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Dual nanoprecipitation and nanoscale chemical heterogeneity in a secondary hardening steel for ultrahigh strength and large uniform elongation

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Journal of Materials science & technology 2024年第18期185卷 245-258页

作者： Shidong Wang Jinhua Wang Shijie Zhang Daixiu Wei Yang Chen Xuequan Rong Wu Gong Stefanus Harjo Xiaochun Liu Zengbao Jiao Zhigang Yang Gang Sha Chunxu Wang Guang Chen Hao Chen Key Laboratory for Advanced Materials of Ministry of Education School of Materials Science and EngineeringTsinghua UniversityBeijing 100084China School of Materials Science and Engineering/Herbert Gleiter Institute of Nanoscience Nanjing University of Science and TechnologyNanjing 210094China National Key Laboratory of Advanced Casting Technologies MIIT Key Laboratory of Advanced Metallic and Intermetallic Materials TechnologyEngineering Research Center of Materials Behavior and DesignMinistry of EducationNanjing University of Science and TechnologyNanjing 210094China J-PARC Center Japan Atomic Energy AgencyIbaraki 319-1195Japan Institute of Metals College of Materials Science and EngineeringChangsha University of Science&TechnologyChangsha 410114China Department of Mechanical Engineering Research Institute for Advanced ManufacturingThe Hong Kong Polytechnic UniversityHong Kong 999077China Central Iron and Steel Research Institute Beijing 100081China

Nanoprecipitates and nanoscale retained austenite(RA)with suitable stability play crucial roles in deter-mining the yield strength(YS)and ductility of ultrahigh strength steels(UHSSs).However,owing to the kinetics incompatibility between nanoprecipitation and austenite reversion,it is highly challenging to si-multaneously introduce high-density nanoprecipitates and optimized RA in *** this work,through the combination of austenite reversion treatment(ART)and subsequent flash austenitizing(FA),nanoscale chemical heterogeneity was successfully introduced into a low-cost UHSS prior to the aging *** chemical heterogeneity involved the enrichment of Mn and Ni in the austenite *** resulting UHSS exhibited dual-nanoprecipitation of Ni(Al,Mn)and(Mo,Cr)_(2)C and nanoscale austenite stabilized via Mn and Ni *** hard martensitic matrix strengthened by high-density dual-nanoprecipitates con-strains the plastic deformation of soft RA with a relatively low fraction of-15%,and the presence of relatively stable nanoscale RA with adequate Mn and Ni enrichment leads to a marginal loss in YS but keeps a persistent transformation-induced plasticity(TRIP)*** a result,the newly-developed UHSS exhibits an ultrahigh YS of-1.7 GPa,an ultimate tensile strength(UTS)of-1.8 GPa,a large uniform elongation(UE)of-8.5%,and a total elongation(TE)of-13%.The strategy of presetting chemical heterogeneity to introduce proper metastable phases before aging can be extended to other UHSSs and precipitation-hardened alloys.

关键词： Ultrahigh strength steels Dual-nanoprecipitation Austenite stability TRIP effect Phase transformation

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Effects of anode material on the evolution of anode plasma and characteristics of intense electron beam diode

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Plasma science and technology 2023年第9期25卷 82-90页

作者：华叶吴平万红白书欣龚瑾瑜朱梦白现臣张广帅 Key Laboratory of Advanced Science and Technology on High Power Microwave Northwest Institute of Nuclear TechnologyXi’an 710024People’s Republic of China College of Aerospace Science and Engineering National University of Defense TechnologyChangsha 410073People’s Republic of China

In this paper,three kinds of materials including graphite,titanium(Ti)and molybdenum(Mo)are used as anodes to figure out the influence factors of anode material on the characteristics of the intense electron beam *** results show that the characteristics of diode are mainly determined by the cathode plasma motion under a 15 mm diode gap,in which the typical electron beam parameters are 280 kV,3.5 *** the diode gap is reduced to 5 mm,the voltage of the electron beam reduces to about 200 kV,and its current increases to more than 8.2 *** is calculated that the surface temperatures of Ti and Mo anodes are higher than their melting *** diode plasma luminescence images show that Ti and Mo anodes produce plasmas soon after the bombardment of electron *** and Mo lines are respectively found in the plasma composition of Ti and Mo anode *** melting traces are also observed on Ti and Mo anodes by comparing the micromorphologies before and after bombardment of the electron *** results suggest that the time of anode plasma generation is closely related to the anode *** with graphite,metal Ti and Mo anodes are more likely to produce large amounts of plasma due to their more significant temperature rise *** to the moment that anode plasma begins to generate,the average expansion velocities of cathode and anode plasma are estimated by fitting the improved space-charge limited flow *** reveals that generation and motion of the anode plasma significantly affect the characteristics of intense electron beam diode.

关键词： anode material anode plasma intense electron beam plasma expanding velocity

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Synthesis of crystal-phase and color tunable mixed anion co-doped titanium oxides and their controllable photocatalytic activity

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International Journal of Minerals,Metallurgy and Materials 2023年第10期30卷 2036-2043页

作者： Jingdi Cao Takuya Hhasegawa Yusuke Asakura Akira Yamakata Peng Sun Wenbin Cao Shu Yin Institute of Multidisciplinary Research for Advanced Materials Senda 980-8577Japan Kagami Memorial Research Institute for Materials Science and Technology Waseda UniversityShinju-ku 169-0051Japan Graduate School of Natural Science and Technology Okayama UniversityOkayama 700-8530Japan University of Science and Technology Beijing Beijing 100083China Advanced Institute for Materials Research(WPI-AIMR) Tohoku UniversitySendai 980-8577Japan

B and N mixed anions co-doped titania with various crystal phases such as anatase,brookite,and rutile were successfully synthesized by a hydrothermal synthesis followed by heat treatment in an ammonia gas atmosphere at 550-650℃(denoted as BN-Ana_x,BN-Bro_x,and BN-Rut_x,x is the treatment temperature).The colors of as-prepared BN-Ana,BN-Bro,and BN-Rut are red,yellow-green,and cyangreen,*** color changing mechanism of titania was related to their various band gap structure and the existence of B-N *** nitridation temperature exhibits effective color changing compared to that of nitridation *** different phases of the mixed anion codoped titania possess different photocatalytic deNO_(x) *** BN-Ana and BN-Rut show poor photocatalytic deNO_(x) activity,while the BN-Bro shows excellent photocatalytic deNO_(x) activity,better than that of standard titania photocatalyst Degussa *** colorful titania with low-photocatalytic activity is heavy metal elements free,indicating their possible applications as nontoxic color pigments or novel cosmetic raw materials.

关键词： colorful titania toxic elements free mixed anion compounds pigment photocatalytic activity cosmetic application

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Design,fabrication,and dynamic mechanical responses of fiber-reinforced composite lattice materials

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International Journal of Mechanical System Dynamics 2023年第3期3卷 213-228页

作者： Jian Xiong Cheng Gong Qianqian Wu Li Ma Jinshui Yang Linzhi Wu Center for Composite Materials and Structures Harbin Institute of TechnologyHarbinChina National Key Laboratory of Science and Technology on Advanced Composites in Special Environments Harbin Institute of TechnologyHarbinChina

Fiber-reinforced composites are a popular lightweight materials used in a variety of engineering applications,such as aerospace,architecture,automotive,and marine construction,due to their attractive mechanical *** lattice materials from fiber-reinforced composites is an efficient approach for developing ultra-lightweight structural systems with superior mechanical proper-ties and multifunctional *** contrast to corrugated,foam,and honeycomb core materials,composite lattice materials can be manufactured with various architectural designs,such as woven,grid,and truss ***,lattice materials with open-cell topology provide multifunctional advantages over conventional closed-cell honeycomb and foam structures and are thus highly desirable for developing aerospace systems,hypersonic vehicles,long-range rockets and missiles,ship and naval structures,and protective *** objective of this study is to review and analyze dynamic mechanical behavior performed by different researchers in the area of composite lattice materials and to highlight topics for future research.

关键词： fiber-reinforced composite lattice structures sandwich structures dynamic mechanical behavior

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Analyzing Brain Damages in Children with Image Processing Using KNN and FCM Algorithms

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SN Computer science 2024年第1期5卷 62页

作者： Kayathri, B. Prasanna, S. School of Computing Sciences Vels Institute of Science Technology and Advanced Studies Tamil Nadu Chennai India Department of Computer Applications Vels Institute of Science Technology and Advanced Studies Tamil Nadu Chennai India

In current scenario, children are addicted towards mobile communication devices such as mobile phone, tablet and various wireless devices. Exploring more radio frequencies with these devices causes brain damage in children aged 5–10 years. This paper uses an original calculation for the examination of the cerebral image. Typically, an MRI scan or CT scan will show the Cerebrum’s living structures. The brain of children is scanned in MRI and analyzed through image processing to know whether the children put their lives in danger or not, parents should be aware of their kids’ true health. The analysis of training data selected from MRI scan pictures yields 96.3% accuracy in determining the outcomes through examination of the children’s brains. Hence, the findings of brain analyses on various children are examined. Thus, the existing methods to analysis on finding brain damage which is not enough to sort out the problem still, so proposed method is needed to find Brain Damage Findings (BDF) which has to work prominently compared with the existing methods of FCM and KNN with unique test and trained data of brain. © 2023, The Author(s), under exclusive licence to Springer Nature Singapore Pte Ltd.

关键词： Communication devices CT (Computerized Tomography) Damage FCM (Fuzzy C-Means) KNN (K-Nearest Neighbour) MRI (Magnetic Resonance Imaging)

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Single‑Crystal Diamond Nanowires Embedded with Platinum Nanoparticles for High‑Temperature Solar‑Blind Photodetector

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Nano-Micro Letters 2025年第9期17卷 348-362页

作者： Jiaqi Lu Xinglai Zhang Shun Feng Bing Yang Ming Huang Yubin Guo Lingyue Weng Nan Huang Lusheng Liu Xin Jiang Dongming Sun Huiming Cheng School of Materials Science and Engineering University of Science and Technology of ChinaShenyang 110016People’s Republic of China Shenyang National Laboratory for Materials Science Institute of Metal ResearchChinese Academy of SciencesShenyang 110016People’s Republic of China School of Environment and Chemical Engineering Shenyang University of TechnologyShenyang 110870People’s Republic of China Institute of Materials Engineering University of Siegen57076 SiegenGermany Institute of Technology for Carbon Neutrality Shenzhen Institute of Advanced TechnologyChinese Academy of SciencesShenzhen 518055People’s Republic of China

Diamond,an ultrawide-bandgap semiconductor material,is promising for solar-blind ultraviolet photodetectors in extreme ***,when exposed to high-temperature conditions,diamond photodetector surfaces are unavoidably terminated with oxygen,leading to low *** address this limitation,single-crystalline diamond nanowires(DNWs)embedded with platinum(Pt)nanoparticles were developed using Pt film deposition followed by chemical vapor deposition(CVD)homoepitaxial *** the CVD,Pt nanoparticles(approximately 20 nm in diameter)undergo dewetting and become uniformly embedded within the single-crystalline *** fabricated with these Pt nanoparticles-embedded DNWs achieve a responsivity of 68.5 A W^(−1) under 220 nm illumination at room temperature,representing an improvement of approximately 2000 times compared to oxygen-terminated bulk diamond ***,the responsivity further increases with temperature,reaching an exceptional value of 3098.7 A W^(−1) at 275℃.This outstanding performance is attributed to the synergistic effects of the one-dimensional nanowire structure,deep-level defects,the localized surface plasmon resonance effects induced by embedded Pt nanoparticles,and localized Schottky junctions at the Pt/diamond interface,which enhance optical absorption,carrier generation,and separation *** results highlight the significant potential of Pt nanoparticles-embedded DNWs for advanced deep ultraviolet detection in harsh environments,including aerospace,industrial monitoring,and other applications.

关键词： Diamond Nanowire High temperature UV photodetector Microwave plasma chemical vapor deposition

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Interaction Quantification of MTDC Systems Connected with Weak AC Grids

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CSEE Journal of Power and Energy Systems 2024年第5期10卷 2088-2099页

作者： Wanning Zheng Jiabing Hu Li Chai Bing Liu Zixia Sang Engineering Research Center of Metallurgical Automation and Measurement Technology Wuhan University of Science and TechnologyWuhan 430081China State Key Laboratory of Advanced Electromagnetic Engineering and Technology and School of Electrical and Electronic EngineeringHuazhong University of Science and TechnologyWuhan 430074China College of Control Science and Engineering Zhejiang UniversityHangzhou 310027China State Grid Hubei Economic Research Institute Wuhan 430077China

The small-signal stability of multi-terminal high voltage direct current(HVDC)systems has become one of the vital issues in modern power *** among voltage source converters(VSCs)have a significant impact on the stability of the *** paper proposes an interaction quantification method based on the self-/en-stabilizing coefficients of the general N-terminal HVDC system with a weak AC network ***,we derive the explicit formulae of self-/en-stabilizing coefficients for any N-terminal HVDC system,which can quantify the interactions through different paths *** relation between the self-/en-stabilizing coefficients and the poles of the system can be used to evaluate the impact of the interactions on the system stability ***,we employ the obtained formulae to analyze the parameter sensitivity and explain how a parameter affects the stability of the system through different paths of ***,extensive examples are given to demonstrate the effectiveness of the proposed method.

关键词： Interactions multi-terminal HVDC self-/enstabilizing coefficients small-signal stability

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State Estimation of the Self-Balancing Lower Limb Exoskeleton Using Extended Kalman Filter 6

State Estimation of the Self-Balancing Lower Limb Exoskeleto...

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6th International Conference on Robotics, Intelligent Control and Artificial Intelligence, RICAI 2024

作者： Zhu, Yuanpei Chen, Ziqiang Li, Feng Yang, Ming Li, Wentao Peng, Ansi Tian, Dingkui Wu, Xinyu Shenzhen Institute of Advanced Technology Chinese Academy of Sciences University of Chinese Academy of Sciences Shenzhen China Shenzhen Institute of Advanced Technology Chinese Academy of Sciences Shenzhen China University of Science and Technology of China Shenzhen Institute of Advanced Technology Chinese Academy of Sciences Hefei China Southern University of Science and Technology Shenzhen Institute of Advanced Technology Chinese Academy of Sciences Shenzhen China

ISBN: (纸本)9798331541699

The safe operation of self-balancing lower limb exoskeletons heavily depends on real-time and precise monitoring of essential state variables, including position, velocity, and posture, necessitating the development of more refined and efficient measurement update techniques. This paper delves into the realm of state estimation strategies, leveraging the Extended Kalman Filter (EKF) algorithm. By integrating diverse information sources like inertial measurement units (IMUs), joint encoders, and planned bipedal trajectory, it successfully accomplishes precise estimation of the exoskeleton’s torso and foot states within the global coordinate system. The EKF-based state estimation algorithm introduced in this paper notably enhances the overall state estimation’s accuracy and robustness by effectively mitigating the accumulation and propagation of IMU measurement errors at the exoskeleton’s torso. This advancement establishes a robust foundation for stable and precise control of self-balancing exoskeleton robots. Simulation experiments have further substantiated the high-precision capabilities of the proposed exoskeleton state estimation method. © 2024 IEEE.

关键词： Extended Kalman filters

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A Gas Source Localization Method for Cooperative Robots Based on Bio-inspired Algorithm 7th

A Gas Source Localization Method for Cooperative Robots Bas...

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7th Chinese Conference on Swarm Intelligence and Cooperative Control, CCSICC 2023

作者： Guo, NanLin Advanced Research Institute of Multidisciplinary Science Beijing Institute of Technology Beijing China

ISBN: (纸本)9789819733316

The bio-inspired gas source localization algorithm simulates the forward strategies of various organisms in gas environments, imitating the behaviors and interactions of living creatures in nature to achieve gas source localization. By combining cluster coordinated control, the algorithm leverages strengths and avoids weaknesses, achieving a gas source localization method with low computational costs, high efficiency, and high success rates. This paper proposes a multi-robot cooperative bio-inspired gas source localization method based on the simple Braitenberg strategy. Firstly, a typical maximum coverage problem is introduced from operations research to optimize the gas discovery efficiency in the gas source localization process. Secondly, a multi-robot cooperative algorithm based on the Braitenberg strategy is designed to improve the efficiency of gas source tracking. Finally, a trajectory planning method for multiple mobile robots based on dynamic priority is utilized to avoid collisions. Resulting in a low-cost, efficient, and safe multi-robot cooperative bio-inspired gas source localization. © The Author(s), under exclusive license to Springer Nature Singapore Pte Ltd. 2024.

关键词： Operations research

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TCL-Net: A Lightweight and Efficient Dehazing Network with Frequency-Domain Fusion and Multi-Angle Attention 17th

TCL-Net: A Lightweight and Efficient Dehazing Network with...

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17th Asian Conference on Computer Vision, ACCV 2024

作者： Tang, Cheng Lou, Wenqi University of Science and Technology of China Hefei China Suzhou Institute for Advanced Research University of Science and Technology of China Suzhou China

ISBN: (纸本)9789819609109

Hazy images present a challenging ill-posed problem, suffering from information loss and color distortion. Current deep learning-based dehazing methods enhance performance by increasing network depth but incur substantial parameter overhead. Meanwhile, standard convolutional layers concentrate on low-frequency details, often overlooking high-frequency information, which hinders the effective utilization of prior information presented in blurred images. In this paper, we propose TCL-Net, a lightweight dehazing network which emphasizes on frequency-domain features. Our network first includes a sophisticated layer for extracting high-frequency and low-frequency information, specifically designed using Fast Vision Transformers for the original blurred images. Concurrently, we have designed a frequency-domain information fusion module that integrates high-frequency and low-frequency information with the characteristics of convolutional networks for subsequent convolutional layers. Furthermore, to better leverage spatial information of the original image, we introduce a multi-angle attention module. With the aforementioned design, our network achieves superior performance with a total parameter size of only 0.48 MB, representing an order of magnitude reduction in parameters compared to other state-of-the-art lightweight networks. © The Author(s), under exclusive license to Springer Nature Singapore Pte Ltd. 2025.

关键词： Demulsification

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