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Morphological Characterization of brazil Nut Tree (bertholletia excelsa) Fruit Pericarp

Journal of Renewable materials 2019年第7期7卷 683-692页

作者： Gustavo P.Petrechen Marcos Arduin JoséD.Ambrósio Materials Science and Engineering Postgraduate Program Federal University of São CarlosSão CarlosBrazil Center of Characterization and Materials Development Federal University of São CarlosSão CarlosBrazil Department of Botany Federal University of São CarlosSão CarlosBrazil Citlab-Science Innovation and Technology LaboratorySorocabaBrazil

This article presents the overall morphological structure of the brazil nut tree(bertholletia excelsa)fruit pericarp,from macro to nano *** acquired knowledge would be used for the development of new applications,like using the materials as fillers for biocomposites,or as a hierarchical architecture model for *** research was performed using stereo and light microscopy and conventional and force field emission scanning electron *** pericarp presents three layers:the exocarp,a dark gray,brittle and fragile outer layer;the mesocarp,a beige,dry,rigid,impermeable and fibrous intermediate layer;and the endocarp,an inner layer with similar characteristic as the exocarp,but formed next to the ***,the exocarp and the endocarp presented minor regions of sclereids,fibers and vascular cell bundles,inside major regions of parenchyma *** mesocarp presents a structure of fiber cells regions alternating with sclereids and vascular cells regions,arranged in a composite like arrangement,with the fibers cells bundles acting as randomly oriented disperse phases in a sclereid cells *** arrangement was associated with the mesocarp relative superior proprieties,indicating a great material for using as fillers for biocomposites or in biomimetics applications.

关键词： bertholletia excelsa brazil nut fruit pericarp morphological structure microscopy

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Correction to: Environmental consequences of interacting effects of changes in stratospheric ozone, ultraviolet radiation, and climate: UNEP Environmental Effects Assessment Panel, Update 2024 (Photochemical & Photobiological sciences, (2025), 24, 3, (357-392), 10.1007/s43630-025-00687-x)

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Photochemical and Photobiological sciences 2025年第5期24卷 863-865页

作者： Neale, Patrick J. Hylander, Samuel banaszak, Anastazia T. Häder, Donat-P. Rose, Kevin C. Vione, Davide Wängberg, Sten-Åke Jansen, Marcel A. K. busquets, Rosa Andersen, Mads P. Sulbæk Madronich, Sasha Hanson, Mark L. Schikowski, Tamara Solomon, Keith R. Sulzberger, barbara Wallington, Timothy J. Heikkilä, Anu M. Pandey, Krishna K. Andrady, Anthony L. bruckman, Laura S. White, Christopher C. Zhu, Liping bernhard, Germar H. bais, Alkiviadis Aucamp, Pieter J. Chiodo, Gabriel Cordero, Raúl R. Petropavlovskikh, Irina Neale, Rachel E. Olsen, Catherine M. Hales, Simon Lal, Aparna Lingham, Gareth Rhodes, Lesley E. Young, Antony R. Robson, T. Matthew Robinson, Sharon A. barnes, Paul W. bornman, Janet F. Harper, Anna b. Lee, Hanna Calderón, Roy Mackenzie Ossola, Rachele Paul, Nigel D. Revell, Laura E. Wang, Qing-Wei Zepp, Richard G. Environmental Research Center Smithsonian Institution EdgewaterMD United States Centre for Ecology and Evolution in Microbial Model Systems Linnaeus University Kalmar Sweden Unidad Académica de Sistemas Arrecifales Universidad Nacional Autónoma de México Puerto Morelos Mexico Erlangen Germany Department of Biological Sciences and Department of Civil and Environmental Engineering Rensselaer Polytechnic Institute TroyNY United States Department of Chemistry University of Turin Turin Italy Department of Marine Sciences University of Gothenburg Gotheburg Sweden School of Biological Earth and Environmental Sciences Environmental Research Institute University College Cork Cork Ireland Chemical and Pharmaceutical Sciences Kingston University London Kingston Upon Thames United Kingdom Civil Environmental & Geomatic Engineering University College London London United Kingdom Department of Chemistry and Biochemistry California State University NorthridgeCA United States Atmospheric Chemistry Observations and Modeling National Center for Atmospheric Research BoulderCO United States USDA UV-B Monitoring and Research Program Colorado State University Fort. CollinsCO United States Department of Environment and Geography University of Manitoba WinnipegMB Canada Working Group Environmental Epidemiology IUF-Leibniz Research Institute for Environmental Medicine Düsseldorf Germany Department of Environment and Health School of Public Health University of Bielefeld Bielefeld Germany School of Environmental Sciences University of Guelph GuelphON Canada Retired From Eawag Swiss Federal Institute of Aquatic Science and Technology Dübendorf Switzerland Center for Sustainable Systems School for Environment and Sustainability University of Michigan Ann ArborMI United States Climate Research Finnish Meteorological Institute Helsinki Finland Indian Academy of Wood Science Bengaluru India Chemical and Biomolecular Engineering North Carolina State University RaleighN

This work is not a product of the U.S. Government or the U.S. Environmental Protection Agency, and the author is not doing this work in any governmental capacity. This research was not performed or funded by EPA and was not subject to EPA’s quality system requirements. The views expressed in this journal article are those of the author(s) and do not necessarily represent the views or the policies of the U.S. Environmental Protection Agency. The original article has been corrected. © The Author(s), under exclusive licence to the European Photochemistry Association, European Society for Photobiology 2025.

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Microwave-assisted hydrothermal synthesis of NiO-Ce1-xEuxO2-δ powders for fuel cell catalytic anodes

Microwave-assisted hydrothermal synthesis of NiO-Ce1-xEuxO2-...

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Symposium on Nanotechnology General Session - 225th ECS Meeting

作者： Medeiros, A.L. Martinelli, A.E. Melo, D.M.A. Orlandi, M.O. Macedo, D.A. Materials Science and Engineering Postgraduate Program UFRN Natal59072-970 Brazil Institute of Chemistry UNESP Araraquara14801-907 Brazil Department of Materials Engineering UFPB João Pessoa58051-900 Brazil

ISBN: (纸本)9781607685869

CeO2-based materials doped with rare earth (TR+3) can be used as alternative to traditional NiO-YSZ anodes in solid oxide fuel cells as they have higher ionic conductivity and lower ohmic losses compared to YSZ. Moreover, they allow fuel cell operation at lower temperatures (500-800°C). In the anode composition, the concentration of NiO acting as catalyst in YSZ provides high electrical conductivity and high electrochemical activity of reactions, promoting internal reform in the cell. In this work, NiO - Ce1-xEuxO2-δ compounds (x = 0.1, 0.2 and 0.3) have been synthesized by microwave-assisted hydrothermal method. The materials were characterized by TG, XRD, TPR and SEM-FEG techniques. The refinement of data obtained by X-ray diffraction showed the presence of ceria doped with europium crystallized in a cubic phase with fluorite structure, in addition to the presence of NiO. The microwaveassisted hydrothermal method showed significant reduction in the average particle size and good mass control of phase compositions compared to other chemical synthesis techniques. © The Electrochemical Society.

关键词： Nickel oxide

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Surface analysis of different wood polymer composites exposed to artificial weathering

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Journal of Wood Chemistry and Technology 2024年第2期44卷 88-101页

作者： Andrey Pereira Acosta Sandro Campos Amico Rafael de Avila Delucis André Luiz Missio Marlon bender bueno Rodrigues Ana Carolina Rodrigues Ribeiro Matheus de Paula Goularte Darci Alberto Gatto a PostGraduate Program in Mining Metallurgical and Materials Engineering Federal University of Rio Grande do Sul Porto Alegre Brazil b PostGraduate Program in Materials Science and Engineering Federal University of Pelotas Pelotas Brazil c Materials Engineering Undergraduate Course Federal University of Pelotas Pelotas Brazil

This study presents a superficial analysis of different wood polymer composites (WPC) comprising polystyrene (WPSC), poly(furfuryl alcohol) (WPFAC), and pine resin (WPRC) when exposed to artificial weathering. The study investigates the influence of resin type on the composites, focusing on their chemical, colorimetric, morphological, and thermal properties. The main findings indicate WPSC exhibits poor resistance to weathering, allowing ultraviolet radiation damage on the lignocellulosic component of the composite, leading to oxidized groups formation. Conversely, WPFAC and WPRC demonstrate good wood protection capabilities by preventing significant deterioration of holocellulose and acting as filters for radiation and moisture. Moreover, WPFAC exhibits the lowest decrease in carbonyl index and O/C ratio, with reductions of 2.6 and 11.6%, respectively. These findings are significant as they demonstrate that poly(furfuryl alcohol) and pine resin can be used to produce WPCs that delay and mitigate wood degradation by weathering, contributing to the increased potential utilization of *** AbstractDisplay full size

关键词： Chemical changes discoloration surface color UV degradation

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In-plane mechanical properties of ductile composites with unidirectional stainless steel fibre reinforced layers 16

In-plane mechanical properties of ductile composites with un...

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16th European Conference on Composite materials, ECCM 2014

作者： Allaer, K. De baere, I. Van Paepegem, W. Degrieck, J. Department of Materials Science and Engineering Faculty of Engineering and Architecture Ghent University Technologiepark 903 ZwijnaardeB-9052 Belgium SIM Program NanoForce Technologiepark 935 ZwijnaardeB-9052 Belgium

Innovative continuous stainless steel fibre filaments with a 30μm diameter allow the production of ductile composite laminates exhibiting high strain-to-failure behaviour. This study introduces unidirectional stainless steel fibre reinforced epoxy composites and reports the mechanical behaviour under quasi-static tension and compression in both principle material directions, along with the in-plane shear properties. In-plane mechanical properties, including elastic moduli and strengths were determined by use of resistance strain gauge measurements and Digital Image Correlation (DIC) technique, providing full field strain maps during loading and identifying local strain concentrations. The damage morphology of failed specimens loaded in different directions was examined using both optical microscopy and Scanning Electron Microscopy (SEM), identifying the principle features of failure.

关键词： Stress-strain curves

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S3M: A suggestion mechanism for semantic web service composition 15

S3M: A suggestion mechanism for semantic web service composi...

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21st brazilian Symposium on Multimedia and the Web, WebMedia 2015

作者： busanello Da Silva, Diogo P. Weber, Mathias Henrique Siqueira, Frank Department of Informatics and Statistics Federal University of Santa Catarina Florianópolis Brazil Postgraduate Program on Materials Science and Engineering Federal University of Santa Catarina Florianópolis Brazil

ISBN: (纸本)9781450339599

Web Service composition is a complex and error-prone process that requires the support of software tools in order to become feasible. Composition tools can help a developer to select compatible services from vast service repositories, taking into account characteristics such as port compatibility, availability, cost, and so on. This paper describes S3M, a service suggestion mechanism that, coupled with the CVFlow workflow editor, helps developers to select services and to build compositions. Service suggestions are given to the user taking into account the semantic description of Web Services in SAWSDL format. © 2015 ACM.

关键词： Websites

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Microstructure and wear resistance of spray-formed supermartensitic stainless steel

Microstructure and wear resistance of spray-formed supermart...

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作者： Zepon, Guilherme Kiminami, Claudio Shyinti Filho, Walter José botta bolfarini, Claudemiro Postgraduate Program in Science and Materials Engineering Federal University of São Carlos - UFSCar São Carlos SP Brazil Department of Materials Engineering Federal University of São Carlos - UFSCar São Carlos SP Brazil

Since the early 90's the oil industry has been encouraging the development of corrosion and wear resistant alloys for onshore and offshore pipeline applications. In this context supermartensitic stainless steel was introduced to replace the more expensive duplex stainless steel for tubing applications. Despite the outstanding corrosion resistance of stainless steels, their wear resistance is of concern. Some authors reported obtaining material processed by spray forming, such as ferritic stainless steel, superduplex stainless steel modified with boron, and iron-based amorphous alloys, which presented high wear resistance while maintaining the corrosion performance. The addition of boron to iron-based alloys promotes the formation of hard boride particles (M2b type) which improve their wear resistances. This work aimed to study the microstructure and wear resistance of supermartensitic stainless steel modified with 0.3 wt. (%) and 0.7 wt. (%) processed by spray forming (SF-SMSS 0.3%b and SF-SMSS 0.7%b, respectively). These boron contents were selected in order to improve the wear resistance of supermartensitic stainless steel through the formation of uniformly distributed borides maintaining the characteristics of the corrosion resistant matrix. SF-SMSS 0.7%b presents an abrasive wear resistance considerably higher than spray-formed supermartensitic stainless steel without boron addition (SF-SMSS). © 2013.

关键词： Wear resistance

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Electrical properties of lanthanum silicate apatite electrolytes prepared by an innovative chemical route

Electrical properties of lanthanum silicate apatite electrol...

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Symposium on Nanotechnology General Session - 225th ECS Meeting

作者： Macedo, G.L.S. Macedo, D.A. Rajesh, S. Martinelli, A.E. Figueiredo, F.M.L. Marques, F.M.b. Nascimento, R.M. Department of Chemical Engineering UFRN Natal59078-970 Brazil Department of Materials Engineering UFPB João Pessoa58051-900 Brazil Dept. of Materials and Ceramic Eng. CICECO University of Aveiro 3810-193 Portugal Materials Science and Engineering Postgraduate Program UFRN 59078-970 Brazil

ISBN: (纸本)9781607685869

This work reports the synthesis of apatite-type lanthanum silicate powders with nominal composition La10Si6O27 by an innovative chemical route which combines co-precipitation and sol-gel approaches. The herein proposed synthetic procedure is advantageous in reducing energy consumption and processing time, key elements to decrease the total manufacturing cost. The asprepared powder was calcined between 500 and 900 °C. Structure of the calcined powders, characterized by X-ray diffraction (XRD) and Rietveld refinement, indicated the formation of apatite crystalline lanthanum silicate with minor amount of L2O3 at 900 °C. The apatite powder was further analyzed by scanning electron microscopy (SEM). The effect of sintering temperature, ranging from 1400 to 1450 °C, on the electrical properties was investigated by impedance spectroscopy. Electrical measurements were recorded in the 400-800 °C temperature range. The lanthanum silicate electrolyte sintered at 1450 °C exhibited total electrical conductivity (σ700 °C = 2.12 × 10-3 ***-1) comparable with samples from literature prepared by sol-gel and freeze drying methods and sintered at 1500 °C. The results in the present study demonstrate that the co-precipitation method combined with a solgel approach is a promising alternative route to synthesize lanthanum silicate powders. © The Electrochemical Society.

关键词： Powders

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Impact Of WC Addition And High-Energy Milling Time On The Properties Of Cu-WC Composite Powders

Impact Of WC Addition And High-Energy Milling Time On The Pr...

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2024 European Powder Metallurgy Congress and Exhibition, Euro PM 2024

作者： Queiroz e Silva, Thalita Mashhadikarimi, Meysam Vieira, Pâmala Samara Marques, Anderson Costa Dos Santos Vasconcelos, Gabriel Dos Santos, Lucas Marques Materials Science and Engineering Postgraduate Program Federal University of Rio Grande do Norte Natal59078-970 Brazil School of Science and Technology Federal University of Rio Grande do Norte Natal59078-970 Brazil

ISBN: (纸本)9781899072583

Composites formed by a copper matrix, reinforced by a ceramic and refractory material, stand out due to their relevance in electrical conductor applications. In this context, this study investigated the hardening of copper powder with the addition of different concentrations of tungsten carbide (5, 10, 15 and 20% by weight) prepared by high-energy milling (HEM) for 1, 2, 5, 10 and 20 hours. The powders were characterized by SEM, XRD and Vickers microhardness. The results showed that the milling method was efficient for obtaining Cu-WC composites, with strong bonds between the phases. The diffractograms showed characteristic copper and tungsten carbide peaks, with no secondary phases. The Vickers microhardness value is directly related to the amount of WC and the milling time;consequently, the 20% WC composite powder milled for 20 hours had a microhardness of 251 HV, exceeding the values of the other powders. © European Powder Metallurgy Association (EPMA)

关键词： Microhardness

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Synthesis of green-emitting carbon quantum dots with excitation wavelength dependent photoluminescence obtained from aqueous beetroot extract

Synthesis of green-emitting carbon quantum dots with excitat...

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作者： Andrade, George R. S. Costa, Silvânio S. L. Nascimento, Cristiane C. Gimenez, Iara F. Postgraduate Program in Materials Science and Engineering Federal University of Sergipe Saõ Cristóvaõ Brazil Postgraduate Program in Chemistry Federal University of Bahia Salvador Brazil NUPEG Federal University of Sergipe Saõ Cristóvaõ Brazil Federal Institute of Education Science and Technology of Sergipe Aracaju Brazil Department of Chemistry Federal University of Sergipe Saõ Cristóvaõ Brazil

In this work, 3 simple, fast, labour and energy efficient methodologies were used to prepare carbon quantum dots (C-dots) using a red beetroot (beta vulgaris subsp. vulgaris var. vulgaris) aqueous extract as the carbon source: Alkali-assisted (AA), microwave-assisted (MA) and alkali-microwave-assisted (AMA) synthesis. TEM images shows nanoparticles with a nearly spherical morphology and diameters around 7.0 nm. FTIR spectra show characteristic peaks of C-H, C-O, O-H and C=C bonds for all the samples. The emission spectra show an interesting feature of the as-prepared samples: The emission band position can be tunable by changing the excitation wavelength. Comparing the 3 different methodologies in terms of photoluminescence properties, the one based only on the microwave-assisted heating has showed the most improved emission. © 2016 materials Research Society.

关键词： Semiconductor quantum dots

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