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A novel cascaded H-bridg. phot.volt.ic invert.r wit. flexible arc suppression funct.on

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g.obal Energ. Int.rconnect.on 2024年第4期7卷 513-527页

作者： Junyi t.ng.wei g.o Colleg. of Elect.ical Eng.neering.and Aut.mat.on Fuzhou UniversityFuzhou 350108P.R.China

t.is paper present. a novel approach t.at.simult.neously enables phot.volt.ic(PV)inversion and flexible arc suppression during.sing.e-phase g.ounding.*** compensat. for g.ound current. t.roug. an arc-eliminat.on funct.on,while out.ut.ing.a PV direct.current.DC)power *** met.od effect.vely reduces t.e residual g.ounding.*** reduce t.e dependence of t.e arc-suppression performance on accurat. compensat.on current.inject.on models,an adapt.ve fuzzy neural net.ork imit.t.ng.a sliding.mode cont.oller was *** online adapt.ve adjust.ent.law for net.ork paramet.rs was developed,based on t.e Lyapunov st.bilit. t.eorem,t. improve t.e robust.ess of t.e invert.r t. fault.and connect.on ***,a new arc-suppression cont.ol exit.st.at.g. is proposed t. allow a zerosequence volt.g. amplit.de t. quickly and smoot.ly t.ack a t.rg.t.value by cont.olling.t.e nonlinear decrease in current.and reducing.t.e reg.lat.on *** result. showed t.at.t.e proposed met.od can effect.vely achieve fast.arc suppression and reduce t.e fault.impact.current.in sing.e-phase g.ounding.*** t. ot.er met.ods,t.e proposed met.od can g.nerat. a lower residual g.ounding.current.and maint.in g.od arc-suppression performance under different.t.ansit.on resist.nces and fault.locat.ons.

关键词： Phot.volt.ic invert.r Flexible arc suppression Adapt.ve cont.ol Fuzzy neural net.ork Sliding.mode cont.ol Exit.st.at.g.

SOLVINg.SYSt.MS OF PHASELESS EQUAt.ONS VIA RIEMANNIAN OPt.MIZAt.ON WIt. OPt.MAL SAMPLINg.COMPLEXIt.

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Journal of Comput.t.onal Mat.emat.cs 2024年第3期42卷 755-783页

作者： Jianfeng.Cai Ke wei Depart.ent.of Mat.emat.cs Hong Kong University of Science and TechnologyClear Water BayKowloonHong Kong SARChina School of Dat. Science Fudan UniversityShanghaiChina

A Riemannian g.adient.descent.alg.rit.m and a t.uncat.d variant.are present.d t. solve syst.ms of phaseless equat.ons|Ax|^(2)=*** alg.rit.ms are developed by exploit.ng.t.e inherent.low rank st.uct.re of t.e problem based on t.e embedded manifold of rank-1 posit.ve semidefinit. *** recovery g.arant.e has been est.blished for t.e t.uncat.d variant.showing.t.at.t.e alg.rit.m is able t. achieve successful recovery when t.e number of equat.ons is proport.onal t. t.e number of *** key ing.edient. in t.e analysis are t.e rest.ict.d well condit.oned propert. and t.e rest.ict.d weak correlat.on propert. of t.e associat.d t.uncat.d linear *** evaluat.ons show t.at.our alg.rit.ms are compet.t.ve wit. ot.er st.t.-of-t.e-art.first.order nonconvex approaches wit. provable g.arant.es.

关键词： Phaseless equat.ons Riemannian g.adient.descent Manifold of rank-1 and posit.ve semidefinit. mat.ices Opt.mal sampling.complexit.

2D all-org.nic perovskit.s refine flexible elect.onics

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Science China Mat.rials 2024年第7期67卷 2365-2366页

作者： wei Zhou Bing.Chen Colleg. of Elect.onic and Opt.cal Eng.neering.and Colleg. of Flexible Elect.onics(Fut.re t.chnolog.) Nanjing University of Posts and TelecommunicationsNanjing 210023China

Recent.years have wit.essed a paradig. shift.wit. t.e advent.of perovskit.s,a class of mat.rials wit. a dist.nct.Cat.O_(3)-t.pe cryst.lline st.uct.re t.at.show remarkable promise across a wide array of applicat.ons,including.phot.volt.ics,phot.det.ct.rs,lig.t.ng.lasers,and so *** t.em,t.e development.of t.o-dimensional(2D)perovskit.s has g.rnered sig.ificant.at.ent.on due t. t.eir t.nable st.uct.res(mainly Dion-Jacobson and Ruddlesden-Popper st.uct.res)and enhanced st.bilit. in comparison wit. t.eir 3D count.rpart.[1].Amidst.t.e burg.oning.research on perovskit.s,on t.e ot.er side,all-org.nic perovskit.s st.nd out.as a part.cularly int.ig.ing.subset.2].Unlike t.adit.onal perovskit.s t.at.t.pically comprise all-inorg.nic(e.g.,CsPbBr_(3))or org.nic-inorg.nic hybrid component.(e.g.,(PEA)_(2)PbI_(4)),all-org.nic perovskit.s are composed ent.rely of carbon-or nit.og.n-based molecules.

关键词： perovskit. inorg.nic ent.rely

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Is t.e Cape St.ne Forest.in Shant.u Cit. formed by wave erosion? A comparison of t.e pedest.l rocks on t.e coast. and t.e mount.ins of Queshi in east.rn g.ang.ong. China

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Journal of Mount.in Science 2024年第5期21卷 1447-1463页

作者： CHEN Min WANg.wei School of g.og.aphy South China Normal UniversityGuangzhou 510631China

Cape St.ne Forest.is a g.oup of g.anit. rock pillars(pedest.l rocks) t.wering.over Shilin Lake, on t.e sout.ern shore of Shant.u Bay in east.rn g.ang.ong. China. t.e rock pillars were previously ident.fied as sea st.cks because t.ey have marine not.h-like concave sidewalls at.t.eir base, and more import.nt.y, t.e lake is immediat.ly adjacent.t. t.e bay, which is exposed t. t.e open sea. However, rock pillars similar in shape and size can also be found at.t.e t.p of Queshi Mount.in, which is only about.300 met.rs nort.west.of t.e lake and about.85 met.rs above sea level. t.erefore, t.e marine orig.n of Cape St.ne Forest.is seriously quest.oned. In t.is st.dy, 3D imag.ry and drone t.chnolog. were used t. collect.dat. in t.e invest.g.t.ons wit.out.direct.manual measurement. in t.e wat.r or on t.e mount.in. It.shows t.at.t.e concave sidewalls of t.e rock pillars in t.e lake and on t.e mount.ins occur at.different.heig.t. and are exposed t. different.direct.ons, while a nat.ral sea st.ck on Mayu Island at.t.e mout. of Shant.u Bay has a horizont.l not.h parallel t. t.e sea level, alt.oug. t.e g.anit. rock of t.e sea st.ck is t.e same as t.at.of t.e lake and t.e mount.ins. t.e east.rn side of t.e island, where t.e sea st.ck is locat.d, is exposed t. t.e open sea but.blocks larg. waves for t.e rock pillars in t.e lake. t.erefore, t.e orig.n of Cape St.ne Forest.cannot.be explained by wave-based mechanisms. t.e only sat.sfact.ry explanat.on t.at.t.kes int. account.all t.e field evidence is t.at.t.e narrow rock pillars of t.e lake and mount.in were formed by chemical weat.ering.t.at.penet.at.d closely t.e spaced joint. of t.e g.anit. rock, and t.e not.h-like concave sidewalls were formed by more effect.ve chemical weat.ering.at.t.e base of t.e pillars.

关键词： Pedest.l rock g.anit. Closely spaced joint. Wave erosion Chemical weat.ering

g.obal St.bilit. t. St.ady Supersonic Rayleig. Flows in One-Dimensional Duct

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Chinese Annals of Mat.emat.cs,Series B 2024年第2期45卷 279-296页

作者： Feng.un wei Jianli LIU Depart.ent.of Mat.emat.cs Shanghai University Newt.uch Cent.r for Mat.emat.cs of Shang.ai Universit.

Heat.exchang. plays an import.nt.role in hydrodynamical syst.ms,which is an int.rest.ng.t.pic in t.eory and *** t.is paper,t.e aut.ors consider t.e g.obal st.bilit. of st.ady supersonic Rayleig. flows for t.e one-dimensional compressible Euler equat.ons wit. heat.exchang.,under t.e small pert.rbat.ons of init.al and boundary condit.ons in a finit. rect.linear duct.

关键词： Compressible Euler equat.ons Heat.exchang. Supersonic Rayleig. fow St.ady solut.on Classical solut.on

t.o Applicat.ons of t.e ■■-Hodg. t.eory

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Chinese Annals of Mat.emat.cs,Series B 2024年第1期45卷 137-150页

作者： Ding.hang.wei Sheng.ao ZHU Cent.r of Mat.emat.cal Sciences Zhejiang UniversityHangzhou 310027China Depart.ent.of Mat.emat.cs Zhejiang Normal UniversityJinhua 321004ZhejiangChina

Using.Hodg. t.eory and Banach fixed point.t.eorem,Liu and Zhu developed a g.obal met.od t. deal wit. various problems in deformat.on *** t.is not.,t.e aut.ors g.neralize Liu-Zhu's met.od t. t.eat.t.o deformat.on problems for non-Kahler *** apply t.e ■■-Hodg. t.eory t. const.uct.a deformat.on formula for(p,q)-forms of compact.complex manifold under deformat.ons,which can be used t. st.dy t.e Hodg. number of complex manifold under *** t.e second part.of t.is not.,by using.t.e ■■-Hodg. t.eory,t.ey provide a simple proof of t.e unobst.uct.d deformat.on t.eorem for t.e non-Kahler Calabi-Yau ■■-manifolds.

关键词： Complex st.uct.res Deformat.ons (p,q)-Forms Non-Kahler Calabi-Yaumanifolds

Nest.decorat.on:Black feat.ers prevent.Crest.d Mynas from nest.usurpat.on

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Avian Research 2024年第2期15卷 292-297页

作者： Jinmei Liu wei Liang Minist.y of Educat.on Key Laborat.ry for Ecolog. of t.opical Islands Key Laboratory of Tropical Animal and Plant Ecology of Hainan ProvinceCollege of Life SciencesHainan Normal UniversityHaikou571158China

Nest. are import.nt.st.uct.res for birds t. raise t.eir offspring.and for *** birds incorporat. feat.ers int. t.e nest.since feat.ers were t.adit.onally t.oug.t.t. serve t.e funct.on of *** in recent.years have considered t.at.some birds place feat.ers in conspicuous locat.ons in t.e nest.for decorat.on t. t.ig.er a fear response in t.e *** t.is st.dy,we invest.g.t.d whet.er decorat.ve feat.ers could det.r nest.usurpat.on by Crest.d Mynas(Acridot.eres crist.t.llus)by manipulat.ng.nest.box *** result. revealed t.at.Crest.d Mynas preferred black feat.ers t. whit. feat.ers as decorat.ons and occupied nest.boxes decorat.d wit. black feat.ers sig.ificant.y less t.an t.ose decorat.d wit. whit. feat.ers,sug.est.ng.t.at.black decorat.ve feat.ers in t.e nest.could be more effect.ve in prevent.ng.nest.usurpat.on by Crest.d Mynas and t.at.whit. decorat.ve feat.ers may have ot.er *** black feat.ers in t.e nest.are prominent.y placed at.t.e edg. of t.e nest.t. convey t.e messag. t.at.t.is nest.is occupied”or“t.e owner of t.is nest.has been preyed upon”t. visit.r Crest.d Mynas,t.us effect.vely prevent.ng.t.em from usurping.t.e nest.at.a lat.r st.g..

关键词： Ext.nded phenot.pe Feat.ers Nest.decorat.on Nest.usurpat.on

St.ady-st.t. Volt.g. Securit.-const.ained Opt.mal Frequency Cont.ol for Weak HVDC Sending.end AC Power Syst.ms

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Journal of Modern Power Syst.ms and Clean Energ. 2024年第2期12卷 658-669页

作者： Qiang.iang.Wang.Liang.hong.Yao Jian Xu Yuping.Zheng.wei Li wei Wang School of Elect.ical Eng.neering.and Aut.mat.on Wuhan UniversityWuhan 430072China Hubei Eng.neering.and t.chnolog. Research Cent.r for AC/DC Int.llig.nt.Dist.ibut.on Net.ork(Wuhan Universit.) Wuhan 430072China St.t. Key Laborat.ry of Smart.g.id Prot.ct.on and Cont.ol NARI Group Corporation(State Grid Electric Power Research Institute)Nanjing 211106China

Due t. t.e fact.t.at.a hig. share of renewable energ. sources(RESs)are connect.d t. hig.-volt.g. direct.current.HVDC)sending.end AC power syst.ms,t.e volt.g. and frequency reg.lat.on capabilit.es of HVDC sending.end AC power syst.ms have *** has result.d in pot.nt.al syst.m operat.ng.problems such as overvolt.g. and overfrequency,which occur simult.neously when block fault. exist.in t.e HVDC *** t.is st.dy,a st.ady-st.t. volt.g. securit.-const.ained opt.mal frequency cont.ol met.od for weak HVDC sending.end AC power syst.ms is *** int.g.at.d virt.al inert.a cont.ol of RESs is employed for syst.m frequency *** dynamic react.ve power compensat.on devices are ut.lized t. cont.ol t.e volt.g. of all nodes meet.volt.g. securit. ***,an opt.mizat.on model t.at.simult.neously considers t.e frequency and st.ady-st.t. volt.g. securit. const.aint. for weak HVDC sending.end AC power syst.ms is *** opt.mal cont.ol scheme wit. t.e minimum t.t.l cost.of g.nerat.on t.ipping.and addit.onal dynamic react.ve power compensat.on required is obt.ined t.roug. t.e opt.mizat.on *** are conduct.d on a modified IEEE 9-bus t.st.syst.m and pract.cal Qing.Yu line commut.t.d convert.r based HVDC(LCC-HVDC)sending.end AC power syst.m t. verify t.e effect.veness of t.e proposed met.od.

关键词： Renewable energ. source(RES) hig.-volt.g. direct.current.HVDC) AC power syst.m opt.mal frequency cont.ol st.ady-st.t. volt.g. securit. dynamic react.ve power compensat.on

On t.e Specificit. of Nanozymes: A Perspect.ve

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Chinese Journal of Chemist.y 2024年第13期42卷 1515-1522页

作者： g.n wei Shuje Liu Yung.Kang.Peng.Hui wei Depart.ent.of Biomedical Eng.neering College of Engineering and Applied SciencesNanjing National Laboratory of MicrostructuresJiangsu Key Laboratory of Artificial Functional MaterialsNanjing UniversityNanjingJiangsu 21023China Depart.ent.of Chemist.y.Cit. Universit. of Hong.Kong Hong Kong 999077Hong Kong SARChina St.t. Key Laborat.ry of Analyt.cal Chemist.y for Life Science School of Chemistry and Chemical EngineeringChemistry and Biomedicine Innovation Center(ChemBIC)Nanjing UniversityNanjingJiangsu 210023China NMPA Key Laborat.ry for Biomedical Opt.cs HangzhouZhejiang 310018China

We have compiled eig.t.promising.st.at.g.es for enhancing.t.e specificit. and select.vit. of nanozymes,as depict.d in t.e comprehensive summary *** exhibit.int.icat. and sophist.cat.d st.uct.res,including.subst.at. channels and act.ve sit.s,which can inform t.e desig. of *** of t.ese st.uct.ral feat.res and t.e applicat.on of facet.eng.neering.doping.t.chniques can sig.ificant.y enhance t.e cat.lyt.c specificit. of ***,t.e use of Molecularly Imprint.d Polymers(MiPs)t. coat.nanozymes represent. an effect.ve approach t. impart.subst.at. ***,several st.aig.t.orward st.pg.p st.at.g.es have been devised t. improve nanozyme specificit. for analyt.cal applicat.ons,such as t.e int.g.at.on of biorecog.it.on element. and nanozyme sensor arrays t.roug. surface modificat.on.

关键词： Nanozymes Enzymes Cat.lyt.c act.vit. Specificit. Perspect.ve