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    Tytuł:
    Unified power quality conditioner in a grid-connected photovoltaic system
    Autorzy:
    Cavalcanti, M. C.
    Azevedo, G. M.
    Amaral, B. A.
    Neves, F. A.
    Powiązania:
    https://bibliotekanauki.pl/articles/262717.pdf
    Data publikacji:
    2006
    Wydawca:
    Akademia Górniczo-Hutnicza im. Stanisława Staszica w Krakowie
    Tematy:
    control systems
    converters
    energy conversion
    photovoltaic power systems
    power quality
    solar energy
    Opis:
    This paper presents a system that provides photovoltaic generation as well as the functions of a unified power quality conditioner. The system can be controlled for current harmonics and reactive power compensation simultaneously by using a converter operating as active shunt filter. The other converter is used as active series filter and it compensates voltage harmonics or voltage sags and swells. Using only an inverter in photovoltaic energy conversion process, the system presents increased efficiency when compared to the conventional systems. The synchronous reference frame method is used to control the three-phase converters. Simulation results demonstrate the good performance of the proposed configuration. Experimental results corresponding to the operation of the series filter as voltage sag compensator are presented.
    Źródło:
    Electrical Power Quality and Utilisation. Journal; 2006, 12, 2; 59-69
    1896-4672
    Pojawia się w:
    Electrical Power Quality and Utilisation. Journal
    Dostawca treści:
    Biblioteka Nauki
    Artykuł
    Tytuł:
    Styrene oxidation by copper(II) complexes salen-type encapsulated into NaY zeolite
    Katalityczne utlenianie styrenu w obecności kompleksów miedzi(II) typu salen osadzonych na zeolicie NaY
    Autorzy:
    Kuźniarska-Biernacka, I.
    Carvalho, M. A.
    Correia Neves, I.
    Fonseca, A. M.
    Lisińska-Czekaj, A.
    Czekaj, D.
    Powiązania:
    https://bibliotekanauki.pl/articles/352679.pdf
    Data publikacji:
    2013
    Wydawca:
    Polska Akademia Nauk. Czytelnia Czasopism PAN
    Tematy:
    copper(II) complexes
    Schiff base
    NaY zeolite
    kompleksy miedzi(II)
    zasada Schiffa
    zeolit NaY
    Opis:
    The copper(II) complex with a Schiff-base salen-type ligand has been encapsulated in the nanopores of a NaY zeolite by using two different methodologies, the flexible ligand and in situ complex preparation methods. The encapsulated and non-encapsulated copper(II) complexes were screened as catalysts for styrene oxidation by using TBHP as the oxygen source in acetonitrile solvent. Under the optimized conditions, the catalysts exhibited moderate activity with higher selectivity to benzaldehyde. Both heterogeneous catalysts were found to be reusable after the catalytic cycle, but with some loss of activity.
    Osadzenie kompleksu miedzi(II) z zasadą Schiffa typu salen na zeolicie typu NaY zostało przepowadzone za pomocą dwóch metod „flexible ligand" i „in situ”. Katalityczne właściwości otrzymanego kompleksu oraz jego heterogenizowanych analogów badano w reakcji utleniania styrenu w obecności TBHP. Jako rozpuszczalnik stosowano acetonitryl. Testowane katalizatory wykazują średnią aktywność katalityczną z tendencją wytwarzania aldehy du benzoesowego. Oba heterogenizowane katalizatory mogą być wykorzystywane ponownie bez utraty aktywności katalitycznych.
    Źródło:
    Archives of Metallurgy and Materials; 2013, 58, 4; 1291-1294
    1733-3490
    Pojawia się w:
    Archives of Metallurgy and Materials
    Dostawca treści:
    Biblioteka Nauki
    Artykuł
    Tytuł:
    Styrene epoxidation over heterogeneous manganese (III) complexes
    Autorzy:
    Kuźniarska-Biernacka, I.
    Lisinska-Czekaj, A.
    Czekaj, D.
    Alves, M. J.
    Fonseca, A. M.
    Neves, I. C.
    Powiązania:
    https://bibliotekanauki.pl/articles/958207.pdf
    Data publikacji:
    2016
    Wydawca:
    Polska Akademia Nauk. Czytelnia Czasopism PAN
    Tematy:
    styrene epoxidation
    heterogeneous manganes
    Opis:
    The manganes (III) complex functionalised with 2,3-dihydropyridazine has been encapsulated in the supercages of the NaY zeolite using two different procedures, flexible ligand and in situ complex. The parent zeolite and the encapsulated manganese (LTI) complexes were screened as catalysts for styrene oxidation by using t-BOOH as the oxygen source in acetonitrile. Under the optimized conditions, the catalysts exhibited moderate activity with high selectivity to benzaldehyde.
    Źródło:
    Archives of Metallurgy and Materials; 2016, 61, 3; 1477-1482
    1733-3490
    Pojawia się w:
    Archives of Metallurgy and Materials
    Dostawca treści:
    Biblioteka Nauki
    Artykuł
    Tytuł:
    Photobiomodulation with cluster does not present superior results to placebo in young people with chronic non-specific lumbar pain
    Autorzy:
    Bohnenberger Escanes, I.B.
    Cordeiro Baierle, I.
    de Assis, T.
    Neves, M.
    Flores, L.J.F.
    Bertolini, G.R.F.
    Powiązania:
    https://bibliotekanauki.pl/articles/2098208.pdf
    Data publikacji:
    2020
    Wydawca:
    Instytut Medycyny Wsi
    Tematy:
    lumbar section
    non-specific dysfunction
    human morbidity
    photobiomodulation
    laser therapy
    young patient
    Opis:
    Introduction and objective. Since the characteristic of chronic non-specific lumbar dysfunction presents a high prevalence and morbidity, and that there are still conflicting results with the use of photobiomodulation, the aim of this study was to analyze the effect of photobiomodulation application in patients with chronic non-specific lombalgy. Materials and method. A quantitative, experimental, randomized study composed of 21 volunteers randomly separated into two groups: 1) the intervention group (IG), who were given an application of photobiomodulation (LED (617nm ±10%, 1,500 mW) and low-level laser therapy (830nm, 150 mW, beam area 12.57mm), combined energy of 8.4 J per area for one minute in four different locations: in regions of greatest pain referred to palpation, on a bilateral basis, area of the applicator – 23,8 cm2). 2) the control group (CG), in which the device remained switched-off during therapy. All subjects were evaluated by McGill and Roland Morris questionnaires before and at the end of 6 interventions (3 weeks). Results. For both McGill and Roland Morris total pain rates, there was no inter-group interaction or interaction between evaluation and group (p>0.05). In the comparison between evaluations (before and after), there was a significant difference (p<0.001). Conclusions. The use of photobiomodulation in these parameters in young patients with chronic non-specific lombalgy, was not more effective than the placebo for the relief of painful symptoms. Nor did it promote a decrease in the repercussion of lombalgy in the performance of daily activities.
    Źródło:
    Journal of Pre-Clinical and Clinical Research; 2020, 14, 4; 107-110
    1898-2395
    Pojawia się w:
    Journal of Pre-Clinical and Clinical Research
    Dostawca treści:
    Biblioteka Nauki
    Artykuł
    Tytuł:
    Parasites community of Astronotus crassipinnis (Cichlidae), a fish from the Brazilian Amazon
    Autorzy:
    Santos, G.G.
    Oliveira, M.S.B.
    Neves, L.R.
    Tavares-Dias, M.
    Powiązania:
    https://bibliotekanauki.pl/articles/972319.pdf
    Data publikacji:
    2018
    Wydawca:
    Polskie Towarzystwo Parazytologiczne
    Tematy:
    aggregation
    parasites
    Amazon
    Astronotus crassipinnis
    Cichlidae
    Opis:
    We provide the first study on the diversity and community of parasites in Astronotus crassipinnis from the lower Amazon River, in Brazil. Of 35 hosts examined, 100% were infected with one or more species of parasites, such as Gussevia asota, Gussevia astronoti, Gussevia rogersi, Posthodiplostomum sp., Contracaecum sp., Gorytocephalus sp. and Dolops longicauda. Gussevia asota, G. astronoti and G. rogersi were dominant, and, in total, 9788 parasites were collected. The richness of parasite species (4.9±0.7), Brillouin diversity (0.46±0.28) and evenness (0.29±0.17) were low. Parasites had aggregated dispersion, parasitism did not affect the host condition factor, and host size did not influence abundance, species richness and parasite diversity. The parasitic fauna was characterized by the presence of few species of parasites with high prevalence and low abundance, specifically the endoparasites, besides dominance of ectoparasites. The presence of endoparasites indicates that the diet of A. crassipinnis consists mostly of mollusks and microcrustaceans. This fish species is an intermediate host for Posthodiplostomum sp., Contracaecum sp. and Gorytocephalus sp., parasites found in larval stage. Finally, the behavior and availability of infective stages, which are intermediate hosts for endoparasites, were factors structuring the communities of endoparasites.
    Źródło:
    Annals of Parasitology; 2018, 64, 2; 121-128
    0043-5163
    Pojawia się w:
    Annals of Parasitology
    Dostawca treści:
    Biblioteka Nauki
    Artykuł
    Tytuł:
    Isospora mimusi n. sp. (Apicomplexa: Eimeriidae) from the Tropical Mockingbird Mimus gilvus in South America
    Autorzy:
    Coelko, Cleide D.
    Berto, Bruno P.
    Neves, Daniel M.
    de Oliveira, Vinícius M.
    Flausino, Walter
    Lopes, Carlos W. G.
    Powiązania:
    https://bibliotekanauki.pl/articles/763581.pdf
    Data publikacji:
    2011
    Wydawca:
    Uniwersytet Jagielloński. Wydawnictwo Uniwersytetu Jagiellońskiego
    Tematy:
    Isospora mimusi, oocysts, coccidiosis, Passeriformes, Mimidae, illegal trade, CETAS, Seropédica, Brazil.eus
    Opis:
    This current study reports a new isosporoid (Apicomplexa: Eimeriidae) species parasitizing tropical mockingbirds Mimus gilvus recovered from illegal trade in Brazil. Isospora mimusi n. sp. oocysts are spherical to sub-spherical, 20.6 × 19.6 μm, with smooth, bilayered wall, ~1.2 μm. Micropyle, oocyst residuum and polar granule are absent. Sporocysts are ovoidal, 13.4 × 9.8 μm. Stieda and substieda bodies are present. Sporocyst residuum composed of diffuse granules of various sizes, sporozoites have one refractile body.
    Źródło:
    Acta Protozoologica; 2011, 50, 2
    1689-0027
    Pojawia się w:
    Acta Protozoologica
    Dostawca treści:
    Biblioteka Nauki
    Artykuł
    Tytuł:
    Implementation of a digital signal processor-controlled shunt active filter
    Autorzy:
    Limongi, L. R.
    Cavalcanti, M. C.
    Neves, F.
    Azevedo, G. M.
    Powiązania:
    https://bibliotekanauki.pl/articles/262731.pdf
    Data publikacji:
    2006
    Wydawca:
    Akademia Górniczo-Hutnicza im. Stanisława Staszica w Krakowie
    Tematy:
    active filters
    current control
    power quality
    Opis:
    This paper presents the implementation of an active filter configuration for harmonic compensation. The system can be controlled for current harmonics and reactive power compensations simultaneously by using a converter operating as active shunt filter. A synchronous reference frame based controller is compared to an instantaneous reactive power based controller. The synchronous reference frame method is chosen to control the converter due to the better performance when the supply voltage is distorted. A shunt active filter system has been designed and built to meet IEEE 519 recommended harmonic standards. Simulation demonstrates the good performance of the active filter configuration. Experimental results, corresponding to the operation of the digital signal processor-controlled shunt active filter are also presented.
    Źródło:
    Electrical Power Quality and Utilisation. Journal; 2006, 12, 2; 5-14
    1896-4672
    Pojawia się w:
    Electrical Power Quality and Utilisation. Journal
    Dostawca treści:
    Biblioteka Nauki
    Artykuł
    Tytuł:
    Evaluation of acute low back pain in women after treatment with interferential current
    Autorzy:
    Serafim, A.
    Rabel, J.
    Neves, M.
    Da Silva, T.S.
    Bertolini, G.R.F.
    Powiązania:
    https://bibliotekanauki.pl/articles/3294.pdf
    Data publikacji:
    2019
    Wydawca:
    Instytut Medycyny Wsi
    Źródło:
    Journal of Pre-Clinical and Clinical Research; 2019, 13, 2
    1898-2395
    Pojawia się w:
    Journal of Pre-Clinical and Clinical Research
    Dostawca treści:
    Biblioteka Nauki
    Artykuł
      Wyświetlanie 1-8 z 8

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