检索结果-南通市图书馆

d.rect sm.lting process for stainless steel crud. alloy recovery from.m.xed.low-grad. chrom.te, nickel laterite and.m.nganese ores

在线全文

学校读者我要写书评

暂无评论

Journal of Iron and.Steel Research International 2018年第5期25卷 515-523页

作者： Rom.e d. Laranjo Nathaniel m. Anacleto College of Engineering Jose Rizal m.m.rial State University d.pitan City Philippines m.tallurgical Ceramics and Mining Engineering Department College of Engineering MSU-Iligan Institute of Technology Iligan City Philippines

Stainless steel crud. alloy recovery from.d.rect sm.lting of low-grad. chrom.te, nickel laterite and.m.nganese ores was investigated. The m.xed.low-grad. ores were d.rectly sm.lted.in an elevator furnace at sm.lting tem.eratures ranging from.1550 to 1600 ℃. Sm.lting experim.nts were cond.cted.in a laboratory elevator furnace equipped.with 8 U-shaped.high- quality m.lybd.num.d.silicid. heating elem.nts. A low-grad. coal was used.as the red.ctant. Experim.ntal results showed.that the recovery of Fe, Cr, Ni, m. and.Si within the alloy increased.from.34.22, 60.27, 57.14, 25.42 and.13.02% to 69.91, 99.26, 86.02, 60.8 and.34.21%, respectively, when the tem.erature was increased.from.1550 to 1600 ℃. There was a general increase in the total recoveries of Fe, Cr, and.Ni in the alloy with CaO ad.ition increasing from.0.4 g up to 1.2 g. However, the recoveries of m. and.Si vivid.y d.creased.as the CaO contents were increased. In general, the recoveries of the m.tal contents of the crud. alloy increase with the increase in the am.unt of m.nganese ore. Com.ared.to the recoveries of Fe, Cr, and.Ni when CaO was ad.ed. the recoveries of Fe, Cr and.Ni were lower when m.nganese ore was used.as an ad.itive.

关键词： d.rect sm.lting · Flux · Nickel laterite ore · Chrom.te ore ·m.nganese ore · Red.ctant · Low-grad. coal ·Stainless steel crud. alloy

State Feed.ack Tracking Control for Ind.rect Field.oriented.Ind.ction m.tor Using Fuzzy Approach

在线全文

维普期刊数据库

学校读者我要写书评

暂无评论

International Journal of Autom.tion and.com.uting 2013年第2期10卷 99-110页

作者： m. Allouche m. Chaabane m. Souissi d. m.hd. F. Tad.o Laboratory of Sciences and.Techniques of Autom.tic Control and.Com.uter Engineering (Lab-STA) National School of Engineering of SfaxUniversity of Sfax Laboratory of Com.uter and.Autom.tic for System.(LIAS) Higher School of Engineering of Poitiers (ESIP) University of Poitiers d.partm.nt of System. Engineering University of Valladolid

This paper d.als with the synthesis of fuzzy controller applied.to the ind.ction m.tor with a guaranteed.m.d.l reference tracking perform.nce. First, the Takagi-Sugeno （T-S） fuzzy m.d.l is used.to approxim.te the nonlinear system.in the synchronous d.q fram. rotating with field.oriented.control strategy. Then, a fuzzy state feed.ack controller is d.signed.to red.ce the tracking error by m.nim.zing the d.sturbance level. The proposed.controller is based.on a T-S reference m.d.l in which the d.sired.trajectory has been specified. The inaccessible rotor flux is estim.ted.by a T-S fuzzy observer. The d.veloped.approach for the controller d.sign is based.on the synthesis of an augm.nted.fuzzy m.d.l which regroups the m.d.l of ind.ction m.chine, fuzzy observer, and.reference m.d.l. The gains of the observer and.controller are obtained.by solving a set of linear m.trix inequalities （Lm.s）. Finally, sim.lation and.experim.ntal results are given to show the perform.nce of the observer-based.tracking controller.

关键词： Fuzzy tracking control H∞ perform.nce feed.ack controller linear m.trix inequality (Lm.) fuzzy observer

Iterative com.utational approach to the solution of the Ham.lton-Jacobi-Bellm.n-lsaacs equation in nonlinear optim.l control

在线全文

学校读者我要写书评

暂无评论

Control Theory and.Technology 2018年第1期16卷 38-48页

作者： m. d. S. ALIYU d.partm.nt of Electrical Engineering King Faisal University AI-Ahsa 31982 Saudi Arabia

In this paper, iterative or successive approxim.tion m.thod. for the Ham.lton-Jacobi-Bellm.n-lsaacs equations （HJBIEs） arising in both d.term.nistic and.stochastic optim.l control for affine nonlinear system. are d.veloped. Convergence of the m.thod. are established.und.r fairly m.ld.assum.tions, and.exam.les are solved.to d.m.nstrate the effectiveness of the m.thod.. However, the results presented.in the paper are prelim.nary, and.d. not yet im.ly in anyway that the solutions com.uted.will be stabilizing. m.re im.rovem.nts and.experim.ntation will be required.before a satisfactory algorithm.is d.veloped.

关键词： Ham.lton-Jacobi-Bellm.n-lsaac equation vector id.ntity fixed.point theory successive approxim.tion m.thod.bound.d.continuous functions convergence Riccati equation

Interaction between B-d.ped.C60 Fullerene and.Glycine Am.no Acid.from. First-Principles Sim.lation

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 Physics Letters 2010年第4期27卷 83-86页

作者： m. d. Ganji H. Yazd.ni d.partm.nt of Chem.stry Islamic Azad University Ghaemshahr branch Mazandaran Iran

The possibility of form.tion of com.lexes between glycine and.boron d.ped.C60 （C59B） fullerene is investigated.and.com.ared.with that of C60 fullerene by using the d.nsity functional theory calculations. It has been found.that the bind.ng of glycine to C59B generated.the m.st stable com.lexes via its carbonyl oxygen active site, with a bind.ng energy of-37.89 kcal/m.l, while the glycine m.lecule prefers to bind.to the pure C60 cage via its am.no nitrogen active site, consistent with the recent experim.ntal and.theoretical stud.es. We have also tested.the stability of the m.st stable Gly-C59B com.lex with ab initio m.lecular d.nam.cs sim.lation, carried.out at room.tem.erature. These ind.cate that the B-d.ped.C60 fullerenes seem.to be m.re suitable m.terials for bind.ngs to proteins than pure C60 fullerenes.

关键词： Surfaces interfaces and.thin film. Biological physics Cond.nsed.m.tter: structural m.chanical & therm.l Chem.cal physics and.physical chem.stry

An Efficient m.lti-Scale m.d.lling Approach for ssd.A m.tion in Fluid.Flow

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 Bionic Engineering 2008年第4期5卷 299-307页

作者： m. Benke E. Shapiro d. d.ikakis Fluid.m.chanics and.Com.utational Science Group Department of Aerospace Sciences Cranfield University

The paper presents a m.lti-scale m.d.lling approach for sim.lating m.crom.lecules in fluid.flows. m.crom.lecule transport at low num.er d.nsities is frequently encountered.in biom.d.cal d.vices, such as separators, d.tection and.analysis system.. Accurate m.d.lling of this process is challenging d.e to the wid. range of physical scales involved. The continuum.approach is not valid.for low solute concentrations, but the large tim.scales of the fluid.flow m.ke purely m.lecular sim.lations prohibitively expensive. A prom.sing m.lti-scale m.d.lling strategy is provid.d.by the m.ta-m.d.lling approach consid.red.in this paper. m.ta-m.d.ls are based.on the coupled.solution of fluid.flow equations and.equations of m.tion for a sim.lified.m.chanical m.d.l of m.crom.lecules. The approach enables sim.lation of ind.vid.al m.crom.lecules at m.croscopic tim. scales. m.ta-m.d.ls often rely on particle-corrector algorithm., which im.ose length constraints on the m.chanical m.d.l. Lack of robustness of the particle-corrector algorithm.em.loyed.can lead.to slow convergence and.num.rical instability. A new FAst Linear COrrector （FALCO） algorithm.is introd.ced.in this paper, which significantly im.roves com.utational efficiency in com.arison with the wid.ly used.SHAKE algorithm. Valid.tion of the new particle corrector against a sim.le analytic solution is perform.d.and.im.roved.convergence is d.m.nstrated.for ssd.A m.tion in a lid.d.iven m.cro-cavity.

关键词： m.lti-scale m.d.lling d.A m.crom.lecule transport m.ta-m.d.lling particle corrector

Experim.ntal Investigation of Flow Instabilities in a Lam.nar Separation Bubble

在线全文

学校读者我要写书评

暂无评论

Journal of Therm.l Science 2014年第3期23卷 203-214页

作者： Sim.ni d. Ubald. m. Zunino P. d.m.-Università d. GenovaVia m.ntallegro 1 I-16145 Genova Italy d.m.-Università d. Genova Via Montallegro 1 I-16145 Genova Italy

The present paper reports the results of a d.tailed.experim.ntal stud. aim.d.at investigating the d.nam.cs of a lam.nar separation bubble, from.the origin of separation up to the breakd.wn to turbulence of the large scale co- herent structures generated.as a consequence of the Kelvin-Helm.oltz instability process. m.asurem.nts have been perform.d.along a fiat plate installed.within a d.uble contoured.test section, d.signed.to prod.ce an ad.erse pressure grad.ent typical of Ultra-High-Lift turbine blad. profiles, which ind.ces the form.tion of a lam.nar separation bubble at low Reynold. num.er cond.tion. m.asurem.nts have been carried.out by m.ans of com.le- m.ntary techniques： hot-wire （HW） anem.m.try, Laser d.ppler Velocirnetry （Ld.） and.Particle Im.ge Veloci- m.try （PIV）. The high accuracy 2-d.m.nsional Ld. results allow investigating reverse flow m.gnitud. and.both Reynold. norm.l and.shear stress d.stributions along the separated.flow region, while the high frequency response of the HW anem.m.ter allows analyzing the am.lification process of flow oscillations ind.ced.by instability m.chanism.. PIV results com.lem.nt the flow field.analysis provid.ng inform.tion on the generation and.evolu- tion of the large scale coherent structures shed.as a consequence of the separated.shear layer roll-up, through in- stantaneous velocity vector m.ps. The sim.ltaneous analysis of the d.ta obtained.by m.ans of the d.fferent m.as- uring techniques allows an in d.pth view of the instability m.chanism. involved.in the transition/reattachrnent processes of the separated.shear layer.

关键词： Ultra-High-Lift turbine profiles separated.flow transition m.d. streaks Kelvin-Helm.oltz instabil- ity linear stability theory

Com.arison of optical d.tection system.PVd. d.tection system.and.PVd. need.e hyd.ophone for optoacoustic tom.graphy

在线全文

学校读者我要写书评

暂无评论

Chinese Optics Letters 2005年第10期3卷 593-596页

作者： m. d. Abolhassani m. Hejazi A. Ahm.d.an A. Am.ad. m.d.cal Physics and.Bioengineering d.partm.nt Faculty of Medicine Tehran University of Medical Sciences Tehran Iran & Research Centre for Science and.Technology in m.d.cine RCSTIM Institute of Physics Sharif University Tehran Iran

Optoacoustic tom.graphy （PAT） is a two-d.m.nsional m.d.cal im.ging m.thod.that has the ad.antage of optical contrast and.resolution of ultrasonic waves. The d.tection system. with a high sensitivity can be used.for d.tecting sm.ll tum.rs, located.d.eply in hum.n tissues, such as the breast. In this stud., the sensitivity of existing ultrasonic d.tection system. has been com.ared.experim.ntally with that by using therm.elastic waves as a broad.and.ultrasonic source. For the com.arison, an optical stress transd.cer （OST）, a polyvinylid.ne d.fluorid. （PVd.） sheet and.a calibrated.PVd. need.e hyd.ophone were used. To ensure all of the d.tection system. interrogated.by the sam. ultrasonic field. a sm.ll optical instrum.nt that fixed.the generating laser head.was constructed. The sensitivity was evaluated.by m.asuring signalto-noise ratios （SNRs） and.noise equivalent pressures （NEPs）. The PVd. system. with a 4-kPa NEP has a 22 d. better perform.nce than the OST. The OST showed.nearly the sam. sensitivity as the hyd.ophone for d.tecting ultrasound.waves at a 1-cm.d.stance in water. PVd. d.tection system.provid.s a useful tool for im.ging of soft tissues because of its high sensitivity and.broad.d.tection range.

关键词： PVd. Com.arison of optical d.tection system.PVd. d.tection system.and.PVd. need.e hyd.ophone for optoacoustic tom.graphy

Influence of m.tal support in-plane sym.etry on the corrugation of hexagonal boron nitrid. and.graphene m.nolayers

在线全文

学校读者我要写书评

暂无评论

Nano Research 2018年第9期11卷 4643-4653页

作者： Antonio d. m.rtinez-Galera Jose m. Gom.z-Rod.iguez d.partam.nto d. Fisica d. la m.tefia Cond.nsad. Universidad Autonoma de Madrid Madrid E-28049 Spain Cond.nsed.m.tter Physics Center (IFIm.C) UniversidadAutdnoma de Madrid Madrid E-28049 Spain Instituto Nicold. Cabrera Universidad Autonoma de Madrid Madrid E-28049 Spain

Pred.cting the properties of two-d.m.nsional （2d. m.terials as graphene and.hexagonal boron nitrid. （h-BN） m.nolayers after their growth on any given substrate is a m.jor challenge. While the influence of the electron configuration of the atom. of the und.rlying surface is well-und.rstood. the effect of substrate geom.try still rem.ins unclear. The structural properties of h-BN m.nolayers grown on a rectangularly packed.Rh（110） surface were characterized.in situ by ultrahigh vacuum.scanning tunneling m.croscopy and.were com.ared.to those that this m.terial exhibits when grown on substrates showing d.fferent crystallographic orientations. Although the h-BN m.nolayer grown on Rh（110） was d.m.nated.by a unique quasiunid.m.nsional m.ir6 pattern, suggesting consid.rable interface interaction, the m.ir6 corrugation was unexpected.y sm.ller than those reported.for strongly interacting interfaces with hexagonal-term.nated.substrates, owing to d.fferences in the possible bind.ng land.capes at interfaces with d.fferently oriented.substrates. m.reover, a rule was d.rived.for pred.cting how interface corrugation and.the existence and.extent of subregions within m.ir6 supercells containing favorable sites for orbital m.xing between h-BN m.nolayers and.their supports d.pend.on substrate sym.etry. These general sym.etry consid.rations can be applied.to num.rous 2d.m.terials, includ.ng graphene, thereby enabling the pred.ction of how substrate choice d.term.nes the properties of these m.terials. Furtherm.re, they could.also provid. new routes for tuning 2d.m.terial properties and.for d.veloping nanotem.lates showing d.fferent geom.tries for Krowing ad.orbate superlattices.

关键词： hexagonal boron nitrid. graphene two-d.m.nsional m.terials scanning tunneling m.croscopy m.ire superstructures nanotem.lates

Effects of nano-void. and.nano-cracks on the elastic properties of a host m.d.um. xfem.m.d.ling with level-set function and.free surface energy

在线全文

维普期刊数据库

学校读者我要写书评

暂无评论

Acta m.chanica Sinica 2019年第4期35卷 799-811页

作者： B.E. Hachi d. Hachi m. Haboussi Laboratoire d. d.veloppem.nt en m.canique et m.tériaux (Ld.0}) Université de Djelfa PB 3117 Djelfa Algérie Laboratoire d.Autom.tique Appliquée et d.agnostics Ind.striels (LAAd.) Université de Djelfa PB 3117 Djelfa Algérie Laboratoire d.s Sciences d.s Procéd.s et d.s m.tériaux (LSPm. Université Paris 13 UPR 3407 CNRS Paris France

This work d.als with the influences of nano-heterogeneities in the form.of void./cavities or cracks on the elastic (please confirm.which word.is correct. effective or elastic? Accord.ng to the title of paper, I choose elastic.) properties of a host m.d.um. With a relatively large ratio of apparent-surface to volum. and.particularly strong physical interactions with the surround.ng m.d.um.at nano-scale, nano-heterogeneities can potentially affect the elastic(effective or elastic?) properties of the parent m.d.um.(m.trix) containing them.in a significant m.nner. This has been reported.by various theoretical and.experim.ntal stud.es, som. of them.are d.scussed.in the present paper. To d.scribe the positive (reinforcem.nt) or negative (d.grad.tion) effect of the nano-heterogeneities from.the m.d.ling perspective, it is necessary to take into account the energy of interfaces/surfaces between nano-heterogeneities and.the m.trix which, by the fact of the relatively large extent of their apparent surface and.their strong physical interaction with their neighborhood. can no longer be neglected.com.ared.to those of the volum. energy. Thus, to account for the effects of interfaces/surfaces in a nanostructured.heterogeneous m.d.um. the coherent interface m.d.l is consid.red.in the present investigation within a period.c hom.genization proced.re. In this interface/surface m.d.l, the d.splacem.nt vector is assum.d.to be continuous across the interface while the stress vector is consid.red.to be d.scontinuous and.satisfying the Laplace-Young equations. To solve these equations coupled.to the classical m.chanical equilibrium.problem. a num.rical sim.lation tool is d.veloped.in a two-d.m.nsional (2d. context using the eXtend.d.Finite Elem.nt m.thod.(XFEm. and.the Level-Set functions. The d.veloped.num.rical tool is then used.to carry out a d.tailed.analysis about the effect of nano-heterogeneities on the overall m.chanical properties of a m.d.um. The nano-heterogeneities are present

关键词： Interface/Surface energy XFEm Level-Set function Period.c hom.genization Nano-void./Nano-cavities Nano-cracks Nano-inclusions/Nano-heterogeneities