Magnetic properties of GaMnAs single layers and GaInMnAs superlattices investigated at low temperature and high magnetic field

Magnetotransport properties of GaMnAs single layers and InGaMnAs/InGaAs superlattice structures were investigated at temperatures from 4 K to 300 K and magnetic fields up to 23 T to study the influence of carriers confinement through different structures. Both single layers and superlattice structures show paramagnetic-to-ferromagnetic phase transition. In GaMnAs/InGaAs superlattice beside the Curie temperature (Tc ~ 40 K), a new phase transition is observed close to 13 K.Comment: 8 pages, 5 figures, Proceedings of the XXXII International School on the Physics of Semiconducting Compounds, Jaszowiec 2003, Polan

Post-growth annealing of GaMnAs under As capping - an alternative way to increase Tc

We demonstrate that in situ post-growth annealing of GaMnAs layers under As capping is adequate for achieving high Curie temperatures (Tc) in a similar way as ex situ annealing in air or in N2 atmosphere practiced earlier.Comment: 13 pages, 4 figure

La concòrdia civil algeriana a través de la premsa espanyola (El País i La Vanguardia)

Podeu consultar la versió en castellà a: http://hdl.handle.net/2445/68365Publicació que recull el fruit d’un projecte d’investigació que tenia com a objecte analitzar, a través de la premsa espanyola, la complexa situació de la dècada negra algeriana dels anys noranta (1992-1999) i també la polèmica qüestió de la Llei de la Concòrdia Civil i de la Reconciliació Nacional de la primera dècada del segle XXI (2000-2009). La investigació, duta a terme a la Universitat d’Orà, s’emmarca en el “Projecte Algèria Universitats”, una iniciativa conjunta de la Xarxa Vives d’Universitats (la xarxa que aplega les universitats dels territoris de llengua catalana) i la CRUO (la Conferència Regional d’Universitats de l’Oest (d’Algèria)

La concordia civil argelina a través de la prensa española (El País y La Vanguardia)

Podeu consultar la versió en català a: http://hdl.handle.net/2445/68364Publicación que recoge el fruto de un proyecto de investigación que tenía por objeto analizar, a través de la prensa española, la compleja situación de la década negra argelina de los años noventa (1992- 1999) y también la polémica cuestión de la Ley de la Concordia civil y de la Reconciliación Nacional de la primera década del siglo XXI (2000-2009). La investigación, llevada a cabo en la Universidad de Orán, se enmarca en el “Proyecto Argelia Universidades”, una iniciativa conjunta de la “Xarxa Vives d’Universitats” (la red que reúne las universidades de los territorios de lengua catalana) y la CRUO (la Conferencia Regional de Universidades del Oeste (de Argelia)

Structure and dynamics of a model glass: influence of long-range forces

We vary the amplitude of the long-range Coulomb forces within a classical potential describing a model silica glass and study the consequences on the structure and dynamics of the glass, via molecular dynamics simulations. This model allows us to follow the variation of specific features such as the First Sharp Diffraction Peak and the Boson Peak in a system going continuously from a fragile (no Coulomb forces) to a strong (with Coulomb forces) glass. In particular we show that the characteristic features of a strong glass (existence of medium range order, bell-shaped ring size distribution, sharp Boson peak) appear as soon as tetrahedral units are formed.Comment: 5 pages, 4 figures. To be published in J.Phys.: C

Phosphorylation does not prompt, nor prevent, the formation of α-synuclein toxic species in a rat model of Parkinson's disease

Phosphorylation is involved in numerous neurodegenerative diseases. In particular, alpha-synuclein is extensively phosphorylated in aggregates in patients suffering from synucleinopathies. However, the share of this modification in the events that lead to the conversion of alpha-synuclein to aggregated toxic species needed to be clarified. The rat model that we developed through rAAV2/6-mediated expression of alpha-synuclein demonstrates a correlation between neurodegeneration and formation of small filamentous alpha-synuclein aggregates. A mutation preventing phosphorylation (S129A) significantly increases alpha-synuclein toxicity and leads to enhanced formation of beta-sheet-rich, proteinase K-resistant aggregates, increased affinity for intracellular membranes, a disarrayed network of neurofilaments and enhanced alpha-synuclein nuclear localization. The expression of a mutation mimicking phosphorylation (S129D) does not lead to dopaminergic cell loss. Nevertheless, fewer but larger aggregates are formed, and signals of apoptosis are also activated in rats expressing the phosphorylation-mimicking form of alpha-synuclein. These observations strongly suggest that phosphorylation does not play an active role in the accumulation of cytotoxic pre-inclusion aggregates. Unexpectedly, the study also demonstrates that constitutive expression of phosphorylation-mimicking forms of alpha-synuclein does not protect from neurodegeneration. The role of phosphorylation at Serine 129 in the early phase of Parkinson's disease is examined, which brings new perspective to therapeutic approaches focusing on the modulation of kinases/phosphatases activity to control alpha-synuclein toxicit

Perspective and Perception: Terrorism Then and Now in Conrad, Chesterton, Hamid and Shamsie.

The aim of this thesis is to develop a perspectival and perceptional approach to terrorism through its literary representations. The understanding of terrorism is characterised by a unidirectional perspective that prevents inclusive and varied interpretation of the intricacies of terrorism. In the aim of achieving the intention of this study, four primary texts have been selected: The Secret Agent: Simple Tale (1907), The Man Who Was Thursday: A Nightmare (1908), The Reluctant Fundamentalist (2007) and Home Fire (2017). The textual analysis of the novels is based on different aspects of perspective and perception that include pictorial metaphors structured around disguise, deceit and the changing insights that these suggest, as a way of mirroring the existing multidimensional aspect of terrorism. Sound as in narrative points of view, being an element that contributes to the formation of perception, is another analytical apparatus that serves to uncover the multifaceted character of terrorism. The primary texts, although not covering the period of colonial and postcolonial period, pave the way for the wider purpose of this study. They cover both representations of anarchist and contemporary violence. They are geographically diverse, which permits the exploration of the influence of geopolitics on the perception of terrorism. Moreover, the research analyses the representation of the terrorist from different contexts in the aim of revealing the different perceptions that can be associated with the choice of terrorism. This research aims at exploring the literary representation of all voices existing within terrorism but are absent from the mainstream terrorism discourse and perspective. It creates a literary grey space outside the unidirectional formulation of terrorism, that paints the images, the sounds and silence within terrorism to mimic the kaleidoscope effect of perspectives and perceptions through Conrad, Chesterton, Hamid and Shamsie