Browsing Exact and Earth Sciences by Title

Now showing items 4497-4516 of 5964

    • Role of nuclear gluon distribution on particle production in heavy ion collisions 

      Moriggi, Lucas Soster; Peccini, Guilherme Müller; Machado, Magno Valério Trindade (2021) [Journal article]
      The transverse momentum spectra of hadrons are calculated from the unintegrated gluon distribution (UGD) within the kT-factorization framework at small x. Starting from pp collisions, the modification caused by the nuclear ...

    • Role of spin-transfer torques on synchronization and resonance phenomena in stochastic magnetic oscillators 

      Accioly, Artur Difini; Locatelli, Nicolas; Mizrahi, Alice; Querlioz, Damien; Pereira, Luis Gustavo; Grollier, Julie; Kim, Joo-Von (2016) [Journal article]
      A theoretical study on how synchronization and resonance-like phenomena in superparamagnetic tunnel junctions can be driven by spin-transfer torques is presented. We examine the magnetization of a superparamagnetic free ...

    • Room temperature interactions of water vapor with HfO/sub 2/ films on Si 

      Driemeier, Carlos Eduardo; Gusev, Evgeni P.; Baumvol, Israel Jacob Rabin (2006) [Journal article]
      HfO2 /SiO2/Si 001 thin film structures were exposed at room temperature to water vapor isotopically enriched in 2H and 18O followed by quantification and profiling of these nuclides by nuclear reaction analysis. We showed ...

    • Room temperature molten salts: neoteric "green" solvents for chemical reactions and processes 

      Dupont, Jairton; Consorti, Crestina Susi; Spencer, John (2000) [Journal article]
      Líquidos iônicos, em particular aqueles derivados do cátion 1,3-dialquilimidazólio, que possuem uma ampla faixa de temperatura em suas fases líquidas, pressões de vapores muito pequenas, baixas viscosidades e elevada ...

    • Uma rota para o mercosul : a ponte buenos aires/colonia e as rotas rodoviarias no Rio Grande do Sul 

      Schäffer, Neiva Otero (1997) [Journal article]

    • Rotatable anisotropy and coercivity in exchange-bias bilayers 

      Geshev, Julian Penkov; Pereira, Luis Gustavo; Schmidt, Joao Edgar (2002) [Journal article]
      A phenomenological approach for polycrystalline exchange-bias bilayers is proposed which explains the coercivity enhancement as well as its temperature and coupling strength dependences. In the model, it is assumed that ...

    • Rotatable anisotropy driven training effects in exchange biased Co/CoO films 

      Dias, Thiago; Menéndez Dalmau, Enric; Liu, Haoliang; Van Haesendonck, Christian; Vantomme, A.; Temst, Kristiaan; Schmidt, Joao Edgar; Giulian, Raquel; Geshev, Julian Penkov (2014) [Journal article]
      The training effect for exchange bias in field-cooled Co/CoO bilayers films is investigated. Previous experiments on the same system have shown that, starting from the ascending branch of the first hysteresis loop, coherent ...

    • Rotating Skyrmion in 2+1 dimensions 

      Betz, Michel Emile Marcel; Rodrigues, Hercules Borges; Rodama, Takeshi (1996) [Journal article]
      The collective rotation of the Skyrmion in two-dimensional space is considered. In contradistinction to the three-dimensional case, inertial effects do not spoil the hedgehog form and can, therefore, be investigated ...

    • Rotational dynamics of magnetic particles in suspensions 

      Scherer, Claudio; Matuttis, Hans-Georg (2001) [Journal article]
      An approach for the rotational dynamics of magnetic particles and their magnetic moments, in fluid suspensions, is developed. A possible application is to magnetic resonance in ferrofluids. Based on a generalized Lagrangian ...

    • Roteiro para a experiência de levitação de um imã repelido por um supercondutor no ensino de física 

      Rocha, Fabio Saraiva da; Fraquelli, Henrique Aita (2004) [Journal article]
      Propõe-se um roteiro para a demonstração do fenômeno da supercondutividade através da experiência de levitação de um ímã repelido por uma amostra de YBa2Cu3O7. A experiência é baseada na manifestação do efeito Meissner, ...

    • Roteiros de aprendizagem a partir da transposição didática reflexiva 

      Civiero, Paula Andrea Grawieski; Sant'Ana, Marilaine de Fraga (2013) [Journal article]
      Este artigo busca socializar o produto da dissertação de mestrado profissional em Ensino de Matemática. Apresentamos roteiros de aprendizagem como uma possibilidade educacional para que professores de matemática do Ensino ...

    • Rubin Observatory LSST stars milky way and local volume star clusters roadmap 

      Usher, Christopher; Bonatto, Charles Jose; Chies-Santos, Ana Leonor; Santiago, Basilio Xavier; Floriano, Pedro Ribeiro; Lopes, Pedro dos Santos; Miranda, Nicole Louise Klock; Sobeck, Jennifer S. (2023) [Journal article]
      The Vera C. Rubin Observatory will undertake the Legacy Survey of Space and Time, providing an unprecedented, volume-limited catalog of star clusters in the Southern Sky, including Galactic and extragalactic star clusters. ...

    • Rumo a um modelo conceitual completo : redes de petri e diagramas e/r 

      Heuser, Carlos Alberto; Peres, Eduardo Meira (1989) [Journal article]
      O artigo mostra o uso combinado de diagramas entidade/relaciona mento (E/R) e redes de Petri na modelagem conceitual de sistemas. A idéia é combinar uma técnica de modelagem de propriedades estáticà.s largamente usada na ...

    • Running coupling and pomeron loop effects on inclusive and diffractive DIS cross sections 

      Gay Ducati, Maria Beatriz; Oliveira, Emmanuel Gräve de; Amaral, João Thiago de Santana (2012) [Journal article]
      Within the framework of a (1 + 1)-dimensional model which mimics high-energy QCD, we study the behavior of the cross sections for inclusive and diffractive deep inelastic γ h scattering cross sections.We analyze the cases ...

    • Running of the top quark mass from proton-proton collisions at √s = 13 TeV 

      Sirunyan, A. M.; Silveira, Gustavo Gil da; CMS Collaboration (2020) [Journal article]
      The running of the top quark mass is experimentally investigated for the first time. The mass of the top quark in the modified minimal subtraction (MS¯) renormalization scheme is extracted from a comparison of the differential ...

    • Ruprecht 3 : an old star cluster remnant? 

      Pavani, Daniela Borges; Bica, Eduardo Luiz Damiani; Ahumada, Andrea Veronica; Claria Olmedo, Juan Jose (2003) [Journal article]
      2MASS J and H photometry and integrated spectroscopy are employed to study the nature of the poorly populated compact concentration of stars Ruprecht 3, which was previously catalogued as an open cluster. The integrated ...

    • Rupture of a liposomal vesicle 

      Idiart, Marco Aurelio Pires; Levin, Yan (2004) [Journal article]
      We discuss pore dynamics in osmotically stressed vesicles. A set of equations which govern the liposomal size, internal solute concentration, and pore diameter is solved numerically. We find that dependent on the internal ...

    • O rural agrícola na metrópole : o caso de Porto Alegre, RS 

      Kozenieski, Éverton de Moraes; Medeiros, Rosa Maria Vieira (2018) [Journal article]
      Os espaços rurais vêm apresentando mudanças significativas nas últimas décadas no Brasil. Neles surgem novas características entre as quais pode-se destacar a extinção dos espaços destinados as práticas agrícolas em razão ...

    • Ruralidades na compreensão dos territórios do vinho e sua identidade 

      Flores, Shana Sabbado; Medeiros, Rosa Maria Vieira (2014) [Journal article]
      O estudo de questões envolvendo o rural traz à tona a complexidade inerente ao conceito e tratamento do tema, impondo uma cuidadosa observação de suas relações para uma efetiva compreensão.Nesse sentido, o uso das ruralidades ...

    • Ruthenium dioxide nanoparticles in ionic liquids : synthesis, caracterization and catalytic properties in hydrogenation of olefins and arenes 

      Rossi, Liane Marcia; Dupont, Jairton; Machado, Giovanna; Fichtner, Paulo Fernando Papaleo; Radtke, Claudio; Baumvol, Israel Jacob Rabin; Teixeira, Sergio Ribeiro (2004) [Journal article]
      A reação de NaBH4 com RuCl3 dissolvido no líquido iônico 1-n-butil-3-metilimidazólio hexafluorfosfato (BMI.PF6) é um método simples e reprodutível para a síntese de nanopartículas de RuO2 estáveis com distribuição estreita ...