Accelerated Exposure
Mostrando 1-12 de 160 artigos, teses e dissertações.
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1. SALICILATOS COMO INIBIDORES DO PROCESSO OXIDATIVO MEDIADO POR COBRE E FERRO NO BIODIESEL B100
Biodiesel is a renewable fuel produced from vegetable oils and animal fats transesterification. However, due to its chemical characteristics, it is susceptible to oxidation causing losses to its manufacturers and users. In this work a series of salicylates were synthesized and employed as secondary antioxidants in biodiesel B100. The accelerated oxidation te
Química Nova. Publicado em: 2022
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2. Lignin-modified road marking paint: weathering aging studies
Abstract The accelerated artificial aging with ultraviolet radiation, viscosity, density, no-pick-up time, flexibility, and abrasion resistance of lignin-modified road marking paint were evaluated. The addition of lignin did not cause significant changes in the physical chemistry, flexibility and no-pick-time test compared to the precursor paint. The additio
REM, Int. Eng. J.. Publicado em: 2021-06
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3. Fat grafting associated with negative pressure wound therapy
Abstract Purpose: To describe a case report of FG associated with NPWT in the treatment of complex wound on the distal third of the lower limb with bone exposure. Case Report: A 59-year-old patient with chronic left tibial osteomyelitis since childhood underwent extensive debridement of the distal tibial diaphysis (40% of bone thickness per 10 cm extension
Acta Cir. Bras.. Publicado em: 28/11/2019
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4. Influence of ZnO on the properties of elastomeric compositions and their leached extract
Abstract The reductionin zinc oxide (ZnO) content in elastomeric compositions has become a subject due to the deleterious effect of zinc ions on aquatic organisms. The purpose of this study was to develop elastomeric compositions containing 0, 1, 3 and 5 phr of ZnO aiming at assessing the influence of the different contents on the rheometric, mechanical and
Polímeros. Publicado em: 04/11/2019
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5. Revisão sobre ensaios acelerados para indução da corrosão desencadeada por cloretos em concreto armado
Resumo A corrosão de armaduras desencadeada por cloretos é um dos principais problemas que afetam as estruturas de concreto armado. Considerando o estudo desse tipo de problema, a velocidade na coleta dos dados, a possibilidade de controle das variáveis que influenciam o processo de corrosão e o baixo custo na realização dos testes têm sido aspectos m
Ambient. constr.. Publicado em: 03/10/2019
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6. Durability of Concrete After Fire Through Accelerated Carbonation Tests
Degradation of mechanical properties and durability of reinforced concrete structures occur when they are subjected to fire situations, depending on the characteristics of the material, fire duration and the ways of fire extinguishing. Mechanical properties such as compressive strength, tensile strength and elasticity modulus are some examples of typically a
Mat. Res.. Publicado em: 18/07/2019
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7. Corrodibility and Adherence of Reinforced Concrete Rebars Electroplated with Zinc and Zinc-Nickel Alloys
Reinforced concrete is the main structural material used in the world in the construction of bridges, roads and commercial and residential buildings. One effective method for preventing corrosion of steel reinforcement is the application of galvanic coatings to the reinforcement itself. The present study evaluated the performance of three groups of reinforci
Mat. Res.. Publicado em: 15/07/2019
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8. Why do Latin American firms hold so much more cash than they used to?
Resumo Este estudo avalia se as teorias de trade-off ou pecking order explicam o aumento dos índices de caixa em empresas latino-americanas. Ele também avalia o poder explicativo de variáveis adicionais que identificam características macroeconômicas fundamentais nas economias latino-americanas. Por causa de seu notável aumento, o caixa se tornou uma c
Rev. contab. finanç.. Publicado em: 2019-03
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9. Effect of radiant exposure and UV accelerated aging on physico-chemical and mechanical properties of composite resins
Abstract Currently, there is no consensus in terms of defining the minimum radiant exposure values necessary for achieving adequate properties of composite resin. In addition, the long-term influence that radiant exposure has on the properties of composite resins is still questionable. Objective: The objective of this study was to evaluate the effect of radi
J. Appl. Oral Sci.. Publicado em: 07/01/2019
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10. Aging simulation of the tailings from Stava fluorite extraction by exposure to gamma rays
Abstract Tailings storage facilities are disposal systems for storing the waste products of the mining industry consisting of a slurry mixture made of soil, rock and water that remain after the mineral values have been removed from the patent ore. Tailings dams are supposed to last forever, so after their deposition, tailings can experience aging processes w
REM, Int. Eng. J.. Publicado em: 2017-12
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11. Effects of vacuum sealing drainage on the treatment of cranial bone-exposed wounds in rabbits
This study was designed to assess the efficacy of vacuum sealing drainage (VSD) on skull exposure wounds in rabbits and to investigate the underlying mechanism of the process. Full-thickness excisional circular wounds 2×2 cm with or without periosteum involvement were created in 88 New Zealand white rabbits (mean body weight: 3.0±0.65 kg). Animals were ran
Braz J Med Biol Res. Publicado em: 02/10/2017
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12. INFLUÊNCIA DO ENVELHECIMENTO ACELERADO EM FLARES MAGNÉSIO/PTFE/FPM
Magnesium/PTFE/FPM decoy flares, also named conventional flares, were designed in order to protect combat aircraft from the threat caused by infrared-guided missiles. Adverse storage or transport conditions may cause reactions that deteriorates chemical properties of the conventional flares, causing the aging and compromising its performance. The aim of this
Quím. Nova. Publicado em: 2017-09