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New wormhole model with quasi-periodic oscillations exhibiting conformal motion in f(T,T)gravity

Communications in Theoretical Physics 2023年第9期75卷 59-68页

作者： G Mustafa Abdelghani Errehymy S K Maurya Munsif Jan Department of Physics Zhejiang Normal UniversityJinhua 321004China Astrophysics Research Centre School of MathematicsStatistics and Computer ScienceUniversity of KwaZulu-NatalPrivate Bag X54001Durban 4000South Africa Laboratory of High Energy Physics and Condensed Matter Department of PhysicsFaculty of Sciences Aïn ChockHassan II University of CasablancaB.P.5366 MaarifCasablanca 20100Morocco Department of Mathematical and Physical Sciences College of Arts and ScienceUniversity of NizwaNizwaOman New Uzbekistan University Mustaqillik Ave.54Tashkent 100007Uzbekistan

This analysis explores the new wormhole(WH)solution in the background of teleparallel gravity with minimal matter *** complete this study,we consider the conformal symmetry with non-zero Killing *** exact shape function is computed by considering the linear equation of state with the phantom *** energy conditions are investigated for the calculated shape function with the equation of state *** presence of exotic matter is confirmed due to the violation of the null energy *** current study also explores the physical properties of the epicyclic frequencies with quasi-periodic *** the astrophysical,epicyclic frequencies are extensively employed to explore the self-gravitating *** is concluded that a stable WH solution is acceptable for WH geometry.

关键词： extended teleparallel theory wormhole solutions epicyclic frequencies conformal symmetry

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Expressivity of Quadratic Neural ODEs

arXiv

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arXiv 2025年

作者： Hanson, Joshua Raginsky, Maxim University of Illinois UrbanaIL61801 United States Department of Electrical and Computer Engineering Coordinated Science Laboratory University of Illinois UrbanaIL61801 United States

This work focuses on deriving quantitative approximation error bounds for neural ordinary differential equations having at most quadratic nonlinearities in the dynamics. The simple dynamics of this model form demonstrates how expressivity can be derived primarily from iteratively composing many basic elementary operations, versus from the complexity of those elementary operations themselves. Like the analog differential analyzer and universal polynomial DAEs, the expressivity is derived instead primarily from the "depth" of the model. These results contribute to our understanding of what depth specifically imparts to the capabilities of deep learning architectures. Copyright © 2025, The Authors. All rights reserved.

关键词： Ordinary differential equations

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Addressing the regulatory gap: moving towards an EU AI audit ecosystem beyond the AI Act by including civil society

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AI and Ethics 2024年 1-22页

作者： Hartmann, David de Pereira, José Renato Laranjeira Streitbörger, Chiara Berendt, Bettina Faculty of Electrical Engineering and Computer Science TU Berlin Berlin Germany Weizenbaum Institute for the Networked Society Berlin Germany LAPIN - Laboratory of Public Policy and Internet Public Policy Division Brasília Brazil Bonn Sustainable AI Lab University of Bonn Bonn Germany Kammergericht Berlin Berlin Germany Department of Computer Science KU Leuven Leuven Belgium

The European legislature has proposed the Digital Services Act (DSA) and Artificial Intelligence Act (AIA) to regulate platforms and Artificial Intelligence (AI) products. We review to what extent third-party audits are part of both laws and how is access to information on models and the data provided. By considering the value of third-party audits and third-party data access in an audit ecosystem, we identify a regulatory gap in that the AIA does not provide access to data for researchers and civil society. Our contributions to the literature include: (1) Defining an AI audit ecosystem incorporating compliance and oversight. (2) Highlighting a regulatory gap within the DSA and AIA regulatory framework, preventing the establishment of an AI audit ecosystem that has effective oversight by civil society and academia. (3) Emphasizing that third-party audits by research and civil society must be part of that ecosystem, we call for AIA amendments and delegated acts to include data and model access for certain AI products. Furthermore, we call for the DSA to provide NGOs and investigative journalists with data access to platforms by delegated acts and for adaptions and amendments of the AIA to provide third-party audits and data and model access, at least for high-risk systems. Regulations modeled after EU AI regulations should enable data access and third-party audits, fostering an AI audit ecosystem that promotes compliance and oversight mechanisms.

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Atmosphere-dependent combustion of Ganoderma lucidum biomass toward its enhanced transformability into green energy

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Environmental science and Pollution Research 2024年第29期31卷 42372-42387页

作者： Cao, Hanlin Zhan, Hongda Qi, Jianying Lin, Sen Ren, Mingzhong Liang, Jiayu Evrendilek, Fatih He, Yao Liu, Jingyong Technical Centre for Soil Agriculture and Rural Ecology and Environment Ministry of Ecology and Environment Beijing100012 China Guangdong Key Laboratory of Environmental Catalysis and Health Risk Control School of Environmental Science and Engineering Guangdong University of Technology Guangzhou510006 China Ministry of Ecology and Environment South China Institute of Environmental Sciences Guangzhou510275 China Department of Electrical and Computer Engineering College of Engineering Boston University BostonMA02215 United States

Globally, the circular efficiency of biomass resources has become a priority due to the depletion and negative environmental impacts of fossil fuels. This study aimed to quantify the atmosphere-dependent combustion of Ganoderma lucidum (GL) biomass and its thermodynamic and kinetic parameters toward enhancing its circularity and transformability characteristics. The GL combustion occurred in the three stages of moisture removal, volatile release, and coke combustion. Combustion performance characteristics were more favorable in the N2/O2 atmosphere than in the CO2/O2 atmosphere under the same heating rates. The rising heating rate facilitated the release of volatiles. According to the model-free methods of Ozawa-Flynn-Wall and Kissinger–Akahira–Sunose, the activation energies essential for the primary reaction were 283.09 kJ/mol and 288.28 kJ/mol in the N2/O2 atmosphere and 233.09 kJ/mol and 235.64 kJ/mol in the CO2/O2 atmosphere. The gaseous products of the GL combustion included CH4, H2O, C = O, CO, CO2, NH3, C = C, and C–O(H). Ash prepared in both atmospheres exhibited a tendency for slag formation, with oxy-fuel combustion lowering its risk. This study thus provides a theoretical and practical basis for transforming GL residues into a sustainable energy source. Graphical abstract: (Figure presented.) © The Author(s), under exclusive licence to Springer-Verlag GmbH Germany, part of Springer Nature 2024.

关键词： Combustion

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A Regressor-Guided Graph Diffusion Model for Predicting Enzyme Mutations to Enhance Turnover Number

A Regressor-Guided Graph Diffusion Model for Predicting Enzy...

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2024 IEEE International Conference on Bioinformatics and Biomedicine, BIBM 2024

作者： Yu, Xiaozhu Yi, Kai Wang, Yu Guang Shen, Yiqing Toursun Synbio Shanghai China Duke University Pratt School of Engineering Durham United States University of Cambridge Mrc Laboratory of Molecular Biology Cambridge United Kingdom Shanghai Jiao Tong University Institute of Natural Sciences Shanghai China Johns Hopkins University Department of Computer Science Baltimore United States

ISBN: (纸本)9798350386226

Enzymes are biological catalysts that can accelerate chemical reactions compared to uncatalyzed reactions in aqueous environments. Their catalytic efficiency is quantified by the turnover number (kcat), a parameter in enzyme kinetics. Enhancing enzyme activity is important for optimizing slow chemical reactions, with far-reaching implications for both research and industrial applications. However, traditional wet-lab methods for measuring and optimizing enzyme activity are often resource-intensive and time-consuming. To address these limitations, we introduce kcatDiffuser, a novel regressor-guided diffusion model designed to predict and improve enzyme turnover numbers. Our approach innovatively reformulates enzyme mutation prediction as a protein inverse folding task, thereby establishing a direct link between structural prediction and functional optimization. kcatDiffuser is a graph diffusion model guided by a regressor, enabling the prediction of amino acid mutations at multiple random positions simultaneously. Evaluations on BERENDA dataset shows that kcatDiffuser can achieve a logkcat of 0.209, outperforming state-of-the-art methods like ProteinMPNN, PiFold, GraDe-IF in improving enzyme turnover numbers. Additionally, kcatDiffuser maintains high structural fidelity with a recovery rate of 0.716, pLDDT score of 92.515, RMSD of 3.764, and TM-score of 0.934, demonstrating its ability to generate enzyme variants with enhanced activity while preserving essential structural properties. Overall, kcatDiffuser represents a more efficient and targeted approach to enhancing enzyme activity. The code is available at https://***/xz32yu/KcatDiffuser. © 2024 IEEE.

关键词： Diffusion Models Enzyme Engineering Graph Neural Networks Protein Inverse Folding Turnover Number

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A Medium-Voltage Transformer with Integrated Leakage Inductance for 10 kV SiC-Based Dual-Active-Bridge Converter 9

A Medium-Voltage Transformer with Integrated Leakage Inducta...

引用

9th IEEE Workshop on Wide Bandgap Power Devices and Applications, WiPDA 2022

作者： Gao, Zihan Li, Haiguo Wang, Fred The University of Tennessee Min H. Kao Department of Electrical Engineering and Computer Science KnoxvilleTN United States Oak Ridge National Laboratory Oak RidgeTN United States

ISBN: (数字)9781665489003

ISBN: (纸本)9781665489003

Medium-voltage (MV) dual-active-bridge (DAB) converters have become an emerging technology thanks to high-voltage silicon carbide (SiC) devices and nanocrystalline magnetic materials. However, the need of phase-shift inductance and insulation requirements for the MV DAB may complicate the design of the transformer and the MV DAB converter, which can also induce higher loss and occupy more space. In this paper, the leakage integration and insulation techniques are discussed for a 6.7-kV/850-V DAB converter, meeting both the inductance and insulation requirements of the MV DAB converter. Ferrite cores with air gaps are inserted between the LV and MV windings without introducing high loss, and the MV winding is selectively shielded to avoid high parasitics and meet the insulation requirement. Test results have verified the effectiveness of this design. © 2022 IEEE.

关键词： Inductance

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OVGNet: A Unified Visual-Linguistic Framework for Open-Vocabulary Robotic Grasping

arXiv

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arXiv 2024年

作者： Li, Meng Zhao, Qi Lyu, Shuchang Wang, Chunlei Ma, Yujing Cheng, Guangliang Yang, Chenguang Department of Electronic and Information Engineering Beihang University China Peng Cheng Laboratory Shenzhen China SenseTime Beijing China The Department of Computer Science The University of Liverpool United Kingdom

Recognizing and grasping novel-category objects remains a crucial yet challenging problem in real-world robotic applications. Despite its significance, limited research has been conducted in this specific domain. To address this, we seamlessly propose a novel framework that integrates open-vocabulary learning into the domain of robotic grasping, empowering robots with the capability to adeptly handle novel objects. Our contributions are threefold. Firstly, we present a large-scale benchmark dataset specifically tailored for evaluating the performance of open-vocabulary grasping tasks. Secondly, we propose a unified visual-linguistic framework that serves as a guide for robots in successfully grasping both base and novel objects. Thirdly, we introduce two alignment modules designed to enhance visual-linguistic perception in the robotic grasping process. Extensive experiments validate the efficacy and utility of our approach. Notably, our framework achieves an average accuracy of 71.2% and 64.4% on base and novel categories in our new dataset, respectively. Our code and dataset are available at https://***/cv516Buaa/OVGNet. © 2024, CC0.

关键词： Nanorobots

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Fundamental Limit of Angular Resolution in Partly Calibrated Arrays with Position Errors

arXiv

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arXiv 2025年

作者： Zhang, Guangbin Wang, Yan Huang, Tianyao Eldar, Yonina C. Yangtze Delta Region Academy Beijing Institute of Technology Zhejiang Jiaxing China Radar Research Laboratory School of Information and Electronics Beijing Institute of Technology Beijing China School of Computer and Communication Engineering University of Science and Technology Beijing Beijing China Department of Computer Science and Applied Mathematics Weizmann Institute of Science Israel

We consider high angular resolution detection using distributed mobile platforms implemented with so-called partly calibrated arrays, where position errors between subarrays exist and the counterparts within each subarray are ideally calibrated. Since position errors between antenna arrays affect the coherent processing of measurements from these arrays, it is commonly believed that its angular resolution is influenced. A key question is whether and how much the angular resolution of partly calibrated arrays is affected by the position errors, in comparison with ideally calibrated arrays. To address this fundamental problem, we theoretically illustrate that partly calibrated arrays approximately achieve high angular resolution. Our analysis uses a special characteristic of Cramér-Rao lower bound (CRB) w.r.t. the source separation: When the source separation increases, the CRB first declines rapidly, then plateaus out, and the turning point is close to the angular resolution limit. This means that the turning point of CRB can be used to indicate angular resolution. We then theoretically analyze the declining and plateau phases of CRB, and explain that the turning point of CRB in partly calibrated arrays is close to the angular resolution limit of distributed arrays without errors, demonstrating high resolution ability. This work thus provides a theoretical guarantee for the high-resolution performance of distributed antenna arrays in mobile platforms. Copyright © 2025, The Authors. All rights reserved.

关键词： Source separation

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Observing periodic gap variations in cuprates

引用

Physical Review B 2024年第22期110卷 224501-224501页

作者： Riju Banerjee Emily L. Wang Eric W. Hudson National Physical Laboratory Teddington TW11 0LW United Kingdom Department of Physics The Pennsylvania State University University Park Pennsylvania 16802 USA Department of Computer Science Northwestern University Evanston Illinois 60201 USA

The presence of multiple orders in strongly correlated electronic materials like the cuprate superconductors, coupled with spatial inhomogeneity, poses a challenge to the interpretation of spectroscopic data taken on them. Here, we present a technique that directly acknowledges these orders and inhomogeneities and extracts statistically significant features from such data. Applying this technique to scanning tunneling spectroscopy measurements from single and bilayer cuprates spanning a wide doping range, we peer through local inhomogeneities and identify a gaplike feature that breaks translational and rotational symmetries and varies periodically in a fourfold pattern. This identification of spectral features aligns well with theoretical predictions of spatially modulated pair density.

关键词： FFLO Pseudogap Superconductivity Strongly correlated systems Scanning tunneling microscopy

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Civil Engineering Design in IoT: Leveraging Improved Swarm Intelligence Optimization 17

Civil Engineering Design in IoT: Leveraging Improved Swarm I...

引用

IEEE Congress on Cybermatics: 17th IEEE International Conference on Internet of Things, iThings 2024, 20th IEEE International Conference on Green Computing and Communications, GreenCom 2024, 17th IEEE International Conference on Cyber, Physical and Social Computing, CPSCom 2024, 10th IEEE International Conference on Smart Data, SmartData 2024

作者： Fu, Weiheng Chen, Rongzhong Chen, Kaiwen Xie, Xiaojun Fuzhou University College of Computer and Data Science Fuzhou China Xiamen Meteorological Bureau Xiamen Key Laboratory of Straits Meteorology Xiamen China Florida Transportarion Engineeeing Inc Roadway Design Department Punta Gorda United States Fuzhou University Zhicheng College Office of Network Security and Information Fuzhou China

ISBN: (纸本)9798350351637

Nowadays, swarm intelligence algorithms are used to solve various problem in IoT environments because of their excellent performance, and the particle swarm algorithm(PSO) is a superior algorithm in swarm intelligence algorithms. The original PSO, however, exhibits certain limitations. For instance, the utilization of random initialization results in a less diverse population distribution for PSO. During the algorithm iteration process, excessively large or small weight factors can also detrimentally impact the performance of the algorithm. Moreover, when dealing with multi-modal problems, the PSO algorithm can quickly converge to local optimal because of its "precocious". In this paper, a Double-Population Particle Swarm Optimization(DP-PSO) algorithm is proposed. Firstly, the chaotic mechanism is used to initialize the population to make its distribution more uniform and obtain better convergence results. Secondly, the oscillation characteristic of the sine function is used to improve the updating method of weight by adding the sine factor, and the search area of the particle is expanded. Finally, the double-population variation mechanism is introduced to enhance the variation ability and improve the solving accuracy in the later iteration. The experimental results show that the DP-PSO is superior to other algorithms in performance and has obvious improvement in the ability to expand the search space of the population and jump out of the local optimal solution. When applied to cantilever beam design, DP-PSO also has good competitiveness in terms of stability, robustness, and scalability. © 2024 IEEE.

关键词： Swarm intelligence

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