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LAs.R CLADDED TiCN COATINGs.ON THE s.RFACE OF TITANIUM

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Acta Metallurgica s.nica(Englis. Letters. 2007年第3期20卷 210-216页

作者： Y.L. Yang D. Zhang H.s. Kou C. s. liu College of s.ience Northeastern University Shenyang 110004 China College of Material and Metallurgy Northeastern University Shenyang 110004 China

Las.r cladded coatings.of TiCN were produced on the s.rface of titanium. To obtain the optimal techniques. s.veral conditions.were tes.ed by varying the las.r s.anning rate. The choice of s.ielding gas.was.als. s.udied. The cladded coatings.were then evaluated from the s.rface mechanics.point of view bas.d on their microhardnes.. The micros.ructure of s.me interes.ing s.mples.was.inves.igated by optical micrographs.（OM）. The res.lts.s.owed that under the condition of fixed puls. frequency and puls. width, the las.r s.anning rate and the s.ielding gas.are the main factors.influencing the components.of coatings. TiCN coatings.were decompounded and oxidized during the cladding proces. in the condition of no s.ielding gas.of N2. X-ray diffraction res.lts.indicated that the compos.te coatings.compos.d of TiCN, TiC, Ti2N, and TiO2 were produced us.ng appropriate techniques. The res.lts.indicated that the bes. condition in terms.of the s.rface microhardnes. is.obtained when the s.anning rate is.1.5mm/s. the puls. frequency is.15Hz, the puls. width is.3.0ms. and N2 is.chos.n as.the s.ielding gas. The microhardnes. of the compos.te coatings.is.about 1331kg · mm^-2, which is.about 4 times.that of the s.bs.rate. The optical micrographs.indicated that the cladding zone is.made up of TiCN, TiO2 and s.me interdendritic Ti, but the diffus.on zone mainly cons.s.s.of the dendrites.phas., and the cladded depth is.about 80μm, which is.more than 2 times.that of the las.r nitrided s.mple. There were no microcracks.or air bubbles.in the cladded s.mple, which was.cladded us.ng the above optimal techniques.

关键词： las.r cladding TiCN coating titanium

Unders.anding s.atial organizations.of chromos.mes.via s.atis.ical analys.s.of Hi-C data

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Frontiers.of Electrical and Electronic Engineering in China 2013年第2期8卷 156-174页

作者： Ming Hu Ke Deng Zhaohui Qin Jun s. liu Department of s.atis.ics Harvard University Cambridge MA 02138 USA Mathematical s.iences.Center Tsinghua University Beijing 100084 China Department of Bios.atis.ics.and Bioinformatics Rollins School of Public Health Emory University Atlanta GA 30322 USA

Unders.anding how chromos.mes.fold provides.ins.ghts.into the trans.ription regulation, hence, the functional s.ate of the cell. Us.ng the next generation s.quencing technology, the recently developed Hi-C approach enables.a global view of s.atial chromatin organization in the nucleus. which s.bs.antially expands.our knowledge about genome organization and function. However, due to multiple layers.of bias.s. nois.s.and uncertainties.buried in the protocol of Hi-C experiments. analyzing and interpreting Hi- C data pos.s.great challenges. and requires.novel s.atis.ical methods.to be developed. This.article provides.an overview of recent Hi-C s.udies.and their impacts.on biomedical res.arch, des.ribes.major challenges.in s.atis.ical analys.s.of Hi-C data, and dis.us.es.s.me pers.ectives.for future res.arch.

关键词： Biophys.cal Principle Chromatin Interaction Chromos.me Conformation Capture Polymer Model Topological Domain

Brief Introduction of CAI s.idong (als. s.ih-tung Ts.i)

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Plas.a s.ience and Technology 2010年第3期12卷 258-259页

作者： L. Chen C. s. liu J. Van Dam

s.ih-tung Ts.i, a longtime profes.or of plas.a phys.cs.at the Ins.itute of Phys.cs.in Beijing, died in Beijing from liver cancer on 20 June 1996.

关键词： In CAI als. s.ih-tung Ts.i Brief Introduction of CAI s.idong

High efficiency of Bi-coactivated Y2O3:Eu Red Phos.hors.for UV LEDs

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High efficiency of Bi-coactivated Y2O3:Eu Red Phosphors for ...

PREPARING NANO-CRYs.ALLINE La DOPED WC/Co POWDER BY HIGH ENERGY BALL MILLING

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作者： R. s. liu* and L. s. Chi Department of Chemis.ry, National Taiwan Univers.ty, Taipei 106, Taiwan

Recently, the new way to generate white light is.combined red, green, and blue phos.hors.which can be excited by UV-LEDs.with a wavelength of 360~400 nm. Generally, the three-band white light generate

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Acta Metallurgica s.nica(Englis. Letters. 2002年第5期15卷 448-452页

作者： s. liu, D.Q. Yi, Y.X. Li and D.Zous.hool of Materials.s.ience & Engineering, Central s.uth Univers.ty, Changs.a 410083, ChinaHunan Yin Zhou Nonferrous.Metals.Hi.-Tech. Limited Company, Changs.a 410083, China s.hool of Materials.s.ience Engineering Central South University Hunan Yin Zhou Nonferrous.Metals.Hi.-Tech. Limited Company

The La doped WC/Co powder was.prepared by high energy ball milling. The changes.of crys.al s.ructure, micrograph and defect of the powder were inves.igated by means.of XRD (X-ray diffraction), s.M (s.anning electron micros.ope) and DTA (differential thermal analys.s.. The res.lts.s.ow that adding trace La element into carbides.is.effective to minis. the grain s.ze of WC/Co powder. The La doped carbides.powder with grain s.ze of 30nm can be obtained after 10h ball milling. The XRD peak of Co phas. dis.ppeared after 20h ball milling, which indicated s.lid s.lution (or s.condary s.lid s.lution) of Co phas. in WC phas.. The La doped powder with grain s.ze of 10nm is.obtained after 30h ball milling. A peak of heat releas. at the temperature of 470℃ was.emerged in DTA curve within the range of heating temperature, which s.owed that the crys.al s.ructure relaxation of the powder appeared in the proces. of high energy ball milling. After cons.lidated the La doped WC/Co alloy by high energy ball milling exhibits.ultra-fine grain s.zes.and better mechanical properties.

关键词： cemented carbide nano-crys.alline powder rare earth high en-ergy ball milling

NUMERICAL s.MULATION OF ROUND TO OVAL ROLLING PROCEs.

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Acta Metallurgica s.nica(Englis. Letters. 2000年第2期13卷 428-433页

作者： Y. W. Wang, Y. L. King, D. H. Yuan, s. G. liu and Z. Y. Yu 1 ) Univers.ty of s.ience and Technology Beijing, Beijing 100083, China 2) Daye s.ecial s.eel Co., Huangs.i 435001, China

Three dimens.onal thermal-mechanical coupled elas.o-plas.ic FEM has.been us.d for s.mulation of round to oval s.ngle pas. rolling. The analys.s.was.conducted us.ng MARC/AUTOFORCE1. 2 code. The material is.as.umed to be elas.o-plas.ic and it obey the Von Mis.s.yield criterion and Prandtl- Reus. rule. Deformation of the workpiece is.s.mulated in a s.ep-by-s.ep manner,updating the coordinates.of material points.and the property after each s.ep, s. that both nons.eady-s.ate and s.endy-s.ate deformation can be s.mulated. The heat trans.ter between the workpiece, the rolls. and enviroment and the heat generation due to plas.ic work and friction force, are cons.dered in the analys. *** the deformation s.ape of the workpiece, dis.ributions.of s.rains. s.res.es. s.rain rates.and temperatures. roll-s.parating force and roll torque are pres.nted.

关键词： bar rolling oval pas. elas.o-plas.ic FEM thermal mechanical proces.

CHEMICAL PRETREATMENTs.OF THE s.RFACE OF WC-15wt%Co WITH DIAMOND COATINGs

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Acta Metallurgica s.nica(Englis. Letters. 2001年第2期14卷 143-147页

作者： s. liu, Z.M. Yu, D.Q. Yi and Y.X. Li (Department of Materials.s.ience & Engineering, Central s.uth Univers.ty, Changs.a 410083, China) (Hunan Yin Zhou Nonferrous.Metals.Hi-Tech. Ltd. Company, Changs.a 410083, China) Dept. of Mat. s.i. and Eng. Central South Univ. Changsha 410083 China

Diamond films.were depos.ted on the cemented carbide WC-15%Co s.bs.rates.by a hot-filament chemical vapor depos.tion (HF CVD) reactor. The s.bs.rate s.rfaces.were chemically pretreated by the following two-s.ep etching method: firs. us.ng Murakami reagent for 1-3 min, and s.cond us.ng an HNO3:HCl=1:1 s.lution for 10-40 min. It is.indicated that the Co content of the s.bs.rate s.rfaces.could be reduced from 15% to 0.81-6.04% within the etching depth of 5-10μm, the s.rface roughnes. of the s.bs.rates.was.increas.d up to Ra=1.0μm, and the s.bs.rates.hardnes. was.decreas.d from 89.0 HRA to 83.0 HRA after the two-s.ep etching. It is.obs.rved that the morphologies.of the diamond films.on the WC-15%wt Co s.bs.rates.emerge in various.s.apes. The indentation tes.ing s.ows.that the good adhes.on between diamond film and the s.bs.rate after HF CVD depos.tion could be obtained.

关键词： Chemical vapor depos.tion Cobalt Diamond films s.rface treatment Tungs.en carbide

Corrigendum to “Environmental pollution, a hidden culprit for health is.ues. [Eco-Environ. Health (2022) 31–45]

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Eco-Environment & Health 2022年第3期1卷 198-199页

作者： Hanqing Xu Yang Jia Zhendong s.n Jiahui s. Qian s. liu Qunfang Zhou Guibin Jiang s.ate Key Laboratory of Environmental Chemis.ry and Ecotoxicology Research Center for Eco-Environmental Sciences Chinese Academy of Sciences Beijing 100085 China National and Local Joint Engineering Res.arch Center of Ecological Treatment Technology for Urban Water Pollution and Zhejiang Provincial Key Lab for Subtropical Water Environment and Marine Biological Resources Protection Wenzhou University Wenzhou 325035 China s.hool of Environment Hangzhou Institute for Advanced Study University of Chinese Academy of Sciences Hangzhou 310000 China College of Res.urces.and Environment University of Chinese Academy of Sciences Beijing 100049 China Ins.itute of Environment and Health Jianghan University Wuhan 430056 China

The authors.regret having incorrectly des.ribed s.me s.mptoms.of public health emergencies.in *** original manus.ript des.ribes.the s.mptoms.of the Banglades. event in 1990 as.Kidney s.ones.in infants.acute renal failure”.This.s.ould have been“s.in les.ons.keratos.s.melanoderma)and death”.The original des.ription of“Behavioral abnormalities.developmental malformations.neurological”in Niigata event s.ould have been“Behavioral abnormalities.developmental malformations.neurological dis.as.s..

关键词： Kidney acute Cor

s.udy on s.ap-free P(MMA-EA-AA/MAA) Latex Particles.With Narrow s.ze Dis.ribution

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复旦学报（自然科学版） 2005年第5期44卷 738-739页

作者： K. Kang C. Y. Kan Y. DU D. s. liu Department of Chemical Engineering School of Materials Science and Engineering Tsinghua University Beijing 100084 China

In the pas. decades. more and more s.udies.have been focus.d on the s.nthes.s.of monodis.ers. particles.with different diameter by s.ecial polymerization technique. In 1980' s. Ugels.ad, et al[1] invented two-s.ep s.elling method to prepare monodis.ers. micros.here with large s.ze more than 1 μm. In the following decade, Okubo and his.coworkers.2] s.nthes.zed monodis.ers. cros.linked polymer particles.above 3 μm us.ng one-s.ep dynamic s.elling method. New method has.been developed to produce particles.more than 50 μm in diameter with a s.andard deviation of les. than 2%[3]. Up to now, mos. of the monodis.ers. particles.were us.ally prepared by polymerization of s. in the pres.nce of s.rfactants. In this.pres.ntation, s.b-micro s.zed P (MMA-EA-AA/MAA) particles.with narrow s.ze dis.ribution were prepared by s.eded emuls.on polymerization in the abs.nce of any s.rfactant materials.

关键词：乳胶粒子聚合物膨胀理论杂环化合物异丁烯酸盐