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263 results on '"Maciel Filho, Rubens"'

1. Predicting mortality of cancer patients using artificial intelligence, patient data and blood tests

Author

Martins, Tiago D., Maciel-Filho, Rubens, Montalvão, Silmara A. L., Gois, Gabriele S. S., Al Bannoud, Mohamad, Ottaiano, Gabriel Y., Anhaia, Thaizy R. A., Almeida, Millene E. A., Ferreira, Monique R. M., Martinelli, Beatriz M., Fernandes, Maria C. G. L., Huber, Stephany C., Ribeiro, Daniel, Teixeira, Júlio C., Carvalheira, José B. C., Lima, Carmen S. P., Andreollo, Nelson A., Etchebehere, Maurício, Zambon, Lair, Ferreira, Ubirajara, Tincani, Alfio J., Martins, Antônio S., Coy, Cláudio S. R., Seabra, José C. T., Mussi, Ricardo K., Tedeschi, Helder, and Anninchino-Bizzacchi, Joyce M.

Published
2024
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6. Chemical Engineering Teaching in COVID-19 Times: Successfully Adapting a Capstone Design Course to a Remote Format

Author

Khouri, Nadia G., Fontana, Michelli, Dias, Igor L. R., Maciel, Maria R. W., Maciel Filho, Rubens, and Mariano, Adriano P.

Abstract

The coronavirus COVID-19 pandemic required educational institutions to adapt face-to-face to remote teaching. This study reports the experience in the first semester of 2020 for a Chemical Engineering Capstone Design Course at the University of Campinas in Brazil. In this course, senior year students develop a group project, in which they simulate a chemical plant and evaluate its technoeconomic feasibility. In 2020, the groups were proposed to design a process to replace diesel fuel from the bus fleet in Campinas city with renewable fuel DME. Because of the pandemic, several adaptations were needed: the theoretical classes became asynchronous, group meetings were online, a commercial simulator was replaced by an open access one, and the schedule was extended by 2 weeks. Despite that, the students had a great performance, comparable to face-to-face. To assess student satisfaction, a questionnaire was used. The course met the expectations of most of the students who also recommended keeping it in the remote format or merging it with face-to-face teaching. Therefore, these changes made it possible to apply new teaching dynamics and tools that could be used in the future to improve the course quality.

Published
2021
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8. A competency-based chemical engineering curriculum at the University of Campinas in Brazil

Author

Franco, Luís Fernando Mercier, da Costa, Aline Carvalho, de Almeida Neto, Ambrósio Florêncio, Moraes, Ângela Maria, Tambourgi, Elias Basile, Miranda, Everson Alves, de Castilho, Guilherme José, Doubek, Gustavo, Dangelo, José Vicente Hallak, Fregolente, Leonardo Vasconcelos, Lona, Liliane Maria Ferrareso, de La Torre, Lucimara Gaziola, Alvarez, Luz Adriana, da Costa, Mariana Conceição, Martinez, Patricia Fazzio Martins, Ceriani, Roberta, Zemp, Roger Josef, Vieira, Roniérik Pioli, Maciel Filho, Rubens, Vianna, Sávio Souza Venâncio, Bueno, Sonia Maria Alves, Vieira, Melissa Gurgel Adeodato, and Suppino, Raphael Soeiro

Published
2023
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48. Environmental Assessment of Liquid Hydrogen Production Routes.

Author

Silva Ortiz, Pablo, Jia-Wei Lin, Pinto Mariano, Adriano, Maciel Filho, Rubens, and Jocher, Agnes

Subjects
HYDROGEN production, STEAM reforming, ELECTROLYSIS, GREENHOUSE gas mitigation, RENEWABLE energy sources
Abstract

Recently, hydrogen has been explored as an aviation energy carrier to support various critical energy challenges for the upcoming decades. Thus, conventional and non-conventional hydrogen production methods have been developed worldwide. This paper investigates Steam Methane Reforming (SMR) and Alkaline Electrolysis (AWE) hydrogen production as primary processes from an energy requirement and life cycle perspective. Besides, It also considers hydrogen liquefaction for aviation use. In this context, an attributional, Cradle-to-Gate life cycle assessment was carried out to compare the environmental impact of SMR and AWE hydrogen production processes under four German energy mix scenarios. The assessment method selected was ReCiPe 2016, and the main impact categories were climate change and acidification potential. The results show that greenhouse gas emissions from each production method highly depend on energy sources. The CO2 emissions from SMR and AWE processes in a base case scenario are 12 and 51 kgCO2eq/kgH2, respectively, and these values decrease to 7 (SMR) and 22 kgCO2eq./kgH2 (AWE) in a 2050 renewable energy scenario. Concerning the energy requirements, each process requires different energy amounts to produce 1 kgH2 (functional unit). SMR requires 11.3 kWh, AWE 61.8 kWh, and hydrogen liquefaction 5.1 kWh. In brief, hydrogen is widely promoted as an alternative energy carrier in Germany; however, depending on the production process and technical considerations, further studies are required to support and explore its applications. [ABSTRACT FROM AUTHOR]

Published
2024
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49. Effectiveness and Quality of Coating Different Polymeric Coupons with Cellulose Hydrogels.

Author

Estevam, Bianca R., Azevedo, Gabriel A., Cavallini Junior, Aldemir A., Maciel Filho, Rubens, Moraes, Ângela M., and Fregolente, Leonardo V.

Subjects
HYDROGELS, ACRYLATES, POLYAMIDES, EPICHLOROHYDRIN, SOLUTION (Chemistry)
Abstract

This study aimed to analyse and compare the effects of dip-coating with cellulose hydrogel coupons of Acrylonitrile Styrene Acrylate (ASA), polyamide (Nylon®), and Tritan® to produce hydrophilic structures for water uptake from fuels. In this process, the polymeric substrates were immersed in a cellulose solution after adding the crosslinking agent (epichlorohydrin). The samples were kept in the solution at 30 ºC for 1 h and then removed at a withdrawn speed of 98 or 410 mm.min-1. The coated and uncoated materials were characterized regarding contact angle, mass of hydrogel adhered and surface morphology. In addition, the roughness of the uncoated substrates was measured. The samples underwent sequential swelling and drying cycles to evaluate water retention and the possibility of reusing the material. Tukey test, at a 95 % confidence level, was used to assess differences in roughness, the mass of adhered hydrogel, contact angle, and swelling degree for each polymeric substrate and condition analysed. The coated coupons exhibited increased hydrophilicity when compared to the uncoated control group, reaching a water contact angle of around 50 º. ASA displayed the greatest incorporation of hydrogel; however, it was mainly retained in the grooves of the material, limiting its ability to interact with water. Meanwhile, the hydrogel film formed on Nylon® coupons achieved a higher degree of swelling (3.5-3.9 g.g-1). Thus, this study demonstrated that the material used in the coating process strongly influenced the characteristics of the hydrogel film formation and its performance regarding water retention. [ABSTRACT FROM AUTHOR]

Published
2024
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50. Techno-economic Analysis and Life Cycle Assessment of Renewable Acetaldehyde from Sugarcane Ethanol.

Author

Leal Silva, Jean Felipe and Maciel Filho, Rubens

Subjects
ACETALDEHYDE, ETHANOL as fuel, FEEDSTOCK, GAS phase reactions, OXIDATION of ethylene
Abstract

Acetaldehyde has been historically synthesized from ethanol via oxidation. However, since the 1960s, the cost of feedstock and conversion process has gradually driven manufacturers to prefer the liquid-phase oxidation of ethylene. However, the aggravation of the effects of the climate crisis demands a shift from fossil feedstocks to renewable feedstocks to reduce society’s CO2 footprint. Moreover, sugarcane ethanol production is a more mature process nowadays, delivering a low-cost renewable chemical. Bearing all this in mind, this work analyzes the viability of the production of acetaldehyde via oxidation of sugarcane ethanol. The key idea is to integrate the process into a sugarcane biorefinery to take advantage of the surplus energy of optimized distilleries to provide renewable energy for acetaldehyde production. The oxidation process of ethanol to acetaldehyde in the gas phase was simulated using literature data. Process data for the remaining sections of the sugarcane biorefinery were based on literature data as well. Based on equipment sizing and processing capacity, a cash flow analysis was performed to determine the best operating conditions for acetaldehyde production via ethanol oxidation. Results have shown that the conversion of ethanol to acetaldehyde using this process is competitive and can increase the earnings of the biorefinery. A life cycle assessment was performed as well to compare the carbon intensity of acetaldehyde produced from ethanol to the carbon intensity of acetaldehyde produced via direct oxidation of ethylene, showing a reduction of 85%. Results demonstrate that the oxidation of ethanol represents a renewable alternative with economic potential when integrated into a sugarcane biorefinery. [ABSTRACT FROM AUTHOR]

Published
2024
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