Publicações - engenharias
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MAMADOU, A.F.I.;
Jóse Viriato Coelho Vargas;
SANYA, S.A.O.;
PITZ, D.B.;
SANOUSSI, B.R.;
IDRISSOU, M.O.K.;
ORDONEZ, J.C.
Palavra-chave:
Optimal Area Allocation;
mathematical modeling;
Absorption Refrigeration
Áreas do conhecimento:
Engenharias; Engenharia Mecânica; Engenharia Térmica; Aproveitamento da Energia
resumo ...
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KAVA, VANESS MERLO;
Jóse Viriato Coelho Vargas;
ORDONEZ, J.C.;
MARIANO, ANDRÉ BELLIN
Revue Roumaine des Sciences Techniques-Serie Electrotechnique et Energetique,
v. 70,
n. 2,
p. 259-262,
2025
DOI
Palavra-chave:
Exergy destruction;
evolutionary design;
nucleus;
archaebacterium
Áreas do conhecimento:
Ciências Biológicas; Biologia Geral;
Engenharias; Engenharia Mecânica; Engenharia Térmica; Termodinâmica
resumo ...
(en)
The origin of eukaryotes is regarded as one of the most significant issues in the history of life. Various perspectives aim to provide a comprehensive understanding of eukaryote origins, drawing on paleontological evidence, energetics, the unique characteristics of eukaryotes, and the relationships between different eukaryotic groups. Several versions of the endosymbiotic theory have been proposed to explain the emergence of eukaryotes and their mitochondria. Only recently have energy and energetic constraints been integrated into this theory, recognizing that the prokaryotic cell structure played a crucial role in the development of eukaryotic complexity. Specifically, cells with mitochondria possess the bioenergetic capabilities necessary for this complexity, which explains the absence of transitional forms between prokaryotes and eukaryotes. This study explores eukaryotes' origins through the lens of constructal theory, which posits that “for a flow system to persist over time (to survive), it must evolve to facilitate easier and more efficient flow.” In this context, the theory suggests that the evolution of systems is driven by a need for optimal architecture and flow organization, reducing resistance to internal flows (exergy losses) that sustain the system. This framework is proposed as the underlying principle behind the origin of eukaryotes, mitochondria, chloroplasts, and the eukaryotic nucleus.
(fr)
L'origine des eucaryotes est considérée comme l'une des questions les plus importantes de l'histoire de la vie. Diverses perspectives visent à fournir une compréhension globale de leurs origines, en s'appuyant sur des données paléontologiques, l'énergétique, les caractéristiques uniques des eucaryotes et les relations entre les différents groupes eucaryotes. Plusieurs versions de la théorie endosymbiotique ont été proposées pour expliquer l'émergence des eucaryotes et de leurs mitochondries. Ce n'est que récemment que l'énergie et les contraintes énergétiques ont été intégrées à cette théorie, reconnaissant le rôle crucial de la structure cellulaire procaryote dans le développement de la complexité eucaryote. Plus précisément, les cellules mitochondriales possèdent les capacités bioénergétiques nécessaires à cette complexité, ce qui explique l'absence de formes transitionnelles entre procaryotes et eucaryotes. Cette étude explore les origines des eucaryotes à travers le prisme de la théorie constructale, qui postule que « pour qu'un système de flux persiste dans le temps (pour survivre), il doit évoluer pour faciliter et optimiser son écoulement ». Dans ce contexte, la théorie suggère que l'évolution des systèmes est motivée par le besoin d'une architecture et d'une organisation des flux optimales, réduisant la résistance aux flux internes (pertes d'exergie) qui soutiennent le système. Ce cadre est proposé comme principe sous-jacent à l'origine des eucaryotes, des mitochondries, des chloroplastes et du noyau eucaryote.
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Walter Collischonn;
MARCUZZO, FRANCISCO FERNANDO NORONHA;
MICHEL, ROSSANO DALLA LANA;
BESKOW, TAMARA LEITZKE CALDEIRA;
BESKOW, SAMUEL;
FERNANDES, ELISA HELENA LEÃO;
SANTOS, LEONARDO LAIPELT DOS;
RUHOFF, ANDERSON;
Masato kobiyama;
COLLARES, GILBERTO LOGUERCIO;
BUFFON, FRANCO;
FAN, FERNANDO MAINARDI;
DUARTE, EMANUEL;
POSSANTTI, IPORÃ;
DORNELLES, FERNANDO;
PAIVA, RODRIGO;
MEDEIROS, MATHEUS SAMPAIO;
MICHEL, GEAN PAULO;
MAGALHÃES FILHO, FERNANDO JORGE CORREA;
MORAES, SOFIA ROYER;
et.al
Palavra-chave:
natural disasters;
Extreme hydrological events
Áreas do conhecimento:
Engenharias; Engenharia Sanitária; Recursos Hídricos; Planejamento Integrado dos Recursos Hídricos
resumo ...
ABSTRACT We present an overview of the unprecedent hydrological event that occurred in Rio...
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LIMA, BARBARA ALVES DE;
MODKOVSKI, TATIANI ANDRESSA;
CHAVES, JULIANE RIBEIRO DAS;
PEIXOTO, LUIS OTÁVIO MIRANDA;
MEDEIROS, SAMANTA TEIXEIRA;
BAER, GABRIEL HELMER;
Cristovão Vicente Scapulatempo Fernandes;
Julio Cesar de Azevedo
Palavra-chave:
emergent contaminants;
Water Quality
Áreas do conhecimento:
Engenharias; Engenharia Sanitária; Recursos Hídricos; Planejamento Integrado dos Recursos Hídricos
resumo ...
ABSTRACT Human actions are caused by multiple ecological stresses that affect native biotas....
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Julio Cezar de Almeida;
alexandre pescador sarda;
Leomar Gomes Júnior;
Flávio Fernandes Cesar Lima
Palavra-chave:
Mass-Spring System;
Mechanical Vibrations;
engineering education;
MATLAB
Áreas do conhecimento:
Engenharias; Engenharia Mecânica; Métodos Numéricos; Método de Elementos de Contorno;
Engenharias; Engenharia Mecânica; Mecânica dos Sólidos; Dinâmica dos Corpos Rígidos, Elásticos e Plásticos
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DUPONT, GABRIELE KUHN;
FILHO, MARCO AURÉLIO DA SILVA CARVALHO;
PEDROSA, LETÍCIA LEONARDI;
Carlos Itsuo Yamamoto;
POSSETI, GUSTAVO RAFAEL COLLERE
Palavra-chave:
lodo de esgoto;
Saneamento
Áreas do conhecimento:
Engenharias; Engenharia Química; Bioprocessos
resumo ...
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DUPONT, GABRIELE KUHN;
FILHO, MARCO AURÉLIO DA SILVA CARVALHO;
Carlos Itsuo Yamamoto;
POSSETTI, GUSTAVO RAFAEL COLLERE
Palavra-chave:
lodo de esgoto;
Saneamento
Áreas do conhecimento:
Engenharias; Engenharia Química; Bioprocessos
resumo ...
(en)
Purpose: To evaluate the physicochemical composition, nutrient profile, and regulatory compliance of thermally dried sewage sludge (DSS) produced at a full-scale wastewater treatment plant in southern Brazil, assessing its potential for agricultural reuse within circular economy frameworks.
Methodology: A 12-month monitoring campaign was conducted from November 2022 to October 2023. Monthly DSS samples were collected post-thermal drying (300 °C, 50 min) and analyzed for moisture, volatile matter, ash, pH, total organic carbon (TOC), macronutrients (P, K, Ca, Mg), nitrogen fractions (TKN, TAN), and heavy metals regulated by Brazilian standards.
Findings: Moisture content varied widely (1.35–30.61%), influenced by seasonal precipitation. Volatile matter and ash averaged 44.91% and 38.85%, respectively, while TOC averaged 20.45%. Phosphorus (2.03–2.49%) and calcium (1.07–1.35%) were present at agronomically relevant levels, whereas potassium remained low (0.08–0.15%). All heavy metals complied with national thresholds, except for one isolated zinc exceedance (8,800 mg·kg⁻¹). Overall, DSS demonstrated suitability for agricultural application under regulated conditions.
Unique Contribution to Theory, Practice and Policy: This study provides the first comprehensive dataset on thermally dried sewage sludge in Brazil, supporting its safe reuse as a nutrient source and reinforcing circular economy strategies in the sanitation sector. The findings offer a scientific basis for policy development and biosolids valorization, contributing to sustainable waste management and resource recovery.
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Marly Terezinha Quadri Simoes da Silva;
MAZER, WELLINGTON
Palavra-chave:
diffusion;
Tortuosity;
Brownian motion;
chloride ion;
Stokes-Einstein
resumo ...
(en)
Chloride ion transport helps predict the durability of reinforced concrete structures. For this purpose, predicting chloride ion penetration, diffusion and tortuosity for porous structural materials improves the definition of structural service life. This work proposes the definition of models to determine the diffusion coefficient of chloride ions through the application of fractals, more precisely using Brownian motion. In the research, the Stokes-Einstein diffusion equation and the equations to determine the diffusion coefficient, Langevin and Einstein relations were used as reference. These equations were combined and resulted in new diffusion equations. Thus, two paths emerged for carrying out Brownian motion in research: one considering two types of correction in the displacement when using the Langevin equations and the Einstein relation to follow the Brownian motion and another where the correction occurs in the combination of the Stokes-Einstein, Langevin and Einstein equations to determine the diffusion and subsequently implement the Brownian motion. These combinations prevent the numerical value of tortuosity from being greater than that found with the reference equation and slow diffusion. With this, modeling of the prediction of chloride ion penetration, prediction of diffusion for a future time, and definition of tortuosity for porous structural materials can be performed in new ways.
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DA SILVA, HELOÍSA ROBERTO P.;
COSTA, IAGO G.;
OLIVEIRA, ANNE C.D.;
Severo, Ihana A.;
NANCLARES, JUAN C.;
ORDONEZ, J.C.;
Jóse Viriato Coelho Vargas;
MARIANO, ANDRÉ B.
Palavra-chave:
inverse problem of parameter estimation;
microalgae oil extraction;
thermodynamic optimization
Áreas do conhecimento:
Ciências Biológicas; Biotecnologia; Biotecnologia Industrial;
Engenharias; Engenharia Mecânica; Engenharia Térmica; Aproveitamento da Energia
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Leandro Alves dos Santos;
KRIEGER, NADIA;
MITCHELL, DAVID ALEXANDER;
Cesar Mateo
Palavra-chave:
lipase;
immobilization
Áreas do conhecimento:
Engenharias; Engenharia Química; Processos Industriais de Engenharia Química; Processos Bioquímicos
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