Publicações - engenharias
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GODINHO, J.P.;
Marcelo Henrique Farias de Medeiros;
MELO NETO, A.A.;
LIMA, V.M.E.;
DE SOUZA, D.J.
Palavra-chave:
reações expansivas;
ataque ácido;
ácido sulfúrico biogênico;
durabilidade do concreto
Áreas do conhecimento:
Engenharias; Engenharia Civil; Inovação
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Grazielli Vassoler Rutz;
Michely Laís de Oliveira;
Pinto, M.A.V.
Palavra-chave:
Local Fourier analysis;
Diffusion problem;
Asymptotic convergence factor;
Computational work;
Smoothing analysis
Áreas do conhecimento:
Ciências Exatas e da Terra; Matemática; Matemática Aplicada; Análise Numérica;
Engenharias; Engenharia Mecânica; Fenômenos de Transporte; Princípios Variacionais e Métodos Numéricos;
Engenharias; Engenharia Mecânica; Fenômenos de Transporte; Transferência de Calor
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This work investigates multigrid methods on triangular grids with aggressive coarsening and incomplete factorization smoothers. Two-grid local Fourier analysis is employed to optimize smoothing parameters and ensure rapid convergence under aggressive coarsening. A two-dimensional diffusion problem serves as a test case, demonstrating that aggressive coarsening is a viable alternative to standard coarsening. The results highlight substantial computational and memory savings, making aggressive coarsening an efficient choice for multigrid method.
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DE OLIVEIRA-AVELLAR, BRUNA ROCHA;
MARÇAL, KAWANY;
DOS SANTOS, GUILHERME ALVES;
BOGO, CLEVERSON ROBERTO;
RIBEIRO, RENATO PEREIRA;
Miguel Mansur Aisse
Palavra-chave:
Esgoto Sanitário;
Filtro Biológico Percolador;
nitrificação;
Pos-Tratamento;
tratamento de esgotos
Áreas do conhecimento:
Engenharias; Engenharia Sanitária; Tratamento de Águas de Abastecimento e Residuárias; Processos Simplificados de Tratamento de Águas
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The upflow anaerobic sludge blanket (UASB) reactor effectively removes organic matter from wastewater but does not remove ammoniacal nitrogen, which harms aquatic life in water bodies when in excess. The trickling filter (TF) has been used in Brazil mainly as post-treatment of anaerobic effluents to remove organic carbon and residual solids. Information on N-ammonium removal in UASB–low-rate TF systems at full treatment scale is scarce. Therefore, this work aims to evaluate the performance of a wastewater treatment plant (WWTP), with stone media, featuring natural ventilation and including nighttime effluent recirculation, operating at an average flow rate of 53 L·s−1 in southern Brazil, which combines a UASB reactor and low-rate TF, as well as the transformations of N in the liquid phase of treatment. A 37-month monitoring period was conducted, along with seasonal 24-h sampling campaigns. Results showed that the system’s efficiency was above 90% for the parameters BOD, TSS, and SS, and the results for average N-ammonium removal in the low-rate TF showed a reduction of 18% when compared to the influent. In addition, nitrification was influenced by the N-ammonium load and the recirculation occurring in the system.
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GRIGOROV, EMIL;
Felix Sharipov;
PERRIER, PIERRE;
TOPIN, FRÉDÉRIC;
Graur, Irina
Palavra-chave:
Internal flow;
mass flow rate
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Measurements of the Poiseuille coefficient in the slip and transitional flow regimes - Volume 1025
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PEIXOTO, LUIS OTÁVIO MIRANDA;
DA COSTA PEREIRA, JORGE LUIS GABRIEL FERREIRA DA SILV;
Cristovão Vicente Scapulatempo Fernandes;
CENTENO, JORGE ANTONIO SILVA;
DE AZEVEDO, JÚLIO CÉSAR RODRIGUES
ENVIRONMENTAL MONITORING AND ASSESSMENT (DORDRECHT. ONLINE),
v. 197,
n. 1,
p. 1-24,
2025
DOI
Home page
Palavra-chave:
Caffeine;
environmental monitoring;
environmental modelling;
Water Quality
Áreas do conhecimento:
Engenharias; Engenharia Sanitária; Recursos Hídricos; Planejamento Integrado dos Recursos Hídricos
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Caffeine, considered an emerging contaminant, serves as an indicator of anthropic influence on water resources. This research employs various modeling techniques, including Artificial Neural Networks (ANN), Random Forest (RF), and more, along with hybrid and ensemble methods, to predict caffeine concentrations (in regression and classification scenarios) using readily available water quality parameters. The results indicate Ensemble-RF as the most effective method for estimating caffeine concentrations, while classification scenarios highlight Ensemble-RF, ANN, and Ensemble-ANN as promising methodologies for predicting contamination levels. This study offers a valuable tool for swiftly assessing caffeine contamination in water, leveraging easily obtainable data, with implications for safeguarding water resource systems.
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DE MELLO SAMPAIO, VITÓRIA;
WIELE, NATAN;
DA SILVA VALE, ALEXANDER;
Adenise Lorenci Woiciechowski;
Karp, Susan Grace;
Soccol, Carlos Ricardo;
DE MELO PEREIRA, GILBERTO VINÍCIUS
Palavra-chave:
Alimentos;
aroma production;
Bioprocesssos
Áreas do conhecimento:
Engenharias; Engenharia Química; ENGENHARIA DE BIOPROCESSOS
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The combined inoculation of yeast and lactic acid bacteria (LAB) is a promising approach to enhance microbial metabolism and the quality of fermented food products. In this study, we investigated the effects of simultaneous and sequential inoculation of LAB and yeast on coffee fermentation. Fermentations were conducted using single and combined protocols with P. fermentans YC5.2 and P. pentosaceus LPBF07. A temporal analysis utilizing Illumina high-throughput rRNA Gene Sequencing revealed a synergistic interaction between the two microbial groups. This positive synergy led to increased consumption of coffee pulp sugar and the production of metabolites, surpassing the results observed in single cultures and the spontaneous process. Furthermore, the combined inoculation processes demonstrated a more significant role in suppressing wild microbiota compared to single cultures. Notably, the sequential process emerged as particularly effective in promoting a more intricate aroma profile and elevated sensorial score, attributed to the formation of distinctive compounds such as benzeneacetaldehyde, 1-hexanol, 2-heptanol, benzyl alcohol and phenylethyl alcohol. These results suggest that implementing a sequential inoculation process could enable coffee farmers to standardize on-farm processing and produce high-value-added products.
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Allan Christian Krainski Ferrari;
Gideon Villar Leandro;
LEANDRO DOS SANTOS COELHO
International Journal of Parallel, Emergent and Distributed Systems,
v. 1,
n. 1,
p. 1-22,
2025
DOI
Home page
Palavra-chave:
identificação de sistemas;
Metaheurísticas
Áreas do conhecimento:
Engenharias; Engenharia Elétrica; Controle de Processos;
Engenharias; Engenharia Elétrica; Inteligência Artificial;
Engenharias; Engenharia Elétrica; Identificação de Sistemas
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Allan C. Krainski Ferrari;
Gideon Villar Leandro;
COELHO, L. DOS S.
INTERNATIONAL JOURNAL OF PARALLEL, EMERGENT AND DISTRIBUTED SYSTEMS (PRINT),
v. 40,
n. 4,
p. 424-445,
2025
DOI
Palavra-chave:
Multi-objective optimization,;
metaheuristics;
Identification system;
Multivariable systems
Áreas do conhecimento:
Engenharias; Engenharia Elétrica; Inteligência Artificial;
Engenharias; Engenharia Elétrica; Sistemas de Controle; Identificação de Sistemas
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Jóse Viriato Coelho Vargas;
MARIANO, ANDRÉ BELLIN;
SEVERO, IHANA AGUIAR;
FERRAZ, FERNANDO AUGUSTO;
COSTA, IAGO GOMES;
GUIMARÃES, MATHEUS MURMEL;
ZATTONI, INGRID FATIMA;
BIANCHINI, LUIZ FERNANDO;
VARGAS, JOSÉ VIRIATO COELHO;
TAHER, DHYOGO MILÉO
Palavra-chave:
microalgae bioproducts;
sustainable energy
Áreas do conhecimento:
Ciências Biológicas; Biotecnologia; Biotecnologia Industrial;
Engenharias; Engenharia Mecânica; Engenharia Térmica; Aproveitamento da Energia
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The microalga Tetradesmus obliquus has emerged as a promising candidate for biotechnological and industrial applications due to its rapid growth, resilience under diverse environmental conditions, and potential for bioactive compound production. This study presents a multiparametric characterization of dry T. obliquus biomass cultivated in patented industrial-scale photobioreactors, integrating thermochemical, elemental, antioxidant, and protein analyses. Proximate and ultimate analyses were conducted to assess fuel potential, revealing favorable volatile matter (VM = 64.80–72.44%) and fixed carbon (FC = 15.77–21.23%) contents. The HHV (18.32–22.75 MJ·kg−1) and LHV (16.86–21.24 MJ·kg−1) confirmed the biomass as a viable candidate for solid biofuel. The elemental composition provided the total nitrogen values, subsequently used to estimate the protein content via both the Kjeldahl and Dumas methods, with results ranging from 36.66% to 40.02%, in line with the literature. Despite the absence of detectable antioxidant activity under the tested DPPH conditions, the biomass demonstrated a robust nutritional profile and energy potential. These findings support the industrial relevance of T. obliquus biomass, particularly for applications targeting sustainable protein sources and bioenergy solutions.
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MACIOSKI, GUSTAVO;
SANCHEZ, LEANDRO F.M.;
Marcelo Henrique Farias de Medeiros
Palavra-chave:
reação álcali-sílica;
fibra ótica;
durabilidade do concreto
Áreas do conhecimento:
Engenharias; Engenharia Civil; Inovação
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