Moving to a new housing pattern? New trends in housing supply and demand in times of changing. The Portuguese case

This article aims to explain the effects of the recent economic and financial crisis on housing conditions and the ability of Portuguese families to access housing. It also intends to discuss how the crisis is reconfiguring the housing patterns, in terms of access to housing and changes in public policies, questioning the predominant mode of access to housing based on homeownership. This article also discusses the role of social housing in the Portuguese housing system and the changes and challenges in this sector coming from the economic and financial constraints of families and the state. This article is structured in three parts. The first is an overview of the Portuguese housing system and social housing in particular, highlighting the conditions and reasons that led to a reduced social housing stock and to the predominance of homeownership. The second part discusses the impact of the crisis on families and the state, trying to demonstrate how the constraints on both are translated into (1) worsening housing conditions, (2) a diversification of groups struggling to access housing in the private market and (3) a reduction of affordable housing, pressing the social housing sector. Finally, the third part is a reflection on the changes that the crisis has had in the orientation of housing policies and their instruments, arguing that the patterns of the Portuguese housing system are changing with emphasis on the need to diversify the housing supply to increasingly diverse groups in housing need.info:eu-repo/semantics/publishedVersio

Comment on the Adiabatic Condition

The experimental observation of effects due to Berry's phase in quantum systems is certainly one of the most impressive demonstrations of the correctness of the superposition principle in quantum mechanics. Since Berry's original paper in 1984, the spin 1/2 coupled with rotating external magnetic field has been one of the most studied models where those phases appear. We also consider a special case of this soluble model. A detailed analysis of the coupled differential equations and comparison with exact results teach us why the usual procedure (of neglecting nondiagonal terms) is mathematically sound.Comment: 9 page

Bifurcation analysis of the twist-Freedericksz transition in a nematic liquid-crystal cell with pre-twist boundary conditions

Motivated by a recent investigation of Millar and McKay [Mol. Cryst. Liq. Cryst., 435, 277/[937]-286/[946] (2005)], we study the magnetic field twist-Fr´eedericksz transition for a nematic liquid crystal of positive diamagnetic anisotropy with strong anchoring and pre- twist boundary conditions. Despite the pre-twist, the system still possesses Z2 symmetry and a symmetry-breaking pitchfork bifurcation, which occurs at a critical magnetic-field strength that, as we prove, is above the threshold for the classical twist-Fr´eedericksz tran- sition (which has no pre-twist). It was observed numerically by Millar and McKay that this instability occurs precisely at the point at which the ground-state solution loses its monotonicity (with respect to the position coordinate across the cell gap). We explain this surprising observation using a rigorous phase-space analysis

Some structural and emergent trends in Social Housing in Portugal. Rethinking housing policies in times of crisis

First of all, this article intends to analyse some structural trends in social housing in Portugal, while relating it with its welfare state regime nature, namely its incipient and tardy character, one that is predominantly oriented towards sectors other than housing. Having other European countries as reference, with different welfare state regimes, we will then point substantive differences in dimension, weight, access forms and target public in this housing sector. Consequently, our main argument revolves around the consequences of a fragile public investment in this domain, which is further channelled in a disparate and bipolar way between a small public promotion of social housing and the incentive to homeownership. We chiefly discuss, as a consequence of this model, the narrowing profile of social housing publics, in a spatially (and temporally) concentrated rationale, gathering individuals with common vulnerability features, lacking the ability to engage in positive residential and social mobility paths. Secondly, we discuss how the current economic and financial crisis, along with profound sociodemographic and labour market changes, determines academics and policy-makers to rethink housing policies and the very role of the state. on the one hand, we are faced with the drastic reduction of state resources and its investment capacity; on the other hand, there is the emergence of new housing needs, as a result of the crisis and also due to more structural economic and social transformations. This context, not only in Portugal but also in Europe, jeopardises policies and housing systems as we now them so far, reintroducing the argument over access (and affordability) to housing by more heterogeneous groups than the common profile of social housing beneficiaries at the moment. We therefore question the role of the state, the rationale and articulation possibilities with other actors and sectors, the financing model and de variety of audiences for whom the right to housing is not yet (or not anymore) guaranteed.FCTinfo:eu-repo/semantics/publishedVersio

Improving the Knowledge on Seismogenic Sources in the Lower Tagus Valley for Seismic Hazard Purposes

The Lower Tagus Valley, that includes the metropolitan area of Lisbon, has been struck by several earthquakes which produced significant material damage and loss of lives. Their exact location remains unknown. Our goal is to shed some light into the seismogenic sources in the area using seismic reflection and geological data. In areas with no seismic coverage, potential-field data interpretation was carried out. Seismicity was overlaid to the potential seismogenic structures and high-resolution data was acquired in order to confirm which structures have been active into the Quaternary. Three major fault-zones affecting the Neogene were identified: V. F. Xira, Samora-Alcochete and Pinhal Novo. For the first fault, strong evidences suggest it is active. The other two fault-zones and other structures previously unknown can be correlated with several epicentres. Empirical relationships between maximum moment magnitude and fault area indicate that MW > 6.5 earthquakes can be expected for the larger structures

Natural variability of lotic Mediterranean ecosystems or wildfire perturbations: who will win?

This study evaluates the impacts of wildfires in lotic Mediterranean ecosystems. It was carried out at Monchique ridge after big wildfires occurred during 2002 and 2003. Deferential impacts were evaluated comparing historical results obtained before the wildfires (1999 and 2001), with the post fire ones (2006 and 2007). Physical and chemical parameters of the water, habitat morphology, diatoms, macrophytes, macroinvertebrates and fishes were evaluated at 10 collecting places, before and after wildfires. High recovering rates were observed to the vegetation, but it is still possible to found fire impacts over macrophytes and river morphology. Wildfires, contributed to canopy decrease and, consequently to the growth of plants that usually are controlled by shadow. As a result, vegetation biodiversity tend to increase. River banks tend also to be invaded by terrestrial plants. Higher post fires recover rates were observed to the more aquatic communities (diatoms, macroinvertebrates and fishes). For those communities, comparing spring situations before and after the fires no substantial differences were observed. Sometimes differences between consecutive years are even higher. So it can be concluded that magnitude of wildfire impacts is less than the natural inter-annual variability of Mediterranean rivers. Long-term effects of forest fires, resulting from large woody debries, were also detected by morphological alterations, like debries dams. Habitat diversity increase and impacts on aquatic communities are expected

A local landscape in transition between production and consumption: can new management arrangements preserve the local landscape character?

Around towns in the Alentejo region, the landscape is dominated by a characteristic agricultural small scale mosaic. These areas are central in the region landscape character, – even if the large scale latifundia landscape of the extensive silvo-pastoral systems is most commonly associated with the region. In the last two decades, these parcels became extremely attractive for new comers, who settle in the rural context as residents, week-end visitors, being often also lifestyle farmers. The paper presents a case-study landscape, in Montemor-o-Novo, a small town 100 km from Lisbon, highly subject to the pressure for consumption uses, by urban users. The study shows that the new owners, even if they have settled in the area due to the tranquility and social bindings of the rural, end up doing farming, with new or reshaped production objectives, markets and models, but at the same time maintaining the traditional farm systems. Thus, the landscape character is maintained, so far. Nevertheless, the role of these neo-rurals and lifestyle farmers is still an unseen role, both by the agriculture and the planning sectors. And thus the question is, whether the combination of actors and land management drivers will continue maintaining the landscape in the futur

Reflecting on collaborative research into the sustainability of Mediterranean agriculture: A case study using a systematization of experiences approach

This article describes how a research institute went about reviewing the relationship between its members and external research partners in engaging in collaborative research. A systematization of experiences (SE) process was implemented to enable such review and draw implications for the institute’s strategy regarding research into the sustainability of Mediterranean agriculture. The SE exercise included four workshops attended by selected researchers, one questionnaire survey targeting the institute’s research community, and three focus group discussions with external research partners. The rate of participation by researchers decreased during the process; however, those that followed through to the end of the SE exercise found it to be useful in clarifying both individual and institutional perspectives. Further, SE was seen as a vehicle for increasing the level of understanding between researchers and their willingness to engage in collaborative actions. However, the rapid pace of today’s academic world and the dominant mode of evaluating scientific performance were identified as hindering the conditions needed to allow the necessary space and time for reflection and collaborative efforts. Therefore, the results highlight the current tension between the production of scientific knowledge according to existing patterns and the development of socially meaningful research