Navegação Engenharias por Título
Resultados 1548-1567 de 2397
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Nafion/sulfonated poly(indene) polyelectrolyte membranes for fuel cell application
(2018) [Artigo de periódico]Sulfonated poly(indene) (SPInd), with 35% and 45% degree of sulfonation, was blended with Nafion to prepare blended membranes with 10, 15 and 20 wt.% of SPInd. Membranes were evaluated by infrared spectroscopy, thermogravimetric ... -
Nanocomposite of photocurable epoxy-acrylate resin and carbon nanotubes : dynamic-mechanical, thermal and tribological properties
(2012) [Artigo de periódico]In this study, the thermal, dynamic-mechanical and tribological behavior of nanocomposites of a photocurable epoxy-acrylate resin and multiwalled carbon nanotubes (MWCNT) are investigated. A route consisting of a combination ... -
Nanoporous SiO 2 / Si thin layers produced by ion track etching : dependence on the ion energy and criterion for etchability
(2008) [Artigo de periódico]Vitreous SiO2 thin films thermally grown onto Si wafers were bombarded by Au ions with energies from 0.005 to 11.1 MeV/u and by ions at constant velocity 0.1 MeV/u 197Au, 130Te, 75As, 32S, and 19F . Subsequent chemical ... -
Nanotubos de TiO2 dopados com nitrogênio : comparação das atividades fotocatalíticas de materiais obtidos através de diferentes técnicas
(2012) [Artigo de periódico]TiO2 nanotubes were synthesized by hydrothermal method and doped with three nitrogen compounds to enhance photocatalytic activity under visible light. Catalysts were characterized by X-ray diffraction (XRD), transmission ... -
Natural ageing of polyaramide fiber from ballistic armor
(2019) [Artigo de periódico]Ballistic armor has been manufactured primarily based on polyaramide (Kevlar and Twaron) or Dyneema but the lifespan warranty in Brazil is only 5 years and after this time period they are incinerated or comminuted and ... -
Nature-based Solutions (NbS) for increasing urban greening and reducing runoff flows in narrow streets
(2024) [Artigo de periódico]When we explore Nature-based Solutions (NbS) and their implementation in small cities with narrow streets and sidewalks as a feature of their historical cores, we can discover several challenges in terms of sustainability ... -
A natureza dual das imagens digitais
(2023) [Artigo de periódico]Em diversas áreas do conhecimento – entre elas o Design – representar tornou-se um recurso incontornável em termos de comunicação. Entre as dificuldades em representar algo, está a possibilidade de dualidade, um princípio ... -
A neuro-fuzzy system for characterization of arm movements
(2013) [Artigo de periódico]The myoelectric signal reflects the electrical activity of skeletal muscles and contains information about the structure and function of the muscles which make different parts of the body move. Advances in engineering have ... -
A new adaptive analog test and diagnosis system
(2000) [Artigo de periódico]This paper presents a low-cost analog test system with diagnosis capabilities. The tester is able to detect faults in any linear circuit by learning a reference circuit behavior in a first step, and comparing this behavior ... -
New ASPN high efficiency treatment of ASTM M2 steel
(2021) [Artigo de periódico]Plasma nitriding treatments are applied to achieve excellent surface properties on steel parts and tools. Active screen plasma nitriding (ASPN) does not have the defects presents in direct nitriding plasma treatments (DCPN). ... -
A new assessment in the simultaneous optimization of friction dampers in plane and spatial civil structures
(2017) [Artigo de periódico]This paper presents a methodology to improve installation of friction dampers in civil structures subjected to artificial and real earthquakes using a metaheuristic optimization technique. The Firefly Algorithm is used in ... -
A new empirical viscosity model for composed suspensions used in experiments of sediment gravity flows
(2021) [Artigo de periódico]Sediment gravity flows are natural flows composed by water and sediment in which the gravitational flow acts on the sediment. The distinct physical properties of the cohesive (clay) and non-cohesive (sand) sediment, and ... -
A new methodology for optimal design of hybrid vibration control systems (MR + TMD) for buildings under seismic excitation
(2023) [Artigo de periódico]This study proposes a new methodology, based on the optimization procedure by a metaheuristic algorithm, for designing a hybrid vibration control system to mitigate the dynamic response of buildings under nonstationary ... -
A new non-complex synthesis of NiO nanofoams for hydrogen storage applications
(2023) [Artigo de periódico]The use of nanofoams is beneficial for a wide range of applications ranging from catalysis to plasmonics. The present communication reports on the non-complex synthesis of NiO nanofoams and their use for hydrogen storage ... -
New proposal to calculate the friction in sheet metal forming through bending under tension test
(2019) [Artigo de periódico]There are 6 different types of equations that have been formulated to measure friction through the bending under tension test, however, there is no work to show whether these calculations actually represent what is happening ... -
A new scenario-based framework for conflict resolution in water allocation in transboundary watersheds
(2019) [Artigo de periódico]One of the main causes of water conflicts in transboundary watersheds all over the world is represented by the increasing water demand due to urban, industrial, and agricultural development. In this context, water scarcity ... -
New sol-gel formulations to increase the barrier effect of a protective coating against the corrosion and wear of galvanized steel
(2015) [Artigo de periódico]This study proposes a new pretreatment method that uses alkoxide precursors with a plasticizing agent; the purpose of this study is to improve the electrochemical and mechanical properties of a galvanized steel surface. ... -
Niobium and niobium-iron coatings on API 5LX 70 steel applied with HVOF
(2014) [Artigo de periódico]The present study aimed to create and characterize niobium and niobium-iron60% coatings applied to steel API 5L X70 using the hypersonic thermal spray process (HVOF). The morphologies of the coatings were analyzed using ... -
Níveis de riscos e Vibração Mão-Braço (VMB) em máquinas de corte de grama
(2019) [Artigo de periódico]Existe um grande número de equipamentos e máquinas que são operados manualmente por humanos e que expõem seus usuários a determinados níveis de ruído e vibração, durante o uso, tais como: parafusar, forjar, retificar, ... -
O nível de serviço do Tecon Rio Grande pela ótica dos exportadores e importadores
(2013) [Artigo de periódico]A competitividade das empresas no contexto internacional depende, entre outros fatores, do aprimoramento de seu processo logístico como um todo. E tal processo está fortemente relacionado ao modal marítimo, uma vez que ...
