Pigments from the Middle Palaeolithic levels of Es-Skhul (Mount Carmel,Israel)

Discovery of pigments at Middle Palaeolithic sites is of interest in the context of the ongoing debate about the tempo and mode of the emergence of modern human behaviour. Here we analyse four previously undescribed fragments of pigmental material from Es-Skhul shelter, layer B, Israel, McCown excavations, identified at the Department of Palaeontology, Natural History Museum, London. One of them is still partially embedded in the hard breccia characteristic of this layer. Inspection of breccia fragments from layer B has led to the identification of small pieces of red and orange pigmental material still enclosed in large clasts, further corroborating the attribution of the larger pieces analysed in this study to layer B. The four objects are studied using optical microscopy, Scanning Electron Microscopy (SEM), Transmission Electron Microscopy (TEM), Energy Dispersive X-ray (EDX), X-ray micro-diffraction (μ-XRD), Particle-Induced X-Ray Emission Spectrometry (PIXE), and Proton-Induced Gamma-ray Emission (PIGE). The specimens display various hues of yellow, orange, red, and one of them presents a gradual variation of shade from yellow to dark orange. SEM/EDX analysis identifies two specimens (Skhul 1 and 2) as being composed of iron-rich calcium phosphate, the third (Skhul 3) of potassium-rich clay with titanium-rich iron oxide inclusions, and the fourth (Skhul 4) of pure iron oxide crystals. TEM/EDX and μ-XRD analysis demonstrate that three pieces (Skhul 1, 2 and 4) were heated to at least 300 °C, a process that has partially or completely dehydrated goethite into haematite and changed their pristine yellow colour into orange or red. Skhul 3 shows no sign of heating, suggesting that its haematite content has a geological origin. The different mineral composition of the pieces suggests that they must come from a variety of sources. This implies that the associated collection strategies included the selection of materials that differed not only with respect to colour but also with respect to other physical and chemical properties. Although no formal proof exists that these lumps of pigmental material were deliberately heated, results obtained are consistent with this explanation.     

What about effective access to cars in motorised households?

Most Canadian urban centres are facing difficulties with public transport systems. As car ownership has increased, urban areas have experienced a long‐term decrease in per capita ridership. At present, a significant proportion of riders in most cities is considered to be transit captives, which usually refers to carless individuals or members of carless households. But, what about members of motorised households without effective or real access to a car as, for instance, two‐income households with only one car? Do these ‘restricted car users’ constitute a significant, but somewhat hidden, segment of the transit market? The initial purpose of this paper was to learn more about individuals with restricted or no‐car access who live in car‐owning households: Who are they? Where do they live? Do their numbers fluctuate significantly throughout the day? More specifically, how has car access in motorised households changed in the past two decades? Sociospatial profiles of motorised household members with restricted car access are presented for 1981 and 1996. The second purpose was to analyse restricted car access in motorised households by using a multivariate model of car access for motorised households in the Québec metropolitan area. To achieve these objectives, we developed a logical typology of forms of ‘restricted car access’ based on a combination of variables, or resources, qualifying the degree of car access enjoyed by individuals at any given moment during the day: availability of a car, possession of a driver's licence and a driver at the disposal of other household members. This typology was then applied to the 1981 and 1996 origin–destination survey data obtained from the Québec Census Metropolitan Area.     

La genèse des concepts mathématiques

Counter to the standard viewpoint which tends to dismiss history and intersubjectivity when dealing with mathematical cognition, the article shows that taking them into account is the only way to overcome a certain number of aporias related to mathematical objectivity, especially psychologism and relativism. Resting upon the conceptual framework devised by Ernst Cassirer under the name «symbolic form», the article shows that the fictional and the scientific stance must be located along the same meaning continuum and that it is only the collective elaboration of individual representations which can account for cultural productions.     

The mortgage crisis and evictions in Barcelona: identifying the determinants of the spatial clustering of foreclosures

The article identifies the determinants of the uneven spatial distribution of housing accumulated by banks via foreclosures in the city of Barcelona. Working with a new data source, we geolocalised foreclosed housing and analysed its tendency to spatially cluster. Using the bivariate version of the Local Moran Indicator, we confirmed the spatial correlation between the concentration of foreclosed housing and indicators of the socio-economic vulnerability of the neighbourhoods containing it. We also applied an OLS model to identify and weight the determinants of this clustering at the neighbourhood level. Our findings revealed that the growth of unemployment, the concentration of (non-EU) immigrant population and a greater presence of residents with low levels of studies were the key variables that explain the uneven geography of foreclosures in Barcelona. The results obtained also allowed us to characterize the spatial distribution of the housing accumulated by the banks during the mortgage crisis. As a result of the massive wave of evictions, banks have emerged as large-scale property owners in Spain and key agents for present and future housing policies.