Mostrando recursos 1 - 20 de 42

  1. Uso de um texto de apoio como organizador prévio : combinatória para o ensino fundamental e ensino médio

    Silva, J. R. da; Moreira, Marco Antonio
    Os professores participantes de cursos de extensão, especialização e formação continuada, dentre as várias dificuldades, de forma ampla se destaca a passagem da postura positivista para o construtivista. Este estudo intenta suavizar esta passagem sugerindo uma formação que possibilite aos aprendizes e ensinantes uma evolução cognitiva aportada na aprendizagem significativa (Ausubel, 1978). Para isso, se construiu um Material didático (texto de apoio) e, posteriormente, foi testado numa turma (32 alunos) de um Curso de Especialização. Os critérios adotados para valorar a diferenciação progressiva (DP) e a reconciliação integradora (RI) no âmbito da Combinatória, a partir dos princípios aditivos e multiplicativos,...

  2. Uso de um texto de apoio como organizador prévio : combinatória para o ensino fundamental e ensino médio

    Silva, J. R. da; Moreira, Marco Antonio
    Os professores participantes de cursos de extensão, especialização e formação continuada, dentre as várias dificuldades, de forma ampla se destaca a passagem da postura positivista para o construtivista. Este estudo intenta suavizar esta passagem sugerindo uma formação que possibilite aos aprendizes e ensinantes uma evolução cognitiva aportada na aprendizagem significativa (Ausubel, 1978). Para isso, se construiu um Material didático (texto de apoio) e, posteriormente, foi testado numa turma (32 alunos) de um Curso de Especialização. Os critérios adotados para valorar a diferenciação progressiva (DP) e a reconciliação integradora (RI) no âmbito da Combinatória, a partir dos princípios aditivos e multiplicativos,...

  3. Método do enxame de partículas para otimização de modelos de regressão multivariada empregados na determinação de biodiesel em blendas biodiesel/óleo vegetal/diesel

    Rizzi, Marlize; Furtado, João Carlos; Costa, Adilson Ben da; Gerbase, Annelise Engel; Ferrão, Marco Flôres
    Foram comparados diferentes modelos de regressão multivariada por mínimos quadrados parciais para a quantificação de biodiesel nas blendas binárias e ternárias biodiesel/óleo vegetal/diesel empregando espectrofotometria no infravermelho médio com reflexão total atenuada (FTIR/ATR). Um total de oitenta blendas binárias ou ternárias foram empregadas para a construção e validação dos modelos. O método do enxame de partículas (PSO) foi implementado para a otimização das regiões espectrais juntamente com a regressão por mínimos quadrados parciais por intervalo (iPLS). Dentre os modelos por PLS empregando: toda a faixa espectral 4000-650 cm-1, as regiões espectrais sugeridas pela norma ASTM NBR 15568 (1750-1735 cm-1 e...

  4. Spin-glass phase transition and behavior of nonlinear susceptibility in the Sherrington-Kirkpatrick model with random fields

    Morais, C. V.; Zimmer, Fábio Mallmann; Lazo, Matheus Jatkoske; Magalhaes, Sergio Garcia; Nobre, Fernando D.
    The behavior of the nonlinear susceptibility χ3 and its relation to the spin-glass transition temperature Tf in the presence of random fields are investigated. To accomplish this task, the Sherrington-Kirkpatrick model is studied through the replica formalism, within a one-step replica-symmetry-breaking procedure. In addition, the dependence of the Almeida-Thouless eigenvalue λAT (replicon) on the random fields is analyzed. Particularly, in the absence of random fields, the temperature Tf can be traced by a divergence in the spin-glass susceptibility χSG, which presents a term inversely proportional to the replicon λAT. As a result of a relation between χSG and χ3, the...

  5. Fate of topological states in incommensurate generalized Aubry-André models

    Cestari, Jardel Caminha Carvalho; Foerster, Angela; Gusmao, Miguel Angelo Cavalheiro
    We study one-dimensional optical lattices described by generalized Aubry-André models that include both commensurate and incommensurate modulations of the hopping amplitude. This brings together two interesting features of this class of systems: Anderson localization and the existence of topological edge states. We follow changes of the single-particle energy spectrum induced by variations of the system parameters, with focus on the survival of topological states in the localized regime.

  6. A SINFONI view of the nuclear activity and circumnuclear star formation in NGC 4303

    Riffel, Rogemar André; Colina, Luis; Storchi-Bergmann, Thaisa; Piqueras López, Javier; Arribas, Santiago; Riffel, Rogério; Pastoriza, Miriani Griselda; Sales, Dinalva Aires de; Dametto, Natacha Zanon; Labiano, Alvaro; Davies, Richard I.
    We present new maps of emission-line flux distributions and kinematics in both ionized (traced by HI and [Fe II] lines) and molecular (H2) gas of the inner 0.7 × 0.7 kpc2 of the galaxy NGC 4303, with a spatial resolution 40–80 pc and velocity resolution 90–150 km s−1 obtained from near-IR integral field spectroscopy using the Very Large Telescope instrument SINFONI. The most prominent feature is a 200–250 pc ring of circumnuclear star-forming regions. The emission from ionized and molecular gas shows distinct flux distributions: while the strongest HI and [Fe II] emission comes from regions in the west side...

  7. redMaGiC : selecting luminous red galaxies from the DES Science Verification data

    Rozo, Eduardo; Rykoff, Eli; Abate, Alexandra; Bonnet, Christopher Clive; Crocce, Martin; Davis, Christopher P.; Hoyle, Ben; Leistedt, Boris; Peiris, Hiranya V.; Wechsler, Risa H.; Abbott, Timothy M. C.; Abdalla, Filipe B.; Banerji, M.; Bauer, Anne Hollister; Benoit-Lévy, Aurélien; Bernstein, Gary M.; Bertin, Emmanuel; Brooks, D.; Buckley-Geer, Elizabeth; Burke, David Lyle; Capozzi, Diego; Carnero Rosell, Aurelio; Carollo, Daniela; Carrasco Kind, Matías; Carretero Palacios, Jorge; Castander Serentill, Francisco Javier; Childress, Michael; Cunha, Carlos Eduardo; D'Andrea, Christopher B.; Davis, Tamara M.; DePoy, Darren L.; Desai, S.; Diehl, H. Thomas; Dietrich, Jörg P.; Doel, Peter; Eifler, Tim; Evrard, August E.; Fausti Neto, Angelo; Flaugher, Brenna; Fosalba Vela, Pablo; Frieman, Joshua A.; Gaztañaga, Enrique; Gerdes, David W.; Glazebrook, Karl; Gruen, Daniel; Gruendl, Robert A.; Honscheid, K.; James, David J.; Jarvis, Michael; Kim, A. G.; Kuehn, Kyler; Kuropatkin, Nikolay P.; Lahav, Ofer; Lewis, Geraint F.; Lidman, Chris; Lima, Marcos Vinicius Borges Teixeira; Maia, Marcio Antonio Geimba; March, Marisa Cristina; Martini, Paul; Melchior, Peter M.; Miller, Christopher J.; Miquel, Ramon; Mohr, Joseph J.; Nichol, Robert C.; Nord, Brian Dennis; O'Neill, C. R.; Ogando, Ricardo L.C.; Plazas Malagón, Andrés Alejandro; Romer, Anita K.; Roodman, Aaron; Sako, Masao; Sanchez-Alvaro, Eusebio; Santiago, Basilio Xavier; Schubnell, Michael; Sevilla Noarbe, Ignacio; Smith, Robert Christopher; Soares-Santos, Marcelle; Sobreira, Flávia; Suchyta, Eric; Swanson, Molly E. C.; Thaler, Jon J.; Thomas, Daniel B.; Uddin, Syed; Vikram, Vinu; Walker, Alistair; Wester, William Carl; Zhang, Yuying; Costa, Luiz N. da
    We introduce redMaGiC, an automated algorithm for selecting luminous red galaxies (LRGs). The algorithm was specifically developed to minimize photometric redshift uncertainties in photometric large-scale structure studies. redMaGiC achieves this by self-training the colour cuts necessary to produce a luminosity-thresholded LRG sample of constant comoving density. We demonstrate that redMaGiC photo-zs are very nearly as accurate as the best machine learning-based methods, yet they require minimal spectroscopic training, do not suffer from extrapolation biases, and are very nearly Gaussian. We apply our algorithm to Dark Energy Survey (DES) Science Verification (SV) data to produce a redMaGiC catalogue sampling the redshift...

  8. Alternative method to characterize continuous and discontinuous phase transitions in surface reaction models

    Fernandes, Henrique Almeida; Silva, Roberto da; Santos, Eder D.; Gomes, Paulo F.; Arashiro, Everaldo Y.
    In this paper we revisited the Ziff-Gulari-Barshad model to study its phase transitions and critical exponents through time-dependent MonteCarlo simulations.We use amethod proposed recently to locate the nonequilibrium second-order phase transitions and that has been successfully used in systems with defined Hamiltonians and with absorbing states. This method, which is based on optimization of the coefficient of determination of the order parameter, was able to characterize the continuous phase transition of the model, as well as its upper spinodal point, a pseudocritical point located near the discontinuous phase transition. The static critical exponents β, ν , and ν⊥, as well...

  9. Physical properties of star clusters in the outer LMC as observed by the DES

    Pieres, Adriano; Santiago, Basilio Xavier; Balbinot, Eduardo; Luque Canaza, Elmer Fidel; Queiroz, Anna Bárbara de Andrade; Costa, Luiz N. da; Maia, Marcio Antonio Geimba; Drlica-Wagner, Alex; Roodman, Aaron; Abbott, Timothy M. C.; Allam, Sahar S.; Benoit-Lévy, Aurélien; Bertin, Emmanuel; Brooks, D.; Buckley-Geer, E.; Burke, David Lyle; Carnero Rosell, Aurelio; Carrasco Kind, Matías; Carretero Palacios, Jorge; Cunha, Carlos Eduardo; Desai, S.; Diehl, H. Thomas; Eifler, Tim; Finley, David A.; Flaugher, Brenna; Fosalba Vela, Pablo; Frieman, Joshua A.; Gerdes, David W.; Gruen, Daniel; Gruendl, Robert A.; Gutierrez, Gaston R.; Honscheid, K. (Klaus); James, David J.; Kuehn, Kyler; Kuropatkin, Nikolay P.; Lahav, Ofer; Li, T. S.; Marshall, Jennifer L.; Martini, Paul; Miller, Christopher J.; Miquel, Ramon; Nichol, Robert C.; Nord, Brian Dennis; Ogando, Ricardo L.C.; Plazas Malagón, Andrés Alejandro; Romer, Anita K.; Sanchez-Alvaro, Eusebio; Scarpine, Victor Emanuel; Schubnell, Michael; Sevilla Noarbe, Ignacio; Smith, Robert Christopher; Soares-Santos, Marcelle; Sobreira, Flávia; Suchyta, Eric; Swanson, Molly E. C.; Tarle, Gregory; Thaler, Jon J.; Thomas, D.; Tucker, Douglas L.; Walker, Alistair
    The Large Magellanic Cloud (LMC) harbours a rich and diverse system of star clusters, whose ages, chemical abundances and positions provide information about the LMC history of star formation. We use Science Verification imaging data from the Dark Energy Survey (DES) to increase the census of known star clusters in the outer LMC and to derive physical parameters for a large sample of such objects using a spatially and photometrically homogeneous data set. Our sample contains 255 visually identified cluster candidates, of which 109 were not listed in any previous catalogue. We quantify the crowding effect for the stellar sample...

  10. Physical properties of star clusters in the outer LMC as observed by the DES

    Pieres, Adriano; Santiago, Basilio Xavier; Balbinot, Eduardo; Luque Canaza, Elmer Fidel; Queiroz, Anna Bárbara de Andrade; Costa, Luiz N. da; Maia, Marcio Antonio Geimba; Drlica-Wagner, Alex; Roodman, Aaron; Abbott, Timothy M. C.; Allam, Sahar S.; Benoit-Lévy, Aurélien; Bertin, Emmanuel; Brooks, D.; Buckley-Geer, E.; Burke, David Lyle; Carnero Rosell, Aurelio; Carrasco Kind, Matías; Carretero Palacios, Jorge; Cunha, Carlos Eduardo; Desai, S.; Diehl, H. Thomas; Eifler, Tim; Finley, David A.; Flaugher, Brenna; Fosalba Vela, Pablo; Frieman, Joshua A.; Gerdes, David W.; Gruen, Daniel; Gruendl, Robert A.; Gutierrez, Gaston R.; Honscheid, K. (Klaus); James, David J.; Kuehn, Kyler; Kuropatkin, Nikolay P.; Lahav, Ofer; Li, T. S.; Marshall, Jennifer L.; Martini, Paul; Miller, Christopher J.; Miquel, Ramon; Nichol, Robert C.; Nord, Brian Dennis; Ogando, Ricardo L.C.; Plazas Malagón, Andrés Alejandro; Romer, Anita K.; Sanchez-Alvaro, Eusebio; Scarpine, Victor Emanuel; Schubnell, Michael; Sevilla Noarbe, Ignacio; Smith, Robert Christopher; Soares-Santos, Marcelle; Sobreira, Flávia; Suchyta, Eric; Swanson, Molly E. C.; Tarle, Gregory; Thaler, Jon J.; Thomas, D.; Tucker, Douglas L.; Walker, Alistair
    The Large Magellanic Cloud (LMC) harbours a rich and diverse system of star clusters, whose ages, chemical abundances and positions provide information about the LMC history of star formation. We use Science Verification imaging data from the Dark Energy Survey (DES) to increase the census of known star clusters in the outer LMC and to derive physical parameters for a large sample of such objects using a spatially and photometrically homogeneous data set. Our sample contains 255 visually identified cluster candidates, of which 109 were not listed in any previous catalogue. We quantify the crowding effect for the stellar sample...

  11. Effects of the quark-hadron phase transition on highly magnetized neutron stars

    Franzon, Bruno; Gomes, Rosana de Oliveira; Schramm, Stefan
    The presence of quark-hadron phase transitions in neutron stars can be related to several interesting phenomena. In particular, previous calculations have shown that fast rotating neutron stars, when subjected to a quark-hadron phase transition in their interiors, could give rise to the backbending phenomenon characterized by a spin-up era. In this work, we use an equation of state composed of two phases, containing nucleons (and leptons) and quarks. The hadronic phase is described in a relativistic mean field formalism that takes many-body forces into account, and the quark phase is described by the MIT bag model with a vector interaction....

  12. Construindo a base de dados de teses, dissertações e monongrafias sobre estudos fronteiriços

    Rocha, Rafael Port da; Dorfman, Adriana; França, Arthur Borba Colen

  13. Redes e divulgação do Unbral Fronteiras

    Dorfman, Adriana; Muller, Karla Maria

  14. Fronteiras Sul-americanas : história, formas e processos contemporâneos

    Dorfman, Adriana; França, Arthur Borba Colen; Assumpção, Marla Barbosa

  15. Contextual and individual factors associated with dissatisfaction with the Brazilian Unified National Health System, 2011-2012

    Passero, Lúcia Gimenes; Giordani, Jessye Melgarejo do Amaral; Hugo, Fernando Neves; Torman, Vanessa Bielefeldt Leotti; Camey, Suzi Alves; Hilgert, Juliana Balbinot
    User satisfaction is known to be related to quality of healthcare. The aim of this study was to evaluate the influence of contextual and individual factors associated with user dissatisfaction with the Brazilian Unified National Health System (SUS). This was a cross-sectional multilevel study. Data were collected via telephone by the ombudsman’s office of the SUS. Telephone numbers were randomly selected from a telephone company database. Health services, socioeconomic, and individual demographic variables were evaluated, in addition to information on the municipalities. The outcome variable was dissatisfaction with the SUS. Hierarchical multilevel logistic regression was used, and 18,673 individuals were...

  16. Panorama, percurso e possível agenda para os estudos fronteiriços brasileiros

    Dorfman, Adriana; França, Arthur Borba Colen

  17. Circunscrição temática do Unbral Fronteiras a partir da análise do questionário para experts em estudos fronteiriços

    Dorfman, Adriana; Mezzo, Vitor Galante Monte; França, Arthur Borba Colen

  18. O Unbral Fronteiras em busca de boas práticas na divulgação e preservação da produção acadêmica

    Rocha, Rafael Port da; Dorfman, Adriana

  19. A dark energy camera search for missing supergiants in the LMC after the advanced LIGO gravitational-wave event GW150914

    Annis, James T.; Soares-Santos, Marcelle; Berger, Edo; Brout, Dillon J.; Chen, Hsinyu; Chornock, Ryan; Cowperthwaite, Philip S.; Diehl, H. Thomas; Doctor, Z.; Drlica-Wagner, Alex; Drout, Maria R.; Farr, Benjamin F.; Finley, David A.; Flaugher, Brenna; Foley, Ryan Joseph; Frieman, Joshua A.; Gruendl, Robert A.; Herner, Kenneth R.; Holz, Daniel E.; Kessler, Richard S.; Lin, H.; Marriner, John P.; Neilsen, Eric H.; Rest, Armin; Sako, Masao; Smith, Matthew Wilson L; Smith, Nathan D.; Sobreira, Flávia; Walker, Alistair; Yanny, Brian; Abbott, Timothy M. C.; Abdalla, Filipe B.; Allam, Sahar S.; Benoit-Lévy, Aurélien; Bernstein, Gary M.; Bertin, Emmanuel; Buckley-Geer, Elizabeth; Burke, David Lyle; Capozzi, Diego; Carnero Rosell, Aurelio; Carrasco Kind, Matías; Carretero Palacios, Jorge; Castander Serentill, Francisco Javier; Cenko, Stephen Bradley; Crocce, Martin; Cunha, Carlos Eduardo; D'Andrea, Christopher B.; Costa, Luiz N. da; Desai, S.; Dietrich, Jörg P.; Eifler, Tim; Evrard, August E.; Fernández, Eva María; Fischer, John A.; Fong, Wenfai; Fosalba Vela, Pablo; Fox, Derek B.; Fryer, Chris L.; García-Bellido, Juan; Gaztañaga, Enrique; Gerdes, David W.; Goldstein, Daniel Abraham; Gruen, Daniel; Gutierrez, Gaston R.; Honscheid, K.; James, David J.; Karliner, Inga; Kasen, Daniel N.; Kent, Stephen M.; Kuehn, Kyler; Kuropatkin, Nikolay P.; Lahav, Ofer; Li, T. S.; Lima, Marcos Vinicius Borges Teixeira; Maia, Marcio Antonio Geimba; Martini, Paul; Metzger, Brian D.; Miller, Christopher J.; Miquel, Ramon; Mohr, Joseph J.; Nichol, Robert C.; Nord, Brian Dennis; Ogando, Ricardo L.C.; Peoples, John; Petravick, Donald L.; Plazas Malagón, Andrés Alejandro; Quataert, Eliot J.; Romer, Anita K.; Roodman, Aaron; Rykoff, Eli; Sanchez-Alvaro, Eusebio; Santiago, Basilio Xavier; Scarpine, Victor Emanuel; Schindler, Rafe H.; Schubnell, Michael; Sevilla Noarbe, Ignacio; Sheldon, Erin; Smith, Robert Christopher; Stebbins, Albert J.; Swanson, Molly E. C.; Tarle, Gregory; Thaler, Jon J.; Thomas, Rollin C.; Tucker, Douglas L.; Vikram, Vinu; Wechsler, Risa H.; Weller, Jochen; Wester, William Carl; DES Collaboration
    The collapse of a stellar core is expected to produce gravitational waves (GWs), neutrinos, and in most cases a luminous supernova. Sometimes, however, the optical event could be significantly less luminous than a supernova and a direct collapse to a black hole, where the star just disappears, is possible. The GW event GW150914 was detected by the LIGO Virgo Collaboration via a burst analysis that gave localization contours enclosing the Large Magellanic Cloud (LMC). Shortly thereafter, we used DECam to observe 102 deg2 of the localization area, including 38 deg2 on the LMC for a missing supergiant search. We construct...

  20. Porto Alegre e sua região metropolitana no contexto das contradições da metropolização brasileira contemporânea

    Soares, Paulo Roberto Rodrigues; Fedozzi, Luciano Joel
    O artigo trata de Porto Alegre e sua Região Metropolitana no contexto dos atuais processos de urbanização e metropolização brasileiros. Primeiramente, relacionamos a metropolização de Porto Alegre com as transformações no processo de metropolização em nível mundial e na América Latina, mudanças essas advindas do processo mais amplo de mundialização do capital, no qual se destaca a economia dos serviços e a financeirização da economia e suas repercussões na produção imobiliária e urbana das principais metrópoles e cidades latino-americanas. A seguir, tratamos das especificidades do processo de metropolização de Porto Alegre e sua região metropolitana, abordando os impactos econômicos e...

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