检索结果-南通市图书馆

Digital Twin-based Quality management Method for the Assembly Process of Aerospace Products with the Grey-markov Model and Apriori Algorithm

引用

Chinese Journal of Mechanical Engineering 2022年第5期35卷 66-86页

作者： Cunbo Zhuang Ziwen Liu Jianhua Liu HaiLong Ma Sikuan Zhai Ying Wu Laboratory of Digital manufacturing School of Mechanical EngineeringBeijing Institute of TechnologyBeijing 100081China Yangtze Delta Region Academy of Beijing Institute of Technology Jiaxing 314000China Shanghai Institute of Spacecraft Equipment Shanghai 200240China

The assembly process of aerospace products such as satellites and rockets has the characteristics of single-or small-batch production,a long development period,high reliability,and frequent disturbances.How to predict and avoid quality abnormalities,quickly locate their causes,and improve product assembly quality and efficiency are urgent engineering issues.As the core technology to realize the integration of virtual and physical space,digital twin(DT)technology can make full use of the low cost,high efficiency,and predictable advantages of digital space to provide a feasible solution to such problems.Hence,a quality management method for the assembly process of aerospace products based on DT is proposed.Given that traditional quality control methods for the assembly process of aerospace products are mostly post-inspection,the Grey-markov model and T-K control chart are used with a small sample of assembly quality data to predict the value of quality data and the status of an assembly system.The Apriori algorithm is applied to mine the strong association rules related to quality data anomalies and uncontrolled assembly systems so as to solve the issue that the causes of abnormal quality are complicated and difficult to trace.The implementation of the proposed approach is described,taking the collected centroid data of an aerospace product’s cabin,one of the key quality data in the assembly process of aerospace products,as an example.A DT-based quality management system for the assembly process of aerospace products is developed,which can effectively improve the efficiency of quality management for the assembly process of aerospace products and reduce quality abnormalities.

关键词： Quality management Digital twin Assembly process Aerospace product Grey markov model Apriori algorithm

来源：

维普期刊数据库

同方期刊数据库评论

在线全文

学校读者我要写书评

暂无评论

Boosting Transport Kinetics of Ions and Electrons Simultaneously by Ti3C2Tx(MXene)Addition for Enhanced Electrochromic Performance

引用

Nano-Micro Letters 2021年第1期13卷 381-393页

作者： Wenting Wu Huajing Fang HaiLong Ma Liangliang Wu Wenqing Zhang Hong Wang State Key Laboratory for Mechanical Behavior of materials School of Material Science and EngineeringXi’an Jiaotong UniversityXi’an 710049People’s Republic of China School of Electronic and Information Engineering and State Key Laboratory for Mechanical Behavior of materials Xi’an Jiaotong UniversityXi’an 710049People’s Republic of China Department of Physics Southern University of Science and TechnologyShenzhen 518055People’s Republic of China Department of materials Science and Engineering Southern University of Science and TechnologyShenzhen 518055People’s Republic of China Shenzhen Engineering Research Center for Novel Electronic Information materials and Devices Southern University of Science and TechnologyShenzhen 518055People’s Republic of China

Electrochromic technology plays a significant role in energy conservation,while its performance is greatly limited by the transport behavior of ions and electrons.Hence,an electrochromic system with overall excellent performances still need to be explored.Initially motivated by the high ionic and electronic conductivity of transition metal carbide or nitride(MXene),we design a feasible procedure to synthesize the MXene/WO3−x composite electrochromic film.The consequently boosted electrochromic performances prove that the addition of MXene is an effective strategy for simultaneously enhancing electrons and ions transport behavior in electrochromic layer.The MXene/WO3−x electrochromic device exhibits enhanced transmittance modulation and coloration efficiency(60.4%,69.1 cm^2 C^−1),higher diffusion coefficient of Li+and excellent cycling stability(200 cycles)over the pure WO3−x device.Meanwhile,numerical stimulation theoretically explores the mechanism and kinetics of the lithium ion diffusion,and proves the spatial and time distributions of higher Li+concentration in MXene/WO3−x composite electrochromic layer.Both experiments and theoretical data reveal that the addition of MXene is effective to promote the transport kinetics of ions and electrons simultaneously and thus realizing a high-performance electrochromic device.This work opens new avenues for electrochromic materials design and deepens the study of kinetics mechanism of ion diffusion in electrochromic devices.

关键词： Electrochromic Mxene Transport kinetics Ionic conductivity Tungsten oxide

来源：

维普期刊数据库

同方期刊数据库评论

在线全文

学校读者我要写书评

暂无评论

MimicCloudSim:An Environment for Modeling and Simulation of Mimic Cloud Service

引用

China Communications 2021年第1期18卷 212-221页

作者： Liming Pu Jiangxing Wu HaiLong Ma Yuhang Zhu Yingle Li Information Engineering University Zhengzhou 450002China

In recent years,an increasing number of application services are deployed in the cloud.However,the cloud platform faces unknown security threats brought by its unknown vulnerabilities and backdoors.many researchers have studied the Cyber Mimic Defense(CMD)technologies of the cloud services.However,there is a shortage of tools that enable researchers to evaluate their newly proposed cloud service CMD mechanisms,such as scheduling and decision mechanisms.To fill this gap,we propose MimicCloudSim as a mimic cloud service simulation system based on the basic functionalities of CloudSim.MimicCloudSim supports the simulation of dynamic heterogeneous redundancy(DHR)structure which is the core architecture of CMD technology,and provides an extensible interface to help researchers implement new scheduling and decision mechanisms.In this paper,we firstly describes the architecture and implementation of MimicCloudSim,and then discusses the simulation process.Finally,we demonstrate the capabilities of MimicCloudSim by using a decision mechanism.In addition,we tested the performance of MimicCloudSim,the conclusion shows that MimicCloudSim is highly scalable.

关键词： cyber mimic defense mimic cloud service simulation dynamic heterogeneous redundancy

来源：

维普期刊数据库

同方期刊数据库评论

在线全文

学校读者我要写书评

暂无评论

A Method for Deploying the Minimal Number of UAV Base Stations in Cellular Networks

引用

IEEE/CAA Journal of Automatica Sinica 2020年第2期7卷 559-567页

作者： hailong Huang Chao Huang Dazhong ma College of Information Science and Engineering Northeastern University

In this paper,we consider the scenario of using unmanned aerial vehicles base stations(UAV-BSs)to serve cellular users.In particular,we focus on frnding the minimum number of UAV-BSs as well as their deployment.We propose an optimization model which minimizes the number of UAV-BSs and optimize their positions such that the user equipment(UE)covered ratio is no less than the expectation of network suppliers,the UEs receive acceptable downlink rates,and the UAV-BSs can work in a sustainable manner.We show the NP-hardness of this problem and then propose a method to address it.The method first estimates the range of the number of UAV-BSs and then converts the original problem to one which maximizes the UE served ratio,given the number of UAV-BSs within that range.We present a maximizing algorithm to solve it with the proof of convergence.Extensive simulations based on a realistic dataset have been conducted to demonstrate the effectiveness of the proposed method.

关键词： Blanket coverage cellular networks coverage control proactive deployment unmanned aerial vehicles(UAV)

来源：

维普期刊数据库

同方期刊数据库评论

在线全文

学校读者我要写书评

暂无评论

Optoelectronic Synapses Based on MXene/Violet Phosphorus van der Waals Heterojunctions for Visual‑Olfactory Crossmodal Perception

引用

Nano-Micro Letters 2024年第6期16卷 38-52页

作者： HaiLong Ma Huajing Fang Xinxing Xie Yanming Liu He Tian Yang Chai Center for Advancing materials Performance From the Nanoscale(CAMP‑Nano) State Key Laboratory for Mechanical Behavior of MaterialsXi’an Jiaotong UniversityXi’an 710049People’s Republic of China Institute of Microelectronics and Beijing National Research Center for Information Science and Technology(BNRist) Tsinghua UniversityBeijing 100084People’s Republic of China Department of Applied Physics The Hong Kong Polytechnic UniversityHong KongPeople’s Republic of China

The crossmodal interaction of different senses,which is an important basis for learning and memory in the human brain,is highly desired to be mimicked at the device level for developing neuromorphic crossmodal perception,but related researches are scarce.Here,we demonstrate an optoelectronic synapse for vision-olfactory crossmodal perception based on MXene/violet phosphorus(VP)van der Waals heterojunctions.Benefiting from the efficient separation and transport of photogenerated carriers facilitated by conductive MXene,the photoelectric responsivity of VP is dramatically enhanced by 7 orders of magnitude,reaching up to 7.7 A W^(−1).Excited by ultraviolet light,multiple synaptic functions,including excitatory postsynaptic currents,pairedpulse facilitation,short/long-term plasticity and“learning-experience”behavior,were demonstrated with a low power consumption.Furthermore,the proposed optoelectronic synapse exhibits distinct synaptic behaviors in different gas environments,enabling it to simulate the interaction of visual and olfactory information for crossmodal perception.This work demonstrates the great potential of VP in optoelectronics and provides a promising platform for applications such as virtual reality and neurorobotics.

关键词： Violet phosphorus MXene Van der Waals heterojunctions Optoelectronic synapses Crossmodal perception

来源：

维普期刊数据库

同方期刊数据库评论

在线全文

学校读者我要写书评

暂无评论

Ca^(2+) and OH^- release of ceramsites containing anorthite and gehlenite prepared from waste lime mud

引用

Journal of Environmental Sciences 2016年第9期28卷 91-99页

作者： Juan Qin Chuanmeng Yang Chong Cui Jiantao Huang Ahmad Hussain HaiLong Ma School of materials Science and Engineering Nanjing University of Science and Technology Institute of Ethnic Preparatory Education Ningxia University

Lime mud is a kind of solid waste in the papermaking industry,which has been a source of serious environmental pollution.Ceramsites containing anorthite and gehlenite were prepared from lime mud and fly ash through the solid state reaction method at 1050°C.The objective of this study was to explore the efficiency of Ca^2＋ and OH-release and assess the phosphorus and copper ion removal performance of the ceramsites via batch experiments,X-ray diffraction（XRD） and scanning electron microscopy（SEM）.The results show that Ca^2＋ and OH-were released from the ceramsites due to the dissolution of anorthite,gehlenite and available lime.It is also concluded that gehlenite had stronger capacity for Ca^2＋ and OH-release compared with anorthite.The Ca^2＋ release could be fit well by the Avrami kinetic model.Increases of porosity,dosage and temperature were associated with increases in the concentrations of Ca^2＋ and OH-released.Under different conditions,the ceramsites could maintain aqueous solutions in alkaline conditions（p H = 9.3–10.9） and the release of Ca^2＋ was not affected.The removal rates of phosphorus and copper ions were as high as 96.88% and 96.81%,respectively.The final p H values of both phosphorus and copper ions solutions changed slightly.The reuse of lime mud in the form of ceramsites is an effective strategy.

关键词： Lime mud Ceramsite Gehlenite Calcium ion PH value

来源：

维普期刊数据库

同方期刊数据库评论

在线全文

学校读者我要写书评

暂无评论

Mn doping effects on the gate-tunable transport properties of Cd3As2 films epitaxied on GaAs

引用

Journal of Semiconductors 2020年第7期41卷 33-38页

作者： hailong Wang Jialin ma Qiqi Wei Jianhua Zhao State Key Laboratory of Superlattices and Microstructures Institute of SemiconductorsChinese Academy of SciencesBeijing 100083China Center of materials Science and Optoelectronics Engineering&CAS Center for Excellence in Topological Quantum Computation University of Chinese Academy of SciencesBeijing 100190China Beijing Academy of Quantum Information Sciences Beijing 100193China

The Mn doping effects on the gate-tunable transport properties of topological Dirac semimetal Cd3As2 films have been investigated.Mn-doped Cd3As2 films are directly grown on GaAs(111)B substrates by molecular-beam epitaxy,during which the single crystal phase can be obtained with Mn concentration less than 2%.Shubnikov-de Haas oscillation and quantum Hall effect are observed at low temperatures,and electrons are found to be the dominant carrier in the whole temperature range.Higher Mn content results in smaller lattice constant,lower electron mobility and larger effective band gap,while the carrier density seems to be unaffected by Mn-doping.Gating experiments show that Shubnikov-de Haas oscillation and quantum Hall effect are slightly modulated by electric field,which can be explained by the variation of electron density.Our results provide useful information for understanding the magnetic element doping effects on the transport properties of Cd3As2 films.

关键词： molecular-beam epitaxy Dirac semimetal Cd3As2 film Mn doping quantum transport

来源：

维普期刊数据库

同方期刊数据库评论

在线全文

学校读者我要写书评

暂无评论

Effects of the seasonal variation in chlorophyll concentration on sea surface temperature in the global ocean

引用

Acta Oceanologica Sinica 2021年第11期40卷 50-61页

作者： Jinfeng ma hailong Liu Pengfei Lin Haigang Zhan State Key Laboratory of Numerical Modeling for Atmospheric Sciences and Geophysical Fluid Dynamics Institute of Atmospheric PhysicsChinese Academy of SciencesBeijing 100029China College of Earth and Planetary Sciences University of Chinese Academy of SciencesBeijing 100049China Southern marine Science and Engineering Guangdong Laboratory(Guangzhou) Guangzhou 511458China State Key Laboratory of Tropical Oceanography South China Sea Institute of OceanologyChinese Academy of SciencesGuangzhou 510301China

The effects of biological heating on the upper-ocean temperature of the global ocean are investigated using two ocean-only experiments forced by prescribed atmospheric fields during 1990–2007,on with fixed constant chlorophyll concentration,and the other with seasonally varying chlorophyll concentration.Although the existence of high chlorophyll concentrations can trap solar radiation in the upper layer and warm the surface,cooling sea surface temperature(SST)can be seen in some regions and seasons.Seventeen regions are selected and classified according to their dynamic processes,and the cooling mechanisms are investigated through heat budget analysis.The chlorophyll-induced SST variation is dependent on the variation in chlorophyll concentration and net surface heat flux and on such dynamic ocean processes as mixing,upwelling and advection.The mixed layer depth is also an important factor determining the effect.The chlorophyll-induced SST warming appears in most regions during the local spring to autumn when the mixed layer is shallow,e.g.,low latitudes without upwelling and the mid-latitudes.Chlorophyll-induced SST cooling appears in regions experiencing strong upwelling,e.g.,the western Arabian Sea,west coast of North Africa,South Africa and South America,the eastern tropical Pacific Ocean and the Atlantic Ocean,and strong mixing(with deep mixed layer depth),e.g.,the mid-latitudes in winter.

关键词： sea surface temperature heat budget upwelling mixing biological heating

来源：

维普期刊数据库

同方期刊数据库评论

在线全文

学校读者我要写书评

暂无评论

A Cathodic Electrochromic material Based on Thick Perylene Bisimide Film with High Optical Contrast and High Stability

引用

CCS Chemistry 2022年第4期4卷 1347-1356页

作者： Jianqiao Wang Weitao ma hailong Wang Zengqi Xie Huanhuan Zhang Yuguang ma State Key Laboratory of Luminescent materials and Devices Institute of Polymer Optoelectronic Materials and DevicesSouth China University of TechnologyTianhe DistrictGuangzhou 510640

Cathodic electrochromic materials realized by n-type doping of conducting polymers are scarce.Even with limited cases reported in the literature,long-term stability is an urgent problem to be solved.Herein,we report a high performance and stable cathodic electrochromic material,poly(Th-Cl-PBI),based on a perylene bisimide function core.Due to its high electropolymerization efficiency and low steric hindrance of thiophene groups,perylene bisimide,which generally does not dissolve and form film easily,can grow to the sufficient thickness of 350 nm for wide-range spectral modulation and large-capacity energy storage.The optical contrast of optimized film with a thickness of 240 nm reaches as high as 69.1% at 520 nm,94.1% at 760 nm,and 95.7% at 680 nm.Theoretical simulation based on the Lambert–Beer law also verifies this optical contrast dependent on film thickness.Besides,during the transition between the neutral state and radical anion state,it maintains 90.2% of the electrochemical activity after 4000 cycles,and the transmittance spectrum remains stable after 2000 cycles.The cation size effect on cathodic electrochromic process and cyclic stability has been investigated.

关键词： cathodic electrochromism perylene bisimide n-type doping film thickness optical contrast stability

来源：

维普期刊数据库评论

在线全文

维普期刊数据库

学校读者我要写书评

暂无评论

A Safe and Reliable Heterogeneous Controller Deployment Approach in SDN

引用

China Communications 2021年第8期18卷 47-61页

作者： Peng Yi Tao Hu Yanze Qu Liang Wang HaiLong Ma Yuxiang Hu Julong Lan National Digital Switching System Engineering and Technological Research Center Zhengzhou 450002HenanChina Information Engineering University Zhengzhou 450001HenanChina

Software-Defined Networking(SDN)provides flexible and global network management by decoupling control plane from data plane,and multiple controllers are deployed in the network in a logically centralized and physically distributed way.However,the existing approaches generally deploy the controllers with the same type in the network,which easily causes homogeneous controller common-mode fault.To this end,this paper proposes heterogeneous controller deployment in the SDN,considering the different types of controllers and relevant criteria(e.g.,delay,control link interruption rate,and controller fault rate).Then,we introduce a Safe and Reliable Heterogeneous Controller Deployment(SRHCD)approach,consisting of two stages.Stage 1 determines the type and the number of heterogeneous controllers required for the SDN network based on the dynamic programming.Stage 2 divides the SDN network into multiple subnets by k-means algorithm and improves the genetic algorithm to optimize the heterogeneous controller deployment in these SDN subnets to ensure reliable switch-controller communications.Finally,the simulation results show that the proposed approach can effectively reduce the control plane fault rate and increase the attack difficulties.Besides,the switch-controller delay has been lowered by 16.5%averagely.

关键词： software defined networking control plane reliability safety controller deployment

来源：

维普期刊数据库

同方期刊数据库评论

在线全文

学校读者我要写书评

暂无评论

欢迎您,

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

在线全文

在线全文

在线全文

在线全文

在线全文

在线全文

在线全文

在线全文

在线全文

在线全文

请选择保存的检索档案：

请选择收藏分类：

通借通还

欢迎您,

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

在线全文

在线全文

在线全文

在线全文

在线全文

在线全文

在线全文

在线全文

在线全文

在线全文

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：