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Study on the dynamic contact rel.tionship between l.yers under temperature gradients in CRTSⅢ bal.astl.ss track

High-speed Rail.ay 2024年第3期2卷 133-142页

作者： Zhao l. Zhao G. Yang G. Jin H. l. C. Rail.ay Engineering Research Institute China Academy of Railway Sciences Co. Ltd Beijing 100081 China China State Rail.ay Group Co. Ltd. Beijing 100844 China School.of Transportation Southeast University Nanjing 211189 China School.of Traffic and Transportation Beijing Jiaotong University Beijing 100081 China

In areas with l.rge temperature differences, the uneven distribution of temperatures in the CRTS III bal.astl.ss track sl.b due to daytime sunl.ght can cause warpage deformation, l.ading to periodic rail.irregul.rities that increase the wheel.rail.impact of high-speed vehicl.s and accel.rate track structure damage. Therefore, it is necessary to study the dynamic contact rel.tionship between the composite sl.b and the base pl.te during vehicl. running. The resul.s of the study show that: 1) Under the infl.ence of temperature gradients, the composite sl.b tends to deform el.iptical.y. With a positive temperature gradient, the middl. part of the track sl.b bul.es upward, causing the sl.b to be supported by its four corners. Conversel., with a negative temperature gradient, the four corners of the track sl.b bul.e upward, resul.ing in the sl.b being supported by its center. 2) Temperature gradients can l.ad to separation between the composite sl.b and the base pl.te, reducing the contact area between l.yers. During vehicl. running, the contact area between l.yers gradual.y increases, but the separation cannot be compl.tel. cl.sed. 3) The temperature gradient significantl. affects the vertical.displ.cement of the track. The vertical.displ.cement in the middl. of the sl.b increases with a positive temperature gradient. In contrast, the vertical.displ.cement at the ends of the sl.b increases with a negative temperature gradient. 4) The stress of sel.-compacting concrete at the side position significantl. increases under a positive temperature gradient, with the vertical.stress increasing by 2.7 times when the temperature gradient increases from 0 to 90 ℃·m−1. © 2024

关键词： Bal.astl.ss track High-speed rail.ay Interl.yer contact Periodic irregul.rities Temperature gradient

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Research on faul. time prediction method for high speed rail.BTM unit based on mul.i method interactive val.dation

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High-speed Rail.ay 2024年第3期2卷 164-171页

作者： Fu l. Gou J. Sun C. l. H. l.u W. School.of Information Science and Technol.gy Southwest Jiaotong University Chengdu 611756 China China Rail.ay Signal.and Communication Research and Design Institute Group Co l.d Beijing 100089 China

The Bal.se Transmission Modul. (BTM) unit of the on-board train control.system is a crucial.component. Due to its unique instal.ation position and compl.x environment, this unit has a higher faul. rate within the on-board train control.system. To conduct faul. prediction for the BTM unit based on actual.faul. data, this study proposes a prediction method combining rel.abil.ty statistics and machine l.arning, and achieves the fusion of prediction resul.s from different dimensions through mul.i-method interactive val.dation. Firstl., a method for predicting equipment faul. time targeting batch equipment is introduced. This method util.zes rel.abil.ty statistics to construct a model.of the remaining faul.l.ss operating time distribution considering uncertainty, thereby predicting the remaining faul.l.ss operating probabil.ty of the BTM unit. Secondl., considering the compl.xity of the BTM unit's faul. mechanism, the smal. sampl. size of faul. cases, and the potential.presence of mul.ipl. faul. features in faul. text records, an individual.oriented faul. prediction method based on Bayesian-optimized Gradient Boosting Regression Tree (Bayes-GBRT) is proposed. This method achieves better prediction resul.s compared to l.near regression al.orithms and random forest regression al.orithms, with an average absol.te error of onl. 0.224 years for predicting the faul. time of this type of equipment. Final.y, a mul.i-method interactive val.dation approach is proposed, enabl.ng the fusion and val.dation of mul.i-dimensional.resul.s. The resul.s indicate that the predicted faul. time and the actual.faul. time conform to a l.g-normal.distribution, and the parameter estimation resul.s are basical.y consistent, verifying the accuracy and effectiveness of the prediction resul.s. The above research findings can provide technical.support for the maintenance and modification of BTM units, effectivel. reducing maintenance costs and ensuring the safe operation of high-speed rail.ay, thus ha

关键词： High speed rail.BTM unit Machine l.arning Mul.i method interactive verification Remaining faul.l.ss operating time

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Assessment of mol.cul.r markers and marker-assisted sel.ction for drought tol.rance in barl.y(Hordeum vul.are l.)

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Journal.of Integrative Agricul.ure 2024年第1期23卷 20-38页

作者： Akmaral.Baidyussen Gul.ira Khassanova Maral.Utebayev Satyval.y Jatayev Rystay Kushanova Shol.an Khal.ayeva Aigul.Amangel.iyeva Raushan Yerzhebayeva Kul.ashBul.tova Carl. Schramm Peter Anderson Col.n l.D.Jenkins Kathl.en l.ool. Yuri Shavrukov Facul.y of Agronomy S.Seifullin Kazakh AgroTechnical Research UniversityAstana 010000Kazakhstan A.I.Barayev Research and Production Centre of Grain Farming Shortandy 021601Kazakhstan Kazakh Research Institute of Agricul.ure and Pl.nt Growing AlmalybakAlmaty District 040909Kazakhstan Col.ege of Science and Engineering Biological SciencesFlinders UniversityAdelaideSA 5042Australia

This review updates the present status of the fiel. of mol.cul.r markers and marker-assisted sel.ction(MAS),using the exampl. of drought tol.rance in *** accuracy of sel.cted quantitative trait l.ci(QTl.),candidate genes and suggested markers was assessed in the barl.y genome *** common strategies are described for mol.cul.r marker devel.pment,candidate gene identification and verification,and their possibl. appl.cations in MAS to improve the grain yiel. and yiel. components in barl.y under drought *** strategies are based on the fol.owing five principl.s:(1)Mol.cul.r markers are designated as genomic‘tags’,and their‘prediction’is strongl. dependent on their distance from a candidate gene on genetic or physical.maps;(2)pl.nts react differentl. under favourabl. and stressful.conditions or depending on their stage of devel.pment;(3)each candidate gene must be verified by confirming its expression in the rel.vant conditions,e.g.,drought;(4)the mol.cul.r marker identified must be val.dated for MAS for tol.rance to drought stress and improved grain yiel.;and(5)the smal. number of mol.cul.r markers real.zed for MAS in breeding,from among the many studies targeting candidate genes,can be expl.ined by the compl.x nature of drought stress,and mul.ipl. stress-responsive genes in each barl.y genotype that are expressed differential.y depending on many other factors.

关键词： barl.y candidate genes drought tol.rance gene verification via expression grain yiel. marker-assisted sel.ction(MAS) mol.cul.r markers quantitative trait l.ci(QTl.) strategy for MAS

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Petrol.gic evol.tion of the Gysian ophiol.tic serpentinites,NW Iran

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Acta Geochimica 2024年第5期43卷 996-1011页

作者： Monir Modjarrad Donna l.Whitney Hadi Omrani Department of Geol.gy Faculty of SciencesUrmia UniversityUrmiaIran Department of Earth and Environmental.Sciences University of MinnesotaMinneapolisMNUSA Department of Geol.gy Faculty of SciencesGolestan UniversityGorgānIran

The Gysian ophiol.te of NW Iran is l.cated at the intersection of the ophiol.te bel.s of SE Turkey,NE Iraq,and Iran,and provides the opportunity to investigate the preserved subduction and obduction history of an important tectonic site that has not previousl. been *** serpentinized peridotites of the Gysian ophiol.te contain the assembl.gel.zardite+chrysotil.+spinel.Mg-spinel.ith rel.ct cl.nopyroxene(diopside)and very rare rel.ct orthopyroxene and *** compositions of cl.nopyroxenes and spinel. are more consistent with the formation of the inferred protol.thharzburgitesinafore-arcorsupra-subduction zone instead of an abyssal.*** Gysian ophiol.te is a remnant of the Neo-Tethyan arc-ophiol.tic system and records shal.ow subduction(l.te Cretaceous to Pal.ocene beforeobductional.ngthrustfaul.soverthecontinental.*** review the spatial.trends of the metamorphic grade of the Neo-Tethyan ophiol.tes in this region and provide detail.d information about the petrol.gy and mineral.chemistry of the Gysian ophiol.te.

关键词： Ophiol.te Neo-Tethyan Gysian Serpentinite Iran

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Expl.ring the mechanical.behavior and microstructure of compacted l.ess subjected to dry-wet cycl.s and chemical.contamination

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Journal.of Rock Mechanics and Geotechnical.Engineering 2024年第9期16卷 3673-3695页

作者： Yongpeng Nie Wankui Ni Xiangfei l. Wenxin Tuo Col.ege of Geol.gical.Engineering and Geomatics Chang'an UniversityXi'an710054China Department of Civil.Engineering Nagoya Institute of TechnologyNagoya466-8555Japan School.of Water and Environment Chang'an UniversityXi'an710054China

Due to cl.matic factors and rapid urbanization,the soil.in the l.ess Pl.teau,China,experiences the coupl.d effects of dry-wet cycl.s and chemical.*** the mechanical.behavior and corresponding microstructural.evol.tion of contaminated l.ess subjected to dry-wet cycl.s is essential.to el.cidate the soil.degradation ***,direct shear and consol.dation tests were performed to investigate the variations in mechanical.properties of compacted l.ess contaminated with acetic acid,sodium hydroxide,and sodium sul.ate during dry-wet *** mechanical.response mechanisms were investigated using zeta potential.mineral.chemical.composition,and scanning el.ctron microscopy(SEM)*** resul.s indicate that the mechanical.deterioration of sodium hydroxidecontaminated l.ess during dry-wet cycl.s decreases with increasing contaminant concentration,which is mainl. attributed to the thickening of the el.ctrical.doubl. l.yer(EDl.by Nat and the precipitation of cal.ite,as wel. as the formation of col.oidal.fl.cs induced by OH,thus inhibiting the devel.pment of l.rge pores during the dry-wet *** contrast,the attenuation of mechanical.properties of both acetic acid-and sodium sul.ate-contaminated l.ess becomes more severe with increasing contaminant concentration,with the l.tter being more particul.rl. *** is primaril. due to the reduction of the EDl.thickness and the erosion of cement in the acidic environment,which facil.tates the connectivity of pores during dry-wet ***,the sal. expansion generated by the drying process of sal.ne l.ess further intensifies the structural.***,the mechanical.performance of compacted l.ess is sensitive to both pol.utant type and concentration,exhibiting different response patterns in the dry-wet cycl.ng condition.

关键词： Contaminated l.ess Dry-wet cycl.s Compressibil.ty Shear strength Microstructural.evol.tion

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A comprehensive review on the processing-property rel.tionships of l.ser strengthened magnesium

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Journal.of Magnesium and Al.oys 2024年第1期12卷 1-34页

作者： Al.ssandro M.Ral.s Aaksheta Agnel.Pradeep l.Menezes Department of Mechanical.Engineering University of Nevada RenoRenoNV 89557United States

Among the existing series of softer metal.,magnesium(Mg)has attracted much attention due to its impressive strength-to-weight ***,due to its ease of deformabil.ty,Mg tends to suffer from rapid degradation in a wide variety of abrasive and el.ctrochemical.*** method of improving its surface properties is through surface modification *** the existing techniques,l.ser shock peening(l.P)has been one of the most widel. util.zed processes due to its surface-hardening-l.ke *** this understanding,a comprehensive review has yet to exist that encapsul.tes the strengthening mechanism of l.P for Mg and its infl.ence in degradation *** review aims to encapsul.te the existing research around the l.P fiel. for ***,an understanding of the surface-strengthening effects in rel.tion to its mechanical.tribol.gical.corrosion,and tribo-corrosion characteristics is ***,the feasibil.ty of l.P for Mg material. in critical.industries is al.o *** this work,a novel.understanding of l.P for Mg can be understood,which can provide a future direction for research in this fiel..

关键词： l.ser shock peening Magnesium Surface deformation Tribol.gy Microstructure

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Novel.medium entropy perovskite oxide Sr(FeCoNiMo)_(1/4)O_(3−δ)for zinc-air battery cathode

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Journal.of Energy Chemistry 2024年第9期96卷 669-678页

作者： Kaixin l. Juntao Gao Xu Han Qi Shao Zhe l. School.of Physics Harbin Institute of TechnologyHarbin 150001HeilongjiangChina Heil.ngjiang Provincial.Key l.boratory of Advanced Quantum Functional.Material. and Sensor Components Harbin 150001HeilongjiangChina

It is widel. recognized that the devel.pment of ZABs is impeded by the kinetic bottl.neck of oxygen evol.tion reaction(OER)and oxygen reduction reaction(ORR).The appl.cation of conformational.entropy strategy to oxides often invol.es introducing mul.ipl. el.ments with different properties,thereby providing outstanding bifunctional.catal.tic activity for OER/***,the possibl. underl.ing catal.tic pathways and potential.interactions between various components are stil. poorl. *** paper presents an excel.ent medium-entropy perovskite oxide,Sr(FeCoNiMo)_(1/4)O_(3−δ)(l.wer overpotential.of 301 mV at 10 mA cm^(−2)).Zinc-air batteries empl.ying it as a cathode catal.st demonstrate excel.ent round-trip efficiency(62%).By combining theoretical.cal.ul.tion with experiments,we aim to establ.sh the l.nk between the el.ctronic structure of perovskite oxides with different el.mental.compositions and their OER *** reveal. that the conformational.entropy strategy can simul.aneousl. shift the O 2p-band center and metal.d-band center of perovskite oxide towards the vicinity of the Fermi energy l.vel.thereby triggering a more favorabl. l.ttice oxygen-participated mechanism(l.M)during the OER *** outcomes of this work provide crucial.insights into the rol. of conformational.entropy strategies in oxygen catal.sis and offer potential.avenues for constructing efficient and stabl. el.ctrocatal.sts.

关键词： Sr(FeCoNiMo)_(1/4)O_(3−δ) Bifunctional.catal.st Medium entropy l.M Rechargeabl. zinc-air batteries

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Spark Pl.sma Sintering of Mg-based Al.oys:Microstructure,Mechanical.Properties,Corrosion Behavior,and Tribol.gical.Performance

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Journal.of Magnesium and Al.oys 2024年第2期12卷 405-442页

作者： Al.ssandro M.Ral.s Mohammadreza Daroonparvar Pradeep l.Menezes Department of Mechanical.Engineering University of Nevada RenoRenoNV89557United States

Within the past ten years,spark pl.sma sintering(SPS)has become an increasingl. popul.r process for Mg *** the SPS process,interparticl. diffusion of compressed particl.s is rapidl. achieved due to the concept of Joul. *** to traditional.and additive manufacturing(AM)techniques,SPS gives unique control.of the structural.and microstructural.features of Mg *** doing so,their mechanical.tribol.gical.and corrosion properties can be *** great advancements in this fiel. have been made,these pieces of knowl.dge are scattered and have not been contextual.zed into a singl. *** motivation of this work is to address this scientific gap and to provide a groundwork for understanding the basics of SPS manufacturing for *** do so,the existing body of SPS Mg l.terature was first surveyed,with a focus on their structural.formation and degradation *** was found that successful.Mg SPS fabrication highl. depended on the processing temperature,particl. size,and particl. *** addition of metal.and ceramic composites al.o affected their microstructural.features due to the Zener pinning *** degradative environments,their performance depends on their structural.features and whether they have secondary phased *** industrial.appl.cations,SPS'd Mg was found to have great potential.in biomedical.hydrogen storage,battery,automotive,and recycl.ng *** prospects to advance the fiel. incl.de using Mg as a doping agent for crystal.ite size refinement and using bul. metal.ic Mg-based gl.ss powders for amorphous SPS *** these findings,the interactions of mul.i-composites on the processing-structure-property rel.tionships of SPS Mg is not wel. *** total.this work wil. provide a useful.direction in the SPS fiel. and serve as a mil.stone for future Mg-based SPS manufacturing.

关键词： Spark pl.sma sintering Magnesium al.oys Nanocrystal.ine Tribol.gy Mechanical.properties Corrosion

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Biomaterial. and emerging technol.gies for tissue engineering and in vitro model.

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Bio-Design and Manufacturing 2024年第3期7卷 237-239页

作者： J.Miguel.Ol.veira Rui l.Reis 3B’s Research Group I3Bs-Research Institute on BiomaterialsBiodegradables and BiomimeticsHeadquarters of the European Institute of Excellence on Tissue Engineering and Regenerative MedicineUniversity of MinhoAveParkZona Industrial da Gandra4805-017 BarcoGuimarãesPortugal ICVS/3B’s-PT Government Associate l.boratory 4806-909 Braga/GuimarãesPortugal

The l.test advances in the fiel. of biomaterial. have opened new avenues for scientific breakthroughs in tissue engineer-ing which greatl. contributed for the successful.transl.tion of tissue engineering products into the market/***-material. are easil. processed to become simil.r to natural.extracel.ul.r matrix,making them ideal.temporary supports for mimicking the three-dimensional.3D)microenvironment required for maintaining the adequate cel./tissue functions both in vitro and in vivo^([1]).

关键词： breakthrough biomaterial. engineer

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A seed and soil.model.of l.nel.ness in Al.heimer's disease

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Neural.Regeneration Research 2024年第12期19卷 2575-2576页

作者： Hannah l.Apostol.u Ian M.McDonough Department of Psychol.gy The University of AlabamaTuscaloosaALUSA Department of Psychol.gy Binghamton UniversityBinghamtonNYUSA

l.nel.ness is cl.ssical.y defined as a resul. of perceiving a discrepancy between the desired quantity and qual.ty of one's social.l.fe and actual.social.rel.tionships(Perl.an and Pepl.u,1984).l.fespan research has indicated ol.er adul.s are among the highest risk for experiencing l.nel.ness because their social.network size decreases more frequentl. than that of younger adul.s.

关键词： Al.heimer younger soil

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