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Wyszukujesz frazę "Carvalho, C." wg kryterium: Autor

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    Tytuł:
    A MOSFET only, step-up DC DC micro power converter, for solar energy harvesting applications
    Autorzy:
    Carvalho, C.
    Paulino, N.
    Powiązania:
    https://bibliotekanauki.pl/articles/398057.pdf
    Data publikacji:
    2010
    Wydawca:
    Politechnika Łódzka. Wydział Mikroelektroniki i Informatyki
    Tematy:
    układy CMOS
    elektronika
    energia zbiorów
    układy zarządzania energią
    komórki fotowoltaiczne
    CMOS circuits
    electronics
    energy harvesting
    power management circuits
    PV cells
    Opis:
    In this paper, a step-up micro power converter for solar energy harvesting applications is presented. The circuit is based on a switched-capacitor voltage doubler architecture with MOSFET capacitors, which results in an area approximately eight times smaller than using MiM capacitors for the 0.13 žm CMOS technology. In order to compensate for the loss of efficiency, due to the larger parasitic capacitances, a charge reutilization scheme is employed. The circuit uses a phase controller, designed specifically to work with the series of two PV cells, in order to regulate the output voltage to 1.2 V. Electrical simulations of the circuit, together with an equivalent electrical model of a PV cell, show that the circuit can deliver a power of 536.1 žW to the load, while drawing a power of 799.8 žW from two PV cells stacked in series, corresponding to a maximum efficiency of 67%.
    Źródło:
    International Journal of Microelectronics and Computer Science; 2010, 1, 2; 112-119
    2080-8755
    2353-9607
    Pojawia się w:
    International Journal of Microelectronics and Computer Science
    Dostawca treści:
    Biblioteka Nauki
    Artykuł
    Tytuł:
    Vertebrate tracksites from the Mid-Late Pleistocene eolianites of Portugal: the first record of elefphant tracks in Europe
    Autorzy:
    Carvalho de, C. N.
    Powiązania:
    https://bibliotekanauki.pl/articles/2059278.pdf
    Data publikacji:
    2009
    Wydawca:
    Państwowy Instytut Geologiczny – Państwowy Instytut Badawczy
    Tematy:
    Portugal
    Pleistocene
    Leporidichnites malhaoi n. isp.
    Proboscipeda panfamilia
    elephant footprints
    vertebrate tracks
    Opis:
    This study describes the palaeoichnology of the Malhao Dune Field (Pleistocene), the first report of vertebrate tracksites from all the Cenozoic from Portugal. At least 14 stratigraphic horizons with mammal and bird foot prints and trackways occur, including those of elephants. Concave epirelief footprints produced by elephants show four feet with four toes imprints on each foot and heteropody in a narrow gauge. The presence of three possibly parallel trackways points to gregarious behavior of sub-adults/fe males of Elephas antiquus. The ichnospecies Proboscipeda panfamilia, found in the Malhao and Pessegueiro sectors, represents possibly the first Pleistocene elephant trackways, and record one of the latest occurrences of E. antiquus in Europe. The new ichnogenus and ichnospecies Leporidichnites malhaoi igen. et isp. nov., interpreted as lagomorph tracks, are also described.
    Źródło:
    Geological Quarterly; 2009, 53, 4; 407-414
    1641-7291
    Pojawia się w:
    Geological Quarterly
    Dostawca treści:
    Biblioteka Nauki
    Artykuł
    Tytuł:
    Analysis and glycosyl composition of the exopolysaccharide isolated from submerged fermentation of Ganoderma lucidum CG144
    Autorzy:
    Rubel, R.
    Freire dos Santos, L.
    Stutz Dalla Santa, H.
    Porto de Souza Vandenberghe, L.
    Wojciechowski, A.L.
    de Carvalho, J.C.
    Habu, S.
    Destefanis Vitola, F.M.
    Augur, C.
    Soccol, C.R.
    Powiązania:
    https://bibliotekanauki.pl/articles/56735.pdf
    Data publikacji:
    2014
    Wydawca:
    Polskie Towarzystwo Botaniczne
    Tematy:
    glycosyl composition
    exopolysaccharide
    isolation
    submerged fermentation
    Ganoderma lucidum
    heteroglycan
    herbal medicine
    Chinese medicine
    Opis:
    The evaluation of glycosyl composition is an essential step to guide future research designs applied in bioactivity. In the same way, the unexplored potential bioactivity of exopolysaccharide from Ganoderma lucidum is huge. Therefore, this study investigated the glycosyl composition of the exopolysaccharide isolated from submerged fermentation of G. lucidum to serve as guide for future studies on bioactivity. Glycosyl content and composition were evaluated by combined GC/ MS of the TMS derivatives of the monosaccharide methyl glycosides produced from the sample by acidic methanolysis. Glycosyl composition analysis showed that the dominant carbohydrate component in all samples of exopolysaccharide isolated from submerged fermentation of G. lucidum CG 144 was glucose (58.1%), mannose (26.6%) and galactose (12.5%) which can be referred to as heteroglycan. These results suggest that this Ganoderma exopolysaccharide may be a new immunomodulatory agent.
    Źródło:
    Acta Societatis Botanicorum Poloniae; 2014, 83, 3
    0001-6977
    2083-9480
    Pojawia się w:
    Acta Societatis Botanicorum Poloniae
    Dostawca treści:
    Biblioteka Nauki
    Artykuł
    Tytuł:
    Effect of different doses of post-emergence-applied iodosulfuron on weed control and grain yield of malt barley (Hordeum distichum L.), under Mediterranean conditions
    Autorzy:
    Barros, J.C.
    Calado, J.G.
    Basch, G.
    Carvalho, M.J.
    Powiązania:
    https://bibliotekanauki.pl/articles/66291.pdf
    Data publikacji:
    2016
    Wydawca:
    Polska Akademia Nauk. Czytelnia Czasopism PAN
    Tematy:
    different dose
    herbicide dose
    iodosulphuron
    weed control
    grain yield
    malt barley
    barley
    Hordeum distichum
    six-row barley
    Mediterranean area
    environment condition
    Opis:
    A study was carried out over a two year period (2009/2010 and 2012/2013) on an experimental farm in the Alentejo region (Beja), in southern Portugal where rainfed malt barley (Hordeum distichum L.) is sown at the end of autumn or beginning of winter (November– December). The aim of this experiment was to study the efficiency of the herbicide iodosulfuron-methyl-sodium to control post-emergence broadleaved weeds in this cereal crop. The malt barley crop was established using no-till farming. This technology provides the necessary machine bearing capacity of the soil to assure the post-emergence application of herbicides at two different weed development stages. The herbicide iodosulfuron-methyl-sodium was applied at three doses (5.0, 7.5, and 10.0 g a. i. · ha–1) and at two different broadleaved weed development stages (3 to 4 and 6 to 7 pairs of leaves), that also corresponded to two different crop development stages (beginning of tillering and complete tillering). The results indicated that early herbicide application timing provided a significantly higher efficiency for all the applied herbicide doses, but this better weed control was not reflected in a higher crop grain yield. The lack of a higher crop grain yield was probably due to a crop phytotoxicity of the herbicide, when used at an early application timing.
    Źródło:
    Journal of Plant Protection Research; 2016, 56, 1
    1427-4345
    Pojawia się w:
    Journal of Plant Protection Research
    Dostawca treści:
    Biblioteka Nauki
    Artykuł
    Tytuł:
    rRNA gene expression and location in triticale assayed by silver staining and in situ hybridisation techniques
    Autorzy:
    Lima-Brito, J.
    Carvalho, A.
    Matos, C.
    Heslop-Harriso, Pat
    Guedes-Pinto, H.
    Powiązania:
    https://bibliotekanauki.pl/articles/2198862.pdf
    Data publikacji:
    2005-06-23
    Wydawca:
    Instytut Hodowli i Aklimatyzacji Roślin
    Tematy:
    amphiploids
    in situ hybridisation
    nucleolar dominance
    rDNA
    silver staining
    triticale
    Opis:
    In durum wheat × rye hybrids and the derived amphiploid triticale, AABBRR, the expression of the 1R rRNA genes is largely suppressed. Alloauto-octoploid triticales, AABBRRRR, allows the evaluation if rye NOR inactivation can be overcome by the increase of rye genome number. In the present work, we used silver staining and in situ hybridisation techniques in order to study the nucleolar activity and to localize the rRNA genes in hexaploid and alloauto-octoploid triticales. The use of rye genomic DNA as probe allowed the identification of the rye chromosomes present in both hexaploid and octoploid triticales (14 and 28, respectively). The simultaneous use of the ribosomal sequence enabled the localisation of 18S-25S rDNA on the satellite chromosomes of both triticales. On hexaploid triticale we detected six rDNA sites (four on wheat chromosome pairs 1B and 6B and two on rye chromosome pair 1R), whereas on alloauto-octoploid triticale eight rDNA sites (four on wheat-pairs 1B and 6B and four on rye chromosome pairs 1R) were observed. As expected, the maximum number of active Ag-NORs per metaphase cell was coincident with the maximum number of nucleoli per interphase nucleus confirming that all and only the NORs functionally active during interphase are stained by silver at the next mitotic metaphase. Comparison of the nucleolar activity between hexaploid and octoploid triticales analysed here indicates that the increase in 1R chromosomes from two to four does not change the suppression of rye nucleolar activity. This supports the suggestion that genomic interactions are under strong genetic control.
    Źródło:
    Plant Breeding and Seed Science; 2005, 51; 3-10
    1429-3862
    2083-599X
    Pojawia się w:
    Plant Breeding and Seed Science
    Dostawca treści:
    Biblioteka Nauki
    Artykuł
    Tytuł:
    Acute evaluation of static and dynamic stability of the lumbopelvic region after paravertebral stretching
    Autorzy:
    Coracini, C.A.
    Bortoletto, P.
    Provensi, E.
    Furtuoso, M.V.
    Bertolini, G.R.F.
    Carvalho, A.R.
    Powiązania:
    https://bibliotekanauki.pl/articles/2098560.pdf
    Data publikacji:
    2021
    Wydawca:
    Instytut Medycyny Wsi
    Tematy:
    muscle stretching exercises
    muscle relaxation
    muscle strength
    Opis:
    Introduction and objectives. Since the paravertebral muscles promote dynamic stability to protect the spine, the aim of this study was to verify the association between the acute effect of the stretching support time for the multifidus muscle, and changes in the static and dynamic stability of the lumbopelvic region. Materials and method. A total of 46 volunteers were cross-submitted to three different stretching interventions for the multifidus muscle, being the manutention of stretching time the variation between interventions: 10, 30 and 60 seconds. Each volunteer was submitted to the three interventions with a minimum interval of 7 days and a maximum of 10 days. The order of the interventions was determined by lot. First, pre-intervention values for static and dynamic stability were collected using a biofeedback pressure unit. Subsequently, the sample was forwarded for intervention according to its group; after the completion of the same, data were collected on post-intervention stability. The data were analyzed using SPSS 20.0 software and Chi-square test, with a significance level of 5% (α = 0.05). Results. There was no significant association between the manutention of stretching time and static stability, being χ2(4)=0.812; p=0.949. Similarly, there was no significant association between the stretching support time and dynamic stability, and χ2(4)=1.517; p=0.827. Conclusion. In conclusion, there was no significant association between stretching time of the paravertebral muscles and static and dynamic stability.
    Źródło:
    Journal of Pre-Clinical and Clinical Research; 2019, 13, 4; 150-152
    1898-2395
    Pojawia się w:
    Journal of Pre-Clinical and Clinical Research
    Dostawca treści:
    Biblioteka Nauki
    Artykuł
    Tytuł:
    Preliminary study of hot mix asphalt containing water treatment and sewage sludge
    Autorzy:
    Bastidas-Martínez, J. G.
    Camapum de Carvalho, J.
    Lucena, L. C.
    Farias, M. M.
    Rondón-Quintana, H. A.
    Powiązania:
    https://bibliotekanauki.pl/articles/230585.pdf
    Data publikacji:
    2020
    Wydawca:
    Polska Akademia Nauk. Czytelnia Czasopism PAN
    Tematy:
    osad
    uzdatnianie wody
    osad ściekowy
    wypełniacz mineralny
    mieszanka asfaltowa gorąca
    water treatment
    sludge
    sewage sludge
    mineral filler
    hot mix asphalt
    Opis:
    Throughout the world, considerable quantities of water treatment sludge (WTS) and sewage sludge (SS) are produced as waste. This study assessed in the laboratory, the possibility to use both waste products when they are incorporated as filler at 1% with relation to the total mass of a hot mix asphalt - HMA. To this end, both waste products were initially reduced to ash through a calcination process. Resistance tests under monotonic load (Marshall and indirect tension tests), and cyclic load (resilient modulus test) were applied on mixes that contained WTS and SS. Besides, moisture damage (modified Lotmman test), and abrasion (Cantabro) resistance were assessed. An analysis of variance (ANOVA) test was performed in order to verify if the results are statically equal or not to those of the control HMA. As a general conclusion, it is reported that both materials show a resistance increase under monotonic load and higher stiffness under cyclic load (cohesion) when they are incorporated into the mix as filler despite the fact that the asphalt content used was less than the control mix. However, some problems are observed associated with moisture damage resistance, and friction wear (adherence).
    Źródło:
    Archives of Civil Engineering; 2020, 66, 1; 225-240
    1230-2945
    Pojawia się w:
    Archives of Civil Engineering
    Dostawca treści:
    Biblioteka Nauki
    Artykuł
    Tytuł:
    Hybrid optimization process applied to tuning of Dynamic Matrix Control: atudy case with DC motor
    Autorzy:
    Carvalho, D. F. de
    Ganzaroli, C. A.
    Couto, L. do
    Dias, R. N. H. M.
    Calixto, W. P.
    Powiązania:
    https://bibliotekanauki.pl/articles/136171.pdf
    Data publikacji:
    2017
    Wydawca:
    EEEIC International Barbara Leonowicz Szabłowska
    Tematy:
    predictive control
    deterministic optimization
    heuristic optimization
    hybrid optimization
    DC motor
    Opis:
    This paper presents study about Dynamic Matrix Control (DMC) controller applied to speed control of DC motor. DMC controller parameters (prediction horizon, control horizon and damping rate of reference) are obtained through optimization methods employing heuristic, deterministic and hybrid strategies. The use of advanced control technique combined with using of optimization methods aims to achieve highly efficient control, reducing the transient state period and variations in steady state. These methods were applied on a simulation model in order to verify which one provides better control results.
    Źródło:
    Transactions on Environment and Electrical Engineering; 2017, 2, 2; 24-30
    2450-5730
    Pojawia się w:
    Transactions on Environment and Electrical Engineering
    Dostawca treści:
    Biblioteka Nauki
    Artykuł
    Tytuł:
    Redox state modulation in rice and its implications for plant development and stress responses
    Autorzy:
    Caverzan, A.
    Ribeiro, C.
    Lazzarotto, F.
    Passaia, G.
    Rosa, S.
    Garighan, J.
    Piovesana, M.
    Carvalho, F.
    Albenisio, J.
    Margis, R.
    Margis-Pinheiro, M.
    Powiązania:
    https://bibliotekanauki.pl/articles/79908.pdf
    Data publikacji:
    2013
    Wydawca:
    Polska Akademia Nauk. Czytelnia Czasopism PAN
    Tematy:
    conference
    reactive oxygen species
    scavenging enzyme
    detoxification
    redox state
    rice
    plant development
    stress response
    plant cell
    biochemical property
    antioxidative enzyme
    ascorbate peroxidase
    glutathione peroxidase
    Źródło:
    BioTechnologia. Journal of Biotechnology Computational Biology and Bionanotechnology; 2013, 94, 2
    0860-7796
    Pojawia się w:
    BioTechnologia. Journal of Biotechnology Computational Biology and Bionanotechnology
    Dostawca treści:
    Biblioteka Nauki
    Artykuł
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