Sir
Mostrando 1-12 de 648 artigos, teses e dissertações.
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1. A SIR Model with Spatially Distributed Multiple Populations Interactions for Disease Dissemination
ABSTRACT In this contribution we analyze a discretized SIR (Susceptible, Infectious, and Removed) compartmental model, to investigate the role of individual interactions in the spread of diseases. The compartments S i,j , I i , j and R i , j ( i , j , = 1 , 2 , . . . , n ) are spatially distributed in a two-dimensional n × n network. We assume tha
Trends in Computational and Applied Mathematics. Publicado em: 2022
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2. Dynamic Systems with Fractional Derivatives Applied to Interagent Populations Problems
ABSTRACT The present work has as main objective to investigate the use of fractional calculus in the modeling of epidemic outbreaks of interacting populations. In particular, we propose a generalization of the SIR model with fractional derivatives to describe the dynamics of the COVID-19 epidemic outbreak in two cities with interacting populations. In specia
Trends in Computational and Applied Mathematics. Publicado em: 2022
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3. A Design of a Compact Microwave Diplexer in Microstrip Technology Based on Bandpass Filters Using Stepped Impedance Resonator
Abstract This paper describes the design of a compact microstrip microwave diplexer based on bandpass filters and a stepped impedance resonator for 4G applications. The diplexer is composed of two band-pass filters (BPF) that operate at 1.8 and 2.5 GHz. Both bandpass filters for the receiver at 1.705-1.895 GHZ and the transmitter at 2.41-2.6 GHZ have a -3dB
Journal of Microwaves, Optoelectronics and Electromagnetic Applications. Publicado em: 2022
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4. The effects of thymoquinone on pancreatic cancer and immune cells
SUMMARY OBJECTIVES: Black cumin is widely used as a spice and as a traditional treatment. The active ingredient in black cumin seeds is thymoquinone. Thymoquinone has shown anticancer effects in some cancers. We planned to investigate its anticancer effect on pancreatic cancer cell lines. METHODS: Thymoquinone chemical component in various doses was prepar
Revista da Associação Médica Brasileira. Publicado em: 2022
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5. Transoral thyroidectomy-learning curve
ABSTRACT Objective: The treatment of patients with differentiated thyroid cancer (DTC) was modified in the last decade towards a more individualized approach according to the risk of recurrence (RR). We compared the outcomes of patients with low and intermediate RR (LRR and IRR) who received or did not receive radioiodine remnant ablation (RRA) after assess
Arch. Endocrinol. Metab.. Publicado em: 2021-06
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6. Dynamic risk allows us to adequately select patients with differentiated thyroid cancer who do not require radioiodine treatment
ABSTRACT Objective: The treatment of patients with differentiated thyroid cancer (DTC) was modified in the last decade towards a more individualized approach according to the risk of recurrence (RR). We compared the outcomes of patients with low and intermediate RR (LRR and IRR) who received or did not receive radioiodine remnant ablation (RRA) after assess
Arch. Endocrinol. Metab.. Publicado em: 2021-06
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7. Transoral thyroidectomy: A reflexive opinion on the technique
ABSTRACT Objective: The treatment of patients with differentiated thyroid cancer (DTC) was modified in the last decade towards a more individualized approach according to the risk of recurrence (RR). We compared the outcomes of patients with low and intermediate RR (LRR and IRR) who received or did not receive radioiodine remnant ablation (RRA) after assess
Arch. Endocrinol. Metab.. Publicado em: 2021-06
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8. On equilibria stability in an epidemiological SIR model with recovery-dependent infection rate
RESUMO Neste artigo é considerado um modelo epidemiológico SIR cuja taxa de infeção depende da população removida. São estabelecidas condições suficientes para a existência, unicidade e estabilidade (local e global) de equilíbrios endêmicos e é considerada também a estabilidade das soluções de equilíbrio livres da infecção. É mostrado que
TEMA (São Carlos). Publicado em: 2020-12
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9. Roger Casement in the Twenty-first Century: The public and private faces of a multi-media Irish hero
Abstract: Sir Roger Casement (1864-1916) was a diplomat in the British Colonial Service and an Irish nationalist who was hanged for high treason in London in 1916. The first part of this article offers a critical overview of the material that has been published about Casement's humanitarian work in the Congo and the Peruvian Amazon and his trial in London, i
Ilha Desterro. Publicado em: 2020-08
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10. Modified Ring Power Divider Using Stepped-Impedance Resonator
Abstract In this paper, the design of a modified ring power divider dedicated for wideband communication or measurement systems is presented. The proposed power divider is built by using a conventional ring power divider and an additional Stepped-Impedance Resonator (SIR). The even-odd mode analysis is used to derive the design equations. In order to observe
J. Microw. Optoelectron. Electromagn. Appl.. Publicado em: 2020-03
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11. Lady Frazer e seu marido. Gênero e anomalia na história da antropologia
Resumo Dois pontos destacam-se da leitura de Antropólogas & Antropologia, de Mariza Corrêa, a quem este artigo faz homenagem: primeiro, a importância do gênero como uma categoria para se repensar a história da antropologia; segundo, a capacidade metodológica da anomalia para iluminar as contradições do sistema normativo ao qual se refere. Tais pontos
Cad. Pagu. Publicado em: 29/11/2018
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12. Modelos de mistura e isótopos estáveis como ferramentas para pesquisas sobre alimentação de organismos aquáticos
RESUMO: Os modelos de mistura nas análises isotópicas vêm sendo cada vez mais utilizados devido à necessidade de analisar as fontes alimentares e compreender suas variações em relação aos consumidores, o que requer uma adequada determinação de suas taxas discriminantes e fracionamentos. Neste contexto, objetivamos apresentar os principais conceitos
Cienc. Rural. Publicado em: 19/07/2018