Alessandro C Corrêa | IFPA (original) (raw)

Papers by Alessandro C Corrêa

Research paper thumbnail of Mechanical properties and statistical analysis of polyester composite reinforced with miriti fibers braided using crochet technique

Journal of Materials Research and Technology, Nov 30, 2023

This work presents an experimental investigation of the mechanical properties of composites reinf... more This work presents an experimental investigation of the mechanical properties of composites reinforced with crocheted fabrics of miriti fibers (Mauritia flexuosa) in a polyester matrix. The fabrics were manufactured under different grammages, with and without alkaline fiber treatment. The composites were produced using two different viscosity conditions of the polyester matrix and part of these underwent post-cure treatment at 60 °C. In order to evaluate the effects of the input variables, the samples were produced by manual lamination with curing under vacuum, following a complete factorial experimental matrix type 24, tested according to the ASTM D 3039. The results showed that the variables alkaline treatment of the fibers and viscosity of the matrix presented statistically significant effects on the responses limit of tensile strength and modulus of elasticity. The highest level of tensile strength (13.02 MPa) was obtained in composites with alkaline treatment of the fibers, fabric grammage 473.9 g/cm2, matrix with higher viscosity and post-cure application, while the modulus of elasticity obtained the best performance (1.59 GPa) in samples without alkaline treatment of the fibers, manufactured with the fabric of lower grammage, with a more viscous matrix and that underwent post-curing.

Research paper thumbnail of Use of Yarn and Carded Jute as Epoxy Matrix Reinforcement for the Production of Composite Materials for Application in the Wind Sector: A Preliminary Analysis for the Manufacture of Blades for Low-Intensity Winds

Research paper thumbnail of Mechanical properties and statistical analysis of polyester composite reinforced with miriti fibers braided using crochet technique

Journal of Materials Research and Technology, 2024

This work presents an experimental investigation of the mechanical properties of composites reinf... more This work presents an experimental investigation of the mechanical properties of composites reinforced with crocheted fabrics of miriti fibers (Mauritia flexuosa) in a polyester matrix. The fabrics were manufactured under different grammages, with and without alkaline fiber treatment. The composites were produced using two different viscosity conditions of the polyester matrix and part of these underwent post-cure treatment at 60 °C. In order to evaluate the effects of the input variables, the samples were produced by manual lamination with curing under vacuum, following a complete factorial experimental matrix type 24, tested according to the ASTM D 3039. The results showed that the variables alkaline treatment of the fibers and viscosity of the matrix presented statistically significant effects on the responses limit of tensile strength and modulus of elasticity. The highest level of tensile strength (13.02 MPa) was obtained in composites with alkaline treatment of the fibers, fabric grammage 473.9 g/cm2, matrix with higher viscosity and post-cure application, while the modulus of elasticity obtained the best performance (1.59 GPa) in samples without alkaline treatment of the fibers, manufactured with the fabric of lower grammage, with a more viscous matrix and that underwent post-curing.

Research paper thumbnail of Análise da variação de eficiência dos Institutos de Educação, Ciência e Tecnologia Efficiency variation analysis of the Institutes of Education, Science and Technology

Revista de Gestão e Secretariado, 2023

Este estudo analisou a variação da eficiência dos Institutos da Rede Federal de Educação, Ciência... more Este estudo analisou a variação da eficiência dos Institutos da Rede Federal de Educação, Ciência e Tecnologia no período de 2014 a 2016. Adotou-se o Modelo DEA-Malmquist com retornos variáveis de escala orientado ao produto por ser capaz de realizar a análise dinâmica da eficiência técnica. Os dados das 38 instituições foram coletados nos relatórios de gestão

Research paper thumbnail of Use of yarn and carded jute as epoxy matrix reinforcement for the production of composite materials for application in the wind sector: a preliminary analysis for the manufacture of blades for low intensity winds

Polymers, 2023

The development of wind turbines for regions with low wind speeds imposes a challenge to the expa... more The development of wind turbines for regions with low wind speeds imposes a challenge to the expansion of the corresponding energy generation capacity. The present work consists of an evaluation of the potential carded jute fiber and jute yarn to be used in the construction of a wind blade for regions of low wind intensity. The fibers used were supplied by Company Textile of Castanhal (Castanhal-Para-Brazil) and used in the study without chemical treatment in the form of single-filament fibers and yarns with a surface twist of 18.5°. The composites were produced through the resin infusion technique and underwent tensile and shear tests using 120-Ohm strain gauges and a blade extensometer to obtain the Young’s modulus. In the analysis of the results, the ANOVA test was applied with a 0.05 significance level, followed by Tukey’s test. The results showed that long, aligned jute fibers can be a good option for laminated structures applied in composites for small wind turbine blades.

Research paper thumbnail of Valor econômico gerado por instituições públicas: avaliação do IFPA Campus Abaetetuba

Contabilidade Vista Revista, Apr 26, 2013

Research paper thumbnail of Avaliação de desempenho baseado em valor: aplicação a uma unidade administrativa do IFPA

Research paper thumbnail of Conditional Volatility in the Brazilian Mutual Funds

efmaefm.org

Alessandro de Castro Corrêa Assistant Professor University of Amazônia Av. Alcindo Cacela, 287 66... more Alessandro de Castro Corrêa Assistant Professor University of Amazônia Av. Alcindo Cacela, 287 66060-902 Belém - Pará Brasil acorrea@unama.br ... Carlos Machado-Santos Associate Professor UTAD University Department of Economics & Management Apartado ...

Research paper thumbnail of Serviços Médico-Hospitalares: Fatores De Satisfação Dos Pacientes De Um Hospital Público De Belém-Pa Medical Service-Hospital: Factors of Satisfaction of Patients of a Public Hospital of Belém, Pa

The aim of this study was to identify the factors associated with patient satisfaction of a publi... more The aim of this study was to identify the factors associated with patient satisfaction of a public hospital in the metropolitan area of Belem, State of Para. The sample was constituted by 400 interviews, in the period from September 1 st to 15 th , 2008. The issue of the focus on patient satisfaction is in the context of New Public Management. The statistic analysis was based on factor analysis technique. The results suggest that medical staff, reception, care services and infrastructure are the factors associated with patient satisfaction, as well the importance of interpersonal relationship was revealed.

Research paper thumbnail of Engrenagem Clima

Engrenagem, 2018

O objetivo deste estudo foi analisar o clima organizacional no Campus Belém do Instituto Federal ... more O objetivo deste estudo foi analisar o clima organizacional no Campus Belém do Instituto Federal de Educação, Ciência e Tecnologia do Pará (IFPA – Campus Belém). A amostra foi constituída por 40 servidores técnico-administrativos em 2014 por meio do questionário de Escala de Clima Organizacional proposto por Martins et al. (2004 ). Os resultados revelaram um baixo clima organizacional e a presença de tendência de respostas em algumas questões. As suas principais constatações estão em linhas com outras investigações recentes na administração pública brasileira, com destaque para a baixa percepção de que os esforços para a melhoria da qualidade e produtividade sejam reconhecidos e resultem em recompensas e a baixa participação no processo de tomada de decisão

Research paper thumbnail of Comparison of Young’s Modulus of Continuous and Aligned Lignocellulosic Jute and Mallow Fibers Reinforced Polyester Composites Determined Both Experimentally and from Theoretical Prediction Models

Polymers

Mechanical properties of composites reinforced with lignocellulosic fibers have been researched i... more Mechanical properties of composites reinforced with lignocellulosic fibers have been researched in recent decades. Jute and mallow fibers are reinforcement alternatives, as they can contribute to increase the mechanical strength of composite materials. The present work aims to predict the Young’s modulus with application of continuous and aligned lignocellulosic fibers to be applied as reinforcement in polyester matrix. Fibers were manually separated and then arranged and aligned in the polyester matrix. Composites with addition 5, 15, and 25 vol% jute and mallow fibers were produced by vacuum-assisted hand lay-up/vaccum-bagging procedure. Samples were tested in tensile and the tensile strength, elasticity modulus, and deformation were determined. Results showed that the intrinsic Young’s modulus of the fibers was set at values around 17.95 and 11.72 GPa for jute and mallow fibers, respectively. Statistical analysis showed that composites reinforced with 15 and 25 vol% jute and mall...

Research paper thumbnail of Properties of flexural and impact of matrix composites polyester reinforced with short lignocellulosic fibers

Research, Society and Development, 2022

Composite materials stand out for enabling the development of new materials that are environmenta... more Composite materials stand out for enabling the development of new materials that are environmentally friendly, whose manufacturing processes and waste are increasingly less harmful, associated with good mechanical properties. In this context, this work sought to investigate the mechanical behavior in flexural and impact of polyester matrix composites with the inclusion of short fibers of sisal, piassava, raffia, mallow and jute arranged randomly. The mechanical properties of flexural were evaluated according to ASTM D 790 and the impact toughness Charpy with the ASTM D 6110 standard. The results showed that when subjected to flexural stresses, the composites presented resistance of 112 .12 MPa for the neat matrix and 35.21; 34.45; 27.29; 25.89 and 20.56 MPa with the inclusion of sisal, piassava, raffia, mallow and jute fibers, respectively. As for the impact test, they showed values of 31.50 kJ/m² for the neat matrix and 57.06; 52.52; 48.03; 38.02; 37.65 kJ/m² with the inclusion of ...

Research paper thumbnail of Comparison of Young's Modulus of Continuous and Aligned Lignocellulosic Jute and Mallow Fibers Reinforced Polyester Composites Determined Both Experimentally and from Theoretical Prediction Models

Polymers, 2022

Mechanical properties of composites reinforced with lignocellulosic fibers have been researched i... more Mechanical properties of composites reinforced with lignocellulosic fibers have been researched in recent decades. Jute and mallow fibers are reinforcement alternatives, as they can contribute to increase the techanical strength of composite materials. The present work aims to
predict the Young’s modulus with application of continuous and aligned lignocellulosic fibers to be applied as reinforcement in polyester matrix. Fibers were manually separated and then arranged and aligned in the polyester matrix. Composites with addition 5, 15, and 25 vol% jute and mallow fibers were produced by vacuum-assisted hand lay-up/vaccum-bagging procedure. Samples were tested in tensile and the tensile strength, elasticity modulus, and deformation were determined. Results
showed that the intrinsic Young’s modulus of the fibers was set at values around 17.95 and 11.72 GPa for jute and mallow fibers, respectively. Statistical analysis showed that composites reinforced with 15 and 25 vol% jute and mallow presented the highest values of tensile strength and Young’s modulus. The incorporation of 25 vol% of jute and mallow fibers increased the matrix Young’s modulus by 534% and 353%, respectively, effectively stiffening the composite material. Prediction models presented similar values for the Young’s modulus, showing that jute and mallow fibers might be used as potential reinforcement of polymeric matrices

Research paper thumbnail of Properties of flexural and impact of matrix composites polyester reinforced with short lignocellulosic fibers

Research, Society and Development, 2022

Properties of flexural and impact of matrix composites polyester reinforced with short lignocellu... more Properties of flexural and impact of matrix composites polyester reinforced with short lignocellulosic fibers Propriedades de flexão e impacto de compósitos de matriz poliéster reforçados com fibras lignocelulósicas curtas Propiedades de flexión e impacto de compuestos de matriz de poliéster reforzados con fibras lignocelulósicas cortas

Research paper thumbnail of As Características Dos Institutos Federais No Ano De 2016

Investigação Científica nas Ciências Humanas e Sociais Aplicadas 3, 2019

O objetivo deste trabalho foi analisar as características dos Institutos da Rede Federal de Educa... more O objetivo deste trabalho foi analisar as características dos Institutos da Rede Federal de Educação, Ciência e Tecnologia (IF). A análise descritiva envolveu todos os 38 IF em 2016, sendo analisadas as variáveis Vagas, Matriculados, Inscritos, Concluintes, Docentes, Titulação do Corpo Docente (TCD), Campi, Gastos Correntes (GC), Gasto Com Pessoal (GP), Gastos Com Outros Custeios (GO), Gasto Com Investimentos (GI) e Índice De Governança De Pessoas (iGovPessoas), estas extraídas do Relatório Anual de Análise dos Indicadores de Gestão das Instituições Federais de Educação Profissional, Científica e Tecnológica, disponível no sítio do Tribunal de Contas da União (TCU) e as estatísticas descritivas foram calculadas com o auxílio do software R. Os resultados revelaram que, em média, os IF possuem 21.612 alunos matriculados, disponibilizaram 7.385 vagas, formaram 2.653 alunos, possuem 863 docentes com titulação do corpo docente próxima ao mestrado (3,8), com gastos correntes de 280 milhões, baixo índice de Governança de Pessoas e que as regiões Nordeste e Sudeste possuem a maior quantidade de campi

Research paper thumbnail of Utilização Do Ambiente R Na Assistência Ao Método De Superfície De Resposta Para Modelagem e Otimização Da Secagem De Sementes De Urucum

Engenharia de Produtos Naturais: planejamento, experimentação, obtenção de produtos e purificação, 2021

Research paper thumbnail of A LEI DE ACESSO À INFORMAÇÃO EM INSTITUIÇÕES FEDERAIS DE ENSINO SUPERIOR: Uma Investigação na Cultura Organizacional da Universidade Federal Rural da Amazônia

O objetivo deste estudo foi analisar, sob a perspectiva dos servidores publicos, os principais as... more O objetivo deste estudo foi analisar, sob a perspectiva dos servidores publicos, os principais aspectos da cultura organizacional, que podem influenciar o atendimento da Lei 12.527, de 18 de novembro de 2011, conhecida como Lei de Acesso a Informacao. Para tanto, foi feita uma pesquisa quantitativa, de alcance exploratorio e descritivo do tipo transversal, com 178 servidores publicos da Universidade Federal Rural da Amazonia, selecionados por amostragem probabilistica aleatoria simples. O tratamento de dados utilizou tecnicas descritivas, inferenciais e multivariadas, em especial a analise fatorial exploratoria (AFE) e a analise de agrupamentos (AA). Os resultados revelaram quatro fatores, que explicaram 69,73% da variância dos dados e foram denominados como: legitimidade da administracao publica (22,64%), utilizacao indevida da informacao publica (20,29%), dominio social da informacao (14,50%) e poder e controle do servidor publico (12,30%). A analise de agrupamentos mostrou a pres...

Research paper thumbnail of Análise envoltória de dados com apoio do software R: uma aplicação nos Institutos Federais

O objetivo deste artigo e apresentar o Software R como uma promissora ferramenta no apoio de apli... more O objetivo deste artigo e apresentar o Software R como uma promissora ferramenta no apoio de aplicacoes da Analise Envoltoria de Dados (DEA), um metodo multicriterio de analise de eficiencia relativa de organizacoes. Analisaram-se 38 Institutos da Rede Federal de Educacao, Ciencia e Tecnologia (IF) por meio da DEA com rendimentos variaveis de escala (RCE) orientado a produto, no ano de 2014, utilizando–se indicadores de gestao, dois de insumo e um de produto. O estudo foi inteiramente realizado no R, realizando-se calculos de eficiencia tecnica, supereficiencia, coeficientes de correlacao, regressao multipla, transformacao de dados e geracao de graficos personalizados. Os resultados, alem de revelar o desempenho dos Institutos, evidenciaram o software R como uma vantajosa opcao para aplicacao da DEA, ressaltando a sua simplicidade e versatilidade.

Research paper thumbnail of Aplicação do TOPSIS na análise do processo de infusão a vácuo para fabricação de compósitos com fios de juta

Research paper thumbnail of Seleção de material para ponteiras de bengalas de deficientes visuais com apoio do método TOPSIS

Research paper thumbnail of Mechanical properties and statistical analysis of polyester composite reinforced with miriti fibers braided using crochet technique

Journal of Materials Research and Technology, Nov 30, 2023

This work presents an experimental investigation of the mechanical properties of composites reinf... more This work presents an experimental investigation of the mechanical properties of composites reinforced with crocheted fabrics of miriti fibers (Mauritia flexuosa) in a polyester matrix. The fabrics were manufactured under different grammages, with and without alkaline fiber treatment. The composites were produced using two different viscosity conditions of the polyester matrix and part of these underwent post-cure treatment at 60 °C. In order to evaluate the effects of the input variables, the samples were produced by manual lamination with curing under vacuum, following a complete factorial experimental matrix type 24, tested according to the ASTM D 3039. The results showed that the variables alkaline treatment of the fibers and viscosity of the matrix presented statistically significant effects on the responses limit of tensile strength and modulus of elasticity. The highest level of tensile strength (13.02 MPa) was obtained in composites with alkaline treatment of the fibers, fabric grammage 473.9 g/cm2, matrix with higher viscosity and post-cure application, while the modulus of elasticity obtained the best performance (1.59 GPa) in samples without alkaline treatment of the fibers, manufactured with the fabric of lower grammage, with a more viscous matrix and that underwent post-curing.

Research paper thumbnail of Use of Yarn and Carded Jute as Epoxy Matrix Reinforcement for the Production of Composite Materials for Application in the Wind Sector: A Preliminary Analysis for the Manufacture of Blades for Low-Intensity Winds

Research paper thumbnail of Mechanical properties and statistical analysis of polyester composite reinforced with miriti fibers braided using crochet technique

Journal of Materials Research and Technology, 2024

This work presents an experimental investigation of the mechanical properties of composites reinf... more This work presents an experimental investigation of the mechanical properties of composites reinforced with crocheted fabrics of miriti fibers (Mauritia flexuosa) in a polyester matrix. The fabrics were manufactured under different grammages, with and without alkaline fiber treatment. The composites were produced using two different viscosity conditions of the polyester matrix and part of these underwent post-cure treatment at 60 °C. In order to evaluate the effects of the input variables, the samples were produced by manual lamination with curing under vacuum, following a complete factorial experimental matrix type 24, tested according to the ASTM D 3039. The results showed that the variables alkaline treatment of the fibers and viscosity of the matrix presented statistically significant effects on the responses limit of tensile strength and modulus of elasticity. The highest level of tensile strength (13.02 MPa) was obtained in composites with alkaline treatment of the fibers, fabric grammage 473.9 g/cm2, matrix with higher viscosity and post-cure application, while the modulus of elasticity obtained the best performance (1.59 GPa) in samples without alkaline treatment of the fibers, manufactured with the fabric of lower grammage, with a more viscous matrix and that underwent post-curing.

Research paper thumbnail of Análise da variação de eficiência dos Institutos de Educação, Ciência e Tecnologia Efficiency variation analysis of the Institutes of Education, Science and Technology

Revista de Gestão e Secretariado, 2023

Este estudo analisou a variação da eficiência dos Institutos da Rede Federal de Educação, Ciência... more Este estudo analisou a variação da eficiência dos Institutos da Rede Federal de Educação, Ciência e Tecnologia no período de 2014 a 2016. Adotou-se o Modelo DEA-Malmquist com retornos variáveis de escala orientado ao produto por ser capaz de realizar a análise dinâmica da eficiência técnica. Os dados das 38 instituições foram coletados nos relatórios de gestão

Research paper thumbnail of Use of yarn and carded jute as epoxy matrix reinforcement for the production of composite materials for application in the wind sector: a preliminary analysis for the manufacture of blades for low intensity winds

Polymers, 2023

The development of wind turbines for regions with low wind speeds imposes a challenge to the expa... more The development of wind turbines for regions with low wind speeds imposes a challenge to the expansion of the corresponding energy generation capacity. The present work consists of an evaluation of the potential carded jute fiber and jute yarn to be used in the construction of a wind blade for regions of low wind intensity. The fibers used were supplied by Company Textile of Castanhal (Castanhal-Para-Brazil) and used in the study without chemical treatment in the form of single-filament fibers and yarns with a surface twist of 18.5°. The composites were produced through the resin infusion technique and underwent tensile and shear tests using 120-Ohm strain gauges and a blade extensometer to obtain the Young’s modulus. In the analysis of the results, the ANOVA test was applied with a 0.05 significance level, followed by Tukey’s test. The results showed that long, aligned jute fibers can be a good option for laminated structures applied in composites for small wind turbine blades.

Research paper thumbnail of Valor econômico gerado por instituições públicas: avaliação do IFPA Campus Abaetetuba

Contabilidade Vista Revista, Apr 26, 2013

Research paper thumbnail of Avaliação de desempenho baseado em valor: aplicação a uma unidade administrativa do IFPA

Research paper thumbnail of Conditional Volatility in the Brazilian Mutual Funds

efmaefm.org

Alessandro de Castro Corrêa Assistant Professor University of Amazônia Av. Alcindo Cacela, 287 66... more Alessandro de Castro Corrêa Assistant Professor University of Amazônia Av. Alcindo Cacela, 287 66060-902 Belém - Pará Brasil acorrea@unama.br ... Carlos Machado-Santos Associate Professor UTAD University Department of Economics & Management Apartado ...

Research paper thumbnail of Serviços Médico-Hospitalares: Fatores De Satisfação Dos Pacientes De Um Hospital Público De Belém-Pa Medical Service-Hospital: Factors of Satisfaction of Patients of a Public Hospital of Belém, Pa

The aim of this study was to identify the factors associated with patient satisfaction of a publi... more The aim of this study was to identify the factors associated with patient satisfaction of a public hospital in the metropolitan area of Belem, State of Para. The sample was constituted by 400 interviews, in the period from September 1 st to 15 th , 2008. The issue of the focus on patient satisfaction is in the context of New Public Management. The statistic analysis was based on factor analysis technique. The results suggest that medical staff, reception, care services and infrastructure are the factors associated with patient satisfaction, as well the importance of interpersonal relationship was revealed.

Research paper thumbnail of Engrenagem Clima

Engrenagem, 2018

O objetivo deste estudo foi analisar o clima organizacional no Campus Belém do Instituto Federal ... more O objetivo deste estudo foi analisar o clima organizacional no Campus Belém do Instituto Federal de Educação, Ciência e Tecnologia do Pará (IFPA – Campus Belém). A amostra foi constituída por 40 servidores técnico-administrativos em 2014 por meio do questionário de Escala de Clima Organizacional proposto por Martins et al. (2004 ). Os resultados revelaram um baixo clima organizacional e a presença de tendência de respostas em algumas questões. As suas principais constatações estão em linhas com outras investigações recentes na administração pública brasileira, com destaque para a baixa percepção de que os esforços para a melhoria da qualidade e produtividade sejam reconhecidos e resultem em recompensas e a baixa participação no processo de tomada de decisão

Research paper thumbnail of Comparison of Young’s Modulus of Continuous and Aligned Lignocellulosic Jute and Mallow Fibers Reinforced Polyester Composites Determined Both Experimentally and from Theoretical Prediction Models

Polymers

Mechanical properties of composites reinforced with lignocellulosic fibers have been researched i... more Mechanical properties of composites reinforced with lignocellulosic fibers have been researched in recent decades. Jute and mallow fibers are reinforcement alternatives, as they can contribute to increase the mechanical strength of composite materials. The present work aims to predict the Young’s modulus with application of continuous and aligned lignocellulosic fibers to be applied as reinforcement in polyester matrix. Fibers were manually separated and then arranged and aligned in the polyester matrix. Composites with addition 5, 15, and 25 vol% jute and mallow fibers were produced by vacuum-assisted hand lay-up/vaccum-bagging procedure. Samples were tested in tensile and the tensile strength, elasticity modulus, and deformation were determined. Results showed that the intrinsic Young’s modulus of the fibers was set at values around 17.95 and 11.72 GPa for jute and mallow fibers, respectively. Statistical analysis showed that composites reinforced with 15 and 25 vol% jute and mall...

Research paper thumbnail of Properties of flexural and impact of matrix composites polyester reinforced with short lignocellulosic fibers

Research, Society and Development, 2022

Composite materials stand out for enabling the development of new materials that are environmenta... more Composite materials stand out for enabling the development of new materials that are environmentally friendly, whose manufacturing processes and waste are increasingly less harmful, associated with good mechanical properties. In this context, this work sought to investigate the mechanical behavior in flexural and impact of polyester matrix composites with the inclusion of short fibers of sisal, piassava, raffia, mallow and jute arranged randomly. The mechanical properties of flexural were evaluated according to ASTM D 790 and the impact toughness Charpy with the ASTM D 6110 standard. The results showed that when subjected to flexural stresses, the composites presented resistance of 112 .12 MPa for the neat matrix and 35.21; 34.45; 27.29; 25.89 and 20.56 MPa with the inclusion of sisal, piassava, raffia, mallow and jute fibers, respectively. As for the impact test, they showed values of 31.50 kJ/m² for the neat matrix and 57.06; 52.52; 48.03; 38.02; 37.65 kJ/m² with the inclusion of ...

Research paper thumbnail of Comparison of Young's Modulus of Continuous and Aligned Lignocellulosic Jute and Mallow Fibers Reinforced Polyester Composites Determined Both Experimentally and from Theoretical Prediction Models

Polymers, 2022

Mechanical properties of composites reinforced with lignocellulosic fibers have been researched i... more Mechanical properties of composites reinforced with lignocellulosic fibers have been researched in recent decades. Jute and mallow fibers are reinforcement alternatives, as they can contribute to increase the techanical strength of composite materials. The present work aims to
predict the Young’s modulus with application of continuous and aligned lignocellulosic fibers to be applied as reinforcement in polyester matrix. Fibers were manually separated and then arranged and aligned in the polyester matrix. Composites with addition 5, 15, and 25 vol% jute and mallow fibers were produced by vacuum-assisted hand lay-up/vaccum-bagging procedure. Samples were tested in tensile and the tensile strength, elasticity modulus, and deformation were determined. Results
showed that the intrinsic Young’s modulus of the fibers was set at values around 17.95 and 11.72 GPa for jute and mallow fibers, respectively. Statistical analysis showed that composites reinforced with 15 and 25 vol% jute and mallow presented the highest values of tensile strength and Young’s modulus. The incorporation of 25 vol% of jute and mallow fibers increased the matrix Young’s modulus by 534% and 353%, respectively, effectively stiffening the composite material. Prediction models presented similar values for the Young’s modulus, showing that jute and mallow fibers might be used as potential reinforcement of polymeric matrices

Research paper thumbnail of Properties of flexural and impact of matrix composites polyester reinforced with short lignocellulosic fibers

Research, Society and Development, 2022

Properties of flexural and impact of matrix composites polyester reinforced with short lignocellu... more Properties of flexural and impact of matrix composites polyester reinforced with short lignocellulosic fibers Propriedades de flexão e impacto de compósitos de matriz poliéster reforçados com fibras lignocelulósicas curtas Propiedades de flexión e impacto de compuestos de matriz de poliéster reforzados con fibras lignocelulósicas cortas

Research paper thumbnail of As Características Dos Institutos Federais No Ano De 2016

Investigação Científica nas Ciências Humanas e Sociais Aplicadas 3, 2019

O objetivo deste trabalho foi analisar as características dos Institutos da Rede Federal de Educa... more O objetivo deste trabalho foi analisar as características dos Institutos da Rede Federal de Educação, Ciência e Tecnologia (IF). A análise descritiva envolveu todos os 38 IF em 2016, sendo analisadas as variáveis Vagas, Matriculados, Inscritos, Concluintes, Docentes, Titulação do Corpo Docente (TCD), Campi, Gastos Correntes (GC), Gasto Com Pessoal (GP), Gastos Com Outros Custeios (GO), Gasto Com Investimentos (GI) e Índice De Governança De Pessoas (iGovPessoas), estas extraídas do Relatório Anual de Análise dos Indicadores de Gestão das Instituições Federais de Educação Profissional, Científica e Tecnológica, disponível no sítio do Tribunal de Contas da União (TCU) e as estatísticas descritivas foram calculadas com o auxílio do software R. Os resultados revelaram que, em média, os IF possuem 21.612 alunos matriculados, disponibilizaram 7.385 vagas, formaram 2.653 alunos, possuem 863 docentes com titulação do corpo docente próxima ao mestrado (3,8), com gastos correntes de 280 milhões, baixo índice de Governança de Pessoas e que as regiões Nordeste e Sudeste possuem a maior quantidade de campi

Research paper thumbnail of Utilização Do Ambiente R Na Assistência Ao Método De Superfície De Resposta Para Modelagem e Otimização Da Secagem De Sementes De Urucum

Engenharia de Produtos Naturais: planejamento, experimentação, obtenção de produtos e purificação, 2021

Research paper thumbnail of A LEI DE ACESSO À INFORMAÇÃO EM INSTITUIÇÕES FEDERAIS DE ENSINO SUPERIOR: Uma Investigação na Cultura Organizacional da Universidade Federal Rural da Amazônia

O objetivo deste estudo foi analisar, sob a perspectiva dos servidores publicos, os principais as... more O objetivo deste estudo foi analisar, sob a perspectiva dos servidores publicos, os principais aspectos da cultura organizacional, que podem influenciar o atendimento da Lei 12.527, de 18 de novembro de 2011, conhecida como Lei de Acesso a Informacao. Para tanto, foi feita uma pesquisa quantitativa, de alcance exploratorio e descritivo do tipo transversal, com 178 servidores publicos da Universidade Federal Rural da Amazonia, selecionados por amostragem probabilistica aleatoria simples. O tratamento de dados utilizou tecnicas descritivas, inferenciais e multivariadas, em especial a analise fatorial exploratoria (AFE) e a analise de agrupamentos (AA). Os resultados revelaram quatro fatores, que explicaram 69,73% da variância dos dados e foram denominados como: legitimidade da administracao publica (22,64%), utilizacao indevida da informacao publica (20,29%), dominio social da informacao (14,50%) e poder e controle do servidor publico (12,30%). A analise de agrupamentos mostrou a pres...

Research paper thumbnail of Análise envoltória de dados com apoio do software R: uma aplicação nos Institutos Federais

O objetivo deste artigo e apresentar o Software R como uma promissora ferramenta no apoio de apli... more O objetivo deste artigo e apresentar o Software R como uma promissora ferramenta no apoio de aplicacoes da Analise Envoltoria de Dados (DEA), um metodo multicriterio de analise de eficiencia relativa de organizacoes. Analisaram-se 38 Institutos da Rede Federal de Educacao, Ciencia e Tecnologia (IF) por meio da DEA com rendimentos variaveis de escala (RCE) orientado a produto, no ano de 2014, utilizando–se indicadores de gestao, dois de insumo e um de produto. O estudo foi inteiramente realizado no R, realizando-se calculos de eficiencia tecnica, supereficiencia, coeficientes de correlacao, regressao multipla, transformacao de dados e geracao de graficos personalizados. Os resultados, alem de revelar o desempenho dos Institutos, evidenciaram o software R como uma vantajosa opcao para aplicacao da DEA, ressaltando a sua simplicidade e versatilidade.

Research paper thumbnail of Aplicação do TOPSIS na análise do processo de infusão a vácuo para fabricação de compósitos com fios de juta

Research paper thumbnail of Seleção de material para ponteiras de bengalas de deficientes visuais com apoio do método TOPSIS

Research paper thumbnail of AS CARACTERÍSTICAS DOS INSTITUTOS FEDERAIS NO ANO DE 2016

Investigação Científica nas Ciências Humanas e Sociais Aplicadas, 2019

O objetivo deste trabalho foi analisar as características dos Institutos da Rede Federal de Educa... more O objetivo deste trabalho foi analisar as características dos Institutos da Rede Federal de Educação, Ciência e Tecnologia (IF). A análise descritiva envolveu todos os 38 IF em 2016, sendo analisadas as variáveis Vagas, Matriculados, Inscritos, Concluintes, Docentes, Titulação do Corpo Docente (TCD), Campi, Gastos Correntes (GC), Gasto Com Pessoal (GP), Gastos Com Outros Custeios (GO), Gasto Com Investimentos (GI) e Índice De Governança De Pessoas (iGovPessoas), estas extraídas do Relatório Anual de Análise dos Indicadores de Gestão das Instituições Federais de Educação Profissional, Científica e Tecnológica, disponível no sítio do Tribunal de Contas da União (TCU) e as estatísticas descritivas foram calculadas com o auxílio do software R. Os resultados revelaram que, em média, os IF possuem 21.612 alunos matriculados, disponibilizaram 7.385 vagas, formaram 2.653 alunos, possuem 863 docentes com titulação do corpo docente próxima ao mestrado (3,8), com gastos correntes de 280 milhões, baixo índice de Governança de Pessoas e que as regiões Nordeste e Sudeste possuem a maior quantidade de campi.