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Influence of the Therma. Ba.rier Coa.ings Design on the Oxida.ion Beha.ior

Journa. of Ma.eria.s Science & Technology 2009年第4期25卷 499-507页

作者： B. Sa.edi a. Sa.our a. Eba.i a.M. Khodda.i Ma.eria.s Engineering Depa.tment a. Ta.bia. Moda.es University Ma.eria.s Engineering Fa.ulty Tehran University

The properties of two different types of therma. ba.rier coa.ings （TBCs） were compa.ed to improve the surfa.e cha.a.teristics on high tempera.ure components. These TBCs consisted of a.duplex TBC a.d a.five-la.ered functiona.ly gra.ed TBC. NiCra.Y bond coa.s were deposited on a.number of Inconel-738LC specimens using high velocity oxy-fuel spra.ing （HVOF） technique. For duplex coa.ing, a.group of these specimens were coa.ed with yttria.sta.ilized zirconia.（YSZ） using pla.ma.spra. technique. Functiona.ly gra.ed NiCra.Y/YSZ coa.ings were fa.rica.ed by pla.ma.spra. using co-injection of the two different powders in a.single pla.ma.torch. The a.ount of zirconia.in functiona.ly gra.ed coa.ings were gra.ua.ly increa.ed from 30 to 100 vol. pct. Microstructura. cha.ges, therma.ly grown oxide （TGO） la.er growth a.d da.a.e initia.ion of the coa.ings were investiga.ed a. a.function of isotherma. oxida.ion test a. 970℃. a. a.complementa.y test, the performa.ce of the fa.rica.ed coa.ings by the optimum processing conditions wa. eva.ua.ed a. a.function of intense therma. cycling test a. 1100℃. a.so the strength of the a.hesive coa.ings of the substra.e wa. a.so mea.ured. Microstructura. cha.a.teriza.ion wa. a.a.yzed by sca.ning electron microscopy （SEM） a.d optica. microscopy wherea. pha.e a.a.ysis a.d chemica. composition cha.ges of the coa.ings a.d oxides formed during the tests were studied by XRD （X-ra. diffra.tion） a.d EDS （energy dispersive spectrometer）. The results showed tha. microstructure a.d compositions gra.ua.ly va.ied in the functiona.ly gra.ed coa.ings. By compa.ison of duplex a.d functiona.ly gra.ed TBCs oxida.ion beha.ior （duplex fa.lure a.ter 1700 h a.d funcitiona.ly gra.ed TECs fa.lure a.ter 2000 h）, therma. shock test a.d a.hesion strength of the coa.ings, the functiona.ly gra.ed TBC ha. better performa.ce a.d more dura.ility.

关键词： Therma. ba.rier coa.ings (TBCs) Isotherma. oxida.ion Functiona.ly gra.ed TBC Therma.ly grown oxide Bond strength High velocity oxy-fuel spra.ing

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Novel method for the prepa.a.ion of Cs-conta.ning Fa.（Y） ca.a.ysts for a.iline methyla.ion

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Frontiers of Chemica. Science a.d Engineering 2018年第1期12卷 70-76页

作者： Olga.a. Ponoma.eva.Polina.a. Sha.oshnik Ma.ina.Vo Belova.Boris a. Kolozhva.i Irina.I. Iva.ova Depa.tment of Chemistry Lomonosov Moscow State University Moscow 119991 Russia a.V. Topchiev Institute of Petrochemica. Synthesis Moscow Russia

Cs-conta.ning Fa.（Y）-type zeolite ca.a.ysts were prepa.ed by conventiona. a.d novel ion excha.ge procedures followed by incipient wetness impregna.ion with CsOH. The novel ion excha.ge procedure involved hydrotherma. trea.ment of Na. zeolite in a.ueous solution of CsCl a. 140-200 ℃ for 6-24 h. The sa.ples were cha.a.terized by low-tempera.ure nitrogen a.sorption, X-ra. fluorescence a.a.ysis, X-ra. powder diffra.tion, sca.ning electron microscopy, 23Na. 27a. a.d 133Cs ma.ic a.gle spinning nuclea. ma.netic resona.ce, CO2 a.d NH3-Tempera.ure progra.med desorption. The results show tha. hydrotherma. trea.ment a. 200 ℃ a.lows to obta.n higher degrees of ion-excha.ge （up to 83%） with respect to conventiona. method giving ma.imum 66%- 69%. Ca.a.ytic properties of Cs-conta.ning Fa.（Y） were studied in a.iline methyla.ion. The yield of Nomethyla.i- line is shown to correla.e with ca.a.yst＇s ba.icity. The best ca.a.yst performa.ce wa. a.hieved over the ca.a.yst with the highest ion-excha.ge degree impregna.ed with CsOH. The selectivity to N-methyla.iline over this ca.a.yst rea.hed 96.4%.

关键词： Fa.(Y) zeolite ion excha.ge with cesium a.iline a.kyla.ion N-methyla.iline

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a.plying the Different Sta.istica. Tests in a.a.ysis of Electrica. Brea.down Mecha.isms in Nitrogen Filled Ga. Diode

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Pla.ma.Science a.d Technology 2016年第10期18卷 978-986页

作者： Cedomir a. Ma.UCKOV Sa.a.a. Ra.CEV Miodra. K. Ra.OVIC Technica. Fa.ulty in Bor University of Belgrade Vojske Jugoslavije 12 19210 Bor Serbia Fa.ulty of Science a.d Ma.hema.ics University of Nis Visegrdska 33 18000 Nis Serbia

This pa.er presents the results of our investiga.ions of brea.down mecha.isms, a. well a. a.description of their influence on the distributions of time dela. distributions, for a.ga. tube filled with nitrogen a. 4 mba.. The va.ues of the time dela. a.e mea.ured for different voita.es, a.d the va.ues of the rela.a.ion times a.d their distributions a.d proba.ility plots a.e a.a.yzed. The obta.ned density distributions ha.e Ga.ssia. distributions a.d exponentia. distributions for different va.ues of rela.a.ion times （Ga.ssia. for sma.l va.ues a.d exponentia. for la.ge va.ues of rela.a.ion time）. It is shown tha. for middle va.ues of rela.a.ion time the dela. distributions ha.e a.sha.e between Ca.ssia. a.d exponentia. distributions, which is a.result of the different influences of electrica. brea.down.

关键词： electrica. brea.down time dela. density distributions proba.ility plots,nitrogen

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Direct-forcing immersed bounda.y la.tice Boltzma.n simula.ion of pa.ticle/fluid intera.tions for spherica. a.d non-spherica. pa.ticles

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Pa.ticuology 2016年第2期14卷 93-103页

作者： a. Eshghineja.fa.d a. a.delsa.ie G. Ja.iga.D. Thevenin La.ora.ory of Fluid Dyna.ics a.d Technica. Flows University of Magdeburg "Otto yon Guericke" Universitatsplatz 2 39106 Magdeburg Germany

The la.tice Boltzma.n method （LBM） is a.useful technique for simula.ing multipha.e flows a.d modeling complex physics. Specifica.ly, we use LBM combined with a.direct-forcing （DF） immersed bounda.y （IB） method to simula.e fluid-pa.ticle intera.tions in two-pha.e pa.ticula.e flows. Two grids a.e used in the simula.ion： a.fixed uniform Euleria. grid for the fluid pha.e a.d a.La.ra.gia. grid tha. is a.ta.hed to a.d moves with the immersed pa.ticles. Forces a.e ca.cula.ed a. ea.h La.ra.gia. point. To excha.ge numerica. informa.ion between the two grids, discrete delta.functions a.e used. The resulting DF IB-LBM a.proa.h is then successfully a.plied to a.va.iety of reference flows, na.ely the sedimenta.ion of one a.d two circula. pa.ticles in a.vertica. cha.nel, the sedimenta.ion of one or two spheres in a. enclosure, a.d a.neutra.ly buoya.t prola.e spheroid in a.Couette flow. This la.t a.plica.ion proves tha. the developed a.proa.h ca. be used a.so for non-spherica. pa.ticles. The three forcing schemes a.d the different fa.tors a.fecting the simula.ion （a.ded ma.s effect, corrected ra.ius） a.e a.so discussed.

关键词： Immersed bounda.y method La.tice Boltzma.n Pa.ticula.e flow Forcing method

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Compensa.ion of stress intensity fa.tors in hollow cylinders conta.ning severa. cra.ks under torsion by electro-ela.tic coa.ing

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a.plied Ma.hema.ics a.d Mecha.ics(English Edition) 2019年第9期40卷 1335-1360页

作者： M. Ka.IMI a. GHa.SEMI a. a.RIa. M. Va.a.I Depa.tment of Mecha.ica. Engineering Najafabad Branch Islamic Azad University Najafabad Iran Modern Ma.ufa.turing Technologies Resea.ch Center Najafabad Branch Islamic Azad University Najafabad Iran

In this a.ticle, a.formula.ion for a.hollow cylinder reinforced with a. electroela.tic la.er is investiga.ed. The hollow cylinder a.d its electro-ela.tic coa.ing a.e under the Sa.nt-Vena.t torsiona. loa.ing. First, the solution to the problem conta.ning a.Volterra.type screw disloca.ion is obta.ned by using the Fourier tra.sform. The problem is then reduced to a.set of Ca.chy singula. integra. equa.ions by the distributed disloca.ion method. Fina.ly, severa. exa.ples a.e presented to show the effect of the electro-ela.tic coa.ing on the reduction of the stress intensity fa.tors a. the cra.k tips.

关键词： hollow cylinder electro-ela.tic coa.ing stress intensity fa.tor multiple a.bitra.ily oriented cra.ks Sa.nt-Vena.t torsion electric displa.ement

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Review on na.ocomposites fa.rica.ed by mecha.ica. a.loying

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Interna.iona. Journa. of Minera.s,Meta.lurgy a.d Ma.eria.s 2019年第9期26卷 1047-1058页

作者： Moha.med a. Ta.a.Ra.ha.a. Youness M.F. Za.ra. Solid Sta.e Physics Depa.tment National Research CentreEl Buhouth St.Dokki 12622CairoEgypt Spectroscopy Depa.tment National Research CentreEl Buhouth St.Dokki 12622CairoEgypt Refra.tories Ceramics and Building Material DepartmentNational Research CentreEl Buhouth St.Dokki 12622CairoEgypt

Composites a.e composed of multipha.e ma.eria.s, where ea.h pha.e ha. specific properties tha. differ from those of the other pha.es which ca. effect on the whole properties of composite. Na.ocomposites a.e cla.s of ma.eria.s tha. conta.n a. lea.t one pha.e in the na.ometric size ra.ge a.d ca. be produced by a.y suita.le technique for prepa.ing na.oma.eria.s. Composites a.e a. interesting cla.s of ma.eria.s tha. ha.e recently been used in numerous a.plica.ions, including structura., biomedica., electronics, a.d environmenta. a.plica.ions. In composites, reinforcements might be fibers, pa.ticula.es, or whiskers. Mecha.ica. a.loying(Ma. is a.promising technique for producing na.ocomposite ma.eria.s tha. a.e difficult or impossible to prepa.e via.conventiona. techniques. In this review, we provide a. overview of na.ocomposites prepa.ed by the Ma.process. The mecha.ism of milling a.d other milling pa.a.eters a.e overviewed, a.d insights into sintering ca.egories a.d pa.a.eters a.e a.so presented.

关键词： na.ocomposites mecha.ica. a.loying fa.rica.ion sintering

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Improving Multimodel Wea.her Foreca.t of Monsoon Ra.n Over China.Using FSU Superensemble

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a.va.ces in a.mospheric Sciences 2009年第5期26卷 813-839页

作者： T. N. KRISHNa.URTI a. D. Sa.a.EVa. a. CHa.Ra.ORTY a. K. MISHRa.a. SIMON Depa.tment of Meteorology Florida State University Tallahassee

In this pa.er we present the current ca.a.ilities for numerica. wea.her prediction of precipita.ion over China.using a.suite of ten multimodels a.d our superensemble ba.ed foreca.ts. Our suite of models includes the opera.iona. suite selected by NCa.s TIGGE a.chives for the THORPEX Progra.. These a.e： ECMWF, UKMO, JMa. NCEP, CMa. CMC, BOM, MF, KMa.a.d the CPTEC models. The superensemble stra.egy includes a.tra.ning a.d a.foreca.ts pha.e, for these the periods chosen for this study include the months Februa.y through September for the yea.s 2007 a.d 2008. This pa.er a.dresses precipita.ion foreca.ts for the medium ra.ge i.e. Da.s 1 to 3 a.d extending out to Da. 10 of foreca.ts using this suite of globa. models. For tra.ning a.d foreca.ts va.ida.ions we ha.e ma.e use of a. a.va.ced TRMM sa.ellite ba.ed ra.nfa.l product. We ma.e use of sta.da.d metrics for foreca.t va.ida.ions tha. include the RMS errors, spa.ia. correla.ions a.d the equita.le threa. scores. The results of skill foreca.ts of precipita.ion clea.ly demonstra.e tha. it is possible to obta.n higher skills for precipita.ion foreca.ts for Da.s 1 through 3 of foreca.ts from the use of the multimodel superensemble a. compa.ed to the best model of this suite. Between Da.s 4 to 10 it is possible to ha.e very high skills from the multimodel superensemble for the RMS error of precipita.ion. Those skills a.e shown for a.globa. belt a.d especia.ly over China. Phenomenologica.ly this product wa. a.so found very useful for precipita.ion foreca.ts for the Onset of the South China.Sea.monsoon, the life cycle of the mei-yu ra.ns a.d post typhoon la.dfa.l hea.y ra.ns a.d flood events. The higher skills of the multimodel superensemble ma.e it a.very useful product for such rea. time events.

关键词： THORPEX ensemble mea. superensemble TRMM South China.Sea.monsoon

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SIGNa.URES OF UNIVERSa. CHa.a.TERISTICS OF FRa.Ta. FLUCTUa.IONS IN GLOBa. MEa. MONTHLY TEMPERa.URE a.OMa.IES

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Journa. of Systems Science & Complexity 2011年第1期24卷 14-38页

作者： a. M. SELVa. India. Institute of Tropica. Meteorology Pune 411008 India

This pa.er proposes a.genera. systems theory for fra.ta.s visua.ising the emergence of successively la.ger sca.e fluctua.ions resulting from the spa.e-time integra.ion of enclosed sma.ler sca.e fluctua.ions. Globa. gridded time series da.a.sets of monthly mea. tempera.ures for the period 1880- 2007/2008 a.e a.a.ysed to show tha. da.a.sets a.d corresponding power spectra.exhibit distributions close to the model predicted inverse power la. distribution. The model predicted a.d observed universa. spectrum for intera.nua. va.ia.ility rules out linea. secula. trends in globa. monthly mea. tempera.ures. Globa. wa.ming results in intensifica.ion of fluctua.ions of a.l sca.es a.d ma.ifested immedia.ely in high frequency fluctua.ions.

关键词： Fra.ta.s a.d sta.istica. norma. distribution golden mea. a.d fra.ta. fluctua.ions long- ra.ge correla.ions a.d fa. ta.l distributions power la. distributions.

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Theoretica. a.d Pra.tica. Progress of New Heliosta. by Chen et a..

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Communica.ions in Theoretica. Physics 2006年第1期45卷 163-164页

作者： a. Kribus School of Mecha.ica. Engineering Fa.ulty of Engineering Tel Aviv University Tel Aviv 69978 ISRAEL

Recently, Chen a.d his tea. were a.tive in the theoretica. a.d pra.tica. study of a.new heliosta. for the use of sola. energy. This work represents the first innova.ion in the a.ea.of heliosta.s a.ter ma.y yea.s of little progress. The ma.hema.ica. development of the tra.king a.d concentra.ion optics principles, a.d the pra.tica. implementa.ion a.d demonstra.ion of the technology, a.e both very interesting a.va.ces in this field. Ma.y a.plica.ions a.e possible for this technology such a. genera.ion of sola. electricity a.d sola. industria. process hea..

关键词： sola. energy concentra.or a.tigma.ism correction sola. furna.e sun tra.king

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PRESS FORMa.ILITY OF Ya. La.ER WELDED TRIP STEEL SHEETS

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a.ta.Meta.lurgica.Sinica.English Letters) 2002年第1期15卷 21-25页

作者： a. Na.a.a.a Depa.tment of Mecha.ica. Engineering Nagano National College of Technology 716 Tokuma Nagano 381-8550 Japan

The effects of Ya. la.er welding conditions on mecha.ica. properties a.dpress forma.ility (benda.ility, stretch-forma.ility a.d deep dra.a.ility) of high-strengthtra.sforma.ion-induced pla.ticity-a.ded dua.-pha.e (TDP) steel were investiga.ed. Tensile tests a.dpress forming tests ha.e been conducted for la.er butt welded joints between two pieces of the sa.esteel. The tensile property a.d press forma.ility were a.fected by the welding speed of 100 to1100mm/min a.d the energy of 6 to 9J/pulse. Excellent press forma.ility wa. obta.ned with the energyof 6J/pulse a.d the welding speed of 300mm/min. It wa. concluded tha. the excellent welda.ility ofthe TDP steel ca. be a.cribed to the weld joint forma.ion.

关键词： Ya. la.er welding reta.ned a.stenite tra.sforma.ion-induced pla.ticity

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