Population Dynamics
Mostrando 1-12 de 964 artigos, teses e dissertações.
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1. Health Professionals and the Dynamics of COVID-19 in Manaus during the First Wave
ABSTRACT A model is made for the dynamics of the transmission of the new SARS-CoV-2 coronavirus, which caused the COVID-19 pandemic. This model is based on the Susceptible-Infectious-Recovered model with heterogeneity in the susceptible population and in the infectious population. The susceptible population is divided into two subpopulations: individuals who
Trends in Computational and Applied Mathematics. Publicado em: 2022
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2. 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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3. Phytonematode population dynamics in common bean cultivation under crop rotation and no-tillage conditions
ABSTRACT Strategies for conserving natural resources and reducing agricultural inputs are the great challenge for agriculture, such as sustainable alternatives to control agricultural pests of high economic impact, e.g. plant-parasitic nematodes. This work aimed to evaluate phytonematode’s population dynamics in common bean cultivation grown under crop rot
Revista Ceres. Publicado em: 2022
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4. Universal Approximators: New Approach for the Curve Fit of the COVID-19 Infected Population
ABSTRACT Fuzzy systems that include Takagi-Sugeno inference method with linear outputs, are widely known to have the ability to uniformly approximate any polynomial with high precision and, as a consequence, any continuous function, by applying the approximation theorem of Weierstrass. There is one more advantage for these methods which is to obtain an expli
Trends in Computational and Applied Mathematics. Publicado em: 2022
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5. A Model of Social Distancing for Interacting Age-Distributed Multi-Populations: An Analysis of Students’ In-Person Return to Schools
ABSTRACT Because of the current scenario of the SARS-CoV-2 (COVID-19) pandemic in Brazil, whose vaccination campaign is in its initial stage, government authorities have pointed towards the complete reopening of the economy. And recently, for the in-personal return of classroom teaching in schools. Given the family relationship, one of the questions that rem
Trends in Computational and Applied Mathematics. Publicado em: 2022
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6. Record of Conotelus luteicornis Erichson (Coleoptera: Nitidulidae) in passion fruit vine in Acre state, Brazil
ABSTRACT The first record of Conotelus luteicornis Erichson (Coleoptera: Nitidulidae) was made in a commercial passion fruit vine planting in the municipality of Senador Guiomard, Acre state, Brazil. The insects were found inside the flowers where larvae and adults feed, causing early abortion and, consequently, losses in production. Therefore, the first rec
Rev. Ceres. Publicado em: 2021-08
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7. Mortality from malignant skin melanoma in elderly Brazilians: 2001 to 2016,
Abstract Background: Malignant skin melanoma is a serious public health problem, especially among the elderly population. Knowing the dynamics of the mortality rates of this disease in Brazil is essential to support the creation of public health policies. Objective: To analyze the temporal trend of mortality from malignant skin melanoma in elderly people i
An. Bras. Dermatol.. Publicado em: 2021-02
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8. Reaction-diffusion Model Applied to the Population Dynamics of Wild and Transgenic Mosquitoes
RESUMO Devido aos progressos recentes na manipulação genética, os mosquitos transgênicos podem ser uma alternativa viável para reduzir algumas doenças. Condições de viabilidade são obtidas pela simulação e análise de modelos matemáticos que descrevem o comportamento de populações de mosquitos selvagens e transgênicos convivendo em uma mesma �
TEMA (São Carlos). Publicado em: 2020-12
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9. Growth and yield of soybean cultivated in agroforestry systems
ABSTRACT Agriculture has caused numerous concerns regarding the preservation of natural resources. In this context, agroforestry systems are emerging as a more sustainable alternative. The present study aimed to evaluate growth characteristics, radiation use efficiency, biomass partition, and yield of soybean grown in two agroforestry systems and full sun. A
Rev. Ceres. Publicado em: 2020-06
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10. Uma perspectiva de comparação na escrita histórico-social do currículo do ensino secundário1 2
Resumo Neste trabalho, apresentamos parte de resultados de uma pesquisa que toma como fontes dissertações e teses sobre o ensino secundário no sul do Mato Grosso e de Minas Gerais, produzidas no Grupo de Estudos Observatório de Cultura Escolar (Universidade Federal de Mato Grosso do Sul) e no Centro de Pesquisa em História da Educação (Universidade Fe
Pro-Posições. Publicado em: 20/01/2020
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11. Population dynamics and description of larva and pupa of Cyclocephala tucumana Bréthes, 1904 in West-Central Brazil, and remarks on immatures of other Cyclocephala species (Coleoptera: Scarabaeidae: Dynastinae)
ABSTRACT Some species of Cyclocephala Dejean, 1821 (Coleoptera, Scarabaeidae, Dynastinae, Cyclocephalini) were reported as crop or pasture pests. Within this genus, Cyclocephla tucumana Bréthes, 1904 was noticed in cultivated areas in South Brazil, 2009 − 2010. Other study found larvae of the species associated with pastures in Aquidauana, Mato Grasso do
Rev. Bras. entomol.. Publicado em: 13/01/2020
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12. The population dynamics of three polyphagous owlet moths (Lepidoptera: Noctuidae) and the influence of meteorological factors and ENSO on them
ABSTRACT The owlet moths (Lepidoptera: Noctuidae) Anicla infecta (Ochsenheimer 1816), Elaphria agrotina (Guenée 1852) and Spodoptera frugiperda (J.E. Smith 1797) occur in the entire American continent. These polyphagous moths have a preference for grasses, and have different biological habits. In this study, the populations of these three species were evalu
Rev. Bras. entomol.. Publicado em: 13/01/2020