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Search Results: 1 - 10 of 12526 matches for " Rui Mateus Joaquim "
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Correlation of Disgust and Contempt Expressions with Conjugal Dissatisfaction  [PDF]
Rui Mateus Joaquim, Tariane Franciele Bastos Pereira, Laiza de Oliveira Vilela, Tayná Maiara Pilla Rodrigues, Angela Maria da Silva Muniz Brandino, Sandro Caramaschi
Journal of Behavioral and Brain Science (JBBS) , 2018, DOI: 10.4236/jbbs.2018.810034
Abstract: Research has shown that dissatisfied couples in the relationship commonly exhibit facial expressions of contempt in interactions. At this point, based on the study of cognition and physiology, researchers were able to predict by longitudinal studies the probability of divorce in a marriage, with accuracy of up to 94%. Our objective was to investigate whether the occurrence of facial expressions of disgust and contempt in married women is associated with marital dissatisfaction. This is an experimental study that correlated, through filmed interviews, the frequency of facial expressions of disgust and disgust (Facial Action Coding System) to the Marital State’s Golombok Rust Inventory, in a sample composed of 20 women. Data analysis based on the Spearman Correlation Test showed a positive correlation between facial expressions of disgust and disdain and conjugal dissatisfaction (rs = 0.2198, p = 0.0280), corroborating the data in the literature.
Validation and Calibration of Models for Reaction-Diffusion Systems
Rui Dilao,Joaquim Sainhas
Physics , 1997, DOI: 10.1142/S0218127498000917
Abstract: Space and time scales are not independent in diffusion. In fact, numerical simulations show that different patterns are obtained when space and time steps ($\Delta x$ and $\Delta t$) are varied independently. On the other hand, anisotropy effects due to the symmetries of the discretization lattice prevent the quantitative calibration of models. We introduce a new class of explicit difference methods for numerical integration of diffusion and reaction-diffusion equations, where the dependence on space and time scales occurs naturally. Numerical solutions approach the exact solution of the continuous diffusion equation for finite $\Delta x$ and $\Delta t$, if the parameter $\gamma_N=D \Delta t/(\Delta x)^2$ assumes a fixed constant value, where $N$ is an odd positive integer parametrizing the alghorithm. The error between the solutions of the discrete and the continuous equations goes to zero as $(\Delta x)^{2(N+2)}$ and the values of $\gamma_N$ are dimension independent. With these new integration methods, anisotropy effects resulting from the finite differences are minimized, defining a standard for validation and calibration of numerical solutions of diffusion and reaction-diffusion equations. Comparison between numerical and analytical solutions of reaction-diffusion equations give global discretization errors of the order of $10^{-6}$ in the sup norm. Circular patterns of travelling waves have a maximum relative random deviation from the spherical symmetry of the order of 0.2%, and the standard deviation of the fluctuations around the mean circular wave front is of the order of $10^{-3}$.
Modelling butterfly wing eyespot patterns
Rui Dilao,Joaquim Sainhas
Quantitative Biology , 2005, DOI: 10.1098/rspb.2004.2761
Abstract: Eyespots are concentric motifs with contrasting colours on butterfly wings. Eyespots have intra- and inter-specific visual signalling functions with adaptive and selective roles. We propose a reaction-diffusion model that accounts for eyespot development. The model considers two diffusive morphogens and three non-diffusive pigment precursors. The first morphogen is produced in the focus and determines the differentiation of the first eyespot ring. A second morphogen is then produced, modifying the chromatic properties of the wing background pigment precursor, inducing the differentiation of a second ring. The model simulates the general structural organisation of eyespots, their phenotypic plasticity and seasonal variability, and predicts effects from microsurgical manipulations on pupal wings as reported in the literature.
A non-autonomous SEIRS model with general incidence rate
Joaquim P. Mateus,César M. Silva
Mathematics , 2013,
Abstract: For a non-autonomous SEIRS model with general incidence, that admits [T. Kuniya and Y. Nakata, Permanence and extinction for a nonautonomous SEIRS epidemic model, Appl. Math. Computing 218, 9321-9331 (2012)] as a very particular case, we obtain conditions for extinction and strong persistence of the infectives. Our conditions are computed for several particular settings and extend the hypothesis of several proposed non-autonomous models. Additionally we show that our conditions are robust in the sense that they persist under small perturbations of the parameters in some suitable family. We also present some simulations that illustrate our results.
Existence of periodic solutions of a periodic SEIRS model with general incidence
César M. Silva,Joaquim P. Mateus
Mathematics , 2015,
Abstract: For a family of periodic SEIRS models with general incidence, we prove the existence of at least one endemic periodic orbit when R_0>1. Additionally, we prove the existence of a unique disease-free periodic orbit, that is globally asymptotically stable when R_0<1. In particular, our main result establishes a sharp threshold between existence and non-existence of endemic periodic orbits for this family of models.
Interven??o educativa na perturba??o Gilles De La Tourette
Ramalho, Joaquim;Mateus, Filipa;Souto, Marisa;Monteiro, Marlene;
Revista Brasileira de Educa??o Especial , 2008, DOI: 10.1590/S1413-65382008000300002
Abstract: gilles de la tourette syndrome is a neuropsychological condition, caused by multiple disorders in brain neurotransmitters. it is characterized by compulsive phenomena that give rise to motor and vocal tics, resulting in social and emotional problems, especially in integration and adaptation in school. the present article aims to improve knowledge of this disorder, including related symptoms, as well as to develop educational intervention strategies for various educational agents, so as to foster more efficient school and social integration.
Dealing with Past Colonial Conflicts: How Perceived Characteristics of the Victimized Outgroup Can Influence the Experience of Group-Based Guilt
Ana Mateus Figueiredo,Bertjan Doosje,Joaquim Pires Valentim,Sven Zebel
International Journal of Conflict and Violence , 2010,
Abstract: An examination of potential outgroup-focused predictors of group-based guilt relating to past colonial conflicts involving Portugal and the Netherlands, specifically, the role of the perceptions of the ingroup towards the victimized outgroup, as well as on outgroup identification and meta-perceptions (i.e. the ingroup's beliefs regarding the outgroup's perceptions of it). Using Structural Equation Modeling in a Portuguese sample (N = 178) and a Dutch sample (N = 157), we found that the experience of group-based guilt due to colonial conflicts can be positively predicted by outgroup perceptions and outgroup identification (Dutch sample only). Meta-perceptions were a negative predictor of group-based guilt (Dutch sample only). Furthermore, our results show that group-based guilt is positively associated with compensatory behavioral intentions and perceived importance of remembering past colonial conflicts. Results point to the important role of outgroup-focused variables in shaping group-based guilt experiences relating to past conflicts between groups. The findings suggest possible avenues of further research and ways to improve intergroup relations following conflict.
Integration strategy under demand uncertainty: a real option approach
Pinho,Carlos; Fernandes,Rui; Gouveia,Joaquim Borges;
Economia Global e Gest?o , 2012,
Abstract: global outsourcing has emerged as one of the major approaches to gaining a worldwide competitive edge for many industries. this paper investigates companies’ flexibility, in very uncertain markets, in adapting their internal capacity so as to become an alternative to outsourcing. the capacity to be installed and the related resources allocation will be determinant for timing the change. we intend to quantify the impact of anticipating a capacity expansion, treated as a partially irreversible investment. unlike earlier studies, it provides analytical research on the probability of switching from outsourcing to an integration option, and the expected timing of the switch under two regimes: full and partial insourcing.
Medi??o da incerteza da procura numa cadeia de abastecimento com múltiplos pontos de inventário
Fernandes,Rui; Gouveia,Joaquim Borges; Pinho,Carlos;
Revista Portuguesa e Brasileira de Gest?o , 2011,
Abstract: the main goal of this study is the definition of an indicator able to measure the impact of demand volatility in different supply chain stages. specifically, we aim the importance of the uncertainty measurement, at different points in a supply chain, in order to support managers in defining the optimal inventory levels. with this metric, managers are able to establish more reliable and aligned inventory targets, considering the risk exposure and promoting the invested capital optimisation. the model is based on the real options methodology. overall, our investigation increases the knowledge related with inventory optimisation and supply chain performance under uncertainty environments. the numerical application supports the conclusion about the adverse effects on the invested capital value, as a result of the introduction of non-optimal values ??in sequential stages, considering different uncertainty penetration levels.
Integration strategy under demand uncertainty: a real option approach Estratégia de integra o com incerteza da procura: abordagem das op es reais
Carlos Pinho,Rui Fernandes,Joaquim Borges Gouveia
Economia Global e Gest?o , 2012,
Abstract: Global outsourcing has emerged as one of the major approaches to gaining a worldwide competitive edge for many industries. This paper investigates companies’ flexibility, in very uncertain markets, in adapting their internal capacity so as to become an alternative to outsourcing. The capacity to be installed and the related resources allocation will be determinant for timing the change. We intend to quantify the impact of anticipating a capacity expansion, treated as a partially irreversible investment. Unlike earlier studies, it provides analytical research on the probability of switching from outsourcing to an integration option, and the expected timing of the switch under two regimes: full and partial insourcing. O outsourcing global emergiu como uma das principais abordagens em muitas indústrias, tendo em vista ganhar vantagem competitiva. Neste trabalho analisa-se a flexibilidade das empresas em adaptar a sua capacidade interna de forma a se tornar uma alternativa ao outsourcing em mercados com elevada incerteza. A capacidade a ser instalada e a afeta o de recursos relacionados ser o determinantes do momento de alterar a estratégia. Neste trabalho desenvolve-se um modelo de investimento parcialmente irreversível, tendo em vista a quantifica o do impacto de antecipar um aumento de capacidade. Analisa-se ainda a probabilidade de altera o da escolha de outsourcing para uma situa o de integra o, sendo analisado o momento ótimo da altera o em dois regimes distintos: insourcing parcial ou total.
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