Experimental characterization of the constitutive materials composing an old masonry vaulted tunnel of the Paris subway system

A significant proportion of the Paris metro tunnels comprise a masonry vault built out of stone blocks and mortar joints, and sidewalls and slabs made of unreinforced concrete. In order to provide the necessary data for future structural evaluation, an extensive laboratory testing programme has been conducted to characterize the materials of the tunnel separately, i.e., mortar, stone, and concrete. The tests, carried out on specimens taken from cores extracted from a 1930s tunnel, enabled to determine the mechanical properties, including direct tensile, shear strength, and mode I fracture energy, as well as the properties of the stone-mortar interface. Results show that the masonry mortar joints could reach 10 cm in width, and that blocks of stone varied in composition and porosity, thus producing a wide range of mechanical properties. The concrete was composed of large-sized aggregates and showed low stiffness and strength. Based on these experimental results, ratios between mechanical characteristics are hereby proposed. Perspectives on the use of this experimental data in a finite element model are then discussed.     

Universalism within: The tension between universalism and community in progressive ideology

Social-democratic parties face a dilemma between the universalist ethos of their socialist tradition and the nationalism that they share with the other political actors of the state where they act. In this paper, we examine comparatively the position of the Spanish party Partido Socialista Obrero Español (PSOE) and the Catalan party Esquerra Republicana de Catalunya (ERC) on three political debates that pertains to the link between welfare and identity in Spain. We show how these parties experience opposite tensions between nationalism and the universalism of their left-wing ideology. Whereas ERC calls for a withdrawal from the Spanish system of social security, the PSOE advocates imposing on Catalonia a symmetric form of solidarity with the rest of Spain, despite recognising the region's different identity. Above all, both parties take identity for granted as a pre-political factor that ‘naturally’ justifies differential treatment, according to ERC, or equalising federalism, in the case of the PSOE.     

Holocene land-use evolution and associated soil erosion in the French Prealps inferred from Lake Paladru sediments and archaeological evidences

A source-to-sink multi-proxy approach has been performed within Lake Paladru (492 m a.s.l., French Prealps) catchment and a 6-m long sediment sequence retrieved from the central lacustrine basin. The combination of minerogenic signal, specific organic markers of autochthonous and allochthonous supply and archaeological data allows the reconstruction of a continuous record of past human disturbances. Over the last 10,000 years, the lacustrine sedimentation was dominated by autochthonous carbonates and the watershed was mostly forest-covered. However, seven phases of higher accumulation rate, soil erosion, algal productivity and landscape disturbances have been identified and dated from 8400 to 7900, 6000 to 4800, 4500 to 3200, 2700 to 2050 cal BP as well as AD 350–850, AD 1250–1850 and after AD 1970. Before 5200 cal BP, soil erosion is interpreted as resulting from climatic deterioration phases towards cooler and wetter conditions. During the Mid-Late Holocene period, erosion fluxes and landscape disturbances are always associated with prehistorical and historical human activities and amplified by climatic oscillations. Such changes in human land-used led to increasing minerogenic supply and nutrients loading that affected lacustrine trophic levels, especially during the last 1600 years. In addition, organic and molecular markers document previously unknown human settlements around Lake Paladru during the Bronze and the Iron Ages.     

Fish Processing in Italy and Sicily During Antiquity

The aim of this paper is to present a short overview of the production and trade in marine resources in Italy and Sicily during Antiquity. As the results of this research have already been published in detail elsewhere, the aim of this short contribution is to summarise the most important data and to highlight some of the research questions that remain unsolved. The paper follows a chronological order, from the pre-Roman period to the 2nd century AD, as well as a geographical one, starting with Sicily, moving on to Magna Grecia in what is now southern Italy and then moving on to the rest of Italy. A major consideration, highlighted here, is that in many cases we are dealing with data from old excavations and precise archaeological information is rarely available.     

Multi-method (TL and OSL), multi-material (quartz and flint) dating of the Mousterian site of Roc de Marsal (Dordogne,France): correlating Neanderthal occupations with the climatic variability of MIS 5–3

Roc de Marsal has yielded numerous remains of Mousterian occupations, including lithics, fauna and combustion features. It was made famous by the discovery of the skeleton of a Neanderthal child. Given the need to date the sequence, TL and OSL were applied on heated flints and quartz, and OSL on unheated quartz. Chronological results combined with palaeoenvironmental data – faunal remains and micromorphological features in the sediments from the cave, pollen proxies and faunal remains from the region – allowed us to place climate variations in southwest France on a numerical time scale. Denticulate Mousterian occupations were dated to the middle of MIS 4 (65–70 ka) and Quina layers either to the very end of MIS 4 or to MIS 3. Interestingly, a faunal pattern showing a mix of red deer, roe deer and reindeer was found to have occurred during MIS 4, which was shown to be consistent with data from other similar sites in southwest France.