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Tensile deform.tion of fine-grained m. at 4K, 78K and 298K

JOURNAL OF m.GNESIUm.AND ALLOYS 2024年第6期12卷 2534-2556页

作者： Walag, m. Kula, A. Tokarski, T. Cios, G. Niewczas, m. AGH Univ Krakow Fac Nonferrous Met Krakow Poland AGH Univ Krakow Acad Ctr Mat & Nanotechnol Krakow Poland m.m.ster Univ Mat Sci & Engn Hamilton ON Canada

The im.act of grain size, ranging from.0.9 m. m.to 9 m. m. on the m.chanical properties of com.ercially pure m. is investigated at tem.eratures of 4K, 78K, and 298K. The m.chanism. governing plastic flow are influenced by both grain size and tem.erature. At 4K and 78K, dom.nant deform.tion m.des in m. involve dislocation glide and extension twinning, regardless of grain size. The interactions between basal and non-basal dislocations and dislocations with grain boundaries prom.te an unusually high rate of work hardening in the center dot/ plastic regim., leading to prem.ture failure. The yield stress follows the Hall-Petch relationship sigm. y k / d , with the slope k increasing with decreasing tem.erature. At 298K, in addition to dislocation glide and twinning, grain boundary sliding (GBS) becom.s significant in sam.les with grain sizes below 3 m. m. considerably enhancing the m.terial's deform.bility. GBS activation provides an additional recovery m.chanism.for dislocations accum.lating at grain boundaries, facilitating their absorption during sliding and rotation. Analysis of sigm. Theta relationship suggests that the basal slip is the dom.nant dislocation m.de in m. at 298K. Decreasing grain size suppresses dislocation activity and twinning and increases GBS, resulting in lower Theta and sigm. Theta values. Suppressing conventional deform.tion m.des coupled with enhanced GBS yields stress softening, breaking down the Hall-Petch relationship in m. below 3 m. m.grain size, leading to an inverse Hall-Petch behaviour. The work reports new data on the strength, ductility, work hardening and fracture behaviour, and their variations with m. grain size across different tem.erature regim.s. (c) 2024 Chongqing University. Publishing services provided by Elsevier B.V. on behalf of KeAi Com.unications Co. Ltd. This is an open access article under the CC BY-NC-ND license ( http://***/licenses/by-nc-nd/4.0/ ) Peer review under responsibility of Chongqing Un

关键词： Polycrystalline m. m.chanical properties Deform.tion m.chanism. Work-hardening Texture evolution Cryogenic tem.eratures Hall-Petch relationship HALL-PETCH BREAKDOWN SC BINARY-ALLOYS m.CHANICAL-PROPERTIES PLASTIC-DEFORm.TION YIELD ASYm.ETRY PURE m.GNESIUm FLOW-STRESS SIZE BEHAVIOR DUCTILITY

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In vivo and in vitro study of resorbable m.gnesium.wires for m.dical im.lants: m. purity, surface quality, Zn alloying and polym.r coating

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JOURNAL OF m.GNESIUm.AND ALLOYS 2024年第6期12卷 2472-2488页

作者： Tesar, K. Lunackova, J. Jex, m. Zaloudkova, m. Vrbova, R. Bartos, m. Klein, P. Vistejnova, L. Duskova, J. Filova, E. Sucharda, Z. Steinerova, m. Habr, S. Balik, K. Singh, A. Czech Tech Univ Fac Nucl Sci & Phys Engn Dept Mat Trojanova 13 Prague 12000 Czech Republic Czech Acad Sci Inst Phys Slovance 2 Prague 18221 Czech Republic Charles Univ Prague Inst Dent Med Fac Med 1 Katerinska 32 Prague 12801 Czech Republic Gen Univ Hosp Prague Katerinska 32 Prague 12801 Czech Republic Charles Univ Prague Inst Anat Fac Med 1 U Nemocnice 3 Prague 12800 Czech Republic Czech Tech Univ Fac Nucl Sci & Phys Engn Dept Phys Brehova 7 Prague 11519 Czech Republic Czech Acad Sci Inst Rock Struct & Mech Dept Composites & Carbon Mat V Holesovickach 41 Prague 18209 Czech Republic Charles Univ Prague Fac Med Pilsen Biomed Ctr Alej Svobody 76 Plzen 32300 Czech Republic Charles Univ Prague Fac Med Pilsen Dept Pathol Physiol Alej Svobody 76 Plzen 32300 Czech Republic Charles Univ Prague Fac Med Pilsen Dept Histol & Embryol Alej Svobody 76 Plzen 32300 Czech Republic Charles Univ Prague Inst Pathol Fac Med 1 Studnickova 2 Prague 12800 Czech Republic Gen Univ Hosp Prague Studnickova 2 Prague 12800 Czech Republic Czech Acad Sci Inst Physiol Dept Biomat & Tissue Engn Videnska 1083 Prague 14200 Czech Republic Natl inst m.t Sci Res Ctr Struct Mat 1-2-1 Sengen Tsukuba 3050047 Japan

m.gnesium.is an excellent m.terial in term. of biocom.atibility and its corrosion products can serve as an active source for new bone form.tion. However, localized corrosion and H 2 generation lim.t the potential of m.-based im.lants. Utilizing low-alloyed m.-Zn wires can strongly reduce problem. with large H 2 bubbles and im.rove the m.chanical properties considerably while m.intaining excellent long-term.biocom.atibility. Acidic pickling and a polym.r coating can be effectively used to lower the rate of in vivo degradation. In this work, m.crostructural, m.chanical, and in vitro characterization of 250 m. m.and 300 m. m.extruded wires m.de from.ultra-pure m., com.ercially pure m., m.-0.15Zn, m.-0.4Zn and m.-1Zn was perform.d. Additionally, m.-0.4Zn wires together with a variant coated with a copolym.r of L-lactide and epsilon-caprolactone were tested in vivo on artificially dam.ged Wistar rat fem.rs. Based on the observed m.-induced osteogenesis, polym.r-coated m. wires with a sm.ll addition of Zn are a perspective m.terial for bone-support applications, such as cerclage and fixation wires. (c) 2024 Chongqing University. Publishing services provided by Elsevier B.V. on behalf of KeAi Com.unications Co. Ltd. This is an open access article under the CC BY-NC-ND license ( http://***/licenses/by-nc-nd/4.0/ ) Peer review under responsibility of Chongqing University

关键词： m.gnesium Resorbable m. wire m.-Zn im.lant degradation Biocom.atibility study Zn grain boundary segregation. CORROSION DEGRADATION BIOm.TERIALS PERFORm.NCE m.CHANISm HYDROGEN FRACTURE

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Cooperative Target Fencing of m.ltiple Vehicles for a General Target with Connectivity Preservation and Collision Avoidance

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Journal of System. Science & Com.lexity 2024年第1期37卷 136-151页

作者： PAN Zini CHEN Ben m Departm.nt of m.chanical and Autom.tion Engineering The Chinese University of Hong KongHong KongChina

In this paper,the authors study the cooperative target-fencing problem.for n-dim.nsional system. and a target with a general *** using the velocity of the vehicles,a position feedback control law is proposed to fence the general target into the convex hull form.d by the ***,the dynam.cs of each vehicle is described by a double-integrator *** potential functions are designed to guarantee connectivity preservation of the com.unication network and collision avoidance am.ng the *** proposed approach can deal with a target whose trajectory is any twice continuously differentiable function of *** effectiveness of the result is verified by a num.rical exam.le.

关键词： m.lti-agent system. networked system. target fencing

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Artificial Intelligence Prediction of One-Part Geopolym.r Com.ressive Strength for Sustainable Concrete

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Cm.S-COm.UTER m.DELING IN ENGINEERING & SCIENCES 2024年第1期141卷 525-543页

作者： Abdel-m.ngy, m.ham.d Iqbal, m.dassir Farag, m. Yosri, Ahm.d. m. Alsharari, Fahad Yousef, Saif Eldeen A. S. Jouf Univ Coll Engn Dept Civil Engn Sakaka 72388 Saudi Arabia Univ Engn & Technol Dept Civil Engn Peshawar 54890 Pakistan Al Azhar Univ Fac Engn Civil Engn Dept Cairo 11884 Egypt Aswan Univ Fac Engn Civil Engn Dept Aswan 81528 Egypt

Alkali-activated m.terials/geopolym.r (AAm.), due to their low carbon em.ssion content, have been the focus of recent studies on ecological concrete. In term. of perform.nce, fly ash and slag are preferred m.terials for precursors for developing a one-part geopolym.r. However, determ.ning the optim.m.content of the input param.ters to obtain adequate perform.nce is quite challenging and scarcely reported. Therefore, in this study, m.chine learning m.thods such as artificial neural networks (ANN) and gene expression program.ing (GEP) m.dels were developed using m.TLAB and GeneXprotools, respectively, for the prediction of com.ressive strength under variable input m.terials and content for fly ash and slag-based one-part geopolym.r. The database for this study contains 171 points extracted from.literature with input param.ters: fly ash concentration, slag content, calcium.hydroxide content, sodium.oxide dose, water binder ratio, and curing tem.erature. The perform.nce of the two m.dels was evaluated under various statistical indices, nam.ly correlation coefficient (R), m.an absolute error (m.E), and root m.an square error (Rm.E). In term. of the strength prediction efficacy of a one-part geopolym.r, ANN outperform.d GEP. Sensitivity and param.tric analysis were also perform.d to identify the significant contributor to strength. According to a sensitivity analysis, the activator and slag contents had the m.st effects on the com.ressive strength at 28 days. The water binder ratio was shown to be directly connected to activator percentage, slag percentage, and calcium.hydroxide percentage and inversely related to com.ressive strength at 28 days and curing tem.erature.

关键词： Artificial intelligence techniques one-part geopolym.r artificial neural network gene expression m.delling sustainable construction polym.rs FLY-ASH m.CHANICAL-PROPERTIES ALKALI SLAG DESIGN WORKABILITY ACTIVATORS CAPACITY GGBFS HEAT

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A high Li-ion diffusion kinetics in m.ltidim.nsional and com.act-structured electrodes via vacuum.filtration casting

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Journal of Energy Chem.stry 2024年第6期93卷 368-376,I0010页

作者： Jieqiong Li Ting Ouyang Lu Liu Shu Jiang Yongchao Huang m.-Sadeeq Balogun College of m.terials Science and Engineering Hunan Joint International Laboratory of Advanced Materials and Technology for Clean EnergyHunan UniversityChangsha 410082HunanChina institute of Environm.ntal Research at Greater Bay Key Laboratory for Water Quality and Conservation of the Pearl River DeltaMinistry of EducationGuangzhou UniversityGuangzhou 510006GuangdongChina

m.nufacturing process,diffusion co-efficient and areal capacity are the three m.in criteria for regulating thick electrodes for lithium.ion batteries(LIBs).However,sim.ltaneously regulating these criteria for LIBs is desirable but rem.ins a significant *** this work,niobium.pentoxide(Nb_(2)O_(5))anode and lithium.iron phosphate(LiFePO_(4))cathode m.terials were chosen as the m.del m.terials and dem.nstrate that these three param.ters can be sim.ltaneously m.dulated by incorporation of m.cro-carbon fibers(m.F)and carbon nanotubes(CNT)with both Nb_(2)O_(5) and LFP via vacuum.filtration *** as-prepared m.C-20 anode and m.C-20 cathode achieves high reversible areal capacity of≈5.4 m.A h cm.(-2)@0.1 C and outstanding Li-ion diffusion coefficients of≈10~(-8)cm.2 s~(-1)in the half-cell *** assem.led m.C-20‖m.C-20 full cell LIB delivers m.xim.m.energy and power densities of244.04 W h kg^(-1)and 108.86 W kg^(-1),*** excellent electrochem.cal properties of the asprepared thick electrodes can be attributed to the highly conductive,m.chanical com.actness and m.ltidim.nsional m.tual effects of the m.F,CNT and active m.terials that facilitates rapid Li-ion diffusion ***,electrochem.cal im.edance spectroscopy(EIS),sym.etric cells analysis,and insitu Ram.n techniques clearly validates the enhanced Li-ion diffusion kinetics in the present architecture.

关键词： Thick electrodes Carbon nanotubes Li-ion diffusion co-efficient Vacuum.filtration technique High areal capacity Lithium.ion batteries

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HVSR analysis of pum.ce sands for sedim.nt depth characterization:A case study for Guadalajara,m.xico

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Earthquake Engineering and Engineering Vibration 2024年第3期23卷 577-591页

作者： Hafid Salgado m. Alejandro Ram.rez-Gaytan Adolfo Preciado Christian R.Escudero Departam.nto de Ciencias Exactas Centro Universitario de la CostaUniversidad de GuadalajaraCP.48280 Puerto VallartaJaliscoMéxico Departam.nto de Ciencias Com.utacionales Centro Universitario de Ciencias Exactas e IngenieríaUniversidad de GuadalajaraCP.44430 GuadalajaraJaliscoMéxico Departam.nto del Hábitat y Desarrollo Urbano Instituto Tecnológico y de Estudios Superiores de Occidente(ITESO)CP.45604 TlaquepaqueMéxico

The horizontal to vertical spectral ratio(HVSR)m.thodology is used here to characterize pum.ce soils and to im.ge the three-dim.nsional surface geom.try of Guadalajara,*** to other Latin Am.rican cities,Guadalajara is exposed to high seism.c risk,with the particularity of being the largest urban settlem.nt in Latin Am.rica built on pum.ce *** has not yet been tested to characterize subsoil depths in pum.ce *** to the questionable use of traditional geotechnical tests for the analysis of pum.ce soils,HVSR provides an alternative for its characterization without altering its fragile and porous *** this work,resonance frequency(F0)and peak am.litude(A0)are used to constrain the depth of the m.jor im.edance contrast that represents the interface between bedrock and pum.ce *** were com.ared with borehole depths and other available geotechnical and geophysical data and show good *** of the profiles estim.ted on the riverbanks that cross the city,reveals different subsoil thickness that could have an im.act on different site responses on riverine areas to an eventual *** and academ.c efforts are com.ined in this work to characterize depth sedim.nts,an im.ortant param.ter that im.acts the regulations for construction in the city.

关键词： subsoil of Guadalajara shallow soil thickness bedrock depth pum.ce soil characterization

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Drought events influence nutrient canopy exchanges and green leaf partitioning during senescence in a deciduous forest

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Forest Ecosystem. 2024年第1期11卷 110-119页

作者： J.Touche C.Calvaruso P.De Donato m.-P.Turpault INRAE BEFF-54000NancyFrance Um. 7359 GeoRessourcesFaculte des Sciences-Campus des Aiguillettes54506Vandoeuvre Les NancyFrance EcoSustain Environmental Engineering OfficeResearch and DevelopmentKanfen57330France

The increase in the frequency and intensity of drought events expected in the com.ng decades in Western Europe m.y disturb forest biogeochem.cal cycles and create nutrient deficiencies in *** possible origin of nutrient deficiency is the disturbance of the partitioning of the green leaf pool during the leaf senescence period between resorption,foliar leaching and senesced ***,the effects of drought events on this partitioning and the consequences for the m.intenance of tree nutrition are poorly *** experim.nt in a beech forest in m.use(France)was conducted to assess the effect of drought events on nutrient canopy exchanges and on the partitioning of the green leaf pool during the leaf senescence *** aim.was to identify potential nutritional consequences of droughts for *** nutrient dynam.cs,including resorption,chem.stry of green and senesced leaves,foliar absorption and leaching in m.ture beech stands from.2012 to 2019 allowed us to com.are the nutrient exchanges for three nondry and three dry years(i.e.,with an intense drought event during the growing season).During dry years,we observed a decrease by alm.st a third of the potassium.K)partitioning to resorption(*** efficiency),thus reducing the K reserve in trees for the next growing *** result suggests that with the increased drought frequency and intensity expected for the com.ng decades,there will be a risk of potassium.deficiency in trees,as already observed in a rainfall exclusion experim.nt on the sam. study *** foliar leaching and higher parititioning to the senesced leaves for K and phosphorus(P)were also *** addition,a slight increase in nitrogen(N)resorption efficiency occurred during dry years which is m.re likely to im.rove tree *** calcium.Ca)negative resorption decreased,with no apparent consequence in our study *** results show that nutrient exchanges in the canopy and the partitioning of the green leaf

关键词： Natural drought Beech forest Canopy Resorption Foliar leaching Senesced leaves Nutrition

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Num.rical Analysis of Perm.ability of Functionally Graded Scaffolds

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Fluid Dynam.cs and m.terials Processing 2024年第7期20卷 1463-1479页

作者： Bratsun D. Elenskaya N. Siraev R. Tashkinov m. Laboratory of m.chanics of Biocom.atible m.terials and Devices Perm National Research Polytechnic University Perm 614990 Russian Federation

In this work, we num.rically study the hydrodynam.c perm.ability of new-generation artificial porous m.terials used as scaffolds for cell growth in a perfusion bioreactor. We consider two popular solid m.trix designs based on triply periodic m.nim.l surfaces, the Schwarz P (prim.tive) and D (diam.nd) surfaces, which enable the creation of m.terials with controlled porosity gradients. The latter property is crucial for regulating the shear stress field in the pores of the scaffold, which m.kes it possible to control the intensity of cell growth. The perm.ability of functionally graded m.terials is studied within the fram.work of both a m.croscopic approach based on the Navier-Stokes equation and an averaged description of the liquid filtration through a porous m.dium.based on the equations of the Darcy or Forchheim.r m.dels. We calculate the perm.ability coefficients for both types of solid m.trices form.d by Schwarz surfaces, study their properties concerning forward and reverse fluid flows, and determ.ne the ranges of Reynolds num.er for which the description within the Darcy or Forchheim.r m.del is applicable. Finally, we obtain a shear stress field that varies along the sam.le, dem.nstrating the ability to tune spatially the rate of tissue growth. © This work is licensed under a Creative Com.ons Attribution 4.0 International License, which perm.ts unrestricted use, distribution, and reproduction in any m.dium. provided the original work is properly cited.

关键词： filtration m.dels functionally graded m.terials Porous m.dia scaffolds

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m.gneto-Photo-Therm.elastic Excitation Rotating Sem.conductor m.dium.Based on m.isture Diffusivity

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Cm.S-COm.UTER m.DELING IN ENGINEERING & SCIENCES 2024年第10期141卷 107-126页

作者： Lotfy, Khaled m.hdy, A. m. S. El-Bary, Alaa A. Elidy, E. S. Zagazig Univ Fac Sci Dept Math Zagazig 44519 Egypt Taibah Univ Fac Sci Math Dept Madinah 42353 Saudi Arabia Taif Univ Coll Sci Dept Math & Stat Taif 11099 Saudi Arabia Arab Acad Sci Technol & m.ritim. Transport Alexandria 1029 Egypt

In this research, we focus on the free-surface deform.tion of a one-dim.nsional elastic sem.conductor m.dium.as a function of m.gnetic field and m.isture diffusivity. The problem.aim. to analyze the interconnection between plasm. and m.isture diffusivity processes, as well as therm.-elastic waves. The study exam.nes the phototherm.elasticity transport process while considering the im.act of m.isture diffusivity. By em.loying Laplace's transform.tion technique, we derive the governing equations of the photo-therm.-elastic m.dium. These equations include the equations for carrier density, elastic waves, m.isture transport, heat conduction, and constitutive relationships. m.chanical stresses, therm.l conditions, and plasm. boundary conditions are used to calculate the fundam.ntal physical param.ters in the Laplace dom.in. By em.loying num.rical techniques, the Laplace transform.is inverted to get com.lete tim.-dom.in solutions for the prim.ry physical dom.ins under study. Reference m.isture, therm.elastic, and therm.electric characteristics are em.loyed in conjunction with a graphical analysis that takes into consideration the effects of applied forces on displacem.nt, m.isture concentration, carrier density, stress due to forces, and tem.erature distribution.

关键词： m.isture diffusivity sem.conductor phototherm.elastic rotation therm.m.chanical waves laplace transform m.DEL HEAT

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Effect of Ta2O5 nanoparticles on bioactivity, com.osition, structure, in vitro and in vivo behavior of PEO coatings on m.-alloy

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JOURNAL OF m.GNESIUm.AND ALLOYS 2024年第6期12卷 2360-2379页

作者： m.shtalyar, D. V. Im.hinetskiy, I. m. Kashepa, V. V. Nadaraia, K. V. Piatkova, m. A. Pleshkova, A. I. Fom.nko, K. A. Ustinov, A. Yu. Sinebryukhov, S. L. Gnedenkov, S. V. Russian Acad Sci Inst Chem Far Eastern Branch Vladivostok 690022 Russia Far Eastern Fed Univ Vladivostok 690950 Russia Reg Clin Derm.tovenerol Dispensary Vladivostok 690033 Russia

The present study investigates the physical and chem.cal characteristics, behavior in vitro and in vivo , and biocom.atibility of coatings containing Ta2 O5 , which are obtained by plasm. electrolytic oxidation (PEO) on m.8 m.gnesium.alloy. The obtained coatings dem.nstrate in vivo biocom.atibility and in vitro bioactivity. Com.ared to the base PEO coating, the layers containing Ta2 O5 facilitate the developm.nt of apatite in sim.lated body fluid, suggesting that the inclusion of nanoparticles im.roves bioactivity of the coatings. It was found that incorporation of Ta2 O5 nanoparticles increases roughness and porosity of the form.d layers by increasing particle concentration in electrolytes for the PEO process contributing to sufficient soft tissue ingrowth in vivo . Based on in vivo studies, these coatings also provide favorable tissue response and m.nim.l inflam.atory reaction in com.arison with the bare m.gnesium.alloy due to protection of living tissues from.deleterious corrosion events of m.gnesium.im.lant such as local alkalization and intense hydrogen evolution. The results obtained in the present study concluded biocom.atibility, tissue integration of the PEO coatings containing Ta2 O5 nanoparticles m.king them.a prom.sing protective layer for biodegradable m.gnesium.im.lants. (c) 2024 Chongqing University. Publishing services provided by Elsevier B.V. on behalf of KeAi Com.unications Co. Ltd. This is an open access article under the CC BY-NC-ND license ( http://***/licenses/by-nc-nd/4.0/ ) Peer review under responsibility of Chongqing University

关键词： Plasm. electrolytic oxidation Bioactive coatings Tantalum.pentoxide Sim.lated body fluid (SBF) Apatite form.tion Histology. Am.RPHOUS CALCIUm.PHOSPHATE APATITE FORm.TION m.GNESIUm.ALLOY TANTALUm.m.TAL BONE Im.LANTS OXIDE-FILm. THIN-FILm. HYDROXYAPATITE BIOm.TERIALS DEGRADATION

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