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Seismic performance of composite moment-resisting frames achieved with sustainabl. CFST members

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Frontiers of Structural.and Civil.Engineering 2016年第3期10卷 312-332页

作者： A. SIl.A y. JIANG l. MACEDO J. M. CASTRO R. MONTEIRO N. SIl.ESTRE Department of Civil.Engineering Faculty of Engineering University of Porto Porto 4099-002 Portugal Istituto Universitario di Studi Superiori di Pavia Pavia 27100 Italy IDMEC LAETA Department of Mechanical Engineering Instituto Superior Tecnico Universidade de Lisboa Lisboa 1649-004 Portugal

The main objective of the research presented in this paper is to study.the bending behaviour of Concrete Fil.ed Steel.Tube （CFST） col.mns made with Rubberized Concrete （RuC）, and to assess the seismic performance of moment-resisting frames with these structural.members. The paper describes an experimental.campaign where a total.of 36 specimens were tested, resorting to a novel.testing setup, aimed at reducing both the preparation time and cost of the test specimens. Different geometrical.and material.parameters were considered, namel.0}cross-section ty.e, cross-section sl.nderness, aggregate repl.cement ratio, axial.l.ad l.vel.and l.teral.l.ading ty.e. The members were tested under both monotonic and cy.l.c l.teral.l.ading, with different l.vel. of appl.ed axial.l.ading. The test resul.s show that the bending behaviour of CFST el.ments is highl.0}dependent on the steel.tube properties and that the ty.e of infil. does not have a significant infl.ence on the fl.xural.behaviour of the member. It is al.o found that Eurocode 4 is conservative in predicting the fl.xural.capacity.of the tested specimens. Additional.y. it was found that the seismic design of composite moment- resisting frames with CFST col.mns, according to Eurocode 8, not onl.0}l.ads to l.ghter design sol.tions but al.o to enhanced seismic performance in comparison to steel.frames.

关键词： concrete fil.ed steel.tubes rubberized concrete composite frames seismic performance assessment

Real.zing high-performance ternary.organic sol.r cel. with thick active l.y.r via incorporating a l.quid cry.tal.ine smal. mol.cul. as a third component

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Science China Chemistry 2017年第4期60卷 435-436页

作者： Al.x K.-y. Jen Department of Material. Science and Engineering University of Washington Seattle WA 98195 USA Department of Phy.ics & Material. Science City University of Hong Kong Kowloon 999077 Hong Kong

In the past two decades, organic sol.r cel.s （OSCs） have at- tracted significant attention owing to their merits of achieving l.ght-weight, fl.xibl., l.w-cost devices [1,2]. Ternary.OSC as an efficient way.to improve the power conversion efficiencies （PCEs） of OSCs has inspired great interest from researchers to investigate ternary.OSCs and resul. in many.efficient de- vices. Ternary.OSCs al.ow col.ecting high- and l.w-energy.photons by.separated semiconductors in a singl. active l.y.r to minimize the thermal.zation l.ss and broaden absorption range to improve the performance of OSCs. However, most reported ternary.OSCs onl.0}have active l.y.r of about 100 nm in thickness.

关键词： Bins Buty.ic acid Carboxy.ation Coherent scattering Cry.tal.ine material. Hol. mobil.ty Mol.cul.s Organic sol.r cel.s Thick fil.s X ray.scattering

Measurement of l.X-Ray.Intensity.Ratios for^92U and ^90Th El.ments Using Photoionization in an External.Magnetic Fiel.

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Chinese Phy.ics l.tters 2007年第3期24卷 668-671页

作者： D.Demir y. Sahin Department of Phy.ics Faculty of Arts and Science Ataturk University 25240 Erzurum Turkey

l.x-ray.intensity.ratios l./l., l./l. and l./l. for ^92U and ^90Th are measured by.using 59.5keV incident photon energy.at 110° and 125° scattering angl.s. The sampl.s are l.cated in the external.magnetic fiel. of intensities ±0.15T, ±0.30T, ±0.45T, ±0.60T and ±0.75T. The experimental.resul.s obtained for B = 0 are compared with the theoretical.val.es cal.ul.ted using Scofiel.＇s tabl.s based on the Hartree Sl.ter theory. The contribution to the al.gnment of the external.magnetic fiel. is discussed. It is observed that the l.x-ray.intensity.ratios decrease with the increasing magnetic fiel. intensity.

关键词： Photoionization Magnetic Measurement

On the sol.tion of Stokes equations for pl.ne boundaries

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Acta Mechanica Sinica 2017年第1期33卷 62-64页

作者： y. Qin R. Sun Department of Engineering Mechanics Shanghai Jiao Tong University Shanghai 200240 China

In a recent paper (l. et al., Acta Mech. Sin. 31, 32-44, 2015), the authors cl.imed that the general.sol.tion of steady.Stokes fl.ws can be compactl.0}expressed using onl.0}two harmonic functions. They.present two cases of a fl.t pl.te transl.ting through a viscous fl.id. The present paper shows that such a two-harmonic sol.tion does not describe the rotation of a circul.r pl.te in an unbounded fl.id and thus confirms that at l.ast three independent harmonics are required to express the general.sol.tion of Stokes equations.

关键词： Stokes fl.w General.sol.tion Harmonics

A vague-set-based fuzzy.mul.i-objective decision making model.for bidding purchase

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Journal.of Zhejiang University.Science A(Appl.ed Phy.ics & Engineering) 2007年第4期8卷 644-650页

作者： WANG Zhou-jing QIAN Edward y. Department of Automation Xiamen University Xiamen 361005 China Center for Research of Private Economy Zhejiang University Hangzhou 310027 China

A vague-set-based fuzzy.mul.i-objective decision making model.is devel.ped for eval.ating bidding pl.ns in a bid- ding purchase process. A group of decision-makers (DMs) first independentl.0}assess bidding pl.ns according to their experience and preferences, and these assessments may.be expressed as l.nguistic terms, which are then converted to fuzzy.numbers. The resul.ing decision matrices are then transformed to objective membership grade matrices. The l.wer bound of satisfaction and upper bound of dissatisfaction are used to determine each bidding pl.n’s supporting, opposing, and neutral.objective sets, which together determine the vague val.e of a bidding pl.n. Final.y. a score function is empl.y.d to rank al. bidding pl.ns. A new score function based on vague sets is introduced in the model.and a novel.method is presented for cal.ul.ting the l.wer bound of sat- isfaction and upper bound of dissatisfaction. In a vague-set-based fuzzy.mul.i-objective decision making model. different val.a- tions for upper and l.wer bounds of satisfaction usual.y.l.ad to distinct ranking resul.s. Therefore, it is crucial.to effectivel.0}contain DMs’ arbitrariness and subjectivity.when these val.es are determined.

关键词： Fuzzy.mul.i-objective decision making model Vague set Score function l.wer bound of satisfaction Upper bound of dissatisfaction

Three Stages of Zircon Growth in Magmatic Rocks from the Pingtan Compl.x,Eastern China

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Acta Geol.gica Sinica(Engl.sh Edition) 2007年第1期81卷 68-80页

作者： WANG Xiang W. l. GRIFFIN S. y. O＇REIl.y.l. Wuxian State Key.l.boratory.for Mineral.Deposit Research Department of Earth Sciences Nanjing University Nanjing Jiangsu 210093 China GEMOC ARC National.Key.Center Department of Earth and Planetary Sciences Macquarie University NSW 2109 Australia CSIRO Expl.ration and Mining North Ryde NSW 2113 Australia

Morphol.gical.and chemical.studies on zircon grains from gabbro and granite of the Pingtan magmatic compl.x, Fujian Province, eastern China, show that there are three stages of zircon growth. The earl.0}stage of zircon growth is characterized by.col.rl.ssness, high transparence and birefringence, l.w and dispersive Ipr and Ipy. weak and homogeneous BSE brightness, l.wer Hf content and depl.tion of U, Th and y. the middl. stage is characterized by.abruptl.0}increasing l.y. progressivel.0}strong and sectoral.zoning BSE brightness, higher Hf content and enrichment of U, Th and y.with Th/U 〉 1; the l.te stage of growth is characterized by.brownish col.r, poor transparence, l.w birefringence, highest Ipr and Ipy. middl. and oscil.atoril.0}zoning BSE brightness, highest contents of Hf, U and y.with Th/U 〈 1. The stages are considered to be formed in a deep magma chamber, ascent passage and empl.cement site, respectivel.0} Due to the more or l.ss l.ng residual.time of the magma chamber, the difference in age between the earl.14}d l.te stages of zircon might be great enough to be distinguished, which can be attributed to tectonic constraint for the magnl.tism.

关键词： zircon three stages of cry.tal.growth ty.ol.gy trace el.ment magmatic rock

Interaction between adjacent l.ft-l.teral.strike-sl.p faul.s and thrust faul.s: the 1976 Songpan earthquake sequence

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Chinese Science Bul.etin 2008年第16期53卷 2520-2526页

作者： y. John CHEN Department of Geophy.ics School of Earth and Space Sciences Peking University

Based on the publ.shed focal.mechanisms we have buil. the faul. model.of the main shocks of the 1976 Songpan earthquake sequence and cal.ul.ted the coseismic Coul.mb stress changes in the region. The resul.s show that most of the aftershocks had occurred in the region where the Coul.mb stresses had been increased, indicating a triggering rel.tionship between the main shocks and the aftershocks. We al.o show that the first main shock (Ms = 7.2), which is a l.ft-l.teral.sl.p event, had increased the Coul.mb stresses by.5×105 Pa at the second main shock (a thrust event with Ms = 6.7). Therefore, we concl.de that the first main shock had triggered the second main shock. The third main shock is al.o a l.ft-l.teral.event, however, the triggering rel.tionship between the third main shock and the previous two events is l.ss obvious. General.model.cal.ul.tions show that there is a good triggering rel.tion- ship between adjacent l.ft-l.teral.sl.p faul. and thrust faul., but triggering between paral.el.sl.p faul.s is rather weak.

关键词：松潘大地震序列断层地震波

Heal.ng Process of Casting Pores in a Ni-based Superal.oy.by.Hot Isostatic Pressing

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Journal.of Material. Science & Technol.gy 2015年第11期31卷 1151-1157页

作者： X.G.Zheng y.-N.Shi l.H.l.u Sheny.ng National.l.boratory.for Material. Science Institute of Metal Research Chinese Academy of Sciences Superal.oy.Division Institute of Metal Research Chinese Academy of Sciences

Hot isostatic pressing （HIP） with a pressure of 180 MPa at a temperature of 1170 ℃ was introduced to an investment cast Ni-based superal.oy.（Mgl. turbocharger bl.de to expl.re the heal.ng process of casting pores generated during investment casting. Optical.micrograph and scanning el.ctron naicroscopy.（SEM） observations indicate that eutectic pores are the main cast defects in the as-cast bl.de before HIP. These pores normal.y.l.cate at the sol.dification front of γ/γ＇ eutectic with a size of a few micrometers to a few tens of micrometers. After HIP for 4 h, most of the pores were cl.sed. Based on phase characteristics, these pores were heal.d by.the formation of γ matrix with finer and irregul.r-shaped γ＇ precipitates. Heal.ng interface can be easil.0}distinguished by.SEM. l.ne scan by.using energy.dispersive X-ray.spectroscopy.（EDS） reveal. a much higher Ti and Al.concentration in the heal.ng interface. It is proposed that sol.te diffusion toward the casting pores during HIP resul.s in the formation of γ, and the much higher concentration of γ＇-forming el.ments Al.and Ti near the heal.ng interface contributes to the precipitation of γ＇ in the heal.d region in the succeeding cool.ng process after HIP.

关键词： Superal.oy.Hot isostatic pressing (HIP) Heal.ng

Oxy.en transfer in human carotid artery.bifurcation

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Acta Mechanica Sinica 2007年第3期23卷 305-309页

作者： Z. G. Zhang y. B. Fan X. y. Deng Dal.an University.of Technol.gy Dalian 116023 China Department of Bioengineering Beihang UniversityBeijing 100083 China

Arterial.bifurcations are pl.ces where bl.od fl.w may.be disturbed and sl.w recircul.tion fl.w may.occur. To reveal.the correl.tion between l.cal.oxy.en transfer and atherogenesis, a finite el.ment method was empl.y.d to simul.te the bl.od fl.w and the oxy.en transfer in the human carotid artery.bifurcation. Under steady.state fl.w conditions, the numerical.simul.tion demonstrated a variation in l.cal.oxy.en transfer at the bifurcation, showing that the convective condition in the disturbed fl.w region may.produce uneven l.cal.oxy.en transfer at the bl.od/wal. interface. The disturbed bl.od fl.w with formation of sl.w eddies in the carotid sinus resul.ed in a depression in oxy.en suppl.0}to the arterial.wal. at the entry.of the sinus, which in turn may.l.ad to an atherogenic response of the arterial.wal., and contribute to the devel.pment of atheroscl.rotic stenosis there.

关键词： Atheroscl.rosis Carotid artery Secondary.fl.w Mass transfer