Navegação Ciências Exatas e da Terra por Título

Resultados 4099-4118 de 5943

    • Principal component analysis of commercial tannin extracts using digital images on mobile devices 

      Grasel, Fábio dos Santos; Ferrão, Marco Flôres; Helfer, Gilson Augusto; Costa, Adilson Ben da (2016) [Artigo de periódico]
      Tannins from trees are an abundant renewable resource. The use of tannins is safe for the environment and human health, making it possible to develop environmentally friendly products, such as adhesives, flocculant agents ...

    • Principal component analysis of C-SAR images for flood mapping , Santa Fe Province, Argentina 

      Graosque, Jones Zamboni; Guasselli, Laurindo Antônio (2020) [Artigo de periódico]
      Flood events are phenomena associated with heavy rainfall. In Argentina, floods have high economic and social costs, including loss of human life. In this paper, principal component analysis (PCA) is used to map flood-prone ...

    • Princípios e aplicações de regressão local 

      Marquetti, Adalmir Antonio; Viali, Lorí (2004) [Artigo de periódico]
      Este texto discute os princípios e realiza três aplicações de regressão local, um método não paramétrico que estima cuevas e superfícies através de suavização (smoothing). Na análise não paramétrica a função é estimada sem ...

    • Os Princípios e fundamentos da legislação das águas na França 

      Berreta, Márcia dos Santos Ramos; Laurent, François; Basso, Luis Alberto (2011) [Artigo de periódico]
      Este artigo trata do sistema de gestão, adotado pela França, para preservar o bom estado ecológico das suas águas superficiais e subterrâneas. O objetivo deste estudo é compreender a evolução do processo de regularização ...

    • Os privilégios da branquitude e a reprodução de desigualdades sociais na educação brasileira 

      Nascimento, Matheus Monteiro (2020) [Artigo de periódico]
      Os estudos críticos da branquitude tiveram a sua emergência em meados dos anos 1990. Esta perspectiva surge no contexto das pesquisas sobre as relações étnico-raciais a fim de problematizar toda uma estrutura de favorecimento ...

    • Probabilidade do erro do tipo I nas cartas X e S de Shewhart sob não normalidade 

      Korzenowski, Andre Luis; Werner, Liane (2012) [Artigo de periódico]
      O objetivo deste artigo é verificar o comportamento das cartas de média e desvio padrão de Shewhart em relação à probabilidade do erro do tipo I quando da violação da suposição de normalidade. Foi realizada a simulação de ...

    • Probabilistic approach for yield analysis of dynamic logic circuits 

      Brusamarello, Lucas; Silva, Roberto da; Wirth, Gilson Inacio; Reis, Ricardo Augusto da Luz (2008) [Artigo de periódico]
      In deep-submicrometer technologies, process variability challenges the design of high yield integrated circuits. While device critical dimensions and threshold voltage shrink, leakage currents drastically increase, threatening ...

    • Probabilistic modelling of wildfire occurrence based on logistic regression, Niassa Reserve, Mozambique 

      Nhongo, Eufrasio Joao Sozinho; Fontana, Denise Cybis; Guasselli, Laurindo Antônio; Bremm, Carolina (2019) [Artigo de periódico]
      Fires are one of the main factors for disturbances in Niassa Reserve-Mozambique, with economic and environmental impacts. There are cyclical records of fire occurrences across the reserve. However, studies on the main ...

    • Probing charm quark dynamics via multiparticle correlations in Pb-Pb collisions at √sNN = 5.02  TeV 

      Tumasyan, Armen; Silveira, Gustavo Gil da; CMS Collaboration (2022) [Artigo de periódico]
      Multiparticle azimuthal correlations of prompt D0 mesons are measured in Pb-Pb collisions at a nucleon-nucleon center-of-mass energy of √sNN=5.02  TeV. For the first time, a four-particle cumulant method is used to extract ...

    • Probing disk properties with open clusters 

      Bonatto, Charles Jose; Bica, Eduardo Luiz Damiani; Kerber, Leandro de Oliveira; Santiago, Basilio Xavier (2006) [Artigo de periódico]
      We use the open clusters (OCs) with known parameters available in theWEBDA database and in recently published papers to derive properties related to the disk structure such as the thin-disk scale height, displacement of ...

    • Probing effective field theory operators in the associated production of top quarks with a Z boson in multilepton final states at √s = 13 TeV 

      Tonon, N.; Silveira, Gustavo Gil da; Bernardes, César Augusto; CMS Collaboration (2021) [Artigo de periódico]
      A search for new top quark interactions is performed within the framework of an effective field theory using the associated production of either one or two top quarks with a Z boson in multilepton final states. The data ...

    • Probing embedded star clusters in the HII complex NGC6357 with VVV 

      Lima, Eliade Ferreira; Bica, Eduardo Luiz Damiani; Bonatto, Charles Jose; Saito, Roberto K. (2014) [Artigo de periódico]
      Context. NGC6357 is an active star-forming region located in the Sagittarius arm that displays several star clusters, which makes it a very interesting target to investigate star formation and early cluster evolution. Aims. ...

    • Probing evolutionary population synthesis models in the near infrared with early-type galaxies 

      Hahn, Luis Gabriel Dahmer; Riffel, Rogério; Rodriguez-Ardila, Alberto; Martins, Lucimara Pires; Kehrig, Carolina; Heckman, Timothy M.; Pastoriza, Miriani Griselda; Dametto, Natacha Zanon (2018) [Artigo de periódico]
      We performed a near-infrared (NIR; ∼1.0 –2.4 μm) stellar population study in a sample of early-type galaxies. The synthesis was performed using five different evolutionary population synthesis libraries of models. Our main ...

    • Probing FSR star cluster candidates in bulge/disc directions with 2MASS colour-magnitude diagrams 

      Bica, Eduardo Luiz Damiani; Bonatto, Charles Jose; Camargo, Denilso da Silva (2008) [Artigo de periódico]
      We analyse 20 star cluster candidates projected mostly in the bulge direction (| | < 60◦). The sample contains all candidates in that sector classified by Froebrich, Scholz & Raftery with quality flags denoting high ...

    • Probing mass segregation in the globular cluster NGC 6397 

      Martinazzi, Elizandra; Pieres, Adriano; Kepler, Souza Oliveira; Costa, Jose Eduardo da Silveira; Bonatto, Charles Jose; Bica, Eduardo Luiz Damiani (2014) [Artigo de periódico]
      In this study, we present a detailed study of mass segregation in the globular cluster NGC 6397. First, we carry out a photometric analysis of projected European SouthernObservatory (ESO)– Very Large Telescope (VLT) data ...

    • Probing nuclear starburst activity in a sample of nearby spiral galaxies 

      Bonatto, Charles Jose; Pastoriza, Miriani Griselda; Alloin, Danielle Marie; Bica, Eduardo Luiz Damiani (1998) [Artigo de periódico]
      As part of a systematic study of the UV properties of galaxies in the IUE library,we present in this paper an analysis of nuclear stellar populations in spiral galaxies with radial velocity ≤ 5 000kms-ˡ. In this sample of ...

    • Probing the active galactic nucleus unified model torus properties in Seyfert galaxies 

      Audibert, Anelise; Riffel, Rogério; Sales, Dinalva Aires de; Pastoriza, Miriani Griselda; Dutra, Daniel Ruschel (2017) [Artigo de periódico]
      We studied the physical parameters of a sample comprising of all Spitzer/Infrared Spectrograph public spectra of Seyfert galaxies in the mid-infrared (5.2–38 μm range) under the active galactic nucleus (AGN) unified model. ...

    • Probing the age and structure of the nearby very young open clusters NGC2244 and 2239 

      Bonatto, Charles Jose; Bica, Eduardo Luiz Damiani (2009) [Artigo de periódico]
      The very young open cluster (OC) NGC2244 in the Rosette Nebula was studied with fieldstar- decontaminated Two-Micron All-Sky Survey (2MASS) photometry, which shows the main-sequence (MS) stars and an abundant pre-MS (PMS) ...

    • Probing the circumnuclear stellar populations of Starburst galaxies in the near-infrared 

      Dametto, Natacha Zanon; Riffel, Rogério; Pastoriza, Miriani Griselda; Rodriguez-Ardila, Alberto; Hernández Jiménez, José Andrés; Carvalho, Elaine Aparecida (2014) [Artigo de periódico]
      We employ the NASA Infrared Telescope Facility’s near-infrared spectrograph SpeX at 0.8– 2.4 μm to investigate the spatial distribution of the stellar populations (SPs) in the four well-known starburst galaxies: NGC 34, ...

    • Probing the effects of strong electromagnetic fields with charge-dependent directed flow in Pb-Pb collisions at the LHC 

      Acharya, Shreyasi; Gay Ducati, Maria Beatriz; Pereira, Luis Gustavo; Pezzi, Rafael Peretti; ALICE Collaboration (2020) [Artigo de periódico]
      The first measurement at the LHC of charge-dependent directed flow (v1) relative to the spectator plane is presented for Pb-Pb collisions at √sNN=5.02  TeV. Results are reported for charged hadrons and D0 mesons for the ...