Graded identities of block-triangular matrices

Let $F$ be an infinite field and $UT(d_1,\dots, d_n)$ be the algebra of upper block-triangular matrices over $F$. In this paper we describe a basis for the $G$-graded polynomial identities of $UT(d_1,\dots, d_n)$, with an elementary grading induced by an $n$-tuple of elements of a group $G$ such that the neutral component corresponds to the diagonal of $UT(d_1,\dots,d_n)$. In particular, we prove that the monomial identities of such algebra follow from the ones of degree up to $2n-1$. Our results generalize for infinite fields of arbitrary characteristic, previous results in the literature which were obtained for fields of characteristic zero and for particular $G$-gradings. In the characteristic zero case we also generalize results for the algebra $UT(d_1,\dots, d_n)\otimes C$ with a tensor product grading, where $C$ is a color commutative algebra generating the variety of all color commutative algebras.Comment: 24 pages and 39 references. We have added section 5 in the text about tensor products by color commutative superalgebra

Comportamentos de vinculação indiscriminado em crianças em acolhimento institucional : riscos pré-institucionais

Dissertação de mestrado integrado em Psicologia (área de especialização em Psicologia Clinica e Saúde)O presente estudo teve como objetivo principal estudar os fatores etiológicos préinstitucionais associados ao comportamento indiscriminado de vinculação, numa amostra de crianças em acolhimento institucional em idade pré-escolar. Foi, ainda, avaliada a validade do Rating of Infant and Stranger Engagement (RISE; Riley, Atlas-Corbett & Lyons-Ruth, 2005), medida observacional para a idade do pré-escolar, com base no Procedimento Situação Estranha (Ainsworth, Blehar, Waters, & Wall, 1978). Recorreu-se a uma amostra de 60 crianças institucionalizadas em idade pré-escolar e às respetivas cuidadoras. Foram utilizados questionários sociodemográficos como forma a aceder às experiências pré-institucionais. Crianças institucionalizadas exibiram elevada frequência de comportamento indiscriminado. O abuso de drogas materno e o risco pré-natal mostraram-se associados à manifestação de comportamento indiscriminado. Ademais, quer o risco pré-natal como a psicopatologia materna revelaram-se preditores significativos na explicação do fenómeno em estudo. Por fim, estes resultados remeterão para a possibilidade de que a extrema indisponibilidade emocional materna para atender às necessidades da criança seja foco de atenção fulcral na compreensão da manifestação desta forma perturbada de vinculação.The present study has as main purpose to study the etiological factors pre-institutional associated with indiscriminate attachment behavior on a sample of children in institutional care at preschool. It was also evaluated the validity of the Rating of Infant and Stranger Engagement (RISE; Riley, Atlas-Corbett & Lyons-Ruth, 2005), observational measure the age of preschool, based on the Strange Situation Procedure (Ainsworth, Blehar, Waters, & Wall, 1978). We used a sample of 60 institutionalized children at preschool age and respective caregivers. Sociodemographic questionnaires were used to assess pre-institutional experiences. Institutionalized children exhibited high frequency of indiscriminate behavior. Maternal drug abuse and prenatal risk were associated with the manifestation of indiscriminate behavior. Moreover, prenatal risk and maternal psychopathology are significant predictors in explaining the phenomenon under study. Finally, these results will refer to the possibility of extreme maternal unavailability for the needs of the child as the central focus of understanding the manifestation of this kind of disturbed attachment.Fundação para a Ciência e a Tecnologia (FCT) - Bolsa de Investigação PTDC/PSI-PCL/ 101506/2008; P.I.: Isabel Soare

The role of entrepreneurship support organizations in the promotion of entrepreneurship education

In recent years, entrepreneurship has been growing in importance. European policy makers have been indicating entrepreneurship as a way to reduce the 25.6 million1 people unemployed and, as a consequence to reach higher levels of economic growth. Education has been appointed as a way to stimulate it. In Portugal, Entrepreneurship Support Organizations (ESOs) seem to have been more active in the promotion of entrepreneurship education by contrast to higher education institutions (HEIs). Only in Lisbon, from one ESO in 2010, there are now more than eleven, which represent more than 200 startups2. Thus, the purpose of this thesis is to explore the role of ESOs in the promotion of entrepreneurship education This thesis found that: (1) On the one hand, entrepreneurship education offered by HEIs target people who are perceived as unlikely to get involved in entrepreneurial activity, (2) on the other hand, most other ESOs target people that are more likely to be already engaged in entrepreneurial activity. The comparisons of this thesis findings with the goals of policy makers, allowed concluding that ESOs and HEIs have a complementary role in the promotion of entrepreneurship education. Increasingly, however, ESOs are turning into hybrid organizations, which means that they focus on a wide variety of activities, and this may make the education environment more competitive

Description of seedless grape drying and determination of drying rate

This article compares some empirical models, with one or two parameters, used to describe seedless grape drying at low temperature. Chosen models have, as a common characteristic, an analytical expression for the derivative of dimensionless moisture content with respect to time. Comparison of the results for the simulations of drying kinetics indicates that, despite Page and Silva et alli models well represent the process, the best model is Peleg. For this model, the statistical indicators of the simulation can be considered excellent (the determination coefficient is R2 = 0.99944 and the chi-square is χ^2 = 1.2335 x 10-3)

Determination of metabolite profiles in tropical wines by 1H NMR spectroscopy and chemometrics.

The aim of this work was to determine metabolite profiles of tropical wines produced in northeast Brazil, by using 1H NMR spectroscopy in comoination with chemometric methods to analyze and discrirninate wine samples from 2007 vintages produced by different wineries