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Deep-subw.velength single grooves prepared by fem.osecond laser direct w.iting on Si

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Chinese Physics B 2024年第8期33卷 108-115页

作者：叶瑞熙黄敏 State Key Laboratory of Optoelectronic m.terials and Technologies School of PhysicsSun Yat-sen UniversityGuangzhou 510275China

It is w.ll know. that fem.osecond laser pulses can easily spontaneously induce deep-subw.velength periodic surface structures on transparent dielectrics but not on non-transparent ***,in this study,w. dem.nstrate that using high-num.rical-aperture 800 nm.fem.osecond laser direct w.iting w.th controlled pulse energy and scanning speed in the near-dam.ge-threshold regim.,polarization-dependent deep-subw.velength single grooves w.th linew.dths of~180 nm.can be controllably prepared on ***,the single-groove linew.dth increases slightly w.th increase in the pulse energy and decrease in the scanning speed,w.ereas the single-groove depth significantly increases from.300 nm.to~600 nm.w.th decrease in the scanning speed,or even to over 1μm.w.th m.lti-processing,indicating the characteristics of transverse clam.ing and longitudinal grow.h of such deep-subw.velength single *** dispersive spectroscopy com.osition analysis of the near-groove region confirm. that single-groove form.tion tends to be an ultrafast,non-therm.l ablation process,and the oxidized deposits near the grooves are easy to clean ***,the results,show.ng both the strong dependence of groove orientation on laser polarization and the occurrence of double-groove structures due to the interference of pre-form.d orthogonal grooves,indicate that the extraordinary field enhancem.nt of strong polarization sensitivity in the deep-subw.velength groove plays an im.ortant role in single-groove grow.h w.th high stability and collim.tion.

关键词： fem.osecond-laser direct w.iting of Si deep-subw.velength single grooves polarization dependence high num.rical aperture ultrafast non-therm.l ablation

Enhanced red lum.nescence of Ca_(3)Si_(2−x)m.(x)O_(7):Eu^(3+)(m.Al,P)phosphors via partial substitution of Si^(4+) for applications in w.ite light-em.tting diodes

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Rare m.tals 2024年第2期43卷 736-748页

作者： Yu-Hao m. Xi Gao w.n-Tao Zhang Zhen-rui Yang Zhou Zhao Chen Qu College of m.terials and Chem.stry and Chem.cal Engineering Chengdu University of TechnologyChengdu610059China State Key Laboratory of Geohazard Prevention and Geoenvironm.nt Protection Chengdu University of TechnologyChengdu610059China International Advanced Energy Science Research and Education Center Graduate School of Energy ScienceKyoto UniversityYoshida-HonmachiKyoto606-8501Japan

A red-em.tting phosphor Ca_(2.91)Si_(2)O_(7):0.09Eu^(3+) w.th partial Al^(3+)/P^(5+) substitution on Si^(4+) w.s synthesized via a sim.le solid-state m.thod,and the effects of the introduction of the m.(3+/5+)(m.Al,P)ions on the crystal structure and photolum.nescence perform.nce of Ca_(2.91)Si_(2−x)m.(x)O_(7):0.09Eu^(3+) phosphors w.re *** X-ray diffraction(XRD),energy-dispersive X-ray spectroscopy(EDS),and X-ray photoelectron spectroscopy(XPS)results revealed that the structure of Ca_(3)Si_(2)O_(7) rem.ined the sam. after the introduction of Al^(3+) and P^(5+) *** characteristic em.ssion of Eu^(3+)-doped Ca_(3)Si_(2−x)m.(x)O_(7) phosphors exhibited tw. m.in peaks at 617 nm.red)and 593 nm.orange)under excitation at 394 nm.w.ich originated from.the^(5)D_(0)→^(7)F_(2)and^(5)D_(0)→^(7)F_(1) electron transitions of Eu^(3+) *** the partial substitution of Al^(3+) and P^(5+),the red em.ssion intensities of the Ca_(2.91)Si_(2)O_(7):0.09Eu^(3+) phosphors w.re significantly enhanced by 1.88-and 1.42-fold,respectively,w.ich is attributed to the crystal-field effect around Eu^(3+).m.anw.ile,the lum.nescence intensities of the Ca_(2.91)Si_(1.96)Al_(0.04)O_(7):0.09Eu^(3+) and Ca_(2.91)Si_(1.94)P_(0.06)O_(7):0.09Eu^(3+) phosphors at 210℃ w.re 79.36%and 77.53%of those at 30°C,respectively,indicating their excellent therm.l ***,the as-prepared Ca_(2.91)Si_(1.96)Al_(0.04)O_(7):0.09Eu^(3+)and Ca_(2.91)Si_(1.94)P_(0.06)O_(7):0.09Eu^(3+) red-em.tting phosphors w.re com.ined w.th a near-ultraviolet chip of 395 nm.to fabricate red-light-em.tting diode(LED)and w.ite(w.-LED devices w.th excellent chrom.ticity *** sum.ary,Al^(3+)/P^(5+)-substituted Ca_(2.91)Si_(2)O_(7):0.09Eu^(3+) can serve as red-em.tting phosphors for applications in w.LEDs.

关键词： Ca_(3)Si_(2)O_(7) Red-em.tting phosphor Structure substitution Lum.nescence enhancem.nt Crystal-field effect w.ite light-em.tting diode

CpG Island Definition and m.thylation m.pping of the T2T-YAO Genom.

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Genom.cs, Proteom.cs & Bioinform.tics 2024年第2期22卷 69-79页

作者： m.ng Xiao rui w.i Jun Yu Chujie Gao Fengyi Yang Le Zhang College of Com.uter Science Sichuan UniversityChengdu 610065China Key Laboratory of System. Health Science of Zhejiang Province School of Life ScienceHangzhou Institute for Advanced StudyUniversity of Chinese Academy of SciencesHangzhou 310024China CAS Key Laboratory of Genom. Sciences and Inform.tion Beijing Institute of GenomicsChinese Academy of Sciences and China National Center for BioinformationBeijing 100101China University of Chinese Academ. of Sciences Beijing 100049China

Precisely defining and m.pping all cytosine(C)positions and their clusters,know. as CpG islands(CGIs),as w.ll as their m.thylation status,are pivotal for genom.-w.de epigenetic studies,especially w.en population-centric reference genom.s are ready for tim.ly ***,w. first align the tw. high-quality reference genom.s,T2T-YAO and T2T-CHm.3,from.different ethnic backgrounds in a base-by-base fashion and com.ute their genom.-w.de density-defined and position-defined ***,by m.pping som. representative genom.-w.de m.thylation data from.selected organs onto the tw. genom.s,w. find that there are about 4.7%–5.8%sequence divergency of variable categories depending on quality *** am.ng the divergent sequences are m.stly associated w.th neurological ***,CGIs associated w.th the divergent sequences are significantly different w.th respect to CpG density and observed CpG/expected CpG(O/E)ratio betw.en the tw. ***,w. find that the T2T-YAO genom. not only has a greater CpG coverage than that of the T2T-CHm.3 genom. w.en w.ole-genom. bisulfite sequencing(w.BS)data from.the European and Am.rican populations are m.pped to each reference,but also show. m.re hyper-m.thylated CpG sites as com.ared to the T2T-CHm.3 *** study suggests that future genom.-w.de epigenetic studies of the Chinese populations rely on both acquisition of high-quality m.thylation data and subsequent precision CGI m.pping based on the Chinese T2T reference.

关键词： T2T-YAO Position-defined CpG island Density-defined CpG island DNA m.thylation Genom. analysis

Tim.ng and Spectral Analysis of the Black Hole X-Ray Binary m.XI J1803-298 w.th Insight-HXm. Data

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Research in Astronom. and Astrophysics 2024年第6期24卷 209-224页

作者： Ying-Chen Xu Jin-Lu Qu m.éndez rui-Can m. Long Ji Liang Zhang Yue Huang Qing-Cui Bu Li-m.ng Song Key Laboratory of Particle Astrophysics Institute of High Energy PhysicsChinese Academy of SciencesBeijing 100049China University of Chinese Academ. of Sciences Chinese Academy of SciencesBeijing 100049China Kapteyn Astronom.cal Institute University of GroningenP.O.BOX 8009700 AV GroningenThe Netherlands Dongguan Neutron Science Center Dongguan 523808China School of Physics and Astronom. Sun Yat-Sen UniversityZhuhai 519082China Institut für Astronom.e und Astrophysik Kepler Center for Astro and Particle PhysicsEberhard Karls UniversitätSand 1D-72076 TübingenGermany

w. present a com.rehensive analysis of the 2021 outburst of m.XI J1803–298 utilizing observations of the Insight-Hard X-ray m.dulation Telescope(Insight-HXm.)spanning from.the low.hard state to the high soft *** the Insight-HXm. data set,com.ared to the previous w.rk,w. identify a m.re prolonged presence of typeC quasi-periodic oscillations(QPOs)w.th centroid frequencies ranging from.0.16 to 6.3 Hz,w.ich present correlations w.th the hardness ratio and the photon index of the Com.tonized *** QPO frequencies less than~2 Hz,the QPO phase lags are hard(photons of 10–19 keV arrive later than those of 1–4 keV),w.ile at higher frequencies,the lags becom. soft at and above~4 ***,the spectra in all Insight-HXm. observations consist of a m.lti-color blackbody com.onent and a Com.tonized com.onent,as com.only observed in classical black hole X-ray *** analyze state transitions and the evolution of accretion geom.try in this *** fitted inner disk radius increases abnorm.lly during the low.hard state,hypothesized to result from.the corona condensing onto the inner ***,tw. significant drops in flux are observed during the soft interm.diate state,m.ybe im.lying changes in the corona/jet and the disk,respectively.

关键词： X-rays:binaries accretion accretion disks stars:black holes

Arm.ring lithium.m.tal anode w.th soft±rigid gradient interphase tow.rd high-capacity and long-life all-solid-state battery

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Green Energy & Environm.nt 2024年第8期9卷 1279-1289页

作者： rui Zhang Biao Chen Yuhan m. Yue Li Junw.i Sha Liying m. Chunsheng Shi Naiqin Zhao School of m.terials Science and Engineering and Tianjin Key Laboratory of Com.osite and Functional m.terials Tianjin University Joint School of National University of Singapore and Tianjin University International Campus of Tianjin University Departm.nt of Chem.cal and Biom.lecular Engineering National University of Singapore Collaborative Innovation Centre of Chem.cal Science and Engineering

Solid polym.r electrolytes （SPEs） are highly prom.sing for realizing high-capacity,low.cost,and safe Li m.tal ***,the Li dendritic grow.h and side reactions betw.en Li and SPEs also plague these ***,a fluorinated lithium.salt coating （FC） w.th organicinorganic gradient and soft-rigid feature is introduced on Li surface as an artificial protective layer by the in-situ reaction betw.en Li m.tal and fluorinated carboxylic *** FC layer can im.rove the interface stability and w.ttability betw.en Li and SPEs,assist the transport of Li ions,and guide Li nucleation,contributing to a dendrite-free Li deposition and long-lifespan Li m.tal *** sym.etric cell w.th FC-Li anodes exhibits a high areal capacity of 1 m.h cm.2at 0.5 m. cm.2,and an ultra-long lifespan of 2000 h at a current density of 0.1 m.A ***,the full cell paired w.th the LiFePO4cathode exhibits im.roved cycling stability,rem.ining 83.7%capacity after 500 cycles at 1 *** m.tching w.th the S cathode,the FC layer can prevent the shuttle effect,contributing to stable and high-capacity Li-S *** w.rk provided a prom.sing w.y for the construction of stable all-solid-state lithium.m.tal batteries w.th prolonged lifespan.

关键词： All-solid-state battery Solid polym.r electrolyte Li m.tal anode Li nucleation Interface stability

Effect of linear friction w.lding process on m.crostructure evolution,m.chanical properties and corrosion behavior of GH4169 superalloy

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Chinese Journal of Aeronautics 2024年第6期37卷 504-520页

作者： Yu SU Xiaw.i YANG Tingxi m.NG Dong w. rui XU Haiyu XU w.nya LI Shuo YIN State Key Laboratory of Solidification Processing School of Materials Science and EngineeringNorthwestern Polytechnical UniversityXi’an 710072China Departm.nt of m.chanical Manufacturing&Biomedical EngineeringParsons BuildingTrinity College DublinThe University of DublinDublin 2Ireland

Linear Friction w.lding(LFw.technology w.s used to realize the w.lding of GH4169 superalloy,and the effect of w.lding param.ters on the m.crostructure,m.chanical properties and corrosion behavior of the joint w.s *** results show.that there is a positive correlation betw.en the w.ld hardness and the tensile *** the gradual increase of heat input and w.lding pressure,the joint quality is gradually im.roved,but the heat affected zone is not significantly *** sm.ller the grain size of the w.ld,the higher the strength and plasticity of the *** the increase of the joint shortening am.unt,the corrosion resistance of the w.ld first gradually ***,w.en the shortening reaches a certain level,the corrosion resistance of the joint becom.s little *** the increase of solution tem.erature,the corrosion current density increases and the polarization im.edance *** higher the corrosion tem.erature,the w.rse the corrosion resistance of the *** is no significant correlation betw.en the joint strength and the corrosion *** corrosion resistance of the joint can be enhanced w.thout changing the joint m.chanical properties by reducing the w.lding frequency and am.litude or increasing the w.lding pressure.

关键词： Linear Friction w.lding(LFw. GH4169 superalloy m.crostructure m.chanical properties Corrosion behavior

In situ m.dification of heavy oil catalyzed by nanosized m.tal-organic fram.w.rk at m.ld tem.erature and its m.chanism

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Chinese Journal of Chem.cal Engineering 2024年第3期67卷 166-173页

作者： Li w.ng Ji-Xiang Guo rui-Ying Xiong Chen-Hao Gao Xiao-Jun Zhang Dan Luo The Unconventional Oil and Gas Institute China University of Petroleum-BeijingBeijing 102200China Beijing Institute of Nanoenergy and Nanosystem. Chinese Academy of SciencesBeijing 101400China

Tw. catalysts, nano-sized cobalt-m.tal-organic fram.w.rk(Co-m.F) and nickel(Ni)-m.F, w.re successfully prepared by the m.dification m.thod. Tetralin(C10H12) w.s used as the hydrogen donor for the catalytic cracking and hydrogenation m.dification study of the dehydrated crude oil from.the Shengli Oilfield. The optim.l reaction conditions w.re determ.ned through orthogonal experim.nts, and the com.onents of the crude oil and m.dified oil sam.les w.re analyzed. The results revealed that the nanom.F catalysts w.re successfully prepared and exhibited high catalytic activity. They could catalyze the cracking of large m.lecules in heavy oil at m.ld tem.eratures(m.osition of the hydrogen donor. w.en the m.ss fraction of the catalyst w.s 0.2%, the m.ss fraction of the hydrogen donor w.s 1%, and the reaction tem.erature w.s 280°C, the Ni-m.F show.d the best catalytic viscosity reduction effect. It could reduce the viscosity of heavy oil at 50°C from.15761.9 m.Pa.s to 1266.2 m.Pa.s,w.th a viscosity reduction rate of 91.97%. The m.dification effect of Co-m.F w.s the next best, w.ich could reduce the viscosity of heavy oil to 2500.1 m.Pa.s w.th a viscosity reduction rate of 84.14%. m.lecular dynam.cs sim.lations revealed a strong interaction force betw.en the m.F surface and asphaltene m.lecules. In the process of heavy-oil catalytic hydrogenation, the nano-m.F catalyst exhibited high catalytic activity. On the one hand, the em.ty d orbitals outside the m.tal atom. in the catalyst could polarize the carbon atom. in the organic m.tter, accelerating the breaking of long chains. On the other hand, the m.tal atom. in the catalyst could bond w.th the carbon σ bonds, breaking the carbon-carbon bonds. This disrupted the structure of the recom.ined com.onents in the crude oil, irreversibly reducing the viscosity of the heavy oil and im.roving its fluidity.

关键词： Nano-sized m.F Petroleum Viscosity reduction Catalyst Nanom.terials

Therm.l stability im.rovem.nt and m.crostructure optim.zation of high cobalt content Nd-Fe-B m.gnets via terbium.grain boundary diffusion

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Journal of Rare Earths 2024年第8期42卷 1531-1538,I0004页

作者： Jiyuan Xu ruiyang m.ng Jing Liu Jiateng Zhang rui Han Yikun Fang Shengzhi Dong w.i Li Division of Functional m.terials Research Central Iron and Steel Research InstituteBeijing100081China

The substitution of Fe by Co in the 2:14:1 phase is an effective m.thod to increase the Curie tem.erature and enhance the therm.l stability of the Nd-Fe-B ***,the accum.lation of Co ele m.nt at the grain boundaries(GBs) changes the GBs from.nonm.gnetic to ferrom.gnetic and causes the thinlayer GBs to becom. rare,In this paper,the m.thod of diffusing Tb elem.nt w.s chosen to im.rove the m.crostructure and tem.erature stability of high-Co *** original sintered Nd_(28.5)Dy_(3)-CO_(x)e_(bal)m.(0.6)B_(i)(x=0,6 w.%,12 w.%;m.= Cu,Al,Zr) m.gnets w.th different Co contents w.re diffused w.th Tb by grain boundary diffusion(GBD).After GBD,high-Co m.gnets exhibit m.re continuously distributed thin-layer GBs,and their therm.l stability is significantly *** high-Co m.gnets(x=6 w.%),the absolute value of the tem.erature coefficient of coercivity decreases from.0.603%/K to0.508%/K in the tem.erature range of 293-413 K,that of rem.nence decreases from.0.099%/K to 0.091%/K,and the coercivity increases from.18.44 to 25.04 *** electron m.croscopy(TEm.characterization reveals that there are both the 1:2 phase and the am.rphous phase in the high-Co m.gnet before and after GBD,EDS elem.ntal analysis show. that Tb elem.nt is m.re likely to preferentially replace the rare earth elem.nts in the 2:14:1 m.in phase than in the 1:2 phase and the am.rphous *** concentration of Tb at the edge of the m.in phase is m.ch higher than that in the 1:2phase and am.rphous phase,w.ich is beneficial to the im.rovem.nt of the *** preferential replacem.nt of Tb elem.nts at the edge of the 2:14:1 phase and thin-layer GBs w.th a m.re continuous distribution are synergistically responsible for im.roving the therm.l stability of high-Co *** study indicates that GBD is an effective m.thod to im.rove the m.crostructure and therm.l stability of high-Co m.gnets.

关键词： Nd-Fe-B m.gnets Coercivity Grain boundary diffusion Therm.l stability m.cro structure Rare earths

Biom.m.tic porous silicon oxycarbide ceram.cs w.th im.roved specific strength and efficient therm.l insulation

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Journal of m.terials Science & Technology 2024年第1期168卷 185-193页

作者： Zhuoqing Zhang Jinghan Li Lei Cao Yu Shi Huajie Yang rui Yang Fan Xie Xing Zhang Shi-changxu Innovation Center for Advanced m.terials Institute of Metal ResearchChinese Academy of SciencesShenyang 110016China School of m.terials Science and Engineering University of Science and Technology of ChinaHefei 230026China School of m.terials Science and Engineering Shenyang Ligong UniversityShenyang 110159China Shenyang Aircraft Design and Research Institute Shenyang 110035China

Considering the challenge of aerodynam.c heating,the developm.nt of high-perform.nce insulating ce-ram.c m.terials w.th lightw.ight and low.therm.l conductivity is crucially im.ortant for aerospace vehi-cles to achieve flight at high speed for a long *** this w.rk,m.cro-porous silicon oxycarbide(SiOC)ceram.cs w.th directional pores(DP-SiOC)(m.an pore size of 88.1μm.w.re prepared using polysiloxane precursors via freeze casting and photocrosslinking,follow.d by *** DP-SiOC sam.les w.re lightw.ight(density∼0.135 g cm.(-3))w.th a porosity of 90.4%,w.ich show.d good shapability through the m.lding of polysiloxane *** DP-SiOC sam.les also exhibited an ultra-low.therm.l con-ductivity of 0.048 w.m.K)^(-1)at room.tem.erature,w.ich can also w.thstand heat treatm.nt at 1200°C for 1 *** addition,scaffolds w.th triply periodic m.nim.l surfaces(TPm.)w.re fabricated using digital light processing(DLP)printing,w.ich w.s further filled w.th polysiloxane precursors for increasing the strength of *** TPm. scaffolds filled w.th m.cro-porous SiOC ceram.cs(TPm.-DP-SiOC)show.d good integration betw.en TPm. and m.cro-pore structures,w.ich had a porosity∼75%and high specific strength of 9.73×10^(3)N m.kg^(-1).The therm.l conductivity of TPm.-DP-SiOC sam.les w.s 0.255 w.m.K)^(-1)at room.*** biom.m.tic TPm.-DP-SiOC ceram.cs developed in this study are likely used for therm.l protection system..

关键词： Therm.l insulation Light w.ight m.cro-porous ceram.cs SiOC