Browsing Exact and Earth Sciences by Title
Now showing items 3562-3581 of 6198
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Nacoes, nacionalidades e a questao federativa : o debate teorico nos campos do liberalismo e do marxismo
(1994) [Journal article] -
Nanoarchitectured composite of polysulfone and carbon-based fillers bearing magnetically stimulable function for efficient CO2 capture
(2024) [Journal article]Mitigating the global warming caused by CO2 emissions from anthropogenic sources is a hot research topic in the current era. The high cost and difficulty in handling liquid solvent absorbents for CO2 capture are the main ... -
Nanobeams and AFM subject to piezoelectric and surface scale effects
(2018) [Journal article]Vibration dynamics of elastic beams that are used in nanotechnology, such as atomic force microscope modeling and carbon nanotubes, are considered in terms of a fundamental response within a matrix framework. Te modeling ... -
Nanoemulsion improves the antifungal activity of allylic thiocyanates against yeasts and filamentous pathogenic fungi
(2018) [Journal article]We report the antifungal and antichemotactic activities of a series of allylic thiocyanates with low toxicity. We also show improved antifungal activity of the most promising compound when used in a nanoemulsion (NE). The ... -
Nano-microstructured, superhydrophobic, and infrared transparent polytetrafluoroethylene/diamond films
(2013) [Journal article]A self-assembled polytetrafluoroethylene (PTFE) nanostructure is deposited on microcrystalline diamond (MCD) films, by use of physical and chemical vapor deposition in a two-step process, to produce (fully) superhydrophobic ... -
Nanoparticle-coated organic-inorganic microparticles : experimental design and gastrointestinal tolerance evaluation
(2006) [Journal article]The influences of the spray-drying parameters and the type of nanoparticles (nanocapsules or nanospheres) on the characteristics of nanoparticle-coated diclofenac-loaded microparticles were investigated by using a factorial ... -
Nano-porosity in GaSb induced by swift heavy ion irradiation
(2014) [Journal article]Nano-porous structures form in GaSb after ion irradiation with 185 MeV Au ions. The porous layer formation is governed by the dominant electronic energy loss at this energy regime. The porous layer morphology differs ... -
Nanoscale density fluctuations in swift heavy ion irradiated amorphous SiO2
(2011) [Journal article]We report on the observation of nanoscale density fluctuations in 2 μm thick amorphous SiO2 layers irradiated with 185 MeV Au ions. At high fluences, in excess of approximately 5 1012 ions=cm², where the surface is completely ... -
Nanoscale sliding friction versus commensuration ratio : molecular dynamics simulations
(2006) [Journal article]The pioneer work of Krim and Widom [Phys. Rev. B 38, 12184 (1988)] unveiled the origin of the viscous nature of friction at the atomic scale. This generated extensive experimental and theoretical activity. However, fundamental ... -
Nanostructure-coated diclofenac-loaded microparticles: preparation, morphological characterization, in vitro release and in vivo gastrointestinal tolerance
(2005) [Journal article]Micropartículas com revestimento nanoestruturado, contendo diclofenaco, foram preparadas e caracterizadas apresentando um rendimento de 80% e taxa de encapsulação de 83%. A análise morfológica (MEV) permitiu a visualização ... -
Nanostructured systems containing an essential oil : protection against volatilization
(2011) [Journal article]The goal of this study was to evaluate the feasibility of preparing nanocapsules and nanoemulsions using tea tree oil as oily phase aiming to protect its volatilization. The nanostructures presented nanometric mean size ... -
A nanotecnologia como estratégia para o desenvolvimento de cosméticos
(2013) [Journal article] -
Nanotubos de TiO2 dopados com nitrogênio : comparação das atividades fotocatalíticas de materiais obtidos através de diferentes técnicas
(2012) [Journal article]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 ... -
A não-modernidade de Bruno Latour e suas implicações para a Educação em Ciências
(2018) [Journal article]Neste trabalho, propomos a visão não-moderna de Bruno Latour como referencial teórico para fundamentar a Educação em Ciências. Apresentamos os conceitos basilares de sua teoria, partindo da Antropologia Simétrica e suas ... -
Não tem saída fácil : tensão entre autonomia epistêmica e confiança na ciência como caminho para a educação em ciências contemporânea
(2024) [Journal article]Neste artigo, apresentamos um estudo empírico que tem como objetivo geral problematizar a tensão entre autonomia epistêmica e confiança na ciência, bem como os compromissos epistêmico-políticos de diferentes correntes ... -
Natural green coating inhibits adhesion of clinically important bacteria
(2015) [Journal article]Despite many advances, biomaterial-associated infections continue to be a major clinical problem. In order to minimize bacterial adhesion, material surface modifications are currently being investigated and natural products ... -
Natural language syntax learning and syntactic guided spelling repair
(1991) [Journal article]It is impossible to define a priori a set of rules to describe alI syntacti cally valid sentences and a dictionary having ali the words a user may write for consul tirig a Natural Language Interface (NLI) for a given ... -
Nature of insoluble material found in the bottom of soybean biodiesel storage tank : chemical and microbiological approach
(2018) [Journal article]During biodiesel storage, chemical reactions may occur, producing sludges. The aim of this study was to characterize the chemical and microbial composition of the sludge found in a biodiesel storage tank. The material was ... -
Nature of insulating state in the three-band hubbard model : a tight-binding approach
(1995) [Journal article]We study the three-band Hubbard model, commonly used to describe the copper-oxygen planes of high-Tc superconductors, from the point of view of electronic properties. Utilizing perturbation theory around the atomic limit ... -
Nature of long-range order in stripe-forming systems with long-range repulsive interactions
(2015) [Journal article]We study two dimensional stripe forming systems with competing repulsive interactions decaying as r−α.We derive an effective Hamiltonian with a short-range part and a generalized dipolar interaction which depends on the ...
