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Influence of LDH conversion coatings on the adhesion and corrosion protection of friction spot-joined AA2024-T3/CF-PPs

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Journal of Materials science & Technology 2021年第8期67卷 197-210页

作者： A.C.Bouali N.M.Andre M.R.silva Campos M.serdechnova J.F.dos santos s.T.Amancio-filho M.L.Zheludkevich Institute of Materials Research Helmholtz-Zentrum G eesthacht.Magnesium Innovation CentreCorrosion and Surface TechnologyMax-Planck-Straβe 121502 CeesthachtGermany Institute of Materials Research Helmholtz-Zentrum GeesthachtMaterials MechanicsSolid State Joining ProcessesMax-Planck-Straβe 121502 CeesthachtGermany Graz University of Technology-TU Graz Institute of Materials Sciencejoining and FormingBMK Endowed Professorship for AviationKopemikusgasse 24/18010 GrazAustria Faculty of Engineering University of KielKaiserstrasse 224143 KielGermany

Layered double hydroxide(LDH)conversion coatings loaded with corrosion inhibitors were suggested for the surface treatment of the aluminum alloy 2024-T3,prior to friction spot joining with carbon-fiber reinforced polyphenylene sulfide(AA2024-T3/CF-PPs).Vanadate was used as a model corrosion *** shear testing method revealed an increase of approx.20%of the joint’s adhesion performance when treated with LDH and before exposure to salt *** evaluation of the joints after exposure to salt spray demonstrated a significant difference in the corrosion behavior of the joints when the AA2024-T3 is treated with LDH loaded with nitrate and vanadate *** LDH intercalated with nitrate revealed a clear improvement in the mechanical and corrosion resistance performance of the joints,even after 6 weeks of salt ***,the LDH intercalated with vanadate failed in providing protection against corrosion as well as preserving the mechanical properties of the *** effect of the galvanic corrosion was further investigated by zero resistance ammeter(ZRA)measurements as well as localized scanning vibrating electrode technique(sVET).

关键词： Friction spot joining Layered double hydroxide Galvanic couple Corrosion protection Adhesion

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Extracellular matrix-derived materials for tissue engineering and regenerative medicine:A journey from isolation to characterization and application

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Bioactive Materials 2024年第4期34卷 494-519页

作者： Helena Vilaça-Faria Jennifer Noro Rui L.reis Rogério P.Pirraco 3B’s Research Group I3Bs-Research Institute on BiomaterialsBiodegradables and BiomimeticsUniversity of MinhoHeadquarters of the European Institute of Excellence on Tissue Engineering and Regenerative MedicineAveParkParque de Ciência e TecnologiaZona Industrial da Gandra4805-017BarcoGuimarãesPortugal ICVs/3B’s-PT Government Associate Laboratory BragaGuimarãesPortugal

Biomaterial choice is an essential step during the development tissue engineering and regenerative medicine(TERM)*** selected biomaterial must present properties allowing the physiological-like recapitulation of several processes that lead to the reestablishment of homeostatic tissue or organ *** derived from the extracellular matrix(ECM)present many such properties and their use in the field has been steadily *** this growing importance,it becomes imperative to provide a comprehensive overview of ECM biomaterials,encompassing their sourcing,processing,and integration into TERM *** review compiles the main strategies used to isolate and process ECM-derived biomaterials as well as different techniques used for its characterization,namely biochemical and chemical,physical,morphological,and ***,some of their applications in the TERM field are explored and discussed.

关键词： Extracted ECM Extraction methods Characterization ECM-derived applications

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Population structure of Araucaria angustifolia under distinct forest protection status:implications for management and conservation

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Journal of Forestry Research 2023年第5期34卷 1437-1446页

作者： Vinicius Costa Cysneiros Allan Libanio Pelissari sylvio Pellico Netto sebastiao do Amaral Machado Afonso Figueiredo filho Departamento de Agricultura Biodiversidade e FlorestasUniversidade Federal de Santa Catarina-UFSCRodovia Ulysses GaboardiKm 03CuritibanosSC 89520-000Brazil Departamento de Ciencias Florestais Universidade Federal do Paraná-UFPRAv.Prof.Lothario Meissner632CuritibaPR 80210-170Brazil Departamento de Engenharia Florestal Universidade Estadual do Centro-Oeste-UNICENTROPR-153Km 7IratiPR 84500-000Brazil

Araucaria angustifolia is the dominant coniferous species in Brazil,a long-lived pioneer species and a supplier of valuable timber and non-timber products,which gives it key-species *** study examines how *** population structure affects the stand structure,and whether these relationships differ between protected and unprotected *** study was carried out on two protection status forests(national forest and urban forest)in a region of Atlantic mixed forest in Paranástate,southern *** coefficient and the Weibull shape parameter described the population structure and its effects on species diversity and biomass *** diameter distribution differed significantly between forests,with unbalanced structure in both,although regeneration was more abundant in the protected *** positively affected aboveground biomass whereas shape negatively affected it and species *** relationships differed between protected and unprotected *** effect of *** populations on stand structure was conditioned on protection ***-growth populations may have lower diversity and biomass stock even supporting large ***,old-growth forests,can lead to wood loss through mortality,senescence,and declining populations,representing the waste of a valuable timber *** findings provide useful knowledge for forest management,species conservation,and the carbon market.

关键词： Key species Diameter distribution Weibull shape parameter Aboveground biomass

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shielding AZ91D-1%Ca from corrosion through ultrasound melt treatment:A study for stent design

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Journal of Magnesium and Alloys 2023年第8期11卷 2901-2915页

作者： I.V.Gomes M.Pacheco M.Nienaber s.C.Neves D.Mei A.Barros R.L.reis J.L.Alves H.Puga CMEMs–UMinho University of MinhoGuimarãesPortugal LABBELs–Associate Laboratory BragaGuimarãesPortugal B's Research Group-Research Institute on Biomaterials Biodegradables and BiomimeticsUniversity of MinhoHeadquarters of the European Institute of Excellence on Tissue Engineering and Regenerative MedicineAvepark-Parque de Ciência e TecnologiaBarco GuimarãesPortugal ICVs/3B's-PT Government Associate Laboratory BragaGuimarãesPortugal Institute of Material and Process Design Helmholtz-Zentrum HereonGeesthacht 21502Germany school of Materials science and Engineering&Henan Key Laboratory of Advanced Magnesium Alloy Zhengzhou UniversityZhengzhou 450001China

Magnesium-based materials show great potential for producing biodegradable stents,but their high corrosion rates are a *** study investigates whether ultrasound melt treatment can change the corrosion response of an extruded AZ91D-1.0%Ca(wt.%)in Earle's Balanced salt solution by tailoring the intermetallics'morphology in the as-extruded *** results showed that the wires from ultrasound-treated ingots corroded faster than non-treated ones in immersion for up to 6 *** trend shifted for longer periods,and ultrasound-treated material showed lower corrosion rates and uniform corrosion,while the non-treated material displayed localized corrosion *** testing of the wires demonstrated that immersion in EBss lowered the tensile strength and elongation at fracture due to material degradation,regardless of the processing ***,this decline was sharper in the non-treated *** findings suggest that ultrasound melt processing can be a promising method for improving the corrosion resistance of magnesium-based materials,paving the way for their use in manufacturing biodegradable stents.

关键词： Magnesium Ultrasound treatment stent Corrosion Mechanical properties

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sIR model applied in dynamics of COVID-19 contagion in s˜ao Lu´ıs-MA,Brazil

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International Journal of Modeling, simulation, and scientific Computing 2021年第3期12卷 99-111页

作者： Felix silva Costa Italo Jose Lima De sousa Jose Adson reis santos Department of Mathematics and Informatics state University of Maranhao sao Luıs MA 65054-970Brazil

The dynamics of COVID-19 contagion investigated in s˜ao Lu′ıs-MA,Brazil,is based on the sIR model.s˜ao Lu′ıs was the first city in Brazil to implement the lockdown to control the *** sIR model’s definition and properties are presented in addition to the ways of estimating its *** estimation of their values is due to a database released on the Maranh˜ao state Health Department website during the period March 20 to July 2,*** analysis of the proliferation of the disease shows the evolution of the COVID-19 in the *** graphs illustrate that result.

关键词： COVID-19 population dynamics sIR model

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Laminated solid Timber slab with Transverse Prestressing Using the strategy of Interleaved Vertical Displacement of Lamellae

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Journal of Civil Engineering and Architecture 2024年第4期18卷 186-198页

作者： Bianca Bispo dos.reis jorge Daniel de Melo Moura Marcos Vinício de Camargo Everaldo Pletz Graduate Program in Architecture and Urbanism Londrina State UniversityJardim Portal de Versalhes 1Londrina 86057-970PRBrazil Department of Civil Engineering Federal Technological University of Paraná(UTFPR)Apucarana 86812-460PRBrazil Retired professor Department of structural Engineering Londrina State UniversityLondrina 86057-970PRBrazil

This article presents a study on the structural behavior of transversely prestressed laminated timber slabs,focusing on an innovative approach:vertically misaligned *** misalignment,achieved by sliding vertically the wooden lamellae rather than aligning them,enhances the slab’s cross-section moment of inertia,thereby improving load-bearing capacity and *** involved two groups of structural size specimens:one with vertically aligned lamellae(control group)and the other with misaligned lamellae(study group).Results showed the study group exhibited 42%superior stiffness and 10%less load capacity compared to the *** typically occurred individually in the lamellae,particularly in those with defects or lower modulus of elasticity,concentrated in the middle third of the slabs’free span where tensile stresses *** a higher number of failed lamellae,the study group demonstrated promising *** of prestressing bar indicated no damage at all in the thread,suggesting potential for reducing bar *** findings offer crucial insights into applying these slabs in timber construction as well as to any kind of construction.

关键词： Transversal prestressed slabs wooden construction plantation wood flexural testing design methodology

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Crop residues: applications of lignocellulosic biomass in the context of a biorefinery

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Frontiers in Energy 2022年第2期16卷 224-245页

作者： Maria Carolina ANDRADE Caio de Oliveira GORGULHO sILVA Leonora Rios de sOUZA MOREIRA Edivaldo Ximenes FERREIRA filho Laboratory of Enzymology Department of Cellular BiologyUniversity of BrasiliaBrasiliaDFBrazil

Interest in lignocellulosic biomass conversion technologies has increased recently because of their potential to reduce the dependency on non-renewable feedstocks. Residues from a variety of crops are the major source of lignocellulose, which is being produced in increasingly large quantities worldwide. The commercial exploitation of crop residues as feedstocks for biorefineries which could be used to produce a variety of goods such as biofuels, biochemicals, bioplastics, and enzymes is an attractive approach not only for adding value to residues but also for providing renewable products required by the expanding bioeconomy market. Moreover, the implementation of biorefineries in different regions has the potential to add value to the specific crop residues produced in the region. In this review, several aspects of crop residue application in biorefineries are discussed, including the role of crop residues in the bioeconomy and circular economy concepts, the main technical aspects of crop residue conversion in biorefineries, the main crop residues generated in different regions of the world and their availability, the potential value-added bioproducts that can be extracted or produced from each crop residue, and the major advantages and challenges associated with crop residue utilization in biorefineries. Despite their potential, most biomass refining technologies are not sufficiently advanced or financially viable. several technical obstacles, especially with regard to crop residue collection, handling, and pre-treatment, prevent the implementation of biorefineries on a commercial scale. Further research is needed to resolve these scale-up-related challenges. Increased governmental incentives and bioeconomic strategies are expected to boost the biorefinery market and the cost competitiveness of biorefinery products.

关键词： crop residue biorefinery bioproduct biomass circular bioeconomy enzyme

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没有清楚地认识它就不能改变它:要了解天才女性的特殊需要

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心理科学进展 1989年第1期 30-34页

作者： s. M. reis 徐凡康涅狄格大学

文中就与天才女性有关的一些主要问题提出了一个总的看法。这些方面主要包括:未充分发挥潜力的天才女性;女性的创造性生产力;数学和自然科学中的男性优势;文化陈观、性角色和其他;缺乏计划;尽善尽美情结和伪装综合症有关咨询和特殊群体... 详细信息

文中就与天才女性有关的一些主要问题提出了一个总的看法。这些方面主要包括:未充分发挥潜力的天才女性;女性的创造性生产力;数学和自然科学中的男性优势;文化陈观、性角色和其他;缺乏计划;尽善尽美情结和伪装综合症有关咨询和特殊群体的问题。文章扼要地讨论了与性别有关的能力、成就、个性、社会环境压力等问题的有关研究,并对将来的研究方向提出了一些建议。

关键词：年轻女性自然科学天才男性妇女综合症研究方向潜力创造性特殊群体

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Reconstructing pre-erosion topography using spatial interpolation techniques： A validation-based approach

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Journal of Geographical sciences 2015年第2期25卷 196-210页

作者： Rafaello BERGONsE Eusebio reis Center for Geographical studies University of Lisbon Portugal

Understanding the topographic context preceding the development of erosive landforms is of major relevance in geomorphic research, as topography is an important factor on both water and mass movement-related erosion, and knowledge of the original surface is a condition for quantifying the volume of eroded material. Although any reconstruction implies assuming that the resulting surface reflects the original topography, past works have been dominated by linear interpolation methods, incapable of generating curved surfaces in areas with no data or values out- side the range of variation of inputs. In spite of these limitations, impossibility of validation has led to the assumption of surface representativity never being challenged. In this paper, a validation-based method is applied in order to define the optimal interpolation technique for reconstructing pre-erosion topography in a given study area. In spite of the absence of the original surface, different techniques can be nonetheless evaluated by quantifying their ca- pacity to reproduce known topography in unincised locations within the same geomorphic contexts of existing erosive landforms. A linear method （Triangulated Irregular Network, TIN） and 23 parameterizations of three distinct spline interpolation techniques were compared using 50 test areas in a context of research on large gully dynamics in the south of Portugal. Results show that almost all spline methods produced smaller errors than the TIN, and that the latter produced a mean absolute error 61.4% higher than the best spline method, clearly establishing both the better adjustment of splines to the geomorphic context considered and the limitations of linear approaches. The proposed method can easily be applied to different interpolation techniques and topographic contexts, enabling better calculations of eroded volumes and denudation rates as well as the investigation of controls by antecedent topographic form over erosive processes.

关键词： pre-erosion topography surface reconstruction spatial interpolation spline interpolation triangulated irregular networks erosive landforms gully erosion

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Optimizing Nitrogen Use Efficiency for No-Till Corn Production by Improving Root Growth and Capturing NO_(3)-N in subsoil

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Pedosphere 2016年第4期26卷 474-485页

作者： Eduardo F. CAIREs Renato ZARDO filho Gabriel BARTH Helio A. W. JORIs Department of soil science and Agricultural Engineering State University of Ponta Grossa Ponta Grossa 84030-900 Green Circle Growers 51051 US FIighway 20 Oberlin OH 44074 ABC Foundation Research and Agricultural Development Castro 84165-700

subsoil acidity restricts root growth and reduces crop yields in many parts of the world. More than half of the fertilizer nitrogen(N) applied in crop production is currently lost to the environment. This study aimed to investigate the effect of gypsum application on the efficiency of N fertilizer in no-till corn(Zea mays L.) production in southern Brazil. A field experiment examined the effects of surface-applied gypsum(0, 5, 10, and 15 Mg ha^(-1)) and top-dressed ammonium nitrate(NH_4NO_3)(60, 120, and 180 kg N ha^(-1)) on corn root length, N uptake, and grain yield. A greenhouse experiment was conducted using undisturbed soil columns collected from the field experiment site to evaluate NO_3-N leaching, N uptake, and root length with surface-applied gypsum(0 and 10 Mg ha^(-1)) and top-dressed NH_4NO_3(0 and 180 kg N ha^(-1)). Amelioration of subsoil acidity due to gypsum application increased corn root growth,N uptake, grain yield, and N use efficiency. Applying gypsum to the soil surface increased corn grain yield by 19%–38% and partial factor productivity of N(PFPN) by 27%–38%, depending on the N application rate. Results of the undisturbed soil column greenhouse experiment showed that improvement of N use efficiency by gypsum application was due to the higher N uptake from NO_3-N in the subsoil as a result of increased corn root length. Our results suggest that ameliorating subsoil acidity with gypsum in a no-till corn system could increase N use efficiency, improve grain yield, and reduce environmental risks due to NO_3-N leaching.

关键词： ammonium nitrate grain yield N uptake nitrate leaching partial factor productivity of nitrogen soil acidity

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