JOSÉ VIRIATO COELHO VARGAS

Universidade Federal do Paraná

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Papers

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i-10 index

Research Trends

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Document Type

Co-Authors

André Bellin Mariano

Universidade Federal do Paraná

154

Juan C. Ordóñez

Florida State University

141

Wellington Balmant

Universidade Federal do Paraná

Beatriz Jacob Furlan

Universidade Federal do Paraná

Vanessa Kava

Universidade Federal do Paraná

Dhyogo Miléo Taher

Universidade Federal do Paraná

Lauber Martins

Universidade Federal do Paraná

Adrian Bejan

Duke University

Rafael Silva Ribeiro Gonçalves

Universidade Federal do Paraná

Murilo Gasparin Rampi

Universidade Federal do Paraná

Cooperative Institutions

Universidade Federal do Paraná

215

Duke University

Ford Foundation

Doris Duke Charitable Foundation

Hewlett Foundation

Kresge Foundation

Jerome Foundation

McKnight Foundation

Florida State University

Universidade de São Paulo

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Software para Simulação de Crescimento de Microalgas em Fotobiorreatores Tubulares

Proceeding Series of the Brazilian Society of Computational and Applied Mathematics (2016)

Robert Luis Ribeiro André Bellin Mariano JOSÉ VIRIATO COELHO VARGAS

Microalgas são apresentadas como fonte de energia alterativa ao petróleo, sendo capaz de transformar a energia solar em biodiesel. Desta forma, o Núcleo de Pesquisa e Desenvolvimento em Energia Auto-Sustentável (NPDEAS/UFPR) está construindo fotobiorreatores tubulares para cultiva estes microorganismos, também elabora um software para simular o crescimento microalgal.

Simula

10.5540/03.2016.004.01.0037

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EDITORIAL

Revista de Engenharia Térmica (2010)

JOSÉ VIRIATO COELHO VARGAS

I would like to direct the attention of the reader to the matter of sustainable progress and development. The first world nations, having started the industrial revolution, have experienced an evolution process longer than the other nations in the globe. Hence, as a rule of thumb, their enterprises have considered a sustainability view. However, the other nations, aiming at their own industrial development and reducing the gap with respect to the more developed countries, normally neglect that aspect, generating a chaotic development of unforeseen consequences, such as India, China, and Brazil itself. A quite illustrative example is the overwhelming global advance of the electronics industry in the past 30 years. Brazilians produce more than 300 tons of electronic residues annually. Unfortunately, the country does not have appropriate places for the disposal of that equipment. The chemical composition of those residues is very diverse. If those plastics and metals are disposed incorrectly in nature, they have the potential to contaminate the soil, the water, and the entire environment. In the first world, there is a established industry for reselling the used electronics that has not been established in Brazil, perhaps due to a cultural issue, then, this turns the country into one of the greatest generators of electronic residues in the world. The used electronic boards are sold as scrap metals and plastics at a low price to Europe for reprocessing and the rest is simply buried, since they contain brome based plastics that are not suitable for recycling with currently available technologies. There are several possible routes for searching a solution to the problem, such as mechanical, chemical, and energetic plastics recycling, and for the metals pyrometallurgy, hydrometallurgy, mechanical processing and electrometallurgy. However, all such routes require scientific research and development in which certainly the area of thermal engineering is a major component.

Electronic waste

Industrial Revolution

10.5380/reterm.v9i1-2.61923

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Thermal Response of Rats to Different Types of Trauma

Journal of Trauma and Acute Care Surgery (2004)

Daniel R. Colman JOSÉ VIRIATO COELHO VARGAS Marcos Leal Brioschi Maria I.C. Lorusso Alexandre K. da Silva

Background: Hypothermia is commonly observed in victims of trauma, and it is generally combined with shock caused by either hemorrhagic or nonhemorrhagic mechanisms. This study deals with phenomena related to nonhemorrhagic mechanisms. The objective is to document through experimental evidence the existence of a natural mechanism in rats that compensates for the inadequate tissue perfusion in the presence of shock by reducing body temperature (hypothermia). Methods: Different types of trauma are analyzed (i.e., abdominal cavity and bowel exposure) and compared with other groups that suffered, additionally, femur fracture and partial hepatectomy. Further thermal alterations are also studied as consequences of vascular phenomena involving the elevation of intra-abdominal pressure and clamping of arteries and veins, such as the aorta and inferior vena cava. The loss of energy and temperature response of the animals is documented in time through charts with experimental uncertainties. Results: It is concluded that exposure of the bowels is the main factor involved in the genesis of hypothermia, regardless of the associated trauma. Plastic film is shown to be the most effective way to avoid heat loss in bowel exposure. An optimal intra-abdominal pressure, Popt ≅12 mm Hg, is found such that heat flux loss is minimum in pneumoperitoneal procedures. Conclusion: Aortic and inferior vena cava clamping induces hypothermia at levels comparable to bowel exposure.

10.1097/01.ta.0000109886.36684.5b

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FINNED ELLIPTIC TUBES HEAT EXCHANGERS IN THE TURBULENT REGIME CONSTRUCTAL DESIGN

Manuel Pereira Jeferson Ávila Souza JOSÉ VIRIATO COELHO VARGAS Diogo B. Pitz Juan C. Ordóñez

This work seeks numerically the heat exchanger structure direction of evolution in time, i.e., the general optimal that maximizes the total heat transfer rate between a fixed volume arrangement of finned tubes and a turbulent external flow governed by a pressure difference, both for circular and elliptic tube arrays. In this way, the dynamic, ever-changing heat exchanger design that provides easier access to the currents that flow through it is sought for any time reality (e.g., geometry, materials, environment), according to Constructal law. The optimization procedure began by recognizing the limited availability of the design space as a fixed volume constraint. The three-way optimized (3wo) arrangement concerning tube-to-tube distance, eccentricity, and fin density was found as (S/2b, e, ϕf)3wo ≅ (0.5; 0.4; 0.094). A relative heat transfer gain of up to 38% was noted with the elliptic compared to the 3wo circular arrangement, demonstrating that elliptical tube arrangements have potential for considerably better performance and lower cost than traditional circular arrangements.

Constructal law

10.59277/clc.2024.31

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Paranaguá Estuarine Complex Diatoms: Morphology and Molecular Taxonomy

Brazilian Archives of Biology and Technology (2022)

Viviane de Fátima Moura Aguillar Rampinelli Daniele Conceição Beatriz Santos Raquel Cristina Marra Matheus Felipe Passos

The Paranaguá Estuarine Complex (PEC) is one of Brazil's largest southwest Atlantic estuarine systems, possessing a rich microalgae diversity that remains to be fully explored. Therefore, due to the increasing interest in the microalgae biotechnological potential, this study isolated and identified diatoms found in the PEC. The diatoms were purified and analyzed with light and scanning electron microscopy for morphological identification, while DNA sequences were used for molecular identification. Although a diatoms rich diversity was obtained, only a few were viable after the cultivation period. The two best-selected strains were identified as belonging to two genera, Nitzschia and Navicula. The rbcL region was found to be the most informative for species identification. Morphological and molecular analyses allowed for the identification of species Nitzschia inconspicua and Navicula pseudoantonii, which was understood as the first report of N. pseudoantonii in the American continent.

Navicula

Nitzschia

Identification

Morphology

10.1590/1678-4324-2023210523

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Three-way maximized net power output from alkaline membrane fuel cell stacks

International Journal of Hydrogen Energy (2023)

Paola Thalissa Bartoski Polla Rodrigo C. Raimundo Elise Sommer Watzko Lauber Martins Wellington Balmant

Dimensionless quantity

Constructal law

Stoichiometry

10.1016/j.ijhydene.2023.08.078

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DEVELOPMENT OF AN AIR HEATING AND HUMIDIFYING SYSTEM FOR MECHANICAL VENTILATION OF INTENSIVE CARE UNIT PATIENTS

Revista de Engenharia Térmica (2009)

Eliana Leal Ferreira JOSÉ VIRIATO COELHO VARGAS Marcos Carvalho Campos Fernando Dias Juan C. Ordóñez

The mechanical ventilators, also named artificial ventilators, are devices used in Intensive Care Units (ICU) for clinically critical patients. The equipment provides artificial breathing for the patient, creating favorable conditions for the patient recovery. It works as a system that is connected to the electric grid and two other networks, one supplies compressed air and the other supplies pure oxygen. Inside the equipment the gases are mixed, and then warmed up and humidified to be finally delivered to the patient. The existing system for treatment of the mixture is not effective, since it delivers the breathing air to the patient out of the normal physiology recommended range, i.e., temperature ~32-34°C and relative humidity ~80-95%. The objective of this work was to develop a new air heating and humidifying system for mechanical ventilation. First, it was built an air feeding system, composed by a compressor and an electronically controlled valve to simulate an actual mechanical ventilation system in the laboratory. A device for conditioning the air (temperature and humidity) was conceived and built for treating the air feeding system output air. The results of the laboratory measurements show that the developed equipment was capable of making the breathing air to reach the recommended ranges by the normal physiology.

Breathing gas

Air compressor

Artificial ventilation

Mechanical ventilator

Compressed air

10.5380/reterm.v8i1.61873

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Infrared image method for possible COVID-19 detection through febrile and subfebrile people screening

Journal of Thermal Biology (2022)

Marcos Leal Brioschi Carlos Dalmaso Neto Marcos de Toledo Eduardo Borba Neves JOSÉ VIRIATO COELHO VARGAS

10.1016/j.jtherbio.2022.103444

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Extensão Tecnológica Inovadora para o combate ao COVID-19 através da Iniciativa Startup Experience da UFPR

Extensão em Foco (2021)

Allana Resente Santos Isabella Stallbaum Schemiko Pauline Almeida Rosa Bernardo Davoglio Ricardo Ferreira Freitas

A metodologia interdisciplinar Iniciativa Startup Experience, desenvolvida no Projeto de Extensão Ciência para Todos, consiste na aplicação dos conceitos de ensino de aprendizado baseado em problemas e/ou projetos e focados para o desenvolvimento da inovação e empreendedorismo com alunos do ensino médio, graduação e pós-graduação relacionando-se com o setor produtivo e ecossistema de inovação local (município e estado). Desta forma, a equipe do projeto focou seus esforços na criação de soluções práticas para combate da pandemia COVID-19 através do uso de ferramentas digitais para o controle e monitoramento do acesso aos espaços de estudo ou trabalho. O produto final foi disponibilizado para a sociedade através de vídeo tutorial que permite o uso da solução através de ferramentas digitais gratuitas. Além disso, foram desenvolvidas: i) solução semi-automatizada a partir de VBA (Visual Basic for Applications) e ii) aplicativo para celulares. Alunos dos cursos de Farmácia, Engenharia Elétrica e Engenharia Química integraram uma nova startup denominada “CHECK Acesso Fácil”. Esse sistema está em teste no Hospital Veterinário da UFPR para fazer a gestão de todos os médicos veterinários residentes e demais funcionários. Desta forma, através deste trabalho interdisciplinar a partir da Metodologia Startup Experience, foi possível realizar a capacitação de alunos universitários com as competências de gestão de projeto, soft skills, inovação, empreendedorismo, interdisciplinaridade e extensão tecnológica inovadora com a criação de uma solução que permite, através do monitoramento de acessos, o controle da saúde de equipes de trabalho em empresas e, até mesmo, alunos e professores em universidades e escolas.

10.5380/ef.v0i23.80595

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Constructal Design of Animate and Inanimate Systems: An Answer to Consumerism?

Understanding complex systems (2012)

JOSÉ VIRIATO COELHO VARGAS

Consumerism

Industrial Revolution

Consumption

10.1007/978-1-4614-5049-8_10

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