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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

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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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Necklace-Like Te-Au Reticula Platform with Three Dimensional Hotspots for Surface-Enhanced Raman Scattering (Sers) Sensor for Food Hazards Analysis

SSRN

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SSRN 2023年

作者： Li, Pan Li, Jingya Li, Man Wang, Qianqian Wang, Juan Zhu, Yinbo Bu, Linfeng Zhang, Hanyuan Xu, Weiping Department of Pathology Anhui University of Chinese Medicine Hefei230012 China University of Science and Technology of China Hefei230026 China Department of Bioengineering The First Affiliated Hospital of USTC Division of Life Sciences and Medicine University of Science and Technology of China Anhui Hefei230001 China Department of Pharmacy Anhui University of Chinese Medicine Anhui Hefei230038 China CAS Key Laboratory of Mechanical Behavior and Design of Materials Department of Modern Mechanics CAS Center for Excellence in Complex System Mechanics University of Science and Technology of China Hefei230027 China Center of Medical Physics and Technology Hefei Institutes of Physical Science CAS Hefei230021 China Anhui Provincial Key Laboratory of Tumor Immunotherapy and Nutrition Therapy Anhui Provincial Hospital Anhui Hefei230001 China Gerontology Institute of Anhui Province Hefei230001 China University of Science and Technology of China China

In this work, we combined three-dimensional (3D) necklace-like Te-Au reticula as novel surface-enhanced Raman scattering (SERS) active substrates with oxidation-reduction displacement reactions to construct a molecular machine for SERS detection. The structurally tunable 3D necklace-like spatial structures generated more active ‘hot spots’ and thus enhanced the sensitivity of SERS signals. Besides, layers of ultrathin nanowires showed high sequence dependence which ensure the repeatability and abundant hotspots at interparticle gaps guarantee the high SERS performance of the substrate. A better localized surface plasmon resonance (LSPR) effect of the sensor was verified by finite-difference time-domain (FDTD) analysis in both Raman intensities and electromagnetic field distributions compared to the citrate-stabilized AuNPs and CTAB-protected AuNRs. The proposed strategy can also serve as a universally amplified and sensitive detection platform for monitoring different molecules, thus achieving an amplification detection of 3,3'-diethylthiatricarbocyanine iodide (DTTCI) are 1 nM and R6G with a low limit of detection of 1 pM. Especially, The intensity of the main vibration of R6G from 30 spots of SERS data with excellent reproducibility (relative standard deviation of 6.25%). High selectivity and accuracy of the SERS sensor were proved by practical analysis melamine (MM) in milk with a linear calibration curve (R2=0.9962) and a limit of detection of 0.75 mg/kg. Our research provides a new perspective to construct 3D SERS sensor from integrated structural design. © 2023, The Authors. All rights reserved.

关键词： Substitution reactions

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Two points are enough

arXiv

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arXiv 2024年

作者： Liu, Hao Zhao, Yanbin Zheng, Huarong Fan, Xiulin Deng, Zhihua Chen, Mengchi Wang, Xingkai Liu, Zhiyang Lu, Jianguo Chen, Jian State Key Laboratory of Fluid Power Components and Mechatronic Systems School of Mechanical Engineering Zhejiang University Hangzhou China Ocean College Zhejiang University Hangzhou China State Key Laboratory of Silicon and Advanced Semiconductor Materials School of Materials Science and Engineering Zhejiang University Hangzhou China Nanyang Technological University Singapore School of Control Science and Engineering Zhejiang University Hangzhou China School of Materials Science and Engineering Tianjin University Tianjin China School of System Design and Intelligent Manufacturing Southern University of Science and Technology Shenzhen China

Prognosis and diagnosis play an important role in accelerating the development of lithium-ion batteries, as well as reliable and long-life operation. In this work, we answer an important question: What is the minimum amount of data required to extract features for accurate battery prognosis and diagnosis? Based on the first principle, we successfully extracted the best two-point feature (BTPF) for accurate battery prognosis and diagnosis using the fewest data points (only two) and the simplest feature selection method (Pearson correlation coefficient). The BTPF extraction method is tested on 820 cells from 6 open-source datasets (covering five different chemistry types, seven manufacturers, and three data types). It achieves comparable accuracy to state-of-the-art features in both prognosis and diagnosis tasks. This work challenges the cognition of existing studies on the difficulty of battery prognosis and diagnosis tasks, subverts the fixed pattern of establishing prognosis and diagnosis methods for complex dynamic systems through deliberate feature engineering, highlights the promise of data-driven methods for field battery prognosis and diagnosis applications, and provides a new benchmark for future studies. Copyright © 2024, The Authors. All rights reserved.

关键词： Lithium-ion batteries

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MRPB 1.0: A unified benchmark for the evaluation of mobile robot local planning approaches

arXiv

引用

arXiv 2020年

作者： Wen, Jian Zhang, Xuebo Bi, Qingchen Pan, Zhangchao Feng, Yanghe Yuan, Jing Fang, Yongchun The Institute of Robotics and Automatic Information System College of Artificial Intelligence Nankai University Tianjin300350 China The Tianjin Key Laboratory of Intelligent Robotics Nankai University Tianjin300350 China The School of Marine Science and Technology Northwestern Polytechnical University Xi'an710072 China The Faculty of Robot Science and Engineering Northeastern University Shenyang110000 China The College of Systems Engineering National University of Defense Technology Changsha410073 China

Local planning is one of the key technologies for mobile robots to achieve full autonomy and has been widely investigated. To evaluate mobile robot local planning approaches in a unified and comprehensive way, a mobile robot local planning benchmark called MRPB 1.0 is newly proposed in this paper. The benchmark facilitates both motion planning researchers who want to compare the performance of a new local planner relative to many other state-of-the-art approaches as well as end users in the mobile robotics industry who want to select a local planner that performs best on some problems of interest. We elaborately design various simulation scenarios to challenge the applicability of local planners, including large-scale, partially unknown, and dynamic complex environments. Furthermore, three types of principled evaluation metrics are carefully designed to quantitatively evaluate the performance of local planners, wherein the safety, efficiency, and smoothness of motions are comprehensively considered. We present the application of the proposed benchmark in two popular open-source local planners to show the practicality of the benchmark. In addition, some insights and guidelines about the design and selection of local planners are also provided. The benchmark website [1] contains all data of the designed simulation scenarios, detailed descriptions of these scenarios, and example code. Copyright © 2020, The Authors. All rights reserved.

关键词： Mobile robots

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Recent development of chemically complex metallic glasses: from accelerated compositional design, additive manufacturing to novel applications

引用

Materials Futures 2022年第1期1卷 9-31页

作者： J Y Zhang Z Q Zhou Z B Zhang M H Park Q Yu Z Li J Ma A D Wang H G Huang M Song B S Guo Q Wang Y Yang Department of Mechanical Engineering College of EngineeringCity University of Hong KongKowloon TongKowloonHong KongPeople’s Republic of China Shenzhen Key Laboratory of High Performance Nontraditional Manufacturing College of Mechatronics and Control EngineeringShenzhen UniversityShenzhenGuangdong 518060People’s Republic of China School of Materials Science and Engineering Dongguan University of TechnologyDongguanGuangdong 523808People’s Republic of China Institute of Materials China Academy of Engineering PhysicsJiangyouSichuan 621907People’s Republic of China State Key Laboratory of Powder Metallurgy Central South UniversityChangshaHunan 410083People’s Republic of China Institute of Advanced Wear&Corrosion Resistant and Functional Materials Jinan UniversityGuangzhouGuangdong 510632People’s Republic of China Institute of Materials Laboratory for MicrostructuresShanghai UniversityShanghai 200444People’s Republic of China Department of Materials Science and Engineering College of EngineeringCity University of Hong KongKowloon TongKowloonHong KongPeople’s Republic of China Department of Advanced Design and System Engineering College of EngineeringCity University of Hong KongKowloon TongKowloonHong KongPeople’s Republic of China

Metallic glasses(MGs)or amorphous alloys are an important engineering material that has a history of research of about 80–90 *** different fast cooling methods were developed for multi-component MGs between 1960s and 1980s,1990s witnessed a surge of research interest in the development of bulk metallic glasses(BGMs).Since then,one central theme of research in the metallic-glass community has been compositional design that aims to search for MGs with a better glass forming ability,a larger size and/or more interesting properties,which can hence meet the demands from more important *** this review article,we focus on the recent development of chemically complex MGs,such as high entropy MGs,with new tools that were not available or mature yet until recently,such as the state-of-the-art additive manufacturing technologies,high throughput materials design techniques and the methods for big data analyses(*** learning and artificial intelligence).We also discuss the recent use of MGs in a variety of novel and important applications,from personal healthcare,electric energy transfer to nuclear energy that plays a pivotal role in the battle against global warming.

关键词： metallic glasses amorphous alloys alloy design additive manufacturing machine learning high throughput materials design

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Subgraph Matching with Diversity Handling and Its Applications to PCB Placement

Subgraph Matching with Diversity Handling and Its Applicatio...

引用

Electronics design Automation (ISEDA), International Symposium of

作者： Chuandong Chen Haiming Lin Miaodi Su Huan He Jianli Chen Ziran Zhu College of Physics and Information Engineering Fuzhou University Fuzhou China Fujian Science & Technology Innovation Laboratory for Optoelectronic Information of China Fuzhou China Hangzhou Huawei Enterprises Telecommunication Technologies Co. Ltd Hangzhou China State Key Lab of ASIC & System Fudan University Shanghai China National ASIC System Engineering Center Southeast University Nanjing China

ISBN: (数字)9798350352030

ISBN: (纸本)9798350352047

Printed circuit board (PCB) placement is a critical stage in industrial chip design, which still heavily relies on manual methods, leading to substantial design time consumption. Given the frequent occurrence of similar or identical modules in different PCB designs, the reuse of placements emerges as a promising avenue to enhance the efficiency of PCB placement. In this paper, we propose a sub graph matching based reference placement algorithm to achieve PCB placement reuse, thereby improving placement efficiency. We first take the netlist of the already placed and unplaced circuits as input and abstract them into graphs. Then, we construct and filter candidate spaces based on the characteristics of components and nets. In the process of filtering candidate spaces, we adopt diversity handling that includes cut edges and block nodes to ensure the proposed algorithm can handle inexact matching. Finally, we introduce virtual nodes to construct a matching tree using a combination of depth-first search (DFS) and breadth-first search (BFS), and then perform hierarchical matching based on this matching tree to complete the sub graph matching and obtain the placement results. Experimental results show that in large-scale PCB cases, our algorithm runs much faster than the state-of-the-art works. Particularly, the matching rate of our algorithm is almost 100% for the tested cases.

关键词： Matched filters design automation Filtering Printed circuits Diversity reception DH-HEMTs Manuals

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Delamination of an Elastic Cuboid from a Flat Rigid Substrate

SSRN

引用

SSRN 2023年

作者： Chen, ZiJian Sun, XiaoHao Zhu, YinBo He, ZeZhou Zhao, Yang Wang, Zhengzhi Wu, HengAn Wu, XiaoPing Gu, Ping CAS Key Laboratory of Mechanical Behavior and Design of Materials Department of Modern Mechanics CAS Center for Excellence in Complex System Mechanics University of Science and Technology of China Hefei230027 China Department of Mechanical Engineering University of Colorado Boulder BoulderCO80309 United States Department of Precision Machinery & Precision Instrumentation University of Science and Technology of China Hefei230026 China Department of Engineering Mechanics School of Civil Engineering Wuhan University Hubei Wuhan430072 China

Due to their strong pull-off force on noncooperative objects, dry adhesive materials have promising applications in gecko-mimicking robots and mechanical grippers. Previous experimental studies have shown that uniform interfacial stress and center delamination are favorable for achieving a high pull-off force;however, an in-depth understanding of interfacial stress distribution, delamination mode, and pull-off force of square cross-section elastomers is lacking. The square cross-section is expected to improve the packing ratio and pull-off force further. This paper studies a model system where an elastic square cuboid is detached from a flat rigid substrate to provide theoretical support for the design of adhesive materials. Based on elastomers' energy release rate and instability, we establish a three-dimensional model for the elastic square cuboid and analyze the mechanism of three delamination modes: edge delamination, center delamination, and cavity delamination. Furthermore, a new theoretical model for the pull-off force and phase diagram of the various delamination modes is developed. We found three subdivision crack patterns in the cuboid edge delamination mode, arc-shaped, fingering, and rhombus, which are different from the cylinder sample. Fingering cracks of cylinder samples are usually considered characteristics of elastic instability, but those of cuboid samples cannot be defined as elastic instability. The three edge crack patterns are gradually transformed, determined by the interfacial stress distribution, which is affected by the sample width-to-thickness ratio. The following results are obtained by combining the experimental and theoretical pull-off forces and phase diagram data. First, the interfacial stress distribution determines the pull-off force, and the delamination mode is an index to judge the stress distribution. Second, we propose a novel dry adhesive design strategy that regulates interfacial delamination to achieve controllable pull-of

关键词： Adhesion

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Enhancing Irradiation Resistance in Refractory Medium Entropy Alloys with Simplified Chemistry

arXiv

引用

arXiv 2024年

作者： Tunes, M.A. Parkison, D. Sun, B. Willenshofer, P. Samberger, S. Derby, B.K. Baldwin, J.K.S. Fensin, S.J. Sobieraj, D. Wróbel, J.S. Byggmästar, J. Pogatscher, S. Martinez, E. Nguyen-Manh, D. El-Atwani, O. Chair of Non-Ferrous Metallurgy Montanuniversität Leoben Austria Materials Science and Technology Division Los Alamos National Laboratory United States Department of Nuclear Engineering University of California at Berkeley United States Departments of Mechanical Engineering and Materials Science and Engineering Clemson University United States Center for Integrated Nanotechnologies Los Alamos National Laboratory United States Faculty of Materials Science and Engineering Warsaw University of Technology Poland Department of Physics University of Helsinki Finland Materials Division United Kingdom Atomic Energy Authority Culham Campus Abingdon United Kingdom Department of Materials University of Oxford Parks Road United Kingdom Reactor Materials and Mechanical Design Pacific Northwest National Laboratory United States

Refractory High-Entropy Alloys (RHEAs) hold promising potential to be used as structural materials in future nuclear fusion reactors, where W and its alloys are currently leading candidates. Fusion materials must be able to withstand extreme conditions [1, 2], such as (i) severe radiation-damage arising from highly-energetic neutrons, (ii) embrittlement caused by implantation of H and He ions, and (iii) exposure to extreme high-temperatures and thermal gradients. Recent research demonstrated that two RHEAs - the WTaCrV [3] and WTaCrVHf [4] - can outperform both coarse-grained and nanocrystalline W in terms of its radiation response and microstructural stability [5-8]. Chemical complexity and nanocrystallinity enhance the radiation tolerance of these new RHEAs, but their multi-element nature, including low-melting Cr, complicates bulk fabrication and limits practical applications. Herein, we demonstrate that reducing the number of alloying elements and yet retain high-radiation tolerance is possible within the ternary system W-Ta-V via synthesis of two novel nanocrystalline refractory medium-entropy alloys (RMEAs): the W53Ta44V3 and W53Ta42V5 (in at.%). We experimentally show that the radiation response of the W-Ta-V system can be tailored by small additions of V, and such experimental result was validated with theoretical analysis of chemical short-range orders (CSRO) from combined ab-initio atomistic Monte-Carlo modeling. It is predicted from computational analysis that a small change in V concentration has a significant effect on the Ta-V CRSO between W53Ta44V3 and W53Ta42V5 leading to radiation-resistant microstructures in these RMEAs from chemistry stand-point of views. By returning to terminal solid solutions, we deviate from the original high-entropy alloy concept to show that high radiation resistance can be achieved in systems with simplified chemical complexity, hinting at a new paradigm for the metallurgy of high-entropy and highly-concentrated multi-compo

关键词： Tantalum alloys

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Experimental Study on the Zebra Crossing Behavior of Mixed Bicycles and Pedestrians

SSRN

引用

SSRN 2022年

作者： Ma, Jian Wang, Qiao Chen, Juan Jiang, Rui Song, Weiguo Li, Ruoyu Lian, Liping School of Transportation and Logistics National Engineering Laboratory of Integrated Transportation Big Data Application Technology National United Engineering Laboratory of Integrated and Intelligent Transportation Southwest Jiaotong University Chengdu610031 China Faculty of Geosciences and Environmental Engineering Southwest Jiaotong University Chengdu610031 China Key Laboratory of Transport Industry of Big Data Application Technologies for Comprehensive Transport Ministry of Transport Beijing Jiaotong University Beijing100044 China State Key Laboratory of Fire Science University of Science and Technology of China Hefei230027 China School of Urban Planning and Design Peking University Shenzhen Graduate School School of Architectural Engineering Shenzhen Polytechnic Shenzhen518055 China

Slow transportation mode, consisting of walking and cycling, plays an important role in urban traffic system. Based on the fact that bicycles and pedestrians often share the common road facility, we conducted bicycle-pedestrian mixed flow experiments to investigate the interaction effect among individuals in a 10 m-long, 3 m-wide passageway, mimicking the zebra crossing area. The goal is to explore the influence of bicycles proportion ( p ) on traffic efficiency and investigate the spatial distribution of agents in the mixed flow. Our analyses showed that the increase of bicycle proportion results in longer passing time and less travel time because of large personal space requirements of cyclists. When the bicycle proportion is small or large, the majority pedestrians (bicycles) were divided into several parts by minor bicycles (pedestrians) along the motion direction. We also recorded the following- and lateral- distance between two nearest individuals to calculate the theoretical formula of the passing time for unidirectional bicycle-pedestrian mixed flow based on the existing formula. Comparing the passing time between numerical calculation and experimental data, the effect coefficients for bicycle and pedestrian were obtained. Focusing on the overtaking bicycles, the through gap, lateral and headway distance that decide the overtaking behavior were analyzed. These findings are the first step toward the development of bicycle-pedestrian mixed flow on zebra crossing, which is contribute to provide practical implications for the planning and design of bicycle and pedestrian shared infrastructures. © 2022, The Authors. All rights reserved.

关键词： Travel time

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