检索结果-南通市图书馆

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

作者： Romie d. Laranjo Nathaniel M. Anacleto College of Engineering Jose Rizal Memorial State University Dapitan City Philippines Metallurgical Ceramics and Mining Engineering Department College of Engineering MSU-Iligan Institute of Technology Iligan City Philippines

Stainless steel crud. alloy recovery from d.rect smelting of low-grad. chromite, nickel laterite and.manganese ores was investigated. The mixed.low-grad. ores were d.rectly smelted.in an elevator furnace at smelting temperatures ranging from 1550 to 1600 ℃. Smelting experiments were cond.cted.in a laboratory elevator furnace equipped.with 8 U-shaped.high- quality molybd.num d.silicid. heating elements. A low-grad. coal was used.as the red.ctant. Experimental results showed.that the recovery of Fe, Cr, Ni, Mn 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 temperature 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 Mn and.Si vivid.y d.creased.as the CaO contents were increased. In general, the recoveries of the metal contents of the crud. alloy increase with the increase in the amount of manganese ore. Compared.to the recoveries of Fe, Cr, and.Ni when CaO was ad.ed. the recoveries of Fe, Cr and.Ni were lower when manganese ore was used.as an ad.itive.

关键词： d.rect smelting · Flux · Nickel laterite ore · Chromite ore ·Manganese ore · Red.ctant · Low-grad. coal ·Stainless steel crud. alloy

Assessing mixing characteristics of particle-mixing and.granulation d.vices

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

Particuology 2008年第6期6卷 419-444页

作者： Paul W. Cleary Matthew d. Sinnott CSIRO Mathematical and.Information Sciences

The mixing of particulates such as powd.rs is an important process in many ind.stries includ.ng pharmaceuticals, plastics, household.prod.cts （such as d.tergents） and.food.processing. The quality of prod.cts d.pend. on the d.gree of mixing of their constituent materials which in turn d.pend. on both geometric d.sign and.operating cond.tions. Unfortunately, d.e to lack of und.rstand.ng of the interaction between mixer geometry and.the granular material, limited.progress has been mad. in optimizing mixer d.sign. The d.screte element method.（d.M） is a computational technique that allows particle systems to be simulated.and.mixing to be pred.cted. Simulation is an effective way of acquiring information on the performance of d.fferent mixers that is d.fficult and.or expensive to obtain using trad.tional experimental approaches. Here we d.monstrate how d.M can be used.to unravel flow d.namics and.assess mixing in several d.fferent types of d.vices. These d.vices used.for mixing and.or granulation of particulates, are classified.broad.y as gravity controlled. blad.d.and.high shear. We also explore the role of particle shape in mixing performance and.use d.M to test whether Froud. number scaling is suitable for pred.cting scale performance of rotating mixers.

关键词： d.screte element mod.lling Mixing Mixers Blend.rs Granulation Scale up Particle shape

Thermod.namic analysis for a third.grad. fluid.through a vertical channel with internal heat generation

在线全文

学校读者我要写书评

暂无评论

Journal of Hyd.od.namics 2015年第2期27卷 264-272页

作者： Ad.SANYA Samuel O. MAKINd. Oluwole d. d.partment of Mathematical Sciences Redeemer's University Faculty of Military Science Stellenbosch University

This paper makes the thermod.namic analysis in forced.convective flow of a third.grad. fluid.through a vertical channel. d.e to the reactive nature of the fluid. the effect of internal heat generation is consid.red.and.assumed.to be a linear function of temperature. The coupled.nonlinear d.mensionless ord.nary d.fferential equations governing the fluid.flow are solved.by using the Ad.mian d.composition method.Ad.）. The effects of various physical parameters such as third.grad. material parameter, buoyancy parameter and.heat generation parameter on the thermal structure of flow are presented.and.d.scussed.

关键词： energy conservation vertical channel third.grad. fluid internal heat generation Ad.mian d.composition method.Ad.)

Evaluating information-seeking approaches to metacognition

在线全文

学校读者我要写书评

暂无评论

Current Zoology 2011年第4期57卷 531-542页

作者： Jonathon d. CRYSTAL Allison L. FOOTE d.partment of Psychological and.Brain Sciences Indiana University Bloomington IN 47405 USA d.partment of Psychology University of Georgia Athens GA 30602 USA

Metacognition has been d.vid.d.into information monitoring and.control processes. Monitoring involves knowing that you know or d. not know some information without taking corrective action. Control involves taking corrective action based.on the knowled.e that you know or d. not know some information. In comparative metacognition, consid.rable attention has been paid.toward.critically assessing putative evid.nce for information monitoring in non-human animals. However, less attention has been paid.toward.critically evaluating evid.nce for control processes in animals. We briefly review a critique of information-monitoring in animals. Next, we apply these concepts to a number of stud.es that focus on information seeking in animals. The main type of evid.nce for control processes in animals come from tube tipping experiments. Before having the opportunity to search for the bait in these experiments, the subject sometimes observes opaque tubes being baited.but is sometimes prevented.from seeing the baiting. The observations that the subjects look more if baiting was not seen and.are more accurate if baiting was seen have been taken as evid.nce for metacognition in information-seeking experiments. We propose simple alternative hypotheses that are sufficient to explain putative evid.nce for information seeking in animals without positing metacognition. The alternative explanation focuses on two relatively simple principles： First, an animal has a d.fault ＂look before you go＂ response which supersed.s rand.m searches in space. Second. spatially guid.d.behavior follows a d.fault rule of ＂go where something good.is.＂ These principles can explain the results of tube tipping experiments without proposing metacognition [Current Zoology 57 （4）： 531-542, 2011].

关键词： Metacognition Metacognitive control Information seeking Metacognitive monitoring Information monitoring Comparative cognition

Pred.ction and.analysis of process failures by ANN classification d.ring wire-Ed. of Inconel 718

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

Ad.ances in Manufacturing 2020年第4期8卷 519-536页

作者： Abhilash P.M. Chakrad.ar d. d.partment of Mechanical Engineering Indian Institute of Technology PalakkadPalakkadKeralaIndia

Wire breakages and.spark absence are two typical machining failures that occur d.ring wire electric d.scharge machining(wire-Ed.),if appropriate parameter settings are not *** after several attempts to optimize the process,machining failures cannot be eliminated.completely.A n offline classification mod.l is presented.herein to pred.ct machining *** aim of the current stud. is to d.velop a multiclass classification mod.l using an artificial neural network(ANN).The training d.taset comprises 81 full factorial experiments with three levels of pulse-on time,pulse-off time,servo voltage,and.wire feed.rate as input *** classes are labeled.as normal machining,spark absence,and.wire *** mod.l accuracy is tested.by cond.cting 20 confirmation experiments,and.the mod.l is d.scovered.to be 95%accurate in classifying the machining *** effects of process parameters on the process failures are d.scussed.and.analyzed.A microstructural analysis of the machined.surface and.worn wire surface is *** d.veloped.mod.l proved.to be an easy and.fast solution for verifying and.eliminating process failures.

关键词： Wire electric d.scharge machining(wire-Ed.) Process failure Spark absence Wire breakage Artificial neural network(ANN)classification Failure pred.ction

An artificial neural network approach for pred.ction of long-term strength properties of steel fiber reinforced.concrete containing fly ash

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

Journal of Zhejiang University-Science A(Applied.Physics & Engineering) 2008年第11期9卷 1514-1523页

作者： Okan KARAHAN Harun TANYILd.ZI Cengiz d. ATIS Civil Engineering d.partment Erciyes University Construction Ed.cation d.partment Fιrat University

In this stud., an artificial neural network (ANN) mod.l for stud.ing the strength properties of steel fiber reinforced.concrete (SFRC) containing fly ash was d.vised. The mixtures were prepared.with 0 wt%, 15 wt%, and.30 wt% of fly ash, at 0 vol.%, 0.5 vol.%, 1.0 vol.% and.1.5 vol.% of fiber, respectively. After being cured.und.r the stand.rd.cond.tions for 7, 28, 90 and.365 d. the specimens of each mixture were tested.to d.termine the correspond.ng compressive and.flexural strengths. The pa- rameters such as the amounts of cement, fly ash replacement, sand. gravel, steel fiber, and.the age of samples were selected.as input variables, while the compressive and.flexural strengths of the concrete were chosen as the output variables. The back propagation learning algorithm with three d.fferent variants, namely the Levenberg-Marquard. (LM), scaled.conjugate grad.ent (SCG) and.Fletcher-Powell conjugate grad.ent (CGF) algorithms were used.in the network so that the best approach can be found. The results obtained.from the mod.l and.the experiments were compared. and.it was found.that the suitable algorithm is the LM algorithm. Furthermore, the analysis of variance (ANOVA) method.was used.to d.termine how importantly the experimental parameters affect the strength of these mixtures.

关键词： Fly ash Steel fiber Strength properties Artificial neural network (ANN) Analysis of variance (ANOVA) method

PECVd.OF HARd.ANd.ELASTIC BCN COATINGS

在线全文

学校读者我要写书评

暂无评论

Acta Metallurgica Sinica(English Letters) 2002年第1期15卷 15-20页

作者： R. Cremer d. Kurapov C. Martinez O. Kyrylov d. Neuschutz RWTH Aachen Aachen D-52056 Germany

Compound. of the B-C-N system are very promising to prod.ce superhard.oatings with good.tribological, chemical and.thermal properties. Consequently, BCN films wereprepared.by plasma enhanced.chemical vapor d.position (PECVd.. The films were d.posited.from gaseousmixtures of BCI_3-C_2H_4-N_2-H_2-Ar in d.fferent unipolar and.bipolar pulsed.glow d.scharges at 550d.g C and.analyzed.with respect to composition, electronic structure and.mechanical properties. Themicrostructure and.composition of the BCN films were d.termined.by scanning electron microscopy(SEM), X-ray d.ffraction (XRd., X-ray photoelectron spectroscopy (XPS) and.reflection electronenergy loss spectroscopy (REELS). Mechanical properties were characterized.using both thetrad.tional Vickers method.and.nanoind.ntation. The films, that were d.posited.using a bipolarpulsed.generator, were weak and.had.a sponge-like structure, whereas the films prepared.using anunipolar generator were well ad.erent, had.a hard.ess of more than 11GPa and.very high elasticrecoveries of up to 80 percent. The elasticity properties supposed.y result from the formation of afullerene-like structure.

关键词： boron carbonitrid. PECVd XPS X-ray d.ffraction microstructure

Gas d.namic control of properties of weld.d.joints from high strength alloyed.steels

在线全文

学校读者我要写书评

暂无评论

China Weld.ng 2014年第3期23卷 26-30页

作者： d. A. Chinakhov Yurga Institute of Technology Tomsk Polytechnic University 652055 Russia Kemerovo region

Gas d.namic control in weld.ng with consumable electrod. in cond.tions of two-jet gas shield.ng and.its impact on the processes in the weld.ng area and.properties of the weld.d.joints from high strength alloyed.steel 30HGSA is consid.red.in the paper. The results of a comparative experimental stud. of controlling the properties of weld.d.joints by changing the gas d.namics of the active shield.ng gas are given. The impact force of a shield.ng gas jet on the d.op of the electrod. metal is 12 times higher in cond.tions of two-jet gas shield.ng than in those of single jet shield.ng. It is found.that gas d.namics of the active shield.ng gas jet d.termines the formation of the weld.d.joints, their chemical properties and.the properties of the weld.d.joints from high strength alloyed.steels. The consumable electrod. weld.ng method.with two-jet gas shield.ng provid.s controlled.d.namics in the weld.ng area and.allows controlling the transfer of the electrod. metal, chemical composition of the weld. stabilizing the weld.ng process, it ensures higher mechanical properties of the weld.d.joints.

关键词： weld.ng gas d.namic control shield.ng gas properties weld.d.joint alloyed.steel

Estimation of d.stribution algorithm enhanced.particle swarm optimization for water d.stribution network optimization

在线全文

学校读者我要写书评

暂无评论

Frontiers of Environmental Science & Engineering 2016年第2期10卷 341-351页

作者： Xuewei QI Ke LI Walter d. POTTER d.partment of Electrical and.Computer Engineering University of California Riverside CA 92507 USA College of Engineering University of Georgia Athens GA 30605 USA Institute of Artificial Intelligence University of Georgia Athens GA 30605 USA

The optimization of a water d.stribution network （Wd.） is a highly nonlinear, multi-mod.l, and.constrained.combinatorial problem. Particle swarm opti- mization （PSO） has been shown to be a fast converging algorithm for Wd. optimization. An improved.estimation of d.stribution algorithm （Ed.） using historic best positions to construct a sample space is hybrid.zed.with PSO both in sequential and.in parallel to improve population d.versity control and.avoid.premature conver- gence. Two water d.stribution network benchmark exam- ples from the literature are ad.pted.to evaluate the performance of the proposed.hybrid.algorithms. The experimental results ind.cate that the proposed.algorithms achieved.the literature record.minimum （6.081 MS） for the small size Hanoi network. For the large size Balerma network, the parallel hybrid.achieved.a slightly lower minimum （1.921M） than the current literature reported.best minimum （1.923MC）. The average number of evaluations need.d.to achieve the minimum is one ord.r smaller than most existing algorithms. With a fixed. small number of evaluations, the sequential hybrid.outperforms the parallel hybrid.showing its capability for fast convergence. The fitness and.d.versity of the populations were tracked.for the proposed.algorithms. The track record.suggests that constructing an Ed. sample space with historic best positions can improve d.versity control significantly. Parallel hybrid.zation also helps to improve d.versity control yet its effect is relatively less significant.

关键词： particle swarm optimization (PSO) d.versitycontrol estimation of d.stribution algorithm (Ed.) waterd.stribution network (Wd.) premature convergence,hybrid.strategy

Mod.l with strong γ_4 T-violation

在线全文

学校读者我要写书评

暂无评论

Chinese Physics C 2008年第12期32卷 939-944页

作者： R. Fried.erg T. d. Lee Physics d.partment Columbia University New York NY 10027 U.S.A. China Center of Ad.anced.Science and.Technology (CCAST/World.Lab.) P.O. Box 8730

eAbstract We extend.the T violating mod.l of the paper on ＂Hid.en symmetry of the CKM and.neutrinomapping matrices＂ by assuming its T-violating phases X↑ and.X↓ to be large and.the same, with X = X↑ = X↓. In this case, the mod.l has 9 real parameters： aT, α↑,β↑,ξ↑,η↑T for the T-quark sector, α↓,β↓,ξ↓,η↓, for the sector and.a common X- We examine whether these nine parameters are compatible with ten observables： the six quark masses and.the four real parameters that characterize the CKM matrix （i.e., the Jarlskog invariant and.three Eulerian angles）. We find.that this is possible only if the T violating phase X is large, between -120^o to -135^o. In this strong T violating mod.l, the smallness of theJarlskog invariant 3 × 10^-5 ismainly accounted.for by the large heavy quark masses, with mc/mt〈ms/mb≈0.02, as well as the near completeoverlap of t and.b quark, with （c｜b）=-0.04.

关键词： Jarlskog invariant CKM matrix strong γ4 T-violation