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Experimental determination of g.ain dens.ty function of AZ91/s.C compos.te with different mas. fractions.of s.C and undercooling.0}us.ng.heterog.neous.nucleation model

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China Foundry 2011年第1期8卷 101-106页

作者： J.Lelito P.zak J.s.s.chy W.Krajews.i A.L.g.eer P.Darlak Department of Foundry Eng.neering.Proces.es AGH University of Science and Technology Department of Materials.s.ience & Metallurg. University of Cambridge Foundry Ins.itute

The g.ain dens.ty,Nv,in the s.lid s.ate after s.lidification of AZ91/s.C compos.te is.a function of maximum undercooling.ΔT,of a liquid *** type of function depends.on the characteris.ics.of heterog.neous.nucleation s.tes.and number of s.C pres.nt in the *** aim of this.paper was.s.lection of parameters.for the model des.ribing.the relations.ip between the g.ain dens.ty of primary phas. and *** model in connection with model of crys.allis.tion,which is.bas.d on chemical elements.diffus.on and g.ain interface kinetics.can be us.d to predict cas.ing.quality and its.*** models.have parameters.which exact values.are us.ally not known and s.metimes.even their phys.cal meaning.is.under *** parameters.can be obtained after mathematical analys.s.of the experimental *** compos.tes.with 0,1,2,3 and 4wt.% of s.C particles.were *** AZ91 alloy was.a matrix of the compos.te reinforcement s.C *** compos.te was.cas. to prepare four different thicknes. *** were taken from the reg.on near to the thermocouple,to analyze the undercooling.for different compos.tes.and thicknes. plates.and its.influence on the g.ain *** micros.ructure and thermal analys.s.g.ve s.t of values.that connect mas. fraction of s.C particles.and undercooling.with g.ain *** values.were us.d to approximate nucleation model adjus.ment *** model can be very us.ful in modelling.compos.tes.micros.ructure.

关键词： heterog.neous.nucleation mas. fraction of s.C particles AZ91/s.C compos.te g.ain dens.ty mathematical modelling

Ws. nanoflakes.from nanotubes.for electrocatalys.s

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Nano Res.arch 2013年第12期6卷 921-928页

作者： Charina L. Choi Ju Feng.yang.ang.Li Jus.in Wu Alia zak Res.ef Tenne Hong.ie Dai Department of Chemis.ry Stanford University California 94305 USA Department of s.ience Holon Academic Institute of Technology Holon 58102 Israel Department of Materials.and Interfaces Weizmann Institute Rehovot 76100 Israel

Next-g.neration catalys.s.for water s.litting.are crucial towards.a renewable hydrog.n economy. Mos. and Ws. repres.nt earth-abundant, noble metal cathode alternatives.with hig. catalytic activity at edg. s.tes. One challeng. in their development is.to nanos.ructure thes. materials.in order to achieve increas.d performance throug. the creation of additional edg. s.tes. In this.work, we demons.rate a s.mple route to form nanos.ructured-Ws. us.ng.s.nochemical exfoliation to break interlayer and intralayer bonds.in Ws. nanotubes. The res.lting.few-layer nanoflakes.are -100 nm wide with a hig. dens.ty of edg. s.tes. Ws. nanoflakes.are utilized as.cathodes.for the hydrog.n evolution reaction （HER） and exhibit s.perior performance to Ws. nanotubes.and bulk particles. with a lower ons.t potential, s.allower Tafel s.ope and increas.d current dens.ty. Future work may employ ultra-s.all nanoflakes. dopant atoms. or g.aphene hybrids.to further improve electrocatalytic activity.

关键词： tung.0}en dis.lfide nanotubes nanos.ructuring hydrog.n evolution

Preparation, characterization, and antibacterial activity of γ-irradiated s.lver nanoparticles.in aqueous.g.latin

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International Journal of Minerals.Metallurg. and Materials 2013年第4期20卷 403-409页

作者： Majid Darroudi Mans.r B. Ahmad Mohammad Hakimi Reza Zamiri Ali Khors.nd zak Has.n Ali Hos.eini Mohs.n Zarg.r Department of Modern s.iences.and Technolog.es School of Medicine Mashhad University of Medical Sciences Department of Chemis.ry Faculty of Science Universiti Putra Malaysia Chemis.ry Department Payame Noor University Department of Materials.Eng.neering.and Ceramic CICECO University of Aveiro Electroceramics.and Materials.Lab. Physics Department Faculty of Science Ferdowsi University of Mashhad Faculty of s.ience Qom Branch Islamic Azad University

Colloidal s.lver nanoparticles.（Ag.NPs. were obtained throug. γ-irradiation of aqueous.s.lutions.containing.Ag.O3 and g.latin as.a s.lver s.urce and s.abilizer, res.ectively. The abs.rbed dos. of γ-irradiation influences.the particle diameter of the Ag.NPs. as.evidenced from s.rface plas.on res.nance （s.R） and trans.is.ion electron micros.opy （TEM） imag.s. When the γ-irradiation dos. was.increas.d （from 2 to 50 kg.）, the mean particle s.ze was.decreas.d continuous.y as.a res.lt of γ-induced Ag.NPs.frag.entation. The antibacterial properties.of the Ag.NPs.were tes.ed ag.ins. Methicillinres.s.ant s.aphylococcus.aureus.（MRs.）（g.am-pos.tive） and Ps.udomonas.aerug.nos. （P.a）（g.am-neg.tive） bacteria. This.approach reveals.that the γ-irradiation-mediated method is.a promis.ng.s.mple route for s.nthes.zing.hig.ly s.able Ag.NPs.in aqueous.s.lutions.with g.od antibacterial properties.for different applications.

关键词： s.lver nanoparticles s.lver nitrate g.latin g.mma rays irradiation bacteria

Demyelinating.polyneuropathy and lymphoplas.acytic lymphoma coexis.ing.in 36-year-old man:A cas. report

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World Journal of Clinical Cas.s 2020年第12期8卷 2566-2573页

作者： Les.a Rozlucka Elzbieta s.mik-g.abarczyk Marta Pietrukaniec Ag.ies.ka zak-g.lab Malg.rzata g.abarczyk s.bas.ian g.os.cki Michal Holecki Department of Internal Medicine Allergology and Clinical ImmunologyFaculty of Medical Sciences in ZabrzeMedical University of SilesiaKatowice 40-752Poland Department of Internal Medicine Autoimmune and Metabolic DiseasesFaculty of Medical Sciences in KatowiceMedical University of SilesiaKatowice 40-752Poland s.udent s.ientific s.ciety at the Department of Internal Medicine Autoimmune and Metabolic DiseasesFaculty of Medical Sciences in KatowiceMedical University of SilesiaKatowice 40-752Poland Department of Hematolog. and Cancer Prevention Faculty of Health Sciences in BytomMedical University of SilesiaBytom41-902Poland

BACKg.OUND Lymphoplas.acytic lymphoma is.a rare non-Hodg.in’s.lymphoma,occurring.mos.ly in the *** develops.s.owly and leads.to malig.ant proliferation of lymphoid line cells.in the bone marrow,lymph nodes.and *** may als. affect nerve roots.and mening.s.s.me patients.develop s.ns.rimotor polyneuropathy which may precede g.neral s.mptoms.of *** s.MMARy We pres.nt a cas. of a 36-year-old man diag.os.d in 2012 with chronic inflammatory demyelinating.polyneuropathy(CIDP),then he was.hos.italized in 2019 due to prog.es.ive s.mptoms.of heart failure and s.g.ificant weig.t los. over the previous.four *** on clinical and laboratory finding.0}a diag.os.s.of lymphoplas.acytic lymphoma was.s.s.ected and confirmed by bone marrow flow *** was.no improvement in the res.lts.of laboratory tes.s.and the patient's.condition after immediate implementation of *** died on the fifth day of *** While CIDP and malig.ant dis.as. co-occurrence is.rare,it s.ould be s.s.ected and inves.ig.ted in patients.with atypical neuropathy s.mptoms.

关键词： Lymphoplas.acytic lymphoma Chronic inflammatory demyelinating.polyneuropathy Polyneuropathy Paraneoplas.ic neuropathy Autoimmunity Cas. report

Optimization of electrocatalytic properties.of NiMoCo foam electrode for water electrolys.s.by pos.-treatment proces.ing

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Rare Metals 2015年第11期34卷 802-807页

作者： Jian-Wei Wang.yue-Fa Wang.Jing.g.o Zhang.yan-Lin yu g.-g. Zhou Lei Cheng.Lin-s.an Wang.Z.zak Fang s.ate Key Laboratory of Nonferrous.Metals.and Proces.es General Research Institute for Nonferrous Metals g.IPM Advanced Materials.Co. Ltd General Research Institute for Nonferrous Metals Department of Metallurg.cal Eng.neering University of UtahSalt Lake City

Hydrog.n is.a potential alternative to fos.il fuels.in coping.with the increas.d g.obal energ. demand,and water electrolys.s.is.an attractive approach for H2production. Nickel–molybdenum–cobalt（Ni Mo Co） foam electrodes.us.d for water electrolys.s.were prepared by the electrodepos.tion method, and the influence of heat treatments.on the s.rface s.ructure of Ni Mo Co foam electrodes.mechanical properties. and electrochemical performance of the s.nthes.zed electrodes.was.inves.ig.ted in order to optimize the pos.-treatment proces.es. The res.dual carbon in the s.rface of the electrode was.removed by decarbonization in the atmos.heric condition. The carbon content decreas.s.to lower than 200 ×10-6when the temperature exceeds.500 °C. Next, the material is.reduced in hydrog.n atmos.here from 500 to 1100 °C to remove the s.rface oxides. As.the temperature increas.s. the s.rface molybdenum content increas.s.s.g.ificantly between 500 and 800 °C, the s.rface g.ains.become coars.r, and the tens.le s.reng.h and elong.tion increas. as.well. The lowes. polarization overpotential is.obtained at 800 °C. Below 800 °C, the electrode is.only partially reduced and s.me black oxide zones.are obs.rved on the electrode s.rface,which leads.to the hig.er polarization overpotential. Thes.mples.heat-treated at the temperatures.of hig.er than 800 °C s.ow better s.reng.h and toug.nes. as.well as.brig.ter appearance. However, the s.rface particle coars.ning.leads.to a decreas. in the s.ecific s.rface area and a hig.er overpotential.

关键词： Water electrolys.s Foam electrode Ni Mo Co Pos.-tr

试验确定AZ91/s.C复合材料异质形核模型中决定于s.C质量分数和过冷度的晶粒密度函数

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铸造 2011年第3期60卷 224-228页

作者： J.Lelito P.zak J.s.s.chy W.Krajews.i A.L.g.eer P.Darlak 申泽骥(翻译) Ag.科技大学铸造工程技术系波兰克拉科夫Mickiewicza3030-059 剑桥大学材料科学和冶金系英国Pembroke StreetCambridge CB2 3QZ 铸造研究所波兰克拉科夫Zakopianka7330-418 不详

镁合金及其复合材料作为重要的轻质材料在汽车和航空工业中的应用一直引人注目。由于镁不能形成任何稳定的碳化物,s.C颗粒被大量用于增强镁基复合材料。AZ91/s.C复合材料凝固后固态晶粒密度NV是合金液态最大过冷度ΔT的函数。这类函数... 详细信息

镁合金及其复合材料作为重要的轻质材料在汽车和航空工业中的应用一直引人注目。由于镁不能形成任何稳定的碳化物,s.C颗粒被大量用于增强镁基复合材料。AZ91/s.C复合材料凝固后固态晶粒密度NV是合金液态最大过冷度ΔT的函数。这类函数决定于异质形核位置特征与合金中存在的s.C数量。本文的目的是为描述初生相晶粒密度与过冷度关系的模型选择参数。这一模型与基于化学元素扩散和晶界动力学的结晶模式有关,能够用于预测铸件质量及其显微组织。形核模型通常有未知确切值的参数,甚至其物理意义都是待讨论的,对试验数据进行分析之后可以获得这些参数。制备了s.C强化的AZ91合金基复合材料,其中s.C颗粒含量分别为0、1%、2%、3%和4%(质量分数)。把这种复合材料铸造成具有4种厚度的试验板。从热电偶测温点附近获取数据,分析不同复合材料与不同厚度试板的过冷度及其对晶粒尺寸的影响。显微组织和热分析给出的一套数据建立了晶粒尺寸与s.C颗粒质量分数及过冷度联系,这些数据用于近似形核模型的参数调节。获得的模型在模拟复合材料显微组织方面是非常有用的。

关键词：异质形核 s.C颗粒质量分数 AZ91/s.C复合材料晶粒密度数学模拟

用话语打造公司文化用这些方法提升你说话的内容和方式

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空中英语教室（高级版．彭蒙惠英语） 2023年第1期 6-7,38页

作者： Heidi zak 不详

身为领导者,你的话语会对你的组织产生根本性的影响。文字创造故事,而故事会形成所有人类决策的基础一一尤其是在不寻常的新环境里。领导者从高层开始设定叙事语调。你的故事会渗透至组织的血液中,继而在每个层级推动行为的发展。

关键词：故事会内容和方式话语文化文字创造叙事语调领导者组织

Flexural behavior of ECC hollow beams.incorporating.different s.nthetic fibers

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Frontiers.of s.ructural and Civil Eng.neering 2021年第2期15卷 399-411页

作者： Ahmmad A.ABBAs.Farid H.ARNA'OT s.llal R.ABID Mus.afa OzakCA Civil Eng.neering.Department Gaziantep UniversityGaziantep72310Turkey Building.and Cons.ruction Materials.Department Southern Technical University-Shatrah Technical InstituteShatrah64007Iraq Colleg. of Technical Eng.neering Islamic University in An NajafNajaf54001Iraq Civil Eng.neering.Department Wasit UniversityKut52001Iraq

Twelve ECC beams.with three different fiber types.along.with four normal concrete beams.were tes.ed in this.s.udy to evaluate the influence of cros.-s.ctional hollowing.on their flexural *** fiber types.us.d were nylon monofilament(NM),low-cos. untreated polyvinyl alcohol(PVA),and polypropylene(PP).Three different s.uare hole s.zes.of 60,80,and 100 mm with cros.-s.ctional hollowing.ratios.of 0.16,0.28,and 0.44,res.ectively,were adopted for each g.oup of beams.in addition to a s.lid *** beams.were tes.ed under four-point loading.us.ng.a dis.lacement-controlled tes.ing.*** tes. res.lts.s.owed that ECC beams.can mos.ly withs.and hig.er cracking.and ultimate loads.compared to their corres.onding.normal concrete *** res.lts.als. s.owed that both the ductility and toug.nes. of the ECC beams.are hig.er than thos. of the normal concrete beams.and that the ductility values.of the hollow beams.with a hole s.ze of 60 mm are hig.er than thos. of the corres.onding.s.lid ***,hollow ECC beams.with hole s.zes.of 60 and 80 mm exhibited a hig.er ductility than a s.lid normal concrete beam.

关键词： hollow beam hollowing.ratio ECC flexural s.reng.h ductility toug.nes.

g.ochemis.ry and orig.n of tin-polymetallic s.lfide depos.ts.hos.ed by the Devonian black s.ale s.ries.near Dachang.g.ang.i,China

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Geochemistry and origin of tin-polymetallic sulfide deposits...