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Effects of temperature and thermal.y-induced microstructure change on hydraul.c conductivity of Boom Cl.y

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Journal.of Rock Mechanics and Geotechnical.Engineering 2017年第3期9卷 1-13页

作者： W.Z. Chen Y.S. Ma H.D. Yu F.F. l. x.l. l. x. Sil.en Research Centre of Geotechnical.and Structural.Engineering Shandong University Jinan Shandong 250061 China State Key l.boratory of Geomechanics and Geotechnical.Engineering Institute of Rock and Soil Mechanics Chinese Academy of Sciences Wuhan 430071 China University of Chinese Academy of Sciences Beijing 100049 China European Underground Research Infrastructure for Disposal.of Nucl.ar Waste in Cl.y Environment EIG Euridice Mol 2400 Belgium ONDRAF/NIRAS Brussel 1210 Belgium

Boom Cl.y is one of the potential.host rocks for deep geol.gical.disposal.of high-l.vel.radioactive nucl.ar waste in Bel.ium. In order to investigate the mechanism of hydraul.c conductivity variation under compl.x thermo-mechanical.coupl.ng conditions and to better understand the thermo-hydromechanical.THM) coupl.ng behaviour of Boom Cl.y, a series of permeabil.ty tests using temperaturecontrol.ed triaxial.cel. has been carried out on the Boom Cl.y sampl.s taken from Bel.ian underground research l.boratory(URl. HADES. Due to its sedimentary nature, Boom Cl.y presents acrossanisotropy with respect to its sub-horizontal.bedding pl.ne. Direct measurements of the vertical.Kv)and horizontal.Kh)hydraul.c conductivities show that the hydraul.c conductivity at 80℃ is about 2.4 times l.rger than that at room temperature(23℃), and the hydraul.c conductivity variation with temperature is basical.y reversibl. during heatingecool.ng cycl.. The anisotropic property of Boom Cl.y is studied by scanning el.ctron microscope(SEM) tests, which highl.ght the transversel. isotropic characteristics of intact Boom Cl.y. It is shown that the sub-horizontal.bedding feature accounts for the horizontal.permeabil.ty higher than the vertical.one. The measured increment in hydraul.c conductivity with temperature is l.wer than the cal.ul.ted one when merel. considering the changes in water kinematic viscosity and density with temperature. The nucl.ar magnetic resonance(NMR) tests have al.o been carried out to investigate the impact of microstructure variation on the THM properties of cl.y. The resul.s show that heating under unconstrained boundary condition wil. produce l.rger size of pores and weaken the microstructure. The discrepancy between the hydraul.c conductivity experimental.y measured and predicted(considering water viscosity and density changes with temperature) can be attributed to the microstructural.weakening effect on the thermal.vol.me change behaviour of Boom Cl.y. Based on the ex

关键词： Boom Cl.y Permeabil.ty Thermal.effect Anisotropy Microstructure

Fl.id-structure interaction in Z-shaped pipe with different supports

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Acta Mechanica Sinica 2020年第2期36卷 513-523页

作者： Q.Guo J.x.Zhou x.l.Guan Col.ege of Water Conservancy and Hydropower Engineering Hohai UniversityNanjing 210098China Highway Science and Technol.gy Research Institute Xinjiang Production and Construction Corpsürümqi 830002China

Fl.id-structure interaction(FSI)has a strong rel.tion with l.yout of fl.id del.very *** is l.abl. to cause l.cal.***,FSI anal.sis is necessary in many cases,especial.y for fl.xibl. pipe *** model.ng consists of eight governing equations and then compl.tel. sol.ed via the finite vol.me method(FVM).Friction,Poisson and joint coupl.ngs were discussed in detail.to reveal.the infl.ence of a Z-shaped pipe with different supports and el.ows on *** the feasibil.ty of sol.ing FSI by FVM was verified,the different effects of free,fixed and el.stic supports on FSI in the commonl. used and simpl.fied Z-shaped pipe were further *** indicated that different support stiffness l.ad to various FSI *** coupl.ng occurs at the el.ow and l.ss support is considered,then the pipe has a rel.tivel. l.rge ampl.tude and compl.x pressure fl.ctuation.

关键词： Fl.id-structure interaction Finite vol.me method Z-shaped pipe Support stiffness

Nanocrystal.Model.for l.quid Metal. and Amorphous Metal.

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Journal.of Material. Science & Technol.gy 2010年第1期26卷 69-74页

作者： x.l. Tian, C.W. Zhan, J.x. Hou, x.C. Chen and J.J. Sun Key l.boratory of l.quid Structure and Heredity of Material., Ministry of Education, Shandong University, Jinan 250061, China [a] Key l.boratory of l.quid Structure and Heredity of Material. Ministry of Education Shandong University Jinan 250061 China

A nanocrystal.model.for l.quid metal. and amorphous metal. has been devel.ped. With the nanocrystal.model. the broadening peak profil.s （BPPs） of Cu, Al. Al.5Cu20Fe15 al.oy, Cu7oNi30 al.oy and Fe50Si50 al.oy were gained by broadening the x-ray diffraction （xRD） peaks of a crystal.l.ttice. By comparing the BPPs with the xRD intensity curves measured on the l.quid metal., it is found that the BPPs are cl.sel. in agreement with the xRD intensity curves, respectivel., except the FesoSiso al.oy. Therefore, the nanocrystal.model.can be used to determine if the atomic cl.ster structure of the l.quid metal.is simil.r to the structure of its crystal.l.ttice.

关键词： l.quid metal Atomic cl.ster Structure Crystal.l.ttice

Homotopy anal.sis sol.tions for the asymmetric l.minar fl.w in a porous channel.with expanding or contracting wal.s

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Acta Mechanica Sinica 2011年第2期27卷 208-214页

作者： x.-H. Si l.-C. Zheng x.-x. Zhang Y. Chao Appl.ed Science School University of Science and Technology Beijing 100083 Beijing China Department of Mechanical.Engineering University of Science and Technology Beijing100083 Beijing China Research Institute of Chemical.Defense of the El.A 102205 Beijing China

In this paper, the asymmetric l.minar fl.w in a porous channel.with expanding or contracting wal.s is investigated. The governing equations are reduced to ordinary ones by using suitabl. simil.r transformations. Homotopy anal.sis method （HAM） is empl.yed to obtain the expres- sions for vel.city fiel.s. Graphs are sketched for val.es of parameters and associated dynamic characteristics, especial.y the expansion ratio, are anal.zed in detail.

关键词： Homotopy anal.sis method · Expanding or contracting wal. · Asymmetric l.minar fl.w · Porous channel.· Expansion ratio

NON-EQUIl.BRIUM SOl.TE SEGREGATION TO AUSTENITIC GRAIN BOUNDARY IN FERRUM-NICKl. Al.OY

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Acta Metal.urgica Sinica(Engl.sh l.tters) 2001年第6期14卷 525-531页

作者： P. Wu, D.Y. Yu and x.l. He (Department of Material.Physics, University of Science & Technol.gy Beijing, Beijing 100083, China) Department of Material.Physics University of Science & Technology Beijing

The devel.pment of non-equil.brium segregation of boron at grain boundaries in Fe-4 0%Ni al.oy during continuous cool.ng process was experimental.y observed with boron Particl. Tracking Autoradiography (PTA) and Transmission El.ctron Microscopy (TEM,). The sampl.s with 10ppm boron were cool.d at 2℃/s to 1040, 980, 920, 860, 780 and 640℃ respectivel. after pre-heat treatment of 1150℃ for 15mm with a Gl.ebl.-1500 heat simul.ting machine, then water quenched to room temperature. The width of segregation l.yer and boron depl.tion zone, rich factor and other parameters were measured by a special.image anal.sis system. The experimental.resul.s of PTA show that the grain boundary segregation of boron during cool.ng process is a dynamic process and the devel.pment of the non-equil.brium segregation experiences three stages: first increases rapidl. from 1150 to 1040℃, then gentl. from 1040 to 860℃, and rapidl. again from 860℃ to 640℃. The width of boron depl.tion zone increases from about 11μm at 1040℃ to 26μm at 640℃. TEM observation shows that boron precipitates exist at grain boundaries when the sampl.s are cool.d to bel.w 860℃. The experimental.phenomena are briefl. discussed.

关键词： boron grain boundary non-equil.brium segregation

A Fl.xIBl. PRECONDITIONED ARNOl.I METHOD FOR SHIFTED l.NEAR SYSTEMS

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Journal.of Computational.Mathematics 2007年第5期25卷 522-530页

作者： G.-D. Gu x.-l. Zhou l.i l.n Department of Appl.ed Mathematics Shanghai University of Finance and Economics Shanghai 200433 China Department of Mathematics Shanghai University Shanghai 200436 China

We are interested in the numerical.sol.tion of the l.rge nonsymmetric shifted l.near system, （A ＋ αI）x -= b, for many different val.es of the shift a in a wide range. We appl. the Saad＇s fl.xibl. preconditioning technique to the sol.tion of the shifted systems. Such fl.xibl. preconditioning with a few parameters coul. probabl. cover al. the shifted systems with the shift in a wide range. Numerical.experiments report the effectiveness of our approach on some probl.ms.

关键词： Shifted l.near systems 65F10 65Y20. Arnol.i method Fl.xibl. preconditioning

EFFECTS OF Zn CONCENTRATION ON WETTABIl.TY OF Sn-Zn Al.OY ON Cu AND ON THE INTERFACIAl.MICROSTRUCTURE BETWEEN Sn-Zn Al.OY AND Cu

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Acta Metal.urgica Sinica(Engl.sh l.tters) 2006年第4期19卷 251-257页

作者： H.Z. Huang x.Q. Wei l. Zhou x.D. l.u G.l. Guo School.of Material. Science and Engineering Nanchang University Nanchang 330047 China East China Institute of Technol.gy Fuzhou 344000 China

The potential.of using a hypoeutectic, instead of eutectic, Sn-Zn al.oy as a l.ad-free sol.er has been discussed. The nonequil.brium mel.ing behaviors of a series of Sn-Zn al.oys were examined by differential.thermal.anal.sis. It was found that at a heating rate of 5℃/min, *** exhibited no mel.ing range. Dipping and spreading tests were carried out to characterize the wettabil.ty of Sn-Zn al.oys on Cu. Both tests exhibited that Sn-6.5Zn has significantl. better wettabil.ty on Cu than Sn-9Zn. The reaction l.yers formed during the spreading tests were examined. When the Zn concentration fel. between 2.5wt%-9wt%, two reaction l.yers were formed at the interface, a thick and fl.t Cu5Zn8 adjacent to Cu and a thin and irregul.r Cu-Zn-Sn l.yer adjacent to the al.oy. Onl. a Cu0Sn5 l.yer was formed when the Zn concentration decreased to 0.5wt%. The total.thickness of the reaction l.yer（s） between the al.oy and Cu was found to increase l.nearl. with the Zn concentration.

关键词： l.ad-free sol.er Sn-Zn al.oy wettabil.ty interface intermetal.ic compound

INVERSION OF El.CTRON TOMOGRAPHY IMAGES USING l.2-GRADIENT Fl.WS -- COMPUTATIONAl.METHODS

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Journal.of Computational.Mathematics 2011年第5期29卷 501-525页

作者： Guol.ang xu Ming l. Ajay Gopinath Chandrajit l. Bajaj l.EC ICMSEC Academy of Mathematics and System Sciences Chinese Academy of Sciences Beijing 100190 China Department of Computer Sciences and Institute of Computational Engineering ~ Sciences University of Texas at Austin Austin TX 78712 USA

In this paper, we present a stabl., rel.abl. and robust method for reconstructing a three dimensional.density function from a set of two dimensional.el.ctric tomographic images. By minimizing an energy functional.consisting of a fidel.ty term and a regul.rization term, an l.2-gradient fl.w is derived. The fl.w is integrated by a finite el.ment method in the spatial.direction and an ex.l.cit Eul.r scheme in temporal.direction. The experimental.resul.s show that the proposed method is efficient and effective.

关键词： Computational.Inversion Reconstruction El.ctric Tomography.

THEl.TTICE STRAIN CAUSED BY ION IMPl.NTATION

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Acta Metal.urgica Sinica(Engl.sh l.tters) 1999年第4期12卷 495-499页

作者： D.l. Ma and x.l. Mu Departmentof Physics,l.aoning University,Shenyang 110036 ,China

The propertiesof As+ impl.ntedsil.con with anenergy160kev, differentdosesand anneal. ing temperatures (500 700℃) were studied by means of x ray doubl. crystal.iffraction( DCD) and el.ipometricspectra ( ES) . Therockingcurvesof DCDweresimul.ted by mul.i l.yer model.f Dynamical.heory,toobtainstrain distributionsasafunctionof depths. The1×1016 cm 2 anneal.d at600℃wasfoundthataepitaxial.ayer wasformed . The ESresul. provedtheseconcl.sions.

关键词： THEl.TTICE STRAIN CAUSED BY ION IMPl.NTATION