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arXiv 2025年

作者： Yoon, Donghyun Jeong, Minwoo Lee, Jinyong Kim, Seyun Yoon, Yoonjin Graduate School of Artificial Intelligence Korea Advanced Institute of Science and Technology Daejeon34141 Korea Republic of Graduate School of Data Science Korea Advanced Institute of Science and Technology Daejeon34141 Korea Republic of Graduate School of Innovation and Technology Management Korea Advanced Institute of Science and Technology Daejeon34141 Korea Republic of Department of Civil and Environmental Engineering Korea Advanced Institute of Science and Technology Daejeon34141 Korea Republic of

This study focuses on identifying suitable locations for highway-transfer Vertiports to integrate Urban Air Mobility (UAM) with existing highway infrastructure. UAM offers an effective solution for enhancing transportation accessibility in the Seoul Metropolitan Area, where conventional transportation often struggle to connect suburban employment zones such as industrial parks. By integrating UAM with ground transportation at highway facilities, an efficient connectivity solution can be achieved for regions with limited transportation options. Our proposed methodology for determining the suitable Vertiport locations utilizes data such as geographic information, origin-destination volume, and travel time. Vertiport candidates are evaluated and selected based on criteria including location desirability, combined transportation accessibility and transportation demand. Applying this methodology to the Seoul metropolitan area, we identify 56 suitable Vertiport locations out of 148 candidates. The proposed methodology offers a strategic approach for the selection of highway-transfer Vertiport locations, enhancing UAM integration with existing transportation systems. Our study provides valuable insights for urban planners and policymakers, with recommendations for future research to include real-time environmental data and to explore the impact of Mobility-as-a-Service on UAM operations. Copyright © 2025, The Authors. All rights reserved.

关键词： Travel time

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Direct and green repairing of degraded LiCoO2 for reuse in lithium-ion batteries

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National science Review 2022年第8期9卷 127-137页

作者： Junxiong Wang Qi Zhang Jinzhi Sheng Zheng Liang Jun Ma Yuanmao Chen Guangmin Zhou Hui-Ming Cheng Shenzhen Geim Graphene Center Tsinghua-Berkeley Shenzhen Institute&Tsinghua Shenzhen International Graduate SchoolTsinghua University Frontiers Science Center for Transformative Molecules School of Chemistry and Chemical EngineeringShanghai Jiao Tong University Faculty of Materials Science and Engineering/Institute of Technology for Carbon Neutrality Shenzhen Institute of Advanced TechnologyChinese Academy of Sciences

Traditional recycling processes of LiCoO2rely on destructive decomposition, requiring high-temperature roasting or acid leaching to extract valuable Li and Co, which have significant environmental and economic concerns. Herein, a direct repairing method for degraded LiCoO2using a LiCl–CH4N2O deep eutectic solvent（DES） was established. The DES is not used to dissolve LiCoO2but directly serves as a carrier for the selective replenishment of lithium and cobalt. Replenishment of lithium restores LiCoO2at different states of charge to a capacity of 130 m Ah/g（at 0.1 C rate）, while replenishing the cobalt increases the capacity retention rate of 90% after 100 cycles, which is comparable to pristine LiCoO2. The DES is collected and reused multiple times with a high repair efficiency. This process reduces energy consumption by 37.1% and greenhouse gas emissions by 34.8% compared with the current production process of LiCoO2, demonstrating excellent environmental and economic viability.

关键词： spent cathodes lithium-ion batteries LiCoO2 direct repair deep eutectic solvent lattice distortion

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ZnCrXFe2-XO4 (X = 0–2) porous powder prepared through self-combustion glycine nitrate process and applied to methyl alcohol steam reforming for production of pure hydrogen

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International Journal of Hydrogen Energy 2024年第PartD期49卷 724-735页

作者： Wu, Ti-Hsuan Yu, Chung-Lun Chen, Jui-Hung Huang, Jhong-Ren Sakthinathan, Subramanian Kameoka, Satoshi Chiu, Te-Wei Lin, Chia-Cheng Fan, Liangdong Lee, Yi-Hsuan Chen, Po-Chou Department of Materials and Mineral Resources Engineering National Taipei University of Technology Taipei10608 Taiwan Institute of Materials Science and Engineering National Taipei University of Technology Taipei10608 Taiwan Department of Chemical Engineering National Taiwan University of Science and Technology Taipei10607 Taiwan Institute of Multidisciplinary Research for Advanced Materials Tohoku University Sendai980-8577 Japan Department of New Energy Science and Technology College of Chemistry and Environmental Engineering Shenzhen University Shenzhen518060 China Department of Mechanical Engineering National Taipei University of Technology Taipei10608 Taiwan Graduate Institute of Organic and Polymeric Materials National Taipei University of Technology Taipei10608 Taiwan E-Current Co. Ltd. Taipei10533 Taiwan

Climate change, global warming, and energy crisis have become an important problem due to the environmental impact of fossil fuels. Hence, alternate energy source is needed for environmental remediation. One such source could be hydrogen (H2). H2 is used as an alternate energy carrier due to it is non-toxic, clean, and efficient. Steam reforming of methyl alcohol (or) methanol (SRM) is a widely available and low-cost hydrogen production method. In this stream-reforming process, mostly commercial zinc-supported catalyst is used, these have some economic defect. Therefore, we need to find alternate suitable catalysts for the SRM process. In this study, ZnCrXFe2-XO4 (X = 0–2) porous catalyst powders of different ratios were synthesized by the glycine nitrate process (GNP) for hydrogen production by SRM. The specific surface areas of the ZnCrXFe2-XO4 powders ranged from 15.75 m2/g to 45.16 m2/g. The ZnCr0.4Fe1.6O4 powder had the highest H2 production without activation, reaching 6850.33 ml STP min−1 g-cat−1 at a reaction temperature of 450 °C. ZnCr0.4Fe1.6O4 porous powders prepared using the GNP method have simple, rapid process steps, low cost, high catalytic activity, and they can be applied to hydrogen fuel cells or other related catalysis applications in the future. The pure hydrogen production performance of these ZnCrXFe2-XO4 catalysts could be of great importance in industry and economic impact. © 2023 Hydrogen Energy Publications LLC

关键词： Amino acids

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DIGITAL COACHING MOTIVATING TOWARDS PHYSICAL ACTIVITY IN JAPAN DURING THE COVID-19 PANDEMIC 36

DIGITAL COACHING MOTIVATING TOWARDS PHYSICAL ACTIVITY IN JAP...

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36th Bled eConference, BLED 2023

作者： Kettunen, Eeva Jokinen, Kristiina Venture, Gentiane Critchley, Will Frank, Lauri University of Jyvaskyla Faculty of Information Technology Jyvaskyla Finland National Institute of Advanced Industrial Science and Technology Tokyo Japan University of Tokyo Graduate School of Engineering Tokyo Japan Jyvaskyla Finland

ISBN: (纸本)9789612867515

COVID-19 influenced peoples lives enormously and its impact was also seen in physical activity and exercising. This mixed methods intervention study highlights some of the impact the pandemic had on the physical activity and exercising behaviors of 10 Japanese information systems employees and students. This study also focuses on the influence that using sport and wellness technology digital coaching had on peoples’ physical activity, exercise motivation and exercise self-efficacy during the pandemic. Based on the findings digital coaching can have motivational elements to support people towards a more physically active lifestyle for example by making users more aware of their own physical activity. However, digital coaching is not enough if users do not have initial motivation which may be understandable in the challenging times of the COVID-19 pandemic. The findings highlight that digital coaching could be further developed to better support its users. This study and the results bring insight for digital coaching developers and users as well as people working in health care field. © University of Maribor, University Press.

关键词： COVID-19

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High-efficiency 0.3 nm narrow spectral width Fe:ZnSe laser with output power of 32.9 W

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Optics Express 2025年第10期33卷 21142-21151页

作者： Zhang, Song Wei, Xingbin Wu, Yingchen Zhou, Sikun Zhou, Rui Ren, Huaijin Wang, Weimin Tang, Chun Ye, Xianlin Institute of Applied Electronics CAEP Sichuan Mianyang621900 China The Graduate School of China Academy of Engineering Physics Beijing100193 China National Key Laboratory of Science and Technology on Advanced Laser and High Power Microwave Sichuan Mianyang621900 China Jonhon Optronic Technology Co. Ltd Henan Luoyang471003 China

We report on a widely tunable Fe:ZnSe laser pumped by Er:YSGG laser operating in the spectral range from 3.9 μm to 4.6 μm, with a narrow spectral width of 0.3 nm by using intracavity prisms and Fabry-Perot (F-P) etalons. Theoretical model describing the wavelength- dependent dynamic process of Fe:ZnSe laser was demonstrated, the highest average power of 32.9 W was obtained at 4.39 μm corresponding to an optical-to-optical efficiency of 28% and a slope efficiency of 34%, with the beam quality factor M2x of 1.57 and M2y of 1.52. © 2025 Optica Publishing Group under the terms of the Optica Open Access Publishing Agreement.

关键词： Optical pumping

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Deep-learning enabled atomic insights into the phase transitions and nanodomain topology of lead-free(K,Na)NbO_(3) ferroelectrics

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science China Materials 2024年第9期67卷 3029-3038页

作者： Xu Zhang Bei Li Ji Zou Hanxing Liu Ben Xu Kai Liu School of Materials Science and Engineering Research Center for Materials Genome EngineeringWuhan University of TechnologyWuhan430070China State Key Laboratory of Advanced Technology for Materials Synthesis and Processing Wuhan University of TechnologyWuhan430070China International School of Materials Science and Engineering Wuhan University of TechnologyWuhan430070China Graduate School China Academy of Engineering PhysicsBeijing100193China

Lead-free K_(x)Na_(1-x)NbO_(3)(KNN)perovskites have garnered increasing attention due to their exceptional ferropiezoelectric properties,which are effectively tuned via polymorphic structures and domain ***,atomic insights into the underlying nanomechanisms governing the ferroelectricity of KNNs amidst varying factors such as composition,phase,and domain are still ***,we perform molecular dynamics simulations of phase transitions and domain dynamics for KNNs with various K/Na ratios(x=0.25∼1.0)by using ab-initio accuracy deep learning potential(DP).As a demonstration of its transferability,the newly developed DP model shows quantum accuracy in terms of the equation of states,elastic constants,and phonon dispersion relations for various KNbO_(3)and K_(0.5)Na_(0.5)NbO_(3).Furthermore,intricate temperature-dependent phase transitions and domain formation of KNNs are extensively and quantitatively *** indicate that for KNNs with compositions x ranging from 0.25 to 1.0,the paraelectric-to-ferroelectric phase transition of KNNs is driven primarily by the order-disorder effect,while the displacive effect is dominant in the subsequent ferroelectric phase ***,flux-closure or herringbone-like nanodomain patterns arranged with 90°domain walls formed close to the experimental *** analyses reveal that favorable 90°domain wall formation becomes more challenging with increasing Na content due to distinct oxygen octahedron distortion arising from the different ionic radii of K/Na *** is envisioned that the combination of unified DP and atomistic simulations will help offer a robust solution for more accurate and efficient in silico explorations of complex structural,thermodynamic,and ferroelectric properties for relevant energy storage and conversion materials.

关键词： KNN molecular dynamics deep potential phase transitions domain dynamics

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Sparse section imaging-based deep learning electron tomography of porous carbon supports in proton exchange membrane fuel cells

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Journal of Energy Chemistry 2025年第5期104卷 795-806页

作者： Sang-Hyeok Yang Yerin Jeon Min-Hyoung Jung Sungyong Cho Eun-Byeol Park Daehee Yang Hyo June Lee Yun Sik Kang Chang Hyun Lee Sung-Dae Yim Hu Young Jeong Sungchul Lee Young-Min Kim Department of Energy Science Sungkyunkwan University(SKKU)Suwon 16419Republic of Korea Advanced Fuel Cell Technology Development Team 2 Hyundai Motor CompanyUiwang 16082Republic of Korea Fuel Cell Laboratory Korea Institute of Energy Research(KIER)Daejeon 34129Republic of Korea Energy Engineering Department College of EngineeringDankook UniversityCheonan 31116Republic of Korea Graduate School of Semiconductor Materials and Devices Engineering Ulsan National Institute of Science and Technology(UNIST)Ulsan 44919Republic of Korea Center for 2D Quantum Heterostructures Institute for Basic Science(IBS)Suwon 16419Republic of Korea

Understanding the degradation phenomenon of proton exchange membrane fuel cells under electrochemical cycling requires an analysis of the porous carbon support *** factors contributing to this phenomenon include changes in the total porosity and viable surface area for electrochemical *** tomography-based serial section imaging using focused ion beam-scanning electron microscopy(FIB-SEM)can elucidate this phenomenon at a nanoscale ***,this highresolution tomographic analysis requires a huge image dataset and manual inputs in rule-based workflows;these requirements are time-consuming and often cause experimental difficulties and unreliable *** propose a deep learning-empowered approach comprising a two-step automated process for image interpolation and semantic segmentation to address the practical issues encountered in FIB-SEM electron *** optimally trained interpolation model can reduce the image data requirement by more than 95%to analyze the structural degradation of carbon supports after electrochemical cycling while maintaining the reliability obtained in conventional tomographic analysis with several hundred *** the subsequent image segmentation model excludes a complicated manual filtering process,the relevant structural parameters can be reliably measured without human *** sparse-section imaging-based deep learning process can allow cost-efficient analysis and reliable measurement of the degree of cycling-induced carbon corrosion.

关键词： Deep learning FIB-SEM Electron tomography Fuel cell Membrane electrode assembly Carbon support

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Multifunction integration within magnetic CNT-bridged MXene/CoNi based phase change materials

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escience 2024年第6期4卷 108-117页

作者： Yan Gao Xiao Chen Xu Jin Chenjun Zhang Xi Zhang Xiaodan Liu Yinhui Li Yang Li Jinjie Lin Hongyi Gao Ge Wang Beijing Advanced Innovation Center for Materials Genome Engineering Beijing Key Laboratory of Function Materials for Molecule&Structure ConstructionSchool of Materials Science and EngineeringUniversity of Science and Technology BeijingBeijing 100083China School of Physics and Astronomy Beijing Normal UniversityBeijing 100875China Research Institute of Petroleum Exploration&Development PetroChinaBeijing 100083China Micro-Nano System Research Center College of Information and Optical EngineeringTaiyuan University of TechnologyTaiyuanShanxi 030024China Shunde Graduate School University of Science and Technology BeijingShunde 528399China

Developing advanced nanocomposite phase change materials(PCMs)integrating zero-energy thermal management,microwave absorption,photothermal therapy and electrical signal detection can promote the leapfrog development of flexible wearable electronic *** this goal,we propose a multidimensional collaborative strategy combining two-dimensional(2D)MXene nanosheets with metal-organic framework-derived onedimensional(1D)carbon nanotubes(CNTs)and zero-dimensional(0D)metal *** encapsulating paraffin wax(PW)in three-dimensional(3D)networked multidimensional MXene/CoNi-C,the resulting composite PCMs exhibit excellent thermal energy storage capacity and long-term thermally reliable *** from the synergistically enhanced photothermal effects of CNTs,Co/Ni nanoparticles and MXene,PW@MXene/CoNi-C can capture photons efficiently and transfer phonons quickly,yielding an ultrahigh photothermal conversion and storage efficiency of 97.5%.Additionally,PW@MXene/CoNi-C composite PCMs exhibit high microwave absorption with a minimum reflection loss of -49.3 dB at 8.03 GHz in heat-related electronic application *** attractively,the corresponding flexible phase change film can simultaneously achieve thermal management and electromagnetic shielding of electronic devices,as well as photothermal therapy and electrical signal detection for *** functional integration design provides an important reference for developing advanced flexible multifunctional wearable materials and devices.

关键词： Phase change materials Metal-organic frameworks Two-dimensional MXene Photothermal conversion Thermal energy storage Microwave absorption

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Real-time 3D Map Update at Point-level for LiDAR-based Localization in Changing Environments

Real-time 3D Map Update at Point-level for LiDAR-based Local...

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IEEE/SICE International Symposium on System Integration

作者： Yuhei Oshikubo Sarthak Pathak Yonghoon Ji Kazunori Umeda Precision Engineering Course Graduate School of Science and Engineering Chuo University Tokyo Japan Department of Precision Mechanics Faculty of Science and Engineering Chuo University Tokyo Japan Graduate School for Advanced Science and Technology Japan Advanced Institute of Science and Technology Nomi-shi Japan

ISBN: (数字)9798331531614

ISBN: (纸本)9798331531621

In this paper, a novel framework for real-time localization through pre-built map update by 3D LiDAR mounted on a robot is proposed. Autonomous mobile robots usually use high-precision 3D maps (i.e., HD maps) built in advance. However, as time passes, the environmental map changes from the actual environment, adversely affecting autonomous navigation. In addition, it is costly to recreate an HD map every time the environment changes. Therefore, it is necessary to update environmental maps simply and frequently. We propose a method for real-time map updating in the form of point clouds and validate the results of integrating map update with localization.

关键词： Point cloud compression Location awareness Three-dimensional displays Laser radar System integration Real-time systems Reliability Mobile robots Autonomous robots

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Development of BiFeO3-based multiferroic thin films with large saturation magnetization and perpendicular magnetic anisotropy-The effect of the Co substitution against Fe on magnetic properties-

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Journal of the Magnetics Society of Japan 2022年第3期46卷 64-69页

作者： Ozeki, T. Yamamoto, D. Egawa, G. Yoshimura, S. Department of Materials Science Graduate School of Engineering Science Akita University 1-1 TegataGakuen-machi Akita Akita010-8502 Japan Research Center of Advanced Materials for Breakthrough Technology Graduate School of Engineering Science Akita University 1-1 TegataGakuen-machi Akita Akita010-8502 Japan

High saturation magnetization and perpendicular magnetic anisotropy are required for ferromagnetic / ferroelectric thin films to apply magnetic recording such as magnetic writing elements of magnetic wire memory, which is a next-generation device with very high recording density. To realize the magnetic properties, substitution of Co against Fe in (Bi1-xBax)FeO3 and (Bi1-xLax)FeO3 thin films were investigated. In the (Bi,Ba)(Fe,Co)O3 thin films, both Ba and Co substitution up to several tens at% had contribution to increase the saturation magnetization. The high saturation magnetization was obtained in (Bi,Ba)(Fe,Co)O3 thin films with the total composition of Ba and Co of around 60 at%. Further increment of Ba and Co substitution decreased the saturation magnetization because the formation of the BiFeO3 phase is hindered by an excess amount of Ba and Co with larger ion radius than Bi and Fe. Co substitution up to 20 at% had contribution to increase the perpendicular magnetic anisotropy. In the (Bi,La)(Fe,Co)O3 thin films, the effect of La substitution was not large to increase the saturation magnetization and perpendicular magnetic anisotropy, however the effect of Co substitution up to 30 at% was large to increase the saturation magnetization and perpendicular magnetic anisotropy. © 2022, Magnetics Society of Japan. All rights reserved.

关键词： Thin films

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