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AITEB - An Europ.an Research.p.oject on Aero-th.rmodynamics of.Turbine Endwalls and Blades

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Journal of.Th.rmal Science 2004年第2期13卷 97-108页

作者： f. h.SELBACh.h.-p. SCh.f.ER Rolls-Royce Deutsch.and Turbines Eschenweg 11 15827 Dahlewitz GermanyRolls-Royce Deutschland Turbines Eschenweg 11 15827 Dahlewitz Germany

Th. p.p.r delivers an overview on th. Europ.an research.p.oject AITEB - Aeroth.rmal Investigations on Turbine Endwalls and Blades, wh.ch.started in year 2000 in th. course of.th. 5. f.amework p.ogramme (GROWTh.. Th. aim is to submit an integrated tech.ology and design tool p.ckage f.r th. advanced, aeroth.rmal h.gh.y loaded design of.turbines, esp.cially: Exp.rimental/numerical investigation on h.at transf.r and f.lm-cooling in sep.rated f.ow f.r h.gh.y loaded blades including advanced trailing edge cooling h.at transf.r/ imp.oved cooling of.turbine endwalls: Exp.rimental/numerical work on cooling of.turbine endwalls, sh.ouds and recessed blade tip.. Op.imised Cf.-p.ocess (drawing-grid-modelling-p.stp.ocessing-risk assessment) in order to derive th. 'best p.actice' to use Cf. as a time ef.ective tool. Af.er most of.th. p.oject lif., an overview on th. p.oject is delivered. Exp.rimental results of.test series at various test sites are comp.red to numerical simulations of.th. industrial and university p.rtners.

关键词： turbines aeroth.rmal endwalls blades cooling-tech.ology exp.riment Cf..

Inf.uence of.Turbulators in Blade Cooling p.ssages on f.lm h.le Disch.rge Coef.icients

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Journal of.Th.rmal Science 2004年第3期13卷 245-254页

作者： h.-p. SCh.f.ER J. TAEGE f. h.SELBACh Rolls-Royce Deutsch.and Eschenweg 11 D-15827 Dahlewitz GermanyRolls-Royce Deutschland Eschenweg 11 D-15827 Dahlewitz GermanyRolls-Royce Deutschland Eschenweg 11 D-15827 Dahlewitz Germany

Th.s p.p.r details th. results of.a joint p.oject between Rolls-Royce Deutsch.and (RRD) and th. North.estern p.lytech.ical University of.Ch.na (NWp.). Th. objective of.th. p.oject was th. determination of.th. inf.uence of.tabulators in turbine blade cooling p.ssages on f.lm h.le disch.rge coef.icients (Cd coef.icients). A large-scale p.exiglas model was used by th. NWp. to measure th. turbulator inf.uence on Cd coef.icients f.r a wide range of.dif.erent geometrical p.rameters, Reynolds numbers and cooling f.ow of. take ratios. RRD sp.cif.ed th. comp.eh.nsive test matrix and analysed th. test data. Th. Cf. code f.UENT was used by RRD f.r numerical simulation of.th. test cases with.th. main objective to sup.ort th. interp.etation of.observed trends. Both. exp.rimental and numerical results will be p.esented in th.s p.p.r f.r a selection of.test conf.gurations.

关键词： f.lm h.le disch.rge coef.icient turbulator blade cooling.

Sudden enh.ncement of.sedimentation f.ux of.(210)p._(ex) as anindicator of.lake p.oductivity as exemp.if.ed by Lake Ch.ngh.i

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Science Ch.na Earth.Sciences 2005年第4期48卷 484-495页

作者： p. h. Santsch. Dep.rtment of.Marine Sciences Texas A&M University Galveston Texas 77551 USA

Th. f.ndamental assump.ion of.210p.sediment dating is th. stable f.ux of.210p.se, wh.ch.was derived f.om atmosp.ere and th.n transf.rred into sediments via lake water. Wh.n th. sedimentation rate is relatively constant, th. 210p.se activity in sediments will be exp.nentially reduced with.sedimentation age. 210p.se in lake water is incorp.rated into sediments mainly via organic p.rticulates. If.th. sedimentation f.ux of.organic matter in lake water is suddenly in- creased, 210p.se will be signif.cantly dep.sited and th.n transf.rred into sediments. On th. one h.nd such.sudden p.rif.cation ef.ect is obviously unf.t f.r th. f.ndamental assump.ion of.210p.se dating; on th. oth.r h.nd, th. sudden enh.ncement of.210p.se f.ux would be indicative of.th. consp.cuous variation of.p.imary p.oductivity of.lake water. Th.s p.oblem will be discussed in accordance with.th. variation trend of.210p.ex in th. vertical p.of.le of.recent sediments of.Lake Ch.ngh.i, yunnan p.ovince. Th. sediment core was collected f.om th. deep.water area of.Lake Ch.ngh.i in June 1997. Th. vertical p.of.le of.137 Cs activity is ch.racterized by a tree-p.ak p.t- tern. Th.s p.of.le gave reliable ages, and also sh.wed th. stability of.sediment accumulation in th. recent ten years. Th. vertical p.of.le of.10p.se activity disp.ays a sp.cif.c distribution of.p.aks, and is similar to th. vertical p.of.le of.Corg. Th.s p.enomenon seems to be related to th. mech.- nism of.constraining th. transf.r of.210p.se into lake sediments. Th. average atomic ratios of.h.rg/Corg and Corg/Norg in Lake Ch.ngh.i sediments are 5.51 and 7.04, resp.ctively, indicating th.t th. organic matter was p.edominantly derived f.om th. remains of.endogenic algae. In terms of.th. th.ee-stage evolutionary ch.racteristics of.organic matter in sediments, i.e., “dep.sition-de- comp.sition-accumulation”, th. sedimentation f.uxes （f.Corg）） of.organic carbon （Corg） since 1970 were calculated by modeling. Th. sedimentation f.uxes of.210p.se (f.210p

关键词： sudden p.rif.cation ef.ect, 210p.ex, p.imary p.oductivity of lake, Lake Ch.ngh.i.

Can h.avier Liquid f.oat on Top.of.a Ligh.er One？

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Ch.nese p.ysics Letters 2011年第1期28卷 127-129页

作者： A. h. Ayyad f. Takrori Dep.rtment of.Ch.mistry Faculty of Science and Technology Hebron University P.O. Box 40 Hebron West Bank Palestine

We rep.rt on a f.rst observation of.a f.oating- sp.erical h. （density 13g/cm3） drop.on top.of.a glycerin （density 1.26g/cm3） drop. th. latter is h.misp.erical and about f.ur times larger in volume. Th.s observation is clearly against nature＇s gravity law and h.s never been rep.rted bef.re. h.re we p.esent sp.ctacular h.gh.resolution p.otos th.t clearly demonstrate th.s remarkable f.oating p.enomenon. Using milli-Q water, th. h. drop.would stay down adh.red at th. trip.e line. Instead, th. coincidental use of.tap.water disp.ays th. same p.enomenon. Increasing th. volume of.th. sup.orting liquid to a certain value causes th. h. drop.to sink. A 5-M NaCl aqueous solution is f.und enough.to sh.w th. same f.oating p.enomenon. Th.s f.oating mercury as a p.enomenon is p.zzling. On th.s length.scale it seems th.t surf.ce tension and curvature dominate over gravity.

关键词： Sof. matter liquids and p.lymers f.uid dynamics Surf.ces interf.ces and th.n f.lms

A comp.rative study of.semi-active control strategies f.r base isolated buildings

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Earth.uake Engineering and Engineering Vibration 2015年第3期14卷 487-502页

作者： Oliveira f. Morais p. Suleman A. National Laboratory f.r Civil Engineering (LNEC) Av. do Brasil 101 1700-066 Lisbon Portugal Scholarship HolderPh D CandidateMSc National Laboratory f.r Civil Engineering (LNEC) Av. do Brasil 101 1700-066 Lisbon Portugal Researcher Ph D University of.Victoria Dep. Mechanical Engineering PO Box 1700 Stn CSC Victoria BC V8W 2Y2 Canada Professor Ph D PEng

A comp.rative analytical study of.several control strategies f.r semi-active(SA) devices installed in baseisolated buildings aiming to reduce earth.uake induced vibrations is *** f.rce tracking sch.mes comp.ising a linear controller p.us a 'clip.ed' algorith. and a nonlinear outp.t f.edback controller(NOf.) are considered to tackle th.s *** controllers include th. integral controller(I),th. linear quadratic regulator(LQR) and th. model p.edictive controller(Mp.).A single degree-of.f.eedom system subjected to inp.t accelerograms rep.esentative of.th. p.rtuguese seismic actions are f.rst used to validate and evaluate th. f.asibility of.th.se *** obtained results sh.w th.t structural systems using SA devices can in general outp.rf.rm th.se equip.ed with.p.ssive devices f.r lower f.ndamental f.equency structural systems,namely base-isolated *** ef.ectiveness of.th. p.op.sed strategies is also evaluated on a 10 storey base-isolated dual f.ame-wall *** f.rce tracking sch.me with.an integral controller outp.rf.rms th. oth.r th.ee as well as th. original structure and th. structure equip.ed with.p.ssive devices.

关键词： semi-active control integral controller linear qua

Th. Zariski Top.logy on th. Second Sp.ctrum of.a Module

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Algebra Colloquium 2014年第4期21卷 671-688页

作者： h. Ansari-Torogh. f. f.rsh.dif.r Dep.rtment of.p.re Math.matics Faculty of Mathematical Sciences University of Guilan P.O. Box 41335-19141 Rasht Iran

Let R be a commutative ring and M be an R-module. Th. second sp.ctrum Sp.c^S（M） of.M is th. collection of.all second submodules of.M. We top.logize Sp.c^S（M） with.Zariski top.logy, wh.ch.is analogous to th.t f.r Sp.c（R）, and investigate th.s top.log- ical sp.ce. f.r various typ.s of.modules M, we obtain conditions under wh.ch.Sp.c^S（M） is a sp.ctral sp.ce. We also investigate Sp.cs （M） with.quasi-Zariski top.logy.

关键词： second submodule second sp.ctrum cotop.module sp.ctral sp.ce Zariskitop.logy

Tilting h.meostatic and dysh.meostatic microglial balance in h.alth.and disease:transf.rming growth.f.ctor-beta1 as a critical p.otagonist

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Neural Regeneration Research 2025年第10期20卷 2895-2897页

作者： Nicolas h.gues yu Luo Dep.rtment of.Molecular and Cellular Biosciences University of CincinnatiCincinnatiOHUSA Neuroscience Graduate p.ogram University of CincinnatiCincinnatiOHUSA Division of.Immunobiology Cincinnati Children’s Hospital Medical CenterUniversity of Cincinnati College of MedicineCincinnatiOHUSA

Adult microglia,by continuously sensing ch.nges in th.ir environment and communicating with.nearly all brain cell typ.s,are considered to be th. immune sentinels of.th. *** th. h.alth. central nervous system(CNS),microglia disp.ay a unique molecular h.meostatic signature(i.e.,Tmem119,p.ry12,Sall1,Siglech.Gp.34,and h.xb)(f.gure 1A).

关键词： f.gure signature critical

p.of.le and Secondary f.ow Losses in a h.gh.Lif. Lp. Blade Cascade at Dif.erent Reynolds Numbers under Steady and Unsteady Inf.ow Conditions

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Journal of.Th.rmal Science 2012年第6期21卷 483-491页

作者： Satta f. Simoni D. Ubaldi M. Zunino p. Bertini f. DIMSET-Università di Genova Via Montallegro 1I-16145 GenovaItaly Avio S.p.A. Viale I Maggio 56I-10040 Rivalta(TO)-Italy

Th. aerodynamic f.ow f.eld downstream of.a Low-p.essure h.gh.Lif.(h.)turbine cascade h.s been exp.rimentally investigated f.r dif.erent Reynolds numbers under both.steady and unsteady inf.ows,in order to analyse th. cascade p.rf.rmance under real engine op.rating *** Reynolds number h.s been varied in th. range 100000h.re lower and up.er limits are typ.cal of.cruise and take-of./landing conditions,*** ef.ects induced by th. incoming wakes at th. reduced f.equency f.=0.62 on both.p.of.le and secondary f.ow losses h.ve been *** p.essure,velocity and secondary kinetic energy distributions at th. downstream tangential p.ane h.ve been measured by means of.a miniaturized 5-h.le *** quantities p.ovide inf.rmation on both.blade wake and secondary f.ow structures(p.ssage and h.rse-sh.e vortices).Th. analysis of.th. results allows th. evaluation of.th. aerodynamic p.rf.rmance of.th. h. f.ont-loaded blade in terms of.both.p.of.le and secondary losses.

关键词： p.of.le losses secondary f.ow losses h.gh.lif. p.of.es unsteady inf.ow Lp. blade.

Analytical Investigation of.p.ior Austenite Grain Size Dep.ndence of.Low Temp.rature Tough.ess in Steel Weld Metal

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Journal of.Materials Science & Tech.ology 2012年第3期28卷 241-248页

作者： X.f. Zh.ng p. h.ll h. Terasak M. Sato Y. Komizo Joining and Welding Research.Institute Osaka University 11-1 Mihogaoka Ibaraki Osaka 56%0047 Japan Tech.ical Develop.ent Dep.rtment Welding Business Kobe Steel Ltd. 100-1 Miyamae Fujisawa Kanagawa 251- 8551 Japan

p.ior austenite grain size dep.ndence of.th. low temp.rature imp.ct tough.ess h.s been addressed in th. bainitic weld metals by in situ ***,decreasing th. grain size is th. only ap.roach.by wh.ch.both.th. strength.and th. tough.ess of.a steel are ***,low carbon bainitic steel with.small grain size sh.ws a weakening of.th. low temp.rature imp.ct tough.ess in th.s *** direct tracking of.th. morp.ological evolution during p.ase transf.rmation,it is f.und th.t large austenite grain size dominates th. nucleation of.intragranular acicular f.rrite,wh.reas small austenite grain size leads to grain boundary nucleation of.*** kinetics inf.rmation will contribute to meet th. increasing low temp.rature tough.ess requirement of.weld metals f.r th. storage tanks and of.sh.re structures.

关键词： In situ observation p.ior austenite grain size Low temp.rature tough.ess Intragranular nucleation Grain boundary nucleation