Navegando por Assunto "Filters"

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Acesso aberto (Open Access)
Theoretical study of plasmonically induced transparency effect in arrays of graphene-based double disk resonators
(Sociedade Brasileira de Micro-ondas e Optoeletrônica, 2019-03) PORTELA, Gianni Masaki Tanaka; DMITRIEV, Victor Alexandrovich; OLIVEIRA, Cristiano Braga de; CASTRO, Wagner Ormanes Palheta
In this paper, we consider coupled disk-shaped resonators separated by a thin dielectric substrate that can be used as frequency-tunable filters or as electromagnetic switches in the terahertz frequency band. The two disks are electromagnetically coupled and resonate with dipole plasmonic modes. By using a Temporal Coupled-Mode Theory based approach, we show how to analytically calculate the frequency response of such structures.The analytical results are in good agreement with those obtained from computational simulations based on the finite element method.
Acesso aberto (Open Access)
O uso de tecnologias sociais para o fornecimento de água potável na comunidade Nossa Senhora de Fátima
(Universidade Federal do Pará, 2021-11-05) SILVA, Neide Andrade da; SILVA, Cleber Silva e; http://lattes.cnpq.br/7673237583688618; https://orcid.org/0000-0001-7086-8751
Inappropriate water resources for human consumption can cause waterborne diseases. Therefore, the use of drinking water is of fundamental importance for health and good quality of life. This work was based on proposing the construction and use of handcrafted filters, at low cost, as sociais technologies aimed at obtaining drinking water in the Nossa Senhora de Fátima community in the Jardim Tropical neighborhood in the municipality of Breves. To achieve the proposed objective, it was necessary to identify the characteristics of the community where the work was carried out. It was also necessary to show, through an interactive educational lecture, the importance of conserving water resources and which filters can be built (at low cost) and used to lead a healthier life. In addition, it was essential to produce a guide, in digital format, of handcrafted filters. Semi-structured interviews were carried out with the parish priest and the Community Leader in the Category of Managers (CG), in addition to multiple-choice questionnaires being applied to 18 community members in the Community Category (CC). With this study it was found that the community of Nossa Senhora de Fatima is configured with a low-income profile and does not have access to drinking water, one of the most basic human rights. Thus, by building and using low-cost handmade filters, they obtained, for a minimum amount and in a sustainable way, water suitable for human consumption, thus contributing to reduce the spread of waterborne diseases.