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Modeling of cable vibrat.on effect. of cable-st.yed bridges

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Eart.quake Engineering and Engineering Vibrat.on 2002年第1期1卷 74-85页

作者： S.H.Cheng David t.lau Depart.ent.of Civil and Environment.l Engineering Carleton UniversityOttawaOntarioCanadaPost-doctoral fellow Depart.ent.of Civil and Environment.l Engineering Carleton UniversityOttawaOntarioCanada Professor

t.e analysis of dynamic responses of cable-st.yed bridges subject.d t. wind and eart.quake loads generally considers only t.e mot.ons of t.e bridge deck and *** influence of t.e st.y cable vibrat.on on t.e responses of t.e bridge is eit.er ignored or considered by approximat. *** t.ansverse vibrat.on of t.e st.y cables,which can be significant.in some cases,are usually neglect.d in previous *** t.e present.st.dy,a new t.ree-node cable element.has been developed t. model t.e t.ansverse mot.ons of t.e *** int.ract.ons bet.een t.e cable behavior and t.e ot.er part. of t.e bridge superst.uct.re are considered by t.e concept.of dynamic *** nonlinear effect.of t.e cable caused by it. self-weight.is included in t.e *** examples are present.d t. demonst.at. t.e accuracy and efficiency of t.e proposed model. t.e impact.of cable vibrat.on behavior on t.e dynamic charact.rist.cs of cable-st.yed bridges is discussed.

关键词： cable-st.yed bridges cable vibrat.on dynamics finit. element. long-span st.uct.res

A populat.on st.dy of fast.ng t.me and serum prost.t.-specific ant.gen （PSA） level

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Asian Journal of Andrology 2014年第5期16卷 740-744,I0009,I0010页

作者： Cheryl K lau Maggie Guo Jeannine A Viczko Christ.pher t.Naugler Calgary Laborat.ry Services Calgary Department of Family Medicine University of Calgary Calgary Canada Depart.ent.of Pat.ology and Laborat.ry Medicine Department of Family Medicine University of Calgary Calgary Canada

Prost.t. cancer is one of t.e most.common cancers in men. t.adit.onal screening and diagnost.c met.ods include digit.l rect.l examinat.ons （DREs）, biopsies and serum prost.t.-specific ant.gen （PSA） t.st., wit. t.e lat.er being t.e more popular. PSA is a biomarker for prost.t. cancer; however, it.is highly sensit.ve t. ext.rnal fact.rs as well as ot.er prost.t. diseases. As such, t.e reliabilit. of of t.e serum PSA level as a sole screening and diagnost.c t.ol for prost.t. cancer is cont.oversial. Recent.y, it.has been shown t.at.fast.ng ext.emes can affect.concent.at.ons of serum chemist.y analyt.s, t.us raising t.e quest.on of whet.er or not.fast.ng has an effect.on t.e highly sensit.ve PSA biomarker. Pat.ent. t.st.ng for serum PSA levels are oft.n concomit.nt.y submit.ing t. ot.er t.st. t.at.require fast.ng, subject.ng cert.in pat.ent. t. a fast.ng PSA level while ot.ers not. t.e object.ve of t.is st.dy was t. invest.gat. whet.er t.is discrepancy in fast.ng st.t. t.anslat.s int. an effect.on serum PSA levels. Serum PSA levels and fast.ng t.me records for 157 276 men who underwent.t.st.ng at.Calgary Laborat.ry Services （CLS; Calgary, Albert., Canada） bet.een 01 January 2010 and 31 March 2013 were accessed. Linear regression models of mean PSA levels and fast.ng t.mes revealed a st.t.st.cally import.nt.relat.onship at.cert.in fast.ng t.mes. Applying a dynamic mat.emat.cal model t. explore t.e clinical effect.of fast.ng suggest. minimal impact.on serum PSA result.int.rpret.t.on. t.us, pat.ent. can be t.st.d for serum PSA levels regardless of t.eir fast.ng st.t..

关键词： diagnost.c t.st fast.ng prost.t.-specific ant.gen (PSA)

Effect.of t.aining on t.o-way Shape Memory Effect.and It. St.bilit. in a t.-Ni-Hf High t.mperat.re Shape Memory Alloy

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Journal of Mat.rials Science & t.chnology 2003年第6期19卷 590-592页

作者： XianglongMENG WeiCAI K.t.lau L.M.ZHOU LianchengZHAO SchoolofMat.rialsScience&Engineering HarbinInstituteofTechnologyHarbin150001China Depart.ent.fMechanicalEngineering TheHongKongPolytechnicUniversityHungHomKowloonHongKongChina

t.e Effect.of t.e t.ermal cycling t.aining under const.nt.st.ain on t.e t.o-way shape memory effect.(t.SME) in a t.36l\li49Hf15 high t.mperat.re shape memory alloy (SMA) has been invest.gat.d by bending t.st.. t.e result. indicat.d t.at.t.e t.aining procedure is beneficial t. get.t.e bet.er t.SME. t.e t.o-way shape memory st.ain increases wit. increasing t.e t.aining st.ain. And it.decreases wit. increasing t.e t.aining t.mperat.re. t.e t.SME obt.ined in t.e present.alloy shows poorer st.bilit. compared wit. t.at.obt.ined in t.e t.Ni alloys.

关键词： t.NiHf alloy High t.mperat.re shape memory alloy t.o-way shape memory effect t.aining

t.e Pioneering Works of Professor Duzheng YE on At.ospheric Dispersion,t.bet.n Plat.au Met.orology,and Air–Sea Int.ract.on

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Advances in At.ospheric Sciences 2017年第10期34卷 1137-1149页

作者： Ngar-Cheung lau Inst.t.t. of Environment Energy and Sustainabilityand Department of Geography and Resource ManagementThe Chinese University of Hong KongShatinN.T.Hong Kong

t.is paper provides an overview of t.e impact. of t.e original works of Professor Duzheng YE on a select.d set.of observat.onal and model st.dies wit. which t.e present.aut.or has been associat.d over t.e past.several decades. t.e main t.emes of t.ese works include at.ospheric energy dispersion, air–land int.ract.ons over t.e t.bet.n Plat.au, and El Ni n？orelat.d air–sea coupling over East.*** dispersive behavior of observed at.ospheric fluct.at.ons accompanying cold surge event. in East.Asia is demonst.at.d. Cold air out.reaks over Korea and sout.ern China are coincident.wit. t.e successive downst.eam development.of t.oughs and ridges, wit. t.e group velocit. of such wave packet. being not.bly fast.r t.an t.e phase propagat.on speed of individual t.oughs and ridges. In a more general cont.xt. dispersive feat.res are also discernible from lagged t.leconnect.on chart. and cross-spect.a of observed and model-simulat.d geopot.nt.al height.variat.ons on 10–30-day t.me *** t.e out.ut.from a high-resolut.on general circulat.on model, t.e relat.ve cont.ibut.ons of condensat.onal, sensible, and radiat.ve heat.ng t. t.e at.ospheric energy budget.over t.e t.bet.n Plat.au are document.d. t.e rapid changes of t.e upper t.opospheric t.bet.n ant.cyclone and East.Asian mei-yu（＂plum rain＂） precipit.t.on band associat.d wit. t.e development.of t.e Asian monsoon syst.m are *** principal anomalies in sea level pressure, surface wind, precipit.t.on and sea surface t.mperat.re over sout.east.rn China and t.e Philippine Sea region during El Nio event. are present.d. t.e cont.ibut.ons of remot. El Nio-relat.d forcing and local air–sea int.ract.on t. t.e occurrence of t.ese anomalies are assessed.

关键词： at.ospheric dispersion t.bet.n Plat.au met.orology El Nio

Comput.r Assist.d Learning for Improving Cat.le Palpat.on Skills of Vet.rinary St.dent.

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Open Journal of Vet.rinary Medicine 2013年第8期3卷 319-327页

作者： Scot. t. Norman gloria Dall’Alba School of Animal and Vet.rinary Sciences and E.H. Graham Cent.e for Agricult.ral Innovat.on Charles Sturt University Wagga Wagga Australia School of Educat.on The University of Queensland Brisbane Australia

t.is st.dy invest.gat.d t.e effect.of a comput.r assist.d learning (CAL) t.ol on t.e development.of skills in palpat.on of t.e reproduct.ve t.act.of t.e cow per rect.m (rect.l palpat.on) by fourt.-year st.dent. in a Bachelor of Vet.rinary Science (BVSc) degree program. A secondary aim was t. det.rmine if animal welfare could be improved by t.e CAL int.rvent.on. t.e CAL t.ol was developed t. provide: vivid, t.ree-dimensional int.ract.ve graphics of t.e relevant.anat.my and skills;a comprehensive glossary of t.rminology used in associat.on wit. t.e skills;and format.ve assessment.t.sks. Prior t. it. int.oduct.on t. t.e course, indust.y st.keholders assessed t.e CAL t.ol graphics as an accurat. depict.on of t.e procedures. t.o consecut.ve cohort. of st.dent. were surveyed prior t. (n = 91) and aft.r t.e CAL int.rvent.on (n = 111). Responses t. st.dent.surveys suggest.d t.at.post.int.rvent.on skills were learned at.approximat.ly t.e same rat. as pre-int.rvent.on. However, t.t.r surveys indicat.d t.at.st.dent. in t.e pre-int.rvent.on group may have had insufficient.underst.nding for accurat. self-assessment.compared t. post.int.rvent.on st.dent.. According t. t.t.rs, subst.nt.ally more st.dent. in t.e post.int.rvent.on group gained pract.cal skills at.an improved rat. and t. a higher level of compet.ncy. Bot. st.dent.and t.t.r surveys indicat.d t.at.t.ere was a minimal discomfort.t. animals in t.ese pract.cal classes. From an animal welfare point.of-view, it.was concluded t.at.t.e int.rvent.on would not.result.in a reduct.on in t.e number of animals required during pract.cal sessions. However, due t. t.e preparat.on and reinforcement.provided by t.e CAL t.ol, animals were used more efficient.y by st.dent. aft.r t.e int.rvent.on, result.ng in t.e at.ainment.of a higher level of skill. Knowledge gained from t.is st.dy may be relevant.t. ot.er disciplines requiring st.dent. t. develop pract.cal skills associat.d wit. animals or humans.

关键词： Comput.r Assist.d Learning (CAL) Comput.r Simulat.on Vet.rinary Science Educat.on Skill At.ainment Professional Educat.on

Phase t.ansformat.on and t.ermal St.bilit. of Aged t.-Ni-Hf High t.mperat.re Shape Memory Alloys

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Journal of Mat.rials Science & t.chnology 2006年第5期22卷 691-695页

作者： Xianglong MENG Wei CAI K.t.lau L.M.Zhou Liancheng ZHAO School of Mat.rials science ＆ Engineering Harbin Institute of Technology Harbin 150001 China Depart.ent.of Mechanical Engineering The Hong Kong Polytechnic umversity Hung Horn KowloonHong Kong China

t.e use of Ni-rich t.NiHf alloys as high t.mperat.re shape memory alloys （SMAs） t.rough aging has been present.d. For Ni-rich t.80-xNixHf20 alloys, t.eir phase t.ansformat.on t.mperat.res are averagely increased more t.an 100 K by aging at.823 K for 2 h. Especially for t.e alloys wit. Ni-cont.nt.of 50.4 at. pct.and 50.6 at. pct. t.eir mart.nsit.c t.ansformat.on st.rt.t.mperat.res （Ms） are more t.an 473 K aft.r aging. t.M observat.on confirmed t.at.some fine part.cles precipit.t. from t.e mat.ix during aging. t.e aged Ni-rich t.NiHf SMAs show t.e bet.er t.ermal st.bilit. of phase t.ansformat.on t.mperat.res t.an t.e solut.ont.eat.d t.NiHf alloys. t.e fine part.cles precipit.t.d during aging should be responsible for t.e increase of phase t.ansformat.on t.mperat.res and it. high st.bilit..

关键词： t.NiHf alloy High t.mperat.re shape memory alloy Aging Phase t.ansformat.on

Cadmium,chromium,copper,iron,lead,mercury,nickel,and zinc in freshwat.r fish:Assessing t.ophic t.ansfer using st.ble isot.pe rat.os ofδ^(15)N andδ^(13)C

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Journal of Environment.l Sciences 2023年第6期128卷 250-257页

作者： Chest.r lau X.Chris Le Depart.ent.of Chemist.y Faculty of ScienceUniversity of AlbertaAlberta T6G 2G2Canada Division of Analyt.cal and Environment.l t.xicology Department of Laboratory Medicine and PathologyFaculty of Medicine and DentistryUniversity of AlbertaAlberta T6G 2G3Canada

Int.oduct.on t.e healt. benefit. of consuming aquat.c organisms are clear,given t.eir high prot.in count.low sat.rat.d fat.,and low cholest.rol ***,in part.cular,cont.ins valuable nut.ient.(e.g.,omega-3 polyunsat.rat.d fat.),vit.mins,essent.al element.,and is t.erefore considered an import.nt.part.of a balanced human *** is a major seafood producer,account.ng for 58%of global product.on in 2018(Crona et.al.,2020).China is t.e largest.seafood consuming count.y in t.e world,wit. consumpt.on rat.s st.adily *** t.e 1978 Chinese economic reform,t.e amount.of seafood consumed per capit. in China increased from 5 kg per capit. in 1980 t. 41 kg in 2015(Zhang et.al.,2021).By 2030,t.e overall amount.of fish consumpt.on will likely exceed t.e amount.of fish product.on in China.

关键词： Aquat.c environment Bioaccumulat.on Biomagnificat.on Fish consumpt.on Growt. dilut.on effect Met.l cont.minat.on St.ble isot.pe rat.o t.ace element. t.ophic levels

Assessment.of Deformat.on of Shear Localized Chip in High Speed Machining

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厦门大学学报（自然科学版） 2002年第S1期41卷 11-12页

作者： t.C LEE W S lau S K CHAN Indust.ial Syst.m Engineering Depart.ent Hong Kong Polytechnic UniversityHong Kong Institute of Vocational EducationGolden Tech Machinery Ltd. Hong Kong China Hong Kong China Hong Kong China

As t.e cut.ing speed goes higher, t.e mechanism of chip deformat.on will be changed significant.y, i.e., cont.nuous chip in low cut.ing speed will shift.t. serrat.d chip wit. shear localizat.on. For t.e shear localized chip, t.e paramet.rs used t. assess t.e chip deformat.on for cont.nuous chip, such as short.n coefficient.ξ, shear angle φ and shear st.ain ε, can not.describe t.e chip deformat.on correct.y or comprehensively. t.is paper deals wit. t.e assessment.of chip deformat.on of shear localizat.on. t.ere are t.o deformat.on regions in shear localized chip, one is t.e chip segment.body wit. relat.ve smaller plast.c deformat.on, anot.er one is t.e boundary bet.een segment. wit. shear localizat.on, so called shear band. Considering t.e t.o dist.nct.deformat.on regions, t.o paramet.rs are used t. define t.eir deformat.on respect.vely. According t. t.e analysis of chip format.on process, t.e equat.ons have been deduced t. calculat. t.e shear st.ains of shear band ε, shear st.ain of chip segment.ε 1 and shear rat. so t.at.t.e shear localized chip deformat.on can be assessed correct.y and comprehensively. By use of t.is assessment. t.e chip deformat.on in machining selenium t.eat.d st.inless st.el (St.S) and common st.inless st.el at.various cut.ing condit.ons is invest.gat.d. t.e experiment.result. obt.ined by t.e machining of st.inless st.el prove t.at. (1) t.e shear st.ain and st.ain rat. increase wit. t.e increasing of cut.ing speed; (2) t.e shear st.ain in shear band can be over 10 when cut.ing speed exceeding 200 m/min for bot. t.pes of st.inless st.el, and it.is much higher t.an t.e st.ain of chip segment. t.e difference will be enlarged as t.e cut.ing speed increasing; (3) As t.e comparison, t.e shear st.ain for t.e St.S is a lit.le lower t.an t.at.for JIS304; (4) t.e st.in rat. is ext.emely high (= 2.5×10 5 1/s ). In range of cut.ing speed less t.an 180 m/min, t.e st.ain rat. for St.S is lower t.an t.at.for JIS304. However, when t.e cut.ing speed is higher t

关键词： chip deformat.on shear localizat.on high speed machining

Modified convent.onal clamp-crushing t.chnique in liver parenchymal t.ansect.on

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Hepat.biliary & Pancreat.c Diseases Int.rnat.onal 2012年第4期11卷 442-445页

作者： Wan-Yee lau Facult. of Medicine The Chinese University of Hong KongShatinHong Kong SARChina

Significant.int.aoperat.ve bleeding and injuries t. vit.l st.uct.res in t.e liver remnant.can occur during liver parenchymal t.ansect.on using t.e convent.onal clampcrushing *** performed liver resect.on on 242 pat.ent. using a mosquit. clamp-crushing t.chnique combined wit. a self-assembled saline-linked diat.ermy for liver parenchymal *** mean blood loss was 215 mL(range 20-1100).t.ere was no damage t. t.e vit.l st.uct.res in t.e liver *** mean liver t.ansect.on t.me was 53 minut.s(range 15-125).Our t.chnique has t.e advant.ges of reducing blood loss,exposing vessles clearly and being simple,cheap and efficacious.

关键词： hepat.ct.my hepat.cellular carcinoma liver neoplasm