angiogenesis accelerate articular cartilage *** cartilage-targeting drug deliv-ery systems that are aimed at preventing ROS production and angiogenesis may be of clinical significance for OA ***,an ROS scavenger and an inflammatory-responsive nanocarrier are designed by immobilizing the natural polyphenol(curcumin)in chitosan-catechol nanoformulations(Cur-CS-C NPs)via boronate *** robust cartilage-targeting effects and ROS scavenging capacities of Cur-CS-C NPs were respectively determined in cartilage explants and ***-articular injection of Cur-CS-C NPs in OA rat models efficiently suppressed angiogenesis and cartilage degradation partially via the ROS-mediated NF-κB/PI3K-Akt signaling *** developed curcumin-functionalized nanocarriers can significantly delay OA progression and provide a promising therapeutic strategy for other inflamma-tory diseases that are characterized by oxidative stress and angiogenesis.

关键词： Osteoarthritis Reactive oxygen species Angiogenesis Cartilage-targeting Drug delivery systems Chitosan-catechol nanocarriers

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Heterogeneous Network Embedding Method Based on Hyperbolic Space 5

Heterogeneous Network Embedding Method Based on Hyperbolic S...

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5th International Conference on Information science, Parallel and Distributed Systems, ISPDS 2024

作者： Yang, Jie Wu, Yu Chongqing University of Posts and Telecommunications College of Computer Science and Technology Chongqing China Chongqing University of Posts and Telecommunications Key Laboratory of Web Intelligence and Technology Chongqing China

ISBN: (纸本)9798350352719

The core of heterogeneous network embedding is to transform nodes and edges into low and dense vector representations while preserving the structural features and semantic information of the original network. The existing embedding methods based on European space can not store the hierarchical structure of the network, nor can capture the rich semantic information contained in the heterogeneous network. To improve the embedding quality of heterogeneous networks and reduce information loss, a hyperbolic space-based embedding method for heterogeneous networks is proposed. Firstly, a random walk guided by meta-path is used to obtain the node neighborhood information and semantic relation of the network. Then the heterogeneous network is embedded into hyperbolic space based on Poincare sphere model, and the Riemann stochastic gradient descent method is used to optimize the model. Experiments on multiple datasets show that the proposed method has better performance than other baseline methods, and preserves more complete network information with fewer dimensions of storage space. © 2024 IEEE.

关键词： Network embeddings

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Synergetic effect of natural ageing and pre-stretching on the ageing behavior in Tʹ/ηʹ phase-strengthened Al-Zn-Mg-Cu alloys

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Journal of Materials science & technology 2023年第15期146卷 240-251页

作者： Yan Zou Lingfei Cao Xiaodong Wu Songbai Tang Mingxing Guo Engineering Research Center for Waste Oil Recovery Technology and Equipment Ministry of EducationChongqing Technology and Business UniversityChongqing 400067China International Joint Laboratory for Light Alloys(Ministry of Education) College of Materials Science and EngineeringChongqing UniversityChongqing 400044China Shenyang National Laboratory for Materials Science Chongqing UniversityChongqing 400044China State Key Laboratory for Advanced Metals and Materials University of Science and TechnologyBeijing 100083China

Al-Zn-Mg-Cu alloys with different major strengthening precipitates are subjected to a novel combinatorial pre-treatment,including natural ageing and *** evolution of hardness and microstructure during the combinatorial pre-treatment and subsequent artificial ageing has been *** results reveal that the growth rate of hardness in alloy B(Zn/Mg=10.0)is much higher than that of alloy A(Zn/Mg=1.5)due to the fast precipitation kinetics ofηphase compared with T *** GP I zones and dislocations introduced by the combinatorial pre-treatment can act as heterogeneous nucleation sites for precipitation,resulting in more precipitates and higher hardness than pre-stretched alloys A and *** distribute uniformly in combinatorial pre-treated alloys owing to the existence of GP I zones and dislocations,which promote the precipitation and refine the precipitate ***,these alloys with distinct pre-stretching(2%–10%)show similar precipitation behavior and peak hardness,and it indicates that the dislocation-induced precipitation will not be affected by the density of dislocations when plenty of GP I zones pre-exist.

关键词： Combinatorial pre-treatment Zn/Mg ratio Ageing behavior Microstructure evolution

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Effect of initial grain size on the recrystallization behavior and recrystallization texture of a Mg-3Gd alloy

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Journal of Materials science & technology 2024年第21期188卷 169-182页

作者： Fang Han Xuan Luo Knut Marthinsen Guilin Wu Ziyong Hou Xiaoxu Huang International Joint Laboratory for Light Alloys(MOE) College of Materials Science and EngineeringChongqing UniversityChongqing 400044China Key Laboratory for Light-weight Materials Nanjing Tech UniversityNanjing 210009China Department of Materials Science and Engineering Norwegian University of Science and TechnologyTrondheim 7491Norway Beijing Advanced Innovation Center for Materials Genome Engineering University of Science and Technology BeijingBeijing 100083China Shenyang National Laboratory for Materials Science Chongqing UniversityChongqing 400044China

The effect of initial grain size on the recrystallization and recrystallization texture of a rolled Mg–3Gd(wt.%)alloy is studied in *** results show that the deformation microstructure of an initially coarse-grained(CG)sample has a larger twinned area and a higher density of twin boundaries than a fine-grained(FG)*** annealing,the CG sample recrystallizes preferentially in the twinned area,whereas the FG sample adopts the higher density grain boundaries as the nucleation ***,weak recrystallization texture components appear from the grain nucleation stage,regardless of the initial grain size,and are preserved after complete recrystallization due to uniform grain *** majority of recrystallization texture is deviated 20°–45°away from normal direction(ND),accounting for more than 50%.Especially,the recrystallization texture of the FG sample is a“Rare Earth texture”,in contrast to the widely reported texture modification unrelated to grain boundary *** a scattered basal texture is observed in the CG sample,which also differs from the reported“Rare Earth texture”originating from shear band nucleation in dilute Mg–Gd ***,based on the Johnson–Mehl–Avrami–Kolmogorov(JMAK)model,the recrystallization kinetics are calculated,and it is found that the initial grain size mainly affects the nucleation rate,and has limited effect on the grain growth rate.

关键词： Mg-3Gd Grain size Microstructure evolution Recrystallization texture Recrystallization kinetics

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Valleytronic topological filters in silicene-like inner-edge systems

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Chinese Physics B 2024年第1期33卷 66-74页

作者：谢航吕小龙杨加恩 College of Physics Chongqing UniversityChongqing 401331China Chongqing Key Laboratory for Strongly-Coupled Physics Chongqing UniversityChongqing 401331China College of Science Guangxi University of Science and TechnologyLiuzhou 545006China School of Electronics and IoT Chongqing College of Electronic EngineeringChongqing 401331China

Inner edge state with spin and valley degrees of freedom is a promising candidate for designing a dissipationless device due to the topological protection. The central challenge for the application of the inner edge state is to generate and modulate the polarized currents. In this work, we discover a new mechanism to generate fully valley-and spin–valley-polarized current caused by the Bloch wavevector mismatch(BWM). Based on this mechanism, we design some serial-typed inner-edge filters. By using once of the BWM, the coincident states could be divided into transmitted and reflected modes, which can serve as a valley or spin–valley filter. In particular, while with twice of the BWM, the incident current is absolutely reflected to support an off state with a specified valley and spin, which is different from the gap *** findings give rise to a new platform for designing valleytronics and spin-valleytronics.

关键词： topological insulator inner-edge state valley polarization spin polarization quantum transport

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DRL-Based Time-Varying Workload Scheduling With Priority and Resource Awareness

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IEEE Transactions on Network and Service Management 2025年第3期22卷 2838-2852页

作者： Liu, Qifeng Fan, Qilin Zhang, Xu Li, Xiuhua Wang, Kai Xiong, Qingyu Chongqing University School of Big Data and Software Engineering Chongqing400044 China Chongqing University Key Laboratory of Dependable Service Computing in Cyber Physical Society of Ministry of Education Chongqing400044 China Nanjing University School of Electronic Science and Engineering Nanjing210023 China Haihe Laboratory of Information Technology Application Innovation Tianjin300072 China Harbin Institute of Technology School of Computer Science and Technology Weihai264209 China Shandong Key Laboratory of Industrial Network Security Weihai264209 China

With the proliferation of cloud services and the continuous growth in enterprises' demand for dynamic multi-dimensional resources, the implementation of effective strategy for time-varying workload scheduling has become increasingly significant. In this paper, we propose a deep reinforcement learning (DRL)-based method for time-varying workload scheduling, aiming to allocate resources efficiently across servers in the cluster. Specifically, we integrate a classifier and queue scorer to construct a priority queue that exploits temporal resource utilization patterns across different workload classes. Then, we design parallel graph attention layers to capture the dimensional features and temporal dynamics of cloud server cluster. Moreover, we propose a DRL algorithm to generate scheduling strategies that can adapt to dynamic environments. Validation on real-world traces from Google cluster demonstrates that our method outperforms existing approaches in key metrics of cloud server cluster management. © 2004-2012 IEEE.

关键词： Cloud platforms

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OSFS-Vague: Online streaming feature selection algorithm based on vague set

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CAAI Transactions on Intelligence technology 2024年第6期9卷 1451-1466页

作者： Jie Yang Zhijun Wang Guoyin Wang Yanmin Liu Yi He Di Wu School of Physics and Electronic Science Zunyi Normal UniversityZunyiChina Key Laboratory of Big Data Intelligent Computing Chongqing University of Posts and TelecommunicationsChongqingChina Department of Computer Science Old Dominion UniversityNorfolkVirginiaUSA College of Computer and Information Science Southwest UniversityChongqingChina

Online streaming feature selection(OSFS),as an online learning manner to handle streaming features,is critical in addressing high-dimensional *** real big data-related applications,the patterns and distributions of streaming features constantly change over time due to dynamic data generation ***,existing OSFS methods rely on presented and fixed hyperparameters,which undoubtedly lead to poor selection performance when encountering dynamic *** make up for the existing shortcomings,the authors propose a novel OSFS algorithm based on vague set,named *** main idea is to combine uncertainty and three-way decision theories to improve feature selection from the traditional dichotomous method to the trichotomous ***-Vague also improves the calculation method of correlation between features and ***,OSFS-Vague uses the distance correlation coefficient to classify streaming features into relevant features,weakly redundant features,and redundant ***,the relevant features and weakly redundant features are filtered for an optimal feature *** evaluate the proposed OSFS-Vague,extensive empirical experiments have been conducted on 11 *** results demonstrate that OSFS-Vague outperforms six state-of-the-art OSFS algorithms in terms of selection accuracy and computational efficiency.

关键词： feature selection online feature selection three-way decision vague set

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Research on the quasi-isentropic driving model of aluminized explosives in the detonation wave propagation direction

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Defence technology（防务技术） 2024年第2期32卷 596-618页

作者： Hongfu Wang Yan Liu Fan Bai Chao He Yingliang Xu Qiang Zhou Chuan Xiao Fenglei Huang State Key Laboratory of Explosion Science and Technology Beijing Institute of TechnologyBeijing100081China China Research and Development Academy of Machinery Equipment Beijing100089China Beijing Institute of Technology Chongqing Innovation Center Chongqing401120China

Taking CL-20(Hexanitrohexaazaisowurtzitane)-based aluminized explosives with high gurney energy as the research object, this research experimentally investigates the work capability of different aluminized explosive formulations when driving metal flyer plates in the denotation wave propagation *** research results showed that the formulations with 43 μm aluminum(Al) powder particles(The particle sizes of Al powder were in the range of 2~43 μm) exhibited the optimal performance in driving flyer plates along the denotation wave propagation direction. Compared to the formulations with Al powder 13 μm, the formulations with Al powder 2 μm delivered better performance in accelerating metal flyer plates in the early stage, which, however, turned to be poor in the later stage. The CL-20-based explosives containing 25% Al far under-performed those containing 15% Al. Based on the proposed quasi-isentropic hypothesis, relevant isentropy theories, and the functional relationship between detonation parameters and entropy as well as Al reaction degree, the characteristic lines of aluminized explosives in accelerating flyer plates were theoretically studied, a quasi-isentropic theoretical model for the aluminized explosive driving the flyer plate was built and the calculation methods for the variations of flyer plate velocity, Al reaction degree, and detonation product parameters with time and axial positions were developed. The theoretical model built is verified by the experimental results of the CL-20-based aluminized explosive driving flyer plate. It was found that the model built could accurately calculate the variations of flyer plate velocity and Al reaction degree over time. In addition, how physical parameters including detonation product pressure and temperature varied with time and axial positions was identified. The action time of the positive pressure after the detonation of aluminized explosives was found prolonged and the downtrend of the temperature was

关键词： Aluminized explosive Flyer plate experiment Quasi-isentropic theoretical model Al reaction Driving characteristics

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