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Zinc-oxide/PDMS-clad tapered fiber saturable absorber for passively mode-locked erbium-doped fiber laser

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Chinese Physics B 2021年第5期30卷 384-389页

作者： F D Muhammad S A S Husin E k Ng k y lau C A C Abdullah M A Mahdi Department of Physics Faculty of ScienceUniversiti Putra Malaysia43400 UPM SerdangSelangorMalaysia Wireless and Photonics Networks Research Centre Faculty of EngineeringUniversiti Putra Malaysia43400 UPM SerdangSelangorMalaysia Department of Electronics and Nanoengineering Tietotie 3Aalto University02150 EspooFinland

We propose and demonstrate a passively mode-locked erbium-doped fiber laser(EDFL)based on zinc-oxide/polydimethylsiloxane(ZnO/PDMS)saturable absorber(SA)that evanescently interacts with the light on a tapered *** ZnO/PDMS composite is coated on the whole surface of the tapered fiber to guarantee the maximum efficiency of the SA device,with a measured insertion loss of 0.87 dB and a modulation depth of 6.4%.The proposed laser can generate soliton mode-locking operation at a threshold power of 33.07 *** generated output pulse yields a repetition rate and pulse width of 9.77 MHz and 1.03 ps,*** results indicate that the proposed ZnO/PDMS-clad tapered fiber could be useful as an efficient,compatible,and low-cost SA device for ultrafast laser applications.

关键词： zinc-oxide saturable absorber tapered fiber mode-locked fiber laser

纳米二氧化硅填料量对LDPE复合材料局部放电特性的影响(英文)

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高电压技术 2011年第11期37卷 2629-2635页

作者： Z.Abdul-Malek A.M.Azzin y.Z.Arief Aulia k.y.lau M.Jaafar UTM Institute of High Voltage & High Current Universiti Teknologi MalaysiaMalaysia School of Materials & Mineral Resources Engineering Universiti Sains MalaysiaMalaysia

Partial discharges(PDs) due to artificial void in samples of LDPE nanocomposite sheet have been investigated in this *** may cause the degradation of insulating materials and may affect the lifetime of high-voltage apparatus. An experimental work using sphere ball-plane electrode system(CIGRE MethodⅡ) and a 1.0 mm LDPE composite sheet was carried *** weight percentages of nanosilica(0%,2%,4%,6%and 8%) were used. PD experimental results,such as PD magnitude and PD number(both PD pulse polarities),as functions of the applied stress duration at a specified applied voltage were *** surface morphology of specimens was also presented and this conforms to the PD *** experimental results show that the PD characteristics of the LDPE generally improve with the introduction of nanosilica,the composite with the highest content of filler,namely the 8%(wt) nanosilica sample has the least partial discharge activities.

关键词： LDPE nanocomposite nanosilica partial discharges

DEMONSTRATING OF ENVIRONMENTAL CHEMISTRy WITH CASE STUDIES （HAND-ON WORkSHOP）

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DEMONSTRATING OF ENVIRONMENTAL CHEMISTRY WITH CASE STUDIES ...

作者： Ruth W.y.Chu April k.y.lau Department of Chemistry Hong Kong Baptist University224 Waterloo RoadKowloon TongHong Kong SAPChina Department of Chemistry Hong Kong Baptist University224 Waterloo RoadKowloon TongHong Kong SAPChina

＜正＞ Environmental chemistry has become an integral part of chemistry curriculum not only in Universities and Colleges, but also in high schools. The design of curriculum with well coverage in important aspects of environmental chemistry has been attracted a wide attention from the education community. Moreover, it has been suggested that students cannot gain an adequate appreciation of

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A Cooperative Autonomous Mechatronic System for Fault Tolerant Control of Material Handling Operations

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A Cooperative Autonomous Mechatronic System for Fault Tolera...

第11届粤港机械电子工程技术与应用研讨会

作者： Raymond C.M.Chan Henry y.k.lau Department of Industrial and manufacturing Systems Engineering The University of Hong kong Pokfulam Road Hong KongPRC

＜正＞Sustainable control of a cooperative autonomous mechatronic system is a challenging undertaking and it is one of the focuses which many researchers have been working on for *** this paper,we introduce the design of an immune-inspired decentralized sustainability control methodology for cooperative autonomous mechatronic system such as multi-agent systems （MAS） to optimize the overall performance in terns of longevity through the trade-off between maintenance activity and task *** resulting system will have favorable characteristics of good fault tolerant as well as task achievement.A design of a multi-robot system that is amenable for the experimentation of the proposed methodology is presented together with a simulation platform for investigating its performance.

关键词： multi-agent system artificial immune systems robotic control

A Control Model for Automated Assembly Systems with a Multi-agent Architecture

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A Control Model for Automated Assembly Systems with a Multi-...

第十九届中国控制会议

作者： H．y．k．lau k．L．Mak I．S．k．Lee Department of Industrial and Manufacturing Systems Engineering The University of Hong KongPokfulamHong Kong Department of Industrial and Manufacturing Systems Engineering The University of Hong KongPokfulamHong Kong Department of Industrial and Manufacturing Systems Engineering The University of Hong KongPokfulamHong Kong

＜正＞A multi-agent architecture is proposed to model assembly systems. Under this paradigm every workcell within an assembly system is modeled as an agent with the same abstract architecture. This architecture follows a layered approach in which the lowest level models the most primitive actions of the workcell. Another layer is added on top of it to control its primitive actions so as to achieve a goal, which in turn is generated by yet another layer. Each agent is incorporated into it a top most co-operative layer through which the communication and co-ordination among agents are modeled. In pursuing this approach, each agent is capable of controlling and planning its local actions in order to fulfill the goal generated by the co-operative layer. Therefore, a tremendous amount of workload associated with planning, error detection, diagnosis and recovery is distributed to the local agent.

关键词： Manufacturing systems agent architecture multi-agent system system modeling

A Stochastic Model for the Control of Intelligent Assembly Robots

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A Stochastic Model for the Control of Intelligent Assembly R...

第十九届中国控制会议

作者： k．L．Mak H．y．k．lau M．C．C．Ngan Department of Industrial and Manufacturing Systems Engineering The University of Hong kong Pokfulam RoadHong Kong Department of Industrial and Manufacturing Systems Engineering The University of Hong kong Pokfulam RoadHong Kong Department of Industrial and Manufacturing Systems Engineering The University of Hong kong Pokfulam RoadHong Kong

＜正＞The topic of automated assembly is widely addressed by the robotics communities. However, so far there is no systematic framework to assist the construction of an intelligent robot control system. Even systems so called intelligent systems are not truly intelligent when they are compared to human. It is therefore essential to define and analyse the necessary intelligence criteria that an intelligent robot should posses. Such criteria are then implemented on an appropriate control platform so as to enhance the intelligence of the robot. As such, one of the principal aims of this paper is to discuss and identify the criteria of machine intelligence that are central to achieving an intelligent robot. With these criteria as basis, the paper then presents an intelligent framework that is based on the stochastic hidden Markov model （HMM）. This framework consists of a number of functional blocks for the design and implementation of an intelligent robot control system. Each functional block is responsible for a corresponding feature with specific intelligent capabilities. The paper starts with a review of the applications of HMM in automated assembly, which is followed by the description of the main features and architecture of the proposed framework.

关键词： Hidden Markov models intelligent robots control systems architecture force control

Mindfulness Facets and Psychological Well-Being among Meditators:Serenity as a Mediating Process

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International Journal of Mental Health Promotion 2024年第3期26卷 177-187页

作者： Rebecca y.M.Cheung Iris yili Wang Elsa Ngar-Sze lau School of Psychology and Clinical Language Sciences University of ReadingReadingUK Department of Special Education and Counselling The Education University of Hong KongHong KongChina Department of Educational Administration and Policy The Chinese University of Hong KongHong KongChina

Guided by the theoretical processes of mindfulness and psychological well-being,this study examined serenity as a mediator between mindfulness facets and psychological well-being,as indexed by depressive symptoms and life *** were 133 mindfulness practitioners who took part in a 3-day transnational meditation event in Hong *** informed consent,participants completed a self-report *** findings from structural equation modeling showed that serenity mediated the relation between two facets of mindfulness,including describing and nonreacting to inner experience,and life *** also mediated the relation between the mindfulness facet of describing and depressive *** associations were indicated between two mindfulness facets,including observing and nonjudging of inner experience,and depressive *** together,the findings revealed mindfulness facets as major correlates of serenity and psychological outcomes among Chinese meditation *** foster psychological well-being,researchers,educators,and practitioners should pay attention to the role of serenity,describing,and nonreacting to inner experience in mental health.

关键词： Depressive symptoms mindfulness mindfulness practitioners satisfaction with life serenity

Net effect of air pollution controls on health risk in the Beijing-Tianjin-Hebei region during the 2022 winter Olympics and Paralympics

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Journal of Environmental Sciences 2024年第1期135卷 560-569页

作者： Changqing Lin Peter k.k.Louie Alexis k.H.lau Jimmy C.H.Fung Zibing yuan Minghui Tao Xuguo Zhang Md.Shakhaoat Hossain Chengcai Li Xiang Qian Lao Division of Environment and Sustainability The Hong Kong University of Science and TechnologyHong KongChina Environmental Protection Department Hong Kong Government SARHong KongChina Department of Civil and Environmental Engineering The Hong Kong University of Science and TechnologyHong KongChina Guangdong-Hongkong-Macao Joint Laboratory of Collaborative Innovation for Environmental Quality The Hong Kong University of Science and TechnologyHong KongChina Department of Mathematics The Hong Kong University of Science and TechnologyHong KongChina School of Environment and Energy South China University of TechnologyGuangzhou 510006China Hubei key Laboratory of Critical Zone Evolution School of Geography and Information EngineeringChina University of GeosciencesWuhan 430074China Department of Public Health and Informatics Jahangirnagar UniversityDhaka 1342Bangladesh Department of Atmospheric and Oceanic Sciences School of PhysicsPeking UniversityBeijing 100871China Jockey Club School of Public Health and Primary Care The Chinese University of Hong KongHong KongChina

Due to the non-linearity in ozone(O_(3))formation,reducing the emission of nitrogen oxides(NO_(x))may increase O_(3) *** the counteractive O_(3) response to NO_(x) reduction,overall impact of air pollution controls can be ambiguous when the assessments focus on the changes in pollutant *** this study,a risk-based method was used to gauge the net effect of air pollution controls on mortality risk in the Beijing–Tianjin–Hebei(BTH)region during the 2022 Winter Olympics and Paralympics(WOP).This mega-event presents a unique opportunity to investigate the efficacy of deep cuts in pollutant *** show that O_(3) concentrations greatly increased as nitrogen dioxide(NO_(2))concentrations decreased in the *** to the active photochemical formations,O_(3) became the dominant pollutant that affected human health during the *** the substantial O_(3) increases,the health benefits of NO_(2) reductions overwhelmed the adverse health effects of O_(3) increases in most regions of the BTH(at 81 out of 112 stations).After considering the impacts of particulate matter,the integrated health risk of air pollution mixtures declined almost everywhere in the *** results underscore the great necessity of changing the assessment paradigm of pollution control from using concentration-based methods to using risk-based *** with the carbon neutrality policy,stringent control of NO_(x)emission from combustion sources is a promising way to achieve synergistic control solutions for air pollution and climate change.

关键词： Ozone Nitrogen dioxide Health risk Carbon neutrality Mega-events

所知障(jeyāvarana)是无明(avidyā)或无知(ajāna)?——以印—藏中观学为例

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复旦学报（社会科学版） 2016年第1期58卷 63-75页

作者：刘宇光复旦大学哲学学院上海200433

所知障(jeyāvarana)是区分大、小乘佛教的义理标志之一,所以无论是梵、藏、汉的唯识学、中观学和如来藏—佛性说,基本上都承认并重视此说,尽管在细节的诠释上,还是各有差异。不同诠释之间的一个重要差异,是本文探讨的所知障的体性何... 详细信息

所知障(jeyāvarana)是区分大、小乘佛教的义理标志之一,所以无论是梵、藏、汉的唯识学、中观学和如来藏—佛性说,基本上都承认并重视此说,尽管在细节的诠释上,还是各有差异。不同诠释之间的一个重要差异,是本文探讨的所知障的体性何属,这是指以下子题:一、所知障的性质染、非染孰是?二、所知障若为污染,是哪一个意义下的污染,与无明和不染无知之间是什么关系?关键是它会否导致无明与流转?三、所知障体性和大、小乘佛教宗教原景的差别的关系是什么?本文沿着以月称为主要代表之一的中期印度中观学,到以宗喀巴和格鲁派为代表之一的藏传教派中观所形成的脉络为案例,探讨印—藏中观学对所知障体性等相关议题的观点,其间亦稍与东亚有相唯识学作对照。讨论的线索是沿着相似但不相同的一对概念展开,即梵文的无明(avidyā)和无知(ajāna),并延伸至不染无明(aklistaavidyā)和不染无知(aklista-ajāna),乃至这四个词的相应藏文翻译。本文在与东亚有相唯识学所知障的简要对照下,辨别出无明和无知两列概念在所知障体性问题上的判断分歧,并依此深化对所知障的理解。论文由四节组成:一、据月称《入中论》藏译本及早期格鲁派中观师如宗喀巴在《入中论善显密意疏》的篇章,说明其观点;二、据格鲁派中期代表人物之一第二世嘉木样的《宗义宝鬘》,探讨宗义书所涉诸宗义的不同说明;三、考察格鲁派之外藏传佛教的其他教派中观学对不染无明的态度;四、中期格鲁派另一学者第一世嘉木样对既有藏传观点的疑惑。

关键词：所知障无明无知不染无明不染无知