Práticas Organizacionais e Estrutura de Relações no Campo do Desenvolvimento Metropolitano

The aim of this study is to examine the relationships between the organizations responsible for urban planning in the towns of the Metropolitan Region of Curitiba, Brazil, and how these relationships influence urban development practices. In the article we establish a definition of organizational practices in accordance with social practices and, empirically, we enquire how the urbanism model of the capital city of Paraná State impacts on the towns in the region. The theoretical frame of reference is characterized by the institutional theory in its structurationist approach. When describing the research strategy, we outline the relationships between the organizations of the towns of the Metropolitan Region of Curitiba through a social network analysis. Meanwhile, the urban development practices were identified based on secondary data and statements by 62 public managers. The results show a low density in direct relationships between town halls, with the network becoming more dense when State Government departments are involved. Despite the low level of direct influence of Curitiba’s urbanism on the other towns of the metropolitan region, characteristics of domination, signification and legitimization reveal some isomorphic practices and the presence of Brazilian cultural factors influencing the way public organizations act

Petrology of spinel peridotite xenoliths from Santo Antão, Cape Verde Islands

Os xenólitos ultramáficos, existentes em lavas basálticas alcalinas/nefeliníticas da Ilha de Santo Antão (Cabo Verde), incluem uma série harzburgítica e uma série dunítica/wehrlítica; a série harzburgítica apresenta características texturais/mineralógicas complexas e é mais refractária (Fo = 90-92) do que a série dos dunitos/wehrlitos (Fo = 82-88). Os xenólitos duníticos e wehrlíticos são, essencialmente, acumulados de olivina e espinela, com clinopiroxena intercumulus. A química mineral e os dados geotermométricos sugerem que os xenólitos duníticos/wehrlíticos cristalizaram a ~ 1000 ºC a partir de magmas alcalinos e acumularam em câmaras magmáticas profundas, sob a ilha de Santo Antão. Os xenólitos harzburgíticos são constituidos por olivina + ortopiroxena + espinela ± clinopiroxena. De acordo com as relações texturais e mineralógicas, os xenólitos harzburgíticos foram divididos em 3 grupos: I - protogranular, II - protogranular metassomatizado e III - porfiroclástico. A evolução térmica complexa registada nestes xenólitos, os elevados valores de fO2 (?FNIQ = 0.7 1.9) e o desenvolvimento de abundantes inclusões fluidas ricas em CO2, são atribuídos à infiltração recente nos harzburgitos de melts, aprisionados/cristalizados no interior do manto; estas características e a natureza refractária da série harzburgítica, apoiam a interpretação de que estes xenólitos representam litosfera oceânica empobrecida, modificada pelo magmatismo associado à génese da Ilha de Santo Antão

Interannual sub-aerial beach variability along a sector of the Tróia- Sines embayed coast

The comprehension of sub-aerial beach variability of sandy beaches is essential to describe and predict his behaviour after extreme events (e.g. storms). Around the world coastline beach monitoring plans are established in order to characterize the main morphodynamic changes at different spatial and temporal scales. Within this scope, four field surveys (19th to 28th May 2009; 30th October to 10th November 2009, 21th to 30th May 2010 and 14l to 21 April 2011), using a new coastal survey system named INSHORE system(Differential Global Positioning System) [1], were conducted along the Tróia-Sines embayed beach (INSHORE project -PTDC/AMB/73169/2006). The interannual variability of the sub-aerial beach topography along the Tróia-Sines embayed coast for the first three field surveys were analysed considering the DEM (Digital Elevation Model) analysis regarding the: alongshore coastline configuration; subaerial beach width; beach profile configuration and volumetric changes. The results points to the definition of eight main coastline sectors very similar to the results previously described by [2]. Although a general north-south increasing beach width trend can be observed, [3] one of these main sectors, Sector 6, presents a significant variation of the beach width and beach profile configuration. This sector was selected to describe the morphodynamic pattern responsible for the sediment accommodation (beach width, and profile configuration) during the studied period. The subtraction between the three DEMs points to the importance of the beach width variation that describes the landward or seaward subaerial beach displacement. Although this might affect the beach width, this variable should not be taken as the unique one to describe the shoreline change. In fact, this parameter does not describe the beach variability regarding the profile configuration (e.g. berm width and sediment accommodation). According to our results the volumetric changes are strictly related to the beach width variation but the profile configuration has a particular role in the final budget analysis. The proxies that were used (+2m, +3.4m and +4,3m MSL elevation contours) and the relation between the beach width and subaerial beach volume, has given high correlation values. These results proved that not only the MHW (mean high water) used by others authors [4] can be defined as a proxy to describe the shoreline evolution, but also other morphodynamic meaningful contour elevations can give reliable results

Metalloids in origin and evolution of life

Metalloids in origin and evolution of life. Metalloids have characteristics between metals and non-metals which give them, in some cases, specific properties. At least two of this chemical elements, boron and silicon, are essential to a significant number of living organisms and since some years ago it has been observed that the same metalloids may be involved in the synthesis and stabilization of some molecules relevant to the origin of life

Petrology and Geochemistry of Recent Lavas from Santo Antão (Cape Verde Islands)

ABSTRACT: Santo Antão Island is the northernmost island of the Cape Verde Archipelago that is located in the Atlantic Ocean between 17º 13’N-14º 48’N and 22º 42’W-25º 22’W. The genesis of this Archipelago is explained by the activity of a hot-spot, which began 25 My ago. The main stratigraphic sequences of Santo Antão island (Silva et al., 1994; 2004) have been dated by Plesner et al. (2003) and comprise, from base to top, the “Complexo Eruptivo Antigo” (7.57 ± 0.56 My) the “Formação Conglomerático-Brechóide”, the “Formação Eruptiva Principal” (3.24 ± 0.89 to 0.22 ± 0.03 My) (which is overlain by a white phonolitic deposit pumice) and the “Formação Eruptiva do Tope de Coroa” (0.17 ± 0.02 My to 0.09 ± 0.03 My). The “Complexo Eruptivo Antigo” includes chiefly basaltic flows. The “Formação Conglomerático-Brechóide” is a sedimentary unit formed during an intensive erosion period and was followed by an important volcanic event, represented by the “Formação Eruptiva Principal”, comprising nephelinitic, phonolitic, tephritic and basanitic lava flows. The “Formação Eruptiva do Tope de Coroa”, the most recent unit of the island, was divided (Silva et al. 2004) into three sub-units (figure 1): “Sequência Antiga”, “Sequência Intermédia” and “Sequência Superior”. The “Sequência Antiga” is composed by phonolitic and nephelinitic flows and scorias, the “Sequência Intermédia” comprises basaltic flows and scorias and the “Sequência Superior” includes basaltic, phonolitic and nephelinitic flows and scorias. Santo Antão recent lavas are silica undersaturated (carrying abundant feldspathoids, particularly hauyne), alkaline and considerably evolved (Mg#=13-53 wt%, Ni=0-252 ppm, Cr=0-434 ppm). They display a strong enrichment in incompatible trace elements, suggesting that their primary magmas were produced by low degrees of partial melting, from a heterogeneous, metassomatized, source (including residual garnet and phlogopite), with a significant HIMU component.info:eu-repo/semantics/publishedVersio

A centennial catalogue of hydro-geomorphological events and their atmospheric forcing

The DISASTER database records 1969 unique hydro-geomorphologic cases (floods and landslides) that generated human damages in Portugal during a 150 year-period (1865–2015. The main purposes of this work are the following: to present a national disaster events catalogue; to analyse the atmospheric conditions and to discuss the role of rainfall as main driving force of the hydro-geomorphological disaster events. The main Circulation Weather Types (CWTs) and the presence of Atmospheric Rivers (ARs) of each day of the disaster events were classified using the 20CR dataset (1865–2014) and the NCEP/NCAR reanalysis (2015). These datasets were used to compute the daily cumulative precipitation and the long term climatological year accumulated precipitation 10th, 50th, 90th and 95th percentile spanning 1865–2015 and the accumulated rainfall conditions after and before each disaster event. In the central and northern Portugal Disaster events are mainly driven by southwest (SW), west (W), northwest (NW) and Cyclonic (C) Weather Types, whereas the CWTs with a southern and eastern component [east (E), southeast (SE) and south (S)] are the main drivers in the south part of the country. Cyclonic CWT is widely associated with convective systems that can generate flash floods and urban floods often responsible for fatalities and injured people. CWTs with a westerly component can be associated to prolonged wet periods that can induce flood events in the main rivers and landslides in the mountain areas. The methodology used to build this disaster event catalogue can be applicable to other study areas, namely the North Atlantic and the Mediterranean regions, where the flood and landslides extremes are related to the atmospheric circulation.info:eu-repo/semantics/publishedVersio

The Use of Oleaginous Yeasts and Microalgae Grown in Brewery Wastewater for Lipid Production and Nutrient Removal: A Review

ABSTRACT: Brewery wastewater has been proposed as an attractive low-cost substrate for microbial lipid production for oleaginous yeast and microalga with promising results. For each liter of beer produced, from 3 to 10 L of wastewater are generated which can be used as culture medium for autotrophic or heterotrophic metabolism. This strategy allows reducing the culture medium cost, as well as obtaining high lipid contents and other high value compounds which can make the process profitable. Additionally, the use of industrial effluents/wastes as substrates for microbial growth can be a strategy to treat them based on the circular economy rules. This review presents the different brewery wastewater treatment strategies using oleaginous yeast and microalga pure and mixed cultures for the concomitant wastewater treatment and lipids/carotenoids production so far reported, highlighting the benefits/disadvantages of such strategies and comparing their performance in terms of wastewater treatment, lipids and carotenoids production between pure and mixed cultures performance.info:eu-repo/semantics/publishedVersio

On the Performance of LDPC-Coded MIMO Schemes for Underwater Communications Using 5G-like Processing

UIDB/EEA/50008/2020This article studies the underwater acoustic (UWA) communications associated with multiple input–multiple output (MIMO), single carrier with frequency-domain equalization (SC-FDE), and with low-density parity-check (LDPC) codes. Low-complexity receivers such as equal gain combining (EGC), maximum ratio combining (MRC), and iterative block—decision feedback equalization (IB-DFE) are studied in the above-described scenarios. Furthermore, due to the low carrier frequencies utilized in UWA communications, the performance of the proposed MIMO scenarios is studied at different levels of channel correlation between antennas. This article shows that the combined schemes tend to achieve good performances while presenting low complexity, even in scenarios with channel correlation between antennas.publishersversionpublishe