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Discovery of natural few-layer graphene on the Moon

National science Review 2024年第12期11卷 76-79页

作者： Wei Zhang Qing Liang Xiujuan Li Lai-Peng Ma Xinyang Li Zhenzhen Zhao Rui Zhang Hongtao Cao Zizhun Wang Wenwen Li Yanni Wang Meiqi Liu Nailin Yue Hongyan Liu Zhenyu Hu Li Liu Qiang Zhou Fangfei Li Weitao Zheng Wencai Ren Meng Zou Key Laboratory of Automobile Materials Ministry of Education School of Materials Science & Engineering Electron Microscopy CenterInternational Center of Future Science Jilin Provincial International Cooperation Key Laboratory of High-Efficiency Clean Energy Materials Jilin University Key Laboratory of Bionic Engineering Ministry of Education Jilin University Shenyang National Laboratory for Materials Science Institute of Metal ResearchChinese Academy of Sciences Synergetic Extreme Condition High-Pressure Science Center State Key Laboratory of Superhard MaterialsCollege of Physics Jilin University Deep Space Exploration Lab Lunar Exploration and Space Engineering Center

Carbon is a fundamental element for understanding the formation and evolution of planetary bodies. The origin of the Moon has aroused intensive interest and debate, from which several hypotheses have been proposed. The prevalent giant impact theory has been strongly supported by the notion of a carbon-depleted Moon that derived from the early analysis of Apollo samples.

关键词： graphene discovery natural few-layer moon

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Research on Unpredetermined Behavior Recognition Techniques Based on Network Attacks 5

Research on Unpredetermined Behavior Recognition Techniques ...

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5th International Conference on Internet of Things, Automation and Artificial Intelligence, IoTAAI 2023

作者： Xiao, Yuxuan Fei, Jinlong Wang, Junyi State Key Laboratory of Mathematical Engineering and Advanced Computing Zhengzhou China

ISBN: (纸本)9798400716485

With the increasing number of cyber-attack behaviors, it has caused great harm to the contemporary society. Currently, the cyber attack behavior recognition module is usually implemented by adopting a strategy based on rule-base matching, which often fails to identify the attack behaviors when faced with unpreset path attack behaviors of the actual attack process due to its reliance on predefined abnormal behavior patterns and attack labels. Therefore, this paper proposes an efficient and accurate unpreset behavior detection framework for cyber-attack behaviors, introduces machine learning techniques into the identification of unpreset attack behaviors, proposes an RF-Corr feature importance assessment method based on the Kendall correlation coefficient between features and the feature weight values, and designs an unpreset attack behavior identification method based on BiLSTM neural network, which improves the current effectiveness of identification and detection for unpresetted behavior of cyber attacks, and provides a solution for artificial intelligence detection of unpresetted behavior of cyber attacks. © 2023 ACM.

关键词： Crime

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Dynamic Resampling Based Boosting Random Forest for Network Anomaly Traffic Detection 36th

Dynamic Resampling Based Boosting Random Forest for Network...

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36th International Conference on Industrial, engineering and Other Applications of Applied Intelligent Systems, IEA/AIE 2023

作者： Ren, Huajuan Wang, Ruimin Dong, Weiyu Li, Junhao Tang, Yonghe State Key Laboratory of Mathematical Engineering and Advanced Computing Zhengzhou China

ISBN: (纸本)9783031368219

Network anomaly traffic detection is an important technique for detecting intrusion activities and maintaining cyberspace security. Random forest is widely used in network anomalous traffic detection due to its good detection performance. However, Random Forest suffers from the insufficient ability to handle difficult samples and poor performance in dealing with imbalanced network traffic distribution. To address these two problems, a boosting random forest for network anomaly detection, called BRF, is proposed. The proposed method embeds the random forest model into Boosting training mechanism to enhance its classification ability for difficult samples. In the iterations, Random Forest is provided with relatively balanced and diverse training sets by dynamic resampling to alleviate the traffic imbalance problem. The effectiveness of BRF is demonstrated by multi-classification experiments on the NSL-KDD and UNSW-NB15 datasets. Compared with some shallow machine learning, deep learning, and ensemble learning methods, BRF has advantages in accuracy and time efficiency, which is a promising method for network anomaly detection. © 2023, The Author(s), under exclusive license to Springer Nature Switzerland AG.

关键词： Anomaly detection

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Realization of one-dimensional 2^(n)-root topological states in photonic lattices

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science China(Technological sciences) 2024年第1期67卷 98-104页

作者： WEI RuiShan ZHANG QingLong YANG DanDan HUANG XiongJian PAN QiWen KANG Juan QIU JianRong YANG ZhongMin DONG GuoPing State Key Laboratory of Luminescent Materials and Devices and Guangdong Provincial Key Laboratory of Fiber Laser Materials and Applied TechniquesGuangdong Engineering Technology Research and Development Center of Special Optical Fiber Materials and DevicesSchool of Materials Science and EngineeringSouth China University of TechnologyGuangzhou 510640China School of Physics and Optoelectronics South China University of TechnologyGuangzhou 510640China State Key Laboratory of Modern Optical Instrumentation College of Optical Science and EngineeringZhejiang UniversityHangzhou 310027China

Square-root topological insulators recently discovered are intriguing topological *** possess topological properties inherited from the squared Hamiltonian and exhibit double-band *** mechanism of the square root was generalized to 2^(n)-root topological insulators,giving rise to more band *** this study,we describe the experimental realization of onedimensional 2^(n)-root topological insulators in photonic waveguide arrays using the archetypical Su-Schrieffer-Heeger(SSH)*** edge states with tunable numbers are clearly observed under visible *** particular,we visualized the dynamic evolutions of the light propagation by varying the sample lengths,which further proved the localization and multiple numbers of edge states in 2^(n)-root topological *** experiment,which involves constructing 2^(n)-root topological photonic lattices in various geometric arrangements,provides a stable platform for studying topological states that exhibit a remarkable degree of flexibility and control.

关键词： 2^(n)-root topological insulators multiple edge states photonic waveguide arrays light dynamics

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Polypropylene-based blend with enhanced breakdown strength under gamma-ray irradiation for cable insulation

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Nuclear science and Techniques 2025年第1期36卷 35-48页

作者： Bai-Xin Liu Yu Gao Jing Li Chen-Yi Guo Bo-Sen Si Jun-Guo Gao Yu Chen Bo-Xue Du School of Electrical and Information Engineering Tianjin UniversityTianjin 300072China Key Laboratory of Engineering Dielectrics and Its Application Ministry of EducationHarbin University of Science and TechnologyHarbin 150080China State Key Laboratory of Electrical Insulation and Power Equipment Xi’an Jiaotong UniversityXi’an 710049China

This study focuses on the electrical properties and microstructure of polypropylene(PP)-based blends used for cable insulation in nuclear power plants(NPPs).The PP-based blend,comprising isotactic PP and propylene-based elastomer(PBE)at concentrations ranging from 0 to 50 wt%,underwent a melt blending process and subsequent cobalt-60 gamma-ray irradiation with doses ranging from 0 to 250 *** conductivity,trap distribution,and alternating(AC)breakdown strength were chosen to assess the insulation *** results indicate that the addition of PBE significantly improves the electrical properties of PP under *** PP,the electrical conductivity increased with irradiation,whereas the trap depth and breakdown strength decreased ***,for the blend,these changes initially exhibit opposite *** the irradiation was increased to 250 kGy,the AC breakdown strength of the blend improved by more than 21%compared to that of *** physical and chemical structures of the samples were investigated to explore the improvement *** results offer insights into the design of new cable-insulation materials suitable for NPPs.

关键词： Nuclear power plant Cable insulation Polypropylene Electrical properties Gamma-ray irradiation

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Improving aircraft nose wheel steering stability based on control continuation method

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science China(Technological sciences) 2025年第3期68卷 258-277页

作者： Qiaozhi YIN Dexu KONG Jiawei WANG Hong NIE Xiaohui WEI National Key Laboratory of Helicopter Aeromechanics Nanjing210016China State Key Laboratory of Mechanics and Control for Aerospace Structures Nanjing210016China Key Laboratory of Fundamental Science for National Defense-Advanced Design Technology of Flight Vehicle Nanjing210016China AVIC Nanjing Engineering Institute of Aircraft Systems Nanjing211106China

Aircraft steering instability during the taxiing process sometimes occurs resulting from the unstable bifurcation phenomena of the nonlinear steering dynamic system,which may lead to severe *** this study,the control parameter design of an aircraft nose wheel steering control system based on the control continuation method is proposed to reduce the number of unstable bifurcation points and enlarge the system stable region area in a certain parameter ***,the aircraft turning performance can be improved ***,a nonlinear aircraft rollout dynamic model is constructed,and the aircraft ground steering bifurcation characteristics are obtained under the open-loop steering control ***,the bifurcation performances under three closed-loop nose wheel steering controllers based on the feedback control method are compared,and the control parameter of the quadratic nonlinear controller with a better bifurcation control effect is selected as a second bifurcation parameter to analyze the directional system stability via two-parameter bifurcation ***,the influence of a crosswind on the aircraft ground steering bifurcation performance is studied for various control parameter ***,the control effects of a traditional proportional-integral-derivative(PID)nose wheel steering control law and the designed feedback controller are compared and ***,a semi-physical experiment of the aircraft nose wheel steering system is carried out,and different control parameter values are selected for test verification,which can further verify the control effect of the designed nonlinear feedback *** results indicate that the feedback control method is unable to vary the system bifurcation types,but appropriate control parameter design can effectively shrink the system instability region and even eliminate the unstable Hopf bifurcation points under some specific working conditions,improving the aircraft ground turning stability re

关键词： aircraft taxiing dynamics and stability nose wheel steering control system control continuation steering bifurcation characteristics quadratic feedback control

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Progress and prospects of chiral nanomaterials for biosensing platforms

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Rare Metals 2024年第6期43卷 2469-2497页

作者： Yu-Cheng Ouyang Bong-Jun Yeom Yuan Zhao Wei Ma School of Food Science and Technology State Key Laboratory of Food Science and ResourcesJiangnan UniversityWuxi 214122China Key Laboratory of Synthetic and Biological Colloids Ministry of EducationSchool of Chemical and Material EngineeringJiangnanUniversityWuxi214122China Department of Chemical Engineering Hanyang UniversitySeoul04763RepublicofKorea

Chiral nanomaterials have distinct chiroptical properties of preferential interactions to circularly polarized ***-based biosensors have emerged for detection of biomolecules,ions and cells in recent *** review provides an extensive overview of biosensors based on chiral nanomaterials,starting with approaches to chiral nanomaterials construction in terms of fabrication *** of chiral nanomaterials and their biosensor applications is presented for different material types,with special emphasis on the role and importance of material properties and signal generation in *** assessed the technological prospects of the emerging fields of chiral construction,circularly polarized luminescence,Raman optical activity and so on along with their current *** venues for future research on chiral nanomaterials in fabrication,biosensing,disease diagnosis and treatment are also presented in the review.

关键词： Chiral nanomaterials Circular dichroism Biosensors

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Synthesis of structurally chiral nickel oxide nanostructures for enhanced spin-dependent oxygen electrocatalysis

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Nano Research 2025年第3期18卷 341-346页

作者： Yiran Jin Yang Cheng Shenghe Dong Chengyu Xiao Zhi Chen Peng-peng Wang State Key Laboratory for Mechanical Behavior of Materials Shaanxi International Research Center for Soft MatterSchool of Materials Science and EngineeringXi’an Jiaotong UniversityXi’an 710049China

Chiral inorganic materials with unique asymmetries hold promising potential in several fields,including catalytic ***,imparting structural chirality to inorganic materials presents substantial challenges that hinders their exploration in many *** this study,we report a simple two-step method for synthesizing structurally chiral nickel oxides(NiO)nanostructures and demonstrate that the chiral-induced spin-selective mechanism enhances the catalytic performance during electrocatalytic oxygen evolution reaction(OER).Compared to their achiral NiO counterparts,the chiral NiO nanostructures not only improve the reaction kinetics(a 60 mV reduction in overpotential),but also effectively modulate the reaction pathway to inhibit the byproduct hydrogen peroxide *** neutral conditions,this modulation results in a 4.5-fold reduction in hydrogen peroxide *** work enriches the variety of chiral inorganic nanomaterials and paves the way for the development and application of chiral inorganic nanomaterials in spin-dependent processes.

关键词： chirality inorganic nanostructures nickel oxide oxygen evolution reaction

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Multi-modal imaging for dynamic visualization of osteogenesis and implant degradation in 3D bioprinted scaffolds

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Bioactive Materials 2024年第7期37卷 119-131页

作者： Qian Feng Kanwal Fatima Ai Yang Chenglin Li Shuo Chen Guang Yang Xiaojun Zhou Chuanglong He State Key Laboratory for Modification of Chemical Fibers and Polymer Materials College of Biological Science and Medical EngineeringDonghua UniversityShanghai201620China

In situ monitoring of bone regeneration enables timely diagnosis and intervention by acquiring vital biological ***,an existing gap exists in the availability of effective methodologies for continuous and dynamic monitoring of the bone tissue regeneration process,encompassing the concurrent visualization of bone formation and implant ***,we present an integrated scaffold designed to facilitate real-time monitoring of both bone formation and implant degradation during the repair of bone ***(Lap),CyP-loaded mesoporous silica(CyP@MSNs)and ultrasmall superparamagnetic iron oxide nanoparticles(USPIO@SiO2)were incorporated into a bioink containing bone marrow mesenchymal stem cells(BMSCs)to fabricate functional scaffolds denoted as C@M/GLU using 3D bioprinting *** both in vivo and in vitro experiments,the composite scaffold has demonstrated a significant enhancement of bone regeneration through the controlled release of silicon(Si)and magnesium(Mg)*** near-infrared fluorescence(NIR-FL)imaging,the composite scaffold facilitates the monitoring of alkaline phosphate(ALP)expression,providing an accurate reflection of the scaffold’s initial osteogenic ***,the degradation of scaffolds was monitored by tracking the changes in the magnetic resonance(MR)signals at various time *** findings indicate that the designed scaffold holds potential as an in situ bone implant for combined visualization of osteogenesis and implant degradation throughout the bone repair process.

关键词： In situ monitoring 3D bioprinting Magnetic resonance imaging Near-infrared fluorescence Implant degradation Bone regeneration

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Ship Weather Routing Based on Hybrid Genetic Algorithm Under Complicated Sea Conditions

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Journal of Ocean University of China 2023年第1期22卷 28-42页

作者： ZHOU Peng ZHOU Zheng WANG Yan WANG Hongbo State Key Laboratory on Integrated Optoelectronics College of Electronic Science and EngineeringJilin UniversityJilin 130012China

Considering the effects of increased economic globalization and global warming,developing methods for reducing shipping costs and greenhouse gas emissions in ocean transportation has become *** to its key role in modern navigation technology,ship weather routing is the research focus of several scholars in this *** study presents a hybrid genetic algorithm for the design of an optimal ship route for safe transoceanic navigation under complicated sea *** the basis of the basic genetic algorithm,simulated annealing algorithm is introduced to enhance its local search ability and avoid premature convergence,with the ship’s voyage time and fuel consumption as optimization ***,a mathematical model of ship weather routing is developed based on the grid system.A measure of fitness calibration is proposed,which can change the selection pressure of the algorithm as the population *** addition,a hybrid crossover operator is proposed to enhance the ability to find the optimal solution and accelerate the convergence speed of the ***,a multi-population technique is applied to improve the robustness of the algorithm using different evolutionary strategies.

关键词： genetic algorithm simulated annealing algorithm weather routing ship speed loss

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