Listar Ciencias Exactas y Naturales por título

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    • Dados comparativos sobre a evasão em física, matemática, química e biologia da Universidade Estadual de Londrina : 1996 a 2004 

      Arruda, Sergio de Mello; Carvalho, Marcelo Alves de; Passos, Marinez Meneghello; Silveira, Fernando Lang da (2006) [Artículo de periódico]
      O presente trabalho apresenta alguns dados sobre a evasão nos cursos de Física, Matemática, Biologia e Química da Universidade Estadual de Londrina. A novidade do trabalho consiste, principalmente, em uma nova maneira de ...

    • Da Lei de Titius-Bode ao embate entre a Matéria Escura e a Dinâmica de Newton Modificada uma trajetória epistemológica pela Astronomia 

      Lima, Nathan Willig; Alves-Brito, Alan; Nascimento, Matheus Monteiro (2022) [Artículo de periódico]
      Nos cursos de licenciatura, usualmente, as discussões sobre Epistemologia são feitas de forma desconectada das discussões técnicas, muitas vezes realizadas apenas em disciplinas específicas. Buscando romper com esse abismo ...

    • Damage accumulation in neon implanted silicon 

      Oliviero, Erwan Marie Hubert; Peripolli, Suzana Bottega; Amaral, Livio; Fichtner, Paulo Fernando Papaleo; Beaufort, Marie France; Barbot, Jean François; Donnelly, Stephen Eastwood (2006) [Artículo de periódico]
      Damage accumulation in neon-implanted silicon with fluences ranging from 5x1014 to 5x1016 Ne cm-² has been studied in detail. As-implanted and annealed samples were investigated by Rutherford backscattering spectrometry ...

    • Damage accumulation in Si crystal during ion implantation at elevated temperatures : evidence of chemical effects 

      Souza, Joel Pereira de; Suprun-Belevich, Yu.; Boudinov, Henri Ivanov; Cima, Carlos Alberto (2000) [Artículo de periódico]
      Damage in Si induced by irradiation with various light/medium mass ions at elevated temperatures and high doses (>=3x1016 cm-²) was studied using Rutherford backscattering spectroscopy, cross-section transmission electron ...

    • 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 (2016) [Artículo de periódico]
      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 ...

    • Dark Energy Survey Year 1 results : cosmological constraints from cluster abundances, weak lensing, and galaxy correlations 

      To, Chun-Hao; Santiago, Basilio Xavier; DES Collaboration (2021) [Artículo de periódico]
      We present the first joint analysis of cluster abundances and auto or cross-correlations of three cosmic tracer fields: galaxy density, weak gravitational lensing shear, and cluster density split by optical richness. From ...

    • Dark Energy Survey Year 1 results : cosmological constraints from galaxy clustering and weak lensing 

      Abbott, Timothy M. C.; Santiago, Basilio Xavier; DES Collaboration (2018) [Artículo de periódico]
      We present cosmological results from a combined analysis of galaxy clustering and weak gravitational lensing, using 1321 deg2 of griz imaging data from the first year of the Dark Energy Survey (DES Y1).We combine three ...

    • Dark Energy Survey Year 1 results : measurement of the baryon acoustic oscillation scale in the distribution of galaxies to redshift 1 

      Abbott, Timothy M. C.; Santiago, Basilio Xavier; DES Collaboration (2019) [Artículo de periódico]
      We present angular diameter distance measurements obtained by locating the baryon acoustic oscillations (BAO) scale in the distribution of galaxies selected from the first year of Dark Energy Survey data. We consider a ...

    • Dark Energy Survey Year 1 results : redshift distributions of the weak-lensing source galaxies 

      Hoyle, Ben; Santiago, Basilio Xavier; DES Collaboration (2018) [Artículo de periódico]
      We describe the derivation and validation of redshift distribution estimates and their uncertainties for the populations of galaxies used as weak-lensing sources in the Dark Energy Survey (DES) Year 1 cosmological analyses. ...

    • Dark Energy Survey Year 3 results : cosmological constraints from galaxy clustering and galaxy-galaxy lensing using the MAGLIM lens sample 

      Porredon, Anna; Santiago, Basilio Xavier; DES Collaboration (2022) [Artículo de periódico]
      The cosmological information extracted from photometric surveys is most robust when multiple probes of the large scale structure of the Universe are used. Two of the most sensitive probes are the clustering of galaxies and ...

    • Datação de processos diagenéticos em arenitos-reservatório de hidrocarbonetos : uma revisão conceitual 

      Maraschin, José Anderson; Mizusaki, Ana Maria Pimentel (2008) [Artículo de periódico]
      Geochronology has became a powerfull tool for diagenetic studies in siliciclastic rocks as it supply parameters for the definition of their depositional or diagenetic ages. This development occurred particularly in the ...

    • Data-driven precision determination of the material budget in ALICE 

      Acharya, Shreyasi; Gay Ducati, Maria Beatriz; Pereira, Luis Gustavo; ALICE Collaboration (2023) [Artículo de periódico]
      The knowledge of the material budget with a high precision is fundamental for measurements of direct photon production using the photon conversion method due to its direct impact on the total systematic uncertainty. Moreover, ...

    • Data release 2 of S-PLUS : accurate template-fitting based photometry covering ∼1000 deg2 in 12 optical filters 

      Fernandes, Felipe de Almeida; Bonatto, Charles Jose; Chies-Santos, Ana Leonor; Hartmann, Eduardo Albuquerque; Oliveira, Claudia Lucia Mendes de (2022) [Artículo de periódico]
      The Southern Photometric Local Universe Survey (S-PLUS) is an ongoing survey of ∼9300 deg2 in the southern sky in a 12-band photometric system. This paper presents the second data release (DR2) of S-PLUS, consisting of 514 ...

    • Dataset of metals and metalloids in food crops and soils sampled across the mining region of Moquegua in Peru 

      Bedoya Perales, Noelia Soledad; Escobedo Pacheco, Elias; Maus, Diogo; Neimaier, Alisson Silva; Pumi, Guilherme (2023) [Artículo de periódico]
      In recent years, there has been an increase in interest in the accumulation of heavy metals and metal(loid)s (HMM) in areas where agriculture and mining exist side by side. As a contribution to this body of knowledge, we ...

    • Dating star clusters in the Small Magellanic Cloud by means of integrated spectra 

      Ahumada, Andrea Veronica; Claria Olmedo, Juan Jose; Bica, Eduardo Luiz Damiani; Dutra, Carlos Maximiliano (2002) [Artículo de periódico]
      In this study flux-calibrated integrated spectra in the range (3600–6800) Å are presented for 16 concentrated star clusters in the Small Magellanic Cloud (SMC), approximately half of which constitute unstudied objects. We ...

    • David Bloor e o “programa forte” da sociologia da Ciência : um debate sobre a natureza da Ciência 

      Massoni, Neusa Teresinha; Moreira, Marco Antonio (2020) [Artículo de periódico]
      Neste trabalho são analisados enunciados produzidos por 20 professores de física em uma atividade proposta durante um curso de extensão à distância. A partir da leitura de um texto acadêmico, os professores deveriam postar, ...

    • DB white dwarfs in the Sloan Digital Sky Survey data release 10 and 12 

      Koester, Detlev; Kepler, Souza Oliveira (2015) [Artículo de periódico]
      Aims. White dwarfs with helium-dominated atmospheres (spectral types DO, DB) comprise approximately 20% of all white dwarfs. There are fewer studies than of their hydrogen-rich counterparts (DA) and thus several questions ...

    • A decade of near-infrared variability in NGC4388 : insights into the AGN structure 

      Hahn, Luis Gabriel Dahmer; Rodriguez-Ardila, Alberto; Bianchin, Marina; Riffel, Rogemar André; Riffel, Rogério; Storchi-Bergmann, Thaisa; Hao, Lei (2023) [Artículo de periódico]
      Variability studies have proven to be a powerful diagnostic tool for understanding the physics and properties of active galactic nuclei (AGNs). They provide insightsinto the spatial and temporal distribution of the emitting ...

    • Deciphering 40 TeV rapidity gap physics with 2 TeV jet events 

      Chehime, H.; Gay Ducati, Maria Beatriz; Duff, A.; Halzen, Francis; Natale, Adriano Antonio; Stelzer, T.; Zeppenfeld, D. (1992) [Artículo de periódico]
      Rapidity gaps may provide an adequate signature for electroweak processes at supercolliders, including the production of the Higgs particle. We show how this important issue can be studied in the dijet final states of ...

    • Decodificando o código de barras 

      Rodrigues, Luís Gustavo Pires; Heidemann, Leonardo Albuquerque; De Carli, Eloir; Silveira, Lucas Gabriel Mota da (2011) [Artículo de periódico]