Navegação por ano de publicação "2016"

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  • IPEN-DOC 22193

    MIRANDA, LEILA F. de; VALE, MARCOS; MUNHOZ JUNIOR, ANTONIO H.; MASSON, TEREZINHA J.; ANDRADE e SILVA, LEONARDO G. de . Zinc chloride influence on the resins furan polymerization to foundry moulds. In: IKHMAYIES, SHADIA J. (Ed.); LI, BOWEN (Ed.); CARPENTER, JOHN S. (Ed.); HWANG, JIANN-YANG (Ed.); MONTEIRO, SERGIO N. (Ed.); LI, JIAN (Ed.); FIRRAO, DONATO (Ed.); ZHANG, MINGMING (Ed.); PENG, ZHIWEI (Ed.); ESCOBEDO, JUAN P. (Ed.); BAI, CHENGUANG (Ed.) CHARACTERIZATION OF MINERALS, METALS, AND MATERIALS. 145th . ANNUAL MEETING & EXIBITION, February 14-18, 2016, Nashville, Tennessee, USA. Proceedings... New York: Wiley , 2016, 2016. p. 771-778.

    Palavras-Chave: foundries; furans; resins; polymerization; productivity; zinc chlorides; composite materials; tensile properties; scanning electron microscopy; spectrometers

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  • IPEN-DOC 22911

    NABESHIMA, CAMILA T.; ALVES, SARAH I.P.; F. NETO, ANTONIO M.; SAMAD, RICARDO E. ; COURROL, LILIA C.; SILVA, FLAVIA R.O. . Z-scan technique: a new concept for diagnosis of prostate cancer in blood. In: FRONTIERS IN OPTICS/LASER SCIENCE, October 17-21, 2016, Rochester, New York, USA. Proceedings... Washington, DC, USA: OSA, 2016.

    Abstract: Porphyrin accumulate substantially more in tumors than in normal tissues. The optical nonlinearity of the blood porphyrin was analyzed using Z-scan technique. The results showed a decrease in nonlinear refractive index value for tumor blood.

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  • IPEN-DOC 23682

    DENALDI, R.L.; BALDOCHI, S.L. ; GOMES, L. ; MAZZOCCHI, V.L. ; MORAES, J.R. ; PARENTE, C.B.R. . Yb:Er-doped LiLa(WO4)2 single crystal fiber growth. In: INTERNATIONAL CONFERENCE ON CRYSTAL GROWTH AND EPITAXY, 18th, August 7-12, 2016, Nagoya, Japan. Abstract... 2016.

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  • IPEN-DOC 23696

    SILVA, IVAN G.N.; MUSTAFA, DANILO; RODRIGUES, RODRIGO V.; MERIZIO, LEONNAM G.; FELINTO, MARIA C.F.C. ; BRITO, HERMI F.. Y2O2SO4:Eu3+ nanomaterials synthesis by a benzenecarboxylate method. In: BRAZILIAN MEETING ON INORGANIC CHEMISTRY, 18th, September 25-30, 2016, São Pedro, SP. Abstract... 2016.

    Abstract: Luminescent nanomaterials have been mainly investigated in recent years because of significant differences in structure and performance from the bulk [1,2]. Most preparation methods of nanosized luminophores need high temperatures or complicated experimental procedures. Rare earth (RE) 5-Sulfoisophthalic acid complexes (RE(STMA)·4H2O) decompose to rare earth sulfates RE2O2SO4:Eu3+ in one step at low temperature, the compounds were annealed at 500, 600, 700, 800, 900 and 1000 °C [3]. This work reports a new low temperature preparation method of the Y2O2SO4:Eu3+ nanomaterials based on benzenecarboxylate method precursors. TGA analyses (Fig. 1) show on event from 35 to 175 °C corresponding to the loss of 4 water molecules and only one decomposition event, from 490 to 670 °C (loss of organic moiety). The XRD confirms the obtainment of Y2O2SO4:Eu3+ materials without the presence of other phases up to 900 °C, after this temperature Rietveld refinement show formation of Y2O3. The excitation spectra (Fig. 2) exhibit the LMCT O→Eu band centered at 275 nm and the intraconfigurational 4f transitions of Eu3+. The excitation spectra show similar features independently of the annealing temperature, with the presence of an extra low intensity broad band in the compounds annealed at 500 and 600 °C, owing to oxycarbonated. The emission spectra (Fig. 3) exhibit only the intraconfigurational 4f transitions of the Eu3+ ion, with the presence of transitions arising from the 5DJ (J: 0, 1 and 2).

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  • IPEN-DOC 23549

    ARATA, A. ; PRETTO, L.R. de; USSUI, V. ; LIMA, N.B. ; FREITAS, A.Z. ; MACHADO, J.P.B.; TANGO, R.N.; SOUZA, G.M.D. de; LAZAR, D.R.R. . Y-TZP low temperature degradation: a sigmoidal or a linear behavior?. Dental Materials, v. 32, 1, p. e99-e99, 2016. DOI: 10.1016/j.dental.2016.08.208

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  • IPEN-DOC 22569

    PEIXOTO, JOSE G.P.; POTIENS, MARIA da P. . X and gamma ray secondary standard metrology. In: PEIXOTO, JOSE G.P. (Ed.). Ionizing radiation metrology. Rio de Janeiro, RJ: Instituto de Radioproteção e Dosimetria, 2016. p. irregular,

    Palavras-Chave: x radiation; gamma radiation; dosimetry; calibration; radiotherapy; radiation protection

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  • IPEN-DOC 23843

    METAIRON, S. ; ZAMBONI, C.B. ; SUZUKI, M.F. . Whole blood differences of inorganic elements in dystrophic animal models. In: REUNIÃO DE TRABALHO SOBRE FÍSICA NUCLEAR NO BRASIL, 39., 03-07 de setembro, 2016, Natal, RN. Abstract... 2016.

    Abstract: The Duchenne Muscular Dystrophy (DMD) disease is characterized by presenting an irreversible progressive degeneration of skeletal muscle. Currently, no effective treatment is available and the DMD research progress depends on animal models. In order to evidence in more details the alterations that DMD disease may cause in blood a comparison of inorganic elements between two animal models (mouse and dog) with muscular dystrophy were made. The dystrophic models were obtained from different research centers at São Paulo city. Several inorganic elements of clinical and nutritional relevance were investigated using Neutron Activation Analysis (NAA). These measurements were performed in the nuclear reactor IEA-R1 (3.5- 4.5MW, pool type) at IPEN/CNEN-SP, Brazil. The knowledge of the elemental composition in these animal models may also help to identify the physiologic difference among them. Moreover, these data can be useful for biochemistry analyses contributing for studying in more details the anomalies caused by DMD.

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  • IPEN-DOC 23699

    BRITO, HERMI F.; BARBOSA, HELLIOMAR P.; FELINTO, MARIA C.F.C. ; MALTA, OSCAR L.. White light emission of the single-phased CaWO4:Tb3+,Eu3+,Dy3+ materials prepared by an environmentally friendly method. In: BRAZILIAN MEETING ON INORGANIC CHEMISTRY, 18th, September 25-30, 2016, São Pedro, SP. Resumo... 2016.

    Abstract: Trivalent rare earth (RE3+) doped tungstates [WO4]2- host matrix offers possibility to design new photoluminescent materials.1 Nowadays, there is an increasing interest of WLEDs to replace the conventional fluorescent lamps due its environment-friendliness and tuneable colours.2,3 Here we report preparation as well as the spectroscopic properties of the new highly luminescent white emitting materials Tb3+/Eu3+/Dy3+ triply-doped in CaWO4 matrix. The materials were prepared by coprecipitation method at room temperature with stoichiometry aqueous solutions of Na2WO4, CaCl2 and RECl3 (RE3+: Tb, Eu, Dy with 0.5 to 5.0 mol% of the Ca2+ amount). The RE3+ doping concentrations were identical for each rare earth ion in the range from 0.5-5.0 mol%. The XPD measurements revealed the as-prepared CaWO4:xTb3+,xEu3+,xDy3+ (x: 0.5-5.0 mol%) particles belong to the tetragonal scheelite phase with I41/a (#88) space group. The average crystallite sizes are ~11 nm. The white luminescence emission arising mainly from the 5D07F2 (Eu3+), 5D47F5 (Tb3+) and 4F9/26H15/2 (Dy3+) transitions at 614 nm (red), 545 (green) and 488 (blue), respectively (Fig. 1). The emission lifetimes of the 5D0, 5D4 and 4F9/2 emitting levels were and their values are reduced when comparing the ratio from 0.5-5.0 mol% of the RE3+ ions, respectively. The results indicate the presence of energy transfer processes between RE3+. These values could be assigned to non-radiative energy transfer contributions of the Dy3+Tb3+, Dy3+Eu3+ and Tb3+Eu3+ systems due the cross relaxation. The CIE diagram (Fig. 1 right) exhibits emissions whitish colour indicating that these materials could be suitable for solid state lighting technology.

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  • IPEN-DOC 23999

    BARBOSA, HELLIOMAR P.; PEDROSO, CASSIO C.S.; FELINTO, MARIA C.F.C. ; MALTA, OSCAR L.; BRITO, HERMI F.. White light emission of the single-phase CaWO4:Dy3+ phosphors by simple synthesis and fast heating. In: BRAZILIAN MEETING ON INORGANIC CHEMISTRY, 18th, September 25-30, 2016, São Pedro, SP. Resumo... 2016.

    Abstract: Tungstates activated by trivalent rare earth ions (RE3+) can be used for many optical devices.1 Nowadays, there is an increasing interest in white phosphors emitting to application in white-light-emitting devices (WLEDs) replacing the conventional fluorescent lamps due its ecofriendliness and tuneable colours. Here we report preparation as well as the spectroscopic properties of the single phase new highly luminescent white emitting of Dy3+ doped into the CaWO4 materials. The materials were prepared by coprecipitation method at room temperature with stoichiometry aqueous solutions of Na2WO4, CaCl2 and DyCl3 (0.1 to 5.0 mol% of the Ca2+ amount). The as-prepared materials were heated for 22 min between 900 – 1000 W in a domestic microwave oven and using Fe3O4 (60 g) susceptor as heating source. The XPD measurements revealed the CaWO4:Dy3+ particles belong to the tetragonal scheelite phase with I41/a (#88) space group. The emission arising mainly from the 4F9/26H15/2 (blue) and 6H13/2 (yellow) transitions are corresponding to the 488 and 575 nm, respectively (Fig.). At lower doping concentrations the broad band (~420 nm) is due to the WO4 group emission. Increasing the RE3+ doping concentration the main emission lines transitions of the Dy3+ are enhanced. After heating, the 1.0 mol% Dy3+ doped material exhibit a better whitish emission due to the simultaneous presence of broad band of the host in blue region and emission lines at longer wavelengths (Fig.). The lifetimes decrease monotonously in function of the Dy3+ concentration which indicates that the energy transfer from host to the Dy3+ becomes more efficient. These results suggest that CaWO4:Dy3+ could act as a white emitting phosphor in solid state-lighting technology.

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  • IPEN-DOC 23916

    REIS, A.S.; GUILHEN, S.N.; ORTIZ, N. . Water treatment adsorption and UV photodecomposition processes for antibiotics: Cephalexin and Amoxicillin. In: IWA LEADING EDGE CONFERENCE ON WATER AND WASTEWATER TECHNOLOGIES, 13th, June 13-16, 2016, Jerez de la Frontera, Spain. Resumo expandido... 2016.

    Abstract: The developed of water treatment process to adsorb and decompose the pharmaceutical antibiotic amoxicillin and cephalexin using iron oxide –hematite, quitosan and UV radiation. The equilibrium time te= 180 min and the removal percentage for amoxicillin was 90% similar with those found in literature. In same experimental parameters the Cephalexin removal percentage was 25% some parameter have been alter to promote the photodecomposition such antibiotic mixture. The results confirm an indicate the possible use of UV photodecomposition reaction as a promising water treatment to treat, adsorb and decompose antibiotic residues in the environment.

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  • IPEN-DOC 23554

    SILVA, A.C. ; MELLO-CASTANHO, S.R.H. . Vitrificação de resíduos industriais contendo metais tóxicos: Análise da corrosão superficial após 10 anos de exposição à umidade do ar / Vitrification of industrial waste containing toxic metals: analysis of surface corrosion after 10 years of exposure to air moisture. In: CONGRESSO BRASILEIRO DE CERAMICA, 60., 15-18 de maio, 2016, Águas de Lindóia, SP. Anais... 2016. p. 2189-2200.

    Abstract: Vitrification of industrial waste containing transition metals has been widely studied as a means of mitigating harmful emissions to the environment. The chemical inertness of these materials is the key factor for their environmental safety. The chemical resistance was avaliated by hydrolytic, acid and alkali medium attack test that has been used for simulation of behavior along the time. However, there is a lack of studies that demonstrate the actual performance of such materials. Glass containing 10 to 50 Wt% of toxic metals (Cr, Ni, Cu, Zn) were prepared by the method of replacing cations modifiers for metals, having a chemical resistance and characterized evaluated by various techniques, proving the superior performance of samples containing between 30 and 40 wt% of transition metal oxides being the same or similar performance of commercial soda-lime glasses. After the initial characterization the glasses samples were exposed to the atmosphere, safe from bad weather during periods non less than 10 years at room temperature and in the shade in the region of São Paulo. In this study the samples were retested by SEM, XRD and FT-IR. Was observed the corrosion products formation in the samples with 10, 20 and 50 Wt% of metal oxide contained. The comparison with initial results to current characterizations (10 years later) showed consistent behavior with the behavior prediction obtained by the chemical resistance tests when the samples was prepared, i.e., samples containing between 30 and 40 Wt% of toxic metals was maintained the planned stability.

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  • IPEN-DOC 23562

    SILVA, A.C. ; MELLO-CASTANHO, S.R. ; SANTOS, F.A. ; SANTOS, C.. Vidros biocidas baseados no sistema Nb2O5-SiO-CAO-Na2O. In: CONGRESSO BRASILEIRO DE ENGENHARIA E CIENCIA DOS MATERIAIS, 22., 06-10 de novembro, 2016, Natal, RN. Resumo... 2016. p. 1700.

    Abstract: Neste trabalho, foram desenvolvidos vidros com base no sistema de SiO-CaO-Na2O contendo diferentes teores de Nb2O5. Estes vidros foram fundidos a 1500°C por 4 horas seguido de “quenching” em molde metálico e recozimento a 500°C por duas horas e resfriamento natural no forno. Corpos de prova de aço inoxidável 316L e ligas de titânio foram recobertas com os materiais Os ensaios de caracterização utilizaram as técnicas de DRX, FT-IR e análise da expansão térmica. Também realizou-se ensaios de citotoxicidade utilizando a metodologia de absorção de vermelho neutro onde foi indicado o crescimento celular normal, o que permite a sua utilização como biomaterial. A atividade biocida foi avaliada através da incubação de vidro em suspensão bacteriana (E.coli) a 37°C sob agitação. A composição com alto teor de de SiO2 e baixo teor de Nb2O5 apresentou maior atividade biocida e o coeficiente de expansão térmica indicam compatibilidade dos materiais térmica com o aço inoxidável 316L e ligas de titânio.

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  • IPEN-DOC 23801

    MATSUSHIMA, LUCIANA; VENEZIANI, GLAUCO ; SAKURABA, ROBERTO; CAMPOS, LETICIA . Verification of doses for total skin electron irradiation using thermoluminescent dosimeters and diodes. In: INTERNATIONAL CONFERENCE ON SOLID STATE DOSIMETRY, 18th, July 03-08, 2016, Munich, Germany. Abstract... 2016.

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  • IPEN-DOC 22869

    ALGARVE, FABIO J. ; CALDAS, LINDA V.E. . Verificação da influência do suporte de pastilhas na resposta TL do BeO / Verification of the influence of the pellet support cover on the TL response of BeO. In: CONGRESSO BRASILEIRO DE METROLOGIA DAS RADIAÇOES IONIZANTES, 3., 21-23 de novembro, 2016, Rio de Janeiro, RJ. Anais... 2016. p. 1-4.

    Abstract: O objetivo deste trabalho foi verificar a influência da tampa do suporte de pastilhas de um dispositivo dosimétrico na resposta termoluminescente (TL) do BeO, considerando que ele poderia causar uma atenuação no feixe. Entretanto, os resultados demonstraram que o dispositivo testado não é sensível à influência da referida tampa. Portanto, a utilização deste suporte no dispositivo dosimétrico empregado não altera a resposta TL no estudo das características dosimétricas do BeO.

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  • IPEN-DOC 23082

    VEDOLIN, M.C.; TEOPHILO, C.Y.S.; FIGUEIRA, R.C.L.; TURRA, A.. Variabilidade espacial da concentração de metais em microplásticos coletados em praias: um novo insight sobre poluição. In: CONGRESSO BRASILEIRO DE OCEANOGRAFIA, 7., 05-09 de novembro, 2016, Salvador, BA. Resumo... 2016. p. 805-805.

    Abstract: O termo “microplástico” é atribuído a produtos plásticos, os quais o tamanho estão dentro do intervalo de 1 a 10mm, variando de estudo para estudo. Dentre estes produtos, estão os pellets, grânulos plásticos que correspondem à forma principal com que as resinas plásticas são produzidas e comercializadas para serem usadas como matéria-prima em indústrias de transformação, onde são derretidas e moldadas de acordo com o produto final. Devido à perda durante os processos de produção e transporte, tais pellets podem atuar como uma potencial fonte contaminante no ambiente por conta da liberação e/ou adsorção de contaminantes orgânicos e inorgânicos. Este estudo investiga as interações entre poluentes inorgânicos, os metais, dissolvidos em pellets coletados em diferentes praias do litoral de São Paulo. Especificamente, o estudo comparou a realização do método e seus resultados em grânulos virgens, ou seja, aqueles obtidos a partir de uma fábrica de moldagem com os recolhidos das praias. Foram quantificados os elementos: Al, Cr, Cu, Fe, Mn, Sn, Ti e Zn empregando a técnica de espectrometria de emissão atômica com plasma indutivamente acoplado (ICP-OES). Os polímeros foram solubilizados via digestão ácida (EPA3050B). Os níveis de metais em amostras de pellets virgens são relativamente baixos, se comparados aos pellets coletados, indicando a possível pureza destas amostras. Já para os pellets coletados, os níveis de metais apresentam a seguinte ordem crescente de concentração: Fe> Al > Mn> Ti > Cu , Zn, sendo os maiores valores encontrados para Fe e Al, 391,56 mg kg-1, praia de Itaguaré e 58,63 mg kg-1, praia de Tabatinga , respectivamente. Houve diferença significativa nos níveis de metais em relação aos locais amostrados (Anova p<0,05) e em relação aos elementos analisados (Anova p<0,05), no entanto, não houve diferença estatística entre os elementos Ti e Zn (teste de Tukey p>0,05). Para a maioria dos metais, os maiores níveis ocorrem em áreas de intensa urbanização e/ou próximas a regiões portuárias, indicando a poluição gerada por tais locais. Essa condição, somada ao fato da capacidade de adsorção de metais em pellets coletados ser maior devido ao desenvolvimento de sítios de absorção na superfície durante a exposição a condições ambientais; pode aumentar o potencial do pellet como um acumulador. Sendo assim, os resultados sugerem que pellets de plástico têm o potencial de acumular e transportar metais no ambiente marinho, mesmo em pequena quantidade, podendo ser considerados como um vetor para o transporte destes poluentes no meio ambiente.

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  • IPEN-DOC 22667

    DEETER, M.N.; MARTINEZ-ALONSO, S.; GATTI, L.V. ; GLOOR, M.; MILLER, J.B.; DOMINGUES, L.G. ; CORREIA, C.S.C. . Validation and analysis of MOPITT CO observations of the Amazon Basin. Atmospheric Measurement Techniques, v. 9, n. 8, p. 3999-4012, 2016. DOI: 10.5194/amt-9-3999-2016

    Abstract: We analyze satellite retrievals of carbon monoxide from the MOPITT (Measurements of Pollution in the Troposphere) instrument over the Amazon Basin, focusing on the MOPITT Version 6 “multispectral” retrieval product (exploiting both thermal-infrared and near-infrared channels). Validation results based on in situ vertical profiles measured between 2010 and 2013 are presented for four sites in the Amazon Basin. Results indicate a significant negative bias in retrieved lower-tropospheric CO concentrations. The possible influence of smoke aerosol as a source of retrieval bias is investigated using collocated Aerosol Robotic Network (AERONET) aerosol optical depth (AOD) measurements at two sites but does not appear to be significant. Finally, we exploit the MOPITT record to analyze both the mean annual cycle and the interannual variability of CO over the Amazon Basin since 2002.

    Palavras-Chave: validation; carbon monoxide; brazil; satellites; pollution; troposphere; measuring instruments

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  • IPEN-DOC 21731

    CARVALHO, JOSE M.; LASTUSAARI, MIKA; RODRIGUES, LUCAS C.V.; HOLSA, JORMA; FELINTO, MARIA C.F.C. ; BRITO, HERMI F.. Valence control of Pr in ZrOsub(2) nanocrystals by aliovalent Gdsup(3+) co-doping. Journal of Luminescence, v. 170, n. 2, p. 627-632, 2016.

    Palavras-Chave: valence; praseodymium; luminescence; nanostructure; crystals; doped materials; zirconium oxides; gadolinium; x-ray diffraction; relaxation

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  • IPEN-DOC 23588

    ARAUJO, M.S.; MARTINELLI, J.R. ; GENOVA, L.A. ; PRADO, U.S. do . Utilização de resíduos de catalisador (ECAT) e cinzas da casca de arroz (CCA) na elaboração de vidros silicatos soda-cal destinados ao setor de embalagem / Use of rice rusk ash and spent catalyst as a source of raw material for the production and characterization of soda-lime silicate glasses destined for packaging. In: CONGRESSO BRASILEIRO DE ENGENHARIA E CIENCIA DOS MATERIAIS, 22., 06-10 de novembro, 2016, Natal, RN. Anais... 2016. p. 2325-2336.

    Abstract: Study on the use of rice husk ash (RHA) and waste catalyst (ECAT), two industrial solid waste generated in large quantities in Brazil, getting soda-lime glass for the production of packaging. Both the waste may be classified as class II waste according to NBR 10,004. Samples were produced adding Na2CO3 and CaO to obtain a composition within the range of commercial soda-lime glasses. The results showed that both can be used as received (without any previous treatment) replacing important raw materials, source of Al2O3 and SiO2, necessary for glass formation. The produced samples were amber due to the presence of nickel (Ni2+ ions) from the ECAT and optical transmittance of 18%. These also showed good homogeneity, i.e., absence of bubbles and striae and dissolution rate higher than a commercial soda-lime glass. In general, the samples are presented suitable for applications that require low transmittance such as colored glass containers, which does not require perfect visibility and transparency. Finally, the waste level of incorporation was approximately 78 mass%.

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  • IPEN-DOC 21777

    ARAUJO, MARIANA S. de . Utilização de resíduos de catalisador (ECAT) e cinzas da casca de arroz (CCA) na elaboração de vidros silicatos soda-cal destinados a embalagem / Use of rice rusk ash and spent catalyst as a source of raw material for the production and characterization of soda-lime silicate glasses destined for packaging . 2016. Dissertação (Mestrado em Tecnologia Nuclear) - Instituto de Pesquisas Energeticas e Nucleares - IPEN-CNEN/SP, São Paulo. 81 p. Orientador: Luís Antonio Genova.

    Abstract: Estudo realizado acerca da utilização de dois resíduos sólidos industriais (RSI) gerados em grande quantidade no Brasil, na obtenção de vidros soda-cal destinados à produção de embalagens. Os resíduos avaliados foram a cinza de casca de arroz (CCA) e resíduo do catalisador usado das unidades de Craqueamento Catalítico Fluido das Petroquímicas (ECAT), ambos podem ser classificados como resíduos sólidos de classe II de acordo com a norma NBR 10.004. Esta nova proposta para destinação desses resíduos é uma alternativa às atuais disposições, buscando não apenas minimizar os impactos ambientais gerados, mas também a valorização dos mesmos como matérias-primas. Para a produção das amostras, além da utilização dos RSIs, foram também utilizados óxidos fundente (Na2CO3) e estabilizante (CaO). Os resultados obtidos demonstraram que ambos podem ser usados como recebidos (sem tratamento prévio) substituindo matérias-primas importantes, fontes de Al2O3 e SiO2, necessárias para a formação de vidros. As amostras obtidas apresentaram a cor âmbar devido a presença de níquel (íons Ni2+) proveniente do ECAT e transmitância óptica de 18%. Estas, ainda demonstraram boa homogeneidade, i.e., ausência de bolhas e estriais e, resistências hidrolíticas média de 1,33x10-8 g/cm²·dia (superior à um vidro comercial de composição semelhante) de acordo com a ISO695-1984. O vidro obtido é adequado para aplicações que exigem baixa transmitância como embalagens de vidros em geral, os quais não requerem perfeita visibilidade e transparência. O teor de incorporação na composição final das amostras foi de aproximadamente 78% em massa.

    Palavras-Chave: glass industry; packaging; lime-soda sinter process; silicates; solid wastes; industrial wastes; recycling; rice; shells; sodium carbonates; calcium silicates; oxides; x-ray diffraction; fluorescence; electron microscopy

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  • IPEN-DOC 23615

    FERMINO, D.M.; OLIANI, W.L. ; PARRA, D.F. ; VALENZUELA-DIAZ, F.R.. Utilização de celulose e nanoargila como agentes de reforço em polipropileno / Celullose and nanoclay utilized reinforcement agents in polypropylene. In: CONGRESSO BRASILEIRO DE ENGENHARIA E CIENCIA DOS MATERIAIS, 22., 06-10 de novembro, 2016, Natal, RN. Anais... 2016. p. 9447-9454.

    Abstract: This work concerns the study of the mechanical properties and morphological of polypropylene hybrid nanocomposites with Brazilian smectite nanoclay the state of Paraiba (PB), at concentrations of 1, 2 and 5 % by weight nanoclay with the addition of 1 and 2 % by weight cellulose from discarded bond paper. Polypropylene with 3 % by weight polypropylene graft compatibilizer (PP-g-AM) was mixed of nanoclay/cellulose using a twin-screw extruder. The specimens were prepared by the injection process. The mechanical behavior was evaluated by strength, flexural strength and IZOD impact. In addition, clay and cellulose were characterized by X-ray diffraction (XRD), X-ray fluorescence (XRF) and scanning electron microscopy (SEM). With addition of cellulose in the polypropylene increased 8 % in strength and 21 % in IZOD impact test. By SEM was observed cellulose agglomeration in hybrid nanocomposites.

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  • IPEN-DOC 23793

    FERREIRA, P.Z.; CARVALHO, G.S.M.; CUNHA, D.M.; DANTAS, N.O.; SILVA, A.C.A.; NEVES, L.P. ; CALDAS, L.V.E. ; CARRERA, B.N.S.; WATANABE, S.; PERINI, A.P.. Utilização da técnica de termoluminescência para caracterização de uma nova matriz vítrea. In: SIMPÓSIO DE ENGENHARIA BIOMÉDICA, 9., 22-26 de agosto, 2016, Uberlândia, MG. Anais... 2016. p. 13-16.

    Abstract: A utilização de dosímetros é muito importante na monitoração de radiação ionizante, que pode ser empregada na área médica, industrial e ambiental. A técnica de termoluminescência é muito utilizada em dosimetria de doses altas, que inclui atividades como gamagrafia, esterilização de materiais cirúrgicos, irradiação de alimentos, etc. As principais vantagens de materiais dosimétricos termoluminescentes são as suas pequenas dimensões, o fato de não necessitarem de cabos ou equipamentos auxiliares durante a medida da dose e suas altas sensibilidades para detecção de radiação. A técnica termoluminescente consiste basicamente na detecção de um sinal luminescente, de um material previamente irradiado, por meio de um estímulo térmico. Neste trabalho, a técnica de termoluminescência foi utilizada para estudar uma nova matriz vítrea, com composição nominal de 20Li2CO3.10Al2O3.10BaO.60B2O3 (mol%) irradiada com doses entre 10 Gy e 900 Gy em uma fonte de 60Co. Os resultados obtidos mostraram que esta nova matriz vítrea apresenta uso potencial em dosimetria de altas doses.

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  • IPEN-DOC 23818

    VEDOVATO, U.P.; SILVA, R.J.V.; NEVES, L.P. ; SANTOS, W.S. ; BELINATO, W.; CALDAS, L.V.E. ; PERINI, A.P.. Utilização da simulação de Monte Carlo para o estudo de uma câmara de ionização de extrapolação em um feixe de radiodiagnóstico padrão. In: SIMPÓSIO DE ENGENHARIA BIOMÉDICA, 9., 22-26 de agosto, 2016, Uberlândia, MG. Anais... 2016. p. 4-6.

    Abstract: Neste trabalho, foi estudada a influência dos componentes de uma câmara de ionização de extrapolação na sua resposta. Este estudo foi realizado utilizando o código de Monte Carlo MCNP-4C, e a qualidade padrão de radiodiagnóstico para feixes diretos (RQR8). Usando o tally F6 e 2,1 𝑥𝑥 109 histórias simuladas, os resultados mostraram que a configuração e o material da câmara de ionização não alteraram significativamente a energia depositada em seu volume sensível. O eletrodo coletor e a placa suporte foram os componentes com maior influência na resposta da câmara de ionização.

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  • IPEN-DOC 22962

    SILVA, LAIS de F.F.L. da ; ZAMBONI, CIBELE B. . Uso do Espectrômetro compacto de FRX como alternativa para prática clínica. In: PROGRAMA INSTITUCIONAL DE BOLSAS DE INICIAÇÃO CIENTÍFICA; SEMINARIO ANUAL PIBIC, 22.; SEMINARIO ANUAL PROBIC, 13.; SEMINARIO ANUAL PIBITI, 6., 07-08 de dezembro, 2016, São Paulo, SP. Resumo expandido... São Paulo, SP: IPEN, 2016. p. 197-198.

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  • IPEN-DOC 22714

    BISCONSIN JUNIOR, ANTONIO; TOPOLNIAK, LUCIANO; DIAS, ALDISON D.F.; MEDINA, MICHELLY C.R.; OLIVEIRA, CLAUDINEI de; NASCIMENTO, NANCI do . Uso da radiação gama na agricultura. Revista de Educação Tecnológica e Científica, v. 1, n. 1, p. 1-18, 2016. Orientador: GAMMA RADIATION.

    Abstract: Enquanto a população mundial cresce, a quantidade de terra disponível para a produção de alimentos continua a mesma, o que torna necessário o uso de tecnologias que sejam capazes de aumentar a produtividade, preservar a qualidade e conservar os alimentos após a colheita. Neste contexto, esta revisão apresenta as diversas aplicações da radiação gama na agricultura, avaliando os benefícios e malefícios do uso desta tecnologia, que tem conferido benefícios, como o crescimento acelerado, melhoramento da produção, resistência às pragas e maior tempo de preservação. Para tanto, a radiação gama pode ser utilizada no solo, nas sementes, durante a produção e no pós-colheita de diversos alimentos de origem vegetal. Na aplicação em sementes, geralmente, a radiação gama apresenta efeitos negativos na germinação e crescimento da planta, contudo esses efeitos são considerados vantajosos para o armazenamento de sementes que serão consumidas. Quanto ao solo, foi possível observar que certas doses de radiação gama afetam apenas grupos específicos de micro-organismos, sendo possível reduzir o uso de agrotóxicos. Os maiores benefícios encontrados dizem respeito ao controle de pragas nas lavouras e na preservação dos vegetais após a colheita. O manejo de insetos-pragas é realizado com a radioentomologia, que consiste em tornar os insetos machos estéreis por irradiação e liberá-los em lavouras infestadas, para acasalarem com as fêmeas sem resultados positivos. No pós-colheita, a irradiação tem sido utilizada para inativar micro-organismos patógenos e deterioradores, desinfestar produtos armazenados, inibir o brotamento de bulbos e tubérculos, bem como para alterar o metabolismo de amadurecimento e senescência dos vegetais.

    Palavras-Chave: agriculture; gamma radiation; ionizing radiations; soils; seeds; yields; harvest process; uses; food; production

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  • IPEN-DOC 23672

    ALCANTARA, R.R.; CORREA, W.C.; ORTIZ, N. ; FUNGARO, D.A. . Using natural adsorbent bamboo biochar for rhodamine b removal from aqueous solution. In: IWA LEADING EDGE CONFERENCE ON WATER AND WASTEWATER TECHNOLOGIES, 13th, June 13-16, 2016, Jerez da la Frontera, Spain. Proceedings... 2016.

    Abstract: Bamboo biochar was tested for its efficiency in removing Rhodamine B (RB) dye from aqueous solution. The bioadsorption process was measured through equilibrium adsorption isotherms represented by the Langmuir and Freundlich models. Nonlinear regression method was used for the determination of isotherm parameters. An error analysis was undertaken to investigate the effect of applying six error criteria to determine the best-fitting equilibrium model to the experimental data. The equilibrium data for RB adsorption well fited to the Langmuir equation, with maximum monolayer adsorption capacity of 0.638 mg g-1. The present investigations show that bamboo biochar is an alternative adsorbent for RB removal from wastewater.

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  • IPEN-DOC 22385

    LIMA, CASSIO A.; GOULART, VIVIANE P. ; CORREA, LUCIANA; ZEZELL, DENISE M. . Using fourier transform infrared spectroscopy to evaluate biological effects induced by photodynamic therapy. Lasers in Surgery and Medicine, v. 48, p. 538-545, 2016.

    Palavras-Chave: aminolevulinic acid; carcinomas; fourier transform spectrometers; infrared spectrometers; biological effects; therapy; in vivo; animals; mice; lasers

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  • IPEN-DOC 22490

    CORDEIRO, THIAGO da S. ; MATOS, RICARDO A. de; SILVA, FLAVIA R. de O. ; VIEIRA JUNIOR, NILSON D. ; COURROL, LILIA C. ; SAMAD, RICARDO E. . Using femtosecond lasers to modify sizes of gold nanoparticles. In: ANDREWS, DAVID L. (Ed.); MUNZI, JEAN-MICHEL (Ed.); OSTENDORF, ANDREAS (Ed.) NANOPHOTONICS, 6th, April 3, 2016, Brussels, Belgium. Proceedings... Society of Photo-optical Instrumentation Engineers, 2016. p. 988439-1 - 988439-9. (SPIE Proceedings Series, 9884).

    Palavras-Chave: lasers; size; gold; nanoparticles; plasmons; production; irradiation; fragmentation

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  • IPEN-DOC 22982

    MOSCA, R.C. ; ZEITUNI, C.A. ; LIMA, L.J.; COSTA, F.C.; RIBEIRO, M.S. . Using AlGaInP laser in cutaneous radionecrosis healing induced by 125I seed in an athymic murine model. In: WORLD ASSOCIATION FOR LASER THERAPY, November 6-9, 2016, São Sebastião, SP. Abstract... 2016.

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  • IPEN-DOC 22845

    SILVA, SIRLANE G. da ; SILVA, JULIO C.M. ; BUZZO, GUILHERME S.; NETO, ALMIR O. ; ASSUMPÇAO, MONICA H.M.T.. Use of PtAu/C electrocatalysts toward formate oxidation: electrochemical and fuel cell considerations. Materials for Renewable and Sustainable Energy, v. 5, n. 15, p. 1-8, 2016. DOI: 10.1007/s40243-016-0079-8

    Abstract: This study reports the use of PtAu/C electrocatalysts with different atomic ratios (90:10, 70:30 and 50:50) supported on Vulcan XC 72 carbon and prepared by the sodium borohydride method toward formate electrooxidation in alkaline media. The materials were characterized by X-ray diffraction, showing peaks characteristics of Pt and Au face-centered-cubic structures, and also by transmission electron micrographs that show the nanoparticles well dispersed on carbon and a mean particle size between 4 and 5 nm for all electrocatalysts. Electrochemical experiments show PtAu/C as promising catalysts toward formate oxidation, while single cell experiments reveal PtAu/C 90:10 as the best material since it provides a power density higher than Pt/C. The incorporation of Au could increase formate oxidation for more than one reason: (i) a facilitated rupture of C–H bond; (ii) the Au/oxide interface or (iii) by regenerating active sites.

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  • IPEN-DOC 23091

    MUNHOZ JUNIOR, A.H.; MARTINS, J.S.; RIBEIRO, R.R.; MIRANDA, L.F.; ANDRADES, R.C.; BERTACHINI, K.C.; SILVA, L.G.A. . Use of pseudoboehmite nanoparticles for drug delivery system of glucantime (R). Journal of Nano Research, v. 38, p. 47-51, 2016. DOI: 10.4028/www.scientific.net/JNanoR.38.47

    Abstract: Recently, the incidence of American Cutaneous Leishmaniasis (ACL) has been grown in Latin America, especially in Brazil, where from 1980 to 2005, 605,062 cases were recorded. The drug glucantime (R), whose active principle is the meglumine antimoniate (or meglumine antimonate) is used in the treatment of leishmaniasis. Its toxicity is due mainly to the presence of antimony in its structure. Therefore, it is crucial to determine the safe dose levels of this drug in the treatment. Drug delivery systems have been currently the focus of many studies due to its effectiveness in treating diseases proved to be superior compared to conventional methods. Drug delivery systems can avoid overdosing by decreasing the amount of drug intake, which results in a better therapeutic effect in addition to reducing the risks of plasma concentration reaching toxic levels. Synthetic nanomaterials have been receiving great attention due to their potential applications in pharmaceutical technology as well as the possibility of controlling their particle size and composition, which allows a better performance in drug release. Pseudoboehmite is a synthetic aluminum compound precursor of alumina [1] and a polymorph of boehmite, with active groups in its structure [2], making it an excellent adsorbent material. In this work, pseudoboehmite was prepared by using the sol-gel process for being used as an excipient. The incorporation of pseudoboehmite in glucantime (R) was performed in the processing of tablets. Both pseudoboehmite and the tablets were characterized via X-ray diffraction (XRD), differential thermal analysis (DTA), thermogravimetric analysis (TG), and scanning electron microscopy (SEM) using secondary electron detector and EDS detector. The release profile was obtained by UV/Vis spectroscopy for in vitro simulation. No reaction between the drug and the excipient was observed.

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  • IPEN-DOC 22492

    CASTRO, LILIANA ; MOREIRA, EDSON G. ; VASCONCELLOS, MARINA B.A. . Use of INAA in the homogeneity evaluation of a bovine kidney candidate reference material. In: INTERNATIONAL CONFERENCE ON RADIOANALYTICAL AND NUCLEAR CHEMISTRY, 1st, April 10-16, 2016, Budapest, Hungary. Abstract... 2016. p. 151.

    Palavras-Chave: evaluation; neutron activation analysis; cattle; kidneys; calibration standards; meat; animals; inorganic compounds; multi-element analysis; homogenization methods

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  • IPEN-DOC 23954

    TAKIISHI, HIDETOSHI ; GÊNOVA, LUIS A. ; CAVALHEIRA, ELTON D. ; COTRIM, MARYCEL B. ; SANTO, WILSON; LAINETTI, PAULO E. O.. Use of dopants for thoria sintering temperature reduction-characterization of THO2. Journal of Energy and Power Engineering, v. 10, p. 740-745, 2016. DOI: 10.17265/1934-8975/2016.12.004

    Abstract: Thorium is nearly three times more abundant than uranium in the Earth’s crust. Some papers evaluate the thorium resources in Brazil over 1,200,000 metric t. These figures mean that the country is probably the biggest thorium resource in the world, with only part of the territory prospected. Nevertheless, Brazil has not a research program for use of thorium in nuclear reactors, even having dedicated special attention to the subject in the beginning of its nuclear activities, in the fifties and sixties. From 1985 until 2003 IPEN operated a pilot plant for thorium nitrate production and purification, used by Brazilian industry for production of gas mantles. This facility produced over 170 metric t of thorium nitrate. Despite the non-nuclear application, the pilot plant was unique in the southern hemisphere. On the other hand, Brazil has the biggest world niobium resources. The Brazilian thorium and niobium resources added to the predictable future importance of alternative fissile materials have motivated this research, since uranium is a finite resource if used in the present thermal nuclear reactors. Besides this, thorium oxide is an important nuclear reactor material. It is a refractory oxide and its ceramic fabrication process involves a very high temperature sintering treatment considering that thoria melting point is very high (3,650 K). Cations of elements of the group VB (V, Nb and Ta) have a known effect in the reduction of thoria sintering temperature. IPEN has initiated an investigation about the use of niobium as a dopant for thoria sintering temperature reduction. The thoria used in the research was produced in the IPEN’s pilot plant and different amounts of niobium oxide (Nb2O5) will be added to thoria by different routes. The powders will be compressed and the compacted pellets will be sintered at different temperatures. The influence of the different parameters in the density of sintered pellets is being investigated. This paper presents the chemical and physical characterization for the thoria used in the investigation.

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  • IPEN-DOC 23511

    TAKIISHI, HIDETOSHI ; GENOVA, LUIS A. ; CAVALHEIRA, ELTON D. ; COTRIM, MARYCEL B. ; SANTOS, WILSON ; LAINETTI, PAULO E.O. . Use of dopants for thoria sintering temperature reduction-characterization of THO2. Journal of Energy and Power Engineering, v. 10, n. 12, p. 740-745, 2016. DOI: 10.17265/1934-8975/2016.12.004

    Abstract: Thorium is nearly three times more abundant than uranium in the Earth’s crust. Some papers evaluate the thorium resources in Brazil over 1,200,000 metric t. These figures mean that the country is probably the biggest thorium resource in the world, with only part of the territory prospected. Nevertheless, Brazil has not a research program for use of thorium in nuclear reactors, even having dedicated special attention to the subject in the beginning of its nuclear activities, in the fifties and sixties. From 1985 until 2003 IPEN operated a pilot plant for thorium nitrate production and purification, used by Brazilian industry for production of gas mantles. This facility produced over 170 metric t of thorium nitrate. Despite the non-nuclear application, the pilot plant was unique in the southern hemisphere. On the other hand, Brazil has the biggest world niobium resources. The Brazilian thorium and niobium resources added to the predictable future importance of alternative fissile materials have motivated this research, since uranium is a finite resource if used in the present thermal nuclear reactors. Besides this, thorium oxide is an important nuclear reactor material. It is a refractory oxide and its ceramic fabrication process involves a very high temperature sintering treatment considering that thoria melting point is very high (3,650 K). Cations of elements of the group VB (V, Nb and Ta) have a known effect in the reduction of thoria sintering temperature. IPEN has initiated an investigation about the use of niobium as a dopant for thoria sintering temperature reduction. The thoria used in the research was produced in the IPEN’s pilot plant and different amounts of niobium oxide (Nb2O5) will be added to thoria by different routes. The powders will be compressed and the compacted pellets will be sintered at different temperatures. The influence of the different parameters in the density of sintered pellets is being investigated. This paper presents the chemical and physical characterization for the thoria used in the investigation.

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  • IPEN-DOC 23669

    NAVILLE, WILLIAM ; COSTA, ISOLDA . Uniaxial deformation effect on the fatigue-corrosion resistance of the ISO 5832-1 stainless steel for biomaterials application. In: WORLD BIOMATERIALS CONGRESS, 10th, May 17-22, 2016, Montreal, Canada. Abstract... 2016.

    Abstract: Plastic deformation processes modify the material fatigue-life behavior. The combination of this effect with the presence of a corrosive environment affects the material fatigue-corrosion behavior through changes in the surface material condition by slip bands creation and the interaction with surface inclusions and corrosive medium. It is expected that different directions of uniaxial deformation have different effects on the corrosion-fatigue behavior of the material once the extent of surface interactions are different in each case. In this study, the effect of uniaxial deformation direction on the fatigue-corrosion resistance of the ISO 5832-1 stainless steel, bone plate material used in orthopedic surgery, has been investigated. Specimens were submitted to, either, compression plastic deformation or tensile plastic deformation and then the corrosion-fatigue behavior was evaluated. The fatigue-corrosion tests were carried out under a flux of the corrosive environments, either deionized water or 0.9 wt% NaCl solution. Specimens as received (without uniaxial deformation) were also submitted to fatigue-corrosion test for comparison reasons. The results did not show a significant effect of the corrosion environment on the fatigue test since similar results were obtained in both environments used. The compression plastic deformation decreased the fatigue life in comparison to the tensile plastic deformation, but both, compression, and tensile plastic deformation increased the fatigue life comparatively to the as-received material suggesting a beneficial effect of the deformation on the fatigue properties of the studied material.

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  • IPEN-DOC 23574

    MARQUES, J.R. ; VILLA-SOARES, S.M.; STELLATO, T.B.; SILVA, T.B.S.C.; FAUSTINO, M.G.; MONTEIRO, L.R. ; PIRES, M.A.F. ; COTRIM, M.E.B. . Uncertainty Estimation of Metals and Semimetals Determination in Wastewater by Inductively Coupled Plasma Optical Emission Spectrometry (ICP-OES). In: BRAZILIAN CONGRESS ON METROLOGY, 8th, 29 de novembro - 04 de dezembro, 2015, Bento Gonçalves, RS. Proceedings... 2016. p. 1-5.

    Abstract: The measurement uncertainty is a parameter that represents the dispersion of the results obtained by a method of analysis. The estimation of measurement uncertainty in the determination of metals and semimetals is important to compare the results with limits defined by environmental legislation and conclude if the analytes are meeting the requirements. Therefore, the aim of this paper is present all the steps followed to estimate the uncertainty of the determination of amount of metals and semimetals in wastewater by Inductively Coupled Plasma Optical Emission Spectrometry (ICP-OES). Measurement uncertainty obtained was between 4.6 and 12.2% in the concentration range of mg.L-1.

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  • IPEN-DOC 23572

    FAUSTINO, MAINARA G. ; MARQUES, JOYCE R. ; MONTEIRO, LUCILENA R. ; STELLATO, THAMIRIS B. ; SOARES, SABRINA M.V.; SILVA, TATIANE B.S.C. ; SILVA, DOUGLAS B. da ; PIRES, MARIA A.F. ; COTRIM, MARYCEL E.B. . Uncertainty estimation in the determination of metals in superficial water by ICP-OES. In: BRAZILIAN CONGRESS ON METROLOGY, 8th, 29 de novembro - 04 de dezembro, 2015, Bento Gonçalves, RS. Proceedings... Bristol, UK: IOP Publishing, 2016. p. 1-8.

    Abstract: From validation studies, it was possible to estimate a measurement uncertainty of several elements such as Al, Ba, Ca, Cu, Cr, Cd, Fe, Mg, Mn, Ni and K in water samples from Guarapiranga Dam. These elements were analyzed by optical emission spectrometry with inductively coupled plasma (ICP-OES). The value of relative estimated uncertainties were between 3% and 15%. The greatest uncertainty contributions were analytical curve, and the recovery method, which were related with elements concentrations and the equipment response. Water samples analyzed were compared with CONAMA Resolution #357/2005.

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  • IPEN-DOC 22394

    PRATES, RENATO ; SANTOS, CAMILA; ARANHA CHAVES, VICTOR; RIBEIRO, MARTHA ; KATO, ILKA . Ultrastructural changes following antimicrobial photodynamic therapy on Candida albicans. Lasers in Surgery and Medicine, v. 48, n. 4, p. 457-458, 2016.

    Palavras-Chave: ultrastructural changes; therapy; candida; transmission electron microscopy; evaluation; methylene blue; cell constituents

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  • IPEN-DOC 23278

    MONTILLA-ROSERO, ELENA; LOPES, FABIO ; GUEDES, ANDERSON; HOELZEMANN, JUDITH; HENRIQUE, JOSE; GERRERO-RASCADO, JUAN L.; ALADOS, LUCAS; LANDULFO, EDUARDO . Tropospheric vertical profiles of aerosol optical parameter at Brazilian Northeastern: preliminary results. In: WORKSHOP ON LIDAR MEASUREMENTS IN LATIN AMERICA, 9th, July 17-22, 2016, Santos, SP. Abstract... 2016.

    Abstract: For understanding the dust transport processes and retrieving essential data for continuing validation and improvement of satellite products as for evaluating and improving aerosol and dust simulations with global and regional models as well, a multi-wavelength elastic depolarizing LIDAR system, developed by the Center of lasers and applications at IPEN, has been collocated with a sunphotometer CIMEL at Natal, northeastern city of Brazil. Through vertical profiling of dust optical and microphysical properties i.e, backscatter and extinction coefficients and particle depolarization ratio at 532 nm, the LIDAR system is planned to be a crucial point for progress on the assessment of aerosol radiative impact and aerosol-cloud interaction research. In this work, the first measurements carried out with the depolarization channels during February, March and April 2016, and the retrieved vertical profiles of aerosol backscatter coefficient are presented. Three-dimensional air mass back trajectory analysis was also conducted to determine the source regions of aerosols observed during this study.

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  • IPEN-DOC 23694

    TEOTONIO, ERCULES E.S.; COSTA, ISRAEL F.; MOURA, JANDEILSON L.; FAUSTINO, WAGNER M.; CREMONA, MARCO; ADENES, RIAN E.; AVILA, HAROLDO J.C.; BRITO, HERMI F.; FELINTO, MARIA C.F.C. . Tris(2-Acyl-1,3-indandionate)aluminum(III) complexes as emitting layer in electroluminescent devices. In: BRAZILIAN MEETING ON INORGANIC CHEMISTRY, 18th, September 25-30, 2016, São Pedro, SP. Abstract... 2016.

    Abstract: This work reports about syntheses, characterization, Photo (PL) - and electroluminescence (EL) properties of the complexes presenting general formula [Al(aind)3], where aind: 2- acetyl-1,3-indandionate (acind), 2-propyl-1,3-indandionate (propind), 2-benzoyl-1,3- indandionate (bind) or 2-(4-methyl)benzoyl-1,3-indandionate (mbind). These complexes were characterized by elemental analyses, Fourier-infrared absorption spectroscopy, thermogravimetric analyses. The bilayer electroluminescent devices were prepared with the following configuration ITO/NPB/[Al(aind)3]/LiF/Al, where NPB is N,N-bis-1-naphhyl-N,N -diphenyl-1,1-bifenil-4,4-diamina. The photoluminescent spectra of all complexes are characterized by overlapped broad bands arising from both fluorescence (around 640 nm) and phosphorescence (around 525 nm) phenomena (Fig. 1 (a)). On the other hand, their OLEDs exhibited only a high electroluminescence intense band in the red spectral region that may be assigned to the phosphorescence from acyl-1,3-indandionate ligands (Fig. 1 (b)). These data reflects the highest population of excited triplet state when the complexes are electrically excited. Furthermore, the OLEDs presented emission from low tension (~12V), reaching the highest intensity around 16 V. According with these results, the tris(2-Acyl-1,3- indandionate)aluminum(III) complexes act as both efficient electron transporters and emitting layers.

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  • IPEN-DOC 23925

    SUZIN E SILVA, MIRNA M. ; CARVALHO, ELITA F.U. de ; RIELLA, HUMBERTO G. . Tratamento oxidativo em águas residuais da mineração de urânio com oxidação avançada de ozônio. In: PINHEIRO, ALEX G. (Colab.); SILVA, CARLA M. (Colab.); MENDES, ERLON (Colab.); WAJC, ISAC M. (Colab.); YAMANAKA, MARCOS H. (Colab.); QUADRI, MARINTHO B. (Colab.); SUZIN E SILVA, MIRNA M. (Colab.); GUIMARAES, NATALIA R. (Colab.); MOREIRA JUNIOR, PAULO F. (Colab.); MANFIOLETTI, SUELEN Z. (Colab.)ANGIOLETTO, ELIDIO (Coord.); CARVALHO, ELITA F.U. de (Coord.); BIAZINI FILHO, FRANCISCO L. (Coord.); LAGE FILHO, FREDERICO A. (Coord.); RIELLA, HUMBERTO G. (Coord.); SANTOS, IVAN (Coord.); DEPINTOR, JOSE C. (Coord.); BOSCOV, MARIA E.G. (Coord.); MENASCE, SAMY (Coord.); . Ozônio na recuperação de solos e recursos hídricos contaminados por mineração. Criciúma, SC: UNESC, 2016. p. 71-109,

    Observação: Livro na íntegra disponível. Consulte a biblioteca do IPEN.

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  • IPEN-DOC 21317

    METAIRON, S. ; ZAMBONI, C.B. ; SUZUKI, M.F. ; BUENO JUNIOR, C.R.; ANDRADE, T.O.; CANGUSSU, E.B.; ZATZ, M.. Tracking inorganic elements in GRMD blood dogs submitted to hASCs investigated by NAA technique. Journal of Radioanalytical and Nuclear Chemistry, v. 307, n. 3, p. 1645-1649, 2016.

    Palavras-Chave: blood; neutron activation analysis; inorganic compounds; multi-element analysis; calcium; iron; dogs; adipose tissue; diseases; muscles

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  • IPEN-DOC 23952

    OLIVEIRA, A.E.; IWAHARA, A.; SILVA, C.J.; CRUZ, P.A.L.; POLEDNA, R.; SILVA, R.L.; LARANJEIRA, A.S.; DELGADO, J.U.; TAUHATA, L.; LOUREIRO, J.S.; TOLEDO, B.C.; BRAGHIROLLI, A.M.S.; ANDRADE, E.A.L.; SILVA, J.L.; HERNANDES, H.O.K.; VALENTE, E.S.; DALLE, H.M.; ALMEIDA, V.M.; SILVA, T.G.; FRAGOSO, M.C.F.; OLIVEIRA, M.L.; NASCIMENTO, E.S.S.; OLIVEIRA, E.M. ; HERRERIAS, R. ; SOUZA, A.A. ; BAMBALAS, E. ; BRUZINGA, W.A. . Traceability from governamental producers of radiopharmaceuticals in measuring 18F in Brazil. Applied Radiation and Isotopes, v. 109, p. 236-241, 2016. DOI: 10.1016/j.apradiso.2015.11.051

    Abstract: Since the inception of its proficiency test program to evaluate radionuclide measurement in hospitals and clinics, the National Metrology Laboratory of Ionizing Radiation-LNMRI, that represents Brazilian National Metrology Institute (NMI) for ionizing radiation has expanded its measurement and calibration capability. Requirements from the National Health Surveillance Agency from Ministry of Health (ANVISA), to producers of radiopharmaceuticals provided an opportunity to improve the full traceability chain to the highest level. Fluorodeoxyglucose (FDG-18F) is the only radiopharmaceutical simultaneously produced by all Brazilian radiopharmaceutical production centers (RPCs). By running this proficiency test, LNMRI began to provide them with the required traceability. For evaluation, the ratio of RPC to reference value results and ISO/IEC17043:2010 criteria were used. The reference value established as calibration factor on the secondary standard ionization chamber was obtained from three absolute measurements systems, and routinely confirmed in each round of proficiency test by CIEMAT/NIST liquid scintillation counting. The γ-emitting impurities were checked using a High-Purity Germanium (HPGe) detector. The results show that Brazilian RPCs are in accordance with (accuracy within 710%) the Brazilian standard for evaluation of measurements with radionuclide calibrators (CNEN NN 3.05., 2013). Nevertheless, the RPCs should improve the methodology of uncertainty estimates, essential when using the statistical criteria of ISO/IEC 17043 standard, in addition to improving accuracy to levels consistent with their position in the national traceability chain

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  • IPEN-DOC 21316

    FRANKLIN, ROBSON L.; FAVARO, DEBORAH I.T. ; DAMATTO, SANDRA R. . Trace metal and rare earth elements in a sediment profile from the Rio Grande Reservoir, São Paulo, Brazil: determination of anthropogenic contamination, dating, and sedimentation rates. Journal of Radioanalytical and Nuclear Chemistry, v. 307, n. 1, p. 99-110, 2016.

    Palavras-Chave: enrichment; metals; trace amounts; sediments; lead 210; water reservoirs; pollution; age estimation; sedimentation; neutron activation analysis

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  • IPEN-DOC 22665

    FRANKLIN, R.L.; SILVA, S.A.; FAVARO, D.I.T. ; LUIZ-SILVA, W.. Trace and some rare earth elements distribution in a sediment profile from Jurumirim Reservoir, São Paulo State, Brazil: total content and extracted phases. Journal of Radioanalytical and Nuclear Chemistry, v. 309, n. 1, p. 439-451, 2016. DOI: 10.1007/s10967-016-4785-6

    Abstract: Vertical distribution of some rare earth elements (REEs) and trace elements through a Jurumirim Reservoir sediment core is presented. REE fractionation using BCR sequential extraction protocol was performed to verify REE mobility in the environment. Three steps (exchangeable, reducible, oxidizable) and residual fractions were studied and REE distribution for each was evaluated by ICP-MS. REEs showed a higher affinity for the reducible phase. Instrumental neutron activation analysis was also applied to sediment samples to determine the total mass fraction for some REE (Ce, Eu, La, Lu, Nd, Sm, Tb, and Yb). The diagrams normalized to chondrite values were used for a REE distribution pattern evaluation.

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  • IPEN-DOC 23537

    OLIVEIRA, MARIA J.A. de ; MAIA, REGINA; BRAZ, LUCIA A.; LUGAO, ADEMAR B. ; AMATO, VALDIR S.; PARRA, DUCLERC F. . Topical treatment of cutaneous leishmaniasis: wound reduction in mice using n-methyl glucamine from pvp and nano clay membranes. Journal of Dermatology Research and Therapy, v. 2, n. 5, p. 1-4, 2016. DOI: 10.23937/2469-5750/1510036

    Abstract: Biomaterials comprise a scientific field where synthetic materials are developed for pertinent biological functions, yielding a wide diversity of new products. Although widely employed, they still require improvement for therapeutic purposes. The objective of this study was to develop poly (N-2-vinyl-pyrrolidone) (PVP), poly (vinyl alcohol) (PVAl), clay, and N-methyl glucamine hydrogels for the treatment of cutaneous leishmaniasis. The characterization techniques used were tumescence, energy-dispersive X-ray (EDX) spectroscopy. Clay and antimoniate were found to disperse homogeneously in the polymeric matrix. Evaluation of cytotoxicity showed negative result. The in vivo tests used 12 BALB/c infected with 3 × 104 amastigotes/mL of L. (L.) amazonensis. All mice (4/4) from group II presented reduction of diameter wounds after submitted to PVP, PVAl, clay (1,5%), and N-methyl glucamine (2.3 mg) hydrogels, differently from group I PVP, PVAl, and N-methyl glucamine (1 mg) and III (control). Classified as results of a clinical cure, drug release was efficient and such a matrix is a potential contributor to an alternative human therapy capable of increasing the quality of life of a patient who cannot use medication in the conventional way because of side effects.

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  • IPEN-DOC 23908

    DUARTE, L.F.A.; OSTANIK, P.A.G.; PAÇO, M.S.; FERREIRA, B.D.; EVANGELISTA, M.V.; MENDES, A.L.A.; NOBRE, C.R.; SEMMLER, M.G.M.C.; MOREIRA, E.G. ; PEREIRA, C.D.S.. Tolerância biológica, efeitos subletais e bioacumulação em Ucides cordatus (LINNAEUS, 1763) expostos ao metal cádmio. In: CONGRESSO BRASILEIRO DE ECOTOXICOLOGIA, 14., 07-10 de setembro, 2016, Curitiba, PR. Resumo expandido... Campinas: Sociedade Brasileira de Ecotoxicologia, 2016. p. 247-257.

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  • IPEN-DOC 23780

    ANTONIO, PATRICIA ; OLIVEIRA, RAQUEL; KHOURY, HELEN; CALDAS, LINDA . TL, OSL and TSEE of Obsidian Silicate samples, exposed to a 60Co source. In: INTERNATIONAL CONFERENCE ON SOLID STATE DOSIMETRY, 18th, July 03-08, 2016, Munich, Germany. Abstract... 2016.

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  • IPEN-DOC 22427

    ANTONIO, PATRICIA L. ; GRONCHI, CLAUDIA C.; OLIVEIRA, RAQUEL A.P.; KHOURY, HELEN J.; CALDAS, LINDA V.E. . TL and OSL dosimetric properties of Opal gemstone for gamma radiation dosimetry. Radiation Measurements, v. 90, p. 219-223, 2016.

    Palavras-Chave: thermoluminescence; opals; luminescence; gamma radiation; dosimetry; x-ray diffraction; scanning electron microscopy; x-ray spectroscopy; australia; cobalt 60; dosemeters

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  • IPEN-DOC 23051

    CARDOSO-GUSTAVSON, POLIANA; FERNANDES, FRANCINE F.; ALVES, EDENISE S.; VICTORIO, MARIANA P.; MOURA, BARBARA B.; DOMINGOS, MARISA; RODRIGUES, CAROLINE A.; RIBEIRO, ANDREZA P.; NIEVOLA, CATARINA C.; FIGUEIREDO, ANA M.G. . Tillandsia usneoides: a successful alternative for biomonitoring changes in air quality due to a new highway in São Paulo, Brazil. Environmental Science and Pollution Research, v. 23, n. 2, p. 1779-1788, 2016. DOI: 10.1007/s11356-015-5449-8

    Observação: Editorial Note (arquivo anexado) em 2017, 24:12015. DOI: 10.1007/s11356-017-9033-2.

    Abstract: Tillandsia usneoides is an aerial epiphytic bromeliad that absorbs water and nutrients directly from the atmosphere by scales covering its surface. We expanded the use of this species as a broader biomonitor based on chemical and structural markers to detect changes in air quality. The usefulness of such comprehensive approach was tested during the construction and opening of a highway (SP-21) in São Paulo State, Brazil. The biomonitoring study was performed from 2009 to 2012, thus comprising the period during construction and after the highway inauguration. Metal accumulation and structural alterations were assessed, in addition to microscopy analyses to understand the metal chelation in plant tissues and to assess the causes of alterations in the number and shape of scale cells. Altogether, our analyses support the use of this species as a wide biomonitor of air quality in urbanized areas.

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  • IPEN-DOC 23519

    LAINETTI, PAULO E.O. . Thorium and its future importance for nuclear energy generation. Journal of Energy and Power Engineering, v. 10, n. 10, p. 600-605, 2016. DOI: 10.17265/1934-8975/2016.10.003

    Abstract: Thorium was discovered in 1828 by the Swedish chemist Jons J. Berzelius. Despite some advantages over uranium for use in nuclear reactors, its main use, in the almost two centuries since its discovery, thorium was restricted to use for gas mantles, especially in the early 20th century. In the beginning of the nuclear era, many countries had interested on thorium, particularly during the 1950-1970 period. There are about 435 nuclear reactors in the world nowadays. They need more than 65,000 tons of uranium yearly. The future world energy needs will increase and, even if we assumed a conservative contribution of nuclear generation, there will be a significant increasing in the uranium prices occur, taking into account that uranium, as used in the present thermal reactors, is a finite resource. Thorium is nearly three times more abundant than uranium in the Earth’s crust. Despite thorium is not a fissile material, 232Th can be converted to 233U (fissile) more efficiently than 238U to 239Pu. Besides this, since it is possible to convert thorium waste into non-radioactive elements, thorium is an environment-friendly alternative energy source. Thorium fuel cycle is also inherently resistant to proliferation. Some papers evaluate the thorium resources in Brazil over 1,200,000 metric t. Then, the thorium alternative must be seriously considered in Brazil for strategic reasons. In this paper a brief history of thorium is presented, besides a review of the world thorium utilization and a discussion about advantages and restrictions of thorium use.

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  • IPEN-DOC 22510

    JUNOT, DANILO O.; BARROS, JADSON P.; CALDAS, LINDA V.E. ; SOUZA, DIVANIZIA N.. Thermoluminescent analysis of CaSO4:Tb,Eu crystal powder for dosimetric purposes. Radiation Measurements, v. 90, p. 228-232, 2016.

    Palavras-Chave: thermoluminescence; dosimetry; doped materials; calcium sulfates; terbium; europium; crystals; x-ray diffraction; radioluminescence; feasibility studies; crystal growth

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  • IPEN-DOC 23648

    FERMINO, DANILO M.; ANDRADE, CHRISTIANO G.B.; PARRA, DUCLERC F. ; LUGAO, ADEMAR B. ; VALENZUELA DIAZ, FRANCISCO R.. Thermal properties of polypropylene nanocomposites with organoclay and discarded bond paper. In: IKHMAYIES, SHADIA J. (Ed.); LI, BOWEN (Ed.); CARPENTER, JOHN S. (Ed.); HWANG, JIANN-YANG (Ed.); MONTEIRO, SERGIO N. (Ed.); LI, JIAN (Ed.); FIRRAO, DONATO (Ed.); ZHANG, MINGMING (Ed.); PENG, ZHIWEI (Ed.); ESCOBEDO-DIAZ, JUAN P. (Ed.); BAI, CHENGUANG (Ed.) TMS ANNUAL MEETING & EXHIBITION, 145th; CHARACTERIZATION OF MINERALS, METALS, AND MATERIALS, February 14-18, 2016, Nashville, Tennessee, USA. Proceedings... Hoboken, New Jersey: John Wiley & Sons, Inc., 2016. p. 241-248.

    Abstract: This work concerns the study of the effect of discarded bond paper on the thermal behavior of the polypropylene/organophilic clay nanocomposite. A brown polycationic bentonite from state of Paraíba, Brazil, was treated industrially with sodium carbonate to transform it into a bentonite which swells in water and then treated with ammonium chloride hexadecyltrimethylammonium to turn it into a swellable organoclay in organic liquids. Polypropylene with 3% polypropylene graft compatibilizer (PP-g-AM) was mixed with 1% and 2% by weight of discarded bond paper and with 1%, 2% e 5% by weight of organophilic clay using a twin-screw extruder. The specimens were prepared by the injection process. The nanocomposite specimens were characterized by XRD, SEM, and thermal analysis (ATG and DSC). The nanocomposites showed improved thermal properties compared with the polymer without filler.

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  • IPEN-DOC 22996

    OLIANI, WASHINGTON L. ; KOMATSU, LUIZ G.H. ; LUGAO, ADEMAR B. ; PARRA, DUCLERC F. . Thermal ageing and accelerated weathering of HMSPP: structural and morphological studies. Macromolecular Symposia, v. 367, n. 1, p. 18-23, 2016. DOI: 10.1002/masy.201500135

    Abstract: This work focuses of the influence of weathering factors UV radiation, humidity, and temperature on the structure and morphology poly(propylene) (PP) with high melt strength (HMSPP), also called poly(propylene) modified by irradiation. The HMSPP was prepared from isotactic poly(propylene) (iPP) in presence of acetylene at 110 kPa pressure and irradiated with g of 60Co at doses of 5, 12.5 and 20 kGy. It has been observed that HMSPP deteriorates in the weathering and thermal resistance, and the long-term stability of HMSPP, beyond substantial color changes. The aged samples were characterized by infrared spectroscopy (FTIR), optical microscopy (OM) and differential scanning calorimetry (DSC). The optical microscopy shows different mechanisms on thermal and artificial weathering ageing. The ageing result under elevated temperature in HMSPPs exposed surfaces follows the order: HMSPP 20>12.5>5 kGy>iPP. The intense crack formation in surface exposed justifies thermooxidative degradation.

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  • IPEN-DOC 22899

    PEREIRA, D.L.; ZAMATARO, C.B. ; ZEZELL, D.M. ; FREITAS, A.Z. ; ANA, P.A.. The use of Nd:YAG laser as an alternative to prevent dentin wear. In: LATIN AMERICA OPTICS AND PHOTONICS CONFERENCE, August 22-26, 2016, Medellín, Colombia. Proceedings... Washington, DC, USA: OSA, 2016.

    Abstract: The aim of this study is to verify the potential of Nd:YAG laser and topical acidulated phosphate fluoride application (APF) on preventing dentin wear using the optical coherence tomography (OCT) on monitoring this process.

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  • IPEN-DOC 22449

    PINTO, NATHALI C.; CHAVANTES, M.C.; ZEZELL, DENISE ; DEANA, ALESSANDRO; BENETTI, CAROLINA ; MARCOS, RODRIGO L.; LOPES, LUCIANA A.; MARTINS, A.B.L.; AIELLO, VERA D.; JATENE, FABIO B.; POMERANTZEFF, PABLO M.A.. The use of a high-power laser on swine mitral valve chordae tendineae. Lasers in Medical Science, v. 31, p. 1075-1081, 2016.

    Palavras-Chave: therapeutic uses; valves; biological repair; heart; lasers; swine; in vivo; animals; histological techniques; rheumatic diseases; surgery; mechanical tests; electron microscopy

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  • IPEN-DOC 23590

    CARDOSO, Q.A.; SILVA, F.M.; VIEIRA, L.S.; CASINI, J.C.S.; SAKATA, S.K.; FARIA, R.N. . The production of reduced graphene oxide by a low-cost vacuum system for supercapacitors applications. In: CONGRESSO BRASILEIRO DE ENGENHARIA E CIENCIA DOS MATERIAIS, 22., 06-10 de novembro, 2016, Natal, RN. Proceedings... 2016. p. 4022-4029.

    Abstract: Graphene (G) has attracted great interest for its excellent electrical properties. However, the large-scale production of graphene is still currently under investigations. Graphene oxide (GO) can be partially reduced to graphene-like sheets by removing the oxygen-containing groups with the recovery of a conjugated structure. It can be produced using inexpensive graphite as raw material by cost-effective chemical methods. High vacuum and temperature (10-7mbar/1100oC) is well established as an effective route for reduced powder preparation on a laboratory scale. However, a high vacuum reduction system, which can be routinely operated at 10-7 mbar, has a considerable capital, operational and maintenance cost to be used in a large scale. In the present work, a low-cost route aiming large scale reduction of graphene oxide has been investigated. A stainless steel vessel has been evacuated to backing-pump pressure (10-2 mbar) to process graphene oxide at low and high temperatures. Attempts of reducing GO powder using low vacuum pressures have been carried out and investigated by X-ray diffraction (XRD) and Fourier transform infrared spectroscopy (FTIR). The experimental results of processing graphene oxide powder at various temperatures (200-1000°C) at relatively low pressures have been reported. The microstructures of the processed material have been investigated using scanning electron microscopy (SEM) and chemical microanalyses employing energy dispersive X-ray analysis (EDX).

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  • IPEN-DOC 22395

    LIMA, VERA M.F. de ; PEREIRA JUNIOR, ALFREDO. The plastic glial-synaptic dynamics within the neuropil: A self-organizing system composed of polyelectrolytes in phase transition. Neural Plasticity, v. 2016, p. 192427-1 - 192427-20, 2016.

    Palavras-Chave: electrolytes; membranes; brain; nervous system; mathematical models; brain; plasticity; animal cells

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  • IPEN-DOC 22450

    SABINO, CAETANO P. ; DEANA, ALESSANDRO M.; YOSHIMURA, TANIA M. ; SILVA, DANIELA F.T. da; FRANCA, CRISTIANE M.; HAMBLIN, MICHAEL R.; RIBEIRO, MARTHA S. . The optical properties of mouse skin the visible and near infrared spectral regions. Journal of Photochemistry and Photobiology, B: Biology, v. 160, p. 72-78, 2016.

    Palavras-Chave: animal tissues; spectroscopy; optics; diagnosis; therapy; radiant heat transfer; optical properties; mice; skin; near infrared radiation; infrared spectra

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  • IPEN-DOC 23395

    RIBEIRO, ALEXANDRE N.; SANTOS, GIVANILDO A. dos; NAKAMOTO, FRANCISCO Y.; KALLAS, CLAUDETE; COUTO, ANTONIO A. ; MELO, HERCILIO G. de; HERNANDEZ, ROCIO D.P.B.. The influence of the microstructure upon corrosion resistance of an Al-10wt% Si-5wt%Cu alloy. In: BRAZILIAN MRS MEETING, 15th, September 25-29, 2016, Campinas, SP. Abstract... São Carlos, SP: Aptor Software, 2016. p. 1060-1061.

    Abstract: The need of the industries achieves better specific properties of materials, make to develop studies to meet this demand. For the automotive industry the most interesting properties are low specific weight, low coefficient of thermal expansion, wear resistance at high temperatures and high corrosion resistance. In this context, new materials have been considered, in particular AlSiCu alloys. [1, 2]. In general, the corrosion behavior strongly depends on the structural morphology and chemical composition [3]. In this work, an Al-10wt%Si-5wt%Cu alloy was solidified under upward unsteady state heat flow conditions. Heat was directionally extracted only through a water-cooled bottom made of steel (SAE 1020). The aim of the present work is to investigate the influence of the microstructure of this alloy upon corrosion resistance. Experimental results include primary dendrite arm spacing (l1) and capacitances values (ZCPE). The corrosion behavior was analysed by electrochemical impedance spectroscopy technique conducted in a 3% NaCl solution at room temperature. Coarser dendritic structures tend to improve the corrosion resistance of an Al-10wt%Si-5wt%Cu alloy.

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  • IPEN-DOC 23846

    NAVARRO, RAPHAELLA; MOURA, TIAGO F.A.; YOSHITO, WALTER K. ; ICHIKAWA, RODRIGO ; MARTINEZ, LUIZ G. ; MATOS, RONALDO V.R.; MIRANDA, JOSE R. de A.; SAEKI, MARGARIDA J.. The influence of synthesis parameters on the structure and acb response of Mn0.75 Zn0.25FeyO4 ferrite. In: INTERNATIONAL MATERIALS RESEARCH CONGRESS, 25th, August 14-19, 2016, Cancún, Mexico. Abstract... 2016.

    Abstract: The interest to use magnetic nanoparticles in biomedicine has increased due to their inducible magnetic properties[1-4]. In the treatment of certain diseases as cancer, it has been used to constitute drug carrier systems[2,3] as well as hyperthermia agents[3,4]. These materials can also be used as a tracer in the diagnosis by Magnetic Resonance Imaging (MRI)[3,4] and Alternating Current Biosuceptometry (ACB)5, which are techniques that do not use ionizing radiation. Neverthless, the sensitivity of these techniques depend on the magnetic susceptibility of tracers. In this work, the ferrite nanoparticles with the composition of Mn0.75Zn0.25FeyO4 (ferrite), where 1.5 ? y ? 2.8, were synthesized by the co-precipitation method and the influence of iron content, reaction time and concentration of precipitating agent on the structure and ACB response was analyzed. It was noted that the synthesis using alkaline metal hydroxide between 0.1 and 0.2 mol/L provides single-phase materials with spinel structure [ICSD 28515 (PDF - 742 402), space group Fd3m]. The higher concentration (0.2 mol/L) leads to materials with higher crystallinity and adequate performance for the ACB technique. The longer the reaction time the greater is the magnetic susceptibility for compositions wherein the iron is in excess (y>2.0). Also, the susceptibility is higher for ferrites with excess of iron.

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  • IPEN-DOC 23109

    SANTOS, W.S. ; GONALVES, P.E.; BELINATO, W.; CALDAS, L.V.E. ; PERINI, A.P.; NEVES, L.P. . The influence of different 192Ir sources geometries to the energy deposition. Journal of Physics: Conference Series, v. 733, p. 1-5, 2016. DOI: 10.1088/1742-6596/733/1/012092

    Abstract: In this paper, various simpli cations of the HDR source Varian VariSource Classic model, in which 192Ir as a radionuclide is used, were compared. These simpli cations were carried out by Monte Carlo simulations, using the MCNPX 2.7.0 code. The different sources were compared through a distribution of energy deposition in a water phantom. Our results indicated that small simpli cations will present no in uence on the source response, and the removal of the entire capsule surrounding the radionuclide will present a difference of just 0.53% in the nal response.

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  • IPEN-DOC 22448

    AMATO LOURENCO, LUIS F.; MOREIRA, TIANA C.L.; SOUZA, VANESSA C. de O.; BARBOSA JUNIOR, FERNANDO; SAIKI, MITIKO ; SALDIVA, PAULO H.N.; MAUAD, THAIS. The influence of atmospheric particles on the elemental content of vegetables in urban gardens of Sao Paulo, Brazil. Environmental Pollution, v. 216, p. 125-134, 2016.

    Palavras-Chave: earth atmosphere; particles; vegetables; brazil; pollution; food; risk assessment; icp mass spectroscopy; horticulture; multi-element analysis

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  • IPEN-DOC 22383

    EFFENBERGER, FERNANDO B.; CARBONARI, A.W. ; ROSSI, L.M.. The influence of 1,2-alkanediol on the crystallinity of magnetite nanoparticles. Journal of Magnetism and Magnetic Materials, v. 417, p. 49-55, 2016.

    Palavras-Chave: alkanes; magnetite; nanoparticles; iron oxides; x-ray diffraction; transmission electron microscopy; magnetization; mathematical models

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  • IPEN-DOC 23580

    SANTOS, W.S. ; GONALVES, P.E.; BELINATO, W.; CALDAS, L.V.E. ; PERINI, A.P.; NEVES, L.P. . The in uence of different 192Ir sources geometries to the energy deposition. In: BRAZILIAN CONGRESS ON METROLOGY, 8th, 29 de novembro - 04 de dezembro, 2015, Bento Gonçalves, RS. Proceedings... Bristol, UK: IOP Publishing, 2016. p. 1-5.

    Abstract: In this paper, various simpli cations of the HDR source Varian VariSource Classic model, in which 192Ir as a radionuclide is used, were compared. These simpli cations were carried out by Monte Carlo simulations, using the MCNPX 2.7.0 code. The different sources were compared through a distribution of energy deposition in a water phantom. Our results indicated that small simpli cations will present no in uence on the source response, and the removal of the entire capsule surrounding the radionuclide will present a difference of just 0.53% in the nal response.

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  • IPEN-DOC 22637

    ANDREA, V.; OLIVEIRA, P.S.P. ; SANTIAGO, E.I. ; LINARDI, M. . The impact of the operational parameters on the PEM fuel cell long-term performance. ECS Transactions, v. 71, n. 1, p. 233-238, 2016. DOI: 10.1149/07101.0233ecst

    Abstract: Durability represents one of the major barriers to the progress of the Proton Exchange Membrane Fuel Cells (PEMFCs). To elucidate the degradation of these devices, it is important to understand the issues regarding the long-term operation of PEMFCs. Thus, in this work it was analyzed the influence of the operational parameters such as relative humidity, cell temperature and the reactant flow rates on the long-term performance through experiments of 500 hours at steady state. It was observed that the degree of humidification strongly influences on the long-term performance. The test which presented the lowest global loss of performance (with both irreversible and reversible losses) was the one with the temperatures of the humidifiers and cell all set as 75°C and the reactants flow rates set as 300 and 200 ml.min-1 for the H2 and O2, respectively. Therefore, the water management is a key point in order to obtain better performances in long-term operation of PEMFCs.

    Palavras-Chave: proton exchange membrane fuel cells; performance; humidity; heat; flow rate

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  • IPEN-DOC 22818

    SILVA, FLAVIA R. de O. ; LIMA, NELSON B. ; COURROL, LILIA C.; BRESSIANI, ANA H. de A. . The hydroxyapatite and beta- tricalcium phosphate ratio in europium-doped biphasic calcium phosphate controlled by ph value during the coprecipitation synthesis. In: CONGRESSO BRASILEIRO DE CERAMICA, 60., 15-18 de maio, 2016, Aguas de Lindóia, SP. Resumo... 2016.

    Abstract: Calcium phosphates are chemical compounds of special interest in medicine, since they are the major inorganic component of all mammalian calcified tissues. The most widely used synthetic calcium phosphate-based bioceramics are hydroxyapatite [HA, Ca10(PO4)6(OH)2] and beta-tricalcium phosphate [BTCP, Ca3(PO4)2]. HA is stable in a body fluid, while BTCP is rather soluble. Obtain a fluorescent HA and BTCP nanoparticles offer the attractive possibilities for continuous and nondestructive bioimaging observations, which is helpful for monitoring the implanted subject and the delivering progression of drug carriers. In particular, HA and BTCP can be used as luminescent materials when activated by Eu3+ ions in substitution of Ca2+ ions. Herein, the Eu3+ ions doped HA and BTCP nanoparticles were synthesized by co-precipitation method. The phase composition were analyzed by X-ray diffraction (XRD) using a Multiflex Rigaku diffractometer, transmission electronic microscopy (JEM 2010 –JEOL) and scanning electron microscopy (FEG, JSM 6701F – JEOL). Fluorescence spectroscopy was carried out, at room temperature, in a Fluorolog 3 Fluorimeter from Jobin Yvon in order to investigate the fluorescence emission of the HA-Eu, BTCP-Eu and biphasic compounds. The as-synthesized nanopowders have shown only the hexagonal phase of HA, for all samples. After the thermal treatment at 1000°C, the XRD shows the HA, BTCP and HA/BTCP patterns depending on the pH of the synthesis. Eu-doped HA exhibited a red-orange emission at 575 nm with several minor peaks at 610–640 nm, while Eu-doped BTCP had an unexpected strong red emission at 610-620 nm and a secondary band at 590–600 nm, almost 20-fold higher than HA. This efficient fluorescence of BTCP could be useful for the imaging with biomaterials for therapeutic and diagnostic applications. The biphasic one shows a mixture of the spectra, and the more the BTCP phase, the higher the red emission at 610-620nm.

    Palavras-Chave: apatites; calcium phosphates; europium compounds; ph value; coprecipitation; synthesis; europium ions; nanoparticles; x-ray diffraction; scanning electron microscopy; fluorescence spectroscopy

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  • IPEN-DOC 23394

    RIBEIRO, ALEXANDRE N.; KALLAS, CLAUDETE; SANTOS, GIVANILDO A. dos; NAKAMOTO, FRANCISCO Y.; MORO, JOAO R.; COUTO, ANTONIO A. ; MELO, HERCILIO G. de. The effect of the microstructure upon corrosion resistance of an Al-10wt% Si-2wt%Cu alloy. In: BRAZILIAN MRS MEETING, 15th, September 25-29, 2016, Campinas, SP. Abstract... São Carlos, SP: Aptor Software, 2016. p. 1062-1062.

    Abstract: In general, the corrosion behavior strongly depends on the structural morphology and chemical composition. The literature shows relationships between the corrosion behavior and the structural morphology of the secondary dendrite spacing [1]. The objective of this study is to investigate the influence of the microstructure of an Al-10wt%Si-2wt%Cu alloy in its corrosion resistance. In this work, an Al-10wt%Si-2wt%Cu alloy was solidified under upward unsteady state heat flow conditions. Heat was directionally extracted only through a watercooled bottom made of steel (SAE 1020). The aim of the present work is to investigate the influence of the microstructure of this alloy upon corrosion resistance. Experimental results include primary dendrite arm spacings (l1) and capacitances values (ZC P E ). The corrosion behavior was analysed by electrochemical impedance spectroscopy technique conducted in a 3% NaCl solution at room temperature. Coarser dendritic structures tend to improve the corrosion resistance of an Al-10wt%Si-2wt%Cu alloy.

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  • IPEN-DOC 23757

    CARDOSO, ELIZABETH C.L. ; SCAGLIUSI, SANDRA R. ; LUGAO, ADEMAR B. . The effect of gamma-radiation on biodegradability of synthetic PHB structural foams PP/HMSPP based. In: MEETING OF THE IONIZING RADIATION AND POLYMERS SYMPOSIUM, 12th, September 25-30, 2016, Peninsula of Giens, France. Abstract... 2016. p. 107-107.

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  • IPEN-DOC 22846

    SILVA, JULIO C.M. ; PIASENTIN, RICARDO M. ; SPINACE, ESTEVAM V. ; NETO, ALMIR O. ; BARANOVA, ELENA A.. The effect of antimony-tin and indium-tin oxide supports on the catalytic activity of Pt nanoparticles for ammonia electro-oxidation. Materials Chemistry and Physics, v. 180, p. 97-103, 2016. DOI: 10.1016/j.matchemphys.2016.05.047

    Abstract: Platinum nanoparticles supported on carbon (Pt/C) and carbon with addition of ITO (Pt/C-ITO (In2O3)(9)center dot(SnO2)(1)) and ATO (Pt/C-ATO (SnO2)(9).(Sb2O5)(1)) oxides were prepared by sodium borohydride reduction method and used for ammonia electro-oxidation reaction (AmER) in alkaline media. The effect of the supports on the catalytic activity of Pt for AmER was investigated using electrochemical (cyclic voltammetry and chronoamperometry) and direct ammonia fuel cell (DAFC) experiments. X-ray diffraction (XRD) showed Pt peaks attributed to the face-centered cubic (fcc) structure, as well as peaks characteristic of In2O3 in ITO support and cassiterite SnO2 phase of ATO support. According to transmission electron micrographs the mean particles sizes of Pt over carbon were 5.4, 4.9 and 4.7 nm for Pt/C, Pt/C-ATO and Pt/C-ITO, respectively. Pt/C-ITO catalysts showed the highest catalytic activity for ammonia electrooxidation in both electrochemical and fuel cell experiments. We attributed this to the presence of In2O3 phase in ITO, which provides oxygenated or hydroxide species at lower potentials resulting in the removal of poisonous intermediate, i.e., atomic nitrogen (N-ads) and promotion of ammonia electrooxidation. (C) 2016 Elsevier B.V. All rights reserved.

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  • IPEN-DOC 23548

    SENNA, MARY L.G.S. ; AQUINO, AFONSO R. . The ecological footprint of tourism in Jalapão/TO/Brazil. International Journal of Social, Behavioral, Educational, Economic, Business and Industrial Engineering, v. 10, n. 11, p. 3611-3616, 2016.

    Abstract: The development of tourism causes negative impacts on the environment. It is in this context, through the Ecological Footprint (EF) method that this study aimed to characterize the impacts of ecotourism on the community of Mateiros, Jalapão, Brazil. The EF, which consisted in its original a method to construct a land use matrix, considering some major categories of human consumption such as food, housing, transportation, consumer goods and services, and six other categories from the main land use which are divided into the topics: land use, degraded environment, gardens, fertile land, pasture and forests protected by the government. The main objective of this index is to calculate the land area required for the production and maintenance of goods and services consumed by a community. The field research was conducted throughout the year of 2014 until July 2015. After the calculations of each category, these components were added according to the presented method in order to determine the annual EF of the tourism sector in Mateiros. The results show that the EF resulting from tourism in Mateiros is 2,194.22 hectares of land required for tourism activities in the region. The EF of tourism was considered high, nevertheless, if it is added the total of hectares needed annually for tourism activities, the result found would be 2,194.22 hectares needed to absorb the CO2 emissions generated in the region directly from the tourism sector.

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  • IPEN-DOC 23705

    SENNA, MARY L.G.S. ; AQUINO, AFONSO R. . The ecological footprint of tourism in Jalapão/TO/Brazil. In: WORLD ACADEMY OF SCIENCE, ENGINEERING AND TECHNOLOGY, 18th, November 24-25, 2016, London, United Kingdom. Proceedings... 2016. p. 1739-1744.

    Abstract: The development of tourism causes negative impacts on the environment. It is in this context, through the Ecological Footprint (EF) method that this study aimed to characterize the impacts of ecotourism on the community of Mateiros, Jalapão, Brazil. The EF, which consisted in its original a method to construct a land use matrix, considering some major categories of human consumption such as food, housing, transportation, consumer goods and services, and six other categories from the main land use which are divided into the topics: land use, degraded environment, gardens, fertile land, pasture and forests protected by the government. The main objective of this index is to calculate the land area required for the production and maintenance of goods and services consumed by a community. The field research was conducted throughout the year of 2014 until July 2015. After the calculations of each category, these components were added according to the presented method in order to determine the annual EF of the tourism sector in Mateiros. The results show that the EF resulting from tourism in Mateiros is 2,194.22 hectares of land required for tourism activities in the region. The EF of tourism was considered high, nevertheless, if it is added the total of hectares needed annually for tourism activities, the result found would be 2,194.22 hectares needed to absorb the CO2 emissions generated in the region directly from the tourism sector.

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  • IPEN-DOC 22660

    PEREIRA, JONATHAS X.; AZEREDO, MARIA C.B.; MARTINS, FELIPE S.; CHAMMAS, ROGER; OLIVEIRA, FELIPE L.; SANTOS, SOFIA N.; BERNARDES, EMERSON S. ; EL-CHEIKH, MARCIA C.. The deficiency of galectin-3 in stromal cells leads to enhanced tumor growth and bone marrow metastasis. BMC Cancer, v. 16, n. 1, 2016. DOI: 10.1186/s12885-016-2679-1

    Abstract: Background: Galectin-3 is a multifunctional β-galactoside-binding lectin that once synthesized, is expressed in the nucleus, cytoplasm, cell surface and in the extracellular environment. Because of its unique structure, galectin-3 can oligomerize forming lattice upon binding to multivalent oligossacharides and influence several pathologic events such as tumorigenesis, invasion and metastasis. Methods: In our study, balb/c Lgals3+/+ and Lgals3−/− female mice were inoculated in the fourth mammary fat pad with 4T1 breast cancer cell line. The primary tumor, inguinal lymph nodes and iliac bone marrow were evaluated 15, 21 and 28 days post-injection. The primary tumor growth was evaluated by measuring the external diameter, internal growth by ultrasound and weight of the excised tumor. The presence of cancer cells in the draining lymph nodes and iliac crest bone marrow were performed by immunohistochemistry, PCR and clonogenic metastatic assay. Results: In this study we demonstrated that the deletion of galectin-3 in the host affected drastically the in vivo growth rate of 4T1 tumors. The primary tumors in Lgals3−/− mice displayed a higher proliferative rate (p < 0,05), an increased necrotic area (p < 0,01) and new blood vessels with a wider lumen in comparison with tumors from Lgals3+/+ mice (P < 0,05). Moreover, we detected a higher number of 4T1-derived metastatic colonies in the lymph nodes and the bone marrow of Lgals3−/− mice (p < 0,05). Additionally, healthy Lgals3−/− control mice presented an altered spatial distribution of CXCL12 in the bone marrow, which may explain at least in part the initial colonization of this organ in Lgals3−/− injected with 4T1 cells. Conclusions: Taken together, our results demonstrate for the first time that the absence of galectin-3 in the host microenvironment favors the growth of the primary tumors, the metastatic spread to the inguinal lymph nodes and bone marrow colonization by metastatic 4T1 tumor cells.

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  • IPEN-DOC 22830

    GOMES, LAERCIO ; FORTIN, VINCENT; BERNIER, MARTIN; VALLEE, REAL; POULAIN, SAMUEL; POULAIN, MARCEL; JACKSON, STUART D.. The basic spectroscopic parameters of Ho3+-doped fluoroindate glass for emission at 3.9 &mu;m. Optical Materials, v. 60, p. 618-626, 2016. DOI: 10.1016/j.optmat.2016.08.019

    Abstract: This report details the first study of the fundamental spectroscopic properties of a new optical material for prospective application as a gain medium for fiber laser emission at 3.9 mm. We have investigated the decay processes that are relevant to the excited states of the 5I5 / 5I6 transition in singly Ho3þ-doped InF3 (fluoroindate) glass using time-resolved fluorescence spectroscopy. The HoF3 concentration in the glass was 10 mol.%. We excited the 5I7 and 5I6 energy levels using selective excitation at 1982 nm and 1150 nm, respectively.We have established that a strong energy-transfer upconversion process by way of the well-known dipole-dipole interaction between two holmium ions excited to the 5I6 level populate the 5I5 (upper laser) level of the 3.9 mm transition. The 5I6 and 5I5 energy levels emit luminescence with measured peaks located at 2.85 mm and 3.92 mm, respectively and the luminescence efficiencies of these emissions are 78% and 0.2%, respectively. Results from numerical simulations show that for this high Ho3þ concentration, a population inversion for the 3.9 mm transition is reached only for a short time (t < 100 &mu;s) after direct upper laser level pumping at a wavelength of 889 nm.

    Palavras-Chave: spectroscopy; holmium ions; doped materials; laser materials; glass; lasers; decay; fluorescence spectroscopy; holmium fluorides; infrared spectra

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  • IPEN-DOC 22933

    LIMA, LIVIA de A. ; HIGA, OLGA Z. . Técnicas de cultura celular e teste de citotoxicidade. In: PROGRAMA INSTITUCIONAL DE BOLSAS DE INICIAÇÃO CIENTÍFICA; SEMINARIO ANUAL PIBIC, 22.; SEMINARIO ANUAL PROBIC, 13.; SEMINARIO ANUAL PIBITI, 6., 07-08 de dezembro, 2016, São Paulo, SP. Resumo expandido... São Paulo, SP: IPEN, 2016. p. 207-208.

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  • IPEN-DOC 23769

    RODAS, A.C.; GUEDES-SILVA, C.C. ; FERREIRA, T.D.; HIGA, O.Z. . Testes de citotoxicidade para avaliação in-vitro de biocompósitos de nitreto de sílicio. In: CONGRESSO LATINO-AMERICANO DE ORGAOS ARTIFICIAIS E BIOMATERIAIS, 9; CONGRESSO DA SOCIEDADE LATINO AMERICANA DE BIOMATERIAIS, ORGAOS ARTIFICIAIS E ENGENHARIA DE TECIDOS, 13., 24-27 de agosto, 2016, Foz do Iguaçu, PR. Resumo... 2016. p. 50-50.

    Abstract: O nitreto de silício (Si3N4) é um material cerâmico que se mostra promissor para utilização em próteses ortopédicas e dentais, por apresentar elevadas propriedades mecânicas, capacidade de promover osteointegração, capacidade bactericida e características radiolucentes. Com o intuito de ampliar e otimizar a utilização desses materiais na área médica, novos biocompósitos densos de nitreto de silício, contendo uma fase bioativa livre de fósforo, foram obtidos por sinterização normal. No desenvolvimento de novos materiais, testes de biocompatibilidade necessitam ser realizados. Estes testes variam de análises físico-químicas a análises biológicas. Neste trabalho, o teste de citotoxicidade, considerado o teste padrão inicial para avaliação da biocompatibilidade por análise biológica, foi realizado em diferentes amostras densas de nitreto de silício com quantidades variadas de sílica e cálcia. O teste de citotoxicidade utilizado foi a análise indireta. Neste teste foi preparada a eluição do material em meio de cultura para cultivo de células, assim é possível avaliar a presença de componentes tóxicos que podem ser lixiviados do material e que apresentam potencial tóxico. Os eluentes são colocados em contato com uma camada confluente de células cultivadas aderidas e a viabilidade celular foi medida após 24 horas utilizando-se um corante vital, o MTS (que só reage com células vivas). Para todas as amostras analisadas, nenhuma delas apresentou citotoxicidade, variando a viabilidade celular dos eluídos de 94,7 a 104%.

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  • IPEN-DOC 23646

    PESQUEIRA, E.I.O.; ROSSI, J.L. ; POLITANO, R. ; RUIZ, E.E.S.; MACHADO, M.T.. Teoria da difusão aplicada à disseminação de conhecimento. In: CONGRESSO BRASILEIRO DE ENGENHARIA E CIENCIA DOS MATERIAIS, 22., 06-10 de novembro, 2016, Natal, RN. Resumo... 2016. p. 10163.

    Abstract: O objetivo deste estudo é identificar um modelo de pesquisa capaz de explicar os determinantes da difusão de conhecimento baseada nas mídias sociais, visando o gerenciamento da implementação e a aceleração da difusão na inovação de produtos. A transferência entre agentes realça a importância do conhecimento tácito e o papel fundamental da interação face a face. A maioria das indústrias tem uma rede informal bem estabelecida por meio do qual o conhecimento é negociado. O modelo capta efeitos das inovações incrementais, e sua difusão entre uma rede de agentes heterogêneos. O conhecimento como um vetor de tipos de conhecimento, ao contrário de muitos modelos em que o conhecimento é um escalar simples. O mecanismo e os pontos fortes de ligações entre agentes alteram à medida que ganham experiência com a rede, e a estrutura da rede deve emergir podendo evoluir.

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  • IPEN-DOC 23309

    KRYLOV, V.I.; BOSCH-SANTOS, B. ; CABRERA-PASCA, G.A. ; CARBONARI, A.W. ; SAXENA, R.N. ; MESTNIK-FILHO, J. . Temperature anomalies of the hyperfine magnetic fields on 111Cd probe nuclei in ferro- and antiferromagnetic phases of the ordered FeRh alloys. In: TEMST, KRISTIAAN (Ed.); VANTOMME, ANDRE (Ed.); COTTENIER, STEFAAN (Ed.); PEREIRA, LINO (Ed.) INTERNATIONAL CONFERENCE ON HYPERFINE INTERACTIONS AND THEIR APPLICATIONS, July 3-8, 2016, Leuven, Belgium. Abstract... Leuven, Belgium: Instituut voor Kern- en Stralingsfysica, 2016.

    Abstract: FeRh ordered alloy crystallizes in the bcc B2 structure [1], presents first order phase transition from antiferromagnetic (AF) ordering at low temperature to ferromagnetic (F) state above 350 K [2], and shows significant magnetocaloric effect near RT [3]. Recently, FeRh alloy has also been considered as an interesting material for spintronics applications [4]. In the AF state, FeRh has compensated AFII-type magnetic structure with μFe=3.3 μB and μRh=0. In the F state of FeRh both Fe and Rh atoms have magnetic moments of μFe=3.2 μB and μRh=0.9 μB, respectively [5]. The Fe – Rh compounds were studied by Mössbauer spectroscopy (MS) on 57Fe [6, 7] and 119Sn probe nuclei [8]. In this work, we have, for the first time, investigated the HFs for 111Cd probe atoms in two FeRh samples of different composition by perturbed γ-γ angular correlation (PAC) spectroscopy in the range from 40 K to a temperature above the TC. The alloy Fe0.48Rh0.52 (A1 sample) is AF at low temperatures. At the temperature Tt = 345 K the first order phase transition is observed, and this compound becomes F at the temperatures lower than TC = 685 K. The alloy Fe0.52Rh0.48 (A2 sample) is only ferromagnetic below TC = 800 K. It was established that in both alloys 111Cd probes substitute only Fe ions. The HFs values extrapolated to 0 K were found to be B1(0) =8.70(5) T and B2(0) =5.53(5) T for AF and F ordering of A1 and A2 samples, respectively. The HF in the AF state is almost 60% higher than the HF in the F alloy. The dependences B1 (T) and B2 (T) show anomalous behavior. At Tt = 345 K, phase transition AF-F is accompanied by a sharp decrease in the HF at 111Cd probe nuclei. Earlier, an increase of the corresponding HFs was observed for 57Fe atoms and 119Sn impurity atoms in the region of AF-F transition by MS in [6] and [8]. Analysis of B1(T) and B2(T) has allowed to obtain the temperature dependences of the competing contributions BFe (T) and BRh (T) to the HFs on 111Cd probe nuclei in FeRh alloys.

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  • IPEN-DOC 22828

    FREIRE, LUCIANO O. ; ANDRADE, DELVONEI A. de . Technological perspectives for propulsion on nuclear attack submarines. World Journal of Nuclear Science and Technology, v. 6, p. 1-6, 2016. DOI: 10.4236/wjnst.2016.64028

    Abstract: This work aimed at proposing a new combination of technologies to improve military performances and reduce costs of nuclear attack submarines, without overlooking safety constraints. The last generation of nuclear attack submarines increased size to meet safety and operational requirements, imposing huge burden on costs side, reducing fleet size. The limitations of current Technologies employed were qualitatively discussed, explaining their limitations. There are new technologies (plate and shell heat exchangers) and architectural choices, like passive safety, and segregation of safety and normal systems, which may lead to reduction of costs and size of submarines. A qualitative analysis was provided on this combination of technologies, stressing their commercial nature and maturity, which reduced risks. The qualitative analysis showed the strong and weak points of this proposal, which adopted the concept of strength in numbers. Concluding, new Technologies enabled the existence of 3800 t nuclear attack submarines with powerful propulsion systems and good acoustic discretion.

    Palavras-Chave: propulsion; nuclear weapons; submarines; heat exchangers; pwr type reactors; comparative evaluations

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  • IPEN-DOC 23734

    TOMA, SERGIO H.; ALBERNAZ, MARTA de S.; BERNARDES, EMERSON S. ; SANTOS-OLIVEIRA, RALPH; ARAKI, KOITI. Targeted doubly labeled nanoparticles for tumor imaging. In: BRAZILIAN MEETING ON INORGANIC CHEMISTRY, 18th, September 25-30, 2016, São Pedro, SP. Abstract... 2016.

    Abstract: Diagnosing cancer tumors properly, with precision in the earliest as possible stages is fundamental to increase the success of the treatments and assure better and longer survival lifetime to the patients. In this direction the use of targeted nanoparticles, especially the ones decorated with monoclonal antibodies, has been the choice for the development of new more effective contrast agents, but the preparation method are generally cumbersome and inefficient. Described is in this report, 8 nm large SPIONs simultaneously conjugated with trastuzumabe and dtpa ligand. The antibody confers targeting properties while the chelating ligand the possibility of radiolabeling with 99mTc for SPECT imaging. Female Balb-c nude mice were xenografted with a breast cancer tumor model by subcutaneous injection of 2x106 MDA-MB-231 cells in the right flank and imaged with a gamma camera revealing high bioaccumulation of nanoparticles. No trombus and immune response leading to unwanted interaction and incorporation of nanoparticles by endothelium and organs, except by the kidneys, was observed in healthy mice. More than 80% of them is cleared by the renal pathway but the implanted tumor seems to increase the expression of HER2 receptors enhancing the uptake by all organs. However, even in this unfavorable situation the tumor concentrated much more radiolabeled SPIONs than the normal tissues giving a clear contrast, as expected for an efficient contrast agent for breast cancer imaging.

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  • IPEN-DOC 24645

    HAMBLIN, MICHAEL R.; SABINO, CAETANO P. . Systemic effects. In: SELLERA, FABIO P. (Ed.); NASCIMENTO, CRISTIANE L. (Ed.); RIBEIRO, MARTHA S. (Ed.). Photodynamic therapy in veterinary medicine: from basics to clinical practice. Gewerbestrasse, Switzerland: Springer, 2016. p. 73-91, DOI: 10.1007/978-3-319-45007-0_6

    Observação: Livro na íntegra disponível. Consulte a biblioteca do IPEN.

    Abstract: Photodynamic therapy (PDT) is a clinically approved practice for treatment of cancer and infectious diseases. PDT involves systemic or topical administration of a photosensitizer (PS), followed by irradiation of the target area with light of a wavelength matching the absorption band of the PS. In the presence of oxygen, photochemical reactions trigger the production of reactive oxygen species and, consequently, cell death by oxidative stress. Besides causing direct cytotoxicity to tumor cells, PDT induces destruction of the tumor vasculature releasing pro-inflammatory cytokines. Current literature supports that PDT is able to affect both the innate and adaptive responses of the immune system. In addition, PDT-induced adaptive immunity may attack distant untreated tumor cells and lead to development of antitumor memory immunity, which can potentially avoid the cancer relapse. Conversely, pro-inflammatory activity of PDT can also collaborate to resolve local infections since more neutrophils are recruited to the infected region.

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  • IPEN-DOC 23735

    FELINTO, M.C.F.C. ; DIAS, C.L.; NAKAMURA, L.K.O. ; BARBOSA, H.P.; RODRIGUES, L.C.; BRITO, H.F.; MALTA, O.M.L.; TEOTONIO, E.E.S.. Synthesis, characterization and spectroscopic properties of Nd2(MoO4)3 microflowers. In: BRAZILIAN MEETING ON INORGANIC CHEMISTRY, 18th, September 25-30, 2016, São Pedro, SP. Abstract... 2016.

    Abstract: Rare earth (RE) ion doped phosphors have attracted great interest during the past several decades due to their unique physical and chemical properties. RE ions can display many meaningful properties in optics, electronics, and magnetics, originating from f-f electronic transitions within the 4f shell. Among these RE ions, the Nd3+ ion is an important activator that can emit in the near infrared, corresponding to the transition, while located in a noncentrosymmetric site. Molybdates are important inorganic compounds and display some excellent performance in the field of lasers, phosphors and ionic conductors. Thus, many materials doped with Nd3+ can be used as infrared emitting phosphors and have potential application like diagnostic, biomarker, image, therapy, etc. Neodimium compound Nd2(MoO4)3 nanoparticles was prepared by co-precipitation route using a dispersor to control the particle shape and size. X-ray diffraction (XRD),scaning eletronic microscopy (SEM), transmission electron microscopy (TEM) and photoluminescence spectra (PL were applied to characterize the obtained samples. The XRD patterns reveal that as prepared sample is assigned to the scheelite-type tetragonal structure and this extructure change with the thermal treatment to a monoclinic phase. In addition, the as-synthesized Nd2(MoO4)3 particles are high purity well crystallized and with the crystalite size aproximately 21 nm. The possible formation process of Nd2(MoO4)3 nanoparticles have been discussed as well. Upon excitation by ultraviolet radiation, the as-synthesized Nd2(MoO4)3 nanoparticles exhibit the characteristic emission lines corresponding to Nd3+ ion spectra. It was observed the change in the structure with thermal treatment in the emission spectra. The luminescence spectra show the characteristic narrow bands assigned to 4f–4f transitions from the emitting 4 F3/2 level to the 4 I9/2 and, 4 I11/2 levels, centered around 915 and 1060 respectively.

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  • IPEN-DOC 23767

    LUGAO, A.B. ; GERALDES, A.N. ; LEAL, J.; VARCA, G.H.C. ; BATISTA, J.G.S.; GRASSELLI, M.; KATTI, K.; BARROS, J.. Synthesis of radioactive gold 198 nanoparticle encapsulated by albumin as cancer theranostics agent. In: CONGRESSO LATINO-AMERICANO DE ORGAOS ARTIFICIAIS E BIOMATERIAIS, 9; CONGRESSO DA SOCIEDADE LATINO AMERICANA DE BIOMATERIAIS, ORGAOS ARTIFICIAIS E ENGENHARIA DE TECIDOS, 13., 24-27 de agosto, 2016, Foz do Iguaçu, PR. Abstract... 2016.

    Abstract: Albumin is a natural drug nanocarrier as it has equivalent diameter of about 5 nm and has natural affinity for hydrophobic and hydrophilic drugs. They can be bound in a reversible way and the delivery controlled by endogenous mechanism. Albumin can be crosslinked by radiation alternatively to conventional systems, in such way that dialdehydes or toxic chemicals are avoided. On the theranostic side, radioactive ions are commonly employed for diagnostic and therapeutic applications. As an example, radioactive gold nanoparticles are currently employed in radiotherapy whether to increase local dose deposition in tissue during radiotherapy or as a local emitter of gamma and beta rays. The radioactive properties of gold include: 198Au (?max=0.96 MeV; t1/2 = 2.7 days) and 199Au (?max =0.46 MeV; t1/2 = 3.14 days), making it a strong candidate for theranostics . Conjugation of such materials with sugars, peptides, antibodies, proteins among others is routinely used nowadays for targeting. While radioactive nanoparticles can offer a much higher dose payload than ions for therapy and diagnostic, in addition to the the huge surface to bind targeting species presented by the nanoparticles, functionalization with proteins may potentially increases the particle uptake by tumors or tissues. The main purpose of this work was the development of one pot in situ synthesis of radioactive gold 198 nanoparticle encapsulated by albumin for application in cancer Theranostics. While crosslinked albumin may provide a nontoxic coating on AuNPs with a controllable hydrodynamic diameter, conventional AuNP can be activated by nuclear reactor to produce 198AuNP. The gamma or beta radiation originated from the gold nanoparticle was used to crosslink the Albumin layer. The use of a radioactive particle able to emit radiation for crosslinking of the Albumin layer and simultaneous theranostic application was tried for the first time. The elegant procedure and ease of produc¬tion combined with the properties of 198Au and the safety of HSA-198AuNP make this new particle an exciting advancement in cancer therapy and diagnosis. For such purpose, radioactive tetrachloroauric acid H198AuCl4 was produced from gold foils of high purity by neutron irradiation in IPEN research nuclear reactor. 198AuNP/BSA were synthesized by stirring aqueous solutions of BSA and radioactive tetrachloroauric acid H198AuCl4. The reaction mixtures were stirred continuously at 25 °C. The color of the mixture become purple-red from pale yellow within 15 minutes indicating the formation of gold nanoparticles. The reaction mixture was stirred for an additional 20 minutes. The 198AuNP/BSA formed were characterized by UV-Vis spectrophotometry, DLS and TEM analysis. The spectra were recorded at first day of preparation and after 1 month. Radioactive gold nanoparticle encapsulated by crosslinked Albumin was prepared in reproducible way. The gold nanoparticle core size measured by TEM was about 20 nm and about 60 to 70 nm with the albumin layer as measured by DLS. Bityrosine formation was measured by fluorescence and it was an evidence of intramolecular and intermolecular crosslinking. In conclusion the technique was suitable for the in situ production of the crosslinked albumin functionalized radioactive gold nanoparticles. Acknowledgements The authors would like to thank Conselho Nacional de Desenvolvimento Cientifico e Tecnológico (CNPq) project number 402887/2013-1 and 401438/2014-7 and International Atomic Energy Agency (IAEA) (CRP code F22064 ) for financial support.

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  • IPEN-DOC 22672

    ANTONIASSI, R.M. ; OTUBO, L. ; VAZ, J.M. ; OLIVEIRA NETO, A. ; SPINACE, E.V. . Synthesis of Pt nanoparticles with preferential (1 0 0) orientation directly on the carbon support for Direct Ethanol Fuel Cell. Journal of Catalysis, v. 342, p. 67-74, 2016. DOI: 10.1016/j.jcat.2016.07.022

    Abstract: The synthesis of Pt nanoparticles with preferential (100) orientation directly supported on carbon was done by an alcohol-reduction process using KBr as a shape directing agent. The synthesis conditions were varied and the obtained materials were characterized by transmission electron microscopy and cyclic voltammetry. The order of addition of the Pt precursor and KBr was crucial to obtain cubic Pt nanoparticles with small particle size highly dispersed on the carbon support. DEFC experiments showed that Pt nanoparticles with preferential (100) orientation supported on carbon provided superior power densities and CO2 selectivity compared to supported polycrystalline Pt nanoparticles.

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  • IPEN-DOC 22652

    VARCA, G.H.C. ; KADLUBOWSKI, S.; WOLSZCZAK, M.; LUGAO, A.B. ; ROSIAK, J.M.; ULANSKI, P.. Synthesis of papain nanoparticles by electron beam irradiation – A pathway for controlled enzyme crosslinking. International Journal of Biological Macromolecules, v. 92, p. 654-659, 2016. DOI: 10.1016/j.ijbiomac.2016.07.070

    Abstract: Crosslinked enzyme aggregates comprise more stable and highly concentrated enzymatic preparationsof current biotechnological and biomedical relevance. This work reports the development of crosslinkednanosized papain aggregates using electron beam irradiation as an alternative route for controlledenzyme crosslinking. The nanoparticles were synthesized in phosphate buffer using various ethanol con-centrations and electron beam irradiation doses. Particle size increase was monitored using dynamiclight scattering. The crosslinking formation by means of bityrosine linkages were measured by fluores-cence spectra and the enzymatic activity was monitored using Na-Benzoyl-dl-arginine p-nitroanilidehydrochloride as a substrate. The process led to crosslinked papain nanoparticles with controlled sizesranging from 6 to 11 nm depending upon the dose and ethanol concentration. The irradiation atmosphereplayed an important role in the final bioactivity of the nanoparticles, whereas argon and nitrous oxidesaturated systems were more effective than at atmospheric conditions in terms of preserving papain enzy-matic activity. Highlighted advantages of the technique include the lack of monomers and crosslinkingagents, quick processing with reduced bioactivity changes, and the possibility to be performed inside thefinal package simultaneously with sterilization.

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  • IPEN-DOC 23397

    TINTI, VICTOR B.; FONSECA, FABIO C. ; FLORIO, DANIEL Z. de. Synthesis of Ni nanoparticles in lanthanum chromite ceramic matrix. In: BRAZILIAN MRS MEETING, 15th, September 25-29, 2016, Campinas, SP. Abstract... São Carlos, SP: Aptor Software, 2016. p. 657-657.

    Abstract: Lanthanum chromite is a well-known interconnector for solid oxide fuel cells. It presents electronic conductivity at high temperatures. Moreover it is very stable in oxidizing and reducing atmospheres. Due to its high stability this material is a promising matrix to produce and stabilize nanoparticles by exothermal reaction. The objective of the present work is to synthesize and stabilize nickel nanoparticles in a stable ceramic matrix. Compounds of (La1-xSrx)a(Cr1-yNiy)O3 (x and y = 0, 0.1, and 0.2; a = 1, and 0.8) were synthesized by Pechini method. The powders were heat treated in air at 1300 °C and 1600°C in attempt to solubilize NiO in the matrix. Then the samples were exposed to a reducing treatment in H2(g) flux at 900°C per 8 hours. XRD measurements were made using a D8 Focus, Bruker AXS. The data was acquired in a range of 2θ from 20° to 90°, with a step of 0,02° per second. Magnetic properties were investigated utilizing a SQUIDVSM from Quantum Design. Magnetic moment at constant magnetic field (100 Oe and 1000 Oe) was measured in a range of 2K to 300K. Analyses with variable magnetic field were performed at 2K, 196K and 390K in a rage from -5 up to 5 T. Samples were observed using TEM technique. The XRD results showed that the stoichiometric samples achieved desiderate phase. Compounds without Sr and non-stoichiometric lanthanum site showed an incomplete nickel solid solution. The addition of 10% of Sr decreases the Néel temperature from 289 K to 285K. Ni doping created a stronger effect, lowering the temperature down to 267 K , in the sample with 10% of dopant. After reduction is possible to observe peaks of Ni in the XRD, indicating that nickel was exoluted form the matrix. Images of TEM confirm the presence of nanoparticles with an approximate diameter of 3 nm. The reducing treatment increased the magnetic response.

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  • IPEN-DOC 22447

    WONDRACEK, MARCOS H.P.; JORGETTO, ALEXANDRE O.; SILVA, ADRIELLI C.P.; IVASSECHEN, JANAINE do R.; SCHNEIDER, JOSE F.; SAEKI, MARGARIDA J.; PEDROSA, VALBER A.; YOSHITO, WALTER K. ; COLAUTO, FABIANO; ORTIZ, WILSON A.; CASTRO, GUSTAVO R.. Synthesis of mesoporous silica-coated magnetic nanoparticles modified with 4-amino-3-hydrazino-5-mercapto-1,2,4-triazole and its application as Cu(II) adsorbent from aqueous samples. Applied Surface Science, v. 367, p. 533-541, 2016.

    Palavras-Chave: synthesis; silica; nanoparticles; adsorbents; water; extraction; adsorption; composite materials; copper ions; scanning electron microscopy; transmission electron microscopy; fourier transform spectrometers; infrared spectra; nuclear magnetic resonance; surface area

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  • IPEN-DOC 23700

    MELLO-CASTANHO, SONIA ; SANTOS, SILAS C. ; CAMPOS, L.L. ; YAMAGATA, C. . Synthesis and processing of yttrium dysprosium-doped silicate. In: BRAZILIAN MEETING ON INORGANIC CHEMISTRY, 18th, September 25-30, 2016, São Pedro, SP. Abstract... 2016.

    Abstract: Sol gel route was used to synthetize Dy-doped Ytrium disilicate (Dy- Y2Si2O7) powders. The well-defined composition was a concern of the precision of the synthesis process, which stoichiometrically controlled to attain single crystalline phase and obtain fine particles in order to use as raw material for prototyping of bioinspired matrix from Luffa Cylindrica (LCy). The surface of the LCy was carefully prepared by chemical attack and the rheological studies of the aqueous suspensions performed with the synthetized Dy-doped Ytrium disilicate was previously studied. The optimized conditions were used to obtain porous and homogeneous replicas. The pieces biomorphic structure shaped were sintered at 1500 °C / 7h. The prototype was tested as a device for illumination from the burning of biomass in flame and showed good yield. The disilicate emission thermoluminescence doped with dysprosium demonstrated enhance the lumen capacity of this device.

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  • IPEN-DOC 22409

    MORAES, L.P.R.; MATOS, B.R. ; RADTKE, C.; SANTIAGO, E.I. ; FONSECA, F.C. ; AMICO, S.C.; MALFATTI, C.F.. Synthesis and performance of palladium-based electrocatalysis in alkaline direct ethanol fuel cell. International Journal of Hydrogen Energy, v. 41, n. 15, p. 6457-6468, 2016.

    Palavras-Chave: synthesis; performance; electrocatalysts; ethanol fuel; fuel cells; oxidation; electrocatalysts; supports; carbon; thermal gravimetric analysis; x-ray diffraction; transmission electron microscopy

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  • IPEN-DOC 23756

    PAZOS, ILEANA; AN, JUNG-CHUL; GRIMALD, NATASCIA; TAKINAMI, PATRICIA Y. ; POSTER, DIANNE; DISPENZA, CLELIA; DEL MASTRO, NELIDA ; VREELAND, WYATT; AL-SHEIKHLY, MOHAMAD. Synthesis and modification of functional polymer nanogels using pulsed-electron beam ionizing irradiation. In: MEETING OF THE IONIZING RADIATION AND POLYMERS SYMPOSIUM, 12th, September 25-30, 2016, Peninsula of Giens, France. Abstract... 2016. p. 55-55.

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  • IPEN-DOC 23804

    MITTANI, JUAN; GUGLIOTTI, CAROLINE ; MORIYA, KAREN; TATUMI, SONIA. Synthesis and luminescence studies of Mgo:Tb for use in radiation dosimetry. In: INTERNATIONAL CONFERENCE ON SOLID STATE DOSIMETRY, 18th, July 03-08, 2016, Munich, Germany. Abstract... 2016.

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  • IPEN-DOC 22650

    ZAVALA-LAGUNES, EDGAR; RUIZ, JUAN-CARLOS; VARCA, GUSTAVO H.C. ; BUCIO, EMILIO. Synthesis and characterization of stimuli-responsive polypropylene containing N-vinylcaprolactam and N-vinylimidazole obtained by ionizing radiation. Materials Science and Engineering C, v. 67, p. 353-361, 2016. DOI: 10.1016/j.msec.2016.05.044

    Abstract: Polypropylene films were grafted with thermo-responsive N-vinylcaprolactam and pH-responsive Nvinylimidazole polymers by means of gamma radiation using pre-irradiation and direct methods, in order to functionalize the films with thermo- and/or pH-responsiveness. The dependence of grafting yield on parameters such as co-monomer concentration, pre-irradiation dose, temperature, and reaction time was evaluated. The samples were characterized by Fourier transform infrared and X-ray photoelectron spectroscopies, differential scanning calorimetry, thermogravimetric analysis, swelling studies in different solvents, and water contact angle. The grafted copolymers presented thermo- and pH-sensitiveness, highlighting their potential as advanced biomaterials, capable of providing adequate environment for hosting and sustained release of antimicrobial drugs bearing cationic moieties, such as groups of diclofenac, while still exhibiting good cytocompatibility.

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  • IPEN-DOC 23587

    SILVA, F.R.O. ; YOSHITO, W.K. ; COSENTINO, I.C. ; BRESSIANI, A.H.A. ; LIMA, N.B. . Synthesis and characterization of new crystalline mesoporous beta-tricalcium phosphate nanoparticles. In: CONGRESSO BRASILEIRO DE ENGENHARIA E CIENCIA DOS MATERIAIS, 22., 06-10 de novembro, 2016, Natal, RN. Resumo... 2016. p. 1699.

    Abstract: Calcium phosphates, including hydroxyapatite [HA, Ca10 (PO4)6(OH)2] and beta-tricalcium phosphate [B-TCP, Ca3(PO4)2], are the main mineral component of bone tissue and teeth. The synthetic calcium phosphates are of special interest in medicine because of their biocompatibility, bioactivity and non-toxicity. B-TCP is advantageous to HA for drug delivery system due to their high solubility and controllable bioresorption rate. To obtain B-TCP, the literature reports the transformation of calcium deficient hydroxyapatite (CDHA) to ?-TCP since it couldnot be synthesized directly in aqueous solution, until now. For the first time, B-TCP have been successfully synthesized by wet precipitation method at room temperature with a Ca/P molar ratio equal to 1.5 and pH at 6. The present work is concerned with the preparation of B-TCP and it characterization through XRD, BET and TEM analysis. The results showed well-characterized peaks of crystalline pure B-TCP (JCPDS 09-0169) for the dried powder, with a high BET surface area of 574 ± 7 (m2/g). The TEM micrographs exhibits mesoporous structure, which is suitable as a drug carrier.

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  • IPEN-DOC 23726

    MONTEIRO, NATALIA K. ; SILVA, GABRIEL A.C. da ; FONSECA, FABIO C. . Synthesis and characterization of a doubleperovskite anode for solid oxide fuel cells. In: BRAZILIAN MRS MEETING, 15th, September 25-29, 2016, Campinas, SP. Abstract... 2016. p. 648-648.

    Abstract: Solid oxide fuel cells are one of the most efficient devices for the direct conversion of the chemical energy of a fuel into electricity. Nonetheless, standard solid oxide fuel cells (SOFC) with Ni/yttria-stabilized zirconia cermet anode have a serious decrease of their lifetime when fed with carbon-containing fuels due to coke formation. Ceramics with perovskite structure have been pointed out as good candidates to anodes. In this study, the Pr0.5Ba0.5MnO3 was used as the precursor phase of the double perovskite PrBaMn2O5+δ (PBMO), present at reducing conditions. The transport and catalytic properties were studied in the pristine compound and in Ru-doped samples Pr0.5Ba0.5Mn1-xRuxO3 (Ru-PBMO). Ru substitution at the B-site is expected to enhance the catalytic properties of the ceramic toward ethanol for SOFC’s running on such fuel. Simultaneous thermogravimetric and differential thermal analysis (TG/DTA) were used to monitor the thermal evolution of polymeric resins up to 1400 °C. Ceramic powders were characterized by X-ray diffraction (XRD), scanning electron microscopy (SEM) and transmission electron microscopy (TEM) analyses. The electrical properties of sintered samples were evaluated by dc 4-probe technique, in the 25 - 800 °C temperature range. The TG/DTA and XRD data show mass loss stabilization and crystalline phase formation occurring at ~800°C. The evolution of the XRD pattern upon calcining temperature indicated the formation of single phase of Ru-PBMO samples at ~1100°C. The initial results suggest that PBMO and PBMO-Ru compounds are promising SOFC anodes for carbon containing fuels.

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  • IPEN-DOC 21756

    JESUS, R.A.; RABELO, A.S.; FIGUEIREDO, R.T.; CIDES da SILVA, L.C.; COSENTINO, I.C. ; FANTINI, M.C.A. ; ARAUJO, G.L.B.; ARAUJO, A.A.S; MESQUITA, M.E.. Synthesis and application of the MCM-41 and SBA-15 as matrices for in vitro efavirenz release study. Journal of Drug Delivery Science and Technology, v. 31, p. 153-159, 2016.

    Palavras-Chave: synthesis; uses; drugs; aids virus; delivery; capsules; dissolution; in vitro; matrices; porous materials

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  • IPEN-DOC 22887

    ROSTELATO, M.E.C.M. ; SOUZA, C.D. ; ZEITUNI, C.A. ; MATTOS, F.R.; MARQUES, J.R.O. ; MOURA, J.A. ; FEHER, A. ; COSTA, O.L. ; SOUSA, D.C.B.; TIEZZI, R.; RODRIGUES, B.T.; KARAM JUNIOR, D. . Surface coating and study of metallic cores for radioactive sources production used in cancer treatment. In: INTERNATIONAL CONFERENCE ON SUSTAINABLE ENERGY, ENVIRONMENT AND INFORMATION ENGINEERING, March 20-21, 2016, Bangkok, Thailand. Proceedings... 2016. p. 438-441.

    Abstract: Developing new and innovative treatments for cancer is an urgent matter. The National Institute of Cancer estimates that Brazil will have 576,000 new cases of the disease in 2015. Our research group is developing new radioactive seeds to be use in radiotherapy procedures since the early 2000’s. We present the surface study and research for two of our major projects: iodine-125 seeds for prostate, brain and eye cancer treatment and iridium-192 for eyecancer treatment.

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  • IPEN-DOC 23393

    REIS, ADRIANO G. dos ; REIS, DANIELI A.P.; ABDALLA, ANTONIO J.; COUTO, ANTONIO A. ; SUGAHARA, TARCILA; OTUBO, JORGE. Surface characterization of plasma nitrided maraging 300 steel. In: BRAZILIAN MRS MEETING, 15th, September 25-29, 2016, Campinas, SP. Abstract... São Carlos, SP: Aptor Software, 2016. p. 865-865.

    Abstract: Maraging steels belong to a class of high strength steels with the combination of strength and toughness that are among the highest attainable in general engineering alloys. The term maraging is derived from martensite age hardening and denotes the age hardening of a low carbon, iron–nickel lath martensite matrix. These steels typically have very high nickel, cobalt and molybdenum and very low carbon content [1]. For aeronautical components requiring high strength and good wear resistance, such as, slat track, maraging steel possesses high strength, and good wear resistance can be achieved by plasma nitriding process, without sacrificing the strength of the bulk material [2]. In the present work, the surface of maraging 300 steel solution annealed and plasma nitrided was studied by atomic force microscopy (AFM) and microhardness. Samples were solution annealed at 820ºC for 1 h and then plasma nitrided by passing the gas mixture of H2 an N2 gases in the ratio of 3:1 under vacuum and it was carried out at 480ºC for 3 hours. 3D representation of nitrided and un-nitrided samples showed the nitrided samples with peak-valley structure, and the root mean square increase from 52 nm to 73 nm after superficial treatment. Plasma nitriding was effective to increase the microhardness from 331 HV to 1010 HV, and it is associated with the simultaneous aging and the iron nitrides formed.

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  • IPEN-DOC 22380

    CORDOBA JABONERO, CARMEN; LOPES, FABIO J.S. ; LANDULFO, EDUARDO ; OCHOA, HECTOR; GIL OJEDA, MANUEL. Subtropical and polar cirrus clouds characterized by ground-based lidars and CALIPSO/CALIOP observations. EPJ Web of Conferences, v. 119, p. 16012-1 - 16012-4, 2016.

    Palavras-Chave: clouds; optical radar; weather; optical properties; physical properties; detection

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  • IPEN-DOC 23333

    SCHELL, JULIANA; CORREIA, JOAO G.M.; DEICHER, MANFRED; LUPASCU, DORU C.; VIANDEN, REINER; BARBOSA, MARCELO; CARBONARI, ARTUR . Studying after effects by gamma-gamma and electron-gamma perturbed angular correlations. In: TEMST, KRISTIAAN (Ed.); VANTOMME, ANDRE (Ed.); COTTENIER, STEFAAN (Ed.); PEREIRA, LINO (Ed.) INTERNATIONAL CONFERENCE ON HYPERFINE INTERACTIONS AND THEIR APPLICATIONS, July 3-8, 2016, Leuven, Belgium. Abstract... Leuven, Belgium: Instituut voor Kern- en Stralingsfysica, 2016.

    Abstract: Using electron-gamma perturbed angular correlations (PAC) experiments working side-by-side with gamma-gamma PAC on the same isomeric transitions, besides structural properties, additional information can be unambiguously obtained by following the electronic recombination at the atomic shells and the neighbor atoms after the emission of the conversion electron from the probe nuclei K, L, or M atomic shells. Such experiments can be envisaged, as well, to clear out gamma-gamma PAC experiments where the probing state is fed by electron capture decay. There, one K, L, M orbital electron is absorbed by a proton creating a hole when the atomic number changes from Z to Z-1. This causes a severe electronic rearrangement of the atomic shells accompanied by the emission of x-rays and Auger electrons. The atom is left in a highly ionized state and the recombination time – fast or slow – depending on the availability and mobility of host electrons determines if a transient effect is observed within the lifetime of the nuclear state used for PAC. This is the so called “after effect”, that if properly understood, can further contribute to learn about the interaction of the impurity probe with the host, eventually observing ionized states and determining electron mobility [1]. Illustrating this problematic we present and discuss in this work the study of TiO2 doping [2] using different PAC isotopes (111In/111Cd, 181Hf/181Ta, 111mCd/111Cd, 117Cd/117In).

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  • IPEN-DOC 23806

    MUCSI, C.S. ; REIS, L.A.M.; ROSSI, J.L. . Study on the production of VAR electrodes from Zircaloy turning lathe chips. In: ENCONTRO CIENTÍFICO DE FÍSICA APLICADA, 7., 11-13 de maio, 2016, Serra, ES. Proceedings... São Paulo: Blucher Proceedings, 2016. p. 50-52.

    Abstract: Zircaloy 4 chips are produced in large quantities during the machining of Zircaloy 4 rods for the PWR fuel elements parts. Currently Zircaloy 4 is a zirconium alloy imported into Brazil and the machining chips scraps poses a challenge to the recycling industry. This paper presents the first step on the recycling processes and the results for the search of an efficient way on the cleaning, quality control and Vacuum Arc Remelting (VAR) electrode fabrication. The process starts with cutting oil washout and is followed by the die pressing of the clean chips. Process evaluation was first made by means the X-ray fluorescence tests in order to define the quality of the scraps. Results indicates the need of the inclusion of a magnetic separation step in the process to withdraw the ferrous alloy present in the scraps. The die pressing of the scraps yield process adequate 1 kg electrodes to be melted in the CCTM prototype scale VAR furnace. The authors also conclude that the samples obtained from the fuel element industry are secondary scraps and suggest them a procedure for the scrap stocking.

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  • IPEN-DOC 23641

    BETINI, E.G.; ROSSI, J.L. ; MUCSI, C.S. ; GOMES, M.P.; ORLANDO, M.T.; LUZ, T.S.. Study of the thermal diffusivity variation in thin duplex steel plates welded by GTAW process. In: CONGRESSO BRASILEIRO DE ENGENHARIA E CIENCIA DOS MATERIAIS, 22., 06-10 de novembro, 2016, Natal, RN. Abstract... 2016. p. 7614.

    Abstract: This study describes the experimental efforts in recording 2-dimensional temperature distribution in thin plates autogenous UNS S32304 steel during welding. The butt-welded autogenous joints were experimentally performed by the GTAW (Gas Tungsten Arc Welding) process with either argon or argon-2%nitrogen atmospheres. The increase of nitrogen mass in the heat affected regions after welding was measured suggesting a correlation with the change in the thermal diffusivity of the material. The laser flash method (LFM) was also used to determine the thermal diffusivity of the material in the thickness direction. The cooling rates of the temperature cycles were recorded by thermocouples embedded by spot welding on surfaces of the plate and connected to an acquisition multichannel data system. The temperature curves suggest a relationship between the microstructures in the solidified and the heat affected zone with the diffusivity variation. These measurements define key parameters regards the residual stress study after welded process.

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

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

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

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

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

Exemplo:

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

Autor: Maprelian

Título: loss of coolant

Tipo de publicação: Texto completo de evento

Ano de publicação: 2015

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

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

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.