Navegação Periódicos - Artigos por assunto "magnetic fields"

Classificar por: Ordenar: Resultados:

  • IPEN-DOC 26393

    FERREIRA, EDUARDO G.A. ; MARUMO, JULIO T. ; FRANCO, MARGARETH K.K.D. ; YOKAICHIYA, FABIANO; VICENTE, ROBERTO . 10000 years cement: Can hydrated cement last as much as long-lived radionuclides?. Cement and Concrete Composites, v. 103, p. 339-352, 2019. DOI: 10.1016/j.cemconcomp.2019.05.016

    Abstract: This review is focused on the long-term performance of cementitious materials in a repository for radioactive waste. During the last few years, the disposal of disused sealed radioactive sources (DSRS) in a borehole type repository has been studied by many countries. The borehole concept is particularly useful to dispose of spent nuclear fuel and DSRS. In boreholes for DSRS, cementitious materials are intended to be used as structural material, immobilization matrix and as backfill. The understanding of the performance of these materials is essential to ensure the safety of the facilities during their required lifetime, from centuries to many thousands of years, depending on the initial activity and half-life of the waste. This review approaches the behavior of the cement from the hydration and hardening to the long-term processes that can affect its durability. Three main causes of failure of repository-engineered barriers are recognized: a) the formation of a preferential pathway for the migration of the contained radionuclides to the biosphere; b) loss of resistance and cohesion of the structural cementitious material; and c) the increase in the corrosion processes of the metallic components of the structures that affect the overall containment of the facility.

    Palavras-Chave: cement industry; portland cement; radioactive wastes; geologic formations; underground disposal; performance; chemical composition; mineralogy; radiations; magnetic fields; hydration

  • IPEN-DOC 24325

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

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

    Palavras-Chave: cerium 140; impurities; iear-1 reactor; magnetic fields; hyperfine structure; crystal field; intermetallic compounds

  • IPEN-DOC 21223

    SENA, C. ; COSTA, M.S. ; MUNOZ, E.L. ; CABRERA PASCA, G.A. ; PEREIRA, L.F.D. ; MESTNIK FILHO, J. ; CARBONARI, A.W. ; COAQUIRA, J.A.H.. Charge distribution and hyperfine interactions in the vicinity of impurity sites in Insub(2)Osub(3) doped with Fe, Co and Ni. Journal of Magnetism and Magnetic Materials, v. 387, p. 165-178, 2015.

    Palavras-Chave: hyperfine structure; indium oxides; density functional method; impurities; magnetic fields; calculation methods; doped materials; integral pac; spectroscopy; transition elements; iron; cobalt; nickel

  • IPEN-DOC 25855

    AGUIAR, D.J.M. de; PADILHA, A.F.; PLAUT, R.L.; SILVA, M.R. da; LIMA, N.B. de . Comparative study on the forming and reversion of strain-induced martensite in two duplex stainless steels: developing a model for VSM. Journal of Magnetism and Magnetic Materials, v. 485, p. 8-15, 2019. DOI: 10.1016/j.jmmm.2019.04.054

    Abstract: An original feature of this work is the proposal of two equations to fit the volume fraction of ferromagnetic (α+α′) phases that can be applied in the measurement of magnetic saturation of comminuted duplex and superduplex stainless steels (for example, powders or filed chips). Duplex stainless steels contain similar volume fractions of austenite (γ) and ferrite (α) in their microstructure. Two steels exemplify this class, namely the most widely used duplex UNS S31803 and superduplex UNS S32520 stainless steels. The phenomena of work hardening, formation, and reversion of strain-induced martensite (α′) in austenite were compared in both stainless steels. Samples were work-hardened and annealed under identical conditions, and their behavior was evaluated mainly through X-ray diffraction and magnetic measurements. Notably, the volume fraction of strain-induced α′ in duplex stainless steel was as high as 32%, which indicated that this steel had a greater tendency to form α′ than superduplex stainless steel, for which the corresponding value equaled 15%. Annealing at 650 °C for 2 h promoted the reversion of strain-induced α′ into γ, decreasing the volume fraction of the former phase from 32 to 2% (duplex) and from 15 to 6% (superduplex).

    Palavras-Chave: x-ray diffraction; stainless steels; martensite; chemical composition; ferromagnetism; magnetic fields; equations

  • IPEN-DOC 14907

    LIBRANTZ, ANDRE F.H. ; LIBRANTZ, HELIO. Efeitos da interferencia eletromagnetica em aeronaves causados por dispositivos eletronicos portateis (PEDs). Exacta, São Paulo, v. 4, n. 1, p. 55-63, 2006.

    Palavras-Chave: aircraft; magnetic fields; electronic equipment; interference

  • IPEN-DOC 19652

    BOSCH-SANTOS, B. ; CARBONARI, A.W. ; CABRERA PASCA, G.A.; COSTA, M.S.; SAXENA, R.N. . Effect of Ge substitution for Si on the magnetic hyperfine field in LaMnsub(2)Sisub(2) compound measured by perturbed angular correlation spectroscopy with sup(140)Ce as probe nuclei. Journal of Applied Physics, v. 113, p. 17E124-1 - 17E124-3, 2013.

    Palavras-Chave: germanium; silicon; lanthanum compounds; manganese compounds; silicon compounds; magnetic fields; hyperfine structure; perturbed angular correlation; cerium 140; probes; nuclei

  • IPEN-DOC 12258

    JURELO, A.R.; ANDRADE, S.; JARDIM, R.F.; FONSECA, F.C. ; TORIKACHVILI, M.S.; LACERDA, A.H.; BEN-DOR, L.. Effect of Ir substitution in the ferromagnetic superconductor RuSrsub(2)GdCusub(2)Osub(8). Physica C, v. 454, p. 30-37, 2007.

    Palavras-Chave: ; gadolinium compounds; iridium compounds; josephson junctions; magnetic fields; magnetic properties; oxygen compounds; polycrystals; ruthenium compounds; strontium compounds; superconductors; temperature dependence; temperature range 0000-0013 k; activation energy; copper compounds; critical field; ferromagnetic materials

  • IPEN-DOC 26868

    CORREA, E.L. ; BOSCH-SANTOS, B. ; SAXENA, R.N. ; CABRERA-PASCA, G.A.; CARBONARI, A.W. . Effects of an external magnetic field on the hyperfine parameters in RE2O3 (RE = Gd, Er) nanoparticles measured by perturbed angular correlation spectroscopy. AIP Advances, v. 10, n. 1, p. 015039-1 - 015039-6, 2020. DOI: 10.1063/1.5130401

    Abstract: In order to understand the interaction mechanisms in RE2O3 (RE=Gd, Er) nanoparticles (NPs), Perturbed Angular Correlation (PAC) spectroscopy, a local technique, plus external magnetic field, was used to elucidate local interactions and possible mapping of the different contribution in these compounds. NPs were synthesized by thermal decomposition and characterized by transmission electron microscopy and X-ray diffraction. PAC measurements were performed using 111In(111Cd) as probe nuclei, with and without the application of an external magnetic field (EMF) of 0.5 T in different temperatures (50 K, 100 K, 200 K, 300 K). Results show that the hyperfine magnetic field is almost zero when the probe is located at the symmetric site, and ∼4 T and ∼5 T for Gd2O3 and Er2O3, respectively, when the probe occupies the asymmetric field.

    Palavras-Chave: perturbed angular correlation; spectroscopy; magnetic fields; rare earths; hyperfine structure; asymmetry coefficients; thermal analysis; transmission electron microscopy; x-ray diffraction

  • IPEN-DOC 17884

    LEAL, ROBERTO; YAMAURA, MITIKO . Equilibrium adsorption isotherm of U(VI) at pH 4 and pH 5 onto synthetic magnetite nanoparticles. International Journal of Nuclear Energy Science and Technology, v. 6, n. 1, p. 1-7, 2011.

    Palavras-Chave: adsorption; adsorption isotherms; experimental data; iron ions; magnetic fields; magnetite; nanostructures; ph value; uranium; uranyl nitrates; waste water

  • IPEN-DOC 24245

    LI, Z.; TAVERNIER, F.; BREARD, A.; KRAHENBUHL, L.; VOYER, D.; SARTORI, C.A.F. . Error analysis for near-field EMC problems based on multipolar expansion approach. IEEE Transactions on Magnetics, v. 53, n. 6, 2017. DOI: 10.1109/TMAG.2017.2664985

    Abstract: Devices using power electronics are ubiquitous today and they are unfortunately intrinsic sources of electromagnetic interference. To address these electromagnetic compatibility problems at the initial design phase, a predictive method based on multipole expansion in spherical harmonics of the near field around each device was developed. To determine the basic expansions of a given source, a dedicated measurement bench has been designed. In this paper, some important issues of this approach and the measurement bench are studied, especially the error analysis on the measurements and the inverse problems. Some experimental results are also shown in the end.

    Palavras-Chave: spherical harmonics; electromagnetic fields; compatibility; power supplies; electronic circuits; magnetic fields

  • IPEN-DOC 27386

    RIGHI, HENRIETTE; ARRUDA-NETO, JOAO D.T.; GOMEZ, JOSE G.C.; SILVA, LUIZIANA F. da; SOMESSARI, ELIZABETH S.R. ; LEMOS, ALINE C.C.. Exposure of Deinococcus radiodurans to both static magnetic fields and gamma radiation: observation of cell recuperation effects. Journal of Biological Physics, v. 46, n. 3, p. 309-324, 2020. DOI: 10.1007/s10867-020-09554-5

    Abstract: The extremophilic bacterium Deinococcus radiodurans displays an extraordinary ability to withstand lethal radiation effects, due to its complex mechanisms for both proteome radiation protection and DNA repair. Published results obtained recently at this laboratory show that D. radiodurans submitted to ionizing radiation results in its DNA being shattered into small fragments which, when exposed to a “static electric field’ (SEF), greatly decreases cell viability. These findings motivated the performing of D. radiodurans exposed to gamma radiation, yet exposed to a different exogenous physical agent, “static magnetic fields” (SMF). Cells of D. radiodurans [strain D.r. GY 9613 (R1)] in the exponential phase were submitted to 60Co gamma radiation from a gamma cell. Samples were exposed to doses in the interval 0.5–12.5 kGy, while the control samples were kept next to the irradiation setup. Exposures to SMF were carried out with intensities of 0.08 T and 0.8 T delivered by two settings: (a) a device built up at this laboratory with niobium magnets, delivering 0.08 T, and (b) an electromagnet (Walker Scientific) generating static magnetic fields with intensities from 0.1 to 0.8 T. All samples were placed in a bacteriological incubator at 30 °C for 48 h, and after incubation, a counting of colony forming units was performed. Two sets of cell surviving data were measured, each in triplicate, obtained in independent experiments. A remarkable similarity between the two data sets is revealed, underscoring reproducibility within the 5% range. Appraisal of raw data shows that exposure of irradiated cells to SMF substantially increases their viability. Data interpretation strongly suggests that the increase of D. radiodurans cell viability is a sole magnetic physical effect, driven by a stochastic process, improving the efficiency of the rejoining of DNA fragments, thus increasing cell viability. A type of cut-off dose is identified at 10 kGy, above which the irradiated cellular system loses recovery and the cell survival mechanism collapses.

    Palavras-Chave: gamma radiation; micrococcus radiodurans; bacteria; ionizing radiations; survival curves; magnetic fields; dna

  • IPEN-DOC 26871

    TINTI, VICTOR B.; MARANI, DEBORA; FERLAUTO, ANDRE S; FONSECA, FABIO C. ; ESPOSITO, VINCENZO; FLORIO, DANIEL Z. de. Exsolution of nickel nanoparticles from mixed-valence metal oxides: a quantitative evaluation by magnetic measurements. Particle and Particle Systems Characterization, v. 37, n. 2, p. 1900472-1 - 1900472-7, 2020. DOI: 10.1002/ppsc.201900472

    Abstract: A fast and accurate experimental method is demonstrated to assess the fraction of exsolved metallic nanoparticles using magnetic measurements. As a benchmark, nanometric metallic nickel exsolved from (La1−xSrx)(Cr1−yNiy) O3−δ is used for its high relevance as a solid oxide fuel cell component. The method is based on the difference in the magnetic response of the exsolved metallic nickel (ferromagnetic) and Sr-doped lanthanum chromite ceramic matrix (paramagnetic). The exsolved nickel results in coherent nanoparticles pinned on the surface of the Sr-doped lanthanum chromite ceramic matrix, as evidenced by electron microscopy analyses. The results obtained indicate the procedure as a fast and sensitive method to study the exsolution of ferromagnetic nanoparticles.

    Palavras-Chave: nanoparticles; nickel; magnetic fields; magnetometers; valence; evaluation; ferromagnetic materials

  • IPEN-DOC 26919

    EGGERT, B.G.F.; TEIXEIRA, C.S.; LOPES, L.U. ; WENDHAUSEN, P.A.P.. Feasibility of Nd substitution in (La, Nd)(Fe, Si)13 magnetocaloric compound obtained by the reduction-diffusion process. IEEE Transactions on Magnetics, v. 52, n. 5, 2016. DOI: 10.1109/TMAG.2015.2512502

    Abstract: Quaternary magnetocaloric compound La1−xNdxFe11.3Si1.7 was synthesized via the so-called reduction–diffusion (RD) process. The RD process was carried out at 1423 K, using Ca as the reducing agent and La and Nd oxides as the precursors to form, together with iron and silicon powder, the desired cubic NaZn13-type structure. The main purpose was to study the interchange of La and Nd in terms of process yield, crystal structure parameters and typical magnetic transition temperature [Curie temperature (Tc)] associated with the magnetocaloric effect. Microstructural characterization by scanning electron microscopy associated with microprobe energy dispersive spectroscopy and backscattered electron imaging was used to identify morphology and particle size of reaction products, as well as the extent of diffusion reactions. Structural characterization results obtained by X-ray diffraction technique associated with Rietveld refinements show the possibility to obtain almost single-phase La1−xNdxFe11.3Si1.7, for which x was varied from 0 to 0.5, with reminiscent α-iron phase below 10 wt%. Moreover, the Tc of all obtained alloys were inferred from differential scanning calorimetry curves, showing that Nd is an effective alloying element to tune the working temperature in the near-room-temperature magnetic refrigeration.

    Palavras-Chave: neodymium compounds; feasibility studies; intermetallic compounds; magnetic properties; reduction; microstructure; x-ray diffraction; magnetic fields; regenerators; magnetic properties

  • IPEN-DOC 27153

    CORRÊA, BRUNO S.; COSTA, MESSIAS S. ; CABRERA-PASCA, GABRIEL A. ; SENA, CLEIDILANE ; PINTO, RAFAEL H.H.; SILVA, ANA P.S.; CARVALHO JUNIOR, RAUL N.; ISHIDA, LINA; RAMON, JONATHAN G.A.; FREITAS, RAFAEL S.; SAIKI, MITIKO ; MATOS, IZABELA T. ; CORRÊA, EDUARDO L. ; CARBONARI, ARTUR W. . High-saturation magnetization in small nanoparticles of Fe3O4 coated with natural oils. Journal of Nanoparticle Research, v. 22, n. 3, p. 1-15, 2020. DOI: 10.1007/s11051-020-4761-5

    Abstract: The enhancement of nanoparticle’s magnetic properties with a suitable coating is the main tool to increase their potential as an effective candidate for applications in different areas, especially in biomedicine. In the work here reported, Fe3O4 nanoparticles coated with natural oils were synthesized by iron (III) acetylacetonate thermal decomposition and the effects of the coating on the magnetic properties of these particles have been investigated. The oils were extracted from three Amazon fruits seeds: açaí, ucuúba, and bacaba by CO2 supercritical extraction process, and the relative percentage composition of fatty acids were determined by gas chromatography. A systematic study of crystalline, morphological, and magnetic properties revealed a saturation magnetization (Ms) enhancement and high values of the anisotropy constant for Fe3O4 samples when coated with açaí and ucuúba oils, which present a large percentage of saturated total fatty acid. Our results indicate that nanoparticles with sizes smaller than around 5 nm present Ms values as high as that found for bulk Fe3O4 and, consequently, much higher than Ms values for nanoparticles usually coated with oleic acid. The nuclear techniques neutron activation analysis and perturbed angular correlations were used to better characterize the nanoparticles.

    Palavras-Chave: magnetization; nanoparticles; iron oxides; magnetic properties; anisotropy; synthesis; magnetic fields; hyperfine structure; seeds; amazon river; carbon dioxide; vegetable oils; therapy; medicinal plants

  • IPEN-DOC 20793

    DOMIENIKAN, C. ; BOSCH-SANTOS, B. ; CABRERA PASCA, G.A. ; SAXENA, R.N. ; CARBONARI, A.W. . Hyperfine field at Mn in the intermetallic compound LaMnSisub(2) measured by PAC using sup(111)Cd nuclear probe. Hyperfine Interactions, v. 231, p. 95-99, 2015.

    Palavras-Chave: intermetallic compounds; hyperfine structure; magnetic fields; manganese; perturbed angular correlation

  • IPEN-DOC 13717

    CARBONARI, A.W. ; LAPOLLI, A.L. ; SAXENA, R.N. ; MESTNIK FILHO, J. . Hyperfine interactions at R and In sites in RNiIn (R=Gd, Tb, Dy, Ho) compounds measured by perturbed angular correlation spectroscopy. Hyperfine Interactions, v. 176, n. 1-3, p. 101-106, 2007. DOI: 10.1007/978-3-540-85320-6_16

    Palavras-Chave: rare earth compounds; perturbed angular correlation; ferromagnetism; magnetic fields

  • IPEN-DOC 09205

    CARBONARI, A.W. ; MESTNIK FILHO, J. ; SAXENA, R.N. ; DOGRA, R.; COAQUIRA, J.A.H.. Hyperfine interactions in CeTsub(2)Gesub(2)(T=Mn,Co) heavy fermions compounds measured by TDPAC. Hyperfine Interactions, v. 136/137, n. 3/8, p. 345-349, 2001.

    Palavras-Chave: intermetallic compounds; fermions; cerium alloys; manganese alloys; cobalt alloys; germanium alloys; differential pac; magnetic fields; cadmium 111; cerium 140; magnetism; electric fields

  • IPEN-DOC 11175

    CABRERA PASCA, G.A.; RAO, M.N.; OLIVEIRA, J.R.B.; RIZZUTTO, M.A.; ADDED, N.; SEALE, W.A.; RIBAS, R.V.; MEDINA, N.H.; SAXENA, R.N. ; CARBONARI, A.W. . Implantation of sup(111)In - probe nuclei with nuclear reactions sup(108)Pd(sup(6,7)Li,xn)sup(111)In using pelletron tandem accelerator: study of local magnetism in Heusler alloys. Hyperfine Interactions, v. 158, n. 1-4, p. 223-227, 2005. DOI: 10.1007/s10751-005-9037-z

    Palavras-Chave: heusler alloys; perturbed angular correlation; magnetic fields; hyperfine structure; magnetic probes; nuclear reactions; pelletron accelerators

  • IPEN-DOC 17249

    CARBONARI, ARTUR W. ; MESTNIK FILHO, JOSE ; SAXENA, RAJENDRA N. . Impurities in magnetic materials studied by PAC spectroscopy. Defect and Diffusion Forum, v. 311, p. 39-61, 2011. DOI: 10.4028/www.scientific.net/ddf.311.39

    Palavras-Chave: magnetic fields; hyperfine structure; perturbed angular correlation; spectroscopy; magnetic moments; magnetic materials

  • IPEN-DOC 19525

    FREITAS, V.F.; MONTANHER, D.Z.; BONADIO, T.G.M.; MAZZOCCHI, V.L. ; MESTNIK FILHO, J. . Intrinsic features of the magnetoeletric coupling mechanism in displacive multiferroics. Journal of Applied Physics, v. 114, n. 13, p. 134102-1 - 134102-6, 2013.

    Palavras-Chave: ferroelectric materials; magnetic fields; electron density; x radiation; energy resolution; neutron sources; powders; diffraction; lanthanum; bismuth compounds; iron compounds; lead compounds; titanium compounds; perovskites

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

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

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

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

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

Exemplo:

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

Autor: Maprelian

Título: loss of coolant

Tipo de publicação: Texto completo de evento

Ano de publicação: 2015

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

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

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

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

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

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

ATENÇÃO!

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

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

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

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


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

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

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

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

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