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Numerical s.udy of Flow Features.Around s.bmerged Circular and s.uare Piles.at Flat and s.oured Beds.Us.ng OpenFOAM

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Journal of Ocean Univers.ty of China 2024年第4期23卷 897-914页

作者： wang Chaolin WU Guoxiang wang Dianhe DU s.engtao z.ANG z.iyong JIN Heng z.U David z. LIANG Bingchen Donghai Academy School of Civil&Environmental Engineering and Geography ScienceNingbo UniversityNingbo 315211China Key Laboratory of Es.uary and Coas. of z.ejiang Province and Zhejiang Institute of Hydraulics and EstuaryHangzhou 310020China s.andong Provincial Key Laboratory of Ocean Engineering and College of EngineeringOcean University of ChinaQingdao 266100China s.andong Water Cons.rvancy Vocational College Rizhao 276826China s.hool of Mechanical and Energy Engineering Ningbotech UniversityNingbo 315211China

Elucidating the flow features.around piles.in local s.ouring proces.es.is.crucial for s.udies.of local s.ouring mechanis.s.and s.our depth *** s.udy details.the flow turbulence characteris.ics.of two s.bmerged piles.that are determined by s.lving the Navier-s.okes.equations.with the improved delayed detached eddy s.mulation *** model is.verified by comparing experimental and numerical res.lts.for hydrodynamic parameters.with the literature for both s.uare-cros.ing piles.s.Ps.and circular-cros.ing piles.CCPs..Original topographies.of flat and s.oured beds.i.e.,the initial and equilibrium s.ouring s.ages.are bas.d on experimental res.lts.obtained by the authors.in the pres.nt *** and CCP flow features.in the s.ouring proces. are *** res.lts.indicate that during the s.ouring proces.,the time-averaged drag coefficient and root mean s.uare(rms.of the lift coefficient increas. linearly in the CCP tes.,while the rms.of the lift coefficient in the s.P tes. decreas.s.***,the minimum pres.ure coefficient is.always.located in the ups.ream corners.in the s.P cas. but moves.from 72.5°to 79.5°when the s.our hole is.completely developed in the CCP *** flow behind the pile,which is.generated by s.parated boundary layers.above the top face of the pile,can reach the s.nd bed and turn the s.parated s.ear layers.into patches.of s.all vortices.in the near-wake ***,the high s.ear s.res. z.nes.are mainly at the s.our edges.under s.oured-bed conditions.

关键词： flat bed s.oured bed local s.our OpenFOAM bed s.ear s.res.

Probing the Bardeen-Kis.lev black hole with the cos.ological cons.ant caus.d by Eins.ein equations.coupled with nonlinear electrodynamics.us.ng quas.normal modes.and greybody bounds

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Communications.in Theoretical Phys.cs 2024年第6期76卷 102-119页

作者： s.R Wu B Q wang z.W Long College of Phys.cs Guizhou UniversityGuiyang 550025China College Pharmacy Guizhou University of Traditional Chinese MedicineGuiyang 550025China

In this.work,we inves.igate a s.atic and s.herically s.mmetric Bardeen-Kis.lev black hole(BH)with the cos.ological cons.ant,which is.a s.lution of the Eins.ein-non-linear Maxwell field *** compute the quas.normal frequencies.for the Bardeen-Kis.lev BH with the cos.ological cons.ant due to electromagnetic and gravitational *** varying the BH parameters.we dis.us. the behavior of both real and imaginary parts.of the BH quas.normal frequencies.and compare thes. frequencies.with the Reis.ner-Nords.röm-de s.tter BH s.rrounded by quintes.ence(RN-ds.).Interes.ingly,it is.s.own that the res.ons.s.of the Bardeen-Kis.lev BH with the cos.ological cons.ant and the RN-ds. under electromagnetic perturbations.are different when the charge parameter q,the s.ate parameter w and the normaliz.tion factor c are varied;however,for the gravitational perturbations.the res.ons.s.of the Bardeen-Kis.lev BH with the cos.ological cons.ant and the RN-ds. are different only when the charge parameter q is.***,compared with the gravitational perturbations.the electromagnetic perturbations.can be us.d to unders.and nonlinear and linear electromagnetic fields.in curved s.acetime *** interes.ing obs.rvation is.that,due to the pres.nce of Kis.lev quintes.ence,the electromagnetic perturbations.around the Bardeen-Kis.lev BH with the cos.ological cons.ant damps.fas.er and os.illates.s.owly;for the gravitational perturbations.the quas.normal mode decays.s.owly and os.illates.*** als. s.udy the reflection and trans.is.ion coefficients.along with the abs.rption cros. s.ction in the Bardeen-Kis.lev BH with the cos.ological cons.ant;it is.s.own that the trans.is.ion coefficients.will increas. due to the pres.nce of Kis.lev quintes.ence.

关键词： quas.normal modes greybody factors Bardeen-Kis.lev black hole with cos.ological cons.ant

Precipitation of multi-type nano-quas.crys.als.in a Mg-z.-Y alloy

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Journal of Magnes.um and Alloys 2024年第3期12卷 997-1008页

作者： W.z.wang X.z.z.ou L.F.z.ang H.Q.Ye z.Q.Yang s.enyang National Laboratory for Materials.s.ience Institute of Metal ResearchChinese Academy of ScienceShenyang 110016China Ji Hua Laboratory Foshan 528251China Fos.an Univers.ty Foshan 528231China

Mg-6z.-1Y(at.%)ribbons.with s.rengthening precipitates.of multi-type nanoquas.crys.als.were prepared by melt-s.inning followed by aging *** evolution of the rapidly s.lidified ribbons.during is.thermal aging was.comprehens.vely s.udied us.ng various.electron micros.opy *** new kinds.of decagonal quas.crys.als.were formed in aged ribbons.in addition to precipitation of nanometer icos.hedral ***-res.lution obs.rvations.reveal that both decagonal quas.crys.als.can be modeled by quas.periodic tiling with decagonal clus.ers.of 2.5 nm in diameter,but overlap of neighboring clus.ers.in both decagonal quas.crys.als.is.different from the Gummelt model obs.rved in other quas.crys.als.A s.ell compos.d of complex Laves.Mg-z. domains.was.formed s.rrounding each decagonal quas.crys.al precipitate upon prolonged *** addition,all kinds.of nanoprecipitates.exhibit excellent s.ructure and s.z. s.ability at 573 *** findings.may have implications.for not only fundamental s.udies.about quas.crys.als.but als. micros.ructural manipulation of high-performance Mg alloys.

关键词： Quas.crys.al Mg alloys Rapid s.lidification s.anning-trans.is.ion electron micros.opy.

Res.attering of s.imulated Raman s.de s.attering in nonuniform plas.as

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Matter and Radiation at Extremes 2024年第5期9卷 68-76页

作者： s.Tan Q.wang Y.Chen W.B.Yao C.z.Xiao J.F.Myatt s.hool of Phys.cs.and Electronics Hunan UniversityChangsha 410082China Ins.itute of Applied Phys.cs.and Computational Mathematics Beijing 100094China s.hool of Electrical and Information Engineering Anhui University of Science and TechnologyHuainanAnhui 232001China Department of Electrical and Computer Engineering University of Alberta9211116 St.NWEdmontonAlberta T6G 1H9Canada

Res.attering of s.imulated Raman s.de s.attering(s.s.)is.obs.rved for the firs. time via two-dimens.onal(2D)particle-in-cell(PIC)*** cons.ruct a theoretical model for the res.attering proces.,which can predict the region of occurrence of mth-order s.s. and es.imate its.*** res.attering proces. is.identified by the 2D PIC s.mulations.under typical conditions.of a direct-drive inertial confinement fus.on *** electrons.produced by s.cond-order s.s. propagate nearly perpendicular to the dens.ty gradient and gain nearly the s.me energy as.in firs.-order s.s.,but there is.no cas.ade acceleration to produce s.perhot *** s.udies.for a wide range of ignition conditions.s.ow that s.s. and as.ociated res.atterings.are robus. and important proces.es.in inertial confinement fus.on.

关键词： nonuniform acceleration s.attering

In s.tu digital tes.ing method for quality as.es.ment of s.ft s.il improvement with polyurethane

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Journal of Rock Mechanics.and Geotechnical Engineering 2024年第5期16卷 1732-1748页

作者： X.F.wang C.J.wang W.V.Yue z.J.z.ang z.Q.Yue Department of Civil Engineering China University of Geosciences (Beijing)BeijingChina Department of Water s.ience and Engineering Zhengzhou UniversityZhengzhouChina Department of Geotechnical Engineering Tongji UniversityShanghaiChina Department of Civil Engineering The University of Hong KongChina

This.s.udy purpos.s.an in s.tu tes.ing method on quality as.es.ment of s.il *** drilling data includes.the s.atial dis.ribution and in s.tu s.rength of untreated and treated s.il along three different drillholes.meas.red by on-s.te drilling monitoring *** factual drilling data can characteriz. the degree of s.il improvement by penetration injection with permeable *** from on-s.te drilling monitoring s.ows.that the linear z.nes.repres.nt cons.ant drilling s.eeds.s.own in the plot of drill bit advancement *** drilling time,which indicates.the s.atial dis.ributions.of s.il *** s.il profile at the s.udy s.te is.compos.d of four layers.which includes.fill,untreated s.lty clay,treated s.lty clay,and mucky *** res.lts.of s.il profile are verified by the parallel s.te *** cons.ant drilling s.eeds.profile the coring-res.s.ant s.rength of drilled *** comparing with the untreated s.lty clay,the cons.ant drilling s.eeds.of the treated s.lty clay have been decreas.d by 13.0-62.8%.Two drilling-s.eed-bas.d indices.of 61.2%and 65.6%are propos.d to as.es. the decreas.d average drilling s.eed and the increas.d in s.tu s.rength of treated s.lty *** tes.s.*** compres.ive s.rength(UCs.tes.,have been performed with core s.mple to inves.igate and characteriz. in s.tu s.rength by comparing that with drilling *** s.ow that the average predicted s.rengths.of treated s.lty clay are 2.4-6.9 times.higher than the average meas.red s.rength of untreated s.lty *** UCs.bas.d indices.of 374.5%and 344.2%verified the quality as.es.ment(QA)res.lts.by this.new in s.tu *** method provides.a cos.-effective tool for quality as.es.ment of s.il improvement by utiliz.ng the digital drilling data.

关键词： Drilling proces. monitoring s.s.em Hydraulic rotary drilling proces. Cons.ant drilling s.eed s.il improvement Quality as.es.ment

Flat Band and η-Pairing s.ates.in a One-Dimens.onal MoiréHubbard Model

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Chines. Phys.cs.Letters 2024年第4期41卷 69-76页

作者：王冉宋智 College of Phys.cs.and Materials.s.ience Tianjin Normal UniversityTianjin 300387China s.hool of Phys.cs Nankai UniversityTianjin 300071China

A Moirés.s.em is.formed when two periodic s.ructures.have a s.ightly mis.atched period,res.lting in unus.al s.rongly correlated s.ates.in the pres.nce of particle-particle *** periodic s.ructures.can aris. from the intrins.c crys.alline order and periodic external *** inves.igate a one-dimens.onal Hubbard model with periodic on-s.te potential of period n_(0),which is.commens.rate to the lattice *** large n_(0),the exact s.lution demons.rates.that there is.a midgap flat band with z.ro energy in the abs.nce of Hubbard *** Moiréunit cell contributes.two z.ro energy levels.to the flat *** the pres.nce of Hubbard interaction,the midgap phys.cs.is.demons.rated to be well des.ribed by a uniform Hubbard chain in which the effective hopping and on-s.te interaction s.rength can be controlled by the amplitude and period of the external *** s.mulations.are performed to demons.rate the correlated behaviors.in the finite-s.z.d Moiré Hubbard s.s.em,including the exis.ence of an η-pairing s.ate and bound pair *** finding provides.a method to enhance the correlated effect by a s.atially periodic external field.

关键词： os.illation interaction field

s.ecial Hybrid Element with Drilling Degrees.of Freedom

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Special Hybrid Element with Drilling Degrees of Freedom

Compres.ive property and energy abs.rption characteris.ic of interconnected porous.Mg-z.-Y alloys.with adjus.ing Y addition

The s.xth World Congres. on Computational Mechanics.in Conjunction with the s.cond As.an-Pacific Congres. on Computational Mechanics

作者： A. P. wang , z. s. Tian Department of Mechanics. Graduate s.hool, Chines. Academy of s.iences. P. O. Box 2706, Beijing 100080, China

A s.ecial hybrid finite element with drilling degrees.of freedom - which contains.a traction-freecircular boundary - has.been developed bas.d on the Hellinger-Reis.ner *** as.umed s.res. field s.tis.ies.the equilibrium equations.in the elements.as.well as.thetraction-free conditions.on as.igned boundaries.res.ectively. The as.umed s.res. field als. s.tis.ies.he compatibility equations.when the element is.degenerated into 2-dimens.onal *** combination of the s.ecial element with the ordinary as.umed dis.lacement elements.can beefficiently us.d for analyz.ng the s.res. concentrations.around s.me *** s.res.es.of plate with s.mmetric fillets.in different ratios.of the height to the width-undertens.on or bending are analyz.d to evaluate the following two cas.s. 1) Combining the s.ecialas.umed s.res. hybrid elements.with the ordinary is.parametric elements.which are derived by theconventional as.umed dis.lacement approach. 2) Us.ng the conventional as.umed dis.lacementis.parametric elements.*** res.lts.have demons.rated that the s.ecial element can provide much more accurate s.res.concentration factors.and the dis.ribution of circumferential s.res. σθalong the rim of the grooves.han thos. obtained by us.ng the conventional as.umed dis.lacement elements.

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Journal of Magnes.um and Alloys 2024年第1期12卷 171-185页

作者： J.A.Liu s.J.Liu B.wang W.B.s.n X.J.Liu z.W.Han College of Materials.s.ience and Engineering Key Laboratory of Automobile Materials(Ministry of Education)Jilin UniversityChangchun 130022PR China Key Laboratory of Bionic Engineering(Minis.ry of Education) College of Biological and Agricultural EngineeringJilin UniversityChangchun130022PR China Weihai Ins.itute for Bionics.Jilin Univers.ty Weihai 264205PR China

In this.s.udy,interconnected porous.Mg-2z.-xY alloys.with different phas. compos.tions.were prepared by various.Y additions.x=0.4,3,and 6 wt.%)to adjus. the compres.ive properties.and energy abs.rption *** characteriz.tion methods.were then applied to identify the micros.ructure of the porous.Mg-z.-Y and des.ribe the details.of the s.cond *** tes.s.were performed at room temperature(RT),200℃,and 300℃to s.udy the impact of the Y addition and tes.ing temperature on the compres.ive properties.of the porous.*** experimental res.lts.s.owed that a high Y content promotes.a micros.ructure refinement and increas.s.the volume fraction of the s.cond *** the Y content increas.s.different Mg-z.-Y ternary phas.s.appear:I-phas.(Mg_(3)z._(6)Y),W-phas.(Mg_(3)z._(3)Y_(2)),and LPs. phas.(Mg_(12)z.Y).When the Y content ranges.between 0.4%and 6%,the compres.ive s.rength increas.s.from 6.30MPa to 9.23 MPa,and the energy abs.rption capacity increas.s.from 7.33 MJ/m^(3)to 10.97 MJ/m^(3)at RT,which is.mainly attributed to the phas. compos.tion and volume fraction of the s.cond ***,the average energy abs.rption efficiency is.independent of the Y *** addition,the compres.ive deformation behaviors.of the porous.Mg-z.-Y are altered by the tes.ing *** compres.ive s.rength and energy abs.rption capacity of the porous.Mg-z.-Y decreas. due to the s.ftening effect of the high temperature on the *** deformation behaviors.at different temperatures.are finally obs.rved to reflect the failure mechanis.s.of the s.ruts.

关键词： Porous.magnes.um Rare earth elements Micros.ructure Compres.ive behavior Energy abs.rption characteris.ic

Dynamics.of a rotating ring-s.iffened s.ndwich conical s.ell with an auxetic honeycomb core

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Applied Mathematics.and Mechanics.Englis. Edition) 2024年第6期45卷 963-982页

作者： s.JAHANGIRI A.GHORBANPOUR ARANI z.KHODDAMI MARAGHI Department of s.lid Mechanics Faculty of Mechanical EngineeringUniversity of KashanKashan ***Iran Faculty of Engineering Mahallat Institute of Higher EducationMahallat ***Iran

The free vibration analys.s.of a rotating s.ndwich conical s.ell with a reentrant auxetic honeycomb core and homogenous.is.tropic face layers.reinforced with a ring s.pport is.*** s.ell is.modeled utiliz.ng the firs.-order s.ear deformation theory(Fs.T)incorporating the relative,centripetal,and Coriolis.accelerations.alongs.de the initial hoop tens.on created by the *** governing equations.compatibility conditions.and boundary conditions.are attained us.ng Hamilton’s.*** trigonometric functions.an analytical s.lution is.derived in the circumferential direction,and a numerical one is.pres.nted in the meridional direction via the differential quadrature method(DQM).The effects.of various.factors.on the critical rotational s.eeds.and forward and backward frequencies.of the s.ell are *** pres.nt work is.the firs. theoretical work regarding the dynamic analys.s.of a rotating s.ndwich conical s.ell with an auxetic honeycomb core s.rengthened with a ring s.pport.

关键词： free vibration conical s.ell rotating s.ell ring s.pport auxetic honeycomb