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  • IPEN-DOC 29567

    MOREIRA, TATIANA M. ; ULRICH, JOAO C. ; GENOVA, LUIS A. . Adsorção em coluna de leito fixo com microesferas de alumina aplicadas no tratamento de efluente contendo metais pesados. In: ENCONTRO TÉCNICO AESABESP, 33.; CONGRESSO NACIONAL DE SANEAMENTO E MEIO AMBIENTE; FEIRA NACIONAL DE SANEAMENTO E MEIO AMBIENTE, 13-15 de setembro, 2022, São Paulo, SP. Anais... São Paulo, SP: AESABESP - Associação dos Engenheiros da Sabesp, 2022. p. 1-7.

    Abstract: Metais pesados estão entre os poluentes mais danosos para o meio ambiente e para o ser humano. Estão presentes em diversos processos industriais, exigindo tratamentos mais eficientes para que os efluentes gerados estejam em níveis aceitáveis antes do descarte. A adsorção é uma técnica amplamente empregada por sua eficiência e baixo custo. Neste trabalho foram confeccionadas pelo método de gelificação interna, microesferas de alumina porosa, pura e dopada com sílica, visando a otimização do tratamento do efluente aquoso contendo Zn, Ni e Mn, proveniente do processo de fosfatização tricatiônica de carrocerias empregado na indústria automotiva. As microesferas calcinadas a 600ºC e 700°C foram caracterizadas quanto à distribuição de tamanhos, área de superfície específica (BET), adsorção gasosa (BJH), difração de raios X (DRX) e microscopia eletrônica de varredura (MEV). Para o tratamento do efluente em coluna de leito fixo, preenchida com as microesferas, avaliou-se o efeito da vazão. A concentração dos metais pesados, ao longo dos ensaios, foi analisada por espectrometria de emissão ótica por plasma acoplado (ICP-OES). Como resultado, obteve-se mais de 90% de adsorção destes metais pesados, em regime de coluna de leito fixo, indicando alta eficiência das microesferas de alumina como adsorventes destes íons de metais pesados.

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  • IPEN-DOC 29566

    FERRAZ, RENATO R.N.; BARNABE, ANDERSON S.; QUONIAM, LUC; AQUINO, SIMONE . World panorama of sporotrichosis patent deposit and use of patent information for problem solving in underdeveloped countries scenario. In: INTERNATIONAL CONFERENCE ON INFORMATION SYSTEMS AND TECHNOLOGY MANAGEMENT, 18th, October 13-15, 2021, Online. Proceedings... São Paulo, SP: TECSI - FEA/USP, 2021. p. 1-15. DOI: 10.5748/18CONTECSI/PSE/DSC/6744

    Abstract: Sporotrichosis is a neglected disease occurring worldwide, described as an occupational risk disease, affecting farmers, gardeners, and agricultural workers. Patents have territorial restrictions, being valid only in countries that have granted a patent license, which allows their free reproduction in countries where protection has not been extended. The use of tools that extract, organize, analyze and allow the targeted selection of interest documents can contribute to solution of problems in technologically less developed countries. This study aims to analyze the main patents related to diagnosis of sporotrichosis on Espacenet, a patent base with more than 120 million documents, seeking to select free documents for exploitation, with low cost of reproduction, and that can be used to at least minimize problems related to sporotrichosis. Patent2net, an open-source patent collector, was used to search in Espacenet, a database with more than 120 million of patents, documents that will be freely applied in Brazil. We identify a Taiwanese patent related to a kit for rapid detection of Sporothrix infection, that can be freely manufactured Brazil and other underdeveloped countries. The technometric analysis performed with P2N can be replicated by any interested in search of technological solutions for numerous problems, especially in poor countries.

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  • IPEN-DOC 29534

    RODRIGUES, ELAINE A. ; CARVALHO, AMANDA R. ; AQUINO, AFONSO R. de ; ANDRADE, DELVONEI A. de ; BUSTILLOS, JOSE O.W.V. ; VICTOR, RODRIGO A.B.M.; REZENDE, VERONICA B.S. de. Water and climate in megacities and the contribution of nuclear science and technology to ecosystems and their services. In: INTERNATIONAL CONFERENCE ON WATER, MEGACITIES AND GLOBAL CHANGE, 2nd, January 11-14, 2022, Online. Proceedings... Paris, France: United Nations Educational, Scientific and Cultural Organization - UNESCO, 2022. p. 687-697.

    Abstract: The loss of the services provided by ecosystems affects the well-being of people and compromises development in its multiple dimensions. In megacities, the promotion of human well-being and the conservation and restoration of ecosystems and their services are urgent global challenges, especially as a function of the growing expansion of water scarcity and its tendency to worsen due to the effects of climate change. This article addresses the growing use and application of nuclear science and technology for the conservation, assessment, and restoration of ecosystems and their services. It focus on water security and climate change, and on how this contributes to the fulfillment of the Sustainable Development Goals (SDGs). Tools based on nuclear science provide solutions for the development of "climate-smart" agricultural methods; the study of terrestrial, aquatic and atmospheric systems; monitoring how climate change affects the environment and GHG routes, and their distribution and impact on ecosystems, among other aspects. Nuclear technologies are used for wastewater treatment, identification of pollution sources, studies on the quality and quantity of water resources, and adaptation to climate change. The demystification of nuclear science and technology and the increase in collaboration between the ecosystem services and nuclear areas, and society as a whole, are fundamental for facing the global challenges related to water and climate in large cities.

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  • IPEN-DOC 29533

    VICTOR, RODRIGO A.B.M.; RODRIGUES, ELAINE A. ; ROCHA, GUSTAVO C. da; LUCA, EDGAR F. de; METZGER, JEAN P.; CARVALHO, AMANDA R. de; BICUDO, DENISE. São Paulo City Green Belt Biosphere Reserve: water security and human well-being. In: INTERNATIONAL CONFERENCE ON WATER, MEGACITIES AND GLOBAL CHANGE, 2nd, January 11-14, 2022, Online. Proceedings... Paris, France: United Nations Educational, Scientific and Cultural Organization - UNESCO, 2022. p. 1160-1170.

    Abstract: The green belt surrounding São Paulo and Santos metropolises, designated by UNESCO as the São Paulo City Green Belt Biosphere Reserve - GBBR (1994), encompasses a population of 25,4 million people in a region responsible for nearly 20% of Brazilian GDP. With approximately 2,33 million hectares, the biosphere reserve and its inner urban area (220 thousand hectares) are host to expressive terrestrial and marine biodiversity, typical to the Atlantic Forest and Cerrado biomes. This paper presents the biosphere reserve as a water security territory: it provides around 90% and 100% of the water flows supplying São Paulo and Santos metropolises, respectively. Representing only 7,36% of São Paulo State territory, the GBBR harbors over 70% of the state´s volume for public supply. Spatial analysis shows that most of this volume comes from a few protected areas that act as hydric hotspots. During 2013-2015 Southeastern Brazil and especially São Paulo faced a severe shortage in rainfall that posed threats to the metropolitan water supply, leading to important reflections about the region´s hydric vulnerability. Combining classical built infrastructure with ecological infrastructure (conservation, restoration and sustainable use of its ecosystems) is paramount to ensure the populationʼs water security in the medium and long terms. In this sense, the geographical and conceptual frameworks constituted by the GBBR can provide integrated land management solutions for improving water supply in quantity and quality for such a complex and critical territory.

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  • IPEN-DOC 29532

    RODRIGUES, ELAINE A. ; CARVALHO, AMANDA R. ; CARVALHO, BEATRIZ R.; AQUINO, AFONSO R. de ; MENDONCA, RODRIGO A. de A.; SODRE, MARCELO G.. Megacities, climate vulnerability and environmental displacement: interdependent challenges. In: INTERNATIONAL CONFERENCE ON WATER, MEGACITIES AND GLOBAL CHANGE, 2nd, January 11-14, 2022, Online. Proceedings... Paris, France: United Nations Educational, Scientific and Cultural Organization - UNESCO, 2022. p. 1149-1159.

    Abstract: Climate change and urbanization are the biggest challenges to be faced by humanity. Between 1950 and 2005, global carbon emissions from fossil fuel burning increased by almost 500% while the level of urbanization increased from 29% to 49%. Urban growth is one of the main factors that cause the increase of natural habitat loss on the planet, which affects the capacity of ecosystems to meet the vital needs of millions of people, including the growing number of international migrants, who are strongly directed to urban areas. Considering the trend of intensification of the effects of climate change, this study assesses the interdependence between urbanization, climate vulnerability and environmental displacement in the megacities of the world, based on the simulation of sea level rise in megacities. Although climate change is a global issue, it is also a local concern, since urban areas play a crucial role in the climate change scenario. As migration policies and urbanization are considered separately, megacities are spaces of high vulnerability, notably given the effects of climate change, and demand the development of coordinated responses to tackle them.

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  • IPEN-DOC 29531

    SILVA, ANDERSON M.B.; RODRIGUES, DANIEL S.; ANTONIO, PATRICIA L. ; JUNOT, DANILO O.; CALDAS, LINDA V.E. ; SOUZA, DIVANIZIA N.. Investigation of dosimetric properties of CaSO4:Mn phosphor prepared using slow evaporation route. In: INTERNATIONAL SYMPOSIUM ON SOLID STATE DOSIMETRY, 22nd., September 19-23, 2022, Zacatecas, Mexico. Proceedings... Zacatecas, Mexico: Sociedad Mexicana de Irradiacion y Dosimetria, 2022. p. 145-170.

    Abstract: The objective of this work was to investigate the luminescent properties of CaSO4:Mn synthesized by slow evaporation route. The crystalline structure, morphology, thermal and optical properties of the phosphors were characterized by X-ray diffraction analysis (XRD), Scanning electron microscopy (SEM), photoluminescence (PL) and thermogravimetric analysis (TGA). Moreover, using thermoluminescence (TL) and optically stimulated luminescence (OSL) techniques, the dosimetric properties of the phosphors, such as emission spectra, glow curve reproducibility, dose-response linearity, fading of the luminescent signal, variation of the TL intensity with the heating rate, OSL decay curves, correlation between TL and OSL emissions and minimum detectable dose (MDD) were comprehensively investigated. For dosimetric analyses, the samples were irradiated with doses from 169 mGy to 10 Gy. The emission band fits with the characteristic line of the Mn2+ emission features, ascribed to 6A1→4T1 transition. CaSO4:Mn pellets present a TL glow curve with a single typical peak centered around 494 nm, an OSL decay curve with predominance of a fast decay component, and a MDD on the order of hundreds of mGy. The luminescent signals showed to be linear and reproducible in the studied dose range. The trapping centers located between 0.83 eV and 1.07 eV were revealed for different heating rates in the TL study. The high TL sensitivity of CaSO4:Mn was proven when comparing with commercially available dosimeters. The luminescent signals exhibit a smaller fading than described in the literature for CaSO4:Mn produced by other methods.

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  • IPEN-DOC 29527

    SIMOES, A.M.P.; SILVA, R.M.P. ; SUFFREDINI, H.B.; SANTOS, L.F.; BASTOS, I.N.. Naphthenic corrosion using electrochemical and analytical techniques. In: JORNADAS DE CORROSÃO E PROTEÇÃO DE MATERIAIS, 8th, November 24, 2022, Lisboa, Portugal. Proceedings... Lisboa, Portugal: LNEG - Laboratório Nacional de Energia e Geologia, 2022. p. 29-30. DOI: 10.34637/4cw4-w798

    Abstract: Naphthenic acid corrosion of steel was studied in a stagnant, biphasic oil/aqueous phase system, by means of electrochemical measurements and surface analysis. Corrosion was restricted to the region of the aqueous phase, as crater-shaped pits that eventually coalesced, generating a nearly uniform attack in the vicinity of the oil phase. In-situ electrochemical impedance spectroscopy (EIS) reveals the processes occurring at the aqueous phase, which nevertheless increase with the fraction of oil phase and with degree of acidity of the oil.

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  • IPEN-DOC 29526

    ARAUJO, LEANDRO G. de; CAMPERA, ALEXSSANDRA A.A. ; MARUMO, JULIO T. ; GUILHEN, SABINE N. . Methylene blue biosorption by bone meal using experimental design. In: ENCONTRO BRASILEIRO SOBRE ADSORÇÃO, 14., 23-25 de novembro, 2022, Brasília, DF. Anais... Recife, PE: Even3, 2022.

    Abstract: This study aims at expanding the knowledge on the applicability of bone meal powder (BMP), and assess its potential as an adsorbent material for methylene blue (MB) removal, a toxic textile dye. BMP is a low-cost material still little studied for the adsorption of contaminants in aqueous media. In this work, we employed the 2k experimental design (k = 3) to systematically explore the most important process parameters, which were pH of the MB solution, initial MB concentration in solution and biosorbent dosage (mass of biosorbent/volume of contaminated solutions).

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  • IPEN-DOC 29525

    GUILHEN, SABINE N. ; MARTINS, GABRIEL F. ; MARUMO, JULIO T. ; ARAUJO, LEANDRO G. de. Anionic dye removal from aqueous solutions using standard biochars: preliminary study. In: ENCONTRO BRASILEIRO SOBRE ADSORÇÃO, 14., 23-25 de novembro, 2022, Brasília, DF. Anais... Recife, PE: Even3, 2022.

    Abstract: One of the most serious problems related to water pollution by the textile, plastics, leather and food industries, among others, is the emission of aqueous effluents containing dyes. The most commercially used dyes are resistant to biodegradation, photodegradation and the action of oxidizing agents. The presence of dyes in water bodies can significantly and adversely affect the photosynthesis of aquatic plants by reducing the penetration of sunlight. In addition, they can be toxic to certain forms of aquatic life. Treatment of aqueous effluents containing dyes can involve a variety of materials and techniques, of which adsorption stands out for its simplicity, low cost and efficiency. In this study, standard biochars derived from wheat straw (WSP), oil seed rape straw (OSR) and Miscanthus straw (MSP), obtained at two different pyrolytic temperatures (550 °C and 700 °C), were investigated as adsorptive materials for remazol black (RB) dye. Maximum adsorption capacities were obtained at a dosage of 5 g L-1 for most of the BCs, except for MSP550, for which the dosage of 10 g L-1 achieved the highest performance. pH effect indicated that most of the adsorptive functionalities of the BCs are favored at pH 5. The steps currently in progress refer to the experimental design for the optimization of adsorption parameters and will be added in the full paper.

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  • IPEN-DOC 29523

    NASCIMENTO, G. ; CAMPOS, L.L. ; CAMPOS, V.P. . Characterization of the reproducibility of LiF:Mg, Ti dosimeters and the radiator system in the quantity Hp(0.07). In: EUROPEAN RADIATION PROTECTION WEEK, October 9-14, 2022, Estoril, Portugal. Proceedings... 2022.

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  • IPEN-DOC 29522

    SOUZA, L.P.; JESUS, J.M.S.; TOMINAGA, F.K. ; RAMOS, B.; BORRELY, S.I. ; TEIXEIRA, A.C.S.C.. Investigation of persulfate-based AOPs to decontaminate water with a mixture of fluoxetine and levonorgestrel. In: IBEROAMERICAN CONFERENCE ON ADVANCED OXIDATION TECHNOLOGIES, 5th, November 7-11, 2022, Cusco, Peru. Proceedings... 2022. p. 242-243.

    Abstract: This work reports a study on two forms of persulfate activation (solar irradiation and anodic oxidation-AO) for the degradation of active pharmaceutical ingredients (APIs). A solution containing a mixture of levonorgestrel and fluoxetine ([LNG]0 = 0.29 ± 0.03 mg L-1; [FLX]0 = 5.02 ± 0.34 mg L-1) was treated with persulfate ([PS]0 = 0.07 mol L-1) and irradiated or electrolyzed for 60 min under similar conditions. The results revealed similar decays of APIs in the two activation forms studied, solar/PS (k LNG = 6.6 × 10-2 min-1; k FLX = 7.7 × 10-2 min-1) and AO/PS (k LNG = 7.8 × 10-2 min-1; k FLX = 9.7 × 10-2 min-1), with slightly better results for the electrochemical process. However, acute toxicity accessed with Daphnia similis indicated that AO/PS provided a three-fold increase in the values of toxic units.

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  • IPEN-DOC 29365

    SILVA, ABDENEGO R. da ; CABRAL, FERNANDA V. ; FONTES, ADRIANA; RIBEIRO, MARTHA S. . Light-based antifungal strategy for the control of Candida auris. In: LATIN AMERICA OPTICS AND PHOTONICS CONFERENCE, August 7-11, 2022, Recife, PE. Proceedings... Washington, DC, USA: Optica Publishing Group, 2022. DOI: 10.1364/LAOP.2022.W4A.58

    Abstract: Candida auris is a pathogen that has been attracting worldwide focus due to its high resistance to conventional drugs. This work evaluated the photodynamic inactivation mediated by two phenothiazine dyes against the CBS 10913 strain.

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  • IPEN-DOC 29364

    FAROOQ, SAJID ; CARAMEL-JUVINO, AMANDA ; FONTES, YASMIN R. ; GARDIANO, SABRINA A. ; ZEZELL, DENISE M. . Exploring enamel demineralization from SEM images using deep learning algorithms. In: LATIN AMERICA OPTICS AND PHOTONICS CONFERENCE, August 7-11, 2022, Recife, PE. Proceedings... Washington, DC, USA: Optica Publishing Group, 2022. DOI: 10.1364/LAOP.2022.W4A.36

    Abstract: Here, we employ segmentation and convolutional neural network (CNN) to identify and quantify enamel demineralization. Our results depict that CNN model using input SEM images achieve accuracy up to 79% for enamel demineralization diagnosis.

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  • IPEN-DOC 29363

    COSTA, PRISCILA ; STIPP, WAGNER ; VICENTE, ROBERTO ; MACHADO, NOE G.P. ; RAELE, MARCUS P. . Study on the potential of laser ablation to decontaminate radioactive waste. In: LATIN AMERICA OPTICS AND PHOTONICS CONFERENCE, August 7-11, 2022, Recife, PE. Proceedings... Washington, DC, USA: Optica Publishing Group, 2022. DOI: 10.1364/LAOP.2022.W3B.2

    Abstract: Laser is a promising tool to decontaminate radioactive waste that is impregnated with radionuclides on its surface, the decontamination process has no chemical inputs, and the pollutants can be fixed in HEPA filters. The current study aimed to test a wide range of samples using 10 different materials and fluences ranging from 1 to 10 J/cm2.

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  • IPEN-DOC 29362

    JIMENEZ-VILLAR, ERNESTO ; MARTINS, WELITON S.; WETTER, NIKLAUS U. . Light diffraction in ordered photonics colloidal suspensions. In: LATIN AMERICA OPTICS AND PHOTONICS CONFERENCE, August 7-11, 2022, Recife, PE. Proceedings... Washington, DC, USA: Optica Publishing Group, 2022. DOI: 10.1364/LAOP.2022.W1D.5

    Abstract: Light diffraction measurements show order in photonic colloidal suspensions of scatterers. Strong and long-range Coulomb interaction explains the order and correlation in the scatterers’ (TiO2@Silica) position, which favors significantly the localization (interference) of light.

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  • IPEN-DOC 29361

    JIMENEZ-VILLAR, ERNESTO ; GOMES, ANDERSON A.V.; WETTER, NIKLAUS U. ; DIPOLD, JESSICA ; MESTRE, VALDECI; DOMINGUEZ, CHRISTIAN T.. Random laser in ordered colloidal suspensions. In: LATIN AMERICA OPTICS AND PHOTONICS CONFERENCE, August 7-11, 2022, Recife, PE. Proceedings... Washington, DC, USA: Optica Publishing Group, 2022. DOI: 10.1364/LAOP.2022.W1B.2

    Abstract: Random lasing is achieved in an ordered photonic colloidal (TiO2@Silica) suspension. Stronger correlation in the scatterers’ (TiO2@Silica) position, induced by stronger and longer-range Coulomb interaction improves light localization and random laser performance.

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  • IPEN-DOC 29360

    FAROOQ, SAJID ; DEL-VALLE, MATHEUS ; SANTOS, SOFIA ; BERNARDES, EMERSON S. ; ZEZELL, DENISE M. . Identifying breast cancer cell lines using high performance machine learning methods. In: LATIN AMERICA OPTICS AND PHOTONICS CONFERENCE, August 7-11, 2022, Recife, PE. Proceedings... Washington, DC, USA: Optica Publishing Group, 2022. DOI: 10.1364/LAOP.2022.Tu5A.3

    Abstract: We present a computational framework based on machine learning classifiers K-Nearest Neighbors and Neighborhood Component analysis for breast cancer (BC) subtypes prognostic. Our results has up to 97% accuracy for prognostic stratification of BC subtypes.

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  • IPEN-DOC 29359

    MACHADO, NOE G.P. ; ROSERO, WILMMER A.A. ; ROSSI, WAGNER de ; RAELE, MARCUS P. . Femtosecond production of gold nanoparticles suitable for nanobrachytherapy. In: LATIN AMERICA OPTICS AND PHOTONICS CONFERENCE, August 7-11, 2022, Recife, PE. Proceedings... Washington, DC, USA: Optica Publishing Group, 2022. DOI: 10.1364/LAOP.2022.Tu4A.53

    Abstract: The present work approaches the production of AuNPs through femtosecond laser ablation of a solid in a liquid media. Aiming at oncological applications, the stabilization of the colloidal solution was performed with non-cytotoxic material.

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  • IPEN-DOC 29358

    ZUFFI, ARMANDO V.F. ; MALDONADO, EDISON P.; VIEIRA JUNIOR, NILSON D. ; SAMAD, RICARDO E. . Time-resolved femtosecond laser-plasma measurements by a Mach-Zehnder-like interferometer. In: LATIN AMERICA OPTICS AND PHOTONICS CONFERENCE, August 7-11, 2022, Recife, PE. Proceedings... Washington, DC, USA: Optica Publishing Group, 2022. DOI: 10.1364/LAOP.2022.Tu4A.49

    Abstract: This work reports measurements of the density profile of laser-generated plasmas by a home-built time-resolved Mach-Zehnder-like interferometer. This device will integrate our laboratory infrastructure for laser wakefield acceleration experiments.

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  • IPEN-DOC 29357

    PRADO, FELIPE M. ; VIEIRA, TARCIO de A. ; WETTER, NIKLAUS U. . 68% slope efficiency Nd:YLF laser with 91 W of peak power. In: LATIN AMERICA OPTICS AND PHOTONICS CONFERENCE, August 7-11, 2022, Recife, PE. Proceedings... Washington, DC, USA: Optica Publishing Group, 2022. DOI: 10.1364/LAOP.2022.Tu4A.47

    Abstract: We demonstrate two highly efficient Nd:YLiF4 lasers, achieving the highest efficiencies for Nd:YLF side-pumped at 800 nm.

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  • IPEN-DOC 29356

    BORDON, CAMILA D.S.; DIPOLD, JESSICA ; BARRETO, LUIZ M.M.; WETTER, NIKLAUS U. ; ROSSI, WAGNER de ; KASSAB, LUCIANA R.P.. Effect of silver nanoparticles on the production of double line waveguide written by fs laser on Nd3+ doped GeO2-PbO glasses. In: LATIN AMERICA OPTICS AND PHOTONICS CONFERENCE, August 7-11, 2022, Recife, PE. Proceedings... Washington, DC, USA: Optica Publishing Group, 2022. DOI: 10.1364/LAOP.2022.Tu4A.41

    Abstract: We report the production of double waveguides in Ge2O-PbO glasses doped with Nd3+ and silver nanoparticles by direct femtosecond laser writing. The beam quality measurements and refractive index change are presented.

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  • IPEN-DOC 29355

    CABRAL, FERNANDA V. ; LIAN, CHENG; PERSHEYEV, SAYDULLA; SAMUEL, IFOR D.W.; RIBEIRO, MARTHA S. . Organic light-emitting diodes as wearable light sources for antiparasitic photodynamic therapy. In: LATIN AMERICA OPTICS AND PHOTONICS CONFERENCE, August 7-11, 2022, Recife, PE. Proceedings... Washington, DC, USA: Optica Publishing Group, 2022. DOI: 10.1364/LAOP.2022.Tu4A.39

    Abstract: Herein, we used a photosensitizing agent and red organic light-emitting diodes (OLEDs) against two strains of Leishmania amazonensis amastigotes, including a drug-resistant line. OLEDs are promising wearable light sources for photodynamic therapy of cutaneous leishmaniasis.

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  • IPEN-DOC 29354

    SILVA, CAMILA R. ; RIBEIRO, MARTHA S. . Bimodal treatment for triple-negative breast cancer by combining optical and gamma radiation. In: LATIN AMERICA OPTICS AND PHOTONICS CONFERENCE, August 7-11, 2022, Recife, PE. Proceedings... Washington, DC, USA: Optica Publishing Group, 2022. DOI: 10.1364/LAOP.2022.Tu4A.38

    Abstract: Triple-negative breast cancer is resistant to chemo and radiation therapy. Light-based technologies have been reported as promising allies to cancer treatment. Herein, we combined photodynamic and gamma therapies to verify their potential to treat TNBC.

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  • IPEN-DOC 29353

    DIPOLD, JESSICA ; BERECZKI, ALLAN ; PINHEIRO, GUSTAVO; VASCONCELOS, KAMILLA; FREITAS, ANDERSON Z. de ; WETTER, NIKLAUS U. . Raman Spectroscopy of irradiated and non-irradiated plastics. In: LATIN AMERICA OPTICS AND PHOTONICS CONFERENCE, August 7-11, 2022, Recife, PE. Proceedings... Washington, DC, USA: Optica Publishing Group, 2022. DOI: 10.1364/LAOP.2022.Tu4A.10

    Abstract: Understanding radiation damage to plastic is of great interest for possible construction applications. Two different plastics were gamma irradiated and their property changes were studied with micro-Raman spectroscopy, showing promising results in increasing its toughness.

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  • IPEN-DOC 29352

    MALDONADO, EDISON P.; SAMAD, RICARDO E. ; ZUFFI, ARMANDO V.F. ; VIEIRA JUNIOR, NILSON D. . Simulation of a laser wakefield accelerator in downramp injection regime suitable for high repetition rates. In: LATIN AMERICA OPTICS AND PHOTONICS CONFERENCE, August 7-11, 2022, Recife, PE. Proceedings... Washington, DC, USA: Optica Publishing Group, 2022. DOI: 10.1364/LAOP.2022.Tu1C.7

    Abstract: We discuss the results of simulating a laser wakefield accelerator in the 50 MeV range suitable for repetition rates > 10 Hz using commercial lasers and compare with other approaches for this purpose.

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  • IPEN-DOC 29351

    ZUFFI, ARMANDO V.F. ; VIEIRA JUNIOR, NILSON D. ; SAMAD, RICARDO E. . Observation of third-harmonic saturation in helium due to ionization depletion. In: LATIN AMERICA OPTICS AND PHOTONICS CONFERENCE, August 7-11, 2022, Recife, PE. Proceedings... Washington, DC, USA: Optica Publishing Group, 2022. DOI: 10.1364/LAOP.2022.Th1B.7

    Abstract: We report the saturation of the third harmonic generated in Helium by ultrashort laser pulses, and describe the observed plateau based on the depletion of the electrons generating the harmonics in a restricted interaction volume.

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  • IPEN-DOC 29350

    BERECZKI, ALLAN ; WETTER, NIKLAUS . Compact, high-power, single-frequency, dynamically stable cw ring laser. In: LATIN AMERICA OPTICS AND PHOTONICS CONFERENCE, August 7-11, 2022, Recife, PE. Proceedings... Washington, DC, USA: Optica Publishing Group, 2022. DOI: 10.1364/LAOP.2022.Th1B.4

    Abstract: We recently reported a single-frequency Nd:YAG ring laser with 55.6 W CW output. In this work our design equations are given in order to obtain compactness and increasing resonator free spectral range.

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  • IPEN-DOC 29349

    JIMENEZ-VILLAR, ERNESTO ; WETTER, NIKLAUS U. ; DIPOLD, JESSICA ; MARQUES, FRANCISCO C.. Localization of light: a power sensing tool. In: LATIN AMERICA OPTICS AND PHOTONICS CONFERENCE, August 7-11, 2022, Recife, PE. Proceedings... Washington, DC, USA: Optica Publishing Group, 2022. DOI: 10.1364/LAOP.2022.Th1A.7

    Abstract: Localization of light induced by correlation in the scatterers’ positions is achieved in an ordered photonic colloidal (TiO2@Silica) suspension. A strongly enhanced light-matter coupling is observed as the concentration of TiO2@Silica is increased above threshold.

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  • IPEN-DOC 29348

    GOMES, ANTONIO A. ; VIANNA JUNIOR, ARDSON dos S.; MOREIRA, GREGORI de A.; LANDULFO, EDUARDO ; SAMAD, RICARDO E. ; BERNARDES, EMERSON S. ; ROSSI, WAGNER de . Determination of parameters for micromachining of microfluidic mixers with complex geometry in glass using ultra-short laser pulse. In: LATIN AMERICA OPTICS AND PHOTONICS CONFERENCE, August 7-11, 2022, Recife, PE. Proceedings... Washington, DC, USA: Optica Publishing Group, 2022. DOI: 10.1364/LAOP.2022.M4C.2

    Abstract: Femtosecond laser micromachining was adopted to make a glass mixer with complex geometry. This special design promotes more efficient mixing in microreactor with gas-liquid flux at low flow rates, compared to conventional serpentine mixers.

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  • IPEN-DOC 29347

    ROSSI, WAGNER de ; GOMES, ANTONIO A. ; SAMAD, RICARDO E. ; MACHADO, ALISSON R.; CHELIGA, PEDRO A.B.. Ultrashort laser pulse microtexturing on cutting tools. In: LATIN AMERICA OPTICS AND PHOTONICS CONFERENCE, August 7-11, 2022, Recife, PE. Proceedings... Washington, DC, USA: Optica Publishing Group, 2022. DOI: 10.1364/LAOP.2022.M4C.1

    Abstract: Femtosecond laser pulses were used for texturing cutting tools in order to obtain better results in the traditional metal turning process. Some significant examples are presented in this work.

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  • IPEN-DOC 29346

    DEL-VALLE, MATHEUS ; SANTOS, MOISES O. dos ; BERNARDES, EMERSON S. ; ZEZELL, DENISE M. . Breast cancer subtype classification using a one-dimensional convolutional neural network in hyperspectral images. In: LATIN AMERICA OPTICS AND PHOTONICS CONFERENCE, August 7-11, 2022, Recife, PE. Proceedings... Washington, DC, USA: Optica Publishing Group, 2022. DOI: 10.1364/LAOP.2022.M4B.5

    Abstract: FTIR spectroscopy imaging in addition to deep learning is a potential tool for breast cancer subtype classification, where accuracies higher than 86% can be achieved to predict among all subtypes.

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  • IPEN-DOC 29345

    FERREIRA, MARIA C.C.; MONTEIRO, GABRIELA R.; PERALTA, FELIPE; CASTRO, PEDRO A.A. ; ZEZELL, DENISE ; NOGUEIRA, MARCELO S.; CARVALHO, LUIS F.C.S.. Assessment of bound water of saliva samples by using FT-IR spectroscopy. In: LATIN AMERICA OPTICS AND PHOTONICS CONFERENCE, August 7-11, 2022, Recife, PE. Proceedings... Washington, DC, USA: Optica Publishing Group, 2022. DOI: 10.1364/LAOP.2022.M4B.1

    Abstract: The objective of the present work is to show the relationship of the high-wavenumber spectral region concern OH vibrations, which show in a way how bound water can be altered in different sample groups.

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  • IPEN-DOC 29344

    CASTRO, PEDRO A.A. de ; DIAS, DERLY A. ; VELOSO, MARCELO N. ; ZEZELL, DENISE M. . Bone as a biomarker for detecting low dose of ionizing radiation: a pilot study. In: LATIN AMERICA OPTICS AND PHOTONICS CONFERENCE, August 7-11, 2022, Recife, PE. Proceedings... Washington, DC, USA: Optica Publishing Group, 2022. DOI: 10.1364/LAOP.2022.M2B.4

    Abstract: FTIR spectroscopy was able to discriminate bone samples receiving low-dose ionizing radiation doses (0.002 kGy, 0.004 kGy, 0.007 kGy), offering valuable insights in view of the understanding of radiation dose response in biological systems.

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  • IPEN-DOC 29343

    SILVA, D.V. ; USSUI, V. ; SOUZA, R.F.B. de ; OLIVEIRA NETO, A. ; OTUBO, L. ; FARIA JUNIOR, R.N. ; LAZAR, D.R.R. . Síntese de nanoestruturas de grafeno por esfoliação química de grafite para aplicação em eletrodos de supercapacitores / Synthesis of graphene nanostructures by chemical exfoliation of graphite for application in supercapacitor electrodes. In: CONGRESSO BRASILEIRO DE CERÂMICA, 65-66., 6-9 de junho, 2022, Águas de Lindóia, SP. Anais... São Paulo, SP: Associação Brasileira de Cerâmica - ABCERAM, 2022. p. 559-570.

    Abstract: O presente trabalho tem como objetivo o estudo de um processo de síntese de nanoestruturas à base de grafeno para aplicação em supercapacitores. Os materiais foram sintetizados a partir do método de esfoliação química (método de Hummers aprimorado por Marcano), seguido de redução química e térmica do óxido de grafeno gerado com ácido ascórbico, forno à vácuo e micro-ondas, respectivamente. Avaliou-se também o efeito da presença de ureia como agente dopante de nitrogênio. Estes materiais foram caracterizados por: análise termogravimétrica, fluorescência de raios X, difração de raios X e microscopia eletrônica de transmissão. Os materiais sintetizados foram utilizados como material ativo para eletrodos de supercapacitores que foram caracterizados eletricamente por voltametria cíclica. Os resultados obtidos indicaram que a metodologia de síntese adotada foi efetiva para obtenção do material desejado, propiciando estabilidade dos supercapacitores. A dopagem de nitrogênio com ureia se mostrou eficiente para aumentar a capacitância desses dispositivos.

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  • IPEN-DOC 29342

    GOMES, D.S. ; OLIVEIRA, F.B.V. . Avaliação de combustível cerâmicos compostos baseados em urânio, tório e plutônio para reatores nucleares / Evaluation of composed ceramic fuels based on uranium, thorium, and plutonium for nuclear reactor. In: CONGRESSO BRASILEIRO DE CERÂMICA, 65-66., 6-9 de junho, 2022, Águas de Lindóia, SP. Anais... São Paulo, SP: Associação Brasileira de Cerâmica - ABCERAM, 2022.

    Abstract: The energy generated using thorium as nuclear fuel is an attractive way to preserve the uranium reserves and reduce the radiotoxicity wastes. Today, global thorium reserves are around four times that of uranium reserves, and ThO2 is cheaper than UO2. The next generation of reactor shows fast reactor types using (U-Pu)O2. It contains combinations of ceramic fuels based on UO2, PuO2, and ThO2. Using a new version of the FRAPCON code, get the ability to predict thorium fuels. The FRAPCON fuel codes permit the addition of capacity to simulate thorium fuel and compare fuel performance with standard UO2. The proposed strategy uses ThO2 75 wt% composed of UO2 25 wt% with enrichment equal to 19.5 wt%. In comparison, the second strategy uses a balanced composition of ThO2 at 93 wt.% combined with PuO2 at 7.0 wt.%.

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  • IPEN-DOC 29341

    GOMES, D.S. ; OLIVEIRA, F.B.V. . Combustível composto avançado UO2-UN com condutividade térmica melhorada e alta densidade / Advanced composite fuel UO2–UN with enhanced thermal conductivity and high density. In: CONGRESSO BRASILEIRO DE CERÂMICA, 65-66., 6-9 de junho, 2022, Águas de Lindóia, SP. Anais... São Paulo, SP: Associação Brasileira de Cerâmica - ABCERAM, 2022.

    Abstract: Today, many efforts focus on ceramic fuels that can replace standard uranium dioxide (UO2). In this context, uranium nitride (UN) could replace UO2 used in light water reactors (LWRs). The UN fuel has a higher uranium density and better thermal conductivity than UO2. The drawback of UN is a lower oxidation resistance in contact with the water. Regardless, adding a compound that acts as a protective barrier against nitride oxidation, such as ZrN, U3Si2, and UO2, could reduce water oxidation. Early, UO2–UN composites were fabricated by hot pressing UO2–UN powder mixtures within 1300 °C–1590 °C. The manufacturing process adopted for the fuel pellet fabrication changed to the spark plasma sintering (SPS) method. Using SPS can avoid the exceptional resistance to producing a perfect microstructure and the high costs associated with 15N enrichment. The composite fuel suggested is UN-10% U3Si5 verified with FRAPCON code.

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  • IPEN-DOC 29340

    GOMES, D.S. ; OLIVEIRA, F.B.V. . Avaliação da liberação de gás de fissão para UO2 dopado por Cr2O3 / Assessment of fission gas release for Cr2O3-doped UO2. In: CONGRESSO BRASILEIRO DE CERÂMICA, 65-66., 6-9 de junho, 2022, Águas de Lindóia, SP. Anais... São Paulo, SP: Associação Brasileira de Cerâmica - ABCERAM, 2022.

    Abstract: Uranium dioxide has been the most common ceramic fuel used to generate electric power in the last sixty years. The lower addition of chromic oxide (Cr2O3) shows the benefits of large grain size. Using (Cr2O3-Al2O3)-doped UO2 comprises improved mechanical response and fission gas retention properties. The addition of Cr2O3 to UO2 slightly affected its thermal properties as proposed for pressurized water reactors and boiling water reactor designs. Advanced doped pellet technology (ADOPT) can improve fuel cycle economics and accident tolerance. Today, doped fuel pellets exhibit several favorable characteristics: large grain size, increased density, minor fission gas release (FGR), and reduced pellet cladding interactions. In simulation are used FRAPCON to simulate doped fuel and ferritic alloy as cladding. Most of the material properties of the Cr2O3-doped UO2 were identical to those of the classic UO2.

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  • IPEN-DOC 29339

    PAULA, P.P. ; CARVALHO, L.A. ; MUCCILLO, R. ; MUCCILLO, E.N.S. . Caracterização microestrutural e elétrica do galato de lantânio dopado com estrôncio e magnésio e contendo pequenas adições de galato de estrôncio / Microstructural and electrical characterization of strontium and magnesium doped lanthanum gallate with small additions of strontium galate. In: CONGRESSO BRASILEIRO DE CERÂMICA, 65-66., 6-9 de junho, 2022, Águas de Lindóia, SP. Anais... São Paulo, SP: Associação Brasileira de Cerâmica - ABCERAM, 2022. p. 276-285.

    Abstract: Cerâmicas de galato de lantânio dopado com estrôncio e magnésio (LSGM) vêm sendo estudadas para aplicação na produção de energia por meio de dispositivos eletroquímicos, como células a combustível de óxido sólido. Estas cerâmicas apresentam altos valores de condutividade iônica numa ampla faixa de pressões parciais de oxigênio, e estabilidade química. Neste trabalho, foi investigado o efeito de pequenas adições de Sr3Ga2O6 (SG) na microestrutura e na condutividade iônica do LSGM, com o objetivo de obter aumento em sua condutividade iônica. Amostras de LSGM contendo até 2% mol de SG foram preparadas por reação em estado sólido a 1400 ºC por 4 h. Altos valores de densidade (superior a 96% da densidade teórica) foram obtidos para todas as composições. O aditivo SG exerce pouca influência na microestrutura, mas promove aumento da condutividade iônica do LSGM.

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  • IPEN-DOC 29338

    CARVALHO, L.A. ; MUCCILLO, E.N.S. . Preparação e caracterização do La1+xSr1-xGa3O7+δ por complexação de cátions / Preparation and characterization of La1+xSr1-xGa3O7+δ by cation complexation. In: CONGRESSO BRASILEIRO DE CERÂMICA, 65-66., 6-9 de junho, 2022, Águas de Lindóia, SP. Anais... São Paulo, SP: Associação Brasileira de Cerâmica - ABCERAM, 2022. p. 267-275.

    Abstract: Compostos à base de galato de lantânio contendo estrôncio, La1+xSr1-xGa3O7+δ (LSG), com estrutura cristalina tipo melilita apresentam comportamento elétrico distinto dependendo da estequiometria do lantânio. Para x=0 o LSG puro tem comportamento isolante, enquanto que para maiores valores de x e até 0,6 torna-se um condutor iônico, com valores de condutividade próximos ao do galato de lantânio dopado com estrôncio e magnésio. Neste trabalho, o LSG (x=0 e 0,55) foi sintetizado pelo método de complexação de cátions visando obter um material homogêneo e com boa densificação. A calcinação foi feita a 800 ºC e a sinterização entre 1400 e 1470 ºC. As técnicas de caracterização empregadas foram: termogravimetria, análise elementar, determinação da densidade aparente e observação da superfície por microscopia eletrônica de varredura. Altos valores de densidade (>92% da densidade teórica) foram obtidos para o LSG sintetizado por este método.

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  • IPEN-DOC 29337

    SILVA, P.C.M. ; CARVALHO, F.M.S.; GUEDES-SILVA, C.C. . Densificação de cerâmicas de alumina com adição de titanato de neodímio / Densification of alumina ceramics with neodymium titanate additons. In: CONGRESSO BRASILEIRO DE CERÂMICA, 65-66., 6-9 de junho, 2022, Águas de Lindóia, SP. Anais... São Paulo, SP: Associação Brasileira de Cerâmica - ABCERAM, 2022. p. 252-257.

    Abstract: Muitos aditivos podem ser incorporados à alumina atuando como segunda fase de reforço, com o intuito de melhorar suas propriedades mecânicas. Como óxidos piezoelétricos tendem a aumentar a tenacidade à fratura de materiais frágeis devido ao mecanismo por troca de domínio, esse trabalho visa avaliar o efeito de adições de Nd2Ti2O7 na densificação de cerâmicas de alumina. Assim, amostras de alumina contendo 2,5, 5,0, 7,5, 10,0 e 12,5% em massa de Nd2Ti2O7 foram preparadas por meio de mistura de pós, seguida de sinterização a 1500, 1550 e 1600°C, por 1 hora, ao ar. Após a sinterização, a densidade e porosidade aparentes das amostras foram determinadas pelo método de Arquimedes. Todas as composições atingiram valores superiores a 95% da densidade teórica e porosidade aparente menor que 1%. Observando que maiores teores de Nd2Ti2O7 e menores temperaturas de sinterização favoreceram a densificação da alumina.

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  • IPEN-DOC 29329

    TOMINAGA, F.K. ; BOIANI, N.F. ; GARCIA, V.S.G. ; SILVA, T.T. ; LEO, P.; BORRELY, S.I. . Toxicidade aguda e avaliação de riscos ecológicos de fármacos pertencentes a diferentes classes detectados em ambientes aquáticos. In: CONGRESSO BRASILEIRO DE ECOTOXICOLOGIA, 16., 16-19 de agosto, 2021, Online. Anais... 2021.

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  • IPEN-DOC 29328

    BOIANI, N.F. ; SILVA, T.T. ; TOMINAGA, F.K. ; GARCIA, V.S.G. ; BORRELY, S.I. . Avaliação da toxicidade da mistura de fármacos submetidos a irradiação por feixe de elétrons. In: CONGRESSO BRASILEIRO DE ECOTOXICOLOGIA, 16., 16-19 de agosto, 2021, Online. Anais... 2021.

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  • IPEN-DOC 29327

    PIERETTI, EURICO F.; NEVES, MAURICIO D.M. das ; ANTUNES, RENATO A.. Estudo do acabamento superficial de dois aços inoxidáveis tratados a laser para aplicações biomédicas. In: ENCONTRO NACIONAL DE ENGENHARIA BIOMECÂNICA, 7., 3-6 de maio, 2022, Goiânia, GO. Anais... Rio de Janeiro, RJ: Associação Brasileira de Engenharia e Ciências Mecânicas - ABCM, 2022.

    Abstract: Os biomateriais fazem parte de uma classe de materiais que pertencem a um campo muito promissor, na medida em que devido à biocompatibilidade, resistência mecânica e estabilidade física e química podem ser aplicados para tratarem, repararem ou substituírem partes do corpo humano assegurando grandes benefícios para os pacientes, melhorando a qualidade de vida e contribuindo para a longevidade da população. Portanto, o acabamento superficial das peças é uma das etapas mais importantes na fabricação de um biomaterial para garantir sua adequação para a aplicação desejada. O presente trabalho avaliou o efeito da gravação por laser de fibra óptica nas superfícies de amostras de biomateriais produzidas com os aço inoxidáveis austenítico ISO 5832-1 e martensítico M340, por meio de análise microestrutural e caracterização de propriedades mecânicas de suas superfícies, a saber: rugosidade e micro dureza Vickers. Imagens de microscopia foram realizadas para caracterizar as mudanças na topografia das amostras tratadas a laser e apoiar os resultados obtidos.

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  • IPEN-DOC 29310

    ALMEIDA, S.B. ; CUNHA, A.P.V.; CAMPOS, L.L. . Dosimetric evaluation using 3D printed anthropomorphic skull phantom for small field dosimetry using thermoluminescent dosimeters. In: CONGRESSO BRASILEIRO DE FISICA MEDICA, 26th; CONGRESSO LATINO-AMERICANO DE FISICA MEDICA, 9th, June 8-11, 2022, Fortaleza, CE. Proceedings... São Paulo, SP: Associação Brasileira De Física Médica, 2022.

    Abstract: The usability of phantoms plays a critical role in commissioning and quality assurance programs in radiotherapy departments as they improve patient care setup with greater precision between personalized treatment planning and irradiation setup uncertainties. With the emergence of these new radiotherapy modalities, it became necessary to apply relatively small fields that are dynamic or static. The use of these field sizes can cause uncertainty in dosimetry, requiring special attention in small field dosimetry. TLDs have advantages for having characteristics such as high spatial resolution and dose response, offering a promising opportunity to measure the absorbed dose in a small field. As a result, we can conclude that the use of the 3D phantom with thermoluminescent dosimeters proved to be very useful in the application of small field dosimetry, enabling a more accurate investigation in quality controls involving treatments whose doses are relatively high in radiosurgery techniques that require more accurate and reliable measurements in dose delivery.

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  • IPEN-DOC 29309

    SIGLER JUNIOR, EDUARDO; BARBOSA, PATRICIA A.; ROSSI, WAGNER de ; SANTANA, TATIANA D.; CARNEIRO, MARCELO B.. Análise do desempenho de ferramenta de corte de cerâmica texturizada a laser no torneamento do FC250 / Analysis of the performance of ceramic cutting tool texturized by laser in the FC250 turning. In: CONGRESSO NACIONAL DE ENGENHARIA MECÂNICA, 11., 7-11 de agosto, 2022, Teresina, PI. Anais... Rio de Janeiro, RJ: Associação Brasileira de Engenharia e Ciências Mecânicas - ABCM, 2022.

    Abstract: Ferramentas de corte de cerâmica são utilizadas na usinagem de ferros fundidos, aços ligas e aços endurecidos. As cerâmicas estruturais se caracterizam por possuir elevada dureza à quente, resistência à compressão e inércia química elevada. Estas propriedades permitem que o material tenha elevada resistência ao desgaste. Técnicas de texturização tem sido investigadas em ferramentas de usinagem para diminuir os esforços de corte, o atrito, com o intuito de aumentar vida útil da ferramenta, além de melhorar qualidade na peça usinada. Assim, o objetivo deste trabalho é avaliar o desempenho de ferramentas de corte de cerâmica a base de óxido alumínio texturizadas por laser, no torneamento de ferro fundido cinzento, que produz cavaco descontínuo. Para tanto, foi gerado um padrão de textura reta e paralela a aresta principal de corte em uma estação de laser de pulsos ultracurtos. As texturas foram caracterizadas em um microscópio 3D óptico. Testes de usinagem foram realizados em um torno CNC, mantendo as condições de corte constante, porém variando as ferramentas em referência (sem textura) e texturizada. Os esforços de corte foram monitorados com auxílio de um dinamômetro. A qualidade da superfície da peça usinada foi avaliada através dos parâmetros de rugosidade Ra (média aritmética dos valores absolutos das ordenadas de afastamento) e Rz (média aritmética da altura máxima do perfil para cinco comprimento de amostragem). A peça de trabalho foi um ferro fundido cinzento (FC250). Cada ferramenta usinou uma barra do mesmo material e dimensão. Os resultados mostraram força de usinagem 7% (54 N) maior para a ferramenta texturizada. Na avaliação da rugosidade, os valores de Ra foram semelhantes para as duas ferramentas avaliadas, enquanto que para Rz a ferramenta texturizada gerou valores 6% (0,46 μm) maiores em relação à de referência. As ferramentas texturizadas não apresentaram lascamento devido aos esforços submetidos a mesma durante as condições de ensaio

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  • IPEN-DOC 29308

    ROCHA, MARCELO da S. ; ANDRADE, DELVONEI A. de . Development of an open source tool for water hammer and fluid-structure interaction simulation in nuclear reactors systems. In: TECHNICAL MEETING ON THE DEVELOPMENT AND APPLICATION OF OPEN-SOURCE MODELLING AND SIMULATION TOOLS FOR NUCLEAR REACTORS, June 20-24, 2022, Milano, Italy. Proceedings... 2022.

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  • IPEN-DOC 29306

    NACARATTI, DAVI P.; SAMAD, RICARDO E. ; MOTTA, CLAUDIO C.. A Finite-Difference Time-Domain analysis of fiber Bragg gratings. In: SBFOTON INTERNATIONAL OPTICS AND PHOTONICS CONFERENCE, October 13-15, 2022, Recife, PE. Proceedings... Piscataway, NJ, USA: IEEE, 2022. DOI: 10.1109/SBFotonIOPC54450.2022.9992634

    Abstract: An analytical formulation and modeling of an optical fiber Bragg gratings has been developed and is reported in this paper. Supported by the Finite-Difference Time-Domain (FDTD) method, it was possible to set a 1018 nm bragg grating and simulate an electromagnetic field going through this periodic refractive-index device to obtain reflectivity, transmittivity, and bandwidth. Moreover, the model is applied to analyze the influence of structural parameters of fiber gratings, such as length, grating period, and refractive index modulation on its spectral response.

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  • IPEN-DOC 29305

    MELO, PEDRO B. dos S.; SAMAD, RICARDO E. ; MOTTA, CLAUDIO C.. A solution of an YDFA in tandem-pumping configuration with ASE using RK4 method. In: SBFOTON INTERNATIONAL OPTICS AND PHOTONICS CONFERENCE, October 13-15, 2022, Recife, PE. Proceedings... Piscataway, NJ, USA: IEEE, 2022. DOI: 10.1109/SBFotonIOPC54450.2022.9992809

    Abstract: A new solution for a tandem amplifier is presented using a fiber doped with ytterbium and a core coating ratio of 30/250 and which incorporates the solution of the rate equations with the amplified spontaneous emission characteristic in these multi-kilowatt systems. The model describes in a more precision way the behavior of a fiber amplifier with a 5. 986kW,1018nm pumping and a signal seed of 75W, 1080nm, solving the propagation and rate equations using the fourth-order Runge-Kutta as well the relaxation methods as a convergence criterion for the integrations.

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  • IPEN-DOC 29304

    MENDES, LUCAS S.; SAMAD, RICARDO E. ; MOTTA, CLAUDIO C.. Theoretical analysis of the transmission efficiency of a (6 + 1) × 1 pump–signal combiner. In: SBFOTON INTERNATIONAL OPTICS AND PHOTONICS CONFERENCE, October 13-15, 2022, Recife, PE. Proceedings... Piscataway, NJ, USA: IEEE, 2022. DOI: 10.1109/SBFotonIOPC54450.2022.9992582

    Abstract: An analytical formulation for the transmission efficiency of a(6+1)× 1 pump-signal combiner has been developed and is reported in this paper. The formulation is supported by the Coupled Mode Theory (CMT), and the Finite Difference Beam Propagation Method (FD-BPM). In this scope, the characteristics of commercial fibers FG200AEA, GDF20/200, P-20/400DC are considered to build a combiner computational model. Thus, the CMT was used to estimate the adiabatic length of the input bundle fibers and the combiner efficiency was analyzed based on FD-BPM.

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  • IPEN-DOC 29303

    FAROOQ, SAJID ; CARAMEL-JUVINO, AMANDA ; DEL-VALLE, MATHEUS ; SANTOS, SOFIA ; BERNARDES, EMERSON S. ; ZEZELL, DENISE M. . Superior Machine Learning Method for breast cancer cell lines identification. In: SBFOTON INTERNATIONAL OPTICS AND PHOTONICS CONFERENCE, October 13-15, 2022, Recife, PE. Proceedings... Piscataway, NJ, USA: IEEE, 2022. DOI: 10.1109/SBFotonIOPC54450.2022.9992467

    Abstract: We propose an artificial intelligence platform based on machine learning (ML) algorithm using Neighborhood Component analysis and K-Nearest Neighbors for breast cancer cell lines recognition. Our model presents up to 97% accuracy for identification of breast cancer cell lines.

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  • IPEN-DOC 29302

    CARAMEL-JUVINO, AMANDA ; FAROOQ, SAJID ; ROMANO, MARIANA; ZEZELL, DENISE M. . Identification of enamel demineralization using high performance convolutional neural network. In: SBFOTON INTERNATIONAL OPTICS AND PHOTONICS CONFERENCE, October 13-15, 2022, Recife, PE. Proceedings... Piscataway, NJ, USA: IEEE, 2022. DOI: 10.1109/SBFotonIOPC54450.2022.9992381

    Abstract: Here, we traces use segmentation and convolutional neural network (CNN) to trace, diagnose and quantify enamel demineralization for research. The preprocessing, histograms based methods are used to enhance the contrast and equalize the brightness through the scanning electron microscope images. Our result evidence that the deep learning based CNN model is highly efficient to process the dental image to achieve high accuracy of enamel demineralization and presents promising outcomes with optimal precision.

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  • IPEN-DOC 29301

    ZUFFI, ARMANDO V.F. ; TABACOW, FABIO B.D. ; VIEIRA JUNIOR, NILSON D. ; SAMAD, RICARDO E. . Ultrafast laser micromachining of submillimetric de Laval nozzles in alumina for laser electron acceleration. In: SBFOTON INTERNATIONAL OPTICS AND PHOTONICS CONFERENCE, October 13-15, 2022, Recife, PE. Proceedings... Piscataway, NJ, USA: IEEE, 2022. DOI: 10.1109/SBFotonIOPC54450.2022.9992490

    Abstract: We have explored the fabrication of submillimetric de Laval nozzles by ultrashort laser pulses micromachining in alumina, a dielectric ceramic, to generate supersonic gas jets in vacuum. The nozzles were manufactured in a home-built trepanning setup, and their geometry and surface quality dependence on the laser and machining parameters was investigated, aiming to control the jet spatial density to produce optimal gaseous targets for laser electron acceleration.

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  • IPEN-DOC 29300

    ROMANO, FERNANDO C. ; WETTER, NIKLAUS U. . Numerical simulation tool and experimental set-up for measuring the modal structure of a broad area semiconductor laser diode. In: SBFOTON INTERNATIONAL OPTICS AND PHOTONICS CONFERENCE, October 13-15, 2022, Recife, PE. Proceedings... Piscataway, NJ, USA: IEEE, 2022. DOI: 10.1109/SBFotonIOPC54450.2022.9992843

    Abstract: A computer simulation model for a single stripe, multimode laser diode of the type broad area laser diode (BALD) was built. In sequence, an experimental set-up preparation followed the numeric tool with the objective of identifying the lateral modes by using the frequency beat technique in the RF spectrum. A spectrum analyzer measured the signals emitted by the BALD using the fast Fourier transform (FFT) method.

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  • IPEN-DOC 29299

    BALTAR, RAPHAEL M.S.M.; ARAUJO, RENATO E. de; FAROOQ, SAJID . Selecting silver nanoshells for colorimetric sensors. In: SBFOTON INTERNATIONAL OPTICS AND PHOTONICS CONFERENCE, October 13-15, 2022, Recife, PE. Proceedings... Piscataway, NJ, USA: IEEE, 2022. DOI: 10.1109/SBFotonIOPC54450.2022.9992430

    Abstract: In this work the use of silver nanoshell as a starting point for the establishment of colorimetric sensor platforms, under solar illumination, was evaluated. Mie theory was explored on the analysis of the nanosensor linearity and sensitivity, considering 4 different color spaces and the influence of the nanoshell geometry. A high performance plasmonic nanoplatform was identified. The nanosensor platform based on nanoshells, with 35 nm SiO 2 core radius and 25 nm Ag shell thickness, showed sensitivity values up to 2.78 RIU -1 and linearity higher than 0.96, considering the Hue parameter of the HSV color space. The identification of optimized plasmonic nanoplatforms may extend the use naked-eye colorimetric applications in low-resource environments.

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  • IPEN-DOC 29298

    MORAIS, PAULO J.D. de; SILVA, RUBENS C. da; ROSSI, WAGNER de ; MOTTA, CLAUDIO C.. Numerical solution of atmospheric laser beam propagation using artificial compressibility and pseudo-spectral methods. In: SBFOTON INTERNATIONAL OPTICS AND PHOTONICS CONFERENCE, October 13-15, 2022, Recife, PE. Proceedings... Piscataway, NJ, USA: IEEE, 2022. DOI: 10.1109/SBFotonIOPC54450.2022.9992726

    Abstract: In order to analyze the thermal blooming on wireless power transmission and remote recharge of batteries this study proposes a coupled numerical solution. The Navier-Stokes, energy and paraxial equations to the laser beam propagation through the atmosphere are solved by artificial compressibility and pseudo-spectral methods. Changes in the refractive index due to asymmetric temperature variations are the cause of this optical phenomenon. Numerical results are compared with reference studies and a good agreement is obtained. The conditions: laser beam, power density and absorptivity are constants; flow regime of Re=1000,Ri=10.e4, laser wavenumber k=10.e5, and Stanton number St=1/30.

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  • IPEN-DOC 29297

    SILVA, RUBENS C. da; MORAIS, PAULO J.D. de; CARVALHO, ANDRE; ROSSI, WAGNER de ; MOTTA, CLAUDIO C.. Numerical simulation on modified chemical vapor deposition (MCVD) thermal flow field. In: SBFOTON INTERNATIONAL OPTICS AND PHOTONICS CONFERENCE, October 13-15, 2022, Recife, PE. Proceedings... Piscataway, NJ, USA: IEEE, 2022. DOI: 10.1109/SBFotonIOPC54450.2022.9993108

    Abstract: This study determines the hydrodynamic and thermal properties of flow field for modified chemical vapor deposition (MCVD) process by means of a computational fluid dynamics (CFD) steady-state simulation. A three dimensional hexahedral mesh and the finite volume method were used to solve the momentum, continuity, energy and chemical species equations on a domain represented by a rotating tube of 24mm diameter, 45 rpm and a flow regime of Re=900. User defined functions were used on STAR-CCM+ code to modeling the SiCl 4 oxidation, which occurred in the zones with the highest temperatures (1800K) determined by the torch heating profile. The numerical results were compared with a reference study and a good agreement was obtained.

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  • IPEN-DOC 29184

    MARCELO, LARISSA A. ; ROSSI, JESUALDO L. ; LARA, JOSE A.C. ; MUCSI, CRISTIANO S. . Analysis of Resistance Spot Welding (RSW) on 22MnB5 material after hot stamping for automotive applications (B-pillar). In: SIMPÓSIO INTERNACIONAL DE ENGENHARIA AUTOMOTIVA, 28th, March 17-18, 2021, Online. Proceedings... São Paulo, SP: Blucher, 2021. p. 157-161. DOI: 10.5151/simea2021-PAP37

    Abstract: One of the major concerns that arose in recent years within the automotive industry has been making cars sustainable, safe and economic. One of the ways to solve this equation is to use lighter materials that reduce the weight of vehicles and increase the energy absorption mainly on the B-pillar. This paper aims to study the RSW cycle of the welding parameter known as P1. The parameter were defined to reach the maximum load during the tensile test according to the norm AWS D8.9. The test samples were assembled with a GAP to reproduce real vehicle welding conditions, and the parameter P1 weld 22MnB5 steel samples with heat treatment, known as Press Hardening Steel (PHS). The influence of these parameters on the PHS mechanical properties was evaluated with Vickers hardness test (HV), metallographic technique, conducting ultrasonic and tensile test. The results confirmed the difference at the Heat affected zone (HAZ) mechanical strength over fusion zone. It was possible to visualize a softening region in the HAZ and increasing to the weld point, which is demonstrated in the microstructural analysis and thus justifies the detachment of the weld button of the base material in tensile test. Keywords: PHS, HAZ, RSW.

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  • IPEN-DOC 29183

    JESUS, E.R.B.; MUCSI, C.S. ; LARA, J.A.C. ; NOGUEIRA, E.J. ; FURLANETTO, V.; ROSSI, J.L. . Analysis of the mechanical performance of spot welding on PHS 22MnB5 steel. In: ENCONTRO CIENTÍFICO DE FÍSICA APLICADA,12., 20-22 de abril, 2022, Vitória, ES. Anais... Recife, PE: Even3, 2022. DOI: 10.29327/ECFA2022.487309

    Abstract: The hot pressing hardened steel known as “press hardened steel - PHS” is a steel of extreme importance for the automotive industry. The application of this type of steel in the structure of vehicles promotes the improvement of safety, mass reduction and lower fuel consumption. The increase in the use of this type of steel, culminated in the need to deepen knowledge about the joining processes, more specifically about the electrical resistance spot welding process - RSW, which is one of the most used processes in automotive structural construction. The aim of the present work was the evaluation of the autogenous spot weld of 22MnB5 steel hardened through heat treatment in laboratory scale, simulating the cooling rates used during the hot pressing, commonly used in the automotive industrial practice. Welds were made in two different conditions, with welding parameters in a single step (direct welding) and with parameters considering additional pre and post heating steps. Mechanically, the welds were evaluated through the standardized test called tension shear test. The results showed that, according to the American Welding Society - AWS standard, the performance of the welds meets the minimum requirements required for the group of materials in which 22MnB5 falls.

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  • IPEN-DOC 29182

    MUNHOZ, PEDRO M. ; NASCIMENTO, FERNANDO C. ; SILVA, LEONARDO G.A. ; GARY, BRUNO C. ; CALVO, WILSON A.P. . Simulation of radiation attenuation in polymer matrix composite with epoxy resin, reinforced with carbon fiber and dispersion of bismuth oxide (Bi2O3) nanoparticles. In: SILVA, R.J. da (Ed.); PANZERA, T.H. (Ed.) BRAZILIAN CONFERENCE ON COMPOSITE MATERIALS, 6th, August 14-18, 2022, Tiradentes, MG. Proceedings... São João del-Rei, MG: Universidade Federal de São João del-Rei, 2022. p. 619-624. DOI: 10.29327/566492

    Abstract: The aim of this study was to simulate gamma radiation attenuation using a polymer matrix composite of an epoxy (DGEBA) resin that was reinforced with carbon fiber cloth fabric and then dispersed with bismuth (III) oxide (Bi2O3) nanoparticles. The quantitative methodology was used for this simulation with the software Topas MC (version 3.7). The mass ratios of the bismuth (III) oxide nanoparticles in the composite were approximately 0.163, 0.244, 0.325 and 0.407. The photon energy in the simulation was 100 keV, typical X-ray energy in Medical Imaging (Diagnostic Radiography). The mass ratio of 0.407 and the polymer matrix composite at a thickness of 2.29 mm provided 89.03% attenuation of the photon energy. However, for the lead plate, a thickness of 0.34 mm was necessary for similar attenuation. Nonetheless, the fabrication process of a composite plate is easier than that of a lead plate. In conclusion, a composite of an epoxy polymer matrix, with bismuth (III) oxide dispersion, reinforced with carbon fiber, is an excellent option as compared to a lead plate. The composite plate can attenuate photon energy and does not present an acute or chronic danger to the environment or to health. Also, it is non-carcinogenic, and does not cause reproductive toxicity, both clear advantages over lead. Finally, it should be noted that other applications of the composite would be production of an X-ray shield and aerospace industries, among others.

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  • IPEN-DOC 29181

    GARY, B.C. ; MARINUCCI, G. ; MUNHOZ, P.M. ; SILVA, L.G.A. . Evaluation of polyester/glass fiber waterproof composite subjected to temperature and acid environment. In: SILVA, R.J. da (Ed.); PANZERA, T.H. (Ed.) BRAZILIAN CONFERENCE ON COMPOSITE MATERIALS, 6th, August 14-18, 2022, Tiradentes, MG. Proceedings... São João del-Rei, MG: Universidade Federal de São João del-Rei, 2022. p. 300-304. DOI: 10.29327/566492

    Abstract: Polymer composites have a wide range of chemical applications, with strong performance in the paper and cellulose and sugar-alcohol industry due to the chemical resistance such materials offer because of the presence of the polymer matrix. The literature shows that vinyl ester resins offer chemical resistance for these applications, however at a higher price than commercial resins, such as unsaturated polyesters. The aim of this research was to evaluate the chemical resistance of glass fiber reinforced waterproof polyester resin composites (GFPO). Composite was manufactured by hand lay-up and the waterproof polyester specimens were kept immersed in a buffer solution with pH 3 at 70 °C for 150 days. To evaluate the behavior of waterproof polyester composites, flexural tests were performed and compared with properties of the vinyl ester composites. After the chemical resistance test, the GFPO composite presented a Young’s modulus of 6 GPa with a maximum flexural of 100.6 N. In conclusion, a waterproof polyester resin composite can be a good option for applications in corrosive environments where a vinyl ester resin composite would be applied.

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  • IPEN-DOC 29155

    MELO, CAMILA G. ; ROSA, JORGE M. ; SILVA, LEONARDO G. de A. e ; PEREIRA, MARIA da C.C. . Emprego de radiação ionizante em efluente de tingimento têxtil com o corante Reactive Black 5 para a avaliação da cor e da toxicidade. In: CONGRESSO NACIONAL DE MEIO AMBIENTE, 19., 20-22 de setembro, 2022, Poços de Caldas, MG. Anais... Muzambinho, MG: Instituto Federal de Educação, Ciência e Tecnologia do Sul de Minas Gerais - Campus Muzambinho, 2022.

    Abstract: Os corantes reativos são os mais empregados no tingimento da fibra de algodão, e se destacam por sua estabilidade química e pelos altos índices de solidez da cor do substrato têxtil. Entretanto, a concentração de corante hidrolisado presente no banho após o tingimento pode chegar a 60% e, somados aos demais compostos orgânicos utilizados, acarretam águas residuais fortemente coloridas e com alta carga de contaminantes. Neste contexto, o objetivo deste estudo foi avaliar a redução da cor e da toxicidade aguda de efluente sintético de tingimento têxtil com o corante Reactive Black 5. O efluente têxtil foi irradiado por meio de acelerador de elétrons, nas doses de 2,5 kGy, 5,0 kGy, 7,5 kGy e 10 kGy, e submetido a análises de toxicidade aguda com o microcrustáceo Daphnia similis e de absorbância, por espectrofotometria visível. Os ensaios de toxicidade aguda apontaram elevada toxicidade do efluente, com valores de CE50 abaixo de 1%. A máxima absorbância do efluente bruto em 590 nm foi de 1,67. O emprego da radiação ionizante por feixe de elétrons proporcionou a redução de 20,69% da toxicidade do efluente na dose de 5 kGy e redução da cor acima de 90%, a partir de 2,5 kGy. A radiação ionizante por feixe de elétrons se mostrou eficaz no tratamento do efluente estudado, para a redução da cor e da toxicidade.

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  • IPEN-DOC 29154

    MELO, CAMILA G. ; BORRELY, SUELI I. ; ROSA, JORGE M. ; PEREIRA, MARIA da C.C. . Águas residuais de tingimentos têxteis por processo convencional e após tratamento e reutilização: avaliação de parâmetros físico-químicos e de toxicidade. In: CONGRESSO NACIONAL DE MEIO AMBIENTE, 19., 20-22 de setembro, 2022, Poços de Caldas, MG. Anais... Muzambinho, MG: Instituto Federal de Educação, Ciência e Tecnologia do Sul de Minas Gerais - Campus Muzambinho, 2022.

    Abstract: A indústria têxtil é destaque mundial, tanto por sua importância econômica, quanto pelas questões ambientais relacionadas à sua cadeia produtiva. As águas residuais provenientes de tingimentos com corantes reativos, possuem características complexas que comprometem os corpos d’água receptores e, consequentemente, a sobrevivência dos organismos aquáticos. Neste contexto, o estudo contemplou a realização de cinco tingimentos consecutivos, usando efluente tratado em cada etapa. Todos os tratamentos fotoquímicos obtiveram Decaimento Absorciométrico (DA) acima de 90%, permitindo que o efluente fosse reaproveitado em novos tingimentos desde o primeiro até o último efluente tratado. No processo proposto, a taxa de Carbono Orgânico Total (COT) obtida após cinco tingimentos consecutivos com o efluente tratado foi de 34 mg L-1, em comparação aos 435 mg L-1 do efluente obtido após cinco processos convencionais. A Salinidade do efluente final obtida pelo processo proposto foi de 2,34 g L-1 de NaCl, comparada a concentração de 25 g L-1 apresentada no efluente pelo processo convencional. O consumo médio de água para um tingimento de algodão de um quilograma, pelo processo proposto, foi de aproximadamente 24 litros, em comparação aos 70 litros consumidos pelo processo convencional. No entanto, o efluente tratado apresentou valores de toxicidade < 6,25% (CE50, com intervalo de confiança de 95%) contra 10,25% do efluente bruto (sem tratamento). A concentração mediana, que causou a imobilidade dos organismos expostos, indicou a maior sensibilidade do microcrustáceo Daphnia similis ao efluente tratado.

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  • IPEN-DOC 29153

    PENIN Y SANTOS, S.; CARVALHO, ELIAS F. . GHG emissions, present energies, future with storage: highlight for China, USA, and Brazil. In: INTERNATIONAL CONFERENCE ON HARMONICS AND QUALITY OF POWER, 20th, May 29 - June 1, 2022, Naples, Italy. Proceedings... Piscataway, NJ, USA: IEEE, 2022. DOI: 10.1109/ICHQP53011.2022.9808572

    Abstract: Before the previous 252 years almost all human tasks depended on human muscles. The steam engine accelerates the intensive use of natural resources and in this period the ppm of CO2 in the atmosphere increased by 48%. The population was 750-800mi. The rapid growth to 7.8 billion, now on much better terms including food, uses approximately 615 Exa Joules (EJ) to meet its needs in electricity, transport, heating and industries, as well as to produce food. To stop hazardous emissions, a radical matrix change is underway. Solar, wind and other renewable energy must replace fossil fuels while maintaining the quality of energy, especially electrical energy. This article addresses these issues.

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  • IPEN-DOC 29152

    FERRO, DAPHNE ; KOTANI, PALOMA ; PAVARIN, LAURA ; AFFONSO, REGINA ; ORTIZ, NILCE . Utilização de TiO2 microestruturado com biocarvão para desinfecção solar catalítica de efluentes contaminados por microorganismos. In: SIMPOSIO LUSO-BRASILEIRO DE ENGENHARIA SANITARIA E AMBIENTAL, 20th, June 29 - July 1, 2022, Aveiro, Portugal. Proceedings... Lisboa, Portugal: Associação Portuguesa dos Recursos Hídricos, 2022. p. 527-532.

    Abstract: No Brasil, o Novo Marco Legal do Saneamento Básico demanda que 99% dos cidadãos brasileiros devem ter acesso à água potável até 2033. Neste sentido, muitos processos de tratamento de água estão sendo desenvolvidos empregando diversas tecnologias, incluindo a fotocatálise, a radiação solar e a ultravioleta. Estes processos de tratamento e desinfecção solar são favoráveis principalmente considerando a localização geográfica brasileira empregando a luz solar que causa danos severos no DNA de patógenos. O semicondutor escolhido para a fotocatálise heterogênea foi o dióxido de titânio, que apresenta baixa toxicidade e possui reservas abundantes no Brasil. Este composto é um dos mais empregados em fotocatálise porque promove eficientemente a produção de sítios oxidantes e redutores na superfície, facilitando o surgimento de radicais HO• e H•. No entanto, para a utilização como catalisador é necessário que o dióxido de titânio possua a estrutura cristalina anatase e microestruturas estáveis que conferem elevados valores de área superficial e porosidade. A estrutura catalítica porosa foi obtida com a adição do biocarvão de eucalipto reflorestado como biotemplate, na moldagem do dióxido de titânio no processo de síntese sol-gel e resultou em uma estrutura de elevada porosidade. Desta forma, foi obtido os sítios de adsorção e interação, com significativo aumento do efeito sinérgico para a fotodesinfecção. A eficiência do processo de fotodesinfecção foi avaliada por meio da contagem do número de colônias da bactéria Escherichia coli, sendo essa onipresente nos efluentes domésticos. Processos de fotodesinfecção realizados com água de lavagem contendo esta bactéria se mostram promissores, com o emprego de 0,05g de dióxido de titânio microestruturado com biocarvão a porcentagem de redução no número de colônias de bactérias foi acima de 80% em uma hora de exposição. A otimização do processo de fotodesinfecção pode viabilizar uma nova alternativa aos métodos de desinfecção utilizados no país.

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  • IPEN-DOC 29148

    ESQUIVEL, ALEXANDER; KODAMA, YASKO ; VILLARREAL, JOSE; JURI AYUB, JIMENA; GONZALEZ, GUADALUPE; TEJEDOR-FLORES, NATHALIA. Técnicas nucleares y su versatilidad para la utilización y estudio de diversos procesos. In: GALAN, JAVIER S. (Ed.); FABREGA, JOSE (Ed.) CONGRESO NACIONAL DE CIENCIA Y TECNOLOGIA, 18th, June 23-25, 2021, Online. Proceedings... Ciudad de Panamá, Panamá: Universidad Tecnológica de Panamá, 2021. p. 131-135. DOI: 10.33412/apanac.2021.3080

    Abstract: The study of various topics of science is carried out using tools that often do not achieve the depth of analysis required to respond to situations that affect the world in general, are often invasive and pollute. Over time it has been shown that nuclear techniques are a viable alternative to develop more comprehensive studies in various fields of science such as: health, agriculture, industry, environment, security, among others. This group work session was organized considering the need to inform society about the other side of nuclear energy and its positive contributions to the development of countries, to make them more competitive and environmentally friendly.

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  • IPEN-DOC 28986

    ANTUNES, A. ; SALVADOR, V.L.R. ; SCARPIN, M. ; ROSSI, W. de ; ZEZELL, D.M. . Analysis of Ca/P ratio in dental enamel irradiated with short pulse laser. In: RIGHINI, GIANCARLO C. (Ed.); CONSORTINI, ANNA (Ed.) CONGRESS OF THE INTERNATIONAL COMMISSION FOR OPTICS: OPTICS FOR THE QUALITY OF LIFE, 19th, August 25-30, 2002, Florence, Italy. Proceedings... Bellingham, WA, USA: SPIE, 2003. p. 1006-1007. (Proceedings SPIE 4829). DOI: 10.1117/12.530474

    Abstract: Recently most analyses of Ca and P in different parts of tooth enamel have been performed semiquantitatively. A direct and semi quantitative method for the determination of major and trace elements in human teeth by X-ray spectrometry is reported. The ratio Ca/P has been determined in the surface enamel of the third molar teeth. The surfaces were irradiated with short pulse laser Nd:YAG. The modifications in human dental enamel chemical composition for major and trace elements is here outlined. The accuracy of procedures was performed by analysis of natural hydroxyapatite as standard reference material. Results are consistent with other studies and they have indicated greater ratio Ca/P in irradiated groups in comparison to the non-irradiated group.

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  • IPEN-DOC 28982

    ZEZELL, DENISE M. ; SILVA, MATEUS R.; CASTRO, PEDRO A.A. ; SILVA, TANIA M.; GONCALVES, SERGIO E.P.. Nd:YAG laser on dental enamel in the reduction of artificial caries demineralization. In: LILGE, LOTHAR D. (Ed.); PHILIPP, CARSTEN M. (Ed.) EUROPEAN CONFERENCES ON BIOMEDICAL OPTICS, June 23-24, 2019, Munich, Germany. Proceedings... Bellingham, WA, USA: SPIE, 2019. p. 110791R-1 - 110791R-3. (Proceedings SPIE 11079, Medical Laser Applications and Laser-Tissue Interactions IX). DOI: 10.1117/12.2527213

    Abstract: Nd:YAG-laser associated to a photoabsorber, in the reduction of artificial caries in enamel was evaluated. Eighty bovine specimens with 6mm diameter and 2mm high were obtained and a half of the surface of each was protected as a control. Microdurometer and FTIR were performed initially and 8 groups (n=10) were obtained according to treatments: G1(- control): no-treatment; G2(+control): fluorophosphate; G3(Nd:YAG 60mJ/pulse, 10Hz, 48J/cm2, non-contact); G4(photoabsorber + Nd:YAG 60mJ); G5(Nd:YAG 80mJ/pulse, 10Hz, 64J/cm2); G6(photoabsorber + Nd:YAG 80mJ); G7(Nd:YAG 100mJ/pulse, 10Hz, 80J/cm2); G8(photoabsorber + Nd:YAG 100mJ). De-remineralization cycle were performed for induction of artificial caries and to interferometer, microdurometer and FTIR. Microhardness data were submitted to 2-way ANOVA and Tukey/Dunnett tests 5%. Statistically differences were obtained in the photoabsorberfactor individually and in the interaction between laser and photoabsorber. There was a lower percentage of microhardness loss in the groups with photoabsorber; G8 presented microhardness similar to G2. FTIR data were submitted to T-test 5%. Compared with G2, higher concentrations of carbonate were found in G4, G6 and G8; phosphate in G8; lower Amide-I concentration at G8 and higher Carbonate/Phosphate ratio at G4 and G6. The interferometry results were submitted to 3-way ANOVA of repeated measures 5%. There were statistically differences in the photoabsorber-factor individually and in the time-factor. Photoabsorber decreased the demineralization; Nd:YAG-laser without photoabsorber were less effective than fluoride; Nd:YAG-laser 100mJ with photoabsorber was as effective as fluoride and; the Nd:YAG-laser, associated or not to the photoabsorber, was no more effective than fluoride in the reduction of artificial decay.

    Palavras-Chave: demineralization; caries; lasers; enamels; dentistry

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  • IPEN-DOC 25222

    KAUFFMAN, C.M.F.; CARVALHO, M.T.; ARAUJO, R.E.; FREITAS, A.Z. ; ZEZELL, D.M. ; GOMES, A.S.L.. Characterization of the dental pulp using optical coherence tomography. In: RECHMANN D.D.S., PETER (Ed.); FRIED, DANIEL (Ed.) SPIE BiOS, January 21-26, 2006, San Jose, California, USA. Proceedings... Washington, USA: SPIE, 2006. p. 613707-1 - 613707-8. (Proceedings SPIE 6137, Lasers in Dentistry XII). DOI: 10.1117/12.653295

    Abstract: The inner structure of teeth, i.e. the root canal anatomy, is very complex. However a good knowledge of endodontic architecture is the first step towards successful endodontic treatment. Optical coherence tomography (OCT) is a powerful technique to generate images of hard and soft tissue. Its images show dependency on the optical properties of the tissue under analysis. Changes in the scattering and absorption of tissues can be observed through the OCT images. In this work, we used optical coherence tomography to perform in vitro studies of the inner structure of the first molar of albino rats (Rattus norvegicus). Focusing on the pulp chamber and in the root canal, we compare the images generated with the OCT technique to the histology. We are analyzing the feasibility of OCT to help on the diagnostic of endodontic diseases.

    Palavras-Chave: oral cavity; tomography; coherent radiation; optical systems

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  • IPEN-DOC 28977

    PORTO, KARINA M.B.G.; BORRELY, SUELI I. ; D'ALMEIDA, MARIA L.O.. Efeitos da radiação gama em propriedades de papel grau cirúrgico para embalagem. In: ABTCP INTERNATIONAL PULP AND PAPER CONGRESS, 46th, October 8-10, 2013, São Paulo, SP. Proceedings... São Paulo, SP: Associação Brasileira Técnica de Celulose e Papel - ABTCP, 2013. p. 1-10.

    Abstract: Embalagens contendo produtos para saúde normalmente passam por processos de esterilização, sendo um deles o que emprega radiação gama. Neste estudo duas amostras de papel grau cirúrgico, procedentes de embalagens comerciais, uma tendo apenas fibras de coníferas e outra uma mistura de fibras de coníferas e folhosas, foram irradiadas com raios gama nas doses de 25kGy com taxa de dose de 1,57kGy/h e 50kGy com taxa de dose de 1,48 kGy/h. As propriedades mais afetadas foram alvura, pH e as de resistência mecânica, sendo o efeito causado nas propriedades mecânicas menos acentuado no caso da amostra de papel com fibras de coníferas. A dose de 50 kGy exerce um efeito sobre as propriedades do papel da ordem de 10% a 15% maior do que a dose de 25kGy, que é a usualmente empregada para esterilização.

    Palavras-Chave: gamma radiation; radiation effects; packaging; sterilization; radiation doses; surgical materials; paper

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  • IPEN-DOC 28909

    FERREIRA, MARIA C. de M.S.C.; LEAL, LEONARDO B.; NOGUEIRA, MARCELO S.; CASTRO, PEDRO A.A. ; PERALTA, FELIPE; ZEZELL, DENISE M. ; CARVALHO, LUIS F. das C. e S. de. Biochemical characterization of saliva of smoking and non-smoking patients by using Fourier-transform infrared spectroscopy. In: HUANG, ZHIWEI (Ed.) SPIE PHOTONICS WEST; SPIE BIOS, January 22 - February 28, 2022, San Francisco, CA, USA. Proceedings... Bellingham, WA, USA: SPIE, 2022. p. 119570E-1 - 119570E-12. (Proceedings SPIE 11957, Biomedical Vibrational Spectroscopy 2022: Advances in Research and Industry). DOI: 10.1117/12.2610565

    Abstract: More than 90% of oral malignant neoplasms consist of squamous cell carcinoma originated from extrinsic and/or intrinsic multifactorial etiology on the epithelium of the oral mucosa. This multifactorial etiology makes early-stage cancer detection challenging due to the lack of associated oral-tissue clinical features and absence of changes on conventional cellular-imaging, serological and histopathological exams. By using a molecular-sensitive optical technique such as Fourier-transform infrared (FT-IR) spectroscopy, disease-specific biochemical changes can be detected non-destructively, non-invasively and with small sample volumes. In this study, we have used FT-IR spectroscopy to analyze saliva samples of control, smoker, and occasional smoker groups and determine their intrinsic molecular changes as well as the performance of sample differentiation by using a neural network classifier. Saliva samples were collected by spitting, homogenized and stored at -20ºC until analysis. Spectral data was collected in the fingerprint region (900cm-1 to 1800cm- 1) by using a Thermo Scientific Nicolet 6700 ATR FT-IR Spectrometer, in which 1-μl samples were placed on the crystal without additives and left to dry completely by an average time of 5 minutes. Data pre-processing and analysis was performed on the OriginPro8.5 and Orange software. Saliva-sample classification was performed with leave-one-out validation. Correctly classified instances were 72.7% for the control group, 65.5% for occasional smokers and 75% for smokers. Sample differences were observed in the peaks at 1076cm-1 (skeletal cis conformation of DNA and symmetric stretching of phosphate [PO2], 1403cm-1 symmetric CH3 modes of protein methyl groups and δsCH3 of collagen, 1451cm- 1 asymmetrical CH3 bending modes of the protein methyl groups, 1547cm-1 of protein band, amide II, peptide and proteins amide II, and 1646cm-1 amide I, C5 methylated cytosine, C==O bond, C==C stretching uracil and NH2 guanine.

    Palavras-Chave: neoplasms; oral cavity; tobacco smokes; fourier transformation; infrared spectra; spectroscopy; biopsy; diagnostic techniques; tobacco

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  • IPEN-DOC 28906

    SOUZA, FELIPE C.R. de; MACHADO, ALISSON R.; ROSSI, WAGNER de ; COSTA, EDER S.; AIRES, LEONARDO C.. Efeito da texturização em ferramentas de PCD no torneamento de alumínio 2011-T4. In: COLÓQUIO DE USINAGEM, 24., 25-27 de maio, 2022, Curitiba, PR. Anais... Recife, PE: Even3, 2022. DOI: 10.29327/usinagem.485690

    Abstract: A usinagem, por ser um dos processos de fabricação mais utilizado na indústria manufatureira, tem seu aprimoramento como um grande propósito entre pesquisadores. Dentre essas possíveis técnicas de aprimoramento, a texturização da ferramenta de corte é um destaque. Neste aspecto, é notório que algumas combinações de materiais são mais favoráveis à usinagem para a durabilidade das texturas durante o corte, como é o caso da usinagem do alumínio, um material dúctil e amplamente utilizado nas indústrias, aliada a uma ferramenta de alta resistência como o PCD. Esta combinação é altamente viável, pois não há desgaste significante na ferramenta, ao contrário da maioria dos casos, em que há um desgaste rápido na ferramenta que consome a textura em pequenos percursos de usinagem, diminuindo ou anulando o efeito da textura. Logo, a fim de verificar os efeitos da texturização, este trabalho realizou testes de torneamento da liga de Alumínio 2011-T4, com ferramentas de PCD com diferentes tipos de texturas e considerando a temperatura de usinagem medida por uma termocâmara infravermelha. Testes com ferramentas sem texturas (lisas) também foram conduzidos para comparação. As texturas foram usinadas por laser femtossegundos de Ti:safira, variando-se a direção, profundidade e largura dos canais. As texturas beneficiaram a segmentação do cavaco e consequentemente a dissipação do calor gerado e também o acabamento da peça. As texturas perpendiculares à aresta de corte com lubrificante foram as que apresentaram os melhores resultados em relação às ferramentas sem textura: para dimensões menores reduziu a temperatura em 9 %.

    Palavras-Chave: machining; polycrystals; aluminium; texture

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  • IPEN-DOC 28905

    SIGLER JUNIOR, EDUARDO; ROSSI, WAGNER de ; SANTANA, TATIANA D.; BARBOSA, PATRICIA A.; CARNEIRO, MARCELO B.. Avaliação de ferramenta de corte cerâmica texturizada à laser: proposta de trabalho. In: COLÓQUIO DE USINAGEM, 24., 25-27 de maio, 2022, Curitiba, PR. Anais... Recife, PE: Even3, 2022. DOI: 10.29327/usinagem.478682

    Abstract: Ferramentas cerâmicas com elevada dureza a quente, inércia química, e tenacidade promovida por adições de partículas (TiC e TiN), reforço com fibra (SiCw) e transfomação de fase (ZrO2 estabilizada), são utilizadas na usinagem de ferros fundidos, aços liga e aços endurecidos. Técnicas de texturização vem sendo empregadas em insertos de usinagem para diminuir as forças de usinagem; atrito; melhorar a rugosidade na peça; aumentar a vida útil da ferramenta. Assim, o objetivo desta proposta de trabalho é avaliar o desempenho de ferramentas de corte cerâmica a base de óxido alumínio texturizadas por laser de pulsos ultracurtos, no torneamento de ferro fundido cinzento e aço inoxidável martensítico. Além de estudar o comportamento tribológico desse material cerâmico em ensaios de microabrasão. Nos testes de usinagem serão monitorados esforços e temperatura de corte; avaliados os parâmetros de rugosidade (Ra e Rz); e circularidade e cilindricidade das peças. Como resultado espera-se compreender o comportamento da textura em ferramentas cerâmicas na usinagem de materiais que geram cavacos curtos e longos; e evidênciar o efeito da texturização na força e temperatura de usinagem; no acabamento da superfície e nos desvios geométricos da peça; além da resistência ao desgaste microabrasivo da ferramenta.

    Palavras-Chave: ceramics; cutting tools; texture; abrasives

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  • IPEN-DOC 28904

    SANTAELLA, CESAR R.K. ; COTINHO, SAMUEL P. ; CORREA, OLANDIR V. ; PILLIS, MARINA F. . Enhancement of the RE-boronizing process through the use of La, Nd, Sm, and Gd compounds / Aprimoramento do processo de boretação com terras raras por meio do uso de Nd, Sm e Gd. In: SHAEFFER, LIRIO (Ed.); ROCHA, ALEXANDRE da S. (Ed.); BRITO, ALBERTO M.G. (Ed.); SOUZA, JOAO H.C. de (Ed.); DAUDT, NATALIA de F. (Ed.) INTERNATIONAL FORGING CONFERENCE, 24th; NATIONAL SHEET METAL FORMING CONFERENCE, 23rd; INTERNATIONAL SHEET METAL FORMING CONFERENCE, 10th; BRDDRG CONGRESS, 7th; INTERNATIONAL CONFERENCE ON MATERIALS AND PROCESSES FOR RENEWABLE ENERGIES, 10th; INTERNATIONAL CONFERENCE ON SURFACE ENGINEERING IN MATERIAL FORMING, 3rd, October 13-15, 2021, Online. Proceedings... 2021.

    Abstract: Rare-earth elements have been used in the thermochemical treatment of boronizing to enhance boron diffusion. In order to further investigate the effect of these elements on the process, neodymium-, samarium-, and gadolinium were utilized for the treatment of AISI 1045 samples carried out at the temperature of 1173 K for 4 h. The resulting boride layers formed were characterized through optical microscopy, microhardness test, and X-ray diffraction (XRD). The comparison of the layers showed that the addition of neodymium increased the depth by 48%, with samarium by 54%, and with gadolinium by 76%.

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  • IPEN-DOC 28903

    REDÍGOLO, MARCELO M. ; CALVO, WILSON A.P. ; BOIANI, NATHALIA F. ; TOMINAGA, FLAVIO K. ; BORRELY, SUELI I. . Gas chromatography-mass spectrometry analysis of irradiated fluoxetine aqueous samples. In: ALAPI, TUNDE (Ed.); BERKECZ, ROBERT (Ed.); ILISZ, ISTVAN (Ed.) INTERNATIONAL SYMPOSIUM ON ANALYTICAL AND ENVIRONMENTAL PROBLEMS, 27th, November 22-23, 2021, Szeged, Hungary. Proceedings... Szeged, Hungary: University of Szeged, 2021. p. 292-296.

    Abstract: The last decade witnessed the drastic increase in the use of antidepressant drugs, being fluoxetine the most prescribed worldwide. Conventional wastewater treatment is inefficient in removing fluoxetine and its accumulation in water bodies and water living organism is inevitable. Among several methods for contaminant removal from wastewater, electron beam irradiation is an efficient and green technology. This work presents the characterization of aqueous fluoxetine samples before and after irradiation. Gas chromatography coupled to mass spectrometry was used to identify the original compound and its irradiation products. Results indicate a drastic reduction in fluoxetine presence after the irradiation process. Radiolysis pathways were proposed based on mass fragments identification.

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  • IPEN-DOC 28902

    GARCIA, VANESSA S.G. ; ROSA, JORGE M. ; SILVA, THALITA T. ; BORRELY, SUELI I. . Ecotoxicological approach of surfactants treated by ionizing radiation. In: ALAPI, TUNDE (Ed.); BERKECZ, ROBERT (Ed.); ILISZ, ISTVAN (Ed.) INTERNATIONAL SYMPOSIUM ON ANALYTICAL AND ENVIRONMENTAL PROBLEMS, 27th, November 22-23, 2021, Szeged, Hungary. Proceedings... Szeged, Hungary: University of Szeged, 2021. p. 56-60.

    Abstract: Removing surfactants from liquid effluents has been a fundamental issue since they are found in several industrial effluents, hospitals, restaurants, and even homes. When disposed into aquatic environmental, surfactants can implicate in significant changes, including several adverse effects to aquatic organisms. The present study was developed to assess the ecotoxicological effects of surfactants (anionic and nonionic) to aquatic organisms Vibrio fischeri bacteria, Daphnia similis crustacean. The ionizing radiation (Electron Beam Irradiation - EBI) was applied as a possible technology for the treatment of these contaminants in order to reduce acute toxic effects. The obtained data showed that the surfactants were toxic for both organisms, and the nonionic were more toxic than anionic. EB irradiation reduced surfactants toxicity by 40% acute toxic effects for nonionic surfactant and more than 70% for anionic, for both exposed organisms classes.

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  • IPEN-DOC 28897

    SILVA, JEFFERSON; REIS, SUELLEN; MAIA, ELOA L. ; TERADA, MAYSA ; BUGARIN, ALINE ; BERBEL, LARISSA ; ANDRADE, RAYANNE A.; GUILHERME, LUIS H.; COSTA, ISOLDA . Effect of pulsed and spray multipass MAG welding on the corrosion resistance of 316L stainless steel. In: INTERNATIONAL CORROSION CONGRESS, 21st; INTERNATIONAL CORROSION MEETING, 8th, July 20-23, 2021, Online. Anais... Rio de Janeiro, RJ: Associação Brasileira de Corrosão - ABRACO, 2021.

    Abstract: In this study, the corrosion resistance of the ASTM A-240 TP 316L stainless steel submitted to a multipass metal active gas (MAG) welding was investigated. The stainless steel was MAG welded in two modes of metal transfer: pulsed and spray with protective gas (98% Argon and 2% Oxygen). The microstructure and corrosion resistance of base metal (BM) and fusion-zone (FZ) were characterized by scanning electron microscopy (SEM), ferritescope test, and anodic polarization tests. All zones were passive in the test solution (NaCl 1.0 mol L-1) followed by passive film breakdown with a potential increase. The BM showed a higher tendency to film breakdown comparatively to the FZ. The FZ in the spray process presented a passive film with higher breakdown resistance than the pulsed FZ.

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  • IPEN-DOC 28896

    YOSHIKAWA, DANIEL S.; SANTOS, CELIA A.L.; MARTIN, RAMON V.; ALMEIDA, NEUSVALDO L. de; FARIA, RUBENS N. ; CARVALHO, MATHEUS A.; WENDHAUSEN, PAULO A.; LANDGRAF, FERNANDO J.. Corrosion behavior of NdFeB permanent magnet in two neutral environments. In: INTERNATIONAL CORROSION CONGRESS, 21st; INTERNATIONAL CORROSION MEETING, 8th, July 20-23, 2021, Online. Anais... Rio de Janeiro, RJ: Associação Brasileira de Corrosão - ABRACO, 2021.

    Abstract: The NdFeB uncoated magnets have been magnetically characterized by demagnetization curves and their corrosion behavior have been evaluated (nonmagnetized state) by accelerated, immersion and electrochemical corrosion tests. The hygrothermal corrosion resistance was evaluated by: high accelerated stress test (HAST) and bulk corrosion test (BCT). The immersion tests were performed in ultrapure water with or without addition of chloride ions. The electrochemical tests, open circuit potential (OPC) and electrochemical impedance spectroscopy (EIS) were carried out in two neutral solutions (NaCl and Na2SO4), and on the two distinct surfaces of cubic magnets, i.e. parallel and perpendicular (pole) to the crystallographic c-axis of aligned ferromagnetic grains. Both accelerated tests presented weight loss below 1.0 mg/cm2 (BCT grade A). The chloride ions additions in immersion tests caused differential aeration corrosion. The EIS tests carried out in NaCl solution were more aggressive than in Na2SO4 solution, and indicated a different corrosion behavior between the parallel and pole faces evidenced by the response of the Nyquist diagrams.

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  • IPEN-DOC 28895

    BERBEL, LARISSA O. ; VIVEIROS, BARBARA V.G. de ; MICELLI, ANA L. ; NIGRO, FREDERICO ; ROSSI, JESUALDO L. ; COSTA, ISOLDA . Corrosion of dental implants made of Ti-6Al-4V connected to 316L SS in agressive environment. In: INTERNATIONAL CORROSION CONGRESS, 21st; INTERNATIONAL CORROSION MEETING, 8th, July 20-23, 2021, Online. Anais... Rio de Janeiro, RJ: Associação Brasileira de Corrosão - ABRACO, 2021.

    Abstract: Implants made of dissimilar alloys, such as Ti-6Al-4V, connected to abutment of stainless steel (SS), are being considered for application as dental implants leading to galvanic corrosion. Body fluids are corrosive electrolytes that contain aggressive ions, such as chlorides, leading to localized attack at weak points of the passive film on materials used for implants fabrication. Another reason of apprehension concerning corrosion is the method of joining the different materials. This might lead to small gaps between the two materials and promote crevice conditions that stimulate localized corrosion. In this study, the corrosion resistance of a Morse taper dental implants made of Ti-6Al-4V alloy in contact to a prosthetic abutment of 316L, with the two parts joined by mechanical forces consisting of strikes, using different numbers of strikes (3, 5 and 7), was studied. The study was carried out by SVET technique in phosphate buffer solution (PBS) with an addition of H2O2 and pH adjust to 3 to simulate inflammatory conditions. The results showed high electrochemical activity at the interface between the two alloys. SVET maps showed that the Ti alloy acted as anode whereas the 316L SS as cathode. At the interface of the dissimilar alloys, large amounts of corrosion products accumulated showing the effect of the galvanic corrosion. This was mainly observed for the samples with 3 strikes for joining both alloys. The electrochemical activity was the lowest for the dental implant mounted with 5 strikes. SVET maps and SEM images showed a strong effect of crevice corrosion for the implants joined by lowest number of strikes among the testes.

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  • IPEN-DOC 28894

    NASCIMENTO, CAMILA B.; CALABRARO, BRUNO S.; ANJOS, DANILO F. dos; EVANGELISTA, RAFAEL; PIRIELLI, SABRINA S.; COLOSIO, MARCO A.; ROSSI, JESUALDO L. . Characterization of the corrosion behavior of sintered parts obtained by powder metallurgy with different manganese sulfide concentrations. In: INTERNATIONAL CORROSION CONGRESS, 21st; INTERNATIONAL CORROSION MEETING, 8th, July 20-23, 2021, Online. Anais... Rio de Janeiro, RJ: Associação Brasileira de Corrosão - ABRACO, 2021.

    Abstract: Powder metallurgy is a process widely used in automotive parts, such as gears and pistons. The presence of pores is an inherent characteristic of this process. This porosity directly affects machinability, thus making the surface finish of the material rough. One of the alternatives for improving machining is the addition of manganese sulfide (MnS) to the mix composition. This work aimed to investigate the corrosion behavior of an automotive part with a majority iron composition obtained by powder metallurgy with different concentrations of 0%, 0.5% and 1.0% MnS (mass %) and varied densities (5800 kg.m-³, 6200 kg.m-³ and 6600 kg.m-³) in immersion times of 1 h, 4 h, 8 h and 24 h in 3.5% NaCl solution (mass %). The work was undertaken by means of electrochemical tests (electrochemical impedance spectroscopy and potentiodynamic polarization) and microstructural characterization, before and after the immersion periods. The results obtained by electrochemical impedance spectroscopy revealed a drop in the corrosion resistance of the samples as the period of immersion in the electrolyte increased, where the condition without the presence of MnS showed higher corrosion resistance than the samples without MnS. The potentiodynamic polarization curves indicated a reduction in corrosion resistance with an increase in the percentage of MnS in the mixture composition.

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  • IPEN-DOC 28763

    BIATY, FLAVIA P. ; PALADINO, PATRICIA A.; SABUNDJIAN, GAIANE . Jogos digitais e realidade virtual como material didático. In: ENCONTRO DE INICIAÇÃO CIENTÍFICA E PÓS-GRADUAÇÃO DO CAMPUS SÃO PAULO, 6., 13-15 de dezembro, 2021, São Paulo, SP. Anais... São Paulo, SP: IFSP - Campus São Paulo, 2021. p. 1-3.

    Abstract: Neste trabalho discute-se a importância dos jogos digitais e da realidade virtual como material didático para uma aprendizagem significativa. Por meio de uma revisão bibliográfica e de discussões de um grupo de trabalho interdisciplinar e interinstitucional, constatou-se a importância dos Digital Game Based Learning (DGBL). Este tipo de jogo quando utilizado como material didático, permite um grau de flexibilidade e criatividade para o professor planejar sua sequência didática. Por outro lado, observou-se a carência de produção desse tipo de material, suas complexidades e suas limitações. Um tipo de limitação dos jogos de Realidade Virtual é a dificuldade de algumas pessoas em realizar a fusão binocular necessária para sua visualização.

    Palavras-Chave: game theory; educational tools; training; computerized simulation; digital systems; technology utilization

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  • IPEN-DOC 28762

    BIATY, FLAVIA P. ; PALADINO, PATRICIA A.; SABUNDJIAN, GAIANE . Viabilidade econômica e ambiental do uso de hidrogênio como vetor energético para transportes públicos urbanos. In: ENCONTRO DE INICIAÇÃO CIENTÍFICA E PÓS-GRADUAÇÃO DO CAMPUS SÃO PAULO, 6., 13-15 de dezembro, 2021, São Paulo, SP. Anais... São Paulo, SP: IFSP - Campus São Paulo, 2021. p. 1-3.

    Abstract: O uso do hidrogênio como vetor energético já é uma realidade no setor de transportes públicos urbanos. Uma alternativa mais limpa neste setor é particularmente importante uma vez que a queima de combustíveis fósseis impacta negativamente a qualidade ambiental e social da população. Este trabalho buscou investigar o atual panorama da viabilidade econômica e ambiental da utilização do hidrogênio como potencial vetor energético para o setor de transportes públicos urbanos, por meio de uma revisão bibliográfica. Concluiu-se que o tema envolve fatores tecnológicos, sociais, econômicos, ambientais e políticos, que necessitam de investimentos em pesquisa, desenvolvimento e inovação para sua implantação e ampliação.

    Palavras-Chave: hydrogen; sustainability; energy sources; buses; transport; urban areas; renewable energy sources

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  • IPEN-DOC 28761

    BIATY, FLAVIA P. ; JULIAO, ARTHUR P.; PALADINO, PATRICIA A.. O hidrogênio como vetor energético: produção, transporte e armazenamento. In: ENCONTRO DE INICIAÇÃO CIENTÍFICA E PÓS-GRADUAÇÃO DO CAMPUS SÃO PAULO, 6., 13-15 de dezembro, 2021, São Paulo, SP. Anais... São Paulo, SP: IFSP - Campus São Paulo, 2021. p. 1-3.

    Abstract: O hidrogênio associado às células a combustível é considerado uma alternativa energética aos combustíveis fósseis na busca por um modelo sustentável de geração de energia. Por não ser uma fonte primária de energia, há uma vasta gama de possibilidades para sua produção, transporte e armazenamento, que podem envolver fontes fósseis e gerar poluentes, conflitando com o principal benefício do uso do hidrogênio enquanto alternativa limpa. Este estudo buscou investigar, por meio de uma revisão bibliográfica, as formas de produção, transporte e armazenamento do hidrogênio concluindo que a produção mais viável, é aquela que ocorre no mesmo local do abastecimento, por meio da eletrólise.

    Palavras-Chave: hydrogen; energy sources; sustainability; environment; renewable energy sources; hydrogen storage; transport

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  • IPEN-DOC 28759

    MAGALHAES, EVELLYN S.; KUMADA, DANIEL K.; WETTER, NIKLAUS U. ; KASSAB, LUCIANA R.P.; ROSSI, WAGNER de . The influence of the different parameters used for the production of double line waveguides in Nd3+ doped TeO2-ZnO glasses by fs laser writing. In: GARCIA-BLANCO, SONIA M. (Ed.); CHEBEN, PAVEL (Ed.) SPIE PHOTONICS WEST; SPIE OPTO, January 22 - February 28, 2022, San Francisco, CA, USA. Proceedings... Bellingham, WA, USA: SPIE, 2022. p. 120040Z-1 - 120040Z-7. (Proceedings SPIE 12004, Integrated Optics: Devices, Materials, and Technologies XXVI). DOI: 10.1117/12.2610189

    Abstract: Nd3+ doped TeO2-ZnO glasses with double line waveguides produced by femtosecond (fs) laser writing technique are presented. The waveguides are written directly into these glasses using a femtosecond (fs) Ti:Sapphire laser, operating at 800 nm, delivering 30 fs pulses at 10 kHz repetition rate. Each written line is formed by several collinearly overlapping lines. When double line waveguides are produced, the light is guided in between the two lines and a negative refractive index change is produced in the region of the fs laser’s focus. However, as the absorption of the material at 800 nm (4 I9/2 → 4 F 5/2 + 2 H9/2 transition of Nd3+) is in resonance with the fs laser, the heating of the material makes writing difficult. In this context, the use of several overlapping lines represents a good alternative as the velocity of the writing can be increased to avoid, heating. We report results of output mode profile, beam quality factor M2 and refractive index change for, different parameters used for the fs laser writing. Pulse energies were 15μJ for 4 and 8 overlapping lines and 30 μJ for 2, 4 and 8 overlapping lines and the writing speed was 0.5 mm/s. The present investigation evaluates the best condition for the waveguides inscription, studying the influence of different parameters used in the writing process aiming at future photonic applications.

    Palavras-Chave: neodymium lasers; glass; waveguides; photons; lasers; doped materials

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  • IPEN-DOC 28758

    PRADO, FELIPE M. ; WETTER, NIKLAUS U. . Nd:YLF laser pumped at 797 nm with 68% slope efficiency. In: ANDREW CLARKSON, W. (Ed.); SHORI, RAMESH K. (Ed.) SPIE PHOTONICS WEST; SPIE LASE, January 22 - February 28, 2022, San Francisco, CA, USA. Proceedings... Bellingham, WA, USA: SPIE, 2022. p. 1198007-1 - 1198007-5. (Proceedings SPIE 11980, Solid State Lasers XXXI: Technology and Devices). DOI: 10.1117/12.2608967

    Abstract: We demonstrate a Nd:YLiF4 laser emitting at the 1053nm transition while side-pumped at 797nm by a VBG equipped diode. Initially, a plane-concave cavity is employed using a total internal reflection at the crystal pump face. The laser operated in QCW-mode and produced 68% of slope and 66% of optical efficiency with 67 W of peak output power, while having a multimode beam quality. These efficiencies are the highest ever reported for the Nd:YLF4 pumped at 800nm.

    Palavras-Chave: neodymium lasers; lasers; solid state lasers; optical pumping; diode-pumped solid state lasers

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  • IPEN-DOC 28757

    BORDON, CAMILA D.S.; WETTER, NIKLAUS U. ; ROSSI, WAGNER de ; KASSAB, LUCIANA R.P.. Fs laser writing in Nd3+ doped GeO2-PbO glasses for the production of a new double line waveguide architecture for photonic applications. In: GARCIA-BLANCO, SONIA M. (Ed.); CHEBEN, PAVEL (Ed.) SPIE PHOTONICS WEST; SPIE OPTO, January 22 - February 28, 2022, San Francisco, CA, USA. Proceedings... Bellingham, WA, USA: SPIE, 2022. p. 120040Y-1 - 120040Y-6. (Proceedings SPIE 12004, Integrated Optics: Devices, Materials, and Technologies XXVI). DOI: 10.1117/12.2610155

    Abstract: A new double line waveguide architecture produced in Nd3+ doped GeO2-PbO glasses is presented for photonic applications. These glasses produced with the melt quenching technique have interesting characteristics that make them attractive for photonic applications: large transmission window (400–5000 nm), large polarizability, low melting temperature (1200° C) with respect to silicates, low cut-off phonon energy (~800 cm-1), large mechanical resistance, high chemical durability and high refractive index (~2.0). The double line waveguides are written directly into Nd3+ doped GeO2-PbO glasses using a Ti:Sapphire femtosecond (fs) laser, operating at 800 nm, delivering 30 fs pulses at 10 kHz repetition rate. The two written lines that form the double waveguide are formed by several collinearly overlapping lines. Results of the output mode profile, the M2 beam quality factor at 632 and 1064 nm and refractive index change are presented, as well as the parameters used for laser writing. Double waveguides written with 4 and 8 overlapping lines, writing speed of 0.5 mm/s and pulse energy of 30 μJ demonstrated to be adequate parameters for writing; refractive index changes of ~10-3 were found at 632 nm for all the cases. The present results demonstrated that Nd3+ doped GeO2-PbO glasses with the new double line waveguide architecture are promising materials for the fabrication of passive and active components for photonic applications. Further investigation will focus on the influence of the writing parameters on the optical performance of the different waveguides, and evaluate the potential of the materials as optical amplifiers at 1064 nm.

    Palavras-Chave: optical systems; waveguides; lasers; processing; germanates; glass

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  • IPEN-DOC 28756

    DIPOLD, JESSICA ; MAGALHAES, EVELLYN S.; BORDON, CAMILA D.S.; KASSAB, LUCIANA R.P.; WETTER, NIKLAUS U. . Emission properties study of a Nd3+ doped TZA glass random laser. In: JIANG, SHIBIN (Ed.); DIGONNET, MICHEL J.F. (Ed.) SPIE PHOTONICS WEST; SPIE OPTO, January 22 - February 28, 2022, San Francisco, CA, USA. Proceedings... Bellingham, WA, USA: SPIE, 2022. p. 119970I-1 - 119970I-6. (Proceedings SPIE 11997, Optical Components and Materials XIX). DOI: 10.1117/12.2610107

    Abstract: Random lasers (RLs) have been thoroughly studied for applications such as high definition speckle free imaging, lithography, miniature spectroscopy, etc. RLs made with crystalline powders have shown promising results, with high emission efficiencies and narrow wavelength bandwidth. However, few studies on glass random lasers have been made, since its inhomogeneous broadening make it hard to verify the linewidth narrowing characteristic of laser emission. Here, we describe linewidth and temporal measurements for a TZA glass doped with 16 wt% neodymium. We verified a 0.5 nm linewidth narrowing at laser threshold. The pump intensity where the transition occurs coincided with the appearance of a faster emission decay, showing the presence of laser emission for higher pump power energies. This result is promising in understanding random lasing for glass powders.

    Palavras-Chave: lasers; randomness; neodymium ions; glass; doped materials; rare earths

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  • IPEN-DOC 28755

    BERECZKI, A. ; WETTER, NIKLAUS U. . Adaptive, high-power, dynamically stable ring resonator. In: ILCHENKO, VLADIMIR S. (Ed.); ARMANI, ANDREA M. (Ed.); SHELDAKOVA, JULIA V. (Ed.) SPIE PHOTONICS WEST; SPIE LASE, January 22 - February 28, 2022, San Francisco, CA, USA. Proceedings... Bellingham, WA, USA: SPIE, 2022. p. 1198705-1 - 1198705-6. (Proceedings SPIE 11987, Laser Resonators, Microresonators, and Beam Control XXIV). DOI: 10.1117/12.2610220

    Abstract: Dynamically stable resonators have a stationary TEM00 beam waist inside the laser rod (w30), which is minimal throughout the stability interval and insensitive to changes in pump power. For a given set of resonator parameters (mirror radii and distances between mirrors and rods), the stability interval parameters, which are the limits of the stability interval in terms of the rod’s thermally induced focusing length are determined. In linear resonators, these stability interval parameters cannot be changed independently only by varying resonator distances, and mirrors of different curvature have to be employed. However, our group showed recently that for a symmetric ring resonator containing a pair of curved mirrors, the width of stability interval and the stability interval limit at maximum rod’s focal length can be adjusted continuously and independently only by varying resonator distances once the mirror radius of curvature has been fixed. In this work we demonstrate a project of an adaptive ring resonator that allows the TEM00 - mode resonator to be continuously tuned throughout the whole range of pump powers utilizing standard electromechanics to move the mirrors. Additionally for a given value of pump power, w30 can be varied, thus allowing different beam qualities to be obtained from the same resonator.

    Palavras-Chave: resonators; stability; ring lasers; mirrors; power; pumps

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  • IPEN-DOC 28749

    GOMES, DANIEL de S. . Computational assessment using sensitivity analysis of more tolerant fuels. In: BRAZILIAN CONGRESS OF THERMAL SCIENCES AND ENGINEERING, 18th, November 16-20, 2020, Online. Proceedings... Rio de Janeiro, RJ: Associação Brasileira de Engenharia e Ciências Mecânicas - ABCM, 2020.

    Abstract: The secure operation of nuclear technology, including the avoidance of nuclear accidents and the optimal use of fuel cycles, poses a significant challenge. As of 2020, a total of 442 nuclear reactors are in operation in 30 countries across the world, accounting for over 13% of the global electricity demand. Over the last 50 years, light water reactors have operated using uranium dioxide as fuel and zirconium alloys as cladding. However, extensive research on more tolerant fuels has been conducted with high priority since the Fukushima disaster in 2011. New tolerance ideals seek the replacement of the standard fuel system with state-of-the-art options soon. Such investigations have predominantly focused on the responses and physical properties of new candidates for tolerant fuels, which are superior to those of standard fuel systems, based on close time-advanced alloys manufactured by substituting zirconium alloys with FeCrAl for enhanced corrosion resistance. Further, more tolerant fuels exhibit high uranium densities, with better thermal conductivities than uranium dioxide. This study proposes a fuel-licensing code as safety criteria collaborating with stochastic models and conservative rules. It also incorporates a sensitivity analysis using U3Si2 as fuel and FeCrAl alloys as cladding.

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  • IPEN-DOC 23982

    COSTA, ISOLDA ; RAMANATHAN, LALGUDI V. . Influência do tratamento superficial sobre o comportamento de oxidação do zircônio e zircaloy-4. In: SEMINÁRIO NACIONAL DE CORROSÃO, 13, 12-16 de maio, 1986, Rio de Janeiro, RJ. Anais... 1986. p. 219-227.

    Abstract: Neste trabalho estuda-se a influencia da concentração de fluoretos na solução de tratamento superficial sobre o comportamento de oxidação do zircônio e zircaloy-4, no intervalo de temperatura de 350 a 7600C, através de analise termogravimétrica. Foram utilizadas duas soluções cujas concentrações de acido fluorídrico eram diferentes, sendo medidas as rugosidades das amostras após os tratamentos artificiais. A influencia da concentração do íon fluoreto sobre o comportamento de oxidação e significativa para temperaturas mais elevadas.

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  • IPEN-DOC 23955

    MENNUCCI, MARINA M. ; COSTA, ISOLDA . Investigation of corrosion inhibitors for carbon steel used as reinforcement of concrete in artificial pore solution. In: EUROPEAN CORROSION CONGRESS, September 4-8, 2005, Lisbon, Portugal. Proceedings... 2005. p. 1-7.

    Abstract: The aim of this study was to evaluate the potential application of some chemical compounds as corrosion inhibitors for a carbon steel (CA-50) used as reinforcement of concrete in artificial pore solution. The tested compounds were sodium nitrite (1.5% in mass), hexamethylenetetramine (1.5% in mass) and benzotriazole (10-2 M). The techniques used in this investigation were electrochemical impedance spectroscopy (EIS), potentiodynamic polarization tests and open circuit potential measurements as a function of time. Each compound tested was added to a solution whose composition simulates that of the liquid inside the pores of concretes. To this solution was also added sodium chloride (3.5% in mass) to simulate the corrosive effects of marine atmospheres. The corrosion resistance of the carbon steel (CA-50) was evaluated in the solutions with and without the additives. A beneficial effect (corrosion resistance increase) was found for all types of inhibitors tested, but sodium nitrite and benzotriazole showed a significant inhibiting effect.

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  • IPEN-DOC 23954

    FERREIRA JUNIOR, JOSE M. ; TOMACHUK, CELIA R. ; ROSSI, JESUALDO L. ; SANTOS, WAGNER I.A. ; HINDER, STEVE J.; BAKER, MARK A.; COSTA, ISOLDA . A combination of cerium and niobium treatments for corrosion protection of electrogalvanized steel. In: INTERNATIONAL SYMPOSIUM ON ELECTROCHEMICAL METHODS IN CORROSION RESEARCH, 10th, November 18-23, 2012, Maragogi, AL. Proceedings... 2012.

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  • IPEN-DOC 23953

    SANTOS, WAGNER I.A. ; FERREIRA JUNIOR, JOSE M. ; OLIVEIRA, MARCELO de ; BAKER, MARK A.; HINDER, STEVE J.; COSTA, ISOLDA . Corrosion protection of the clad on AA2024-T3 by cerium based conversion coatings. In: INTERNATIONAL SYMPOSIUM ON ELECTROCHEMICAL METHODS IN CORROSION RESEARCH, 10th, November 18-23, 2012, Maragogi, AL. Proceedings... 2012.

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  • IPEN-DOC 23650

    RAMIREZ, ALEXANDER H. ; RAMIREZ, CRISTIAANN H. ; COSTA, ISOLDA . Influence of cold deformation on semiconducting properties of the ISO NBR 5832-1 austenitic stainless steel. In: INTERNATIONAL SYMPOSIUM ON ELECTROCHEMICAL METHODS IN CORROSION RESEARCH, 10th, November 18-23, 2012, Maragogi, AL. Proceedings... 2012.

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  • IPEN-DOC 23568

    TERADA, MAYSA; MARQUES, ROGERIO A. ; PADILHA, ANGELO F.; COSTA, ISOLDA . Investigation of passive layers of incoloy MA 956 and DIN 1.4575 for odontological applications. In: INTERNATIONAL SYMPOSIUM ON ELECTROCHEMICAL METHODS IN CORROSION RESEARCH, 10th, November 18-23, 2012, Maragogi, AL. Proceedings... 2012.

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  • IPEN-DOC 23553

    OLIVEIRA, MARCELO ; FERREIRA JUNIOR, JOSE M. ; SANTOS, WAGNER I.A dos ; TOMACHUK, CELIA R. ; ROSSI, JESUALDO L. ; COSTA, ISOLDA . Passivation treatments for galvanized steel as potential replacements to chromate conversion coatings. In: INTERNATIONAL SYMPOSIUM ON ELECTROCHEMICAL METHODS IN CORROSION RESEARCH, 10th, November 18-23, 2012, Maragogi, AL. Proceedings... 2012.

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  • IPEN-DOC 23218

    SOUZA, KELLIE P. de ; TOMACHUK, CELIA R. ; PALOMINO, LUIS E.M.; COSTA, ISOLDA . Passivation of electrogalvanized steel with conversion coatings in Cr VI-free solutions. In: INTERNATIONAL SYMPOSIUM ON ELECTROCHEMICAL METHODS IN CORROSION RESEARCH, 10th, November 18-23, 2012, Maragogi, AL. Proceedings... 2012.

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  • IPEN-DOC 23112

    SOUZA, KELLIE P. de ; TOMACHUK, CELIA R. ; PALOMINO, LUIS E.M.; COSTA, ISOLDA . Study of zirconium addition on Cr VI-free passivating layers applied on zinc coated steel. In: INTERNATIONAL SYMPOSIUM ON ELECTROCHEMICAL METHODS IN CORROSION RESEARCH, 10th, November 18-23, 2012, Maragogi, AL. Proceedings... 2012.

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  • IPEN-DOC 23052

    ABREU, CAIO P. ; SILVA, LUCIANO M.; GRANDINI, CARLOS R.; ASSIS, SERGIO L. ; COSTA, ISOLDA . The effect of heat treatment on the corrosion resistance of Ti and Ti-Nb alloys in fluoride solution. In: INTERNATIONAL SYMPOSIUM ON ELECTROCHEMICAL METHODS IN CORROSION RESEARCH, 10th, November 18-23, 2012, Maragogi, AL. Proceedings... 2012.

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  • IPEN-DOC 23007

    SANTOS, H.O. ; KUNIOSHI, C.T. ; ROSSI, J.L. ; COSTA, I. ; REIS, F.M.. Corrosion behaviour of hypereutectic Al-Si-Cu alloys used in cylinder liners. In: SAE WORLD CONGRESS, April 11-14, 2005, Detroit, Michigan. Proceedings... SAE TECHNICAL PAPER, 2005. DOI: 10.4271/2005-01-0539

    Abstract: In this study, the corrosion resistance of four Al-Si hypereutectic alloys has been investigated in a solution of chemical composition typical of the condensed solution from automotive fuel combustion products - here named automotive synthetic condensed solution. The significance of the undertaken study was in the evaluation of materials used for cylinder liners fabrication in relation to the Brazilian motor fuel. Three commercial Al-Si alloys that have been used for cylinder liners and a laboratory made alloy (Osprey Process) were evaluated by electrochemical impedance spectroscopy measurements at increasing times of immersion in this solution. The surfaces of the alloys were evaluated before and after corrosion test by scanning electron microscopy and. Although the corrosion mechanisms present similarities for all the commercial alloys investigated, the results also indicated different corrosion resistances for these alloys, and these were related to their microstructure characteristics. The laboratory prepared alloy showed increased susceptibility to pitting corrosion comparatively to the commercial alloys.

    Palavras-Chave: eutectics; corrosion resistance; alloy systems; mechanical properties; cylinders

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  • IPEN-DOC 23006

    MENNUCCI, MARINA M. ; COSTA, ISOLDA . Investigação do potencial de aplicação do benzotriazol como inibidor de corrosão do aço carbono CA-50 em meio alcalino. In: CONGRESSO LATINO AMERICANO DE CORROSÃO, May 21-26, 2006, Fortaleza, CE. Proceedings... 2006. p. 1-6.

    Abstract: O objetivo deste trabalho foi avaliar a proteção frente à corrosão do aço carbono CA-50, devido ao ataque por íons cloreto em meio alcalino, por inibidores de corrosão, especificamente o nitrito de sódio e o benzotriazol. O aço CA-50 é um dos mais utilizados para armaduras em estruturas de concreto armado. A concentração utilizada, de ambos os aditivos, foi 0,5 % em massa. A eficiência dos compostos foi avaliada em meio que simula a composição química da água de poro com adição de cloreto, por métodos eletroquímicos, especificamente curvas de polarização potenciodinâmica e espectroscopia de impedância eletroquímica. Observou-se efeito benéfico nos dois tipos de inibidores testados, sendo que o benzotriazol obteve uma melhor eficiência na concentração adotada. Os resultados indicaram que o benzotriazol pode ser uma alternativa viável à substituição do nitrito em aplicações de construção civil, isto é, em meios alcalinos, principalmente devido às vantagens de menor toxicidade.

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A elaboração do projeto do RI do IPEN foi iniciado em novembro de 2013, colocado em operação interna em julho de 2014 e disponibilizado na Internet em junho de 2015. Utiliza o software livre Dspace, desenvolvido pelo Massachusetts Institute of Technology (MIT). Para descrição dos metadados adota o padrão Dublin Core. É compatível com o Protocolo de Arquivos Abertos (OAI) permitindo interoperabilidade com repositórios de âmbito nacional e internacional.

O gerenciamento do Repositório está a cargo da Biblioteca do IPEN. Constam neste RI, até o presente momento 20.950 itens que tanto podem ser artigos de periódicos ou de eventos nacionais e internacionais, dissertações e teses, livros, capítulo de livros e relatórios técnicos. Para participar do RI-IPEN é necessário que pelo menos um dos autores tenha vínculo acadêmico ou funcional com o Instituto. Nesta primeira etapa de funcionamento do RI, a coleta das publicações é realizada periodicamente pela equipe da Biblioteca do IPEN, extraindo os dados das bases internacionais tais como a Web of Science, Scopus, INIS, SciElo além de verificar o Currículo Lattes. O RI-IPEN apresenta também um aspecto inovador no seu funcionamento. Por meio de metadados específicos ele está vinculado ao sistema de gerenciamento das atividades do Plano Diretor anual do IPEN (SIGEPI). Com o objetivo de fornecer dados numéricos para a elaboração dos indicadores da Produção Cientifica Institucional, disponibiliza uma tabela estatística registrando em tempo real a inserção de novos itens. Foi criado um metadado que contém um número único para cada integrante da comunidade científica do IPEN. Esse metadado se transformou em um filtro que ao ser acionado apresenta todos os trabalhos de um determinado autor independente das variáveis na forma de citação do seu nome.