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arXiv 2025年

作者： Peng, Yanting Deng, Zunyi Song, Siyu Tang, Gang Hong, Jiawang School of Aerospace Engineering Beijing Institute of Technology Beijing100081 China Advanced Research Institute of Multidisciplinary Science Beijing Institute of Technology Beijing100081 China

The recently reported auxetic piezoelectric effect, which acts as the electrical counterpart of the negative Poisson’s ratio, is of significant technical importance for applications in acoustic wave devices. However, this electric auxetic effect has not yet been reported in perovskite systems. In this work, we employ first-principles calculations to investigate the piezoelectric properties of six polar nitride perovskites with the chemical formula ABN3 (A = La, Sc, Y;B = W, Mo). Among these, all compounds except ScMoN3 exhibit the auxetic piezoelectric effect, which is characterized by an unusually positive transverse piezoelectric coefficient, along with a positive longitudinal piezoelectric coefficient. This behavior is in sharp contrast to previously reported results in HfO2, where both the longitudinal and transverse piezoelectric coefficients are negative. These unusual positive transverse piezoelectric coefficients originate from the domination of the positive internal-strain contribution. We further confirm the auxetic piezoelectric effect with finite electric field calculations. Our research enriches the understanding of the piezoelectric properties of nitride perovskites and provides a new compositional space for the design of novel auxetic piezoelectric materials. © 2025, CC BY-NC-ND.

关键词： Nitrides

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A new electromagnetic probe array diagnostic for analyzing electrostatic and magnetic fluctuations in EAST plasmas

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Plasma science and technology 2023年第7期25卷 42-53页

作者：兰恒石同辉颜宁李雪芹李实陈冉段莫疑胡广海刘鲁南张炜陈明郑元阳袁忠王勇许张后徐立清訾鹏飞陈良刘少承吴东贵丁根凡孟令义汪正初臧庆吴木泉朱翔郝保龙林晓东高翔王亮徐国盛 College of Physics and Optoelectronic Engineering Shenzhen UniversityShenzhen 518060People’s Republic of China Advanced Energy Research Center Shenzhen UniversityShenzhen 518060People’s Republic of China Institute of Plasma Physics Chinese Academy of SciencesHefei 230031People’s Republic of China Science Island Branch of Graduate School University of Science and Technology of ChinaHefei 230031People’s Republic of China

A novel electromagnetic probe array(EMPA) diagnostic, which consists of a magnetic probe array and an electrostatic probe array, has recently been developed on EAST. The EMPA is fixed near the first wall at horizontal port P. The magnetic probe array of the EMPA consists of 24 identical magnetic probes, each of them capable of measuring toroidal, poloidal and radial magnetic fluctuations simultaneously, providing additional toroidal magnetic fluctuation measurements compared with the regular magnetic probes on EAST. With a higher sampling rate and self-resonant frequency, the EMPA magnetic probes can provide higher frequency magnetic fluctuation measurements. The magnetic probe array of the EMPA is composed of two parallel layers of magnetic probes with a radial distance of 63 mm, and each layer of magnetic probes is arranged in four poloidal rows and three toroidal columns. The compact arrangement of the EMPA magnetic probe array largely improves the toroidal mode number measurement ability from-8≤ n≤ 8 to-112≤ n≤ 112, and also improves the high poloidal wave number measurement ability of magnetic fluctuations compared with the regular high frequency magnetic probes on EAST. The electrostatic probe array of the EMPA consists of two sets of four-tip probes and a single-tip probe array with three poloidal rows and four toroidal columns. It complements the electrostatic parameter measurements behind the main limiter and near the first wall in EAST. The engineering details of the EMPA diagnostic, including the mechanical system, the electrical system, the acquisition and control system, and the effective area calibration, are presented. The preliminary applications of the EMPA in L-mode and H-mode discharges on EAST have demonstrated that the EMPA works well for providing information on the magnetic and electrostatic fluctuations and can contribute to deeper physical analysis in future EAST experiments.

关键词： EAST tokamak electromagnetic probe array magnetic fluctuations electrostatic fluctuations

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Influence of rice husk ash and hybrid fiber on engineering properties of densified high-performance fiber-reinforced concrete

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Proceedings of the Institution of Mechanical Engineers, Part L: Journal of Materials: Design and Applications 2023年第11期237卷 2845-2857页

作者： Vo, Duy-Hai Nguyen, Minh-Hieu Nguyen, May Huu Hwang, Chao-Lung Huynh, Trong-Phuoc The University of Danang University of Technology and Education Danang Viet Nam Vinh Long Department of Construction Vinh Long Viet Nam Civil and Environmental Engineering Program Graduate School of Advanced Science and Engineering Hiroshima University Hiroshima Japan Department of Bridge and Tunnel Faculty of Civil Engineering University of Transport Technology Hanoi Viet Nam Taiwan Building Technology Center National Taiwan University of Science and Technology Taipei Taiwan Faculty of Civil Engineering College of Engineering Can Tho University Can Tho Viet Nam

Conventional concrete significantly affects the environment due to high CO2 emission into the atmosphere during the production process. In order to improve concrete performance and arrest the incidence of global warming, the use of additive materials for cement replacement has been promoted worldwide. This study was designed to investigate the mechanical properties of high-performance fiber-reinforced concrete (HFRC) produced using rice husk ash (RHA) and hybrid fiber (HF) in accordance with the densified mixture design algorithm (DMDA) mix design method. Samples were produced using RHA as a direct replacement for cement at 10%, 20%, and 30%. HF, comprising steel and polypropylene fibers, was added (by volume) to the 20% RHA group mixture to improve the HFRC sample properties. Based on the experimental results, higher RHA contents had a generally negative effect on the fresh properties of the HFRC mixtures. Compressive strength values ranged from 53 to 72 MPa with various RHA and HF content. RHA replacement levels up to 20% had an insignificant effect on the strength development and dynamic modulus of the HFRC samples. However, the addition of HF improved splitting tensile strength, flexural strength, and dynamic modulus remarkably at all curing ages. Furthermore, the 91-day drying shrinkage was in the ranges of 0.032%–0.039% and 0.023%–0.034% using different RHA and HF levels, respectively. Increasing both RHA and HF contents significantly reduced drying shrinkage in the samples. Multivariable regression was also performed, clarifying that all tested results were consistent and had good correlations. The results of this study also provide a potentially effective use for abundantly available industrial waste products such as fly ash (FA) and RHA to promote the production of greener and more sustainable concrete. © IMechE 2023.

关键词： Bending strength

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Regulation of c-SMAC formation and AKT-mTOR signaling by the TSG101-IFT20 axis in CD4^(+)T cells

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Cellular & Molecular Immunology 2023年第5期20卷 525-539页

作者： Jiung Jeong In Kang Yumin Kim Keun Bon Ku Jang Hyun Park Hyun-Jin Kim Chae Won Kim Jeongwoo La Hi Eun Jung Hyeon Cheol Kim Young Joon Choi Jaeho Kim Joon Kim Heung Kyu Lee Graduate School of Medical Science and Engineering Korea Advanced Institute of Science and Technology(KAIST)Daejeon 34141Republic of Korea Department of Internal Medicine Seoul National University HospitalSeoul 03080Republic of Korea Department of Biological Sciences KAISTDaejeon 34141Republic of Korea Department of Convergent Research of Emerging Virus Infection Korea Research Institute of Chemical TechnologyDaejeon 34114Republic of Korea.

CD4^(+)T cells play major roles in the adaptive immune system,which requires antigen recognition,costimulation,and cytokines for its elaborate *** studies have provided new insight into the importance of the supramolecular activation cluster(SMAC),which comprises concentric circles and is involved in the amplification of CD4^(+)T cell ***,the underlying mechanism of SMAC formation remains poorly ***,we performed single-cell RNA sequencing of CD4^(+)T cells left unstimulated and stimulated with anti-CD3 and anti-CD28 antibodies to identify novel proteins involved in their *** found that intraflagellar transport 20(IFT20),previously known as cilia-forming protein,was upregulated in antibody-stimulated CD4^(+)T cells compared to unstimulated CD4^(+)T *** also found that IFT20 interacted with tumor susceptibility gene 101(TSG101),a protein that endocytoses ubiquitinated T-cell *** interaction between IFT20 and TSG101 promoted SMAC formation,which led to amplification of AKT-mTOR ***,IFT20-deficient CD4^(+)T cells showed SMAC malformation,resulting in reduced CD4^(+)T cell proliferation,aerobic glycolysis,and cellular ***,mice with T-cell-specific IFT20 deficiency exhibited reduced allergen-induced airway ***,our data suggest that the IFT20-TSG101 axis regulates AKT-mTOR signaling via SMAC formation.

关键词： CD4^(+)T cell Intraflagellar transport 20 Tumor susceptibility gene 101 AKT-mTOR signaling Asthma Supramolecular activation cluster

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Valuation methods for professional sports clubs: A historical review, a model development, and the application to Japanese football clubs

arXiv

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arXiv 2024年

作者： Kimura, Masaaki Walsh, Zen Inoue, Takuo Takahashi, Toshiya Koizumi, Hideki Research Center for Advanced Science and Technology The University of Tokyo Japan Graduate School of Engineering The University of Tokyo Japan

Research question: In the trend towards the globalization of football and the increasing commercialization of professional football clubs, a methodology for calculating the firm value of clubs in non-western countries has yet to be established. This study reviews the valuation methods for the club firm values in Europe and North America and how values are calculated at the time of changing ownership of Japanese clubs and develops regression models with high explanatory power to estimate the more accurate firm value of Japanese football clubs. Research methods: A review of the existing literature on methods for calculating the firm value of professional sports clubs in Europe and North America, as well as financial statements and registers relating to changes of ownership of Japanese clubs, was conducted. After that, multiple regression analyses were conducted using the KPMG's enterprise value of European clubs as the explained variable. Results and Findings: From the literature review and the Japanese case studies, it has become clear that the standard valuation methods of European clubs are based on revenue, plus taking into account factors such as stadium ownership, wage ratio, operating profit, net assets, player market value, among other variables. In contrast, in Japan, valuation is based solely on the par value of stocks or net assets. Multiple regression analysis revealed that the firm value of European clubs over the past three years is best explained by revenue or player market value and the number of SNS followers. Implications: Two models with high explanatory power were developed, the estimated firm value using the revenue-based formula being higher than that based on player market value. However, in the ***, the former was more than three times higher than the latter, while the former was only 1.2 times higher for European clubs. It was suggested that the discrepancy relates to differences in European and *** clubs' revenues and asset structur

关键词： Commerce

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VMC: Video Motion Customization Using Temporal Attention Adaption for Text-to-Video Diffusion Models

VMC: Video Motion Customization Using Temporal Attention Ada...

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Conference on Computer Vision and Pattern Recognition (CVPR)

作者： Hyeonho Jeong Geon Yeong Park Jong Chul Ye Kim Jaechul Graduate School of AI Bio and Brain Engineering Korea Advanced Institute of Science and Technology (KAIST)

ISBN: (数字)9798350353006

ISBN: (纸本)9798350353013

Text-to-video diffusion models have advanced video generation significantly. However, customizing these models to generate videos with tailored motions presents a substantial challenge. In specific, they encounter hurdles in (a) accurately reproducing motion from a target video, and (b) creating diverse visual variations. For example, straight-forward extensions of static image customization methods to video often lead to intricate entanglements of appearance and motion data. To tackle this, here we present the Video Motion Customization (VMC) framework, a novel one-shot tuning approach crafted to adapt temporal attention layers within video diffusion models. Our approach introduces a novel motion distillation objective using residual vectors between consecutive noisy latent frames as a motion reference. The diffusion process then preserve low-frequency motion trajectories while mitigating high-frequency motion-unrelated noise in image space. We validate our method against state-of-the-art video generative models across diverse real-world motions and contexts. Our code and data can be found at https://***/.

关键词： Visualization Adaptation models Noise Diffusion models Vectors Trajectory Pattern recognition

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Parameter Optimization via Reinforcement Learning for the Regulation of Swarms 9

Parameter Optimization via Reinforcement Learning for the Re...

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9th International Conference on Information, Cybernetics, and Computational Social Systems, ICCSS 2023

作者： Wu, Qizhen Liu, Gaoxiang Liu, Kexin Chen, Lei School of Automation Science and Electrical Engineering Beihang University Beijing China Environment School of Automation Science and Electrical Engineering Beihang University The State Key Laboratory of Software Development Beijing China Advanced Research Institute of Multidisciplinary Sciences Beijing Institute of Technology Beijing China Yangtze Delta Region Academy of Beijing Institute of Technology Jiaxing China

ISBN: (纸本)9798350342239

The bird-oid object (Boids) model proposes a control algorithm to make the positions between agents achieve cooperative stability. By changing the parameters of cohesion and repulsion in the algorithm, the agents in the swarm can be made to converge to different positions, causing expansion and contraction of the formation. But it is often more difficult to select the appropriate parameters to form the ideal formation. Therefore, this paper proposes a method to improve the cohesive and repulsive parameters in the Boids model based on Q-learning network to achieve a simulation scenario with continuous obstacle avoidance and maximum coverage of space. © 2023 IEEE.

关键词： Reinforcement learning

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Identification and Design of Active Sites on Photocatalysts for the Direct Artificial Carbon Cycle

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Accounts of Materials Research 2022年第3期3卷 331-342页

作者： Jingxiang Low Jun Ma Jun Wan Wenbin Jiang Yujie Xiong Hefei National Laboratory for Physical Sciences at the Microscale School of Chemistry and Materials ScienceUniversity of Science and Technology of ChinaHefeiAnhui 230026China Multidisciplinary Platform of Advanced Engineering Chemical Engineering DisciplineSchool of EngineeringMonash UniversityBandar Sunway 47500 SelangorMalaysia

CONSPECTUS:Imitating the natural carbon cycle,the utilization of the carbon-based greenhouse gases(i.e.,carbon dioxide(CO_(2))and methane(CH_(4)))from the atmosphere as the carbon feedstocks for valuable fuel and chemical production represents a prospective strategy for achieving the sustainable development of human *** light of this,photocatalytic CO_(2)/CH_(4)conversions,which can directly harvest solar energy for the production of valuable fuels and chemicals,show gigantic potential for closing the loop of the artificial carbon *** the past several decades,immense progress has been made in this field,showing its practical ***,the photocatalytic conversion efficiency and selectivity of such reactions remain *** that the photocatalytic reaction is intimately related to the surface catalytic reaction on the active sites of the photocatalysts,the active site design has been proven to be effective for optimizing photocatalytic performance,yet the lack of effective techniques for the identification of the active sites,which is normally at the molecular level,greatly limits its potential in ***,with the rapid expansion in the field of materials science,a large number of advanced characterization techniques have been developed,equipping the materials scientist and chemist with powerful tools for unveiling the mask of the active sites on the ***,the active site design for the photocatalysts has undergone a ***,the identification and design of active sites have emerged as hot topics in catalysis and are expected to push forward development in the field of the artificial carbon cycle.

关键词： dioxide catalysis Active

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Towards Robust Temporal Activity Localization Learning with Noisy Labels 30

Towards Robust Temporal Activity Localization Learning with ...

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Joint 30th International Conference on Computational Linguistics and 14th International Conference on Language Resources and Evaluation, LREC-COLING 2024

作者： Liu, Daizong Qu, Xiaoye Fang, Xiang Dong, Jianfeng Zhou, Pan Nan, Guoshun Tang, Keke Fang, Wanlong Cheng, Yu Wangxuan Institute of Computer Technology Peking University China School of Cyber Science and Engineering Huazhong University of Science of Technology China Interdisciplinary Graduate Programme Nanyang Technological University Singapore College of Computer Science and Technology Zhejiang Gongshang University China School of Cyberspace Security Beijing University of Posts and Telecommunications China Cyberspace Institute of Advanced Technology Guangzhou University China Department of Computer Science and Engineering The Chinese University of Hong Kong Hong Kong

ISBN: (纸本)9782493814104

This paper addresses the task of temporal activity localization (TAL). Although recent works have made significant progress in TAL research, almost all of them implicitly assume that the dense frame-level correspondences in each video-query pair are correctly annotated. However, in reality, such an assumption is extremely expensive and even impossible to satisfy due to subjective labeling. To alleviate this issue, in this paper, we explore a new TAL setting termed Noisy Temporal activity localization (NTAL), where a TAL model should be robust to the mixed training data with noisy moment boundaries. Inspired by the memorization effect of neural networks, we propose a novel method called Co-Teaching Regularizer (CTR) for NTAL. Specifically, we first learn a Gaussian Mixture Model to divide the mixed training data into preliminary clean and noisy subsets. Subsequently, we refine the labels of the two subsets by an adaptive prediction function so that their true positive and false positive samples could be identified. To avoid single model being prone to its mistakes learned by the mixed data, we adopt a co-teaching paradigm, which utilizes two models sharing the same framework to teach each other for robust learning. A curriculum strategy is further introduced to gradually learn the moment confidence from easy to hard. Experiments on three datasets demonstrate that our CTR is significantly more robust to the noisy training data compared to the existing methods. © 2024 ELRA Language Resource Association: CC BY-NC 4.0.

关键词： Gaussian distribution

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Low-cost surface modification of a biomedical Zr-2.5Nb alloy fabricated by electron beam melting

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Journal of Materials science & technology 2023年第12期143卷 178-188页

作者： Caixu Wang Xiaoli Zhao Shujun Li Lu Liu Deliang Zhang Mitsuo Niinomi School of Materials Science and Engineering Northeastern UniversityShenyang 110819China Shi-changxu Innovation Center for Advanced Materials Institute of Metal ResearchChinese Academy of SciencesShenyang 110016China Key Laboratory of Data Analytics and Optimization for Smart Industry(Ministry of Education) Northeastern UniversityShenyang 110819China Tianjin Key Laboratory of Bone Implants Interface Functionalization and Personalization Tianjin 300190China Institute for Materials Research Tohoku UniversitySendaiMiyagi 9808577Japan Division of Materials and Manufacturing Science Graduate School of EngineeringOsaka UniversityOsaka 565-0871Japan Department of Materials Science and Engineering Graduate School of Science and TechnologyMeijo UniversityNagoya 468-8502Japan Faculty of Chemistry Materials and BioengineeringKansai UniversityOsaka 564-860Japan

The Zr-2.5Nb alloy with a fine microstructure consisting ofαlaths was successfully prepared by electron beam melting(EBM).The thermal oxidation behaviors and kinetics of the as-built,and the EBM-built and hot isostatically pressed(HIPed)Zr-2.5Nb materials in a temperature range of 450-600°C were in-vestigated and compared with those of the alloy prepared by conventional casting and *** was found that the oxidation kinetics of the as-built and the forged materials followed the parabolic rate law during isothermal oxidation at 550°C,but the HIPed materials exhibited a parabolic-to-linear kinetic transition,suggesting that the larger grain sizes enhanced the *** oxide layers of all materials were composed of a large fraction of monoclinic zirconia phase(m-ZrO_(2))and a small fraction of tetrago-nal zirconia phase(t-ZrO_(2)),and transformed from t-ZrO_(2)to m-ZrO_(2)with increasing oxidation *** surface hardness of the as-built,the forged and the HIPed materials increased from 215,204,and 188 HV before oxidation to 902,1070,and 1137 HV after oxidation,*** cross-sections of the materi-als showed the presence of micropores and microcracks inside the oxide layers with thicknesses ranging from 4 to 8μ*** the oxidation temperature of 600°C and oxidation time duration of 3 h,a dense black m-ZrO_(2)oxide layer with smooth surface and 902 HV hardness was obtained on the EBM as-built Zr-2.5Nb materials.

关键词： Zr-2.5Nb alloy Electron beam melting Thermal oxidation Oxidation behaviors and kinetics Grain size

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