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Wyszukujesz frazę "Oliveira, V. M." wg kryterium: Autor

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    Wyświetlanie 1-9 z 9
    Tytuł:
    Spin-Orbit Coupling in n-Type PbTe/PbEuTe Quantum Wells
    Autorzy:
    Peres, M. L.
    Chitta, V. A.
    Maude, D. K.
    Oliveira, N. F.
    Rappl, P. H. O.
    Ueta, A. Y.
    Abramof, E.
    Powiązania:
    https://bibliotekanauki.pl/articles/2047927.pdf
    Data publikacji:
    2011-05
    Wydawca:
    Polska Akademia Nauk. Instytut Fizyki PAN
    Tematy:
    72.10.-d
    72.25.Rb
    73.20.Fz
    73.63.Hs
    Opis:
    Magnetoresistance measurements were performed on an n-type PbTe/PbEuTe quantum well and weak antilocalization effects were observed. This indicates the presence of spin-orbit coupling phenomena and we showed that the Rashba effect is the main mechanism responsible for this spin-orbit coupling. Using the model developed by Iordanskii et al., we fitted the experimental curves and obtained the inelastic and spin-orbit scattering times. Thus we could compare the zero field energy spin-splitting predicted by the Rashba theory with the energy spin-splitting obtained from the analysis of the experimental curves. The final result confirms the theoretical prediction of strong Rashba effect on IV-VI based quantum wells.
    Źródło:
    Acta Physica Polonica A; 2011, 119, 5; 602-605
    0587-4246
    1898-794X
    Pojawia się w:
    Acta Physica Polonica A
    Dostawca treści:
    Biblioteka Nauki
    Artykuł
    Tytuł:
    Proposal of heuristic regression method applied in descriptive data analysis: case studies
    Autorzy:
    Gomes, F. A.
    Assis, A. de O.
    Reis, M. R. da C.
    Gomes, V. M.
    Oliveira, S. G. M.
    Araujo, W. R. H. de
    Calixto, W. P.
    Powiązania:
    https://bibliotekanauki.pl/articles/136229.pdf
    Data publikacji:
    2017
    Wydawca:
    EEEIC International Barbara Leonowicz Szabłowska
    Tematy:
    regression
    data analysis
    optimization
    heuristic
    modeling
    Opis:
    The purpose of this paper is to use the hybridized optimization method in order to find mathematical structures for analysis of experimental data. The heuristic optimization method will be hybridized with deterministic optimization method in order to that structures found require not knowledge about data generated experimentally. Five case studies are proposed and discussed to validate the results. The proposed method has viable solution for the analysis of experimental data and extrapolation, with mathematical expression reduced.
    Źródło:
    Transactions on Environment and Electrical Engineering; 2017, 2, 2; 51-57
    2450-5730
    Pojawia się w:
    Transactions on Environment and Electrical Engineering
    Dostawca treści:
    Biblioteka Nauki
    Artykuł
    Tytuł:
    Phytochemical potential of Ficus species for the control of the phytonematode Meloidogyne javanica
    Autorzy:
    Alves, J.R.
    De Assis, J.N.
    Padua, C.C.A.
    Balbino, H.M.
    Lima, L.L.
    De Souza Gouveia, A.
    Vital, C.E.
    Buonicontro, D.S.
    De Freitas, L.G.
    Leite, J.P.V.
    De Oliveira Ramos, H.J.
    Powiązania:
    https://bibliotekanauki.pl/articles/2082765.pdf
    Data publikacji:
    2020
    Wydawca:
    Polska Akademia Nauk. Czytelnia Czasopism PAN
    Tematy:
    gas chromatography/mass spectrometry (GC/MS)
    metabolite profiling
    pest
    control
    phytochemistry
    Opis:
    Root-knot nematodes, genus Meloidogyne, are among the most plant damaging pathogens worldwide. The action of natural products against plant pathogens has been investigated to assess their effectiveness in the control of diseases. Thus, the present study aimed to evaluate the phytochemistry potential of the Ficus species for the control of Meloidogyne javanica. In vitro inhibitory activity assays were performed with crude ethanolic extracts of leaves and branches from 10 Ficus species. Among these, Ficus carica extracts exhibited strong paralysis activity against second stage juveniles (J2) (EC50 = 134.90 μg ∙ ml–1 ), after 72 hours. In addition, high efficacy was observed in egg-hatching inhibition at different embryonic stages. Microscopy analysis revealed severe morphological alterations in the nematode tissues at the J2 stage, as well as immotility of juveniles released from eggs in the presence of F. carica extracts. The efficacy of the treatments for the other species was very low. These differences were supported by the variation in the compound classes, mainly for alkaloids and metabolite profiles by Gas Chromatography/Mass Spectrometry (GC/MS) when F. carica was compared with the other species. The results indicated that F. carica is a promising source for the isolation and identification of molecules capable of acting in the control of M. javanica.
    Źródło:
    Journal of Plant Protection Research; 2020, 60, 2; 193-206
    1427-4345
    Pojawia się w:
    Journal of Plant Protection Research
    Dostawca treści:
    Biblioteka Nauki
    Artykuł
    Tytuł:
    No greens in the forest? Note on the limited consumption of greens in the Amazon
    Autorzy:
    Katz, E.
    Lopez, C.L.
    Fleury, M.
    Miller, R.P.
    Paye, V.
    Dias, T.
    Silva, F.
    Oliveira, Z.
    Moreira, E
    Powiązania:
    https://bibliotekanauki.pl/articles/58954.pdf
    Data publikacji:
    2012
    Wydawca:
    Polskie Towarzystwo Botaniczne
    Źródło:
    Acta Societatis Botanicorum Poloniae; 2012, 81, 4
    0001-6977
    2083-9480
    Pojawia się w:
    Acta Societatis Botanicorum Poloniae
    Dostawca treści:
    Biblioteka Nauki
    Artykuł
    Tytuł:
    Mechanical and thermal properties of commercial multilayer flexible plastic packaging materials irradiated with electron beam
    Autorzy:
    Oliveira, V. M.
    Nogueira, B. R.
    Ortiz, A. V.
    Moura, E. A. B.
    Powiązania:
    https://bibliotekanauki.pl/articles/146772.pdf
    Data publikacji:
    2008
    Wydawca:
    Instytut Chemii i Techniki Jądrowej
    Tematy:
    electron-beam radiation
    multilayer packaging materials
    mechanical properties
    thermal properties
    Opis:
    The effects of electron-beam irradiation on mechanical and thermal properties were studied for two commercial multilayer structures of flexible food packaging. Both the laminated poly(ethylene terephthalate) (PET)/ low-density polyethylene (LDPE) and the coextruded LDPE/polyamide(PA)/LDPE structures were irradiated up to 120 kGy using a 1.5 MeV electron beam accelerator, at room temperature in the presence of air. Mechanical properties showed significant changes (p < 0.05), specially in sealability that was severely affected. Changes in mechanical properties were discussed in relation to the eight day and the six month period after irradiation. In addition, the DSC analysis six months after treatment showed that the fusion enthalpy of the PET/LDPE structure components increase for the LDPE from 10 kGy and decrease for the PET up to 120 kGy (p < 0.05). On the other hand, the LDPE/PA6/ LDPE presented increase in the LDPE and PA up to 120 kGy, except for LDPE at 10 and 15 kGy and PA at 5 kGy doses (p < 0.05). The effects of irradiation were less severe for the LDPE/PA6/LDPE than for the PET/LDPE. The electron-beam irradiation did not show advantageous results that could be of interest for commercial applications for the film industry, but brings important information about the packaging behavior for food producers who may decide to use irradiation as a form of cold pasteurization of their packed products.
    Źródło:
    Nukleonika; 2008, 53, suppl. 2; 141-144
    0029-5922
    1508-5791
    Pojawia się w:
    Nukleonika
    Dostawca treści:
    Biblioteka Nauki
    Artykuł
    Tytuł:
    Forecasting ARIMA models for atmospheric vineyard pathogens in Galicia and Northern Portugal: Botrytis cinerea spores
    Autorzy:
    Fernandez-Gonzalez, M.
    Rodriguez-Rajo, F.J.
    Jato, V.
    Aira, M.J.
    Ribeiro, H.
    Oliveira, M.
    Abreu, I.
    Powiązania:
    https://bibliotekanauki.pl/articles/49793.pdf
    Data publikacji:
    2012
    Wydawca:
    Instytut Medycyny Wsi
    Opis:
    Botrytis cinerea is the cause of the most common disease in the Galician and Portuguese vineyards. Knowledge of the spore levels in the atmosphere of vineyards is a tool for forecasting models of the concentration of spores in order to adjust the phytosanitary treatments to real risk infection periods. The presented study was conducted in two vineyards, one located in Cenlle (Spain) and other in Amares (Portugal), from 2005-2007. A volumetric trap, model Lanzoni VPPS-2000, was used for the aerobiological study. Phenological observations were conducted on 20 vines of three grape varieties in Cenlle (Treixadura, Godello and Loureira) and in Amares (Trajadura, Loureiro and Pedernã), by using the BBCH scale. The highest total spore concentrations during the grapevine cycle were recorded in 2007 in both locations (Cenlle:16,145 spores; Amares:1,858 spores), and the lowest, in 2005 in Cenlle (1,700 spores) and in Amares (800 spores) in 2006. In Cenlle, the best adjusted model was an ARIMA (0,2,2), including the relative humidity four days earlier, while in Amares there was an ARIMA (1,2,3), considering the relative humidity three days earlier and rainfall two days earlier. The t-test showed no significant difference between observed and predicted data by the model.
    Źródło:
    Annals of Agricultural and Environmental Medicine; 2012, 19, 2
    1232-1966
    Pojawia się w:
    Annals of Agricultural and Environmental Medicine
    Dostawca treści:
    Biblioteka Nauki
    Artykuł
    Tytuł:
    Facies architecture of the fluvial Missão Velha Formation (Late Jurassic-Early Cretaceous), Araripe Basin, Northeast Brazil : paleogeographic and tectonic implications
    Autorzy:
    Fambrini, G. L.
    Neumann, V. H. M. L.
    Menezes-Filho, J. A. B
    da Silva-Filho, W. F.
    de Oliveira, É. V.
    Powiązania:
    https://bibliotekanauki.pl/articles/139001.pdf
    Data publikacji:
    2017
    Wydawca:
    Polska Akademia Nauk. Czytelnia Czasopism PAN
    Tematy:
    Araripe Basin
    Missão Velha Formation
    fluvial facies
    architectural element
    rift basins
    basen Araripe
    Missão Velha
    facje rzeczne
    element architektoniczny
    rów tektoniczny
    Opis:
    Sedimentological analysis of the Missão Velha Formation (Araripe Basin, northeast Brazil) is the aim of this paper through detailed facies analysis, architectural elements, depositional systems and paleocurrent data. The main facies recognized were: (i) coarse-grained conglomeratic sandstones, locally pebbly conglomerates, with abundant silicified fossil trunks and several large-to-medium trough cross-stratifications and predominantly lenticular geometry; (ii) lenticular coarse-to-medium sandstones with some granules, abundant silicified fossil wood, and large-to-medium trough cross-stratifications, cut-and fill features and mud drapes on the foresets of cross-strata, (iii) poorly sorted medium-grained sandstones with sparse pebbles and with horizontal stratification, (iv) fine to very fine silty sandstones, laminated, interlayered with (v) decimetric muddy layers with horizontal lamination and climbing-ripple cross-lamination. Nine architectural elements were recognized: CH: Channels, GB: Gravel bars and bed forms, SB: Sand bars and bedforms, SB (p): sand bedform with planar cross-stratification, OF: Overbank flow, DA: Downstream-accretion macroforms, LS: Laminated sandsheet, LA: Lateral-accretion macroforms and FF: Floodplain fines. The lithofacies types and facies associations were interpreted as having been generated by alluvial systems characterized by (i) high energy perennial braided river systems and (ii) ephemeral river systems. Aeolian sand dunes and sand sheets generated by the reworking of braided alluvial deposits can also occur. The paleocurrent measurements show a main dispersion pattern to S, SE and SW, and another to NE/E. These features imply a paleodrainage flowing into the basins of the Recôncavo-Tucano-Jatobá.
    Źródło:
    Acta Geologica Polonica; 2017, 67, 4; 515-545
    0001-5709
    Pojawia się w:
    Acta Geologica Polonica
    Dostawca treści:
    Biblioteka Nauki
    Artykuł
    Tytuł:
    Charge-Ordering and Magnetoelastic Coupling Effects on the Magnetocaloric Properties of Manganites
    Autorzy:
    Reis, M. S.
    Gomes, A. M.
    Araújo, J. P.
    Tavares, P. B.
    Amaral, J. S.
    Oliveira, I. S.
    Amaral, V. S.
    Powiązania:
    https://bibliotekanauki.pl/articles/2037124.pdf
    Data publikacji:
    2004
    Wydawca:
    Polska Akademia Nauk. Instytut Fizyki PAN
    Tematy:
    75.30.Sg
    75.30.Kz
    75.80.+q
    Opis:
    A study of the magnetocaloric properties of La$\text{}_{1-x-y}$Y$\text{}_{y}$Ca$\text{}_{x}$MnO$\text{}_{3}$, La$\text{}_{1-x}$Cd$\text{}_{x}$MnO$\text{}_{3}$, and Pr$\text{}_{1-x}$Ca$\text{}_{x}$MnO$\text{}_{3}$ manganites with ferromagnetic and charge-ordered states is presented. The ferromagnetic lanthanum manganites show a negative entropy change peakΔ S under the application of a magnetic field at the Curie temperature. However, the magnetoelastic coupling effects lead to a first-order paramagnetic-ferromagn etic transition and an increasedΔ S compared to simple ferromagnets. This effect is analyzed in the framework of the Landau theory of phase transitions which shows a comparable influence of the magnetoelastic couplings and the ordinary magnetic ordering effect. The Pr$\text{}_{1-x}$Ca$\text{}_{x}$MnO $\text{}_{3}$ system shows a rich electric and magnetic phase diagram, with a ferromagnetic insulator phase for 0.15
    Źródło:
    Acta Physica Polonica A; 2004, 105, 1-2; 163-171
    0587-4246
    1898-794X
    Pojawia się w:
    Acta Physica Polonica A
    Dostawca treści:
    Biblioteka Nauki
    Artykuł
      Wyświetlanie 1-9 z 9

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