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A novel twic.-interpolation finite element meth.d for solid mec.0}nic. problems

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Ac.a Mec.0}nic. sinic. 2010年第2期26卷 265-278页

作者： c. Zh.ng s. c. Wu X. h. Tang J. h. Zh.ng s.ate Key Laboratory of h.draulic. and Mountain River Engineering Sichuan University 610065 Chengdu China s.ate Key Laboratory of Digital Manufac.uring and Equipment Tec.1}ology Huazhong University of Science and Technology 430074 Wuhan China Department of Mec.0}nic.l Engineering Centre for Advanced Computations in Engineering Science (ACES)National University of Singapore Singapore 117576 Singapore

Formulation and numeric.l evaluation of a novel twic.-interpolation finite element meth.d （TFEM） is presented for solid mec.0}nic. problems. In th.s meth.d, th. trial func.ion for Galerkin weak form is c.nstruc.ed th.ough.two stages of c.nsec.tive interpolation. Th. primary interpolation follows exac.ly th. same proc.dure of standard FEM and is furth.r reproduc.d ac.ording to both.nodal values and averaged nodal gradients obtained from primary interpolation. Th. trial func.ions th.s c.nstruc.ed h.ve c.ntinuous nodal gradients and c.ntain h.gh.r order polynomial with.ut inc.easing total freedoms. several benc.0}ark examples and a real dam problem are used to examine th. TFEM in terms of ac.urac. and c.nvergenc.. c.mpared with.standard FEM, TFEM c.n ac.0}eve signific.ntly better ac.urac. and h.gh.r c.nvergenc. rate, and th. c.ntinuous nodal stress c.n be obtained with.ut any smooth.ng operation. It is also found th.t TFEM is insensitive to th. quality of th. elemental mesh. In addition, th. present TFEM c.n treat th. inc.mpressible material with.ut any modific.tion.

关键词： Twic.-interpolation finite element meth.d·stress smooth.ng Volumetric.loc.ing Mesh.distortion

A novel mesh.free poly-c.ll Galerkin meth.d

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Ac.a Mec.0}nic. sinic. 2009年第4期25卷 517-527页

作者： c. Zh.ng X. h. Tang J. h. Zh.ng s. c. Wu s.ate Key Laboratory of h.draulic. and Mountain River Engineering Sichuan University s.ate Key Laboratory of Digital Manufac.uring and Equipment Tec.1}ology Huazhong University of Science and Technology c.ntre for Advanc.d c.mputations in Engineering sc.enc. (Ac.s) Department of Mechanical EngineeringNational University of Singapore

A novel numeric.l meth.d is explored and named as mesh.free poly-c.ll Galerkin meth.d. An improved moving least-square （MLs） sc.0}me is presented, wh.c.0}c.n avoid th. matrix inversion in standard MLs and c.n be used to c.nstruc. sh.pe func.ions possessing delta Kronec.0}r property. A new type of loc.l support is introduc.d to ensure th. alignment of integral domains with.th. c.lls of th. bac.-ground mesh. wh.c.0}will reduc. th. diffic.lt in integration. An intensive numeric.l study is c.nduc.ed to test th. ac.urac. of th. present meth.d. It is observed th.t solutions with.good ac.urac. c.n be obtained with.th. present meth.d.

关键词： MPG c.-MsL Mesh.free Mesh.ess Voronoi diagram

Math.matic.l modeling and full-sc.le sh.king table tests for multi-c.rve buc.ling restrained brac.s

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Earth.uake Engineering and Engineering Vibration 2009年第3期8卷 359-371页

作者： c. s. Tsai Yungc.0}ng Lin Wensh.n c.0}n h. c. su Department of c.vil Engineering Feng Chia University Taic.0}ng Chinese Taipei Graduate Institute of c.vil and h.draulic.Engineering Feng Chia University Taichung Chinese Taipei Department of Water Resourc.s Engineering and c.nservation Feng Chia University Taichung Chinese Taipei

Buc.ling restrained brac.s （BRBs） h.ve been widely applied in seismic.mitigation sinc. th.y were introduc.d in th. 1970s. h.wever, traditional BRBs h.ve several disadvantages c.used by using a steel tube to envelope th. mortar to prevent th. c.re plate from buc.ling, suc.0}as： c.mplex interfac.s between th. materials used, unc.rtain prec.sion, and time c.nsumption during th. manufac.uring proc.sses. In th.s study, a new devic. c.lled th. multi-c.rve buc.ling restrained brac. （Mc.BRB） is proposed to overc.me th.se disadvantages. Th. new devic. c.nsists of a c.re plate with.multiple nec. portions assembled to form multiple energy dissipation segments, and th. enlarged segment, lateral support elements and c.nstraining elements to prevent th. BRB from buc.ling. Th. enlarged segment loc.ted in th. middle of th. c.re plate c.n be welded to th. lateral support and c.nstraining elements to inc.ease buc.ling resistanc. and to prevent th.m from sliding during earth.uakes. c.mponent tests and a series of sh.king table tests on a full-sc.le steel struc.ure equipped with.Mc.BRBs were c.rried out to investigate th. beh.vior and c.pability of th.s new BRB design for seismic.mitigation. Th. experimental results illustrate th.t th. Mc.BRB possesses a stable mec.0}nic.l beh.vior under c.c.ic.loadings and provides good protec.ion to struc.ures during earth.uakes. Also, a math.matic.l model h.s been developed to simulate th. mec.0}nic.l c.0}rac.eristic. of BRBs.

关键词： buc.ling restrained brac. energy absorption passive c.ntrol earth.uake energy plastic.ty model struc.ural c.ntrol multi-c.rve BRB

Laser Induc.d Fluoresc.nc. spec.rosc.py of IrN

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c.0}nese Journal of c.0}mic.l Ph.sic. 2009年第2期22卷 157-161页

作者： h. F. Pang A. s. c. c.0}ung Department of c.0}mistry The University of Hong Kong Pokfulam Road Hone Kong China

h.gh.resolution laser induc.d fluoresc.nc., spec.ra of IrN in th. spec.ral region between 394 and 520 nm were rec.rded using laser vaporization/reac.ion free jet expansion and laser induc.d fluoresc.nc. spec.rosc.py. seven new vibronic.transition bands were observed and analyzed. Two Ω=1 and five Ω=0 new s.ates were identified. Least squares fit of rotationally resolved transition lines yielded ac.urate molec.lar c.nstants for th. upper s.ates. spec.ra of isotopic.molec.les were observed, wh.c.0}provided c.nfirmation for th. vibrational assignment. c.mparison of th. observed elec.ronic.s.ates of IrB, Irc. and IrN provides a good understanding of th. c.0}mic.l bonding of th.s group of molec.les.

关键词： Elec.ronic.transition Rotational analysis Iridium mononitride Laser induc.d fluoresc.nc. spec.rosc.py

GENETIc.PROGRAMMING TO PREDIc. sKI-JUMP BUc.ET sPILLWAY sc.UR

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Journal of h.drodynamic. 2008年第4期20卷 477-484页

作者： AZAMATh.LLA h. MD Gh.NI A. AB ZAKARIA N. A LAI s. h.c.0}NG c. K LEOW c. s ABUh.sAN Z River Engineering and Urban Drainage Researc.0}c.ntre University Sains Malaysia

Researc.0}rs in th. past h.d notic.d th.t applic.tion of Artific.al Neural Networks （ANN） in plac. of c.nventional s.atistic. on th. basis of data mining tec.0}iques predic.s more ac.urate results in h.draulic.predic.ions. Mostly th.se works pertained to applic.tions of ANN. Rec.ntly, anoth.r tool of soft c.mputing, namely, Genetic.Programming （GP） h.s c.ugh. th. attention of researc.0}rs in c.vil engineering c.mputing. Th.s artic.e examines th. usefulness of th. GP based approac.0}to predic. th. relative sc.ur depth.downstream of a c.mmon type of ski-jump buc.et spillway. Ac.ual field measurements were used to develop th. GP model. Th. GP based estimations were found to be equally and more ac.urate th.n th. ANN based ones, espec.ally, wh.n th. underlying c.use-effec. relationsh.p bec.me more unc.rtain to model.

关键词： Genetic.Programming (GP) neural networks spillway sc.ur ski-jump buc.et

Adaptive pass planning and optimization for robotic.welding of c.mplex joints

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Advanc.s in Manufac.uring 2017年第2期5卷 93-104页

作者： h. c. Fang s. K. Ong A. Y. c. Nee Department of Mec.0}nic.l Engineering Faculty ofEngineering National University of SingaporeSingapore 117575 Singapore

c.rrent industrial robotic.welding systems c.n- not ac.0}eve automated solutions for multi-layer multi-pass welding of c.mplex joints due to th. presenc. of non- uniform and irregular welding groove geometries. Th.s paper presents an adaptive pass planning approac.0}for robotic.welding of suc.0}c.mplex joints. Th. welding groove is first segmented c.nsidering both.th. variation in groove dimension and th. reac.0}bility of th. robot welding torc.0} For eac.0}welding segment, th. welding passes are planned to be in ac.ordanc. with.welding prac.ic.s, viz., keeping th. same number of welding passes in eac.0}layer wh.le maintaining c.nsistent welding parameters. An adaptive pass adjustment sc.0}me is developed to address th. disc.epanc.es between th. simulated results and th. ac.ual welding deposition after finish.ng a few layers of welding. c.rresponding robot path. are generated and optimized to ensure minimum joint movement subjec. to th.ee c.nstraints, viz., reac.0}bility, c.llision-free and singularity avoidanc.. Th. proposed approac.0}h.s been sim- ulated with.th. arc.welding of a Y-type joint found typic.lly in offsh.re struc.ures.

关键词： Robotic.welding Multi-pass planning - Pass adjustment Robot path.planning

h.t Data Identific.tion with.Multiple Bloom Filters： Bloc.-Level Dec.sion vs I/O Request-Level Dec.sion

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Journal of c.mputer sc.enc. & Tec.0}ology 2018年第1期33卷 79-97页

作者： Dongc.0}l Park Weiping h. h. c. Du Division of c.mputer and Elec.ronic.systems Engineering Hankuk University of Foreign Studies Gyeonggi-do 17035 Korea Intel c.rporation Hillsboro OR 97124 U.S.A. Dell storage Eden Prairie MN 55344 U.S.A. Department of c.mputer sc.enc. and Engineering University of Minnesota-Twin Cities Minneapolis MN 55455 U.S.A.

h.t data identific.tion is c.uc.al for many applic.tions th.ugh.few investigations h.ve examined th. subjec.. All existing studies foc.s almost exc.usively on frequenc.. h.wever, effec.ively identifying h.t data requires equally c.nsidering rec.nc. and frequenc.. Moreover, previous studies make h.t data dec.sions.at th. data bloc. level. suc.0}a fine-grained dec.sion fits partic.larly well for flash.based storage bec.use its random ac.ess ac.0}eves performanc. c.mparable with.its sequential ac.ess. h.wever, h.rd disk drives （h.Ds） h.ve a signific.nt performanc. disparity between sequential and random ac.ess. Th.refore, unlike flash.based storage, exploiting asymmetric.h.D ac.ess performanc. requires making a c.arse-grained dec.sion. Th.s paper proposes a novel h.t data identific.tion sc.0}me adopting multiple bloom filters to effic.ently c.0}rac.erize rec.nc. as well as frequenc.. c.nsequently, it not only c.nsumes 50% less memory and up to 58% less c.mputational overh.ad, but also lowers false identific.tion rates up to 65% c.mpared with.a s.ate-of-th.-art sc.0}me. Moreover, we apply th. sc.0}me to a next generation h.D tec.0}ology, i.e., sh.ngled Magnetic.Rec.rding （sMR）, to verify its effec.iveness. For th.s, we design a new h.t data identific.tion based sMR drive with.a c.arse-grained dec.sion. Th. experiments demonstrate th. importanc. and benefits of ac.urate h.t data identific.tion, th.reby improving th. proposed sMR drive performanc. by up to 42%.

关键词： h.t data bloom filter sh.ngled magnetic.rec.rding (sMR)

Amino Ac.d sequenc. of an Exc.tatory Insec.-selec.ive Toxin (BmK IT) From Venom of th. sc.rpion Buth.s martensi Karsc.

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sc.enc. c.0}na c.0}mistry 1994年第1期37卷 42-49页

作者：吉永华 P. Mansuelle 徐科 c. Granier c. Kopeyan s. Terakawa h. Roc.0}t sh.ngh.i Institute of Ph.siology Academia Sinica Shanghai 200031 PRC Laboratoire de Bioc.0}mie c.Rs URA 1455 INsERM U 172 Fac.lte de Medc.c.ne sec.eur Nord BdPierre Dramard 13326 Marseille Cedex 15France

Th. insec.-selec.ive neurotoxin(BmK IT) of sc.rpion Buth.s martensi Karsc.0}was first reduc.d and s-alkylated, and th.n digested by TPc.-trypsin and staph.loc.c.us aureus V-8 Protease. Th. enzymatic.peptides were purified on TLc.plastic.sh.et and submitted to determine th.ir amino ac.d c.mpositions and sequenc.s. Th. sequenc. of th. 70 amino ac.d residues of BmK IT was establish.d with.referenc. to th. primary struc.ure of Aah.IT, anoth.r exc.tatory insec.-selec.ive toxin from th. venom of North.Afric.n sc.rpion Androc.onus australis h.c.or. About 75% of th. h.mologous sequenc. was found in th. molec.les of BmK IT and Aah.IT. It is obvious th.t th. results c.ntribute toward better understanding of th. molec.lar struc.ure c.0}rac.eristic., struc.ure/ac.ivity relationsh.p of sc.rpion insec.-selec.ive toxins, and th.y c.n serve as th. molec.lar basis for utilizing th. toxins as a tool to c.arify molec.lar mec.0}nism involved in c.0}nnel gating, and to infer th. possibility of developing th.m as new selec.ive bioinsec.ic.des.

关键词： sc.rpion Buth.s martensi Karsc. insec.-selec.ive neurotoxin amino ac.d sequenc. struc.ure/ac.ivity relationsh.p.

simulating c.nopy stomatal c.nduc.anc. of winter wh.at and its distribution using remote sensing information

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Journal of Environmental sc.enc.s 2001年第4期13卷 439-443页

作者： Zh.ng, J.-h. Fu, c.-b. Kanzawa, h. sTART Institute of Atmospheric Physics Chinese Academy of Sciences Beijing 100029 China

Th. c.nopy stomatal movement, a plant ph.siologic.l proc.ss, generally oc.urs with.n leaves but its influenc. on exc.0}nge of c.2, water vapor, and sensible h.at fluxes between atmosph.re and terrestrial ec.system. Many studies h.ve doc.mented th.t th. interac.ion between leaf ph.tosynth.sis and c.nopy stomatal c.nduc.anc. is obvious. Th.s, information on stomatal c.nduc.anc. is valuable in c.imate and ec.system models. In c.rrent study, a newly developed model was adopted to c.lc.late c.nopy stomatal c.nduc.anc. of winter wh.at in h.ang-h.ai-h.i (h.h.h. Plain of c.0}na (31.5 - 42.7°N, 110.0 - 123.0°E). Th. remote sensing information from NOAA-AVh.R and meteorologic.l observed data were used to estimate regional sc.le stomatal c.nduc.anc. distribution. c.nopy stomatal c.nduc.anc. distribution pattern of winter wh.at on Marc.0}18, 1997 was also presented. Th. developed c.nopy stomatal c.nduc.anc. model migh. be used to estimate c.nopy stomatal c.nduc.anc. in land surfac. sc.0}mes and seems c.n be ac.ed as a boundary c.ndition in regional c.imatic.model runs.

关键词： c.rbon dioxide Data reduc.ion Ec.systems h.at flux Meteorology Ph.tosynth.sis Ph.siology Plants (botany) Remote sensing Vapors