We provide evidence of an extreme form of sensitivity to initial conditions in a family of onedimensional self-ruling dynamical systems. We prove that some hyperchaotic sequences are closed-form expressions of the orbits of these pseudo-random dynamical systems. Each chaotic system in this family exhibits a sensitivity to initial conditions that encompasses the sequence of choices of the evolution rule in some collection of maps. This opens a possibility to extend current theories of complex behaviors on the basis of intrinsic uncertainty in deterministic chaos.
In this paper, we demonstrate that the intrinsic electric field created by a poly(o-methoxyaniline) (POMA) cushion layer hinders the changes in molecular conformation of poly(p-phenylenevinylene) (PPV) in layer-by-layer with dodecylbenzene sulfonic acid (DBS). This was modeled with density functional theory (DFT) calculations where an energy barrier hampered molecular movements of PPV segments when they were subjected to an electric field comparable to that caused by a charged POMA layer. With restricted changes in molecular conformation, the PPV film exhibited Franck-Condon transitions and the photoexcitation spectra resembled the absorption spectra, in contrast to PPV/DBS films deposited directly on glass, with no POMA cushion. Other effects from the POMA cushion were the reduced number of structural defects, confirmed with Raman spectroscopy, and an enhanced PPV emission at high temperatures (300 K) in comparison with the films on bare glass. The positive effects from the POMA cushion may be exploited for enhanced opto-electronic devices, especially as the intrinsic electric field may assist in separating photoexcited electron-hole pairs in photovoltaic devices.
Objetivou-se descrever os fatores psicossomáticos associados a ocorrência de endometriose. Trata-se de um estudo de revisão da literatura, cuja busca foi realizada nas seguintes bases de dados: Scientific Electronic Library Online (SciELO), Web of Science e National Library of Medicine (PubMed) e Literatura Latino-Americana e do Caribe em Ciências da Saúde (LILACS). Nesta revisão, foram selecionados 23 estudos que respondiam à questão norteadora da pesquisa. Os resultados dos estudos demostraram que dentre os fatores psicossomáticos que podem ocorrer em decorrência da endometriose destaca-se que a dor crônica pode levar a um aumento do estresse e da ansiedade, podendo ocasionar irritabilidade, dificuldade de concentração, insônia e alterações de humor. A doença também pode interferir nas atividades diárias e afetar a qualidade de vida das mulheres acometidas, levando a sentimento de frustração, tristeza e isolamento social. O diagnóstico da doença pode ser emocionalmente desafiador, podendo gerar tristeza, raiva e até depressão. Além disso, a dispareunia que ocorre em decorrência da doença, pode afetar a vida sexual e emocional da pessoa. Esses fatores psicossomáticos variam de uma pessoa para outra e nem todas as mulheres com a doença poderão apresentar esses sintomas. Conclui-se que é importante que essas mulheres tenham suporte médico e psicológico adequado, buscando um tratamento abrangente e multidisciplinar para lidar com as questões físicas e emocionais relacionadas à doença.
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