Publicações - engenharias
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Marcelo Henrique Farias de Medeiros;
LOPES, RAYANE CAMPOS;
REAL, LIGIA VITÓRIA;
RIVAROLA, GUSTAVO BORTOLAN;
OLIVEIRA, ANDRIELLI MORAIS DE;
CASCUDO, OSWALDO
Palavra-chave:
Durabilidade;
Materiais cimentícios suplementares;
Cimento;
adição mineral;
pozolanas;
Método dos quatro eletrodos
Áreas do conhecimento:
Engenharias; Engenharia Civil; Inovação
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DOS ANJOS, THIAGO VINICIUS;
WOLFF LEAL, TARCISIO;
SCOLARO, LETÍCIA MARIA;
Carlos Itsuo Yamamoto;
UENO, OSCAR KHOITI;
VALADARES FOLGUERAS, MARILENA
Palavra-chave:
chumbo;
Escória
Áreas do conhecimento:
Engenharias; Engenharia Química; Bioprocessos
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The use of industrial waste in cementitious materials has been extensively studied as a sustainable alternative to reduce environmental impact and valorize by-products. The aim of this study was to evaluate the effects of the incorporation of secondary lead slag (<200 mesh) from two different sources on the mechanical, microstructural and environmental properties of metakaolin-based geopolymers. After 28 days of curing, analyses of compressive strength, X-ray diffraction, scanning electron microscopy, porosimetry, specific surface area and leaching of potentially toxic elements (PTEs) were performed. The addition of 20% slag led to a reduction in compressive strength of 25.3% (slag A) and 16.7% (slag B) compared to the reference sample. Despite the formation of damaging pores and cracks, both formulations showed effective immobilization of PTEs, with leachate concentrations below the limits specified in NBR 10004 (2004). The results show that the chemical composition of the slag significantly influences the final properties of the material. This study highlights the potential of geopolymers as a solution for the recycling of hazardous waste and the reduction in emissions associated with the cement industry.
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SAMPAIO, ANDRÉ;
CARNEIRO, JAQUELINE;
FURMAN, GIOVANNA;
PICHETH, GUILHERME F.;
GERHARDT, EDILEUSA M.;
Marcelo Muller dos Santos;
CHUBATSU, LEDA;
DE SOUZA, EMANUEL MALTEMPI;
TODO BOM, MARITZA ARAUJO;
BUDEL, MARIA L. T.;
WENDLER MIRANDA, BRENNO;
DIAS, ISABELA P.;
FILHO, RAFAEL X. V.;
CASANI CARDOSO, GABRIELA;
RAMOS, EDNEIA AMANCIO DE SOUZA;
JACUMAZO, JOSLAINE
Palavra-chave:
nanoparticles;
Polyhydroxybutyrate;
Substrate-Binding Domain;
sfGFP;
Protein immobilization;
Fusion protein
Áreas do conhecimento:
Engenharias; Engenharia Biomédica; Engenharia Médica; Biomateriais e Materiais Biocompatíveis
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ALMEIDA, JOANA;
GOUVEIA, JOANA R.;
RIBEIRO, INÊS S.;
GOMES PIRES, CAROLINA MOCELIN;
MATEUS, EDUARDO P.;
RIBEIRO, ALEXANDRA B.
Palavra-chave:
Waste recovery;
electro-based technology;
Life cycle assessment;
lítio
Áreas do conhecimento:
Engenharias; Engenharia Mecânica; Métodos Numéricos; Método de Elementos de Contorno;
Engenharias; Engenharia Química; Bioprocessos
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SIGNORI-IAMIN, GIOVANA;
AGUADO, ROBERTO J.;
PUTAUX, JEAN-LUC;
Alexandre Ferreira Santos;
THIELEMANS, WIM;
DELGADO-AGUILAR, MARC
Palavra-chave:
nanocelulose;
modeling
Áreas do conhecimento:
Engenharias; Operações Industriais e Equipamentos para Engenharia Química
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ALVES, GEOVANE AMANCIO;
Claudimir José Rebeyka;
Dalberto Dias da Costa
Palavra-chave:
eficiencia energetica;
Furação;
sustentabilidade;
usinagem
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Despite extensive research on machining processes in recent decades from a manufacturing sustainability perspective, some processes receive less attention compared to others. Drilling is one such example, which contrasts with its high importance and utilization in the discrete manufacturing sector. In this work, a systematic review on Energy Efficiency and Consumption (EEC) of mechanical drilling was carried out. The review was planned based on four Research Questions (RQs). The first one is concerned with the relevance of research on drilling when compared to other machining processes. The second one questioned the impact of machine tool selection on drilling energy consumption. The third RQ reviewed the impact of cutting conditions, drilling strategy, and tool parameters on EEC. The fourth RQ was delineated and aimed to review how the use of cutting fluids impacts EEC. From the sample of papers reviewed in this work it was concluded that only a small fraction of it (approximately 7.5%) focused on drilling, when compared to milling, turning and other machining processes. However, concerning the other three RQs it was concluded that they remain open, which demands further investigation. These gaps come partially from an absence of a standardized framework to address the influence of process parameters on EEC and more holistic base analysis of alternative processes able to manufacture products demanding holes.
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DE LIRA, GILVANA SCOCULI;
Severo, Ihana A.;
GUERRA, HENRIQUE P.;
FERRAZ, FERNANDO A.;
MARTINS, LAUBER S.;
ORDONEZ, J.C.;
Jóse Viriato Coelho Vargas;
TAHER, DHYOGO M.;
MARIANO, ANDRÉ B.
Palavra-chave:
Municipal Solid Waste;
thermal power plants
Áreas do conhecimento:
Engenharias; Engenharia Mecânica; Engenharia Térmica; Aproveitamento da Energia
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The increasing demand for sustainable energy solutions has intensified interest in lignocellulosic biomass as a renewable alternative to fossil fuels. This study assesses the bioenergy potential from maintenance activities on a university campus in southern Brazil, typically underutilized resource for energy recovery. Residues, though poorly managed, present a viable pathway for waste valorization and renewable energy generation. A comprehensive physicochemical characterization was conducted through proximate and ultimate analyses, along with moisture content and higher heating value (HHV) determination. Biomass characterization recorded fixed carbon (20.14–22.45%), volatile matter (76.02–77.95%), ash content (1.56–2.39%), and calorific values (18.63–19.59 MJ/kg). The ultimate analysis recorded carbon (46.10–48.79%), hydrogen (5.96–6.35%), oxygen (44.30–47.14%), and nitrogen (0.32–0.79%). To evaluate its energy recovery potential, a steady-state thermodynamic model simulated the combustion of 50 kg/h lignocellulosic biomass in an incineration system coupled with a Rankine cycle power plant, achieving a peak output of 63.32 kW. The novelty lies in modeling the energy recovery potential of a highly heterogeneous biomass stream, derived from non-industrial forest maintenance, an area scarcely explored in the literature. This research provides valuable data and modeling insights to guide energy systems design using low-grade, heterogeneous biomass fuels. Additionally, the study demonstrates how targeted heat exchanger optimization in the Rankine cycle can improve overall efficiency. The findings advance waste-to-energy strategies and open opportunities for future research in scaling up this approach to regions and types of biomass waste.
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GEHRKE, ALINE GONÇALVES;
WIELEWSKI, LEONARDO PELLIZZARI;
WIGGERS, VINICYUS RODOLFO;
BOTTON, VANDERLEIA;
MITCHELL, DAVID ALEXANDER;
KRIEGER, NADIA
Palavra-chave:
Bio-oil;
lipase;
esterification
Áreas do conhecimento:
Engenharias; Engenharia Química; Processos Industriais de Engenharia Química; Processos Bioquímicos
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Fast pyrolysis of vegetable oils and residues generates bio-oil (BO), a renewable hydrocarbon source with high acidity that limits its direct use in refineries. In this study, BOs were produced from refined soybean oil (RSO) and waste cooking oil (WCO) at 525 °C in a continuous bench-scale pyrolysis at 525 °C, with a 390 ± 8 g h−1 feed rate, under steady-state conditions. The resulting bio-oils exhibited high acidity (acid index of 145 and 127 mg KOH g−1, respectively) and elevated olefinic and oxygen contents, making them corrosive and unsuitable for co-refining with petroleum. To reduce acidity, ethyl esterification was performed using lipase B from Candida antarctica (CALB), using a Box–Behnken 33 factorial design. Variables included temperature (40–60 °C), bio-oil:ethanol mass ratio (1:1–1:5), and catalyst concentration (3–10% w/w). The acid index was reduced by up to 76%, with optimal conditions (62 °C, 1:1 mass ratio, 11% CALB) yielding a final value of 28 mg KOH g−1. Similar reductions were obtained for waste cooking oil bio-oil, confirming robustness across feedstocks. CALB retained over 70% activity after three cycles, demonstrating stability. This enzymatic esterification process shows strong potential for lowering bio-oil acidity, enabling integration into petroleum refineries, diversifying feedstocks, and advancing renewable fuel production.
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ARIELLO, ANA FLÁVIA;
PIRES, CAROLINA M. G.;
Marcelo Kaminski Lenzi;
PONTE, MARIA JOSÉ J. S.;
PONTE, HAROLDO A.
Palavra-chave:
Eletroquimica
Áreas do conhecimento:
Engenharias; Engenharia Química; Bioprocessos
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Marcio Brandani Tenório;
LAJARIN, SÉRGIO FERNANDO;
GIPIELA, MANOLO LUTERO;
MARCONDES, PAULO VICTOR PRESTES
Palavra-chave:
clinching;
Conformação plástica;
União por deformação;
Chapa metálica
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