649 research outputs found
On a modelled rough heat equation
We use the formalism of Hairer's regularity structures theory \cite{hai-14}
to study a heat equation with non-linear perturbation driven by a space-time
fractional noise. Different regimes are observed, depending on the global
pathwise roughness of the noise. To this end, and following the procedure
exhibited in \cite{hai-14}, the equation is first "lifted" into some abstract
"regularity structure" and therein solved through a fixed-point argument. Then
we construct a consistent "model" above the fractional noise, by relying on a
smooth Fourier-type approximation of the process.Comment: Accepted versio
Rough Volterra equations 1: the algebraic integration setting
We define and solve Volterra equations driven by an irregular signal, by
means of a variant of the rough path theory called algebraic integration. In
the Young case, that is for a driving signal with H\"older exponent greater
than 1/2, we obtain a global solution, and are able to handle the case of a
singular Volterra coefficient. In case of a driving signal with H\"older
exponent in (1/3,1/2], we get a local existence and uniqueness theorem. The
results are easily applied to the fractional Brownian motion with Hurst
coefficient H>1/3.Comment: 31 page
Biosynthesized silver nanoparticles to control fungal infections in indoor environments
Fungi grow especially in dark and moist areas, deteriorating the indoor environment and causing infections that particularly affect immunosuppressed individuals. Antimicrobial coatings have as principal objective to prevent biofilm formation and infections by incorporation of bioactive additives. In this sense, metallic nanoparticles, such as silver, have proven to be active against different microorganisms specially bacteria. Biosynthesized method is a promising environmentally friendly option to obtain nanoparticles. The aim of this research was assess the employment of plants extracts of Aloysia triphylla (cedrón), Laurelia sempervirens (laurel) and Ruta chalepensis (ruda) to obtain silver nanoparticles to be used as an antimicrobial additive to a waterborne coating formulation. The products obtained were assessed against fungal isolates from biodeteriorated indoor coatings. The fungi were identified by conventional and molecular techniques as Chaetomium globosum and Alternaria alternate. The results revealed that the coating with silver nanoparticles obtained with L. sempervirens extract at 60°C with a size of 9.8 nm was the most efficient against fungal biofilm development.Fil: Deya, Marta Cecilia. Provincia de Buenos Aires. Gobernación. Comisión de Investigaciones CientÃficas. Centro de Investigaciones en TecnologÃa de Pinturas. Consejo Nacional de Investigaciones CientÃficas y Técnicas. Centro CientÃfico Tecnológico Conicet - La Plata. Centro de Investigaciones en TecnologÃa de Pinturas; ArgentinaFil: Bellotti, Natalia. Provincia de Buenos Aires. Gobernación. Comisión de Investigaciones CientÃficas. Centro de Investigaciones en TecnologÃa de Pinturas. Consejo Nacional de Investigaciones CientÃficas y Técnicas. Centro CientÃfico Tecnológico Conicet - La Plata. Centro de Investigaciones en TecnologÃa de Pinturas; Argentin
Non-linear Rough Heat Equations
This article is devoted to define and solve an evolution equation of the form
, where stands for the Laplace operator
on a space of the form , and is a finite dimensional
noisy nonlinearity whose typical form is given by , where each is a
-H\"older function generating a rough path and each is a smooth
enough function defined on . The generalization of the usual
rough path theory allowing to cope with such kind of systems is carefully
constructed.Comment: 36 page
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