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materials science and Technology 2018, MS and T 2018

作者： Andrade, Malena Aissa De Oliveira, bráulio Salumão Milanez, Douglas Henrique Leiva, Daniel Rodrigo Zepon, Guilherme Materials Engineering Department Federal University of São Carlos Rodovia Washington Luis km 235 São Carlos. São Paulo State Brazil Center for Technological Information in Materials Federal University of São Carlos Rodovia Washington Luis km 235 São Carlos. São Paulo State Brazil Postgraduate Program in Materials Science and Engineering Federal University of São Carlos Rodovia Washington Luis km 235 São Carlos. São Paulo State Brazil

ISBN: (纸本)0873397681

Low-density steels are studied aiming to increase the specific strength and consequently decrease automobile weight. Scientific and technological indicators can be elaborated based on information contained in articles and patent documents and assists to detect trends in emerging topics. This study evaluated recent developments in low-density steel alloys through bibliometric techniques. The results show Japan, South Korea, China, Germany and USA as the main players. Ductility and corrosion resistance figures as important technological challenges apart from strengthening. beyond aluminum, manganese and carbon - mainly used for density reduction - silicon and chromium stand out as the main alloying elements studied for stacking fault energy control. The indicators suggest that new technologies and its insights shall be expected and monitored in near future, mainly for supporting material selection and R&D decision makings. Copyright © 2018 MS&T18®

关键词： Corrosion resistance

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Incorporation of Oregano Essential Oil Microcapsules in Starch-Poly (butylene Adipate Co-Terephthalate) (PbAT) Films

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Macromolecular Symposia 2019年第1期383卷

作者： de Medeiros, João Augusto Salviano blick, Ana Paula Galindo, Marcella V. Alvim, Izabela D. Yamashita, Fabio Ueno, Cláudio Takeo Shirai, Marianne Ayumi Grosso, Carlos Raimundo Ferreira Corradini, Elisângela Sakanaka, Lyssa Setsuko Federal University of Technology of Paraná − Department of Materials Engineering LondrinaParana Brazil Londrina State University − Department of Food Science and Technology Londrina Parana Brazil Federal University of Technology of Paraná − Department of Food Technology LondrinaParana Brazil Institute of Food Technology − Bakery and Confectionary Technology Center LondrinaParana Brazil Federal University of Technology of Paraná − Postgraduate Program in Food Technology LondrinaParana Brazil Federal University of Technology of Paraná − Postgraduate Program in Materials Science and Engineering LondrinaParana Brazil

Summary Cassava starch and poly(butylene adipate-co-terephthalate) (PbAT) based films containing microencapsulated oregano essential oil (OEO) and free OEO are produced by blow extrusion. Microcapsules produced by ionic gelation were characterized with respect to average size, morphology, and encapsulation efficiency. The microcapsules were spherical and ranged in size from 20 to 1000 μm. Encapsulation efficiency (EE) is 83%. The films are analyzed in terms of their morphology, mechanical properties, water vapor permeability (WVP) and antibacterial properties. The films containing OEO microcapsules exhibited lower ultimate tensile strength, Young's modulus and elongation at break than the control films and the films containing free OEO. The WVP of films containing free OEO is slightly lower, while that of films containing microencapsulated OEO did not differ significantly from the control films. Scanning electron microscopy (SEM) images showed that the surface of films containing microencapsulated OEO are less homogeneous than those of the control and free OEO films. Films containing free or microencapsulated OEO presented inhibitory activity against Staphylococcus aureus, but not against Escherichia coli. © 2019 WILEY-VCH Verlag GmbH & Co. KGaA, Weinheim

关键词： Elastic moduli

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Using sugar cane bagasse ash into clay products

Journal of Solid Waste Technology and Management

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Journal of Solid Waste Technology and Management 2012年第1期38卷 5-10页

作者： Acchar, Wilson Paranhos, Raimundo Jorge Santos Physics Department Federal University of Rio Grande Do Norte Natal-RN 59072-970 Brazil Postgraduate Program of Science and Materials Engineering University of Rio Grande Do Norte Natal-RN 59072-970 Brazil

The agro and industrial activities are currently responsible for the production of large amounts of solid wastes. The use of industrial wastes such as granite, marble, kaolin and pegmatite and agro-industrial rejects into clay products has been widely developed over the last few decades. Clay materials used in the ceramic industry exhibit a large diversification of compositions that al-low the addition of different types of waste materials to the clay mixture. Sugar cane bagasse ash (SCbA), a by-product of the sugar process, is exacerbating the environmental problem. bra-zil produces an enormous amount of sugar and the lack of adequate landfill areas available for disposal of sugar cane bagasse ash rejects poses a critical problem for the agro-industry. This work describes, for the first time, research carried out on the manufacturing of ceramic tile mate-rials with sugar cane bagasse ash additions. SCbA, consisting basically of potassium oxide, was added to the clay formulations as an alternative to feldspar. Clay with different sugar cane ba-gasse ash content was mixed and sintered. Sintered specimens were characterized by X-ray dif-fraction, density, porosity, thermal analysis and strength measurements. The results obtained showed that the sugar cane ash residue can be added to clay materials as an alternative to feld-spar, without degrading their properties.

关键词： Sintering

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A flexible ultrasonic velocity profiler development environment

A flexible ultrasonic velocity profiler development environm...

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IEEE Instrumentation and Measurement Technology Conference

作者： César Yutaka Ofuchi Fabio Rizental Coutinho Raquel dos Santos Rasia Lucia Valeria Ramos de Arruda Flávio Neves Rigoberto Eleazar Melgarejo Morales Graduate School of Electrical Engineering and Computer Science (CPGEI) Federal University of Technology-Paraná (UTFPR) Curitiba Brazil Mechanical & Materials Engineering Postgraduate Program (PPGEM) Federal University of Technology-Paraná (UTFPR) Curitiba Brazil

ISBN: (纸本)9781467363846

Ultrasonic velocity profiler method is now an accepted tool in modern experimental fluid mechanics and fluid engineering. As a relative new technology, different applications and improvements of the technique are being researched over the last years. This paper presents an environment to develop new algorithms to improve the ultrasonic velocity estimation technique. The system uses the LabVIEW modular platform integrated with mathematical script language used in many signal-processing software. The phase-shift algorithm was implemented and tested using the proposed system. The results are validated with standard velocity measurements generated by a rotating cylinder.

关键词： Acoustics Velocity measurement Software Signal processing algorithms Ultrasonic variables measurement Fluids Doppler effect

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biomedical applications of Jones-matrix tomography to polycrystalline films of biological fuids

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Journal of Innovative Optical Health sciences 2019年第6期12卷 72-84页

作者： V.A.Ushenko A.Yu.Sdobnov W.D.Mishalov A.V.Dubolazov O.V.Olar V.T.bachinskyi A.G.Ushenko Yu.A.Ushenko O.Ya.Wanchuliak I.Meglinsk Chernivtsi National University 2 Kotsiubynskyi St. Chernivtsi58012 Ukraine Faculty of Information Technology and Electrical Engineering University of Oulu Oulu 90570Finland Shupyk National Medical Academy of Postgraduate Education 9 Dorogozhytska St.Kyiv04112 Ukraine Bukovinian State Medical University 3 Theatral Sq. Chernivtsi58000 Ukraine Interdisciplinary Laboratory of Biophotonics National Research Tomsk State University Tomsk 634050 Russia Institute of Engineering Physics for Biomedicine(PhysBio)National Research Nuclear University"MEPhI"Moscow 15409 Russia Aston Institute of Materials Research School of Engineering and Applied Science Aston University BirminghamB47ETUK School of Life and Health Sciences Aston University BirminghamB47ETUK

Algorithms for reconstruction of linear and circular birefringence-dichroism of optically thin anisotropic biological layers are *** technique of Jones matrix tomography of poly-crystalline films of biological fuids of various human organs has been developed and experimentally *** coordinate distributions of phase and amplitude anisotropy of bile films and synovial fuid taken from the knee joint are determined and statistically ***(statistical moments of 3rd and 4th orders)of differential diagnostics of early stages of cholelithiasis and septic arthritis of the knee joint with excellent balanced accuracy were *** on the diagnostic fficiency of the Jones matrix tomography method for polyerystalline plasma(liver disease),urine(albuminuria)and cytological smears(cervical cancer)are presented.

关键词： Polarization Fourier optics and signal processing imaging systems medical and biological imnaging

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Transient Ruddlesden-Popper-Type Defects and Their Influence on Grain Growth and Properties of Lithium Lanthanum Titanate Solid Electrolyte

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ACS Nano 2024年第16期18卷 10850-10862页

作者： borštnar, Petruša Dražić, Goran Šala, Martin Lin, Che-An Lin, Shih-Kang Spreitzer, Matjaž Daneu, Nina Advanced Materials Department Jožef Stefan Institute Jamova cesta 39 Ljubljana1000 Slovenia Jožef Stefan International Postgraduate School Jamova cesta 39 Ljubljana1000 Slovenia Department of Materials Chemistry National Institute of Chemistry Hajdrihova 19 Ljubljana1000 Slovenia Department of Analytical Chemistry National Institute of Chemistry Hajdrihova19 Ljubljana1000 Slovenia Department of Materials Science and Engineering National Cheng Kung University Tainan70101 Taiwan Research Center National Cheng Kung University Tainan70101 Taiwan Program on Smart and Sustainable Manufacturing Academy of Innovative Semiconductor and Sustainable Manufacturing National Cheng Kung University Tainan70101 Taiwan Core Facility Center National Cheng Kung University Tainan70101 Taiwan

Lithium lanthanum titanate (LLTO) perovskite is one of the most promising electrolytes for all-solid-state batteries, but its performance is limited by the presence of grain boundaries (Gbs). The fraction of Gbs can be significantly reduced by the preparation of coarse-grained LLTO ceramics. In this work, we describe an alternative approach to the fabrication of ceramics with large LLTO grains based on self-seeded grain growth. In compositions with the starting stoichiometry for the Li0.20La0.60TiO3 phase and with a high excess addition of Li (Li:La:Ti = 11:15:25), microstructure development starts with the formation of the layered RP-type Li2La2Ti3O10 phase. Grains with many RP-type defects initially develop into large platelets with thicknesses of up to 10 μm and lengths over 100 μm. Microstructure development continues with the crystallization of LLTO perovskite, epitaxially on the platelets and as smaller grains with thinner in-grain RP-lamellae. Theoretical calculations confirmed that the formation of RP-type sequences is energetically favored and precedes the formation of the LLTO perovskite phase. At around 1250 °C, the RP-type sequences become thermally unstable and gradually recrystallize to LLTO via the ionic exchange between the Li-rich RP-layers and the neighboring Ti and La layers as shown by quantitative HAADF-STEM. At higher sintering temperatures, LLTO grains become free of RP-type defects and the small grains recrystallize onto the large platelike seed grains via Ostwald ripening. The final microstructure is coarse-grained LLTO with total ionic conductivity in the range of 1 × 10-4 S/cm. © 2024 The Authors. Published by American Chemical Society.

关键词： Solid electrolytes

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Integrated Approachs for Calcination-Free Lithium Extraction from beta-Spodumene and Synthesis of Lta-Type Zeolite: Experimental Insights and Computational Analysis

SSRN

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SSRN 2024年

作者： Dos Santos, Leonardo Leandro Do Nascimento, Rubens Maribondo Castellã Pergher, Sibele berenice Department of Chemistry Federal University of Rio Grande do Norte Natal59078970 Brazil Postgraduate Program in Materials Science and Engineering Federal University of Rio Grande do Norte Natal59078970 Brazil

This study presents a novel approach to extract lithium from beta-spodumene and synthe- size LTA-type zeolite as a by-product, with no organic solvents or calcination. The process involves solubilization with sodium salts and the recycling of the mother liquor, with lithium content quantified via atomic absorption spectroscopy (AAS) from the supernatant. Syn- thesis conditions were carefully optimized to achieve the concurrent synthesis of LTA-type zeolite, denoted as LPM-15, characterized by cubic morphology and spherical facets. Com- putational simulations using density functional theory (DFT) were employed to investigate the impact of cation exchange processes (Na+/Al3+, NH4+/Al3+, and Ca2+/Al3+) on the stability of the LPM-15 structure and molecular diffusion within its zeolitic pores. Addi- tionally, the mobility of cations within the LPM-15 was assessed through cation exchange capacity (CEC) measurements. This comprehensive approach elucidates the fundamental mechanisms underlying LTA zeolite synthesis and provides valuable insights into potential applications, particularly in water purification. © 2024, The Authors. All rights reserved.

关键词： Density functional theory

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Fatigue properties of high pressure die-cast magnesium AM60b alloy

Fatigue properties of high pressure die-cast magnesium AM60B...

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2007 World Congress

作者： Lu, Y. Taheri, F. Gharghouri, M. Materials Engineering Program Department of Process Engineering and Applied Science Dalhousie University Halifax NS B3J 2X4 Canada National Research Council Canada Canadian Neutron Beam Centre Chalk River Laboratories Chalk River ON K0J 1J0 Canada Department of Civil Engineering Dalhousie University 1360 Barrington Street Halifax NS B3J 1Z1 Canada

Magnesium castings are experiencing increased use in the transportation industry because of their high strength to weight ratio, high stiffness, and excellent castability. The casting characteristics allow complicated shapes to be cast to close tolerances with high reproducibility. As the use of magnesium castings increases, the need for research on this alloy is becomes more prevalent. Indeed, little research has been performed on magnesium alloys compared to aluminum castings. In the present study, the influence of the microstructure in a high pressure die casting AM60b magnesium auto component is investigated. Fatigue samples were removed from the component. Staircase fatigue testing was conducted first and the fracture surfaces were then examined with the scanning electron microscope. It was found that the majority of fatigue cracks initiated from sub-surface voids underneath machined surfaces, not the cast skins. Machining a specimen out of a casting causes internal voids to become sub-surface voids, which in turn causes premature fracture. In the region which is close to the fracture initiation site, extremely flat areas covered with fine fatigue striations can be easily observed. However, numerous randomly oriented serrated surfaces, indicative of rough fatigue crack growth were found near the regions farther away from the initiation site. Finally, the final fracture zone is characterized by a high level of porosity and dimples surrounding second phase particles. Copyright © 2007 SAE International.

关键词： Microstructure

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Novel spent bleaching earth industrial waste as low-cost ceramic membranes material: elaboration and characterization

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materials Today: Proceedings 2023年 87卷 136-140页

作者： Rahma A. Elma M. Roil bilad M. Isnasyauqiah Rahman Wahid A. Sirajul Huda M. Resa Lamandau D. Doctoral Program of Environemntal Science Postgraduate Program Lambung Mangkurat University Jl Brigjen H. Hasan Basri Kayutangi South Kalimantan Banjarmasin 70123 Indonesia Materials and Membranes Research Group (M2ReG) Lambung Mangkurat University Jl A. Yani Km 36 South Kalimantan Banajrbaru 70714 Indonesia Chemical Engineering Department Engineering Faculty Lambung Mangkurat University Jl A. Yani Km 36 South Kalimantan Banajrbaru 70714 Indonesia Faculty of Integrated Technologies Universiti Brunei Darussalam Gedung BE1410 Brunei Darussalam

Ceramic membrane support derived from spent bleaching earth (SbE) become a novel study due to their low-cost, sustainable features, abundance material, and there is not yet applicated as membrane. In this study, flat disk ceramic membrane configuration was fabricated and characterized from solid waste of crude palm oil bleaching process by pressing method in different SbE loading mass (38–42 %wt.). The SbE as raw material was deoiled using n-hexane and acetone solvent, followed by fabricated it become flat disk SbE membranes. Afterward, the SbE flat disk membranes was characterized through fourier-transform infrared spectroscopy (FTIR) and X-ray fluorescence (XRF) analyzer. The result exhibits the flat disk SbE ceramic membrane has dimension of 41 and 6 mm for diameter and thickness, respectively. SbE membranes indicating have montmorillonite structure due to presence of silica as main component materials of SbE. besides that, the existence of siloxane vibration band in SbE membranes for the sample after regeneration with n-hexane and acetone were dominated over using raw SbE. It concludes the oil residue was removed and produced SbE membrane properties become robust with less organic contaminant. © 2023

关键词： Ceramic membrane CPO Pressing method SbE Support

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Chemical Composition,Antioxidant and Antimicrobial Activity of the Oil and Plant Extract Myrocarpus frondosus Allemao

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American Journal of Plant sciences 2017年第7期8卷 1560-1571页

作者： Ivandra Ignês de Santi Darci Alberto Gatto Miriam Ribeiro Galvao Machado Patrícia Soares bilhalva dos Santos Rogerio Ant?nio Freitag Natural Products Research Laboratory Graduate Program in Biochemistry and Bioprospecting Federal University of Pelotas Pelotas Brasil Postgraduate Program Materials Science and Engineering Federal University of Pelotas Pelotas Brasil Center for Chemical Sciences Pharmaceutical and Food Federal University of Pelotas Pelotas Brasil Chemical and Environmental Engineering Department University of the Basque Country (UPV/EHU) San Sebastian Spain

The objective of this study was to evaluate the chemical profile of extracts (aqueous and ethanol) and the essential oil of Myrocarpus frondosus Allem?o, the sensitivity of strains of Escherichia coli, Staphylococcus aureus, Salmonella typhimurium and Listéria monocytogenes, front the extracts and essential oil, by means of the microdilution method in broth, the antioxidant activity by the AbTS method, and the content of phenolic compounds present in the extracts and oil. For the preparation of extracts from plant leaves used with ethanol and water, then separated, the chemical identification of compounds was performed by high-performance liquid chromatography (CLAE-DAD) and gas chromatography coupled to mass spectrum (CG/MS). With the chemical analysis of the extracts obtained the presence of the major compound rutin, and oil major compound was found germacrene b. In the microdilution method in broth, oil and extracts showed inhibition against all the bacteria tested in the concentrations 1 mg/ml to 0.25 mg/ml, except for Staphylococcus aureus at a concentration of 0.25 mg/ml of the essential oil and trans-caryophyllene. The results of Minimum bactericidal Concentration showed that the essential oil had bactericidal activity at a concentration of 1mg/ml for all bacteria tested and trans-caryophyllene at the same concentration only for Listeria monocytogenes. In relation to the essential oil, antioxidant activity showed higher radical reduction capacity of 40.92% and the content of phenolic compounds ethanol extract showed more 12.72%. The in vitro results support the conclusion that the essential oil is very promising both in antimicrobial action as antioxidant activity and the leaf extracts on antioxidant activity.

关键词： Myrocarpus frondosus Allemao Antimicrobial Antioxidant

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