Navegação Ciências Exatas e da Terra por Título

Resultados 4079-4098 de 5955

    • Pressure and chemical substitution effects in the local atomic structure of BaFe2As2 

      Granado, E.; Ferreira, Leticie Mendonca; Garcia, Flávio; Azevedo, Gustavo de Medeiros; Fabbris, Gilberto Fernandes Lopes; Bittar, Eduardo Matzenbacher; Adriano, C.; Garitezi, T. M.; Rosa, P. F. S.; Bufaiçal, L. F.; Avila, M. A.; Terashita, H.; Pagliuso, P. G. (2011) [Artigo de periódico]
      The effects of K and Co substitutions and quasihydrostatic applied pressure (P < 9 GPa) in the local atomic structure of BaFe2As2, Ba(Fe0.937Co0.063)2As2 and Ba0.85K0.15Fe2As2 superconductors were investigated by extended ...

    • Pressure dependence of the refractive index of monoclinic and yttria-stabilized cubic zirconia 

      Balzaretti, Naira Maria; Jornada, Joao Alziro Herz da (1995) [Artigo de periódico]
      The pressure dependence of the refractive index of monoclinic and yttria-stabilized cubic zirconia was measured up to 3 and 8 GPa, respectively, using an interferometric method with the diamond-anvil cell. The experimental ...

    • Pressure-induced phase transitions and volume changes in Hf02 up to Gpa 

      Leger, Jean Michel; Atouf, A.; Tomaszewski, P.E.; Pereira, Altair Soria (1993) [Artigo de periódico]
      The phase transformations and pressure-volume dependence of Hf02 have been investigated at room temperature by angle-dispersive powder x-ray diffraction under high pressure to 50 GPa in a diamond anvil cell. The phase ...

    • Pressure-induced self-insertion reaction in CoSb/sub 3/ 

      Kraemer, Airton Carlos; Gallas, Marcia Russman; Jornada, Joao Alziro Herz da; Perottoni, Claudio Antonio (2007) [Artigo de periódico]
      The thermoelectric material CoSb3, with skutterudite structure, was subjected to high pressures using a diamond anvil cell up to 40 GPa. Above 20 GPa this compound undergoes an irreversible isosymmetric transition to a ...

    • Pressure-induced structural phase transitions in zirconia under high pressure 

      Leger, Jean Michel; Tomaszewski, P.E.; Atouf, A.; Pereira, Altair Soria (1993) [Artigo de periódico]
      Angular-dispersive x-ray in situ powder-diffraction experiments have been performed on pure zirconia, Zr02, at room temperature under high pressure up to 50 GPa. Under increasing pressure four phases were successively ...

    • Pressure induced water insertion in the defect pyrochlore nh/sub 4/nbwo/sub 6/ 

      Perottoni, Claudio Antonio; Jornada, Joao Alziro Herz da (1997) [Artigo de periódico]
      A sudden and reversible increase of about 5% in the unit cell volume of ammonium tungstoniobate at pressures around 2.5 GPa was observed with pressure transmitting media containing water. This behavior was attributed to ...

    • Pressure-support ventilation or T-piece spontaneous breathing trials for patients with chronic obstructive pulmonary disease : a randomized controlled trial 

      Pellegrini, José Augusto Santos; Boniatti, Márcio Manozzo; Boniatti, Viviane M. Corrêa; Zigiotto, Crislene Cattelan; Viana, Marina Verçoza; Nedel, Wagner Luís; Marques, Leonardo da Silva; Santos, Moreno Calcagnotto dos; Almeida, Clarissa Balbão de; Dal Pizzol, Cláudia Pellizzer; Ziegelmann, Patricia Klarmann; Vieira, Silvia Regina Rios (2018) [Artigo de periódico]
      Background Little is known about the best strategy for weaning patients with chronic obstructive pulmonary disease (COPD) from mechanical ventilation. Spontaneous breathing trials (SBT) using a T-piece or pressure-support ...

    • Prevalence and acquisition of MRSA amongst patients admitted to a tertiary-care hospital in Brazil 

      Santos, Helena Barreto dos; Machado, Denise Pires; Camey, Suzi Alves; Kuchenbecker, Ricardo de Souza; Barth, Afonso Luis; Wagner, Mario Bernardes (2010) [Artigo de periódico]
      Background: There are few studies in Brazil that address baseline prevalence of MRSA colonization and associated risk factors at hospital admission, or the incidence of nosocomial colonization. We report a prospective study ...

    • Prevalence, correlates, and description of self-reported diabetes in brazilian capitals : results from a telephone survey 

      Iser, Betine Pinto Moehlecke; Malta, Deborah Carvalho; Duncan, Bruce Bartholow; Moura, Lenildo de; Vigo, Álvaro; Schmidt, Maria Inês (2014) [Artigo de periódico]
      Introduction: The prevalence of diabetes is increasing worldwide. The objective of this study is to estimate the prevalence of self-reported diabetes in Brazilian adults and to describe its population correlates as well ...

    • Prevalence of common α-thalassemia determinants in south Brazil : importance for the diagnosis of microcytic anemia 

      Wagner, Sandrine Comparsi; Castro, Simone Martins de; Gonzalez, Tatiana Pereira; Santin, Ana Paula; Filippon, Letícia; Zaleski, Carina da Fontoura; Azevedo, Laura Alencastro de; Amorin, Bruna; Callegari-Jacques, Sidia Maria; Hutz, Mara Helena (2010) [Artigo de periódico]
      Alpha thalassemia has not been systematically investigated in Brazil. In this study, 493 unrelated individuals from the southernmost Brazilian state of Rio Grande do Sul were screened for deletional forms of -thalassemia. ...

    • Prevalence of ERα-397 PvuII C/T, ERα-351 XbaI A/G and PGR PROGINS polymorphisms in Brazilian breast cancer-unaffected women 

      Giacomazzi, Juliana; Aguiar, E.; Palmero, Edenir Inêz; Schmidt, Adriana Vidal; Skonieski, Giovana; Filho, D.; Bock, Hugo; Pereira, Maria Luiza Saraiva; Ewald, Ingrid Petroni; Faccini, Lavinia Schuler; Camey, Suzi Alves; Caleffi, Maira; Giugliani, Roberto; Prolla, Patrícia Ashton (2012) [Artigo de periódico]
      Polymorphisms of hormone receptor genes have been linked to modifications in reproductive factors and to an increased risk of breast cancer (BC). In the present study, we have determined the allelic and genotypic frequencies ...

    • Prevalence of the BRCA1 founder mutation c.5266dup in brazilian individuals at-risk for the hereditary breast and ovarian cancer syndrome 

      Ewald, Ingrid Petroni; Ribeiro, Patrícia Lisbôa Izetti; Vargas, Fernando Regla; Moreira, Miguel Angelo Martins; Moreira, Aline S.; Moreira Filho, Carlos Alberto; Cunha, Danielle Renzoni; Hamaguchi, Sara; Camey, Suzi Alves; Schmidt, Aishameriane Venes; Caleffi, Maira; Santos, Patrícia Koehler dos; Giugliani, Roberto; Prolla, Patrícia Ashton (2011) [Artigo de periódico]
      About 5-10% of breast and ovarian carcinomas are hereditary and most of these result from germline mutations in the BRCA1 and BRCA2 genes. In women of Ashkenazi Jewish ascendance, up to 30% of breast and ovarian carcinomas ...

    • Prevalence of the STK15 F31I polymorphism and its relationship with mammographic density 

      Giacomazzi, Juliana; Aguiar, Ernestina Silva de; Palmero, Edenir Inêz; Schmidt, Aishameriane Venes; Skonieski, Giovana; Duarte Filho, Dakir Lourenço; Bock, Hugo; Pereira, Maria Luiza Saraiva; Faccini, Lavinia Schuler; Camey, Suzi Alves; Caleffi, Maira; Giugliani, Roberto; Prolla, Patrícia Ashton (2011) [Artigo de periódico]
      Several studies have identified the single nucleotide polymorphism STK15 F31I as a low-penetrance risk allele for breast cancer, but its prevalence and risk association in the Brazilian population have not been determined. ...

    • Prevalence of the TP53 p.R337H mutation in breast cancer patients in Brazil 

      Giacomazzi, Juliana; Graudenz, Márcia Silveira; Osório, Cynthia Aparecida Bueno de Toledo; Santos, Patrícia Koehler dos; Palmero, Edenir Inêz; Oliveira, Marcelo Zagonel de; Michelli, Rodrigo Augusto Depieri; Scapulatempo Neto, Cristovam; Fernandes, Gabriela de Carvalho; Achatz, Maria Isabel Alves de Souza Waddington; Martel-Planche, Ghyslaine; Soares, Fernando A.; Caleffi, Maira; Goldim, José Roberto; Hainaut, Pierre; Camey, Suzi Alves; Prolla, Patrícia Ashton (2014) [Artigo de periódico]
      Germline TP53 mutations predispose individuals to multiple cancers and are associated with Li-Fraumeni/Li-Fraumeni-Like Syndromes (LFS/LFL). The founder mutation TP53 p.R337H is detected in 0.3% of the general population ...

    • Prevalência autorreferida de hipertensão e fatores associados em comunidades quilombolas do Rio Grande do Sul, Brasil 

      Pauli, Sílvia; Bairros, Fernanda Souza de; Nunes, Luciana Neves; Neutzling, Marilda Borges (2019) [Artigo de periódico]
      Este estudo teve como objetivo identificar a prevalência e fatores associados à hipertensão arterial (HA) em adultos quilombolas do Rio Grande do Sul (RS). Trata-se de um estudo transversal de base populacional, realizado ...

    • Prevalência e fatores associados ao consumo de cigarros entre estudantes de escolas estaduais do ensino médio de Santa Maria, Rio Grande do Sul, Brasil, 2002 

      Zanini, Roselaine Ruviaro; Moraes, Anaelena Bragança de; Trindade, Ana Cláudia Antunes; Riboldi, João; Medeiros, Lídia Rosi de Freitas (2006) [Artigo de periódico]
      O tabagismo é a segunda principal causa mundial de morte, sendo responsável pela morte de um a cada dez adultos (5 milhões por ano). Se os padrões atuais se mantiverem, em 2020 o tabagismo será a causa de 10 milhões de ...

    • Preventable risk factors of dementia : population attributable fractions in a Brazilian population-based study 

      Borelli, Wyllians José Vendramini; Leotti, Vanessa Bielefeldt; Strelow, Matheus Zschornack; Chaves, Marcia Lorena Fagundes; Castilhos, Raphael Machado de (2022) [Artigo de periódico]
      Background: Knowledge regarding the modifiable risk factors of dementia is fundamental to guide public health policy. We aimed to estimate the population attributable fraction of modifiable risk factors of dementia among ...

    • Previsão da umidade relaiva do ar diária de Porto Alegre 

      Werner, Liane; Bisognin, Cleber; Menegotto, Letícia (2017) [Artigo de periódico]
      A umidade relativa interfere em vários aspectos na vida do ser humano, e devido as muitas consequências que um baixo ou um alto percentual podem acarretar, o controle de seu nível é de suma importância. Desta forma, realizar ...

    • Previsão de demanda por energia elétrica : método e aplicação 

      Fogliatto, Flavio Sanson; Ribeiro, Jose Luis Duarte; Werner, Liane; Lemos, Fernando de Oliveira; Brum, Marcus Pinto de (2005) [Artigo de periódico]

    • Previsão de demanda : uma aplicação dos modelos Box-Jenkins na área de assistência técnica de computadores pessoais 

      Werner, Liane; Ribeiro, Jose Luis Duarte (2003) [Artigo de periódico]
      A previsão de demanda é uma atividade importante para auxiliar na determinação dos recursos necessários para a empresa. Neste artigo, a metodologia de Box-Jenkins foi utilizada para analisar dados históricos de uma empresa ...