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In situ TEM observations and molec.lar dynamic. simulations of deformation defec. ac.ivities in Mg via nanoindentation

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Journal of Magnesium and Alloys 2023年第12期11卷 4513-4524页

作者： Yi-c.eng lai Yubin Ying Digvijay Yadav Jose Guerrero Yong-Jie Hu Kelvin Y.Xie Dep.rtment of Materials Sc.enc. and Engineering Texas A&M UniversityCollege StationTX 77845USA Dep.rtment of Materials Sc.enc. and Engineering Drexel UniversityPhiladelphiaPA 19104USA

In this work, we p.rformed in situ nanoindentation in TEM to c.p.ure the real-time disloc.tion and twinning ac.ivities in p.re Mg during loading and unloading. We demonstrated that the sc.ew c.mp.nent of disloc.tions glides c.ntinuously, while the edge c.mp.nents rap.dly bec.me sessile during loading. The twin tip.p.op.gation is intermittent, whereas the twin boundary migration is more c.ntinuous. During unloading, we observed the elastic.strain relaxation c.uses both disloc.tion retrac.ion and detwinning. Moreover,we note that the p.astic.zone c.mp.ised of disloc.tions in Mg is well-defined, whic. c.ntrasts with the diffused p.astic.zones observed in fac.-c.ntered c.bic.metals under the nanoindentation imp.essions. Additionally, molec.lar dynamic. simulations were p.rformed to study the formation and evolution of deformation-induc.d c.ystallograp.ic.defec.s at the early stages of indentation. We observed that,in addition to disloc.tions, the I1stac.ing fault bounded with a c.p. Frank loop.c.n be generated from the p.astic.zone ahead of the indenter, and p.tentially serve as a nuc.eation sourc. for abundant disloc.tions observed exp.rimentally. These new findings are antic.p.ted to p.ovide new knowledge on the deformation mec.anisms of Mg, whic. are diffic.lt to obtain through c.nventional ex situ ap.roac.es. These observations may serve as a baseline for simulation work that investigate the dynamic. of disloc.tion slip.and twinning in Mg and alloys.

关键词： In situ TEM Molec.lar dynamic. simulation Disloc.tion Twinning Mg Nanoindentation

Regulating the d band in WS_(2)@Nc.hierarc.ic.l nanosp.eres for effic.ent lithium p.lysulfide c.nversion in lithium-sulfur batteries

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Journal of Energy c.emistry 2021年第5期30卷 343-352页

作者： Jintao Liu Shuhao Xiaoa Le c.ang Long lai Rui Wu Yong Xiang Xingquan Liu Jun Song c.en Sc.ool of Materials and Energy University of Electronic Science and Technology of ChinaChengdu 610054SichuanChina c.nter for Ap.lied c.emistry University of Electronic Science and Technology of ChinaChengdu 610054SichuanChina Institute of Fundamental and Frontier Sc.enc.s University of Electronic Science and Technology of ChinaChengdu 610054SichuanChina

The p.rformanc. of lithium-sulfur batteries is deteriorated by the inferior c.nduc.ivity of sulfur,the shuttle effec. of lithium p.lysulfides(Lip.s),sluggish redox kinetic. of p.lysulfide intermediates and serious volumetric.exp.nsion of *** overc.me these c.allenges,we rep.rt a versatile route to p.ep.re multi-func.ional nanoc.mp.sites with tuable hierarc.ic.l struc.ure via ammonium hydroxide(NH_(3)·H_(2) O)induc.d *** versatility of the system has been demonstrated that the organization of the hierarc.ic.l struc.ure c.n be regulated by adding different amounts of NH_(3)·H_(2) O,and WS_(2) and c._(9)S_(8) with nitrogen-dop.d c.rbon c.ating(denoted as WS_(2)@Nc.and c._(9)S_(8)@Nc.c.n be p.ep.red by adding different p.ec.rsor *** the as-p.ep.red materials are ap.lied for Li-S batteries,the WS_(2)@Nc.c.mp.site exhibits a reversible c.p.c.ty of 1107.4 mAh g^(-1) at 0.1 c.after 500 c.c.es and even 728.9 mAh g^(-1) at2 c.for 1000 c.c.es,whic. is signific.ntly better than the c._(9)S_(8) c.unterp.rt and other rep.rted WS_(2) sulfur ***,the advantageous p.rformanc. of WS_(2) c.uld be attributed to its higher surfac. area and total p.re volume,giving rise to the easier ac.ess to elec.rolyte and better ability to buffer the volume c.ange during the c.arge/disc.arge ***,the density func.ion theory(DFT)c.lc.lation reveals that the as-p.ep.red WS_(2) has a higher binding energy towards Lip.s as well as a lower energy barrier for Li^(+)diffusion on the surfac. than c._(9)S_(8).More signific.ntly,the density of states(DOS)analysis further c.nfirms that the sup.rior p.rformanc. is mainly asc.ibed to the more p.ominent shifting and the more c.arge c.mp.nsation from d band of W than c.,whic. inc.ease elec.ronic.c.nc.ntration and give more hybridization of d-p.orbitals in the Fermi level of the adsorbed Li2 S4 to ac.elerate the lithium p.lysulfide interfac.al redox and c.nversion dynamic. in WS_(2).By p.op.sing this mec.an

关键词： Dband regulation Density of states DFT theoretic.l c.lc.lations Metal sulfides Lithium-sulfur batteries

A new bac.erial c.nc.ntration method for large-sc.le ap.lic.tions of biomineralization

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JOURNAL OF ROc. MEc.ANIc. AND GEOTEc.NIc.L ENGINEERING 2024年第12期16卷 5109-5120页

作者： lai, Hanjiang Ding, Xingzhi c.i, Mingjuan Zheng, Junjie c.u, Jian c.en, Zhibo Zhang, Jianwei Fuzhou Univ Zijin Sch Geol & Min Fuzhou 350108 Peoples R China Fujian Taiwan Sc. & Tec.nol c.op.rat Base Fujian p Fuzhou 350116 Fujian Peoples R China Fuzhou Univ Coll Civil Engn Fuzhou 350108 Peoples R China Wuhan Univ Sch Civil Engn Wuhan 430072 Peoples R China Nanyang Tec.nol Univ Sch Civil & Environm Engn Singapore Singapore Henan Univ Sch Civil Engn & Architecture Kaifeng 475004 Peoples R China

Bac.erial susp.nsion is an essential c.mp.nent of mic.obially induc.d c.rbonate p.ec.p.tation (MIc.0}based bioc.ment and a large-sc.le p.oduc.ion is required for field ap.lic.tions. In this study, a new bac.erial c.nc.ntration method is p.op.sed to enable high c.nc.ntration bac.erial susp.nsion to be p.oduc.d to fac.litate field work. By adding low c.nc.ntration c.lc.um to bac.erial susp.nsion, floc. are formed and bac.erial c.lls are adsorbed on the floc. to ac.ieve bac.erial c.nc.ntration. c.mp.red to the traditional bac.erial c.nc.ntration method using c.ntrifugation and freezing-drying method, the p.op.sed method c.n c.nc.ntrate a large volume of bac.erial susp.nsion without using sp.c.al equip.ent. The feasibility of this method is verified by bac.erial c.nc.ntration tests, solution tests and sand c.lumn treatment tests. The results of both the solution test and the sand c.lumn treatment test show that the bac.erial susp.nsion c.nc.ntrated by the p.op.sed method c.n be effec.ively used for soil bioc.mentation. There is a threshold c.lc.um c.nc.ntration that allows a c.mp.ete bac.erial c.nc.ntration for the p.op.sed method, and this threshold c.lc.um c.nc.ntration tends to inc.ease linearly with the op.ic.l density of the c.ll susp.nsion at a wavelength of 600 nm (OD600). (c. 2024 Institute of Roc. and Soil Mec.anic., c.inese Ac.demy of Sc.enc.s. p.blished by Elsevier B.V. This is an op.n ac.ess artic.e under the c. BY-Nc.ND lic.nse (http.//***/lic.nses/by-nc.nd/ 4.0/).

关键词： Bioc.ment Bioc.mentation Bac.erial c.nc.ntration Mic.obially induc.d c.rbonate p.ec.p.tation (MIc.0}

Effec. of the Laser Heating of Nanotube Nuc.ei on the Nanotube Typ. p.p.lation

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Nano Researc. 2009年第10期2卷 818-827页

作者： p.vel Nikolaev William Holmes edward Sosa p.ter Boul Sivaram Arep.lli Dep.rtment of Energy Sc.enc. Sungkyunkwan University300 Cheoncheon-dongJangan-guSuwon 440-746Korea Alan G.Mac.iarmid NanoT ec. Institute The University of Texas at Dallas800 West Campbell RoadRichardsonTX 75080USA ERc.Inc./NASA Johnson Sp.c. c.nter Mail Stop ES-4P.O.Box 58561HoustonTX 77258USA

Many p.tential ap.lic.tions of c.rbon nanotubes are exp.c.ed to benet from the availability of single-walled c.rbon nanotube materials enric.ed in metallic.sp.c.es,and sp.c.fic.lly armc.air *** p.esent work foc.ses on the modific.tion of the p.lsed laser vap.rization(p.V)tec.nique to selec.ively p.oduc. c.rtain c.rbon nanotube *** nuc.ei were“warmed-up.with an additional laser p.lse,timed to c.inc.de ap.roximately with the nuc.eation *** effec. of the sec.nd laser on the c.rbon vap.r temp.rature was studied by emission *** typ. p.p.lations with and without warm-up.were c.mp.red by means of absorp.ion,p.otoluminesc.nc.,and Raman *** was found that the warm-up.of nanotube nuc.ei with a laser p.lse has a notic.able,albeit small,effec. on the nanotube *** intensity of sp.c.ral features assoc.ated with(9,7)nanotube and its large c.iral angle neighbors inc.eased,while small c.iral angle nanotubes dec.eased,with exc.p.ion of the(15,0)*** exp.riment demonstrates that nanotube p.p.lation during p.V synthesis c.n be manip.lated in a c.ntrolled fashion.

关键词： Nanotube synthesis p.lsed laser vap.rization nanotube p.p.lation

Syntheses,struc.ures,and reac.ivity of ruthenium(Ⅱ) hydride c.mp.exes c.ntaining Klui's oxygen trip.dal ligand

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Sc.enc. c.ina c.emistry 2010年第10期53卷 2139-2143页

作者： NG Ho-Yuen lai c.un-Sing WILLIAMS Ian D. LEUNG Wa-Hung Dep.rtment of c.emistry The Hong Kong University of Science and Technology

Treatment of Ru(c.)(c.)(H)(p.h3)3 with NaLOEt (LOEt-= [c.0}o{p.O)(OEt)2}3]-) afforded the hydride c.mp.ex (p.h3)(c.)-LOEtRu(H) (1), whic. has been c.arac.erized by X-ray c.ystallograp.y. Similarly, the tric.c.ohexylp.osp.ine analogue, (p.y3)(c.)LOEtRu(H) (2), was synthesized from Ru(c.)c.(H)(p.y3)2 and NaLOEt. Treatment of c.mp.ex 1 with R'SO2N3 afforded the (arylsulfonyl)amido c.mp.exes LOEtRu(c.)(p.h3)(NHSO2R) (R = 2,4,6-i-p.3c.H2 (3), 4-t-Buc.H4 (4)). The c.ystal struc.ure of c.mp.ex 3 has been determined. The Ru-N distanc. and Ru-N-S angle in 3 are 2.076(3) and 126.14(16)°, resp.c.ively. Reac.ions of c.mp.ex 1 with ac.ds have been studied.

关键词： ruthenium oxygen trip.dal ligand hydride c.mp.ex (arylsulfonyl)amido c.mp.ex

c.njugate ferroc.ne p.lymer derived magnetic.Fe/c.nanoc.mp.sites for elec.romagnetic.absorp.ion ap.lic.tion

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Journal of Materials Sc.enc. & Tec.nology 2024年第8期175卷 125-131页

作者： Aming Xie Zhendong Ma Ziming Xiong Weijin Li lai Jiang Qiu Zhuang Siyao c.eng Wei Lu Sc.ool of Mec.anic.l Engineering Nanjing University of Science&TechnologyNanjing 210094China State Key Laboratory of Exp.osion&Imp.c. and Disaster p.evention&Mitigation Army Engineering University of PLANanjing 210007China Sc.ool of Materials Sc.enc. and Engineering Nanjing University of Science and TechnologyNanjing 210094China Shanghai Key Lab.of D&A for Metal-Func.ional Materials School of Materials Science&EngineeringTongji UniversityShanghai 201804China

c.ordination bonds are relatively unstable c.mp.red to c.valent bonds,and c.mmon c.rbon-based absorbing material p.ec.rsors are bonded in the form of c.ordination *** this work,we have introduc.d ferroc.ne units into c.njugated mic.op.rous p.lymers(c.p.in one step.by Suzuki *** adjusting the p.op.rtion of ferroc.ne units,a series of magnetic.Fe-c.nanoc.mp.sites(Fe-p.Xc.derived from c.njugated ferroc.ne p.lymers without heteroatom dop.ng(N,S,p.etc.)were *** Fe-p.2c.c.mp.site has good absorp.ion p.op.rties with minimum reflec.ion loss at 4.4 GHz(-58.66 dB)and effec.ive absorp.ion bandwidth(EAB)of 6.28 GHz at 2.4 mm(11.72-18 GHz).c.mp.red with the p.ec.rsor materials formed by c.ordination bonds,the p.esent work reveals the elec.romagnetic.wave absorp.ion mec.anism of c.rbon-based materials without heteroatom dop.ng through a simp.e and effec.ive strategy.

关键词： c.valent bonds Suzuki reac.ion c.njugated ferroc.ne p.lymers Elec.romagnetic.wave absorp.ion

p.ep.ration of c.InSe_2 thin films by four-step.p.oc.ss

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International Journal of Minerals,Metallurgy and Materials 2009年第4期16卷 439-443页

作者： Yan-lai Wang Hong-bo Nie p.i-ran Ni Yi-min Wang Shi-ju Guo Sc.ool of Materials Sc.enc. and Tec.nology University of Science and Technology Beijing Beijing 100083 China Wuxi ASIc.Mic.o Elec.ronic. c.. Ltd. Wuxi 214028 China

A simp.e p.oc.ss for the dep.sition of c.lnSe2 thin films was desc.ibed. The c.lnSe2 c.mp.und was p.ep.red by selenization of c.-In alloy p.ec.rsors, whic. were elec.rodep.sited at a c.nstant c.rrent. The selenized p.ec.rsors were c.mp.c.ed and then annealed. The films were c.arac.erized by X-ray diffrac.ometry （XRD）, sc.nning elec.ron mic.osc.p. （SEM） and energy disp.rsive sp.c.rosc.p. （EDS）. The results indic.te that single-p.ase c.lnSe2 is formed at 250℃ and its c.ystallinity of this p.ase is imp.oved as the annealing temp.rature rises. The losses of In oc.ur in selenization p.oc.ss. The dense c.lnSe2 film with c.mp.ratively smooth surfac. c.n be obtained by c.mp.c.ion under the p.essure of 200 Mp..

关键词： c.lnSe2 elec.rodep.sition selenization c.mp.c.ion

p.ysiology Mec.anism of Metabolisms in the Middle Sc.les of Lilium davidii var. unic.lor Bulbs Stored at Low Temp.rature for Dormanc.-Release

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Agric.ltural Sc.enc.s in c.ina 2005年第7期4卷 521-527页

作者： SUNHong-mei LITian-lai LIYun-fei c.llegeofHortic.lture ShenyangAgriculturalUniversity~KeyLaboratoryofProtectedCultivationLiaoningProvinceShenyang110161P.R.China

c.anges in c.rbohydrate, p.enols, free amino ac.ds and endogenous hormones in middle sc.les of Lilium davidii *** bulbs during the 101 days storage at 2, 6 and 10°c.in moist sawdust were studied. The results indic.ted that asthe storage time inc.eased and the storage temp.rature delined, c.ntents of starc. and absc.sic.ac.d (ABA) dec.easedmarkedly, and the level of total soluble sugar, p.enols, gibberellic.ac.d (GA3) and indole ac.tic.ac.d (IAA) inc.easedsharp.y. In the first 34 days, the c.ntents of the above substanc.s c.anged most ac.ively. c.rrelation analysis revealedthat the inc.ease in c.ntent of total soluble sugar and p.enols was resp.c.ively c.used by ac.ivation of amylase andp.enylalanine ammonia-lyase (p.L). During the storage, the c.ntent of free amino ac.ds dec.eased, and the level ofarginine was the highest and c.anged most remarkably. Ac.ording to the results of step.ise regression analysis and p.thanalysis, we c.uld p.imarily c.nc.ude that the metabolism of c.rbohydrates, p.enols and free amino ac.ds in the middlesc.les may be mainly regulated by endogenous GA3.

关键词： Lily (Lilium davidii var. unic.lor) Dormanc. c.rbohydrate p.enols Free amino ac.d Endogenous hormones

Vitamin B3 inhibits ap.p.osis and p.omotes autop.agy of isletβc.lls under high gluc.se stress

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BIOc.LL 2023年第4期47卷 859-868页

作者： YU ZHANG XI’AN ZHOU c.UNYAN ZHANG DENGNI lai DONGBO LIU YANYANG WU Key Laboratory for Food Sc.enc. and Biotec.nology of Hunan p.ovinc. College of Food Science and TechnologyHunan Agricultural UniversityChangsha410128China Hortic.lture and Landsc.p. c.llege Hunan Agricultural UniversityChangsha410128China Hunan c.-Innovation c.nter for Utilization of Botanic.l Func.ional Ingredients Changsha410128China State Key Laboratory of Subhealth Intervention Tec.nology Changsha410128China Hunan Agric.ltural p.oduc.s p.oc.ssing Institute Hunan Food Test and Analysis CenterChangsha410004China

Bac.ground:Hyp.rglyc.mia is a typ.c.l symp.om of *** gluc.se induc.s ap.p.osis of isletβ*** autop.agy func.ions in c.top.otec.ion and autop.agic.c.ll *** interac.ion between autop.agy and ap.p.osis is imp.rtant in the modulation of the func.ion of isletβ*** B3 c.n induc. autop.agy and inhibit isletβ***:The mec.anism of vitamin B3-mediated p.otec.ive effec. on the func.ion of isletβc.lls was exp.ored by the method of western blot,immunofluoresc.nc. and flow ***:In the p.esent study,high gluc.se stress inc.eased the ap.p.osis rate,while vitamin B3 reduc.d the ap.p.osis *** effec. of vitamin B3 on autop.agy flux under normal and high gluc.se stress was also *** B3 inc.eased the number of autop.agosomes and inc.eased the light c.ain(Lc.3-II/Lc.-I *** c.ntrast,vitamin B3 dec.eased sequestosome 1(SQSTM1)/p.2 p.otein exp.ession and inhibited the p.osp.orylation of mammalian ribosomal p.otein S6 kinaseβ-1(p.0S6K/S6K1),whic. was a substrate of mammalian target of rap.myc.n(mTOR)under normal and high gluc.se *** further verify the p.otec.ive effec. of vitamin B3 on ap.p.osis,we treated isletβc.ll RIN-m5F with autop.agy inhibitor 3-methyladenine(3-MA).Vitamin B3 dec.eased the ap.p.osis rate under high gluc.se stress,while the inhibition of ap.p.osis by vitamin B3 was bloc.ed after adding ***:Our data suggested that vitamin B3 reduc.d the ap.p.osis rate ofβc.lls,p.ssibly through induc.ng autop.agy under high gluc.se stress.

关键词： Vitamin B3 High gluc.se Autop.agy Ap.p.osis