Can Pickering emulsion formation aid the removal of creosote DNAPL from porous media?

The purpose of this investigation was to examine the proposition that creosote, emplaced in an initially water saturated porous system, can be removed from the system through Pickering emulsion formation. Pickering emulsions are dispersions of two immiscible fluids in which coalescence of the dispersed phase droplets is hindered by the presence of colloidal particles adsorbed at the interface between the two immiscible fluid phases. Particle trapping is strongly favoured when the wetting properties of the particles are intermediate between strong water wetting and strong oil wetting. In this investigation the necessary chemical conditions for the formation of physically stable creosote-in-water emulsions protected against coalescence by bentonite particles were examined. It was established that physically stable emulsions could be formed through the judicious addition of small amounts of sodium chloride and the surfactant cetyl-trimethylammonium bromide. The stability of the emulsions was initially established by visual inspection. However, experimental determinations of emulsion stability were also undertaken by use of oscillatory rheology. Measurements of the elastic and viscous responses to shear indicated that physically stable emulsions were obtained when the viscoelastic systems showed a predominantly elastic response to shearing. Once the conditions were established for the formation of physically stable emulsions a "proof-of-concept" chromatographic experiment was carried out which showed that creosote could be successfully removed from a saturated model porous system. (C) 2007 Elsevier Ltd. All rights reserved.

Self-regulated learning and social media – a ‘natural’ alliance? Evidence on students’ self-regulation of learning, social media use and student-teacher relationship

Article is available at: http://www.tandfonline.com/doi/full/10.1080/17439884.2015.1064953.

Mapa de las series de vegetación de las cuencas alta y media del río Curueño (León)

En el presente trabajo se lleva a cabo el estudio sinfitosociológico de las cuencas alta ymedia del río Curueño (León), en base a la toma de sininventarios de vegetación y se realiza la cartografía de las series presentes en dicho territorio.

The media on violence against women: the paradigm of thinness

This article attempts to show that the aesthetic pressure through the media, especially exerted on women, can be defined as gender violence; and the consequences of thinness paradigm of our society and obesity stigma that this entails have for their bio-psycho-social health.

Quel est le sens de l’équation "Le media est le message?

Il y a un malentendu en ce qui concerne l’expression « Le media est le message » de Marshall McLuhan, car l'on méprend le sens du mot anglais médium pour l’acception canadienne de média, comme dans l’expression mass media/médias de masse. Dans cet article, Mark Federman, nous apprend qu’un media est une extension de l’être humain et que le message est le changement que le media suscite dans notre environnement.

Quel est le sens de l’équation « Le media est le message ?

Il y a un malentendu en ce qui concerne l’expression « Le media est le message » de Marshall McLuhan, car l'on méprend le sens du mot anglais médium pour l’acception canadienne de média, comme dans l’expression mass media/médias de masse. Dans cet article, Mark Federman, nous apprend qu’un media est une extension de l’être humain et que le message est le changement que le media suscite dans notre environnement.