Reposiório IPEN: Recent submissions

  • IPEN-DOC 28420

    OLIVO-ARIAS, L.P.; ARAUJO, L.G. . Three-dimensional transient numerical simulation of the solid volume fraction of a fluidized bed: the role of three solution orders using a discretization scheme. Latin-American Journal of Physics Education, v. 15, n. 2, p. 2303-1 - 2303-10, 2021.

    Abstract: The FLUENT solver employed in the Computational Fluid Dynamics (CFD) has been extensively developed to extend its robustness and precision for a wide range of flow regimes. For that, the FLUENT solver has a numerical method in the pressure-based solver that has traditionally been used for incompressible and slightly compressible flows. The algorithm is based on the pressure that solves the equations in a segregated or decoupled mode. This algorithm has proven to be robust and versatile and has been used cooperatively with a wide range of physical models, including multiphase flows and conjugated heat transfer. However, there are applications in which the convergence rate of the segregated algorithm is not satisfactory, generally due to the need in these coupling scenarios between the continuity and momentum equations. The objective of this article is to validate the Eulerian model to determine the volumetric fractions of the solid phase fraction. For this, we used data from the literature and the PCSIMPLE algorithm (solver) at different orders of solution of the continuity, momentum, and turbulence equations. Also, we determined its efficiency in transient systems and how it would affect the results in the hydrodynamics of a three-phase fluidized bed reactor. The results were significant, thus representing the phenomenon of interaction between the liquid-solid and solid-gas phases.

    Palavras-Chave: hydrodynamic model; computerized simulation; computer calculations; dynamics; fluidized beds

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  • IPEN-DOC 28419

    OLIVO-ARIAS, L.P.; ARAUJO, L.G. . The influence of the initial gas distribution on the dynamics of a three-phase fluidized bed reactor: non-ideal gas condition. Latin-American Journal of Physics Education, v. 15, n. 1, p. 1312-1 - 1312-6, 2021.

    Abstract: The hydrodynamic evolution of a three-dimensional (3D) liquid-gas-solid fluidized bed reactor was studied using computational fluid dynamics (CFD) simulations, and the results were compared with previous experimental data. The gas-solid and liquid-solid interactions were calculated using the Euler-Euler model, incorporating the kinetic theory for the solid phase. The momentum exchange coefficients for the fluid-solid interactions were calculated using the Gidaspow drag model, and the fluid-fluid interactions by using the Schiller-Naumann model. The predicted gas volume fraction agreed to the Kumar model and showed better performance with the use of higher-order discretization. Furthermore, the Peng Robinson thermodynamic correlation was used to determine the properties of the materials under high severity conditions. The results showed a consistent distribution of the phases, it was quite uniform and there was a reasonable expansion of the bed when gas injection was established as an initial condition.

    Palavras-Chave: computer calculations; dynamics; hydrodynamics; fluidized beds

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  • IPEN-DOC 28418

    IMAMURA, MARTA; MIRISOLA, ALINE R.; RIBEIRO, FERNANDO de Q.; DE PRETTO, LUCAS R. ; ALFIERI, FABIO M.; DELGADO, VINICIUS R.; BATTISTELLA, LINAMARA R.. Rehabilitation of patients after COVID-19 recovery: an experience at the Physical and Rehabilitation Medicine Institute and Lucy Montoro Rehabilitation Institute. Clinics, v. 76, p. 1-9, 2021. DOI: 10.6061/clinics/2021/e2804

    Abstract: OBJECTIVES: As patients recovering from the novel coronavirus disease 2019 (COVID-19) present with physical, respiratory, cognitive, nutritional, and swallowing-related impairments and mental health complications, their rehabilitation needs are complex. This study aimed to describe the demographic, clinical, and functional status after the discharge of COVID-19 survivors who underwent intensive multidisciplinary inpatient rehabilitation at the Physical and Rehabilitation Medicine Institute of the University of Sao Paulo Medical School General Hospital and Lucy Montoro Rehabilitation Institute. We determined the most important factors related to the length of inpatient rehabilitation treatment and present the functional outcomes. METHODS: This was a retrospective study based on electronic medical records. In addition to the severity of COVID-19 and length of hospital stay for the management of COVID-19 and comorbidities, we collected sociodemographic data including age, sex, height, and weight. Functional assessments were performed using the Functional Independence Measure (FIM); Short Physical Performance Battery; Montreal Cognitive Assessment; Depression, Anxiety and Stress Scale; Revised Impact of Events Scale; bioelectrical impedance; Functional Oral Intake Scale; oropharyngeal dysphagia classification; and nutritional assessment. RESULTS: There was a significant improvement in FIM before and after inpatient rehabilitation treatment (p<0.0001). Muscle strength and walking capacity were significantly improved (p<0.01). The most important factors related to the length of inpatient rehabilitation treatment were improvement in FIM scores (Spearman’s r=0.71) and gain in lean mass (Spearman’s r=0.79). CONCLUSIONS: Rehabilitation of patients after COVID-19 recovery improves their functional status and should be considered in the post-acute phase for selected patients with COVID-19.

    Palavras-Chave: coronaviruses; therapy; patients; biological recovery

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  • IPEN-DOC 28417

    SOUZA, MARCIELLI K.R. de; CARDOSO, EDUARDO dos S.F.; FORTUNATO, GUILHERME V.; LANZA, MARCOS R.V.; NAZARIO, CARLOS E.; ZANONI, MARIA V.B.; MAIA, GILBERTO; CARDOSO, JULIANO C. . Combination of Cu-Pt-Pd nanoparticles supported on graphene nanoribbons decorating the surface of TiO2 nanotube applied for CO2 photoelectrochemical reduction. Journal of Environmental Chemical Engineering, v. 9, n. 4, p. 1-11, 2021. DOI: 10.1016/j.jece.2021.105803

    Abstract: The photoelectrocatalysis (PEC) technique was applied in CO2 reduction using different proportions of Cu, Pd, and Pt supported on graphene nanoribbons (GNR) and deposited on the surfaces of TiO2 nanotubes. Altogether, nine combinations of TiO2-NT/GNR-metal were assembled, although only three of them efficiently promoted the generation of methanol and ethanol in high quantities. Comparison with the photocatalysis, photolysis, and electrocatalysis techniques showed the extremely high efficiency of PEC, which enabled production of methanol and ethanol at levels around 19.2-fold and 44.4-fold higher, respectively, than photocatalysis, the second most efficient technique. The presence of metallic nanoparticles in the system facilitated CO2 reduction due to the trapping of the photogenerated electrons, prolonging their lifetime, lowering the reaction energy barrier for CO2 reduction, and provided active intermediates. Therefore, the assembly of these materials containing low amounts of metals is highly promising, since it can assist in alleviating environmental problems caused by CO2 emissions, while at the same time enabling the energetically efficient generation of compounds of commercial value.

    Palavras-Chave: photoelectrolysis; photocatalysis; methane; ethanol; carbon nanotubes

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  • IPEN-DOC 28416

    BALIEIRO, L.M. ; OLIVEIRA, H.B. ; TEIXEIRA, L.F.S. ; BELLINI, M.H. ; MATSUDA, M.M.N. ; ARAUJO, E.B. . Study of the automated synthesis of the radiopharmaceutical [18F]fluoroestradiol. Brazilian Journal of Radiation Sciences, v. 9, n. 3, p. 1-18, 2021. DOI: 10.15392/bjrs.v9i3.1709

    Abstract: Breast cancer is the second leading cause of cancer death among women worldwide, with an incidence increase of 25 % per year. Approximately 75 % of breast cancer cells express estrogen receptors. The 16α-[18F]fluoro-17β-estradiol, [18F]FES, is a radiopharmaceutical that binds to estrogen receptors applied in PET-CT molecular images for non-invasive diagnosis of primary and metastatic breast cancer. The objective of this work was to study the synthesis of the [18F]FES in the GE TRACERlab® MXFDG module, using the Chemical Kit and the ABX® disposable cassette. Moreover, to determine the process yield and the analytical parameters to be used in the routine production of this radiopharmaceutical. Automated synthesis took place in 75 minutes and included percolation of [18F]fluoride (18F-) in an anion exchange cartridge, elution of the cartridge, azeotropic drying in 3 steps, labeling of the precursor 3-methoxymethyl-16β,17β-epiestriol-O-cyclic sulfone (MMSE) and a hydrolysis step. The product was purified in the module by solid-phase extraction (SPE) cartridges. The radiochemical yield was reproductive, despite initial [18F]fluorine activity, and the results of quality control tests suggest that the radiopharmaceutical meets the acceptance criteria established in official monographs for other radiopharmaceuticals labeled with 18-fluor. In vivo biodistribution studies in healthy mice and mice bearing MCF7 tumors showed the specific uptake on breast tumor cells.

    Palavras-Chave: automation; fluorides; fluorine 18; fluoroestradiol; in vivo; mammary glands; mice; neoplasms; radiopharmaceuticals; quality control; synthesis; tumor cells; uptake

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  • IPEN-DOC 28415

    PANZARINI, LUZ C.G.A. ; MORANDIM-GIANNETTI, ANDREIA de A.; GUEDES, SELMA M.L. . Manufacture of non-thrombogenic polymer surfaces by gamma irradiation to induce simultaneous grafting and heparinization of thin PVC films. Journal of Bioactive and Compatible Polymers, v. 36, n. 4, p. 283-295, 2021. DOI: 10.1177/08839115211030634

    Abstract: Investigations regarding alternative methods for producing polymeric materials with hydrophilic properties have increased considerably. In this context, polymeric biomaterials with hemocompatible surface properties have been successfully obtained by grafting hydrophilic monomers onto commercial polymer films by simultaneous irradiation processes. In this study, simultaneous irradiation and grafting were used to produce a copolymer PVC-co-DMAEMA-co-heparin with hemocompatible surface properties. Characterization by FTIR of the graft copolymer indicates that the increase in monomer grafting levels inhibits the bonding sites to heparin. FTIR-PAS analyses of the graft copolymers showed that the highest graft levels were obtained for the irradiated samples containing 45% of monomer. Heparin, however, could only be detected in the irradiated samples containing 30% of DMAEMA. The analysis of the micrographs, on the other hand, showed that increasing the monomer concentration enhances surface roughness of the graft copolymers. Roughness however decreased with heparin addition. It was possible to verify that an excess of surface roughness of the graft copolymers inhibits anticoagulant properties of heparin, triggering thrombus formation. Platelet adhesion, on its turn, was not significantly affected by the presence of heparin when PVC-co-DMAEMA and PVC-co-DMAEMA-co-heparin, obtained from the systems containing 45% of monomer, are compared. The addition of heparin in the systems containing 30% of DMAEMA resulted in fewer thrombogenic surfaces.

    Palavras-Chave: copolymers; gamma radiation; polyvinyls; chlorides; blood; compatibility; blood platelets; adhesion

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  • IPEN-DOC 28414

    LINI, RENATA S.; AGUERA, RAUL G.; HOELTGEBAUM, DANIELLE; PANIZ, FERNANDA P.; PEDRON, TATIANA; CAPELARI, SILVIA; MONTEIRO, LUCILENA R. ; MACHINSKI JUNIOR, MIGUEL; NERILO, SAMUEL B.; BATISTA, BRUNO L.; OLIVEIRA, MAGDA L.F. de; MOSSINI, SIMONE A.G.. Elemental plasma content and urinary excretion in vineyard farmers occupationally exposed to pesticides in southern Brazil. Environmental Science and Pollution Research, v. 28, n. 37, p. 51841-51853, 2021. DOI: 10.1007/s11356-021-14384-6

    Abstract: This is a cross-sectional study with data and biological material collection from vineyard farmers in southern Brazil. An interview was carried out through a questionnaire developed according to the reference guide of the state government. Plasma and urine samples were screened for Aluminum, Chromium, Manganese, Copper, Nickel, Cobalt, Zinc, Arsenic, Selenium, Cadmium, Antimony, Barium, Mercury, Lead and Uranium, with a technique for fast determination of these elemental contents in biological material utilizing dynamic reaction cell inductively coupled mass spectrometry. Principal component analysis was used to identify associations between these elemental contents in biological samples and the information obtained from the interviews. The farmers showed some trace elements in plasma and urine at a higher concentration than unexposed populations from other studies. This study highlights recent findings of trace elements in biological material and their association with characteristics of pesticide use. In addition, it also contributes to the gap in the literature regarding trace elements content in plasma and urine of workers exposed to pesticides.

    Palavras-Chave: occupational exposure; elements; trace amounts; agriculture; pesticides; farms

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  • IPEN-DOC 28413

    XAVIER FILHO, JOEL M. ; SILVEIRA, I.S. ; CALDAS, L.V.E. . Radiology and mammography standard X-ray spectra simulated with the Monte Carlo method. Brazilian Journal of Radiation Sciences, v. 9, n. 2C, p. 1-13, 2021. DOI: 10.15392/bjrs.v9i2C.1670

    Abstract: Six standard beams described in the TRS-457 (IAEA): RQR 5, 8, M1, M2, M3, M4 were simulated using the EGSnrc Monte Carlo code. Each spectrum was created by an X-ray tube simulated in BEAMnrc, and attenuation curves were obtained using the application egs_kerma. The quality of each beam was evaluated by the 1st and 2nd half-value layers, the homogeneity coefficients and the mean energies. All beams presented quality parameters compatible with those described in TRS-457 (IAEA).

    Palavras-Chave: x-ray spectra; mammary glands; biomedical radiography; monte carlo method; ionizing radiations

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  • IPEN-DOC 28412

    PELOSI, A.G.; SANTOS, S.N.C.; DIPOLD, J. ; ANDRADE, M.B.; HERNANDES, A.C.; ALMEIDA, J.M.P.; MENDONCA, C.R.. Effects of modifier oxides in the nonlinear refractive index of niobium-borotellurite glasses. Journal of Alloys and Compounds, v. 878, p. 1-8, 2021. DOI: 10.1016/j.jallcom.2021.160382

    Abstract: This work investigates the influence of transition metals oxides (Ta2O5 and ZrO2) on the nonlinear refraction of niobium-borotellurite glasses prepared by melt-quenching technique. The closed-aperture Z-scan technique was used to measure the nonlinear refractive index (n2) spectrum from 470 nm to 800 nm. Also, the BGO (Boling, Glass, and Owyoung) approach was used to model nonlinear spectra, considering the oxygens present in the sample as the major contribution to the nonlinearity. The samples’ molar electronic polarizability was determined to further understanding the effect of the transition metals oxides on the optical properties. Structural analysis was performed by differential scanning calorimetry, Raman and Infrared spectroscopies. The results indicate that although the modifier oxides affect the structural units and glass polarizability, they are not enough to change the behavior of the nonlinear refractive index spectra, being the glass-matrix the main responsible for optical nonlinearity in the system studied here.

    Palavras-Chave: glass; tellurium compounds; lasers; nonlinear problems; refractive index

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  • IPEN-DOC 28411

    PRADO, EDUARDO S.P. ; MIRANDA, FELIPE de S.; RITA, CRISTIAN C.P.; SILVA, ROBERSON J. da; ESSIPTCHOUK, ALEXEI M.; PETRACONI FILHO, GILBERTO; BALDAN, MAURICIO R.; POTIENS JUNIOR, ADEMAR J. . Estudo do processamento de rejeitos radioativos sólidos compactáveis por plasma térmico / Study of compactable solid radioactive waste processing by thermal plasma. Brazilian Applied Science Review, v. 5, n. 4, p. 1795-1807, 2021. DOI: 10.34115/basrv5n4-005

    Abstract: O uso de radioisótopos para as mais diversas finalidades tem se intensificado e destacado pelos benefícios que proporcionam. A geração de energia elétrica, a indústria, a agricultura, a medicina diagnóstica e terapêutica, são alguns exemplos. Porém, essas aplicações têm como desvantagem gerar rejeitos radioativos e estes requerem tratamento apropriado para deposição final. Neste âmbito, entre as tecnologias promissoras para o tratamento de rejeitos radioativos sólidos compactáveis, a utilização de plasma térmico para gerar uma descarga de arco transferido por meio de eletrodos de grafite se mostra uma tecnologia capaz de reduzir substancialmente a massa e o volume de rejeitos radioativos após expô-los a temperaturas superiores a 3.000ºC. Os resultados obtidos se mostraram bastante satisfatórios, alcançando aproximadamente 100% de redução em 30 min de processo. Esforços futuros devem ser empregados para maior confiabilidade do sistema, eliminação de radionuclídeos voláteis no efluente gasoso e otimização completa da operação.

    Palavras-Chave: thermal analysis; plasma; therapy; radioactive wastes

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  • IPEN-DOC 28410

    SILVA, MATHEUS S.; TAVARES, ANA P.M.; COELHO, LUIZ F.L.; DIAS, LIGIA E.M.F. ; CHURA-CHAMBI, ROSA M. ; FONSECA, FLAVIO G. da; SALES, MARIA G.F.; FIGUEIREDO, EDUARDO C.. Rational selection of hidden epitopes for a molecularly imprinted electrochemical sensor in the recognition of heat-denatured dengue NS1 protein. Biosensors and Bioelectronics, v. 191, p. 1-8, 2021. DOI: 10.1016/j.bios.2021.113419

    Abstract: Rational selection of predicted peptides to be employed as templates in molecular imprinting was carried out for the heat-denatured non-structural protein 1 (NS1) of dengue virus (DENV). Conservation analysis among 301 sequences of Brazilian isolates of DENV and zika virus (ZIKV) NS1 was carried out by UniProtKB, and peptide selection was based on in silico data of the conservational, structural and immunogenic properties of the sequences. The selected peptide (from dengue 1 NS1) was synthesized and employed as a template in the electropolymerization of polyaminophenol-imprinted films on the surface of carbon screen-printed electrodes. Heat denaturation of the protein was carried out prior to analysis, in order to expose its internal hidden epitopes. After removal of the template, the molecularly imprinted cavities were able to rebind to the whole denatured protein as determined by electrochemical impedance spectroscopy. This label-free sensor was efficient to distinguish the NS1 of DENV from the NS1 of ZIKV. Additionally, the sensor was also selective for dengue NS1, in comparison with human serum immunoglobulin G and human serum albumin. Additionally, the device was able to detect the DENV NS1 at concentrations from 50 to 200 μg L−1 (RSD below 5.04%, r = 0.9678) in diluted human serum samples. The calculated LOD and LOQ were, respectively, 29.3 and 88.7 μg L−1 and each sensor could be used for six sequential cycles with the same performance.

    Palavras-Chave: viral diseases; viral diseases; zika virus; protein denaturation; polymers; sensors

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  • IPEN-DOC 28409

    MONTEIRO, LUCILENA R. ; TERZER-WASSMUTH, STEFAN; MATIATOS, IOANNIS; DOUENCE, CEDRIC; WASSENAAR, LEONARD I.. Distinguishing in-cloud and below-cloud short and distal N-sources from high-temporal resolution seasonal nitrate and ammonium deposition in Vienna, Austria. Atmospheric Environment, v. 266, p. 1-11, 2021. DOI: 10.1016/j.atmosenv.2021.118740

    Abstract: Reactive nitrogen (Nr: nitrate and ammonium) washout in Vienna (Austria) precipitation events were investigated in 2019. A total of 958 samples from 61 rain events representing >90% of annual precipitation were collected at 5–30 min intervals for nitrate (NO3−) and ammonium (NH4+) analyses and meteorological information. The data revealed systematic seasonal concentration variations for all Nr-species and a clear influence of rush-hour traffic on the kinetics of N-scavenging processes. The monthly nitrate and ammonium deposition was 0.69 ± 0.21 kg ha−1 month−1 and 1.02 ± 0.30 kg ha−1 month−1, respectively. Around 30% of nitrate and 20% of ammonium was dry deposition, and ∼30% of each N-species was from distal sources associated with rainout processes. The half-life of below-cloud N-species were similar in the warmer seasons (1.7 ± 0.2 h and 2.3 ± 0.4 h for nitrate and ammonium). In winter, the ammonium half-life was significantly lower (1.4 h). Nr removal by wet-only in-cloud scavenging was slower than predicted by empirical models. HYSPLIT trajectory analysis revealed that Nr rainout from distal sources in spring had no prevailing direction, but higher Nr contributions were from N and W. In summer and winter, air masses from W, SW and SE were related to intense, medium, and low Nr contributions, respectively. The origin and path of these trajectories coincided with known NOx hotspots in Europe.

    Palavras-Chave: atmospheric precipitations; rain; nitrates; ammonia; washout; nitrogen; pollution

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  • IPEN-DOC 28408

    HONEGGER, V.; SEO, E.S.M. ; MIRANDA, L.F.; BARBOSA, I.T.F.. Pseudoboehmite nanocarriers in cosmetic formulations. International Journal of Development Research, v. 11, n. 6, p. 47735-47738, 2021. DOI: 10.37118/ijdr.22018.06.2021

    Abstract: The aim of this study is to contribute to the preparation and characterization of nanoemulsions for anti-aging cosmetic use. Palmarosa oil and Rosehip nanoemulsions were prepared with different active cosmetic ingredients such as mandelic acid and hyaluronic acid, in concentrations of 1%, 3% and 5% (wt%) of pseudoboehmite. After the nanoemulsions analysis, they were characterized in the following parameters: visual analysis, pH, density and optical microscopy. The results obtained show the possibility of using different compositions, the most suitable were: palmarosa oil nanoemulsion with 3 or 5wt% of mandellic acid/pseudoboehmite and palmarosa oil nanoemulsion with 1,3 or 5% of hyaluronic acid/pseudobohemite.

    Palavras-Chave: consumer products; hyaluronic acid; mandelic acid; emulsions; drug delivery

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  • IPEN-DOC 28407

    SEO, EMILIA S.M. ; BARBOSA, ISABELLA T.F. ; ATHIE, ALESSANDRO A.R.; LUCA, ADRIANO C. de. Obtaining and characterization of polymeric composites reinforced with natural fibers. International Journal of Development Research, v. 11, n. 10, p. 50900-50903, 2021. DOI: 10.37118/ijdr.23135.10.2021

    Abstract: Currently, human activities cause impacts on the environment, and the generation of waste is a major concern. Among different residues will be agro-industrial residues, particularly residues of sugarcane bagasse and green coconut shell. Such chemically treated waste was reused as a polymer matrix reinforcement. In this sense, the present work aims to obtain and characterize polymeric composites reinforced with these natural fibers from green sugarcane bagasse and green coconut shell. The natural fibers were obtained by mercerization process, using sodium hydroxide and acetic acid in the optimized concentrations, washed in distilled water, dried, crushed and classified. By injection process, a polymeric composite made of high density polyethylene and different mass concentrations of natural fibers was obtained in a glass production matrix. The product obtained was characterized by a tensile test, verifying that the maximum tension obtained was 24.5 MPa for the concentrations of 3% and 5% (% wt) of natural fibers. In the compressive strength test, the sugarcane fibers showed greater tensile strength of 792.625 Kgf ± 73.873 at 5 (% wt) of fiber used, while for the higher coconut fibers, the tensile strength of 925,000 Kgf ± 12.832 at 3 (% wt) of fiber.

    Palavras-Chave: chemical composition; reinforced materials; polymers; fibers; polyethylenes; density; environmental impacts

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  • IPEN-DOC 28406

    PRADO, E.S.P. ; MIRANDA, F.S.; ARAUJO, L.G. ; PETRACONI, G.; BALDAN, M.R.; ESSIPTCHOUK, A.; POTIENS JUNIOR, A.J. . Experimental study on treatment of simulated radioactive waste by thermal plasma: temporal evaluation of stable Co and Cs. Annals of Nuclear Energy, v. 160, p. 1-6, 2021. DOI: 10.1016/j.anucene.2021.108433

    Abstract: Thermal plasma technology is a process that demonstrates high performance for the processing of different types of waste. This technology can also be applied in the treatment of radioactive wastes, which requires special care. Beyond that, volumetric reduction, inertization, as well as a cheap and efficient process are necessary. In this context, the purpose of this paper is to demonstrate the application of thermal plasma technology for the treatment of solid radioactive waste. For this, stable Co and Cs were used to simulate compactable and non-compactable radioactive waste; about 0.8 g Co and 0.6 g Cs were added in each experimental test. The experimental tests were conducted using plasma of transferred arc electric discharge generated by the graphite electrode inside the process reactor. The behavior and distribution of the radionuclides present in the waste were assessed during the plasma process. The results show that the significant amounts of Co and Cs leave the melt by volatilization and are transferred to the gas phase with a small portion retained in the molten slag. The retention rate of Co in the slag phase is about 0.03% and 0.30% for compactable and non-compactable waste, respectively. On the other hand, Cs is completely transferred to the gas phase when added to the compactable waste. Conversely, when in the non-compactable waste, only 1.4% Cs is retained.

    Palavras-Chave: radioactive wastes; plasma; waste processing; thermochemical processes

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  • IPEN-DOC 28405

    MARTINS, ANA P.G.; RIBEIRO, ANDREZA P.; FERREIRA, MAURICIO L.; MARTINS, MARCO A.G.; NEGRI, ELNARA M.; SCAPIN, MARCOS A. ; OLIVEIRA, ANDERSON de; SAIKI, MITIKO ; SALDIVA, PAULO H.N.; LAFORTEZZA, RAFFALE. Infraestrutura verde para monitorar e minimizar os impactos da poluição atmosférica. Estudos Avançados, v. 35, n. 102, p. 31-57, 2021. DOI: 10.1590/s0103-4014.2021.35102.003

    Abstract: O Material Particulado (MP) está entre os principais contaminantes do ar. A Infraestrutura Verde (IV) vem sendo reconhecida como alternativa para melhorar a qualidade do ar. As árvores podem afetar diretamente os níveis de MP, interceptando partículas em sua superfície. Devido a essa capacidade, esta pesquisa teve como objetivo contribuir com informações sobre a viabilidade da vegetação verde para interceptar e identificar as principais fontes de poluentes atmosféricos. Amostras de cascas de árvores de parques urbanos de São Paulo (SP) foram utilizadas como monitor biológico de poluentes atmosféricos. Foi observado um decaimento exponencial das concentrações e aprisionamento de poluentes em direção à região mais interna dos parques. Além disso, foi possível distinguir a emissão de veículos leves das emissões de veículos pesados. O baixo custo do monitoramento e sua eficácia mostram que a IV ocupa papel de destaque na melhoria da saúde e a qualidade de vida das pessoas, bem como nas ações que buscam atenuar os efeitos da poluição do ar em cidades de médio e grande porte.

    Palavras-Chave: air pollution monitoring; bark; ecological concentration; elements; emission; particulates; plants; pollutants; urban areas; vehicles; x-ray fluorescence analysis

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  • IPEN-DOC 28404

    SENIWAL, BALJEET; THIPE, VELAPHI C. ; SINGH, SUKHVIR; FONSECA, TELMA C.F.; FREITAS, LUCAS F. de . Recent advances in brachytherapy using radioactive nanoparticles: an alternative to seed-based brachytherapy. Frontiers in Oncology, v. 11, p. 1-24, 2021. DOI: 10.3389/fonc.2021.766407

    Abstract: Interstitial brachytherapy (BT) is generally used for the treatment of well-confined solid tumors. One example of this is in the treatment of prostate tumors by permanent placement of radioactive seeds within the prostate gland, where low doses of radiation are delivered for several months. However, successful implementation of this technique is hampered due to several posttreatment adverse effects or symptoms and operational and logistical complications associated with it. Recently, with the advancements in nanotechnology, radioactive nanoparticles (radio-NPs) functionalized with tumor-specific biomolecules, injected intratumorally, have been reported as an alternative to seed-based BT. Successful treatment of solid tumors using radio-NPs has been reported in several preclinical studies, on both mice and canine models. In this article, we review the recent advancements in the synthesis and use of radio-NPs as a substitute to seed-based BT. Here, we discuss the limitations of current seed-based BT and advantages of radio-NPs for BT applications. Recent progress on the types of radio-NPs, their features, synthesis methods, and delivery techniques are discussed. The last part of the review focuses on the currently used dosimetry protocols and studies on the dosimetry of nanobrachytherapy applications using radio-NPs. The current challenges and future research directions on the role of radio-NPs in BT treatments are also discussed.

    Palavras-Chave: radioactivity; nanoparticles; injection; neoplasms; internal irradiation; brachytherapy

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  • IPEN-DOC 28403

    VILELA JUNIOR, RAFAEL de A.; ARANHA, LUIS C. ; ELIAS, CARLOS N.; MARTINEZ, ELIZABETH F.. In vitro analysis of prosthetic abutment and angulable frictional implant interface adaptation: mechanical and microbiological study. Journal of Biomechanics, v. 128, p. 1-6, 2021. DOI: 10.1016/j.jbiomech.2021.110733

    Abstract: The aim of this study was to evaluate, in vitro, the microbiological sealing at the implant and different angles frictional prosthetic abutment interface, submitted or not to mechanical cycling, as well as the deactivation force and evaluation of the implant-abutment interface by scanning electron microscopy. For this study, the sealing capacity of eighty sets of abutments/implants of each angle, with and without mechanical cycling, with internal conical connection (locking tapper) (4.3 mm × 9.0 mm) constituted in Titanium alloy (Ti6Al4V), and stainless steel angled prosthetic abutment was evaluated (18Cr14Ni2.5Mo) according to ASTM F138-13a (Arcsys, FGM, Joinville, Brazil), 6 mm high and 4.2 mm in diameter at the coronary portion, and 3.5 mm high transmucosal, in 4 different angles (0, 5, 10 and 20°). After in vitro tests, 100% biological sealing was observed at the implant / prosthetic abutment interface within cycled and non-cycled conditions, for the straight, 5, 10 and 20° inclination groups. There was no statistically significant difference in the removal force of the prosthetic abutments at different angles, under non-cycled conditions; however, under mechanical loading, the deactivation force was significantly higher for straight prosthetic abutments than with 10 and 20° of angulation. Surface analysis revealed good adaptation between implants and abutments, and the presence of wear areas, independently of mechanical loading. It is concluded that the analysis of implant and prosthetic abutment interface revealed good adaptation between the parts, for all analyzed samples.

    Palavras-Chave: microorganisms; chemical analysis; in vitro; sealing materials; implants

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  • IPEN-DOC 28402

    GUZMAN, JHOAN; NOBRE, RAFAEL de M.; JUNIOR, RODRIGUES D.L.; MORAIS, WILLY A. de; NUNUES, ENZO R.; BAYERLEIN, D.L. ; FALCAO, R.B.; SALLICA-LEVA, EDWIN; OLIVEIRA, HENRIQUE R.; CHASTINET, VICTOR L.; LANDGRAF, FERNANDO J.G.. Comparing spherical and irregularly shaped powders in laser powder bed fusion of Nb47Ti alloy. Journal of Materials Engineering and Performance, v. 30, n. 9, SI, p. 6557–6567, 2021. DOI: 10.1007/s11665-021-05916-9

    Abstract: Literature reports that irregularly shaped powder has lower flowability and apparent density than spherical shaped powder, factors that hinder its use in additive manufacturing, although its cost is potentially lower. In this study, four samples of Nb47Ti alloy manufactured by laser powder bed fusion from plasma atomized (PA) and hydride–dehydride (HDH) powders with different scanning strategies and interstitial element content were compared. Laser power levels of 200 W and 300 W were investigated. To keep a constant powder mass under the laser beam, the processing table displacement for samples from the HDH powder was twice larger than the 30 µm used for samples from the PA powder procedure, due to the lower apparent density of the HDH powder. It was possible to achieve porosity levels below 1% with both powders. However, the power of 200 W generated 13% of porosity in the HDH samples. A similar microstructure formed by melt pools and cellular dendritic structure in a β phase matrix of body-centered cubic (BCC) structure was obtained in all samples. Furthermore, the low interstitial element content of samples from PA powder resulted in lower microhardness when compared to the higher interstitial element content of samples from HDH powder.

    Palavras-Chave: microstructure; hydrides; porosity; powders; additives; manufacturing

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  • IPEN-DOC 28392

    CHMIELEWSKI, ANDRZEJ G.; HAN, BUMSOO; SABHARWAL, SUNIL; SAMPA, MARIA H. . Environmental protection: reducing environmental pollution. In: GREENSPAN, EHUD (Ed.). Encyclopedia of nuclear energy. Amsterdam: Elsevier, 2021. p. 520-526, v. 4, DOI: 10.1016/B978-0-12-409548-9.12331-0

    Palavras-Chave: water treatment; environmental protection; ionizing radiations; flue gas; electron beams; gamma radiation

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  • IPEN-DOC 28400

    KENIG, GABRIEL; TAKARA, ERIKI M. ; KANESHIRO, PERCY J.I.; NASCIMENTO, JESSICA C.; GARCIA NETO, JOSE dos S. ; KANASHIRO, LUIS R.; ASATO, OSVALDO L.; NAKAMOTO, FRANCISCO Y.. Desenvolvimento de sistema de controle para aparato de soldagem por atrito rotativo. In: IEEE/IAS INTERNATIONAL CONFERENCE ON INDUSTRY APPLICATIONS, 14th, August 16-18, 2021, Online. Proceedings... São Paulo, SP: Escola Politécnica da Universidade de São Paulo, 2021.

    Abstract: The friction rotary welding (FRW) is a solid state material welding method that is able to weld not only similar but dissimilar materials as well. The FRW allows the union between two pieces of metal converting mechanical energy into thermal welding. The friction generated by the rotational momentum between the two surfaces generates enough heat to fuse the materials without reaching the fusion temperature, this mechanical connection can be done through atomic diffusion. The equipment needed to perform the FRW process needed a new control system. This paper presents the development of this new control system through a top-down approach based on successive refinement using modeling tools developed to model dynamic systems to discrete events. The result presented in this paper is the control system algorithm in Enhanced Mark Flow Graph, a high level Petri Net derivative and a systematic to map the model in C++ in order to use it in a PIC microcontroller.

    Palavras-Chave: friction welding; control systems; control equipment; diagrams; simulators

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  • IPEN-DOC 28399

    CABETE, HENRIQUE V. ; GOTO, R.E.; SEMMLER, R. ; RODRIGUES JR., ORLANDO . Influência de detectores de radiação no cálculo da dose glandular média (DGM). In: CONGRESSO BRASILEIRO DE METROLOGIA, 11; CONGRESSO BRASILEIRO DE METROLOGIA DAS RADIAÇÕES IONIZANTES, 8, 18-21 de outubro, 2021, Online. Anais... Rio de Janeiro: Sociedade Brasileira de Metrologia, 2021.

    Abstract: Após a atualização da Instrução Normativa IN 92 que dispõe sobre requisitos sanitários para a garantia da qualidade e da segurança de sistemas de mamografia em 27 de maio de 2021, inseriu-se um novo parâmetro para a avaliação das doses típicas, a dose glandular média (DGM). Diante deste contexto, objetivou-se verificar a influência dos detectores e de outros fatores na estimativa da DGM. Verificou-se que o espalhamento da radiação na bandeja de compressão mamográfica contribuiu para um aumento nos valores estimados entre 3,3 e 4,9%. Quando reduzido o espalhamento, os resultados das estimativas para os quatro detectores usados na avaliação tiveram uma diferença de no máximo de 7,1% e 2,1% quando comparados apenas detectores específicos para a modalidade de mamografia. Verificou-se que o retroespalhamento não contribuiu de forma significativa para a alteração dos resultados.

    Palavras-Chave: radiation doses; mammary glands; images; biomedical radiography; kerma; regulations; brazilian organizations

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  • IPEN-DOC 28398

    CAIANO, SOLANO R.; CRUZ, VANDERLEI; BOTTARO, MARCIO; LEITE, MARCO A.L.; MURATA, HELIO M.; BONIFACIO, DANIEL A.B. . Dependência da resolução em energia em função da temperatura de uma fotomultiplicadora de silício acoplada a um cristal cintilador. In: CONGRESSO BRASILEIRO DE METROLOGIA, 11; CONGRESSO BRASILEIRO DE METROLOGIA DAS RADIAÇÕES IONIZANTES, 8, 18-21 de outubro, 2021, Online. Anais... Rio de Janeiro: Sociedade Brasileira de Metrologia, 2021.

    Abstract: A fotomultiplicadora de silício (SiPM – “Silicon Photomultiplier”) tornou-se um dispositivo importante capaz de detectar a radiação X e gama. Uma desvantagem dessa tecnologia é a dependência de temperatura que o material semicondutor possui. A caracterização em energia da SiPM, possibilita mensurar parâmetros importantes sobre o detector. A SiPM acoplada ao cristal cintilador, compõe o aparato experimental e as medidas são realizadas através de um osciloscópio. Os resultados apresentados demonstram o comportamento esperado da SiPM sem a influência do cristal cintilador. Com a análise dos espectros em energia, é possível desenvolver um método de controle capaz de minimizar a influência da dependência da temperatura.

    Palavras-Chave: silicon diodes; photomultipliers; energy resolution; temperature dependence; crystals; phosphors

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  • IPEN-DOC 28397

    MANTUANO, A.; RODRIGUES JR., ORLANDO ; SALATA, C.; PICKLER, A.; MOTA, C.L.; PACIFICO, L. de C.; MAGALHÃES, L.A.G.; ALMEIDA, C.E. de. Comparação entre os dosímetros Fricke e alanina para a dosimetria de irradiadores de sangue. In: CONGRESSO BRASILEIRO DE METROLOGIA, 11; CONGRESSO BRASILEIRO DE METROLOGIA DAS RADIAÇÕES IONIZANTES, 8, 18-21 de outubro, 2021, Online. Anais... Rio de Janeiro: Sociedade Brasileira de Metrologia, 2021.

    Abstract: O dosímetro Fricke vem mostrando grande potencial para a determinação na dose absorvida na água. Reconhecido como padrão primário pelo TRS398, vem mostrando resultados de alta qualidade metrológica quando utilizado em laboratórios de metrologia em alguns laboratórios no mundo. O dosímetro alanina/RPE é um padrão secundário reconhecido pela AIEA de uso em especial para doses altas para irradiações com fótons e elétrons pode ser utilizado como dosímetro secundário, de transferência e de referência, para doses entre 1Gy e 10kGy. Este trabalho teve como objetivo comparar os resultados da dosimetria realizada em irradiadores de sangue com o dosímetro Fricke pelo grupo do Laboratório de Ciências Radiológicas (LCR/UERJ) com os resultados da dosimetria realizada com alanina pelo Laboratório de Dosimetria de Doses Altas (LDA/IPEN/CNEN). Os dois laboratórios realizaram as medidas no Hemocentro do Rio de Janeiro (HEMORIO), utilizando o fantoma patenteado pelo LCR/UERJ. Os resultados apresentaram uma concordância de 2,2% entre as médias das doses na região central do fantoma com ambos os sistemas. Este trabalho apresenta os resultados preliminares sem incluir pequenas correções que estão sendo definidas através das simulações Monte Carlo, para permitir o cálculo da incerteza final em continuidade a este trabalho.

    Palavras-Chave: chemical dosemeters; alanines; dosimetry; blood; irradiation

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  • IPEN-DOC 28396

    HIGASHI, RODRIGO J.A. ; CAMARGO, IARA M.C. de ; BOSCOV, MARIA E.G.. Características químicas do lodo da ETA de Cubatão, São Paulo. In: ENCONTRO NACIONAL DE LODO DE ESTAÇÃO DE TRATAMENTO DE ÁGUA, 1, 17-19 de junho, 2021, Online. Anais... São Paulo: ITA/UNESP/USP, 2021. p. 18-20. DOI: 10.28927/2021.leta-1

    Palavras-Chave: water treatment plants; sludges; sediments; chemical composition; chemical analysis

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  • IPEN-DOC 28395

    ROCHA, KAIO; COSTA, MATHEUS; SAVOINE, MARCIA . Monitoring network for nuclear research laboratory using WSN and IoT devices. In: INTERNATIONAL MULTI-CONFERENCE ON COMPLEXITY, INFORMATICS AND CYBERNETICS, 11th, March 10-13, 2020, Florida, USA. Proceedings... Florida, USA: International Institute of Informatics and Systemics, 2020. p. 108-111.

    Abstract: This work presents a proposal of implementation of an automatic monitoring system for environments who does experimentation and manipulation of ionizing radioactive particles, having as a base scenario the structures off nuclear energy research laboratories through sensors coupled to integrated microprocessor circuit boards, to carry out the communication between the sensors a Wireless Sensor Network with star topology was raised by resorting in the Internet of Things paradigm. For the network security, the concept of layered access level was applied, specifically, access level according to the criticality off the process and environment whose the sensors are exposed to.

    Palavras-Chave: neural networks; internet; computer networks; monitoring; sensors

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  • IPEN-DOC 28394

    TESSARO, ANA P.G. ; GERALDO, BIANCA ; SOUZA, DAIANE C.B. de ; ROMERO, FERNANDA; BISURI, INDRANIL; MARUMO, JULIO T. ; CHEBERLE, LUAN T.V.; SACHDEVA, MAHIMA; ROSA, MYCHELLE M.L.; ROLINDO, NATALIE C. ; SMITH, RICARDO B. ; VICENTE, ROBERTO ; SALVETTI, TEREZA C. . Essays on nuclear energy and radioactive waste management. São Paulo, SP: Gênio Criador Editora, 2021. 171 p.

    Palavras-Chave: radioactive wastes; waste management; nuclear energy

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  • IPEN-DOC 28401

    MACEDO, FERNANDA de M. ; CORREA, THAIS ; ARAUJO, ELAINE C. ; ANDRADE, IZABEL da S. ; GUARDANI, ROBERTO; VESELOVSKII, IGOR; LANDULFO, EDUARDO . Methane detection in the lower troposphere related to the burning of biomass and leakage in a petrochemical pole, using Raman lidar technique / Detecção de metano em baixa troposfera relacionada à queima de biomassa e gases fugitivos em pólo petroquímico, utilizando a técnica de raman lidar. Holos Environment, v. 21, n. 1, p. 138-152, 2021. DOI: 10.14295/holos.v21i1.12425

    Abstract: Fugitive emissions, defined as unintended or irregular leaks of gases and vapors, are an important source of pollutants to the atmosphere, which is difficult to monitor and control. These sources are present in different sites, especially in regions that are growing in size and economic activity. In this study, we present the results of the capability to detect methane profiles at low troposphere combining data retrieval correlations between a rotacional/vibracional Raman lidar (RVRL) and a cavity ring-down spectrometer (CRDS). The measurements were made at two different sites, metropolitan area of São Paulo (MSP) and industrial area of Cubatão (IC). The lidar is based on a tripled Nd:YAG laser with a 20 Hz repetition rate, operating on the 355 nm wavelength elastic channel, the 353 nm and 396 nm wavelength inelastic channels. A measurement protocol was established, considering acquisition time for signal accumulation, climatic conditions and data above and below the planetary boundary layer. The idea was to establish specific measurement procedures for situations related to product leakage in the oil process and natural events, such as biomass burning. With over 150 hours of data acquisition, the results pointed the possibility of analyzing data from distances up to 1500 m with an initial resolution of 7.5 m which was extended to 100 - 300 m after data smoothing for obtaining final results. The concentration was calculated from the ratio between the methane Raman backscatter signal and the nitrogen signal, at 396 nm and 353 nm, respectively. The temporal variation of methane concentrations was correlated with CRDS data, in order to obtain a first degree calibration.

    Palavras-Chave: methane; detection; optical radar; greenhouse gases; remote sensing; raman spectra

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  • IPEN-DOC 28391

    BARBOSA, WANESSA ; COSTA, ISOLDA . Caracterização e comportamento de corrosão da liga 2098-T351 AI-Cu-Li com diferentes acabamentos superficiais. In: PROGRAMA INSTITUCIONAL DE BOLSAS DE INICIAÇÃO CIENTÍFICA; SEMINÁRIO ANUAL PIBIC, 27.; SEMINÁRIO ANUAL PROBIC, 18.; SEMINÁRIO ANUAL PIBITI, 11, 6-7 de dezembro, 2021, Online. Resumo expandido... São Paulo, SP: IPEN-CNEN/SP, 2021. p. 104-105.

    Palavras-Chave: aluminium alloys; copper alloys; lithium alloys; corrosion resistant alloys; chlorides; anodization; surface coating

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  • IPEN-DOC 28390

    WATANABE, TAMIRES ; MARUMO, JULIO T. ; ARAUJO, LEANDRO G. de . Biossorção de urânio por meio de hidroxiapatita e farinha de osso: análise experimental. In: PROGRAMA INSTITUCIONAL DE BOLSAS DE INICIAÇÃO CIENTÍFICA; SEMINÁRIO ANUAL PIBIC, 27.; SEMINÁRIO ANUAL PROBIC, 18.; SEMINÁRIO ANUAL PIBITI, 11, 6-7 de dezembro, 2021, Online. Resumo expandido... São Paulo, SP: IPEN-CNEN/SP, 2021. p. 102-103.

    Palavras-Chave: uranium; radioisotopes; calcium phosphates; fertilizers; bone tissues; sorption; radioactive wastes

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  • IPEN-DOC 28389

    MEDEIROS, PEDRO A. ; LANDULFO, EDUARDO . Metodologia de tratamento de dados LIDAR com python e estruturação da obtenção de dados. In: PROGRAMA INSTITUCIONAL DE BOLSAS DE INICIAÇÃO CIENTÍFICA; SEMINÁRIO ANUAL PIBIC, 27.; SEMINÁRIO ANUAL PROBIC, 18.; SEMINÁRIO ANUAL PIBITI, 11, 6-7 de dezembro, 2021, Online. Resumo expandido... São Paulo, SP: IPEN-CNEN/SP, 2021. p. 98-101.

    Palavras-Chave: computer codes; programming; optical radar; data compilation; data processing

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  • IPEN-DOC 28388

    NASCIMENTO, PAMELA F. do ; VIEIRA, DANIEL P. . Efeito da radiação (gama, 60Co) em esferoides de adenocarcinoma mamário. In: PROGRAMA INSTITUCIONAL DE BOLSAS DE INICIAÇÃO CIENTÍFICA; SEMINÁRIO ANUAL PIBIC, 27.; SEMINÁRIO ANUAL PROBIC, 18.; SEMINÁRIO ANUAL PIBITI, 11, 6-7 de dezembro, 2021, Online. Resumo expandido... São Paulo, SP: IPEN-CNEN/SP, 2021. p. 96-97.

    Palavras-Chave: neoplasms; carcinomas; mammary glands; spheroids; gamma radiation; cobalt 60; cell cultures

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  • IPEN-DOC 28387

    PINGARO, MILLENA C. ; FONSECA, FABIO C. . Desenvolvimento de catalisadores "core-shell' para reação de reforma a vapor do etanol. In: PROGRAMA INSTITUCIONAL DE BOLSAS DE INICIAÇÃO CIENTÍFICA; SEMINÁRIO ANUAL PIBIC, 27.; SEMINÁRIO ANUAL PROBIC, 18.; SEMINÁRIO ANUAL PIBITI, 11, 6-7 de dezembro, 2021, Online. Resumo expandido... São Paulo, SP: IPEN-CNEN/SP, 2021. p. 94-95.

    Palavras-Chave: catalysis; hydrogen; ethanol; carbon

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  • IPEN-DOC 28386

    BENEDITO, MARIA G.M. ; ZAMBONI, CIBELE B. . Determinação de ferro sanguíneo por FRX na população feminina acima de 60 anos: alternativa para prática clínica na medicina geriátrica. In: PROGRAMA INSTITUCIONAL DE BOLSAS DE INICIAÇÃO CIENTÍFICA; SEMINÁRIO ANUAL PIBIC, 27.; SEMINÁRIO ANUAL PROBIC, 18.; SEMINÁRIO ANUAL PIBITI, 11, 6-7 de dezembro, 2021, Online. Resumo expandido... São Paulo, SP: IPEN-CNEN/SP, 2021. p. 92-93.

    Palavras-Chave: blood; iron; plasma diagnostics; x-ray fluorescence analysis; females; medicine; diagnostic uses

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  • IPEN-DOC 28385

    SILVA, MARIA E. da C. ; GERALDO, AUREA B.C. . Avaliação do teor de nitratos em águas potáveis por espectrofotometria Uv-vis. In: PROGRAMA INSTITUCIONAL DE BOLSAS DE INICIAÇÃO CIENTÍFICA; SEMINÁRIO ANUAL PIBIC, 27.; SEMINÁRIO ANUAL PROBIC, 18.; SEMINÁRIO ANUAL PIBITI, 11, 6-7 de dezembro, 2021, Online. Resumo expandido... São Paulo, SP: IPEN-CNEN/SP, 2021. p. 90-91.

    Palavras-Chave: drinking water; nitrates; spectrophotometry; ground water

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  • IPEN-DOC 28384

    RIBEIRO, LUCAS A. de S. ; FREITAS, ANDERSON Z. . Calibração da pressão de punho através da técnica da Tomografia por Coerência Óptica (OCT). In: PROGRAMA INSTITUCIONAL DE BOLSAS DE INICIAÇÃO CIENTÍFICA; SEMINÁRIO ANUAL PIBIC, 27.; SEMINÁRIO ANUAL PROBIC, 18.; SEMINÁRIO ANUAL PIBITI, 11, 6-7 de dezembro, 2021, Online. Resumo expandido... São Paulo, SP: IPEN-CNEN/SP, 2021. p. 88-89.

    Palavras-Chave: hands; pressing; tomography; coherent radiation; optical systems; computer codes; measuring methods

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  • IPEN-DOC 28383

    ROCHA, LEONARDO W.P. de S. ; MARUMO, MARIA H.B. . Produção de esferóides mistos de células epiteliais prostáticas humanas e de adenocarcinoma prostático para testes de antitumorais. In: PROGRAMA INSTITUCIONAL DE BOLSAS DE INICIAÇÃO CIENTÍFICA; SEMINÁRIO ANUAL PIBIC, 27.; SEMINÁRIO ANUAL PROBIC, 18.; SEMINÁRIO ANUAL PIBITI, 11, 6-7 de dezembro, 2021, Online. Resumo expandido... São Paulo, SP: IPEN-CNEN/SP, 2021. p. 86-87.

    Palavras-Chave: neoplasms; carcinomas; prostate; spheroids; cell cultures; dyes

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  • IPEN-DOC 28382

    CANTEIRO, LEONARDO T. ; GENOVA, LUIS A. . Estudo do processo de síntese de microesferas de titanato de sódio. In: PROGRAMA INSTITUCIONAL DE BOLSAS DE INICIAÇÃO CIENTÍFICA; SEMINÁRIO ANUAL PIBIC, 27.; SEMINÁRIO ANUAL PROBIC, 18.; SEMINÁRIO ANUAL PIBITI, 11, 6-7 de dezembro, 2021, Online. Resumo expandido... São Paulo, SP: IPEN-CNEN/SP, 2021. p. 84-85.

    Palavras-Chave: titanates; microspheres; sodium compounds; titanium oxides; crystallization; waste water

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  • IPEN-DOC 28381

    MOURA, LARISSA A.S. ; ZAMBONI, CIBELE B. . Avaliação da concentração de fósforo em sangue total utilizando a técnica FRXDE. In: PROGRAMA INSTITUCIONAL DE BOLSAS DE INICIAÇÃO CIENTÍFICA; SEMINÁRIO ANUAL PIBIC, 27.; SEMINÁRIO ANUAL PROBIC, 18.; SEMINÁRIO ANUAL PIBITI, 11, 6-7 de dezembro, 2021, Online. Resumo expandido... São Paulo, SP: IPEN-CNEN/SP, 2021. p. 82-83.

    Palavras-Chave: blood; phosphorus; plasma diagnostics; x-ray fluorescence analysis

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  • IPEN-DOC 28380

    HARDER, LARISSA N.C. ; ARTHUR, VALTER . Efeitos da radiação gama na conservação e desinfestação de frutos de lichia Litchi chinensis. In: PROGRAMA INSTITUCIONAL DE BOLSAS DE INICIAÇÃO CIENTÍFICA; SEMINÁRIO ANUAL PIBIC, 27.; SEMINÁRIO ANUAL PROBIC, 18.; SEMINÁRIO ANUAL PIBITI, 11, 6-7 de dezembro, 2021, Online. Resumo expandido... São Paulo, SP: IPEN-CNEN/SP, 2021. p. 80-81.

    Palavras-Chave: gamma radiation; fruits; food processing; sterilization; radiopreservation

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  • IPEN-DOC 28379

    FRANCO, KELLY P.C. ; ROSSI, JESUALDO L. . Modificações de superfície de ligas de zircônio e titânio. In: PROGRAMA INSTITUCIONAL DE BOLSAS DE INICIAÇÃO CIENTÍFICA; SEMINÁRIO ANUAL PIBIC, 27.; SEMINÁRIO ANUAL PROBIC, 18.; SEMINÁRIO ANUAL PIBITI, 11, 6-7 de dezembro, 2021, Online. Resumo expandido... São Paulo, SP: IPEN-CNEN/SP, 2021. p. 78-79.

    Palavras-Chave: zirconium alloys; titanium alloys; surfaces; surface properties; roughness

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  • IPEN-DOC 28378

    PAULA, JOSE H. de ; SILVA, PAULO S.C. da . Avaliação da qualidade da área costeira da região de Caraguatatuba utilizando conchas de organismos bivalves. In: PROGRAMA INSTITUCIONAL DE BOLSAS DE INICIAÇÃO CIENTÍFICA; SEMINÁRIO ANUAL PIBIC, 27.; SEMINÁRIO ANUAL PROBIC, 18.; SEMINÁRIO ANUAL PIBITI, 11, 6-7 de dezembro, 2021, Online. Resumo expandido... São Paulo, SP: IPEN-CNEN/SP, 2021. p. 76-77.

    Palavras-Chave: water pollution; coastal waters; seawater; aquatic ecosystems; shells; molluscs; neutron activation analysis; contamination; metals; absorption spectroscopy

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  • IPEN-DOC 28377

    PEDRO, JONAS F. ; DAMATTO, SANDRA R. . Radioatividade natural presente em castanha de caju, castanha do Brasil e amendoim. In: PROGRAMA INSTITUCIONAL DE BOLSAS DE INICIAÇÃO CIENTÍFICA; SEMINÁRIO ANUAL PIBIC, 27.; SEMINÁRIO ANUAL PROBIC, 18.; SEMINÁRIO ANUAL PIBITI, 11, 6-7 de dezembro, 2021, Online. Resumo expandido... São Paulo, SP: IPEN-CNEN/SP, 2021. p. 74-75.

    Palavras-Chave: natural radioactivity; chestnuts; peanuts; ecosystems; radioecological concentration; radioisotopes

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  • IPEN-DOC 28376

    SILVA, GIOVANA D. da ; DERNOWSEK, JANAINA de A. . Produção de construtos celulares tridimensionais bioimpressos de fibroblastos murinos (NIH/3T3). In: PROGRAMA INSTITUCIONAL DE BOLSAS DE INICIAÇÃO CIENTÍFICA; SEMINÁRIO ANUAL PIBIC, 27.; SEMINÁRIO ANUAL PROBIC, 18.; SEMINÁRIO ANUAL PIBITI, 11, 6-7 de dezembro, 2021, Online. Resumo expandido... São Paulo, SP: IPEN-CNEN/SP, 2021. p. 72-73.

    Palavras-Chave: fibroblasts; hydrogels; cell cultures; sodium; alginates; cellulose; pluronics

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  • IPEN-DOC 28375

    ERETIDES, GABRIEL T. ; YAMAGATA, CHIEKO . Síntese e caracterização do pó cerâmico do sistema SiO,-ZrO, pelo método sol-gel para aplicação como biomaterial. In: PROGRAMA INSTITUCIONAL DE BOLSAS DE INICIAÇÃO CIENTÍFICA; SEMINÁRIO ANUAL PIBIC, 27.; SEMINÁRIO ANUAL PROBIC, 18.; SEMINÁRIO ANUAL PIBITI, 11, 6-7 de dezembro, 2021, Online. Resumo expandido... São Paulo, SP: IPEN-CNEN/SP, 2021. p. 70-71.

    Palavras-Chave: ceramics; silicon oxides; powders; zirconium oxides; sol-gel process; biological effects

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  • IPEN-DOC 28374

    RODRIGUES, ADRIANA de S. ; LUGAO, ADEMAR B. ; BATISTA, JORGE G. dos S. ; KUCHINSKI, ADRIANA ; FREITAS, LUCAS F. de ; CRUZ, CASSIA P.C. da . Desenvolvimento de nanopartículas de ouro (AuNPs) para teranóstica. In: PROGRAMA INSTITUCIONAL DE BOLSAS DE INICIAÇÃO CIENTÍFICA; SEMINÁRIO ANUAL PIBIC, 27.; SEMINÁRIO ANUAL PROBIC, 18.; SEMINÁRIO ANUAL PIBITI, 11, 6-7 de dezembro, 2021, Online. Resumo expandido... São Paulo, SP: IPEN-CNEN/SP, 2021. p. 68-69.

    Palavras-Chave: nanoparticles; theranostics; cytology; toxicity; in vitro; gold

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  • IPEN-DOC 28367

    BIANCOLLI, ANA L.G. ; BARBOSA, ANDREY S. ; KODAMA, YASKO ; SOUZA JUNIOR, ROGERIO R. de; LANFREDI, ALEXANDRE J.C.; FONSECA, FABIO C. ; REY, JOSE F.Q.; SANTIAGO, ELISABETE I. . Unveiling the influence of radiation-induced grafting methods on the properties of polyethylene-based anion-exchange membranes for alkaline fuel cells. Journal of Power Sources, v. 512, p. 1-12, 2021. DOI: 10.1016/j.jpowsour.2021.230484

    Abstract: Anion-exchange membranes (AEM) are envisioned as the enabling materials for the widespread use of cost-effective and efficient polymeric fuel cells. Advancing the understanding of the effect of radiation-induced grafting (RIG) method on the final properties of AEMs is crucial to boost the performance of anion-exchange membrane fuel cells (AEMFCs). The present study provides a systematic investigation of the effect of RIG methods on physicochemical properties of LDPE-based AEMs with similar degree of grafting (DoG) and ion exchange capacity (IEC). Samples grafted by two methods − pre-irradiation (PIM) and simultaneous (SM) − have the same molecular structure, but distinct physicochemical properties due to markedly differences in the degree of crosslinking. Detailed characterization of AEMs showed that RIG method determines the mechanical properties, water transport, and the distribution of ionic groups, which have a direct impact on fuel cell performance and durability. The discussed results show that grafting step directly influences the internal structure and morphology. Controlling the synthesis parameters during RIG is a key feature to design AEMs with enhanced properties that lead to high AEMFC performance and stability.

    Palavras-Chave: ion exchange; anions; membranes; fuel cells; irradiation

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  • IPEN-DOC 28366

    CABRAL, FERNANDA V. ; SOUZA, TIAGO H. dos S.; SELLERA, FABIO P.; FONTES, ADRIANA; RIBEIRO, MARTHA S. . Towards effective cutaneous leishmaniasis treatment with light-based technologies. A systematic review and meta-analysis of preclinical studies. Journal of Photochemistry and Photobiology B: Biology, v. 221, p. 1-8, 2021. DOI: 10.1016/j.jphotobiol.2021.112236

    Abstract: Cutaneous leishmaniasis (CL) is a neglected disease that represents a serious global public health concern. We performed a systematic review with meta-analysis targeting the use of light-based therapies on CL in preclinical studies since they are essential to identify the benefits, challenges, and limitations of proposing new technologies to fight CL. We searched Pubmed and Web of Science to include original preclinical researches in English that used light-based technologies to fight CL. Inclusion criteria encompassed any animal model for CL induction, an untreated infected group as the comparator, reliable and consistent methodology to develop and treat CL, focus on an antimicrobial therapeutic approach, and data for lesion size and/or parasite load in the infection site. We identified eight eligible articles, and all of them used photodynamic therapy (PDT). For the meta-analysis, three studies were included regarding the parasite load in the infection site and four comprised the lesion size. No overall statistically significant differences were observed between untreated control and PDT groups for parasite load. Differently, PDT significantly reduced the lesion size regardless of the protocol used to treat CL (in mm, SMD: -1.90; 95% CI: −3.74 to −0.07, p = 0.04). This finding is particularly encouraging since CL promotes disfiguring lesions that profoundly affect the quality of life of patients. We conclude that PDT is a new promising technology able to be topically used against CL if applied in more than one session, making it a promising ally for the management of CL.

    Palavras-Chave: protozoa; antimicrobial agents; therapy; photosensitivity

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  • IPEN-DOC 28365

    PANESI, A.R.Q. ; SILVA, R.P. ; CUNHA, E.F. ; KORKISCHKO, I. ; SANTIAGO, E.I. . Three-dimensional CFD modeling of H2/O2 HT-PEMFC based on H3PO4-doped PBI membranes. Ionics, v. 27, n. 8, p. 3461-3475, 2021. DOI: 10.1007/s11581-021-04107-9

    Abstract: A complete non-isothermal model of a HT-PEMFC setup using a PBI/ H3PO4 membrane was developed, modeled, and solved using COMSOL Multiphysics. Polarization curves were simulated and compared to the corresponding experimental data. In this work, a serpentine flow field and an active area of 5 cm2 have been implemented in a computational fluid dynamics (CFD) application. The model predicts water vapor transport, mass concentration of H3PO4, temperature, and membrane current density distribution. In this model, the anode feed is pure hydrogen, and oxygen is introduced at the cathode side. The heat transfer model was coupled with the electrochemical and mass transport; a particular heating configuration is investigated for temperature distribution, emphasizing the membrane. The models showed consistency and were used to investigate the behavior of H3PO4 concentration and all transport characteristics. The concentration of phosphoric acid decreases with increasing temperature and relative humidity and the diffusive flux of water vapor increases with the decrease of the operating voltage. Two different configurations of inlet and outlet flow channels were analyzed and the results were compared.

    Palavras-Chave: fuel cells; phosphoric acid; fluid mechanics; efficiency; computer calculations; dynamics

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  • IPEN-DOC 28364

    FONSECA, HUGO M.; SANTOS, CAMILA O.; CRUZ, LUIS P.A.; ARTHUR, VALTER ; FREITAS, BARBARA C.B.; SOUZA, ADRIANA R.M.; MARTINS, GLENDARA A.de S.. The effects of microwave application on the physicochemical properties of bacaba (Oenocarpus bacaba Mart.) oil. Acta Scientiarum Polonorum Technologia Alimentaria, v. 20, n. 2, p. 189-196, 2021. DOI: 10.17306/J.AFS.2021.0893

    Abstract: BACKGROUND Bacaba (Oenocarpus bacaba Mart.) has a high yield of oil, with the potential to produce biologically active natural products and can be considered a new "superfruit" with high value added. METHODS Acid value, peroxide value, refractive index, saponification value, p-anisidine value, relative density, iodine value, total oxidation value, specific extinction coefficients at 232 and 270 nm (K232 and K270), ΔK, and color were determined. RESULTS The most significant changes in the quality values, such as peroxide (26.25 mEq·kg-1), p-anisidine (11.41), acidity (14.66 mg KOH·g-1 oil), and total oxidation (63.92) were determined for 15 min of microwave heating. CONCLUSIONS The microwave heating promoted the acceleration of oxidative processes showing that, overall, much care should be taken when heating the bacaba oil by microwave to avoid oil degradation.

    Palavras-Chave: fruits; vegetable oils; microwave radiation; radiation effects; heating; tropical regions

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  • IPEN-DOC 28373

    VASQUEZ, P.A.S. ; NAGAI, M.L.E. . Cultural heritage preservation. In: GREENSPAN, EHUD (Ed.). Encyclopedia of nuclear energy. Amsterdam: Elsevier, 2021. p. 573-587, v. 4, DOI: 10.1016/B978-0-12-819725-7.00016-7

    Palavras-Chave: cultural objects; historical aspects; preservation; sterilization; cobalt 60; gamma radiation

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  • IPEN-DOC 28363

    RODRIGUES, PRISCILA S. ; BURIMOVA, ANASTASIA ; SALES, TATIANE S.N. ; FILHO, ARNALDO A.M. ; OTUBO, LARISSA ; SAXENA, RAJENDRA N. ; CARBONARI, ARTUR W. . The effect of Er doping on local structure of magnetite nanoparticles. Hyperfine Interactions, v. 242, n. 38, p. 1-6, 2021. DOI: 10.1007/s10751-021-01767-x

    Abstract: In this work Fe3O4:Er nanoparticles (NPs) with the characteristic size of ~ 11 nm were synthesized via classic co-precipitation method. Electron microscopy and X-ray diffraction were employed to probe the morphology and structure of the samples. Results revealed that samples synthesized in the Fd-3mZ structure with lattice constant close to that of pure magnetite. 111In probe generator was incorporated at synthesis in order to map the evolution of hyperfine magnetic field with temperature using time differential perturbed angular correlation (TDPAC) spectroscopy. The TDPAC results are discussed in terms of the effect of Er dopant on the magnetic properties and local structure of the NPs.

    Palavras-Chave: differential pac; coprecipitation; nanoparticles; magnetic properties; doped materials

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  • IPEN-DOC 28372

    PEREIRA, MARIA da C.C. ; MADI FILHO, TUFIC ; BERRETTA, JOSE R. ; TOMAZ, LUCAS F. . Characteristics of PB2+ doped CsI matrix under gamma and neutron excitations. In: HOLZMANN, HENRIQUE A. (Org.); DALLAMUTA, JOAO (Org.). Engenharias: da genialidade à profissão e seu desenvolvimento 2. Ponta Grossa, PR: Atena Editora, 2021. cap. 11. DOI: 10.22533/at.ed.246211811

    Abstract: In recent years, there has been an increasing interest in finding new fast scintillating material or improve the characteristics of known scintillatorsfor the demand of high energy physics, industrial and nuclear medical applications. Divalent lead ions Pb2+ built in some crystal structures are efficient emission centers and their applications in scintillators wereand arestill the reason of an intensive study of emission properties of different compounds containing these ions. In this context, the crystals of Pb2+ doped CsI matrix were grown by the vertical Bridgman techniqueandsubjected to annealing in vacuum of 10-6 mbar and constanttemperatureof 350°C, for 24 hours, and then they were employed. To evaluate the response of the CsI:Pb scintillator crystal to gamma radiation, radioactive sources of 137Cs (662 keV), 60Co (1173 keV and 1333 keV), 22Na (511 keV and 1275 keV) and 133Ba (355 keV) wereused. The operating voltage of the photomultiplier was 2700 V for the detection of gamma rays and the accumulation time in the counting process was 600 s. The scintillator response to neutron radiation from a radioactive source of AmBe with energy range of 1 to 12 MeV was available. The activity of the AmBe source was 1 Ci Am. The emission ratewas 2.2x 106 neutrons/ second. The operating voltage of the photomultiplier tube was 1300 V. The accumulation time in the counting process was 600 s. With the results obtained, it may be observed that the crystals are sensitive to these radiations.

    Palavras-Chave: annealing; barium 122; bridgman method; cesium 137; cesium iodides; cobalt 60; crystals; doped materials; lead; luminescence; scintillations; sodium 22

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  • IPEN-DOC 28371

    BONATTO, A.; MALDONADO, E.P.; NUNES, R.P.; ZUFFI, A.V.F. ; TABACOW, F.B.D. ; SAMAD, R.E. ; VIEIRA JUNIOR, N.D. . On the development of a low peak-power, high repetition-rate laser plasma accelerator at IPEN. In: INTERNATIONAL PARTICLE ACCELERATOR CONFERENCE, 12th, May 24-28, 2021, Campinas, SP. Proceedings... Geneva, Switzerland: JACoW Publishing, 2021. DOI: 10.18429/JACoW-IPAC2021-TUPAB141

    Abstract: In this work, the current status on the development of a laser plasma accelerator at the Nuclear and Energy Research Institute (Instituto de Pesquisas Nucleares e Energéticas, IPEN/CNEN), in São Paulo, Brazil, is presented. Short pulses to be produced by an under-development near-TW, kHz laser system will be used to ionize a gas jet, with a density profile designed to optimize the self-injection of plasma electrons. The same laser pulse will also drive a plasma wakefield, which will allow for electron acceleration in the self-modulated regime. The current milestone is to develop the experimental setup, including electron beam and plasma diagnostics, required to produce electron bunches with energies of a few MeV. Once this has been achieved, the next milestone is to produce beams with energies higher than 50 MeV. Besides kickstarting the laser wakefield accelerator (LWFA) technology in Brazil, this project aims to pave the way for conducting research on the production of radioisotopes by photonuclear reactions, triggered by LWFA accelerated beams.

    Palavras-Chave: lasers; plasma; wakefield accelerators; particles

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  • IPEN-DOC 28362

    NUNES, PAULO S.G.; SILVA, GABRIEL da; NASCIMENTO, SOFIA ; MANTOANI, SUSIMAIRE P.; ANDRADE, PETERSON de; BERNARDES, EMERSON S. ; KAWANO, DANIEL F.; LEOPOLDINO, ANDREIA M.; CARVALHO, IVONE. Synthesis, biological evaluation and molecular docking studies of novel 1,2,3-triazole-quinazolines as antiproliferative agents displaying ERK inhibitory activity. Bioorganic Chemistry, v. 113, p. 1-12, 2021. DOI: 10.1016/j.bioorg.2021.104982

    Abstract: ERK1/2 inhibitors have attracted special attention concerning the ability of circumventing cases of innate or log-term acquired resistance to RAF and MEK kinase inhibitors. Based on the 4-aminoquinazoline pharmacophore of kinases, herein we describe the synthesis of 4-aminoquinazoline derivatives bearing a 1,2,3-triazole stable core to bridge different aromatic and heterocyclic rings using copper-catalysed azide-alkyne cycloaddition reaction (CuAAC) as a Click Chemistry strategy. The initial screening of twelve derivatives in tumoral cells (CAL-27, HN13, HGC-27, and BT-20) revealed that the most active in BT-20 cells (25a, IC50 24.6 μM and a SI of 3.25) contains a more polar side chain (sulfone). Furthermore, compound 25a promoted a significant release of lactate dehydrogenase (LDH), suggesting the induction of cell death by necrosis. In addition, this compound induced G0/G1 stalling in BT-20 cells, which was accompanied by a decrease in the S phase. Western blot analysis of the levels of p-STAT3, p-ERK, PARP, p53 and cleaved caspase-3 revealed p-ERK1/2 and p-STA3 were drastically decreased in BT-20 cells under 25a incubation, suggesting the involvement of these two kinases in the mechanisms underlying 25a-induced cell cycle arrest, besides loss of proliferation and viability of the breast cancer cell. Molecular docking simulations using the ERK-ulixertinib crystallographic complex showed compound 25a could potentially compete with ATP for binding to ERK in a slightly higher affinity than the reference ERK1/2 inhibitor. Further in silico analyses showed comparable toxicity and pharmacokinetic profiles for compound 25a in relation to ulixertinib.

    Palavras-Chave: phosphotransferases; chemistry; enzyme inhibitors; tumor cells; hexokinase

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  • IPEN-DOC 28361

    BRAGUIN, L.N.M. ; SILVA, C.A.J. da ; BERBEL, L.O. ; VIVEIROS, B.V.G. de ; ROSSI, J.L. ; COSTA, I. ; SAIKI, M. . A study on corrosion resistance of ISO 5832-1 austenitic stainless steel used as orthopedic implant. International Journal of Advances In Medical Biotechnology, v. 3, n. 2, p. 23-28, 2020. DOI: 10.25061/ijamb.v3i2.83

    Abstract: The ISO 5832-1 austenitic stainless steel used as biomaterial is largely applied in the area of orthopedics, especially in the manufacture of implants, such as temporary or permanent replacement of bone structures. The objective of this study was to evaluate the localized corrosion resistance of the ISO 5832-1 stainless steel used in orthopedic implants by electrochemical tests in two different solutions. The results of this study are of great interest to evaluate the corrosion of metallic implants that can result in the release of corrosion products into bodily fluids causing possible adverse biological reactions. The determination of the chemical elements in the composition of the ISO 5832-1 stainless steel was performed by neutron activation analysis (NAA). The samples for electrochemical tests were grinded with silicon carbide paper up to #4000 finishing, followed by mechanical polishing with diamond paste. The open circuit potential measurements and anodic polarization curves were obtained in solution of 0.90 wt. % of NaCl and of simulated body fluid (SBF). The results indicated that the ISO 5832-1 stainless steel presented a high resistance to crevice corrosion in simulated body fluid solution but high susceptibility to this form of corrosion in the chloride solution.

    Palavras-Chave: austenitic steels; implants; metals; stainless steels; corrosion resistance

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  • IPEN-DOC 28370

    PEREIRA, NILSON C. ; MACHADO, MIRIAM L.C.; SILVA, LEONARDO G. de A. e ; CASARIN, SUZAN A.; PEREIRA, CÍCERA S.. Evaluation of the thermal properties of low density polyethylene composites with bamboo fibers (pebd /bamboo fibers composites) by differential scanning calorimetry (DSC) and thermogravimetric analysis. In: BRAZILIAN POLYMER CONFERENCE,16th, October 24-28, 2021, Ouro Preto-MG, Online. Proceedings... Rio de Janeiro: Sociedade Brasileira de Metrologia, 2021.

    Abstract: Considering the necessity of the development of environmentally sustainable materials and processes and the occurrence of a great diversity of bamboo species in Brazil, and the same still little used by western society, the objective of this work was to prepare and process LDPE (Low Density Polyethylene) / Bamboo fibers, evaluating the thermal and mechanical properties of the obtained composites. Composites containing 10.0, 20.0, and 30.0 wt.% of bamboo fibers were processed. The composites were characterized by thermal tests of Differential Exploration Calorimetry (DSC) and Thermogravimetry (TGA). The results of the thermal characterization showed that the obtained composites showed modifications of properties, in relation to the polymer matrix (LDPE). The work showed that it is feasible the use of bamboo fibers in composites involving thermoplastic polymer matrix and lignocellulosic fibers. The composites obtained will have applications in packages processed by thermoforming.

    Palavras-Chave: density; polyethylenes; composite materials; polymers; calorimetry

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  • IPEN-DOC 28369

    ALMEIDA, S.B. ; TAVARES, P.V.S. ; CAMPOS, L.L. . Evaluation of the impacts caused by the "warp" effect on 3D printed phantoms for clinical application of photon beams. In: CONGRESSO BRASILEIRO DE METROLOGIA, 11; CONGRESSO BRASILEIRO DE METROLOGIA DAS RADIAÇÕES IONIZANTES, 8, 18-21 de outubro, 2021, Online. Anais... Rio de Janeiro: Sociedade Brasileira de Metrologia, 2021.

    Abstract: This work aims to evaluate the impact of the warp effect on printed phantoms with tissue equivalence to be used in radiotherapy. The “warp” effect is caused by several parameters that directly interfere in the printing process. The “warp” effect causes a warping or slanting of the outer edges of the parts being printed, this occurs when there is no adherence of the part to the printer platform. The tendency to distort a printed object to simulate a patient is great because the warp effect occurs due to the way the objects will be printed, especially if they are to be printed in successive layers. Despite the difficulties of printing the phantoms with tissue equivalence for clinical application with 100% filling, it is possible to use this technology to simulate a patient and obtain advantageously a phantom for clinical photon beam dosimetry.

    Palavras-Chave: photon beams; phantoms; 3d printing; deformation; tissue-equivalent materials

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  • IPEN-DOC 28360

    SILVA, CAIO A.J. da ; BRAGUIN, LILIAN N.M. ; BERBEL, LARISSA O. ; VIVEIROS, BARBARA V.G. ; ROSSI, J.L. ; SAIKI, M. ; COSTA, I. . Study of ph effect on AZ31 magnesium alloy corrosion for using in temporary implants. International Journal of Advances In Medical Biotechnology, v. 3, n. 2, p. 15-22, 2020. DOI: 10.52466/ijamb.v3i2.72

    Abstract: Currently, magnesium alloys are gaining great interest for medical applications due to their degrading properties in the human body ensuring a great biocompatibility. These alloys also provide profitable mechanical properties due similarities with human bone. However, a difficulty in applying these materials in the biomaterials industries is the corrosion prior to cell healing. The effect of the chemical composition of Mg alloys on their corrosion behavior is well known. In this study, samples of AZ31 magnesium alloy were cut into chips for elemental chemical analysis by neutron activation analysis (NAA). Concentrations of the elements As, La, Mg, Mn, Na, Sb and Zn were determined in the AZ31 alloy. Visualization tests of agar corrosion development in various media, of 0.90% sodium chloride solution (mass), phosphate buffer saline (PBS) and simulated body fluid (SBF) were performed. Visualizations of the effect of agar gel corrosion revealed pH variation during the corrosion process due to the released into the cathode. The highest released of hydroxyl ions occurred in NaCl solution compared to PBS and SBF solutions indicating that NaCl solution was much more aggressive to the alloy compared to the others.

    Palavras-Chave: magnesium alloys; implants; corrosion; neutron activation analysis; sodium chlorides; chemical analysis

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  • IPEN-DOC 28368

    CASTRO, DIONE P. de ; SILVA, LEONARDO G. de A. e . Characterization of TPS/PBAT blends irradiated by ionizing radiation. In: BRAZILIAN POLYMER CONFERENCE,16th, October 24-28, 2021, Ouro Preto-MG, Online. Proceedings... São Carlos, SP: Associação Brasileira de Polímeros, 2021.

    Abstract: The use of biodegradable polymers is an important alternative today for both the environment and industry. However, when compared to conventional polymers, biodegradables are more expensive. The development of polymeric blends using matrices of biodegradable and synthetic polymers with natural additives are less damaging to the environment and more cost efficient. This study aimed to prepare natural blends of thermoplastic starch (TPS) with poly(butylene adipate-co-terephthalate) (PBAT) by reactive extrusion. The blends were submitted to the irradiation process using a Cobalt-60 source at a 25 kGy dose and then characterized by Fourier-transform infrared spectroscopy (FTIR) and differential heat flow scanning calorimetry (DSC). According to the results obtained in the FTIR tests, the blends did not undergo chemical changes during the irradiation process and, thus, maintained their properties. In the DSC tests, it was observed that the blends F2 (composed of castor oil) and F3 (composed of castor oil and TWEEN® 80) showed higher values of heat flow for degradation than the samples F0 (composed of glycerol) and F1 (composed of glycerol and TWEEN® 80), probably due to the chemical interaction of castor oil and its constituents. There was no thermal variation in the irradiation process between blends F0 and F1 or F2 and F3 . It was concluded that it is feasible to replace castor oil with glycerol in TPS/PBAT blends.

    Palavras-Chave: biodegradation; polymers; irradiation; environment; ionizing radiations

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  • IPEN-DOC 28359

    FRANCISCO, LEONARDO H.C. ; MOREIRA, RENAN P. ; FELINTO, MARIA C.F.C. ; TEIXEIRA, VERONICA C.; BRITO, HERMI F.; MALTA, OSCAR F.. SrAl2O4: Eu2+, Dy3+ persistent luminescent materials functionalized with the Eu3+(TTA)-complex by microwave-assisted method. Journal of Alloys and Compounds, v. 882, p. 1-12, 2021. DOI: 10.1016/j.jallcom.2021.160608

    Abstract: Recently, several classes of rare-earth-doped luminescent materials have been drawing attention due to structurally engineered energy converting systems, capable of tuning absorption and emission spectral ranges, outlining new materials and applications in photonics. In this scenario, this work presents the development of SrAl2O4:Eu2+,Dy3+ phosphors prepared by the Pechini method, which were further APTMS-functionalized (3-aminopropyltrimethoxysilane) by microwave-assisted synthesis, incorporating a Eu3+ β-diketonate complex embedded within a SiO2-R network to increase light absorption and promote energy transfer processes. Powder X-ray diffraction data revealed a stable characteristic monoclinic phase of the SrAl2O4 host matrix, which undergoes structural changes after functionalization. Particle morphology and elemental distribution were probed by scanning electron microscopy technique, exhibiting surface alteration effects. Photoluminescence spectra displayed a characteristic broad green emission band assigned to the 4f65d1(2D) → 4f7(8S7/2) interconfigurational transition of the Eu2+ ion. Functionalized materials presented absorption shifts coupled with an emission band intensification suggesting effective interactions between the β-diketonate complex, the SiO2-R network, and the inorganic host matrix. Increased absorption range and persistence decay time under near band gap excitation on modified materials were also observed.

    Palavras-Chave: rare earths; strontium; aluminates; ketones; luminescence

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  • IPEN-DOC 28307

    CAMARGO, C.A.D. ; CAMPOS, ALEX da C. ; BERUSKIB, O.; LOPES, T. . Catalysts containing transition metals on nitrogen and carbon structures for hydrogen production through saltwater electrolysis. In: ECS MEETING, 239th; INTERNATIONAL MEETING ON CHEMICAL SENSORS, 18th, May 30 - June 3, 2021, Online. Proceedings... Chicago, USA: The Electrochemical Society, 2021.

    Abstract: When hydrogen is produced by electrolysis the possibility of water stress in some populations and scarcity of precious metals for catalyst production are seen as future barriers. The use of non-precious metal catalysts allied to direct saltwater splitting reduce the pressure on scarce resources. Here, four Metal-Nitrogen-Carbon (M-N-C) catalysts were synthesized with metal salts of Co, Fe, Ni and FeNi, with 1,5-diaminonhaptalene as N-C source. These catalysts were compared with a blank N-C without metal and a Pt/C commercial catalyst. Tests were conducted in electrolyte solution 0.5 M of H2SO4 and 0.5 M of NaCl. Results showed limited activity towards Hydrogen Evolution Reaction (HER) compared with Pt/C and other non-precious metal catalysts. Nevertheless, points out trends for better catalyst synthesis as improved activity of FeNi catalyst in acidic media and saltwater.

    Palavras-Chave: catalysts; transition elements; hydrogen; electrochemical cells; carbon

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  • IPEN-DOC 28358

    BISPO, FABIO H.A.; MENEZES, MICHELE D. de; FONTANA, ADEMIR; SARKIS, JORGE E. de S. ; GONCALVES, CRISTIANO M.; CARVALHO, TEOTONIO S. de; CURI, NILTON; GUILHERME, LUIZ R.G.. Rare earth elements (REEs): geochemical patterns and contamination aspects in Brazilian benchmark soils. Environmental Pollution, v. 286, p. 1-12, 2021. DOI: 10.1016/j.envpol.2021.117972

    Abstract: Rare earth elements have been increasingly used in modern societies and soils are likely to be the final destination of several REE-containing (by)products. This study reports REE contents for topsoils (0–20 cm) of 175 locations in reference (n = 68) and cultivated (n = 107) areas in Brazil. Benchmark soil samples were selected accomplishing a variety of environmental conditions, aiming to: i) establishing natural background and anthropogenic concentrations for REE in soils; ii) assessing potential contamination of soils - via application of phosphate fertilizers - with REE; and, iii) predicting soil-REE contents using biomes, soil type, parent material, land use, sand content, and biomes-land use interaction as forecaster variables through generalized least squares multiple regression. Our hypotheses were that the variability of soil-REE contents is influenced by parent material, pedogenic processes, land use, and biomes, as well as that cultivated soils may have been potentially contaminated with REE via input of phosphate fertilizers. The semi-total concentrations of REE were assessed by inductively coupled plasma mass spectrometry (ICP-MS) succeeding a microwave-assisted aqua regia digestion. Analytical procedures followed a rigorous QA/QC protocol. Soil physicochemical composition and total oxides were also determined. Natural background and anthropogenic concentrations for REE were established statistically from the dataset by the median plus two median absolute deviations method. Contamination aspects were assessed by REE-normalized patterns, REE fractionation indices, and Ce and Eu anomalies ratios, as well as enrichment factors. The results indicate that differences in the amounts of REE in cultivated soils can be attributed to land use and agricultural sources (e.g., phosphate-fertilizer inputs), while those in reference soils can be attributed to parent materials, biomes, and pedogenic processes. The biomes, land use, and sand content helped to predict concentrations of light REE in Brazilian soils, with parent material being also of special relevance to predict heavy REE contents in particular.

    Palavras-Chave: rare earths; environment; geochemistry; tropical regions; soils; surface contamination; anthropocene

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  • IPEN-DOC 28357

    SILVA, CAMILA R. ; SALVEGO, CAMILA de A. ; ROSTELATO, MARIA E. ; ZEITUNI, CARLOS A. ; RIBEIRO, MARTHA S. . Photobiomodulation therapy combined with radiotherapy in the treatment of triple-negative breast cancer-bearing mice. Journal of Photochemistry and Photobiology B: Biology, v. 220, p. 1-9, 2021. DOI: 10.1016/j.jphotobiol.2021.112215

    Abstract: This work investigated the effect of photobiomodulation therapy (PBM) combined with radiotherapy (RT) on triple-negative breast cancer (TNBC)-bearing mice. Female BALB/c mice received 4 T1 cells into a mammary fat pad. Local RT was performed with a total dose of 60 Gy divided into 4 consecutive sessions of 15 Gy. For PBM, a red laser was used in three different protocols: i-) single exposure delivering 150 J.cm−2 (24 h after the last RT session), and ii-) radiant exposure of 150 J.cm−2 or iii-) fractionated radiant exposure of 37.5 J.cm−2 (after each RT session). Tumor volume, complete blood cell count, clinical condition, metastasis, and survival of animals were monitored during 3 weeks post-RT. Our results demonstrated that regardless of the protocol, PBM arrested the tumor growth, improved the clinical condition, and prevented hemolytic anemia. Besides, although PBM groups have exhibited a high neutrophil:lymphocyte ratio (NLR), they decreased the number of lung metastases and enhanced mouse survival. Worthy of note, PBM should be used along with the RT sessions in higher radiant exposures, since PBM at 150 J.cm−2 per session significantly extended the survival rate. Together, these data suggest PBM could be a potential ally to RT to fight TNBC.

    Palavras-Chave: laser radiation; modulation; therapy; neoplasms; mammary glands; blood count; infrared radiation

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  • IPEN-DOC 28356

    MIZUTANI, G. ; BUSTILLOS, O. . Pesticides analysis in beans by gas chromatography couplet with tandem mass spectrometry. Annals of Agricultural & Crop Sciences, v. 6, n. 4, p. 1-7, 2021. DOI: 10.26420/annagriccropsci.2021.1082

    Abstract: Beans are part of the basic diet alimentation for Brazilian population, as they gather proteins, carbohydrates, vitamins, mineral salts, fibers, amino acids and essential nutrients such as iron and calcium, being a complete food that can be compared with the amount of protein that the meat has. Considering the beans world production, in development countries represent almost 50%, being that Myanmar, India and Brazil the top three position. The use of pesticides is widely spread in these countries to reduce agricultural losses due to pests that interfere with grain production. Therefore the risk that could be generated from foods pesticides residues makes their analyses of quantification mandatory. The purpose of this work was to develop an analytical method to quantitatively characterize fungicides pesticides residues, flutriafol, procymidone and tebuconazole that were used to angular spot control, anthracnose, rust and alternaria spot, white mold fungi, present in beans, by means of gas chromatography coupled with a triple quadrupole mass spectrometer. Samples of beans, Phaseolus vulgaris L, types white, black, string and Vigna angularis, type adzuki, had been bought in grains store and supermarkets at metropolitan São Paulo city. The validation of analytical method was explored for sensitivity, selectivity, precision. The extraction procedure was performed in two different forms, QuEChERS, and solid-liquid extraction with low temperature. Through this methodology, reached below the maximum limit allowed by Brazilian law 0.5mgkg-1 for procymidone and 0.1mgkg-1 for flutriafol and tebuconazole. Several samples of four types of beans were tested and all of them had procymidone identified and 7% of samples higher than the law limit.

    Palavras-Chave: pesticides; agriculture; beans; gas chromatography; quantitative chemical analysis

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  • IPEN-DOC 28355

    RIBEIRO, DANIEL V.; AMORIM JUNIOR, NILSON S.; ANDRADE NETO, JOSE S.; ALBUQUERQUE, DIANA D.M.; MAZZILLI, BARBARA P. . Performance and radiological implications of using residue from TiO2 production as a component of coating mortars. Construction and Building Materials, v. 306, p. 1-12, 2021. DOI: 10.1016/j.conbuildmat.2021.124885

    Abstract: The objective of this study was to investigate the effect of the addition of residue from the production of TiO2, namely, unreacted ore waste (UOW), on the properties of coating mortars as well as evaluate its radiological impact. The properties of the mixed cement lime mortars were evaluated after the addition of 5%, 10%, and 15% of UOW, in relation to the cement mass, with respect to the reference mortar. The coating mortars were evaluated for rheology, dynamic elastic modulus, and mechanical strength. Tests in the applied state were performed using panels. From the point of view of radiological protection, the concentration of natural radionuclides in the residue, components of the mortar, and ready mortar were determined. In addition, the concentration of radon in the air and the exposure of dwellers living in a standard room coated with mortar were evaluated. The results obtained indicated that UOW did not compromise the use of coating mortars, presenting no significant effect on the properties of fresh, hardened, and applied states. Although the UOW presented high concentration of radionuclides, mortars with 5%, 10%, and 15% of UOW led to a gamma exposition and indoor radon concentration (average values of 0.20 mSv.a-1 and 71 Bq.m−3, respectively) below the recommended limits (1 mSv.a-1 and 100 Bq.m−3). Thus, it is concluded that UOW can be incorporated into coating mortars without presenting risks to the health of users due to radiation exposure.

    Palavras-Chave: building materials; mortars; ore concentrates; titanium oxides

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  • IPEN-DOC 28354

    CABRAL, FERNANDA V. ; LIAN, CHENG; PERSHEYEV, SAYDULLA; SMITH, TERRY K.; RIBEIRO, MARTHA S. ; SAMUEL, IFOR D.W.. Organic light-emitting diodes as an innovative approach for treating cutaneous leishmaniasis. Advanced Materials Technologies, v. 6, n. 11, p. 1-9, 2021. DOI: 10.1002/admt.202100395

    Abstract: Antimicrobial photodynamic therapy (APDT) has been studied as a noninvasive therapy for treating cutaneous leishmaniasis to overcome challenges with current treatment, such as toxicity, resistance, and need for in-patient hospital treatment. Organic light-emitting diodes (OLEDs) have emerged as an attractive technology that can provide wearable light-emitting materials that are conformable to human skin. This makes OLEDs ideal candidates for APDT by light-bandages for ambulatory care. In this work, suitable OLEDs are successfully developed to match the absorbance of three photosensitizers: methylene blue, new methylene blue, and 1,9-dimethyl-methylene blue to inactivate two Leishmania species in vitro: Leishmania major and Leishmania amazonensis. Parasites are treated either by LED (20 mW cm−2) or OLED (6.5 mW cm−2) at increasing photosensitizer concentrations at a radiant exposure of 50 J cm−2. 1,9-Dimethyl-methylene blue is the most potent photosensitizer, killing both strains at nanomolar concentrations. The effect of different intensities from the OLEDs (0.7, 1.5, and 6.5 mW cm−2) are also explored and it is shown that effective killing of Leishmania occurs even at a very low intensity. These findings demonstrate the great potential of OLEDs as a new approach for ambulatory treatment of cutaneous leishmaniasis by APDT.

    Palavras-Chave: antibiotics; antimicrobial agents; light emitting diodes; organic compounds; parasites; photosensitivity

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  • IPEN-DOC 28306

    PALADINO, PATRICIA A. ; BIATY, FLAVIA P. ; JULIAO, ARTHUR P.; SABUNDJIAN, GAIANE . PLATAGAM: a video game structured as a didactical material for divulgation of some of the benefits of the gamma radiation produced in the Cobalt 60 multipurpose irradiator at IPEN’s facilities. In: INTERNATIONAL NUCLEAR ATLANTIC CONFERENCE, November 29 - December 2, 2021, Online. Proceedings... Rio de Janeiro: Associação Brasileira de Energia Nuclear, 2021.

    Palavras-Chave: gamma radiation; cobalt 60; computers; programming; irradiation

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  • IPEN-DOC 28305

    TAVARES, R.L.A.; LEMOS, F.L. ; SILVA, A.T. . Computer security on Brazilian nuclear facilities: challenges, actions and the path forward. In: INTERNATIONAL NUCLEAR ATLANTIC CONFERENCE, November 29 - December 2, 2021, Online. Proceedings... Rio de Janeiro: Associação Brasileira de Energia Nuclear, 2021.

    Palavras-Chave: nuclear facilities; computers; nuclear security

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  • IPEN-DOC 28353

    GONCALVES, SILAS A.; CANAZZA, SAMUEL A.; COSTA, FABIO E. da ; HAMADA, MARGARIDA M. . Obtenção e análise de espectros de energia para detectores de radiação com osciloscópio digital e software tipo planilha eletrônica / Obtaining and analysis of the energy spectra for radiation detectors with digital oscilloscope and worksheet software. Brazilian Journal of Development, v. 7, n. 9, p. 91027-91040, 2021. DOI: 10.34117/bjdv7n9-319

    Abstract: Detectores de radiação que produzem um pulso, cuja amplitude é proporcional a energia da radiação incidente, permitem com auxílio de uma eletrônica apropriada e de um analisador multicanal, a obtenção do espectro de energia da radiação incidente sobre o detector. Devido ao analisador multicanal nem sempre estar disponível em laboratórios, este trabalho propõe uma alternativa de medida do espectro utilizando-se dos recursos disponíveis nos osciloscópios digitais de efetuar a medida da amplitude dos pulsos e enviar a um computador tipo PC. No computador, uma planilha eletrônica adequadamente configurada pode então trabalhar os dados coletados no osciloscópio e obter o espectro de energia. Adicionalmente, um segundo recurso permite a seleção temporal da largura do pulso que minimiza leituras incorretas da amplitude na eventualidade de ocorrer empilhamento de pulsos. Para os experimentos foram utilizados um osciloscópio Tektronix TDS 30302B e a planilha eletrônica Excel®. Os espectros foram comparados com os obtidos com um analisador multicanal e se mostraram iguais ou melhores, mas que tiveram como limitação a baixa taxa de aquisição do osciloscópio que foi da ordem de apenas 2 pulsos/seg, portanto milhares de vezes menor que de um analisador multicanal.

    Palavras-Chave: energy spectra; oscillographs; digital systems; multi-channel analyzers; radiation detectors

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  • IPEN-DOC 28304

    ALMEIDA, MADISON C. de; PAIXAO, CLAUDIA M. ; ARQUINTO, JULIANA ; KOTANI, PALOMA O. ; MARINHO, THAYNA C. ; ALONSO, VANESSA M. ; ANDRADE, DELVONEI A. de . Very High Temperature Reactor (VHTR): a proposal to generation IV Reactors. In: INTERNATIONAL NUCLEAR ATLANTIC CONFERENCE, November 29 - December 2, 2021, Online. Proceedings... Rio de Janeiro: Associação Brasileira de Energia Nuclear, 2021.

    Palavras-Chave: htgr type reactors; power generation; hydrogen production; nuclear energy; thermal reactors

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  • IPEN-DOC 28352

    VERDE, MARIA E.Q.L.; FERREIRA-JUNIOR, ANTONIO E.C.; BARROS-SILVA, PAULO G. de; MIGUEL, EMILIO de C.; MATHOR, MONICA B. ; LIMA-JUNIOR, EDMAR M.; MORAES-FILHO, MANOEL O. de; ALVES, ANA P.N.N.. Nile tilapia skin (Oreochromis niloticus) for burn treatment: ultrastructural analysis and quantitative assessment of collagen. Acta Histochemica, v. 123, n. 6, p. 1-8, 2021. DOI: 10.1016/j.acthis.2021.151762

    Abstract: Nile tilapia (Oreochromis niloticus) skin is a well-known biomaterial used as an occlusive dressing for burn treatment. It is also an inexpensive and important source of collagen. This study aims to describe the ultrastructural aspects of Nile tilapia skin, assess its collagen amount and organization, and compare quantitative methods of histochemical and immunohistochemical analysis (in all sterilization steps for use in burn dressings). One sample (0.5 x 0.5 cm) of ten different fish skins was divided in four groups: in natura skin (IN), chemical sterilization (CH), additional irradiation (30 kGy) (IR), and skins used in burn treatment (BT) to compare histochemical and immunohistochemical findings of collagen amount and describe ultrastructural aspects through scanning electron microscopy. The amount of type I collagen decreased during sterilization and clinical use owing to gradual reduction of immunostaining (anti-collagen-I) and decreasing fiber thickness of the collagen, when compared to type III (Picrosirius-red-polarized light). The collagen fibers were rearranged at each sterilization step, with a low collagen percentage and large structural disorganization in BT. The amount of type-I collagen was further reduced after BT (p < 0.05). Both the methods did not exhibit a quantified value difference (p = 0.247), and a positive correlation (r = 0.927; 95 % CI = 0.720–0.983) was observed between them, with concordance for collagen quantification in similar samples, presenting a low systematic error rate (Dalberg coefficient: 6.70). A significant amount of type-I collagen is still observed despite sterilization, although clinical application further reduces type I collagen. Its quantification can be performed both by immunohistochemistry and/or Picrosirius Red reliably.

    Palavras-Chave: burns; therapy; animal tissues; collagen; fishes; biological materials

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  • IPEN-DOC 28303

    BORSOI, S.S.; BARONI, D.B.; MATTAR NETO, M. ; OLIVEIRA, P.S.P. ; MATURANA, M.C.. Risk-based design of electric power systems for non-conventional nuclear facilities at shutdown modes. In: INTERNATIONAL NUCLEAR ATLANTIC CONFERENCE, November 29 - December 2, 2021, Online. Proceedings... Rio de Janeiro: Associação Brasileira de Energia Nuclear, 2021.

    Palavras-Chave: electric power; power systems; radiation protection; security; safety; reactor shutdown

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  • IPEN-DOC 28302

    SILVA, T.P. da; MATURANA, M.C.; MATTAR NETO, M. ; OLIVEIRA, P.S.P. de . External Events PSA: requirements applicable to new nuclear installations projects. In: INTERNATIONAL NUCLEAR ATLANTIC CONFERENCE, November 29 - December 2, 2021, Online. Proceedings... Rio de Janeiro: Associação Brasileira de Energia Nuclear, 2021.

    Palavras-Chave: nuclear facilities; hazards; safety analysis; risk assessment

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  • IPEN-DOC 28301

    GAETA, N.C.; CARVALHO, D.U.O.G.; ALEMAN, M.A.R.; CARVALHO, J.S.; CEDRAZ, P.P.; ULRICH, J.C. ; JOVANE, L.; GREGORY, L.; SCAPIN, M.A. . Quantitative analysis of minor and trace elements in blood serum of dairy cattle (Bos taurus) by WDXRF. In: INTERNATIONAL NUCLEAR ATLANTIC CONFERENCE, November 29 - December 2, 2021, Online. Proceedings... Rio de Janeiro: Associação Brasileira de Energia Nuclear, 2021.

    Palavras-Chave: absorption spectroscopy; blood serum; cattle; elements; icp mass spectroscopy; trace amounts; veterinary medicine; x-ray fluorescence analysis

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  • IPEN-DOC 28300

    SANTOS, R.F. dos; SERRA FILHO, L.A.; MUNHOZ., M.G.; BREGANT, M.; MORALLES, M. ; SOUZA, F.A. . Performance and optimization of a GEM-based neutron detector using a parameterized fast simulator. In: INTERNATIONAL NUCLEAR ATLANTIC CONFERENCE, November 29 - December 2, 2021, Online. Proceedings... Rio de Janeiro: Associação Brasileira de Energia Nuclear, 2021.

    Palavras-Chave: computer codes; computerized simulation; electron multiplier detectors; gases; he-3 counters; neutron detectors; nuclear reactions; radiation detectors; thermal neutrons

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  • IPEN-DOC 28351

    SILVA, JOSE T. ; SOUZA, CARLA D. de ; ANGELOCCI, LUCAS V. ; ROSERO, WILMMER A.A. ; NOGUEIRA, BEATRIZ R. ; CORREIA, RUANYTO W. ; ZEITUNI, CARLOS A. ; ROSTELATO, MARIA E.C.M. . New model for an epoxy-based brachytherapy source to be used in spinal cancer treatment. Applied Radiation and Isotopes, v. 178, p. 1-7, 2021. DOI: 10.1016/j.apradiso.2021.109952

    Abstract: The present work described the cold fabrication of a P-32 radioactive source to be used in CNS cancer using epoxy resin. The epoxy plaque fabricated with Teflon mold presented better agreement. MCNP simulation evaluated the radiation dose. Special attention was given to factors that can impact dose distribution. Average dose was 16.44 ± 2.89% cGy/s. Differences of less than 0.01 cm in thickness within the plaque lead to differences of up to 12% in the dose rate.

    Palavras-Chave: epoxides; brachytherapy; neoplasms; central nervous system; monte carlo method; radiation doses

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  • IPEN-DOC 28299

    ALVES, J.P.S. ; M.FILHO, T. ; PEREIRA, M.C.C. . Growth of scintillating bromide-doped cesium iodide crystals for radiation detection. In: INTERNATIONAL NUCLEAR ATLANTIC CONFERENCE, November 29 - December 2, 2021, Online. Proceedings... Rio de Janeiro: Associação Brasileira de Energia Nuclear, 2021.

    Palavras-Chave: bridgman method; bromine; crystal doping; crystal growth; crystals; radiation detection; radiation detectors; radiation protection

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  • IPEN-DOC 28298

    SOUZA, DAIANE C.B.; VICENTE, ROBERTO ; SA, LIDIA V. de; SILVA, EDILANE H.; OLIVEIRA, MARCUS V.L.; CIDRAL, MARIA E.V.; CAMILO, NAYTHYARA F.; FARIA, CAMILA R.. Dose estimation in abdominal CT scans from DICOM header data. In: INTERNATIONAL NUCLEAR ATLANTIC CONFERENCE, November 29 - December 2, 2021, Online. Proceedings... Rio de Janeiro: Associação Brasileira de Energia Nuclear, 2021.

    Palavras-Chave: abdomen; computerized tomography; contrast media; dose rates; effective radiation doses; images; monte carlo method; phantoms; radiation doses

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  • IPEN-DOC 28297

    SUZART, K.F. ; PEREIRA, M.C.C. ; HAMADA, M.M. ; MESQUITA, C.H. . Zonal refining and Bridgman technique for CsI:Tl scintillation crystal growth. In: INTERNATIONAL NUCLEAR ATLANTIC CONFERENCE, November 29 - December 2, 2021, Online. Proceedings... Rio de Janeiro: Associação Brasileira de Energia Nuclear, 2021.

    Palavras-Chave: bridgman method; cesium iodides; crystal growth; doped materials; purification; radiation detectors; salts; scintillation counters; thallium

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  • IPEN-DOC 28296

    MASTRO, N.L. del ; GERVASONI, J.L.. Women in the nuclear field promoting Latin American integration. In: INTERNATIONAL NUCLEAR ATLANTIC CONFERENCE, November 29 - December 2, 2021, Online. Proceedings... Rio de Janeiro: Associação Brasileira de Energia Nuclear, 2021.

    Palavras-Chave: documentation; information retrieval; information systems; nuclear energy; reactor technology; women

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  • IPEN-DOC 28295

    AGUIAR, A.S. ; LEE, S.M. ; SABUNDJIAN, G. . Whole body dose due to station blackout at Angra 2 nuclear power plant. In: INTERNATIONAL NUCLEAR ATLANTIC CONFERENCE, November 29 - December 2, 2021, Online. Proceedings... Rio de Janeiro: Associação Brasileira de Energia Nuclear, 2021.

    Palavras-Chave: absorbed radiation doses; dispersions; ecological concentration; emergency plans; mathematical models; plumes; radionuclide migration; reactor shutdown

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  • IPEN-DOC 28294

    BARBOSA, THALITA A.C.; BIATY, FLÁVIA P.; PALADINO, PATRICIA A.; JULIÃO, ARTHUR P.; SABUNDJIAN, GAIANE . Visita virtual ao CETER - Centro de Tecnologia das Radiações - Instituto de Pesquisas Energéticas e Nucleares. In: INTERNATIONAL NUCLEAR ATLANTIC CONFERENCE, November 29 - December 2, 2021, Online. Proceedings... Rio de Janeiro: Associação Brasileira de Energia Nuclear, 2021.

    Palavras-Chave: artificial intelligence; digital systems; man-machine systems; mobile phones; nuclear facilities; technology utilization

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  • IPEN-DOC 28293

    ISHIMARU, G. ; SAIKI, M. . Use of tipuana tipu tree barks in active biomonitoring of atmospheric pollutants. In: INTERNATIONAL NUCLEAR ATLANTIC CONFERENCE, November 29 - December 2, 2021, Online. Proceedings... Rio de Janeiro: Associação Brasileira de Energia Nuclear, 2021.

    Palavras-Chave: air pollution monitoring; elements; monitoring; pollutants; pollution control; radioecological concentration; trees

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  • IPEN-DOC 28350

    SILVA, B.C.; CURY, L.A.; LEAL, A.S.; MENEZES, M.A.B.C.; NAGORNY, S.; NISI, St.; SAIKI, M. ; JACIMOVIC, R.; KRAMBROCK, K.. Neutron-induced point defects and luminescence properties of enriched Zn82Se crystals. Journal of Applied Physics, v. 130, n. 5, p. 1-11, 2021. DOI: 10.1063/5.0052503

    Abstract: Enriched Zn82Se is a very promising material for the detection of the neutrionoless double beta decay. The 82Se isotope acts as the source of the decay, and ZnSe detects the scintillation and bolometric events. Due to the high cost in the preparation of the Zn82Se material, the optimization of its properties, especially those related to the scintillation process, is mandatory. It is well known that excellent scintillation efficiency in ZnSe is obtained when the material presents close donor–acceptor pairs, as, for example, the A-centers. In this work, neutron irradiation was used to study formation of point defects in enriched and non-enriched ZnSe samples. Applying instrumental neutron activation analysis (INAA) and inductively coupled plasma mass spectroscopy, the enrichment of Zn82Se samples was determined to ∼95%, in addition, trace impurities such as Cu, I, and Na were quantified by INAA at the μg/g level. Based on electron paramagnetic resonance (EPR) and photo-EPR measurements, we show that irradiation with fast neutrons induced point defects such as the isolated zinc vacancy (VZn) and a new low-symmetric donor center called NC1, which we tentatively assign to Zn di-interstitials. Low-temperature photoluminescence measurements of the neutron-irradiated Zn82Se revealed three broad PL bands centered in the visible spectral range. Based on the INAA analysis shown in this work, we attribute the previously unidentified 540 nm PL band in the Zn82Se sample to recombination between shallow donors and deep copper acceptors. The formation of point defects by neutron irradiation and their stability are discussed.

    Palavras-Chave: neutron sources; irradiation; zinc selenides; zinc 82; luminescence

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  • IPEN-DOC 28292

    ANDRADE, MARIANA N. ; OLIVEIRA, GLAUCIA C. ; CONTRIM, MARYCEL E.B. ; SENEDA, JOSE A. ; BUSTILLOS, OSCAR V. . Use of the ion exchange technique for purification of lithium carbonate for nuclear industry. In: INTERNATIONAL NUCLEAR ATLANTIC CONFERENCE, November 29 - December 2, 2021, Online. Proceedings... Rio de Janeiro: Associação Brasileira de Energia Nuclear, 2021.

    Palavras-Chave: enrichment; ion exchange; lithium; lithium carbonates; lithium compounds; nuclear industry; primary coolant circuits; purification; pwr type reactors; reactors; refrigeration

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  • IPEN-DOC 28291

    PAIXAO, CLAUDIA M. ; VICENTE, ROBERTO ; ARAUJO, LEANDRO G. de . Tratamento de rejeito borra de petróleo pela técnica de pirólise com microondas. In: INTERNATIONAL NUCLEAR ATLANTIC CONFERENCE, November 29 - December 2, 2021, Online. Proceedings... Rio de Janeiro: Associação Brasileira de Energia Nuclear, 2021.

    Palavras-Chave: drying; industrial wastes; microwave equipment; natural radioactivity; petroleum residues; pyrolysis; sludges; toxicity; spheroids

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  • IPEN-DOC 28290

    BOIANI, N.F. ; TOMINAGA, F.K. ; BORRELY, S.I. . Toxicity removal of pharmaceuticals mixtures through electron beam irradiation. In: INTERNATIONAL NUCLEAR ATLANTIC CONFERENCE, November 29 - December 2, 2021, Online. Proceedings... Rio de Janeiro: Associação Brasileira de Energia Nuclear, 2021.

    Palavras-Chave: aquatic ecosystems; contamination; drugs; electron beams; environmental impacts; pollutants; radiation dose units; toxicity; waste water

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  • IPEN-DOC 28289

    MELO, C.G. ; ROSA, J.R. ; BORRELY, S.I. ; PEREIRA, M.C.C. . Toxicity and absorciometric decay of textile dyeing effluent with reactive dyestuff RB21 submitted to electron beam irradiation. In: INTERNATIONAL NUCLEAR ATLANTIC CONFERENCE, November 29 - December 2, 2021, Online. Proceedings... Rio de Janeiro: Associação Brasileira de Energia Nuclear, 2021.

    Palavras-Chave: chemical effluents; ecology; electron beams; environmental impacts; irradiation; liquid wastes; textile industry; toxicity; water

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  • IPEN-DOC 28288

    BARIA, R. ; WATANABE, S.; MUNITA, C.S. ; SILVA, P.S.C. ; TATUMI, S.H.. Thorium, uranium and potassium levels of Brazil geological sediment by gamma-ray spectrometer and instrumental neutron activation analysis. In: INTERNATIONAL NUCLEAR ATLANTIC CONFERENCE, November 29 - December 2, 2021, Online. Proceedings... Rio de Janeiro: Associação Brasileira de Energia Nuclear, 2021.

    Palavras-Chave: comparative evaluations; geology; neutron activation analysis; potassium; seawater; seaweeds; sediments; thorium; uranium; x-ray spectroscopy

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  • IPEN-DOC 28349

    HARDER, MARCIA N.C. ; FORMAGGIO, IAN H.; HARDER, LARISSA N.C. ; BOVI, DEBORA C.M. de L.; ARTHUR, PAULA B. ; ARTHUR, VALTER . Natural coloring red beetroot under effects of gamma radiation. Horticulture International Journal, v. 5, n. 3, p. 129‒132, 2021. DOI: 10.15406/hij.2021.05.00218

    Abstract: As color is an important attribute related to the visual appeal and quality of food products, the reduction of pigment losses during food processing is a basic concern fr the industry. Based on this, the objective of this work was to evaluate the resistance of betalain from beet against the use of gamma radiation. Analyzes were carried out on pigments belonging to the betalain class on beets exposed to different doses of gamma radiation (Co60) using doses of 5, 10 and 15 kGy on beets, in addition to anon-irradiated sample for control. Color parameters were evaluated using the CIE L, a*, b * methodology, as well as the quantification of betalain in the samples. By of results the color parameters were affected in until 50% in relation the control. And the quantity betalain activity in the sample irradiated with doses of gamma radiation was more less 65% in relation the control. Therefore, it can be concluded that there is a potential resistance of the betalain pigment in the face of high doses of radiation, which returns interest to red beetroot dyes since most pigments are fragile to thermal treatments or with ionizing radiation.

    Palavras-Chave: beets; gamma radiation; color; food processing; irradiation

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  • IPEN-DOC 28348

    GARCIA, VANESSA S.G. ; TALLARICO, LENITA de F.; ROSA, JORGE M. ; SUZUKI, CELSO F.; ROUBICEK, DEBORAH A.; NAKANO, ELIANA; BORRELY, SUELI I. . Multiple adverse effects of textile effluents and reactive Red 239 dye to aquatic organisms. Environmental Science and Pollution Research, v. 28, n. 44, p. 63202-63214, 2021. DOI: 10.1007/s11356-021-15115-7

    Abstract: Textile dyeing consumes high volumes of water, generating proportional number of colored effluents which contain several hazardous chemical. These contaminants can implicate in significant changes in aquatic environmental, including several adverse effects to organisms in different trophic levels. The present study was developed to assess the ecotoxicological effects of textile effluent samples and reactive Red 239 dye (used in cotton dyeing) to aquatic organisms Vibrio fischeri bacteria, Daphnia similis crustacean, and Biomphalaria glabrata snail (adults and embryos). Chronic assays with lethal and sublethal effects for Daphnia similis were included and performed only for textile effluents samples. The mutagenicity was also evaluated with Salmonella/microsome assay (TA98, TA100, and YG1041 strains). V. fischeri bacteria was the most sensitive to reactive Red 239 dye (EC50 = 10.14 mg L−1) followed by mollusk embryos at all stages (EC50 = 116.41 to 124.14 mg L−1), D. similis (EC50= 389.42 mg L−1), and less sensitive to adult snails (LC50= 517.19 mg L−1). The textile effluent was toxic for all exposed organisms [E(L)C50 < 15%] and B. glabrata embryos showed different responses in the early stages of blastulae and gastrulae (EC50 = 7.60 and 7.08%) compared to advanced development stages trochophore and veliger (EC50 = 21.56 and 29.32%). Developmental and sublethal effects in B. glabrata embryos and D. similis were evidenced. In the chronic assay with effluent, the EC10/NOEC = 3% was obtained. Mutagenic effects were not detected for dye aqueous solutions neither for effluents samples. These data confirmed the importance of evaluating the effects in aquatic organisms from different trophic levels and reinforce the need for environmental aquatic protection.

    Palavras-Chave: textile industry; liquid wastes; dyes; toxicity; color; daphnia; waste water

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  • IPEN-DOC 28287

    ABE, ALFREDO ; MELLO, CAIO; SANTOS, TAMIRYS; GIOVEDI, CLAUDIA. The FeCrAl cladding assessment under accident condition using TRANSURANUS fuel performance code. In: INTERNATIONAL NUCLEAR ATLANTIC CONFERENCE, November 29 - December 2, 2021, Online. Proceedings... Rio de Janeiro: Associação Brasileira de Energia Nuclear, 2021.

    Palavras-Chave: computerized simulation; t codes; iron alloys; zirconium alloys; reactivity; ballooning instability; thermodynamic properties; nuclear fuels; thickness; chromium; cladding

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  • IPEN-DOC 28347

    MONTALVAN-OLIVARES, D.M.; SANTANA, C.S.; VELASCO, F.G.; LUZARDO, F.H.M.; ANDRADE, S.F.R.; TICIANELLI, R.B. ; ARMELIN, M.J.A. ; GENEZINI, F.A. . Multi-element contamination in soils from major mining areas in Northeastern of Brazil. Environmental Geochemistry and Health, v. 43, n. 11, p. 4553-4576, 2021. DOI: 10.1007/s10653-021-00934-x

    Abstract: Mining has become one of the main factors in the global biogeochemical cycle of potentially toxic elements. Therefore, it is considered one of the anthropogenic activities with the greatest negative impact on the environment. These impacts are maximized in semiarid regions, where mining activities can lead to soil degradation and decrease in land productivity. This study aimed to assess the level of contamination in natural, urban, and agricultural soils of three important mining areas, where approximately 80,000 people live, and pollution levels have never been determined before. For this purpose, soil samples were collected around iron, uranium, and vanadium mines, as well as in the main human settlements of the region. The concentrations of 34 elements were determined by instrumental neutron analysis activation (INAA) and inductively coupled plasma optical emission spectrometry (ICP OES) techniques. Pollution indices (CF, EF, mCd, PLI, and REEP) revealed that there is a moderate to heavy level of pollution for 89% of the analyzed elements. Additionally, an extreme contamination level was observed in 78% of the samples, for at least one element. Statistical analyses were performed to identify patterns in the distribution and common sources of pollution. The results suggest that the concentrations for Al, Ba, Hf, Na, Pb, Rb, REE, Ta, Th, U, Zn, and Zr are associated with geogenic causes. However, the influence of anthropogenic sources such as agriculture and mining on the accumulation of these elements in soils should not be disregarded. In contrast, the contents of As, Br, Cd, Co, Cr, Cs, Cu, Fe, K, Mn, Ni, Sc, Ti, and V reflect the direct impact of anthropogenic sources.

    Palavras-Chave: soils; pollution; trace amounts; mining; neutron activation analysis; environmental impacts; emission spectroscopy; plasma

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  • IPEN-DOC 28346

    JANUARIO, ELIANE R. ; SILVAINO, PATRICIA F. ; MACHADO, ARTHUR P. ; VAZ, JORGE M. ; SPINACE, ESTEVAM V. . Methane Conversion Under Mild Conditions Using Semiconductors and Metal-Semiconductors as Heterogeneous Photocatalysts: State of the Art and Challenges. Frontiers in Chemistry, v. 9, p. 1-11, 2021. DOI: 10.3389/fchem.2021.685073

    Abstract: The processes currently used in the chemical industry for methane conversion into fuels and chemicals operate under extreme conditions like high temperatures and pressures. In this sense, the search for methane conversion under mild conditions remains a great challenge. This review aims to summarize the use semiconductors and metal-semiconductors as heterogeneous photocatalysts for methane conversion under mild conditions into valuable products. First, a brief presentation of photochemical conversion of methane is provided and then the focus of this review on the use of heterogeneous photocatalysts for methane conversion are described. Finally, the main challenges and opportunities are discussed.

    Palavras-Chave: semiconductor materials; photocatalysis; heterogeneous catalysis; methane

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  • IPEN-DOC 28345

    HATTORI, C.S. ; ALMEIDA, G.F.C. ; GONCALVES, R.L.P.; SANTOS, R.G.; SOUZA, R.C.; SILVA JUNIOR, W.C. da; CUNALI JUNIOR, J.R.C.; COUTO, A.A. . Microstructure and fatigue properties of extruded aluminum alloys 7046 and 7108 for automotive applications. Journal of Materials Research and Technology, v. 14, p. 2970-2981, 2021. DOI: 10.1016/j.jmrt.2021.08.085

    Abstract: This work aimed to obtain by extrusion two aluminum alloys, 7108 and 7046. The microstructural characterized at each stage of the manufacturing process and the mechanical fatigue behavior of the extruded profile were evaluated. The aluminum alloys in the as-casted condition exhibited an interdendritic microsegregation inside the grains, with intermetallic phases precipitated on the grain boundaries. In the homogenization of the billets of the AA7108 and AA7046, the precipitated phases dissolved. The AA 7046, in the as-casted condition, displayed shrinkage microvoids throughout the length of the billet and a microstructure of heterogeneous grains, with the presence of a remelted layer at a maximum depth of 10 mm. The AA7046 displayed better tensile and fatigue properties than the AA7108. A higher surface roughness facilitated the initiation and propagation of cracks during the fatigue cycles. This effect was more pronounced with low levels of maximum stress and high number of cycles to failure. Deep secondary cracks perpendicular to the growth direction of the main crack were visible on all fracture surfaces. In the medium and high cycle fatigue tests of the AA7108 and AA7046, the cracks advanced in a perpendicular direction to the elongated grains resulting from the extrusion process. The fracture surfaces of the tested samples with a high number of cycles exhibited a region with a smaller crack propagation area and a larger region of rupture due to mechanical overload. The region of crack propagation is characterized by plastic deformation and the presence of striations perpendicular to the growth direction.

    Palavras-Chave: aluminium alloys; microstructure; extrusion; fracture mechanics; fatigue; automotive industry

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  • IPEN-DOC 28286

    PEREIRA, L.S. ; DONATO, G.H.B.; MATTAR NETO, MIGUEL . The effect of mass scaling and speed increase in explicit dynamic simulations using tensile test. In: INTERNATIONAL NUCLEAR ATLANTIC CONFERENCE, November 29 - December 2, 2021, Online. Proceedings... Rio de Janeiro: Associação Brasileira de Energia Nuclear, 2021.

    Palavras-Chave: poisson ratio; stresses; tensile properties; young modulus; testing; density; computerized simulation; velocity; strain rate

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  • IPEN-DOC 28285

    CASAS, A. ; ARAUJO, L. ; GARCIA, R. ; VICENTE, R. ; FRANCO, M. ; MARUMO, J. . Synthesis of geopolymers for immobilization of radioactive waste using sewage treatment plant sludge. In: INTERNATIONAL NUCLEAR ATLANTIC CONFERENCE, November 29 - December 2, 2021, Online. Proceedings... Rio de Janeiro: Associação Brasileira de Energia Nuclear, 2021.

    Palavras-Chave: ashes; binders; polymers; radioactive waste management; sewage sludge; solidification; waste processing; x-ray diffraction; x-ray fluorescence analysis

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  • IPEN-DOC 28284

    LIMA, N.P. ; BURIMOVA, A. ; SOUZA, A.P.S. ; LEITE NETO, OSMAR F.S. ; CARBONARI, A.W. . Synthesis and TDPAC characterization of multiferroics: the HoMnO3 case. In: INTERNATIONAL NUCLEAR ATLANTIC CONFERENCE, November 29 - December 2, 2021, Online. Proceedings... Rio de Janeiro: Associação Brasileira de Energia Nuclear, 2021.

    Palavras-Chave: magnetic fields; electric fields; sol-gel process; crystallography; x-ray diffraction; differential pac; indium 111; perovskite; solid state physics

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  • IPEN-DOC 28283

    SANTOS, A.G.M. ; SUZART, K.F. ; RODRIGUES, P.S. ; MASTRO, N.L. del . Study on the sociocultural profile of women working in a Brazilian nuclear area institution. In: INTERNATIONAL NUCLEAR ATLANTIC CONFERENCE, November 29 - December 2, 2021, Online. Proceedings... Rio de Janeiro: Associação Brasileira de Energia Nuclear, 2021.

    Palavras-Chave: women; education; nuclear energy; nuclear engineering; scientific personnel

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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, bibl@ipen.br .

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ATENÇÃO!

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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.