Publicações - engenharias
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Marienne do Rocio de Mello Maron da Costa;
Maria Clara Cavalini Pinto;
Eliziane Jubanski Martins;
Sarah Lopes Tamura;
Paula Aguilar Guimarães
Palavra-chave:
argamassa autonivelante;
aditivos
Áreas do conhecimento:
Engenharias; Engenharia Civil; Construção Civil; Tecnologia da Informação na Construção Civil
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MARCELINO DOS SANTOS, LORENA;
FEDALTO SARTORI, LUCAS;
Luiz Fernando L Lima Jr;
PEDERSEN VOLL, FERNANDO AUGUSTO
Palavra-chave:
Discrete element method (DEM);
PARTICLES;
Rotating drum;
friction coefficients;
granulated sugar
Áreas do conhecimento:
Engenharias; Engenharia Química; Bioprocessos;
Engenharias; Engenharia Química; Operações Industriais e Equipamentos para Engenharia Química
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DE SIQUEIRA NASCIMENTO, AHRYMAN SEIXAS BUSSE;
MACHADO, JOÃO PAULO ZOMER;
LEANDRO DOS SANTOS COELHO;
FLESCH, RODOLFO CÉSAR COSTA
INTERNATIONAL JOURNAL OF REFRIGERATION-REVUE INTERNATIONALE DU FROID,
v. 168,
p. 288-296,
2024
DOI
Home page
Palavra-chave:
Aprendizado de Maquina;
métodos de regressão;
Refrigeração
Áreas do conhecimento:
Engenharias; Engenharia Elétrica; Inteligência Artificial;
Engenharias; Engenharia Elétrica; aprendizado de máquina
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José João de Espíndola;
DE ALMEIDA PRADO, BRUNO FERRARI;
José João de Espíndola
Palavra-chave:
Optimization;
Rotordynamic;
Vibration Control in a Frequency Range;
Viscoelastic Support
Áreas do conhecimento:
Engenharias; Mecânica dos Sólidos; Vibrações
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Viscoelastic supports (VES) are bearing-foundation systems containing viscoelastic materials with high capacity of vibration energy dissipation. The application of VES on rotating machinery allows for a safe operation around critical speeds while suppressing peaks of vibration amplification. This paper presents an experimental validation of a multi-degree-of-freedom (multi-DOF) VES independently designed with regards to viscoelastic stiffness in translational and rotational DOF. An optimal design of the multi-DOF VES is obtained using a methodology developed in previous works and a prototype is constructed and integrated into the rotating system to be experimentally validated. Run-down measurements were carried out and compared with the frequency unbalance response numerical predictions. The run-down measurements exhibit excellent agreement with numerical predictions, particularly in terms of frequency accuracy. These results highlight the effectiveness of the optimally designed multi-DOF VES in controlling the unbalance frequency response over the entire spin speed range of a dual-disc rotating system. This leads to a significant reduction in response amplitude at critical speed when compared to the rotating system supported on rigid bearings. The experimental validation of the multi-DOF VES demonstrates its capability to enhance the performance and safety of rotating machinery operating around critical speeds. The optimized design effectively mitigates response amplitudes at critical speeds, validating the methodology presented in previous works. The findings underscore the practical applicability of the proposed approach, positioning the multi-DOF VES as a valuable tool for controlling the unbalance frequency response in rotating systems.
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Enembreck, Flávia Luisa Pires;
Maria do Carmo Duarte Freitas;
BRAGANÇA, LUÍS
Palavra-chave:
Agile Methodologies;
construction projects;
Project Management Office;
Scrum
Áreas do conhecimento:
Engenharias; Engenharia Civil; Construção Civil; Tecnologia da Informação na Construção Civil;
Engenharias; Engenharia Civil; Inovação;
Engenharias; Engenharia de Produção; Gestão da Informação
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FERNANDES, IDONILTON DA CONCEIÇÃO;
SANTOS, B. W;
isadora dalarmi miguel;
Cintia Aparecida dos Anjos;
DALARMI, LUCIANE;
MONTRUCCHIO, DEISE PREHS;
DE FÁTIMA GASPARI DIAS, JOSIANE;
MIGUEL, MARILIS DALLARMI;
MIGUEL, OBDULIO GOMES
Revista Científica da FAMINAS,
v. 19,
n. 1,
p. 112-128,
2024
Áreas do conhecimento:
Engenharias; Engenharia Química; Tecnologia Química; Produtos Naturais
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SIGNORI-IAMIN, GIOVANA;
AGUADO, ROBERTO J.;
TARRÉS, QUIM;
Alexandre Ferreira Santos;
DELGADO-AGUILAR, MARC
Palavra-chave:
nanocelulose;
Ciclo do CO2;
Estabilidade
Áreas do conhecimento:
Engenharias; Processos Industriais de Engenharia Química; Processos Biotecnológicos;
Engenharias; Engenharia Química; Operações Industriais e Equipamentos para Engenharia Química
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While cationic cellulose has yet to find a place in the paper industry, manufacturers show certain interest in a more recent material: cellulose nanofibers (CNFs), generally with negative surface charge. This work suggests both to be combined to increase the mechanical properties of recycled paper while preventing the use of synthetic polyelectrolytes as retention agents. On one hand, a bleached pulp was cationized by etherification, both as-is and following mechanical refining (15,000 PFI revolutions) and submitted to high-pressure homogenization, generating two different kinds of cationic CNFs. On the other, the same pulp was submitted to an enzymatic pretreatment and high-pressure homogenization, producing a negatively charged cellulose micro/nanofiber (CMNF). Two different cellulose-based systems consisting of each type of cationic CNF and the enzymatic CMNF were applied in the papermaking of both virgin and recycled paper. This study demonstrates the effective use of the cationic CNFs as retention agents during sheet formation, which together with the enzymatic CMNFs significantly enhanced the mechanical properties of both types of paper. The study found that refining before cationization favored the retention effect, primarily due to increased surface area and charge of the cationic CNFs, where remarkable increases in the breaking length of virgin (125.1%) and recycled paper (46.5%) were reached. The synergy between cationic CNFs and enzymatic CMNFs outperformed the use of commercial polyacrylamide, a non-biodegradable polyelectrolyte. This research highlights the potential of tailored CNFs in producing high-performance papers, while promoting sustainability and offering a plausible strategy to increase paper recycling rates.
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Bianca Marinho da Silva;
ALVES, CARLOS AUGUSTO DA SILVA;
CORRÊA, DENILSON LUAN OLIVEIRA;
Michele Rigon Spier;
ALENCAR, LAYS DE ANDRADE;
DA SILVA, RAIMUNDO NONATO
Palavra-chave:
Amazon Fibers, Sustentabilidade, Economia Circular
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SAPUCAIA DA SILVA JUNIOR, ELIVALDO;
FONTANA, ÉLITON;
Luiz Fernando L Lima Jr
Palavra-chave:
Ergun?s equation;
Heterogeneous porous medium;
permeability;
Porosity;
Pseudohomogeneous porous medium
Áreas do conhecimento:
Engenharias; Engenharia Química; Bioprocessos
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DOS SANTOS PERIN, ELONI;
SAVIONE MACHADO, NATHALIA;
Maria do Carmo Duarte Freitas
Palavra-chave:
Alfabetización digital;
formação docente baasada en competencia;
educación continua;
Tecnologia educativa.;
Educación primaria
Áreas do conhecimento:
Ciências Humanas; Educação;
Engenharias; Engenharia de Produção; Gestão da Informação;
Engenharias; Engenharia Civil; Construção Civil; Tecnologia da Informação
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