Eurodéputé: «Seconde chance» ou «Tremplin» – Comparaisons des trajectoires politiques de candidats PSE et PPE aux élections européennes de 2014 en France et en Suède. = MEP: "Second Chance" or "Jump" - comparisons of PSE candidates and political trajectories EPP in European elections 2014 in France and Sweden. Bruges Political Research Paper No. 40, February 2015

Le mandat d’eurodéputé est conçu différemment dans chaque état membre. Cet article teste la validité des cultures politiques inclusive et exclusive, créées pour l’analyse des sélections des candidats français et suédois et leur conception du mandat européen. Leur sélection demeure un monopole partisan national où l’adhésion à un parti et la professionnalisation politique priment. La distinction apparait dans le degré d’ouverture de la sélection et la conception de la fonction d’eurodéputé et du Parlement européen. Les conclusions valident l’approche créée, montrant un déplacement du curseur le long des continuums formés par les cultures inclusive et exclusive. La France, «exclusive», reste centrée sur Paris et des élections ayant des conséquences sur le pouvoir exécutif. La Suède est plus inclusive tant dans les profils des candidats que dans les processus qui les intègrent aux listes et dans la façon de concevoir le rôle des MEP et du Parlement européen. Cet article se fonde sur un mémoire de Master: E. Cazenave, Eurodéputé: «Seconde chance» ou «Tremplin»? Comparaison des trajectoires politiques de candidats PPE et PSE aux élections européennes de 2014 en France et en Suède, Bruges, Collège d’Europe, 2014

Hydraulic conductivity and experiments of sediment beds

In marine environments, sediments from different sources are stirred and dispersed, generating beds that are composed of mixed and layered sediments of differing grain sizes. Traditional engineering formulations used to predict erosion thresholds are however, generally for unimodal sediment distributions, and so may be inadequate for commonly occurring coastal sediments. We tested the transport behavior of deposited and mixed sediment beds consisting of a simplified two-grain fraction (silt (D50 = 55 µm) and sand (D50 = 300 µm)) in a laboratory-based annular flume with the objective of investigating the parameters controlling the stability of a sediment bed. To mimic recent deposition of particles following large storm events and the longer-term result of the incorporation of fines in coarse sediment, we designed two suites of experiments: (1) "the layering experiment": in which a sandy bed was covered by a thin layer of silt of varying thickness (0.2 - 3 mm; 0.5 - 3.7 wt %, dry weight in a layer 10 cm deep); and (2) "the mixing experiment" where the bed was composed of sand homogeneously mixed with small amounts of silt (0.07 - 0.7 wt %, dry weight). To initiate erosion and to detect a possible stabilizing effect in both settings, we increased the flow speeds in increments up to 0.30 m/s. Results showed that the sediment bed (or the underlying sand bed in the case of the layering experiment) stabilized with increasing silt composition. The increasing sediment stability was defined by a shift of the initial threshold conditions towards higher flow speeds, combined with, in the case of the mixed bed, decreasing erosion rates. Our results show that even extremely low concentrations of silt play a stabilizing role (1.4% silt (wt %) on a layered sediment bed of 10 cm thickness). In the case of a mixed sediment bed, 0.18% silt (wt %, in a sample of 10 cm depth) stabilized the bed. Both cases show that the depositional history of the sediment fractions can change the erosion characteristics of the seabed. These observations are summarized in a conceptual model that suggests that, in addition to the effect on surface roughness, silt stabilizes the sand bed by pore-space plugging and reducing the inflow in the bed, and hence increases the bed stability. Measurements of hydraulic conductivity on similar bed assemblages qualitatively supported this conclusion by showing that silt could decrease the permeability by up to 22% in the case of a layered bed and by up to 70% in the case of a mixed bed.

Mike Lattany, UM track, 1980, high-jump

[1980 Central Collegiate Meet]