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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. [Saiba mais]

 

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  • IPEN-DOC 24676

    BEDOYA-VELASQUEZ, ANDRES E.; NAVAS-GUZMAN, FRANCISCO; GRANADOS-MUNOZ, MARIA J.; TITOS, GLORIA; ROMAN, ROBERTO; CASQUERO-VERA, JUAN A.; ORTIZ-AMEZCUA, PABLO; BENAVENT-OLTRA, JOSE A.; MOREIRA, GREGORI de A. ; MONTILLA-ROSERO, ELENA; HOYOS, CARLOS D.; ARTINANO, BEGONA; COZ, ESTHER; OLMO-REYES, FRANCISCO J.; ALADOS-ARBOLEDAS, LUCAS; GUERRERO-RASCADO, JUAN L.. Hygroscopic growth study in the framework of EARLINET during the SLOPE I campaign: synergy of remote sensing and in situ instrumentation. Atmospheric Chemistry and Physics, v. 18, n. 10, p. 7001-7017, 2018. DOI: 10.5194/acp-18-7001-2018

    Abstract: This study focuses on the analysis of aerosol hygroscopic growth during the Sierra Nevada Lidar AerOsol Profiling Experiment (SLOPE I) campaign by using the synergy of active and passive remote sensors at the ACTRIS Granada station and in situ instrumentation at a mountain station (Sierra Nevada, SNS). To this end, a methodology based on simultaneous measurements of aerosol profiles from an EARLINET multi-wavelength Raman lidar (RL) and relative humidity (RH) profiles obtained from a multi-instrumental approach is used. This approach is based on the combination of calibrated water vapor mixing ratio (r) profiles from RL and continuous temperature profiles from a microwave radiometer (MWR) for obtaining RH profiles with a reasonable vertical and temporal resolution. This methodology is validated against the traditional one that uses RH from co-located radiosounding (RS) measurements, obtaining differences in the hygroscopic growth parameter (γ) lower than 5 % between the methodology based on RS and the one presented here. Additionally, during the SLOPE I campaign the remote sensing methodology used for aerosol hygroscopic growth studies has been checked against Mie calculations of aerosol hygroscopic growth using in situ measurements of particle number size distribution and submicron chemical composition measured at SNS. The hygroscopic case observed during SLOPE I showed an increase in the particle backscatter coefficient at 355 and 532 nm with relative humidity (RH ranged between 78 and 98 %), but also a decrease in the backscatter-related Ångström exponent (AE) and particle linear depolarization ratio (PLDR), indicating that the particles became larger and more spherical due to hygroscopic processes. Vertical and horizontal wind analysis is performed by means of a co-located Doppler lidar system, in order to evaluate the horizontal and vertical dynamics of the air masses. Finally, the Hänel parameterization is applied to experimental data for both stations, and we found good agreement on γ measured with remote sensing (γ532 = 0.48 ± 0.01 and γ355 = 0.40 ± 0.01) with respect to the values calculated using Mie theory (γ532 = 0.53 ± 0.02 and γ355 = 0.45 ± 0.02), with relative differences between measurements and simulations lower than 9 % at 532 nm and 11 % at 355 nm.

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  • IPEN-DOC 24675

    ALMEIDA, S.B. ; VILLANI, D. ; SAKURABA, R.K.; REZENDE, A.C.P.; CAMPOS, L.L. . TL and OSL dosimetric characterization of different luminescent materials for clinical electron beams application in TSEB treatments. Journal of Luminescence, v. 198, p. 497-501, 2018. DOI: 10.1016/j.jlumin.2018.02.065

    Abstract: Thermoluminescent dosimeters (TLDs) play an important role in radiotherapy for the dosimetry of ionizing radiation. This type of dosimeter presents advantages that makes them a useful tool for measurements in anthropomorphic phantoms and in vivo dosimetry. Several dosimetric materials have been used in the radiotherapy sectors such as LiF, μLiF, CaSO4:Dy. The OSL dosimetry has also been widely applied using Aluminum Oxide (Al2O3:C). These dosimeters have advantages over TLDs due to their high sensitivity, extensive linearity in response to the dose, faster reading, possibility of multiple readings and the need to perform the heat treatment of the samples. The aim of this work was to compare and characterize, using TL and OSL techniques, different luminescent dosimeters (LiF, μLiF, CaSO4:Dy and Al2O3:C) to be applied in clinical electron beam used to TSEB treatments. Measurements were performed in order to study the applicability of these detectors as easy-to-take alternatives to calibration and measurements of TSEB treatments. Parameters such as dose-response curves; average sensitivity to radiation, intrinsic efficiency and energy and angular dependences were evaluated. The results show good agreement within CaSO4:Dy and TLD-100 measurements and, applying energy and angle dependence factors over the other two materials, all the four detectors can be applied as alternative easy-to-take dosimetric tools for commissioning and quality assurance of 6 MeV clinical electron beams used in TSEB treatments.

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  • IPEN-DOC 24674

    POLO, IVON O. ; CALDAS, LINDA V.E. . Determination of transmission factors in beta radiation beams. Applied Radiation and Isotopes, v. 136, p. 82-86, 2018. DOI: 10.1016/j.apradiso.2018.02.010

    Abstract: In beta emitters, in order to evaluate the absorbed dose rate at different tissue depths, it is necessary to determine the transmission factors. In this work, the transmission factors determined in beta secondary standard radiation beams are presented. For this purpose, an extrapolation chamber was used. The results obtained were considered acceptable, and they are within the uncertainties in comparison with the values provided by the source calibration certificate. The maximum differences between the results obtained in this work and those from the calibration certificate were 3.3%, 3.8% and 5.9% for 90Sr/90Y, 85Kr and 147Pm sources respectively.

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  • IPEN-DOC 24673

    COURROL, DANIELLA dos S.; LOPES, CARLA R.B.; CORDEIRO, THIAGO da S. ; FRANZOLIN, MARCIA R.; VIEIRA JUNIOR, NILSON D. ; SAMAD, RICARDO E. ; COURROL, LILIA C.. Optical properties and antimicrobial effects of silver nanoparticles synthesized by femtosecond laser photoreduction. Optics and Laser Technology, v. 103, p. 233-238, 2018. DOI: 10.1016/j.optlastec.2018.01.044

    Abstract: Silver nanoparticles exhibit a powerful antimicrobial action showing a pronounced potential to be widely used against drug resistance bacteria. The present work describes the optical properties and antimicrobial effect of silver nanoparticles produced by femtosecond laser photoreduction of AgNO3 in the presence of tryptophan water solution. The advantages of this method are the absence of hazardous chemical reducing agents in the solution, and the versatile dimensional control achieved. The synthesized silver nanoparticles were characterized by absorption and fluorescence spectroscopy and their antibacterial activity were determined by monitoring the cell viability of Escherichia coli. The effects of the silver nanoparticles concentration and laser parameters (exposure time and pulse energy), on the formation of the nanoparticles, and its influence on the bacteria growth inhibition were studied. The prepared silver nanoparticles exhibited suitable antimicrobial properties. The results demonstrated that the nanoparticles concentration plays an important role in their bactericidal efficacy. The increase in the laser energy caused an increase in E. coli growth inhibition. Irradiations with energies around 300 mu j for 60 min presented high antimicrobial activity due to the presence of kynurenine, sub product of tryptophan photolysis. The first-time formation mechanism of tryptophan silver nanoparticles in high optical intensities was also discussed.

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  • IPEN-DOC 24672

    COURROL, LILIA C.; SAMAD, RICARDO E. . Determination of chicken meat contamination by porphyrin fluorescence. Journal of Luminescence, v. 199, p. 67-70, 2018. DOI: 10.1016/j.jlumin.2018.03.006

    Abstract: Meat quality is normally defined by a combination of factors such as visual appearance, smell, firmness, succulence, tenderness, and flavor. Contamination of poultry meat with pathogens remains an important public health issue since it can cause illnesses due to negligence in handling, cooking or post-cooking storage. Conventionally, meat quality tests are based on visual evaluation or chemical analysis, which have the disadvantages of being subjective and time-consuming. To improve the biological contamination detection accuracy and productivity, the evaluation of porphyrin contents in meat by fluorescence spectroscopy is proposed, considering that most microorganisms and animal cells excrete porphyrins. For this purpose, chicken meat was cut into small pieces and separated in three groups: a control group where the meat was conserved under refrigeration, and two experimental groups in which the pieces were kept for 24 and 30 h at room temperature. Porphyrin was extracted from the meat samples and the fluorescence was measured in the range 550-750 nm, under excitation around 400 nm. The fluorescence lifetime was also studied. To ensure porphyrin synthesis, a concentration of 9.3 mM of delta-Aminolevulinic acid (ALA) was added to each sample, 2 h before porphyrin extraction. The results show that, in meat kept at room temperature and incubated with ALA, the porphyrin fluorescence increased, and a short-lived component was enhanced due to the action of microorganisms, indicating a potential new method to test meat quality.

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  • IPEN-DOC 24671

    PIERETTI, EURICO F. ; COZZA, RONALDO C.; NEVES, MAURICIO D.M. das . Wear evaluation of the ASTM F138 austenitic stainless steel for biomedical applications treated by optical fiber laser. In: WORLD TRIBOLOGY CONGRESS, 6th, September 17-22, 2017, Beijing, China. Resumo expandido... 2017. p. 1-4.

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  • IPEN-DOC 24670

    MERGULHAO, MARCELLO V. ; PODESTA, CARLOS E.; NEVES, MAURICIO D.M. das . Perspective of additive manufacturing selective laser melting in Co-Cr-Mo alloy in the consolidation of dental prosthesis. In: DOBRZAŃSKI, LESZEK A. (Ed.). Biomaterials in Regenerative Medicine. London, UK: IntechOpen, 2018. p. 161-185, cap. 6. DOI: 10.5772/intechopen.69720

    Abstract: This chapter seeks to compare the properties of samples manufactured by additive manufacturing (AM) by the selective laser melting (SLM) technology and compare with the precision casting (PC) processes using the Co-Cr-Mo (ASTM F75) alloy to manufacture of dental prosthesis. This AM process can be manufactured three-dimensional models by means of a laser beam that completely melts particles of powder deposited layer by layer. However, it is still relevant to know the properties of: performance, dimensional, mechanical and microstructural of this laser melting process and compare with a convencional process. The results of mechanical evaluation showed that the SLM technique provides superior mechanical properties compared to those obtained by the PC technique. It is possible to verify that the consolidation by SLM technique results in lower presence of porosity than PC technique. In addition, PC samples presented a gross dendritic microstructure of casting process. Microstructural analysis of SLM samples results in a characteristic morphology of layer manufacturing with ultrafine grains and a high chemical homogeneity. In this way, the development of the present study evidenced to improve the manufacture of customized components (copings) using the SLM technology.

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  • IPEN-DOC 24669

    MERGULHAO, MARCELLO V. ; PODESTA, CARLOS E.; NEVES, MAURICIO D.M. das . Investigation of mechanical, microstructural and thermal behavior of CoCrMo alloy manufactured by selective laser melting and casting techniques. In: CONGRESSO BRASILEIRO DE ENGENHARIA DE FABRICACAO, 9., 26-29 de junho, 2017, Joinville, SC. Anais... Rio de Janeiro, RJ: Associação Brasileira de Engenharia e Ciências Mecânicas, 2017.

    Abstract: A route of increasing development in additive manufacturing (3D printing) process using metal alloys is the selective laser melting (SLM). 3D building components is possible by laser power that completely melts the metal powder particles. SLM was applied in a biomaterial of CoCrMo alloy, to study the mechanical properties and microstructural characterization in comparison of the conventional technique – lost wax casting. The gas atomized powder was investigated by their physical (as apparent density, bulk density and flow rate) and chemical properties (X-ray fluorescence). Standard samples evaluated the mechanical properties as yield strength, elongation, elastic modulus, transverse rupture strength and the Vickers hardness. Microstructural characterization was performed using optical microscope (OM) and scanning electron microscope (SEM-EDS). Thermal analysis of CoCrMo alloy were investigated using thermomechanical analysis (TMA) and differential scanning calorimetry (DSC) techniques. The results of mechanical properties showed higher values in the SLM specimens compared with the obtained in the cast specimens. The micrographs revealed a typical morphology of consolidation process, characterized by selected layer used in the SLM technique and the dendrites arms in the casting technique. The thermal results confirm the phase’s transitions of CoCrMo alloy.

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  • IPEN-DOC 24668

    MERGULHAO, MARCELLO V. ; NEVES, MAURICIO D.M. das . Characteristics of biometallic alloy to additive manufacturing using selective laser melting technology. Journal of Biomaterials and Nanobiotechnology, v. 9, n. 1, p. 89-99, 2018. DOI: 10.4236/jbnb.2018.91008

    Abstract: Biomaterial powders are in high development due to expansion of additive manufacturing (AM) processes. Selective laser melting (SLM) is a particular AM technology, which completely melts a powder bed layer by laser beam. Investigations of appropriated physical properties of feedstock (powder alloy) were the aim of this study. Cobalt-chromium-molybdenum (Co-Cr-Mo) alloy was used to overview of gas-atomized powder properties in different granulometric ranges (D1 12 - 19 μm, D2 20 - 46 μm and D3 76 - 106 μm), as their: physical, chemical properties and thermal analysis. SLM manufactured standard tensile specimens of usually granulometric range powder size provided mechanical, chemical and thermal properties of biocompatible Co-Cr-Mo alloy. The physical properties showed that powders in the range of 20 to 50 μm provide a better flow ability and packed density, which are relevant characteristics to SLM processing. Manufacturing by SLM process provided suitable mechanical properties in the health area, as well as, maintained the biocompatible properties of the Co-Cr-Mo alloy.

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  • IPEN-DOC 24667

    BARROS FILHO, ERALDO C.; SENE, FRANK F.; MARTINELLI, JOSE R. . Avaliação das propriedades físicas e químicas de vidros aluminossilicatos contendo hólmio. Boletim Técnico da Faculdade de Tecnologia de São Paulo, v. 43, p. 1-4, 2017.

    Abstract: O tratamento do carcinoma hepatocelular ou câncer de fígado primário é um desafio terapêutico. Uma vez que o crescimento dos nódulos ocorre de modo lento e assintomático, levando a um diagnóstico tardio, somente 10 a 15% dos pacientes são elegíveis aos métodos de tratamento convencional, tais como a cirurgia. Tratamentos alternativos são necessários para os pacientes inoperáveis e a radioterapia interna seletiva é uma opção. Nesta terapia, microesferas contendo um radionuclídeo em sua estrutura são inseridas por meio de um cateter na artéria hepática e migram até o fígado, apresando-se nas arteríolas que alimentam o tumor. As células cancerosas são aniquiladas devido ao bloqueio da alimentação e à deposição de dose de radiação. Neste trabalho, foram produzidos vidros aluminossilicatos contendo hólmio para produção de microesferas para esta aplicação e foram avaliadas as propriedades físicas e químicas dos vidros obtidos visando à aplicação em radioterapia interna seletiva.

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  • IPEN-DOC 24666

    ARAUJO, INGRID G. de; DENALDI, RAFAEL L. ; CARVALHO, GUSTAVO P. de; MARTINS, CEZAR S.. Magnetoimpedância gigante e susceptibilidade por efeito Kerr magneto-óptico em fitas amorfas de CoFeSiB. In: SIMPOSIO DE INICIACAO CIENTIFICA E TECNOLOGICA, 19. BOLETIM TECNICO DA FACULDADE DE TECNOLOGIA DE SAO PAULO, 04-05 de outubro, 2017, São Paulo, SP. Resumo... São Paulo: Faculdade de Tecnologia de São Paulo, 2017. p. 36-36.

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  • IPEN-DOC 24665

    SILVA, CAIO A.J. da ; BERBEL, LARISSA O. ; LEITE, ANTONIO M. dos S. ; COSTA, ISOLDA . Estudo da resistência à corrosão por pite e frestas do aço inoxidável AISI 444. In: SIMPOSIO DE INICIACAO CIENTIFICA E TECNOLOGICA, 19. BOLETIM TECNICO DA FACULDADE DE TECNOLOGIA DE SAO PAULO, 04-05 de outubro, 2017, São Paulo, SP. Resumo... São Paulo: Faculdade de Tecnologia de São Paulo, 2017. p. 31-31.

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  • IPEN-DOC 24664

    SANTANA, JULYANA ; SEIXAS, MARCUS V. de S.; RANGARI, VIJAY; VALENZUELA-DIAZ, FRANCISCO; WIEBECK, HELIO; MOURA, ESPERIDIANA . Influence of electron-beam irradiation on the properties of LDPE/EDPM blend foams. In: LI, BOWEN (Ed.); LI, JIAN (Ed.); IKHMAYIES, SHADIA (Ed.); ZHANG, MINGMING (Ed.); KALAY, YUNUS E. (Ed.); CARPENTER, JOHN S. (Ed.); HWANG, JIANN-YANG (Ed.); MONTEIRO, SERGIO N. (Ed.); FIRRAO, DONATO (Ed.); BROWN, ANDREW (Ed.); BAI, CHENGUANG (Ed.); PENG, ZHIWEI (Ed.); ESCOBEDO-DIAZ, JUAN P. (Ed.); GOSWAMI, RAMASIS (Ed.); KIM, JEONGGUK (Ed.). Characterization of Minerals, Metals, and Materials. TMS. Cham, CZ, Switzerland: Springer International Publishing AG, 2018. p. 547-555, (The Minerals, Metals & Materials Series). DOI: 10.1007/978-3-319-72484-3_58

    Abstract: Closed-cell polyethylene (PE) foams have been extensively used in many applications such as packaging, transportation, sports, construction, and agriculture because of their variety of properties including light weight, chemical resistance, thermal and electrical insulation. The objective of this study is to evaluate the influence of electron-beam irradiation on the properties of LDPE/EPDM blend foams. The LDPE/EPDM blend (80/20 wt%) were prepared by melt extrusion, using a twin-screw extruder machine. The foam structure of LDPE/EPDM blends was obtained by melt extrusion process, using a special single screw for foaming with 1.5 wt% of foaming agent as blowing agent. The foam samples were irradiated by electron-beam at radiation dose of 25, 50, 75 and 100 kGy and submitted to heating in an oven at 100 °C. The specimen tests samples of irradiated and non-irradiated foams were submitted to mechanical tests, DSC, TG analysis and density measurement.

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  • IPEN-DOC 24663

    ARANTES, MARIANA M. ; SANTANA, JULYANA ; VALENZUELA-DIAZ, F.R.; RANGARI, VIJAY K.; GUVEN, OLGUN; MOURA, ESPERIDIANA A.B. . Development and characterization of recycled-HDPE/EVA foam reinforced with babassu coconut epicarp fiber residues. In: LI, BOWEN (Ed.); LI, JIAN (Ed.); IKHMAYIES, SHADIA (Ed.); ZHANG, MINGMING (Ed.); KALAY, YUNUS E. (Ed.); CARPENTER, JOHN S. (Ed.); HWANG, JIANN-YANG (Ed.); MONTEIRO, SERGIO N. (Ed.); FIRRAO, DONATO (Ed.); BROWN, ANDREW (Ed.); BAI, CHENGUANG (Ed.); PENG, ZHIWEI (Ed.); ESCOBEDO-DIAZ, JUAN P. (Ed.); GOSWAMI, RAMASIS (Ed.); KIM, JEONGGUK (Ed.). Characterization of Minerals, Metals, and Materials. TMS. Cham, CZ, Switzerland: Springer International Publishing AG, 2018. p. 497-506, (The Minerals, Metals & Materials Series). DOI: 10.1007/978-3-319-72484-3_52

    Abstract: Nowadays, the development of polymeric materials reinforced with residues of vegetal fibers is becoming popular for application in different segments, from the automotive to the civil construction and furniture industry. Vegetal fiber residues may be used as reinforcement of the recycled polymer materials, for instance, to produce foams to packaging or to thermal and acoustic isolation for green building application. This work is focused on the development and characterization of recycled-HDPE/EVA foam reinforced with fiber residues from babassu coconut epicarp. Firstly, composites based on recycled-HDPE/EVA blend reinforced with babassu coconut fiber were obtained by melting extrusion process. The composites were then extruded in a special single screw for foaming. The foam samples were submitted to mechanical tests, density measurement, DSC, TG, and FE-SEM analysis.

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  • IPEN-DOC 24662

    FRANCISCO, DANAE L.; PAIVA, LUCILENE B. de; ALDEIA, WAGNER; LUGAO, ADEMAR B. ; MOURA, ESPERIDIANA A.B. . Characterization of non-covalently functionalized halloysite. In: LI, BOWEN (Ed.); LI, JIAN (Ed.); IKHMAYIES, SHADIA (Ed.); ZHANG, MINGMING (Ed.); KALAY, YUNUS E. (Ed.); CARPENTER, JOHN S. (Ed.); HWANG, JIANN-YANG (Ed.); MONTEIRO, SERGIO N. (Ed.); FIRRAO, DONATO (Ed.); BROWN, ANDREW (Ed.); BAI, CHENGUANG (Ed.); PENG, ZHIWEI (Ed.); ESCOBEDO-DIAZ, JUAN P. (Ed.); GOSWAMI, RAMASIS (Ed.); KIM, JEONGGUK (Ed.). Characterization of Minerals, Metals, and Materials. TMS. Cham, CZ, Switzerland: Springer International Publishing AG, 2018. p. 317-323, (The Minerals, Metals & Materials Series). DOI: 10.1007/978-3-319-72484-3_34

    Abstract: The inorganic nanotube halloysite (HNT) is a promising type of natural occurring filler for polymers. Its characteristics, such as high aspect ratio (10–50), small size, and high strength (elastic modulus—140 GPa) suggest that HNTs have a potential use in high-performance polymer nanocomposites. Compared to other nanoclays and nanosilica the relatively low content of hydroxyl groups on their surfaces makes HNTs relatively hydrophobic, although, sometimes, this is not sufficient for guaranty a good interfacial adhesion in composite systems. Further hydrophobic treatment is required to improve HNTs compatibility with polymer matrixes, maximizing interfacial interactions. In the present study, different percentages of EPB (2,2-(1,2-ethene diyldi-4,1-phenylene) bisbenzoxazole) was used to perform a non-covalent functionalization of halloysite, based on electron transfer interactions. The functionalization is characterized by specific surface area (BET), thermogravimetric analysis (TG) and water/toluene extraction experiment.

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  • IPEN-DOC 24661

    OIDE, MARIANE Y.T.; SATANA, JULYANA ; WELLEN, RENATE; VALENZUELA-DIAZ, FRANCISCO; GUVEN, OLGUN; MOURA, ESPERIDIANA . The influence of clay reinforcement on the properties of recycled polymer foams. In: LI, BOWEN (Ed.); LI, JIAN (Ed.); IKHMAYIES, SHADIA (Ed.); ZHANG, MINGMING (Ed.); KALAY, YUNUS E. (Ed.); CARPENTER, JOHN S. (Ed.); HWANG, JIANN-YANG (Ed.); MONTEIRO, SERGIO N. (Ed.); FIRRAO, DONATO (Ed.); BROWN, ANDREW (Ed.); BAI, CHENGUANG (Ed.); PENG, ZHIWEI (Ed.); ESCOBEDO-DIAZ, JUAN P. (Ed.); GOSWAMI, RAMASIS (Ed.); KIM, JEONGGUK (Ed.). Characterization of Minerals, Metals, and Materials. TMS. Cham, CZ, Switzerland: Springer International Publishing AG, 2018. p. 703-712, (The Minerals, Metals & Materials Series). DOI: 10.1007/978-3-319-72484-3_75

    Abstract: Poly [(ethylene)-co-(vinyl acetate)] (EVA) is a thermoplastic copolymer composed of randomly distributed polyethylene and polyvinyl acetate sequences within the molecular chain. EVA combines toughness with excellent flexibility, impact and puncture resistance. Because of these properties, this material is largely used for foam production as padding in equipment for various sports and as a shock absorber in sport’s shoes. This work aims to study the influence of clay reinforcement on the performance of recycled polymer foams. The blend containing recycled HDPE (high density polyethylene) and recycled EVA (70/30 wt%, respectively) reinforced with 2 wt% of clays were prepared by melt extrusion, using a twin-screw extruder to obtain the composites. The composites and foaming agent were fed into a special single screw extruder for foaming. The samples of HDPE/EVA/Clay foams were characterized by tensile test, Field Emission Scanning Electron Microscopy (FE-SEM), Thermogravimetric Analysis (TG), Differential Scanning Calorimetry (DSC), X-ray Diffraction (XRD), density measurement and the correlation between the results was evaluated.

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  • IPEN-DOC 24660

    POVEDA, PATRICIA N.S. ; MOLARI, JULIANA A.; BRUNELLI, DEBORAH D.; SILVA, LEONARDO G.A. e . Study of different process additives applied to polypropylene. In: LI, BOWEN (Ed.); LI, JIAN (Ed.); IKHMAYIES, SHADIA (Ed.); ZHANG, MINGMING (Ed.); KALAY, YUNUS E. (Ed.); CARPENTER, JOHN S. (Ed.); HWANG, JIANN-YANG (Ed.); MONTEIRO, SERGIO N. (Ed.); FIRRAO, DONATO (Ed.); BROWN, ANDREW (Ed.); BAI, CHENGUANG (Ed.); PENG, ZHIWEI (Ed.); ESCOBEDO-DIAZ, JUAN P. (Ed.); GOSWAMI, RAMASIS (Ed.); KIM, JEONGGUK (Ed.). Characterization of Minerals, Metals, and Materials. TMS. Cham, CZ, Switzerland: Springer International Publishing AG, 2018. p. 661-667, (The Minerals, Metals & Materials Series). DOI: 10.1007/978-3-319-72484-3_70

    Abstract: There are several additives aimed on improving the processing characteristics as well as mechanical properties of the plastic materials. Being polypropylene is one of the main polymers used in the plastic processing industry due to its easy processability and application versatility, was chosen as the base resin for this study. Additives can aid the processing of polypropylene, either by promoting a better slip between the chains (lubricants), or by contributing to nucleation and crystallinity (nucleating). In this study, the raw materials copolymer polypropylene, lubricant (internal and external action), organic nucleating agent (metallic salt) and inorganic nucleating agent (metallic oxide) were considered. Mechanical tensile tests, Charpy impact and spiral flow to verify melt index were performed to characterize the samples with additives and standard (copolymer polypropylene). The interference of these additives with polymeric matrix was observed.

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  • IPEN-DOC 24659

    MESQUITA, ANDERSON dos S. ; SILVA, LEONARDO G. de A. e ; MIRANDA, LEILA F. de. Mechanical, thermal and electrical properties of polymer (Ethylene Terephthalate—PET) filled with carbon black. In: LI, BOWEN (Ed.); LI, JIAN (Ed.); IKHMAYIES, SHADIA (Ed.); ZHANG, MINGMING (Ed.); KALAY, YUNUS E. (Ed.); CARPENTER, JOHN S. (Ed.); HWANG, JIANN-YANG (Ed.); MONTEIRO, SERGIO N. (Ed.); FIRRAO, DONATO (Ed.); BROWN, ANDREW (Ed.); BAI, CHENGUANG (Ed.); PENG, ZHIWEI (Ed.); ESCOBEDO-DIAZ, JUAN P. (Ed.); GOSWAMI, RAMASIS (Ed.); KIM, JEONGGUK (Ed.). Characterization of Minerals, Metals, and Materials. TMS. Cham, CZ, Switzerland: Springer International Publishing AG, 2018. p. 605-614, (The Minerals, Metals & Materials Series). DOI: 10.1007/978-3-319-72484-3_64

    Abstract: This work seeks to understand if PET compounds with carbon black can be uses to replace polypropylene and polystyrene for anti-static packaging materials. PET compounds were fabricated containing 10.0; 11.0; 12.0 and 15.0 weight % of carbon black with a particle size 325 mesh. We determined the thermomechanical properties (Dynamic Mechanical Analysis—DMA, Tensile Properties, Fracture Toughness, and Hardness) and Electrical properties of the compounds. In conclusion the results show the compound based on PET filled with 15.0% carbon black might be used in the handling, transportation and storage of electronic components because their mechanical properties, thermal and resistivity are satisfactory for this purpose.

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  • IPEN-DOC 24658

    OLIANI, WASHINGTON L. ; PARRA, DUCLERC F. ; RANGARI, VIJAYA K.; LINCOPAN, NILTON; LUGAO, ADEMAR B. . Irradiation influence on the properties of HMS-Polypropylene Clay/AgNPs nanocomposites. In: LI, BOWEN (Ed.); LI, JIAN (Ed.); IKHMAYIES, SHADIA (Ed.); ZHANG, MINGMING (Ed.); KALAY, YUNUS E. (Ed.); CARPENTER, JOHN S. (Ed.); HWANG, JIANN-YANG (Ed.); MONTEIRO, SERGIO N. (Ed.); FIRRAO, DONATO (Ed.); BROWN, ANDREW (Ed.); BAI, CHENGUANG (Ed.); PENG, ZHIWEI (Ed.); ESCOBEDO-DIAZ, JUAN P. (Ed.); GOSWAMI, RAMASIS (Ed.); KIM, JEONGGUK (Ed.). Characterization of Minerals, Metals, and Materials. TMS. Cham, CZ, Switzerland: Springer International Publishing AG, 2018. p. 583-595, (The Minerals, Metals & Materials Series). DOI: 10.1007/978-3-319-72484-3_62

    Abstract: Due to its versatility and low cost, polypropylene (PP) is one of the most widely used polymers in the world, consequently in research and development of new products. The polypropylene modified was prepared by gamma irradiation in acetylene at 12.5 kGy dose, technical polymer also known as high-melt-strength-polypropylene (HMSPP). It was mixed with montmorillonite (MMT) clay and silver nanoparticles (AgNPs) for bactericide activity. HMS-Polypropylene-clay -silver nanocomposites were manufactured using twin-screw extruders. Those materials were prepared by a melt mixing process via twin screw extrusion with a wide range of processing conditions. The polypropylene nanocomposites (PPNC) surfaces were exposed to gamma-radiation (60Co) source in presence of nitrogen as inert atmosphere at 1; 3; 5; 10; 20 and 50 kGy doses for modified the surfaces in order to enhance biocide activity. The samples surfaces were characterized by Differential Scanning Calorimetry (DSC), X-ray Diffraction (XRD), Thermogravimetric Analysis (TGA), Scanning Electron Microscopy (SEM), Energy Dispersive Spectroscopy (EDX) and evaluated by determination of bactericide effects. The results indicate the formation of structures predominantly intercalated of HMSPP nanocomposite. Contact tests for antibacterial activity of the hybrid polymer were applied against Escherichia coli (Gram-negative) and Staphylococcus aureus (Gram-positive) bacteria. The irradiations on the samples surfaces were insufficient to promote activity on contact biocide tests.

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  • IPEN-DOC 24657

    ZAFALON, ANGELICA T. ; SANTOS, VINICIUS J. dos ; ESPOSITO, FERNANDA; LINCOPAN, NILTON; RANGARI, VIJAYA; LUGAO, ADEMAR B. ; PARRA, DUCLERC F. . Synthesis of polymeric hydrogel loaded with antibiotic drug for wound healing applications. In: LI, BOWEN (Ed.); LI, JIAN (Ed.); IKHMAYIES, SHADIA (Ed.); ZHANG, MINGMING (Ed.); KALAY, YUNUS E. (Ed.); CARPENTER, JOHN S. (Ed.); HWANG, JIANN-YANG (Ed.); MONTEIRO, SERGIO N. (Ed.); FIRRAO, DONATO (Ed.); BROWN, ANDREW (Ed.); BAI, CHENGUANG (Ed.); PENG, ZHIWEI (Ed.); ESCOBEDO-DIAZ, JUAN P. (Ed.); GOSWAMI, RAMASIS (Ed.); KIM, JEONGGUK (Ed.). Characterization of Minerals, Metals, and Materials. TMS. Cham, CZ, Switzerland: Springer International Publishing AG., 2018. p. 165-176, (The Minerals, Metals & Materials Series). DOI: 10.1007/978-3-319-72484-3_18

    Abstract: Polymeric hydrogels are natural or synthetic systems, which have gained interest due to their high biocompatibility with soft tissues. These types of hydrogels have been used for wound dressing as a drug delivery system. Here in this study the polymeric hydrogels based wound healing systems were prepared using poly (N-vinyl-2-pyrrolidone) (PVP), poly (ethylene glycol) (PEG), agar and neomycin drug followed by gamma irradiation to promote crosslinking and sterilization. The influence of irradiation process with 25 kGy dose was investigated. The gel fraction and maximum swelling were estimated using physicochemical methods and found about 95% gel fraction and 1100% swelling after 8 h of immersion. Neomycin released from hydrogel was carried out by Liquid Chromatography-Mass Spectrometry method and the drug concentration remained constant for 48 h. Hydrogel/neomycin exhibited antibacterial effects against Staphylococcus aureus. With these results, it can be inferred that hydrogel/neomycin is a suitable candidate for wound dressing.

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  • IPEN-DOC 24656

    YAMAGUCHI, MITSUO . Análise de Criticalidade do Cofre de Salvaguardas (Sala 21) do Prédio 96 do Centro de Combustível Nuclear (CCN). São Paulo, SP: Instituto de Pesquisas Energéticas e Nucleares - CEN, Janeiro, 2018. (IPEN-CEN-PSE-CCN-007-00-RELT-001-01). Restrito.

    Título do projeto: Prestação de Serviços Tecnológicos

    Abstract: Este relatório apresenta a análise de criticalidade do cofre de salvaguardas (sala 21 do prédio 96) do Centro de Combustível Nuclear (CCN) para armazenamento das placas combustíveis e/ou elementos combustíveis do núcleo de placas do Reator IPEN/MB-01. A análise foi feita com o sistema SCALE4.4a.

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  • IPEN-DOC 24285

    MIRANDA, CARLOS A. de J. ; MATTAR NETO, MIGUEL . Apoio à DRS – Angra 3 – PT – Prédio UJB-UJE acima da cota +28.15m e Colunas. São Paulo, SP: Instituto de Pesquisas Energéticas e Nucleares - CEN, Janeiro, 2018. (IPEN-CEN-PSE-DRS-012-00-RELT-001-00). Restrito.

    Título do projeto: Prestação de Serviços Tecnológicos

    Abstract: Neste relatório apresenta-se o texto do Parecer Técnico encaminhado ao GT-Civil da DRS para revisão dos seus demais membros, que embasará a autorização da DRS à continuidade das obras no Prédio (ou parte do) UJB-UJE acima da cota 28,15m, da usina de Angra 3.

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  • IPEN-DOC 24284

    MIRANDA, CARLOS A. de J. ; MATTAR NETO, MIGUEL . Apoio à DRS – Angra 3 – PT – Caixas de Passagem de Tubulação do PEB 1–5UPX. São Paulo, SP: Instituto de Pesquisas Energéticas e Nucleares - CEN, Janeiro, 2018. (IPEN-CEN-PSE-DRS-012-00-RELT-002-00). Restrito.

    Título do projeto: Prestação de Serviços Tecnológicos

    Abstract: Neste relatório apresenta-se o texto do Parecer Técnico encaminhado ao GT-Civil da DRS para revisão dos seus demais membros, que embasará a autorização da DRS à continuidade das obras das Caixas de Passagem de Tubulação do PEB 1-5UPX, da usina de Angra 3.

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  • IPEN-DOC 24283

    MIRANDA, CARLOS A. de J. ; MATTAR NETO, MIGUEL . Apoio à DRS – Angra 3 – PT – Câmara de Compensação de Água de Serviço para o PEB - UQZ. São Paulo, SP: Instituto de Pesquisas Energéticas e Nucleares - CEN, Janeiro, 2018. (IPEN-CEN-PSE-DRS-012-00-RELT-003-00). Restrito.

    Título do projeto: Prestação de Serviços Tecnológicos

    Abstract: Neste relatório apresenta-se o texto do Parecer Técnico encaminhado ao GT-Civil da DRS para revisão dos seus demais membros, que embasará a autorização da DRS à continuidade das obras (concretagem) da Câmara de Compensação de Água de Serviço para o PEB 4UQZ, da usina de Angra 3.

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  • IPEN-DOC 24282

    MIRANDA, CARLOS A. de J. ; MATTAR NETO, MIGUEL . Apoio à DRS – Angra 3 – PT – Caixa de Coleta de Água de Serviço - UQM. São Paulo, SP: Instituto de Pesquisas Energéticas e Nucleares - CEN, Janeiro, 2018. (IPEN-CEN-PSE-DRS-012-00-RELT-004-00). Restrito.

    Título do projeto: Prestação de Serviços Tecnológicos

    Abstract: Neste relatório apresenta-se o texto do Parecer Técnico encaminhado ao GT-Civil da DRS para revisão dos seus demais membros, que embasará a autorização da DRS à continuidade das obras (concretagem) da Caixa de Coleta de Água do Sistema de Água de Serviço - UQM, da usina de Angra 3.

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  • IPEN-DOC 24281

    MIRANDA, CARLOS A. de J. ; MATTAR NETO, MIGUEL . Apoio à DRS – Angra 3 – PT – Caixas de Passagem de Cabos - UBS. São Paulo, SP: Instituto de Pesquisas Energéticas e Nucleares - CEN, Janeiro, 2018. (IPEN-CEN-PSE-DRS-012-00-RELT-005-00). Restrito.

    Título do projeto: Prestação de Serviços Tecnológicos

    Abstract: Neste relatório apresenta-se o texto do Parecer Técnico encaminhado ao GT-Civil da DRS para revisão dos seus demais membros, que embasará a autorização da DRS à continuidade das obras (concretagem) das Caixas de Passagem de Cabos – UBS (nominalmente identificadas no item 1), da usina de Angra 3.

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  • IPEN-DOC 24280

    MIRANDA, CARLOS A. de J. ; MATTAR NETO, MIGUEL . Apoio à DRS – Angra 3 – PT – Edifício Auxiliar do Reator - UKA. São Paulo, SP: Instituto de Pesquisas Energéticas e Nucleares - CEN, Janeiro, 2018. (IPEN-CEN-PSE-DRS-012-00-RELT-006-00). Restrito.

    Título do projeto: Prestação de Serviços Tecnológicos

    Abstract: Neste relatório apresenta-se o texto do Parecer Técnico encaminhado ao GT-Civil da DRS para revisão dos seus demais membros, que embasará a autorização da DRS à continuidade das obras (concretagem) do Edifício Auxiliar do Reator – UKA, da usina de Angra 3.

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  • IPEN-DOC 24279

    MIRANDA, CARLOS A. de J. ; MATTAR NETO, MIGUEL . Apoio à DRS – Angra 3 – PT – Edifício de Tomada de Água de Refrigeração – UPC/1+2UQB. São Paulo, SP: Instituto de Pesquisas Energéticas e Nucleares - CEN, Janeiro, 2018. (IPEN-CEN-PSE-DRS-012-00-RELT-007-00). Restrito.

    Título do projeto: Prestação de Serviços Tecnológicos

    Abstract: Neste relatório apresenta-se o texto do Parecer Técnico encaminhado ao GT-Civil da DRS para revisão dos seus demais membros, que embasará a autorização da DRS à continuidade das obras (concretagem) do Edifício de Tomada d’Água de Refrigeração - UPC/1+2UQB (Entre os Níveis -2,00m e +9,05m), da usina de Angra 3.

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  • IPEN-DOC 24388

    DIAS, M.S. ; SEMMLER, R. ; MOREIRA, D.S. ; MENEZES, M.O. de ; BARROS, L.F. ; RIBEIRO, R.V.; KOSKINAS, M.F. . SUMCOR: cascade summing correction for volumetric sources applying MCNP6. Applied Radiation and Isotopes, v. 134, n. SI, p. 205-211, 2018. DOI: 10.1016/j.apradiso.2017.09.014

    Abstract: The main features of code SUMCOR developed for cascade summing correction for volumetric sources are described. MCNP6 is used to track histories starting from individual points inside the volumetric source, for each set of cascade transitions from the radionuclide. Total and FEP efficiencies are calculated for all gamma-rays and X-rays involved in the cascade. Cascade summing correction is based on the matrix formalism developed by Semkow et al. (1990). Results are presented applying the experimental data sent to the participants of two intercomparisons organized by the ICRM-GSWG and coordinated by Dr. Marie-Cristine Lepy from the Laboratoire National Henri Becquerel (LNE-LNHB), CEA, in 2008 and 2010, respectively and compared to the other participants in the intercomparisons.

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  • IPEN-DOC 24365

    OLIVEIRA, A.E. de; IWAHARA, A.; CRUZ, P.A.L. da; SILVA, C.J. da; ARAUJO, E.B. de ; MENGATTI, J. ; SILVA, R.L. da; TRINDADE, O.L.. Rapid and accurate assessment of the activity measurements in Brazilian hospitals and clinics. Applied Radiation and Isotopes, v. 134, n. SI, p. 64-67, 2018. DOI: 10.1016/j.apradiso.2017.07.065

    Abstract: Traceability in Nuclear Medicine Service (NMS) measurements was checked by the Institute of Radioprotection and Dosimetry (IRD) through the Institute of Energy and Nuclear Research (IPEN). In 2016, IRD ran an inter comparison program and invited Brazilian NMS authorized to administer I-131 to patients. Sources of I-131 were distributed to 33 NMSs. Three other sources from the same solution were sent to IRD, after measurement at IPEN. These sources were calibrated in the IRD reference system. A correction factor of 1.013 was obtained. Ninety percent of the NMS comparisons results are within +/- 10% of the National Laboratory of Metrology of Ionizing Radiation (LNMRI) value, the Brazilian legal requirement.

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  • IPEN-DOC 24367

    REIS, S.L. ; MUCCILLO, E.N.S. . Influence of small amounts of gallium oxide addition on ionic conductivity of La0.9Sr0.1Ga0.8Mg0.2O3-δ solid electrolyte. Ceramics International, v. 44, n. 1, p. 115-119, 2018. DOI: 10.1016/j.ceramint.2017.09.139

    Abstract: The effects of small amounts of gallium oxide on intragrain and intergrain conductivity of La0.9Sr0.1Ga0.8Mg0.2O3-δ are investigated by impedance spectroscopy in the 280–420 °C range. Bulk specimens with 0.5, 1.0 and 1.5 mol% gallium oxide are prepared by solid state reaction at 1350 °C. All specimens achieved relative density values higher than 95%. The additive promotes grain growth indicating solid solution formation. A small fraction of the additive remains at grain boundaries and increases the fraction of the gallium-rich, LaSrGa3O7, impurity phase. The intragrain conductivity of gallium oxide containing specimens is higher than that of the parent solid electrolyte. Similar effect is found for the intergrain conductivity, which is maximum for 1 mol% gallium oxide addition.

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  • IPEN-DOC 24324

    BARBIERO, LAURENT; SIQUEIRA NETO, MARCOS; BRAZ, ROSANGELA R.; CARMO, JANAINA B. do; REZENDE FILHO, ARY T.; MAZZI, EDMAR; FERNANDES, FERNANDO A.; DAMATTO, SANDRA R. ; CAMARGO, PLINIO B. de. Biogeochemical diversity, O2-supersaturation and hot moments of GHG emissions from shallow alkaline lakes in the Pantanal of Nhecolândia, Brazil. Science of the Total Environment, v. 619-620, p. 1420-1430, 2018. DOI: 10.1016/j.scitotenv.2017.11.197

    Abstract: Nhecolândia is a vast sub-region of the Pantanal wetland in Brazil with great diversity in surface water chemistry evolving in a sodic alkaline pathway under the influence of evaporation. In this region, > 15,000 shallow lakes are likely to contribute an enormous quantity of greenhouse gas to the atmosphere, but the diversity of the biogeochemical scenarios and their variability in time and space is a major challenge to estimate the regional contribution. From 4 selected alkaline lakes, we compiled measurements of the physico-chemical characteristics of water and sediments, gas fluxes in floating chambers, and sedimentation rates to illustrate this diversity. Although these lakes have a similar chemical composition, the results confirm a difference between the black-water and green-water alkaline lakes, corresponding to distinct biogeochemical functioning. This difference does not appear to affect lake sedimentation rates, but is reflected in gas emissions. Black-water lakes are CO2 and CH4 sources, with fairly constant emissions throughout the seasons. Annual carbon dioxide and methane emissions approach 0.86 mol m− 2 y− 1 and 0.07 mol m− 2 y− 1, respectively, and no clear trend towards N2O capture or emission was observed. By contrast, green-water lakes are CO2 and N2O sinks but important CH4 sources with fluxes varying significantly throughout the seasons, depending on the magnitude of the phytoplankton bloom. The results highlight important daily and seasonal variations in gas fluxes, and in particular a hot moments for methane emissions, when the O2-supersaturation is reached during the afternoon under extreme bloom and sunny weather conditions, provoking an abrupt O2 purging of the lakes. Taking into account the seasonal variability, annual methane emissions are around 10.2 mol m− 2 y− 1, i.e., much higher than reported in previous studies for alkaline lakes in Nhecolândia. Carbon dioxide and nitrous oxide consumption is estimated about 1.9 mol m− 2 y− 1 and 0.73 mmol m− 2 y− 1, respectively. However, these balances must be better constrained with systematic and targeted measurements throughout the seasons.

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  • IPEN-DOC 24325

    DOMIENIKAN, C. ; BOSCH-SANTOS, B. ; CABRERA-PASCA, G.A.; SAXENA, R.N. ; CARBONARI, A.W. . Anomalous behavior of the magnetic hyperfine field at 140Ce impurities at La sites in LaMnSi2. AIP Advances, v. 8, n. 5, p. 055702-1 - 055702-6, 2018. DOI: 10.1063/1.5006897

    Abstract: Magnetic hyperfine field has been measured in the orthorhombic intermetallic compound LaMnSi2 with perturbed angular correlation (PAC) spectroscopy using radioactive 140La(140Ce) nuclear probes. Magnetization measurements were also carried out in this compound with MPSM-SQUID magnetometer. Samples of LaMnSi2 compound were prepared by arc melting the component metals with high purity under argon atmosphere followed by annealing at 1000°C for 60 h under helium atmosphere and quenching in water. X-ray analysis confirmed the samples to be in a single phase with correct crystal structure expected for LaMnSi2 compound. The radioactive 140La (T1/2 = 40 h) nuclei were produced by direct irradiation of the sample with neutrons in the IEA-R1 nuclear research reactor at IPEN with a flux of ∼ 1013 n cm−2s−1 for about 3 - 4 min. The PAC measurements were carried out with a six BaF2 detector spectrometer at several temperatures between 10 K and 400 K. Temperature dependence of the hyperfine field, Bhf was found to be anomalous. A modified two-state model explained this anomalous behavior where the effective magnetic hyperfine field at 140Ce is believed to have two contributions, one from the unstable localized spins at Ce impurities and another from the magnetic Mn atoms of the host. The competition of these two contributions explains the anomalous behavior observed for the temperature dependence of the magnetic hyperfine field at 140Ce. The ferromagnetic transition temperature (TC) of LaMnSi2 was determined to be 400(1) K confirming the magnetic measurements.

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  • IPEN-DOC 24326

    MUCCILLO, ELIANA N.S. ; CARVALHO, SABRINA G.M.; MUCCILLO, REGINALDO . Electric field-assisted pressureless sintering of zirconia–scandia–ceria solid electrolytes. Journal of Materials Science, v. 53, p. 1658-1671, 2018. DOI: 10.1007/s10853-017-1615-3

    Abstract: Electric field-assisted (flash) pressureless sintering experiments were carried out in ZrO2 ceramics doped with 10 mol% Sc2O3 and 1 mol% CeO2 (10Sc1CeSZ). All experiments were conducted isothermally at 1050 °C for 2–5 min with the application of a 100–150 V cm−1 AC electric field at 1 kHz with 1–4 A limiting current in green compacts and in samples pre-sintered at different temperatures. Shrinkage level, structural phases and grain morphology data were collected by dilatometry, X-ray diffraction and scanning electron microscopy analyses, respectively. The results showed that for the same delivered electric power, the final shrinkage was higher for higher temperature applications of the electric field and for higher electric current pulses. Moreover, the higher the porosity, the higher the final densification of the flash-sintered 10Sc1CeSZ samples, showing that pores play a role as a preferential path in the flash sintering mechanism.

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  • IPEN-DOC 24327

    RICARDO, LUIZ C.H. . Crack propagation by finite element method. Frattura ed Integrità Strutturale, v. 43, p. 57-78, 2018. DOI: 10.3221/IGF-ESIS.43.04

    Abstract: Crack propagation simulation began with the development of the finite element method; the analyses were conducted to obtain a basic understanding of the crack growth. Today structural and materials engineers develop structures and materials properties using this technique. The aim of this paper is to verify the effect of different crack propagation rates in determination of crack opening and closing stress of an ASTM specimen under a standard suspension spectrum loading from FD&E SAE Keyhole Specimen Test Load Histories by finite element analysis. To understand the crack propagation processes under variable amplitude loading, retardation effects are observed.

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  • IPEN-DOC 24329

    TEIXEIRA, BRUNA S. ; GARCIA, RAFAEL H.L. ; TAKINAMI, PATRICIA Y.I. ; DEL MASTRO, NELIDA L. . Comparison of gamma radiation effects on natural corn and potato starches and modified cassava starch. Radiation Physics and Chemistry, v. 142, p. 44-49, 2018. DOI: 10.1016/j.radphyschem.2017.09.001

    Abstract: The objective of this work was to evaluate the effect of irradiation treatment on physicochemical properties of three natural polymers, i.e. native potato and corn starches and a typical Brazilian product, cassava starch modified through fermentation-sour cassava- and also to prepare composite hydrocolloid films based on them. Starches were irradiated in a Co-60 irradiation chamber in doses up to 15 kGy, dose rate about 1 kGy/h. Differences were found in granule size distribution upon irradiation, mainly for corn and cassava starch but radiation did not cause significant changes in granule morphology. The viscosity of the potato, corn and cassava starches hydrogels decreased as a function of absorbed dose. Comparing non-irradiated and irradiated starches, changes in the Fourier transform infrared (FTIR) spectra in the 2000-1500 cm(-1) region for potato and corn starches were observed but not for the cassava starch. Maximum rupture force of the starch-based films was affected differently for each starch type; color analysis showed that doses of 15 kGy promoted a slight rise in the parameter b* (yellow color) while the parameter L* (lightness) was not significantly affected; X-ray diffraction patterns remained almost unchanged by irradiation.

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  • IPEN-DOC 24323

    AL-SHEIKHLY, MOHAMAD; VARCA, GUSTAVO H.C. . Editorial. Radiation Physics and Chemistry, v. 143, n. SI, p. 1-2, 2018. DOI: 10.1016/j.radphyschem.2017.11.011

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  • IPEN-DOC 24328

    SICCHIERI, LETICIA B. ; SILVA, MONICA N. da; SAMAD, RICARDO E. ; COURROL, LILIA C. . Can measurement of the fluorescence lifetime of extracted blood PPIX predict atherosclerosis?. Journal of Luminescence, v. 195, p. 176-180, 2018. DOI: 10.1016/j.jlumin.2017.11.014

    Abstract: In this work, fluorescence lifetime has been used to analyze protoporphyrin IX (PPIX) extracted from blood for diagnosing atherosclerosis. A total of 10 adult white male rabbits (New Zealand) were divided into the control group (CG), with a normal diet, and the experimental group (EG), subjected to a diet containing 1% cholesterol. Blood samples were collected from the animals, and protoporphyrin IX was extracted from the blood using acetone. The PPIX fluorescence lifetime (PPIXFL) was measured using time-correlated single photon counting, after excitation at 403 nm from a pulsed laser diode. It was found that the PPIX emission intensity was enhanced in the animals that had received a hypercholesterolemic diet. The CG and EG animal's fluorescence decays were fitted by three exponentials and the mean lifetimes were 4.0 ns and 9.5 ns, respectively. This lifetime dependence resulted in a calibration curve that allows the determination of the PPIX concentration with a temporal measurement. The obtained results show that fluorescence lifetime can potentially be used as a noninvasive, simple, rapid, and sensitive tool in atherosclerosis diagnosis.

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  • IPEN-DOC 24415

    SANTOS, SILAS C. ; RODRIGUES, ORLANDO; CAMPOS, LETICIA L. . Advances in colloidal processing of rare earth particles. Current Smart Materials, v. 3, p. 1-18, 2018.

    Abstract: Abstract: Background: New insights into materials science provide development of smart nano/micro structured materials for advanced applications. Rare earth includes a set of chemical elements (from La to Lu, including Sc and Y) with unique properties, the use of which is evidenced by luminescence applications. Colloidal processing offers great possibilities to obtain smart materials by controlling inter-particle forces, as well as their evolution during ceramic processing. The present article reports a review on colloidal processing with emphasis on rare earth powders. A general view about rare earths properties, including scientific investigations and applications are also presented. Methods: General view on rare earth sources, classification, properties, studies, and applications are reported. Besides, a review on colloidal processing covering particle characteristics, inter- particle forces, dispersion methods, rheology of suspensions, shaping process, drying-sintering stage, and microstructure formation is reported. Results: Yttria is the most used rare earth oxide in phosphors applications (70%). Synthesis routes imply on powder properties. Particle characteristics as size, shape, density, and surface area are important parameters for colloidal processing. The control of inter- particle forces by zeta potential evaluation and using dispersion methods provide conditions to prepare stable suspensions. Consolidation of colloidal particles into a desired shape depends on both viscosity and rheological behavior of suspensions. Drying-sintering conditions are effective on microstructure formation and component characteristics. Bio-prototyping is a low cost method, which provides components with complex shape and cellular architecture. Conclusion: Rare earths exhibit remarkable properties, being applied in diverse technological end-use. Colloidal processing provides opportunities to form smart materials since synthesis of colloids until development of complex ceramic components by shaping methods and thermal treatment. Even though colloidal processing is quite mature, investigations on rare earths involving inter- particle forces, shaping, drying-sintering stage, and microstructure formation are very scarce.

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  • IPEN-DOC 24345

    VILLAVICENCIO, ANNA L.C.H. ; HELENO, SANDRINA A.; CALHELHA, RICARDO C.; SANTOS-BUELGA, CELESTINO; BARROS, LILLIAN; FERREIRA, ISABEL C.F.R.. The influence of electron beam radiation in the nutritional value, chemical composition and bioactivities of edible flowers of Bauhinia variegata L. var. candida alba Buch.-Ham from Brazil. Food Chemistry, v. 241, p. 163-170, 2018. DOI: 10.1016/j.foodchem.2017.08.093

    Abstract: As edible flowers are highly perishable, irradiation technology can be applied to increase their shelf life, as also for phytosanitary purposes. Herein, flowers of Bauhinia variegata L. var. candida alba Buch.- Ham were submitted to electron beam irradiation at the doses of 0.5, 0.8 and 1 kGy, to study the effects in the nutritional and chemical profiles, and also in antioxidant, cytotoxic and anti-inflammatory activities. The petals of white flowers revealed interesting bioactive properties being kaempferol derivatives the most abundant compounds, especially kaempferol-3-O-rutinoside. The applied irradiation doses did not highly affect the nutritional profile. No changes were produced in cytotoxicity, but the anti-inflammatory activity slightly decreased. However, the antioxidant activity was increased, especially in the dose of 0.5 kGy, in agreement with the higher content in phenolic compounds found at this dose.

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  • IPEN-DOC 24346

    KOVACS, THELMA A. ; FELINTO, MARIA C.F.C. ; PAOLINI, TIAGO B.; ALI, BAKHAT ; NAKAMURA, LIANA K.O. ; TEOTONIO, ERCULES E.S.; BRITO, HERMI F.; MALTA, OSCAR L.. Synthesis and photoluminescence properties of [Eu(dbm)3·PX] and [Eu (acac)3·PX] complexes. Journal of Luminescence, v. 193, n. SI, p. 98-105, 2018. DOI: 10.1016/j.jlumin.2017.09.029

    Abstract: Two novel luminescent europium tris(beta-diketonate) complexes [Eu(dbm)(3)center dot PX] and [Eu(acac)(3)center dot PX](dbm: dibenzoylmethane, acac: acetylacetonate and PX: piroxicam) were successfully synthesized. These coordination compounds were characterized by infrared vibrational spectroscopy (IR), X-ray diffraction (XRD), scanning electron microscopy (SEM), thermogravimetric analysis (TGA) and luminescence spectroscopy. The thermal behavior of the complexes was investigated by thermogravimetric analysis (TG) and differential thermogravimetric analysis (DTG) techniques. The optical results have shown that these complexes present a clear intra and inter-molecular energy transfer and corroborates the sensitivity of their emission efficiency to the excitation wavelength, multiphonon non-radiative decays and temperature dependence. These new complexes may act as efficient light converting molecular devices, suggesting that they can be used for controllable photonic applications.

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  • IPEN-DOC 24355

    MOREIRA, EDSON G. ; VASCONCELLOS, MARINA B.A. ; MAIHARA, VERA A. ; CATHARINO, MARILIA G.M. ; SAIKI, MITIKO . Interlaboratory comparison for the characterization of a brazilian mussel reference material. Journal of the Brazilian Chemical Society, v. 29, n. 4, p. 823-830, 2018. DOI: 10.21577/0103-5053.20170205

    Abstract: Bivalve mollusks have long been used in biomonitoring studies to assess seawater environmental status. The use of suitable certified reference materials is a straightforward means to attain quality assurance in such studies as they allow the traceability of measurement results, making it possible the comparison of data obtained at different places and periods of time. This paper describes the certification of element mass fractions for a Perna perna mussel reference material produced in Brazil. After homogeneity and stability studies, an interlaboratory comparison was performed for element characterization. Robust means were taken as assigned values and contributions due to element characterization and from homogeneity and stability studies were taken into account to yield expanded uncertainties. From the adopted certification criteria, informative values for 20 elements were obtained and it was possible to assign certified values for the following 16 elements: Al, As, Ca, Cd, Cl, Co, Cu, Fe, K, Mg, Mn, Na, Ni, Se, Th and Zn.

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  • IPEN-DOC 24362

    PAULA, V.G. de; SILVA, M.G.; SILVA, L.M. da; SANTOS, A.O. dos; LANG, R.; OTUBO, L. ; COELHO, A.A.; CARDOSO, L.P.. Structural disorder effects on the magnetic entropy change of DyCo2 intermetallic: mechanical milling and the weakening of the itinerant electron metamagnetism mechanism. Intermetallics, v. 94, p. 1-9, 2018. DOI: 10.1016/j.intermet.2017.12.009

    Abstract: Magnetocaloric properties of the intermetallic DyCo2 compound (in the form of reduced size particles) and its correlations with the itinerant electron metamagnetism (IEM) phenomenon and structural disorders are investigated and discussed. Micrometric-sized particles were prepared by a mechanical milling technique for two low milling times (4 and 8 h) and characterized by means of X-ray diffraction, scanning and high-resolution transmission electron microscopy as well as magnetic measurements as a function of an applied external magnetic field and temperature. The results show that the particles have irregular-shaped and amorphous "edges/ledges" with embedded randomly oriented DyCo2 nanocrystallites. The average particle size practically does not change with increasing milling time, whereas the average crystallite size is slightly diminished. In contrast, microstrain values that indicate lattice deformation degree were rather increased after the milling processes. Structural disorders and surface effects, features resulting from mechanical impact, disturb the Dy-Co sublattice coupling and weaken the IEM mechanism responsible for the high magnetocaloric effect found for the DyCo2 bulk sample. For the milled samples, it was observed reductions in the peak intensity of the magnetic entropy change (-Delta S-M) and substantial broadenings of the distribution profiles which have contributed to an increase of the working temperature range of the investigated magnetocaloric material.

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  • IPEN-DOC 24364

    MAGALHAES, FLAVIA A.; CUNHA, YAN de O.C.; PIRES, JOSE E.B.; NASCIMENTO, NANCI ; SPENCER, PATRICK J. ; ANDRADE, DELVONEI A. . Perfil epidemiológico e clínico dos casos de tuberculose em Ipatinga, Minas Gerais / Epidemiological and clinical profile of tuberculosis cases in Ipatinga, Minas Gerais. Brazilian Journal of Surgery and Clinical Research, v. 21, n. 1, p. 15-20, 2018.

    Abstract: A tuberculose (TB) é uma doença infecciosa de transmissão inalatória causada pelo Mycobacterium tuberculosis. É uma preocupação, dada a alta prevalência, morbidade e mortalidade. Ipatinga é um dos municípios de alta carga da doença no estado de Minas Gerais. O objetivo do estudo foi analisar o perfil epidemiológico e clínico dos pacientes com tuberculose notificados em Ipatinga pelo Programa de Controle da Tuberculose (PCT) no período de 2004 a 2014. Foi realizado estudo epidemiológico transversal, observacional de série temporal. Foram analisados 1.098 casos notificados como TB, sendo perceptível tendência de queda do número de casos ao longo dos anos. Houve predomínio do sexo masculino (66,2%), da faixa etária de 15 a 59 anos (83,9%), da raça branca e parda e do baixo nível de escolaridade. A maioria dos casos era de residentes no município (74,9%), sendo distribuídos irregularmente entre os bairros. Clinicamente predominou casos novos (85,9%), forma pulmonar (80,9%), sendo os agravos associados mais frequentes o alcoolismo (15,3%), Síndrome da Imunodeficiência Adquirida (AIDS) (8,3%) e diabetes (5,7%). Os desfechos clínicos foram: cura em 71,4%, abandono em 8,3% e 0,2% de multidrogarresistência. O perfil dos pacientes notificados encontra-se de acordo com o encontrado na literatura.

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  • IPEN-DOC 24371

    RODRIGUES, ANDRE M.; BARDELLA, FERNANDO ; ZUFFO, MARCELO K.; LEAL NETO, RICARDO M. . Integrated approach for geometric modeling and interactive visual analysis of grain structures. Computer-Aided Design, v. 97, p. 1-14, 2018. DOI: 10.1016/j.cad.2017.11.001

    Abstract: This paper presents a novel approach that integrates geometric modeling and visual analysis of grain structures in an open source CAD system, aimed at educational purposes. An intuitive and simple automated modeling method produces valid polygonal representations of grain structures, by adopting a novel physics-based particle packing procedure with Voronoi-based tessellation. Models are structured to facilitate the development of interactive visualization prototypes in 3D interactive engines. Microstructural fidelity was pursued for the synthetic models to be accepted as representations of real materials. Meaningful sample's parameters such as mean number of neighbors and mean number of edges per face were replicated with acceptable precision, when compared to values obtained from 3D reconstruction of an alpha-iron sample. Domain-specific interactive experimental tools informed by learning and cognitive research sought to enhance spatial cognition of grain structures and support learning their fundamental features.

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  • IPEN-DOC 24376

    SANTOS, WILLIAM S.; BELINATO, WALMIR; PERINI, ANA P. ; CALDAS, LINDA V.E. ; GALEANO, DIEGO C.; SANTOS, CARLA J.; NEVES, LUCIO P. . Occupational exposures during abdominal fluoroscopically guided interventional procedures for different patient sizes — A Monte Carlo approach. Physica Medica - European Journal of Medical Physics, v. 45, p. 35-43, 2018. DOI: 10.1016/j.ejmp.2017.11.016

    Abstract: In this study we evaluated the occupational exposures during an abdominal fluoroscopically guided interventional radiology procedure. We investigated the relation between the Body Mass Index (BMI), of the patient, and the conversion coefficient values (CC) for a set of dosimetric quantities, used to assess the exposure risks of medical radiation workers. The study was performed using a set of male and female virtual anthropomorphic phantoms, of different body weights and sizes. In addition to these phantoms, a female and a male phantom, named FASH3 and MASH3 (reference virtual anthropomorphic phantoms), were also used to represent the medical radiation workers. The CC values, obtained as a function of the dose area product, were calculated for 87 exposure scenarios. In each exposure scenario, three phantoms, implemented in the MCNPX 2.7.0 code, were simultaneously used. These phantoms were utilized to represent a patient and medical radiation workers. The results showed that increasing the BMI of the patient, adjusted for each patient protocol, the CC values for medical radiation workers decrease. It is important to note that these results were obtained with fixed exposure parameters.

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  • IPEN-DOC 24381

    SILVA, DIEGO S. da ; WETTER, NIKLAUS U. ; ROSSI, WAGNER de ; KASSAB, LUCIANA R.P.; SAMAD, RICARDO E. . Production and characterization of femtosecond laser-written double line waveguides in heavy metal oxide glasses. Optical Materials, v. 75, p. 267-273, 2018. DOI: 10.1016/j.optmat.2017.10.033

    Abstract: We report the fabrication and characterization of double line waveguides directly written in tellurite and germanate glasses using a femtosecond laser delivering 30 mu J, 80 fs pulses at 4 kHz repetition rate. The double line waveguides produced presented internal losses inferior to 2.0 dB/cm. The output mode profile and the M-2 measurements indicate multimodal guiding behavior. A better beam quality for the GeO2 - Pbo waveguide was observed when compared with TeO2 - ZnO glass. Raman spectroscopy of the waveguides showed structural modification of the glassy network and indicates that a negative refractive index modification occurs at the focus of the laser beam, therefore allowing for light guiding in between two closely spaced laser written lines. The refractive index change at 632 nm is around 10(-4), and the structural changes in the laser focal region of the writing, evaluated by Raman spectroscopy, corroborated our findings that these materials are potential candidates for optical waveguides and passive components. To the best of our knowledge, the two double line configuration demonstrated in the present work was not reported before for germanate or tellurite glasses.

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  • IPEN-DOC 24382

    SILVA, RITA C.A.; SAIKI, MITIKO ; MOREIRA, EDSON G. ; OLIVEIRA, PAULO T.M.S.. The great egret (Ardea alba) as a bioindicator of trace element contamination in the São Paulo Metropolitan Region, Brazil. Journal of Radioanalytical and Nuclear Chemistry, v. 315, n. 3, p. 447-458, 2018. DOI: 10.1007/s10967-017-5687-y

    Abstract: To investigate great egret as a possible bioindicator of trace element contamination, the concentrations of Br, Cd, Co, Cs, Cu, Fe, Hg, K, Mg, Mn, Na, Rb, Se and Zn were determined in livers of great egrets (Ardea alba) by the methods of Instrumental Neutron Activation Analysis and Atomic Absorption Spectrometry. It was observed that the levels of trace elements found in their livers may indicate contamination of the studied region. Thus, the livers of this species can be considered as a suitable bioindicator of contamination of the aquatic systems in the So Paulo Metropolitan Region.

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  • IPEN-DOC 24385

    SANTOS, THAMYSCIRA H.; GRILO, JOAO P.F.; LOUREIRO, FRANCISCO J.A.; FAGG, DUNCAN P.; FONSECA, FABIO C. ; MACEDO, DANIEL A.. Structure, densification and electrical properties of Gd3+ and Cu2+ co-doped ceria solid electrolytes for SOFC applications: effects of Gd2O3 content. Ceramics International, v. 44, n. 3, p. 2745-2751, 2018. DOI: 10.1016/j.ceramint.2017.11.009

    Abstract: Ceria-based solid electrolytes exhibit superior electrical conductivity compared to traditional yttria-stabilized zirconia ceramics. However, they require high sintering temperatures to achieve full densification. Transition metal oxides exhibiting low melting points, such as CuO, have been used as additives to lower the sintering temperature of these materials. In this context, the present work is focused on the evaluation of the effects of gadolinium oxide (Gd2O3) content on the structure, densification and electrical properties of ceria co-doped with CuO. Nominal compositions of Ce0.99-xGdxCu0 O-01(2.delta) (0 <= x <= 0.3) were synthesized by the polymeric precursor method. The precursor powders were characterized by simultaneous thermogravimetry and differential thermal analysis (TG/DTA) and the calcined powders were studied by X-ray diffraction (XRD) and Rietveld refinement to obtain crystallographic parameters. The sinterability of green bodies was evaluated by dilatometry up to 1200 degrees C. The relative density was determined in samples sintered between 950 and 1050 degrees C and the microstructural characterization was performed by scanning electron microscopy (SEM). The electrical properties were investigated by impedance spectroscopy (IS). The XRD results confirms the formation of a cubic fluorite type structure in the entire composition range. The lattice parameters obtained by Rietveld refinement showed a reduction in the crystallite size with increasing gadolinium content. Densification was improved with increasing Gd-content up to x = 0.15. The electrical conductivity was enhanced by gadolinium addition, reaching a maximum of 7.81 mS cm(-1) at 600 degrees C for the composition x = 0.15 sintered at a temperature as low as 1050 degrees C.

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  • IPEN-DOC 24394

    VEGA, L.E.R.; LEIVA, D.R.; LEAL NETO, R.M. ; SILVA, W.B.; SILVA, R.A.; ISHIKAWA, T.T.; KIMINAMI, C.S.; BOTTA, W.J.. Mechanical activation of TiFe for hydrogen storage by cold rolling under inert atmosphere. International Journal of Hydrogen Energy, v. 43, n. 5, p. 2913-2918, 2018. DOI: 10.1016/j.ijhydene.2017.12.054

    Abstract: TiFe is a very interesting material for hydrogen storage in the solid state, due to its hydrogen capacity of 1.9 wt % and to the fact it can be absorb/desorb hydrogen at room temperature. However, the TiFe produced by casting does not absorb hydrogen, unless a procedure called activation is applied, which is based on a repetition of several thermal cycles. This study evaluates the effects of a mechanical activation route for the TiFe intermetallic compound, namely, cold rolling (CR) under inert atmosphere. Stoichiometric TiFe was prepared from elementary powders by arc melting. Ingot was grinded and then cold rolled for 20 and 40 passes under argon inside a glove box, with moisture and oxygen contents below 0.1 ppm. Cold rolled samples consisted of two parts: powder particles and thin cracked flakes. The results showed that mechanically activated samples by CR exhibited rapid absorption of hydrogen at room temperature, without using a thermal activation process. In general, the average storage capacity of hydrogen was 1.4 wt% H-2 for the first absorption, regardless of the number of passes for both flake and powder samples.

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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.