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Engineering behaviour of in sit. cored deep cement.mixed marine deposit. subject.d t. undrained and drained shearing

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Journal of Rock Mechanics and Geot.chnical Engineering 2024年第5期16卷 1749-1760页

作者： Wei Li chung Yee Kwok Facult. of Engineering China University of GeosciencesWuhan430074China Depart.ent.of Civil Engineering The University of Hong Kong999000Hong Kong SARChina

t.e deep cement.mixing(DCM)is used t. improve t.e capacit. and reduce t.e set.lement.of t.e soft.ground by forming cement.d clay *** invest.gat.on on t.e mechanical behaviour of t.e DCM samples is limit.d t. eit.er laborat.ry-prepared samples or in-sit. samples under unconfined *** t.is st.dy,a series of drained and undrained t.iaxial shearing t.st. was performed on t.e in-sit. cored DCM samples wit. high cement.cont.nt.t. assess t.eir mechanical *** is found t.at.t.e drainage condit.on affect. significant.y t.e st.ffness,peak and residual st.engt.s of t.e DCM samples,which is mainly due t. t.e st.t. of excess pore wat.r pressure at.different.st.ain levels,*** posit.ve before t.e peak deviat.ric st.ess and negat.ve aft.r t.e peak deviat.ric st.ess,in t.e undrained *** slope of t.e failure envelope changes obviously wit. t.e confining pressures,being st.eper at.lower st.ess levels and flat.er at.higher st.ess *** st.engt. paramet.rs,effect.ve cohesion and frict.on angle obt.ined from lower st.ess levels(c′0 andφ′0)are 400 kPa and 58°,respect.vely,which are deemed t. be t.ue for design in most.DCM applicat.ons where t.e in-sit. st.ess levels are normally at.lower values of 50-200 ***,t.e comput.d t.mography(Ct.scanning syst.m was adopt.d t. visualize t.e int.rnal st.uct.res of DCM *** is found t.at.t.e clay pocket. exist.ng inside t.e DCM samples due t. uneven mixing affect.markedly t.eir st.ess-st.ain behaviour,which is one of t.e main reasons for t.e high variabilit. of t.e DCM samples.

关键词： Deep cement.mixing(DCM) In-sit. cored sample t.iaxial shearing Drainage condit.on Confining pressure Comput.d t.mography(Ct.

Ensemble Wind Power Predict.on Int.rval wit. Opt.mal Reserve Requirement

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Journal of Modern Power Syst.ms and Clean Energy 2024年第1期12卷 65-76页

作者： Hamid Rezaie Cheuk Hei chung Nima Safari t.e Saskat.hewan Power Corporat.on(SaskPower) ReginaSaskatchewanCanada t.e Depart.ent.of Elect.ical and Comput.r Engineering and Depart.ent.of Human Biology University of TorontoTorontoON M5S 3G4Canada t.e Albert. Elect.ic Syst.m Operat.r(AESO) CalgaryAlbertaCanada

Wind power predict.on int.rval(WPPI)models in t.e lit.rat.re have predominant.y been developed for and t.st.d on specific case ***,wind behavior and charact.rist.cs can vary significant.y across ***,a predict.on model t.at.performs well in one case might.underperform in *** address t.is short.oming,t.is paper proposes an ensemble WPPI framework t.at.int.grat.s mult.ple WPPI models wit. dist.nct.charact.rist.cs t. improve *** import.nt.and oft.n overlooked fact.r is t.e role of probabilist.c wind power predict.on(WPP)in quant.fying wind power uncert.int.,which should be handled by operat.ng *** reserve in WPPI frameworks enhances t.e efficacy of *** t.is regard,t.e proposed framework employs a novel bi-layer opt.mizat.on approach t.at.t.kes bot. WPPI qualit. and reserve requirement. int. *** analysis wit. different.real-world dat.set. and various benchmark models validat.s t.e qualit. of t.e obt.ined WPPIs while result.ng in more opt.mal reserve requirement..

关键词： Ensemble model linear programming operat.ng reserve opt.mal reserve requirement predict.on int.rval probabilist.c predict.on renewable int.grat.on uncert.int. represent.t.on wind power predict.on(WPP)

Small-signal St.bilit. Crit.ria in Power Elect.onics-dominat.d Power Syst.ms:A Comparat.ve Review

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Journal of Modern Power Syst.ms and Clean Energy 2024年第4期12卷 1003-1018页

作者： Qifan Chen Siqi Bu Chi Yung chung Depart.ent.of Elect.ical and Elect.onic Engineer The Hong Kong Polytechnic UniversityHong KongChina Depart.ent.of Elect.ical and Elect.onic Engineering Shenzhen Research InstituteCentre for Grid ModernisationInternational Centre of Urban Energy NexusCentre for Advances in Reliability and SafetyResearch Institute for Smart Energyand Policy Research Centre for Innovation and TechnologyThe Hong Kong Polytechnic UniversityHong KongChina

t. t.ckle emerging power syst.m small-signal st.bilit. problems such as wideband oscillat.ons induced by t.e large-scale int.grat.on of renewable energy and power elect.onics,it.is crucial t. review and compare exist.ng small-signal st.bilit. analysis *** t.is basis,guidance can be provided on det.rmining suit.ble analysis met.ods t. solve relevant.small-signal st.bilit. problems in power elect.onics-dominat.d power syst.ms(PEDPSs).Various mat.re met.ods have been developed t. analyze t.e small-signal st.bilit. of PEDPSs,including eigenvalue-based met.ods,Rout. st.bilit. crit.rion,Nyquist.Bode plot.based met.ods,passivit.-based met.ods,posit.ve-net.damping met.od,lumped impedance-based met.ods,bifurcat.on-based met.ods,*** t.is paper,t.e applicat.on condit.ons,advant.ges,and limit.t.ons of t.ese crit.ria in ident.fying oscillat.on frequencies and st.bilit. margins are reviewed and compared t. reveal and explain connect.ons and discrepancies among ***,effort. are devot.d t. mat.emat.cally proving t.e equivalence bet.een t.ese small-signal st.bilit. ***,t.e performance of t.ese crit.ria is demonst.at.d and compared in a 4-machine 2-area power syst.m wit. a wind farm and an IEEE 39-bus power syst.m wit. 3 wind farms.

关键词： Impedance-based met.od oscillat.on analysis power elect.onic convert.r power elect.onics-dominat.d power syst.m renewable power generat.on small-signal st.bilit.

Int.rplay of laser power and pore charact.rist.cs in select.ve laser melt.ng of ZK60 magnesium alloys:A st.dy based on in-sit. monit.ring and image analysis

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Journal of Magnesium and Alloys 2024年第4期12卷 1346-1366页

作者： Weijie Xie Hau-chung Man Chi-Wai Chan Depart.ent.of Indust.ial and Syst.ms Engineering The Hong Kong Polytechnic UniversityHong KongChina School of Mechanical and Aerospace Engineering Queen’s UniversityBelfast BT95AHUK Research Inst.t.t. for Advanced Manufact.ring The Hong Kong Polytechnic UniversityHong KongChina

t.is st.dy offers significant.insight. int. t.e mult.-physics phenomena of t.e SLM process and t.e subsequent.porosit. charact.rist.cs of ZK60 Magnesium(Mg)***-speed in-sit. monit.ring was employed t. visualise process signals in real-t.me,elucidat.ng t.e dynamics of melt.pools and vapour plumes under varying laser power condit.ons specifically bet.een 40 W and 60 *** morphological analysis was performed using Scanning-Elect.on Microscopy(SEM),demonst.at.ng a crit.cal correlat.on bet.een laser power and pore *** laser power led t. increased pore coverage,whereas a denser st.uct.re was observed at.higher laser *** laser power influence on porosit. was furt.er confirmed via Opt.cal Microscopy(OM)conduct.d on bot. t.p and cross-sect.onal surfaces of t.e *** increase in laser power result.d in a decrease in pore coverage and pore size,pot.nt.ally leading t. a denser print.d part.of Mg alloy.X-ray Comput.d t.mography(XCt.augment.d t.ese findings by providing a 3D volumet.ic represent.t.on of t.e sample int.rnal st.uct.re,revealing an inverse relat.onship bet.een laser power and overall pore *** laser power appeared t. favour t.e format.on of int.rconnect.d pores,while a reduct.on in int.rconnect.d pores and an increase in isolat.d pores were observed at.higher *** int.rplay bet.een melt.pool size,vapour plume effect.,and laser power was found t. significant.y influence t.e result.ng porosit.,indicat.ng a need for effect.ve management.of t.ese fact.rs t. opt.mise t.e SLM process of Mg alloys.

关键词： Select.ve laser melt.ng(SLM) Magnesium(Mg)alloys Biodegradable implant. Porosit. In-sit. monit.ring

100 W-class green hydrogen product.on from ammonia at.a dual-layer elect.ode cont.ining a Pt.Ir cat.lyst.for an alkaline elect.olyt.c process

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Journal of Energy Chemist.y 2024年第6期93卷 352-360,I0009页

作者： Donghyun Yoon Sunki chung Minjun Choi Eunhyeok Yang Jaeyoung Lee School of Eart. Sciences and Environment.l Engineering Gwangju Institute of Science and Technology(GIST)Gwangju 61005Republic of Korea Int.rnat.onal Fut.re Research Cent.r of Chemical Energy St.rage and Conversion Processes GISTGwangju 61005Republic of Korea Ert. Cent.r for Elect.ochemist.y and Cat.lysis GISTGwangju 61005Republic of Korea t.G Huchems Co.Lt. 963Sangam-roYeosu-siJeollanam-do 59614Republic of Korea

Ammonia allows st.rage and t.ansport.of hydrogen over long dist.nces and is an at.ract.ve pot.nt.al hydrogen *** decomposit.on has recent.y been used for t.e conversion of ammonia t. hydrogen and is regarded as a fut.re t.chnology for product.on of CO_(2)-free pure ***,a het.rost.uct.ral Pt.Ir dual-layer elect.ode is developed and shown t. achieve successful long-t.rm operat.on in an ammonia elect.olyzer wit. an anion exchange membrane(AEM).t.is elect.olyzer consist.d of eight.membra ne elect.ode assemblies(MEAs)wit. a t.t.l geomet.ic area of 200 cm~2 on t.e anode side,which result.d in a hydrogen product.on rat. of 25 L h~(-1).We observed t.e degradat.on in MEA performance at.ribut.d t. changes in t.e anode cat.lyst.layer during hydrogen product.on via ammonia ***,we demonst.at.d t.e relat.onship bet.een t.e ammonia oxidat.on react.on(AOR)and t.e oxygen evolut.on react.on(OER).

关键词： Ammonia oxidat.on Dual-layer cat.lyst Green hydrogen Elect.olyt.c process Oxygen evolut.on react.on

Supergravit. effect. on flame propagat.on and st.uct.re in hydrogen/air mixt.res

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Act. Mechanica Sinica 2024年第6期40卷 31-38页

作者： Wenkai Liang chung K.Law Cent.r for Combust.on Energy Department of Energy and Power EngineeringTsinghua UniversityBeijing100080China Depart.ent.of Mechanical and Aerospace Engineering Princeton UniversityPrinceton08544USA

In t.e current.work,we invest.gat.d hydrogen/air flame propagat.on under supergravit. *** show t.at.when gravit. is in t.e same/opposit. direct.on as flame propagat.on,it.leads t. accelerat.on/decelerat.on of t.e flame,and t.at.such an effect.could subst.nt.ally modify t.e flame propagat.on and st.uct.re at.high gravit. ***,for t.e absolut. and relat.ve flame propagat.on speeds,t.e gravit.-affect.d flame speed shows opposit. t.ends as t.e absolut. flame speed is more affect.d by t.e local induced flow field,while t.e relat.ve flame speeds are cont.olled by t.e super-adiabat.c or sub-adiabat.c flame *** gravit.-affect.d t.ermal and chemical flame st.uct.res are also examined t.rough t.e influence of t.e mixt.re equivalence rat.o,pressure,and flame st.et.h.

关键词： Supergravit. Flame accelerat.on Laminar flame speed Flame st.et.h Hydrogen

Dat.-driven St.t.c Equivalence wit. Physics-informed Koopman Operat.rs

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CSEE Journal of Power and Energy Syst.ms 2024年第1期10卷 432-438页

作者： Wei Lin Changhong Zhao Maosheng Gao C.Y.chung Depart.ent.of Elect.ical Engineering The Hong Kong Polytechnic UniversityHong Kong SARChina Depart.ent.of Informat.on Engineering The Chinese University of Hong KongHong Kong SARChina School of Elect.ical Engineering Chongqing UniversityChongqing 400044China

Wit. deployment.of measurement.unit.,fit.ing st.t.c equivalent.models of dist.ibut.on net.orks(DNs)by linear regression has been recognized as an effect.ve met.od in power flow analysis of a t.ansmission *** volat.lit. of measurement. caused by variable dist.ibut.d renewable energy sources makes it.more difficult.t. accurat.ly fit.such equivalent.*** t.ckle t.is challenge,t.is let.er proposes a novel dat.-driven met.od t. improve equivalency accuracy of DNs wit. dist.ibut.d energy *** let.er provides a new perspect.ve t.at.an equivalent.model can be regarded as a mapping from int.rnal condit.ons and border volt.ges t. border power *** mapping can be est.blished t.rough 1)Koopman operat.r t.eory,and 2)physical feat.res of power flow equat.ons at.t.e root.node of a *** of t.e proposed met.od is demonst.at.d on t.e IEEE 33-bus and IEEE 136-bus t.st.syst.ms connect.d t. a 661-bus ut.lit. syst.m.

关键词： Dat.-driven dist.ibut.on net.ork Koopman operat.r t.eory st.t.c equivalent.model

Hierarchical Cont.ol St.at.gy for Load Regulat.on Based on St.ckelberg Game t.eory Considering Randomness

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CSEE Journal of Power and Energy Syst.ms 2024年第3期10卷 929-941页

作者： t.ngyu Jiang Ping Ju C.Y.chung Yuzhong Gong College of Energy and Elect.ical Engineering Hohai UniversityNanjing 211100China Depart.ent.of Elect.ical Engineering City University of Hong KongHong Kong CF624China Depart.ent.of Elect.ical and Comput.r Engineering University of SaskatchewanSaskatoonSK S7N 5A9Canada CSEE IEEE

Demand response has been recognized as a valuable funct.onalit. of power syst.ms for mit.gat.ng power *** paper proposes a hierarchical cont.ol st.at.gy among t.e dist.ibut.on syst.m operat.r(DSO),load aggregat.rs(LAs),and t.ermost.t.cally cont.olled loads(t.Ls);t.e st.at.gy includes a scheduling layer and an execut.ve layer t. provide load *** t.e scheduling layer,t.e DSO(leader)offers compensat.on price(CP)st.at.gies,and t.e LAs(followers)respond t. CP st.at.gies wit. available regulat.on power(ARP)*** of t.e DSO and LAs are modeled according t. t.eir behaviors during t.e load regulat.on *** game is adopt.d t. capt.re int.ract.ons among t.e players and leader and t. obt.in t.e opt.mal st.at.gy for each part.cipant.t. achieve ***,considering inevit.ble random fact.rs in pract.ce,e.g.,renewable generat.on and behavior of users,t.o different.st.chast.c models based on sample average approximat.on(SAA)and paramet.r modificat.on are formulat.d wit. improved scheduling *** t.e execut.ve layer,dist.ibut.d t.Ls are t.iggered based on st.at.gies det.rmined in t.e scheduling layer.A self-t.iggering met.od t.at.does not.violat. user privacy is present.d,where t.Ls receive ext.rnal signals from t.e LA and independent.y det.rmine whet.er t. alt.r t.eir operat.on *** simulat.ons are performed on t.e modified IEEE-24 bus syst.m t. verify effect.veness of t.e proposed st.at.gy.

关键词： Demand response hierarchical cont.ol load regulat.on self-t.iggering met.od St.ckelberg game

Cret.ceous crown male ant.reveals t.e rise of modern lineages

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Zoological Research 2024年第5期45卷 983-989页

作者： Qiong Wu Alexander G.Radchenko michael S.Engel Xiao-Qin Li Hong-Ru Yang Xing-Ru Li chung-Kun Shih Dong Ren t.i-Ping Gao College of Life Sciences Capital Normal UniversityBeijing 100048China I.I.Schmalhausen Inst.t.t. of Zoology NAS of UkraineKiev 01054Ukraine Division of Invert.brat. Zoology American Museum of Natural HistoryNew York 10024-5192USA Facult.d de Ciencias Biológicas Universidad Nacional Mayor de San MarcosLima 11-0058Perú Depart.ment. de Ent.mología Museo de Historia NaturalUniversidad Nacional Mayor de San MarcosLima 15072Perú Depart.ent.of Chemist.y Analytical and Testing CenterCapital Normal UniversityBeijing 100048China Depart.ent.of Paleobiology National Museum of Natural HistorySmithsonian InstitutionWashington DC 20013-7012USA

Most.described Mesozoic ant. belong t. st.m groups t.at.exist.d only during t.e Cret.ceous ***,t.e earliest.known crown ant. were dat.d t. t.e t.ronian(Lat. Cret.ceous,ca.94-90 million years ago(Ma))deposit. found in t.e USA,Kazakhst.n,and ***,t.e recent.discovery of an alat. male ant.in Kachin amber from t.e earliest.Cenomanian(ca.99 Ma),represent.ng a new genus and species,Ant.quiformica alat.,revises t.e narrat.ve on ant.*** can be dist.nct.y different.at.d from all known male st.m ant. by it. geniculat. ant.nnae wit. elongat.d scape,ext.nding far beyond t.e occipit.l margin of t.e head and half t.e lengt. of t.e funiculus,as well as it. part.y reduced forewing ***,t.e combinat.on of a one-segment.d waist.wit. a well-developed node,elongat.d scape ext.nding beyond t.e occipit.l margin,and reduced forewing venat.on,part.cularly t.e complet.ly reduced m-cu and rs-m crossveins and absence of rm and mcu closed cells,firmly places t.e fossil wit.in t.e ext.nt.subfamily *** t.ansform infrared spect.oscopy(Ft.R)confirmed t.at.t.e amber cont.ining Ant.quiformica alat. originat.d from t.e Kachin mines in *** discovery significant.y revises our underst.nding of t.e early evolut.on of *** presence of Ant.quiformica in Cenomanian amber indicat.s t.at.t.e subfamily Formicinae emerged at.least.by t.e st.rt.of t.e Lat. Cret.ceous,wit. crown ant. likely originat.ng earlier during t.e earliest.Cret.ceous or possibly t.e Lat. Jurassic,alt.ough paleont.logical evidence is lacking t. support.t.e lat.er hypot.esis.

关键词： Formicidae Formicinae Morphology t.xonomy Ant.quiformica alat. Paleont.logy Kachin amber