115 research outputs found

    Insights and Next Challenges for the Italian Educational System to Teach Sustainability in a Global Context

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    Education is recognized as a dimension in which a more sustainable future can be promoted and supported. It is described both as a specific goal under the UN Sustainable Development Goals (SDGs) and as a goal within other SDGs. Since sustainability can be taught at all levels of education, students progressively acquire a variable knowledge of these issues and find academic, professional and social contexts in which they are expected to implement this knowledge. Italian universities could gradually adapt to incorporate this knowledge through specific courses, the integration of sustainability in learning programs, and the promotion of sustainable behaviors. This offers a unique opportunity to integrate sustainability in didactic activities and in the whole academic environment, presenting the university as a model for a more sustainable life. The same path can be followed by other institutions engaged in lifelong learning and improving general education and sustainability literacy. This essay presents a general diagnosis of the current situation in the global and national integration of sustainability in education, the level of knowledge of Italian students and teaching staff about sustainability, why this knowledge should be enhanced, and how lifelong learning can harmoniously continue the process to achieve such integration

    Preferência alimentar do percevejo, barriga-verde, Dichelops furcatus (f.) em plantas de trigo em diferentes estádios fenológicos.

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    Editores técnicos: Joseani Mesquita Antunes, Ana Lídia Variani Bonato, Márcia Barrocas Moreira Pimentel

    Extrato de bergamota (Citrus reticulata) como inibidor natural contra a corrosão em aço

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    Aços carbono são amplamente empregados na construção civil, especialmente em estruturas metálicas, sendo este material a principal matéria-prima para confecção de estruturas. Entretanto, uma grande desvantagem da utilização do aço carbono é sua baixa resistência à corrosão o que o torna um material suscetível a processos corrosivos. O efeito inibidor do extrato natural de cascas de bergamota (Citrus reticulata) frente ao processo corrosivo de aço carbono ASTM A36 foi investigado por meio de ensaios de perda de massa de corpos de prova por imersão em meio corrosivo, conjugados com análises de isotermas de adsorção. Resultados demonstram que o extrato de bergamota apresenta considerável ação inibidora de corrosão em aço carbono ASTM A36 em meio ácido (HCl 0,1 mol•L-1). O efeito da temperatura foi avaliado, verificando-se que a eficiência de inibição varia consideravelmente com o aumento da temperatura.  A maior eficiência de inibição contra corrosão observada foi de 86 ± 2% em meio ácido, para uma temperatura de ensaio de 30 ºC e concentração de 40g/L de extrato de bergamota.  Além disso, as isotermas de adsorção mostraram que a o melhor ajuste foi para a isoterma de Langmuir, cujo coeficiente de correlação linear encontrado foi de 0,998 indicando que o comportamento do extrato obedece a essa isoterma. Assim, os resultados obtidos sugerem que o extrato de bergamota apresenta potencial para ser empregado na proteção contra a corrosão em aço carbono ASTM A36 em meio ácido

    Rotating curved spacetime signatures from a giant quantum vortex

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    \ua9 The Author(s) 2024.Gravity simulators1 are laboratory systems in which small excitations such as sound2 or surface waves3,4 behave as fields propagating on a curved spacetime geometry. The analogy between gravity and fluids requires vanishing viscosity2–4, a feature naturally realized in superfluids such as liquid helium or cold atomic clouds5–8. Such systems have been successful in verifying key predictions of quantum field theory in curved spacetime7–11. In particular, quantum simulations of rotating curved spacetimes indicative of astrophysical black holes require the realization of an extensive vortex flow12 in superfluid systems. Here we demonstrate that, despite the inherent instability of multiply quantized vortices13,14, a stationary giant quantum vortex can be stabilized in superfluid 4He. Its compact core carries thousands of circulation quanta, prevailing over current limitations in other physical systems such as magnons5, atomic clouds6,7 and polaritons15,16. We introduce a minimally invasive way to characterize the vortex flow17,18 by exploiting the interaction of micrometre-scale waves on the superfluid interface with the background velocity field. Intricate wave–vortex interactions, including the detection of bound states and distinctive analogue black hole ringdown signatures, have been observed. These results open new avenues to explore quantum-to-classical vortex transitions and use superfluid helium as a finite-temperature quantum field theory simulator for rotating curved spacetimes19
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