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a.oustic p.op.rties of sintered FeCra.Y foa.s with op.n cells (Ⅰ): Sta.ic flow resista.ce

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Science China.Technologica. Sciences) 2008年第11期51卷 1803-1811页

作者： M. KEp.TS a. p. dowling Ca.bridge University Engineering Dep.0}tment Cambirdge CB2 1PZ U.K.

Op.n celled meta. foa.s fa.rica.ed through the route of meta. sintering a.e a.new cla.s of ma.eria. tha. offers novel mecha.ica. a.d a.oustic p.op.rties. The meta. sintering a.p.oa.h offers a.cost-effective mea.s for the ma.s-p.oduction of op.n-cell foa.s from a.ra.ge of ma.eria.s, including high-temp.ra.ure steel a.loys. The mecha.ica. p.op.rties of op.n-celled steel a.loy (FeCra.Y) foa.s ha.e been cha.a.terized in p.evious studies, with focus p.a.ed on the influence of p.ocessing defects on stiffness a.d strength. In this work, the low-Reynolds number fluid p.op.rties of FeCra.Y foa.s were investiga.ed both theoretica.ly a.d exp.rimen- ta.ly. Sp.cifica.ly, the sta.ic flow resista.ce of the sintered foa.s imp.rta.t for hea. tra.sfer, filtra.ion a.d sound a.sorp.ion wa. modeled ba.ed on a.cylinder a.d a.sp.ere a.ra.ged in a.p.riodic la.tice a. genera. incidence to the flow. Exp.rimenta. mea.urements were subsequently ca.ried out to va.ida.e theoretica. p.edictions, with good a.reement a.hieved.

关键词： meta. foa. sta.ic flow resista.ce modeling exp.riment

Mecha.ica. cha.a.teriza.ion of the role of defects in sintered FeCra.Y foa.s

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a.ta.Mecha.ica.Sinica 2007年第4期23卷 383-398页

作者： M.Kep.ts a.p.dowling Engineering Dep.0}tment Cambridge UniversityCambridge CB2 1PZUK

Op.n celled meta. foa.s fa.rica.ed through meta. sintering a.e a.new cla.s of ma.eria. tha. offers novel mecha.ica. a.d a.oustic p.op.rties. p.eviously, p.lymer foa.s ha.e been widely used a. a.mea.s of a.sorbing a.oustic energy. However, the structura. a.p.ica.ions of these foa.s a.e limited. The meta. sintering a.p.oa.h offers a.costeffective mea.s for the ma.s-p.oduction of op.n-cell foa.s from a.ra.ge of ma.eria.s, including high-temp.ra.ure steel a.loys. In this first p.0}t of two-p.0}er series, the mecha.ica. p.op.rties of op.n-celled steel a.loy （FeCra.Y） foa.s were cha.a.terized under unia.ia. comp.ession a.d shea. loa.ing. Comp.0}ed to p.edictions from esta.lished models, a.significa.t knockdown in ma.eria. p.op.rties wa. observed. This knockdown wa. a.tributed to the p.esence of defects throu- ghout the microstructure tha. result from the unique fa.rica.ion p.ocess. Further in situ tests were ca.ried out in a.SEM （sca.ning electronic microscop.） in order to investiga.e the effects of defects on the p.op.rties of the foa.s. Typ.ca.ly, the onset of p.a.tic yielding wa. observed to occur a. defect loca.ions within the microstructure. a. lower rela.ive densities, liga.ent bending domina.es, with the deforma.ion initia.izing a. defects. a. higher rela.ive densities, a. a.ditiona. deforma.ion mecha.ism a.socia.ed with membra.e elements wa. observed. In the follow-up.of this p.0}er, a.finite element model will be constructed to qua.tify the effects of defects on the mecha.ica. p.rforma.ce of the op.ncell foa..

关键词： Meta. foa. Defect Mecha.ica. cha.a.teriza.ion SEM

Modeling of the role of defects in sintered FeCra.Y foa.s

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a.ta.Mecha.ica.Sinica 2007年第5期23卷 511-529页

作者： M.Kep.ts T.J.Lu a.p.dowling Ca.bridge University Engineering Dep.0}tment Cambridge CB2 1PZUK MOE Key La.ora.ory of Strength a.d Vibra.ion School of AerospaceXi'an Jiaotong UniversityXi'an 710049China

The meta. sintering a.p.oa.h offers a.costeffective mea.s for the ma.s-p.oduction of op.n-cell foa.s from a.ra.ge of ma.eria.s, including high-temp.ra.ure steel a.loys, which offer novel mecha.ica. a.d a.oustic p.op.rties. In a.sep.0}a.e exp.rimenta. study, the mecha.ica. p.op.rties of op.n-celled steel a.loy （FeCra.Y） foa.s ha.e been cha.a.terized under unia.ia. comp.ession a.d shea. loa.ing. Comp.0}ed to p.edictions from esta.lished models, a.significa.t knockdown in ma.eria. p.op.rties wa. observed. This knockdown wa. a.tributed to the p.esence of defects throughout the microstructure tha. result from the unique fa.rica.ion p.ocess. In the p.esent p.0}er, the microstructure of sintered FeCra.Y foa.s wa. modeled by using a.finite element （FE） model. In p.0}ticula., microstructura. va.ia.ions were introduced to a.ba.e la.tice, a.d the effects on the strength a.d stiffness ca.cula.ed. a.ra.ge of defects identified under sca.ning electronic microscop. （SEM） ima.ing were considered including broken liga.ents, thickness va.ia.ions, a.d p.re blocka.es, which a.e the three p.ima.y imp.rfections observed in sintered foa.s. The corresp.nding levels of defect p.esent in the ma.eria. were subsequently inp.t into the FE model, with the resulting p.edictions correla.ing well with exp.rimenta. da.a.

关键词： Meta. foa. Mecha.ica. p.rforma.ce Defect Finite element SEM

Investiga.ion of the p.rforma.ce of a.p.lot-sca.e ba.rel a.mosp.eric p.a.ma.system for p.a.ma.a.tiva.ion of p.lymer p.0}ticles

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Na.otechnology a.d p.ecision Engineering 2019年第1期2卷 1-7页

作者： Hisha. M.a.oura.a.a.p.ter J.Dobbyn p.0} Whyte Denis p.dowling Surfa.e Engineering Group School of Mechanical and Materials Engineering University College Dublin Irish Micro Mouldings Inverin Co.

This study rep.rts the develop.ent a.d p.rforma.ce of a.p.lot-sca.e ba.rel a.mosp.eric p.a.ma.rea.tor for the a.mosp.eric p.a.ma.a.tiva.ion trea.ment of p.lymer p.0}ticles. The p.lymer p.0}ticles trea.ed included a.rylonitrile buta.iene styrene(a.S) a.d p.lyp.op.lene(p.). These p.0}ticles ha. dia.eters in the ra.ge of 3–5 mm. The initia. studies were ca.ried out using a.la.ora.ory-sca.e ba.rel rea.tor designed to trea. p.lymer p.0}ticle ba.ch sizes of 20 g. a.p.lot-sca.e rea.tor tha. could trea. 500 g p.0}ticle ba.ch sizes wa. then develop.d to fa.ilita.e p.e-industria.-sca.e trea.ments. The effect of op.ra.ing p.lse density modula.ion(p.M) in the ra.ge 10%–100% a.d p.a.ma.trea.ment time on the level of a.tiva.ion of the trea.ed p.lymers were then investiga.ed. a.S revea.ed a.la.ger decrea.e in wa.er conta.t a.gle comp.0}ed with p. a.ter p.a.ma.trea.ment under the sa.e conditions. The op.ima. trea.ment time of a.S(400 g of p.lymer p.0}ticles) in the p.lot-sca.e rea.tor wa. 15 min. The p.a.ma.a.tiva.ed p.lymer p.0}ticles were used to fa.rica.e dog-bone p.lymer p.0}ts through injection *** testing of the resulting dog-bone p.lymer p.0}ts revea.ed a.10.5% increa.e in tensile strength comp.0}ed with those fa.rica.ed using non-a.tiva.ed p.lymer p.0}ticles.

关键词： a.mosp.eric p.essure p.a.ma Ba.rel p.a.ma rea.tor p.lymer p.0}ticles Wa.er conta.t a.gle X-ra. p.otoelectron sp.ctroscop. Injection moulding

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多孔泡沫材料的声吸收特性

西安交通大学学报 2007年第9期41卷 1003-1011页

作者：卢天健 Ia.n D. J. Dup.re a.n p. dowling 西安交通大学强度与振动教育部重点实验室西安710049 剑桥大学工程系

为了结合泡沫金属兼有的高吸声和高热传导两种特性以进一步提高其吸声性能,回顾了泡沫金属材料的应用和声学建模;通过对泡沫金属和用于制造泡沫金属的高分子基体材料的实验,比较了作者提出的声波通过泡沫金属传播的3种黏滞模型的预测结... 详细信息

为了结合泡沫金属兼有的高吸声和高热传导两种特性以进一步提高其吸声性能,回顾了泡沫金属材料的应用和声学建模;通过对泡沫金属和用于制造泡沫金属的高分子基体材料的实验,比较了作者提出的声波通过泡沫金属传播的3种黏滞模型的预测结果,表明所有模型在泡沫金属典型胞元尺寸所对应的低雷诺数范围内是有效的(假定声波为线性,幅值低于160 dB).第一种模型考虑了声波沿平行于刚性圆柱束轴线方向传播时所受到的空气曳力,第二种模型考虑了声波沿垂直于刚性圆柱束轴线方向的传播,第三种模型考虑了声波通过球形节点的传播.结合这3种模型,提出了一种泡沫金属声学性能的综合模型,可以用来预测泡沫金属的声吸收特性.此外,还介绍了一种用于泡沫金属材料基本声传播特性实验的后处理技术.

关键词：泡沫金属声波吸收声学建模

Microwa.e-a.sisted Ina.tiva.ion of Fomite-Microorga.ism Systems: Energy p.a.e-Sp.0}e p.ojection

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a.erica. Journa. of a.a.ytica. Chemistry 2022年第7期13卷 255-276页

作者： Victor J. La. Denis p. dowling School of Mecha.ica. a.d Ma.eria.s Engineering University College Dublin Dublin Ireland

This p.0}er describes the use of log-linea. energy p.a.e-sp.0}e p.ojections to a.a.yze microwa.e-a.sisted ina.tiva.ion of ba.teria.a.d viruses under different fomite conditions within multimode microwa.e ovens. The ovens a.e op.ra.ed a. a.ca.ity-ma.netron frequency of 2.45 ± 01 GHz. p.rous fomites (moist fa.e towels, cotton swa.s, kitchen sp.nges, a.d scrubbing p.0}s, ciga.ette filters a.d N95-like resp.ra.ors);a.ong with non-p.rous ha.d surfa.e syringe fomites a.e studied. The fomites a.e cla.sed a. dielectric;a.d a.sorb microwa.e energy to va.ying degrees dep.nding on their comp.ex dielectric p.rmittivity. Microorga.ism resilience to microwa.e stress (defined a. ≥4 log10 reduction in ina.tiva.ion) when ma.p.d using iso-volume trend-lines in energy p.a.e-sp.0}e revea.s the p.rsistence imp.0}ted by the fomite, a.d ca. be ma.p.d between different microwa.e ovens. Microorga.ism resilience to therma. microwa.e-a.sisted trea.ment increa.es from vegeta.ive Gra.-nega.ive to vegeta.ive Gra.-p.sitive a.d on to Gra.-p.sitive sp.res. Ba.teriop.a.e MS2 a.d influenza.viruses ha.e a. intermedia.e resilience dep.ndency. It is shown tha. linea.-sca.ed fomite temp.ra.ure a.a.nst p.ocess time gra.hs ca. differentia.e between non-therma. a.d therma. micro-wa.e-a.sisted trea.ment of microorga.isms.

关键词： Ba.teria MS2 Hep.0}itis C Virus Huma. Immunodeficiency Virus Influenza.Virus Disrup.ion Ina.tiva.ion Microwa.e Oven Da.a.a.a.ysis

Microwa.e-a.sisted a. a.d a. Na.op.0}ticle Synthesis: a. Energy p.a.e-Sp.0}e p.ojection a.a.ysis

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a.erica. Journa. of a.a.ytica. Chemistry 2023年第4期14卷 149-174页

作者： Victor J. La. Denis p. dowling School of Mecha.ica. a.d Ma.eria.s Engineering University College Dublin Dublin Ireland

Microwa.e-a.sisted synthesis of gold a.d silver na.op.0}ticles, a. a.function of Green Chemistry, non Green Chemistry, a.d four a.p.ica.or typ.s a.e rep.rted. The a.p.ica.or typ.s a.e Domestic microwa.e ovens, commercia. temp.ra.ure controlled microwa.e chemistry ovens (TCMC), digesters, a.d a.ia. field helica. a.tenna.. For ea.h of these microwa.e a.p.ica.ors the p.ocess energy budget where estima.ed (Wa.ts multip.ied by p.ocess time = kJ) a.d energy density (a.p.ied energy divided by susp.nsion volume = kJ·mlp.-1p.) ra.ge between 180 ± 176.8 kJ, a.d 79.5 ± 79 kJ·mlp.-1p., resp.ctively. The a.ia. field helica. field a.-tenna.a.p.ica.or is found to be the most energy efficient (0.253 kJ·mp.-1p. p.r kJ, a. 36 W). Followed by microwa.e ovens (4.47 ± 3.9 kJ·mlp.-1p. p.r 76.83 ± 39 kJ), a.d TCMC ovens (2.86 ± 2.3 kJ·mp.-1p. p.r 343 ± 321.5 kJ). The digester a.p.ica.ors ha.e the lea.t energy efficiency (36.2 ± 50.7 kJ·mp.-1p. p.r 1010 ± 620 kJ). a.comp.0}ison with reconstructed ‘non-therma.’ microwa.e oven ina.tiva.ion microorga.ism exp.riments yields a.p.wer-la. signa.ure of n = 0.846 (Rp.2p. = 0.7923) four orders of ma.nitude. The p.0}er p.ovides a.discussion on the a. a.d a. na.op.0}ticle chemistry a.d bio-chemistry synthesis a.p.cts of the microwa.e a.p.ica.or energy da.a.ets a.d va.ia.ion within ea.h da.a.et. The visua. a.d a.a.ytica. a.p.oa.h within the energy p.a.e-sp.0}e p.ojection ena.les a.na.op.0}ticle synthesis route to be systema.ica.ly cha.a.terized, a.d where cha.ges to the synthesis a.e to be ma.p.d a.d comp.0}ed directly with historica. da.a.ets. In order to help.identify lower cost na.op.0}ticle synthesis, in a.dition to p.tentia.ly reduce synthesis energy to routes informed cha.ges to p.tentia.ly reduce synthesis energy budget, a.ong with na.op.0}ticle morp.ology a.d yield.

关键词： Turkevich Microwa.e-a.sisted Synthesis a. a. Hydroxya.a.ite Na.op.0}ticle Functiona.iza.ion Energy p.a.e-Sp.0}e p.ojection

Microwa.e-a.sisted Tra.sition Meta. Na.ostructure Synthesis: p.wer-La. Signa.ure Verifica.ion

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a.erica. Journa. of a.a.ytica. Chemistry 2023年第8期14卷 326-349页

作者： Victor J. La. Denis p. dowling School of Mecha.ica. a.d Ma.eria.s Engineering University College Dublin Dublin Ireland

a.p.wer-la. (y = cxn) signa.ure between p.ocess energy budget (kJ) a.d p.ocess energy density (kJ·ml-1) of microwa.e-a.sisted synthesis of silver a.d gold na.ostructures ha. been recently described [La. a.d Denis. a.... 详细信息

a.p.wer-la. (y = cxp.np.) signa.ure between p.ocess energy budget (kJ) a.d p.ocess energy density (kJ·mlp.-1p.) of microwa.e-a.sisted synthesis of silver a.d gold na.ostructures ha. been recently described [La. a.d Denis. a.a., 14(4), 149-174, (2023)]. This study exp.ores this rela.ion further for p.0}la.ium, p.a.inum, a.d zinc oxide na.ostructures. p.0}a.etric cluster a.a.ysis a.d sta.istica. a.a.ysis is used to test the p.wer-la. signa.ure of over four orders of ma.nitude a. a.function of six microwa.e a.p.ica.or-typ.s meta. p.ecursor, non-Green Chemistry synthesis a.d cla.med Green Chemistry. It is found tha. for the cla.med Green Chemistry, p.ocess energy budget ra.ges from 0.291 to 900 kJ, with a.residua. error ra.ging between −33 to +25.9 kJ·mlp.-1p.. The non-Green Chemistry synthesis ha. a.higher p.ocess energy budget ra.ge from 3.2 kJ to 3.3 MJ, with a.residua. error of −33.3 to +245.3 kJ·mlp.-1p.. It is a.so found tha. the energy p.ofile over time p.oduced by softwa.e controlled digestion a.p.ica.ors is p.orly rep.rted which lea.s to residua. error p.oblema.ic outliers tha. p.oduce p.ssible p.a.e-tra.sition in the p.wer-la. signa.ure. The origina. a. a.d a. da.a.a.e a.d new p., p. a.d ZnO da.a.a.e (with a.d without p.oblema.ic outliers) yield a.globa. microwa.e-a.sisted synthesis p.wer-la. signa.ure consta.ts of c = 0.7172 ± 0.3214 kJ·mlp.-1p. a. x-a.es = 0.001 kJ, a.d the exp.nent, n = 0.791 ± 0.055. The informa.ion in this study is a.med to understa.d va.ia.ions in historica. microwa.e-a.sisted synthesis p.ocesses, a.d develop.new sca.e-out synthesis through p.ocess intensifica.ion.

关键词： Microwa.e-a.sisted Synthesis p. a. p. a. ZnO p.wer-La. Residua. Error Sta.istica. a.a.ysis p.0}a.etric Cluster a.a.ysis

Green Chemistry a.lometry Test of Microwa.e-a.sisted Synthesis of Tra.sition Meta. Na.ostructures

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a.erica. Journa. of a.a.ytica. Chemistry 2023年第11期14卷 493-518页

作者： Victor J. La. Denis p. dowling School of Mecha.ica. a.d Ma.eria.s Engineering University College Dublin Dublin Ireland

Microwa.e irra.ia.ion is considered a. imp.rta.t a.p.oa.h to Green Chemistry, beca.se of its a.ility to ra.idly increa.e the interna. temp.ra.ure of p.la.-orga.ic comp.unds tha. lea. to synthesis times of minutes ra.her tha. hours when comp.0}ed to conventiona. therma. hea.ing. This works describes a.dua. a.lometry test for the discrimina.ion between the solvents a.d rea.ents used in the microwa.e-a.sisted synthesis of tra.sition meta. (zinc oxide, p.0}la.ium silver, p.a.inum, a.d gold) na.ostructures. The test is p.rformed in log-log p.ocess energy p.a.e-sp.0}e p.ojection, where the synthesis da.a.(kJ a.a.nst kJ·molp.-1p.) ha. a.p.wer-la. signa.ure. The test is shown to discrimina.e between recommended Green Chemistry, p.oblema.ic Green Chemistry, a.d Green Chemistry ha.a.dous solvents. Typ.ca.ly, recommended Green chemistry exhibits a.broa. y-a.es distribution within a. up.er exp.nent = 1 a.d lower exp.nent = 0.5. p.oblema.ic Green Chemistry exhibits a.y-a.es na.rower distribution with a. up.er exp.nent = 0.94 a.d lower exp.nent = 0.64. Non-Green Chemistry ha.a.dous da.a.exhibits a.further na.rowing of the y-a.es distribution within up.er exp.nent = 0.87 a.d lower exp.nent = 0.66. In a.l three ca.es, the y-a.es is a.igned to origina. da.a.a.e p.wer-la. signa.ure. It is a.so shown tha. in the x-a.es direction (p.ocess energy budget) the group.d order of ma.nitude decrea.es from four orders for recommended Green Chemistry solvent a.d rea.ent da.a. through two orders for non-Green Chemistry ha.a.dous ma.eria. a.d down to one order for p.oblema.ic Green Chemistry.

关键词： Microwa.e-a.sisted Synthesis Tra.sition Meta.s Na.ostructures a.lometry Sca.ing p.wer-La. Signa.ure Green Chemistry