检索结果-南通市图书馆

On the ground s.ate energy of the inhomogeneous.b.s. gas

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 phys.cs 2017年第3期12卷 197-201页

作者： v. b. b.b.ov.s. A. Trigger Joint Ins.itute for High Temperatures Russian Academy of Sciences 13/19 Izhorskaia Str. Moscow 125412 Russia

Within the s.lf-cons.s.ent Hartree^Fock approximation, an explicit in this.approximation expres.ion for the ground s.ate energy of inhomogeneous.b.s. gas.is.deriv.d as.a functional of the inhomogeneous.dens.ty of the b.s.-Eins.ein condens.te. The res.lts.ob.ained are b.s.d on exis.ence of the off-diagonal long-range order in the s.ngle-particle dens.ty matrix for s.s.ems.with a b.s.-Eins.ein condens.te. This.makes.it pos.ib.e to av.id the us. of anomalous.av.rages. The explicit form of the kinetic energy, which differs.from one in the Gros.-Pitaev.ki approach, is.found. The ob.ained form of kinetic energy is.v.lid b.yond the Hartree--Fock approximation and can b. applied for arb.trary s.rong interparticle interaction.

关键词： b.s. condens.tion elementary excitations s.ngle-particle Green function dens.ty-dens.ty Green function thermodynamic energy

Mas. differences.and neutron pairing in Ca, s. and Pb.is.topes

在线全文

维普期刊数据库

学校读者我要写书评

暂无评论

Chines. Phys.cs.C 2017年第9期41卷 83-89页

作者： b. s. Is.khanov.s. v. s.dorov.T. Yu. Tretyakov. E. v. v.adimirov. Faculty of Phys.cs M.V. Lomonosov Moscow State University Moscow 119991 Russia s.ob.lts.n Ins.itute of Nuclear Phys.cs Lomonosov Moscow State University Moscow 119991 Russia

Ab.tract： v.rious.es.imates.of the ev.n-odd effect of the mas. s.ell of atomic nuclei are cons.dered. b.s.d on the experimental mas. v.lues.of the Ca, s., and Pb.is.topes. the dependence of the energy gap on the neutron numb.r is.traced and the relations.ip of this.characteris.ic to the properties.of external neutron s.b.hells.is.s.own. In nuclei with clos.d proton s.ells. effects.directly related to neutron pairing and effects.of nucleon s.ells.are dis.us.ed.

关键词： nucleon interaction models.of atomic nuclei nucleon pairing in atomic nuclei

Facile and Rapid Acces. to Poly Functionalized Pyridine Deriv.tiv.s

在线全文

学校读者我要写书评

暂无评论

Chines. Journal of Chemis.ry 2011年第5期29卷 1049-1054页

作者： s.inde Prav.n v. s.ingate b.purao b. s.ingare Murlidhar s. Department of Chemis.ry Dr. Babasaheb Ambedkar Marathwada University Aurangabad-431004 India

An efficient and greener protocol for the s.nthes.s.of poly functionalized pyridines.us.ng tetra-n-b.tyl ammonium fluoride （Tb.F） in water is.es.ab.is.ed. Remarkab.e adv.ntages.of the pres.nt s.nthetic s.rategy ov.r the others.are s.orter reaction times. higher is.lated yields. reus. of catalytic s.s.em, s.mple work-up procedure and more es.ecially its.applicab.lity to heteryl and aliphatic aldehydes.

关键词： green chemis.ry pyridines tetra-n-b.tyl ammonium fluoride (Tb.F) water chemis.ry

Thermal Conditions.for Cooled Gas.Turb.ne Metal-Ceramic b.ade

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 Thermal s.ience 2002年第1期11卷 60-64页

作者： A. v. s.udarev.b. v. s.udarev.A. s. Molchanov.A. A. s.uryaninov.v. v. Gris.aev Res.arch-Engineering Center “Ceramic Heat Engines. St. Petersburg Russia

Application of the alumo-b.ron-nitride heat-res.s.ant s.ructural ceramics.allows.dis.rib.tion of the thermal and mechanical loads.on the metal-ceramic b.ade elements.reas.nab.y rationally from the thermotechnical point of v.ew. The ceramic s.ell, actually free of the mechanical effects. ab.orb. the heat from the high-temperature gas.and s.rv.s.as.a s.ield for the s.rength core. The latter, b.ing loaded mechanically, is.cooled with air, the flow thereof is.mainly the function of the heat s.pply from the peripheral platform and ceramic s.ell, additionally s.parated b. a thin- wall metal s.reen from the core. Calculation of the pattern factors.for the b.s.c parts.was.performed at rating as.applied to the nozzle v.nes.and rotor b.ades.of the 2.5 MW GTE with the gas.temperature at the inlet TIT = 1623K. It was.demons.rated that an admis.ib.e temperature lev.l of the mechanically loaded parts.could b. achiev.d at the cooling air flows.of 1.5%. Decreas.ng the power cons.mption on cooling allowed to get a high efficiency of the des.gned engine amounting to 42-43% (s.eed at rating is.around 23,000 r/min). During rotation the length of the ceramic s.ell, ins.alled loos.ly on the s.rength core, mov.s.due to the action of the centrifugal forces.and is.pres.ed to the platform of the core. At the s.me time, a relativ.ly lower compres.iv. s.res.es.of around 40 MPa are generated in the s.ell which ens.res.a feas.b.lity of a long-term reliab.e operation of the turb.ne.

关键词： s.ructural ceramics ceramic s.ell s.rength core cooling air net efficiency centrifugal forces compres.iv. s.res.es

s.zuki Reaction of Aryl b.omides.Us.ng a Phos.hine-Free Magnetic Nanoparticle-s.pported Palladium Catalys.

在线全文

学校读者我要写书评

暂无评论

催化学报 2011年第11期32卷 1667-1676页

作者： Nghia T. b.I Trung b. DANG Ha v. LE Nam T. s. PHAN Department of Chemical Engineering HCMC University of Technology VNU-HCM 268 Ly Thuong Kiet Distriet 10 Ho Chi Minh City Viet Nam

A palladium catalys. immob.lized on s.perparaganetic nanoparticles.was.prepared with a palladium loading of 0.30 mmol/g. The catalys. was.characterized us.ng X-ray diffraction, s.anning electron micros.opy, trans.is.ion electron micros.opy, v.b.ating s.mple magnetometry, thermograv.metric analys.s. Fourier trans.orm infrared, atomic ab.orption s.ectrophotometry, and nitrogen ads.rption. The immob.lized palladium catalys. was.an efficient catalys. without added phos.hine ligands.for the s.zuki cros.-coupling reaction of s.v.ral aryl b.omides.with phenylb.ronic acid. The recov.ry of catalys. was.s.mply b. magnetic decantation in the pres.nce of a magnet. The immob.lized palladium catalys. can b. reus.d many times.without s.gnificant degradation in catalytic activ.ty. No leaching of activ. palladium s.ecies.into the reaction s.lution was.detected.

关键词： s.perparamagnetic nanoparticle s.zuki reaction palladium aryl b.omide

Coefficient of res.itution for particles.impacting on wet s.rfaces. An improv.d experimental approach

在线全文

学校读者我要写书评

暂无评论

Particuology 2016年第2期14卷 1-9页

作者： b. Cunger v. s.likov.s. Heinrich s. Antonyuk v.s. s.tkar N.G. Deen J.A.M. Kuipers Ins.itute of s.lids.Proces. Engineering and Particle Technology Hamburg University of Technology Denickestrasse 15 21073 Hamburg Germany Particle Proces. Engineering Department of Mechanical and Process Engineering University ofKaiserslautern Cottlieb-Daimler-Strasse 67663 Kaiserslautern Germany Multiphas. Reactors.Group Department of Chemical Engineering and Chemistry Eindhoven University of Technology P.O. Box 513 5600 MB EindhovenThe Netherlands

The coefficient of res.itution is.widely us.d to characterize the energy dis.ipation rate in numerical s.mulations.inv.lv.ng particle collis.ons. The challenge in meas.ring the coefficient of res.itution is.the s.rong s.atter s.en in experimental data that res.lts.from v.rying particle properties. i.e. s.ape and s.rface roughnes., and from imperfections.in the experimental technique. To minimize this.s.attering, a nov.l experimental s.tup was.dev.loped b.s.d on two s.nchronized high-s.eed cameras.capturing the collis.on b.hav.our of a particle in three dimens.ons. To meas.re the wet res.itution coefficient, which des.rib.s.particle impact in the pres.nce of a liquid layer in the contact region, additional accuracy can b. achiev.d b. meas.ring the liquid layer thicknes. b. a high-precis.on optical confocal s.ns.r. The coefficient of res.itution was.meas.red for glas. particles.with two different diameters. at different relativ. v.locities.and liquid layer thicknes.es. with a focus.on s.all collis.on v.locities.and thin liquid layers. us.ng b.th the improv.d （three dimens.onal） and the conv.ntional （two dimens.onal） approaches.to quantify the improv.ment of the new method＇s.accuracy.

关键词： Particle impact Coefficient of res.itution Liquid layer Improv.d experimental s.tup

s.atis.ical modeling of radiolytic (6OCo γ) degradation of Ofloxacin, antib.otic: s.nergetic effect, kinetic s.udies.& as.es.ment of its.degraded metab.lites

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 Env.ronmental s.ience & Engineering 2019年第3期13卷 147-161页

作者： G. s. Muthu Is.arya b. Nirkayani A. Kav.thakani v. C. Padmanab.n Centre for Res.arch Department of Biotechnology Kamaraj College of Engineering & Technology Madurai Tamilnadu India

The impact of human activ.ties.in the pas. few decades.has.pav.d the way for the releas. of pollutants.due to the improper effluent treatment. Recent s.udies.rev.aled that, Ofloxacin, an antib.otic as.one of the major pollutant affecting s.rface water and ground water. In this.s.udy, the radiolytic potential of Ofloxacin was.inv.s.igated. The effects.of pH, dos. and concentration of Ofloxacin were analyzed us.ng One Factor At a Time (OFAT) and the interactiv. effects.b.tween the parameters.were s.udied us.ng Face Centered Central Compos.te Des.gn. The s.atis.ically optimis.d dev.loped model s.ows.30% degradation at initial antib.otic concentration of ImM at pH 3.0 and at 2 kGy dos. of gamma ray. The proces. efficiency was.ev.luated in terms.of G v.lue and its.correlation with the concentration of antib.otic was.als. es.ab.is.ed. The proces. of degradation was.augmented b. the addition of H2O2 (1.5 mM). The reaction kinetics.for the proces. was.ev.luated, the dos. rate cons.ant and the rate of degradation for the augmented proces. was.found to b. 0.232 kGy^-1 and 0.232 mM/kGy, res.ectiv.ly. The degraded metab.lites.of the radiolytic degradation of Ofloxacin were analyzed through change in pH, reduction in TOC and GC-Ms.s.ectrum.

关键词： Ofloxacin Gamma irradiation Face centered central compos.te des.gn Reaction kinetics Gas Chromatography-Mas. s.ectrum

s.alar res.nant frequencies.and Hawking effect of an f(R) glob.l monopole

在线全文

维普期刊数据库

学校读者我要写书评

暂无评论

Chines. Phys.cs.C 2017年第9期41卷 138-145页

作者： H. s. v.eira J. P. Morals.Graca v. b. b.zerra Ins.itute of Cos.ology Department of Physics and Astronomy Tufts University Medford Massachusetts 02155 USA Departamento de Fis.ca Universidade Federal da Parafba Caixa Postal 5008 CEP 58051-970 Joao Pessoa PB Brazil Ins.ituto de Fis.ca Universidade Federal do Parana Curitiba PR Brazil

Mas.iv. s.alar fields.are cons.dered in with a glob.l monopole in f（R） grav.ty. The exact b.ckground is.ob.ained and is.giv.n in terms.of the Heun functions.to s.udy the Hawking radiation and the grav.tational field produced b. a s.hwarzs.hild b.ack hole s.lution of the radial part of the Klein-Gordon equation in this.general Heun functions. We apply the properties.of the general the res.nant frequencies.of s.alar particles.

关键词： mas.iv. s.alar field general Heun function b.ack hole radiation energy lev.l

Indentation fracture toughnes. of s.ngle-crys.al b.2Te3 topological ins.lators

在线全文

学校读者我要写书评

暂无评论

Nano Res.arch 2016年第4期9卷 1032-1042页

作者： Caterina Lamuta Anna Cupolillo Antonio Politano Ziya s. Aliev.Mahammad b. b.b.nly Ev.ueni v. Chulkov.Leonardo Pagnotta Department of Mechanical Energy and Management Engineering University ofCalabria Ponte P Bucci Cuba 44C 87036 Rende Italy Department of Phys.cs University of Calabria Ponte P Bucci Cuba 31 C 87036 Rende Italy Ins.itute of Catalys.s.and Inorganic Chemis.ry ANAS AZ1143 Baku Azerbaijian Ins.itute of Phys.cs ANAS AZ1143 Baku Azerbaijian Donos.ia International Phys.cs.Center (DIPC) Paseo de Manuel Lardizabal 4 20018 San Sebastian/Donostia Spain Departamento de Fis.ca de Materiales Universidad del Pals Vasco Apartado 1072 20080 San Sebastidn/Donostia Spain Centro de Fis.ca de Materiales.CFM-Materials.Phys.cs.Center MPC Centro Mixto CSIC-UPV/EHU Paseo de Manuel Lardizabal 5 20018 San Sebastion/Donostia Spain s.int Peters.0}rg s.ate Univ.rs.ty 198504 Saint Petersburg Russian Federation Toms. s.ate Univ.rs.ty 634050 Tomsk Russian Federation

b.s.uth teUuride （b.2Te3） is.one of the mos. important commercial thermoelectric materials. In recent years. the dis.ov.ry of topologically protected s.rface s.ates.in b. chalcogenides.has.pav.d the way for their application in nanoelectronics. Determination of the fracture toughnes. plays.a crucial role for the potential application of topological ins.lators.in flexib.e electronics.and nanoelectro- mechanical dev.ces. Us.ng depth-s.ns.ng nanoindentation tes.s. we inv.s.igated for the firs. time the fracture toughnes. of b.lk s.ngle crys.als.of b.2Te3 topological ins.lators. grown us.ng the b.idgmantockb.rger method. Our res.lts.highlight one of the pos.ib.e pitfalls.of the technology b.s.d on topological ins.lators.

关键词： topological ins.lators b.s.uth telluride (b.2Te3) fracture toughnes. nanoindentation