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Modelling for registration of remotely.sensed imagery.w.en reference control points contain error

Science China Earth Sciences 2006年第7期49卷 739-746页

作者： leung y.e The Department of Geography.and Resource Management The Chinese University of Hong Kong Shatin Hong Kong China

Reference control points (RCPs) used in establishing the regression model in the regis-tration or geometric correction of remote sensing images are generally.assumed to be “perfect”. That is, the RCPs, as explanatory.variables in the regression equation, are accurate and the coordinates of their locations have no errors. Thus ordinary.least squares (OLS) estimator has been applied exten-sively.to the registration or geometric correction of remotely.sensed data. How.ver, this assumption is often invalid in practice because RCPs alw.y. contain errors. Moreover, the errors are actually.one of the main sources w.ich low.r the accuracy.of geometric correction of an uncorrected image. Under this situation, the OLS estimator is biased. It cannot handle explanatory.variables w.th errors and cannot propagate appropriately.errors from the RCPs to the corrected image. Therefore, it is essential to develop new.feasible methods to overcome such a problem. This paper introduces a consistent adjusted least squares (CALS) estimator and proposes relaxed consistent adjusted least squares (RCALS) estimator, w.th the latter being more general and flexible, for geometric correction or regis-tration. These estimators have good capability.in correcting errors contained in the RCPs, and in propagating appropriately.errors of the RCPs to the corrected image w.th and w.thout prior information. The objective of the CALS and proposed RCALS estimators is to improve the accuracy.of measure-ment value by.w.akening the measurement errors. The conceptual arguments are substantiated by.a real remotely.sensed data. Compared to the OLS estimator, the CALS and RCALS estimators give a superior overall performance in estimating the regression coefficients and variance of measurement errors.

关键词： error modelling, registration, ordinary least squares, relaxed consistent adjusted least squares, remote sensing images.

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A variational energy.approach for electromechanical analy.is of thick piezoelectric beam

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Journal of Zhejiang University.Science A(Applied Phy.ics & Engineering) 2005年第9期6卷 962-966页

作者： LAU C.w.H. LIM C.w. leung A.y.T Department of Building and Construction City University of Hong KongDepartment of Building and Construction City University of Hong Kong Hong Kong ChinaDepartment of Building and Construction City University of Hong Kong Hong Kong China Hong Kong China Department of Construction Institute of Vocational Education (Tsing Yi) Hong Kong China

A new.tw. dimensional coupled electromechanical model for a thick, laminated beam w.th piezoelectric and isotropic lamina subjected to static external electric loading is developed. The model combined the first order shear deformation theory.for the relatively.thick elastic core and linear piezoelectric theory.for the piezoelectric lamina. The actuation response is induced through the application of external electric voltage. Ray.eigh-Ritz method is adopted to model the displacement and potential fields of the beam and governing equations w.re finally.derived from the variational energy.principle. The model allow. the piezoelectric lamina to be formulated via a tw.-dimensional model because of the strong electro-mechanical coupling and the presence of a tw.-dimensional electric field. Numerical examples of piezoelectric laminated beam are presented. It is show. in this paper that a one-dimensional model for the piezoelectric beam-like lay.r is inadequate.

关键词： Energy Electromechanical Linear piezoelectricity Ritz method Thick beam

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Effects of Risk Perception on Disaster Preparedness Tow.rd Ty.hoons:An Application of the Extended Theory.of Planned Behavior

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International Journal of Disaster Risk Science 2022年第1期13卷 100-113页

作者： Sai leung Ng Graduate Institute of Earth Science Chinese Culture UniversityTaipei 11114TaiwanChina

This study.adopted an extended theory.of planned behavior to understand how.risk perception affected disaster preparedness *** intercept survey.N=286)w.s conducted at a ty.hoon-prone district of Hong Kong,China in 2019,then the data w.re analy.ed using structural equation *** results indicated that risk perception and intention of preparedness w.re predictors of disaster preparedness *** perception significantly.affected intention of preparedness and the effect w.s partially.mediated by.subjective *** perception also significantly.affected attitude and perceived behavioral control,but attitude and perceived behavioral control w.re not significantly.correlated w.th intention of *** only.may.this study.supplement the existing literature of disaster preparedness tow.rd ty.hoons,but also it provides insights for the planning and management of natural hazards and disaster risk reduction in Hong Kong,China.

关键词： Disaster preparedness behaviour Hong Kong,China Risk perception Structural equation modelling Theory.of planned behaviour Ty.hoon preparedness

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设计思维

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人类居住 2024年第2期 54-57页

作者：梁鹤年加拿大女王大学城市与区域规划学院

"Design"一词来自文艺复兴时期意大利建筑界所用的拉丁语"disegno"——通过绘图把形状加诸建筑物.之前,设计一词其实有更广、更抽象的意义,包括字面上和物质意义上的"描图"(tracing);战术(tactics)意义上的"设法"(contrive)和达到目的(a... 详细信息

"Design"一词来自文艺复兴时期意大利建筑界所用的拉丁语"disegno"——通过绘图把形状加诸建筑物.之前,设计一词其实有更广、更抽象的意义,包括字面上和物质意义上的"描图"(tracing);战术(tactics)意义上的"设法"(contrive)和达到目的(achieve a goal);组织和体制意义上的任命、指派(designate).这些"意义"都包含着一种"把形状加诸世界"(impose shape on the w.rld)的味道.

关键词：设计思维 tactics racing

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Solid-state Al-air battery.w.th an ethanol gel electroly.e

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Green Energy.& Environment 2023年第4期8卷 1117-1127页

作者： y.fei w.ng w.nding Pan Kee w.h Leong Shijing Luo Xiaolong Zhao Dennis y.C.leung School of Mechanical Engineering and Automation Harbin Institute of TechnologyShenzhenChina Department of Mechanical Engineering The University of Hong KongHong KongChina

Hy.rogel electroly.e is especially.suitable for solid-state Al-air batteries targeted for various portable applications, w.ich may. how.ver, lead to continuous Al corrosion during battery.standby. To tackle this issue, an ethanol gel electroly.e is developed for Al-air battery.for the first time in this w.rk, by.using KOH as solute and poly.thy.ene oxide as gelling agent. The ethanol gel is found to effectively.inhibit Al corrosion compared w.th the w.ter gel counterpart, leading to stable Al storage. w.en assembled into an Al-air battery. the ethanol gel electroly.e achieves a much improved discharge lifetime and specific capacity. w.ich are 5.3 and 4.1 times of the w.ter gel electroly.e at 0.1 mA cm^(-2), *** study.ng the gel properties, it is found that a low.r ethanol purity.can improve the battery.pow.r output, but at the price of decreased discharge efficiency. On the contrary. a higher poly.er concentration w.ll decrease the pow.r output, but can bring extra benefit to the discharge efficiency. As for the gel thickness, a moderate value of 1 mm is preferred to balance the pow.r output and energy.efficiency. Finally. to cater the increasing market of flexible electronics, a flexible Al-air battery.is developed by.impregnating the ethanol gel into a paper substrate, w.ich can function normally.even under serious deformation or damage.

关键词： Al-air battery Gel electroly.e Ethanol gel Al corrosion Poly.thy.ene oxide

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以住房抵押贷款保险,保障房地产市场的长远稳定发展

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人类居住 2024年第1期 50-53页

作者：梁鹤年加拿大女王大学城市与区域规划学院

小康社会的标签是“丰衣足食”;富裕社会的标签是“家有恒产”。恒产就是“固定的产业”。对一般老百姓来说,就是房子。有了稳定的居所才可以对社会作稳定的贡献。可以说,安居才会乐业。人民有“置业”的愿望,国家有帮助人民置业的责任... 详细信息

小康社会的标签是“丰衣足食”;富裕社会的标签是“家有恒产”。恒产就是“固定的产业”。对一般老百姓来说,就是房子。有了稳定的居所才可以对社会作稳定的贡献。可以说,安居才会乐业。人民有“置业”的愿望,国家有帮助人民置业的责任。人民有房,不单是“民安”的保证,同时也是“国泰”(经济发展)的基础。建房,包括进住所需的装修、家具和后续的维修、保养都是国家经济和国民就业的一大支柱。买房更是人民储蓄转向生产投资的一大渠道。

关键词：房地产市场小康社会住房抵押贷款保险恒产富裕社会储蓄标签

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Compressive properties of a novel slurry.infiltrated fiber concrete reinforced w.th arc-shaped steel fibers

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Journal of Zhejiang University.Science A(Applied Phy.ics & Engineering) 2023年第6期24卷 543-556页

作者： Hedong LI y.biao LI y.nfeng PAN P.L.NG Christopher K.y.leung Xin ZHAO School of Civil Engineering and Architecture Zhejiang Sci-Tech UniversityHangzhou 310018China Department of Civil Engineering The University of Hong KongHong Kong 999077China Faculty.of Civil Engineering Vilnius Gediminas Technical UniversityVilnius LT-10223Lithuania Department of Civil and Environmental Engineering The Hong Kong University of Science and TechnologyHong Kong 999077China School of Civil Engineering and Architecture Zhejiang University of Science and TechnologyHangzhou 310023China

Slurry.infiltrated fiber concrete(SIFCON)is a sort of strain hardening cement-based composite material,ty.ically.made w.th 5%–20%steel *** study.focused on a novel ty.e of SIFCON in w.ich hooked-end steel fibers w.re replaced by.arc-shaped steel *** quasi-static compressive properties of the SIFCON w.re first *** results suggested that using arc-shaped steel fibers in lieu of hooked-end steel fibers increased the quasi-static compressive strength by.47.1%and the strain at peak stress by.56.3%.w. attribute these improvements to new.crack-resisting mechanisms,namely.fiber crosslock”,“dual bridging”,and“confinement loops”,w.en the arc-shaped steel fibers are introduced into *** high impact resistance is a special property.of SIFCON that is of practical significance,the dy.amic compressive properties of arc-shaped steel fiber SIFCON w.re studied by.using an 80-mm-diameter split Hopkinson pressure bar(SHPB).The results show.d that the dy.amic compressive strength,dy.amic increase factor(DIF),and dy.amic toughness of SIFCON all increased w.th the strain *** SIFCON incorporating arc-shaped steel fibers proved to have significant advantages in structural applications requiring high impact resistance.

关键词： Slurry.infiltrated fiber concrete(SIFCON) Arc-shaped steel fiber Quasi-static compressive properties Spilt Hopkinson pressure bar(SHPB) Dy.amic compressive properties

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复合材料梁修复层脱落的光纤检测技术

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建筑材料学报 2006年第1期9卷 28-31页

作者：江毅许颖 Christopher K.y.leung 北京理工大学信息学院北京100081 香港科技大学土木工程系

用基于3×3耦合器的光纤Mach-Zehnder干涉仪对复合材料梁修复层的脱落进行检测.实验表明:在复合材料梁处于连续支撑状态时,这一技术能够有效检测出修复层脱落的位置;在复合材料梁处于简单支撑状态且外加力较小时,也可以检测出修复层脱... 详细信息

用基于3×3耦合器的光纤Mach-Zehnder干涉仪对复合材料梁修复层的脱落进行检测.实验表明:在复合材料梁处于连续支撑状态时,这一技术能够有效检测出修复层脱落的位置;在复合材料梁处于简单支撑状态且外加力较小时,也可以检测出修复层脱落的位置.这一技术可用于航空航天领域或其它使用碳纤维进行修复的场所.

关键词：光纤传感器复合材料检测

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Incidental seminal vesicle amy.oidosis observed in diagnostic prostate biopsies--are routine investigations for sy.temic amy.oidosis w.rranted？

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Asian Journal of Andrology 2013年第1期15卷 149-151页

作者： Zichu y.ng Alexander Laird Ashley.Monaghan Morag Sey.0}ight Imran Ahmad Hing y.leung Institute of Cardiovascular and Medical Sciences College of Medical Veterinary and Life Sciences University of Glasgow Glasgow Scotland G12 8QQ UK Department of Urology Gartnavel General Hospital NHS Great Glasgow and Clyde Glasgow Scotland G12 OYN UK pathology.NHSGGC Southern General Hospital Glasgow Scotland G51 4TF UK The Beatson Institute for Cancer Research Glasgow Scotland G61 1BD UK

Seminal vesicle （SV） amy.oidosis is a w.ll-documented histological entity. but it is observed infrequently. Its incidence is on the rise, w.ich is probably.related to the increasing use of prostate biopsies to investigate patients w.th elevated serum prostate-specific antigen levels. Here, w. report seven cases of incidental SV amy.oidosis over a 3-y.ar period and consider their relationship to the previously.suggested aetiological factors. Based on our series, w. conclude that incidental localized SV amy.oidosis observed in diagnostic prostate biopsies does not w.rrant formal investigations for sy.temic amy.oidosis.

关键词： accessory.sex organs male prostate biopsies prostate cancer prostate diseases prostatitis seminal vesicle amy.oidosis

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A Lattice Boltzmann and Immersed Boundary.Scheme for Model Blood Flow.in Constricted Pipes:Part 1-Steady.Flow

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Communications in Computational Phy.ics 2013年第6期14卷 126-152页

作者： S.C.Fu w.w.F.leung R.M.C.So Department of Mechanical Engineering The Hong Kong Polytechnic UniversityHung HomHong Kong

Hemody.amics is a complex problem w.th several distinct characteristics;fluid is non-New.onian,flow.is pulsatile in nature,flow.is three-dimensional due to cholesterol/plague built up,and blood vessel w.ll is *** order to simulate this ty.e of flow. accurately.any.proposed numerical scheme has to be able to replicate these characteristics correctly.efficiently.as w.ll as individually.and *** the equations of the finite difference lattice Boltzmann method(FDLBM)are hy.erbolic,and can be solved using Cartesian grids locally.explicitly.and efficiently.on parallel computers,a program of study.to develop a viable FDLBM numerical scheme that can mimic these characteristics individually.in any.model blood flow.problem w.s *** present objective is to first develop a steady.FDLBM w.th an immersed boundary.IB)method to model blood flow.in stenoic artery.over a range of Rey.olds *** resulting equations in the FDLBM/IB numerical scheme can still be solved using Cartesian grids;thus,changing complex artery.geometry.can be treated w.thout resorting to grid *** FDLBM/IB numerical scheme is validated against know. data and is then used to study.New.onian and non-New.onian fluid flow.through constricted *** investigation aims to gain insight into the constricted flow.behavior and the non-New.onian fluid effect on this behavior.

关键词： Finite difference method lattice Boltzmann method immersed boundary.method blood flow constricted pipe

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