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SSRN 2023年

作者： Bhalothia, Dinesh Liu, Hsiao-Yun Chen, Shih-Hsuan Tseng, Yao-Tien Li, Wenbo Dai, Sheng Wang, Kuan-Wen Chen, Tsan-Yao Department of Engineering and System Science National Tsing Hua University Hsinchu30013 Taiwan Institute of Materials Science and Engineering National Central University Taoyuan City32001 Taiwan Key Laboratory for Advanced Materials and Feringa Nobel Prize Scientist Joint Research Centre School of Chemistry and Molecular Engineering East China University of Science & Technology Shanghai200237 China Research Centre National Cheng Kung University Tainan70101 Taiwan

Electrochemical CO1 reduction (ECR) is a potential route for establishing a carbon-neutral economy. Despite notable breakthroughs, designing a catalytic system with desired product selectivity remains a formidable challenge. Herein, we demonstrate a novel nanoarchitecture comprising sub-nanometer In1O3 clusters on Ag nanoparticles (henceforth denoted as Ag1-In8/C ) for highly selective formate (HCOOH) production in ECR. As-prepared Ag1-In8/C NC with the Ag/In atomic ratio of 2/8 achieved the formate faradaic efficiency (FEHCOOH) of as high as 95.5% at -0.9 VRHE with no obvious degradation after 7 h, surpassing the monometallic counterparts (Ag/C and In1O3/C) in selectivity and activity. The in-situ X-ray absorption spectroscopy reveals the formation of sub-nanometer In1O clusters (i.e. Indium changed its phase from In1O3 to In1O) on Ag nanoparticles under potential-driven conditions, where the high activity and selectivity of Ag1-In8/C NC originates from the robust synergistic cooperation between Ag and In1O domains at the Ag-In1O interface, underscoring its role as the active site for highly selective ECR. Moreover, an amalgamation of the physical and electrochemical analysis suggests that In1O clusters assist *OCHO formation on the surface of Ag1-In8/C NC during ECR and thus pronounced formate selectivity is achieved. In light of our findings, this study promises to unravel intricate mechanistic insights, thus paving the way for the rational design of exceptionally selective catalysts for ECR. © 2023, The Authors. All rights reserved.

关键词： Efficiency

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Kinematic, Workspace and Force Analysis of a five-DOF Hybrid Manipulator R(2RPR)R/SP+RR

Research Square

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Research Square 2021年

作者： Xu, Yundou Yang, Fan Mei, Youen Zhang, Dongsheng Zhou, Yulin Zhao, Yongsheng Laboratory of Parallel Robot and Mechatronic System of Hebei Province Yanshan University Qinhuangdao066004 China Key Laboratory of Advanced Forging & Stamping Technology Science of Ministry of National Education Yanshan University Qinhuangdao006004 China School of Mechanical Engineering Yanshan University Qinhuangdao066004 China Tencent Robotics X Tencent Holdings Shenzhen518057 China

In the present study, the over-constrained hybrid manipulator R(2RPR)R/SP+RR is considered as the research objective. In this paper, kinematics of the hybrid manipulator, including the forward and inverse position, are analyzed. Then, the workspace is checked based on the inverse position solution to evaluate whether the workspace of the hybrid manipulator meets the requirements, and the actual workspace of the hybrid robot is analyzed. After that, the force analysis of the over-constrained parallel mechanism is carried out, and an ADAMS-ANSYS rigid-flexible hybrid body model is established to verify the simulation. Based on the obtained results from the force analysis, the manipulator structure is design. Then, the structure optimization is carried out to improve the robot stiffness. Finally, calibration and workspace verification experiments are performed on the prototype, cutting experiment of an S-shaped aluminum alloy workpiece is completed, and the experiment verifies the processing ability of the prototype and proves that the prototype has good application prospects. © 2021, CC BY.

关键词： Kinematics

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Yolk–shell vanadium pentoxide integrated electrode for high-performance stretchable lithium metal battery

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Journal of Energy Storage 2024年 98卷

作者： Nathan, Muthu Gnana Theresa Yeon, Seon-Young Lee, Jae Seob Jo, Min Su Hwang, Gil Chan Kim, Hong-Il Wu, Fanglin Kim, Guk-Tae Liu, Ying Kim, Jin-Hee Cho, Jung Sang Kim, Jae-Kwang Department of Energy Convergence Engineering Cheongju University 258 Daeseong-ro Chungbuk Cheongju28503 Korea Republic of Department of Engineering Chemistry Chungbuk National University Chungbuk 28644 Korea Republic of Department of Earth System Sciences Yonsei University Seoul03722 Korea Republic of State Key Laboratory of Advanced Technology for Materials Synthesis and Processing Wuhan University of Technology Wuhan430070 China Department of Biomedical Laboratory Science College of Health Science Cheongju University Chungbuk Cheongju28503 Korea Republic of Biomedical Research Institute Chungbuk National University Hospital Chungbuk 361-763 28644 Korea Republic of

Vanadium pentoxide (V2O5) stands out as a preferred cathode material for stretchable lithium-ion batteries due to its high specific capacity, robust structural stability, cost-effectiveness, and ease of synthesis. However, its practical application is limited by a low Li+ diffusion coefficient (10−12–10−13 cm2 s−1) and poor electrical conductivity. To address these challenges, we have developed an innovative yolk-shell V2O5 architecture using a facile synthesis method involving spray pyrolysis followed by thermal treatment. This yolk-shell V2O5 is coated with a poly(ethylene oxide) (PEO) electrolyte to enhance ion transport contact areas and flexibility. The yolk-shell V2O5@PEO is then integrated with a PEO-based polymer electrolyte in a thin film configuration, paired with zig-zag truncated lithium metal anodes for stretchable lithium metal batteries. The integrated film demonstrates superior electrochemical performance due to highly reversible Li+ insertion/extraction and enhanced Li ion diffusion. The unique design of the stretchable Li-yolk-shell V2O5@PEO battery achieves an excellent specific discharge capacity of 261 mAh g−1, compared to 158 mAh g−1 for pure V2O5 at 0.1C. Additionally, the stretchable Li-yolk-shell V2O5@PEO cell exhibits a discharge capacity of 250 mAh g−1 under zero-strain conditions and 233.7 mAh g−1 under 40 % strain at 0.1C and 40 °C. Characterization through X-ray diffraction (XRD) and scanning electron microscopy (SEM) confirms the nano-sized morphology and high crystallinity of the yolk-shell V2O5. X-ray photoelectron spectroscopy (XPS) analysis reveals the transformation of yolk-shell V2O5@PEO into α-V2O5, Ε-Li0.5V2O5, δ-LiV2O5, and γ-Li2V2O5 phases during lithium-ion (de)intercalation. This cutting-edge battery design paves the way for the development of high-performance, stretchable, and flexible batteries, ideal for next-generation portable electronic devices. © 2024 Elsevier Ltd

关键词： Scanning electron microscopy

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Fault-Tolerant Control of Underwater Tension Leg Platform Based on Sliding Mode Control and Adaptive Disturbance Observer

SSRN

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SSRN 2023年

作者： Hong, Haochen Wu, Hongming Shen, Xiong Wang, Minghui Hu, Chaocheng Xia, Yingkai Xu, Guohua School of Naval Architecture and Ocean Engineering Huazhong University of Science and Technology Wuhan430074 China College of Engineering Huazhong Agricultural University Wuhan430070 China Ship and Ocean Water Power Hubei Key Point Laboratory Huazhong University of Science and Technology Wuhan430074 China National Engineering Laboratory for Test and Experiment Technology of Marine Engineering Equipment Kunming650051 China Kunming Shipborne Equipment Research & Test Center Kunming650051 China Wuhan Second Ship Design and Research Institute Wuhan430205 China

In this article, the fault tolerant control problem of underwater tension leg platforms is addressed by sliding mode control and a novel adaptive disturbance observer, considering external disturbances, system nonlinearities, and actuator faults. To deal with the system’s faults and enhance the system’s robustness, a novel adaptive disturbance observer is proposed, which incorporates an adaptive function based on tracking errors. Additionally, a robust sliding mode controller is introduced that incorporates a novel reaching law to improve the convergence rate and minimize system velocity overshoot, thereby enhancing control performance and system robustness. To ensure the maintenance of the desired platform attitude during normal and emergency situations throughout the floating process, a general platform control law is proposed based on the platform attitude and winch speed. Finally, a hardware-in-the-loop simulation is conducted to evaluate the performance of the proposed controller under various disturbances and faults. The simulation results validate the robustness and superiority of the proposed approach. © 2023, The Authors. All rights reserved.

关键词： Sliding mode control

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Approaching three-dimensional quantum Hall effect in bulk HfTe5

arXiv

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arXiv 2020年

作者： Wang, Pang Ren, Yafei Tang, Fangdong Wang, Peipei Hou, Tao Zeng, Hualing Zhang, Liyuan Qiao, Zhenhua International Center for Quantum Design of Functional Materials Hefei National Laboratory for Physical Sciences at the Microscale Synergetic Innovation Centre of Quantum Information and Quantum Physics CAS Key Laboratory of Strongly Coupled Quantum Matter Physics Department of Physics University of Science and Technology of China Hefei China Department of Physics Southern University of Science and Technology Shenzhen Institute for Quantum Science and Engineering Shenzhen518055 China Solid State Nanophysics Max Plank Institute for Solid State Research Stuttgart Germany

The discovery of quantum Hall effect in two-dimensional (2D) electronic systems inspired the topological classifications of electronic systems1,2. By stacking 2D quantum Hall effects with interlayer coupling much weaker than the Landau level spacing, quasi-2D quantum Hall effects have been experimentally observed3~7, due to the similar physical origin of the 2D counterpart. Recently, in a real 3D electronic gas system where the interlayer coupling is much stronger than the Landau level spacing, 3D quantum Hall effect has been observed in ZrTe58. In this Letter, we report the electronic transport features of its sister bulk material, i.e., HfTe5, under external magnetic field. We observe a series of plateaus in Hall resistance ρxy as magnetic field increases until it reaches the quantum limit at 1~2 Tesla. At the plateau regions, the longitudinal resistance ρxx exhibits local minima. Although ρxx is still nonzero, its value becomes much smaller than ρxy at the last few plateaus. By mapping the Fermi surface via measuring the Shubonikov-de Haas oscillation, we find that the strength of Hall plateau is proportional to the Fermi wavelength, suggesting that its formation may be attributed to the gap opening from the interaction driven Fermi surface instability. By comparing the bulk band structures of ZrTe5 and HfTe5, we find that there exists an extra pocket near the Fermi level of HfTe5, which may lead to the finite but nonzero longitudinal conductance. Copyright © 2020, The Authors. All rights reserved.

关键词： Tellurium compounds

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Liquid Metal Manifold Microchannel Heat Sink for Ultra-High Heat Flux Cooling

SSRN

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SSRN 2024年

作者： Zhang, Mingkuan Gao, Qi Zhao, Zhiyuan Guo, Luna Li, Xuan Zhang, Chao Zhang, Xudong Rao, Wei Tianjin Key Laboratory for Advanced Mechatronic System Design and Intelligent Control School of Mechanical Engineering Tianjin University of Technology Tianjin300384 China National Demonstration Center for Experimental Mechanical and Electrical Engineering Education Tianjin University of Technology China School of mechanical engineering Tianjin University of Commerce Tianjin300134 China Institute of Refrigeration and Cryogenics Shanghai Jiao Tong University Shanghai200240 China Key Laboratory for Thermal Science and Power Engineering of Ministry of Education Department of Engineering Mechanics Tsinghua University Beijing Beijing100084 China CAS Key Laboratory of Cryogenics Technical Institute of Physics and Chemistry Chinese Academy of Sciences China Beijing Key Lab of CryoBiomedical Engineering and Key Lab of Cryogenics Beijing100190 China

The reduction in transistor dimensions and advancements in chip integration have led to a dramatic increase in the heat flux of chip. Advanced heat dissipation technology has become the pivotal in ensuring the normal operation of chips and fully utilizing chip performance. Room temperature liquid metal convection cooling technology has demonstrated its efficacy as a viable approach for addressing high heat flux heat dissipation. However, the smaller specific heat capacity of liquid metal leads to a large temperature rise, imposing a constraint on the progression of liquid metal cooling technology. To overcome this drawback, this paper proposed a liquid metal manifold channel structure designed to convert the continuous long-range flow into a segmented short-range flow. The good matching between liquid metal and manifold structures is adequately demonstrated through a comparison with alternative coolant and channel structure. The simulation results demonstrate the effectiveness of liquid metal manifold channel cooling in dealing with a heat flux of 1000 W/cm², ensuring that the maximum temperature of the chip remains below 351.7 K. Moreover, the convective heat transfer coefficient even reaches 106 W/(m2·K), which is ten times larger than that of water conventional microchannel heat sink. The orthogonal experiments were conducted to analyze how the structural parameters affect the dissipation performance, including the height of the microchannel, ratio of manifold length to fin length, length of fin in manifold, width of channel, and ratio of fin with to channel width. It concluded that the height of the microchannel has been identified as the most critical factor. This manifold structure mitigates the inherent limitation of the lower specific heat capacity of liquid metal, paving the way for effective thermal management of electronic devices subjected to ultra-high heat flux. © 2024, The Authors. All rights reserved.

关键词： Heat flux

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Research on Manipulation Strategy of Quad Tilt-Rotor

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Transactions of Nanjing University of Aeronautics and Astronautics 2020年第S01期37卷 1-8页

作者： WANG Zhigang LYU Zhichao LI Jianbo Yangzhou Collaborative Innovation Research Institute Shenyang Aircraft Design&Research InstituteYangzhou 225000P.R.China National Key Laboratory of Science and Technology on Rotorcraft Aerodynamic College of Aerospace EngineeringNanjing University of Aeronautics and AstronauticsNanjing 210016P.R.China

Aiming at the complex tilting process of quad tilt-rotor(QTR)transition mode,this paper studies the manipulation strategy in transition mode to solve the problem of manipulation redundancy and coupling in transition mode of quad tilt *** variations of the manipulation derivative are analyzed in the tilting *** the flight control simulation and flight test of the quad tilt-rotor,the validity of the control system and the rationality of the manipulation strategy are verified.

关键词： quad tilt-rotor manipulation strategy flight test simulation

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Resolving Spurious Temporal Location Dependency for Video Corpus Moment Retrieval

Resolving Spurious Temporal Location Dependency for Video Co...

引用

IEEE International Conference on systems, Man and Cybernetics

作者： Yishuo Zhang Lanshan Zhang Zhizhen Zhang Ziyi Wang Xiaohui Xie Wendong Wang School of Computer Science (National Pilot Software Engineering School) Beijing University of Posts and Telecommunications Beijing China Beijing Key Laboratory of Network System and Network Culture Beijing University of Posts and Telecommunications Beijing China Shenzhen International Graduate School Tsinghua University Shenzhen China Department of Computer Science and Technology Tsinghua University Beijing China

ISBN: (数字)9781665410205

ISBN: (纸本)9781665410212

Video Corpus Moment Retrieval aims to retrieve the relevant video from a large corpus and localize the corresponding moment within the target video based on a specific query. Existing methods have achieved promising accuracy and efficiency through dedicated model designs. However, we suggest these methods overly exploit dataset biases instead of semantics. This will lead to exaggerated performances on biased datasets and implicit a significant deficiency in generalizability, which is an important metric yet not considered in existing studies. In this paper, we observe the degradation caused by a spurious dependency and design a model to mitigate this harm. Specifically, we generate an Out-Of-Distributed (OOD) test set from a widely used TV Retrieval dataset, revealing the existing models' erroneous dependency on the temporal locations of target moments. Therefore, we utilize a theoretical Structural Causal Model (SCM) to dig into the roots of this dependency by constructing causal paths for the models. Furthermore, we propose a concrete Clip Location Deconfounding Model (CLDM) to disentangle the confounded video features into the content part and the location confounder part, then produce results with causal intervention. Experiments show that CLDM significantly alleviates the impact brought by dataset biases thus providing advanced generalizability among existing works.

关键词： Measurement Degradation TV Accuracy Semantics Cybernetics

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GenFace: A Large-Scale Fine-Grained Face Forgery Benchmark and Cross Appearance-Edge Learning

arXiv

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arXiv 2024年

作者： Zhang, Yaning Yu, Zitong Wang, Tianyi Huang, Xiaobin Shen, Linlin Gao, Zan Ren, Jianfeng Computer Vision Institute College of Computer Science and Software Engineering Shenzhen University Shenzhen518060 China School of Computing and Information Technology Great Bay University Dongguan523000 China National Engineering Laboratory for Big Data System Computing Technology Shenzhen University Shenzhen518060 China Nanyang Technological University 50 Nanyang Ave Block N 4 639798 Singapore Shenzhen Institute of Artificial Intelligence and Robotics for Society Shenzhen518129 China Guangdong Key Laboratory of Intelligent Information Processing Shenzhen University China Jinan250014 China Key Laboratory of Computer Vision and System Ministry of Education Tianjin University of Technology Tianjin300384 China School of Computer Science University of Nottingham Ningbo China

The rapid advancement of photorealistic generators has reached a critical juncture where the discrepancy between authentic and manipulated images is increasingly indistinguishable. Thus, benchmarking and advancing techniques detecting digital manipulation become an urgent issue. Although there have been a number of publicly available face forgery datasets, the forgery faces are mostly generated using GAN-based synthesis technology, which does not involve the most recent technologies like diffusion. The diversity and quality of images generated by diffusion models have been significantly improved and thus a much more challenging face forgery dataset shall be used to evaluate SOTA forgery detection literature. In this paper, we propose a large-scale, diverse, and fine-grained high-fidelity dataset, namely GenFace, to facilitate the advancement of deepfake detection, which contains a large number of forgery faces generated by advanced generators such as the diffusion-based model and more detailed labels about the manipulation approaches and adopted generators. In addition to evaluating SOTA approaches on our benchmark, we design an innovative Cross Appearance-Edge Learning (CAEL) detector to capture multi-grained appearance and edge global representations, and detect discriminative and general forgery traces. Moreover, we devise an Appearance-Edge Cross-Attention (AECA) module to explore the various integrations across two domains. Extensive experiment results and visualizations show that our detection model outperforms the state of the arts on different settings like cross-generator, cross-forgery, and cross-dataset evaluations. Code and datasets will be available at https://***/Jenine-321/GenFace. Copyright © 2024, The Authors. All rights reserved.

关键词： Image enhancement

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Dirac Fermionsin Antiferromagnetic FeSn Kagome Latticeswith Combined Space Inversion and Time ReversalSymmetry

arXiv

引用

arXiv 2019年

作者： Lin, Zhiyong Wang, Chongze Wang, Pengdong Yi, Seho Li, Lin Zhang, Qiang Wang, Yifan Wang, Zhongyi Sun, Yan Sun, Zhe Cho, Jun-Hyung Zeng, Changgan Zhang, Zhenyu Department of Physics International Center for Quantum Design of Functional Materials University of Science and Technology of China Hefei National Laboratory for Physical Sciences at the Microscale Cas Key Laboratory of Strongly Coupled Quantum Matter Physics Synergetic Innovation Center of Quantum Information & Quantum Physics Hefei Anhui 230026 China Research Institute for Natural Science Department of Physics Hanyang University 222 Wangsimni-ro Seongdong-Ku Seoul 04763 Korea Republic of National Synchrotron Radiation Laboratory University of Science and Technology OfChina Hefei Anhui 230029 China Max Planck Institute for Chemical Physics of Solid Dresden Germany

Symmetry principles play a critical role in formulating the fundamental laws of nature1,with a large number of symmetry-protected topological states identified in recent studies of quantum materials2,3. As compelling examples, massless Dirac fermions are jointly protected by the space inversion symmetry Pand time reversal symmetry T supplemented by additional crystalline symmetry4-8, while evolving into Weyl fermions when either Por Tis broken4,***, such massless Dirac fermionsare expected to survive when each of the P and T symmetries is individually broken but the combined PT symmetry is preserved12. To date, this conceptually intriguing prediction remains to be experimentally validated. Here, based on angle-resolved photoemission spectroscopy (ARPES)aided by first-principles calculations, we present the first experimental observation of massless Dirac fermions in a layered FeSn crystal containing antiferro magnetically coupled ferromagnetic Fe kagome layers. In this system, each of the P and T symmetries is individually broken, but the stable Dirac points are protected by the combined PT symmetry with additional on-symmorphic S2zsymmetry. We further demonstrate that by breaking the PT or S2zsymmetry, we can transform the massless Dirac fermions into massless Weyl or massive Dirac fermions. The present study substantially enriches our fundamental understanding of the intricate connections between symmetries and topologies of matter, especially with the spin degree of freedom playing a vital role. Copyright © 2019, The Authors. All rights reserved.

关键词： Tin alloys

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