Role of the reversible electrochemical deprotonation of phosphate species in anaerobic biocorrosion of steels

Sulphate reducing bacteria are known to play a major role in anaerobic microbiological influenced corrosion of steels, but mechanisms behind their influence are still source of debates as certain phenomena remain unexplained. Some experiments have shown that hydrogen consumption by SRB or hydrogenase increased the corrosion rate of mild steel. This was observed only in the presence of phosphate species. Here the cathodic behaviour of phosphate species on steel was studied to elucidate the role of phosphate in anaerobic corrosion of steel. Results showed: a linear correlation between reduction waves in linear voltammetry and phosphate concentration at a constant pH value; that phosphate ions induced considerable anaerobic corrosion of mild steel, which was sensitive to hydrogen concentration in the solution; and that the corrosion potential of stainless steel in presence of phosphate was shifted to more negative values as molecular hydrogen was added to the atmosphere in the reaction vessel. Phosphate species, and possibly other weak acids present in biofilms, are suggested to play an important role in the anaerobic corrosion of steels via a reversible mechanism of electrochemical deprotonation that may be accelerated by hydrogen removal

Comparison of cloud height and depth from atmospheric modelling and ceilometer measurements

In the current study, the cloud base height obtained from the ceilometer measurements, in Evora (south of Portugal), are compared with the results obtained from atmospheric modelling. The atmospheric model adopted is the nonhydrostatic MesoNH model, initiated and forced by ECMWF (European Centre for Medium-Range weather Forecasts) analyses. Also the simulated cloud depth results are presented. The availability of mesoscale modelling for the region, as well as the cloud local vertical distributions obtained from the ceilometer, provide a good opportunity to compare cloud base height and estimate the errors associated. From the obtained results it is possible to observe that the simulated cloud base height values are in good agreement with the correspondent values obtained from the ceilometer measurements

Funcionalizando o feminino : a irmã-rainha-mãe-esposa-penitente 'sem nome' em Gregorius de Hartmann von Aue

Tendo como base teórica a Namenforschung de Friedhelm Debus e as pesquisas de Gênero de Judith Butler, o presente trabalho pretende discutir as relações estabelecidas entre a personagem masculina, tema da narrativa, e sua mãe/esposa. Sendo assim, nosso foco de análise é a personagem feminina sem nome de Gregorius de Hartmann von Aue. Pretendemos, portanto, comprovar que há uma funcionalização desse feminino na obra em questão.Based on the theoretical Namenforschung by Friedhelm Debus and the Gender research by Judith Butler, this paper discusses the relationship established between the male character, theme of the narrative, and his mother/wife. Thus, our focus of analysis is the unnamed female character of Gregorius of Hartmann von Aue. We intend, therefore, to prove that there is a functionalization of this feminine in the work in question

A morte como passagem : Terra, Paraíso e Inferno em Armer Heinrich (Pobre Henrique) de Hartmann von Aue

Vários são os discursos sobre a morte durante o século XII. Além dos discursos propagados pelo clero e toda a literatura religiosa, a literatura em médio-alto-alemão também abarcou o tema à sua maneira. Nesse sentido, a obra Armer Heinrich de Hartmann von Aue reelabora alguns saberes acerca da morte e da transitoriedade da vida, que aqui serão apresentados e discutidos.There are several discourses about death in the XII century. In addition to the discourses disseminated by the clergy and religious literature, the Middle High German literature also covered the theme in its own manner. Accordingly, the work Armer Heinrich by Hartmann von Aue re-elaborates the knowledge about death and the transience of life, which are presented and discussed here

Functionalizing the feminine : the 'unnamed'sister-queen-mother-wifepenitent in Gregorius by Hartmann von Aue

Resum disponible en anglèsBased on the theoretical Namenforschung by Friedhelm Debus and the Gender research by Judith Butler, this paper discusses the relationship established between the male character, theme of the narrative, and his mother/wife. Thus, our focus of analysis is the unnamed female character of Gregorius of Hartmann von Aue. We intend, therefore, to prove that there is a functionalization of this feminine in the work in question

The death as passing: Earth, Paradise, and Hell in Armer Heinrich by Hartmann von Aue

There are several discourses about death in the XII century. In addition to the discourses disseminated by the clergy and religious literature, the Middle High German literature also covered the theme in its own manner. Accordingly, the work Armer Heinrich by Hartmann von Aue re-elaborates the knowledge about death and the transience of life, which are presented and discussed here

Descobrindo os sons: brincando e aprendendo

Trabalho de Conclusão do Curso de Especialização em Educação Infantil - 1ª Edição – Polo Joinville - SC, para a obtenção do Grau de Especialista em Educação InfantilO presente artigo tem o objetivo de refletir sobre o processo de intervenção pedagógica realizado no Centro de educação infantil ARTE VIDA com crianças de um a três anos de idade no sentido de vivenciar a música em diversas situações do dia a dia explorando os sons, seja pelo som da voz, corpo ou objetos diversos. Do ponto de vista teórico este artigo seguiu as orientações das Diretrizes Curriculares Nacionais para a Educação Infantil, que enfatizam a exploração do universo cotidiano, no eixo norteador, Conhecimento de Mundo. A pesquisa bibliográfica de referência centrou-se nos pressupostos de Freire (1987), Vygotsky (1991) Zilma Moraes (2010) e outros. Por meio de atividades lúdicas, o trabalho de intervenção pedagógica possibilitou a descoberta de vários sons retirados de materiais sonoros, despertando a curiosidade e o desenvolvimento musical nas crianças envolvidas no projeto