检索结果-内蒙古大学图书馆

Fish Lateral Line Inspired Flow Sensors and Flow-aided Control: A Review

Journal of Bionic engineering 2021年第2期18卷 264-291页

作者： Yufan Zhai Xingwen Zheng Guangming Xie State Key Laboratory for Turbulence and Complex Systems Intelligent Biomimetic Design LabCollege of EngineeringPeking UniversityBeijing 100871China Institute of Ocean Research Peking UniversityBeijing 100871China Peng Cheng Laboratory Shenzhen 518055China

Any phenomenon in nature is potential to be an inspiration for us to propose new *** line is a typical example which has attracted more interest in recent *** the aid of lateral line,fish is capable of acquiring fluid information around,which is of great significance for them to survive,communicate and hunt *** this paper,we briefly introduce the morphology and mechanism of the lateral line *** we focus on the development of artificial lateral line which typically consists of an array of sensors and can be installed on underwater robots.A series of sensors inspired by the lateral line with different sensing principles have been *** then the applications of artificial lateral line systems in hydrodynamic environment sensing and vortices detection,dipole oscillation source detection,and autonomous control of underwater robots have been *** addition,the existing problems and future foci in this field have been further discussed in *** current works and future foci have demonstrated that artificial lateral line has great potentials of applications and contributes to the development of underwater robots.

关键词： lateral line artificial lateral line bio-inspired flow sensor flow-aided control underwater robot

来源：评论

学校读者我要写书评

暂无评论

MSFR: Stance Detection Based on Multi-Aspect Semantic Feature Representation via Hierarchical Contrastive Learning

MSFR: Stance Detection Based on Multi-Aspect Semantic Featur...

引用

International Conference on Acoustics, Speech, and Signal Processing (ICASSP)

作者： Xuechen Zhao Lei Tian Feng Xie Bin Zhou Haiyang Wang Hongzhou Wu Liqun Gao School of Computer National University of Defense Technology Changsha China Key Lab. of Software Engineering for Complex Systems National University of Defense Technology Changsha China

Zero-shot stance detection aims to determine the stance of previously unseen targets during the inference phase. Achieving effective feature alignment from seen targets to unseen targets is crucial for zero-shot stance detection. In this paper, we propose MSFR, a hierarchical contrastive learning framework, which consists of two core components: inter-aspect contrastive learning for distinguishing aspect-level features and intra-aspect contrastive learning for capturing attribute-level features. Specifically, inter-aspect contrastive learning first maps the global features of an utterance to multiple aspects that influence semantic expression (referred to as aspect-level feature differentiation). This process facilitates the alignment of semantic features across different factors of seen and unseen targets. Intra-aspect contrastive learning enhances the distinguishability of features within the same aspect (referred to as attribute-level feature differentiation) and improves the model’s fine-grained generalization capability. Experimental results demonstrate the superior performance of our model compared to competing baseline models.

关键词：

来源：评论

学校读者我要写书评

暂无评论

Two-dimensional vertex-decorated Lieb lattice with exact mobility edges and robust flat bands

引用

Physical Review B 2023年第14期107卷 L140201-L140201页

作者： Yucheng Wang Long Zhang Yuhao Wan Yu He Yongjian Wang Shenzhen Institute for Quantum Science and Engineering Southern University of Science and Technology Shenzhen 518055 China International Quantum Academy Shenzhen 518048 China Guangdong Provincial Key Laboratory of Quantum Science and Engineering Southern University of Science and Technology Shenzhen 518055 China School of Physics and Institute for Quantum Science and Engineering Huazhong University of Science and Technology Wuhan 430074 China International Center for Quantum Materials School of Physics Peking University Beijing 100871 China School of Mathematical Sciences Laboratory of Mathematics and Complex Systems MOE Beijing Normal University Beijing 100875 China

The mobility edge (ME) that marks the energy separating extended and localized states is a most important concept in understanding the metal-insulator transition induced by disordered or quasiperiodic potentials. MEs have been extensively studied in three-dimensional disorder systems and one-dimensional quasiperiodic systems. However, the studies of MEs in two-dimensional (2D) systems are rare. Here, we propose a class of 2D vertex-decorated Lieb lattice models with quasiperiodic potentials only acting on the vertices of the Lieb lattice or extended Lieb lattices. By mapping these models to the 2D Aubry-André model, we obtain exact expressions of MEs and the localization lengths of localized states, and further demonstrate that the flat bands remain unaffected by the quasiperiodic potentials. Finally, we propose a highly feasible scheme to experimentally realize our model in a quantum dot array. Our results open the door to studying and realizing exact MEs and robust flat bands in 2D systems.

关键词： Anderson localization Lattice models in condensed matter

来源：评论

学校读者我要写书评

暂无评论

Trajectory Planning Towards Water-Air Trans-Media Motion for Robotic Dolphin

Trajectory Planning Towards Water-Air Trans-Media Motion for...

引用

2024 China Automation Congress, CAC 2024

作者： Xiong, Yan Zhang, Pengfei Chen, Di Yu, Junzhi State Key Laboratory for Turbulence and Complex Systems Department of Advanced Manufacturing and Robotics College of Engineering Peking University Beijing100871 China Shandong Nuclear Power Company LTD Yantai265116 China School of Intelligence Science and Technology University of Science and Technology Beijing Beijing100083 China

ISBN: (纸本)9798350368604

Water-air trans-media navigators have multi-media motion modes, breaking through the limitation that traditional robots can only operate in a single medium. Autonomous navigation is an indispensable component of the process of trans-media motion. Most of the current work has only completed the development and testing of prototypes, and the problem of task-oriented motion planning and control needs to be solved. In this paper, a safe and efficient hierarchical approach is proposed. First, a novel rapidly exploring random tree-based algorithm is proposed to search for a suitable path. Then, by fixing bound waypoints, the time-optimization trajectory is planned. Finally, the trajectory tracker is designed based on nonlinear model predictive control (NMPC). Simulation experiments numerically validate the proposed method, offering some new insights for further trans-media motions. © 2024 IEEE.

关键词： Trajectories

来源：评论

学校读者我要写书评

暂无评论

Data-Driven Multi-Objective Optimization of Power Consumption and Quality for Finishing Rolling Process

Data-Driven Multi-Objective Optimization of Power Consumptio...

引用

Data Driven Control and Learning systems (DDCLS)

作者： Xiaolu Chen Ying Yang Department of Mechanics and Engineering Science State Key Laboratory for Turbulence & Complex Systems College of Engineering Peking University Beijing P. R. China

ISBN: (数字)9798350361674

ISBN: (纸本)9798350361681

This paper investigates the operational optimization in the context of the steel hot rolling production and finishing facilities. Optimizing the operational variables of the finishing rolling process can improve the rolling quality and reduce the unit power consumption. However, there are too many operational variables in the process and their interactions are strongly coupled, making it difficult to develop an effective model for in-depth study. Therefore, this paper adopts a data-driven approach, using neural network algorithms to construct the data prediction models between performance and set values respectively. Multi-objective optimization of the set values is performed by combining the actual mechanism and equipment constraints. In the obtained Pareto optimal solutions, the conflicting choices are further balanced among multiple objectives to obtain the most suitable operating parameters. Experimentally verified using production line production data, the method proposed in this paper significantly improves the performance indexes.

关键词： Power demand Process control Production Predictive models Prediction algorithms Data models Performance analysis

来源：评论

学校读者我要写书评

暂无评论

Investigation of flooding dynamics of a damaged hull using a multiphase smoothed particle hydrodynamics method

引用

Physics of Fluids 2025年第6期37卷

作者： Cheng, Han Yan, Jiale Kong, Gaoqiang Yu, Wanli Jiangsu Ocean University Jiangsu Lianyungang222000 China State Key Laboratory for Turbulence and Complex Systems Department of Mechanics and Engineering Science BIC-ESAT College of Engineering Peking University Beijing100871 China

Ships are likely to experience significant breakages in the event of underwater explosions, collisions, strandings, and other such incidents, potentially resulting in rapid flooding, pronounced tilting, and violent shaking. These effects have profound implications, ranging from disruptions to marine operations to threats to property and human safety, including the risk of total ship loss. To investigate airflow during the flooding process, a multiphase smoothed particle hydrodynamics (SPH) model tailored for large density ratios has been developed and validated through several numerical examples. This model captures the phenomenon of air entrapment during flooding and analyzes its impact on both the flooding process and the motion of the cabin. Furthermore, the multiphase SPH model is applied to simulate flooding scenarios occurring at the bottom, stern, and side of a damaged cabin. The numerical results reveal that the presence of air can effectively delay the flooding process. Specifically, an air cushion formed within a closed cabin can significantly reduce the amount of water influx. Finally, using the multiphase SPH model, a simulation study is conducted to investigate the flooding and sinking behavior of a complex three-dimensional hull. This study explores the coupling mechanisms between fluid flow and hull motion and analyzes the resulting motion response patterns. The findings provide valuable insights for hull structural design and the formulation of maritime rescue plans. © 2025 Author(s).

关键词： Underwater explosions

来源：评论

学校读者我要写书评

暂无评论

Highly ductile hypereutectic Al-Si alloys fabricated by selective laser melting

引用

Journal of Materials Science & Technology 2022年第15期110卷 84-95页

作者： Yafeng Yang Kang Geng Shaofu Li Michael Bermingham R.D.K.Misra State Key Laboratory of Multiphase Complex Systems Institute of Process EngineeringChinese Academy of SciencesBeijing 100190China University of Chinese Academy of Sciences Beijing 100049China School of Mechanical and Mining Engineering University of QueenslandSaint LuciaQueensland 4072Australia Department of Metallurgical Materials and Biomedical EngineeringUniversity of Texas at El Paso500 W University AvenueEl PasoTX 79968USA

In the endeavor to maximize the refinement effect of primary Si and alleviate the inherent brittleness of hypereutectic Al-Si alloy,the approach of coating P as a modifier on powder was *** ultimate aim was to create more heterogeneous fine Al P nucleus and enhance the nucleation efficiency of primary Si on Al P to refine the coarse primary Si to nano-scale during 3D *** the combination of large undercooling and high density of nucleation sites,the size of primary Si was successfully refined to 200–300 nm and the divorced eutectic was also induced to modify the microstructure of *** the presence of nano-scale primary Si,the melting pool boundary(MPB)feature disappeared and the fracture mechanism also changed from load transfer to interfacial *** with the pristine alloy,the ductility was increased four times without significantly changing the ultimate tensile strength(UTS)and wear *** improvement of ductility is attributed to the refinement of primary Si,the disappearance of MPB features and the formation of divorced *** optimal tensile properties were:UTS-482 MPa,yield strength-320 MPa and ductility of 8.1%at 0.05 wt.%*** are comparable to those for high-strength Al alloys.

关键词： Al-Si alloys Heterogeneous nucleation Ductility Powder processing Selective laser melting

来源：评论

学校读者我要写书评

暂无评论

Self-powered tactile sensor for real-time recognition of Morse code based on machine learning

引用

Nano Research 2025年第2期18卷 760-768页

作者： Shenxing Tan Yang Jiang Xujiang Chao Fei Liang Ripeng Li Tao Jiang Hai-Dong Yu Zhong Lin Wang Guangzhou Institute of Blue Energy Guangzhou 510555China Frontiers Science Center for Flexible Electronics Xi'an Institute of Flexible Electronics(IFE)and Xi'an Institute of Biomedical Materials&EngineeringNorthwestern Polytechnical UniversityXi'an 710072China Beijing Key Laboratory of Micro-Nano Energy and Sensor Center for High-Entropy Energy and SystemsBeijing Institute of Nanoenergy and NanosystemsChinese Academy of SciencesBeijing 101400China School of Nanoscience and Engineering University of Chinese Academy of SciencesBeijing 100049China School of Mechanical Engineering Northwestern Polytechnical UniversityXi’an 710072China School of Computer Science(National Pilot Software Engineering School) Beijing University of Posts and TelecommunicationsBeijing 100876China

Developing lightweight,green,and flexible wearable electronics with high sensitivity and multifunctional sensing capabilities is of important significance in the field of outdoor sports,such as mountaineering,animal tracking and *** work proposes a silk fibroin fibers-based triboelectric nanogenerator(SF TENG)to harvest tiny energy from human fingertip tapping and act as a self-powered tactile *** SF-TENG adopts a green,efficient,and low-cost fabrication strategy,in which a breathable and electropositive silk fibroin fiber membrane and a silver conductive layer are prepared by electrostatic spinning and magnetron sputtering,and combined with a conductive cloth and a breathable tape to form a flexible sensor that can be attached to a human *** thin and soft portable TENG device,having a thickness of only 0.3 mm and a mass of 354 mg at the dimension of 4.5 cm×4.5 cm,can generate a maximum power density of 1.0 mW·m^(–2).Furthermore,the SF-TENG has excellent sensitivity of 1.767 mV·Pa^(–1) with good cyclic *** superior sensing characteristics provide new avenues for Morse code applications toward outdoor wearable autonomous *** proposed SF-TENG offers promising solutions in multi-scenario outdoor sport,human-machine interface interaction,and security systems.

关键词： flexible electronics triboelectric nanogenerator silk fibroin Morse code translation

来源：评论

学校读者我要写书评

暂无评论

Incentivizing Fresh Information Acquisition via Age-Based Reward

IEEE Transactions on Networking

引用

IEEE Transactions on Networking 2025年第3期33卷 1174-1188页

作者： Zhiyuan Wang Qingkai Meng Shan Zhang Hongbin Luo School of Computer Science and Engineering Beihang University Beijing China Zhongguancun Laboratory Beijing China State Key Laboratory of Virtual Reality Technology and Systems Beijing China Institute of Artificial Intelligence Beihang University Beijing China State Key Laboratory of Software Development Environment Beijing China

Many Internet platforms are information-oriented and crowd-based. They collect fresh information of various points of interest (PoIs) relying on users who happen to be nearby the PoIs. The platform will offer rewards to incentivize users and compensate their costs incurred from information acquisition. In practice, a user’s cost is his/her private information, thus both the user cost and its distribution are hidden to the platform, making it challenging to determine the optimal rewarding decision. In this paper, we investigate how the platform dynamically rewards the users, aiming to jointly reduce the age of information (AoI) and the operational expenditure (OpEx). Due to the hidden cost distribution, this is an online non-convex learning problem with bandit feedback. To overcome the challenge, we first design an age-based reward scheme, which decouples the OpEx from the unknown cost distribution and enables the platform to accurately control its OpEx. We then take advantage of the age-based reward scheme and propose an exponentially discretizing and learning (EDAL) policy for platform operation. We prove that the EDAL policy performs asymptotically as well as the optimal decision (derived from the cost distribution). Simulation results show that the age-based reward scheme protects the platform’s OpEx from the influence of the user crowd characteristics, and also verify the asymptotic optimality of the EDAL policy.

关键词： Costs Reviews Soft sensors Pricing Optimization Electronic mail Stochastic processes Simulation Laboratories Internet

来源：评论

学校读者我要写书评

暂无评论

Nonrigid Object Contact Estimation With Regional Unwrapping Transformer

arXiv

引用

arXiv 2023年

作者： Xie, Wei Zhao, Zimeng Li, Shiying Zuo, Binghui Wang, Yangang Southeast University China The Key Laboratory of Measurement and Control of Complex Systems of Engineering Ministry of Education Nanjing China

Acquiring contact patterns between hands and nonrigid objects is a common concern in the vision and robotics community. However, existing learning-based methods focus more on contact with rigid ones from monocular images. When adopting them for nonrigid contact, a major problem is that the existing contact representation is restricted by the geometry of the object. Consequently, contact neighborhoods are stored in an unordered manner and contact features are difficult to align with image cues. At the core of our approach lies a novel hand-object contact representation called RUPs (Region Unwrapping Profiles), which unwrap the roughly estimated hand-object surfaces as multiple high-resolution 2D regional profiles. The region grouping strategy is consistent with the hand kinematic bone division because they are the primitive initiators for a composite contact pattern. Based on this representation, our Regional Unwrapping Transformer (RUFormer) learns the correlation priors across regions from monocular inputs and predicts corresponding contact and deformed transformations. Our experiments demonstrate that the proposed framework can robustly estimate the deformed degrees and deformed transformations, which makes it suitable for both nonrigid and rigid contact. © 2023, CC BY-NC-SA.

关键词：

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：