Publicações - engenharias
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HOEPERS, TAIANE REGINA;
Daniel Costa dos Santos
Palavra-chave:
concepção;
dimensionamento;
etes descentralizadas;
Drenagem Urbana Sustenável
Áreas do conhecimento:
Engenharias; Engenharia Civil; Saneamento Ambiental
resumo ...
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Emilio Carlos Zilli Ruiz;
Afonso Figueiredo Filho;
RETSLAFF, FABIANE APARECIDA DE SOUZA;
GARRETT, ALEXANDRE TECHY DE ALMEIDA;
Rodrigo Geroni Mendes Nascimento;
Mailson Roik;
KARINA HENKEL PROCEKE DE DEUS;
Carla Fernanda Mussio
Palavra-chave:
Biomass modeling;
Araucária crown;;
renewable energy;
Araucaria Forest
Áreas do conhecimento:
CIENCIAS_AGRARIAS; Recursos Florestais e Engenharia Florestal; Manejo Florestal; Dendrometria e Inventário Florestal;
CIENCIAS_AGRARIAS; Recursos Florestais e Engenharia Florestal; Conservação da Natureza; Recuperação de Areas Degradadas;
Engenharias; Engenharia de Energia; Fontes Renováveis de Energia; Energia de Biomassa
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MAIKON DA ROCHA, EDSON;
ÁVILA, SUELEN;
DE LIMA, JAIR JOSÉ DE LIMA;
SCHEFFER DE ANDRADE SILVA, RICARDO;
MIRANDA BACILA, DANNIELE;
Alvaro Luiz Mathias;
Regina Maria Matos Jorge
Palavra-chave:
quality parameter;
processing conditions;
water bleaching
Áreas do conhecimento:
CIENCIAS_AGRARIAS; Tecnologia de Alimentos;
Engenharias; Engenharia Química; Bioprocessos
resumo ...
(en)
The bleaching operation has been utilized to increase the shelf life, reduce enzymatic activity, and lower the microbial load of foods. This study aimed to investigate the effects of blanching time and temperature on three commercial mushroom varieties' lightness and color variation and determine the optimal operation conditions. Three specimens were collected: Agaricus bisporus Paris Champignon, Agaricus bisporus Portobello, and Lentinula edodes Shiitake. The composite central rotational design and the response surface methodology were employed to evaluate the combined effects of blanching temperature (ranging from 53.8°C to 96.2°C) and time (ranging from 10.3 seconds to 349.7 seconds) on the color parameters L* (lightness), a* (redness-greenness) and b* (yellowness-blueness) of mushrooms slices. Cutting, oxygen exposure, and temperature below 75°C significantly affected the color by reducing L* and b* values and increasing a* values, favoring the mushrooms' darkening (higher △L). The bleaching operation optimized to minimize color variation (△E) was at 80°C for 170 seconds for Champignon, 83°C for 209 seconds for Portobello, and 82°C for 186 seconds for Shitake. Blanching fresh mushrooms under these operational conditions can help prevent the development of dark color, thereby improving their quality for human consumption, extending their shelf life, and reducing waste caused by unsightly appearance.
(pt)
A operação de branqueamento tem sido utilizada para aumentar a vida útil, reduzir a atividade enzimática e diminuir a carga microbiana dos alimentos. Este estudo teve como objetivo investigar os efeitos do tempo e da temperatura de branqueamento na luminosidade e na variação de cor de três variedades comerciais de cogumelos e determinar as condições ótimas de operação. Três espécimes foram coletados: Agaricus bisporus Paris Champignon, Agaricus bisporus Portobello e Lentinula edodes Shiitake. O delineamento composto central rotacional e a metodologia de superfície de resposta foram empregados para avaliar os efeitos combinados da temperatura de branqueamento (variando de 60°C a 96,2°C) e tempo (variando de 60 segundos a 349,7 segundos) nos parâmetros de cor L* (luminosidade), a* (vermelho-verde) e b* (amarelo-azul) de fatias dos cogumelos. O corte, a exposição ao oxigênio e a temperatura abaixo de 75°C afetaram significativamente a cor, reduzindo os valores de L* e b* e aumentando os valores de a*, favorecendo o escurecimento dos cogumelos (maior △L). A operação de branqueamento otimizada para minimizar a variação de cor (△E) foi de 80°C por 170 segundos para Champignon, 83°C por 209 segundos para Portobello e 82°C por 186 segundos para Shitake. O branqueamento de cogumelos frescos nessas condições operacionais pode ajudar a prevenir o desenvolvimento de cores escuras, melhorando assim sua qualidade para consumo humano, prolongando sua vida útil e reduzindo o desperdício causado pela aparência desagradável.
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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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