Materials Literature
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Uma variedade de suportes de óxidos metálicos em catalisadores foram sintetizados visando sua utilização na reforma a vapor do etanol para produção de uma mistura rica em hidrogênio para ser empregado nas células a combustível. Os catalisadores foram preparados pelos métodos da coprecipitação e geleificação interna, u…
A reação entre resinas epóxi e polialquileno glicóis gera um aduto de elevado peso molecular que pode ter aplicações em diferentes segmentos, tais como polímeros usados na composição base de fluidos de têmpera, viscosificantes para lubrificantes e desemulsificantes de petróleo. As condições envolvendo a formação deste…
Neste trabalho, foram empregadas duas resinas comerciais de caráter fortemente básico. Ambas tendo como base copolímeros de estireno e divinilbenzeno (DVB), sendo que a VPOC 1950 contém em sua composição grupos quaternários de amônio do tipo 1, que apresentam três grupos metila e a VPOC 1960 grupos quaternários de amô…
Elastomers are increasingly used as engineering materials due to their high manufacturability, low weight, low cost and excellent mechanical properties. During the service, elastomer degradation can occur as the result of interaction with the environment. In the case of exposure to aggressive liquids or solvents such…
International audience
This specification covers a butyl rubber in the form of molded rings, compression seals, o-ring cord, and molded-in-place gaskets for aeronautical and aerospace applications. As AMS3238 is no longer valid for O-rings. For O-rings, the requirements of AMS7338 shall be met wherever AMS3238 is specified.
A weekly roundup of information on newly offered instrumentation, apparatus, and laboratory materials of potential interest to researchers.
In this paper, we report the measurement of skin friction drag on superhydrophobic-coated flat plates in high Reynolds (Re) number boundary layer flows, using a high-speed towing tank system. Aluminum flat plates with a large area (4 feet × 2 feet, 3/8 in. thick) and sharpened leading/trailing edges (1 in. long) were…
There are many theories that explain diffraction phenomena, but the simplest one is the Huygens-Fresnel theory, which is surprisingly accurate in most cases. This theory is sufficient to explain all diffraction effects appearing in optical systems, with the exception of the value of the resulting phase. If any of the…
Velma I. Grover is an Adjunct at the Arcelor Mittal DOFASCO School of Engineering and Public Policy at McMaster University in Hamilton, Canada, and an Adjunct Professor at the Faculty of Environmental Studies at York University in Toronto. Velma has worked with nonprofi t organizations, consulting companies and intern…
The prelims comprise: Half Title Title Copyright Contents Preface Acknowledgements
Liberda EN, Cuevas AZ, Gillespie PA, Gruing G, Qu Q, Chen LC. Exposure to inhaled nickel nanoparticles causes a reduction in number and function of bone marrow endothelial progenitor cells. Inhal T...
Several important relations in thick optical systems may be found with only the definitions of effective focal length and Lagrange’s theorem. This chapter considers the simplest case of a system of two thin lenses separated by a finite distance. The Lagrange invariant in a system of thin lenses may adopt another form…
FIBO 2013 – Erstmals mit physiotag Vom 11. bis 14. April 2013 findet die FIBO, die weltweit führende Messe für Fitness, Wellness und Gesundheit, in der koelnmesse in Köln statt. In diesem Jahr gibt es zum ersten Mal einen Programmpunkt, der sich speziell an Physiotherapeuten richtet: den physiotag am 13. April, den de…
Established in 1964, the IUCN Red List of Threatened Species has evolved to become the world’s most comprehensive information source on the global conservation status of animal, fungi and plant species.
No presente trabalho, buscou-se avaliar as mudanas promovidas pela substituio parcial e total de TiO 2 por GeO 2 em vidros niobofosfato co-dopados com Er 3+ /Yb 3+ previamente estudados
Rapid growth in production of automobiles has increased emissions. Automotive control engineers use innovative control techniques to meet the upcoming emission standards. This paper proposes a novel method of employing artificial neural network (ANN) based predictive controller design. The controller predicts the inje…
Capillary pressure exists whenever reservoir rock pores, which are of capillary sizes, are saturated with two or more immiscible fluid phases.1 In 1941, Leverett2 first stated that the interfacial boundary between two immiscible fluid phases present in a porous medium is curved due to IFT between the fluids. He ascrib…
International audience
A comunidade fitoplanctônica pode ser regulada pelos controles bottom-up (nutrientes) e top-down (predadores). A disponibilidade de nutrientes vem sendo considerada como o fator mais expressivo nesta regulação, entretanto, estudos mostram que o fitoplâncton também pode ser fortemente regulado pelo zooplâncton. Experim…