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    Wyświetlanie 1-6 z 6
    Tytuł:
    Critical metrological evaluation of fuel analyses by measurement uncertainty
    Autorzy:
    Oliveira, E. C.
    Powiązania:
    https://bibliotekanauki.pl/articles/220460.pdf
    Data publikacji:
    2011
    Wydawca:
    Polska Akademia Nauk. Czytelnia Czasopism PAN
    Tematy:
    measurement uncertainty
    critical metrological evaluation
    resolution of the volumetric glassware
    blank analytical
    fuel analyses
    Opis:
    It is now widely recognized that the evaluation of the uncertainty associated with a result is an essential part of any quantitative analysis. One way to use the estimation of measurement uncertainty as a metrological critical evaluation tool is the identification of sources of uncertainty on the analytical result, knowing the weak steps, in order to improve the method, when it is necessary. In this work, this methodology is applied to fuel analyses and the results show that the relevant sources of uncertainty are: beyond the repeatability, the resolution of the volumetric glassware and the blank in the analytical curve that are little studied.
    Źródło:
    Metrology and Measurement Systems; 2011, 18, 2; 235-247
    0860-8229
    Pojawia się w:
    Metrology and Measurement Systems
    Dostawca treści:
    Biblioteka Nauki
    Artykuł
    Tytuł:
    Simplified calibration methodology of chromatographs used in custody transfer measurements of natural gas
    Autorzy:
    Oliveira, E. C.
    Powiązania:
    https://bibliotekanauki.pl/articles/220682.pdf
    Data publikacji:
    2012
    Wydawca:
    Polska Akademia Nauk. Czytelnia Czasopism PAN
    Tematy:
    simplified calibration
    gas chromatography
    superior calorific value
    compressibility factor
    natural gas
    Opis:
    The properties, superior calorific value (SCV) and the compressibility factor (z), of 77 natural gas (NG) samples are calculated from two different calibration approaches of gas chromatography, based on ISO 6974-2. The method A uses an analytical curve with seven points that the best adjust is confirmed by Analysis of Variance (ANOVA); it is required when the composition of the natural gas varies. The method B uses a single point calibration, with an allowed tolerance between the calibration gas mixture and sample mole fraction, so it is used to analyze constant natural gas streams. From natural gas composition analyzed by both methods, exceeding the method B allowed tolerance; SCV, z and its uncertainties are calculated and compared. The results show that all samples that comply with Brazilian legislation can be analyzed by method B, because there are no metrological differences in terms of SCV and z, even though the allowed tolerance has been exceeded. This simplified methodology minimizes operator exposure, besides saving about US$ 50,000.00 per chromatograph.
    Źródło:
    Metrology and Measurement Systems; 2012, 19, 2; 405-416
    0860-8229
    Pojawia się w:
    Metrology and Measurement Systems
    Dostawca treści:
    Biblioteka Nauki
    Artykuł
    Tytuł:
    Effectiveness of nanoatrazine in post-emergent control of the tolerant weed Digitaria insularis
    Autorzy:
    Sousa, B.T.
    Pereira, A.E.S.
    Fraceto, L.F.
    De Oliveira, H.C.
    Dalazen, G.
    Powiązania:
    https://bibliotekanauki.pl/articles/2082785.pdf
    Data publikacji:
    2019
    Wydawca:
    Polska Akademia Nauk. Czytelnia Czasopism PAN
    Tematy:
    atrazine
    chemical control
    nanoherbicide
    nanotechnology
    sourgrass
    tolerant
    weed control
    Opis:
    Digitaria insularis (sourgrass) is a monocotyledon weed of difficult control and high in- vasive behavior. Atrazine is widely applied in the Americas to control weeds in maize cul- ture, but its efficiency against D. insularis is limited. The incorporation of atrazine into poly(epsilon-caprolactone) nanocapsules increased the herbicidal activity against suscep- tible weeds; however, the potential of this nanoformulation to control atrazine-tolerant weeds including D. insularis has not yet been tested. Here, we evaluated the post-emergent herbicidal activity of nanoatrazine against D. insularis plants during initial developmental stages. The study was carried out in a greenhouse, using pots filled with clay soil. Plants with two or four expanded leaves were treated with conventional or nanoencapsulated at- razine at 50 or 100% of the recommended dosage (1,000 or 2,000 g ∙ ha −1 ), followed by the evaluation of physiological, growth, and control parameters of the plants. Compared with conventional herbicide, both dosages of nanoatrazine induced greater and faster inhibition of D. insularis photosystem II activity at both developmental stages. Atrazine nanoencap- sulation also improved the control of D. insularis plants, especially in the stage with two expanded leaves. In addition, nanoatrazine led to higher decreases of dry weight of four- leaved plants than atrazine. The use of the half-dosage of nanoatrazine was equally or more efficient in affecting most of the evaluated parameters than the conventional formulation at full dosage. Overall, these results suggest that the nanoencapsulation of atrazine potenti- ated its post-emergent herbicidal activity against D. insularis plants at initial developmental stages, favoring the control of this atrazine-tolerant weed.
    Źródło:
    Journal of Plant Protection Research; 2020, 60, 2; 185-192
    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:
    Analysis of problems and solutions for urban freight transport in Brazilian cities
    Analiza problemów miejskiego transportu towarowego i rozwiązań stosowanych w brazylijskich miastach
    Autorzy:
    de Oliveira, Leise Kelli
    de Oliveira Leite Nascimento, Carla
    Tavares Muzzi Sousa, Luísa
    Costa e Silva, Thaiza Gabrielle
    Goes Pinto, Paulo Henrique
    Moura Pereira, Renata
    Pugas Farias, Lais
    Magalhães Oliveira, Renata Lúcia
    Ferreira, Suellem C.
    Rodrigues de Jesus, Mylena Cristine
    Alves Martins de Souza, Lara
    Powiązania:
    https://bibliotekanauki.pl/articles/1385671.pdf
    Data publikacji:
    2020-07-31
    Wydawca:
    Polskie Wydawnictwo Ekonomiczne
    Tematy:
    urban transport
    freight transport
    retailer
    transport miejski
    transport towarowy
    detalista
    Opis:
    This paper analyzes problems and solutions of urban freight transport in six cities of different sizes and economic profile in the State of Minas Gerais, Brazil. The data were collected in commercial establishments and analyzed through descriptive statistics and using the method of successive intervals. The results obtained reflect the retailers' point of view and indicate that the problems and solutions are different in each city considered in this paper. The availability of unloading zones is the main problem in Betim, Belo Horizonte, Contagem and Itabira. The off-peak delivery is viewed as a solution in Divinópolis, Betim and Itabira. Therefore, with no possibility to determine a single remedy as a broad national solution to urban freight transport, it is instead necessary to investigate the realities of each city so that the policymakers could implement local solutions that reduce the externalities of urban freight transport.
    W artykule przeanalizowano problemy miejskiego transportu towarowego i związane z tym rozwiązania stosowane w sześciu brazylijskich miastach różnej wielkości i o różnym profilu ekonomicznym, zlokalizowanych w stanie Minas Gerais. Dane do badań zbierano w placówkach handlowych i analizowano za pomocą statystyk opisowych oraz metodą kolejnych interwałów. Uzyskane wyniki odzwierciedlają punkt widzenia detalistów i wskazują, że problemy poszczególnych miast nie są jednakowe, podobnie jak potencjalne rozwiązania. Dostępność stref rozładunku jest głównym problemem w miastach Betim, Belo Horizonte, Contagem i Itabira. Natomiast dostawy poza godzinami szczytu są postrzegane jako rozwiązanie w Divinópolis, Betim i Itabira. Nie ma możliwości określenia jednego środka zaradczego jako szerokiego krajowego rozwiązania dla miejskiego transportu towarowego. Zamiast tego konieczne jest zbadanie realiów każdego miasta, aby decydenci mogli wdrożyć lokalne rozwiązania, które złagodzą efekty zewnętrzne miejskiego transportu towarowego.
    Źródło:
    Gospodarka Materiałowa i Logistyka; 2020, 7; 37-44
    1231-2037
    Pojawia się w:
    Gospodarka Materiałowa i Logistyka
    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
      Wyświetlanie 1-6 z 6

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