Análise estrutural não linear pelo metodo dos elementos finitos utilizando-se relaxação viscosa acelerada

Neste trabalho discute-se a utilizacfio da técnica de relaxacáo viscosa para a solucao de equacoes do método dos elementos finitos, visando-se a sua implementacao em computadores de processamento paralelo/vetorial. Os problemas de convergencia e número de iteracoes foram minimizados de modo a obter-se um algoritmo seguro e versátil, que oferece as seguintes vantagens: simplicidades de implementacáo , reduzida memória central e facilidade de refinamento e modificacóes da malha. Sfio apresentados estudos relativos a dois casos clássicos de leitura, tanto em regime linear quanto elástico plástico.This paper discusses the implementation of the accelerated viscous relaxation technique to be used in nonlinear finite element analysis on vector/parallel computers. The resulted approach have significant advantages: reduced central storage, great efficiency and the suitability for adaptative finite element analysis. Two classic elasto-plastic cases are studied and the obtained performance are examined for the linear and nonlinear ranges. 1s the authors opinion that the generated software can be considered as an engineering tool to treat complex problems with economy and versatility.Peer Reviewe

Análise estrutural não linear pelo metodo dos elementos finitos utilizando-se relaxação viscosa acelerada

Neste trabalho discute-se a utilizacfio da técnica de relaxacáo viscosa para a solucao de equacoes do método dos elementos finitos, visando-se a sua implementacao em computadores de processamento paralelo/vetorial. Os problemas de convergencia e número de iteracoes foram minimizados de modo a obter-se um algoritmo seguro e versátil, que oferece as seguintes vantagens: simplicidades de implementacáo , reduzida memória central e facilidade de refinamento e modificacóes da malha. Sfio apresentados estudos relativos a dois casos clássicos de leitura, tanto em regime linear quanto elástico plástico.This paper discusses the implementation of the accelerated viscous relaxation technique to be used in nonlinear finite element analysis on vector/parallel computers. The resulted approach have significant advantages: reduced central storage, great efficiency and the suitability for adaptative finite element analysis. Two classic elasto-plastic cases are studied and the obtained performance are examined for the linear and nonlinear ranges. 1s the authors opinion that the generated software can be considered as an engineering tool to treat complex problems with economy and versatility.Peer Reviewe

Bigels as a vehicle for bioactives compounds: assessment of in vitro digestion behavior

Bigels are novel complex biphasic systems composed by organic and aqueous gelled phases that can act as texture modifiers, and vehicle for topical and gastrointestinal delivery of hydrophilic/lipophilic bioactives. However, its behavior through digestion has still not been assessed. Moreover, process conditions can change their structure and consequently the bioactive stability and release. Thus, the aim of this work was to evaluate the influence of the process on bigels structure and behavior through gastrointestinal tract. Bigels were produced with gellan gum hydrogel (1.25% w/w) and high oleic sunflower oil+glycerol monostearate (10% w/w) organogel loaded with 0.1% curcumin. Gelling agents were solubilized separately (80 °C, 30 min) and then mixed by cold or hot-emulsification method. Cold-set was carried out mixing gelled systems by mechanical stirring (50 °C, 1,000 min-1, 10 min). Hot-emulsification was performed with addition of 2% (w/w) Tween 80 by mechanical stirring (same conditions) or rotor-stator device (50 °C, 14,000 min-1, 2 min). Bigels were submitted to an in vitro gastrointestinal digestion using the harmonized digestion method, and changes were assessed through fluorescent microscopy. At the end of digestion, free fatty acids (FFA) released and bioaccessibility and stability of curcumin were determined. Cold-set bigels showed W/O structure while hot-emulsification led to W/O bigels with smaller droplets when rotor-stator was used. The results from the in vitro digestion indicated that all bigels were stable after stomach conditions, however, they destabilized during intestinal conditions. Besides, O/W bigels showed higher stability with less droplets coalescence, due to the surfactant presence. FFA and curcumin stability followed the same tendency, with higher values for O/W bigels. However, despite the higher stability, the effective bioavailability was similar for all bigels produced. Thus, independent of the structure and physical properties, bigels could be used for protection and oral delivery of hydrophobic bioactives and are promising systems for concomitant hydrophilic/hydrophobic loading.FCTCOMPETE 2020NORTE 2020This study was supported by the Portuguese Foundation for Science and Technology (FCT) under the scope of the strategic funding of UID/BIO/04469/2019 unit and BioTecNorte operation (NORTE-01-0145-FEDER-000004) funded by the European Regional Development Fund under the scope of Norte2020 - Programa Operacional Regional do Norte.info:eu-repo/semantics/publishedVersio

Estudo da suscetibilidade da Biomphalaria glabrata de Ourinhos (SP), à infecção pelo Schistosoma mansoni de Belo Horizonte (MG), e de São José dos Campos (SP)

Foi estudada a suscetibilidade da Biomphalaria glabrata de um foco de Schistosoma mansoni no município de Ourinhos, (SP, Brasil). Concluiu-se pela alta capacidade desses moluscos à infecção pelas cepas de S. mansoni de Belo Horizonte, Minas Gerais e de São José dos Campos, São Paulo.The susceptibility of Biomphalaria glabrata from Ourinhos, São Paulo, to strains of Schistosoma mansoni from Belo Horizonte, Minas Gerais and S. José dos Campos, S. Paulo, was studied. It was conclude that the molluscs has a high susceptibility to both strains of Schistosoma mansoni

Nouvel Oriocrassatellinae du Pennsylvanien du Brésil et distribution spatio-temporelle d’Oriocrassatella

Oriocrassatella Etheridge Jr., 1907 is a long range crassatellid bivalve genus well recognized in shallow waters of epeiric seas throughout the upper part of Paleozoic. The first occurrences of this genus are recorded in the sedimentary successions of the Gondwana, both in Australia and South America. However, the geographic and age distribution of Oriocrassatella in Late Mississippian deposits of Australia and Argentina may indicate an earliest Visean or even a pre-Visean origin for the genus. Following its origin in Early Carboniferous a complex paleobiogeographic history from Southern to Northern Hemisphere took place in the Permian. During its initial dispersal phase from Late Carboniferous to the Early Permian the genus thrived in cold water environments associated to the Late Paleozoic Gondwana glaciation. Shallow-water bottoms of the warm waters of the central Gondwana fringe and Laurussia were colonized by Oriocrassatella only during Early Permian times when the genus became cosmopolitan. A new species of this genus is described herein, Oriocrassatella piauiensis n.   sp., recorded from the Piauí Formation, Pennsylvanian of the Parnaíba Basin. This new species may represent an early adaptation to warm waters. However, based on available data, species of this genus seem to have adapted definitely to warm water environments probably related the Late Pennsylvanian interglacial phases. In these phases, climatic barrier were interrupted allowing the faunal interchange and larval dispersion following a South to North migration route through the eastern margins of Gondwana and the eastern Paleotethys.Oriocrassatella Etheridge Jr., 1907 est un crassatellidé à large distribution stratigraphique, bien connu dans les mers épicontinentales en eaux peu profondes, caractéristique du Paléozoïque supérieur. Ce genre apparaît pour la première fois dans des dépôts sédimentaires du Gondwana, en Australie et en Amérique du Sud. D’après sa distribution spatio-temporelle dans des dépôts du Mississippien supérieur, Oriocrassatella serait originaire du début du Viséen, ou même pré-viséenne. Par la suite, depuis le Carbonifère inférieur jusqu’au Permien, ce genre a eu une histoire paléobiogéographique complexe allant de l’hémisphère Sud vers l’hémisphère Nord. Pendant la phase initiale de dispersion à partir du Carbonifère supérieur jusqu’au Permien inférieur, ce genre a prospéré dans un milieu dominé par des eaux froides du Gondwana, suite à la glaciation du Paléozoïque supérieur. Les eaux littorales chaudes du Gondwana central et de Laurussia ont été colonisées par Oriocrassatella uniquement durant le Permien inférieur, parce que ce genre est devenu cosmopolite. Une espèce nouvelle, O. piauiensis n. sp., est décrite de la Formation Piauí du Pennsylvanien du bassin du Parnaíba ; elle pourrait représenter une première adaptation aux eaux chaudes. En outre, et en s’appuyant sur les données disponibles, d’autres espèces d’Oriocrassatella se seraient aussi définitivement adaptées à des milieux en eaux chaudes au cours des périodes interglaciaires du Pennsylvanien tardif, car des barrières climatiques ont disparu, favorisant des échanges de faune avec dispersion des larves, et migration du sud vers le nord le long des bordures est du Gondwana et de la Paléotéthys.Fil: Anelli, Luiz E.. Universidade de Sao Paulo; BrasilFil: Simões, Marcello G.. Universidade Estadual Paulista Julio de Mesquita Filho; BrasilFil: Gonzalez, Carlos Roberto. Fundación Miguel Lillo; Argentina. Consejo Nacional de Investigaciones Científicas y Técnicas. Centro Científico Tecnológico Conicet - Tucumán; ArgentinaFil: Souza, Paulo A.. Universidade Federal do Rio Grande do Sul; Brasi