A água é um recurso estratégico para a mineração, principalmente no beneficiamento de minérios. Com isso, o melhor aproveitamento deste recurso, incluindo seu reuso, primordial dada sua escassez e restrições ambientais. No entanto, reuso da água, na flotação, pode reduzir eficiência, devido à presença íons nela dissolvidos. Neste sentido, visou-se obter uma qualidade através coag...

We report vibrational and electronic spectra of the hydroxy-methyl-peroxy radical (HOCH2OO(•) or HMP), which was formed as the primary product of the reaction of the hydroperoxy radical, HO2(•), and formaldehyde, HCHO. The ν1 vibrational (OH stretch) spectrum and the à ← X̃ electronic spectrum of HMP were detected by infrared cavity ringdown spectroscopy (IR-CRDS), and assignments were verified ...

The laser induced fluoresence excitation spectrum for the à A1 ↔ X̃ 2E transition of the methoxy radical has been reinvestigated. An extensive set of vibrational levels has been assigned with the aid of increased vibrational and rotational cooling. Many of these vibrational assignments are confirmed by rotational analysis of bands involving both the symmetric and asymmetric fundamentals of the Ã...

Consider the B-valued probability space (A, E,B), where A is a tracial von Neumann algebra. We extend the theory of operator valued free probability to the algebra of affiliated operators Ã. For a random variable X ∈ Ã we study the Cauchy transform GX and show that the von Neumann algebra (B ∪ {X}) ′′ can be recovered from this function. In the case where B is finite dimensional, we show that, ...

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Vibrationally resolved 355 and 266 nm anion photoelectron spectra of B2N are presented. Photodetachment to two electronic states of linear B–N–B is observed and, aided by electronic structure calculations, assigned to the X̃ Sg →X̃ Su11e and X̃ Sg→à Sg11e transitions. The electron affinity of B2N is 3.09860.005 eV and the à Sg 1 term energy T0 is 0.785 60.005 eV. Observation of excitations involvi...