WILSON APARECIDO PAREJO CALVO

(Fonte: Lattes)
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Possui graduação em Engenharia de Materiais Metálicos e Cerâmicos, pelo Departamento de Engenharia de Materiais da Universidade Federal de São Carlos - UFSCar (1987), Mestrado (1997) e Doutorado (2005) em Tecnologia Nuclear - Aplicações, pela Universidade de São Paulo - USP. Gerente do Centro de Tecnologia das Radiações (2001-2013) e Diretor de Administração e Infraestrutura (2014-2016) do Instituto de Pesquisas Energéticas e Nucleares - IPEN, e professor na World Nuclear University School on Radiation Technologies (2012 WNU-RT School). Tecnologista Sênior, professor e orientador de pós-graduação na área de Tecnologia Nuclear no IPEN/USP, coordenador de projetos da Agência Internacional de Energia Atômica - AIEA e Superintendente do IPEN (2017-2020), da Comissão Nacional de Energia Nuclear - CNEN. Membro do Conselho Curador da ABDAN, do Conselho Consultivo da ABENDI e da International Irradiation Association (iiA). Vice-Presidente do Conselho de Gestão da Incubadora de Base Tecnológica de São Paulo USP/IPEN-Cietec, tem experiência na área de Engenharia Nuclear, em Aplicações de Técnicas Nucleares na Indústria, Saúde, Agricultura e no Meio Ambiente, com ênfase em tecnologia de radioisótopos (radiotraçadores e fontes radioativas seladas) e das radiações ionizantes (feixe de elétrons, raios X e gama). Agraciado com o prêmio do Mérito Nuclear da ABDAN (2020) é Bolsista do CNPq - Produtividade em Desenvolvimento Tecnológico e Extensão Inovadora 2. (Texto extraído do Currículo Lattes em 27 dez. 2021)

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    Artigo IPEN-doc 28152
    Extraction of molybdenum from spent NiMo hydrocracking catalysts assisted by ionizing radiation
    2022 - KONDO, F.M.; DUARTE, C.L.; SOMESSARI, S.L.; SATO, M.I.; SALVADOR, V.L.R.; LIMA, N.B.; MARTINELLI, J.R.; CALVO, W.A.P.
    A catalyst is a substance that changes the rate of a reaction. In the petroleum industry, the catalysts are commonly used for fluid catalytic cracking and hydrocracking carried out with catalyst, each of them applied in a specific stage. These catalysts are used to facilitate the molecular chains cracking, which will generate a mixture of hydrocarbons. However, the catalyst gradually loses its activity, either by changing its original molecular structure or by its contamination from other petroleum molecules. The application of ionizing radiation (medium-energy electron beam) over these spent catalysts was studied to contribute the extraction of metals or rare-earths of high added-value. Tests conducted with hydrocracking catalysts were used the technique of electron beam irradiation (1.3 MeV) and had as a subject the extraction of molybdenum. Energy Dispersive X-ray analysis was performed on a Shimadzu EDX-720/800HS and X-ray Diffraction analysis on a Rigaku MultiFlex. Electron beam irradiation had a positive contribution if compared to traditional thermal and chemical methods. In temperature around 750 °C, hydrocracking irradiated catalysts of the lower region have an extraction of molybdenum (MoO3) yield twice higher compared to non-irradiated ones, in other words 57.65% and 26.24%, respectively.
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    Artigo IPEN-doc 24392
    Tomographic 2-D gamma scanning for industrial process troubleshooting
    2018 - HARAGUCHI, MARCIO I.; CALVO, WILSON A.P.; KIM, HAE Y.
    Gamma scanning is a nuclear inspection technique widely used to troubleshoot industrial equipments in refineries and petrochemicals plants such as distillation columns and reactors. In this technique, a sealed radiation source and detector move along the equipment, and the intensity readouts generate the density profile of the equipment. Although many improvements have been introduced in recent years, the result of gamma scan still consists of a simple 1-D density plot. In this work, we present the tomographic gamma scanning that, using image reconstruction techniques, shows the result as a 2-D image of density distribution. Clearly, an image reveals more features of the equipment than a 1-D graph and many problems that could not be troubleshooted using the conventional technique can now be solved with this imaging technique. We use ART (Algebraic Reconstruction Technique) intercalated with total variation minimization filter. The use of total variation minimization leads to compressive sensing tomography, allowing to obtain good quality reconstruction from few irradiation data. We simulated the reconstruction of different density distributions. We applied the new technique to data obtained by irradiating with gamma rays phantoms that emulate industrial equipments. Finally, we present the result obtained by applying the innovative technique to real operating distillation column. It seems that the new technique has identified a problem in this equipment that is very difficult to detect using conventional gamma scan.