In this paper a definition for the property of behavioral invariance is proposed with the purpose of generalizing the state space geometric approach to the behavioral setting. Based on this notion together with the well-known notion of behavioral observer, a definition of conditioned invariance is also presented. The results obtained for the characterization of the defined properties put into evidence some prob...
Dissertação para obtenção do grau de Mestre em Design de Comunicação
We prove that Julia sets are uniformly perfect in the sense of Pommerenke (Arch. Math. 32 (1979), 192-199). This implies that their linear density of logarithmic capacity is strictly positive, thus implying that Julia sets are regular in the sense of Dirichlet. Using this we obtain a formula for the entropy of invariant harmonic measures on Julia sets. As a corollary we give a very short proof of Lopes converse...
O artigo discute a relação entre comunicação e gestão de obras, a partir dos conceitos da Escola de Montreal de comunicação organizacional. Na revisão conceitual são apresentadas duas orientações teóricas: (a) a gestão de obras como organização temporária, uma construção social de pessoas reunidas em determinado período de tempo; (b) a organização como uma constante tradução de conversações em textos. Os método...
This paper is a contribution to extend the study of structured dynamical systems to the case of systems evolving over two-dimensional domains, i.e., 2D systems. In particular, we consider 2D Fornasini-Marchesini state space models and obtain necessary and sufficient conditions for structured global reachability. Such conditions are stated in terms of the generic rank and the irreducibility of suitably defined m...
Dissertação (mestrado)—Universidade de Brasília, Instituto de Ciências Biológicas, Programa de Pós-Graduação em Biologia Animal, 2009. ; A preocupação dos efeitos de cianobactérias na saúde humana cresce em muitos países. Casos de florações de cianobactérias em reservatórios e lagos criam problemas para o abastecimento de água, além de envenenamento, tanto animal como humano, se tornando uma preocupação para...
Studies of genotoxicity in fish caused by cyanobacterial microcystins can be useful both in determining the sensitivity of native species, as well as comparing exposure routes. The genotoxicity caused by the microcystins LR and LA from a bloom collected in a eutrophic lake, was revealed in the fish Astyanax bimaculatus, a native species from South America. LC50 (72 h) was determined as 242.81 µg L-1 and LD50 (7...
In this paper the new concept of 2D structured system is defined and a characterization of global reachability is obtained. This extends a well known result for 1D structured systems, according to which (A ,B ) is (generically) reachable if and only if the matrix [A B] is full generically row rank and irreducible.
The past few years have seen a surge of interest in the field of probabilistic logic learning and statistical relational learning. In this endeavor, many probabilistic logics have been developed. ProbLog is a recent probabilistic extension of Prolog motivated by the mining of large biological networks. In ProbLog, facts can be labeled with probabilities. These facts are treated as mutually independent random va...
Nas últimas três décadas, em Portugal, registou-se um aumento médio da área ardida natural e do número médio de ocorrências, apesar dos esforços envolvidos na sua prevenção e combate. Após as duas vagas de incêndios de 2003 e 2005, em que arderam mais de 750.000 hectares de área florestal no país, ocorreram mudanças significativas na integração dos riscos dos incêndios nos objectivos prioritários do Ordenamento...
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