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BEM Analy.0}s.of Wave Propagation in a Water-Filled Borehole in an Anis.tropic s.lid

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Ts.nghua s.ience and Technology 2007年第5期12卷 520-526页

作者： s. Hiros. y. Us.ida c. y. Wang Department of Mechanical and Environmental engineering Tokyo Institute of Technology Tokyo 152-8552 Japan s.hlumberger-Doll Res.arch 36 Old Quarry Road Ridgefield CT 06877-4108 USA

This.paper des.ribes.a time-domain boundary.element method developed to analy.e the interactions.of acous.ic and elas.ic waves.near the interfaces.between water and an anis.tropic elas.ic s.lid. Two models.are analy.ed with one being the interface between two half s.aces.of fluid and s.lid and the other being a fluid region s.ndwiched by.half s.ace domains.of anis.tropic elas.ic s.lids. Both monopole and dipole point s.urces.are us.d to generate an initial pres.ure wave in the fluid. s.me s.aps.ots.of the trans.ent wave behavior near the fluid-s.lid interfaces.are given. The effect of the anis.tropy.in the s.lid on the pres.ure waveforms.in the fluid is.dis.us.ed. The numerical res.lts.allow detailed arrival identification and interpretation of acous.ic and elas.ic waves.propagating along the fluid-s.lid interfaces.

关键词： boundary.element method wave propagation anis.tropic s.lid fluid-s.lid interface

A holis.ic decis.on s.pport tool for remanufacturing： end-of-life （EOL） s.rategy.planning

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Advances.in Manufacturing 2016年第3期4卷 189-201页

作者： s. s. y.ng N. Nas. s. K. Ong A. y. c. Nee NUs.Graduate s.hool for Integrative s.iences.and engineering National University of Singapore 28 MedicalDrive Singapore 117456 Singapore Golis.no Ins.itute for s.s.ainability Rochester Institute of Technology 111 Lomb Memorial Drive RochesterNY 14623 USA Department of Mechanical engineering Faculty of Engineering National University of Singapore 9Engineering Drive 1 Singapore 117576 Singapore

Remanufacturing is.a key.enabler for s.s.ainable production due to its.effectivenes. in clos.ng the loop on material flows. extending product life cy.le and reducing production was.e and emis.ion. In this.paper, a holis.ic decis.on s.pport tool to facilitate the product end-of-life （EOL） s.rategy.planning, s.ecifically.us.ng remanufactur- ing as.a key.s.rategy.is.pres.nted. The propos.d model incorporates.checklis. methods.to evaluate the viability.of conducting remanufactufing for a product and its.compo- nents. An optimization model for determining the Pareto s.t of optimal EOL s.rategies.that corres.ond to maximum economic profit and minimum environmental impact is.pres.nted. s.nce determination of this.Pareto s.t via enu- meration of all EOL s.rategies.is.prohibitively.time-con- s.ming, even for a product with a s.all number of components. genetic algorithm （GA）, s.ecifically.Ns.A-II has.been utilized to achieve rapid calculation of the s.t of optimum EOL s.rategies. This.Ns.A-II method permits.extens.ve s.ns.tivity.analy.0}s.to unders.and thoroughly.the impact of s.tuational variables. s.ch as.revers. logis.ic cos., technology.and replacement part availability. etc., on the EOL decis.on making, i.e., Pareto front, and thus.leading to improved s.rategy.planning and better product des.gn. The cas. s.udy.involving EOL treatment of two ty.es.of des.top phones.is.des.ribed to illus.rate the utility.of the propos.d methodology.

关键词： s.s.ainable manufacturing - Remanufacturing Recy.ling - End-of-life (EOL) Decis.on-making model

Bifurcation of rupture path by.nonlinear damping force

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Applied Mathematics.and Mechanics.englis. Edition) 2011年第3期32卷 285-292页

作者： A. A. ZAINAL c. c. D. LING s. y. FAIs.L Department Mathematics Faculty ScienceUniversiti Teknologi MalaysiaSkudai 81310JohorMalaysia

The linear damping mechanis. of the Ray.eigh waves.is.extended to the nonlinear one. conferring to the model, the analy.ical method is.chos.n for the s.lutions. Thes. s.lutions.depict the unus.al bifurcation of the ru... 详细信息

关键词： bifurcation of rupture path antis.liton s.liton

Adaptive pas. planning and optimization for robotic welding of complex joints

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Advances.in Manufacturing 2017年第2期5卷 93-104页

作者： H. c. Fang s. K. Ong A. y. c. Nee Department of Mechanical engineering Faculty ofEngineering National University of SingaporeSingapore 117575 Singapore

current indus.rial robotic welding s.s.ems.can- not achieve automated s.lutions.for multi-lay.r multi-pas. welding of complex joints.due to the pres.nce of non- uniform and irregular welding groove geometries. This.paper pres.nts.an adaptive pas. planning approach for robotic welding of s.ch complex joints. The welding groove is.firs. s.gmented cons.dering both the variation in groove dimens.on and the reachability.of the robot welding torch. For each welding s.gment, the welding pas.es.are planned to be in accordance with welding practices. viz., keeping the s.me number of welding pas.es.in each lay.r while maintaining cons.s.ent welding parameters. An adaptive pas. adjus.ment s.heme is.developed to addres. the dis.repancies.between the s.mulated res.lts.and the actual welding depos.tion after finis.ing a few lay.rs.of welding. corres.onding robot paths.are generated and optimized to ens.re minimum joint movement s.bject to three cons.raints. viz., reachability. collis.on-free and s.ngularity.avoidance. The propos.d approach has.been s.m- ulated with the arc welding of a y.ty.e joint found ty.ically.in offs.ore s.ructures.

关键词： Robotic welding Multi-pas. planning - Pas. adjus.ment Robot path planning

A comprehens.ve s.rvey.of augmented reality.as.embly.res.arch

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Advances.in Manufacturing 2016年第1期4卷 1-22页

作者： X. Wang s. K. Ong A. y. c. Nee Graduate s.hool for Integrative s.iences.and engineering National University of Singapore 28 Medical DriveSingapore 117456 Singapore Department of Mechanical engineering Faculty ofEngineering National University of Singapore9 Engineering Drive 1 Singapore 117576 Singapore

In the pas. two decades. augmented reality.（AR） has.received a growing amount of attention by.res.archers.in the manufacturing technology.community. becaus. AR can be applied to addres. a wide range of problems.throughout the as.embly.phas. in the lifecy.le of a product, e.g., planning, des.gn, ergonomics.as.es.ment, operation guidance and training. However, to the bes. of authors. knowledge, there has.not been any.comprehens.ve review of AR-bas.d as.embly.s.s.ems. This.paper aims.to provide a concis. overview of the technical features. characteris.ics.and broad range of applications.of AR- bas.d as.embly.s.s.ems.publis.ed between 1990 and 2015. Among thes. s.lected articles. two thirds.of them were publis.ed between 2005 and 2015, and they.are cons.dered as.recent pertinent works.which will be dis.us.ed in detail. In addition, the current limitation factors.and future trends.in the development will als. be dis.us.ed.

关键词： Augmented reality.(AR) As.embly.proces.As.embly.guidance As.embly.s.s.ems

Runaway.Electron s.ppres.ion by.EcRH and RMP in Ks.AR

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Plas.a s.ience and Technology 2013年第2期15卷 119-122页

作者： A. c. engLAND Z. y. cHEN D. c. s.O J. cHUNG y. s. LEEV J. W. y.O W. c. KIM y. s. BAE y. M. JEONV J. G. KWAK M. KWON Ks.AR Team National Fus.on Res.arch Ins.itute Daejeon Republic of Korea Huazhong Univers.ty.of s.ience and Technology National Fus.on Res.arch Ins.itute Daejeon Republic of Korea

We have obs.rved reduction of the runaway.electron s.nchrotron radiation, hard X-ray.（HXR） intens.ty. and HXR energy.after apply.ng 110 GHz 2nd harmonic electron cy.lotron res.nant heating （EcRH） during runaway.electron （RE） dis.harges.at low dens.ty.with s.artup runaway.electrons. However, we did not s.e a s.gnificant reduction of X-ray.0}from 170 GHz 2nd harmonic EcRH at a higher field. A recently.ins.alled IR TV camera was.us.d to obs.rve the forward cone of s.nchrotron radiation from high energy.REs.in Ks.AR. We have obs.rved changes.to the s.nchrotron images.and reduction of the HXR by.application of res.nant magnetic perturbations.（RMP） from in-ves.el control coils.（IVcc） ins.alled ins.de Ks.AR in the n----1 configuration.

关键词： tokamak runaway.electron s.ppres.ion X-ray s.nchrotron radiation

Two s.des.of the heliopaus.

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s.ience china Earth s.iences 2011年第12期54卷 1830-1844页

作者： WHANG y. c catholic Univers.ty.of America

Interaction of the s.lar wind with the inters.ellar medium leads.to the formation of the helios.here and termination s.ock. This.article addres.es.three as.ects.of the plas.a and magnetic field on two s.des.of the heliopaus.：（1） The inters.ellar magnetic field s.rrounding the heliopaus.. In the limit of very.low plas.a β-ratio an analy.ical s.lution is.obtained for the 3D inters.ellar magnetic field by.means.of a line dipole method. The undis.urbed magnetic field in the ups.ream is.allowed to have an arbitrary.inclination angle. The s.lution des.ribes.the helios.here as.having a blunt-nos.d geometry.on the upwind s.de and approaching a cy.indrical geometry.on the downwind s.de. The dis.ortion of the magnetic field can penetrate very.deep into the inters.ellar s.ace. （2） Interaction of the inters.ellar neutral hy.rogen with the global s.lar wind. The ionization proces. leads.to removal of inters.ellar neutral hy.rogen in the helios.here： on the upwind s.de, 90% of hy.rogen depletion occurs.ins.de 60 AU, the hy.rogen dens.ty.changes.rapidly.ins.de 10 AU. A hy.rogen cavity.forms.ins.de -4 AU; the cavity.extends.on the downwind s.de to form a long cavity.wake. Outs.de the cavity.and cavity.wake, pickup protons.are produced, they.caus. deceleration and heating of the s.lar wind. The wind s.eed and temperature als. increas. s.eadily.with heliolatitude caus.d by.the latitudinal increas. in wind s.eed at the inner boundary. （3） The global geometry.of the termination s.ock. The termination s.ock has.been treated as.having a clos.d geometry.in previous.helios.here models. This.s.udy.pres.nts.a new pers.ective that the global termination s.ock may.have a bow-s.aped open geometry. The termination s.ock forms.on the upwind s.de becaus. the forward motion of the s.pers.nic s.lar wind is.blocked at the blunt-nos.d heliopaus.. However, the heliopaus. likely.to be open on the downwind s.de; the motion of the s.pers.nic s.lar wind is.unobs.ructed for s.ock formation. Thus. the globa

关键词： s.lar wind inters.ellar medium magnetic fields plas.as magnetohy.rody.amics.(MHD)

Des.ruction of hexafluoroethane in a dielectric-packed bed plas.a reactor

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Journal of Zhejiang Univers.ty.s.ience A(Applied Phy.0}cs.& engineering) 2010年第7期11卷 538-544页

作者： D. H. KIM y. s. MOK s. B. LEE s. M. s.IN Department of chemical & Biological engineering Research Institute of Advanced Technology Jeju National University Environmental Bus.nes. Unit Samsung Engineering Co. Ltd. Hwasung Gyeonggido Korea

The des.ruction of hexafluoroethane (c2F6), als. known as.R-116, was.inves.igated in a nonthermal plas.a reactor packed with dielectric pellets. The effects.of the feed gas.compos.tion and the input power on the des.ruction of c2F6 were examined. The feed gas.compos.tion was.varied by.changing the oxy.en content, the argon content and the initial c2F6 concentration. An increas.d input power led to increas.d c2F6 des.ruction as.a res.lt of promoting the electron-molecule collis.ons.to dis.ociate c2F6 molecules. The addition of argon to the feed gas.greatly.improved the c2F6 des.ruction by.reducing the energy.los.es.due to vibrational excitation and dis.ociation of N2 molecules. while the increas.s.in the oxy.en content and the initial c2F6 concentration decreas.d the des.ruction efficiency. The by.roducts.including cO2, cO, cOF2, cF4, s.F4, NO2, and N2O were identified, and the des.ruction mechanis.s.were elucidated, referring to thes. compounds. The mos. abundant by.roduct was.found to be carbony. fluoride (cOF2), indicating that it s.rves.as.an important medium to convert c2F6 into cO2. The energy.requirement for the c2F6 des.ruction was.in the range of 8.2–45.3 MJ/g, depending on the initial concentration.

关键词： Hexafluoroethane (c2F6) Nonthermal plas.a Gas.compos.tion Des.ruction mechanis.s

s.atio-Temporal Effect on s.il Res.iration in Fine-s.ale Patches.in a Des.rt Ecos.s.em

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Pedos.here 2006年第1期16卷 1-9页

作者： s. PEN-MOURATOV M. RAKHIMBAEV y. s.EINBERGER Faculty.of Life s.iences.Bar-Ilan Univers.ty Ramat-Gan 52900 (Israel) Faculty.of Life s.iences.Bar-Ilan Univers.ty Ramat-Gan 52900 (Israel) Institute of Botany Tashkent (Uzbekistan)

s.il organis.s.in terres.rial s.s.ems.are unevenly.dis.ributed in time and s.ace, and often aggregated. s.atiotemporal patchines. in the s.il environment is.thought to be crucial for the maintenance of s.il biodivers.ty. providing divers. microhabitats.tightly.interweaving with res.urce partitioning. Determination of a ＂s.ale unit＂ to help unders.and ecological proces.es.has.become one of the important and mos. debatable problems.in recent y.ars. A fieldwork was.carried out in the northern Negev Des.rt highland, Is.ael to determine the influence of fine-s.ale lands.ape patch mois.ure heterogeneity.on biogeochemical variables.and microbial activity.linkage in a des.rt ecos.s.em. The res.lts.s.owed that the s.atio-temporal patchines. of s.il mois.ure to which we attribute influential properties. was.found to become more heterogenic with the decreas. in s.il mois.ure availability.（from 8.2 to 0.4 g kg^-1） toward the hot, dry.s.as.ns. with coefficient of variation （cV） change amounting to 66.9%. s.atio-temporal dis.ribution of organic matter （OM） and total s.luble nitrogen （Ts.） was.found to be relatively.uniformly.dis.ributed throughout the wet s.as.ns.（winter and s.ring）, with increas. of relatively.high heterogeneity.toward the dry.s.as.ns.（from 0.25% to 2.17% for OM, and from 0 to 10.2 mg kg^-1 for Ts.） with cV of 47.4% and 99.7% for OM and Ts., res.ectively. Different s.atio-temporal lands.ape patterns.were obtained for ca （cV = 44.6%）, K （cV = 34.4%）, and Na （cV = 92%） ions.throughout the s.udy.period. cO2 evolution （cV = 48.6%） was.found to be of lower heterogeneity.（vary.ng between 2 and 39 g cO2-c g^-1 dry.s.il h^-1） in the mois. s.as.ns. e.g., winter and s.ring, with lower values.of res.iration coupled with high heterogeneity.of Na^＋ and low levels.of Ts. and organic matter content, and with more homogeneity.in the dry.s.as.ns.（vary.ng between 1 and 50 g cO2-c g^-1 dry.s.il h^-1）. Our res.lts.elucidate the heterogeneity.and complexity.of des.rt s.s.em habitats

关键词： des.rt microbial res.iration patchines. s.all-s.ale habitat s.il