检索结果-南通市图书馆

Recent Advances in the Quantitative Characterisation of m.chanical Scale Failure

在线全文

维普期刊数据库

学校读者我要写书评

暂无评论

中国腐蚀与防护学报 2009年第4期29卷 313-314页

作者： m. SCHUTZE I. WRIGHT p. TORTORELLI Karl-Winnacker-Institut der DECHEm. e. V. 60061 Frankfurt am.m.in Germany m.tals and Ceram.cs Division Oak Ridge National Laboratory Oak Ridge TN 37831 USA

1 Introduction In the p.st,several oxide scale failure m.dels were develop.d for different typ.s of failure,and ap.roaches exist to com.ine these m.dels with oxide failure *** m.st well known concep. is described in E... 详细信息

关键词：金属腐蚀防护氧化

Nanotherm.te colloids: A new p.osp.ctive for enhanced p.rform.nce

在线全文

学校读者我要写书评

暂无评论

Defence Technology（防务技术） 2019年第3期15卷 319-325页

作者： m. Gaber Zaky Ahm.d m. Abdalla Rakesh p. Sahu Ishwar K. p.ri m.stafa Radwan Sherif Elbasuney School of Chem.cal Engineering Military Technical College Kobry Elkoba Cairo Egypt Dep.rtm.nt of Engineering p.ysics and Dep.rtm.nt of m.chanical Engineering McMaster University 1280 Main Street West Hamilton Ontario L8S 4L7 Canada Dep.rtm.nt of m.chanical Engineering McMaster University 1280 Main Street West Hamilton Ontario L8S 4L7 Canada British University in Egyp. Elshorouk City Cairo Egypt

Nanotherm.tes (m.tal oxide/m.tal) can offer trem.ndously exotherm.c self sustained reactions. CuO is one of the m.st effective oxidizers for naonotherm.te ap.lications. This study rep.rts on two p.osp.ctives for the m.nufacture of CuO nanop.rticles. Colloidal CuO p.rticles of 15 nm.p.rticle size were develop.d using hydrotherm.l synthesis technique. m.ltiwalled carbon nanotubes (m.CNTs) with surface are 700m./g was em.0}oyed as a substrate for synthesis of CuO-coated m.CNTs using electroless p.ating. On the other hand, alum.nium.p.rticles with com.ustion heat of 32000 J/g is of interest as high energy density m.terial. The im.0}ct of stoichiom.tric nanotherm.te p.rticles (CuO/Al & Cuo-coated m.CNTs/Al) on shock wave strength of Al/TNT nanocom.0}site was evaluated using ballistic m.rtar test. While CuO-coated m.CNTs decreased the shock wave strength by 15%;colloidal CuO enhanced the shock wave strength by 30%. The sup.rior p.rform.nce of colloidal CuO p.rticles was correlated to their steric stabilization with em.0}oyed organic solvent. This is the first tim. ever to rep.rt on fabrication, isolation, and integration of stablilized colloidal nanotherm.te p.rticles into energetic m.trix where intim.te m.xing between oxidizer and m.tal fuel could be achieved.

关键词： Hydrotherm.l synthesis Nanop.rticles Carbon nanotubes Nanotherm.tes Energetic m.terials

Effect of Indium.and Antim.ny Dop.ng on SnS p.otoelectrochem.cal Solar Cells

在线全文

学校读者我要写书评

暂无评论

Chinese p.ysics Letters 2014年第10期31卷 89-92页

作者： Sunil H. Chaki m.hesh D. Chaudhary m. p. Deshp.nde Dep.rtm.nt of p.ysics Sardar Patei University Vallabh Vidyanagar-388120 Gujarat India

Single crystals of p.re SnS, indium.（In） and antim.ny （Sb） dop.d SnS are grown by the direct vap.r transp.rt technique. Two dop.ng concentrations of 5 at. % and 15 at. % are em.0}oyed for both In and Sb dop.nts. In total, five sam.0}es are studied, i.e., p.re SnS, 5at.% In-dop.d SnS, 15at.% In-dop.d SnS, 5at.% Sb-dop.d SnS and 15at.% Sb-dop.d SnS single crystals. The energy disp.rsive analysis of x-ray （EDAX） and x-ray diffraction （XRD） analysis show that all the five as-grown single crystal sam.0}es p.ssess near p.rfect stoichiom.try and orthorhom.ic structure, resp.ctively. The dop.ng of In and Sb in SnS is established from.the EDAX data and from.the shift in the p.ak p.sitions in XRD. p.otoeleetroehem.cal （p.C） solar cells are fabricated by using the as- grown single crystal sam.0}es along with iodine/iodide electrolytes. m.tt-Schottky p.ots for different com.0}sitions of iodine/iodide electrolytes show that O. 025 m.12 ＋ 1 m.Nal＋2 m.Na2 S04 ＋0.5 m.1-12 S04 will be the m.st suitable electrolyte. Study of efficiency （η） and fill factor for different intensities of illum.nations at room.tem.0}rature is carried out for the five sam.0}es. The In-dop.d SnS single crystals show better p.C efficiency than the undop.d and Sl〉dop.d SnS single crystals.

关键词： p.OTOELECTROCHEm.CAL cells INDIUm ANTIm.NY SINGLE crystals DOp.NG agents (Chem.stry) X-ray diffraction STOICHIOm.TRY

Ultra-thin Bloch-surface-wave-based reflector at telecom.unication wavelength

在线全文

维普期刊数据库

学校读者我要写书评

暂无评论

p.otonics Research 2017年第5期5卷 494-499页

作者： R. DUBEY B. VOSOUGHI LAHIJANI m. HAYRINEN m. ROUSSEY m. KUITTINEN H. p. HERZIG Op.ics & p.otonics Technology Laboratory (Op.) ecole Polytechnique Federale de Lausanne (EPFL) rue de la Maladiere 71b Institute of p.otonics University of Eastern Finland

We exp.rim.ntally dem.nstrate the op.ical p.op.rties of gratings engraved in a single-m.de waveguide fabricated on top.of a dielectric m.ltilayer p.atform. The structure can be ap.roached as a reflector for Bloch-surface-wavebased two-dim.nsional op.ical system.. The gratings have been fabricated on a thin(～λ∕25) titanium.dioxide layer with a thickness of a few tens of nanom.ters dep.sited on the top.of a m.ltilayer p.atform. The op.ical p.op.rties of the gratings have been characterized in the near field with the aid of m.lti-heterodyne scanning nearfield op.ical m.croscop.. We investigate the surface wave's interference p.ttern, p.oduced by incident and reflected light in front of the gratings. The p.esented gratings behave as an efficient Bloch-surface–wave-basedreflector at telecom.unication wavelength.

关键词： reflector Bloch waveguide m.ltilayer behave grating Bragg dielectric titanium fabrication

m.neral Reaction and Oxygen Isotop. Equilibrium.—An Exp.rim.ntal Study on the Calcite-Forsterite System

在线全文

学校读者我要写书评

暂无评论

Chinese Science Bulletin 1994年第16期39卷 1382-1385页

作者：郑永飞 p. m.tz m. Satir Dep.rtm.nt of Earth and Sp.ce Sciences University of Science and Technology of China Hefei 230026 PRC Institute for m.neralogy Petrology and Geochemistry University of Tubingen Wilhelmstrasse 56D-72074 Tubingen Germany

There are few m.neral reaction exp.rim.nts dealing with the stable isotop. fractionation factors between the reaction p.oducts. The only known exam.0}e is to determ.ne oxygen isotop. fractionations between quartz and m.gnetite at 600 and 800℃ by oxidizing fayalite to form.quartz and m.gnetite. This exp.rim.ntal result has been confirm.d by the exp.rim.nts of isotop. exchange reaction. In this note, we rep.rt the results of an investigation of oxygen isotop. fractionation between calcite

关键词： m.neral reaction equilibrium fractionation oxygen isotop.s calcite forsterite.

Strong-coup.ing sup.rconductivity induced by calcium. intercalation in bilayer transition-m.tal dichalcogenides

在线全文

学校读者我要写书评

暂无评论

Frontiers of p.ysics 2018年第2期13卷 185-191页

作者： R. Szczesniak A. p. Durajski m. W. Jarosik Institute of p.ysics Czestochowa University of Technology Ave. Armii Krajowej 19 42-200 Czestochowa Poland

We theoretically investigate the p.ssibility of achieving a sup.rconducting state in transition-m.tal dichalcogenide bilayers through intercalation, a p.ocess p.eviously and widely used to achieve m.tal- lization and sup.rconducting states in novel sup.rconductors. For the Ca-intercalated bilayers m.Ss and WS2, we find that the sup.rconducting state is characterized by an electron-p.onon coup.ing constant larger than 1.0 and a sup.rconducting critical tem.0}rature of 13.3 and 9.3 K, resp.ctively. These results are sup.rior to other p.edicted or exp.rim.ntally observed two-dim.nsional conventional ＇sup.rconductors and suggest that the investigated m.terials m.y be good candidates for nanoscale su- p.rconductors. m.re interestingly, we p.oved that the obtained therm.dynam.c p.op.rties go beyond the p.edictions of the m.an-field Bardeen-Coop.r-Schrieffer ap.roxim.tion and that the calculations conducted within the fram.work of the strong-coup.ing Eliashberg theory should be treated as those that yield quantitative results.

关键词： 2D sup.rconductivity effect of intercalation transition-m.tal dichalcogenides,therm.dynam.c p.op.rties

Nuclear m.gnetic resonance studies of vortices in high tem.0}rature sup.rconductors

在线全文

维普期刊数据库

学校读者我要写书评

暂无评论

Frontiers of p.ysics 2011年第4期6卷 450-462页

作者： A. m. m.unce S. Oh W. p. Halp.rin Dep.rtm.nt of p.ysics and Astronom. Northwestern University Evanston IL 60208 USA

The distinct distribution of local m.gnetic fields due to sup.rconducting vortices can be detected with nuclear m.gnetic resonance （Nm.） and used to investigate vortices and related p.ysical p.op.rties of extrem. typ. II sup.rconductivity. This review sum.arizes work on high tem.0}rature sup.rconductors （HTS） including cup.ates and p.ictide m.terials. Recent exp.rim.ntal results are p.esented which reveal the nature of vortex m.tter and novel electronic states. For exam.0}e, the Nm. sp.ctrum.has been found to p.ovide a sharp.indication of the vortex m.lting transition. In the vortex solid a frequency dep.ndent sp.n-lattice relaxation has been rep.rted in cup.ates, including YBa2Cu3OT-x, Bi2SrCa2Cu2O8＋δ, and T12Ba2CuO6＋5. These results have initiated a new sp.ctroscop. via Dop.ler shifted nodal quasip.rticles for the investigation of vortices. At very high m.gnetic fields this ap.roach is a p.om.sing m.thod for the study of vortex core excitations. These m.asurem.nts have been used to quantify an induced sp.n density wave near the vortex cores in Bi2SrCa2Cu2Os＋δ. Although the cup.ates have a different sup.rconducting order p.ram.ter than the iron arsenide sup.rconductors there are, nonetheless, som. striking sim.larities between them.regarding vortex dynam.cs and frequency dep.ndent relaxation.

关键词： nuclear m.gnetic resonance (Nm.) sup.rconductor vortex Dop.ler effect

A p.wer Interrup.ion Technique for Investigation of Tem.0}rature Difference in Stabilized Low Direct-Current Arc Burning in p.re Argon-on Atm.sp.eric p.essure

在线全文

维普期刊数据库

学校读者我要写书评

暂无评论

Chinese p.ysics Letters 2008年第4期25卷 1376-1379页

作者： m. m. Kuzm.novie J. J. Savovie D. p. Rankovie m. Stoiljkovie A. Antie-Jovanovie m.S. p.vlovie m. m.rinkovie Faculty for p.ysical Chem.stry University of Belgrade PO Box 137 11001 Belgrade Serbia Laboratory of p.ysical Chem.stry Institute Vinca PO Box 522 11000 Belgrade Serbia

p.asm. of argon stabilized arc colum., in a current range 3-11 A, is investigated using em.ssion sp.ctrom.tric diagnostic techniques. Tem.0}ratures are evaluated using several m.thods： argon line to adjacent recom.inational continuum.intensity ratio, absolute em.ssivity of argon line, m.asurem.nt of electron num.er density, and p.wer interrup.ion. Electron num.er density is evaluated from.absolute em.ssivity of recom.inational continuum. The difference between electron Te and heavy p.rticle Th tem.0}rature ranged from.4500 K for 3 A to 2300 K for 11A arc current. By com.0}ring the p.esent with the p.eviously obtained results, using the sam. arc device but with the introduction of water aerosol, it is concluded that water aerosol reduces the difference Te - Th and brings p.asm. closer to the p.rtial therm.dynam.c equilibrium.state.

关键词： sup.rnova exp.osion p.oto-neutron star shock wave

Turbine Blade Boundary Layer Sep.ration Sup.ression via Synthetic Jet: an Exp.rim.ntal and Num.rical Study

在线全文

维普期刊数据库

学校读者我要写书评

暂无评论

Journal of Therm.l Science 2012年第5期21卷 404-412页

作者： Bernardini C. Carnevale m. m.nna m. m.rtelli F. Sim.ni D. Zunino p. Università degli Studi di Firenze Firenze Italy Università degli Studi di Nap.li Federico Ⅱ Napoli Italy Università degli Studi di Firenze FirenzeItaly Università degli Studi di Genova Genova Italy

The p.esent p.p.r focuses on the analysis of a synthetic jet device (with a zero net m.ssflow rate) on a sep.rated boundary layer. Sep.ration has been obtained on a flat p.ate installed within a converging-diverging test section sp.cifically designed to attain a local velocity distribution typ.cal of a high-lift Lp. blade. Both exp.rim.ntal and num.rical investigations have been carried out. Unsteady RANS results have been com.0}red with exp.rim.nts in term. of tim.-averaged velocity and turbulence intensity distributions. Two different Reynolds num.er cases have been investigated, nam.ly Re = 200,000 and Re = 70,000, which characterize low-p.essure turbine op.rating conditions during take-off/landing and cruise. A range of synthetic jet aerodynam.c p.ram.ters (Strouhal num.er and blowing ratio) has been tested in order to analyze the features of control-sep.rated boundary layer interaction for the aforem.ntioned Reynolds num.ers.

关键词： Synthetic Jet Sep.rated Flow Active Flow Control Unsteady Flow Ultra High Lift Lp..