FRAGMENTATION AND CLUSTERING IN VERTICALLY LINKED INDUSTRIES*

ABSTRACT This paper models the location of two vertically related firms in a low labor cost country and in a country with a large market. The upstream industry is more labor intensive than the downstream industry. We find that spatial fragmentation occurs for low values of the input‐output coefficient and intermediate values of the transport rate, particularly if the countries are very asymmetric in size. Otherwise, we obtain agglomeration either in the low cost country (when the transport rate is low) or in the large market (when the transport rate is high). Multiple agglomerated equilibria arise when the transport cost of the intermediate good is significant.     

“Eternal Sunshine of the Spotless Mind”: Archaeology and Construction of Memory of Military Repression in South America (1960–1980)

During the era of dictatorships in Latin America, opposition was controlled by different methods—such as exile, detention, and murder. Repressive devices were reinforced by means of limiting information to ordinary people. Written sources on clandestine repression are scarce and fragmentary. As a matter of fact, most documents on the subject were destroyed by military regimes in recent past. Therefore, archaeological analyses might help us to shed light on repressive mechanisms, recovering missing people’s history and remains.     

The Dynamics of Regional Disparities in Central and Eastern Europe during Transition

This paper examines the evolution of territorial imbalances in per capita income in the Central and Eastern Europe regions between 1990 and 2001. In order to overcome the limitations of conventional convergence analysis, we have combined a non-parametric approach that allows us to study the dynamics of the entire cross-section distribution, with a series of theoretical results and measures taken from the literature on personal income distribution. The results obtained show an overall reduction in regional inequality over the study period. This process has been compatible with the simultaneous presence of between-country convergence and within-country divergence. Likewise, we have observed a reduction in the development gap between the sample regions and Western Europe. In any event, the polarization of the distribution under consideration has decreased, while the registered level of intra-distribution mobility is relatively low. Furthermore, the analysis highlights the important role played in explaining the distribution dynamics by factors such as the national component, spatial location, productive structure, agglomeration economies and the percentage of gross domestic product devoted to investment.     

Characterization of timber masonry walls with dynamic tests

Timber-framed wall buildings are seen all over Europe, especially in seismic regions, given its adequacy to resist earthquakes. The “Pombalino” buildings, developed after the great 1755 earthquake that destroyed Lisbon, constitute one of the best examples of historic seismic-resistant structures based on timber-framed masonry walls. The research presented in this article aimed at experimentally evaluating the seismic behavior of the “Pombalino” buildings. The experimental program was based on extensive dynamic testing on sub-structures of typical “Frontal” walls (the timber masonry walls), carried out at the LNEC (the Portuguese National Laboratory of Civil Engineering) shaking table. The tests comprised (a) seismic tests, in which the seismic action was applied with increasing amplitude in one direction; and (b) dynamic identification tests, aiming at evaluating the dynamic properties of the sub-structures and their evolution with damage accumulation.     

Clusters and Industrial Districts: Where is the Literature Going? Identifying Emerging Sub-Fields of Research

The industrial district and cluster literature has generated an extraordinary quantity of articles, debates and topics for discussion, and encompasses one of the most vibrant lines of research in the field of economics, geography, management and related disciplines. The literature, however, is fairly fragmented. In this paper, “bibliometric” methods are used to analyse the cluster literature published between 1957 and 2014 in order to explore “prospective” research priorities through the method of “bibliographic coupling”. Beyond focusing on foundational works in the past, this approach shifts the focus away from the practice of analysing co-citations and seminal contributions to one of looking at current and emerging trends in the literature. Using the ISI Web of Knowledge (Web of Science) as a database, an examination of two samples of 3955 and 2419 articles is made. Results reveal the existence of sub-fields of inquiry that follow their own particular research agendas, which remain distinct yet interconnected to one another.     

Reaction to Fire of Existing Timber Elements Protected With Fire Retardant Treatments: Experimental Assessment

Fire safety is an important issue of building safety, especially when the building’s fire load contents enhance the risks of fire deflagration. When existing timber structures are involved, the most usual way to improve its reaction to fire is to treat wood with fire retardants. This study focuses on the surface protection of existing timber roof structures against fire, through the use of fire retardant (FR) treatments applied on site. An experimental investigation was carried out to study the effect of FR treatments on timber reaction to fire, with a special emphasis on timber members with biological deterioration and previously treated with preservative products. The behaviour and effectiveness of intumescent and non-intumescent treatments was also investigated. The study showed that the application of FR treatments improved the reaction to fire of timber, even in the presence of previous preservative treatments. However, the choice of the specific FR treatment should take into account the substrate conditions. In addition, test results suggest that protection systems involving multi layers (intumescent and non-intumescent) with different functioning modes each are likely to have a good global performance on the protection of timber elements against fire.