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t.eoret.cal st.dy of superradiant.m.sing wit. solid-st.t. spins at.room.t.m.erat.re

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Science China(Physics,m.chanics & Ast.onom.) 2024年第6期67卷 38-47页

作者： Qilong Wu Yuan Zhang Hao Wu Shi-Lei Su Kai-Kai liu m.rk Oxborrow Chong-Xin Shan Klaus m.lm.r Henan Key Laborat.ry of Diam.nd Opt.elect.onic m.t.rials and Devices Key Laboratory of Material Physics Ministry of EducationSchool of Physics and MicroelectronicsZhengzhou UniversityZhengzhou 450052China Inst.t.t. of Quant.m.m.t.rials and Physics Henan Academy of SciencesZhengzhou 450046China Cent.r for Quant.m.t.chnology Research and Key Laborat.ry of Advanced Opt.elect.onic Quant.m.Archit.ct.re and m.asurem.nt. School of PhysicsBeijing Institute of TechnologyBeijing 100081China Beijing Academ. of Quant.m.Inform.t.on Sciences Beijing 100193China Depart.ent.of m.t.rials Imperial College LondonLondon SW72AZUK Niels Bohr Inst.t.t. University of CopenhagenCopenhagen 2100Denmark

St.ady-st.t. superradiance and superradiant.lasing at.ract.significant.at.ent.ons in t.e field of opt.cal lat.ice clocks,but.have not.been achieved yet.due t. t.e t.chnical challenges and at.m.loss *** t.is art.cle,we propose t.at.t.eir count.r-part.m.y be observed in t.e m.crowave dom.in wit. solid-st.t. spins,i.e.,nit.ogen-vacancy cent.r spins and pent.cene m.lecular spins,coupled t. m.crowave resonat.r at.room.t.m.erat.re wit. realist.c t.chnical *** validat. our proposal,we invest.gat. syst.m.t.cally t.e syst.m.dynam.cs and st.ady-st.t. by solving quant.m.m.st.r equat.ons for t.e m.lt.-level and m.lt.-process dynam.cs of t.illions of *** calculat.ons show t.at.t.e superradiant.Rabi oscillat.ons occur first.y due t. t.ansit.ons am.ng different.Dicke st.t.s,and t.e subsequent.cont.nuous-wave superradiant.m.sing can achieve a linewidt. well below *** work m.y guide furt.er explorat.on of t.ansient.and st.ady-st.t. superradiant.m.sing wit. t.e m.nt.oned and ot.er solid-st.t. spins *** ult.a-narrow linewidt. m.y find applicat.ons in deep-space com.unicat.ons,radio ast.onom. and high-precision m.t.ology.

关键词： solid-st.t. spins superradiance m.ser

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Com.ressive propert. and energy absorpt.on charact.rist.c of int.rconnect.d porous m.-Zn-Y alloys wit. adjust.ng Y addit.on

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Journal of m.gnesium.and Alloys 2024年第1期12卷 171-185页

作者： J.A.liu S.J.liu B.Wang W.B.Sun X.J.liu Z.W.Han College of m.t.rials Science and Engineering Key Laboratory of Automobile Materials(Ministry of Education)Jilin UniversityChangchun 130022PR China Key Laborat.ry of Bionic Engineering(m.nist.y of Educat.on) College of Biological and Agricultural EngineeringJilin UniversityChangchun130022PR China Weihai Inst.t.t. for Bionics-Jilin Universit. Weihai 264205PR China

In t.is st.dy,int.rconnect.d porous m.-2Zn-xY alloys wit. different.phase com.osit.ons were prepared by various Y addit.ons(x=0.4,3,and 6 wt.%)t. adjust.t.e com.ressive propert.es and energy absorpt.on *** charact.rizat.on m.t.ods were t.en applied t. ident.fy t.e m.crost.uct.re of t.e porous m.-Zn-Y and describe t.e det.ils of t.e second *** t.st. were perform.d at.room.t.m.erat.re(Rt.,200℃,and 300℃t. st.dy t.e im.act.of t.e Y addit.on and t.st.ng t.m.erat.re on t.e com.ressive propert.es of t.e porous *** experim.nt.l result. showed t.at.a high Y cont.nt.prom.t.s a m.crost.uct.re refinem.nt.and increases t.e volum. fract.on of t.e second *** t.e Y cont.nt.increases,different.m.-Zn-Y t.rnary phases appear:I-phase(m._(3)Zn_(6)Y),W-phase(m._(3)Zn_(3)Y_(2)),and LPSO phase(m._(12)ZnY).When t.e Y cont.nt.ranges bet.een 0.4%and 6%,t.e com.ressive st.engt. increases from.6.30m.a t. 9.23 m.a,and t.e energy absorpt.on capacit. increases from.7.33 m./m.(3)t. 10.97 m./m.(3)at.Rt.which is m.inly at.ribut.d t. t.e phase com.osit.on and volum. fract.on of t.e second ***,t.e average energy absorpt.on efficiency is independent.of t.e Y *** addit.on,t.e com.ressive deform.t.on behaviors of t.e porous m.-Zn-Y are alt.red by t.e t.st.ng *** com.ressive st.engt. and energy absorpt.on capacit. of t.e porous m.-Zn-Y decrease due t. t.e soft.ning effect.of t.e high t.m.erat.re on t.e *** deform.t.on behaviors at.different.t.m.erat.res are finally observed t. reflect.t.e failure m.chanism. of t.e st.ut..

关键词： Porous m.gnesium Rare eart. elem.nt. m.crost.uct.re Com.ressive behavior Energy absorpt.on charact.rist.c

Hum.n act.vit. over nat.ral input. det.rm.nes t.e bact.rial com.unit. in an ice core from.t.e m.zt.g at. glacier

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Science China Eart. Sciences 2024年第5期67卷 1489-1499页

作者： Yongqin liu Nianzhi JIAO m.kan JI Keshao liu Baiqing XU Bixi GUO t.ndong YAO St.t. Key Laborat.ry of t.bet.n Plat.au Eart. Syst.m Resources and Environment(TPESRE)Institute of Tibetan Plateau ResearchChinese Academy of SciencesBeijing 100101China Cent.r for Pan-t.ird Pole Environm.nt Lanzhou UniversityLanzhou 730013China Universit. of Chinese Academ. of Sciences Beijing 100101China St.t. Key Laborat.ry for m.rine Environm.nt.l Science Xiamen UniversityXiamen 361102China

Ice core provides a valuable vert.cal t.m.line of past.clim.t.s and ant.ropogenic *** proxies have been widely used in t.ese st.dies,but.t.ere are few biological indicat.rs *** address t.is gap,we invest.gat.d t.e bact.rial com.unit. from.a 74 m.ice core of m.zt.g at. glacier on t.e t.bet.n Plat.au t. link biological indicat.rs wit. past.clim.t. and ant.ropogenic *** analyzing t.e port.on of t.e ice core wit. environm.nt.l proxies available(corresponding t. 1907 t. 1991),we observed an increase in bact.rial richness t.roughout.t.e ice core,which was associat.d wit. higher NH_(4)^(+),an indicat.r of agricult.ral *** bact.rial com.unit. was joint.y det.rm.ned by hum.n act.vit.,nat.ral input.and air t.m.erat.re,wit. a st.ong hum.n influence aft.r t.e ***,t.e relat.ve abundance of anim.l gut.associat.d bact.ria,including Aerococcaceae,Nocardiaceae,m.ribaculaceae,and Lachnospiraceae,was associat.d wit. livest.ck num.er changes in t.e Cent.al Asian *** wit. ot.er bact.rial lineages,t.ey joint.y explained 59.8%of t.e livest.ck num.er *** st.dy provides quant.t.t.ve evidence of t.e associat.ons bet.een bact.rial indicat.rs and past.clim.t. and hum.n act.vit.es,highlight.ng t.e pot.nt.al of using bact.rial proxies for ice core st.dies.

关键词： Ice core of m.zt.g at. glacier Clim.t. change and ant.ropogenic act.vit. Biological indicat.r Gut.associat.d bact.ria livest.ck num.er in t.e Cent.al Asian region

Solidificat.on/St.bilizat.on of Chrom.um.in Red m.d-based Geopolym.r

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Journal of Wuhan Universit. of t.chnology(m.t.rials Science) 2024年第4期39卷 819-830页

作者：田崇霏 LUO Zhongt.o liu Lei liu Xiaohai 张美香陈萌 HAI Ran School of m.t.rials Science and Engineering Zhengzhou UniversityZhengzhou 450001China Henan Renbang t.chnology Co. Ltd.Luoyang 471700China School of Wat.r Conservancy and Civil Engineering Zhengzhou UniversityZhengzhou 450001China School of Archit.ct.ral and Civil Engineering Zhongyuan University of TechnologyZhengzhou 450007China

Up t. 1.5wt.of Cr(Ⅲ)salt.(CrCl_(3),and Cr_(2)O_(3))and Cr(Ⅵ)salt.(Na_(2)CrO_(4),and CaCr_(2)O_(7))were incorporat.d int. red m.d-based geopolym.rs,*** solidificat.on/st.bilizat.on,com.ressive st.engt.,and durabilit. of t.e Cr-cont.ining geopolym.rs were *** experim.nt.l result. indicat. t.at.t.e red m.d-based geopolym.r could effect.vely solidify/st.bilize different.t.pes of Cr salt. wit. solidificat.on/st.bilizat.on rat.s of above 99.61%.Geopolym.rs are environm.nt.lly safe when t.e dosage of CaCr_(2)O_(7)is≤1.0wt.,or t.e dosage of CrCl_(3),Cr_(2)O_(3),and Na_(2)CrO_(4)is≤1.5wt.,*** effect. of Cr salt. on t.e com.ressive st.engt. varies wit. t.e t.pe and cont.nt.of Cr *** freeze-t.aw cycle is m.re dest.uct.ve t. geopolym.r propert.es t.an sulfat. at.ack or acid rain *** solidificat.on/st.bilizat.on of Cr is m.inly at.ribut.d t. t.e following reasons:a)t.e chem.cal binding of Cr is relat.d t. t.e form.t.on of Cr-cont.ining hydrat.s(eg,m.gnesiochrom.t.((m.,Fe)(Cr,Al)_(2)O_(4)))and doping int. N-A-S-H gel and C-A-S-H gel fram.work;b)t.e physical effect.is relat.d t. t.e encapsulat.on by t.e hydrat.on product.(e g,N-A-S-H gel and C-A-S-H gel).t.is st.dy provides a reference for t.e t.eat.ent.of hazardous Cr-cont.ining wast.s by solid wast.-based geopolym.rs.

关键词： chrom.um solidificat.on/st.bilizat.on geopolym.r red m.d durabilit.

Predict.on of bedload t.ansport.inside veget.t.on canopies wit. nat.ral m.rphology

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Journal of Hydrodynam.cs 2024年第3期36卷 556-569页

作者： Li He Yu-qi Shan Chao liu Hui Cao Xing-nian liu Yakun Guo St.t. Key Laborat.ry of Hydraulics and m.unt.in River Engineering Sichuan UniversityChengdu610065China Inst.t.t. for Disast.r m.nagem.nt.and Reconst.uct.on Sichuan UniversityChengdu610065China China Yangt.e Power Co. Ltd.Yichang443002China Hubei Key Laborat.ry of Int.lligent.Yangt.e and Hydroelect.ic Science Yichang443002China Facult. of Engineering and Inform.t.cs University of BradfordBradfordUK

Due t. veget.t.on drag and veget.t.on-generat.d t.rbulence,bedload t.ansport.in veget.t.d channels is m.re com.licat.d t.an t.at.in nonveget.t.d *** is challenging t. obt.in accurat. predict.ons of bedload t.ansport.in veget.t.d *** st.dies generally used rigid circular cylinders t. sim.lat. veget.t.on,and t.e im.act.of plant.m.rphology on bedload t.ansport.was t.pically ignored;t.ese m.t.ods deviat. from.nat.ral scenarios,result.ng in predict.on errors in t.ansport.rat.s of m.re t.an an order of *** st.dy m.asured bedload t.ansport.rat.s inside ***,*** and *** canopies and in arrays of rigid cylinders for *** im.act.of plant.m.rphology on bedload t.ansport.in veget.t.d channels was *** t.e canopies of nat.ral m.rphology,t.e prim.ry fact.r driving bedload t.ansport.is t.e near-bed t.rbulent.kinet.c energy(t.E),which consist. of bot. bed-generat.d and veget.t.on-generat.d t.rbulence.A m.t.od was proposed t. predict.t.e near-bed t.E inside canopies wit. nat.ral *** t.e sam. solid volum. fract.on of plant.,t.e t.ansport.rat. inside canopies wit. a nat.ral m.rphology is great.r t.an or equal t. t.at.wit.in an array of rigid cylinders,depending on t.e plant.*** finding indicat.s t.at.plant.m.rphology has a significant.im.act.on t.ansport.rat.s in veget.t.d regions and cannot.be ignored,which is t.pical in *** classic bedload t.ansport.equat.ons(t.e m.yer-Pet.r-m.ller,Einst.in,Engelund and Dou equat.ons),which are suit.ble for bare channels(no veget.t.on),were m.dified in t.rm. of t.e near-bed *** predict.d near-bed t.E was insert.d int. t.ese four equat.ons t. predict.t.e t.ansport.rat. in canopies wit. nat.ral m.rphology.A com.arison of t.e predict.ons indicat.d t.at.t.e m.yer-Pet.r-m.ller equat.on had t.e highest.accuracy in predict.ng t.e t.ansport.rat. in veget.t.d landscapes.

关键词： Veget.t.d landscapes t.rbulent.kinet.c energy(t.E) bedload t.ansport plant.m.rphology predict.ve m.t.ods

Relat.ve Broken Fam.ly Sensit.vit.

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Act. m.t.em.t.ca Sinica,English Series 2024年第9期40卷 2297-2306页

作者： Zhuo Wei liu t.o YU Depart.ent.of m.t.em.t.cs Shantou UniversityShantou 515063P.R.China

Let.:(X,t.→(Y,S)be a fact.r m.p bet.een t.o t.pological dynam.cal syst.m.,and F_(a) Furst.nberg fam.ly of *** int.oduce t.e not.on of relat.ve broken *** Fs(***,Finf)be t.e fam.lies consist.ng of all syndet.c subset.(*** upper Banach densit. subset.,infinit. subset.).We show t.at.for a fact.r m.pπ:(X,t.→(Y,S)bet.een t.ansit.ve syst.m.,πis relat.vely broken F-sensit.ve for F=Fs or Fpubd if and only if t.ere exist. a relat.ve sensit.ve pair which is an F-recurrent.point.of(R_(π),t.((2)));is relat.vely broken Finf-sensit.ve if and only if t.ere exist. a relat.ve sensit.ve pair which is not.*** a fact.r m.pπ:(X,t.→(Y,S)bet.een m.nim.l syst.m.,we get.t.e st.uct.re of relat.ve broken F-sensit.vit. by t.e fact.r m.p t. it. m.xim.l equicont.nuous fact.r.

关键词： Relat.ve sensit.vit. recurrent.point. Furst.nberg fam.ly relat.ve sensit.ve pairs m.xim.l equicont.nuous fact.r

A t.m.-dependent.lum.nescent.phosphor of Na_(2)Ba_(2)Si_(2)O_(7):Eu for m.lt.-level encrypt.on and dynam.c inform.t.on display

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Journal of Advanced Ceram.cs 2024年第4期13卷 429-436页

作者： Jie Shao Xiyang Li m.ng liu Haiqin Sun Qiwei Zhang Dengfeng Peng Fuchi liu College of Physics and t.chnology Guangxi Normal UniversityGuilin 541004China Guangxi Key Laborat.ry of Nuclear Physics and t.chnology Guangxi Normal UniversityGuilin 541004China Key Laborat.ry of Opt.elect.onic Devices and Syst.m. of m.nist.y of Educat.on and Guangdong Province College of Physics and Optoelectronic EngineeringShenzhen UniversityShenzhen 518060China

Phot.-st.m.li responsive m.t.rials show great.pot.nt.al in t.e fields of inform.t.on encrypt.on and st.rage due t. t.eir dist.nct.ve spat.al or t.m.oral color ***,t.e convent.onal single or m.lt.-color st.t.c out.ut. by light.st.m.lus difficult. m.et.pract.cal requirem.nt. for high-securit. opt.cal st.rage ***,a novel dynam.c irradiat.on-responsive phosphor of Na_(2)Ba_(2)Si_(2)O_(7):Eu is dem.nst.at.d,exhibit.ng high st.rage st.bilit. and convenient.readout.*** inherent.Eu^(2+)lum.nescence can be dynam.cally t.ned,inst.nt.y read out.and convenient.y erased by cont.olling irradiat.on durat.on of a port.ble diode laser(365 nm..t.e m.dulat.on m.chanism.is unraveled by opt.cally induced oxidat.on react.ons of Eu^(2+)→Eu^(3+)and defect. as killer *** excellent.lum.nescence m.dulat.on degree(ΔR_(t.=89.5%)and t.e accom.anying larger color cont.ast.enable t.e creat.on of invisible opt.cal codes wit. m.lt.-level encrypt.on in bright.or dark *** result. indicat. pot.nt.al applicat.ons of Na_(2)Ba_(2)Si_(2)O_(7):-based m.t.rials in inform.t.on encrypt.on and invisible opt.cal st.rage,and are expect.d t. expand m.re invest.gat.ons on opt.cally induced PL m.dulat.on behaviors based on m.xed valences and defect..

关键词： light.irradiat.on lum.nescent.m.dulat.on invisible opt.cal st.rage

Single-st.p-et.hed ult.a-com.act.m.t.m.t.rial grat.ng coupler enabled by a hierarchical inverse design approach

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Science China(Physics,m.chanics & Ast.onom.) 2024年第2期67卷 119-126页

作者： Qiao Wang Ruiqi Luo Nan liu m.ojing Hou Bo Xiong Guandong liu Wei m. Int.lligent.Net.ork Research Inst.t.t. Zhejiang LabHangzhou 311100China St.t. Key Laborat.ry of m.dern Opt.cal Inst.um.nt.t.on College of Information Science and Electronic EngineeringZhejiang UniversityHangzhou 310027China

Wit. t.e concept.of m.t.m.t.rials int.oduced int. int.grat.d phot.nics,subwavelengt. st.uct.res have gained popularit. for t.eir abilit. t. creat. devices wit. ult.a-com.act.size,high perform.nce,and versat.le ***,t.adit.onal m.t.m.t.rial design m.t.ods are usually based on em.irical t.m.lat.s and physical approxim.t.ons,lacking t.e abilit. t. design free-form.m.t.m.t.rial st.uct.res and opt.m.ze ent.re devices *** t.is work,we propose a hierarchical inverse design approach t.at.com.ines a convent.onal effect.ve refract.ve index based m.t.m.t.rial st.uct.res design wit. a follow-up global t.pology *** em.irical m.t.m.t.rial grat.ng coupler design based on effect.ve refract.ve index engineering faces inaccurat. index ext.act.on and insufficient.approxim.t.on of wavevect.r m.t.hing condit.ons,which det.riorat.s coupling efficiency,especially for fully-et.hed devices wit. t.e decreased t.pering ***,a subsequent.overall t.pology opt.m.zat.on st.p can well com.ensat. for t.e negat.ve effect.of t.e shrinking device foot.rint.t. increase t.e efficiency of t.e m.t.m.t.rial grat.ng *** dem.nst.at. a 23μm.10μm.ult.a-com.act.m.t.m.t.rial grat.ng coupler wit. single-st.pet.hed t. couple light.bet.een a fiber and a 500 nm.single-m.de silicon waveguide in t.e *** m.asurem.nt.shows an insert.on loss of 3.17 dB and a 3 dB bandwidt. of 77 nm.m.king it.t.e sm.llest.foot.rint.device ever report.d.

关键词： waveguide hierarchical inverse

Failure evaluat.on and cont.ol fact.r analysis of slope block inst.bilit. along t.affic corridor in Sout.east.rn t.bet

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Journal of m.unt.in Science 2024年第6期21卷 1830-1848页

作者： liu Changqing BAO Han LAN Hengxing YAN Changgen LI Changbo liu Shijie School of Highway Chang'an UniversityXi'an 710064China St.t. Key Laborat.ry of Resources and Environm.nt.l Inform.t.on Syst.m Institute of Geographic Sciences and Natural Resources ResearchChinese Academy of SciencesBeijing 100101China College of Geological Engineering and Geom.t.cs Chang'an UniversityXi'an 710054China

t.e inst.bilit. of slope blocks occurred frequent.y along t.affic corridor in Sout.east.rn t.bet.t.St.,which was prim.rily cont.olled by t.e rock m.ss st.uct.res.A rapid m.t.od evaluat.ng t.e cont.ol effect. of rock m.ss st.uct.res was proposed t.rough field st.t.st.cs of t.e slopes and rock m.ss st.uct.res along t.St.which com.ined t.e st.reographic project.on m.t.od,m.dified m.JCS m.del,and lim.t.equilibrium.*** inst.bilit.es of slope blocks along t.St.were t.en evaluat.d rapidly,and t.e different.cont.ol fact.rs of inst.bilit. were *** showed t.at.t.e probabilit.es of t.ppling(5.31%),planar(16.15%),and wedge(35.37%)failure of slope blocks along t.St.increased *** inst.bilit. m.des were respect.vely cont.olled by t.e ant.-dip joint.t.e joint.parallel t. slope surface wit. a dip angle sm.ller t.an t.e slope angle(singlejoint.,and t.o groups of joint. inclined out.of t.e slope(double-joint.).Regarding t.e cont.ol effect. on slope block inst.bilit.,t.e st.bilizat.on abilit. of doublejoint.(72.7%),ant.-dip joint.67.4%),and single-joint.57.6%)decreased sequent.ally,result.ng in different.probabilit.es of slope block ***,nearby regional fault. significant.y influenced t.e joint.,leading t. spat.al het.rogeneit. and segm.nt.l clust.ring in t.e st.bilizat.on abilit. provided by joint. t. t.e slope ***,t.e st.bilit. of slope blocks gradually weakened as t.ey approached t.e fault.*** paper can provide guidance and assist.nce for invest.gat.ng t.e developm.nt.charact.rist.cs of rock m.ss st.uct.res and t.e st.bilit. of slope blocks.

关键词： Slope engineering Block inst.bilit. Rapid evaluat.on m.t.od Rock m.ss st.uct.re Cont.ol fact.r