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effect of cerium/lanthanum addition on microstructure and mechanical properties of Al7075 alloy via mechanical alloying and sintering

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Journal of Rare earths 2016年第4期34卷 420-427页

作者： R.pérez-Bustamante A.Reyna-Cruz D.C.Acosta-pena C.R.santillán-Rodríguez J.A.Matutes-Aquino F.pérez-Bustamante M.C.Maldonado-Orozco J.Aguilar-santillán R.Martínez-sánchez Research Center in Advanced Materials(CIMA V) National Laboratory of NanotechnologyMiguel de Cervantes No.120C.P.31109ChihuahuaChih.Mexico Faculty of engineering Autonomous University of Chihuahua(UACH)Circuito No.1 Nuevo Campus UniversitarioC.P.31 125ChihuahuaChih.Mexico Faculty of Chemical sciences Autonomous University of Chihuahua(UACH)Circuito No.1 Nuevo Campus UniversitarioC.P.31125ChihuahuaChih.Mexico Materials&Tools LLC 4118 E Washington CtGilbertAZUSA 85234

The effect of the Al-6Ce-3La（ACL） on the microstructural behavior of the Al7075 was investigated. Materials were synthesized by mechanical alloying with variation in the ACL content and milling time. products were characterized and studied in the as-milled condition and mechanically evaluated after sintering. The synergetic effect of milling time and ACL content in the modified materials led to a reduction in the particle size. Results from electron microscopy showed a homogeneous dispersion of Ce/La phases up to 20 wt.% of ACL content after 10 h of milling. Mechanical evaluation under compressive test showed an improved performance for those alloys reinforced with 0.2 wt.% and 0.5 wt.% of ACL.

关键词： mechanical alloying rare earths aluminum microstructure sintering

Merging bound states in the continuum in an open acoustic resonator

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science China(physics,Mechanics & Astronomy) 2025年第1期Mechanics & Astronomy) .卷 124-131页

作者： Lujun Huang Bin Jia Artem s.pilipchuk sibo Huang Chen shen Almas F.sadreev Yong Li Andrey e.Miroshnichenko school of physics and electronic sciences East China Normal University Institute of Acoustics Tongji University L.V.Kirensky Institute of physics Department of Mechanical engineering Rowan University school of engineering and Technology University of New South Wales at Canberra

Bound states in the continuum （BICs） are perfectly localized resonances despite embedding in the continuum ***,an isolated BIC is very sensitive to the structure ***,we report merging acoustic BICs in a single open resonator,robust against the structure *** find that both symmetry-protected BIC and Friedrich-Wintgen BIC are sustained in a single coupled waveguide-resonator *** varying the height and length of the resonator,these two BICs move toward each other and merge into a single one at a critical *** to an individual BIC,the merged BIC is robust against fabrication error be.a.se its Q-factor is proportional to ΔL-4,whereΔL embodies the structure *** essence of this extraordinary phenomenon is perfectly explained by the two-and three-level approximations of the effective nonHermitian ***,we present direct experimental demonstrations of the moving and merging of BICs in a coupled 3D waveguide-resonator,which are evidenced by the vanishing of the linewidth of Fano resonance in the transmission *** results may find exciting applications in designing high-quality acoustic sources,sensors and filters.

关键词： acoustic resonances bound state in the continuum high-Q resonances

Revolutionizing the understanding of liver disease:Metabolism,function and future

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World Journal of Hepatology 2024年第12期16卷 1365-1370页

作者： Arnulfo e Morales-Galicia Mariana M Ramírez-Mejía Guadalupe ponciano-Rodriguez Nahum Méndez-sánchez Faculty of Medicine National Autonomous University of MexicoMexico City 04360Mexico plan of Combined studies in Medicine Faculty of MedicineNational Autonomous University of MexicoMexico City 04360Mexico Liver Research Unit Medica Sur Clinic and FoundationMexico City 14050Mexico Department of public Health Faculty of MedicineNational Autonomous University of MexicoMexico City 04360Mexico

The intersection between metabolic-associated steatotic liver disease(MAsLD)and chronic hepatitis B virus(HBV)infection is an emerging area of research with significant implications for public health and clinical *** et al’s study highlights the complexities of managing patients with concurrent MAsLD and *** findings revealed that patients with concurrent MAsLD-HBV exhibited more severe liver inflammation and fibrosis,whereas those with HBV alone pre-sented a better lipid *** growing recognition of metabolic dysfunction in liver disease,reflected in the shift from nonalcoholic liver disease to MAsLD,demands updates to clinical guidelines,particularly for patients with dual *** the biological interactions between MAsLD and HBV could lead to novel therapeutic approaches,emphasizing the need for personalized treatment *** coexistence of MAsLD and HBV presents therapeutic challenges,particularly in managing advanced fibrosis and cirrhosis,which are more likely in these *** aim of this editorial is to analyze the interaction between MAsLD and HBV,highlight the pathophysiological mechanisms that exacerbate liver disease when both conditions coexist,and discuss the clinical implications of the findings of Wang et al.

关键词： Nonalcoholic fatty liver disease Nonalcoholic steatohepatitis Hepatitis B Chronic hepatitis B Hepatitis B virus Obesity Type 2 diabetes mellitus Chronic liver disease Hepatocellular carcinoma

study of the e^+e^- to hadrons via IsR at BABAR

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Chinese physics C 2010年第6期34卷 660-668页

作者： e.p.solodov Budker Institute of Nuclear physics

experimental data from the pep-II B-factory at 10.6 GeV center-of-mass （c.m.） energy, obtained via initial-state radiation （IsR） with the BABAR detector, are presented. The cross sections for many hadronic processes have been measured from the production threshold to 4-5 GeV of the e^＋e^- c.m. energy. The obtained data allow to study a number of intermediate states and determine the parameters of known resonances and their branching fractions. The exclusive cross section for some number of hadronic sub-processes are presented.

关键词： IsR e^+e^- hadrons BABAR

Rehabilitation of degraded areas in northeastern patagonia, Argentina: effects of environmental conditions and plant functional traits on performance of native woody species

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Journal of Arid Land 2020年第4期12卷 653-665页

作者： Juan M ZeBeRIO Carolina A pÉrez National University of Río Negro Atlantic HeadquartersCenter for Environmental Studies from Norpatagonia(CEANPa)Viedma 8500Argentina National Council of scientific and Technical Research(CONICeT) Viedma 8500Argentina ecological and environmental systems Research Laboratory(LIseA) National University of La PlataLa Plata 1900Argentina

Degradation processes affect a vast area of arid and semi-arid lands around the world and damage the environment and people′s health. Degradation processes are driven by human productive activities that cause direct and indirect effects on natural resources, such as species extinction at regional scale, reduction and elimination of vegetation cover, soil erosion, etc. In this context, ecological rehabilitation is an important tool to recover key aspects of the degraded ecosystem. Rehabilitation trials rely on the use of native plant species with characteristics that allow them to obtain high survival and growth rates. The aim of this work was to assess the survival and growth of native woody species in degraded areas of northeastern patagonia and relate them to plant functional traits and environmental variables. We observed high early and late survival rates, and growth rates in prosopis flexuosa DC. var. depressa F.A. Roig and schinus johnstonii F.A. Barkley, and low values in Condalia microphylla Cav. and Geoffroea decorticans(Gillies ex Hook. & Arn.) Burkart. early survival rates were positively associated with specific leaf area(sLA) and precipitation, but negatively associated with wood density, the maximum mean temperature of the warmest month and the minimum mean temperature of the coldest month. Late survival rates were positively associated with sLA and soil organic matter, but negatively associated with plant height and precipitation. The temperature had a positive effect on late survival rates once the plants overcame the critical period of the first summer after they were transplanted to the field. prosopis flexuosa and s. johnstonii were the most successful species in our study. This could be due to their functional traits that allow these species to acclimatize to the local environment. Further research should focus on C. microphylla and G. decorticans to determine how they relate to productive conditions, acclimation to environmental stress, auto-eco

关键词： arid lands Condalia microphylla Geoffroea decorticans prosopis flexuosa schinus johnstonii survival rates height growth basal diameter growth

Nanomechanical hydrodynamic force sensing using suspended microfluidic channels

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Microsystems & Nanoengineering 2023年第3期9卷 95-102页

作者： Alberto Martín-pérez Daniel Ramos Optomechanics Lab Instituto de Ciencia de Materiales de Madrid(ICMMCSIC)3 Sor Juana Inés de la Cruz(Madrid)E-28049 MadridSpain

Microfluidics has demonstrated high versatility in the analysis of in-flow particles and can even achieve mechanical properties measurements of biological cells by applying hydrodynamic ***,there is currently no available technique that enables the direct measurement and tracking of these hydrodynamic forces acting on a flowing *** this work,we introduce a novel method for the direct measurement of the hydrodynamic force actuating on an in-flow particle based on the analysis of the induced resonance changes of suspended microchannel resonators(sMRs).This hydrodynamic force sensitivity depends on the device used;therefore,we considered the geometry and materials to advance this dependency on the sMR resonance frequency.

关键词： hydrodynamic applying flow

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

HVOF-sprayed HAp/s53p4 BG composite coatings on an AZ31 alloy for potential applications in temporary implants

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Journal of Magnesium and Alloys 2024年第1期12卷 345-360页

作者： Carlos A.poblano-salas John Henao Astrid L.Giraldo-Betancur paola Forero-sossa Diego German espinosa-Arbelaez Jorge A.González-sánchez Luis R.Dzib-pérez susana T.estrada-Moo Idelfonso e.pech-pech CIATeQ A.C. Av.Manantiales 23-AParque Industrial Bernardo QuintanaEl MarquésQuerétaro 76246Mexico CONAHCYT-CIATeQ A.C. Av.Manantiales 23-AParque Industrial Bernardo QuintanaEl MarquésQuerétaro 76246Mexico CONAHCYT-Cinvestav Libramiento Norponiente#2000.Fraccionamiento Real de JuriquillaQuerétaro 76230Mexico Universidad Tecnológica de Querétaro Av.Pie de la Cuesta N°2501Querétaro 76148Mexico CIDesI Av.Playa Pie de la Cuesta No 702Col.San PabloQuerétaro 76125Mexico Center for Corrosion Research Autonomous University of CampecheAv.Héroe de Nacozari No.480P.C.24070San Francisco de CampecheCam.Mexico

Bioactive thermal spray coatings produced via high-velocity oxygen fuel spray(HVOF)from hydroxyapatite(HAp)and bioactive glasses(BG)have the potential to be employed on temporary implants due to the ability of both HAp and BG to dissolve and promote osseointegration,considering that both phases have different reaction and dissolution rates under in-vitro *** the present work,75%***-25%wt.s53p4 bioactive glass powders were HVOF-sprayed to obtain HAp/s53p4 BG composite coatings on a bioresorbable AZ31 *** study is focused on exploring the effect of the stand-off distance and fuel/oxygen ratio variation as HVOF parameters to obtain stable structural coatings and to establish their effect on the phases and microstructure produced in those *** characterization techniques,such as scanning electron microscopy,X-ray diffraction,and Fourier transform infrared spectroscopy,were employed to characterize relevant structural and microstructural properties of the composite *** results showed that thermal gradients during coating deposition must be managed to avoid delamination due to the high temperature achieved(max 550℃)and the differences in coefficients of thermal *** was also found that both spraying distance and oxygen/fuel ratio allowed to keep the hydroxyapatite as the main phase in the *** addition,in-vitro electrochemical studies were performed on the obtained HAp/s53p4 BG composite coatings and compared against the uncoated AZ31 *** results showed a significant decrease in hydrogen evolution(at least 98%)when the bioactive coating was applied on the Mg alloy during evaluation in simulated body fluid(sBF).

关键词： Coatings Composites Thermal spray Temporary implants Hydrogen evolution

Modeling the spike Response for Adaptive Fuzzy spiking Neurons with Application to a Fuzzy XOR

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Computer Modeling in engineering & sciences 2018年第6期115卷 295-311页

作者： A.M.e.Ramírez-Mendoza CONACYT Research Fellow–state University of Nuevo León(UANL for its acronym in spanish) Mechanical and Electrical Engineering School(FIME for its acronym in Spanish)Center for Research and Innovation in Aeronautical Engineering(CIIIA for its acronym in Spanish)Carretera a Salinas Victoria km.2.3ApodacaNuevo LeónMéxico

A spike response model(sRM)based on the spikes generator circuit(sGC)of adaptive fuzzy spiking neurons(AFsNs)is *** sRM is simulated in MatlabTM *** proposed model is applied to a configuration of a fuzzy exclusive or(fuzzy XOR)operator,as an illustrative example.A description of the comparison of AFsNs with other similar methods is *** novel method of the.a.sNs is used to determine the value of the weights or parameters of the fuzzy XOR,first with dynamic weights or self-tuning parameters that adapt continuously,then with fixed weights obtained after training,finally with fixed weights and a dynamic gain or self-tuning gain for a fine adjustment of amplitude.

关键词： spike response model spikes generator circuit fuzzy XOR adaptive fuzzy spiking neuron learning algorithm fuzzy neuron self-tuning