检索结果-南通市图书馆

Discrete Particle simulation of Gas-Solid Flow in Air-Blowing Seed Metering Device

在线全文

学校读者我要写书评

暂无评论

Computer Modeling in Engineering & Sciences 2021年第6期127卷 1119-1132页

作者： Zhengquan Li Pei Zhang Yongchang Sun Chenglin Zheng Liang Xu Dianyu E Jiangxi Provincial Key Laboratory for simulation and modelling of Particulate Systems Jiangxi University of Science&TechnologyGanzhou341000China Energy Materials computing center Jiangxi University of Science&TechnologyNanchang330013China

In this paper,the gas and seed flow characters in the air-blowing seed metering device are investigated by using the coupled computational fluid dynamics and discrete element method(CFD-DEM)in three dimensions(3D).The method of establishing boundary model based on the computer-aided design(CAD)drawing,has been used to build the boundary model of seed metering *** 3D laser scanning technique and multi-element method are adopted to establish the particle *** a combined numerical and experimental effort,using 3D CFD-DEM software,which is based on the in-house codes,the mechanisms governing the gas and solid dynamic behaviors in the seed metering device have been *** gas velocity field and the effect of different rotational speeds and air pressures on the seeding performance and particle velocity have been studied,similar agreements between numerical and experimental results are *** reveals that the 3D CFD-DEM model established is able to predict the performance of the air-blowing seed metering *** can be used to design and optimize the air-blowing seed metering device and other similar agriculture devices.

关键词： Seed metering device CFD-DEM CAD simulation gas-solid flow

A Monte Carlo Based COVID-19 Detection Framework for Smart Healthcare

在线全文

维普期刊数据库

学校读者我要写书评

暂无评论

Computers, Materials & Continua 2022年第2期70卷 2365-2380页

作者： Tallat Jabeen Ishrat Jabeen Humaira Ashraf Nz Jhanjhi Mamoona Humayun Mehedi Masud Sultan Aljahdali Research center for modelling and simulation(RCMS)NUST Islamabad44000Pakistan Department of Computer Science and Software Engineering International Islamic UniversityIslamabad44000Pakistan School of Computer Science and Engineering SCE Taylor’s UniversitySubang Jaya47500Malaysia College of Computer Science and Information Technology Jouf UniversityAl JoufSaudi Arabia Department of Computer Science College of Computers and Information TechnologyTaif UniversityTaif21944Saudi Arabia

COVID-19 is a novel coronavirus disease that has been declared as a global pandemic in *** affects the whole world through personto-person *** virus spreads by the droplets of coughs and sneezing,which are quickly falling over the ***,anyone can get easily affected by breathing in the vicinity of the COVID-19 ***,vaccine for the disease is under clinical investigation in different pharmaceutical *** now,multiple medical companies have delivered health monitoring ***,a wireless body area network(WBAN)is a healthcare system that consists of nano sensors used to detect the real-time health condition of the *** proposed approach delineates is to fill a gap between recent technology trends and healthcare *** COVID-19 affected patient is monitored through WBAN sensors and network,a physician or a doctor can guide the patient at the right timewith the correct possible *** scenario helps the community to maintain social distancing and avoids an unpleasant environment for hospitalized patients Herein,a Monte Carlo algorithm guided protocol is developed to probe a secured cipher *** cipher helps to avoid wireless network issues like packet loss,network attacks,network interference,and routing *** Carlo based covid-19 detection technique gives 90%better results in terms of time complexity,performance,and *** indicate that Monte Carlo based covid-19 detection technique with edge computing idea is robust in terms of time complexity,performance,and efficiency and thus,is advocated as a significant application for lessening hospital expenses.

关键词： COVID-19 coronavirus cryptography Monte Carlo algorithm edge computing

Milestones in Molecular Dynamics simulations of Single-Walled Carbon Nanotube Formation: A Brief Critical Review

在线全文

维普期刊数据库

学校读者我要写书评

暂无评论

Nano Research 2009年第10期2卷 755-767页

作者： Stephan Irle Yasuhito Ohta Yoshiko Okamoto Alister JPage Ying Wang Keiji Morokuma Fukui Institute for Fundamental Chemistry Kyoto UniversityKyoto 606-8103Japan Institute for Advanced Research and Department of Chemistry Nagoya UniversityNagoya 464-8602Japan Cherry L.Emerson center for scientic Computation and Department of Chemistry Emory UniversityAtlantaGA 30322USA Department of Chemistry Nara Women’s UniversityNara 630-8506Japan

We present a brief review of the most important efforts aimed at simulating single-walled carbon nanotube(SWNT)nucleation and growth processes using molecular dynamics(MD)techniques reported in the *** simulations allow the spatio-temporal movement of atoms during nonequilibrium growth to be ***,it is hoped that a successful MD simulation of the entire SWNT formation process will assist in the design of chirality-specic SWNT synthesis *** give special consideration to the role of the metal catalyst particles assumed in standard theories of SWNT formation,and describe the actual metal behavior observed in the reported MD simulations,including our own recent quantum chemical MD *** is concluded that the use of a quantum potential is essential for a qualitatively correct description of the catalytic behavior of the metal cluster,and that carbide formation does not seem to be a necessary requirement for nucleation and growth of SWNTs according to our most recent quantum chemical MD simulations.

关键词： Carbon nanotubes transition metal catalysis molecular dynamics reactive forceelds quantum chemistry

Numerical simulation of Debris Flow Runout Using Ramms:A Case Study of Luzhuang Gully in China

在线全文

维普期刊数据库

学校读者我要写书评

暂无评论

Computer Modeling in Engineering & Sciences 2019年第12期121卷 981-1009页

作者： Jianjun Gan Y.X.Zhang Jiangxi Engineering Research center of Water Engineering Safety and Resources Efficient Utilization Nanchang Institute of TechnologyNanchangChina School of computing Engineering and MathematicsWestern Sydney UniversityNSW2751Australia

This study proposes a comprehensive method,which consists of field investigation,flume test and numerical simulation,to predict the velocity and sediment thickness of debris *** velocity and sediment thickness of the debris flow in mountainous areas can provide critical data to evaluate the geohazard,which will in turn help to understand the debris *** flume test of this debris prototype can provide friction coefficient and viscosity coefficient which are important for numerical simulation of debris *** relation between the key parameters in the numerical modelling using the Voellmy model and debris-flow rheology is *** simulation of a debris flow that occurred in Luzhuang gully,it is observed that the debris flow runout determined by the Voellmy model was well consistent with that obtained from field investigation and flume test,demonstrating the effectiveness of this *** relationship between the Voellmy model and debris flow runout is also proposed.

关键词： simulation approach debris flow flume test Voellmy model Luzhaung gully

Path planning with multiple constraints and path following based on model predictive control for robotic fish

在线全文

维普期刊数据库

学校读者我要写书评

暂无评论

Information Processing in Agriculture 2022年第1期9卷 91-99页

作者： Yizhuo Mu Jingfen Qiao Jincun Liu Dong An Yaoguang Wei College of Information and Electrical Engineering China Agricultural UniversityBeijing 100083China National Innovation center for Digital Fishery China Agricultural UniversityBeijing 100083China School of computing The Australia National UniversityCanberra 2600Australia

This paper discusses the path planning and path following control problems of robotic *** order to avoid obstacles when robotic fish swim in a complex environment,a path plan-ning method based on beetle swarm optimization(BSO)algorithm is *** method considers the influence of the robotic fish’s volume and motion constraints on the path planning task,which can eliminate the collision risk and meet the constraint of the minimum turning radius when the robotic fish obtains the planned *** construct-ing the path following controller,a multilayer perception based model predictive control(MPC)is adopted to design the optimal control method,and the objective function of the optimal control is dynamically adjusted according to the path *** simulation results show that this proposed method can effectively overcome the complexity of robotic fish kinematics modelling and adapt well to the reference paths of different curvatures given by the path planner.

关键词： Path planning Path following Robotic fish Beetle swarm optimization Model predictive control

Physics-based fuid simulation in computer graphics: Survey, research trends, and challenges

在线全文

维普期刊数据库

学校读者我要写书评

暂无评论

Computational Visual Media 2024年第5期10卷 803-858页

作者： Xiaokun Wang Yanrui Xu Sinuo Liu Bo Ren Jiri Kosinka Alexandru C.Telea Jiamin Wang Chongming Song Jian Chang Chenfeng Li Jian Jun Zhang Xiaojuan Ban Beijing Advanced Innovation center for Materials Genome Engineering and School of Intelligence Science and Technologyand Shunde Innovation School University of Science and Technology BeijingBeijing 100083China National center for Computer Animation Faculty of Media and CommunicationBournemouth UniversityPoole BH125BBUK. Bernoulli Institute University of GroningenGroningen 9700 AKthe Netherlands School of Computer Science Peking UniversityBeijing 100871China. TMCC College of Computer ScienceNankai UniversityTianjin 300350China Department of Information and computing Sciences Utrecht UniversityUtrecht 3584 CCthe Netherlands. Zienkiewicz Institute for modelling Data and AISwansea UniversitySwansea SA18ENUK. Institute of Materials Intelligent Technology Liaoning Academy of MaterialsShenyang 110004China.

Physics-based fluid simulation has played an increasingly important role in the computer graphics *** methods in this area have greatly improved the generation of complex visual effects and its computational *** techniques have emerged to deal with complex boundaries,multiphase fluids,gas-liquid interfaces,and fine *** parallel use of machine learning,image processing,and fluid control technologies has brought many interesting and novel research *** this survey,we provide an introduction to theoretical concepts underpinning physics-based fuid simulation and their practical implementation,with the aim for it to serve as a guide for both newcomers and seasoned researchers to explore the field of physics-based fuid simulation,with a focus on developments in the last *** by the distribution of recent publications in the field,we structure our survey to cover physical background;discretization approaches;computational methods that address scalability;fuid interactions with other materials and interfaces;and methods for expressive aspects of surface detail and *** a practical perspective,we give an overview of existing implementations available for the above methods.

关键词： computer graphics physical simulation fluid simulation fluid coupling

在线全文

维普期刊数据库

学校读者我要写书评

暂无评论

计算最小体积覆盖椭球的坐标轴下降算法

中国科学：数学 2021年第12期51卷 2065-2086页

作者：陶杰张威卢超 Mark Goh 上海理工大学管理学院上海200093 center of Excellence in modelling and simulation for Next Generation Ports National University of SingaporeSingapore 117602Singapore 上海大学管理学院上海200444 Business School National University of SingaporeSingapore 117592Singapore

最小体积覆盖椭球问题是一个基本的凸优化问题.本文给出最小体积覆盖椭球问题的新性质—对算法依坐标轴光滑性,据此提出一种坐标轴下降算法来计算最小体积覆盖椭球并证明该算法的收敛速度是全局次线性收敛且局部线性收敛的.从计算时间... 详细信息

最小体积覆盖椭球问题是一个基本的凸优化问题.本文给出最小体积覆盖椭球问题的新性质—对算法依坐标轴光滑性,据此提出一种坐标轴下降算法来计算最小体积覆盖椭球并证明该算法的收敛速度是全局次线性收敛且局部线性收敛的.从计算时间角度来看,该算法优于经典的Frank-Wolfe算法,并且这种优势对于高维数据集尤为明显.更进一步,我们发现该算法在计算最小体积覆盖椭球问题方面比随机坐标轴下降算法更有优势.最后通过大规模数值算例测试来验证我们得到的理论结果.

关键词：最小体积覆盖椭球一阶导数算法坐标轴下降

Inferring Functional Connectivity in fMRI Using Minimum Partial Correlation

在线全文

学校读者我要写书评

暂无评论

International Journal of Automation and computing 2017年第4期14卷 371-385页

作者： Lei Nie Xian Yang Paul M. Matthews Zhi-Wei Xu Yi-Ke Guo Department of computing Imperial College London London SW7 2AZ UK Department of Medicine Imperial College London London SW7 2AZ UK Institute of computing Technology Chinese Academy of Sciences Beijing 100190 China School of Computer Engineering and Science Shanghai University Shanghai 200444 China

Functional connectivity has emerged as a promising approach to study the functional organisation of the brain and to define features for prediction of brain state. The most widely used method for inferring functional connectivity is Pearson＇s correlation, but it cannot differentiate direct and indirect effects. This disadvantage is often avoided by computing the partial correlation between two regions controlling all other regions, but this method suffers from Berkson＇s paradox. Some advanced methods, such as regularised inverse covariance, have been applied. However, these methods usually depend on some parameters. Here we propose use of minimum partial correlation as a parameter-free measure for the skeleton of functional connectivity in functional magnetic resonance imaging （flVIRI）. The minimum partial correlation between two regions is the minimum of absolute values of partial correlations by controlling all possible subsets of other regions. Theoretically, there is a direct effect between two regions if and only if their minimum partial correlation is non-zero under faithfulness and Gaussian assumptions. The elastic PC-algorithm is designed to efficiently approximate minimum partial correlation within a computational time budget. The simulation study shows that the proposed method outperforms others in most cases and its application is illustrated using a resting-state fMRI dataset from the human connectome project.

关键词： Functional connectivity functional magnetic resonance imaging (fMRI) network modelling partial correlation PC-algorithm resting-state networks.

Realization of Reconfigurable Virtual Environments for Virtual Testing

在线全文

学校读者我要写书评

暂无评论

International Journal of Automation and computing 2005年第1期2卷 25-36页

作者： Wen-Yan Wu Zheng-Xu Zhao School of computing Engineering & Technology Staffordshire University Stafford UK Virtual Reality Research Technology center Southeast University Nanjing PRC

This paper presents the design and implementation of reconfigurable virtual environments (VEs) for virtual testing. It proposes a hybrid design approach that is derived from a so-called integration and composition of the reconfiguration strategy. The designing process has thus evolved from binding virtual objects using reconfiguration rules within the context of virtual testing scenarios. Therefore reconfigurable virtual environments are established with improved flexibility and scalability, tailored to a wide range of virtual testing applications. Those virtual environments integrate virtual testing scenarios, data acquisition, databases, rule mapping and application interfaces, which yield modular testing functions and an open-ended system architecture with a set of extensible interface tools to realize data exchange within reconfigurable VEs. This enables virtual testing scenarios to be reconfigured interactively based on real time data and communication between virtual environments and real environments. A virtual testing application has been implemented using reconfigurable VEs. Keywords Virtual environment - virtual testing - reconfigurable virtual reality Wenyan Wu graduated from Dalian University of Technology, China, with BSc and MSc in 1988 and 1991 respectively. She earned her PhD degree from University of Derby, UK, in 2002. She had taught and researched in Harbin Institute of Technology, China and De Montfort University, UK. She is currently a senior lecturer in simulation and virtual reality at Staffordshire University, UK. Her research interests include computer graphics, Virtual Reality and Augmented Reality system, advanced interface, modelling and simulation, distribution system.Zhengxu Zhao BSc, MSc, PhD, CEng, CITP, MBCS, full Professor in Applied computing, Director of Virtual Reality Centre. He is also a Cheng Kong Scholar Project Professor in Virtual Reality Technology and Director of Virtual Reality Research Centre at the Southeast Uni

关键词： Virtual environment virtual testing reconfigurable virtual reality