Reliability-based Strength Amplification Factors for Structures with Asymmetric Yielding

A reliability-based methodology to estimate strength amplification factors for structures with asymmetric yielding is proposed. The approach is based on structural demand hazard analyses. Nonlinear time-history analyses of tridimensional simplified systems are carried out. The effects of two orthogonal components of the seismic ground motions and soil-structure interaction, are considered. Results show that the expected ductility demand of systems with asymmetric yielding may be much higher than those of symmetric systems. A simplified mathematical expression (which is function of the ratio between the fundamental vibration period of the system and that of the soil, ductility demand, and level of asymmetric yielding) is proposed to estimate the amplification factors. The expression is applied successfully to a 9-story reinforced concrete building exhibiting asymmetric yielding produced by tilting.     

Contributions of a Heritage Values-based Approach to Rock Art Management. Lessons from the Maloti-Drakensberg World Heritage Site,South Africa

This paper is based on rock art sites of the Maloti-Drakensberg massif (South African part), where more than 600 decorated shelters have thus far been identified. Being both institutionalised heritage sites open to the public and living heritage sites associated with various social practices and utilizations, their preservation requires us to consider the complexity of the values attributed to them. Combining a multidisciplinary and empirical approach, our paper highlights the processes of hybridization between attributed values, which therefore do not adhere to a strict category approach. Being strongly linked to the contexts in which they are articulated, their identification is coupled with a consideration of the macrodynamics in which rock art sites are integrated, as well as an analysis of the links between these different contexts and the value systems identified. In conclusion, the operational dimensions of such a methodology is questioned and some initial possibilities for action are proposed.     

Building an Experimental Comparative Reference Collection for Lithic Micro-Residue Analysis Based on a Multi-Analytical Approach

Residue analysis applied to stone tools is a useful aid for better understanding their past function and, by extension, reconstructing early human behaviour. However, if the nature of residues found on the lithic tools is misinterpreted, so will be our understanding of their archaeological context. As a consequence, correctly identifying residues in the domain of lithic studies is of paramount importance. With this main goal in mind, we analysed different experimental materials likely to have been involved in daily tasks in the prehistoric context (e.g. bone, wood, meat). Microscopic analyses were then carried out using two (comparable) techniques: Optical Light Microscopy and Scanning Electron Microscopy. Also, energy dispersive X-rays spectroscopy (EDX or EDS) was applied to the experimental samples to determine their elemental composition. Advantages and disadvantages of both microscopic methods and their implications for correct residue identification are discussed. The distribution of residues on lithic surfaces is also considered. This study resulted in the construction of a data-set including both photographic material and EDX spectra for each residue analysed. The main result is that, compared to OLM scanning, SEM analyses highly improves the accuracy of residue identification.     

The Stone Tidal Fish Weirs of the Molène Archipelago,Iroise Sea,Brittany, Western France: a long‐term tradition with early megalithic origins

This reports on a project that combined evidence gleaned from aerial photographs, place‐names, interviews, topography, LIDAR data, and sonar bathymetry to locate stone tidal fish weirs in the Molène Archipelago. The results were verified by diver and pedestrian visual surveys. Models of Holocene sea‐level change allowed a group of possibly Late Mesolithic–Early Neolithic weirs to be recognized, with a second group broadly dated to the later Neolithic–Early Bronze Age. The construction of these long megalithic structures is compared to the funerary monuments for which the Molène Archipelago is well known, in terms of technique, cost, and societal organization.     

‘6 to 8 Slices Of Bread’

Swedish health information, conducted by the National Board of Health and Welfare in collaboration with private participants, expanded rapidly in the 1970s. This study examines a controversial bread campaign, which declared that the National Board, in collaboration with the private Bread Institute, wanted citizens to eat six to eight slices of bread every day. Why and how could such a seemingly unholy alliance come about? Contextualizing the collaborations with the industry, with a network governance approach, this article seeks the answers by investigating the organizational conditions behind the various campaigns. Different conflicting dilemmas influenced the campaigns and their outcomes. For example, the desire to maximize the disseminationof information, and at the same time controlling it, as well as the imbedded power dynamics between private and public sector. The result points to a shift from strong to weak interdependence between the government agency and collaborating parties, basically due to the agency’s diminishing campaign resources, which opened up for a stronger commercialization of the bread campaign.     

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.     

Living in an Egyptian Oasis: Reconstruction of the Holocene Archaeological Sequence in Kharga

Within the Egyptian Western Desert, the Kharga Oasis was a particularly favourable and highly frequented area during the Holocene thanks to a permanent ground water supply. The high concentration and accessibility of archaeological sites here allows the cultural and economic changes to be documented at a local scale, when northeastern Africa was experiencing strong climatic variations and the transition to a food production economy. An expansive program led by the Institut français d’archéologie orientale (IFAO) which included systematic survey, sampling collections, tests and stratigraphic excavations has dramatically increased the amount of data available concerning the prehistory of the Kharga Oasis. Typo-technological analyses focusing on the lithic industries, and other aspects of material culture, plus a series of ¹⁴C dates have led to the definition of four main successive cultural phases: Kharga A, B, C and D. This paper describes this proposal of a new archaeological sequence for human occupation in the Kharga Oasis and discusses its integration in the wider frame of Egypt and the Eastern Sahara.