Listar Ciencias Exactas y Naturales por título
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Os objetos de aprendizagem e o desenvolvimento das habilidades espaciais
(2013) [Artículo de periódico]Este artigo aborda o desenvolvimento das habilidades espaciais, como rotação mental, percepção espacial e visualização espacial, com a utilização de objetos digitais de aprendizagem, em alunos do Ensino Fundamental. Para ... -
Oblique Alfvén waves in a stellar wind environment with dust particles charged by inelastic collisions and by photoionization
(2022) [Artículo de periódico]The characteristics of Alfvén waves propagating in a direction oblique to the ambient magnetic field in a stellar wind environment are discussed. A kinetic formulation for a magnetized dusty plasma is adopted considering ... -
Obliquely propagating electromagnetic waves in magnetized kappa plasmas
(2016) [Artículo de periódico]Velocity distribution functions (VDFs) that exhibit a power-law dependence on the high-energy tail have been the subject of intense research by the plasma physics community. Such functions, known as kappa or superthermal ... -
A obra de Boltzmann em física
(2006) [Artículo de periódico]O objetivo do presente trabalho é proporcionar uma visão geral sobre a obra de Boltzmann em Física. Algumas de suas contribuições mais importantes são discutidas e contextualizadas. -
Observational limits on companions to g29-38
(1994) [Artículo de periódico]Recent interest in the variable (DAV) white dwarf G29-38 has been stirred by a tentative report of a radial velocity variation that may be due to an unseen companion. Earlier evidence for a brown dwarf in the system has ... -
Observation of a multiplicity dependence in the pT-differential charm baryon-to-meson ratios in proton–proton collisions at √s = 13 TeV
(2022) [Artículo de periódico]The production of prompt D0, D+ s , and + c hadrons, and their ratios, D+ s /D0 and + c /D0, are measured in proton–proton collisions at √s = 13 TeV at midrapidity (|y| < 0.5) with the ALICE detector at the LHC. The ... -
Observation of a new excited beauty strange baryon decaying to Ξ−bπ+π−
(2021) [Artículo de periódico]The Ξ−bπ+π− invariant mass spectrum is investigated with an event sample of proton-proton collisions at √s=13 TeV, collected by the CMS experiment at the LHC in 2016–2018 and corresponding to an integrated luminosity of ... -
Observation of B0 s mesons and measurement of the B0 s /B+ yield ratio in PbPb collisions at √snn = 5.02 TeV
(2022) [Artículo de periódico]The B0 s and B+ production yields are measured in PbPb collisions at a center-of-mass energy per nucleon pair of 5.02 TeV. The data sample, collected with the CMS detector at the LHC, corresponds to an integrated luminosity ... -
Observation of B0 → ψ(2S)K0Sπ+π− and B0s → ψ(2S)K0S decays
(2022) [Artículo de periódico]Using a data sample of s√=13TeV proton-proton collisions collected by the CMS experiment at the LHC in 2017 and 2018 with an integrated luminosity of 103~fb−1, the B0s→ψ(2S)K0S and B0→ψ(2S)K0Sπ+π− decays are observed with ... -
Observation of collective inner-shell effects for protons backscattered from the Al(110) surface
(2005) [Artículo de periódico]The surface peak of 98-keV protons backscattered from a clean Al (110) surface has been studied in detail for three different scattering geometries. The corresponding energy-loss distributions are asymmetric due to the ... -
Observation of deterministic chaos in electrical discharges in gases
(1987) [Artículo de periódico]We report that dc-excited discharges in gases display current oscillations which develop into deterministically chaotic behavior. A period-doubling route to chaos characteristic of 1D maps is established for sealed discharges ... -
Observation of electroweak production of Wγ with two jets in proton-proton collisions at √s = 13 TeV
(2020) [Artículo de periódico]A first observation is presented for the electroweak production of a W boson, a photon, and two jets in proton-proton collisions. The W boson decays are selected by requiring one identified electron or muon and an imbalance ... -
Observation of electroweak W+W− pair production in association with two jets in proton-proton collisions at √s = 13 TeV
(2023) [Artículo de periódico]An observation is reported of the electroweak production of a W+W− pair in association with two jets, with both W bosons decaying leptonically. The data sample corresponds to an integrated luminosity of 138 fb−1 of ... -
Observation of forward neutron multiplicity dependence of dimuon acoplanarity in ultraperipheral Pb-Pb collisions at √snn= 5.02 TeV
(2021) [Artículo de periódico]The first measurement of the dependence of γγ→μ+μ− production on the multiplicity of neutrons emitted very close to the beam direction in ultraperipheral heavy ion collisions is reported. Data for lead-lead interactions ... -
Observation of Higgs boson decay to bottom quarks
(2018) [Artículo de periódico]The observation of the standard model (SM) Higgs boson decay to a pair of bottom quarks is presented. The main contribution to this result is from processes in which Higgs bosons are produced in association with a W or Z ... -
Observation of medium-induced modifications of jet fragmentation in Pb-Pb collisions at √sNN=5.02 TeV using isolated photon-tagged jets
(2018) [Artículo de periódico]Measurements of fragmentation functions for jets associated with an isolated photon are presented for the first time in pp and Pb-Pb collisions. The analysis uses data collected with the CMS detector at the CERN LHC at a ... -
Observation of nuclear modifications in W± boson production in pPb collisions at √snn = 8.16 TeV
(2020) [Artículo de periódico]The production of W± bosons is studied in proton-lead (pPb) collisions at a nucleon-nucleon centre-of-mass energy of √snn = 8.16 TeV. Measurements are performed in the W± → μ±vμ channel using a data sample corresponding ... -
Observation of prompt J/ψ meson elliptic flow in high-multiplicity pPb collisions at √sNN = 8.16 TeV
(2019) [Artículo de periódico]A measurement of the elliptic flow (v2) of prompt J/ ψmesons in high-multiplicity pPbcollisions is reported using data collected by the CMS experiment at a nucleon-nucleon center-of-mass energy √sNN=8.16 TeV. Prompt J/ ... -
Observation of proton-tagged, central (semi)exclusive production of high-mass lepton pairs in pp collisions at 13TeV with the CMS-TOTEM precision proton spectrometer
(2018) [Artículo de periódico]The process pp ! p`+`p( ), with `+` a muon or an electron pair produced at midrapidity with mass larger than 110 GeV, has been observed for the rst time at the LHC in pp collisions at ps = 13TeV. One of the two scattered ... -
Observation of recoil magnetization curves outside the major loop in Co, Fe, and Ni films
(2021) [Artículo de periódico]We report a peculiar magnetization reversal observed in magnetron-sputtered Co, Fe, and Ni films. We found that some recoil (minor) magnetization curves lie entirely and way outside the major loop, a phenomenon referred ...
