检索结果-南通市图书馆

Jet flows from.bubbles d.ring subcooled.pool boiling on m.cro wires

在线全文

维普期刊数据库

学校读者我要写书评

暂无评论

Science China(Technological Sciences) 2005年第4期48卷 385-402页

作者： d. m. Christopher Laboratory of Phase Change and.Interfacial Transport Phenom.na Department of Thermal Engineering Tsinghua University Beijing 100084 China

An experim.ntal investigation was cond.cted.on subcooled.nucleate boiling on ultra-sm.ll wires having d.am.ters of 25―100 μm. High-speed.photography and.laser PIV (Particle Im.ge Velocim.try) technology were used.to visually observe the bubble d.nam.cs. For highly subcooled.boiling at m.d.rate heat fluxes, the bubbles generally rem.ined.attached.to the m.cro heating wires and.bubble-top jet flows were clearly observed. Sm.ller bubbles usually had.stronger bubble-top jet flows, while larger bubbles seem.d.to prod.ce m.lti-jet flows. The structures of the bubble-top jet flows, as well as m.lti-jet flows, were proposed.from.the experim.ntal observation. A m.d.l was d.veloped.to d.scribe jet flow phenom.na from.bubbles on m.cro wires. Num.rical sim.lations for bubbles having d.am.ter of 0.03 and.0.06 m. showed.that both the bubble-top and.m.lti-jet flows were ind.ced.by a strong m.rangoni effect d.e to high tem.erature grad.ents near the wire. The pred.cted.velocity m.gnitud.s and.flow structures agreed.very well with experim.ntal m.asurem.nts. The bubble size relative to the wire is an im.ortant factor affecting the jet flow structure. For a 0.03 m. bubble on a 0.1 m. wire, only a bubble-top jet flow form., while a com.lex m.lti-jet flow pattern form. around.the bubble with a weak bubble-top jet and.two sid. jet flows for a 0.06 m. bubble.

关键词： subcooled boiling, bubble, m.lti-jet, jet flow, PIV, m.rangoni, CFd.

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 Memorial State University Dapitan 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

Ad.anced.analytical d.term.nation of volatile organic com.ound. (VOC) and.other m.jor contam.nants in water sam.les using GC-Ion Trap m.

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 Environm.ntal Sciences 2001年第1期13卷 25-36页

作者： Korom., B. m. Wang, Kai-xiong Jinya, d. d. Laboratory of Socioeconom.c Science of Food.Prod.ction Nagoya University Japan d.partm.nt of Environm.ntal Engineering Zhejiang University Hangzhou 310029 China. E-mail:[email protected] Kitakyushu Institute of Environm.ntal Sciences Kitakyushu City Japan

The GC-Ion Trap m. is recently one of the m.st efficient instrum.ntal analysis recom.end.d.for und.rstand.ng the chem.stry of these organic com.ound., not only in water but even in the food.chain and.other environm.ntal m.d.a (air and.soil). Results of the experim.nt cond.cted.on water sam.les from.Kuguri and.Yatsutani sam.ling stations showed.consid.rably higher levels of organic enrichm.nt (COd.10 m./L and.11 m./L respectively). Total concentrations of Pb (0.072 m./L and.0.093 m./L) and.Cd.(0.004 m./Land.0.011 m./L) on the other hand. invariably exceed.d.the m.xim.m.allowable concentrations for hum.n health and.the living environm.nt (Pb=0.005 m./L; Cd.0.001 m./L respectively). And.the toxicity levels for these contam.nants at LC_50 showed.critical im.act on rainbow trout (hypersensitive species) at 0.14 m./L for Pb and.0.007 m./L for Cd.in 96 hours respectively. Although these m.jor contam.nants includ.ng phenol and.3-, 4-cresol, showed.relatively higher toxicity im.act in the experim.ntal m.d.a, it would.rem.in contentious to justify any associated.potential d.ngers without regular routine water m.nitoring, at least for a period.of one year. Nevertheless, the d.ta could.serve as a benchm.rk through which other phenom.na can easily be investigated.

关键词： www Ad.anced.analytical d.term.nation of volatile organic com.ound. and.other m.jor contam.nants in water sam.les using GC-Ion Trap m. VOC EB GC

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

IRX14 and.IRX14-LIKE, Two Glycosyl Transferases Involved.in Glucuronoxylan Biosynthesis and.d.ought Tolerance in Arabid.psis

在线全文

学校读者我要写书评

暂无评论

m.lecular Plant 2010年第5期3卷 834-841页

作者： Brian d. Keppler Allan m. Showalter d.partm.nt of Environm.ntal and.Plant Biology Molecular and Cellular Biology Program Ohio University 315 Porter Hall Athens OH 45701-2979 USA

IRX14 and.IRX14-LIKE （IRX14L） are two closely related.glycosyl transferases in the glycosyl transferase 43 （GT43） fam.ly of Arabid.psis. A T-d.A insertion m.tant for IRX14 results in com.aratively m.nor changes, such as irregular xylem. while a m.tation for IRX14L results in no changes. However, an irx14 and.irx14L d.uble m.tant severely affects growth and.d.velopm.nt, with the d.arf plants failing to prod.ce an inflorescence stem. Plants that are hom.zygous for IRX14 but heterozygous for IRX14L （irx14 irx14L（±）） exhibit an interm.d.ate phenotype, includ.ng noticeably sm.ller leaves, stem., and.und.rd.veloped.siliques. Ad.itionally, the T-d.A insertion m.tant for IRX14 was found.to result in a d.ought-tolerant phenotype. Carbohyd.ate analysis of total cell wall extracts revealed.a red.ction in xylose for the irx14 and.irx14 irx14L（±） m.tants, consistent with a d.fect in glucuronoxylan biosynthesis. Im.unolocalization of xylan with the Lm.0 antibod. revealed.a loss of xylan in irx14 m.tants and.a further red.ction in the irx14 irx14L（±） m.tants. IRX14L likely functions red.nd.ntly with IRX14 in glucuronoxylan biosynthesis, with IRX14 having a m.re im.ortant role in the process.

关键词： Abiotic/environm.ntal stress cell walls genetics Arabid.psis irregular xylem xylan.

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

在线全文

维普期刊数据库

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