检索结果-内蒙古大学图书馆

arXiv 2024年

作者： Avila, Bryant Augusto, Pedro Phillips, David Gili, Tommaso Zimmer, Manuel Makse, Hernán A. Levich Institute and Physics Department City College of New York New YorkNY10031 United States Vienna Austria Vienna Biocenter PhD Program Doctoral School the University of Vienna Medical University of Vienna Vienna Austria Mechanical Engineering Department University of New Mexico AlbuquerqueNM87131 United States Networks Unit IMT Scuola Alti Studi Lucca Piazza San Francesco 15 Lucca55100 Italy Department of Radiology Neuroradiology Service Memorial Sloan Kettering Cancer Center New YorkNY10065 United States CUNY Neuroscience Graduate Center City University of New York New YorkNY10031 United States

Understanding the dynamical behavior of complex systems from their underlying network architectures is a long-standing question in complexity theory. Therefore, many metrics have been devised to extract network features like motifs, centrality, and modularity measures. It has previously been proposed that network symmetries are of particular importance since they are expected to underly the synchronization of a system’s units, which is ubiquitously observed in nervous system activity patterns. However, perfectly symmetrical structures are difficult to assess in noisy measurements of biological systems, like neuronal connectomes. Here, we devise a principled method to infer network symmetries from combined connectome and neuronal activity data. Using nervous system-wide population activity recordings of the *** backward locomotor system, we infer structures in the connectome called fibration symmetries, which can explain which group of neurons synchronize their activity. Our analysis suggests functional building blocks in the animal’s motor periphery, providing new testable hypotheses on how descending interneuron circuits communicate with the motor periphery to control behavior. Our approach opens a new door to exploring the structure-function relations in other complex systems, like the nervous systems of larger animals. © 2024, CC BY.

关键词： Synchronization

来源：评论

学校读者我要写书评

暂无评论

Inertial Microfluidic-Assisted Rapid Detection of Chemical Contaminant in Foods Using Quantum Dots-Based Molecular Imprinting Sensor

SSRN

引用

SSRN 2023年

作者： Feng, Shaolong Lin, Yang Xu, Jie Lu, Xiaonan Food Nutrition and Health Program Faculty of Land and Food Systems The University of British Columbia VancouverBCV6T 1Z4 Canada Department of Food Science and Agricultural Chemistry McGill University Macdonald Campus 21111 Lakeshore Road Sainte-Anne-de-BellevueQCH9X 3V9 Canada Department of Mechanical and Industrial Engineering University of Illinois at Chicago ChicagoIL60607 United States University of Rhode Island United States

Integration of sample pretreatment, separation and detection in simple steps for food chemical contaminant analysis is challenging due to the complexity of food matrices. A novel analytical approach of using quantum dots-based molecular imprinting fluorescence sensor (QDs@MIPs) combined with inertial separation microfluidic device for separation and detection of enrofloxacin is presented in this study. The microfluidic device was designed based on laminar flow principle combined with Dean-coupled inertial migration of particles in spiral microchannels. Micron-sized QDs@MIPs sensing particles were synthesized for selective separation and sensitive detection of enrofloxacin. Separation of QDs@MIPs was achieved via parallel migration from the original suspension solution to another buffer solution in the same spiral microchannel with a high separation efficiency of 97.7±1.6%. Fluorescence intensity of QDs@MIPs was quenched in the presence of enrofloxacin and showed a linearity in the range of 0.1-50 µg/mL with limit of detection of 0.059 µg/mL. On-chip analyses were performed to detect enrofloxacin in both standard samples and contaminated swine muscle. This microfluidic-assisted fluorescence sensing system provides a solution to integrate sample pretreatment, separation and detection together to realize rapid analysis of food contaminants with high selectivity and sensitivity. © 2023, The Authors. All rights reserved.

关键词： Microchannels

来源：评论

学校读者我要写书评

暂无评论

Inter-Site Distance Effect in Electrocatalysis

引用

Angewandte Chemie 2025年

作者： Jiongcan Xiang Pengfei Wang Panpan Li Min Zhou Guihua Yu Zhaoyu Jin Institute of Fundamental and Frontier Sciences University of Electronic Science and Technology of China Chengdu 611731 China College of Materials Science and Engineering Sichuan University Chengdu 610065 China State Key Laboratory of Electroanalytical Chemistry Changchun Institute of Applied Chemistry Chinese Academy of Sciences Changchun 130022 China Materials Science and Engineering Program and Walker Department of Mechanical Engineering the University of Texas at Austin Austin TX 78712 USA

The inter-site distance effect (ISDE) has gained significant attention in heterogeneous catalysis, challenging classical models that treat adjacent nonbonded sites as isolated. Recent studies demonstrate that these sites can exhibit long-range cooperative interactions, enhancing reaction efficiencies. Fully leveraging the ISDE to overcome limitations in site reactivity requires a multidisciplinary approach and advanced techniques. This review provides a comprehensive overview of ISDE in electrocatalysis, starting with strategies for synthesizing materials with tunable inter-site distances. It examines ISDE across various catalyst models, including monometallic and heteronuclear atomic sites, active sites within clusters, and the lattice of nanocatalysts, focusing on their electronic structures, spatial geometries, and synergistic interactions. Advanced characterization and computational methods are highlighted as essential for identifying inter-site structures and distances, providing a systematic framework for understanding ISDE's role in electrocatalysis. The review also proposes best practices for studying ISDE, addressing current challenges and offering future perspectives. These insights aim to inform the design of highly efficient catalysts, enhance the understanding of catalytic mechanisms, and contribute to the development of more efficient energy conversion technologies, providing a foundation for further research into optimizing electrocatalysts.

关键词： Electrocatalysis Inter-site distance Single-atom catalysts Site density

来源：评论

学校读者我要写书评

暂无评论

Behavior of plane synthetic jets generated by an asymmetric stepped slot

引用

International Journal of Fluid Machinery and Systems 2020年第1期13卷 253-265页

作者： Kobayashi, Ryota Terakado, Hiroaki Sato, Kotaro Taniguchi, Junya Nishibe, Koichi Yokota, Kazuhiko Mechanical Engineering Program in the Graduate School of Engineering Kogakuin University 1-24-2 Nishi-Shinjuku Shinjuku-ku Tokyo163-8677 Japan Mechanical Engineering Program in the Graduate School of Engineering Kogakuin University 1-24-2 Nishi-Shinjuku Shinjuku-ku Tokyo163-8677 Japan Department of Mechanical System Engineering Kogakuin University 1-24-2 Nishi-Shinjuku Shinjuku-ku Tokyo163-8677 Japan Graduate School of Integrative Science and Engineering Tokyo City University 1-28-1 Tamatsuzumi Setagaya-ku Tokyo158-8557 Japan Department of Mechanical Engineering Tokyo City University 1-28-1 Tamatsuzumi Setagaya-ku Tokyo158-8557 Japan Department of Mechanical Engineering Aoyama Gakuin University 5-10-1 Fuchinobe Sagamihara-shi Kanagawa252-5258 Japan

This paper presents a fundamental study of jet directional control, i.e., thrust vectoring, using a synthetic jet generated by an asymmetric stepped slot. We present and discuss the results for a synthetic jet generated by a one-sided asymmetric stepped slot and focus on the relationship between the traveling direction of the formed jet and the offset ratio of the stepped slot and/or dimensionless frequency of the synthetic jet, within a jet deflection angle range of 0–90°. We demonstrate that there is an optimum offset ratio for jet deflection under the same dimensionless frequency because the traveling direction of the synthetic jet is dependent on the offset ratio of the stepped slot and the dimensionless stroke length (dimensionless frequency). © 2020, Turbomachinery Society of Japan. All rights reserved.

关键词： Jets

来源：评论

学校读者我要写书评

暂无评论

MOF-derived spinel NiMn2O4/CoMn2O4 heterojunction and its application in a high-performance photocatalyst and supercapacitor

引用

Journal of Environmental Chemical engineering 2023年第5期11卷

作者： Lee, Kuen-Chan Hsiao, Yu-Sheng Sung, Ming-Yen Chen, Yi-Lun Wu, Nian-Jheng Huang, Jen-Hsien Cho, Er-Chieh Weng, Huei Chu Hsu, Shih-Chieh Department of Science Education National Taipei University of Education No. 134 Section 2 Heping E. Road Da-an District Taipei City106 Taiwan Ph.D. Program in Medical Neuroscience College of Medical Science and Technology Taipei Medical University 250 Wuxing Street Taipei City110 Taiwan Department of Materials Science and Engineering National Taiwan University of Science and Technology No. 43 Section 4 Keelung Road Da-an District Taipei10607 Taiwan Department of Clinical Pharmacy School of Pharmacy College of Pharmacy Taipei Medical University 250 Wuxing Street Taipei City110 Taiwan Université Paris-Saclay CNRS Institut des Sciences Moléculaires d′Orsay Orsay91405 France Department of Green Material Technology Green Technology Research Institute CPC Corporation No. 2 Zuonan Rd. Nanzi District Kaohsiung City81126 Taiwan Department of Mechanical Engineering Chung Yuan Christian University No. 200 Chungpei Rd Chungli District Taoyuan City32023 Taiwan Department of Chemical and Materials Engineering Tamkang University No. 151 Yingzhuan Road Tamsui District New Taipei City25137 Taiwan

Metal oxide heterojunctions have attracted considerable attention in photocatalyst and supercapacitor applications. In this study, NiMn2O4/CoMn2O4 (NMO/CMO) heterojunctions were synthesized using ternary metal-organic frameworks (MOFs) as precursors. After calcination at 500 °C, the as-prepared NMO/CMO composite maintains the porous sheet-like morphology of the ternary MOF, exhibiting a highly porous structure. The heterostructured NMO/CMO composite demonstrates enhanced photocatalytic performance compared with pure NMO and CMO. This enhancement may be attributed to the well-aligned energy levels at the NMO/CMO interface, which effectively reduces charge recombination and facilitates the efficient transport of photogenerated carriers. In addition, the NMO/CMO heterojunction exhibits enhanced supercapacitor performance owing to the increased number of active redox sites and reduced charge transfer resistance. When tested at 3 A/g, the NMO/CMO composite displays a higher capacitance (756.4 F/g) than pure NMO (579.6 F/g) and CMO (519.6 F/g) and remarkable rate capability, maintaining a capacitance of 639 F/g even at 10 A/g. Notably, asymmetric supercapacitors fabricated using NMO/CMO and activated carbon can achieve an energy density of 32.18 W h/kg at 750 W/kg and superior cycling life, retaining 92.1% of its initial capacitance after 3000 cycles. © 2023 Elsevier Ltd

关键词： Heterojunctions

来源：评论

学校读者我要写书评

暂无评论

Learning Stable Models for Prediction and Control

arXiv

引用

arXiv 2020年

作者： Mamakoukas, Giorgos Abraham, Ian Murphey, Todd D. Department of Mechanical Engineering Northwestern University Evanston IL60208 United States The Robotics Institute Carnegie Mellon University PittsburghPA15213 United States

This paper demonstrates the benefits of imposing stability on data-driven Koopman operators. The data-driven identification of stable Koopman operators (DISKO) is implemented using an algorithm [1] that computes the nearest stable matrix solution to a least-squares reconstruction error. As a first result, we derive a formula that describes the prediction error of Koopman representations for an arbitrary number of time steps, and which shows that stability constraints can improve the predictive accuracy over long horizons. As a second result, we determine formal conditions on basis functions of Koopman operators needed to satisfy the stability properties of an underlying nonlinear system. As a third result, we derive formal conditions for constructing Lyapunov functions for nonlinear systems out of stable data-driven Koopman operators, which we use to verify stabilizing control from data. Lastly, we demonstrate the benefits of DISKO in prediction and control with simulations using a pendulum and a quadrotor and experiments with a pusher-slider system. The paper is complemented with a video: https://***/view/learning-stable-koopman. Copyright © 2020, The Authors. All rights reserved.

关键词： Nonlinear systems

来源：评论

学校读者我要写书评

暂无评论

Correction to: Nucleation of voids at Li‑metal–ceramic–electrolyte interfaces

引用

MRS Communications 2021年第5期11卷 699-699页

作者： Raj, Rishi Materials Science and Engineering Program Department of Mechanical Engineering University of Colorado Boulder Boulder USA

This article was updated to correct the fourth paragraph in the introduction. Due to errors introduced during the production process Ω appeared as W throughout the paragraph.

关键词：

来源：评论

学校读者我要写书评

暂无评论

Chemically Binding Scaffolded Anodes with 3D Graphene Architectures Realizing Fast and Stable Lithium Storage

引用

Research 2019年第1期2019卷 662-670页

作者： Ping Wu Zhiwei Fang Anping Zhang Xiao Zhang Yawen Tang Yiming Zhou Guihua Yu Materials Science and Engineering Program and Department of Mechanical Engineering Te University of Texas at AustinAustinTexas 78712USA Jiangsu Key Laboratory of New Power Batteries Jiangsu Collaborative Innovation Center of Biomedical Functional MaterialsSchool of Chemistry and Materials ScienceNanjing Normal UniversityNanjing 210023China

Tree-dimensional(3D)graphene has emerged as an ideal platform to hybridize with electrochemically active materials for improved ***,for lithium storage,current anodic guests ofen exist in the form of nanoparticles,physically attached to graphene hosts,and therefore tend to detach from graphene matrices and aggregate into large congeries,causing considerable capacity fading upon repeated ***,we develop a facile double-network hydrogel-enabled methodology for chemically binding anodic scafolds with 3D graphene *** tin-based alloy anodes as an example,the doublenetwork hydrogel,containing interpenetrated cyano-bridged coordination polymer hydrogel and graphene oxide hydrogel,is directly converted to a physical-intertwined and chemical-bonded Sn−Ni alloy scafold and graphene architecture(Sn−Ni/G)dual *** unique dual framework structure,with remarkable structural stability and charge-transport capability,enables the Sn−Ni/G anode to exhibit long-term cyclic life(701 mA h g^(−1) afer 200 cycles at 0.1 A g^(−1))and high rate performance(497 and 390 mA h g^(−1) at 1 and 2 A g^(−1),respectively).Tis work provides a new perspective towards chemically binding scafolded low-cost electrode and electrocatalyst materials with 3D graphene architectures for boosting energy storage and conversion.

关键词： anodic attached boosting

来源：评论

学校读者我要写书评

暂无评论

A Spatial-temporal Multiplexing Method for Dense 3D Surface Reconstruction of Moving Objects

A Spatial-temporal Multiplexing Method for Dense 3D Surface ...

引用

IEEE International Conference on robotics and Automation (ICRA)

作者： Congying Sui Kejing He Zerui Wang Congyi Lyu Huiwen Guo Yun-Hui Liu T Stone Robotics Institute and Department of Mechanical and Automation Engineering The Chinese University of Hong Kong Shatin Hong Kong China The Smarteye Tech Shenzhen China

ISBN: (数字)9781728173955

ISBN: (纸本)9781728173962

Three-dimensional reconstruction of dynamic objects is important for robotic applications, for example, the robotic recognition and manipulation. In this paper, we present a novel 3D surface reconstruction method for moving objects. The proposed method combines the spatial-multiplexing and time-multiplexing structured-light techniques that have advantages of less image acquisition time and accurate 3D reconstruction, respectively. A set of spatial-temporal encoded patterns are designed, where a spatial-encoded texture map is embedded into the temporal-encoded three-step phase-shifting fringes. The specifically designed spatial-coded texture assigns high-uniqueness codeword to any window on the image which helps to eliminate the phase ambiguity. In addition, the texture is robust to noise and image blur. Combining this texture with high-frequency phase-shifting fringes, high reconstruction accuracy would be ensured. This method only requires 3 patterns to uniquely encode a surface, which facilitates the fast image acquisition for each reconstruction step. A filtering stereo matching algorithm is proposed for the spatial-temporal multiplexing method to improve the matching reliability. Moreover, the reconstruction precision is further enhanced by a correspondence refinement algorithm. Experiments validate the performance of the proposed method including the high accuracy, the robustness to noise and the ability to reconstruct moving objects.

关键词： Image reconstruction Multiplexing Three-dimensional displays Surface reconstruction Robots Encoding Reliability

来源：评论

学校读者我要写书评

暂无评论

An Innovative Elastomer Serpentine Heat Exchanger

SSRN

引用

SSRN 2023年

作者： de Souza, Reinaldo Rodrigues Sá Barbosa, Filipe M. Nobrega, Glauco Cardoso, Elaine Maria Teixeira, J.C.F. Moita, Ana Sofia Lima, R. Metrics Mechanical Engineering Department University of Minho Campus de Azurém Guimarães4800-058 Portugal IN+ Center for Innovation Technology and Policy Research Instituto Superior Técnico Universidade de Lisboa Av. Rovisco Pais Lisboa1049-001 Portugal UNESP - São Paulo State University School of Engineering Post-Graduation Program in Mechanical Engineering Av. Brasil 56 SP Ilha Solteira15385-000 Brazil UNESP - São Paulo State University Câmpus of São João da Boa Vista São João da Boa Vista Brazil CINAMIL—Centro de Investigação Desenvolvimento e Inovação da Academia Militar Academia Militar Instituto Universitário Militar Rua Gomes Freire Lisboa1169-203 Portugal R. Dr. Roberto Frias Porto4200-465 Portugal

This work aims to present the development stages of a serpentine heat exchanger, composed uniquely of a thin layer of a silicon-based organic elastomeric polymer, polydimethylsiloxane (PDMS). The novelty of this heat exchanger is that it allows the flowing liquid to wet the surface to be cooled directly, an innovation in relation to traditional exchangers, generally made up of tubes coupled to the heating surfaces. In order to evaluate its thermal performance, experimental flow tests compared two PDMS serpentines with a hydraulic diameter of around 5.0 mm with a traditional tubular copper serpentine. The heat exchanger made of PDMS was coupled to a steel plate that simulated the rear side of a photovoltaic thermal solar panel (PVT). In addition, different geometries were tested. Although PDMS is considered a material of low thermal conductivity, the experimental results showed a greater cooling capacity when compared to the traditional heat exchanger. Though the experimental results presented here were obtained for a specific case, the innovation can be used for thermal control of central process units (CPUs), smartphones, tablets, video games, and other mechanical and electronic devices with high cooling requirements © 2023, The Authors. All rights reserved.

关键词： Thermal conductivity

来源：评论

学校读者我要写书评

暂无评论

建议与咨询留下您的常用邮箱和电话号码，以便我们向您反馈解决方案和替代方法

时间限定

文献类型

馆藏选择

核心期刊

语言

文献类型

帮助

文字说明：

检索规则说明：

检索范例：

分类表

所选分类

限定检索结果

文献类型

馆藏范围

日期分布

学科分类号

主题

机构

作者

语言

请选择保存的检索档案：

请选择收藏分类：

通借通还

建议与咨询 留下您的常用邮箱和电话号码，以便我们向您反馈解决方案和替代方法

时间限定

文献类型

馆藏选择

核心期刊

语言

文献类型

帮助

文字说明：

检索规则说明：

检索范例：

分类表

所选分类

限定检索结果

文献类型

馆藏范围

日期分布

学科分类号

主题

机构

作者

语言

请选择保存的检索档案： 新增检索档案 确定 取消

请选择收藏分类： 新增自定义分类 确定 取消

通借通还

建议与咨询留下您的常用邮箱和电话号码，以便我们向您反馈解决方案和替代方法

请选择保存的检索档案：

请选择收藏分类：