Navegação Ciências Exatas e da Terra por Título
Resultados 1977-1996 de 5955
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Fire events and vegetation dynamics during the late Pleistocene-Meghalayan interval in the southernmost Brazilian coastal plain comments on the endocranial morphology
(2020) [Artigo de periódico]The present study analyzes the correspondence between charcoal concentrations and changes in the palynological composition in a core from Águas Claras peatland (30º06’24.39” S; 50º49’04.90” W) in the coastal plain of ... -
First cosmology results using SNe Ia from the dark energy survey : analysis, systematic uncertainties, and validation
(2019) [Artigo de periódico]We present the analysis underpinning the measurement of cosmological parameters from 207 spectroscopically classified SNe Ia from the first 3 years of the Dark Energy Survey Supernova Program (DES-SN), spanning a redshift ... -
First detection of the 448 GHz H2O transition in space
(2017) [Artigo de periódico]We present the first detection of the ortho-H2O 423330 transition at 448 GHz in space. We observed this transition in the local (z = 0:010) luminous infrared (IR) galaxy ESO 320-G030 (IRAS F11506-3851) using the Atacama ... -
First measurement of + c production down to pT = 0 in pp and p-Pb collisions at √sNN = 5.02 TeV
(2023) [Artigo de periódico]The production of prompt + c baryons has been measured at midrapidity in the transverse momentum interval 0 < pT < 1 GeV/c for the first time, in pp and p–Pb collisions at a center-of-mass energy per nucleon-nucleon collision ... -
First measurement of jet mass in Pb–Pb and p–Pb collisions at the LHC
(2018) [Artigo de periódico]This letter presents the first measurement of jet mass in Pb–Pband p–Pbcollisions at √sNN=2.76TeV and √sNN=5.02TeV, respectively. Both the jet energy and the jet mass are expected to be sensitive to jet quenching in the ... -
First measurement of large area jet transverse momentum spectra in heavy-ion collisions
(2021) [Artigo de periódico]Jet production in lead-lead (PbPb) and proton-proton (pp) collisions at a nucleon-nucleon center-of-mass energy of 5.02 TeV is studied with the CMS detector at the LHC, using PbPb and pp data samples corresponding to ... -
First measurement of quarkonium polarization in nuclear collisions at the LHC
(2021) [Artigo de periódico]The polarization of inclusive J/ψ and ϒ(1S) produced in Pb–Pb collisions at √sNN = 5.02 TeV at the LHC is measured with the ALICE detector. The study is carried out by reconstructing the quarkonium through its decay to ... -
First measurement of the cross section for top quark pair production with additional charm jets using dileptonic final states in pp collisions at √s = 13 TeV
(2021) [Artigo de periódico]The first measurement of the inclusive cross section for top quark pairs (tt) produced in association with two additional charm jets is presented. The analysis uses the dileptonic final states of tt events produced in ... -
First measurement of the |t|-dependence of coherent J/ψ photonuclear production
(2021) [Artigo de periódico]The first measurement of the cross section for coherent J/ψ photoproduction as a function of |t|, the square of the momentum transferred between the incoming and outgoing target nucleus, is presented. The data were measured ... -
First measurement of Ξ0c production in pp collisions at √s = 7 TeV
(2018) [Artigo de periódico]The production of the charm-strange baryon 0cis measured for the first time at the LHC via its semileptonic decay into e+ −νein ppcollisions at √s=7TeV with the ALICE detector. The transverse momentum (pT) differential ... -
First measurements of N-subjettiness in central Pb-Pb collisions at √sNN = 2.76 TeV
(2021) [Artigo de periódico]The ALICE Collaboration reports the first fully-corrected measurements of the N-subjettiness observable for track-based jets in heavy-ion collisions. This study is performed using data recorded in pp and Pb-Pb collisions ... -
First observation of an attractive interaction between a proton and a cascade baryon
(2019) [Artigo de periódico]This Letter presents the first experimental observation of the attractive strong interaction between a proton and a multistrange baryon (hyperon) Ξ−. The result is extracted from two-particle correlations of combined ... -
First-principles calculation of the structure and elastic properties of a 3D-polymerized fullerite
(2002) [Artigo de periódico]In this paper we present results obtained from first-principles calculations concerning the crystal structure and elastic properties of a three-dimensional-polymerized fullerite. The orthorhombic structure we studied was ... -
First 'Rauisuchian' archosaur (Pseudosuchia, Loricata) for the Middle Triassic Santacruzodon Assemblage Zone (SantaMaria Supersequence), Rio Grande do Sul State, Brazil
(2015) [Artigo de periódico]The ‘Rauisuchia’ are a group of Triassic pseudosuchian archosaurs that displayed a near worldwide distribution. In Brazil, their fossils are found only in the Santa Maria Formation (Paraná Basin) of the Rio Grande do Sul ... -
First report of chemical composition and cytotoxicity evaluation of Foraminispora rugosa basidiomata from Brazil
(2022) [Artigo de periódico]Foraminispora rugosa is a species reported from Brazil, Venezuela, French Guiana, Costa Rica and Cuba. It is a basidiomycete in the Ganodermataceae family. In this study, both chemical composition and cytotoxicity of the ... -
First search for exclusive diphoton production at high mass with tagged protons in proton-proton collisions at √s = 13 TeV
(2022) [Artigo de periódico]A search for exclusive two-photon production via photon exchange in proton-proton collisions, p p → p γ γ p with intact protons, is presented. The data correspond to an integrated luminosity of 9.4 fb −1 collected in 2016 ... -
First study of the two-body scattering involving charm hadrons
(2022) [Artigo de periódico]This article presents the first measurement of the interaction between charm hadrons and nucleons. The two-particle momentum correlations of p D − and ¯ p D + pairs are measured by the ALICE Collaboration inhigh-multiplicity ... -
A física clássica de cabeça para baixo : como Einstein descobriu a teoria da relatividade especial
(2004) [Artigo de periódico]Albert Einstein por duas vezes alterou de maneira profunda nossos conceitos de espaço e tempo com a sua teoria da relatividade: primeiro no âmbito da teoria especial de 1905 e depois com a teoria geral de 1915. Como foi o ... -
A física como uma construção cultural arbitrária : um exemplo da controvérsia sobre o status ontológico das forças inerciais
(2015) [Artigo de periódico]Este artigo parte do conceito de arbitrário cultural da sociologia da educação de Pierre Bourdieu para argumentar que a Física é uma construção cultural arbitrária. A título de exemplo, apresenta-se uma análise crítica do ... -
Física contemporánea en la escuela secundaria : una experiencia en el aula involucrando formación de profesores
(2000) [Artigo de periódico]In this paper we describe our experience in teaching two contemporary physics topics –elementary particles and superconductivity– at high school level. The experience was developed in two years, including topic selection, ...