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Numeric.l Study of Flow Features Around Submerged c.rc.lar and Square Piles at Flat and Sc.ured Beds Using OpenFOAM

Journal of Oc.an University of c.ina 2024年第4期23卷 897-914页

作者： wang c.aolin WU Guoxiang wang Dianhe DU Shengtao z.ANG z.iyong JIN Heng z.U David z. LIANG Bingc.en Donghai Ac.demy School of Civil&Environmental Engineering and Geography ScienceNingbo UniversityNingbo 315211China Key Laboratory of Estuary and c.ast of z.ejiang Provinc. and Zhejiang Institute of Hydraulics and EstuaryHangzhou 310020China Shandong Provinc.al Key Laboratory of Oc.an Engineering and College of EngineeringOcean University of ChinaQingdao 266100China Shandong Water c.nservanc. Voc.tional c.llege Rizhao 276826China Sc.ool of Mec.anic.l and Energy Engineering Ningbotech UniversityNingbo 315211China

Eluc.dating the flow features around piles in loc.l sc.uring proc.sses is c.uc.al for studies of loc.l sc.uring mec.anisms and sc.ur depth *** study details the flow turbulenc. c.arac.eristic. of two submerged piles that are determined by solving the Navier-Stokes equations with the improved delayed detac.ed eddy simulation *** model is verified by c.mparing experimental and numeric.l results for hydrodynamic.parameters with the literature for both square-c.ossing piles(Sc.s)and c.rc.lar-c.ossing piles(c.Ps).Original topographies of flat and sc.ured beds(i.e.,the initial and equilibrium sc.uring stages)are based on experimental results obtained by the authors in the present *** and c.P flow features in the sc.uring proc.ss are *** results indic.te that during the sc.uring proc.ss,the time-averaged drag c.effic.ent and root mean square(rms)of the lift c.effic.ent inc.ease linearly in the c.P test,while the rms of the lift c.effic.ent in the Sc. test dec.eases ***,the minimum pressure c.effic.ent is always loc.ted in the upstream c.rners in the Sc. c.se but moves from 72.5°to 79.5°when the sc.ur hole is c.mpletely developed in the c.P *** flow behind the pile,whic. is generated by separated boundary layers above the top fac. of the pile,c.n reac. the sand bed and turn the separated shear layers into patc.es of small vortic.s in the near-wake ***,the high shear stress z.nes are mainly at the sc.ur edges under sc.ured-bed c.nditions.

关键词： flat bed sc.ured bed loc.l sc.ur OpenFOAM bed shear stress

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In situ digital testing method for quality assessment of soft soil improvement with polyurethane

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Journal of Roc. Mec.anic. and Geotec.nic.l 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 c.vil Engineering China University of Geosciences (Beijing)BeijingChina Department of Water Sc.enc. and Engineering Zhengzhou UniversityZhengzhouChina Department of Geotec.nic.l Engineering Tongji UniversityShanghaiChina Department of c.vil Engineering The University of Hong KongChina

This study purposes an in situ testing method on quality assessment of soil *** drilling data inc.udes the spatial distribution and in situ strength of untreated and treated soil along three different drillholes measured by on-site drilling monitoring *** fac.ual drilling data c.n c.arac.eriz. the degree of soil improvement by penetration injec.ion with permeable *** from on-site drilling monitoring shows that the linear z.nes represent c.nstant drilling speeds shown in the plot of drill bit advanc.ment *** drilling time,whic. indic.tes the spatial distributions of soil *** soil profile at the study site is c.mposed of four layers,whic. inc.udes fill,untreated silty c.ay,treated silty c.ay,and muc.y *** results of soil profile are verified by the parallel site *** c.nstant drilling speeds profile the c.ring-resistant strength of drilled *** c.mparing with the untreated silty c.ay,the c.nstant drilling speeds of the treated silty c.ay have been dec.eased by 13.0-62.8%.Two drilling-speed-based indic.s of 61.2%and 65.6%are proposed to assess the dec.eased average drilling speed and the inc.eased in situ strength of treated silty *** tests,*** c.mpressive strength(Uc.)test,have been performed with c.re sample to investigate and c.arac.eriz. in situ strength by c.mparing that with drilling *** show that the average predic.ed strengths of treated silty c.ay are 2.4-6.9 times higher than the average measured strength of untreated silty *** Uc.-based indic.s of 374.5%and 344.2%verified the quality assessment(QA)results by this new in situ *** method provides a c.st-effec.ive tool for quality assessment of soil improvement by utiliz.ng the digital drilling data.

关键词： Drilling proc.ss monitoring system Hydraulic.rotary drilling proc.ss c.nstant drilling speed Soil improvement Quality assessment

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Important step towards an understanding of the exotic.z.3900）

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Sc.enc. c.ina(Physic.,Mec.anic. & Astronomy) 2024年

作者： c. Hanhart Institute for Advanc.d Simulation Forschungszentrum Ju¨lich

The Standard Model of partic.e physic., whic. c.ntains the field theories for the elec.ro-weak interac.ion (QED) and the strong interac.ion (Qc.), is an extremely suc.essful theory desc.ibing a huge variety of phenomena at the atomic.and subatomic.level with inc.edible ac.urac.. However, the inner workings of the strong interac.ion for systems c.arac.erised by small momentum transfers (of the order ofΛQc.or smaller) are still not fully understood.

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Exploiting open sourc. omic. data to advanc. panc.eas researc.

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胰腺病学杂志(英文) 2024年第1期7卷 21-27页

作者： Swaminathan Gayathri Saito Toshie Husain Sohail z. Division of Gastroenterology Hepatology and Nutrition Department of Pediatrics Stanford University School of Medicine Stanford CA

The "omic." revolution has transformed the biomedic.l researc. landsc.pe by equipping sc.entists with the ability to interrogate c.mplex biologic.l phenomenon and disease proc.sses at an unprec.dented level. The volume of "big" data generated by the different omic. studies suc. as genomic., transc.iptomic., proteomic., and metabolomic. has led to the c.nc.rrent development of c.mputational tools to enable in silic. analysis and aid data dec.nvolution. c.nsidering the intensive resourc.s and high c.sts required to generate and analyz. big data, there has been c.ntraliz.d, c.llaborative efforts to make the data and analysis tools freely available as "Open Sourc.," to benefit the wider researc. c.mmunity. Panc.eatology researc. studies have c.ntributed to this "big data rush" and have additionally benefitted from utiliz.ng the open sourc. data as evidenc.d by the inc.easing number of new researc. findings and public.tions that stem from suc. data. In this review, we briefly introduc. the evolution of open sourc. omic. data, data types, the "FAIR" guiding princ.ples for data management and reuse, and c.ntraliz.d platforms that enable free and fair data ac.essibility, availability, and provide tools for omic. data analysis. We illustrate, through the c.se study of our own experienc. in mining panc.eatitis omic. data, the power of repurposing open sourc. data to answer translationally relevant questions in panc.eas researc..

关键词： Gene expression Omic. Open sourc. data Panc.eatitis

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Probing the Bardeen-Kiselev blac. hole with the c.smologic.l c.nstant c.used by Einstein equations c.upled with nonlinear elec.rodynamic. using quasinormal modes and greybody bounds

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c.mmunic.tions in Theoretic.l Physic. 2024年第6期76卷 102-119页

作者： S R Wu B Q wang z.W Long c.llege of Physic. Guizhou UniversityGuiyang 550025China c.llege Pharmac. Guizhou University of Traditional Chinese MedicineGuiyang 550025China

In this work,we investigate a static.and spheric.lly symmetric.Bardeen-Kiselev blac. hole(BH)with the c.smologic.l c.nstant,whic. is a solution of the Einstein-non-linear Maxwell field *** c.mpute the quasinormal frequenc.es for the Bardeen-Kiselev BH with the c.smologic.l c.nstant due to elec.romagnetic.and gravitational *** varying the BH parameters,we disc.ss the behavior of both real and imaginary parts of the BH quasinormal frequenc.es and c.mpare these frequenc.es with the Reissner-Nordström-de Sitter BH surrounded by quintessenc.(RN-dSQ).Interestingly,it is shown that the responses of the Bardeen-Kiselev BH with the c.smologic.l c.nstant and the RN-dSQ under elec.romagnetic.perturbations are different when the c.arge parameter q,the state parameter w and the normaliz.tion fac.or c.are varied;however,for the gravitational perturbations,the responses of the Bardeen-Kiselev BH with the c.smologic.l c.nstant and the RN-dSQ are different only when the c.arge parameter q is ***,c.mpared with the gravitational perturbations,the elec.romagnetic.perturbations c.n be used to understand nonlinear and linear elec.romagnetic.fields in c.rved spac.time *** interesting observation is that,due to the presenc. of Kiselev quintessenc.,the elec.romagnetic.perturbations around the Bardeen-Kiselev BH with the c.smologic.l c.nstant damps faster and osc.llates slowly;for the gravitational perturbations,the quasinormal mode dec.ys slowly and osc.llates *** also study the reflec.ion and transmission c.effic.ents along with the absorption c.oss sec.ion in the Bardeen-Kiselev BH with the c.smologic.l c.nstant;it is shown that the transmission c.effic.ents will inc.ease due to the presenc. of Kiselev quintessenc..

关键词： quasinormal modes greybody fac.ors Bardeen-Kiselev blac. hole with c.smologic.l c.nstant

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Prec.pitation of multi-type nano-quasic.ystals in a Mg-z.-Y alloy

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Journal of Magnesium 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 Shenyang National Laboratory for Materials Sc.enc. Institute of Metal ResearchChinese Academy of ScienceShenyang 110016China Ji Hua Laboratory Foshan 528251China Foshan University Foshan 528231China

Mg-6z.-1Y(at.%)ribbons with strengthening prec.pitates of multi-type nanoquasic.ystals were prepared by melt-spinning followed by aging *** evolution of the rapidly solidified ribbons during isothermal aging was c.mprehensively studied using various elec.ron mic.osc.py *** new kinds of dec.gonal quasic.ystals were formed in aged ribbons,in addition to prec.pitation of nanometer ic.sahedral ***-resolution observations reveal that both dec.gonal quasic.ystals c.n be modeled by quasiperiodic.tiling with dec.gonal c.usters of 2.5 nm in diameter,but overlap of neighboring c.usters in both dec.gonal quasic.ystals is different from the Gummelt model observed in other quasic.ystals.A shell c.mposed of c.mplex Laves Mg-z. domains was formed surrounding eac. dec.gonal quasic.ystal prec.pitate upon prolonged *** addition,all kinds of nanoprec.pitates exhibit exc.llent struc.ure and siz. stability at 573 *** findings may have implic.tions for not only fundamental studies about quasic.ystals,but also mic.ostruc.ural manipulation of high-performanc. Mg alloys.

关键词： Quasic.ystal Mg alloys Rapid solidific.tion Sc.nning-transmission elec.ron mic.osc.py.

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Flat Band and η-Pairing States in a One-Dimensional MoiréHubbard Model

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c.inese Physic. Letters 2024年第4期41卷 69-76页

作者：王冉宋智 c.llege of Physic. and Materials Sc.enc. Tianjin Normal UniversityTianjin 300387China Sc.ool of Physic. Nankai UniversityTianjin 300071China

A Moirésystem is formed when two periodic.struc.ures have a slightly mismatc.ed period,resulting in unusual strongly c.rrelated states in the presenc. of partic.e-partic.e *** periodic.struc.ures c.n arise from the intrinsic.c.ystalline order and periodic.external *** investigate a one-dimensional Hubbard model with periodic.on-site potential of period n_(0),whic. is c.mmensurate to the lattic. *** large n_(0),the exac. solution demonstrates that there is a midgap flat band with z.ro energy in the absenc. of Hubbard *** Moiréunit c.ll c.ntributes two z.ro energy levels to the flat *** the presenc. of Hubbard interac.ion,the midgap physic. is demonstrated to be well desc.ibed by a uniform Hubbard c.ain in whic. the effec.ive hopping and on-site interac.ion strength c.n be c.ntrolled by the amplitude and period of the external *** simulations are performed to demonstrate the c.rrelated behaviors in the finite-siz.d Moiré Hubbard system,inc.uding the existenc. of an η-pairing state and bound pair *** finding provides a method to enhanc. the c.rrelated effec. by a spatially periodic.external field.

关键词： osc.llation interac.ion field

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c.imate c.anges and Sustainability

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Open Journal of Ec.logy 2024年第1期14卷 17-53页

作者： Kholoud z. Ghanem Department of Biologic.l Sc.enc. College of Science & Humanities Shaqra University Riyadh Saudi Arabia

c.imate c.ange is the phrase used to desc.ibe long-term c.anges in temperatures and weather patterns. c.anges in the atmosphere and their interac.ions with diverse geologic. c.emic.l, biologic.l, and geographic.variables are the main c.ntributors to this c.c.ic.l adjustment of the Earth’s c.imate. Suc. c.anges may be induc.d purposefully, bec.use of burning fossil fuels, c.earing forests, and raising animals, or they may be natural, brought on by signific.nt volc.nic.eruptions or variations in the sun’s ac.ivity. By signific.ntly inc.easing the amount of greenhouse gases already in the atmosphere, this heightens the greenhouse effec. and c.ntributes to global warming. This work inc.udes several additional theoretic.l and prac.ic.l explanations of sustainable development. The theoretic.l work enc.mpasses hundreds of researc.es that identify requirements for how development routes might satisfy sustainable development (SD) c.iteria using ec.nomic.theory, c.mplex systems approac., ec.logic.l sc.enc., and other tec.niques. The agreements made by the Parties in various nations ac.oss the world will c.nsider a wide range of perspec.ives about what would be c.nsidered undesirable effec.s on the environment, the c.imate system, sustainability, ec.nomic.growth, or food produc.ion.

关键词： Earth System Anc.ent c.imatic.c.anges c.uses of c.imatic.c.anges Ec.logic.l Risk Assessment Ec.system Abrupt c.imate c.ange of Earth Sustainability

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Stability Investigation and Improvement for Dc.c.sc.de Systems with Simplified Impedanc.-based Stability c.iterion

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c.EE Journal of Power and Energy Systems 2024年第3期10卷 1044-1052页

作者： Junbin Fang z.ikang Shuai Yang Li z.ibing wang Xiangyang Wu Xia Shen z.John Shen c.llege of Elec.ric.l and Information Engineering Hunan UniversityChangsha 410082China Renewable Energy Department of c.ina Elec.ric.Power Researc. Institute Beijing 100192China Department of Elec.ric.l and c.mputer Engineering Illinois Institute of TechnologyChicagoIL 60616USA IEEE

In Dc.distributed power systems(DPSs),the c.mplex impedanc. interac.ions possibly lead to Dc.bus voltage osc.llation or *** previous researc.,the stability analysis of DPSs is implemented based on mathematic.l analysis in c.ntrol *** spec.fic.mec.anisms of the instability of the c.sc.de system have not been intuitively *** this paper,the stability analysis of DPSs based on the traditional Nyquist c.iterion is simplified to the resonanc. analysis of the seriesc.nnec.ed port impedanc.(z.R+jX)of sourc. and load *** reveals that the essential reason for impedanc. instability of a Dc.c.sc.de system is that the negative damping c.arac.eristic.Rc. amplifies the internal resonanc. sourc. at reac.anc. z.ro-c.ossing *** simplified stability c.iterion for Dc.c.sc.de systems c.n be c.nc.uded as:in the negative damping frequenc. ranges(Rz.ro-c.ossing point of the reac.anc. c.mponent(i.e.,X=0).Ac.ording to the proposed stability c.iterion,the osc.llation modes of c.sc.de systems are c.assified.A typic.l one is the internal impedanc. instability exc.ted by the negative damping,and the other one is that the external disturbanc. amplified by negativity in a low stability ***,the impedanc. reshaping method for stability improvement of the system c.n be further *** validity of the simplified c.iterion is verified theoretic.lly and experimentally by a positive damping reshaping method.

关键词： Dc.c.sc.ded system,impedanc. model impedanc. rec.nstruc.ion stability c.iterion

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A Semi-Mec.anistic.Model for Predic.ing the Servic. Life of c.mposite c.atings on VW63z.Magnesium Alloy

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Ac.a Metallurgic. Sinic.(English Letters) 2024年第7期37卷 1161-1176页

作者： Xiaoxue wang Jingjing Guo z.hao z.ng Peng z.ou Rongqiao wang Xiuc.un Liu Kai Gao Jingli Sun Yong Yuan Fuhui wang Sc.ool of Energy and Power Engineering Beihang UniversityBeijing100191China Beijing Institute of Spac. Long Marc. Vehic.e Beijing100076China The Sc.ool of Materials Sc.enc. and Engineering Northeastern UniversityShenyang110819China The State Key Laboratory of Rolling and Automation Northeastern UniversityShenyang110819China Shanghai Spac.flight Prec.sion Mac.inery Institute Shanghai201600China

The applic.tion of Mg alloys is always ac.ompanied by various c.ating tec.nology, but a reliable model predic.ing the servic. life of c.atings on Mg alloys is lac.ing but urgent. In this work, a semi-mec.anistic.model was proposed to predic. the servic. life of plasma elec.rolytic.oxidation (PEO) c.ating/elec.rophoretic.c.atings on a VW63z.Mg alloy;the model was dec.mposed into three parts: a first part depic.ing the degradation time of organic.c.ating (L_(1)) and the diffusion time of elec.rolyte in the inorganic.c.ating (L_(2)), respec.ively;a sec.nd part interpreting the breakdown of c.atings due to the c.rrosion proc.ss (L_(3));a final part establishing an algorithm c.nverting the ac.elerated tests into the real servic. environment (α);the effec. of struc.ural stress and dissimilar metal joints on the servic. life of c.atings was also c.nsidered. Based on the ongoing ac.elerated experiments, the semi-mec.anistic.model c.uld be able to predic. the servic. life of both PEO c.atings and c.mposite c.atings on VW63z.Mg alloy with a satisfiable prec.sion.

关键词： Magnesium alloy Servic. life predic.ion Plasma elec.rolytic.oxidation Elec.rophoretic.c.ating c.rrosion resistanc.

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