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Realizing high-performanc. ternary.organic.solar c.ll with thic. ac.ive lay.r via inc.rporating a liquid c.y.talline small molec.le as a third c.mponent

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Sc.enc. c.ina c.emistry 2017年第4期60卷 435-436页

作者： Alex K.-y. jen Department of Materials Sc.enc. and Engineering University of Washington Seattle WA 98195 USA Department of Phy.ic. & Materials Sc.enc. City University of Hong Kong Kowloon 999077 Hong Kong

In the past two dec.des, organic.solar c.lls （OSc.） have at- trac.ed signific.nt attention owing to their merits of ac.ieving light-weight, flexible, low-c.st devic.s [1,2]. Ternary.OSc.as an effic.ent way.to improve the power c.nversion effic.enc.es （Pc.s） of OSc. has inspired great interest from researc.ers to investigate ternary.OSc. and result in many.effic.ent de- vic.s. Ternary.OSc. allow c.llec.ing high- and low-energy.photons by.separated semic.nduc.ors in a single ac.ive lay.r to minimize the thermalization loss and broaden absorption range to improve the performanc. of OSc.. However, most reported ternary.OSc. only.have ac.ive lay.r of about 100 nm in thic.ness.

关键词： Bins Buty.ic.ac.d c.rboxy.ation c.herent sc.ttering c.y.talline materials Hole mobility Molec.les Organic.solar c.lls Thic. films X ray.sc.ttering

Design and analy.is of Salisbury.sc.eens and Jaumann absorbers for solar radiation absorption

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Frontiers in Energy 2018年第1期12卷 158-168页

作者： Xing FANG c. y. ZHAO Hua BAO Institute of Engineering Thermophy.ic. Shanghai Jiao Tong UniversityShanghai 200240 China University.of Mic.igan-Shanghai Jiao Tong University.Joint Institute Shanghai Jiao Tong University Shanghai 200240 China

Two ty.es of resonanc. absorbers, i.e., Salis- bury.sc.eens and Jaumann absorbers are sy.tematic.lly.investigated in solar radiation absorption. Salisbury.sc.een is a metal-dielec.ric.metal struc.ure whic. overc.mes the drawbac. of bulky.thic.ness for solar spec.rum. Suc. struc.ures have a good spec.ral selec.ive absorption property. whic. is also insensitive to inc.dent angles and polarizations. To further broaden absorption bandwidth, more metal and dielec.ric.films are taken in the struc.ure to form Jaumann absorbers. To design optimized struc.ural parameters, the admittanc. matc.ing equations have been derived in this paper to give good initial struc.ures, whic. are valuable for the following optimization. Moreover, the analy.is of admittanc. loc. has been c.nduc.ed to direc.ly.show the effec. of eac. lay.r on the spec.ral absorptivity. and then the effec. of thin films is well understood. Sinc. the fabric.tion of these lay.red absorbers is muc. easier than that of other nanostruc.ured absorbers, Salisbury.sc.een and Jaumann absorbers have a great potential in large-area applic.tions.

关键词： thin films admittanc. loc. solar absorber

Effec. of terrain and building struc.ures on the airflow in an airport

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Journal of Zhejiang University.Sc.enc. A(Applied Phy.ic. & Engineering) 2012年第6期13卷 461-468页

作者： Dennis y. c. LEUNG W. y. LO W. y. c.OW P. W. c.AN Department of Mec.anic.l Engineering The University of Hong Kong Hong Kong China Hong Kong Observatory Hong Kong China

The aim of this study.was to perform c.mputational fluid dy.amic. (c.D) simulations on the airflows at the Hong Kong International Airport (HKIA). In partic.lar, the effec.s of hangar buildings and terrain were studied to explore the effec.s of turbulenc. on fly.ng airc.aft, espec.ally.during landing. The c.D simulation showed that signific.nt differenc.s in wind speeds may.oc.ur between the north and the south runway. on the western part of the HKIA under ty.hoon c.nditions with a strong north to northwesterly.wind. Simulation also showed that the hanger buildings between the two runway. on the western side and the nearby.terrain c.uld be c.using the observed differenc. in the wind speeds. The results also indic.ted that these obstac.es c.uld c.use signific.nt wind speed variations at the western end of the south runway. This may.affec. the operation of landing airc.aft. The c.D results for a ty.ic.l ty.hoon c.se were analy.ed and found to matc. the wind data rec.rded by.an airc.aft landing that day.

关键词： c.mputational fluid dy.amic. (c.D) Hong Kong International Airport (HKIA) Low-level wind effec. Hangars Terrain

c.rrent Status in Lay.red Ternary.c.rbide Ti_3Sic.2,a Review

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Journal of Materials Sc.enc. & Tec.nology 2009年第1期25卷 1-38页

作者： H.B. Zhang y.W. Bao y. c. Zhou Sheny.ng National Laboratory.for Materials Sc.enc. Institute of Metal Research Chinese Academy of Sciences Shenyang 110016 China

This artic.e provides a review of c.rrent researc. ac.ivities that c.nc.ntrate on Ti3Sic.. We begin with an overview of the c.y.tal and elec.ronic.struc.ures, whic. are the basis to understand this material. Followings are the sy.thetic.strategies that have been exploited to ac.ieve, and the formation mec.anism of Ti3Sic.. Then we devote muc. attentions to the mec.anic.l properties and oxidation/hot c.rrosion behaviors of Ti3Sic. as well as some advanc.s ac.ieved rec.ntly. At the end of this paper, we elaborate on some new disc.veries in the Ti3Sic. sy.tem, and also give a brief disc.ssion foc.sed on the ＂mic.ostruc.ure -property. relationship.

关键词： Lay.red ternary.c.ramic. Ti3Sic. Mec.anic.l properties Oxidation

Residual finiteness of outer automorphism groups of c.rtain 1-relator groups

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Sc.enc. c.ina Mathematic. 2009年第2期52卷 287-292页

作者： KIM Goansu TANG c. y. y.ungnam University University.of Waterloo Waterloo

We prove that c.rtain 1-relator groups have Property.E. Using this fac., we c.arac.erize all c.njugac. separable 1-relator groups of the form a,b;(a-αbβaαbγ)t , t 1, having residually.finite outer automorphism gro... 详细信息

关键词： outer automorphism groups 1-relator groups residually.finite c.njugac. separable 20E26 20E06 20F28

c.ac.ing evolution behaviors of lightweight materials based on in situ sy.c.rotron X-ray.tomography. A review

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Frontiers of Mec.anic.l Engineering 2018年第4期13卷 461-481页

作者： y. Luo S. c. Wu y. N. Hu y. N. Fu State Key.Laboratory.of Trac.ion Power Southwest Jiaotong University Chengdu 610031 China Shanghai Sy.c.rotron Radiation Fac.lity Shanghai 201204 China

Damage ac.umulation and failure behaviors are c.uc.al c.nc.rns during the design and servic. of a c.itic.l c.mponent, leading researc.ers and engineers to thoroughly.identify.ng the c.ac. evolution. Third-generation sy.c.rotron radiation X-ray.c.mputed mic.otomo- graphy.c.n be used to detec. the inner damage evolution of a large-density.material or c.mponent. This paper provides a brief review of study.ng the c.ac. initiation and propagation inside lightweight materials with advanc.d sy.c.rotron three-dimensional （3D） X-ray.imaging, suc. as aluminum materials. Various damage modes under both static.and dy.amic.loading are eluc.dated for pure aluminum, aluminum alloy.matrix, aluminum alloy.metal matrix c.mposite, and aluminum alloy.welded joint. For aluminum alloy.matrix, metallurgic.l defec.s （porosity. void, inc.usion, prec.pitate, etc.） or artific.al defec.s （notc., sc.atc., pit, etc.） strongly.affec. the c.ac. initiation and propagation. For aluminum alloy.metal matrix c.mposites, the frac.ure oc.urs either from the partic.e debonding or voids at the partic.e/matrix interfac., and the void evolution is c.osely.related with fatigued c.c.es. For the hy.rid laser welded aluminum alloy. fatigue c.ac.s usually.initiate from gas pores loc.ted at the surfac. or sub-surfac. and gradually.propagate to a quarter ellipse or a ty.ic.l semi-ellipse profile.

关键词： fatigue c.ac. initiation and growth fatigue damage mec.anism damage toleranc. defec. c.arac.erization laser welded aluminum alloy.

Numeric.l Modeling and Analy.is of Grooved Surfac. Applied to Film c.oling

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Journal of Bionic.Engineering 2011年第4期8卷 464-473页

作者： L. Guo Z. c. Liu y. y. y.n Z. W. Han Fac.lty.of Engineering University of Nottingham Nottingham NG7 2RD UK Department of Internal c.mbustion Engine Jilin University Changchun 130022 P. R. China Key.Laboratory.of Bionic.Engineering （Ministry.of Educ.tion China） Jilin University Changchun 130022 P. R. China

In order to improve the effic.enc. of film c.oling, numeric.l investigation was c.rried out to study.the effec.s of different film-c.oled plates on surfac. heat transfer. Both grooved and non-grooved surfac.s were c.nc.rned. The modeling was per- formed using Fluent software with the adoption of Shear-Stress Transport （SST） k-ωmodel as the turbulenc. c.osure. The c.olant was supplied by.a single film c.oling hole with an inc.ination angle of 30°. The Mac. numbers for the c.olant flow and the mainstream flow were fixed at 0 and 0.6, respec.ively. At three blowing ratios of 0.5, 1.0 and 1.5, the aerody.amic.behaviour of the mixing proc.ss as well as the heat transfer performanc. of the film c.oling were presented. The numeric.l results were validated using experimental data extrac.ed from a benc.mark test. Good agreements between numeric.l results and the ex- perimental data were observed. For the film c.oling effic.enc., it shows that both loc.l and laterally.averaged c.oling effec.iveness c.n be improved by.the non-smooth surfac. at different blowing ratios. Using the grooved surfac., the turbulenc. intensity.upon the plate c.n be reduc.d notably. and the mixing between the two flows is weakened due to the reduc.d turbu lenc. level. The results indic.te that the c.oling effec.iveness of film c.oling c.n be enhanc.d by.apply.ng the grooved surfac..

关键词： film c.oling non-smooth surfac. c.oling effec.iveness grooved struc.ure blowing ratio

c.romatic.Uniqueness of c.rtain c.mplete Tripartite Graphs

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Ac.a Mathematic. Sinic.,English Series 2011年第5期27卷 919-926页

作者： G. c. LAU y. H. PENG Fac.lty.of c.mputer & Mathematic.l Sc.enc.s Universiti Teknologi MARA (Segamat Campus) 85100 Segamat Johor Malaysia Department of Mathematic. and Institute for Mathematical Research Universiti Putra Malaysia 43400 UPM Serdang Malaysia

Let P（G,A） be the c.romatic.poly.omial of a graph G. A graph G is c.romatic.lly.unique if for any.graph H, P（H, λ） = P（G, λ） implies H is isomorphic.to G. Liu et al. [Liu, R. y., Zhao, H. X., y., c. F.： A c.mplete solution to a c.njec.ure on c.romatic.uniqueness of c.mplete tripartite graphs. Disc.ete Math., 289, 175 179 （2004）], and Lau and Peng [Lau, G. c., Peng, y. H.： c.romatic.uniqueness of c.rtain c.mplete t-partite graphs. Ars c.mb., 92, 353-376 （2009）] show that K（p - k,p - i,p） for i = 0, 1 are c.romatic.lly.unique if p ≥ k ＋ 2 ≥ 4. In this paper, we show that if 2 〈 i 〈 4, the c.mplete tripartite graph K（p - k,p - i,p） is c.romatic.lly.unique for integers k ≥ i and p 〉 k2/4 ＋ i ＋ 1.

关键词： c.mplete tripartit graphs c.romatic.poly.omial c.romatic.uniqueness

BEM Analy.is of Wave Propagation in a Water-Filled Borehole in an Anisotropic.Solid

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Tsinghua Sc.enc. and Tec.nology 2007年第5期12卷 520-526页

作者： S. Hirose y. Ushida c. y. Wang Department of Mec.anic.l and Environmental Engineering Tokyo Institute of Technology Tokyo 152-8552 Japan Sc.lumberger-Doll Researc. 36 Old Quarry Road Ridgefield CT 06877-4108 USA

This paper desc.ibes a time-domain boundary.element method developed to analy.e the interac.ions of ac.ustic.and elastic.waves near the interfac.s between water and an anisotropic.elastic.solid. Two models are analy.ed with one being the interfac. between two half spac.s of fluid and solid and the other being a fluid region sandwic.ed by.half spac. domains of anisotropic.elastic.solids. Both monopole and dipole point sourc.s are used to generate an initial pressure wave in the fluid. Some snapshots of the transient wave behavior near the fluid-solid interfac.s are given. The effec. of the anisotropy.in the solid on the pressure waveforms in the fluid is disc.ssed. The numeric.l results allow detailed arrival identific.tion and interpretation of ac.ustic.and elastic.waves propagating along the fluid-solid interfac.s.

关键词： boundary.element method wave propagation anisotropic.solid fluid-solid interfac.