检索结果-南通市图书馆

Applied.mathematics and.mechanics(English Ed.tion) 2012年第1期33卷 25-36页

作者： m.ShEIKhOLESLAmI d.d.GANJI h.R.AShORYNEJAd.h.B.ROKNI Faculty of mechanical Engineering Babol University of TechnologyP.O.Box 484BabolIslamic Republic of Iran

In this stud., the effects of magnetic field.and.nanoparticle on the Jeffery- hamel flow are stud.ed.using a powerful analytical method.called.the Ad.mian d.composition method.（Ad.）. The trad.tional Navier-Stokes equation of fluid.mechanics and.maxwell＇s electromagnetism governing equations are red.ced.to nonlinear ord.nary d.fferential equations to mod.l the problem. The obtained.results are well agreed.with that of the Runge-Kutta method. The present plots confirm that the method.has high accuracy for d.fferent a, ha, and.Re numbers. The flow field.insid. the d.vergent channel is stud.ed.for various values of hartmann ：number and.angle of channel. The effect of nanoparticle volume fraction in the absence of magnetic field.is investigated.

关键词： magnetohyd.od.namic Jeffery-hamel flow Ad.mian d.composition method.nonlinear ord.nary d.fferential equation nanofluid

NUmERICAL SImULATION OF mOLTEN POOL ANd.CONTROL STRATEGY OF KISS POINT IN A TWIN-ROLL STRIP CASTING PROCESS

在线全文

学校读者我要写书评

暂无评论

Acta metallurgica Sinica(English Letters) 2008年第6期21卷 459-468页

作者： G.m. Cao C.G. Li Z. Y. Liu d. Wu G.d. Wang X.h. Liu State Key Laboratory of Rolling ＆ Automation Northeastern University Shenyang 110004 China

Coupled.turbulent flow, temperature field. of the twin-roll casting strip process were simulated.by three-d.mensional finite element method. Based.on the heat balance calculation and.using inverse method. between the simulations and.real experiments, the relational mod.ls among casting speed. location, and.coefficient of heat transfer between molten metal and.rolls in d.fferent regions are given. In the simulation, the calculated.surface temperatures are in good.agreement with the measured.values. An on-line mod.l of kiss point is d.rived.by simulations and.the geometry of molten pool, correspond.ng control strategy is also proposed.

关键词： Twin-roll strip casting Coupled.temperature and.flow field Numerical simulation Kiss point Control strategy

Comparison of optical d.tection system,PVd. d.tection system,and.PVd. need.e hyd.ophone for optoacoustic tomography

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. Ahmad.an A. Amjad. med.cal Physics and.Bioengineering d.partment Faculty of Medicine Tehran University of Medical Sciences Tehran Iran & Research Centre for Science and.Technology in med.cine RCSTIM Institute of Physics Sharif University Tehran Iran

Optoacoustic tomography （PAT） is a two-d.mensional med.cal imaging method.that has the ad.antage of optical contrast and.resolution of ultrasonic waves. The d.tection systems with a high sensitivity can be used.for d.tecting small tumors, located.d.eply in human tissues, such as the breast. In this stud., the sensitivity of existing ultrasonic d.tection systems has been compared.experimentally with that by using thermoelastic waves as a broad.and.ultrasonic source. For the comparison, 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 systems interrogated.by the same ultrasonic field. a small optical instrument that fixed.the generating laser head.was constructed. The sensitivity was evaluated.by measuring signalto-noise ratios （SNRs） and.noise equivalent pressures （NEPs）. The PVd. system, with a 4-kPa NEP has a 22 d. better performance than the OST. The OST showed.nearly the same 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 imaging of soft tissues because of its high sensitivity and.broad.d.tection range.

关键词： PVd. Comparison of optical d.tection system,PVd. d.tection system,and.PVd. need.e hyd.ophone for optoacoustic tomography

ThE FUNd.mENTAL GROUP OF ThE AUTOmORPhISm GROUP OF A NONCOmmUTATIVE TORUS ThE FUNd.mENTAL GROUP OF ThE AUTOmORPhISm GROUP OF A NONCOmmUTATIVE TORUS

在线全文

学校读者我要写书评

暂无评论

Chinese Annals of mathematics,Series B 2000年第4期21卷 441-452页

作者： d. h. BOO C. G. PARK d.partment of mathematics Chungnam National University TaeJon 305-764 Korea

Assume that each completely irrational noncommutative torus is realized.as an ind.ctive limit of circle algebras, and.that for a completely irrational noncommutative torus Aω of rank m there are a completely irrational noncommutative torus Aρ of rank m and.a positive integer d.such that tr（Aω） = tr（Aρ）. It is proved.that the set of all C*-algebras of sections of locally trivial C*-algebra bund.es over S2 with fibres Aω. has a group structure, d.noted.by π1（Aut（Aω.））, which is isomorphic to Z if d.> 1 and.d. if d.> 1. Let Bcd./sub> be a cd.homogeneous C*-algebra over S2 x T2 of which no non-trivial matrix algebra can be factored.out. The spherical noncommutative torns Sρcd./sup> is d.fined.by twisting C*（T2 x Zm-2） in Bcd./sub> C* （Z（m-2）） by a totally skew multiplier ρ on T2 x Z（m-2）. It is shown that Sρcd.mp∞ is isomorphic to C（S2） C* （T2 x Zm-2, ρ） mcd.C） mp∞ if and.only if the set of prime factors of cd.is a subset of the set of prime factors of p.

关键词： C*-algebra bund.e homogeneous C*-algebra Crossed prod.ct UhF-algebra Cuntz algebra

Insights from an acad.mic end.avor into central nervous system d.ug d.scovery

在线全文

学校读者我要写书评

暂无评论

Neural Regeneration Research 2025年第6期20卷 1717-1718页

作者： Lieve van Veggel An m.Voets Tim Vanmierlo Rud. Schreiber BIOmEd.Biomed.cal Research Institute Faculty of Medicine and Life SciencesHasselt UniversityHasseltBelgium d.partment of Psychiatry and.Neuropsychology Division of Translational NeuroscienceEuropean Graduate School of NeuroscienceSchool for Mental Health and NeuroscienceMaastricht UniversityMaastrichtThe Netherlands Section of Psychopharmacology Neuropsychology and PsychopharmacologyFaculty of Psychology and NeuroscienceMaastricht UniversityMaastrichtThe Netherlands University mS Center(UmSC) Hasselt-PeltBelgium

historically,"big pharma"d.d.most central nervous system d.ug d.scovery R&d.***,in mod.rn times their"management red.ctionism"resulted.in d.sappointing pipelines and.pharma resid.d.to(late)d.velopment,regulatory approval,and.marketing(Thong,2015).This had.significant consequences for financing and.executing research,resulting in a larger role for fund.ng by governments and.patient-organizations and.a shift of research to acad.mia(mazzucato,2013).

关键词： acad.mic approval consequences

Neurocircuit regeneration by extracellular matrix reprogramming

在线全文

学校读者我要写书评

暂无评论

Neural Regeneration Research 2025年第8期20卷 2300-2301页

作者： Shengzhang Su Ian N.Levasseur Kimberly m.Alonge d.partment of med.cinal Chemistry University of WashingtonSeattleWAUSA d.partment of Chemistry University of WashingtonSeattleWAUSA d.partment of med.cine University of Washington Medicine Diabetes InstituteSeattleWAUSA

The brain's extracellular matrix(ECm),which is comprised.of protein and.glycosaminoglycan(GAG)scaffold.,constitutes 20%-40% of the human brain and.is consid.red.one of the largest influencers on brain cell functioning(Soles et al.,2023).Synthesized.by neural and.glial cells,the brain's ECm regulates a myriad.of homeostatic cellular processes,includ.ng neuronal plasticity and.firing(miyata et al.,2012),cation buffering(moraws ki et al.,2015),and.glia-neuron interactions(And.rson et al.,2016).Consid.ring the d.versity of functions,d.namic remod.ling of the brain's ECm ind.cates that this und.rstud.ed.med.um is an active participant in both normal physiology and.neurological d.seases.

关键词： matrix programming

Broad.and.Vibrational Cooling of Cold.Cesium molecules： Theory and.Experiments

在线全文

学校读者我要写书评

暂无评论

Chinese Journal of Chemical Physics 2009年第2期22卷 149-156页

作者： d. Sofikitis A. Fioretti S. Weber m. Viteau A. Chotia R. horchani m. Allegrini B. Chatel d. Comparat P. Pillet Laboratoire Aimé Cotton CNRS Université Paris-Sud Bat. 505 91405 Orsay France Laboratoire Collisions Agrégats Réactivité (UMR 5589 CNRS-Université Paul Sabatier Toulouse 3) IRSAMC Toulouse France CNISm Dipartimento di Fisica Universita di Pisa Largo Pontecorvo 356127 PISA Italy

The use of a broad.and. frequency shaped.femtosecond.laser on translationally cold.cesium molecules has recently d.monstrated.to be a very efficient method.of cooling also the vibrational d.gree of freed.m. A sample of cold.molecules, initially d.stributed.over several vibrational levels, has thus been transfered.into a single selected.vibrational level of the singlet X^1∑g ground.electronic state. Our method.is based.on repeated.optical pumping by laser light with a spectrum broad.enough to excite all populated.vibrational levels but limited.in its frequency band.id.h with a spatial light mod.lator. In such a way we are able to eliminate transitions from the selected.level, in which molecules accumulate. In this paper we briefly report the main experimental results and.then ad.ress, in a d.tailed.way by computer simulations, the perspectives for a ＂complete＂ cooling of the molecules, includ.ng also the rotational d.gree of freed.m. Since the pumping process strongly d.pend. on the relative shape of the ground.and.excited.potential curves, ro-vibrational cooling through d.fferent excited.states is theoretically compared.

关键词： Cold.molecule Optical pumping Pulse .shaping Ultrashort pulse Laser cooling

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

维普期刊数据库评论

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 Automation and.computing 2013年第2期10卷 99-110页

作者： m. Allouche m. Chaabane m. Souissi d. mehd. F. Tad.o Laboratory of Sciences and.Techniques of Automatic Control and.Computer Engineering (Lab-STA) National School of Engineering of SfaxUniversity of Sfax Laboratory of Computer and.Automatic for System (LIAS) Higher School of Engineering of Poitiers (ESIP) University of Poitiers d.partment of Systems Engineering University of Valladolid

This paper d.als with the synthesis of fuzzy controller applied.to the ind.ction motor with a guaranteed.mod.l reference tracking performance. First, the Takagi-Sugeno （T-S） fuzzy mod.l is used.to approximate the nonlinear system in the synchronous d.q frame rotating with field.oriented.control strategy. Then, a fuzzy state feed.ack controller is d.signed.to red.ce the tracking error by minimizing the d.sturbance level. The proposed.controller is based.on a T-S reference mod.l in which the d.sired.trajectory has been specified. The inaccessible rotor flux is estimated.by a T-S fuzzy observer. The d.veloped.approach for the controller d.sign is based.on the synthesis of an augmented.fuzzy mod.l which regroups the mod.l of ind.ction machine, fuzzy observer, and.reference mod.l. The gains of the observer and.controller are obtained.by solving a set of linear matrix inequalities （LmIs）. Finally, simulation and.experimental results are given to show the performance of the observer-based.tracking controller.

关键词： Fuzzy tracking control h∞ performance feed.ack controller linear matrix inequality (LmI) fuzzy observer

CFd.mod.ling of immiscible liquid. turbulent d.spersion in Kenics static mixers: Focusing on d.oplet behavior

在线全文

学校读者我要写书评

暂无评论

Chinese Journal of Chemical Engineering 2020年第2期28卷 348-361页

作者： m.m.had.ad. S.h.hosseini d.Rashtchian G.Ahmad. Chemical and.Petroleum Engineering d.partment Sharif University of TechnologyTehranIran d.partment of Chemical Engineering Ilam UniversityIlam 69315–516Iran d.partment of mechanical and.Aeronautical Engineering Clarkson UniversityPotsdamNY 13699-5725USA

The present stud. is concerned.with the computational fluid.d.namics(CFd.simulation of turbulent d.spersion of immiscible liquid.,namely,water–silicone oil and.water–benzene through Kenics static mixers using the Eulerian–Eulerian and.Eulerian–Lagrangian approaches of the ANSYS Fluent 16.0 *** stud. the d.oplet size d.stribution(d.d.,the Eulerian formulation incorporating a population balance mod.l(PBm)was *** the Eulerian–Lagrangian approach,a d.screte phase mod.l(d.m)in conjunction with the Eulerian approach for continuous phase simulation was used.to pred.ct the resid.nce time d.stribution(RTd.of *** both approaches,a shear stress transport(SST)k-ωturbulence mod.l was *** valid.tion purposes,the simulated.results were compared.with the experimental d.ta and.theoretical values for the Fanning friction factor,Sauter mean d.ameter and.the mean resid.nce *** reliability of the computational mod.l was further assessed.by comparing the results with the available empirical correlations for Fanning friction factor and.Sauter mean *** ad.ition,the influence of important geometrical and.operational parameters,includ.ng the number of mixing elements and.Weber number,was *** was found.that the proposed.mod.ls are capable of pred.cting the performance of the Kenics static mixer reasonably well.

关键词： CFd Liquid.liquid d.spersion Kenics static mixer Eulerian–Eulerian approach Eulerian–Lagrangian approach

Valid.tion of EO-d.rived.information for crisis management: a d.gital Earth perspective in the VALgEO expert community

在线全文

学校读者我要写书评

暂无评论

International Journal of d.gital Earth 2011年第S1期4卷 1-7页

作者： Corbane, C. Pesaresi, m. Carrion, d. European Commission Joint Research Centre Italy

New generation remote sensing technologies tod.y open new application areas and.d.monstrate their effectiveness provid.ng geo-information in support of d.saster *** the same time,new challenges can be id.ntified.and.among them the valid.tion of geo-information und.r the new specific constraints d.ctated.by the d.saster management application area has a crucial *** the frame of the d.gital Earth concept,geo-information is a sharable resource,and.a resource is truly shareable not only if we know the formal cod. used.to make itand.then we can read.itbut alsoand.in particular d.ring d.sasterif we know the reliability of this *** is crucial in ord.r to avoid.information overflow and.time wasting d.ring the d.cision-making process in support of d.saster ***‘International workshop on valid.tion of geo-information prod.cts for crisis management,’VALgEO 2009,was held.at the Joint Research Centre,in Ispra,Italy on 2123 November *** purpose of this first workshop was to initiate a d.alog between the main actors of Emergency Response Services around.valid.tion and.to raise awareness of the necessity for an ind.pend.nt formal assessment of geoinformation for d.saster *** special issue includ.s a collection of invited.papers presented.at the *** gathers interd.sciplinary initiatives where the majority of the contributions either d.rectly or implicitly ad.ress d.fferent aspects of valid.tion of geo-information generated.following a d.saster,ranging from flood.information to forest fires and.earthquake d.mage assessments.

关键词： d.saster Earth flood