Objetiva esta pesquisa descrever e analisar as representacoes religiosas dos pentecostais do Asse... more Objetiva esta pesquisa descrever e analisar as representacoes religiosas dos pentecostais do Assentamento Herbert de Souza, localizado no municipio de Moreno, no Estado de Pernambuco. Percebemos no decorrer da investigacao que os assentados pentecostais, todos beneficiados pela acao do Movimento dos Trabalhadores Rurais Sem Terra (MST), atualizam suas representacoes religiosas de acordo com a demanda de vida que os motivou quando da entrada deles nas terras que pertenceram ao Engenho Pinto. Foi constatado tambem que o lugar e o tempo no qual aconteceu a insercao de cada pentecostal fez com que eles desenvolvessem elaboracoes religiosas diferenciadas acerca do Movimento, da terra e do que concebem como pratica religiosa. Assim eles tecem redes simbolicas de significado que dao ordem as suas concepcoes de mundo. Procuramos comparar as representacoes dos pentecostais que ja residiam nas terras do Engenho antes da ocupacao com as daqueles que vieram depois, ja como militantes do MST, ou...
para operações de crédito numa instituição financeira", realizado no ano lectivo de 2007/2008à Fa... more para operações de crédito numa instituição financeira", realizado no ano lectivo de 2007/2008à Faculdade de Ciências da Universidade de Lisboa para o efeito de arquivo e consulta nas suas bibliotecas e publicação do mesmo em formato electrónico na Internet. FCUL, 26 de Outubro de 2008 Marco Moita, supervisor do projecto de João Pereira, aluno da Faculdade de Ciências da Universidade de Lisboa, declara concordar com a divulgação do Relatório do Projecto em Engenharia Informática, intitulado "Implementação de funcionalidades numa solução de notação de risco para operações de crédito numa instituição financeira".
The experiences experienced by men in modernity transform literary narratives, thematically and f... more The experiences experienced by men in modernity transform literary narratives, thematically and formally, establishing the aim to use allegory as an explanatory stage of that new reality. In the book The Origin of German Tragic Drama, by Walter Benjamin, he conceives allegory as the revelation of a hidden truth that does not represent things just as they are, but provides a version of how they were or might have been. As a reflection of the principles implied in that reading, this paper takes Benjamin's allegory as an analytical category aiming at identifying the representation of violence in the short story A hora e a vez de Augusto Matraga (The Hour and Turn of Augusto Matraga), by Guimarães Rosa. Our analysis opens a dialogue with the dialectical perspective, in which social-historical conditioning factors contribute to understand Minas Gerais backlands, whose ethos supplies a perception of the world incorporated by Guimarães Rosas' poetics, widening the view of a violent and enchanting world.
Lecture Notes in Business Information Processing, 2008
The optimization capabilities of RDBMSs make them attractive for executing data transformations t... more The optimization capabilities of RDBMSs make them attractive for executing data transformations that support ETL, data cleaning and integration activities. Despite the fact that many useful data transformations can be expressed as relational queries, an important class of data transformations that produces several output tuples for a single input tuple are not adequately supported by RDBMSs. In this paper we address the issue of extending a RDBMS to include the mapper operator. In particular, we propose an SQL-like syntax together with several logical optimizations involving relational operators and the mapper. Finally, we experimentally compare the mapper operator with RDBMS implementations of one-to-many data transformations and validate the logical optimizations proposed.
Lymphocyte egress from the thymus and from peripheral lymphoid organs depends on sphingosine 1-ph... more Lymphocyte egress from the thymus and from peripheral lymphoid organs depends on sphingosine 1-phosphate (S1P) receptor-1 and is thought to occur in response to circulatory S1P. However, the existence of an S1P gradient between lymphoid organs and blood or lymph has not been established. To further define egress requirements, we addressed why treatment with the food colorant 2-acetyl-4-tetrahydroxybutylimidazole (THI) induces lymphopenia. We found that S1P abundance in lymphoid tissues of mice is normally low but increases more than 100-fold after THI treatment and that this treatment inhibits the S1P-degrading enzyme S1P lyase. We conclude that lymphocyte egress is mediated by S1P gradients that are established by S1P lyase activity and that the lyase may represent a novel immunosuppressant drug target.
We have previously reported that mouse plasmacytoid dendritic cells (DC) produce high levels of I... more We have previously reported that mouse plasmacytoid dendritic cells (DC) produce high levels of IL-12p70, whereas bone marrow-derived myeloid DC and splenic DC produce substantially lower levels of this cytokine when activated with the TLR-9 ligand CpG. We now show that in response to CpG stimulation, high levels of IL-10 are secreted by macrophages, intermediate levels by myeloid DC, but no detectable IL-10 is secreted by plasmacytoid DC. MyD88-dependent TLR signals (TLR4, 7, 9 ligation), Toll/IL-1 receptor domain-containing adaptor-dependent TLR signals (TLR3, 4 ligation) as well as non-TLR signals (CD40 ligation) induced macrophages and myeloid DC to produce IL-10 in addition to proinflammatory cytokines. IL-12p70 expression in response to CpG was suppressed by endogenous IL-10 in macrophages, in myeloid DC, and to an even greater extent in splenic CD8α− and CD8α+ DC. Although plasmacytoid DC did not produce IL-10 upon stimulation, addition of this cytokine exogenously suppressed...
The magnetic properties of a mixed spin-1 and spin-3/2 Ising ferromagnetic system on a cubic latt... more The magnetic properties of a mixed spin-1 and spin-3/2 Ising ferromagnetic system on a cubic lattice are studied by Monte Carlo simulation. In particular the effect of a single-ion anisotropy on the phase diagram is investigated. Some qualitative features of the phase diagram obtained by a cluster variational treatment of the same system are confirmed.
We assessed the differential advantages of deciduousness and evergreenness by examining 26 site‐y... more We assessed the differential advantages of deciduousness and evergreenness by examining 26 site‐years of carbon dioxide, water vapor, and energy flux measurements from five comparable oak woodlands in France, Italy, Portugal, and California (USA). On average, the evergreen and deciduous oak woodlands assimilated and respired similar amounts of carbon while using similar amounts of water. These results suggest that evergreen and deciduous woodlands have specific, and similar, ecological costs in mediterranean climates, and that both leaf habits are able to meet these costs.What are the mechanisms behind these findings? Deciduous oaks compensated for having a shorter growing season by attaining a greater capacity to assimilate carbon for a given amount of intercepted solar radiation during the well‐watered spring period; at saturating light levels, deciduous oaks gained carbon at six times the rate of evergreen oaks. Otherwise, the two leaf habits experienced similar efficiencies in c...
This paper describes the Object Synchronizer pattern which decouples object synchronization from ... more This paper describes the Object Synchronizer pattern which decouples object synchronization from object functionality. This pattern supports several synchronization policies and their customization. This pattern is used when invocations to an object need to be controlled in order to preserve its consistency. The solution described by this pattern provides encapsulation, modularity, extensibility and reuse of synchronization policies.
Grids have some of the lowest ray tracing acceleration structure build times. This is because acc... more Grids have some of the lowest ray tracing acceleration structure build times. This is because acceleration structure construction is analogous to a sorting algorithm. The ideal behavior for a sorting algorithm is to have O (N) time complexity regarding the number of elements. Grids also have O (N) construction time complexity regarding the number of primitives unlike other commonly used acceleration structures, such as kd-trees or bounding volume hierarchies, which have an O (N log N) lower bound. This trait makes grid ray ...
Studies on intra-regional inequality are scarce, particularly for European countries. This paper ... more Studies on intra-regional inequality are scarce, particularly for European countries. This paper aims at further investigating inequality by focusing on wage differences within regions. We consider the case of Portugal which is referred as one of the countries with highest economic inequality. In particular, we analyse the evolution of intra-regional wage inequality between 1995 and 2005, employing the quantile-based decomposition method suggested by Melly (2005). Our results show that wage inequality evolution has been different for the several regions in Portugal, as it increased in some regions and decreased in others. Different changes in the work force composition explain these diverse developments.
In this paper we consider several alternative approaches to analyze gender wage discrimination. B... more In this paper we consider several alternative approaches to analyze gender wage discrimination. Besides the traditional OLS estimator, we use two other approaches to control for sample selection bias problems: the parametric procedure suggested by Vella and Wooldridge, and the Li and Wooldridge semi-parametric estimator. We study the case of Portugal, employing data from the European Community Household Panel. The results reveal that the discrimination estimates are sensitive to the different econometric approaches. In fact, when sample selection bias is taken into account, the discrimination values are reduced and are typically not significant.
The global market offers an extensive catalog of commercial Autonomous Underwater Vehicles with d... more The global market offers an extensive catalog of commercial Autonomous Underwater Vehicles with different shapes, sizes and capabilities. This paper addresses the innovative concept which led to the development of a new commercial AUV product to compete in such a dynamic market. The LAUV was planned to be a lightweight vehicle that can be easily launched, operated and recovered with a minimal operational setup by end-users having heterogeneous backgrounds and without any complex prior training or know-how. Details of the design, installed components, sensors, sonars and operational field results, are discussed herein. The system has been deployed and operated in different environments for different objectives accumulating hundreds of successful real-world missions.
11th International Conference on the European Energy Market (EEM14), 2014
ABSTRACT Renewable energy sources (RES) have unique characteristics that grant them preference in... more ABSTRACT Renewable energy sources (RES) have unique characteristics that grant them preference in energy and environmental policies. However, considering that the renewable resources are barely controllable and sometimes unpredictable, some challenges are faced when integrating high shares of renewable sources in power systems. In order to mitigate this problem, this paper presents a decision-making methodology regarding renewable investments. The model computes the optimal renewable generation mix from different available technologies (hydro, wind and photovoltaic) that integrates a given share of renewable sources, minimizing residual demand variability, therefore stabilizing the thermal power generation. The model also includes a spatial optimization of wind farms in order to identify the best distribution of wind capacity. This methodology is applied to the Portuguese power system.
Twitter is a powerful medium to express views and opinions, in fields such as entertainment, spor... more Twitter is a powerful medium to express views and opinions, in fields such as entertainment, sports and politics. In this project a twitter analysis of a cricket match was done with the help of GICA method to analyse the tweeting patterns of users. The tweeting patterns were then correlated with the match statistics to understand the similarities and contextual information in the tweets.
Objetiva esta pesquisa descrever e analisar as representacoes religiosas dos pentecostais do Asse... more Objetiva esta pesquisa descrever e analisar as representacoes religiosas dos pentecostais do Assentamento Herbert de Souza, localizado no municipio de Moreno, no Estado de Pernambuco. Percebemos no decorrer da investigacao que os assentados pentecostais, todos beneficiados pela acao do Movimento dos Trabalhadores Rurais Sem Terra (MST), atualizam suas representacoes religiosas de acordo com a demanda de vida que os motivou quando da entrada deles nas terras que pertenceram ao Engenho Pinto. Foi constatado tambem que o lugar e o tempo no qual aconteceu a insercao de cada pentecostal fez com que eles desenvolvessem elaboracoes religiosas diferenciadas acerca do Movimento, da terra e do que concebem como pratica religiosa. Assim eles tecem redes simbolicas de significado que dao ordem as suas concepcoes de mundo. Procuramos comparar as representacoes dos pentecostais que ja residiam nas terras do Engenho antes da ocupacao com as daqueles que vieram depois, ja como militantes do MST, ou...
para operações de crédito numa instituição financeira", realizado no ano lectivo de 2007/2008à Fa... more para operações de crédito numa instituição financeira", realizado no ano lectivo de 2007/2008à Faculdade de Ciências da Universidade de Lisboa para o efeito de arquivo e consulta nas suas bibliotecas e publicação do mesmo em formato electrónico na Internet. FCUL, 26 de Outubro de 2008 Marco Moita, supervisor do projecto de João Pereira, aluno da Faculdade de Ciências da Universidade de Lisboa, declara concordar com a divulgação do Relatório do Projecto em Engenharia Informática, intitulado "Implementação de funcionalidades numa solução de notação de risco para operações de crédito numa instituição financeira".
The experiences experienced by men in modernity transform literary narratives, thematically and f... more The experiences experienced by men in modernity transform literary narratives, thematically and formally, establishing the aim to use allegory as an explanatory stage of that new reality. In the book The Origin of German Tragic Drama, by Walter Benjamin, he conceives allegory as the revelation of a hidden truth that does not represent things just as they are, but provides a version of how they were or might have been. As a reflection of the principles implied in that reading, this paper takes Benjamin's allegory as an analytical category aiming at identifying the representation of violence in the short story A hora e a vez de Augusto Matraga (The Hour and Turn of Augusto Matraga), by Guimarães Rosa. Our analysis opens a dialogue with the dialectical perspective, in which social-historical conditioning factors contribute to understand Minas Gerais backlands, whose ethos supplies a perception of the world incorporated by Guimarães Rosas' poetics, widening the view of a violent and enchanting world.
Lecture Notes in Business Information Processing, 2008
The optimization capabilities of RDBMSs make them attractive for executing data transformations t... more The optimization capabilities of RDBMSs make them attractive for executing data transformations that support ETL, data cleaning and integration activities. Despite the fact that many useful data transformations can be expressed as relational queries, an important class of data transformations that produces several output tuples for a single input tuple are not adequately supported by RDBMSs. In this paper we address the issue of extending a RDBMS to include the mapper operator. In particular, we propose an SQL-like syntax together with several logical optimizations involving relational operators and the mapper. Finally, we experimentally compare the mapper operator with RDBMS implementations of one-to-many data transformations and validate the logical optimizations proposed.
Lymphocyte egress from the thymus and from peripheral lymphoid organs depends on sphingosine 1-ph... more Lymphocyte egress from the thymus and from peripheral lymphoid organs depends on sphingosine 1-phosphate (S1P) receptor-1 and is thought to occur in response to circulatory S1P. However, the existence of an S1P gradient between lymphoid organs and blood or lymph has not been established. To further define egress requirements, we addressed why treatment with the food colorant 2-acetyl-4-tetrahydroxybutylimidazole (THI) induces lymphopenia. We found that S1P abundance in lymphoid tissues of mice is normally low but increases more than 100-fold after THI treatment and that this treatment inhibits the S1P-degrading enzyme S1P lyase. We conclude that lymphocyte egress is mediated by S1P gradients that are established by S1P lyase activity and that the lyase may represent a novel immunosuppressant drug target.
We have previously reported that mouse plasmacytoid dendritic cells (DC) produce high levels of I... more We have previously reported that mouse plasmacytoid dendritic cells (DC) produce high levels of IL-12p70, whereas bone marrow-derived myeloid DC and splenic DC produce substantially lower levels of this cytokine when activated with the TLR-9 ligand CpG. We now show that in response to CpG stimulation, high levels of IL-10 are secreted by macrophages, intermediate levels by myeloid DC, but no detectable IL-10 is secreted by plasmacytoid DC. MyD88-dependent TLR signals (TLR4, 7, 9 ligation), Toll/IL-1 receptor domain-containing adaptor-dependent TLR signals (TLR3, 4 ligation) as well as non-TLR signals (CD40 ligation) induced macrophages and myeloid DC to produce IL-10 in addition to proinflammatory cytokines. IL-12p70 expression in response to CpG was suppressed by endogenous IL-10 in macrophages, in myeloid DC, and to an even greater extent in splenic CD8α− and CD8α+ DC. Although plasmacytoid DC did not produce IL-10 upon stimulation, addition of this cytokine exogenously suppressed...
The magnetic properties of a mixed spin-1 and spin-3/2 Ising ferromagnetic system on a cubic latt... more The magnetic properties of a mixed spin-1 and spin-3/2 Ising ferromagnetic system on a cubic lattice are studied by Monte Carlo simulation. In particular the effect of a single-ion anisotropy on the phase diagram is investigated. Some qualitative features of the phase diagram obtained by a cluster variational treatment of the same system are confirmed.
We assessed the differential advantages of deciduousness and evergreenness by examining 26 site‐y... more We assessed the differential advantages of deciduousness and evergreenness by examining 26 site‐years of carbon dioxide, water vapor, and energy flux measurements from five comparable oak woodlands in France, Italy, Portugal, and California (USA). On average, the evergreen and deciduous oak woodlands assimilated and respired similar amounts of carbon while using similar amounts of water. These results suggest that evergreen and deciduous woodlands have specific, and similar, ecological costs in mediterranean climates, and that both leaf habits are able to meet these costs.What are the mechanisms behind these findings? Deciduous oaks compensated for having a shorter growing season by attaining a greater capacity to assimilate carbon for a given amount of intercepted solar radiation during the well‐watered spring period; at saturating light levels, deciduous oaks gained carbon at six times the rate of evergreen oaks. Otherwise, the two leaf habits experienced similar efficiencies in c...
This paper describes the Object Synchronizer pattern which decouples object synchronization from ... more This paper describes the Object Synchronizer pattern which decouples object synchronization from object functionality. This pattern supports several synchronization policies and their customization. This pattern is used when invocations to an object need to be controlled in order to preserve its consistency. The solution described by this pattern provides encapsulation, modularity, extensibility and reuse of synchronization policies.
Grids have some of the lowest ray tracing acceleration structure build times. This is because acc... more Grids have some of the lowest ray tracing acceleration structure build times. This is because acceleration structure construction is analogous to a sorting algorithm. The ideal behavior for a sorting algorithm is to have O (N) time complexity regarding the number of elements. Grids also have O (N) construction time complexity regarding the number of primitives unlike other commonly used acceleration structures, such as kd-trees or bounding volume hierarchies, which have an O (N log N) lower bound. This trait makes grid ray ...
Studies on intra-regional inequality are scarce, particularly for European countries. This paper ... more Studies on intra-regional inequality are scarce, particularly for European countries. This paper aims at further investigating inequality by focusing on wage differences within regions. We consider the case of Portugal which is referred as one of the countries with highest economic inequality. In particular, we analyse the evolution of intra-regional wage inequality between 1995 and 2005, employing the quantile-based decomposition method suggested by Melly (2005). Our results show that wage inequality evolution has been different for the several regions in Portugal, as it increased in some regions and decreased in others. Different changes in the work force composition explain these diverse developments.
In this paper we consider several alternative approaches to analyze gender wage discrimination. B... more In this paper we consider several alternative approaches to analyze gender wage discrimination. Besides the traditional OLS estimator, we use two other approaches to control for sample selection bias problems: the parametric procedure suggested by Vella and Wooldridge, and the Li and Wooldridge semi-parametric estimator. We study the case of Portugal, employing data from the European Community Household Panel. The results reveal that the discrimination estimates are sensitive to the different econometric approaches. In fact, when sample selection bias is taken into account, the discrimination values are reduced and are typically not significant.
The global market offers an extensive catalog of commercial Autonomous Underwater Vehicles with d... more The global market offers an extensive catalog of commercial Autonomous Underwater Vehicles with different shapes, sizes and capabilities. This paper addresses the innovative concept which led to the development of a new commercial AUV product to compete in such a dynamic market. The LAUV was planned to be a lightweight vehicle that can be easily launched, operated and recovered with a minimal operational setup by end-users having heterogeneous backgrounds and without any complex prior training or know-how. Details of the design, installed components, sensors, sonars and operational field results, are discussed herein. The system has been deployed and operated in different environments for different objectives accumulating hundreds of successful real-world missions.
11th International Conference on the European Energy Market (EEM14), 2014
ABSTRACT Renewable energy sources (RES) have unique characteristics that grant them preference in... more ABSTRACT Renewable energy sources (RES) have unique characteristics that grant them preference in energy and environmental policies. However, considering that the renewable resources are barely controllable and sometimes unpredictable, some challenges are faced when integrating high shares of renewable sources in power systems. In order to mitigate this problem, this paper presents a decision-making methodology regarding renewable investments. The model computes the optimal renewable generation mix from different available technologies (hydro, wind and photovoltaic) that integrates a given share of renewable sources, minimizing residual demand variability, therefore stabilizing the thermal power generation. The model also includes a spatial optimization of wind farms in order to identify the best distribution of wind capacity. This methodology is applied to the Portuguese power system.
Twitter is a powerful medium to express views and opinions, in fields such as entertainment, spor... more Twitter is a powerful medium to express views and opinions, in fields such as entertainment, sports and politics. In this project a twitter analysis of a cricket match was done with the help of GICA method to analyse the tweeting patterns of users. The tweeting patterns were then correlated with the match statistics to understand the similarities and contextual information in the tweets.
Uploads
Papers by Joao Pereira