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具有BCC或f.C晶体结构的固溶体高熵合金设计

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材料工程 2024年第1期52卷 16-26页

作者： HORBAN V.f. 乌克兰国家科学院弗兰采维奇材料问题研究所乌克兰基辅03680

高熵合金最初报道于21世纪初期,该类合金具有较高的混合熵值,使其具有优异的热稳定性;较大的晶格畸变,产生了强烈固溶强化效果;较大的负焓值导致在晶粒内部形成团簇结构,有效阻碍了位错运动,进一步提高了合金强度。高熵合金独有的这些特... 详细信息

高熵合金最初报道于21世纪初期,该类合金具有较高的混合熵值,使其具有优异的热稳定性;较大的晶格畸变,产生了强烈固溶强化效果;较大的负焓值导致在晶粒内部形成团簇结构,有效阻碍了位错运动,进一步提高了合金强度。高熵合金独有的这些特性,使其在低温和高温条件下均有望表现出优异的物理性能和力学性能,引起了广泛的关注,研究报道呈爆发性增长。本文根据已有的BCC和f.C结构高熵合金物理-力学性能数据,分析了电子浓度、晶格常数、原子错配度、混合焓、硬度、弹性模量和归一化硬度等参数之间的关系,提出了BCC和f.C晶体结构的高熵合金弹性模量和硬度的经验计算公式,在此基础之上,综合考虑合金密度、塑性和服役工况等条件,提出了BCC和f.C结构的高熵合金成分设计方法。最后指出高熵合金的持久性能、大尺寸铸锭的成分和性能均匀性以及大尺寸合金锭的制备是高熵合金工程应用需解决的关键问题。

关键词：高熵合金电子浓度晶格常数晶格畸变混合焓硬度弹性模量归一化硬度

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Stochastic seismic inversion and Bayesian f.cies classif.cation applied to porosity modeling and igneous rock identif.cation

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Petroleum Science 2024年第2期21卷 918-935页

作者： f.bio Júnior Damasceno f.rnandes Leonardo Teixeira Antonio f.rnando Menezes f.eire Wagner Moreira Lupinacci Exploratory Interpretation and Reservoir Characterization Group(GIECAR) Department of Geology and GeophysicsFederal Fluminense UniversityNiter oiRJ24210-346Brazil Petrobras Rio de JaneiroRJ20231-030Brazil National Institute of.Science and Technology of.Petroleum Geophysics(INCT-GP/CNPQ) Niter oiRJ24210-346Brazil

We apply stochastic seismic inversion and Bayesian f.cies classif.cation f.r porosity modeling and igneous rock identif.cation in the presalt interval of.the Santos Basin. This integration of.seismic and well-derived inf.rmation enhances reservoir characterization. Stochastic inversion and Bayesian classif.cation are powerf.l tools because they permit addressing the uncertainties in the model. We used the ES-MDA algorithm to achieve the realizations equivalent to the percentiles P10, P50, and P90 of.acoustic impedance, a novel method f.r acoustic inversion in presalt. The f.cies were divided into f.ve: reservoir 1,reservoir 2, tight carbonates, clayey rocks, and igneous rocks. To deal with the overlaps in acoustic impedance values of.f.cies, we included geological inf.rmation using a priori probability, indicating that structural highs are reservoir-dominated. To illustrate our approach, we conducted porosity modeling using f.cies-related rock-physics models f.r rock-physics inversion in an area with a well drilled in a coquina bank and evaluated the thickness and extension of.an igneous intrusion near the carbonate-salt interf.ce. The modeled porosity and the classif.ed seismic f.cies are in good agreement with the ones observed in the wells. Notably, the coquinas bank presents an improvement in the porosity towards the top. The a priori probability model was crucial f.r limiting the clayey rocks to the structural lows. In Well B, the hit rate of.the igneous rock in the three scenarios is higher than 60%, showing an excellent thickness-prediction capability.

关键词： Stochastic inversion Bayesian classif.cation Porosity modeling Carbonate reservoirs Igneous rocks

Pre-intercalation: A valuable approach f.r the improvement of.post-lithium battery materials

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eScience 2024年第2期4卷 28-42页

作者： Charlie A.f.Nason Yang Xu Department of.Chemistry University College LondonLondonWC1H 0AJUK

With the growing concern around the sustainability and supply of.lithium,the need f.r alternative rechargeable energy storage technologies has become ever more ***-,potassium-,magnesium-,and zinc-ion batteries are f.st becoming viable alternatives but are held back by capacity,rate and stability problems that have not developed comparably to lithium-ion *** overcome these shortcomings and reduce the reliance on lithium,electrode materials used f.r these post-lithium batteries must be ***-intercalation of.f.reign species into the lattice of.promising electrode materials can enhance their electrochemical perf.rmance in comparison to the un-pre-intercalated counterparts,closing the perf.rmance gap with lithium-ion *** review article covers the common methods of.pre-intercalating f.reign species into electrode materials,the resulting structural ef.ects and the improvements that are observed in the materials'electrochemical perf.rmance f.r post-lithium *** and impactf.l work reported previously are summarised as examples of.these improvements,demonstrating the value and ever-growing importance of.pre-intercalation in today's battery landscape.

关键词： Intercalation Post-lithium Batteries Energy storage Electrode materials Ion dif.usion Active sites

Proposed numerical and machine learning models f.r f.ber-reinf.rced polymer concrete-steel hollow and solid elliptical columns

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f.ontiers of.Structural and Civil Engineering 2024年第8期18卷 1169-1194页

作者： Tang QIONG Ishan JHA Alireza BAHRAMI Haytham f.ISLEEM Rakesh KUMAR Pijush SAMUI School of.Applied Technologies Qujing Normal UniversityQujing 655011China Department of.Civil Engineering Indian Institute of Technology-BHUVaranasi 221005India Department of.Building Engineering Energy Systems and Sustainability ScienceFaculty of Engineering and Sustainable DevelopmentUniversity of GävleGävle 80176Sweden Department of.Civil Engineering National Institute of Technology-PatnaPatna 800005India

This study employs a hybrid approach,integrating f.nite element method(f.M)simulations with machine learning(ML)techniques to investigate the structural perf.rmance of.double-skin tubular columns(DSTCs)reinf.rced with glass f.ber-reinf.rced polymer(Gf.P).The investigation involves a comprehensive examination of.critical parameters,including aspect ratio,concrete strength,number of.Gf.P conf.nement layers,and dimensions of.steel tubes used in DSTCs,through comparative analyses and parametric *** ensure the credibility of.the f.ndings,the results are rigorously validated against experimental data,establishing the precision and trustworthiness of.the *** present research work examines the use of.the columns with elliptical cross-sections and contributes valuable insights into the application of.f.M and ML in the design and evaluation of.structural systems within the f.eld of.structural engineering.

关键词： elliptical column f.ber-reinf.rced polymer machine learning f.nite element method ABAQUS

SnRK1a1, a new player in the sucrose-Opaque2 network during endosperm f.lling

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Molecular Plant 2024年第8期17卷 1172-1174页

作者： Kelly Mayrink Balmant Marcio f.R.Resende Jr. Horticultural Sciences Department University of FloridaGainesvilleFLUSA

Maize(Zea mays)endosperm is an important f.od source f.r humans and *** addition,it is considered an excellent model f.r research on seed development because of.its relatively large size f.r both embryo and endosperm compared to those of.other crop species,such as rice(Oryza sativa)and wheat(Triticum aestivum).Af.er double f.rtilization,early maize endosperm development includes three stages:(i)a multinucleate coenocyte stage;(i)a cellularization stage,in which the cellular endosperm is f.rmed;and(ii)a stage of.dif.erentiation into distinct *** early dif.erentiation,f.ur major cell types with specif.c f.nctions dif.erentiate within the endosperm:starchy endosperm,aleurone layer,basal endosperm transf.r layer(BETL),and embryo surrounding *** subaleurone,conducting zone,basal intermediate zone,and endosperm adjacent to scutellum arise in late dif.erentiation(Sabelli and Larkins 2009).Af.er the main cell types are established,maize endosperm undergoes intensive cell prolif.ration,which marks the transition to the endosperm-f.lling *** the endosperm-f.ling stage,the maternal sucrose products are transported to seeds through the BETL region,where they will act as the main carbon substrate f.r storage products such as starch and proteins(Chen et al.,2023).In f.ct,the endosperm of.maize seeds accounts f.r approximately 90%of.the total grain weight,serving as an important nutrient reservoir(f.int-Garcia et al.,2009).

关键词： endosperm reservoir f.int

miniSCIDOM: a scintillator-based tomograph f.r volumetric dose reconstruction of.single laser-driven proton bunches

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High Power Laser Science and Engineering 2024年第2期12卷 41-50页

作者： A.Corvino M.Reimold E.Beyreuther f.-E.Brack f.Kroll J.Pawelke J.D.Schilz M.Schneider U.Schramm M.E.P.Umlandt K.Zeil T.Ziegler J.Metzkes-Ng Helmholtz-Zentrum Dresden–Rossendorf DresdenGermany Technische Universität Dresden DresdenGermany OncoRay–National Center f.r Radiation Research in Oncology Faculty of Medicine and University Hospital Carl Gustav CarusTUD Dresden University of TechnologyHelmholtz-Zentrum Dresden–RossendorfDresdenGermany Current af.iliation:Institut Curie UniversitéPSLCNRS UMR3347OrsayFrance Current af.iliation:Universitätsklinikum f.eiburg FreiburgGermany

Laser plasma accelerators(LPAs)enable the generation of.intense and short proton bunches on a micrometre scale,thus of.ering new experimental capabilities to research f.elds such as ultra-high dose rate radiobiology or material *** spectrally broadband,laser-accelerated proton bunches allow f.r tailored volumetric dose deposition in a sample via single bunches to excite or probe specif.c sample *** rising number of.such experiments indicates a need f.r diagnostics providing spatially resolved characterization of.dose distributions with volumes of.approximately 1 cm^(3) f.r single proton bunches to allow f.r f.st online *** we present the scintillator-based miniSCIDOM detector f.r online single-bunch tomographic reconstruction of.dose distributions in volumes of.up to approximately 1 cm^(3).The detector achieves a spatial resolution below 500μm and a sensitivity of.100 *** detector perf.rmance is tested at a proton therapy cyclotron and an LPA proton *** experiments’primary f.cus is the characterization of.the scintillator’s ionization quenching behaviour.

关键词： beam monitoring detectors laser-driven proton beams scintillator-based diagnostics ultra-high dose rate

Ef.ects of.dust controls on respirable coal mine dust composition and particle sizes:case studies on auxiliary scrubbers and canopy air curtain

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International Journal of.Coal Science & Technology 2024年第3期11卷 86-101页

作者： f.Animah C.Keles W.R.Reed E.Sarver Department of.Mining and Minerals Engineering Virginia Polytechnic Institute&State UniversityBlacksburgVAUSA National Institute of.Occupational Saf.ty and Health(NIOSH) PittsburghPAUSA

Control of.dust in underground coal mines is critical f.r mitigating both saf.ty and health *** decades,the National Institute of.Occupational Saf.ty and Health(NIOSH)has led research to evaluate the ef.ectiveness of.various dust control technologies in coal *** studies have included the evaluation of.auxiliary scrubbers to reduce respirable dust downstream of.active mining and the use of.canopy air curtains(CACs)to reduce respirable dust in key operator *** detailed dust characterization was not a f.cus of.such studies,this is a growing area of.*** preserved f.lter samples f.om three previous NIOSH studies,the current work aims to explore the ef.ect of.two dif.erent scrubbers(one wet and one dry)and a roof.bolter CAC on respirable dust composition and particle size *** this,the preserved f.lter samples were analyzed by thermogravimetric analysis and/or scanning electron microscopy with energy dispersive *** indicate that dust composition was not appreciably af.ected by either scrubber or the ***,the wet scrubber and CAC appeared to decrease the overall particle size *** an ef.ect of.the dry scrubber was not consistently observed,but this is probably related to the particular sampling location downstream of.the scrubber which allowed f.r signif.cant mixing of.the scrubber exhaust and other return *** f.om the insights gained with respect to the three specif.c dust control case studies revisited here,this work demonstrates the value of.preserved dust samples f.r f.llow-up investigation more broadly.

关键词： Respirable dust Dust control SEM–EDX Scrubber Canopy air curtain Silica

Converting TREx-RGB green-channel data to 557.7 nm auroral intensity:Methodology and initial results

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Earth and Planetary Physics 2024年第1期8卷 258-274页

作者： Jun Liang D.M.Gillies E.Spanswick E.f.Donovan University of.Calgary CalgaryT2N 1N4Canada

The recently deployed Transition Region Explorer(TREx)-RGB(red-green-blue)all-sky imager(ASI)is designed to capture“true color”images of.the aurora and *** the 557.7 nm green line is usually the brightest emission line in visible auroras,the green channel of.a TREx-RGB camera is usually dominated by the 557.7 nm *** this rationale,the TREx mission does not include a specif.c 557.7 nm imager and is designed to use the RGB green-channel data as a proxy f.r the 557.7 nm *** this study,we present an initial ef.ort to establish the conversion ratio or f.rmula linking the RGB green-channel data to the absolute intensity of.557.7 nm auroras,which is crucial f.r quantitative uses of.the RGB *** illustrate two approaches:(1)through a comparison with the collocated measurement of.green-line auroras f.om the TREx spectrograph,and(2)through a comparison with the modeled green-line intensity according to realistic electron precipitation f.ux measurements f.om low-Earth-orbit satellites,with the aid of.an auroral transport *** demonstrate the procedures and provide initial results f.r the TREx-RGB ASIs at the Rabbit Lake and Lucky Lake *** RGB response is f.und to be *** conversion ratios or f.rmulas between RGB green-channel data and the green-line auroral intensity are given and can be applied immediately by TREx-RGB data *** methodology established in this study will also be applicable to the upcoming SMILE ASI mission,which will adopt a similar RGB camera system in its deployment.

关键词： TREx RGB green-line aurora auroral transport model

Assembly structures of.coastal woody species of.eastern South America:Patterns and drivers

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Plant Diversity 2024年第5期46卷 611-620页

作者： Eduardo Vinícius da Silva Oliveira Myrna f.iederichs Landim Sidney f.Gouveia Graduate Program in Ecology and Conservation Federal University of SergipeSão CristovãoSergipeBrazil National Institute of.Science and Technology Ecology Evolution and Conservation of Biodiversity(INCT-EECBio)GoiâniaGoiasBrazil Department of.Biology Federal University of SergipeSão CristóvãoSergipeBrazil Department of.Ecology Federal University of SergipeSão CristóvãoSergipeBrazil

Tropical regions have provided new insights into how ecological communities are *** dry coastal communities,water stress has been hypothesized to determine plant assembly structure by f.voring preadapted lineages f.om neighboring ecosystems,consistent with f.nctional ***,it is unclear whether this hypothesis is suf.icient to explain how coastal communities in tropical ecosystems are ***,we test whether water stress or other f.ctors drive community assembly in woody plant communities across the coastal zone of.Brazil,a tropical *** characterized f.nctional and phylogenetic structures of.these communities and determined the underlying environmental f.ctors(e.g.,water stress,historical climate stability,edaphic constraints,and habitat heterogeneity)that drive their community *** of.coastal woody species show geographically varied patterns,including stochastic arrangements,clustering,and overdispersion of.species relative to their traits and phylogenetic *** complexity,water vapor pressure,and soil nutrient availability best explained the gradient in the f.nctional *** def.cit,water vapor pressure,and soil organic carbon were the best predictors of.variation in phylogenetic *** results support the water-stress conservatism hypothesis on f.nctional and phylogenetic structure,as well as the ef.ect of.habitat heterogeneity on f.nctional structure and edaphic constraints on f.nctional and phylogenetic *** ef.ects are associated with increased phenotypic and phylogenetic divergence of.woody plant assemblages,which is likely mediated by abiotic f.ltering and niche opportunities,suggesting a complex pattern of.ecological assembly.

关键词： Brazil Completeness Clustering Restinga vegetation Water constraints