A Ground Motion Record Selection Approach Based on Multiobjective Optimization

The evaluation of the seismic safety and reliability of buildings and building contents within a probabilistic framework often requires response history analyses using site-specific ground motion records. The ground motion selection method proposed in this paper addresses this issue by a stochastic search procedure in which record sets are selected such that first- and second-order statistics (median and dispersion) satisfy predefined ground motion spectrum targets over a wide period range. Once a ground motion record set is selected, it can be used for seismic assessment of a broad class of buildings within the target period range at the given location.     

Ria de Aveiro A: a shipwreck from Portugal dating to the mid-15th century; a preliminary report

The remains of a coasting vessel were found in a lagoon close to the coast. Four radiocarbon determinations provided a date in the mid-15th century and it has been the subject of several seasons of excavation of CNANS. The excavation strategy is described, as are its surviving constructional details which are analysed with reference to early sources for Portuguese naval architecture. This coaster has constructional features found in ocean-going ships of the Iberian-Atlantic tradition. Its cargo of pottery is one of the most extensive and closely dated from the Age of Discovery and includes 18 forms.     

Surviving in the margins of a genocide case in the making: recognizing the economy of testimony at stake in research on political violence

ABSTRACT

In this article, we aim to draw attention to the hopes, frustrations and disillusions that so-called ‘transitional justice’ projects produce in drastically poor, war-torn, historically marginalized but politicized Indigenous communities. Drawing on extensive ethnographic research we conducted separately between 1982 and 2010 in Guatemala and Mexico, we describe the ways in which the world came to know about Finca San Francisco’s massacre, committed by the Guatemalan army on 17 July 1982, as part of its scorched earth policy. We then look at the various forms of reparations its survivors have been the subject of. In so doing, we focus more specifically on how the Center for Human Rights Legal Action (CALDH), the non-governmental human rights organization that was behind the Ríos Montt genocide case, mobilized Finca San Francisco’s massacre survivors to become participants in the trial. After examining how the survivors of Finca San Francisco responded to CALDH’s mobilization efforts, we reflect on the kind of ‘gift’ these survivors expected in return for their stories of annihilation and destruction. Our goal is to bring to light the ‘economy of testimony’ that human rights activists, journalists or social scientists become entangled in once they ask genocide survivors to testify about the brutal deaths of their loved ones.     

Critical Assessment of Intensity Measures for Seismic Response of Italian RC Bridge Portfolios

The seismic assessment of a road network depends largely on the characterization of the fragility of its bridge components. The accuracy of bridge seismic demand estimates and the use of proper intensity measures (IM) will significantly influence such task. The available literature has mainly focused on buildings or a limited number of bridge configurations and IMs, which may not be representative for bridge portfolio assessment studies. In this paper, the correlation quality between a larger pool of traditional and innovative IMs and the nonlinear dynamic response of typical Italian RC bridges is investigated to identify the best-performing IMs.     

Liquefaction-Induced Lateral Load on Pile in a Medium Dr Sand Layer

One-g shake-table experiments are conducted to explore the response of single piles due to liquefaction-induced lateral soil flow. The piles are embedded in saturated Medium Relative Density (Dr) sand strata 1.7–5.0 m in thickness. Peak lateral pile displacements and bending moments are recorded and analyzed by uniform and triangular pressure distributions. On this basis, the observed levels of pile bending moment upon liquefaction suggest a hydrostatic lateral pressure approximately equal to that due to the total overburden stress. Using the experimental data, comparisons with current recommendations are made, and the Showa Bridge case history is briefly assessed.     

First dendroarchaeological dates of prehistoric contexts in South America: chullpas in the Central Andes

Despite the existence of long-lived tree species with excellent tree-ring characteristics, the use of dendrochronological techniques for dating archaeological contexts has been very limited in South America. Recent research in the Bolivian Altiplano of the Central Andes has yielded a network of Polylepis tarapacana chronologies that goes back to the 13th century. This species was regularly used by local populations since pre-Columbian times as raw material for beams, lintels, hooks and other architectural features in houses, storage chambers, and sepulchers. The aim of this study is to argue in favor of the potential of P. tarapacana for providing high resolution dates of significant archaeological events during the pre-Columbian era. The chronology of chullpas (burial towers and storage chambers) in the southern Andean Altiplano is used as a case study. Growth rings from P. tarapacana have provided several centennial-length dendrochronological records including a reference regional chronology covering the last 786 years in the Central Andean highlands. Based on this long reference chronology calendar years were assigned to woody pieces from pre-Hispanic chullpas. Dendroarchaeological results are consistent with contextual evidence and most radiocarbon dates from woody samples and related archaeological items. Our results indicate that P. tarapacana has a high potential for providing annually-resolved tree-ring dates for archaeological contexts in the Altiplano since the early 13th century.     

Assessment of the Lines of Torres Vedras defensive system with visibility analysis

A method to assess the coherence of defensive systems based on the individual and combined visual coverage of fortifications is presented. The case study is the complex fortification system of Lines of Torres Vedras, around Lisbon, Portugal, activated in the first decade of the 19th century to halt the French armies of Napoleon in the Peninsular War. As messages between fortifications are known to have been exchanged visually by semaphore, GIS-based viewshed calculations enabled the assessment of the system's coherence and the exploration of how the undocumented communication with the defensive forces' headquarters in Lisbon might have been achieved. Results show that the defensive system with its two lines was highly effective per se with respect to the visual coverage of the terrain and the exchange of messages between fortifications, but it could have been improved with minor changes to the location of communication devices. It is also found that communication with the headquarters in Lisbon was not adequate, suggesting that additional devices were needed.     

Macronutrient-based model for dietary carbon routing in bone collagen and bioapatite

Carbon stable isotope ratios (??¹³C), measured in human bone collagen (??¹³C_collagen) and bioapatite (??¹³C_bioapatite), are commonly used indicators in ancient human diet reconstruction. The underlying assumption is that human tissues broadly reflect the ??¹³C signal of dietary food sources (??¹³C_diet) plus an isotopic offset. However, interpretation of results may be confounded by the differentiated routing of macronutrients (energy, that is carbohydrates and lipids, and protein) having associated different isotopic signals (??¹³C_energy, ??¹³C_protein). Multiple regression analyses were conducted on data from controlled animal feeding experiments compiled by Froehle et al. (J Archaeol Sci 37:2662?C2670, 2010). We derived a simple algebraic macronutrient-based model with ??¹³C_bioapatite?=?10.1?+???¹³C_diet (??) and ??¹³C_collagen?=?4.8?+?0.74 ??¹³C_protein?+?0.26 ??¹³C_energy (??). While the established relationship for ??¹³C_bioapatite is similar to previously known results, the model also suggests that ??¹³C_collagen signal contributions originate from surprisingly consistent proportions of protein and energy macronutrients. Given that feeding experiments explore extreme variations in the proportion of diet macronutrients, the applicability of the proposed model and its predictions were tested in a variety of well-known, wild animal and human, natural contexts. Possible biochemical mechanisms explaining these empirical results are discussed.     

Development Strategy of the MAS in Bolivia: Characterization and an Early Assessment

The aim of this article is to describe and evaluate the development strategy launched by the Movimiento al Socialismo (MAS) in Bolivia when it came to power in 2006. The origin of this strategy can be found in the desire to tackle the economic and political transformations caused by the structural adjustment programme launched in 1985. The main economic measures taken by MAS are analysed in the context of the new development plans implemented in Latin America. This allows us to focus on the results achieved in Bolivia in two areas of major importance in the MAS strategy: productive transformation and income distribution. It is argued that, despite the progress achieved, the government of Evo Morales has so far been unable to alter the primary export model and the associated distribution pattern that have characterized the Bolivian economy.