469 research outputs found
Comparison of the induction of pulmonary neoplasms in Sprague-Dawley rats by fission neutrons and radon daughters
Lung carcinomas in Sprague-Dawley rats after exposure to low doses of radon daughters, fission neutrons, or γ-rays
Archivo Eduardo Torroja. La sede del itcc (1949-1953). Inéditos anteproyectos previos a su construcción
El contenido de este artículo representa el eslabón que falta en la historia publicada por la revista Informes de la Construcción sobre el proyecto y construcción de la nueva sede del Instituto, que fue el hábitat de investigación más innovador jamás construido por la Modernidad. Su difusión completa y cierra esta historia, a la vez que potencia el mensaje que Eduardo Torroja quiso transmitir agrupando los artículos que relatan esta historia, bajo un mismo título común; “El Instituto es Así”, seguramente porque durante mucho tiempo (1949-1953), defendió que no podía ser de otra manera
Dynamics of simple liquids at heterogeneous surfaces : Molecular Dynamics simulations and hydrodynamic description
In this paper we consider the effect of surface heterogeneity on the slippage
of fluid, using two complementary approaches. First, MD simulations of a
corrugated hydrophobic surface have been performed. A dewetting transition,
leading to a super-hydrophobic state, is observed for pressure below a
``capillary'' pressure. Conversely a very large slippage of the fluid on this
composite interface is found in this superhydrophobic state. Second, we propose
a macroscopic estimate of the effective slip length on the basis of continuum
hydrodynamics, in order to rationalize the previous MD results. This
calculation allows to estimate the effect of a heterogeneous slip length
pattern on the composite interface. Comparison between the two approaches are
in good agreement at low pressure, but highlights the role of the exact shape
of the liquid-vapor interface at higher pressure. These results confirm that
small variations in the roughness of a surface can lead to huge differences in
the slip effect. On the basis of these results, we propose some guidelines to
design highly slippery surfaces, motivated by potential applications in
microfluidics.Comment: submitted to EPJ
Drop impact upon micro- and nanostructured superhydrophobic surfaces
We experimentally investigate drop impact dynamics onto different
superhydrophobic surfaces, consisting of regular polymeric micropatterns and
rough carbon nanofibers, with similar static contact angles. The main control
parameters are the Weber number \We and the roughness of the surface. At small
\We, i.e. small impact velocity, the impact evolutions are similar for both
types of substrates, exhibiting Fakir state, complete bouncing, partial
rebouncing, trapping of an air bubble, jetting, and sticky vibrating water
balls. At large \We, splashing impacts emerge forming several satellite
droplets, which are more pronounced for the multiscale rough carbon nanofiber
jungles. The results imply that the multiscale surface roughness at nanoscale
plays a minor role in the impact events for small \We \apprle 120 but an
important one for large \We \apprge 120. Finally, we find the effect of
ambient air pressure to be negligible in the explored parameter regime \We
\apprle 150Comment: 8 pages, 7 figure
Do two intravenous iron sucrose preparations have the same efficacy?
Background. Intravenous (i.v.) iron sucrose similar (ISS) preparations are available but clinical comparisons with the originator iron sucrose (IS) are lacking
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