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Revealing microstructural evolution and mechanical properties of resistance spot welded NiTi-stainless steel with Ni or Nb interlayer

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journal of Materials Science & Technology 2024年第13期180卷 160-173页

作者： K.Zhang A.Shamsolhodaei A.Ghatei-Kalashami j.p.Oliveira C.Zang N.Schell j.Li A.R.H.Midawi j.G.Lopes j.Yan p.e.j.rivera-díaz-del-castillo p.peng Y.N.Zhou department of Mechanical and Mechatronics engineering University of Waterloo200 University Avenue WestWaterlooONN2L 3G1Canada CeNIMAT/I3N Department of Materials ScienceNOVA School of Science and TechnologyUniversidade NOVA de Lisboa2829-516CaparicaPortugal Materials Research Group Department of Mechanical EngineeringUniversity of SouthamptonSouthamptonSO171BJUK Helmholtz-Zentrum Hereon Institute of Materials PhysicsMax-Planck-Str.1Geesthacht21502Germany UNIdeMI Department of Mechanical and Industrial EngineeringNOVA School of Science and TechnologyUniversidade NOVA de Lisboa2829-516CaparicaPortugal

dissimilar welding of NiTi and stainless steel(SS)for multifunctional device fabrication is challenging due to the brittle nature of intermetallic compounds(IMCs)that are formed in the weld *** this work,Ni and Nb interlayers were applied for the resistance spot welding(RSW)of NiTi and SS to replace the harmful Fe_(2)Ti phase and to restrict the mixing of dissimilar molten metals,*** evolution and mechanical properties of the joints were *** was shown that a conventional weld nugget was created in the absence of any interlayer in the welded joint suffering from traversed cracks due to the formation of brittle IMCs network in the fusion zone(FZ).By the addition of Ni from the interlayer,Fe_(2)Ti dominated weld nugget was efficaciously replaced by Ni_(3)Ti phase;however,the presence of the large pore and cracks reduced the effective joining *** use of a Nb interlayer resulted in a fundamentally different joint,in which FZs at NiTi and SS sides separated by the unmolten Nb would suppress the mixing of dissimilar molten ***-containing eutectic structures with low brittleness formed at the interfaces,contributing to the enhancement of joint strength(increased by 38%on fracture load and 460%on energy absorption).A high-melting-point interlayer showed great potential to realize a reliable and high-performing RSWed NiTi-SS joint.

关键词： NiTi Stainless steel Resistance spot welding Intermetallic compounds Mechanical properties

discovery of marageing steels: machine learning vs. physical metallurgical modelling

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journal of Materials Science & Technology 2021年第28期87卷 258-268页

作者： Chunguang Shen Chenchong Wang pedro e.j.rivera-díaz-del-castillo dake Xu Qian Zhang Chi Zhang Wei Xu State Key Laboratory of Rolling and Automation Northeastern UniversityShenyang110819China department of engineering Lancaster UniversityLA14YKLancasterUK Key Laboratory of Advanced Materials of Ministry of education School of Materials Science and EngineeringTsinghua UniversityBeijing100084China

physical metallurgical(pM)and data-driven approaches can be independently applied to alloy *** technology is a field of physical metallurgy around which some of the most comprehensive understanding has been developed,with vast models on the relationship between composition,processing,microstructure and *** have been applied to the design of new steel alloys in the pursuit of grades of improved *** the advent of rapid computing and low-cost data storage,a wealth of data has become available to a suite of modelling techniques referred to as machine learning(ML).ML is being emergingly applied in materials discovery while it requires data mining with its adoption being limited by insufficient high-quality datasets,often leading to unrealistic materials design predictions outside the boundaries of the intended *** is therefore required to appraise the strength and weaknesses of pM and ML approach,to assess the real design power of each towards designing novel steel *** work incorporates models and datasets from well-established literature on marageing *** genetic algorithm(GA)with pM models to optimise the parameters adopted for each dataset to maximise the prediction accuracy of pM models,and the results were compared with ML *** results indicate that pM approaches provide a clearer picture of the overall composition-microstructureproperties relationship but are highly sensitive to the alloy system and hence lack on exploration ability of new *** conversely provides little explicit physical insight whilst yielding a stronger prediction accuracy for large-scale *** pM/ML approaches provide solutions maximising accuracy,while leading to a clearer physical picture and the desired properties.

关键词： Machine learning physical metallurgy Small sample problem Marageing steel

NeCAB family of neuronal calcium-binding proteins in health and disease

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Neural Regeneration Research 2025年第5期20卷 1236-1243页

作者： diones Bueno Michael K.e.Schafer Sudena Wang Michael j.Schmeisser Axel Methner Institute for Molecular Medicine University Medical Center of the Johannes Gutenberg-UniversityMainzGermany department of Anesthesiology University Medical Center of the Johannes Gutenberg-UniversityMainzGermany Institute of Anatomy University Medical Center of the Johannes Gutenberg-UniversityMainzGermany

The N-terminal eF-hand calcium-binding proteins 1–3(NeCAB1–3) constitute a family of predominantly neuronal proteins characterized by the presence of at least one eF-hand calcium-binding domain and a functionally less well characterized C-terminal antibiotic biosynthesis monooxygenase domain. All three family members were initially discovered due to their interactions with other proteins. NeCAB1 associates with synaptotagmin-1, a critical neuronal protein involved in membrane trafficking and synaptic vesicle exocytosis. NeCAB2 interacts with predominantly striatal G-protein-coupled receptors, while NeCAB3 partners with amyloid-β A4 precursor protein-binding family A members 2 and 3, key regulators of amyloid-β production. This demonstrates the capacity of the family for interactions with various classes of proteins. NeCAB proteins exhibit distinct subcellular localizations: NeCAB1 is found in the nucleus and cytosol, NeCAB2 resides in endosomes and the plasma membrane, and NeCAB3 is present in the endoplasmic reticulum and Golgi apparatus. The antibiotic biosynthesis monooxygenase domain, an evolutionarily ancient component, is akin to atypical heme oxygenases in prokaryotes but is not wellcharacterized in vertebrates. prokaryotic antibiotic biosynthesis monooxygenase domains typically form dimers, suggesting that calcium-mediated conformational changes in NeCAB proteins may induce antibiotic biosynthesis monooxygenase domain dimerization, potentially activating some enzymatic properties. However, the substrate for this enzymatic activity remains uncertain. Alternatively, calcium-mediated conformational changes might influence protein interactions or the subcellular localization of NeCAB proteins by controlling the availability of protein–protein interaction domains situated between the eF hands and the antibiotic biosynthesis monooxygenase domain. This review summarizes what is known about genomic organization, tissue expression, intracellular localization, interac

关键词： calcium eF hand mitochondria nervous system signal transduction

Malargüe Site Remediation:A Successful Solution for Uranium Mill Tailings

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原子能科学技术 2024年第10期58卷 2088-2094页

作者： BARARI e díaz j G GIOMIA KeMpF R A National Atomic energy Commission Av.Del Libertador 8250Ciudad Autónoma de Buenos AiresC1429BNPArgentina

Comisión Nacional de energía Atómica (CNeA) has the responsibility for restoring uranium mining facilities once the operations have ***,within its environmental program and in compliance with its legal responsibilities,decides to implement a restoration project for all sites related to the mining and processing of uranium *** Malargüe Site is located within the province of Mendoza in the city of Malargü*** is the first site to successfully complete its *** activities consist of relocation of tailings to an engineering *** tailings management(encapsulation) and rehabilitation of the area was finished in june *** remediation alternative for the ore tailings was selected after conducting comparative studies and submitted the project to the society for *** objective of the encapsulation of the mineral tails is to isolate them from the environment,also proceeding with the decontamination and rehabilitation of the area (landscaping,post-closure monitoring and 20 years monitoring period).encapsulation consisted of the construction of a containment cell for the mine tailings,to isolate them and prevent pollutants from entering the environment through the transfer *** clean the impacted areas,the soil was removed,it was incorporated into the encapsulation,and the filling was carried out with natural soils from the *** prevents radon transfer to the environment,as ^(222)Ra is an alpha emitter with a half-life of four days,which produces its own radioactive *** progeny are solids,and when a ^(222)Ra nucleus emits an alpha particle into the air,the resulting ^(218)po nucleus,momentarily electrically charged,adheres to any dust *** prevents the discharge into the air containing radon and also containing dust particles charged with intensely radioactive radon *** tasks mentioned make it possible to decrease radon emanation,reduce radiological risks to the public and pre

关键词： remediation radionuclide transfer tailings encapsulation solution sustainable

Helicobacter pylori vacA s1a and s1b alleles from clinical isolates from different regions of Chile show a distinct geographic distribution

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World journal of Gastroenterology 2005年第40期11卷 6366-6372页

作者： MI díaz A Valdivia p Martínez jL palacios p Harris j Novales e Garrido d Valderrama C Shilling A Kirberg e Hebel j Fierro R Bravo F Siegel G Leon G Klapp A Venegas departamento de Genética Molecular y Microbiología. pontificia Universidad Católica de Chile. Santiago departamento de pediatría Centro de diagnóstico Terapéutico Los Angeles Unidad de Gastroenterología Anatomía patológica Centro de endoscopía Quirúrgica Hospital Base de Linares Hospital Regional de Valdivia Instituto de Bioquímica Hospital Regional de punta Arenas

AIM： To establish the most common vacA alleles in Helicobacter pylori （ H pylon） strains isolated from Chilean patients and its relationship with gastritis and gastroduodenal ulcers, MeTHOdS： Two hundred and forty five Hpyloriclinical isolates were obtained from 79 biopsies from Chilean infected patients suffedng from gastrointestinal diseases. An average of 2-3 strains per patient was isolated and the vac4 genotype was analyzed by pCR and 3% agarose electrophoresis. Some genotypes were checked by dNA sequencing. ReSULTS： The most prevalent vacA genotype in Chilean patients was slb ml （76%）, followed by sla ml （21%）. In oontrast, the s2 m2 genotype was scarcely represented （3%）. The slb ml genotype was found most frequently linked to gastropathies （p〈0.05） rather than ulcers. Ulcers were found more commonly in male and older patients. Curiously, patents IMng in dties located North and far South of Santiago, thecapital and largest Chilean city, carried almost exclusively strains with the slb ml genotype. In contrast, patients from Santiago and cities located South of Santiago carded strains with either one or both sla ml and slb ml genotypes. Regarding the s2 m2 genotype, comparison with GenBank sequences revealed that Chilean s2 sequence was identical to those of Australian, American, and Colombian strains but quite different from those of Alaska and India. CONCLUSION： differences in geographic distribution of the s and m vacA alleles in Chile and a relationship of slb ml genotype with gastritis were found. Sequence data in part support a hispanic origin for the vacA genotype. Asymmetric distribution of genotypes slb ml and s2 m2 recedes H pyloristrain distribution in Spain and portugal.

关键词： Hpylori vacA alleles Chilean isolates s1 s2 m1 and m2 sequences

evolution in the formation of graphene nanocapsules from coal tar pitch

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International journal of Coal Science & Technology 2020年第4期7卷 816-824页

作者： d.M.puente-Siller A.e.Garcia-castillo j.A.Lopez-Corpus A.perea-Garduno department of Research and development Altos Hornos de MexicoS.A.B.de C.V.Prolongacion JuarezS/NLa Loma.25770 Monclova.CoahuilaMexico

It has recently been reported that coal tar pitch(CTp)can be utilised as raw material for the production of graphene nanocapsules(GNCs)because it is formed by a great quantity of aromatic organic compounds(which promote the rearrangement of double bonds by a process of polymerisation).due to the importance of graphene and the search for a non-expensive methodology to produce it,this work used CTp to synthesise GNCs using an in situ activation technique at low temperatures and evaluating the effect of the working temperature on the formation of such *** other words,analysing the form of the particle as the temperature rises from 600 to 900℃.As result of the experimentation,powders were obtained and analysed by the techniques of X-Ray diffraction,Raman Spectroscopy and Microscopy,employing Field Fmission Scanning electron Microscopy by normal mode as well as by Scanning Transmission electron Microscopy and a High-Resolution Scanning electron *** results show that working with temperatures between 800 and 850℃promotes the production of GNCs,considering that their size reduces as the working temperature rises.

关键词： Synthesis Nanocapsule Graphene Tar Agglomeration

Immunology of a unique biological structure:the echinococcus laminated layer

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protein & Cell 2023年第2期14卷 87-104页

作者： Álvaro díaz Anabella ABarrios Leticia Grezzi Camila Mouhape Stephen j.jenkins judith e.Allen Cecilia Casaravilla Área Inmunología Departamento de Biociencias(Facultad de Química)and Cátedra de InmunologíaInstituto de Química Biológica(Facultad de Ciencias)Universidad de la RepúblicaMontevideoUruguay Centre for Inflammation Research Queen's Medical Research InstituteUniversity of EdinburghEdinburghEH89JUUK Lydia Becker Institute of Immunology and Inflammation School of Biological SciencesUniversity of ManchesterManchester Academic Health Sciences CentreManchesterM139NQUK

The larval stages of the cestode parasites belonging to the genus echinococcus grow within internal organs of humans and a range of animal *** resulting diseases,collectively termed echinococcoses,include major neglected tropical diseases of humans and *** larvae are outwardly protected by the laminated layer(LL),an acellular structure that is unique to this *** LL is based on a fibrillar meshwork made up of mucins,which are decorated by galactose-rich *** addition,in the species cluster termed *** sensu lato,the LL features nano-deposits of the calcium salt of myo-inositol hexakisphosphate(Insp_(6)).The main purpose of our article is to update the immunobiology of the *** recent advances in this area are(i)the demonstration of LL“debris”at the infection site and draining lymph nodes,(ii)the characterization of the decoy activity of calcium Inp6 with respect to complement,(iii)the evidence that the LL mucin carbohydrates interact specifically with a lectin receptor expressed in Kupffer cells(Clec4F),and(iv)the characterization of what appear to be receptor-independent effects of LL particles on dendritic cells and *** information is missing on the immunology of this intriguing structure:we discuss gaps in knowledge and propose possible avenues for research.

关键词： mucin complement echinococcus macrophage dendritic cell Clec4F

Climate-driven variations in productivity reveal adaptive strategies in Iberian cork oak agroforestry systems

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Forest ecosystems 2022年第1期9卷 83-93页

作者： josé Carlos pérez-Girón emilio Rafael díaz-Varela pedro Álvarez-Álvarez department of Organisms and Systems Biology Polytechnic School of MieresUniversity of OviedoE-33600MieresAsturiasSpain Research Group on planning and Management in Complex Adaptive Socio-ecological Systems(COMpASSeS).School of engineering University of Santiago de CompostelaE-27002LugoSpain

Background:Cork oak agroforestry systems(AFS)have been managed for centuries by humans to produce cork and other goods and services and have recently been recognised as an important reservoir for biodiversity improvement and ***,despite having recently been included as a natural habitat of community-wide interest within the eU Habitats directive,these systems are in a critical situation of *** other factors,they are strongly threatened by climate change,the effects of which are also expected to be particularly severe in the Mediterranean *** this study,we aimed to evaluate the influence of climate variability by examining primary production indicators and also to analyse whether the geographical location may have a role in the incidence of the adverse effects of ***:Cork oak AFS were identified in the Forest Map of Spain and the Land use map of portugal and categorized on the basis of canopy *** climate data from 2001 to 2020 were used to model relationships with climate predictors and proximity to the *** analysis was conducted to identify significant spatial clusters of high-and low-efficiency ***:The responses to the influence of climatic conditions differed among the various cork oak AFS categories,particularly in the forest category,which was less dependent on climate *** humidity and water availability were the main drivers of net primary production(Npp).Carbon use efficiency(CUe)was limited by relative humidity and spring temperature in open *** to the coast proved beneficial,especially in years with adverse weather conditions,but was not a limiting factor for survival of the ***,the results of the hotspot analysis supported the other findings,highlighting high-efficiency areas close to the coast and cold spots grouped in specific areas or dispersed ***:Canopy plays a key role in the influence of climatic conditions,particu

关键词： Net primary production Carbon use efficiency Climate Quercus suber Agroforestry system

Surface properties of Fe_4N Compounds Layer on AISI 4340 Steel Modified by pulsed plasma Nitriding

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journal of Materials Science & Technology 2013年第3期29卷 287-290页

作者： j.C.díaz-Guillén G.Vargas-Gutiérrez e.e.Granda-Gutiérrez j.S.Zamarripa-pia S.I.pérez-Aguilar j.Candelas-Ramírez L.lvarez-Contreras Centro de Investigacin en Materiales Avanzados S.C.Miguel de Cervantes 120Complejo Industrial ChihuahuaC.P.31109 ChihuahuaChihuahuaMexico Corporacin Mexicana de Investigacin en Materiales S.A.de C.V.Ciencia y Tecnología No 790Fracc.Saltillo 400C.P.25290 SaltilloCoahuilaMexico Centro de Investigacin y estudios Avanzados del IpN Unidad SaltilloCarretera Saltillo Monterrey km 13Apdo.Postal 663C.P.25000 SaltilloCoahuilaMexico

In this work, the effect of nitriding current density on hardness, crystalline phase composition, layer thickness and corrosion rate of AlSl 4340 steel has been studied. X-ray diffraction analysis shows that thin layers formed during nitriding process are constituted of 7-Fe4N for samples processed between 1 and 2.5 mA/cm2. Thickness of nitrided layer increases proportionally to current density （0 μm for 0.5 mA/cm2 to 15 pm for 2.5 mA/cm2）. plasma nitriding increased the surface hardness from 300 HV50g for untreated sample, to around 800HV5og for nitrided samples at 1 mA/cm2. While the untreated samples exhibited a corrosion rate of 0.153 mm per year, the corrosion performance was improved up to 0.03 mm per year at current densities above 1 mA/cm2, which is about one fifth of the corrosion rate of the untreated sample.

关键词： plasma nitriding Current density Hardness Corrosion