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USING VARIABLE RELUcTANcE AcTUATION IN HIGH-PREcISION MAGNETIc LEVITATED LINEAR MOTORS-A cOMPARISON STUDY

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USING VARIABLE RELUCTANCE ACTUATION IN HIGH-PRECISION MAGNET...

一种基于直线开关磁阻电机的太阳跟踪系统设计(英文)

第二届亚洲机械电子学学术会议

作者： Eduardo Portabella Betrand norbert c.cheung Wai-chuen Gan Institute for Electrical Machines Traction and DrivesTechnical University of BraunschweigGermany Department of Electrical Engineering Hong Kong Polytechnic UniversityHunghomKowloonHong Kong ASM Assembly Automation 15 Kung Yip StreetKwai ChungNTHong Kong

＜正＞This paper assesses the feasibility of using magnetic levitated actuators in high precision linear motion *** arrangement has several advantages over traditional system, including friction-free,minimal maintenance, and the elimination of expensive mechanical propulsion and guidance *** paper first investigates existing technologies of magnetic *** it proposes a new magnetic levitation linear motor structure based on variable reluctance（VR）*** the paper performs simulations on the proposed structure and come out with some very interesting and exciting results.

关键词： Magnetic levitation variable reluctance linear motor high precision

来源： cnki会议评论

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控制理论与应用 2008年第2期25卷 316-320页

作者：张宙赵世伟简伟铨孙振刚郭新展香港理工大学电机工程系中国香港 ASM香港有限公司中国香港特

本文提出了一个采用直线开关磁阻电机作为伺服机构的新颖的太阳跟踪系统.同时也提出了三种控制器配置方案以满足不同需要.按照电磁和机械特性,该太阳跟踪系统可分解为一个电磁子系统和一个机械子系统.整个系统的控制器采用级联控制结构... 详细信息

本文提出了一个采用直线开关磁阻电机作为伺服机构的新颖的太阳跟踪系统.同时也提出了三种控制器配置方案以满足不同需要.按照电磁和机械特性,该太阳跟踪系统可分解为一个电磁子系统和一个机械子系统.整个系统的控制器采用级联控制结构,分别对这两个子系统设计控制器.仿真结果表明了其建模方法和控制器设计的有效性.

关键词：直线开关磁阻电机太阳跟踪无传感器控制

A functional tacrolimus-releasing nerve wrap for enhancing nerve regeneration following surgical nerve repair

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Neural Regeneration Research 2025年第1期20卷 291-304页

作者： Simeon c.Daeschler Katelyn J.W.So Konstantin Feinberg Marina Manoraj Jenny cheung Jennifer Zhang Kaveh Mirmoeini JPaul Santerre Tessa Gordon Gregory HBorschel SickKids Research Institute Neuroscience and Mental Health ProgramTorontoONCanada Institute of Biomaterials and Biomedical Engineering University of TorontoTorontoONCanada Indiana University School of Medicine IndianapolisINUSA Division of Plastic and Reconstructive Surgery the Hospital for Sick ChildrenTorontoONCanada Translational Biology and Engineering Program Ted Rogers Centre for Heart ResearchInstitute of Biomedical EngineeringFaculty of DentistryUniversity of TorontoTorontoONCanada

Axonal regeneration following surgical nerve repair is slow and often incomplete,resulting in poor functional recovery which sometimes contributes to lifelong ***,there are no FDA-approved therapies available to promote nerve *** accelerates axonal regeneration,but systemic side effects presently outweigh its potential benefits for peripheral nerve *** authors describe herein a biodegradable polyurethane-based drug delivery system for the sustained local release of tacrolimus at the nerve repair site,with suitable properties for scalable production and clinical application,aiming to promote nerve regeneration and functional recovery with minimal systemic drug *** is encapsulated into co-axially electrospun polycarbonate-urethane nanofibers to generate an implantable nerve wrap that releases therapeutic doses of bioactive tacrolimus over 31 *** and drug loading are adjustable for applications in small and large caliber nerves,and the wrap degrades within 120 days into biocompatible *** released from the nerve wrap promotes axon elongation in vitro and accelerates nerve regeneration and functional recovery in preclinical nerve repair models while off-target systemic drug exposure is reduced by 80%compared with systemic *** its surgical suitability and preclinical efficacy and safety,this system may provide a readily translatable approach to support axonal regeneration and recovery in patients undergoing nerve surgery.

关键词： biodegradable local drug delivery nerve injury nerve regeneration nerve wrap tacrolimus

Gradient descent decomposition of force-field motor primitives optogenetically elicited for motor mapping of the murine lumbosacral spinal cord

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Zoological Research 2023年第3期44卷 604-619页

作者： Paola Salmas Vincent c.K cheung School of Biomedical Sciences and Gerald Choa Neuroscience InstituteThe Chinese University of Hong KongHong Kong SARChina Kunming Institute of Zoology-The chinese University of Hong Kong(KIZ-cUHK)Joint Laboratory of Bioresources and Molecular Research of common Diseases Hong Kong SARChina

Generating diverse motor behaviors critical for survival is a challenge that confronts the central nervous system(cNS)of all *** movement execution,the cNS performs complex calculations to control a large number of neuromusculoskeletal *** theory of modular motor control proposes that spinal interneurons are organized in discrete modules that can be linearly combined to generate a variety of behavioral *** modules have been previously represented as stimulus-evoked force fields(FFs)comprising isometric limb-endpoint forces across workspace ***,we ask whether FFs elicited by different stimulations indeed represent the most elementary units of motor control or are themselves the combination of a limited number of even more fundamental motor *** probe for potentially more elementary modules,we optogenetically stimulated the lumbosacral spinal cord of intact and spinalized Thy1-chR2 transgenic mice(n=21),eliciting FFs from as many single stimulation loci as possible(20-70 loci per mouse)at minimally necessary *** found that the resulting varieties of FFs defied simple categorization with just a few *** used gradient descent to further decompose the FFs into their underlying basic force fields(BFFs),whose linear combination explained FF *** mice,we identified 4-5 BFFs with partially localizable but overlapping representations along the spinal *** BFFs were structured and topographically distributed in such a way that a rostral-to-caudal traveling wave of activity across the lumbosacral spinal cord may generate a swing-to-stance gait *** BFFs may represent more rudimentary submodules that can be flexibly merged to produce a library of motor modules for building different motor behaviors.

关键词： Motor mapping Optogenetics Spinal cord Motor primitives Traveling wave

Evolving treatment landscape for early and advanced pancreatic cancer

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World Journal of Gastrointestinal Oncology 2017年第7期9卷 281-292页

作者： Sally c Lau Winson Y cheung Division of Medical Oncology University of British Columbia British Columbia Cancer Agency Department of Oncology University of Calgary Tom Baker Cancer Center

Pancreatic ductal adenocarcinoma is an infrequent cancer with a high disease related mortality rate, even in the context of early stage disease. Until recently, the rate of death from pancreatic cancer has remained largely similar whereby gemcitabine monotherapy was the mainstay of systemic treatment for most stages of disease. With the discovery of active multiagent chemotherapy regimens, namely FOLFIRINOX and gemcitabine plus nab-paclitaxel, the treatment landscape of pancreatic cancer is slowly evolving. FOLFIRINOX and gemcitabine plus nab-paclitaxel are now considered standard first line treatment options in metastatic pancreatic cancer. Studies are ongoing to investigate the utility of these same regimens in the adjuvant setting. The potential of these treatments to downstage disease is also being actively examined in the locally advanced context since neoadjuvant approaches may improve resection rates and surgical outcomes. As more emerging data become available, the management of pancreatic cancer is anticipated to change significantly in the coming years.

关键词： cancer Neoplasm Pancreas Adjuvant treatment Systemic treatment Gemcitabine FOLFIRINOX Nab-paclitaxel

A survey on dependability improvement techniques for pervasive computing systems

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Science china(Information Sciences) 2015年第5期58卷 19-32页

作者： YANG WenHua LIU YePang XU chang cheung S.c. State Key Laboratory for Novel Software Technology Nanjing University Department of computer Science and Technology Nanjing University Department of computer Science and Engineering The Hong Kong University of Science and Technology

The goal of this survey is to summarize the state-of-the-art research results and identify research challenges of developing and deploying dependable pervasive computing systems. We discuss the factors that affect the system dependability and the studies conducted to improve it with respect to these factors. These studies were categorized according to their similarities and differences in hope of shedding some insight into future research. There are three categories: context management, fault detection, and uncertainty *** three categories of work address the three most difficult problems of pervasive computing systems. First,pervasive computing systems’ perceived environments, which are also called their contexts, can vary intensively,and thus have a great impact on the systems’ dependability. Second, it is challenging to guarantee the correctness of the systems’ internal computations integrated with interactions with external environments for *** detection is then an important issue for improving dependability for these systems. Last but not least importantly, pervasive computing systems interact with their environments frequently. These interactions can be affected by many uncertainties, which can jeopardize the systems’ dependability. After a discussion of these pieces of work, we present an outlook for its future research directions.

关键词： pervasive computing system dependability context fault detection uncertainty

Treasures in insect collections:the future of the bomb-radiocarbon analysis

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Insect Science 2018年第6期25卷 1128-1131页

作者： norbert Kunert Alida Mercado cárdenas Biogeochemical Processes Max-Planck-lnsUtute for BiogeochemistryHans-Knoll-Str.10JenaGermany chair of Silviculture Universitɑt FreiburgTennenbacherstr.4FreiburgGermany

Dear Editor, Bomb-radiocarbon analysis of modern carbon has been applied in many fields of *** method allows de- terrnining the residence time of carbon in photosynthetic products and thus aU organic matter in *** atmospheric 14c signature will soon drop below the pre- bomb level due to fixation of atmospheric carbon in ter- restrial and marine ecosystems and high rates of lac-free fossil fuel ***,the time is running out for bomb-radiocarbon *** collections shelter an immense quantity of specimens stored in *** show how those specimens can be used for exploring the trophic structure of food webs by comparing their isotopic radiocarbon signature.

关键词： INSEcT collection & preservation cARBON isotopes

Laser Induced Fluorescence Spectroscopy of IrN

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chinese Journal of chemical Physics 2009年第2期22卷 157-161页

作者： H. F. Pang A. S. c. cheung Department of chemistry The University of Hong Kong Pokfulam Road Hone Kong China

High resolution laser induced fluorescence, spectra of IrN in the spectral region between 394 and 520 nm were recorded using laser vaporization/reaction free jet expansion and laser induced fluorescence spectroscopy. Seven new vibronic transition bands were observed and analyzed. Two Ω=1 and five Ω=0 new states were identified. Least squares fit of rotationally resolved transition lines yielded accurate molecular constants for the upper states. Spectra of isotopic molecules were observed, which provided confirmation for the vibrational assignment. comparison of the observed electronic states of IrB, Irc, and IrN provides a good understanding of the chemical bonding of this group of molecules.

关键词： Electronic transition Rotational analysis Iridium mononitride Laser induced fluorescence spectroscopy

BLOSSOMS： Building Lightweight Optimized Sensor Systems on aMassive Scale

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Journal of computer Science & Technology 2005年第1期20卷 105-117页

作者： WenGao LionelM.Ni Zhi-WeiXu S.c.cheung Licui QiongLuo InstituteofcomputingTechnology ChineseAcademyofSciencesBeijing100080P.R.China DepartmentofcomputerScience TheHongKongUniversityofScienceandTechnologyClearWaterBayKowloonHongKongSpecialAdministrativeRegionP.R.China

As a joint effort between the chinese Academy of Sciences and the Hong KongUniversity of Science and Technology, the BLOSSOMS sensor network project aims to identify researchissues at all levels from practical applications down to the design of sensor nodes. In thisproject, a heterogeneous sensor array including different types of application-dependent sensors aswell as monitoring sensors and intruding sensors are being developed. Application-dependentpower-aware communication protocols are also being studied for communications among sensor nodes. Anontology-based middleware is built to relieve the burden of application developers from collecting,classifying and processing messy sensing contexts. This project is also developing a set of toolsallowing researchers to model, simulate/emulate, analyze, and monitor various functions of sensornetworks.

关键词： sensor network sensor node communication protocol middleware networksimulation network monitor