Structural control on present-day topography of a basement massif: the Central and Eastern Anti-Atlas (Morocco)

The Anti-Atlas basement massif extends South of the High Atlas, and, despite a very mild Cenozoic deformation, its altitude exceeds 1500m in large areas, reaching 3305m in Jbel Sirwa. Structural contours of the present elevation of a polygenic planation surface (the High Erosional surface) and of the base of Cretaceous and Neogene inliers have been performed to characterize the major tectonic structures. Gentle Cenozoic WSW-ENE- and N-Strending folds, of 60 to100km wavelength, reactivate Variscan structures, being the major contributors to the local topography of the Anti-Atlas. Reactivated thrusts of decakilometric to kilometric-scale and E-W trend involving the Neogene rocks exhibit a steep attitude and a small displacement, but they also produce a marked topographic expression. The resulting Cenozoic horizontal shortening along N-S sections across the Anti-Atlas is about 1%. The position of the major anticlinal hinges determines the location of the fluvial divides of the Warzazat basin and the Anti-Atlas, and a structural depression on one of these hinges (Jbel Saghro anticline) allowed the formerly endorheic Warzazat basin to drain southwards. The first Cenozoic structures generating local topography are of pre-mid Miocene age (postdated by 6.7Ma volcanic rocks at the Jbel Saghro), whereas the youngest thrust movements postdate the Pliocene sedimentary and volcanic rocks (involving 2.1Ma volcanic rocks at Jbel Sirwa). In addition to these features, the mean elevation of the Anti-Atlas at the regional scale is also the result of a mantle thermal anomaly reported in previous works for the entire Atlas system.

Co-movements between US and UK stock prices: the roles of macroeconomic information and time-series varying conditional correlations

This paper provides evidence on the sources of co-movement in monthly US and UK stock price movements by investigating the role of macroeconomic and financial variables in a bivariate system with time-varying conditional correlations. Crosscountry communality in response is uncovered, with changes in the US Federal Funds rate, UK bond yields and oil prices having similar negative effects in both markets. Other variables also play a role, especially for the UK market. These effects do not, however, explain the marked increase in cross-market correlations observed from around 2000, which we attribute to time variation in the correlations of shocks to these markets. A regime-switching smooth transition model captures this time variation well and shows the correlations increase dramatically around 1999-2000. JEL classifications: C32, C51, G15 Keywords: international stock returns, DCC-GARCH model, smooth transition conditional correlation GARCH model, model evaluation.

The Commons and anti-commons problems in the tourism economy

Countries specialised in tourism tend to face two problems with contradictory effects: the commons and the anti-commons, which lead to tourism over- and under-production, respectively. This paper develops a two-period model to analyse the joint effects of both problems on a small and remote tourism economy. Congestion and the complementariness between foreign transport and local tourism services are key features in this type of markets. As a result, direct selling and the presence of foreign tour-operators emerge as possible market arrangements with different implications in terms of welfare and public intervention. Four main results are obtained. First, in the direct selling situation the optimal policy depends on the relative importance of the problems. Second, the existence of tour-operators always leads to tourism over-production. Third, the presence of a single tour-operator does not solve the congestion problem. Lastly, the switch from several tour-operators to a single one is welfare reducing.

Dispositius nanoplasmònics basats en polaritons anti-simètrics per apliacacions biosensores i nanofotòniques

Presentem un estudi teòric comparatiu de les sensibilitats en volum dels sensors d’índex de refracció basats en polaritó de plasmó superficial (SPP) i en ressonància localitzada de plasmó superficial (LSPR). Els resultats demostren que el sensor SPP, àmpliament conegut i comercialitzat, ofereix una major sensibilitat en volum comparada amb la del sensor LSPR, estant aquest últim basat en l’ús de nanorods d’or. A més, la figura de mèrit del sensor LSPR, emprada per a analitzar la seva capacitat sensora, exhibeix una regió sensora òptima quan la longitud d’ona de ressonància es troba propera a 700 nm.

Approximation algorithms for two-state anti-ferromagnetic spin systems on bounded degree graphs

In a seminal paper [10], Weitz gave a deterministic fully polynomial approximation scheme for counting exponentially weighted independent sets (which is the same as approximating the partition function of the hard-core model from statistical physics) in graphs of degree at most d, up to the critical activity for the uniqueness of the Gibbs measure on the innite d-regular tree. ore recently Sly [8] (see also [1]) showed that this is optimal in the sense that if here is an FPRAS for the hard-core partition function on graphs of maximum egree d for activities larger than the critical activity on the innite d-regular ree then NP = RP. In this paper we extend Weitz's approach to derive a deterministic fully polynomial approximation scheme for the partition function of general two-state anti-ferromagnetic spin systems on graphs of maximum degree d, up to the corresponding critical point on the d-regular tree. The main ingredient of our result is a proof that for two-state anti-ferromagnetic spin systems on the d-regular tree, weak spatial mixing implies strong spatial mixing. his in turn uses a message-decay argument which extends a similar approach proposed recently for the hard-core model by Restrepo et al [7] to the case of general two-state anti-ferromagnetic spin systems.

Impacto de la utilización de hígados de donantes anti-HBc positivo en pacientes trasplantados por hepatitis B

El nostre objectiu és avaluar l’impacte de la utilització de fetges de donants anti-HBc positius en pacients trasplantats per hepatitis B, els quals van ser revisats de manera retrospectiva. La probabilitat acumulada d’hepatitis B post-trasplantament al 1er, 5é i 10é any va ésser del 3,7%, 8,3% i 8,3% en els receptors d’un empelt anti-HBc+ en comparació amb el 2,7%, 9,8% i 9,8% en els que varen rebre un empelt anti-HBc- (p=0,99). La probabilitat de supervivència al 1er, 5é i 10é any dels receptors d’un òrgan anti-HBc+ va ésser del 87%, 82% i 58% front al 87%, 82% i 74% en els que varen rebre un anti-HBc- (p=0,73). La utilització de donants anti-HBc positius no afecta ni a la supervivència ni al desenvolupament de hepatitis B en pacients trasplantats per VHB.

Translating and analysing songs: three songs in the context of communist Romania

Songs were the means used by the Romanian Communist Party to ‘educate’ Romanians. Through them, Romanians were told what they had to appreciate, how grateful they were supposed to be to the regime, how great President Ceausescu was and how they had to work harder and harder so that they could be even better Communists. This paper comprises the translation of three songs composed, performed and broadcast in Communist Romania and their analysis from the point of view of communication. In translating the song, I have chosen to translate closest to the original possible meaning and meanwhile to respect to the best of my ability Low’s ‘pentathlon principle’: singability, rhyme, rhythm, naturalness and fidelity to the sense of the source text

Asociación del anticuerpo anti-C1q con las manifestaciones clínicas, hematológicas e inmunológicas en el Lupus Eritematoso Sistémico: Estudio observacional retrospectivo de 135 casos.

: Las concentraciones de anticuerpo anti-C1q están elevadas en los pacientes afectados de LES. Según algunos estudios la presencia de este anticuerpo está asociada a la nefropatía lúpica, sin embargo en otros estudios esta relación no se comprobó. En nuestro trabajo relacionamos la positividad del anticuerpo anti-C1q con las manifestaciones clínicas, hematológicas e inmunológicas de la enfermedad. A diferencia de estudios previos sólo pudimos establecer una relación estadísticamente significativa con la vasculitis (p&0.001), la presencia de anti-DNAds (p 0.034), de anti-Sm (p 0.045) y el consumo de C3 (p 0.006). Se observó que los pacientes anti-C1q positivos desarrollan la enfermedad a edades más tempranas que los pacientes anti-C1q negativos. (p &0.005).

Los anticuerpos antinucleares en la artritis reumatoide: ¿factores predictores de ineficacia del tratamiento con anti-tnf?

L’objectiu va ser determinar si la presència de anticossos antinuclears en pacients amb artritis reumatoide (AR) condiciona una pitjor desposta al tractament amb anti-TNF. Es tracta d’un estudi tipus cohorte retrospectiu. Es van incloure 66 malalts amb crtieris ACR per AR que anaven a iniciar tractament amb anti-TNF i tenien una determinación basal de ANA. D’aquests 37 eren ANA positius i 29 ANA negatius. Es va observar una tendencia als 6 mesos de tractament entre els ANA positius a no presentar resposta (19% en els ANA positius enfront a 11% dels ANA negatius), sense poder establir diferencies estadísticamente significatives (p=0,081).

Presencia de anti-SLA en una población en tratamiento con estatinas

Hipòtesis: la presencia d’auto anticossos contra selenoproteïnes (anti-SLA) podria afavorir la lesió muscular en pacients en tractament amb estatines. S’han avaluat 26 pacients sense tractament previ amb estatines, realitzant-se una analítica bassal, als 3 i als 6 mesos. No s’han observat anticossos anti-SLA en cap, augment estadísticament significatiu del títol d’ANAs als 3 (test de Wilcoxon, p=1.00) ni las 6 mesos (prova de Friedman, p=0.657), augment estadísticament significatiu dels nivells de CK als 3 (test de “t”, p=0.285) ni als 6 mesos (test de “t”, p=0.298), ni símptomes de miopatia al llarg del seguiment.