REPOSITÓRIO DIGITAL DA PRODUÇÃO TÉCNICO CIENTÍFICA

 

Conteúdo Temático

(Últimos 5 anos, somente artigos de periód.)

Tipos de materiais

Submissões recentes

  • IPEN-DOC 28437

    SONA FILHO, CELSO R. ; CARVALHO, FLAVIO M. de S.; GUEDES-SILVA, CECILIA C. . Mechanical properties and in vitro bioactivity of silicon nitride ceramics with SiO2, CaO, and MgO additions. Journal of Biomedical Materials Research Part B: Applied Biomaterials, v. 110, n. 3, p. 507-516, 2022. DOI: 10.1002/jbm.b.34930

    Abstract: Silicon nitride ceramics with SiO2, CaO, and MgO as sintering aids were investigated in view of biomedical applications. In the current study, samples with four different compositions were pressureless sintered at 1750°C for 1 h under a nitrogen atmosphere. The samples were evaluated concerning densification, microstructure, mechanical properties, and in vitro bioactivity. Microstructures with elongated β-Si3N4 grains dispersed in an intergranular phase and with densities from 78.77 to 97.14% of the theoretical density were obtained. Higher contents of SiO2 resulted in the best densification and mechanical properties. Besides, replacements of CaO by MgO in the initial compositions affected Young's modulus and in vitro bioactivity. Considering the samples with relative density higher than 94.14%, those with lower values of Young's modulus had lower SiO2/MgO ratios. After immersion in SBF (Simulated Body Fluid), the samples with high porosity and/or partial replacements of CaO by MgO had their surfaces coated with a layer rich in calcium and phosphorus, morphologically similar to hydroxyapatite. Hence, producing silicon nitride ceramics with the potential to be used as orthopedic implants must consider ideal amounts of additives. In this article, the best combination of mechanical properties and mineralization capability was reached by the composition with low content of MgO, and high content of SiO2 and CaO.

  • IPEN-DOC 28436

    CAETANO, GABRIELA A.; GONORING, TIAGO B.; COELHO, LUCAS M.; LUZ, TEMISTOCLES de S.; ROSSI, JESUALDO L. ; ORLANDO, MARCOS T.D.A.. Mechanical properties study of a duplex stainless steel weld using physical simulation and work hardening models. Journal of Materials Engineering and Performance, v. 31, n. 1, p. 113-127, 2022. DOI: 10.1007/s11665-021-06155-8

    Abstract: Transporting substances with high radioactivity used in nuclear medicine is strategic. Lean duplex stainless steel UNS S32304 is a candidate for external construction of a cask for transporting radioactive material. Thin sheet lean duplex stainless steel specimens were welded by autogenous TIG processing (tungsten inert gas) in order to avoid neutron activation of the filler metal. Post-welding heat treatments were studied considering a possible scenario of fire or crash during transportation. The metallographic analysis indicated that post-welding heat treatments promoted a change in austenitic phase content in the fusion zone. An analysis of the stress-strain curves using work hardening models revealed that only the Voce and Hockett–Sherby models presented goodness-of-fit to the experimental data. It was demonstrated that the parameters of both models are correlated to the volumetric austenitic phase content present in the fusion zone, being equivalent to the quantification of the bulk phase. This work proposes a new direct evaluation methodology for volumetrically quantifying phases using both mathematical work hardening models fitted to the experimental data from stress-strain curves.

  • IPEN-DOC 28435

    JUNIOR, ALEXANDRE F.; RIBEIRO, CHARLENE A.; LEYVA, MARIA E.; MARQUES, PAULO S.; SOARES, CARLOS R.J. ; QUEIROZ, ALVARO A.A. de . Biophysical properties of electrospun chitosan-grafted poly(lactic acid) nanofibrous scaffolds loaded with chondroitin sulfate and silver nanoparticles. Journal of Biomaterials Applications, v. 36, n. 6, p. 1098-1110, 2022. DOI: 10.1177/08853282211046418

    Abstract: The aim of this work was to study the biophysical properties of the chitosan-grafted poly(lactic acid) (CH-g-PLA) nanofibers loaded with silver nanoparticles (AgNPs) and chondroitin-4-sulfate (C4S). The electrospun CH-g-PLA:AgNP:C4S nanofibers were manufactured using the electrospinning technique. The microstructure of the CH-g-PLA:AgNP:C4S nanofibers was investigated by proton nuclear magnetic resonance (1H-NMR), scanning electron microscopy (SEM), UV-Visible spectroscopy (UV-Vis), X-ray diffraction (XRD), and Fourier transform infrared (ATR-FTIR) spectroscopy. ATR-FTIR and 1H-NMR confirm the CH grafting successfully by PLA with a substitution degree of 33.4%. The SEM measurement results indicated apparently smooth nanofibers having a diameter range of 340 ± 18 nm with porosity of 89 ± 3.08% and an average pore area of 0.27 μm2. UV-Vis and XRD suggest that silver nanoparticles with the size distribution of 30 nm were successfully incorporated into the electrospun nanofibers. The water contact angle of 12.8 ± 2.7° reveals the hydrophilic nature of the CH-g-PLA:AgNP:C4S nanofibers has been improved by C4S. The electrospun CH-g-PLA:AgNP:C4S nanofibers are found to release ions Ag+ at a concentration level capable of rendering an antimicrobial efficacy. Gram-positive bacteria (S.aureus) were more sensitive to CH-g-PLA:AgNP:C4S than Gram-negative bacteria (E. coli). The electrospun CH-g-PLA:AgNP:C4S nanofibers exhibited no cytotoxicity to the L-929 fibroblast cells, suggesting cytocompatibility. Fluorescence microscopy demonstrated that C4S promotes the adhesion and proliferation of fibroblast cells onto electrospun CH-g-PLA:AgNP:C4S nanofibers.

  • IPEN-DOC 28434

    ZAHARESCU, TRAIAN; MATEESCU, CARMEN; DIMA, ANDREEA; VARCA, GUSTAVO H.C. . Evaluation of thermal and radiation stability of EPDM in the presence of some algal powders. Journal of Thermal Analysis and Calorimetry, v. 147, n. 1, p. 327-336, 2022. DOI: 10.1007/s10973-020-10319-4

    Abstract: In this paper, ecological-friendly materials based on ethylene–propylene–diene terpolymer (EPDM) with improved thermal and radiation stabilities by Chlorella vulgaris (CV) and Spirulina platensis (SP) powders were investigated by complementary procedures: FTIR spectroscopy and isothermal and nonisothermal chemiluminescence (CL). The stabilization potential of microalgae was evaluated at several degrees of γ-radiolysis by 2,2-diphenyl-1-picrylhydrazyl (DPPH) radical scavenging assay, while the polymer resistances were studied on a large range of algal concentrations (1, 3, 5 and 10 mass%). The carbonyl and hydroxyl indices of all degraded EPDM formulations were found to be two times smaller in the presence of algal powders, if compared to the pristine material. Some dissimilarities between the oxidation development in pristine and modified EPDM appeared, especially in unirradiated samples. The activation energies required for the oxidation of EPDM and the lifetime of these samples at various temperatures between room temperature and 100 °C were calculated. The antioxidant compounds existing in the studied microalgae proved a significant influence on the stability of EPDM, mainly in the presence of SP, which was confirmed by the activation energies calculated from our CL results. The investigation of cycling thermal degradation revealed the obvious contribution of additives towards delaying EPDM ageing.

  • IPEN-DOC 28433

    NUNES, R.F.; TOMINAGA, F.K. ; BORRELY, S.I. ; TEIXEIRA, A.C.S.C.. UVA/persulfate-driven nonylphenol polyethoxylate degradation: effect of process conditions. Environmental Technology, v. 43, n. 2, p. 286-300, 2022. DOI: 10.1080/09593330.2020.1786166

    Abstract: UV/persulfate (UV/PS) technologies have gained increased attention as efficient alternatives for removing pollutants from different classes, although processes based on the UVA-driven S2O2−8 (PS) activation have not yet been discussed in the literature for the removal of the nonionic surfactant nonylphenol polyethoxylate (NPEO). The present study investigated the simultaneous effect of the initial persulfate concentration ([PS]0) and specific photon emission rate (EP,0) on NPEO degradation by UVA/PS following a Doehlert experimental design. The results for [NPEO]0 = (4.65 ± 0.15) mg L−1 indicated more than 97.8% NPEO removal after 2 h, with pseudo first-order specific degradation rate (kobs) of 0.0320 min−1, for [PS]0 = 7.75 mmol L−1 and EP,0 = 0.437 μmol photons L−1 s−1. Under these conditions, NPEO half-life time was about 22 min, and the EC50-48 h (% v/v) values for Daphnia similis before and after treatment did not differ significantly. Higher values of EP,0 would influence NPEO removal for [PS]0 not higher than 8–10 mmol L−1, although lower degradation efficiencies were obtained with higher [NPEO]0 or real wastewater, except for longer reaction times. Additionally, UVA/PS showed to be efficient for tensoactivity removal, despite the negligible total organic carbon (TOC) removal achieved. Finally, UVC and UVA resulted in NPEO degradation higher than 96% and similar tensoactivity removals when UVA/PS was conducted under optimal conditions ([PS]0 = 10 mmol L−1; EP,0 = 0.324 μmol photons L−1 s−1), suggesting that UVA radiation available in solar light could be advantageously employed for NPEO removal at concentrations usually found in wastewater.

  • IPEN-DOC 28432

    ALVES, ALINE V.; FERRAZ, MARIANA A.; MORENO, BEATRIZ B.; NOBRE, CAIO R.; ANTUNES, RENATA M.; PUSCEDDU, FABIO H.; BORDON, ISABELLA C. da C.L.; FAVARO, DEBORAH I.T. ; COTRIM, MARYCEL E.B. ; CHOUERI, RODRIGO B.. Microscale Toxicity Identification Evaluation (TIE) for interstitial water of estuarine sediments affected by multiple sources of pollution. Environmental Science and Pollution Research, v. 29, p. 10122-10137, 2022. DOI: 10.1007/s11356-021-15389-x

    Abstract: Estuaries in the world are affected by different contamination sources related to urbanisation and port/industrial activities. Identifying the substances responsible for the environmental toxicity in estuaries is challenging due to the multitude of stressors, both natural and anthropogenic. The Toxicity Identification and Evaluation (TIE) is a suitable way of determining causes of toxicity of sediments, but it poses difficulties since its application is labour intensive and time consuming. The aimof this study is to evaluate the diagnosis provided by a TIE based on microscale embryotoxicity tests with interstitial water (IW) to identify toxicants in estuarine sediments affected by multiple stressors. TIE showed toxicity due to different combinations of metals, apolar organic compounds, ammonia and sulphides, depending on the contamination source closest to the sampling station. The microscale TIE was able to discern different toxicants on sites subject to different contamination sources. There is good agreement between the results indicated in the TIE and the chemical analyses in whole sediment, although there are some disagreements, either due to the sensitivity of the test used, or due to the particularities of the use of interstitial water to assess the sediment toxicity. The improvement of TIE methods focused on identifying toxicants in multiple-stressed estuarine areas are crucial to discern contamination sources and subsidise management strategies.

  • IPEN-DOC 28431

    SANTOS, S.C. ; RODRIGUES JUNIOR, O. ; CAMPOS, L.L. . Colloidal processing of thulium-yttria microceramics. Journal of Physics and Chemistry of Solids, v. 161, p. 1-10, 2022. DOI: 10.1016/j.jpcs.2021.110420

    Abstract: The development of new dosimetric materials is essential for the safe and effective use of nuclear technology. In the present study, an eco-friendly bio-prototyping approach was developed for preparing thulium-yttria microceramics with potential applications in radiation dosimetry. Micro-powder compacts were obtained by casting colloidal thulium-yttria suspensions prepared with 20 vol% particles in thin-walled tube templates. Samples were sintered at 1600 °C for 2 h under the environmental pressure and atmosphere to obtain thulium-yttria microceramics with dimensions of 3.33 ± 0.01 mm × 2.27 ± 0.01 mm (height × diameter), as well as a cubic C-type structure, pycnometric density of 4.79 g cm−3 (95.61% theoretical density), and surface microstructure comprising hexagon-like grains bonded at the boundaries. The use of thulium as an activator of yttria greatly improved the electron paramagnetic resonance (EPR) response of the microceramics, where the main EPR peak (p1) was recorded at 351.24 mT and the g factor was 2.0046. The innovative findings obtained in this study may facilitate the production of new solid state dosimeters.

  • IPEN-DOC 28430

    PALHARIM, PRISCILA H.; FUSARI, BEATRIZ L.D. dos R.; RAMOS, BRUNO; OTUBO, LARISSA ; TEIXEIRA, ANTONIO C.S.C.. Effect of HCl and HNO3 on the synthesis of pure and silver-based WO3 for improved photocatalytic activity under sunlight. Journal of Photochemistry and Photobiology A: Chemistry, v. 422, p. 1-12, 2022. DOI: 10.1016/j.jphotochem.2021.113550

    Abstract: Heterogeneous photocatalysis have been considered an important and efficient alternative water and wastewater treatment process. In this area, different semiconductors, such as tungsten trioxide, have been investigated aiming to enhance photocatalytic performance. WO3 is known to be an efficient material with high stability in acidic conditions. In the present work, pure and Ag/AgCl-doped WO3 photocatalysts were synthesized by a simple hydrothermal method. A discussion of the effects of two pH-controlling agents, HCl and HNO3, in the final properties of the catalyst is reported for the first time. The materials were characterized by XRD, BET, SEM, EDS and UV–vis DRS. All catalysts showed similar or enhanced band gap values compared to a standard photocatalyst benchmark (TiO2 P25). The type of acid did not lead to significant differences in morphology or photocatalytic activity of undoped catalysts. In contrast, doped catalysts prepared using HCl resulted in particles of flower-like morphology, with higher uniformity and slightly narrower band gap values. Furthermore, the use of HCl in the synthesis of silver-doped WO3 resulted in catalysts containing AgCl, while Ag0 was the major dopant species when HNO3 was used. All materials exhibited good photocatalytic activity, with a maximum of 75.4% acetaminophen degradation under simulated sunlight achieved by the catalyst prepared with HCl and doped with 5% Ag-equivalent. For this catalyst, the degradation kinetics was found to be consistent with the Langmuir-Hinshelwood (L−H) model, and reusability tests showed no significant decrease in the degradation efficiency after four cycles. Finally, the effects of different scavengers suggest that O2•− species play a major role in acetaminophen degradation with the material containing WO3, Ag and AgCl.

  • IPEN-DOC 28429

    CATANHEIRA, BRUNA; OTUBO, LARISSA ; OLIVEIRA, CRISTIANO L.P.; MONTES, ROSA; QUINTANA, JOSE B.; RODIL, ROSARIO; BROCHSZTAIN, SERGIO; VILAR, VITOR J.P.; TEIXEIRA, ANTONIO C.S.C.. Functionalized mesoporous silicas SBA-15 for heterogeneous photocatalysis towards CECs removal from secondary urban wastewater. Chemosphere, v. 287, Part 1, p. 1-11, 2022. DOI: 10.1016/j.chemosphere.2021.132023

    Abstract: The photocatalytic activity of TiO2 nanoparticles (NPs) supported on mesoporous silica SBA-15 (TiO2/SBA-15) was evaluated for the photodegradation of sulfadiazine (SDZ), as target contaminant of emerging concern (CEC), using either pure water solutions (PW) or a real secondary urban wastewater (UWW) spiked with SDZ. For this purpose, TiO2/SBA-15 samples with 10, 20 and 30% TiO2 (w/w) were prepared by the sol-gel post synthetic method on pre-formed SBA-15, using titanium (IV) isopropoxide as a precursor. The TiO2/SBA-15 materials were characterized by HRTEM, SAXS and XRD, nitrogen adsorption isotherms and UV–vis diffuse reflectance spectroscopy. TiO2 NPs were shown to be attached onto the external surface, decorating the SBA-15 particles. The TiO2/SBA-15 catalysts were active in SDZ photodegradation using the annular FluHelik photoreactor, when irradiated with UVA light. The 30% TiO2/SBA-15 sample presented the best performance in optimization tests performed using PW, and it was further used for the tests with UWW. The photocatalytic activity of 30% TiO2/SBA-15 was higher (56% SDZ degradation) than that of standard TiO2–P25 (32% SDZ degradation) in the removal of SDZ spiked in the UWW ([SDZ] = 2 mg L−1). The photodegradation of SDZ with 30% TiO2/SBA-15 eached 90% for UWW spiked with a lower SDZ concentration ([SDZ] = 40 μg L−1). Aside of SDZ, a suit of 65 other CECs were also identified in the UWW sample using LC-MS spectrometry. A fast-screening test showed the heterogeneous photocatalytic system was able to remove most of the detected CECs from UWW, by either adsorption and/or photocatalysis.

  • IPEN-DOC 28428

    NASCIMENTO, ERIBERTO O. do; BECATTI, MATHEUS J.P.; CALDAS, LINDA V.E. ; OLIVEIRA, LUCAS N. de . Design of Experiments (DoE) method for solar protective films via UV–Vis and NIR spectrophotometry measurements. Journal of Luminescence, v. 242, p. 1-10, 2022. DOI: 10.1016/j.jlumin.2021.118558

    Abstract: Individual dosimetry and the shielding of sun rays are needed for people in homes, at workplaces and vehicles when exposed to Ultraviolet Radiation (UVR) and/or Infrared Radiation (IR). Usually, the efficacy of Solar Protective Films (SPF) has been recognized as an important public health concern. So, this work aimed to verify, using the Design of Experiments (DoE) and Multiple Linear Regression (MLR) methods, the evaluation of solar films using the UV–Vis and NIR (Near Infrared) spectrophotometry technique for absorbance readings. In addition, the significance of the SPF manufacturing origin and glass color were evaluated. Four types of SPF, named G05, G20, G35 and WB, were tested and layered within dark and light glasses. The absorbance readings were used in a 2k factorial design analysis, then the one-way ANOVA Test and the Bonferroni Test were used to assess the statistical significance of each factor. The results showed that the statistical error, using the Root Mean Square Percentage Error (RMSPE) and the Mean Absolute Percentage Error (MAPE) methods, showed values less than 0.014% between the measured and the predicted ones, indicating excellent accuracy. In conclusion, DoE and MLR methods are suitable to be used in the investigation of the association between SPF and glass materials.

  • IPEN-DOC 28427

    DURAZZO, MICHELANGELO ; SOUZA, JOSE A.B. ; IANELLI, RICARDO F. ; TAKARA, ERIKI M. ; GARCIA NETO, JOSE S. ; SALIBA-SILVA, ADONIS M. ; CARVALHO, ELITA F.U. de . Manufacturing LEU-foil annular target in Brazil. Annals of Nuclear Energy, v. 165, p. 1-16, 2022. DOI: 10.1016/j.anucene.2021.108646

    Abstract: Molybdenum-99 is the most important isotope because its daughter isotope, technetium-99m, has been the most used medical radioisotope. The primary method used to produce Mo-99 derives from the fission of U-235 incorporated in so-called irradiation targets. Two routes are being developed to make Mo-99 by fissioning with low enriched uranium (LEU) fuel. The first adopts UAlx-Al dispersion plate targets. The second uses uranium metal foil annular targets. The significant advantage of uranium foil targets over UAlx-Al dispersion targets is the high density of uranium metal. This work presents the experience obtained in the development of the uranium metal annular target manufacturing steps. An innovative method to improve the procedure for assembling the uranium foil on the tubular target was presented. The experience attained will help the future production of Mo-99 in Brazil through the target irradiation in the Brazilian Multipurpose Reactor (RMB).

  • IPEN-DOC 28426

    GUIMARAES, LEONAM dos S.; PERROTTA, JOSE A. . Brazil looks to HALEU. Nuclear Engineering International, v. 65, n. 790, p. 22-23, 2020.

  • IPEN-DOC 28425

    CAPPUZZELLO, F.; AGODI, C.; ACOSTA, L.; ALTANA, C.; AMADOR-VALENZUELA, P.; AUERBACH, N.; BAREA, J.; BELLONE, J.; BIJKER, R.; BONANNO, D.; BORELLO-LEWIN, T.; BOZTOSUN, I.; BRANCHINA, V.; BRASOLIN, S.; BRISCHETTO, G.; BRUNASSO, O.; BURRELLO, S.; CALABRESE, S.; CALABRETTA, L.; CALVO, D.; CAPIROSSI, V.; CARBONE, D.; CAVALLARO, M.; CHARON GARCIA, L.E.; CHAVEZ LOMELI, E.R.; CHEN, R.; CIRALDO, I.; COLONNA, M.; D'AGOSTINO, G.; DELAUNAY, F.; DESHMUKH, N.; DJAPO, H.; DE GERONIMO, G.; DE LOS RIOS, K.; FERRARESI, C.; FERREIRA, J.L.; FERRETTI, J.; FINOCCHIARO, P.; FIRAT, S.; FISICHELLA, M.; FOTI, A.; GALLO, G.; GARCIA-TECOCOATZI, H.; HACISALIHOGLU, A.; HUERTA-HERNANDEZ, A.; KOTILA, Z.J.; KUCUK, Y.; IAZZI, F.; LANZALONE, G.; LAY, J.A.; LA FAUCI, L.; LA VIA, F.; LENSKE, H.; LINARES, R.; LO PRESTI, D.; LUBIAN, J.; MA, J.; MARIN-LAMBARRI, D.; MAS RUIZ, J.; MEDINA, N.H.; MENDES, D.R.; MEREU, P.; MORALLES, M. ; NERI, L.; OLIVEIRA, J.R.B.; PAKOU, A.; PANDOLA, L.; PETRASCU, H.; PIETRALLA, N.; PINNA, F.; REITO, S.; RIES, P.; RODRIGUES, M.R.D.; RUSSO, A.D.; RUSSO, G.; SANTOPINTO, E.; SANTOS, R.B.B.; SERBINA, L.; SGOUROS, O.; SILVEIRA, M.A.G. da; SOLAKCI, S.O.; SOULIOTIS, G.; SOUKERAS, V.; SPATAFORA, A.; TORRESI, D.; TUDISCO, S.; VARGAS HERNANDEZ, H.; VSEVOLODOVNA, R.I.M.; WANG, J.S.; WERNER, V.; YANG, Y.Y.; YILDIRIN, A.; ZAGATTO, V.A.B.. Recent results on heavy-ion induced reactions of interest for neutrinoless double beta decay at INFN-LNS. Journal of Physics: Conference Series, v. 1643, p. 1-5, 2020. DOI: 10.1088/1742-6596/1643/1/012074

    Abstract: The NUMEN project aims at accessing experimentally driven information on Nuclear Matrix Elements (NME) involved in the half-life of the neutrinoless double beta decay (0νββ). In this view measurements of Heavy Ion (HI) induced Double Charge Exchange (DCE) reaction cross sections are performed with high-accuracy. In particular, the (18O,18Ne) and (20Ne,20O) reactions are used as tools for β+β+ and β-β- decays, respectively. In the experiments, performed at INFN - Laboratory Nazionali del Sud (LNS) in Catania, the beams are accelerated by the Superconducting Cyclotron (CS) and the reaction ejectiles are detected the MAGNEX magnetic spectrometer. The measured cross sections are challengingly low (a few nb), being the total reaction cross section much larger (a few b), thus a high sensitivity and a large rejection capability are demanded to the experimental set-up. This limits the present exploration to few selected isotopes of interest in the context of typically low-yield experimental runs. A major upgrade of the LNS facility is under way in order to increase the experimental dataset of more than two orders of magnitude, still preserving the high sensitivity of the present set-up. When accomplished this effort will make the INFN-LNS as the state-of-the-art research infrastructure for the systematic study of all the cases of interest for 0νββ. In this view, frontiers technologies are going to be adopted for the accelerator and the detection systems. In parallel, advanced theoretical models are being developed in order to extract the nuclear structure information from the measured cross sections.

  • IPEN-DOC 28424

    BADE, TAMIRIS G.; ROUDET, JAMES; GUICHON, JEAN-MICHEL; KUO-PENG, PATRICK; SARTORI, CARLOS A.F. . Analysis of the resonance phenomenon in unmatched power cables with the resonance surface response. Electric Power Systems Research, v. 200, p. 1-12, 2021. DOI: 10.1016/j.epsr.2021.107466

    Abstract: Power converters are an essential part of modern power systems, giving flexibility to the power transportation and allowing the insertion of a wide range of different energy sources. One drawback of the converters is that the supraharmonic conducted emissions introduced by them can compromise the stability of these systems through electromagnetic interference (EMI). Electromagnetic compatibility (EMC) filters are used to prevent such problems. Nevertheless, these filters are designed to respect standards based on measurements in conditions considerably different from real applications. Particularly, if a converter is connected to electrically long cables its conducted emissions may be amplified by the resonance phenomenon. The method described in this paper allows the definition of a range for the filters input impedances where the conducted emissions in a long cable will not be amplified beyond established levels. In some cases the method allows the visualization of three-dimensional surfaces indicating the magnitude, frequency and position of the resonance phenomenon. In the general case these surfaces are defined on higher dimensions and can be analyzed with deterministic optimization algorithms. The originality of this paper resides in the generalized analysis of the resonance phenomenon, that it is based on frequency-dependent cable parameters and applies to unbalanced systems.

  • IPEN-DOC 28423

    MERIZIO, L.G.; BONTURIM, E.; ICHIKAWA, R.U. ; SILVA, I.G.N.; TEIXEIRA, V.C.; RODRIGUES, L.C.V.; BRITO, H.F.. Toward an energy-efficient synthesis method to improve persistent luminescence of Sr2MgSi2O7:Eu2+,Dy3+ materials. Materialia, v. 20, p. 1-10, 2021. DOI: 10.1016/j.mtla.2021.101226

    Abstract: The synthesis of persistent luminescent materials usually requires a multi-step long time annealing at high temperatures (>1200°C) in a resistive oven, causing a huge energy consumption. Also, to achieve reduced oxidation states of emitter ions (e.g., Eu3+ → Eu2+ ), the H2(g) atmosphere is often used, which can be dangerous and increase the costs of the process. Therefore, the development of a quick and new single-step green strategy, using in-situ low-risk atmosphere (e.g., CO(g)) and a microwave-assisted solid-state (MASS) method has been encouraged. In this work, we present a single-step method to synthesize the compound Sr2MgSi2O7:Eu2+,Dy3+ using the MASS method and the results were compared with those prepared by a conventional ceramic method. The luminescent material was prepared in 25 min of synthesis using carbon as a microwave susceptor and CO(g) atmosphere source at the same time. A higher concentration of Eu2+ emitter was identified by XANES in the MASS method product, which has a significant effect on the luminescence efficiency, as well as an improvement in the optical properties, leading to an emission 100 times more intense. Furthermore, to understand the Eu3+ reduction process under CO(g) atmosphere, we present here the innovative results of in-situ XANES analysis for the Sr2MgSi2O7:Eu2+,Dy3+ material. Finally, the MASS method makes it possible to prepare the materials with less than 5% of the ceramic method's duration in time. The energy-saving and better-quality persistent luminescent properties obtained in the MASS method provide viable applications on anti-counterfeiting markers, solar cell sensitizers, and other luminescent technologies.

  • IPEN-DOC 28421

    CAPPARELLI, MARIANA V.; MOLINERO, JON; MOULATLET, GABRIEL M.; BARRADO, MIREN; PRADO-ALCIVAR, SANTIAGO; CABRERA, MARCELA; GIMILIANI, GIOVANA ; NACATO, CAROLINA; PINOS-VELEZ, VERONICA; CIPRIANI-AVILA, ISABEL. Microplastics in rivers and coastal waters of the province of Esmeraldas, Ecuador. Marine Pollution Bulletin, v. 173, Part B, p. 1-6, 2021. DOI: 10.1016/j.marpolbul.2021.113067

    Abstract: This study represents the first assessment of microplastic (MP) contamination in the coastal area of the Esmeraldas Province, Ecuador. MPs were quantified in 14 coastal waters in beaches with different urbanization level and in 10 rivers. The most abundant MP types were transparent fibres, brown fragments, grey fragments, transparent fragments, and black fragments, which together represented 84% of the total count. Coastal waters presented significantly higher quantities of MP than rivers. No difference in microplastic abundance was detected between beaches with higher and lower urban occupation, nor between beaches facing North or West. Our results indicate that MP contamination is widespread, and most likely transported from multiple sources. Our results can serve as a baseline for future MP monitoring in the area.

  • IPEN-DOC 28422

    AMARAL, MARCELO P.; COIRADA, FERNANDA C.; APOSTOLICO, JULIANA de S.; TOMITA, NADIA; FERNANDES, EDGAR R.; SOUZA, HIGO F.S.; CHURA-CHAMBI, ROSA M. ; MORGANTI, LIGIA ; BOSCARDIN, SILVIA B.; ROSA, DANIELA S.. Prime-boost with Chikungunya virus E2 envelope protein combined with Poly (I:C) induces specific humoral and cellular immune responses. Current Research in Immunology, v. 2, p. 23-31, 2021. DOI: 10.1016/j.crimmu.2021.03.001

    Abstract: Chikungunya virus (CHIKV) is an arbovirus transmitted to humans mainly by the bite of infected Aedes aegypti and Aedes albopictus mosquitoes. CHIKV illness is characterized by fever and long-lasting arthritic symptoms, and in some cases it is a deadly disease. The CHIKV envelope E2 (E2CHIKV) glycoprotein is crucial for virus attachment to the cell. Furthermore, E2CHIKV is the immunodominant protein and the main target of neutralizing antibodies. To date, there is no available prophylactic vaccine or specific treatment against CHIKV infection. Here, we designed and produced a DNA vaccine and a recombinant protein containing a consensus sequence of E2CHIKV. C57BL/6 mice immunized twice with the E2CHIKV recombinant protein in the presence of the adjuvant Poly (I:C) induced the highest E2CHIKV-specific humoral and cellular immune responses, while the immunization with the homologous DNA vaccine pVAX-E2CHIKV was able to induce specific IFN-γ producing cells. The heterologous prime-boost strategy was also able to induce specific cellular and humoral immune responses that were, in general, lower than the responses induced by the homologous E2CHIKV recombinant protein immunization. Furthermore, recombinant E2CHIKV induced the highest titers of neutralizing antibodies. Collectively, we believe this is the first report to analyze E2CHIKV-specific humoral and cellular immune responses after immunization with E2CHIKV recombinant protein and DNA pVAX-E2CHIKV vaccine platforms.

  • 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.

  • 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.

  • 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.

  • 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.

  • 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.

  • 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.

  • 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.

  • 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).

  • 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.

  • 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.

  • 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.

  • 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.

  • 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.

  • 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.

  • 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.

  • 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.

  • 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.

  • 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.

  • 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

  • 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

  • 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

  • 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

  • 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

  • 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

  • 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

  • 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

  • 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.

  • 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

  • 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.

  • 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.

  • 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.

  • 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.

  • 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.

View more

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

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

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

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

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

Exemplo:

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

Autor: Maprelian

Título: loss of coolant

Tipo de publicação: Texto completo de evento

Ano de publicação: 2015

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

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

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

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

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

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

ATENÇÃO!

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

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

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

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


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

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

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

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

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