Eventos - Artigos

 

Submissões recentes

  • IPEN-DOC 30196

    SILVA, ANA C.K. de S. ; ZAMBONI, CIBELE B. ; SILVA, DALTON G.N. da . X-ray investigation of graphic art / Investigação de arte gráfica por raios X. In: SEVEN INTERNATIONAL MULTIDISCIPLINARY CONGRESS, 3rd, June 1-2, 2023, Online. Proceedings... São José dos Pinhais, PR: Home Publishing Brazil, 2023. DOI: 10.56238/sevenIIImulti2023-195

    Abstract: X-rays produced by electron ionization provide an analytical tool that can assist investigations in the field of Artistic and Cultural Heritage. In this study, the technique of Energy Dispersive X-ray Fluorescence (EDXF) was employed to investigate collections of postcards from the 1960s produced in Brazil, London and Uruguay. The collections belong to private collections and were made available for analysis at the Radiation Spectroscopy and Spectrometry Laboratory of the Institute for Nuclear and Energy Research (IPEN). This technique is non-destructive and allows the identification of chemical elements present in the different chemical formulations used in the printing industries of each country in the process of preparing postcards. This information allows tracing their origin and identifying copies/fakes, which enables their cataloging and registration for exhibition, as well as providing subsidies for conservators and restorers regarding the preservation and storage of these artistic materials.

    Como referenciar este item
    Icon

  • IPEN-DOC 30195

    SILVA, RUBENS C. da; MORAIS, PAULO J.D. de; CARVALHO, ANDRE; ROSSI, WAGNER de ; MOTTA, CLAUDIO C.. Thermophoretic efficiency in the MCVD process: a CFD modeling. In: INTERNATIONAL CONFERENCE ON OPTICAL MEMS AND NANOPHOTONICS; SBFOTON INTERNATIONAL OPTICS AND PHOTONICS CONFERENCE, July 31 - August 3, 2023, Campinas, SP. Proceedings... Piscataway, NJ, USA: IEEE, 2023. DOI: 10.1109/OMN/SBFOTONIOPC58971.2023.10230917

    Abstract: The thermophoretic efficiency in the modified chemical vapour deposition (MCVD) process has been numerically determined under specified conditions of temperature and velocity field in the silica deposition tube. A CFD code was used to solve a steady-state numerical model of the MCVD process. The cumulative efficiency of SiO2 and GeO2 deposition was calculated along the tube length, yielding to a maximum value of 42% and 37 % respectivelly.

    Como referenciar este item
    Icon

  • IPEN-DOC 30194

    ZUFFI, ARMANDO V.F. ; SANTOS, JHONATHA R. dos ; SAMAD, RICARDO E. . Ionization model to estimate the density and temperature of fs-laser-induced plasmas in air. In: INTERNATIONAL CONFERENCE ON OPTICAL MEMS AND NANOPHOTONICS; SBFOTON INTERNATIONAL OPTICS AND PHOTONICS CONFERENCE, July 31 - August 3, 2023, Campinas, SP. Proceedings... Piscataway, NJ, USA: IEEE, 2023. DOI: 10.1109/OMN/SBFOTONIOPC58971.2023.10230914

    Abstract: We present a simple ionization model to assess the density of plasmas created in air by ionization induced by the electric field of ultrashort laser pulses. It calculates the average ionization induced by the laser taking into account the known threshold intensities for each ionic state, the beam spatial profile and the atmospheric composition, estimating the plasma density. The model density predictions are compared to experimental results obtained by a time-resolved Mach-Zehnder-like interferometer, and are also used as entry parameters to evaluate the plasma temperature by the Saha equation.

    Como referenciar este item
    Icon

  • IPEN-DOC 30193

    WETTER, NIKLAUS U. ; VIEIRA, RENATO J.R. ; SILVA, DANILO M. da ; JORGE, KELLY C. ; JIMENEZ-VILLAR, ERNESTO ; GIEHL, JULIA M. ; MIRANDA, ADRIANA R. de ; DIPOLD, JESSICA . Random lasers: review of research activities at IPEN. In: INTERNATIONAL CONFERENCE ON OPTICAL MEMS AND NANOPHOTONICS; SBFOTON INTERNATIONAL OPTICS AND PHOTONICS CONFERENCE, July 31 - August 3, 2023, Campinas, SP. Proceedings... Piscataway, NJ, USA: IEEE, 2023. DOI: 10.1109/OMN/SBFotonIOPC58971.2023.10230975

    Abstract: Random lasers offer advantages such as low-cost fabrication and robustness in harsh environments and have applications in sensing, imaging, communications, and security. Our current research focuses on advanced materials, active control techniques, integration with other photonic structures, and exploration of Anderson localization and polydisperse effects. Coherent feedback in cavity-enhanced random lasers is discussed as means to achieve specific emission characteristics, and emission at 1300 nm is shown for the first time.

    Como referenciar este item
    Icon

  • IPEN-DOC 30192

    FAROOQ, SAJID ; GERMANO, GLEICE ; STANCARI, KLEBER A. ; RAFFAELI, ROCIO; CROCE, MARIA V.; CROCE, ADELA E.; ZEZELL, DENISE M. . A 3D discriminant analysis for hyperspectral FTIR images. In: INTERNATIONAL CONFERENCE ON OPTICAL MEMS AND NANOPHOTONICS; SBFOTON INTERNATIONAL OPTICS AND PHOTONICS CONFERENCE, July 31 - August 3, 2023, Campinas, SP. Proceedings... Piscataway, NJ, USA: IEEE, 2023. DOI: 10.1109/OMN/SBFOTONIOPC58971.2023.10230933

    Abstract: Here, we apply a 3D discriminant analysis approach to analyze FTIR hyperspectral images of normal vs malignant Melanoma (MM) samples for skin cancer diagnosis. For this porpose we used 2 samples, for Normal (49k) and for MM(90k). Our results evidence the outstanding performance with accuracy up to 81% for big data (> 100k).

    Como referenciar este item
    Icon

  • IPEN-DOC 30191

    ROMANO, FERNANDO C. ; WETTER, NIKLAUS U. . Transverse electromagnetic modes simulation and experimental measurement technique for a single stripe laser diode. In: INTERNATIONAL CONFERENCE ON OPTICAL MEMS AND NANOPHOTONICS; SBFOTON INTERNATIONAL OPTICS AND PHOTONICS CONFERENCE, July 31 - August 3, 2023, Campinas, SP. Proceedings... Piscataway, NJ, USA: IEEE, 2023. DOI: 10.1109/OMN/SBFOTONIOPC58971.2023.10230954

    Abstract: A single stripe multimode laser diode software model has been developed. In addition, a method for measuring the transverse electromagnetic modes (TEM) in the RF spectrum through a frequency beating process was also developed. For supporting the TEM readings, a spectrum analyzer was applied and converted the temporal signals to the frequency domain using the fast Fourier transform (FFT) method.

    Como referenciar este item
    Icon

  • IPEN-DOC 30190

    PRADO, FELIPE M. ; SOUZA, PEDRO H.M. de; SILVA, SIDNEY L. da; WETTER, NIKLAUS U. . Photoelastic dispersion coefficient by holographic reconstruction with neural networks and the Fresnel method. In: INTERNATIONAL CONFERENCE ON OPTICAL MEMS AND NANOPHOTONICS; SBFOTON INTERNATIONAL OPTICS AND PHOTONICS CONFERENCE, July 31 - August 3, 2023, Campinas, SP. Proceedings... Piscataway, NJ, USA: IEEE, 2023. DOI: 10.1109/OMN/SBFOTONIOPC58971.2023.10230956

    Abstract: Here we report the characterization of the photoelastic dispersion coefficient using digital holography with two distinct reconstruction methods: one based on the Fresnel method and the other utilizing convolutional neural networks (CNN). The CNN was trained with reconstruction from the Fresnel method and was able to provide reconstructions with an average Mean Squared Error of 0.006.

    Como referenciar este item
    Icon

  • IPEN-DOC 30189

    PRADO, FELIPE M. ; FRANCO, TOMAS J.; WETTER, NIKLAUS U. . Highly-efficient, dual-wavelength Nd:YLF laser emitting at 1314 nm and 1047 nm. In: INTERNATIONAL CONFERENCE ON OPTICAL MEMS AND NANOPHOTONICS; SBFOTON INTERNATIONAL OPTICS AND PHOTONICS CONFERENCE, July 31 - August 3, 2023, Campinas, SP. Proceedings... Piscataway, NJ, USA: IEEE, 2023. DOI: 10.1109/OMN/SBFOTONIOPC58971.2023.10230922

    Abstract: We report a record optical-to-optical efficiency of 43% and a slope efficiency of 48% for a Nd: YLF laser emitting at 1314 nm. The crystal was side-pumped by a VBG-equipped diode emitting at 797 mn, with a peak power of 1545 W. We also report simultaneous dual-wavelength emission, at 1313 nm and 1047 nm.

    Como referenciar este item
    Icon

  • IPEN-DOC 30188

    PERES, DANIELLA L. ; FAROOQ, SAJID ; RAFFAELI, ROCIO; CROCE, MARIA V.; CROCE, ADELA E.; ZEZELL, DENISE M. . Identification of basal cell carcinoma skin cancer using FTIR and Machine learning. In: INTERNATIONAL CONFERENCE ON OPTICAL MEMS AND NANOPHOTONICS; SBFOTON INTERNATIONAL OPTICS AND PHOTONICS CONFERENCE, July 31 - August 3, 2023, Campinas, SP. Proceedings... Piscataway, NJ, USA: IEEE, 2023. DOI: 10.1109/OMN/SBFOTONIOPC58971.2023.10230945

    Abstract: Here we applied ATR-FTIR spectroscopy combined with computational modeling based on 3D-discriminant analysis (3D-PCA-QDA). Our results present an exceptional performance of 3D-discriminant algorithms to diagnose BCC skin cancer, indicating the accuracy up to 99%.

    Como referenciar este item
    Icon

  • IPEN-DOC 30187

    BRANDAO, VITORIA M.C. ; SAMAD, RICARDO E. . Development of an Imaging System for an Electron Spectrometer for laser-accelerated electrons. In: INTERNATIONAL CONFERENCE ON OPTICAL MEMS AND NANOPHOTONICS; SBFOTON INTERNATIONAL OPTICS AND PHOTONICS CONFERENCE, July 31 - August 3, 2023, Campinas, SP. Proceedings... Piscataway, NJ, USA: IEEE, 2023. DOI: 10.1109/OMN/SBFotonIOPC58971.2023.10230979

    Abstract: We present the results of an electron spectrometer with an imaging system to determine the energy spectrum of laser accelerated electrons. The spectrometer is composed by a region with a constant magnetic field that deflects relativistic electrons according to their kinetic energy, and a luminescent screen into which the electrons impinge. The imaging system optimizes the collection of the screen luminescence, which is inside a vacuum chamber, and magnifies it, through a window, into a CCD in atmosphere that records the light pattern, from which the energy spectrum is recovered.

    Como referenciar este item
    Icon

  • IPEN-DOC 30186

    FAROOQ, SAJID ; PERES, DANIELLA L. ; CAIXETA, DOUGLAS C.; LIMA, CASSIO; SILVA, ROBINSON S. da; ZEZELL, DENISE M. . Monitoring changes in urine from diabetic rats using ATR-FTIR and Machine Learning. In: INTERNATIONAL CONFERENCE ON OPTICAL MEMS AND NANOPHOTONICS; SBFOTON INTERNATIONAL OPTICS AND PHOTONICS CONFERENCE, July 31 - August 3, 2023, Campinas, SP. Proceedings... Piscataway, NJ, USA: IEEE, 2023. DOI: 10.1109/OMN/SBFOTONIOPC58971.2023.10230957

    Abstract: Here, we aim to better characterize diabetes mellitus (DM) by analyzing 149 urine spectral samples, comprising of diabetes versus healthy control groups employing ATR-FTIR spectroscopy, combined with a 3D discriminant analysis machine learning approach. Our results depict that the model is highly precise with accuracy close to 100%.

    Como referenciar este item
    Icon

  • IPEN-DOC 30185

    DIPOLD, JESSICA ; BORDON, CAMILA D.S.; MAGALHAES, EVELLYN S.; KASSAB, LUCIANA R.P.; JIMENEZ-VILLAR, ERNESTO; WETTER, NIKLAUS U. . Random laser emission in Nd3+ doped tellurite glass. In: INTERNATIONAL CONFERENCE ON OPTICAL MEMS AND NANOPHOTONICS; SBFOTON INTERNATIONAL OPTICS AND PHOTONICS CONFERENCE, July 31 - August 3, 2023, Campinas, SP. Proceedings... Piscataway, NJ, USA: IEEE, 2023. DOI: 10.1109/OMN/SBFOTONIOPC58971.2023.10230929

    Abstract: Random lasers are easier and cheaper to manufacture than regular ones, being made of several materials such as polymers, powders or dyes. Glass random lasers have been rarely studied due to their inhomogeneous broadened emission and low damage threshold. Here, we study Nd 3 +doped Te0 2 -ZnO-Al 2 0 3 glasses with different concentrations of rare-earth doping (4 wt.%, 8 wt.% and 16 wt.%). Emission intensity per pump fluence and fluorescence decay time measurements showed the potential of these glasses for random laser applications in the near-infrared region.

    Como referenciar este item
    Icon

  • IPEN-DOC 30184

    CATARINA, MARCUS V. ; BERECZKI, ALLAN ; WETTER, NIKLAUS U. . Sub-nanosecond microchip oscillator for a MOPA system tailored for tattoo removal. In: INTERNATIONAL CONFERENCE ON OPTICAL MEMS AND NANOPHOTONICS; SBFOTON INTERNATIONAL OPTICS AND PHOTONICS CONFERENCE, July 31 - August 3, 2023, Campinas, SP. Proceedings... Piscataway, NJ, USA: IEEE, 2023. DOI: 10.1109/OMN/SBFOTONIOPC58971.2023.10230921

    Abstract: In this work we study a microchip laser designed to function as an oscillator in a Master-Oscillator Power-Amplifier (MOPA) system targeted for laser tattoo removal. Different configurations of the Nd: YAG resonator were used by changing the output coupler mirror reflectivities and the initial transmission of the Q-switch. The quasi-CW resonator provided 55.4 W of output with 51.31% and 78.2% optical and slope efficiencies, respectively. For Q-switched operation, the best configuration resulted in a peak output power of 3.6 MW with 588 ps pulse width.

    Como referenciar este item
    Icon

  • IPEN-DOC 30183

    BERECZKI, ALLAN ; MENEZES, FELIPE C. de ; WETTER, NIKLAUS U. . Compact, high power CW ring laser resonator. In: INTERNATIONAL CONFERENCE ON OPTICAL MEMS AND NANOPHOTONICS; SBFOTON INTERNATIONAL OPTICS AND PHOTONICS CONFERENCE, July 31 - August 3, 2023, Campinas, SP. Proceedings... Piscataway, NJ, USA: IEEE, 2023. DOI: 10.1109/OMN/SBFotonIOPC58971.2023.10230968

    Abstract: We demonstrated the dynamically stable operation of aNd: YAG ring laser with 51.8 W of linearly polarized, continuous output power. The laser was based on laser modules side-pumped by diode bars. The resonator, aimed at single-frequency operation, is a design improvement from a previous work with the resonator length 4.3 times smaller than the previous design, thus resulting in a larger free spectral range, favoring for operation at single-frequency.

    Como referenciar este item
    Icon

  • IPEN-DOC 30103

    PRADO, FELIPE M. ; SOUZA, PEDRO H.M. de; SILVA, SIDNEY L. da; WETTER, NIKLAUS U. . Photoelastic dispersion coefficient analysis of epoxy regin samples with and without dental implants. In: FRONTIERS IN OPTICS; LASER SCIENCE, October 9-12, 2023, Tacoma, WA, USA. Proceedings... Washington, DC, USA: Optica Publishing Group, 2023. DOI: 10.1364/FIO.2023.JTu7C.4

    Abstract: We characterize the dispersion coefficient of epoxy resin samples using Photoelasticity and digital holography. Furthermore, we analyzed the change in its coefficient with an added ceramic dental implant using traditional Photoelasticity.

    Como referenciar este item
    Icon

  • IPEN-DOC 30102

    PRADO, FELIPE M. ; FRANCO, TOMAS J.; VIEIRA, TARCIO de A. ; DEANA, ALESSANDRO M. ; WETTER, NIKLAUS U. . Results in highly-efficient side-pumped Nd:YLF lasers. In: FRONTIERS IN OPTICS; LASER SCIENCE, October 9-12, 2023, Tacoma, WA, USA. Proceedings... Washington, DC, USA: Optica Publishing Group, 2023. DOI: 10.1364/FIO.2023.JTu5A.49

    Abstract: Here we present resents advancements in Nd:YLF lasers, achieving record-breaking efficiency and output energies. In Q-switched operation, we obtained output energy of 41.2 mJ with peak power of 46 MW. Furthermore, we achieved a near quantum-defect slope efficiency of 78.2%, the highest reported for Nd:YLF lasers. We also present efficient 1314 nm laser emission.

    Como referenciar este item
    Icon

  • IPEN-DOC 30050

    DIPOLD, JESSICA ; WETTER, NIKLAUS U. ; FREITAS, ANDERSON Z. ; MARQUES, FRANCISCO C.; DOGARIU, ARISTIDE; JIMENEZ-VILLAR, ERNESTO . Raman enhancement induced by localization of light (TiO2@Silica plus silica nanoparticles). In: CONFERENCE ON LASERS AND ELECTRO-OPTICS: FUNDAMENTAL SCIENCE, May 7-12, 2023, San Jose, CA, USA. Proceedings... Washington, DC, USA: Optica Publishing Group, 2023. DOI: 10.1364/CLEO_FS.2023.FTh1B.7

    Abstract: Strong enhancement of the Raman signal is observed in ethanol suspension of TiO2@Silica, being stronger as the TiO2@Silica filling fraction is increased above threshold, and when silica nanoparticles are added.

    Como referenciar este item
    Icon

  • IPEN-DOC 30049

    WETTER, NIKLAUS U. ; PRADO, FELIPE M. ; VIEIRA, TARCIO de A. ; DEANA, ALESSANDRO M. . Modern diode pumped solid state lasers. In: CONFERENCE ON LASERS AND ELECTRO-OPTICS: APPLICATIONS AND TECHNOLOGY, May 7-12, 2023, San Jose, CA, USA. Proceedings... Washington, DC, USA: Optica Publishing Group, 2023. DOI: 10.1364/CLEO_AT.2023.ATu3R.1

    Abstract: A brief review of the advances in diode-pumped, Neodymium-doped, high-efficiency lasers is presented, showing how different configurations were able to achieve extremely elevated slope efficiencies, close to the quantum limit, while demonstrating excellent beam quality.

    Como referenciar este item
    Icon

  • IPEN-DOC 30048

    SILVA, FLAVIA R.O. ; PASCOAL, DIEGO R.C. ; BERECZKI, ALLAN ; SIPERT, CARLA R.; BRAGA, ROBERTO R.; BELLINI, MARIA H. ; SILVA, LUIS F.T. ; FREITAS, ANDERSON Z. ; WETTER, NIKLAUS U. . Micro-Raman spectroscopy identification of hydroxyapatite in dental pulp stem cells. In: CONFERENCE ON LASERS AND ELECTRO-OPTICS: APPLICATIONS AND TECHNOLOGY, May 7-12, 2023, San Jose, CA, USA. Proceedings... Washington, DC, USA: Optica Publishing Group, 2023. DOI: 10.1364/CLEO_AT.2023.AM4Q.6

    Abstract: Cell differentiation using calcium phosphate nanoparticles was studied. The hydroxyapatite was internalized in human dental pulp stem cells and characterized by Raman spectroscopy. Raman spectra showed the hydroxyapatite distribution in nanoparticles nodules in the cells.

    Como referenciar este item
    Icon

  • IPEN-DOC 30047

    BERECZKI, ALLAN ; DIPOLD, JESSICA ; FREITAS, ANDERSON Z. ; WETTER, NIKLAUS . Direct nanoplastics detection below the diffraction limit using micro Raman. In: CONFERENCE ON LASERS AND ELECTRO-OPTICS: APPLICATIONS AND TECHNOLOGY, May 7-12, 2023, San Jose, CA, USA. Proceedings... Washington, DC, USA: Optica Publishing Group, 2023. DOI: 10.1364/CLEO_AT.2023.ATh3I.2

    Abstract: Raman spectra of polystyrene nanoparticles of 50 nm diameter were directly measured using micro-Raman spectroscopy. Data analysis demonstrated that particles as small as 20 nm could be directly measured with this simple and robust technique.

    Como referenciar este item
    Icon

  • IPEN-DOC 30045

    PIERETTI, E.F. ; CORREA, O.V. ; NEVES, M.D.M. ; OLIVEIRA, M.C.L.; ANTUNES, R.A.. Avaliação eletroquímica de alumina anódica nanoporosa aplicada a revestimentos biomédicos. In: CONGRESSO BRASILEIRO DE QUÍMICA, 62., 31 de outubro - 3 de novembro, 2023, Natal, RN. Anais... Rio de Janeiro, RJ: Associação Brasileira de Química - ABQ, 2023.

    Abstract: Óxido de alumínio anódico tem atraído interesse devido ao arranjo regular denanoporos, grande área de superfície específica, boa estabilidade térmica,ausência de toxicidade e biocompatibilidade. As estruturas OAA têm sidoaplicadas em filtros, biossenssores, sensores de oxigênio, catálise efotocatálise. O arranjo geométrico dos nanoporos torna possível utilizar aalumina como molde para a síntese de várias nanoestruturas, como nanoporos,nanotubos, nanobastões e nanofios que apresentam muitas vantagens em áreas deaplicação avançadas devido a suas propriedades químicas, físicas, mecânicas eópticas únicas. Dentre os materiais de aplicação biomédica destacam-se algumasligas de alumínio, pois apresentam resistência mecânica satisfatória,resistência à corrosão e baixo custo.

    Como referenciar este item
    Icon

  • IPEN-DOC 30044

    PIERETTI, E.F. ; CORREA, O.V. ; SILVA, L.C.E. da ; PILLIS, M.F. ; RIBEIRO, M.S. ; ROSSI, W. de ; NEVES, M.D.M. . Avaliação eletroquímica da liga Ti6Al4V produzida por manufatura aditiva. In: CONGRESSO BRASILEIRO DE QUÍMICA, 62., 31 de outubro - 3 de novembro, 2023, Natal, RN. Anais... Rio de Janeiro, RJ: Associação Brasileira de Química - ABQ, 2023.

    Abstract: O aprimoramento de propriedades de superfície é uma exigência para osbiomateriais. O objetivo deste trabalho foi investigar a resistência à corrosãode amostras da liga Ti6Al4V produzidas por manufatura aditiva, em solução deRinger, que simula os fluidos corpóreos. As amostras foram produzidas alterando-se alguns parâmetros do processo. A resistência à corrosão foi avaliadautilizando-se métodos eletroquímicos como: monitoramento de potencial decircuito aberto, medições de espectroscopia de impedância eletroquímica epolarização cíclica e análises de superfície por MEV. Algumas amostras forammais susceptíveis à corrosão, pois a alternância de parâmetros do processo defabricação produz superfícies distintas com acabamento superficialdiversificado, resultando em comportamentos diversos.

    Como referenciar este item
    Icon

  • IPEN-DOC 30043

    BAFFA, MATHEUS de F.O.; BACHMANN, LUCIANO; ZEZELL, DENISE M. ; PEREIRA, THIAGO M.; DESERNO, THOMAS M.; FELIPE, JOAQUIM C.. Advancing thyroid pathologies detection with recurrent neural networks and micro-FTIR hyperspectral imaging. In: ALMEIDA, JOAO R. (Ed.); SPILIOPOULOU, MYRA (Ed.); ANDRADES, JOSE A.B. (Ed.); PLACIDI, GIUSEPPE (Ed.); GONZALEZ, ALEJANDRO R. (Ed.); SICILIA, ROSA (Ed.); KANE, BRIDGET (Ed.) INTERNATIONAL SYMPOSIUM ON COMPUTER-BASED MEDICAL SYSTEMS, 36th, June 22-24, 2023, L’Aquila, Italy. Proceedings... Piscataway, NJ, USA: IEEE, 2023. p. 611-615. DOI: 10.1109/CBMS58004.2023.00288

    Abstract: Thyroid disorders are a complex group of diseases that require an accurate diagnosis for effective treatment. Fine-needle aspiration biopsies can assist in detecting many thyroid diseases. These materials can be analyzed visually using traditional computer vision methods, despite the limitations of complex samples. To address this problem, we propose a novel approach that uses hyperspectral imaging (HSI) to analyze thyroid biological samples. HSI measures the absorbance of infrared light by biological samples using a micro Fourier transform infrared spectroscopy (micro-FTIR) and converts this data into hyperspectral images. In this study, we used HSI to train and validate a recurrent neural network to classify thyroid samples as healthy, cancerous, or goiter. Our experiments, based on the k-fold cross-validation, achieved an overall accuracy of 96.88%, a sensitivity of 96.87%, and a specificity of 98.45%. These results demonstrate the potential of hyperspectral imaging as a tool to assist pathologists in the diagnosis of thyroid disease.

    Como referenciar este item
    Icon

  • IPEN-DOC 30002

    MAZZILLI, BARBARA . Revalorization of residues in the scope of the circular economy: case study from the titanium dioxide industry. In: INTERNATIONAL SYMPOSIUM ON NATURALLY OCCURRING RADIOACTIVE MATERIAL, 10th, May 9-13, 2022, Utrecht, Netherlands. Apresentação... 2022.

    Como referenciar este item
    Icon

  • IPEN-DOC 30001

    BORGES, FLAVIA L.S.; MAZZILLI, BARBARA P. ; SANTOS, NEYLIANE F.G. dos; MATTOS, UBIRAJARA A. de O.. NORM inventory in Brazil: case study of the production of Nb and Sn. In: INTERNATIONAL SYMPOSIUM ON NATURALLY OCCURRING RADIOACTIVE MATERIAL, 10th, May 9-13, 2022, Utrecht, Netherlands. Apresentação... 2022.

    Como referenciar este item
    Icon

  • IPEN-DOC 29781

    LEVY, D. ; LEVY, P.J.; VILLAVICENCIO, A.L.C.H. . La interdisciplinariedad en la educación básica: libro didáctico para la enseñanza de las ciencias nucleares. In: SIMPOSIO INTERNACIONAL SOBRE EDUCACIÓN, CAPACITACIÓN, DIFUSIÓN Y GESTIÓN DEL CONOCIMIENTO NUCLEAR, 3rd, July 26-29, 2022, Santiago, Chile. Proceedings... 2022.

    Abstract: La Base Nacional Común Curricular (BNCC) es un documento de carácter normativo que define el conjunto de aprendizajes esenciales, competencias y habilidades de la escolaridad básica para todas las escuelas brasileñas. El documento que define las etapas de la educación infantil y enseñanza fundamental fue homologado en 2017, y en 2018 se aprobaron las etapas para la Enseñanza Secundaria. La BNCC contempla cuestiones relacionadas con las ciencias nucleares, buscando el desarrollo de habilidades y competencias para una comprensión justa sobre reacciones nucleares y sus aplicaciones. Sin embargo, los propios profesores no fueron preparados para discutir el tema con profundidad y, generalmente, el tema se aborda de forma superficial a fin de cumplir el contenido mínimo requerido. El presente trabajo presenta el desarrollo de una propuesta pedagógica interdisciplinaria pasible de ser incorporada en la Enseñanza Básica, de forma transversal y integradora, desmitificando la irradiación de alimentos y la generación de energía nuclear, estes controvertidos temas que afectan a la vida humana en escala local, regional y global. El material consiste en una colección de libros ilustrados para los estudiantes, libros para docentes y un manual con actividades que se pueden desarrollar en diferentes disciplinas: portugués, matemáticas, ciencias, inglés, historia y geografía. Los libros son elaborados con alto rigor científico y articulan la tecnología nuclear con temas de interés a la sociedad en los más diversos aspectos, como el social, sanitario y económico, entre otros. El objetivo de esta propuesta pedagógica, a ser sometida al Ministerio de Educación de Brasil, es auxiliar a profesores y estudiantes en la construcción colectiva del conocimiento, incentivando la investigación de las ciencias nucleares, imprimiendo nuevos sentidos a la vida cotidiana, ampliando los horizontes de elecciones personales y profesionales de las nuevas generaciones.

    Como referenciar este item
    Icon

  • IPEN-DOC 29780

    LEVY, D.; LEVY, P.J.; PAZ, A.L. . El uso didáctico de las tecnologías digitales para la divulgación científica de la tecnología nuclear. In: SIMPOSIO INTERNACIONAL SOBRE EDUCACIÓN, CAPACITACIÓN, DIFUSIÓN Y GESTIÓN DEL CONOCIMIENTO NUCLEAR, 3rd, July 26-29, 2022, Santiago, Chile. Proceedings... 2022.

    Abstract: El presente trabajo describe la evolución de una plataforma educativa para la divulgación de las ciencias nucleares, una temática que sigue siendo un misterio para gran parte de la sociedad brasileña. El objetivo de esta propuesta es la diseminación de la información científica de forma gratuita, inclusiva y amplia, posibilitando el acceso de la información a niños y profesores, incluyendo los públicos geográficamente distantes o socialmente desvalidos. Para la orientación y el desarrollo tecnológico del proyecto los investigadores acompañan anualmente las publicaciones oficiales sobre tendencias de acceso a las Tecnologías de la Información y Comunicación (TICs), con indicadores sobre posibilidades y limitaciones en cuanto al acceso a la Internet en domicilios y escuelas en Brasil y Latinoamérica. Paralelamente, se desarrollan los contenidos didácticos de cuño científico sobre las diversas aplicaciones de la tecnología nuclear: uso médico, aplicaciones industriales, generación de energía, preservación del patrimonio histórico e irradiación de alimentos, entre otros. Esta acción educativa va al encuentro de los informes oficiales del gobierno brasileño sobre acciones anheladas por las políticas públicas acerca de los medios digitales para potenciar la diseminación de la información. Por ser un material inédito en Brasil y en el mundo, de interés para otros países de la Región, la plataforma inicialmente disponible en portugués fue enteramente traducida al español. Esta es una acción educativa en consonancia con las más modernas tendencias para la divulgación científica, en un mundo de rápidos cambios tecnológicos donde se hace necesaria la adopción de nuevos enfoques pedagógicos y un mayor uso de las TICs en el proceso de enseñanza y aprendizaje. Especialmente en un mundo post pandemia, donde educadores y estudiantes experimentaron el aislamiento social y reclamaron soluciones virtuales de calidad para mejorar el aprendizaje académico, este proyecto educativo sigue contribuyendo a la construcción del conocimiento de niños, adolescentes y docentes.

    Como referenciar este item
    Icon

  • IPEN-DOC 29779

    LEVY, D. ; SORDI, G.M.A.A. ; RODRIGUES, D.L. ; CARNEIRO, J.C.G.G. . Digital technology tools to improve professional development in brazilian radioactive facilities. In: SIMPOSIO INTERNACIONAL SOBRE EDUCACIÓN, CAPACITACIÓN, DIFUSIÓN Y GESTIÓN DEL CONOCIMIENTO NUCLEAR, 3rd, July 26-29, 2022, Santiago, Chile. Proceedings... 2022.

    Abstract: This article focuses on digital technology tools to improve workers' skills in Brazilian radioactive facilities. Uniprorad is a web-based system designed to improve the global communication about radiological protection in this very large country, where it is a strong challenge to ensure high quality professional information to as many people as possible. This article presents the authors' experience in the communication of radiological protection and the evolution of this web-based system. Created in 2013, the system Uniprorad is constantly updated to offer a complete web-based repository in Portuguese for research, consultation and information. The content presents discussions related to optimization (since 2013), monitoring (developed in 2015), potential exposure (since 2017) and communication on occupational risk agents in the workplace (started in 2019). Regarding risk agents in the workplace, the content has been developed to teach the identification and evaluation of the various risk agents (physical, chemical biological and ergonomic) and their association to ionizing radiation. In addition, to concepts, definitions and theory, the Project Uniprorad counts on interactive exercises, about radiological protection taking into account.the best practices for radioactive facilities in order to meet both national standards and international recommendations. The aim of this paper is to provide a critical review of the evolutions of this web-based system to outreach this target audience, and to assist other experts on planning and implementing effective strategies to communicate radiological protection. The results of this experience support the idea that in a rapid-changing world it is a must to invest in constant innovations to improve professional development.

    Como referenciar este item
    Icon

  • IPEN-DOC 29758

    GUERRA, D. ; MARTINS, T.T.M. ; RODRIGUES JUNIOR, O. ; SOUZA, C.D. de . RDC 330 in practice: analysis of the challenges of implementing normative instruction 97 in the private magnetic resonance services of the city of Fortaleza-CE. 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: Medical radiology has social and academic relevance because it is a specialty that uses different types of radiation for diagnostic and therapeutic purposes. It requires a multidisciplinary team that is attentive to the changing guidelines imposed by the government. The rules are presented and enforced by the National Health Surveillance Agency (ANVISA) and the State and Municipal Health Surveillance (VISA). Currently, the ANVISA standard that regulates radiodiagnostic clinics is Collegiate Board Resolution 330 (RDC) and Normative Instructions (INs) 90, 91, 92, 93, 94, 95, 96 and 97, which dictate the rules of operation of the clinic in general and each equipment in particular. In this work, we evaluated the implementation of this new resolution, through a qualitative study, with the following procedures: interviews, analysis, comparison of results, and direct observation in 05 magnetic resonance centers of the private hospital network of the metropolitan region of Fortaleza. A question that the work intends to try to answer: Given the data collected, what will be the possible initial, medium and long-term impacts of the implementation of these Ins.

    Palavras-Chave: diagnosis; documentation; equipment; health services; nmr imaging; occupational exposure; radiation protection; recommendations; regulations; safety

    Como referenciar este item
    Icon

  • IPEN-DOC 29756

    MARINHO, T.C. ; CARVALHO, E.F.U. ; FERNANDES, V.C.; SANTIAGO, E.I. . Emprego de rotas eletroquímicas na separação seletiva e de alto rendimento de iodo-131 para aplicação como radiofármaco. In: CONGRESSO LATINOAMERICANO DE QUÍMICA, 35th; CONGRESSO BRASILEIRO DE QUÍMICA, 61th, November 14-18, 2022, Rio de Janeiro, Brasil. Proceedings... Rio de Janeiro: Associação Brasileira de Química - ABQ, 2022.

    Abstract: O iodo-131 é um radiofármaco emissor de partícula β- , utilizado no tratamento do câncer de tireóide. Os processos de produção do iodo-131 via fissão de urânio-235 ou irradiação de alvos de telúrio, resultam em soluções compostas por diferentes metais, como molibdênio (Mo), telúrio (Te) e rutênio (Ru). O objetivo deste trabalho foi empregar rotas eletroquímicas baseadas na mudança de temperatura e aplicação de potencial para separação de iodo. Inicialmente Mo, Te e Ru foram analisados quanto à sua interferência no processo de separação e o iodo quanto ao potencial em que a reação se processa com maior velocidade. Em seguida, o iodo foi separado, capturado e testado qualitativamente. Os testes indicaram boa captura em 25° C e 40 °C e pouca captura em 60 °C.

    Como referenciar este item
    Icon

  • IPEN-DOC 29755

    BEZERRA, ANDERSON M.; RODRIGUES, DANIEL S.; ANTONIO, PATRICIA L. ; JUNOT, DANILO O.; CALDAS, LINDA V.E. ; SOUZA, DIVANIZIA N.. CaSO4 dopado com manganês e térbio (CaSO4:Mn,Tb): um novo fósforo para dosimetria de radiação. In: CONGRESSO BRASILEIRO DE FISICA MEDICA, 26th; CONGRESSO LATINO-AMERICANO DE FISICA MEDICA, 9th, June 8-11, 2022, Fortaleza, CE. Proceedings... São Paulo, SP, 2022.

    Abstract: Cristais de CaSO4:Mn,Tb foram sintetizados pela rota de evaporação lenta, com dopagens de 0,1 mol% de Mn e Tb. As amostras foram preparadas na forma de pastilhas com adição de Teflon. A estrutura cristalina e as propriedades ópticas dos cristais foram avaliadas por difração de raios X, espectroscopia no infravermelho com transformada de Fourier e fotoluminescência. As propriedades dosimétricas desses cristais foram investigadas pela técnica de termoluminescência (TL) e luminescência opticamente estimulada (OSL). Os cristais irradiados com doses entre 200 mGy e 150 Gy apresentam curva de emissão TL com dois picos em 205°C e 325°C e curva de decaimento de OSL com boa reprodutibilidade e linearidade à dose dos sinais luminescentes. Dois centros de armadilhamento em 0,77 e 1,02 eV foram revelados. A dependência da taxa de aquecimento também foi avaliada. A menor dose detectável foi investigada pelas técnicas TL e OSL, sendo essa da ordem de mGy em ambas as técnicas. Observou-se também que a dopagem e codopagem com Mn e Tb contribuíram para a redução do fading em comparação com resultados sobre CaSO4:Mn e CaSO4:Tb de outros trabalhos.

    Como referenciar este item
    Icon

  • IPEN-DOC 29753

    CIONGOLI, GIOVANA ; BIATY, FLAVIA P. ; PALADINO, PATRICIA A.; SABUNDJIAN, GAIANE. O uso de veículos subaquáticos operados remotamente nas industriais de energia hidrelétrica e nuclear. In: ENCONTRO DE INICIAÇÃO CIENTÍFICA E PÓS-GRADUAÇÃO DO CAMPUS SÃO PAULO, 7, 19-22 de setembro, 2022, São Paulo, SP. Anais... São Paulo, SP: IFSP - Campus São Paulo, 2022. p. 1-4.

    Abstract: Os veículos subaquáticos operados remotamente, conhecidos como Remotely Operated Vehicles (ROV’s), possuem eficiência comprovada em diversas aplicações. Sua utilização em ambientes insalubres e confinados, tais como usinas hidrelétricas e nucleares, permite maior segurança e eficiência dos trabalhos subaquáticos. Dessa forma, este trabalho buscou apresentar uma perspectiva mundial sobre o uso dos ROV’s na área das indústrias hidrelétrica e nuclear, analisando sua aplicabilidade no âmbito nacional, por meio de uma revisão bibliográfica. Concluiu-se que a aplicação dos ROV’s é pertinente e necessária, considerando a matriz elétrica brasileira. Entretanto, observou-se que essa tecnologia é ainda pouco difundida, de forma que a pesquisa e publicação de trabalhos sobre o tema poderão gerar mais confiabilidade no método apresentado.

    Como referenciar este item
    Icon

  • IPEN-DOC 29752

    OLIVEIRA, JOAO P.A.; NOGUEIRA, JANINE ; NISHIDA, PAULA; SOUZA, THAIS C.S. de. A importância do DSM na arqueologia: os tijolos da Casa do Grito. In: ENCONTRO DE INICIAÇÃO CIENTÍFICA E PÓS-GRADUAÇÃO DO CAMPUS SÃO PAULO, 7., 19-22 de setembro, 2022, São Paulo, SP. Anais... São Paulo, SP: IFSP - Campus São Paulo, 2022. p. 1-5.

    Abstract: Este artigo apresenta a importância da tecnologia e usos de aplicativos utilizados na arqueologia para gerar imagens e orthofotos como documento e arquivo digital. Esse artigo tem como finalidade apresentar a importância do uso da ferramenta DSM na preservação de artefatos arqueológicos. O Dense Stereo Matching (DSM), é o programa que utiliza o processamento digital de imagens fotográficas. Essa nova tecnologia foi desenvolvida nos últimos anos a partir do avanço da fotogrametria digital, e da visão computacional. No intuito de aprimorar as ferramentas para a geração de modelos geométricos a partir de fotografias. O importante método de preservação da história como ferramenta de documentação arqueológica. Processo de levantamento DSM, consiste no planejamento, aquisição de dados, processamento e pós-processamento. Como resultado desse processo de catalogação dos tijolos através das imagens que foram geradas pelo programa 3D. Neste estudo demonstra as imagens e o levantamento dos tijolos da Casa do Grito, em parceria com o Centro de Arqueologia de São Paulo (CASP) - DPH|SMC|PMSP e o IFSP.

    Como referenciar este item
    Icon

  • IPEN-DOC 29729

    GARCIA, PRISCILA ; ORTIZ, NILCE . Utilização da fotodecomposição solar para remoção de BTEX em água subterrânea contaminada pela atividade de posto de gasolina. In: CONGRESSO DA ÁGUA, 16, 21-24 de março, 2023, Lisboa, Portugal. Proceedings... 2023. p. 96-98.

    Como referenciar este item
    Icon

  • IPEN-DOC 29698

    LARA, J.A.C. ; COUTO, C.P. ; NIZES, A.D.C.; ABBADE, L. ; GONSALEZ, B. ; COLOSIO, M.A.; ROSSI, J.L. . Effect of resistance spot welding parameters on the residual stress of automotive ultra high strength steel. In: SENAFOR, 37th; INTERNATIONAL FORGING CONFERENCE, 21th; NATIONAL SHEET METAL FORMING CONFERENCE, 20th; INTERNATIONAL SHEET METAL FORMING CONFERENCE, 7th; BRDDRG CONGRESS, 4th; INTERNATIONAL CONFERENCE ON MATERIALS AND PROCESSES FOR RENEWABLE ENERGIES – BRAZIL/RS, 7th; INTERNATIONAL CONFERENCE ON SURFACE ENGINEERING IN MATERIAL FORMING, October 04-06, 2017, Porto Alegre, RS. Proceedings... 2017.

    Abstract: Studies on residual stress effect in resistance spot welding (RSW) have not been widely explored for the new ultra-high strength steels (UHSS), such as, press-hardened steel (PHS) used for the automotive industry application. The number of PHS parts has been widely increasing in the vehicle structure, due to its ultra-high tensile strength achieved after the hot stamping process, which can reach 1500 MPa. This outstanding steel properties is function of steel grade and is a guaranty for lightweight and safety. Weldability is one of major issues to allow the large product application in the automotive industry however, the numbers of papers and works with focus on PHS weldability is still small. The residual stresses in spot welded joints play an important role in affecting the durability of the joint. It is well known that the residual stresses may reduce the mechanical properties of the welding joint and contribute to hydrogen embrittlement effect. This paper has undertaken an experimental survey of residual stress on 22MnB5 - PHS steel, using X-ray diffraction technique, before any heat treatment, i.e., without hot stamping, with variation of the main welding parameters. In general, it was found that the residual stress results showed a great influence of the resistance spot welding parameters. The residual stress measures showed levels up to 300 MPa in PHS material, which can impair the material usage.

    Como referenciar este item
    Icon

  • IPEN-DOC 29672

    EDUARDO, FERNANDA P.; MEHNERT, DOLORES U.; MONEZI, TELMA A.; ZEZELL, DENISE M. ; SCHUBERT, MARK M.; EDUARDO, CARLOS P.; MARQUES, MARCIA M.. In vitro effect of phototherapy with low intensity laser on HSV-1 and epithelial cells. In: HAMBLIN, MICHAEL R. (Ed.); WAYNANT, RONALD W. (Ed.); ANDERS, JUANITA (Ed.) SPIE BIOS, January 20-25, 2007, San Jose, CA, USA. Proceedings... Bellingham, WA, USA: SPIE, 2007. p. 642805-1 - 642805-10. (Proceedings SPIE 6428, Mechanisms for Low-Light Therapy II, 642805). DOI: 10.1117/12.700682

    Abstract: The effects of phototherapy on herpes lesions have been clinically demonstrated by either preventing the lesion formation or speeding their repair. The aim of this in vitro study was analyze the effect of phototherapy on epithelial cells and HSV-1 in culture. Cultures of HSV-1 and epithelial cells (Vero cell line) were used. The irradiations were done using a GaAlAs laser (660 e 780 nm, 4.0 mm2). One, two and three irradiations with 6 h-intervals were done. The experimental groups were: Control: non-irradiated; 660 nm and 3 J/cm2 (2.8 sec); 660 nm and 5 J/cm2 (3.8 sec); 780 nm and 3 J/cm2 (1.9 sec), and 780 nm and 5 J/cm2 (2.5 sec). The HSV-1 cytopatic effect and the cell viability of irradiated cultures and controls were analyzed in four different conditions: irradiation of non-infected epithelial cells; epithelial cells irradiated prior infection; virus irradiated prior infection; irradiation of HSV infected cells. The mitochondrial activity and cytopathic effects were assessed. The number of irradiations influenced the cell growth positively and proportionally, except for the 660 nm/ 3 J/cm2 group. Any variation in cytopathic effects was observed amongst the experimental groups. The viability of infected cells prior irradiation was significantly higher than that of non-irradiated cultures when 2 irradiations were done. Under the experimental conditions of this study we concluded that phototherapy is capable of enhancing epithelial cell growth and prolonging cell viability of HSV-1 infected cells. Positive benefits of phototherapy could be resultant from prolongation of infected cells viability, corroborating with host defenses.

    Como referenciar este item
    Icon

  • IPEN-DOC 29670

    ARAUJO, R.E. de; MELO, L.S.A. de; FREITAS, A.Z. ; ZEZELL, D. ; VIEIRA JUNIOR, N.D. ; GOMES, A.S.L.. Applying optical coherence tomography in dental restoration. In: SBMO/IEEE MTT-S INTERNATIONAL MICROWAVE AND OPTOELECTRONIC CONFERENCE, July 25-28, 2005, Brasília, DF. Proceedings... Piscataway, NJ, USA: IEEE, 2005. p. 411-414. DOI: 10.1109/IMOC.2005.1580032

    Abstract: Optical coherence tomography was use to perform an evaluation of molar dental restorations. Imaging resolution of 10 /spl mu/m is achieved and dental cavities small as 50 /spl mu/m are measured. OCT images were compared with X-ray and optical microscopy pictures.

    Como referenciar este item
    Icon

  • IPEN-DOC 29667

    CAMARGO, F. ; ZANON-WILLETTE, T.; BADR, T.; WETTER, N.U. ; ZONDY, J.-J.. 620 mW single-frequency Nd:YVO4/BiB3O6 red laser. In: CONFERENCE ON LASERS AND ELECTRO-OPTICS; INTERNATIONAL QUANTUM ELECTRONICS CONFERENCE, June 2-4, 2009, Baltimore, MD, USA. Proceedings... Washington, DC, USA: Optical Society of America, 2009.

    Abstract: Using a type-I critically phase-matched bismuth borate crystal, a record 620 mW single-frequency red laser at 671 nm is achieved from intra-cavity SHG of a pi-polarized single-end pumped Nd:YVO 4 ring laser oscillating on the lambda~1342 nm transition.

    Como referenciar este item
    Icon

  • IPEN-DOC 29666

    CAMARGO, F. ; ZANON-WILLETTE, T.; SARROUF, R.; BADR, T.; WETTER, N.U. ; ZONDY, J.-J.. 1.3 Watt Single-Frequency Nd:YLF/ppKTP red laser. In: CONFERENCE ON LASERS AND ELECTRO-OPTICS; INTERNATIONAL QUANTUM ELECTRONICS CONFERENCE, June 2-4, 2009, Baltimore, MD, USA. Proceedings... Washington, DC, USA: Optical Society of America, 2009. DOI: 10.1364/CLEO.2009.CThZ7

    Abstract: Using a temperature-tuned ppKTP crystal, a record 1.3 W single-frequency red laser at 661 nm is achieved from intra-cavity second-harmonic generation of a Nd:YLiF 4 ring laser oscillating on the pi-polarized transition (lambda~1321 nm).

    Como referenciar este item
    Icon

  • IPEN-DOC 29664

    MATOS, P.S.F. de ; WETTER, N.U. . Optimization of a 2.3 µm Yb:Tm:YLF laser, pumped at 685 nm and 960 nm simultaneously. In: ENCONTRO NACIONAL DE FISICA DA MATERIA CONDENSADA, 29., 9-13 de maio, 2006, São Lourenço, MG. Anais... São Paulo, SP: Sociedade Brasileira de Física, 2006.

    Abstract: For the first time, a unique pumping scheme for the thulium 2.3 micrometer transition is proposed that is capable of enhancing the output power by almost a factor three when compared to the traditional pumping scheme at 960 nm. The best relation between 685 nm pump power and 960 nm pump power is shown. The achieved output power of 620 mW is the highest reported so far.

    Como referenciar este item
    Icon

  • IPEN-DOC 29663

    WETTER, NIKLAUS U. . Bandwidth narrowing and dual wavelength emission of a 20 W laser diode array. In: ENCONTRO NACIONAL DE FISICA DA MATERIA CONDENSADA, 29., 9-13 de maio, 2006, São Lourenço, MG. Anais... São Paulo, SP: Sociedade Brasileira de Física, 2006.

    Abstract: We report on the performance of a commercial, non-AR coated diode laser bar, consisting of 20 emitters, which uses an external cavity to achieve 16 W of bandwidth-narrowed output and 2.9 W of dual wavelength emission. These are the highest output powers reported so far for this type of cavity and diode laser array.

    Como referenciar este item
    Icon

  • IPEN-DOC 29662

    FRACASSO, PAULO T.; NADER, GILDER; JABARDO, PAULO J.S.; PEREIRA, MARCOS T.; CALY, JOSE P.; BRUNA, WAGNER C.; MARTINS, FLAVIUS P.R.; FERRARA, EDUARDO; MURAMATSU, MIKIYA; WETTER, NIKLAUS U. . Development of a PIV system using a laser-diode. In: INTERNATIONAL CONGRESS OF MECHANICAL ENGINEERING, 18th, November 6-11, 2005, Ouro Preto, MG. Proceedings... Rio de Janeiro, RJ: Associação Brasileira de Engenharia e Ciências Mecânicas - ABCM, 2005.

    Abstract: A low cost PIV (Particle Image Velocimetry) was developed for characterization, visualization and quantification of a flow test section. Optical devices are common nowadays in metrology, in fluid-flow measurement and studies of flow around structural models or industrial facilities in wind tunnels. The advantages of the optic devices are high resolution, precision, fast response time and, most important, it is not intrusive. The PIV system developed is composed by a quasi-continuous laser-diode with nominal power up to 100 W, monochromatic at 800 nm wave length. An orthogonal lens set defines the width and thickness of the light screen in the test section. Image acquisition is made by a CCD camera. Acquisition and processing image software was developed in C++ and Matlab. The flow field velocities are determined by processing successive images using cross correlation. Analysis of fluid flow around 1 and 2 cylinders, in parallel, were conducted. The tests were conducted in water seeded with micro-spheres with 30 μm mean diameter. The analysis were conducted with velocities of the order of 0.15 m/s, the optical window dimensions was about 100 mm x 150 mm. The results show that the PIV prototype is working even though further development is necessary.

    Como referenciar este item
    Icon

  • 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 / XXXXX. 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.

    Palavras-Chave: heavy metals; adsorption; microspheres; aluminium oxides

    Como referenciar este item
    Icon

  • 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.

    Como referenciar este item
    Icon

  • 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.

    Palavras-Chave: urban areas; water supply; climatic change; ecosystems; nuclear energy

    Como referenciar este item
    Icon

  • 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.

    Como referenciar este item
    Icon

  • 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.

    Como referenciar este item
    Icon

  • 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.

    Palavras-Chave: calcium sulfates; comparative evaluations; decay; diagrams; evaporation; glow curve; heating rate; irradiation; manganese ions; optical properties; phosphors; photoluminescence; radiation doses; signals; thermal gravimetric analysis; thermoluminescence

    Como referenciar este item
    Icon

  • 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.

    Como referenciar este item
    Icon

  • 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).

    Como referenciar este item
    Icon

  • 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.

    Como referenciar este item
    Icon

  • 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.

    Como referenciar este item
    Icon

  • 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.

    Como referenciar este item
    Icon

  • 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.

    Como referenciar este item
    Icon

  • 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.

    Como referenciar este item
    Icon

  • 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.

    Como referenciar este item
    Icon

  • 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.

    Como referenciar este item
    Icon

  • 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.

    Como referenciar este item
    Icon

  • 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.

    Como referenciar este item
    Icon

  • 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.

    Como referenciar este item
    Icon

  • 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.

    Como referenciar este item
    Icon

  • 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.

    Como referenciar este item
    Icon

  • 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.

    Palavras-Chave: lasers; pulses; germanates; waveguides; optical equipment; silver; nanoparticles

    Como referenciar este item
    Icon

  • 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.

    Como referenciar este item
    Icon

  • 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.

    Como referenciar este item
    Icon

  • 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.

    Como referenciar este item
    Icon

  • 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.

    Como referenciar este item
    Icon

  • 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.

    Como referenciar este item
    Icon

  • 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.

    Como referenciar este item
    Icon

  • 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.

    Como referenciar este item
    Icon

  • 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.

    Como referenciar este item
    Icon

  • 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.

    Como referenciar este item
    Icon

  • 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.

    Como referenciar este item
    Icon

  • 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.

    Como referenciar este item
    Icon

  • 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.

    Como referenciar este item
    Icon

  • 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.

    Como referenciar este item
    Icon

  • 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.%.

    Como referenciar este item
    Icon

  • 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.

    Como referenciar este item
    Icon

  • 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.

    Palavras-Chave: chromium oxides; uranium dioxide; fission; fission product release; grain size

    Como referenciar este item
    Icon

  • 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.

    Palavras-Chave: microstructure; electric conductivity; additives; doped materials; lanthanum compounds; gallium compounds

    Como referenciar este item
    Icon

  • 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.

    Palavras-Chave: lanthanum oxides; strontium oxides; gallium oxides; chemical reactions; synthesis; thermal analysis

    Como referenciar este item
    Icon

  • 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.

    Palavras-Chave: sintering; density; aluminium oxides; ceramics; neodymium; titanates

    Como referenciar este item
    Icon

  • 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.

    Como referenciar este item
    Icon

  • 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.

    Como referenciar este item
    Icon

  • 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.

    Palavras-Chave: stainless steels; surface treatments; implants; lasers; biological repair

    Como referenciar este item
    Icon

  • 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.

    Palavras-Chave: dosimetry; phantoms; thermoluminescent dosemeters; 3d printing; photon beams; skull; bone tissues

    Como referenciar este item
    Icon

  • 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

    Palavras-Chave: texture; ceramics; machining; roughness; cutting machines

    Como referenciar este item
    Icon

  • 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.

    Palavras-Chave: fluid-structure interactions; reactors; hydraulics; water hammer

    Como referenciar este item
    Icon

  • 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.

    Palavras-Chave: reflectivity; bragg reflection; fiber optics; finite difference method

    Como referenciar este item
    Icon

  • 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.

    Palavras-Chave: doped materials; ytterbium; optical fibers; equations; runge-kutta method

    Como referenciar este item
    Icon

  • 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.

    Palavras-Chave: optical fibers; coupling; power transmission; pumping; transmission

    Como referenciar este item
    Icon

  • 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.

    Palavras-Chave: neoplasms; mammary glands; tumor cells; machine learning; artificial intelligence; accuracy; identification systems

    Como referenciar este item
    Icon

  • 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.

    Palavras-Chave: neural networks; dentistry; enamels; demineralization; learning

    Como referenciar este item
    Icon

  • 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.

    Palavras-Chave: laser beam machining; lasers; ablation; nozzles; supersonic flow; targets; wakefield accelerators

    Como referenciar este item
    Icon

  • 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.

    Palavras-Chave: lasers; semiconductor diodes; simulation; computer codes

    Como referenciar este item
    Icon

  • 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.

    Palavras-Chave: optical equipment; sensors; nanotechnology; plasmons; silver

    Como referenciar este item
    Icon

  • 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.

    Palavras-Chave: lasers; refractive index; optical properties; wave equations; compressibility; calculation methods

    Como referenciar este item
    Icon

  • 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.

    Palavras-Chave: chemical vapor deposition; computer calculations; fluid mechanics; finite element method

    Como referenciar este item
    Icon

  • 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.

    Como referenciar este item
    Icon

  • 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.

    Palavras-Chave: hardening; steels; automotive industry; welded joints; shear properties; strains; resistance welding; spot welding

    Como referenciar este item
    Icon

View more

A pesquisa no RD utiliza os recursos de busca da maioria das bases de dados. No entanto algumas dicas podem auxiliar para obter um resultado mais pertinente.

✔ É possível efetuar a busca de um autor ou um termo em todo o RD, por meio do Buscar no Repositório , isto é, o termo solicitado será localizado em qualquer campo do RD. No entanto esse tipo de pesquisa não é recomendada a não ser que se deseje um resultado amplo e generalizado.

✔ A pesquisa apresentará melhor resultado selecionando um dos filtros disponíveis em Navegar

✔ Os filtros disponíveis em Navegar tais como: Coleções, Ano de publicação, Títulos, Assuntos, Autores, Revista, Tipo de publicação são autoexplicativos. O filtro, Autores IPEN apresenta uma relação com os autores vinculados ao IPEN; o ID Autor IPEN diz respeito ao número único de identificação de cada autor constante no RD e sob o qual estão agrupados todos os seus trabalhos independente das variáveis do seu nome; Tipo de acesso diz respeito à acessibilidade do documento, isto é , sujeito as leis de direitos autorais, ID RT apresenta a relação dos relatórios técnicos, restritos para consulta das comunidades indicadas.

A opção Busca avançada utiliza os conectores da lógica boleana, é o melhor recurso para combinar chaves de busca e obter documentos relevantes à sua pesquisa, utilize os filtros apresentados na caixa de seleção para refinar o resultado de busca. Pode-se adicionar vários filtros a uma mesma busca.

Exemplo:

Buscar os artigos apresentados em um evento internacional de 2015, sobre loss of coolant, do autor Maprelian.

Autor: Maprelian

Título: loss of coolant

Tipo de publicação: Texto completo de evento

Ano de publicação: 2015

✔ Para indexação dos documentos é utilizado o Thesaurus do INIS, especializado na área nuclear e utilizado em todos os países membros da International Atomic Energy Agency – IAEA , por esse motivo, utilize os termos de busca de assunto em inglês; isto não exclui a busca livre por palavras, apenas o resultado pode não ser tão relevante ou pertinente.

✔ 95% do RD apresenta o texto completo do documento com livre acesso, para aqueles que apresentam o significa que e o documento está sujeito as leis de direitos autorais, solicita-se nesses casos contatar a Biblioteca do IPEN, [email protected] .

✔ Ao efetuar a busca por um autor o RD apresentará uma relação de todos os trabalhos depositados no RD. No lado direito da tela são apresentados os coautores com o número de trabalhos produzidos em conjunto bem como os assuntos abordados e os respectivos anos de publicação agrupados.

✔ O RD disponibiliza um quadro estatístico de produtividade, onde é possível visualizar o número dos trabalhos agrupados por tipo de coleção, a medida que estão sendo depositados no RD.

✔ Na página inicial nas referências são sinalizados todos os autores IPEN, ao clicar nesse símbolo será aberta uma nova página correspondente à aquele autor – trata-se da página do pesquisador.

✔ Na página do pesquisador, é possível verificar, as variações do nome, a relação de todos os trabalhos com texto completo bem como um quadro resumo numérico; há links para o Currículo Lattes e o Google Acadêmico ( quando esse for informado).

ATENÇÃO!

ESTE TEXTO "AJUDA" ESTÁ SUJEITO A ATUALIZAÇÕES CONSTANTES, A MEDIDA QUE NOVAS FUNCIONALIDADES E RECURSOS DE BUSCA FOREM SENDO DESENVOLVIDOS PELAS EQUIPES DA BIBLIOTECA E DA INFORMÁTICA.

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.

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.

1. Portaria IPEN-CNEN/SP nº 387, que estabeleceu os princípios que nortearam a criação do RDI, clique aqui.


2. A experiência do Instituto de Pesquisas Energéticas e Nucleares (IPEN-CNEN/SP) na criação de um Repositório Digital Institucional – RDI, clique aqui.

O Repositório Digital do IPEN é um equipamento institucional de acesso aberto, criado com o objetivo de reunir, preservar, disponibilizar e conferir maior visibilidade à Produção Científica publicada pelo Instituto, desde sua criação em 1956.

Operando, inicialmente como uma base de dados referencial o Repositório foi disponibilizado na atual plataforma, em junho de 2015. No Repositório está disponível o acesso ao conteúdo digital de artigos de periódicos, eventos, nacionais e internacionais, livros, capítulos, dissertações, teses e relatórios técnicos.

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.