检索结果-内蒙古大学图书馆

Mathematical Modelling of Nonlinear Heat Conduction with Relaxing Boundary Conditions 1

10th International Conference on Numerical Methods and Applications, NMA 2022

作者： Filipov, Stefan M. Faragó, István Avdzhieva, Ana Department of Computer Science Faculty of Chemical and System Engineering University of Chemical Technology and Metallurgy Sofia Bulgaria Department of Differential Equations Institute of Mathematics Budapest University of Technology and Economics & MTA-ELTE Research Group Budapest Hungary Faculty of Mathematics and Informatics "St. Kl. Ohridski" University of Sofia Sofia Bulgaria

ISBN: (数字)9783031324123

ISBN: (纸本)9783031324116

This paper considers one dimensional unsteady heat condition in a media with temperature dependent thermal conductivity. When the thermal conductivity depends on the temperature, the corresponding heat equation is nonlinear. At one or both boundaries, a relaxing boundary condition is applied. It is a time dependent condition that approaches continuously, as time increases, a certain time independent condition. Such behavior at the boundaries arises naturally in some physical systems. As an example, we propose a simple model system that can give rise to either Dirichlet or convective relaxing boundary condition. Due to the dependence of the thermal conductivity on the temperature, the convective condition is nonlinear. For the solution of the problem, we propose a new numerical approach that first discretizes the heat equation in time, whereby a sequence of two-point boundary value problems (TPBVPs) is obtained. We use implicit time discretization, which provides for unconditional stability of the method. If the initial condition is given, we can solve consecutively the TPBVPs and get approximations of the temperature at the different time levels. For the solution of the TPBVPs, we apply the finite difference method. The arising nonlinear systems are solved by Newton’s method. A number of example problems are solved demonstrating the efficiency of the proposed approach. © 2023, The Author(s), under exclusive license to Springer Nature Switzerland AG.

关键词： Boundary conditions

来源：评论

学校读者我要写书评

暂无评论

Trajectory Tracking Using Linear State Feedback Controller for a Mecanum Wheel Omnidirectional 6th

Trajectory Tracking Using Linear State Feedback Controller f...

引用

6th IFToMM Asian Mechanisms and Machine science Conference, Asian MMS 2021

作者： Thai, Nguyen Hong Ly, Trinh Thi Khanh Long, Nguyen Thanh Dzung, Le Quoc Department of Mechanical Design and Robotics School of Mechanical Engineering HanoiUniversity of Science and Technology Hanoi Viet Nam Faculty of Automation Technology Electric Power University Hanoi Viet Nam

ISBN: (纸本)9783030918910

This paper presents a method to design a linear state feedback controller for the mecanum wheel omnidirectional to track a NURBS curve trajectory. Firstly, the robot's kinematic model and kinematic error were established to design a linear state feedback controller. Then, determine the parameters of the controller according to the varying angular velocity for the desired trajectory. An omnidirectional robot platform has been experimental designed and manufactured for experimental verification of the proposed controller. The simulation and experimental results show that the kinematic controller devel-oped by this study has high-performance trajectory tracking with minor tracking errors. © 2022, The Author(s), under exclusive license to Springer Nature Switzerland AG.

关键词： Controllers

来源：评论

学校读者我要写书评

暂无评论

Al-Biruni Based Optimization of Rainfall Forecasting in Ethiopia

引用

Computer systems science & engineering 2023年第6期45卷 2885-2899页

作者： El-Sayed M.El-kenawy Abdelaziz A.Abdelhamid Fadwa Alrowais Mostafa Abotaleb Abdelhameed Ibrahim Doaa Sami Khafaga Department of Communications and Elecronics Delta Higher Institute of Engineering and TechnologyMansoura35111Egypt Department of Computer Science F aculty of Computer and Infomation SciencesAin Shams UniversityCairo11566Egypt Department of Computer Science College of Computing and Information TechnologyShaqra University11961Saudi Arabia Department of Computer Sciences College of Computer and Information SciencesPrincess Nourah Bint Abdulrahman UniversityP.O.Box 84428Riyadh11671Saudi Arabia Department of System Progamming South Ual State UniversityChelyabinsk454080Russia Computer Engineering and Control Systems Department Faculty of EngineeringMansoura UniversityMansoura35516Egypt

Rainfall plays a significant role in managing the water level in the *** unpredictable amount of rainfall due to the climate change can cause either overflow or dry in the *** individuals,especially those in the agricultural sector,rely on rain *** rainfall is challenging because of the changing nature of the *** area of Jimma in southwest Oromia,Ethiopia is the subject of this research,which aims to develop a rainfall forecasting *** estimate Jimma's daily rainfall,we propose a novel approach based on optimizing the parameters of long short-term memory(LSTM)using Al-Biruni earth radius(BER)optimization algorithm for boosting the fore-casting accuracy.N ash-Sutcliffe model eficiency(NSE),mean square error(MSE),root MSE(RMSE),mean absolute error(MAE),and R2 were all used in the conducted experiments to assess the proposed approach,with final scores of(0.61),(430.81),(19.12),and(11.09),***,we compared the proposed model to current machine-learning regression models;such as non-optimized LSTM,bidirectional LSTM(BiLSTM),gated recurrent unit(GRU),and convolutional LSTM(ConvLSTM).It was found that the proposed approach achieved the lowest RMSE of(19.12).In addition,the experimental results show that the proposed model has R-with a value outperforming the other models,which confirms the superiority of the proposed *** the other hand,a statistical analysis is performed to measure the significance and stability of the proposed approach and the recorded results proved the expected perfomance.

关键词： Rainfall prediction long short-term memory Al-Biruni earth radius algorithm meta-heuristic optimization

来源：评论

学校读者我要写书评

暂无评论

Experimental Study for the Particle-Wall Interaction on the Particle Velocity and Dispersion in Particle-Laden Turbulent Boundary Layer at High Reynolds Number

SSRN

引用

SSRN 2023年

作者： Kim, Taehoon Department of Mechanical System Design Engineering Seoul National University of Science and Technology Seoul01811 Korea Republic of

In a horizontal wind tunnel, experiments were performed on either particle-free or particle-laden flows at the same incoming velocity. Glass micro-spheres were carried by air along the turbulent boundary layer at a high Reynolds number ($Re_\tau=3200$). Two sizes of the solid particles were considered to have Stokes numbers $St^+=O(10)$ and $O(10^2)$ when based on the viscous time scale. Under the similar volume fraction, $\Phi_v=O(10^{-5})$, velocity and spatial distribution of solid inertial particles were investigated by a simultaneous particle image/tracking velocimetry measurements and a time-resolved particle imaging exploring particle dynamics and its corresponding spatial structure in the particle-laden turbulent boundary layer. The results showed that the particle-wall (PW) interaction occurs in both particle-laden flows. However, the particle Stokes number directly affects the intensity of the PW interaction, significantly altering the behavior and spatial organization of particles. The results from the Voronoi tessellation technique confirmed that preferential clustering still happens for the small particle case. In particular, premultiplied spectra for the particle concentration showed that the temporal pattern of the particle clustering presents a similar time-scale to the very large scale motion ($\sim22\delta$, where $\delta$ is the boundary layer thickness) in the near-wall region. © 2023, The Authors. All rights reserved.

关键词： Reynolds number

来源：评论

学校读者我要写书评

暂无评论

Effect of Particle Size Distribution on the Transmission Efficiency of Atomized Water to the Tracheal Tube

SSRN

引用

SSRN 2023年

作者： Asakura, Takumi Yoshioka, Keisuke Ogawa, Ami Kurashina, Yuta School of Mechanical Engineering Graduate School of Science and Technology Tokyo University of Science Japan Department of System Design Engineering Faculty of Science and Technology Keio University Yokohama Japan Division of Advanced Mechanical Systems Engineering Institute of Engineering Tokyo University of Agriculture and Technology Japan

Ultrasonic atomization is a widely used technology. As the atomization device, lead zirconate titanate (PZT) and lithium niobate (LN) are comparatively investigated through experimental and numerical schemes. However, knowledge on a profitable scheme by which to efficiently deliver the atomized particles into the tracheal tube remains unclear. In this study, the physical difference of the transmission efficiency of water particles atomized by PZT and LN devices was measured. The water particles atomized by PZT and LN were injected into a human airway model including a nasal cavity and bronchial tube. The distribution of the amount of transmitted particles deposited at each of the monitoring positions was then estimated using the results of image analysis of color intensity. As a result, the atomized particles of the PZT device, which produced larger particles than the LN device, were more strongly affected by inertia and tended to be deposited at the area closer to the entrance of the nasal cavity. In contrast, the particles produced by the LN device tended to be transmitted deeper into the trachea. The experimental results indicated that the particle size distribution of PZT and LN, which have quite different maximum sizes of particles, largely influences the spatial distribution characteristics of particle deposition along the airway from the nasal cavity to the trachea. © 2023, The Authors. All rights reserved.

关键词： Particle size analysis

来源：评论

学校读者我要写书评

暂无评论

A multi-axis robot-based bioprinting system supporting natural cell function preservation and cardiac tissue fabrication

引用

Bioactive Materials 2022年第12期7卷 138-150页

作者： Zeyu Zhang Chenming Wu Chengkai Dai Qingqing Shi Guoxin Fang Dongfang Xie Xiangjie Zhao Yong-Jin Liu Charlie CLWang Xiu-Jie Wang Institute of Genetics and Developmental Biology Innovation Academy of Seed DesignChinese Academy of SciencesBeijing100101China Beijing National Research Center for Information Science and Technology Department of Computer Science and TechnologyTsinghua UniversityBeijing100084China Department of Mechanical Aerospace and Civil EngineeringThe University of ManchesterManchesterM204BXUK Faculty of Industrial Design Engineering Delft University of TechnologyDelft2628the Netherlands University of Chinese Academy of Sciences Beijing100049China

Despite the recent advances in artificial tissue and organ engineering,how to generate large size viable and functional complex organs still remains as a grand challenge for regenerative ***-dimensional bioprinting has demonstrated its advantages as one of the major methods in fabricating simple tissues,yet it still faces difficulties to generate vasculatures and preserve cell functions in complex organ ***,we overcome the limitations of conventional bioprinting systems by converting a six degree-of-freedom robotic arm into a bioprinter,therefore enables cell printing on 3D complex-shaped vascular scaffolds from all *** also developed an oil bath-based cell printing method to better preserve cell natural functions after *** with a self-designed bioreactor and a repeated print-and-culture strategy,our bioprinting system is capable to generate vascularized,contractible,and long-term survived cardiac *** bioprinting strategy mimics the in vivo organ development process and presents a promising solution for in vitro fabrication of complex organs.

关键词： Six degree-of-freedom robot 3D bioprinting Artificial organ engineering Print-and-culture Cardiac tissue fabrication

来源：评论

学校读者我要写书评

暂无评论

BS Coordination Optimization in Integrated Sensing and Communication: A Stochastic Geometric View

BS Coordination Optimization in Integrated Sensing and Commu...

引用

IEEE Conference on Wireless Communications and Networking

作者： Kaitao Meng Christos Masouros Guangji Chen Fan Liu Department of Electronic and Electrical Engineering University College London UK Nanjing University of Science and Technology China School of System Design and Intelligent Manufacturing Southern University of Science and Technology China

ISBN: (数字)9798350303582

ISBN: (纸本)9798350303599

In this study, we explore integrated sensing and communication (ISAC) networks to strike a more effective balance between sensing and communication (S&C) performance at the network scale. We leverage stochastic geometry to analyze the S&C performance, shedding light on critical cooperative dependencies of ISAC networks. According to the derived expres-sions of network performance, we optimize the user/target loads and the cooperative base station cluster sizes for S&C to achieve a flexible trade-off between network-scale S&C performance. It is observed that the optimal strategy emphasizes the full utilization of spatial resources to enhance multiplexing and diversity gain when maximizing communication ASE. In contrast, for sensing objectives, parts of spatial resources are allocated to cancel inter-cell sensing interference to maximize sensing ASE. Simulation results validate that the proposed ISAC scheme realizes a remarkable enhancement in overall S&C network performance.

关键词： Multiplexing Geometry Base stations Array signal processing Simulation Interference Diversity methods

来源：评论

学校读者我要写书评

暂无评论

Detailed Analysis of Blink Types Classification Using a 3D Convolutional Neural Network

IEEJ Transactions on Electronics, Information and Systems

引用

IEEJ Transactions on Electronics, Information and systems 2023年第9期143卷 971-978页

作者： Sato, Hironobu Abe, Kiyohiko Matsuno, Shogo Ohyama, Minoru College of Science and Engineering Kanto Gakuin University 1-50-1 Mutsuura-higashi Kanazawa-ku Kanagawa Yokohama236-8501 Japan School of System Design and Technology Tokyo Denki University 5 Senju Asahi-cho Adachi-ku Tokyo120-8551 Japan Faculty of Informatics Gunma University 4-2 Aramaki-machi Gunma Maebashi371-8510 Japan

In the development of blink input interfaces, it is important to classify between conscious (voluntary) and naturally occurring (involuntary) blinks. In the previous studies, some systems employed a long blink as a voluntary blink, but determining the appropriate discriminative condition was difficult. To avoid the problem of individual differences in discrimination conditions, an individual calibration method was proposed, but the calibration procedure increases the burden on the user. In this study, we introduce a new 3D convolutional neural network (3D CNN), which deals with spatial and temporal dimensional directions. This 3D CNN model is trained with a moving image dataset of the periocular area. For the proposed 3D CNN, a sequence of seven images cut from a video sequence is used as a set of an input sample to classify three states;voluntary, involuntary, and not blinking. In this study, data of five subjects were used for training and seven for testing. A detailed analysis of the result revealed that the biased position of the open-eye area in the images leads to a lower classification rate. To address this problem, we propose an automatic determination method for the area to be cropped in the periocular image and verify its performance. © 2023 The Institute of Electrical Engineers of Japan.

关键词： Convolutional neural networks

来源：评论

学校读者我要写书评

暂无评论

Sparse Actuator and Sensor Attacks Reconstruction for Linear Cyber-Physical systems with Sliding Mode Observer

引用

IEEE Transactions on Neural systems and Rehabilitation engineering 2022年 30卷 390-399页

作者： Yang, Hongyan Yin, Shen Han, Honggui Sun, Haoyuan Faculty of Information Technology Beijing Key Laboratory of Computational Intelligence and Intelligent System Engineering Research Center of Digital Community Ministry of Education Beijing Artificial Intelligence Institute Beijing Laboratory for Intelligent Environmental Protection Beijing University of Technology Beijing100124 China Department of Mechanical and Industrial Engineering Norwegian University of Science and Technology Trondheim7491 Norway

Driven by the rapid development of modern industrial processes, cyber-physical systems (CPSs), which tightly conjoin computational and physical resources, have become ever-more prevalent during recent years. However, due to the intrinsical vulnerability of the cyber layer, the system performances of CPSs are easily degraded by malicious false data injection (FDI) attacks, which are launched by adversary. In this article, the issue of secure reconstruction is considered for linear CPSs with simultaneous sparse actuator and sensor attacks. First, an adaptive counteraction searching strategy is proposed to identify the potential combinational attack mode. In this way, malicious FDI attacks are excluded. Second, by constructing a descriptor switched sliding mode observer, the sparse FDI attacks and the system state are reconstructed effectively. Meanwhile, sufficient conditions of the error convergence can be derived. Finally, a numerical simulation is utilized to illustrate the applicability of the proposed theoretical derivation. © 2005-2012 IEEE.

关键词： Virtual reality

来源：评论

学校读者我要写书评

暂无评论

Enabling Quadruple-D Compensation Coil Integration for Efficient Power Transfer to Receiver in Wireless Power Transfer systems for EV Charging

引用

IEEE Journal of Emerging and Selected Topics in Power Electronics 2025年

作者： Erel, Mehmet Zahid Imtiaz, Tabish Elsanabary, Ahmed Mubin, Marizan Soon, Tey Kok Mekhilef, Saad Ankara Yildirim Beyazit University Department of Energy Systems Engineering Ankara Turkey Universiti Malaya Faculty of Engineering Department of Electrical Engineering Kuala Lumpur Malaysia Port Said University Faculty of Engineering Department of Electrical Engineering Port Said Egypt Universiti Malaya Department of Computer System and Technology Faculty of Computer Science and Information Technology Kuala Lumpur Malaysia Swinburne University of Technology School of Science Computing and Engineering Technologies Hawthorn Australia Presidency University Department of Electrical and Electronics Engineering Karnataka Bengaluru India

Wireless power transfer (WPT) presents a promising approach for charging electric vehicles (EVs), offering increased convenience, reliability, and safety for EV customers. Recently, the incorporation of multiple coil structures in wireless charging systems has addressed various operational challenges, enhanced power transfer, and provided a scalable solution for EVs. However, cross-coupling issues and space limitation problems arise when multiple coils are introduced to the WPT system. In this paper, a novel integrated compact coupler is proposed, including two naturally decoupled coils on the transmitter side, while both are coupled with the receiver coil to improve the power transfer capability of the system. ANSYS Maxwell is employed to simulate the proposed coupler and evaluate its performance under misalignment operations. The proposed wireless charging system inherently detects misalignment direction based on the variation of output voltage with respect to x-misalignment. As a result, the experimental prototype of the designed wireless WPT system presents a peak efficiency of 97.08% at 1.147-kW output power for an air gap of 120 mm under fully-aligned condition. Additionally, the designed compensation coil can transfer power of 243.76-W under fully-aligned condition and increases reliability in power transfer during misalignment operations. © 2013 IEEE.

关键词： Inductive power transmission

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：