Navegação Ciências Exatas e da Terra por Título
Resultados 2687-2706 de 6034
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Investigation into the event-activity dependence of ϒ(nS) relative production in proton-proton collisions at √s= 7 TeV
(2020) [Artigo de periódico]The ratios of the production cross sections between the excited ϒ(2S) and ϒ(3S) mesons and the ϒ(1S) ground state, detected via their decay into two muons, are studied as a function of the number of charged particles in ... -
Investigation of freshwater sponges spicules deposits in a karstic lake in Brazil
(2016) [Artigo de periódico]The environmental conditions which contributed to the formation of the notorious quaternary deposits of freshwater sponge spicules in karstic lentic environments in Brazil have been subject of some speculation. No investigation ... -
Investigation of indirect structural and chemical parameters of GeSi nanoparticles in a silica matrix by combined synchrotron radiation techniques
(2012) [Artigo de periódico]The formation of GeSi nanoparticles on an SiO2 matrix is studied here by synchrotron-based techniques. The shape, average diameter and size dispersion were obtained from grazing-incidence small-angle X-ray scattering data. ... -
Investigation of K + K − interactions via femtoscopy in Pb-Pb collisions at √sNN = 2.76 TeV at the CERN Large Hadron Collider
(2023) [Artigo de periódico]Femtoscopic correlations of nonidentical charged kaons (K+K−) are studied in Pb-Pb collisions at a center-ofmass energy per nucleon-nucleon collision √sNN = 2.76 TeV by ALICE at the CERN Large Hadron Collider. One-dimensional ... -
Investigation of medium and heavy nuclei by quasi-free-proton scattering
(1960) [Artigo de periódico] -
Investigation of nuclear structure by quasi-free scattering with polarized protons
(1981) [Artigo de periódico]Quasi-free scattering with polarized protons can be a sensitive method to probe certain spin correlations in the nuclear wave function. This is demonstrated by the comparison of the effective polarizations following from ... -
Investigation of potential biomarkers for the early diagnosis of cellular stability after the exposure of agricultural workers to pesticides
(2016) [Artigo de periódico]Agricultural workers involved in the harvest of tobacco crops are regularly exposed to large quantities of pesticides. In order to determine how this exposure to pesticides induces genetic alterations in these workers, ... -
Investigation of scalar and fermion dark matter in mono-photon production at high-energy colliders
(2024) [Artigo de periódico]Many theories about dark matter have emerged due to its strong theoretical appeal in explaining astrophysical phenomena. However, experimental and theoretical particle physics have yet not provided evidence that dark matter ... -
Investigation of the interaction of 2-(2’-Hydroxyphenyl)-benzoxazoles and their derivatives with B-DNA by docking and molecular dynamics
(2015) [Artigo de periódico]In this work we carried out a study covering conformational analysis, docking calculations and molecular dynamics (MD) simulations of six excited state intramolecular proton transfer (ESIPT)-fluorescent 2-(2’-hydroxyphen ... -
Investigation of the p–Σ0 interaction via femtoscopy in pp collisions
(2020) [Artigo de periódico]This Letter presents the first direct investigation of the p–Σ0 interaction, using the femtoscopy technique in high-multiplicity pp collisions at √s = 13 TeV measured by the ALICE detector. The Σ0 is reconstructed via the ... -
Investigations of anisotropic flow using multiparticle azimuthal correlations in pp, p-Pb, Xe-Xe, and Pb-Pb collisions at the LHC
(2019) [Artigo de periódico]Measurements of anisotropic flow coefficients (vn) and their cross-correlations using two- and multiparticle cumulant methods are reported in collisions of pp at √s=13 TeV, p−Pb at a center-of-mass energy per nucleon pair ... -
Investindo na formação de professores de ciências do ensino fundamental : uma experiência em física térmica
(2010) [Artigo de periódico]O entendimento de conceitos básicos de Física é um aspecto fundamental para a formação intelectual de cidadãos de qualquer sociedade moderna. Como parte da alfabetização científica dos indivíduos, iniciada no ensino ... -
In vitro antimicrobial activity of a new series of 1,4-naphthoquinones
(2002) [Artigo de periódico]The antibacterial activity of a series of 1,4-naphthoquinones was demonstrated. Disk diffusion tests were carried out against several Gram-positive and Gram-negative bacteria. The compound 5-amino- 8-hydroxy-1,4-naphthoquinone ... -
Ion-acoustic cnoidal waves in a quantum plasma
(2014) [Artigo de periódico]Nonlinear ion-acoustic cnoidal wave structures are studied in an unmagnetized quantum plasma. Using the reductive perturbation method, a Korteweg-de Vries equation is derived for appropriate boundary conditions and nonlinear ... -
Ion-acoustic envelope modes in a degenerate relativistic electron-ion plasma
(2016) [Artigo de periódico]A self-consistent relativistic two-fluid model is proposed for one-dimensional electron-ion plasma dynamics. A multiple scales perturbation technique is employed, leading to an evolution equation for the wave envelope, in ... -
Ion acoustic solitons in dense magnetized plasmas with nonrelativistic degenerate electrons and positrons
(2014) [Artigo de periódico]The propagation of electrostatic waves in a densemagnetized electron–positron–ion (EPI) plasma with nonrelativistic and ultrarelativistic degenerate electrons and positrons is investigated. The linear dispersion relation ... -
Ion beam analyses in titanium nitride technology
(1993) [Artigo de periódico]TI e technology of hard coatings based on stoichiometric titanium nitride thin films has been inovated since the past few years in order to fulfill the demands for better performance and lower processing cost put by the ... -
Ion beam analysis (IBA) and instrumental neutron activation analysis (INAA) for forensic characterisation of authentic Viagra® and of sildenafil-based illegal products
(2021) [Artigo de periódico]Illegal trafficking of pharmaceutical products by criminal organisations is a global threat for public health. Drugs for erectile dysfunction such as phosphodiesterase type 5 inhibitors are the most commonly counterfeited ... -
Ion-beam–plasma interaction effects on electrostatic solitary wave propagation in ultradense relativistic quantum plasmas
(2017) [Artigo de periódico]Understanding the transport properties of charged particle beams is important not only from a fundamental point of view but also due to its relevance in a variety of applications. A theoretical model is established in this ... -
Ion-beam/plasma modes in ultradense relativistic quantum plasmas : dispersion characteristics and beam-driven instability
(2017) [Artigo de periódico]A relativistic quantum-hydrodynamic plasma model is proposed, to model the propagation of electrostatic waves in an ultradense quantum electron-ion plasma in the presence of an ion beam. A dispersion relation is derived ...