11,127 research outputs found

    Five-Dimensional f(R) Braneworld Models

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    After incorporating the f(R) gravity into the general braneworld sum rules scope, it is shown that some particular class of warped five dimensional nonlinear braneworld models, which may be interesting for the hierarchy problem solution, still require a negative tension brane. For other classes of warp factors (suitable and not suitable for approaching the hierarchy problem) it is not necessary any negative brane tension in the compactification scheme. In this vein, it is argued that in the bulk f(R) gravity context, some types of warp factors may be useful for approaching the hierarchy problem and for evading the necessity of a negative brane tension in the compactification scheme.Comment: 10 pages, references updated, small modifications. Accepted for publication in Phys. Rev.

    The role of financial status, attitudes, behaviours and knowledge for overall well-being in Portugal: The mediating role of financial well-being

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    Purpose Although overall well-being is a well-studied phenomenon, financial well-being only recently has attracted scholars’ attention. Accordingly, this study aimed to understand the relationship between financial well-being, its predictors (financial status, financial behaviour, financial knowledge and financial attitudes) and overall well-being. Design/methodology/approach The authors collected data from 262 working adults. Findings The results showed that only financial status was positively related to financial well-being and the latter was positively related to overall well-being. It was also found that financial well-being mediated the relationship between financial status and overall well-being. In sum, these results showed a multidisciplinary concept of overall well-being and that individuals tend to prioritize financial security over the other components. Research limitations/implications The cross-sectional nature of the data is a limitation. Practical implications Practically speaking, this research is relevant because it highlights the evidence of financial status as an important influence on financial well-being, as well as the role of household income in individuals’ financial satisfaction. Originality/value The study addresses a call for research on the relationship between financial well-being, its main predictors and how these contribute to explain overall well-being.info:eu-repo/semantics/acceptedVersio

    Immunity of Foreign States in Brazilian Labor Courts

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    Shelf-Ocean material exchange influencing the Atlantic chemical composition off NW Iberian margin since the last glaciation

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    Rivers are the main conduit of sediment to the shelf. The basin geology, the drainage area and the discharge rate are the major factors that determine their sediment load (Milliman and Syvistski, 1992). Besides suspended particles, dissolved components may also give some information on the eroded crust. Sr isotopes in carbonate shells of biological organisms have been used to study, in the geological record, the influence exerted by the chemical weathering of the continental crust on the seawater composition (Macdougall, 1991). In this work, Sr isotope ratios obtained in tests of foraminifera representing the last 40 ka are presented and discussed in the scope of the palaeogeographical evolution of NW Iberia. This work aims to present and discuss the results of Sr isotope analyses (performed, by TIMS, in the Isotope Geology Laboratory of the University of Aveiro) of tests of two species of foraminifera, from nine samples taken along the OMEX core KC 024-19 (181 cm; 42°08’98’’N, 10°29´96’’W, and 2765m), collected in the Galicia Bank area, off Galicia. Taking into account that Sr contained in the carbonate tests is usually considered as preserving the signature of the contemporaneous seawater, one planktonic species (Globigerina bulloides) and one benthic species (Cibicides wuellerstorfi) were selected in order to try to detect Sr isotope variations both through time and between two different levels of the water column. The core age model, which records the last 40 ka, is based on a combination of oxygen isotope stratigraphy, eight AMS 14C datings and the synchronisation of the last four Heinrich Events in the Iberian Margin sedimentary records. As a whole, the obtained 87Sr/86Sr ratios vary between 0.709209 and 0.709108, with a mean 2σ error of 0.000025. These values lie within the range of modern marine Sr isotope ratios (0.70910-0.70922), as previously defined using analyses of both seawater and marine carbonates (see compilation by Faure and Mensing, 2005). Despite their small variation, the 87Sr/86Sr ratios obtained in G. bulloides seem to indicate that Sr dissolved in seawater at the KC 024-19 core site became slightly less radiogenic after the Last Glacial Maximum (LGM). This decrease is concomitant with diminishing amounts of the detrital components in the sediments (Fig. 1). Therefore, both the composition of dissolved Sr, as revealed by results on tests of planktonic foraminifera, and the proportions of suspended terrigenous particulate material arriving at the KC 024-19 site point to a decreasing importance of the contribution of the erosion of the Iberian Variscan crust since the Last Glacial Maximum and in the Holocene. The 87Sr/86Sr ratios measured in tests of benthic foraminifera (C. wuellerstorfi) are more erratic and no correlation can be established with palaeogeographical/palaeoclimatic constraints. The difference between the behaviour of Sr compositions in G. bulloides and C. wuellerstorfi may indicate that whilst the planktonic foraminifera should reproduce very closely the seawater composition, the benthic organisms should, in addition to the major role of seawater, also be affected by some sort of interaction with the sediments. As such, planktonic foraminifera are probably more reliable indicators of seawater composition in studies involving very small periods and corresponding very slight variations of the 87Sr/86Sr ratios. Taking into account that G. bulloides is a common planktonic species (living mostly in the first 50m of the water column), whose tests seem to be in equilibrium with sea water composition, variations in its 87Sr/86Sr ratios can be related with changes in the chemical composition of the water of the Atlantic Ocean off NW Iberian Margin. The highest 87Sr/86Sr values are contemporaneous with a period of low sea level (about -140 m; Dias et al., 2000) during the LGM. According to Dias et al. (2000) at 18 ka BP the shoreline was close to the shelf break. The summital parts of the Gerês and Estrela mountains were covered by local glaciers and close to the coast freezing occurred frequently. The river catchments, which extended far to the shelf, received more rainfall due to a longer, compared to present day conditions, wet season, which promoted both physical and chemical weathering. Higher pluviosity combined with the effect of spring ice melting maintained high river discharge and consequently caused very important sediment supply to the coastal zone. The extremely narrow shelf was a very energetic environment due to sea bottom inclination and very limited long wave refraction. Therefore, at that time, a long wet season and very competent rivers should have caused important erosion of the Variscan basement in NW Iberia. Additionally, then, the shoreline was much closer to the KC 024-19 site. The combination of all these factors favoured an important deposition of terrigenous sediments and the local slight enrichment in radiogenic Sr of the seawater. With sea level rise, after the deglaciation and during the Holocene, the river estuaries became progressively far away from the shelf break. Their competence of transport also became progressively reduced and the offshore transport of detrital sediments became progressively lower. Conversely the biogenic carbonate proportion in the sediments increased, due to lower dilution by the terrigenous particles. Simultaneously, the values of 87Sr/86Sr in the seawater at the KC 024-19 site became lower, as a consequence of a complete homogenization with the ocean global composition, which was now more effective with the increasing distance towards shoreline

    Desfile de Moda : potencialidades das actividades multidisciplinares

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    A realização de um Desfile de Moda é, tal como refere Dillon (2012) uma atividade que exige um esforço muito elevado da equipa que o produz e absorve muito tempo e comporta elevados custos. Se, por um lado, se trata de uma perfeita simbiose entre diversas áreas que trabalham, em conjunto, para um mesmo fim, por outro lado, exige a garantia de sucesso que advém da relação entre todas as partes intervenientes, o que só se consegue com um relacionamento eficaz na equipa. A complexidade que um Desfile pode implicar na sua organização, quando resulta numa atividade de grande sucesso, representa retorno e identifica-se com enormes potencialidades para todas as partes envolvidas, desde a entidade que o realiza (designer, marca, instituição ou outra) ao público que assiste e participa e absorve todo um vasto conjunto de sensações que lhe são proporcionadas em diversos níveis, visual, estético, audiovisual, multimédia, som/música, espaço, etc.info:eu-repo/semantics/publishedVersio
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