Mathematical
Mostrando 13-24 de 3834 artigos, teses e dissertações.
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13. A Genetic Algorithm for Pointwise Source Reconstruction by the Method of Fundamental Solutions
ABSTRACT Inverse source reconstruction problems offer great potential for applications of interest to engineering, such as the identification of polluting sources, and to medicine, such as electroencephalography, to cite at least two relevant examples. From a mathematical point of view, the identification of a concentrated source (intensity and location) cor
Trends in Computational and Applied Mathematics. Publicado em: 2022
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14. Comparative Study of Some Numerical Schemes for a Fractional Order Model of HIV Infection Treatment
ABSTRACT A fractional order mathematical model that already exists in the literature, was considered. This model was established to study the effects of medicinal treatment in people infected with the human immunodeficiency virus (HIV). The importance of this study is that the model evaluates, among other parameters, the density of healthy and HIV-infected C
Trends in Computational and Applied Mathematics. Publicado em: 2022
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15. A Nodal-iterative Technique for Criticality Calculations in Multigroup Neutron Diffusion Models
ABSTRACT In this work, a nodal and iterative technique to evaluate the effective multiplication factor as well as the neutron flux, in multigroup diffusion problems, is presented. An iterative scheme, similar to the source iteration method, is implemented to decouple the system of differential equations which is the fundamental mathematical model. Then, anal
Trends in Computational and Applied Mathematics. Publicado em: 2022
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16. CONSTRUCTION OF A MATHEMATICAL MODEL BASED ON A GENETIC ALGORITHM FOR AN APTITUDE PROGRAM IN HIGH SCHOOL STUDENT OPTIMIZATION
RESUMO Introdução: O algoritmo genético é um dos mais importantes modelos matemáticos teóricos para simulação de desenvolvimento biológico. É amplamente utilizado em muitos campos, tais como engenharia, medicina e economia. Objetivo: Utilizar o algoritmo genético como base de um modelo matemático para otimização no programa de aptidão nos es
Revista Brasileira de Medicina do Esporte. Publicado em: 2022
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17. Finite element computational development for thermo-mechanical analysis of plane steel structures exposed to fire
Abstract This article presents a numerical formulation based on finite element procedures for application in nonlinear thermo-mechanical analyses of steel planar structures under fire condition. The mechanical properties of structural elements degrade when subjected to high temperatures, resulting in significant reductions in strength and stiffness. Under th
REM - International Engineering Journal. Publicado em: 2022
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18. Numerical Simulations of the SEIR Epidemiological Model with Population Heterogeneity to Assess the Efficiency of Social Isolation in Controlling COVID-19 in Brazil
ABSTRACT On 30 January 2020, the World Health Organization (WHO) officially declared the epidemic of Coronavirus (COVID-19), which is a highly contagious virus that has been causing deaths worldwide. Early treatment was proven to be inefficient and social isolation became the main factor inhibiting the disease, before vaccination. In this article, we evaluat
Trends in Computational and Applied Mathematics. Publicado em: 2022
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19. Mathematical modeling and thermodynamic properties in the drying of citron watermelon seeds
RESUMO A melancia africana é um produto agrícola de excelente potencial econômico. Suas sementes são muito utilizadas para extração de óleo, servindo como fonte energética, demonstrando características nutricionais que a habilitam como produto a ser estudado. Assim, objetivou-se caracterizar quanto à composição físico-química, as sementes de me
Revista Brasileira de Engenharia Agrícola e Ambiental. Publicado em: 2022
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20. KINETICS AND MATHEMATICAL MODELING OF THE DRYING PROCESS OF MACAÚBA ALMONDS
RESUMO O estudo da cinética de secagem é fundamental para a correta escolha do tempo e da temperatura utilizadas no processo. Além disso, a modelagem matemática possibilita a simulação, a otimização, o dimensionamento e a determinação da aplicação comercial do sistema de secagem. Diante do exposto, objetivou-se investigar a cinética e a modelage
Revista Caatinga. Publicado em: 2022
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21. Analysis of Self-Regulated Learning at Each Level of Mathematical Creative Thinking Skill
Resumo A maioria dos indivíduos entende o pensamento criativo matemático não apenas como um fator cognitivo, mas também como um fator afetivo. A aprendizagem autorregulada (SRL) é considerada um fator afetivo que influencia a capacidade de pensamento criativo matemático. O objetivo deste estudo é determinar o efeito do SRL na capacidade de pensamento
Bolema: Boletim de Educação Matemática. Publicado em: 2022
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22. Association between Deep Subcutaneous Adipose Tissue Estimated by DAAT Index and Dietary Intake in Patients with Acute Coronary Syndrome
Abstract Background: Abdominal obesity has been associated with cardiovascular disease and may be modulated by dietary intake. The deep abdominal subcutaneous adipose tissue (dSAT) is a body fat compartment that can be estimated by using mathematical formulas. Objectives: To evaluate the association between dSAT estimated by the Deep-Abdominal-Adipose-Tiss
International Journal of Cardiovascular Sciences. Publicado em: 2022
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23. Perfil cientométrico da Quimiometria no Brasil
The interest of researchers in understanding the stage of development of specific areas of knowledge is a way to understand their scientific maturity and their capacity for consolidation. This “popularization” of the knowledge of researchers working in a specific area of knowledge also allows a greater ability to recognize where science is produced and w
Química Nova. Publicado em: 2022
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24. MATHEMATICAL MODELS FOR ESTIMATING METHANE PRODUCTION IN COVERED LAGOON BIODIGESTERS TREATING PIG MANURE
ABSTRACT Covered lagoon biodigesters (CLB) have been widespread in Brazil in the treatment of pig manure. However, the quantification of biogas production in CLB using mathematical models is still limited and scarce. This study aimed to evaluate and compare six mathematical models—Chen-Hashimoto (Chen, 1983), CETESB (2006), COD Conversion (Chernicharo, 201
Eng. Agríc.. Publicado em: 2021-08