Search results for "Dox"

Novel Phases in the V-P-O Catalytic System from Oxovanadium Hydrogenphosphate Precursors

1994

ABSTRACTSeveral biphasic VOP04/(VO)2P2O7 redox partners seem to be active in the catalytic cycles involved in the mild oxidation of simple hydrocarbons to maleic anhydride. The present X-ray time resolved thermal-diffractometric study reveals the existence of a new anhydrous variety of the oxidized form, ω-VOPO4, which may appear as an intermediate in the formation of the well known β-VOPO4. This new phase only remains well crystallized at relatively high temperatures, and when it is allowed to cool down in wet air VOPO4·2H2O results. In turn, another well defined phase, VOPO4·1.58H2O, can be recognized in the course of the hydration process.

Muere Vidal-Beneyto, un conspirador contra el franquismo

2010

Electrocatalytic Behavior of Tetrathiafulvalene (TTF) and Extended Tetrathiafulvalene (exTTF) [FeFe] Hydrogenase Mimics

2021

TTF- and exTTF-containing [(μ-S2)Fe2(CO)6] complexes have been prepared by the photochemical reaction of TTF or exTTF and [(μ-S2)Fe2(CO)6]. These complexes are able to interact with PAHs. In the absence of air and in acid media an electrocatalytic dihydrogen evolution reaction (HER) occurs, similarly to analogous [(μ-S2)Fe2(CO)6] complexes. However, in the presence of air, the TTF and exTTF organic moieties strongly influence the electrochemistry of these systems. The reported data may be valuable in the design of [FeFe] hydrogenase mimics able to combine the HER properties of the [FeFe] cores with the unique TTF properties

De la historia a la histeria. 'Las teorías salvajes' de Pola Oloixarac

2016

Resumen Pola Oloixarac se presenta como paradigma de un nuevo escenario historico y epistemologico en la concepcion, escritura y lectura de la literatura argentina actual. Asi en en este articulo hacemos un recorrido de la "historia" a la "histeria" de su ficcion: desde el analisis de la historia reciente argentina, hasta la construccion y recepcion de la (auto)figuracion de la autora. Al mismo tiempo abordamos la pugna critica entre fuerzas de tasacion literaria que oscilan entre la promocion mercadotecnica y el aval de la doxa academica, y que tienen como eje central la imagen espectacularizada y la marca construida de y por Pola Oloixarac. Pola Oloixarac is presented as a paradigm of a n…

"Mais... je ne visite pas!". Une approche ethnographique de l'usage faible des œuvres

2013

Some photographic exhibitions are nowadays set outdoors in order to popularize art. Through a case study, this article examines the "weak use of images" as it is practised in public places, by passers-by who do not identify art pieces as such, and do not consider themselves as visitors. Their relation to art pieces, in this context, is built on an apparent paradox (they relate and at the same time do not relate to the pieces), and constitutes the minor mode of situations and observed interactions (this relation does not organise or structure the latter).

Paradoxes of Mentoring: An Ethnographic Study of a Mentoring Programme for Highly-educated Women with Migrant Backgrounds

2019

This article explores paradoxes that emerge in the mentoring of highly-educated, female, foreign-born job-seekers in Finland. Theoretically, the study is linked to the growing body of research scrutinising the integration or discrimination of migrants in working life. It analyses cultural practices and ideas that are visible and affect the mentoring interaction. On a more practical level, the paper determines how the mentors and mentees experience the mentoring, and how intercultural mentoring could be improved in order to promote mentees’ employment. The article is based on ethnography and 11 semi-structured interviews. Two major paradoxes and their links to cultural meanings were identifi…

Artrepreneurs and the autonomy paradox

2022

In this article, we examine the views that young (under 35 years) freelancers and entrepreneurs who work as professional artists in Finland have of their work. We refer to them as artrepreneurs. Our data sample is composed of the responses of entrepreneurs and freelancers (n = 209) from a survey data on young artists (n = 565) collected in 2017. By using a set of quantitative methods we study the impact of different factors on the job satisfaction experienced by freelancers and entrepreneurs, the nature and motivation factors of their work, as well as their status and livelihood. In our interpretative framework, central concepts are the “hybridity” and “precarity” of artists’ work and “auto…

Thermal frontal polymerization with a thermally released redox catalyst

2012

ABSTRACT: We studied thermal frontal polymerization using a re-dox systeminan attempt to lower the temperature of thefrontallypolymerizable system while increasing the front velocity so as toobtain a self-sustaining front in a thinner layer than without theredox components. A cobalt-containing polymer with a meltingpoint of 63 C (Intelimer 6050X11) and cumene hydroperoxidewere used with a triacrylate. The use of the Intelimer decreasedthe front velocity but allowed fronts to propagate in thinner layersand with more filler while still having a pot life of days. Nonplanarmodes of propagation occurred. Fronts propagated faster when6-O-palmitoyl- L -ascorbic acid was used as a reductant. Intere…

Model for Solid State Voltammetry of Zeolite-Associated Species

2004

The electrochemical reduction/oxidation of zeolite-associated species is described from the model of Lovric and Scholz for redox conductive microcrystals and the model of Andrieux and Saveant for redox polymers. It is assumed that the reaction starts at the three-phase boundary between electrode, zeolite particle, and electrolyte. From this point, the reaction zone grows while electrons and charge-balancing cations diffuse perpendicularly along the zeolite. As a result, at short times, a Cottrell-type behavior, controlled by the diffusion of electrolyte countercations in the zeolite can be expected. At larger times, a thin-layer response in which electron hopping between adjacent redox site…

Cytochrome F as Indicator for the Interaction of the Two Photosystems in the State 1 and State 2

1990

The transition of plants into a State 1 or a State 2 by an excess of PS I or PS II excitation was described by BONAVENTURA and MYERS [1]. Since the time of their investigations fluorometric methods gained increasing importance in analyzing the distribution of energy between the two photosystems [21. It was possible to correlate the altered energy balance to the phosphorylation of LHCII and it’s migration into non-appressed thylakoid membranes [31. However fluorescence measurements can give only indirect evidences that also changes in the activity of the two photosystems are produced by the changed energy distribution. A direct assessment of the photochemical variations during state transiti…