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  • IPEN-DOC 25729

    GUILHEN, SABINE N. ; ROVANI, SUZIMARA ; PITOL FILHO, LUIZILDO; FUNGARO, DENISE A. . Kinetic study of uranium removal from aqueous solutions by macaúba biochar. Chemical Engineering Communications, v. 206, n. 11, p. 1365-1377, 2019. DOI: 10.1080/00986445.2018.1533467

    Abstract: Macaúba (Acronomia aculeata) is a palm tree native of the Brazilian savanna and a valuable renewable source of vegetable oil for human consumption and biodiesel production. In this study, the potentiality of the macaúba endocarp for biochar (BC) production was demonstrated. Moisture, density, elemental and molecular composition, along with TGA, FTIR, and XRD analyses were performed for the endocarp. Adsorption of uranyl ions, U(VI), from aqueous solutions was studied by batch technique using BC produced by slow pyrolysis of the endocarp at 350 °C (BC350). The effect of contact time on the removal of U(VI) by BC350 was evaluated. Linear and non-linear kinetics models were employed and the best fit for the experimental data was achieved for pseudo-first order non-linear model. The adsorption equilibrium was attained after 180 min of contact time and the equilibrium adsorption capacity achieved was of 400mg g-1. Finally, BC350 was characterized by SEM, FTIR, WDXRF, and XRD techniques.

    Palavras-Chave: kinetics; uranium; aqueous solutions; adsorption; trees; coconut palms; carbon; pyrolytic carbon


  • IPEN-DOC 25946

    YOUNG, N.C.; MOSCA, R.C. ; ZEITUNI, C.A. ; ARANY, P.R.. Smart dental fillings with ruthenium nanoparticles-enhanced photobiomodulation therapy for pulp-dentin regeneration. In: SOCIETY FOR BIOMATERIALS ANNUAL MEETING AND EXPOSITION, 42nd., April 3-6, 2019, Seattle, Washington, USA. Abstract... New Jersey, USA: Society For Biomaterials, 2019.


  • IPEN-DOC 25945

    LIMA, CASSIO ; CORREA, LUCIANA; BYRNE, HUGH; ZEZELL, DENISE M. . FTIR spectroscopy: a valuable tool to diagnose cutaneous tumors. In: NEXT FRONTIERS TO CURE CANCER, 10-12 de maio, 2018, São Paulo, SP. Abstract... São Paulo: A.C.Camargo Cancer Center, 2018.

    Abstract: Biological molecular bonds with an electric dipole moment that can change by atomic displacement due to natural vibrations are infrared active and therefore are quantitatively measured by Fourier transform Infrared Spectroscopy (FTIR), which is a rapid and label-free analytical tool that has been used to study the chemical interactions between biomolecules. The potential of FTIR spectroscopy as a diagnostic tool to discriminate cancerous from healthy tissue in a non-subjective manner has been well demonstrated. However, translation into clinical practice has been relatively slow, mainly due to the expensive and fragile infrared substrates required to perform the measurements. Thus, this study aims to demonstrate the ability of FTIR microspectroscopy to discriminate healthy skin from hyperplastic, papilloma and squamous cell carcinoma using standard H&E stained samples placed on glass slides. After approval of the ethics committee for research on animals (Comite de Etica no Uso de Animais, CEUA) of Instituto de Pesquisas Energéticas e Nucleares (IPEN) (project no. 164/15-CEUA-IPEN/SP), cutaneous neoplastic lesions were chemically-induced in the back of Swiss mice using a well- -stablished two-stage carcinogenesis protocol [1]. Healthy tissue was collected from animals non-exposed to chemicals and different diseased stages (hyperplastic epidermis, papillomatous lesions and squamous cell carcinoma (SCC)) were obtained by varying the exposure time of the animals to carcinogenenic factors.Tissue sections of 5 μm thickness were obtained from formalin-fixed paraffin-embedded (FFPE), hematoxylin & eosin stained and placed on glass slides. FTIR images were acquired in transmission mode over the spectral range 3000-3800 cm-1 with a pixel size of 6.25 × 6.25 μm at a spectral resolution of 4 cm-1. Spectral data were vector normalised and subjected to smoothing using Savitzky–Golay filtering with a polynomial of second order in an eleven point window. Principal components analysis (PCA) was applied and the PC scores were used as input data for linear discriminant analysis (PC-LDA) in a binary classification test. The groups were pairwise compared and the method was validated by leave-one-out cross-validation (LOOCV). All pre-processing and spectral analysis were performed on Matlab® R2017. Considering the sensitivity as the proportion of spectra collected from healthy tissue correctly identified in the healthy group and specificity as the proportion of spectra measured from neoplastic skin correctly associated to neoplastic group, the performance of classification obtained by PC-LDA was calculated for each pairwise comparison: Healthy × Hyperplastic, Healthy × Papilloma, Healthy × SCC, Hyperplastic × Papilloma, Hyperplastic × SCC, Papilloma × SCC. Sensitivity and specificity values over 90% were obtained for all groups compared, indicating that the information retained by bands peaking at 3000-3700 cm-1 in the infrared spectra — associated with the stretching vibrational modes of N-H, O-H and C-H chemical bonds on biological tissue — can discriminate normal and malignant tissue using H&E stained samples placed on glass slides. Thus, FTIR spectroscopy associated to PC-LDA as a binary classification test may be used as a complementary tool to help physicians to detect early stages of skin cancer, as well as to differentiate different types of cutaneous tumors.


  • IPEN-DOC 25944

    LIMA, CASSIO A. ; CORREA, LUCIANA; BYRNE, HUGH J.; ZEZELL, DENISE M. . Label-free Infrared spectroscopic imaging for characterization of necrotic tissue areas on cutaneous squamous cell carcinoma. In: MAHADEVAN-JANSEN, ANITA (Ed.); GRUNDFEST, WARREN S. (Ed.) SPIE PHOTONICS WEST; SPIE BIOS, February 2-7, 2019, San Francisco, USA. Proceedings... Washington, USA: SPIE, 2019. p. 1086812-1 - 1086812-6. (Proceedings SPIE 10868, Advanced Biomedical and Clinical Diagnostic and Surgical Guidance Systems XVII). DOI: 10.1117/12.2510711

    Abstract: In this study, FTIR spectroscopy was used to evaluate the overall biochemical status of necrotic tissue areas of cutaneous squamous cell carcinoma chemically-induced on mice. FTIR hyperspectral image collected from specimen showed high correlation with the photomicrograph obtained by light microscopy, in which we were able to identify clusters associated to keratin, necrosis and regions with no tissue. Alterations in the protein content were documented in the necrotic tissue areas, indicating changes on protein conformation.


  • IPEN-DOC 25943

    CONTATORI, CAROLINA G. de S. ; SILVA, CAMILA R. ; RIBEIRO, MARTHA S. . Effects of near-infrared low level laser irradiation on melanoma cells. In: COSTA-FELIX, RODRIGO (Ed.); MACHADO, JOÃO C. (Ed.); ALVARENGA, ANDRÉ V. (Ed.) BRAZILIAN CONGRESS ON BIOMEDICAL ENGINEERING, 26th, October 21-25, 2018, Armação de Buzios, RJ. Proceedings... Singapore: Springer Nature Singapore, 2019. p. 797-801. (IFMBE Proceedings, volume 70/2). DOI: 10.1007/978-981-13-2517-5_122

    Abstract: Low-level laser (LLL) therapy promotes biostimulating effects in cell cultures growing in nutritional deficit. However, the effects of LLLs on tumor cell lines remain controversial. Studies indicate stimulatory, inhibitory or even no influence in this type of cells. Therefore, the aim of this study was to evaluate the influence of LLL irradiation on the cell viability (with and without nutritional deficit) of human melanoma SKMEL 37 cells and murine melanoma B16F10 cells using an infrared laser (k = 780 nm) with different radiant exposures. The cell lines were subjected to the LLL 24 h after they were seeded in a 96-well plate at a density of 5 104 cells per well. The analysis of cell proliferation by mitochondrial activity occurred at intervals of 24 and 72 h after laser irradiation. At each time, culture medium was removed and 180 μL of PBS and 20 μL of MTT were added. The plates were incubated for 4 h and the absorbance was read in a microplate reader at 570 nm. Results showed a non-significant statistical difference among the groups for both cell lines regardless the nutritional medium. The metabolic pattern was similar among the groups. It is concluded that irradiation with 780 nm laser light at radiant exposures of 30, 90 and 150 J/cm2 and an output power of 40 mW does not promote cell proliferation on melanoma cell lines.

    Palavras-Chave: lasers; therapy; irradiation; laser radiation; melanomas; tumor cells; radiation doses


  • IPEN-DOC 25942

    FAROOQ, SAJID; CORREIA, THAMARA T. da S.; YOSHIMURA, TANIA M. ; PEREIRA, SAULO de T. ; RIBEIRO, MARTHA S. ; ARAUJO, RENATO E.. Methylene blue-mediated photoinactivation of Staphylococcus aureus assisted by gold nanoshells. In: COSTA-FELIX, RODRIGO (Ed.); MACHADO, JOÃO C. (Ed.); ALVARENGA, ANDRÉ V. (Ed.) BRAZILIAN CONGRESS ON BIOMEDICAL ENGINEERING, 26th, October 21-25, 2018, Armação de Buzios, RJ. Proceedings... Singapore: Springer Nature Singapore, 2019. p. 841-845. (IFMBE Proceedings, volume 70/2). DOI: 10.1007/978-981-13-2517-5_130

    Abstract: Gold nanoshells (silica core/gold shell) have fascinating optical extinction spectrum within visible to near infrared range. In this work, we investigate the optical properties of Au nanoshells and evaluate the feasibility of their use on photodynamic therapy. Three dimensional finite element simulation and experimental analyses were explored on the assessment of the localized surface plasmon resonance spectrum and spatial distribution of the electromagnetic field enhancement near metallic nanoshells. In addition, the interaction of Au nanoshells with methylene blue (MB) photosensitizer was appraised, and 3.2—fold metal enhanced single oxygen generation was observed. Lastly, we investigate the effects of MB-mediated photoinactivation on Staphylococcus aureus assisted by gold nanoshells. The use of nanoshells on the photoinactivation procedure reduced 3 the required illumination time for total eradication of bacterial cells. Our results indicate that Au nanoshells are promising candidates to enhance the photodynamic effect on bacterial cells.

    Palavras-Chave: methylene blue; nanomaterials; optical properties; staphylococcus; inactivation; shells; bacteria


  • IPEN-DOC 25941

    SANTANA, L.V. ; COTRIM, M.E.B. ; SISTI, C. ; SILVA, C.M.; SAID, D.S. ; PIRES, M.A.F. . Determination of the minimum sample mass of U3Si2 to be used as candidate reference material for chemical analyses of total uranium and total silicide. In: INTERNATIONAL SYMPOSIUM ON NATURALLY OCCURRING RADIOACTIVE MATERIAL, 8th, October 18-21, 2016, Rio de Janeiro, RJ. Proceedings... Vienna, Austria: IAEA, 2018. p. 356-360. (Proceedings Series IAEA).

    Abstract: To guarantee the reliability and comparability of analytical data, the use of reference materials is essential. Uranium intermetallic compounds, in particular U3Si2, have been the preferred fuel materials for high flux research reactors. A method for the quantitative determination of the minimum representative sample mass of a candidate for reference material for determination of total uranium and silicide is described and illustrated in this paper. The analytical method used for determination of total uranium was the high precision potentiometric titration method of Davies and Gray, while total silicide was determined gravimetrically. The study was conducted according to ISO Guide 35. A preliminary test for homogeneity can be performed after homogenization as an integral part of the candidate reference material preparation.


  • IPEN-DOC 25940

    ALMEIDA, H.C.; NASCIMENTO, T.B.S.; TADDEI, M.H.T.; MAZZILLI, B.P. . Comparison of 210Pb and 210Po activity concentrations for sediment dating. In: INTERNATIONAL SYMPOSIUM ON NATURALLY OCCURRING RADIOACTIVE MATERIAL, 8th, October 18-21, 2016, Rio de Janeiro, RJ. Proceedings... Vienna, Austria: IAEA, 2018. p. 213-217. (Proceedings Series IAEA).

    Abstract: Records stored in natural archives, such as those for lake sediments, are used in environmental programmes for the assessment of changing erosion rates in a catchment arising from disturbances, and to monitor pollution by heavy metals and other contaminants. Accurate sediment chronologies are important to interpret those practices. One of the most important methods for dating recent sediments is through 210Pb. This radionuclide occurs naturally as one of the 238U decay series. It is widely distributed on Earth owing to its decay from radium in the ground or from radon that emanates to the atmosphere. The 210Pb is deposited as particulates and falls into lakes where it is scavenged from the water column and deposited in the basins. The elevated 210Pb concentrations are measured using the gamma spectrometry technique. However, this technique has a low sensitivity and small values are difficult to detect or require a long measurement time. The determination of 210Po (a decay product of 210Pb) using alpha spectrometry is more sensitive and rapid. The aim of this paper is to compare the activity concentrations of the two radionuclides in lake sediment samples to evaluate the use of 210Po in the dating of sediments with low levels of 210Pb.


  • IPEN-DOC 25939

    ROSA, M.M.L. ; TADDEI, M.H.T.; CARRASCO, I.C.A.; CHEBERLE, L.T.V.; AVEGLIANO, R.P. ; MAIHARA, V.A. . Radionuclides of natural origin in food and water from a high background radiation area in south-eastern Brazil. In: INTERNATIONAL SYMPOSIUM ON NATURALLY OCCURRING RADIOACTIVE MATERIAL, 8th, October 18-21, 2016, Rio de Janeiro, RJ. Proceedings... Vienna, Austria: IAEA, 2018. p. 165-168. (Proceedings Series IAEA).

    Abstract: Food consumption is one of the main entry routes of radionuclides into the human body. Concentrations of radionuclides of natural origin vary according to several factors such as local geology, climate and agricultural practices. High background radiation areas have attracted much interest from a radiation protection point of view. The Poços de Caldas Plateau is located in south-eastern Brazil and is regarded as a high background radiation area. The situation of the resident population in the region of Poços de Caldas is of special interest for public health surveillance. The activity concentrations of radionuclides of natural origin in 19 groups of food and drinking water were determined. These radionuclides were quantified using gamma spectrometry, ultra low level alpha and beta total counting, and alpha spectrometry, after group preparation and/or radiochemical separations. The results of this study showed that the food groups analysed give rise to a low effective ingestion dose. Calculations were performed using the total radionuclide concentration in each food group, the mass consumed per day by each population group, the total time considered, and the dose intake of each radionuclide. The average annual effective dose received by members of the urban population on the Poços de Caldas plateau was 0.555 mSv.


  • IPEN-DOC 25938

    PECEQUILO, B.R.S. ; CAVALCANTE, F. ; BARROS, L.F. ; FERREIRA, A.O. ; FONSECA, L.M. ; MATEUS, C. . Self-attenuation factors in gamma-ray spectrometry of samples containing radionuclides of natural origin. In: INTERNATIONAL SYMPOSIUM ON NATURALLY OCCURRING RADIOACTIVE MATERIAL, 8th, October 18-21, 2016, Rio de Janeiro, RJ. Proceedings... Vienna, Austria: IAEA, 2018. p. 461-465. (Proceedings Series IAEA).

    Abstract: High resolution gamma-ray spectrometry is currently the most widely used analytical technique for qualitative and quantitative determination of radionuclides. Quantification of elements relies on the correct analysis of the spectra, depending strongly on the efficiency calibration of the measurement apparatus, most often performed with aqueous standard multi-radionuclide solutions. For efficiency calibration curves obtained by this method and for samples containing radionuclides of natural origin such as sand, soil, rocks and wall paint with apparent typical densities higher than that of water, self-attenuation correction factors were experimentally determined for hundreds of different samples using the Cutshall transmission technique. The results show that, to obtain more reliable analyses, correction factors for the self-attenuation behaviour, especially in the lower part of the energy spectrum, should be used. Since attenuation depends not only on the density of the sample but also on its chemical composition, correction factors have to be determined for each sample.


  • IPEN-DOC 25937

    FONSECA, L.M. . Concentrations of 226Ra, 232Th and 40K in Brazilian wall paint. In: INTERNATIONAL SYMPOSIUM ON NATURALLY OCCURRING RADIOACTIVE MATERIAL, 8th, October 18-21, 2016, Rio de Janeiro, RJ. Proceedings... Vienna, Austria: IAEA, 2018. p. 204-207. (Proceedings Series IAEA).

    Abstract: Geological materials used as building materials are a source of radiation exposure due to the presence of radionuclides of natural origin. Wall paint is one of the building materials to be considered for radiological evaluation as it generally contains titanium dioxide pigment obtained from minerals such as ilmenite and rutile which contain 238U and 232Th series radionuclides and 40K. In this work, radionuclide concentrations were determined in 50 commercial Brazilian white latex wall paints using high resolution gamma-ray spectrometry. The following activity concentrations were measured: 1.41–38.7 Bq/kg (226Ra), 0.9–101.2 Bq/kg (232Th) and 5.9–256 Bq/kg (40K). These results demonstrate that the wall paints studied in this work are safe for use.


  • IPEN-DOC 25936

    SILVA, A.R. ; DAMATTO, S.R. ; LEONARDO, L. ; GONÇALVES, P.N. ; SOUZA, J.M. ; MADUAR, M.F. . Radionuclides of natural origin in environmental samples collected in the catchment area of Ponte Nova reservoir, São Paulo, Brazil. In: INTERNATIONAL SYMPOSIUM ON NATURALLY OCCURRING RADIOACTIVE MATERIAL, 8th, October 18-21, 2016, Rio de Janeiro, RJ. Proceedings... Vienna, Austria: IAEA, 2018. p. 179-185. (Proceedings Series IAEA).

    Abstract: Natural radiation is generally classified as terrestrial primordial radiation or cosmogenic radiation. Primordial radiation is mostly due to the decay series of 238U and 232Th and is present in soil, sediments and water; another important source of natural radiation is 40K. Reservoirs are a very dynamic system with several phenomena to study, due to their huge impact on ecosystems and river flow. Ponte Nova reservoir (23°34'43.23"S, 45°56'56.76"W) is the first reservoir in a cascade system that was built in the 1970s to control the Upper Tietê River basin water flow. In the present work, the activity concentrations of 238U, 226Ra, 210Pb, 232Th, 228Th, 228Ra and 40K were determined using instrumental neutron activation analysis and gamma spectrometry in soil profiles collected in the catchment area of Ponte Nova Reservoir and sediment cores collected close to the soil samples. The highest concentration obtained in the soil samples was for 40K that varied from 49 to 2410 Bq/kg and 210Pb in the sediment samples, which varied from 20 to 774 Bq/kg. Cluster analysis and principal component analysis were applied to all the results obtained to verify a probable correlation between the radionuclides determined in the soil and sediment samples.


  • IPEN-DOC 25935

    MOREIRA, E.G. ; VASCONCELLOS, M.B.A. ; ROSA, M.M.L.; TADDEI, M.H.T.. Radionuclides of natural origin in a Brazilian mussel reference material. In: INTERNATIONAL SYMPOSIUM ON NATURALLY OCCURRING RADIOACTIVE MATERIAL, 8th, October 18-21, 2016, Rio de Janeiro, RJ. Proceedings... Vienna, Austria: IAEA, 2018. p. 169-172. (Proceedings Series IAEA).

    Abstract: Certified reference materials are important tools for the quality assurance of analytical results. However there are several constraints for their widespread use in developing countries such as lack of technological development or difficult access to imported goods. Another issue is that analyte level differences between imported certified reference materials and local laboratory samples may be a concern in the measurement process. This contribution presents the activity concentrations of 234U, 235U, 238U and 232Th determined by alpha spectrometry after a radiochemical separation procedure and 40K and 210Pb determined by gamma-ray spectrometry in a Perna perna mussel reference material produced in Brazil. The activity concentrations obtained were included as information values in the certification process of the reference material.


  • IPEN-DOC 25934

    ARAUJO, JOAO V. de S. ; BUGARIN, ALINE de F.S. ; DONATUS, UYIME ; MACHADO, CARULINE de S.C. ; QUEIROZ, FERNANDA M. ; TERADA, MAYSA ; ASTARITA, ANTONELLO; COSTA, ISOLDA . Thermomechanical treatment and corrosion resistance correlation in the AA2198 Al–Cu–Li alloy. Corrosion Engineering, Science and Technology, v. 54, n. 7, p. 575-586, 2019. DOI: 10.1080/1478422X.2019.1637077

    Abstract: The influence of T3, T8 and T851 thermomechanical treatments on the microstructure and corrosion resistance of the AA2198 was investigated. Differential scanning calorimetry and scanning electron microscopy were used for microstructural characterisation, whereas electrochemical methods were employed to analyse the corrosion behaviour of the alloy. The morphology and composition of constituent particles were similar for the T3 and T8 thermomechanical treatments but varied in the T851. There was an inverse relation between T1 phase density and corrosion resistance. The T3 treatment with the highest corrosion resistance was the one with the lowest density of T1 phase. The mechanisms of corrosion varied with the thermomechanical treatments.

    Palavras-Chave: thermomechanical treatments; aluminium alloys; lithium alloys; microstrutura; copper alloys; corrosion resistant alloys; heat treatments


  • IPEN-DOC 25933

    OLIVEIRA, PATRICIA da S.P. de ; ANDREA, VINICIUS ; SANTIAGO, ELISABETE I. ; LOPES, THIAGO ; ANDRADE, DELVONEI A. de ; LINARDI, MARCELO . A reliability-based strategy for the analysis of single proton exchange membrane fuel cells. Energy and Power Engineering, v. 11, n. 8, p. 303-319, 2019. DOI: 10.4236/epe.2019.118019

    Abstract: The development of power conversion systems based on fuel cells has been demanding reliability studies since the requirements associated with cost and durability of these technological products have become fundamental to their acceptance by the energy market. The experimental part of the reliability study presented in this work consisted of performing life tests with single proton exchange membrane fuel cells (PEMFCs). The proposed reliability analysis methodology covered the application of qualitative and quantitative techniques. In the qualitative approach, a Failure Mode and Effect Analysis was developed in order to identify and evaluate all potential failures associated with the operation of fuel cells. In the quantitative approach, a statistical analysis was applied to the sample data generated in long-term steady-state tests of these devices. A two-parameter exponential distribution was fitted to data and the maximum likelihood estimate for the mean time to failure (MTTF) of the fuel cells was calculated. It is important to point out that the tests performed under the scope of this study were the first long-term experiments performed with the fuel cells produced in the laboratories of IPEN-CNEN/SP, Brazil. Although the results indicated that fuel cell performance and durability were still at a level below the targets normally established for similar commercial devices, the improvement of the main components of PEMFCs has been the objective of several projects developed at the institute. Thus, the main benefit brought by this study is the proposed methodology, which can be implemented as part of a reliability growth analysis of the fuel cells and can be integrated into the design process of these devices.

    Palavras-Chave: fuel cells; reliability; durability; lifetime; energy; failures; hydrogen; brazilian cnen


  • IPEN-DOC 25932

    GONÇALVES, KARINA de O.; SILVA, FLAVIA R. de O. ; VIEIRA, DANIEL P. ; COURROL, LILIA C.. Synthesis of hybrid AuFe nanoparticles by photoreduction and methyl aminoluvinate. In: SBFOTON INTERNATIONAL OPTICS AND PHOTONICS CONFERENCE, October 08-10, 2018, Campinas, SP. Proceedings... Piscataway, NJ, USA: IEEE, 2018. DOI: 10.1109/SBFoton-IOPC.2018.8610950

    Abstract: The nanohybrid gold/iron (AuFe) system is particularly interesting for biomedical applications such as targeted drug delivery, hyperthermia and photodynamic therapy (PDT) mainly due to its magnetic combined to the plasmonic properties. In this study, we aimed to synthesize nanohybrids to be used as a vehicle to deliver Methyl Aminoluvinate (MAL) for selective and efficient PDT. MAL is a prodrug that is metabolized to protoporphyrin IX (PpIX), photosensitizer in PDT. The nanohybrids were synthesized by photoreduction of solutions containing iron powder, polyethylene glycol (PEG), chloroauric acid (HAuCl4) and MAL as a reducing agent in water solution. The products were characterized by UV-Vis, zeta potential and transmission electron microscopy. The synthesized nanoparticles had the optical properties of metallic nanoparticles and the magnetic properties of iron nanoparticles. Their characteristic absorption bands, in the visible light range, became become broader and red‐shifted in the presence of iron nanoparticles. Cell viability of cancer cell lines in the presence of nanohybrids studies were performed.


  • IPEN-DOC 25931

    SAITA, MARCELO T.; BARBOSA, EDUARDO A.; DEGASPERI, FRANCISCO T.; WETTER, NIKLAUS U. . Pressure measurement by low coherence speckle interferometry membrane shaping with tunable diode lasers. In: SBFOTON INTERNATIONAL OPTICS AND PHOTONICS CONFERENCE, October 08-10, 2018, Campinas, SP. Proceedings... Piscataway, NJ, USA: IEEE, 2018. DOI: 10.1109/SBFoton-IOPC.2018.8610915

    Abstract: Non-contact evaluation of object deformation is of great importance in several industrial and scientific processes. In this work the demonstrate that low-coherence digital speckle pattern interferometry can be employed for pressure measurement by the analysis of a 0.4-mm thickness, 55-mm diameter circular aluminum membrane submitted to a pressure differential ranging from 0 to 90 kPa. The membrane deformation was measured with a tunable red diode laser emitting simultaneously two wavelengths. The resulting speckle image of the membrane appeared covered with interference fringes which correspond to the contour lines of the studied surface. By means of conventional fringe pattern evaluation methods like 4-stepping and unwrapping methods the membrane deformation was determined. The experimental results were compared with the ones obtained by a numerical algorithm.


  • IPEN-DOC 25930

    SAMAD, RICARDO E. ; ZUFFI, ARMANDO V.F. ; MALDONADO, EDISON P.; VIEIRA JUNIOR, NILSON D. . Development and optical characterization of supersonic gas targets for high-intensity laser plasma studies. In: SBFOTON INTERNATIONAL OPTICS AND PHOTONICS CONFERENCE, October 08-10, 2018, Campinas, SP. Proceedings... Piscataway, NJ, USA: IEEE, 2018. DOI: 10.1109/SBFoton-IOPC.2018.8610903

    Abstract: Laser particle acceleration is a rapid growing field due to the compactness and smaller cost when compared to traditional accelerators, as well as the potential for new applications resulting from the unique characteristics of the beams generated. Frequently, laser acceleration techniques require laser intensities higher than 100's of PW/cm2 and highdensity gas targets, with specific profiles. In the effort to implement laser electron acceleration in our laboratories, we report the development of submillimetric, supersonic gas nozzles, the implementation of optical techniques for the determination of the gas jets density profiles, and the characterization of laser-induced plasmas obtained at laser intensities surpassing 1016 W/cm2. The characterization techniques employed include plasma spectroscopy, interferograms and Schlieren images.


  • IPEN-DOC 25929

    ZUFFI, ARMANDO V.F. ; ALMEIDA, ANDREIA A. ; VIEIRA JUNIOR, NILSON D. ; SAMAD, RICARDO E. . Characterization of below threshold harmonics generated in argon by ultrashort laser pulses. In: SBFOTON INTERNATIONAL OPTICS AND PHOTONICS CONFERENCE, October 08-10, 2018, Campinas, SP. Proceedings... Piscataway, NJ, USA: IEEE, 2018. DOI: 10.1109/SBFoton-IOPC.2018.8610890

    Abstract: This work reports studies on the generation of below threshold harmonics by ultrashort laser pulses in gas nozzles in vacuum. Odd harmonics of the laser, ranging from the 3rd up to the 9th, were generated in the UV and VUV regions, and the frequency conversion occurred in flowing gas. The harmonics were spectrally characterized, and the orders of the nonlinear processes were determined, showing that, for the higher order harmonics, competing processes decrease the energy coupling into the new frequencies. Also, the conversion efficiencies were estimated, showing that a few percent of the laser pulse energy are converted into the harmonics.


  • IPEN-DOC 25928

    LIMA, SAMIA R.M. ; FAUSTINO, MAINARA G. ; SANTOS, EDDY B. dos ; SILVA, TATIANE B.S.C. da ; PIRES, MARIA A.F. ; COTRIM, MARYCEL E.B. . Caracterização das frações de fósforo no sedimento superficial dos rios Aracaí, Carambeí e Guaçu na cidade de São Roque/SP. In: CONGRESSO BRASILEIRO DE GEOLOGIA DE ENGENHARIA E AMBIENTAL, 16., 2-6 de setembro, 2018, São Paulo, SP. Anais... São Paulo: ABGE, 2018. p. 1-10.

    Abstract: Neste trabalho foi realizado o fracionamento do fósforo nos sedimentos dos rios Aracaí, Carambeí e Guaçu da cidade de São Roque/SP. O método analítico utilizado foi o Protocolo desenvolvido pelo Standards, Measurements and Testing (SMT), que fracionou o fósforo nos sedimentos em total (PT), inorgânico (PI), orgânico (PO), não apatítico (PINA) e apatítico (PIA). Teve por objetivo avaliar a distribuição e fracionamento do fósforo nos sedimentos dos principais rios da região, a fim de verificar a contribuição do fósforo no processo de eutrofização, além dos demais impactos antrópicos que possam implicar na qualidade das águas dos rios do Município. Para tanto, foram avaliados 5 pontos amostrais, determinadas concentração de PT, PO, PI, PIA e PINA, juntamente com os parâmetros físico-químicos (granulometria, pH, e matéria orgânica). As maiores concentrações ocorreram nos sedimentos do ponto G4 com 456,9 para PT. Os teores de PI foram maiores que os de PO na maioria dos pontos. Os teores de sedimentos finos e de matéria orgânica foram os principais parâmetros ambientais correlacionados com as frações de fósforo. De acordo com a resolução CONAMA 344/04, as concentrações de fósforo encontradas estão abaixo do nível estabelecido.


  • IPEN-DOC 25927

    NASCIMENTO, S.F.; RIBEIRO, C.; FERREIRA, T.S. ; GUEDES-SILVA, C.C. . Reatividade in vitro de nitreto de silício contendo SiO2 e SrO. In: CONGRESSO BRASILEIRO DE ENGENHARIA E CIÊNCIA DOS MATERIAIS, 23., 04-08 de novembro, 2018, Foz do Iguaçu, PR. Resumo... 2018. p. 4-4.

    Abstract: Nesse trabalho, biocompósitos densos de nitreto de silício foram estudados visando sua utilização como componentes e dispositivos protéticos que requeiram boa interação com o tecido ósseo. Para tanto, cerâmicas de nitreto de silício em diferentes composições contendo SiO2 e SrO foram obtidas. Os aditivos foram selecionados para contribuir com a bioatividade e habilidade do material final em se ligar com o osso. Além disso, a liberação de estrôncio no paciente promove a proliferação de osteoblastos, aumentando o potencial do material para aplicações biomédicas. Dessa forma, o presente trabalho tem como objetivo avaliar o comportamento biológico in vitro de cerâmicas de nitreto de silício contendo SiO2 e SrO, por meio de testes de imersão em SBF (simulated body fluid). Os resultados mostraram que as composições estudadas conduziram à formação de depósitos contendo fósforo e cálcio superficial após 4 dias de imersão, demonstrando a capacidade dos materiais para aplicações na cirurgia maxilofacial, sistemas de miniosteofixação, espaçadores na fusão intervertebral e raízes dentais.


  • IPEN-DOC 25926

    FERREIRA, T.S. ; CARVALHO, F.M.S.; GUEDES-SILVA, C.C. . Avaliação das propriedades mecânicas e da resistência à oxidação de compósitos cerâmicos Si3N4-TiN. In: CONGRESSO BRASILEIRO DE ENGENHARIA E CIÊNCIA DOS MATERIAIS, 23., 04-08 de novembro, 2018, Foz do Iguaçu, PR. Resumo... 2018. p. 1254-1254.

    Abstract: Embora cerâmicas à base de Si3N4 já sejam utilizadas em diversas aplicações estruturais, vários compósitos de nitreto de silício têm sido estudados com o intuito de melhorar ainda mais suas propriedades mecânicas, principalmente a tenacidade à fratura. O presente trabalho visa avaliar as propriedades mecânicas e a resistência à oxidação de compósitos de Si3N4/TiN (até 30% em peso de TiN), contendo Al2O3 e Y2O3 (5% em peso de cada) como aditivos de sinterização. Amostras obtidas por prensagem uniaxial e isostática, sinterizadas a baixa pressão de nitrogênio a 1750ºC / 1 hora e 1815ºC / 1 hora, foram caracterizadas quanto à dureza e à tenacidade à fratura pelo método da impressão Vickers. O comportamento de oxidação foi avaliado por meio de tratamentos térmicos ao ar a 1400ºC por até 64 horas. Os resultados obtidos mostraram que as amostras atingiram valores de dureza entre 12,5 e 13,1 GPa, enquanto a tenacidade à fratura variou entre 6,3 e 9,3 MPa.m1/2, aumentando juntamente com a proporção de TiN no compósito cerâmico e superando os valores apresentados pelo nitreto de silício. Os testes de resistência à oxidação apresentaram valores de ganho de massa por área entre 0,7 e 6,4 mg/cm2, crescentes em função do teor de TiN presente no compósito e do tempo de exposição ao ar a 1400ºC.


  • IPEN-DOC 25925

    SALVETTI, TEREZA C. ; MARUMO, JULIO T. . Comparative study of the standards and guides of a management system applicable to radioactive waste. In: ANNUAL WASTE MANAGEMENT CONFERENCE, 44th, March 18-22, 2018, Phoenix, Arizona, USA. Proceedings... Arizona, USA: Waste Management Symposia, 2018. p. 1-9.

    Abstract: A Management System may be defined as a set of standardized and interrelated practices that aim to improve effectiveness and produce better results. This system should be structured in such a way as to allow essential information to flow properly within the organization, including technical, administrative, production and human resources information, among others, within an adopted compliance model. There are, currently, several standards and guidelines for structuring a compliance model related to a management system. A system that covers various aspects of management in a single system is usually called integrated. Only the International Atomic Energy Agency - IAEA has a guide with this approach for radioactive waste: GS-G-3.3, "The Management System for the Processing, Handling and Storage of Radioactive Waste" and GS-G-3.4, "The Management System for the Disposal of Radioactive Waste". The objective of this work is to present a comparison between existing standards, even if not specific for the management of radioactive waste, but which are widely used by companies. In due course, the result of this work will be object of proposal for specific standard to be presented to regulatory agency for this type of activity. This study should be useful for countries where there are no specific guidelines by the regulatory agency, adopting the best standard or guide as a conformity standards, creating and establishing a hybrid structure best suited to the safety and security aspects of the local culture.


  • IPEN-DOC 25924

    FILGUEIRA, D.A.; GARDA, G.M.; PUGLIESI, R. ; PEREIRA, M.A.S. ; SAYEG, I.J.. Caracterização da mineralização epigenética de cobre na região de Nova Prata do Iguaçu, Estado do Paraná, por microscopia eletrônica de varredura e tomografia de nêutrons. In: PALERMO, NELY (Ed.); ARAUJO JUNIOR, HERMINIO I. de (Ed.); MACHADO, FABIO B. (Ed.); CORVAL, ARTUR (Ed.); VALENTE, SERGIO de C. (Ed.); DAL'BÓ, PATRICK F. (Ed.) CONGRESSO BRASILEIRO DE GEOLOGIA, 49.; SIMPÓSIO DO CRETÁCEO DO BRASIL, 9.; SIMPÓSIO DE VULCANISMO E AMBIENTES ASSOCIADOS, 7., 20-24 de agosto, 2018, Rio de Janeiro, RJ. Resumo... São Paulo: Sociedade Brasileira de Geologia, 2018. p. 1706-1706.

    Abstract: Dentre os fatores que contribuem para a mineralização epigenética destacam-se a porosidade e a permeabilidade da rocha hospedeira da mineralização. Os fluidos mineralizantes transportam elementos que, dependendo das condições físico-químicas do meio, precipitam-se, podendo vir a formar depósitos minerais. Em Nova Prata do Iguaçu afloram níveis de rocha basáltica mineralizados em cobre, que se apresenta na forma nativa, como óxidos (tenorita, cuprita), como carbonato (malaquita) e silicato (crisocola). A presença de amígdalas, vesículas e geodos na rocha basáltica confere à mesma tanto a permeabilidade necessária para a percolação dos fluidos mineralizantes, como os espaços (vazios) para a precipitação de minerais de minério e minerais secundários associados ou não aos fluidos mineralizantes. Por espectroscopia de energia dispersiva de raios X acoplada à microscopia eletrônica de varredura (EDS/MEV) foram analisados minerais de minério e minerais secundários (analcima, variedades de quartzo, feldspato), dando-se atenção especial à crisocola, cuja variação de cores está relacionada às concentrações de cobre, alumínio e ferro nesse mineralóide. Assim, a crisocola laranja apresenta concentrações de cobre entre 30 e 36% e de alumínio + ferro de até 6%, ao passo que a crisocola azul apresenta concentrações de cobre entre 40 e 41,5% (e não contém alumínio ou ferro). Quanto aos carbonatos e óxidos de cobre, as concentrações de cobre nesses minerais variam entre 62-53% e 74-81%, respectivamente. A técnica da tomografia com nêutrons foi utilizada para investigar a distribuição dos minerais de cobre em amostras de basalto vesicular, empregando-se o equipamento do IPEN-CNEN/SP que está instalado no Reator Nuclear de Pesquisas IEA-R1. Além de não destrutiva, a técnica possibilitou a visualização das estruturas internas do basalto (vesículas preenchidas ou vazias) e a estimativa da proporção em volume de vazios, de cobre nativo e de crisocola. Foram tomografados três amostras de minério e as porcentagens obtidas para os vazios foram 26%, 29% e 31% e a de minerais de cobre 1,1%, 1,7% e 2,4%, respectivamente. O método também se mostrou eficiente no imageamento de cobre nativo. Apesar de não discriminar os silicatos e carbonatos secundários que também preenchem as vesículas do basalto, estes puderam ser identificados por microscopia óptica, difração de raios X e EDS/MEV nos laboratórios do IGc-USP. Assim, o uso da tomografia de nêutrons, associados a técnicas analíticas, como o EDS/MEV, em amostras provenientes de perfis de alteração hidrotermal/intempérico de sequências basálticas contribui para caracterização não só das estruturas da rocha, mas também dos níveis mineralizados e não mineralizados e no entendimento do processo mineralizante.


  • IPEN-DOC 25923

    LEAL, L.G.M. ; ZAMBONI, C.B. ; FROTA, L.O.O.; SIMON, M.S.L.; NASCINTO, R.M.. Caracterização multielementar do pólen da abelha Scaptotrigonaaff postica utlizando técnica de fluorescência de raios X. In: CONGRESSO BRASILEIRO DE APICULTURA, 22.; CONGRESSO BRASILEIRO DE MELIPONICULTURA, 7., 16-19 de maio, 2018, Joinville, SC. Resumo... 2018. p. 30-30.

    Abstract: Nos últimos anos a procura por produtos naturais e saudáveis cresceu significativamente e produtos oriundos da Meliponicultura (criação de abelhas sem ferrão), passaram a ser consumidos em maior escala no Brasil. Especificamente, o pólen tem ganhado destaque no âmbito nutricionalpor ser uma fonte proteica(16 a 40 %, contendo vários aminoácidos) e rica em carboidratos, lipídeos, oligoelementos minerais, fibras, hormônios e vitaminas. O pólen tem sido considerado um superalimento, mas investigação cientificas ainda são escassas, especialmente no que concerne estudos de suas propriedades especificas.O objetivo desta investigação foi avaliar o teor dos elementos inorgânicos (realização de análise multielemntar) em pólen de abelhas Scaptotrigonaaff. postica, proveniente da região de Barra do Corda, no estado do Maranhão. As analises foram realizadas utilizando espectrômetro de Fluorescência de Raios X (X-123SDD, Amptek) equipado com tubo de Raio de X de Prata e detector de Silício (Si Drift 25 mm2 x 500μm) com janela de Berílio de 0.5mil. Na análise multielementar Ca, Cl, Fe e K correspondem aos componentes majoritários enquanto P, S e Zn estão presentes como elementos traços. As concentrações obtidas encontram-se dentro dos limites máximos recomendados na legislação nacional. Essas estimativas compõem as primeiras avaliações de oligoelementos minerais deste produto natural e fornecem subsídio a apicultores à respeito de suas caraterística especificas além de contribuir com dados a relevantes no âmbito nutricional.


  • IPEN-DOC 25922

    GUEDES, ANDERSON G.; LANDULFO, EDUARDO ; HOELZEMANN, JUDITH; LOPES, FABIO J.S. ; SILVA, MARCOS P.A.; SANTOS, RENATA S.S.; GUERRERO-RASCADO, JUAN L.; ALADOS-ARBOLEDAS, LUCAS; DUARTE, EDICLE S.F.. Evaluation of the transport of atmospheric Sahara dust on Natal-RN through the LIDAR technique of depolarization. In: INTERNATIONAL WORKSHOP ON SAND/DUSTSTORMS AND ASSOCIATED DUSTFALL, 9th, May 22-24, 2018, Tenerife, Spain. Abstract... 2018. p. 249-249.

    Abstract: The objective of this work is describe some results of the Natal LIDAR system (DUSTER), an integrating station of The Latin America Lidar Network (LALINET), aimed to detect and evaluate the transcontinental transport of Sahara dust (SD) to the Brazilian territory during the aerosol MOnitoring campaign Long-­‐range Transportation OVer Natal I (MOLOTOV I) which occurred from December 2016 to February 2017. The city of Natal is located in northeastern Brazil and is one of the continental points closest to the African continent, a important fact to observe the entry of SD in the South American continent. The DUSTER system allows the detection of signals at wavelengths of 355 nm, 532 nm (parallel), 532 nm (perpendicular) and 1064 nm. To detect and characterize SD aerosols and other particles in the atmosphere, DUSTER uses the ability of suspended aerosol particles to change the polarization state of light. The data retrieved by DUSTER allow calculate fundamental parameters in the characterization of atmospheric aerosols such as linear volume depolarization ratio (𝛿!) and particle linear depolarization ratio (𝛿!). Campaign data showed that on a few days the value of 𝛿! varied between 0.09 and 0.33 at a transport altitude within the range of 1-­‐3.3 km above sea level indicating in some cases probably a mixture of SD with other types of aerosols such as marine particles, anthropogenic pollution or biomass burning smoke. The data obtained with DUSTER have allowed verify the seasonality of this transport, the altitudes of detected particles and study its optical properties.


  • IPEN-DOC 25921

    MAZIERO, J.S. ; CAVALCANTE, A.K. ; MARTINI, G.A. ; DAMASCENO, K.C. ; ORMENIO, M.B. ; CAVALCANTE, B.K. ; ROGERO, S.O. ; ROGERO, J.R. ; LUGAO, A.B. . In vitro and in vivo toxicity evaluation of silver nanoparticles stabilized with gum arabic. In: WORKSHOP ON ENVIRONMENTAL NANOTECHNOLOGY, 3rd, October 5-8, 2018, Sorocaba, SP. Abstract... 2018. p. 49-49.

    Abstract: Due to its properties such as size, varied shape, high surface area and high bactericidal properties, silver nanoparticles (AgNP) have been widely used in several sectors of the industry: bandages; inside food coolers, to retard spoilage; in antimicrobial insoles, to prevent odors; in air purifiers; in surgical instruments and etc [1] [2]. Considering the range of applications a great concern in the academic field, mainly ecotoxicological, as the potential impacts and risks that AgNP can cause to the environment and human health has increased. During the synthesis of AgNP it is necessary to use stabilizing agents such as gum arabic (GA), which is an exudate of dried gum, edible, from the stems and branches of Acacia senegal and A. seyal, rich in soluble fiber not viscous. GA has broad industrial use as stabilizer, thickening agent and emulsifier [3]. Based on these considerations, this work aimed to verify and compare the toxicity level of two GA-stabilized AgNP samples (Sample 1: AgNP at 147 ppm concentration, approximately 25 nm in size; and Sample 2: AgNP at concentration of 174 ppm with approximate size of 75 nm) using in vitro and in vivo assays. The in vitro cytotoxicity test was performed according to ISO 10993-5 by the neutral red uptake method in cells of the NCTC-L929 line, to obtain the IC50 (cytotoxicity index, which is the concentration of the substance causing it 50% mortality of exposed cells); and the in vivo acute ecotoxicity assay, according to the Brazilian standard ABNT NBR 12713, using Daphnia similis as the test organism to obtain EC50 (effective concentration that causes immobility in 50% of exposed organisms). The results obtained for Sample 1 were IC50 of 2.57 mg L-1 and EC50 of 4.40 μg L-1; and Sample 2: IC50 of 2.61 mg L-1 and EC50 of 6.55 μg L-1. These results demonstrated that aquatic organisms are much more sensitive to AgNP than cells in culture, raising the importance of conducting further studies related to the adversities that these nanoparticles can cause to the environment and human health. In addition, it is necessary to verify the disposal of the same in the environment, since in Brazil there are still no legislation that quantifies the permissible limits for this disposal.


  • IPEN-DOC 25920

    GIMILIANI, G.T. . An overview of nanoplastics present in the environment: a new group of nanomaterials?. In: WORKSHOP ON ENVIRONMENTAL NANOTECHNOLOGY, 3rd, October 5-8, 2018, Sorocaba, SP. Abstract... 2018. p. 47-47.

    Abstract: Plastic pollution is an internationally recognized problem and an understanding of the behavior of plastic particles in the environment is still under development [1]. In the environment, plastics degrade into microplastics, i.e. fragments and fibers, then fragmented to nanoplastics (NPs) eventually. These microplastic particles range between 1 mm to 5 mm [2], while the definition of NPs is still under debate; different studies have set the upper size limit from 1 nm to 1 mm [3]. Daily discharges of microplastics are estimated in the range of 50,000 up to 15 million particles, whereas no information on NPs discharges is available yet [4]. The present overview highlights the importance of NPs as a contributor to environmental pollution, which are considered emerging pollutants nowadays. NPs are homo- and/or heteroaggregates conformed with colloidal behavior [3]. The presence of these particles has been evidenced in the atmosphere [5], soil and marine environment, that represents an ultimate sink for contamination [6]. According to the International Standard Organization (ISO), a manufactured nanomaterial is intentionally produced for commercial purposes to have specific properties or specific composition, therefore, the NPs cannot be considered as such [3]. Moreover, release and impact on the environment of these particles is still not evident. Though several studies with engineered plastic nanomaterials showed toxicity and sub-lethal effects with consequences not only at organism and population level but on the overall ecosystem [6], are not representatives results [8]. However, current difficulties in sampling, identifying and characterizating nano-sized debris make it hard to assess their occurrence in the environment. Thus, NPs is a recent issue in the scientific community and deserves further attention to establish new remediation technologies.


  • IPEN-DOC 25919

    GIMILIANI, G.T. ; REDÍGOLO, M.M. ; FORNARI, M.; PARRA, D.F. ; LUGAO, A.B. ; ABESSA, D.M.S.; COTRIM, M.E.B. ; PIRES, M.A.F. . Micro- and nanoplastics in the sediments of the Santos Estuarine System, Brazil. In: WORKSHOP ON ENVIRONMENTAL NANOTECHNOLOGY, 3rd, October 5-8, 2018, Sorocaba, SP. Abstract... 2018. p. 46-46.

    Abstract: Small-scale plastic debris, such as microplastics and nanoplastics has become leading contributors to the pollution of marine and freshwater ecosystems [1]. These particles are derived from plastic degradation and produced intentionally for manufacturing products [2]. Microplastics are fragments and fibers smaller than 5 mm [3], while the definition of nanoplastics is still under debate; different studies have set the upper size limit at either 1000 nm or 100 nm [2]. The changes in the density of floating plastic debris caused by weathering process, biofilm formation and biofouling may result in sedimentation of these particles [3]. The present study investigates the presence of the micro- and nanoplastics in marine and estuarine sediments because these environments are suggested to be long-term sinks for microplastics. This study is the first investigative analysis about the presence of the micro- and nanoplastics on sediments of the Santos Estuarine System (SES), central coast of the São Paulo State, southeastern Brazil. Sediment samples from four sites distributed along in the Bugres River (23º56’49’’S – 46º22’57’’W), a small estuarine inlet located within the SES, were collected using a Van Veen grab sampler. In laboratory, the samples were then sieved with different mesh sizes (including < 63 μm), dried and evaluated for type of polymer by infrared spectroscopy (IR) and quantification of microplastics by visual sorting. IR analyses indicated that polyethylene and polypropylene were the main types of polymers found in fragments. Abundance of microplastics were likely inversely related to the mesh size of the sieve. Thus, the amount of microplastics increases as the size fractions decreases. Values ranged from 19 to 4,700 particles g-1 of sediment for 2 mm, 450 to 1,900.00 particles g-1 for 1 mm, 634 to 7,440 particles g-1 for 500 μm, 447 to 26,520 particles g-1 for 250 μm. The concentration of fibers ranged from 1.24 to 14.75 times higher compared to the concentration of fragments. In addition, the abundance of microplastics for 125, 63 and < 63 μm will be analyzed by thermogravimetric technique. Considering that the largest abundances of microplastics were found in the smallest meshes, it is expected the presence of nanoplastics in the sediment samples. The results of this study revealed relatively high concentrations of microplastics in sediments of the SES, confirming the widespread occurrence of microplastics in the Bugres River.


  • IPEN-DOC 25918

    JACOVONE, R.M.S. ; SOARES, J.J.S. ; SOUSA, T.S. ; RODRIGUES, D.F.; SILVA, F.R.O. ; GARCIA, R.H.L. ; VICENTE, E.J.; SAKATA, S.K. . Antibacterial activity of graphene oxide/silver nanocomposite synthesized by sustainable process. In: WORKSHOP ON ENVIRONMENTAL NANOTECHNOLOGY, 3rd, October 5-8, 2018, Sorocaba, SP. Abstract... 2018. p. 85-85.

    Abstract: Graphene oxide/silver nanocomposite has excellent antimicrobial properties [1]. The traditional methods of incorporation of metal in graphene oxide usually require toxic reagents or with long periods of reaction and in high temperature [2]. The objective of this study is to develop an innovative and sustainable method of incorporating silver into graphene oxide by electron beam. This methodology does not involve toxic reagents or residues and it is carried out in a short reaction time at room temperature. Dispersed graphene oxide was mixed with silver in the complex form in water- isopropanol solution. The mix was submitted to a dose of radiation varying between 150 and 400 KGy. The nanocomposite GO/Ag characterization was performed by thermogravimetry analysis (TGA), X-ray diffraction (XDR), scanning transmission electron microscope coupled to the energy dispersive X-ray spectrometry (TEM/EDS). The antibacterial activity of GO/Ag was observed against Gram negative, Escherichia coli by plate count method. The viable cells of GO and GO-Ag was determined by plating the inoculum after 4h of exposure to different concentrations of the nanomaterials (10, 50, 100, 200 and 500 μg/mL). The results showed that for 500 μg/mL of GO, inactivation cells were ca of 5,4 %, while for GOAg, the concentration to inactivate all cell were 5 times lower (100 μg/mL). The silver nanoparticles size range from 20 to 50 nm. This work showed that GO/Ag nanocomposites that were widely studied by their antibacterial properties can be produce by ionizing radiation. This is a sustainable method that does not require toxic reagents and does not generate hazardous wastes. The short reaction time of some minutes and the ambient temperature also make the process attractive.


  • IPEN-DOC 25917

    SANTOS, A. dos ; SOUZA, G.S. ; SANTOS, D.F. ; ANDRADE, D.A. . Subcritical boron experiments in the IPEN/MB-01 reactor. In: EUROPEAN RESEARCH REACTOR CONFERENCE, March 24-28, 2019, Jordan. Proceedings... Brussels, Belgium: European Nuclear Society, 2019.

    Abstract: Macroscopic (APSD and CPSD) and microscopic (Rossi-α) neutron noise experiments were performed in the IPEN/MB-01 reactor in order to measure subcritical reactivities. Subcritical states of up to around -6600 pcm were reached with insertion of boric acid (H3BO3) into the moderator tank. The subcritical kinetic model of Gandini and Salvatores was employed to infer the relative power between two consecutive subcritical cases, the subcritical reactivity (𝜌􀯚􀯘􀯡), and the subcriticality index (𝜁). This experimental methodology to measure these parameters was successfully employed in a previous experiment performed in the IPEN/MB-01 reactor. The measured subcritical reactivities are in good agreement for the APSD and Rossi-α cases. However, some drawbacks were found for the CPSD cases due to difficulties in the establishment of the cutoff frequency. The MCNP6.1 calculated subcritical reactivities were in a good agreement to APSD´s and Rossi-α measurement values. The ENDF/B-VII.0 nuclear data library was employed in all cases.


  • IPEN-DOC 25916

    CAVALCANTE, A.K. ; BATISTA, J.G.S. ; MAZIERO, J.S. ; DAMASCENO, K.C. ; ORMENIO, M.B. ; CAVALCANTE, B.K. ; ROGERO, S.O. ; ROGERO, J.R. ; LUGAO, A.B. . Evaluation of the toxicity of gold nanoparticles produced by green nanotechnology in Zebrafish (Danio rerio). In: WORKSHOP ON ENVIRONMENTAL NANOTECHNOLOGY, 3rd, October 5-8, 2018, Sorocaba, SP. Abstract... 2018. p. 28-28.

    Abstract: Gold nanoparticles (AuNPs) of different sizes and shapes have been extensively studied by researchers and laboratories around the world. Several studies have demonstrated the applicability of gold nanoparticles in the treatment and diagnosis of cancer, in the treatment of chronic inflammation, infections, degenerative diseases and autoimmune diseases [1]. The synthesis of AuNPs generally involves reducing agents which present problems related to toxicity. In order to address this issue, metabolites present in various plant extracts have been exploited for the preparation of different nanoparticles. The methods that use phytochemicals to reduce metal ions provide a green approach to nanotechnology, known as green nanotechnology [2]. Researchers have shown that some phytochemicals, such as mangiferin (MGF) and epigallocatechin-gallate (EGCG), in addition to reducing and stabilizing the gold nanoparticles, are able to functionalize them. These molecules have chemical groups that allow binding to overexpressed receptors on some types of tumor cells [3]. The objective of this study was to evaluate the level of toxicity of the gold nanoparticles, reduced and stabilized with epigallocatechin-gallate (EGCG-AuNPs) in Zebrafish embryos (Danio rerio), as an indication of a possible environmental effect. To assess the developmental impact of embryos, organisms were exposed to different dilutions of the EGCG-AuNPs suspension for a 96-hour period according to OECD Protocol 236 (Fish Embryo Acute Toxicity Test-FET). Zebrafish is an established vertebrate model for the study of development, disease and is being increasingly used for both pre-clinical studies and toxicological applications due to a range of favorable traits [4]. EGCG-AuNPs demonstrated toxicity, with organ lethality being less than 33% at all concentrations used. The work provided a contribution on the toxicity of AuNPs synthesized and stabilized with the epigallocatechin-gallate reducing agent and using Zebrafish embryos as an animal.


  • IPEN-DOC 25915

    SILVA, M.R.M. ; FIM, R.G.T. ; SILVA, S.C. ; CASINI, J.C.S.; WENDHAUSEN, P.A.P.; TAKIISHI, H. . Influence of alloying elements Zr, Nb and Mo on the microstructure and magnetic properties of sintered Pr-Fe-Co-B based permanent magnets. Materials Science Forum, v. 930, p. 440-444, 2018. DOI: 10.4028/

    Abstract: The addition of alloying elements on rare-earth permanent magnets is one of the methods used to improve the magnetic properties. This present work evaluates the influence of alloying elements such as Zr, Nb and Mo on the microstructure and magnetic properties of sintered Pr-FeCo- B based permanent magnets. The permanent magnets were produced by the conventional powder metallurgy route using powder obtained by hydrogen-decrepitation (HD) method from as cast alloys. In order to produce the magnet Pr16Fe66,9Co10,7B5,7Cu0,7 without alloying elements the mixture of alloys method was employed, mixing two compositions: Pr20Fe73B5Cu2 (33% w.t) and Pr14Fe64Co16B6 (67% w.t). With the purpose of evaluating the influence of the alloying elements, the Pr14Fe64Co16B6X0,1 (where X= Zr, Nb or Mo) (67% w.t) alloy was employed. The characterization of the alloys and the magnets was carried out using scanning electron microscopy (SEM), energy-dispersive X-ray spectroscopy (EDXS) and the magnetic properties were measured using a permeameter. The magnet without any additions presented the highest intrinsic coercivity (0iHc = 748 KA.m-1) while the magnet with Nb addition presented higher remanence (Br = 1,04 T). The magnet with Zr addition presented the highest maximum energy product (BHmáx = 144 KJ.m-3), and the magnet with Mo addition showed the highest squareness factor (SF = 0,73).


  • IPEN-DOC 25914

    FIM, R.G.T. ; SILVA, M.R.M. ; SILVA, S.C. ; CASINI, J.C.S.; WENDHAUSEN, P.A.P.; TAKIISHI, H. . Influence of milling time on magnetic properties and microstructure of sintered Nd-Fe-B based permanent magnets. Materials Science Forum, v. 930, p. 445-448, 2018. DOI: 10.4028/

    Abstract: In this paper, the effect of the grain size on sintered Nd-Fe-B based permanent magnets was investigated. In order, the magnets were produced by different milling times at 200 rpm and then vacuum sintered at 1373 K for 60 minutes followed by cooling outside the furnace. The magnets either produced by lower and higher milling times (30 and 75 minutes) exhibited lower remanence and coercivity, due the inhomogeneous distribution of the grain sizes. The magnet produced by intermediary milling time (45 minutes) exhibited the highest properties among all samples, with remanence of 1.06 T, coercivity of 891.3 KA.m-1, maximum energy product of 211 KJ.m3 and a squareness factor equal 0.92.


  • IPEN-DOC 25913

    STEFANI, GIOVANNI L. de ; MOREIRA, JOÃO M. de L.; MAIORINO, JOSE R.. Cálculos neutrônicos do núcleo do reator AP1000. In: SEMANA DE ENGENHARIA NUCLEAR E CIÊNCIAS DAS RADIAÇÕES, 4., 6-8 de novembro, 2018, Belo Horizonte, MG. Anais... Belo Horizonte: Escola de Engenharia, Universidade Federal de Minas Gerais, 2018. p. 634-642.

    Abstract: O presente trabalho trata da realização de cálculos de validação para modelagem de núcleo de um reator PWR utilizando o código SERPENT. O reator estudado em questão foi o AP1000, da Westinghouse. O estudo foi voltado ao primeiro ciclo do reator AP1000, de maneira a ser realizada uma comparação entre os valores reportados de k∞ para os elementos combustíveis em condição de potência zero frio com uma discrepância de 0,25%. Foram obtidos resultados compatíveis para cálculos de burnup referentes à curva do valor de concentração de boro, apesar do uso de distribuições uniformes de temperatura na modelagem. Além disso, também foram discutidos os efeitos de sombreamento entre os venenos queimáveis (IFBA e Pyrex) e barras de controle que são, juntamente com o boro solúvel, os meios de controle ao longo do primeiro ciclo. Notou-se que a presença de 9 barras de Pyrex em um elemento combustível diminuiu a reatividade média de uma barra de IFBA de 147 pcm para 33 pcm; e a presença de 28 barras de IFBA em um elemento combustível diminuiu a reatividade média de uma barra de Pyrex de 631 pcm para 277 pcm. O valor de reatividade de uma barra de controle negra reduz em cerca de 20% quando 28 barras de IFBA são inseridas no elemento combustível. Dessa forma os resultados mostram que esta versão do código SERPENT pode ser usada para projetar estudos de núcleos de reatores heterogêneos.


  • IPEN-DOC 25912

    CARVALHO, GLAUBER M. de ; SEMMLER, RENATO ; MENEZES, MARIO O. de . Repositório semântico de dados de análise por ativação neutrônica: uma proposta para eScience. In: SANTOS, ISRAEL F. dos (Org.); SAMPAIO, PAULO N.M. (Org.) WORKSHOP LATINO-AMERICANO DE TRABALHOS EM ANDAMENTO EM COMPUTAÇÃO, 1., 1-5 de outubro, 2018, São Paulo, SP. Anais... São Paulo: Sociedade Brasileira de Computação, 2018. p. 135-140.

    Abstract: Scientific Data Repositories are being made available each time more often, in a search for more transparency for scientific research and its results, making, in this way, possible to validate, reproduce and reuse the data in other studies. In this work, we present the ongoing research, part of a master dissertation, being developed at IPEN-CNEN/SP, seeking to build a semantic repository for Neutron Activation Analysis research data. The study began with the ontology construction and some of the preliminar results of this phase are presented.


  • IPEN-DOC 25911

    MORAIS, HENRIQUE M.; ROCHA, KAIO R.; TEIXEIRA, LETICIA dos S.; COSTA, MATHEUS F.; SAVOINE, MARCIA M. ; MENEZES, MARIO O. de . Caracterização de testbed em WSN e IoT na reserva indígena no norte do Tocantins. In: SANTOS, ISRAEL F. dos (Org.); SAMPAIO, PAULO N.M. (Org.) WORKSHOP LATINO-AMERICANO DE TRABALHOS EM ANDAMENTO EM COMPUTAÇÃO, 1., 1-5 de outubro, 2018, São Paulo, SP. Anais... São Paulo: Sociedade Brasileira de Computação, 2018. p. 11-16.

    Abstract: The use of a WSN with IoT devices in a critical scenario makes it relevant to perform tests to presume the behavior of the elements of a network in order to optimize its application. This work will present an experiment performed in the FIT IoT-Lab testbed platform, characterizing the Xambioá indigenous reservation, located in the northern region in the state of Tocantins, as an application scenario.


  • IPEN-DOC 25910

    CARVALHO, G.D.; SILVA, V.C.; HAFFNER, F.; SARTORI, C.A.F. ; LEBENSZTAJN, L.; KRAHENBUHL, L.. Modeling of a metamaterial in the FEA of a contactless transcutaneous energy transfer device. In: SIMPÓSIO BRASILEIRO DE MICRO-ONDAS E OPTOELETRÔNICA, 18.; CONGRESSO BRASILEIRO DE ELETROMAGNETISMO, 13., 12-15 de agosto, 2018, Santa Rita do Sapucaí, MG. Proceedings... 2018. p. 1-5.

    Abstract: Metamaterials are difficult to deal with in computational electromagnetic modelling, e.g. finite element analysis. The reason is the prohibitive discretization refinement needed to account for their actual electromagnetic field distribution profile, within the frequency range used in contactless energy transfer devices. We propose an approach to simplify the modeling of a metamaterial in finite element simulations and present an analysis of its impact in the evaluation of the magnetic field distribution in the vicinity of the metamaterial.


  • IPEN-DOC 25909

    ZAMBONI, C.B. ; SOUZA, G.O. ; ALVARENGA, A.M.; GIOVANNI, D.N.S. ; AZEVEDO, M.R.; KONSTANTYNER, T.. Detection of ions by XRF for use in the neonatal clinic. In: BRAZILIAN MEETING ON NUCLEAR PHYSICS, 41th, September 2-6, 2018, Maresias, SP. Abstract... São Paulo: Sociedade Brasileira de Física, 2018. p. 1-1.

    Abstract: In this investigation we intend to introduce bene¯ts to clinical practice in children, especially newborns and premature infants using an alternative procedure based on X-ray °uorescence technology (XRF). The establish- ment of alternative method, focusing on the use of small amounts of blood (a drop) for ions dosage, contributes with actions to humanize health care with minimal su®ering in the sense of adding another alternative for labo- ratory analysis in the pediatric practice. The dimension of this problem can be evaluated when a 3 kg newborn is considered to have between 280 mL and 300 mL of blood, while a preterm of 1 kg is in the range of 180 - 200 mL. As a result, blood collections for laboratory and functional tests in pediatric practice are the main causes of transfusions in infants, especially premature babies, depending on the dysfunction or treatment the child may need two to three collections per day. Based on these facts, the objective of this work is to analyze blood of newborns, concomitant with the traditional collection ("foot test"). The Ca, Cl, Fe and K dosage in blood samples of were determined using XRF technique. The blood samples came from the nursery of the Hospital of Itapecirica da Serra (S~ao Paulo city, Brazil). The X-Ray Fluorescence analysis was performed using X-Ray Spectrometer (X-123 SDD model - Amptek). The XRF analytical technique showed to be appropriate o®ering a new contribution to the neonatal clinic with actions to humanize health care, guaranteeing diagnostic accuracy with minimal su®ering and exposure to risks in the pediatric practice.


  • IPEN-DOC 25908

    SILVA, PAULO S.C. da ; ZAHN, GUILHERME S. ; CARVALHO, RICARDO N. de ; GENEZINI, FREDERICO A. . Gamma ray spectroscopy studies on low and intermediate level radioactive waste from Angra-1 nuclear power plant. In: BRAZILIAN MEETING ON NUCLEAR PHYSICS, 41th, September 2-6, 2018, Maresias, SP. Abstract... São Paulo: Sociedade Brasileira de Física, 2018. p. 1-1.

    Abstract: The determination of the radionuclide composition of low - and intermediate - level radioactive waste is of paramount importance for the design and implementation of Brazil`s planned radioactive waste repository. While there is some knowledge of the radionuclides expected to be present, the exact activity values in each of the waste bins are not determined with su±cient precision, so theres an ongoing e®ort to analyze the composition of this waste and make the radioactive inventory of the bins containt, which comprises several institutions and laboratories. In the present work the gamma - ray spectroscopy of samples of resin, ¯lters and evaporator concentrate from Angra 1 nuclear power plant have been studied. Small aliquots (» 500 mg) of the distinct samples were stored in glass vials and gamma- counted in a characterized high resolution germanium detector. In order to determine the best counting time, these aliquots were counted for 24h (real - time), with the spectroscopy results saved after each full hour of counting. The resulting twenty four spectra were then analyzed with Canberras Genie - 2000 software, using ISOCS e±ciency correction tool. The results for each sample were then compared to determine the required counting time for each of the radioisotopes of interest.


  • IPEN-DOC 25907

    LEÃO, ANICARINE R.; ZAMBONI, CIBELE B. ; SILVA, DALTON G.N. da ; MENDONÇA, RONALDO Z.; SIMONS, SIMONE M.. Alternative for the quality control of antivenom production proposed by Lonomia obliqua caterpillars using analytic techniques. In: BRAZILIAN MEETING ON NUCLEAR PHYSICS, 41th, September 2-6, 2018, Maresias, SP. Abstract... São Paulo: Sociedade Brasileira de Física, 2018. p. 1-1.

    Abstract: The caterpillars Lonomia obliqua Walker (L. obliqua) species, commonly found in southern Brazil, is very poisonous and can cause severe damage in human (haemorrhagic e®ects) after the contact that can lead to death [1]. The ¯rst case of poisoning (registered in Brazil) occurred in 1989 and the average number of accidents is closer to 500/year [2]. Nowadays, the Butantan Institute (Research Center at S~ao Paulo city, Brazil) is active in the production of this antiveneom in Latin America; it is the only producer of antilonomic serum. However, in the last two years, this caterpillar has been found in other regions due, mainly, to the expansion and destruction of natural ecosystems provide their growth in all regions of the country. To ensure that the antivenom produced (considering the di®erent origins) can be used for the manufacture of unaltered antilonomic serum, it is necessary to standardize this antidote. We intend to standardize the serum obtained from di®erent regions of origin using X-Ray Fluorescence (XRF). The experimental conditions using the compact XRF spectrometers (X-123SDD, Amptek) were optimized. The results will be compared and validated with INAA analysis.


  • IPEN-DOC 25906

    LEAL, LUIS G.M. ; ZAMBONI, C.B. ; MENDONÇA, RONALDO Z.; SIMONS, SIMONE M.; NASCIMENTO, ROBERTO M. do. Characterization of the extract of propolis produced by Scaptotrigona aff. Postiça bee from Brazil using NAA and XRF techniques. In: BRAZILIAN MEETING ON NUCLEAR PHYSICS, 41th, September 2-6, 2018, Maresias, SP. Abstract... São Paulo: Sociedade Brasileira de Física, 2018. p. 1-1.

    Abstract: The objective of this investigation was to perform a multielemental characterization of the extract of the propolis produced by Scaptotrigona a® Posti»ca Bee (\tubi") from Barra do Corda (MA-Brasil). The extract produced by this propolis have several medical applications: it is used in the healing of wounds with an in°ammatory process, in treatment of prostate tumors and, it has activity against herpes and rubella virus [1-3]. Two analytic techniques were applied for investigation: Neutron Activation Analysis (NAA) and X Ray Fluorescence (XRF). The neutron activation measurements were performed using the IEA-R1 nuclear reactor at IPEN - CNEN/SP and XRF data were obtained using a compact X- Ray spectrometer (X-123 SDD, Amptek) constituted by a Silicon detector coupled a mini X-ray tube (Ag). Direct analysis using EDXRF was compared with INAA procedure to evaluate the e®ect matrix and the results were satisfactory. These data increase the knowledge of the components and can introduce improvements in the production these extracts, mainly as regards to toxicity and nutritional composition.


  • IPEN-DOC 25905

    CAVALCANTI, H. de S. ; MIURA, VIVIANI M. ; ZAMBONI, CIBELE B. ; SILVA, DALTON G.N. da ; AZEVEDO, MARIA R.. The potassium reference value in blood in inhabitants of Brazil using EDXRF technique. In: BRAZILIAN MEETING ON NUCLEAR PHYSICS, 41th, September 2-6, 2018, Maresias, SP. Abstract... São Paulo: Sociedade Brasileira de Física, 2018. p. 1-1.

    Abstract: In this investigation, we intend to determine potassium levels in human blood aiming to study in more details the common de¯ciencies in Brazilian population helping their diagnostic well as to facilitate the interpretation of data deriving from clinical practice. The potassium takes part in the human being metabolism and it is very important for preservation of the osmotic and acid-base equilibria of human °uids, so its variations are generally associated to pathological processes. The objective of this study is the establishment of reliable potassium reference value in blood, using EDXRF technique, with emphasis on the statistical treatment. The samples came from Blood Banks from di®erent parts of Brazil. The biological samples were obtained from a select healthy group (male and female blood donors), following the procedure conventionally establish for blood donation. The in°uence of sex and age was evaluated considering several range for age (18-20, 21-30, 31-40, 41-50, 3 51 years). The result is presented following a descriptive statistics procedure, which includes the evaluation of mean, standard deviation, median and mode. This statistical treatment make possible the comparison with data derived for di®erent population groups. These results show small di®erences when a comparison is performed in function of age and sex emphasizing the necessity to adopt ranges.


  • IPEN-DOC 25904

    MEDEIROS, I.M.M.A. ; ZAMBONI, C.B. ; GIOVANNI, D.N.S. ; MEDEIROS, J.A.G.. Sodium analysis in sweeteners by neutron activation analyses technique. In: GUIMARÃES, VALDIR (Ed.); GENEZINI, FREDERICO (Ed.); LUBIAN, JESUS (Ed.); ASSUNÇÃO, MARLETE (Ed.); DELGADO, ADRIANA (Ed.); TREVISAN, LUIS A. (Ed.) BRAZILIAN MEETING ON NUCLEAR PHYSICS, 41th, September 2-6, 2018, Maresias, SP. Proceedings... Bristol, UK: IOP Publishing, 2019. p. 1-3. (Journal of Physics: Conf. Series 1291). DOI: 10.1088/1742-6596/1291/1/012021

    Abstract: Evaluation of Sodium in sweeteners is important in nutritional investigations and for consumers: excessive sodium consumption is one of the major risk factors, responsible for hypertension and cardiovascular diseases. In this study, twelve brands acquired in markets of São Paulo city were analysed by Instrumental Neutron Activation Analyses technique (INAA). The aim was to verify compliance with ANVISA recommendation in relation to sodium level. The results were compared with the amounts recommended and with the tolerable intake limit (< 0.4 g/kg). The sodium concentration in sweeteners samples showed low content for most of the brands. The results shown that for the general population, it is not risk.


  • IPEN-DOC 25903

    ZAHN, G.S. ; GENEZINI, F.A. ; RIBEIRO JUNIOR, I. . AnalisaCAEN, a simple software suite to reduce and analyze coincidence data collected using CAEN v1724 digitizer. In: GUIMARÃES, VALDIR (Ed.); GENEZINI, FREDERICO (Ed.); LUBIAN, JESUS (Ed.); ASSUNÇÃO, MARLETE (Ed.); DELGADO, ADRIANA (Ed.); TREVISAN, LUIS A. (Ed.) BRAZILIAN MEETING ON NUCLEAR PHYSICS, 41th, September 2-6, 2018, Maresias, SP. Proceedings... Bristol, UK: IOP Publishing, 2019. p. 1-3. (Journal of Physics: Conf. Series 1291). DOI: 10.1088/1742-6596/1291/1/012044

    Abstract: In this work a small software suite for the reduction and analysis of coincidence data collected using CAEN’s proprietary software was developed. These software check the output files for coincidences, generate a single list mode file with the coincident events, build histograms for each input, plus a time difference histogram and a 2-detector data matrix, perform time gates and allows for the subtraction of accidental coincidences, and perform energy gating on the final data matrices, generating histograms with the gated spectra. Moreover, the suite has an integrator that guides the user through all the required steps.


  • IPEN-DOC 25902

    ZAHN, G.S. ; GENEZINI, F.A. ; MORALLES, M. ; SIQUEIRA, P.T.D. ; MEDINA, N.H.; AGUIAR, V.A.P.; MACCHIONE, E.L.A.; ADDED, N.; SILVEIRA, M.A.G. da. A proposal to study long-lived isotopes produced by thermal neutron irradiation of digital devices. In: GUIMARÃES, VALDIR (Ed.); GENEZINI, FREDERICO (Ed.); LUBIAN, JESUS (Ed.); ASSUNÇÃO, MARLETE (Ed.); DELGADO, ADRIANA (Ed.); TREVISAN, LUIS A. (Ed.) BRAZILIAN MEETING ON NUCLEAR PHYSICS, 41th, September 2-6, 2018, Maresias, SP. Proceedings... Bristol, UK: IOP Publishing, 2019. p. 1-3. (Journal of Physics: Conf. Series 1291). DOI: 10.1088/1742-6596/1291/1/012020

    Abstract: In this work, we present a facility to study errors in digital devices exposed to thermal neutrons from a beam hole in the IEA-R1 nuclear reactor, as well as the long-lived isotopes produced in the irradiation of digital electronic devices under a slow neutron field. Preliminary results obtained with the analysis of a 28nm SRAM-based Xilinx Zynq-7000 FPGA are presented.


  • IPEN-DOC 25901

    MIURA, V.M. ; ZAMBONI, C.B. ; TASSO, O.G.; LEWGOY, H.R. ; JESUS, K.A.; SILVA, R.Y.R.. Investigation of ions in human whole saliva by analytic techniques. In: GUIMARÃES, VALDIR (Ed.); GENEZINI, FREDERICO (Ed.); LUBIAN, JESUS (Ed.); ASSUNÇÃO, MARLETE (Ed.); DELGADO, ADRIANA (Ed.); TREVISAN, LUIS A. (Ed.) BRAZILIAN MEETING ON NUCLEAR PHYSICS, 41th, September 2-6, 2018, Maresias, SP. Proceedings... Bristol, UK: IOP Publishing, 2019. p. 1-4. (Journal of Physics: Conf. Series 1291). DOI: 10.1088/1742-6596/1291/1/012026

    Abstract: In this study, ions of clinical relevance in non-stimulated human whole saliva obtained from healthy subject’s donors (adults and children) at São Paulo city (Brazil), were investigated. The Instrument Neutron Activation Analysis (INAA) and Energy Dispersive X-Ray Fluorescence (EDXRF) techniques were used. The comparison concentration between adults and children for Cl, K, Ca and Fe showed significant differences for all elements, emphasizing the need of adopting different reference values.


  • IPEN-DOC 25900

    GIOVANNI, D.N.S. ; ALMEIDA, M.R. ; ZAMBONI, C.B. ; METAIRON, S. ; BALDUINO, K.N. ; SUZUKI, M.F. ; BUENO JUNIOR, C.R.. Ions concentration in blood samples of SJL/J dystrophic mice strains using X-ray fluorescence spectrometry. In: GUIMARÃES, VALDIR (Ed.); GENEZINI, FREDERICO (Ed.); LUBIAN, JESUS (Ed.); ASSUNÇÃO, MARLETE (Ed.); DELGADO, ADRIANA (Ed.); TREVISAN, LUIS A. (Ed.) BRAZILIAN MEETING ON NUCLEAR PHYSICS, 41th, September 2-6, 2018, Maresias, SP. Proceedings... Bristol, UK: IOP Publishing, 2019. p. 1-4. (Journal of Physics: Conf. Series 1291). DOI: 10.1088/1742-6596/1291/1/012023

    Abstract: Star This study proposes an investigation of ions in whole blood of the dystrophic animal model SJL/J (mice strain with dysferlin protein deficiency) and in the control group (C57BL/6J) using the Energy Dispersive X-ray Fluorescence (EDXRF) spectrometry technique. The comparison between control and dystrophic mice results shown an increase in blood for P, S, K and Fe (p < 0.05) while a decrease in Ca (p < 0.05). This elemental analysis will contribute to evaluate the best diagnostic, care and treatment procedures, for the Progressive Muscular Dystrophy.


  • IPEN-DOC 25899

    ALMEIDA, M.R. ; ZAMBONI, C.B. ; GIOVANNI, D.N.S. ; AZEVEDO, M.R.A.. Sulfur status in judo athletes by XRF. In: GUIMARÃES, VALDIR (Ed.); GENEZINI, FREDERICO (Ed.); LUBIAN, JESUS (Ed.); ASSUNÇÃO, MARLETE (Ed.); DELGADO, ADRIANA (Ed.); TREVISAN, LUIS A. (Ed.) BRAZILIAN MEETING ON NUCLEAR PHYSICS, 41th, September 2-6, 2018, Maresias, SP. Proceedings... Bristol, UK: IOP Publishing, 2019. p. 1-4. (Journal of Physics: Conf. Series 1291). DOI: 10.1088/1742-6596/1291/1/012011

    Abstract: The human biomonitoring, measurement of chemical and/or their metabolites in human fluids, is an important tool for assessing the health condition of subjects, included athletes. In this study, sulfur levels were investigated in blood of judo athletes using Energy Dispersive X-ray Fluorescence (EDXRF) technique. Twenty athletes participated of this study. Two groups of athletes were selected: judo with a balanced diet with multivitamin/mineral supplements consumption and judo with diet not controlled. These data were compared with the control group (subjects of the same age but not involved with physical activities). There was a significant increase of S levels in athletes with diet not controlled. These data can be useful to a well-planned nutritional proposition that can contribute to better performance of athletes.


  • IPEN-DOC 25898

    GARCIA, VANESSA S.G. ; PEREIRA, MARIA C. ; ROSA, JORGE M. ; BORRELY, SUELI I. . Estudo sobre toxicidade do efluente e do consumo hídrico e energético no tingimento de poliamida. In: CONGRESSO NACIONAL DE MEIO AMBIENTE, 15., 25-28 de setembro, 2018, Poços de Caldas, MG. Resumo expandido... Poços de Caldas: GSC Eventos Especiais, 2018. p. 1-4.

    Abstract: O estudo concentrou-se na determinação do consumo hídrico e energético durante o tingimento da poliamida, bem como na avaliação do efeito tóxico do efluente para o microcurstáceo Daphnia similis. O processo de tingimento necessário para o tingimento de um quilograma de substrato consome energia suficiente para um banho de nove horas de duração utilizando-se um chuveiro convencional (4000 W). O efluente pode ser considerado como muito tóxico tendo em vista que a CE50 foi 0,61 ± 0,21 (%, v/v) após 48 horas de exposição. Conforme orientação da Resolução CONAMA 430/2011 o efluente deve ser tratado em nível tal que não induza toxicidade quando lançado no corpo receptor. Busca por tecnologias que permitam redução de toxicidade, reuso de efluentes e otimização de processos de tingimento, são de extrema necessidade dentro desta atividade industrial.


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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.


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, .

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).



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.