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多晶Sr_2Fe_(1-x)Al_xMoO_6的晶粒内低场磁电阻效应

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物理学报 2005年第2期54卷 907-911页

作者：王先杰隋郁千正男程金光刘志国李妍苏文辉 c.k.ong 哈尔滨工业大学理学院凝聚态科学与技术研究中心哈尔滨150001 新加坡国立大学物理系超导与磁性材料研究中心新加坡117542

用传统的固相反应法合成了Fe位掺杂Al的双钙钛矿型氧化物Sr2 Fe1 -xAlxMoO6 (x =0 0 ,0 0 5 ,0 10 ,0 15 ,0 3)多晶材料 .x射线衍射和扫描电子显微分析显示 ,在Fe位掺杂Al既没有引入杂相 ,也没有明显改变Sr2 FeMoO6 多晶材料的晶... 详细信息

用传统的固相反应法合成了Fe位掺杂Al的双钙钛矿型氧化物Sr2 Fe1 -xAlxMoO6 (x =0 0 ,0 0 5 ,0 10 ,0 15 ,0 3)多晶材料 .x射线衍射和扫描电子显微分析显示 ,在Fe位掺杂Al既没有引入杂相 ,也没有明显改变Sr2 FeMoO6 多晶材料的晶粒尺寸和晶界状态 .非磁性Al离子的掺杂使晶粒内部磁有序区细化成更小的区域 ,同时使反铁磁区内的磁耦合作用变弱 .这一方面提高了亚铁磁区磁化方向的磁场灵敏度 ;另一方面也降低了反铁磁区对自旋相关电子的散射 ;两方面的共同作用使Sr2 FeMoO6 的低场磁电阻效应明显增强 ,但这种尺寸效应也使材料的磁电阻在高温下下降得更快 .

关键词：反铁磁磁电阻效应钙钛矿型氧化物自旋掺杂磁性离子低场改变作用

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Hedgerow Intercropping Maize or cowpealSenna for Drymatter Production in Semi-Arid Eastern kenya

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Journal of Agricultural Science and Technology(B) 2011年第3期1卷 372-384页

作者： J. M. kinama c. k. ong c. J. Stigter J. k. Ng＇ang＇a F. N. Gichuki Department of Plant Science and crop Protection University of Nairobi Box 30197-00100 Nairobi Kenya Wageningen Agric. University Duivendaal 2 6701 AP The Netherlands World Agroforestty centre （1cRAF） P.O Box 30667-00100 Nairobi Kenya Department of Meteorology University of Nairobi Box 30197-00100 Nairobi Kenya Department of Agricultural Engineering University of Nairobi Box 30197-00100 Nairobi Kenya

In a long term study photosynthetically active radiation was monitored for three rainy seasons to measure the effects of hedgerow intercropping in rotation with maize and cowpea in a senna/siamea and panicum/grass strip on biomass yield and light use efficiency. Maize/cowpea intercropped with senna siamea or grass stripped were compared with sole maize and cowpea. A ceptometer was applied to measure PAR interception by sole maize or cowpea or crop/tree and grass/crop interfaces and separation of PAR used by each plant or tree/grass component. Hedgerow intercropping increased PAR interception and biomass formation. c4 plants had higher LUE than c3 plants while combining c4 and c3 in the agroforestry system lowered LUE. The tree/crop interfaces increased PAR interception than at 1 m and 2 m away from the hedgerow. The row of maize or cowpea at lm intercepted more PAR than the row at 2 m from hedgerow while the cowpea row next to the hedgerow was depressed compared to the rows in the middle rows which had higher yields. The maize or cowpea row next to the grass strip was more stressed than the rows in the middle of the alley.

关键词： Hedgerows intercropping maize/cowpea yield light use efficiency.

激光分子束外延生长LaNiO3薄膜最顶层原子平面的角分辨X-射线光电子谱研究

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量子电子学报 1998年第6期 590-590页

作者：崔大复 P.chen S．Y．Su J．Lin c．k．ong DepartmentofPhysics NationalUniversityofSingapore!Singapore 100080 119260 中国科学院物理研究所光物理实验室和中国科学院凝聚态物理中心!北京

Improving maintenance efficiency and safety through a human-centric approach

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Advances in Manufacturing 2021年第1期9卷 104-114页

作者： c.Y.Siew S.k.ong A.Y.c.Nee Graduate School for Integrative Sciences and Engineering National University of Singapore28 Medical DriveSingapore 117456Singapore Department of Mechanical Engineering National University of Singapore9 Engineering Drive 1Singapore 117576Singapore

This paper presents an adaptive human-machine interface(HMI)that can provide appropriate sets of digital maintenanceinformation and guidance to an operator during *** takes into consideration the expertise level of the operator and the maintenance context and *** proposed human-centric methodology considers the heart rate,intention,and expertise level of the operator,which can be captured using sensors during maintenance.A set of rules is formulated based on the sensor data to infer the state of the operator during a maintenance *** on the operator state,the adaptive HMI can augment the operator's senses using a scheme that combines visual,audio,and haptic guidance cues during maintenance to enhance the operator's ability to perceive information and perform maintenance *** schemes of visual,audio,and haptic cues are developed based on a comparison of the best practices obtained from experienced operators.

关键词： Augmented reality(AR) Ergonomics Product development Maintenance

State-of-the-art survey on digital twin implementations

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Advances in Manufacturing 2022年第1期10卷 1-23页

作者： Y.k.Liu S.k.ong A.Y.c.Nee Department of Mechanical Engineering National University of Singapore9 Engineering Drive 1Singapore 117575Singapore

Digital twin(DT)has garnered attention in both industry and *** advances in big data and internet of things(IoTs)technologies,the infrastructure for DT implementation is becoming more readily *** an emerging technology,there are both potential and *** is a promising methodology to leverage the modern data explosion to aid engineers,managers,healthcare experts and politicians in managing production lines,patient health and smart cities by providing a comprehensive and high fidelity monitoring,prognostics and diagnostics *** research and surveys into the topic are published regularly,as interest in this technology is high although there is a lack of standardization to the definition of a *** to the large amount of information present in a DT system and the dual cyber and physical nature of a DT,augmented reality(AR)is a suitable technology for data visualization and interaction with *** paper seeks to classify different types of DT implementations that have been reported,highlights some researches that have used AR as data visualization tool in DT,and examines the more recent approaches to solve outstanding challenges in DT and the integration of DT and AR.

关键词： Industry 4.0 Internet of thing(IoT) cyberphysical systems Digital twin(DT) Augmented reality(AR)

3D bare-hand interactions enabling ubiquitous interactions with smart objects

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Advances in Manufacturing 2020年第2期8卷 133-143页

作者： S.k.ong X.Wang A.Y.c.Nee Department of Mechanical Engineering Faculty of EngineeringNational University of SingaporeSingapore

Ubiquitous augmented reality(UAR)implementation can benefit smart shop floor operations *** from a user's first-person view can support and provide the user with suitable and comprehensive information without him/her being distracted from ongoing tasks.A natural hand-based interaction interface,namely,a mobile bare-hand interface(MBHI),is proposed to assist a user in exploring and navigating a large amount of information for a task in the user's first-person *** integration of a smart shop floor and UAR-based MBHI is particularly challenging.A real shop floor environment is composed of challenging conditions for the implementation of UAR,e.g.,messy backgrounds and significant changes in illumination ***,the MBHI is required to provide precise and quick responses to minimize the dificulty of a user's *** this study,a wearable UAR system integrated with an MBH is proposed to augment the shop floor environment with smart information.A case study is implemented to demonstrate the practicality and effectiveness of the proposed UAR and MBHI system.

关键词： Augmented reality(AR) Mobile bare-hand interaction(MBH) Smart objects(SOs) Manufacturing shop-floor

AR-assisted robot welding programming

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Advances in Manufacturing 2020年第1期8卷 40-48页

作者： S.k.ong A.Y.c.Nee A.W.W.Yew N.k.Thanigaivel Department of Mechanical Engineering Faculty of EngineeringNational University of SingaporeSingapore

Robotic welding demands high accuracy and ***,robot programming is often a tedious and time-consuming process that requires expert *** paper presents an augmented reality assisted robot welding task programming(ARWP)system using a user-friendly augmented reality(AR)interface that simplifies and speeds up the programming of robotic welding *** ARWP system makes the programming of robot welding tasks more user-friendly and reduces the need for trained programmers and expertise in specific robotic *** AR interface simplifies the definition of a welding path as well as the welding gun orientation,and the system;the system can locate the welding seam of a workpiece quickly and generate a viable welding path based on the user *** developed system is integrated with the touch-sensing capability of welding robots in order to locate the welding path accurately based on the user input,for fillet *** system is applicable to other welding processes and methods of seam *** system implementation is described and evaluated with a case study.

关键词： Augmented reality(AR) Robot programming Welding Seam tracking

Novel AR-based interface for human-robot interaction and visualization

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Advances in Manufacturing 2014年第4期2卷 275-288页

作者： H.c.Fang S.k.ong A.Y.c.Nee Department of Mechanical Engineering Faculty of EngineeringNational University of Singapore9 Engineering Drive 1Singapore 117576Singapore

Intuitive and efficient interfaces for human- robot interaction （HRI） have been a challenging issue in robotics as it is essential for the prevalence of robots supporting humans in key areas of activities. This paper presents a novel augmented reality （AR） based interface to facilitate human-virtual robot interaction. A number of human-virtual robot interaction methods have been for- mulated and implemented with respect to the various types of operations needed in different robotic applications. A Euclidean distance-based method is developed to assist the users in the interaction with the virtual robot and the spatial entities in an AR environment. A monitor-based visualization mode is adopted as it enables the users to perceive the virtual contents associated with different interaction methods, and the virtual content augmented in the real environment is informative and useful to the users during their interaction with the virtual robot. case researches are presented to demonstrate the successful implementation of the AR-based HRI interface in planning robot pick-and-place operations and path following operations.

关键词： Human-robot interaction (HRI) Human-robot interface Augmented reality (AR)

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Mobile augmented reality visualization and collaboration techniques for on-site finite element structural analysis

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International Journal of Modeling, Simulation, and Scientific computing 2018年第3期9卷 2-21页

作者： W.k.Li A.Y.c.Nee S.k.ong NUS Graduate School for Integrative Sciences and Engineering National University of Singapore 28 Medical Drive Singapore 117456Singapore Mechanical Engineering Department National University of Singapore 9 Engineering Drive 1 Singapore 117576Singapore∗mpeneeyc@nus.edu.sg

In this paper,a mobile augmented reality(AR)framework for on-site finite element analysis(FEA)is *** proposed framework is achieved using a client–server *** performance of FEA relies on several important components,namely,computational power,visualization technique,and numerical *** renders intuitive computer-generated contents directly on a user’s *** FEA with AR helps users through enhancing their perception and interaction with the engineering *** and effective visualization of these data using an AR platform can reduce the misinterpretation in spatial and logical *** the past decade,AR has undergone a transition from desktop to phablet *** platforms enable user exploration of FEA results in *** client side uses a hybrid method to visualize FEA results in the mobile AR *** addition,a user can collaborate with other users by using the result sharing function.A prototype with basic functions has been built and a case study has been implemented to demonstrate the visualization method and evaluate the overall performance.

关键词： Augmented reality scientific visualization on-site finite element analysis client-server.