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    Wyświetlanie 1-35 z 35
    Tytuł:
    From palaeosols to carbonate mounds: facies and environments of the middle Frasnian platform in Belgium
    Autorzy:
    Silva da, A. C.
    Boulvain, F.
    Powiązania:
    https://bibliotekanauki.pl/articles/2058840.pdf
    Data publikacji:
    2004
    Wydawca:
    Państwowy Instytut Geologiczny – Państwowy Instytut Badawczy
    Tematy:
    Belgium
    middle Frasnian
    carbonate platform
    palaeogeography
    facies
    carbonate mounds
    Opis:
    This paper provides a synthetic sedimentological overview of themiddle Frasnian carbonate platform of Belgium and associated carbonate mounds. Carbonate mounds started usually in a relatively deep, quiet subphotic environment with a crinoid-coral-sponge assemblage, then reached the fair-weather wave base and the euphotic zone with an algal-microbial facies. The upper parts of themounds are characterised by lateral facies differentiation with the algal-microbial facies protecting a central sedimentation area with a dendroid stromatoporoids facies and fenestral limestone. The lateral facies reflect different kinds of input of reworked mound material in the proximal area, from transported fine-grained sediment to coarse-grained fossil debris. On the platform, environments range from the outer zone (crinoidal facies) to stromatoporoid-dominated biostromes and to the lagoonal area of the inner zones (subtidal facies with Amphipora floatstone, algal packstone, intertidal mudstone and laminated peloidal packstone and palaeosols). These facies are stacked in metre-scale shallowing-upward cycles. The larger scale sequential organisation corresponds to transgressions and regressions, whose cycles are responsible for differentiating a lower open-marine biostrome dominated unit from an upper lagoonal unit. The last regression- transgression cycle, responsible for the platform-scale development of lagoonal facies, can be correlated with an atoll-stage evolution of the carbonate mounds belonging to the Lion Member.
    Źródło:
    Geological Quarterly; 2004, 48, 3; 253--266
    1641-7291
    Pojawia się w:
    Geological Quarterly
    Dostawca treści:
    Biblioteka Nauki
    Artykuł
    Tytuł:
    A new report on Hesperomyces coleomegillae (Ascomycota, Laboulbeniales) parasitism of Coleomegilla maculata (Coleoptera, Coccinellidae) in Brazil
    Autorzy:
    Inacio, C.A.
    de Paulo, H.H.
    Almeida, J.D.
    Rembinski, J.
    Menezes, E.L.A.
    Silva, A.C.
    Powiązania:
    https://bibliotekanauki.pl/articles/2196347.pdf
    Data publikacji:
    2019-04-18
    Wydawca:
    Polskie Towarzystwo Botaniczne
    Tematy:
    Hesperomyces
    Ascomycota
    Laboulbeniales
    Coleomegilla maculata
    Coleoptera
    Coccinellidae
    parasitism
    host-parasite interaction
    tropical fungi
    Brazil
    Opis:
    For the first time, the genus Hesperomyces has been reported to infect Coleomegilla maculata in laboratory mass rearing in Brazil. Thalli were found growing on several parts of this ladybird species, including the head, elytra, legs, and abdomen. Infested adults died after 60 days.
    Źródło:
    Acta Mycologica; 2019, 54, 1; 1117
    0001-625X
    2353-074X
    Pojawia się w:
    Acta Mycologica
    Dostawca treści:
    Biblioteka Nauki
    Artykuł
    Tytuł:
    High speed machining of aluminium gear box without temperature stabilization
    Szybka obróbka aluminiowych obudów skrzyń biegów bez stabilizacji temperaturowej
    Autorzy:
    Silva, A.
    Mateus, C.
    Węgrzyn, T.
    Miros, M.
    Powiązania:
    https://bibliotekanauki.pl/articles/374817.pdf
    Data publikacji:
    2010
    Wydawca:
    Politechnika Śląska. Wydawnictwo Politechniki Śląskiej
    Tematy:
    stop aluminium
    stabilność wymiarowa
    obróbka szybkościowa
    aluminium alloy
    dimensional stability
    high speed machining
    Opis:
    At the present time both clutch and mechanism housings, which are the main components from automotive gear boxes, are made of special aluminium alloys. These alloys are extremely light when compared with steel, making them a perfect choice to mitigate the cars weight and machining costs. Nonetheless they possess a high thermal expansion coefficient, which can be considered a major disadvantage since it makes necessary to pay extraordinary attention to dimensional variations during the production cycle due to temperature deviations. High speed machining of precision components made of aluminium requests thus their temperature to become previously stable. This procedure is the only way to force dimensions to stay inside its tolerance intervals. The main purpose of the present work was to assess the possibility to avoid the use of special ovens to make the clutch housing temperature become stable prior to machining. The dimensional stabilization of 40 sample parts, pre-heated at three temperature levels, was accomplished through the use of this system. The achieved results were made possible by analysing the part's temperature at the machine's entrance, the machine's interior temperature, 35 measured dimensions and their tolerance intervals as well as the average temperature deviations of each of the five considered batches. By analysing the obtained results in detail it was possible to determine which dimensions show high sensitiveness to temperature (high correlation between dimension's variation and temperature). Among these dimensions we can point out the ones related with depth, since they display the highest deviations due to temperature. Being a work with practical application it was possible to confirm the benefit of using this methodology by achieving significant enhancements on production efficiency, energy savings and reduction on maintenance costs, through the application of small adjustments to the machining sequence and by adopting a systematic tuning of certain dimensions.
    Obecnie zarówno sprzęgło, jak i mechanizm przekładniowy, które są głównymi komponentami skrzyń biegów, umieszczone są w obudowie wykonanej ze specjalnych stopów aluminium. Stopy te są znacznie lżejsze w porównaniu ze stalą, powoduje to że są one doskonałym wyborem, by zmniejszyć wagę samochodów oraz 58 A.P. Silva, C.S. Mateus,, T. Wegrzyn, M. Miros koszty produkcji. Niemniej jednak materiały te posiadają wysoki współczynnik rozszerzalności cieplnej, który może zostać uznany ich główna wadą. Powoduje to że koniecznym stało się zwracanie dużej uwagi na utrzymanie wariantów wymiarowych podczas obróbki charakteryzującej się zmianami temperatury. Wysoka szybkość obróbki precyzyjnych komponentów wykonanych z aluminium spowodowała konieczność wcześniejszego ich podgrzewania w celu uniknięcia zmian temperatury podczas obróbki. Takie zabieg jest jedynym sposobem, aby zachować odpowiednią tolerancję wymiarową. Głównym celem niniejszej pracy była ocena możliwości, uniknięcia użycia specjalnych pieców wstępnie podgrzewających elementy przed obróbką w celu zapewnienia stabilizacji termicznej podczas obróbki. W pracy przeanalizowano możliwość zastosowania specjalnych komór z natryskowym systemem chłodzenia olejowego. Analiza osiągniętych wyników była możliwa poprzez pomiar temperatur na wejściu do maszyny oraz w jej wnętrzu. Pomiary przeprowadzono dla 35 próbek, których wymiary oraz tolerancję mierzono. Szczegółowa analiza pozwoliła stwierdzić, które z wymiarów wykazują się dużą wrażliwością na zmiany temperatury (wysoka korelacja między odmianą wymiaru i temperaturą). Pomiędzy wytypowanymi wymiarami najwrażliwszymi okazały się wymiary związane z głębokością. Uzyskane wyniki pozwoliły potwierdzić korzyści z używania opracowanej metody. Metoda ta pozwala na znaczne oszczędności energii oraz zwiększenie efektywności produkcji.
    Źródło:
    Transport Problems; 2010, 5, 3; 57-66
    1896-0596
    2300-861X
    Pojawia się w:
    Transport Problems
    Dostawca treści:
    Biblioteka Nauki
    Artykuł
    Tytuł:
    Anthropometric indicators of obesity in policemen: A systematic review of observational studies
    Autorzy:
    Da Silva, Franciele C.
    Hernandez, Salma S.
    Gonçalves, Elizandra
    Arancibia, Beatriz A.
    Da Silva Castro, Thiago L.
    Da Silva, Rudney
    Powiązania:
    https://bibliotekanauki.pl/articles/2178909.pdf
    Data publikacji:
    2014-12-01
    Wydawca:
    Instytut Medycyny Pracy im. prof. dra Jerzego Nofera w Łodzi
    Tematy:
    obesity
    police
    systematic review
    observational study
    Opis:
    The aim of this paper was to summarize scientific literature on obesity in policemen through a systematic review of observational studies. For this purpose the following electronic databases were selected: Medline by Pubmed, CINAHL, and Scopus; and a manual search of the referenced studies concerning this topic was performed. There were no restrictions with respect to the year or language of the publication. Twenty-three studies were identified and 9 articles, considered as potentially relevant, were included. The labor time, shift and career progression promoted changes in body composition. Most of the policemen taking part in the studies included in this paper were overweight (BMI: 25.2–29.3), obese (body fat ≥ 25%), had increased waist (90.4–102 cm) and abdominal perimeters (18.9–90.5 cm), and had a higher risk of chronic disease, which is associated with depression and stress development. Interventional studies are needed for the purpose of proposing preventive and rehabilitation programs, which would result in providing physical and mental well-being, improvement of life quality and, especially, prevention of obesity related to police work.
    Źródło:
    International Journal of Occupational Medicine and Environmental Health; 2014, 27, 6; 891-901
    1232-1087
    1896-494X
    Pojawia się w:
    International Journal of Occupational Medicine and Environmental Health
    Dostawca treści:
    Biblioteka Nauki
    Artykuł
    Tytuł:
    First record of mites associated with lima bean (Phaseolus lunatus L.)
    Autorzy:
    Neto, A.V.G.
    Silva, P.R.R.
    Silva, J.D.C.
    Dos Santos, M.F.
    Da Silva Melo, J.W.
    De Franca, S.M.
    Powiązania:
    https://bibliotekanauki.pl/articles/2084632.pdf
    Data publikacji:
    2019
    Wydawca:
    Polska Akademia Nauk. Czytelnia Czasopism PAN
    Tematy:
    Tetranychidae
    pest mites
    legumes
    Opis:
    Pest mites of the family Tetranychidae are commonly reported in several legumes. However, reports of their occurrence in lima beans are insipient, especially in Brazil. The objective of this research was to record the occurrence of mites in lima bean plants and to describe their damage in this Fabaceae. Tetranychus neocaledonicus André and Mononychellus planki McGregor were found in lima bean plants, Phaseolus lunatus (Fabaceae or Leguminosae). The lima bean plants, when infested by these mites, initially exhibit small whitish spots in the leaflets, which with increasing population density rapidly evolve into chlorotic patches, followed by silvering, and may dry out and fall due to their overfeeding. The extent of the damage caused to lima bean plants and the adaptability of the mite to warm and dry conditions indicate that T. neocaledonicus has greater potential as a lima bean pest than M. planki in northeastern Brazil. This is the first record of these mites associated with P. lunatus.
    Źródło:
    Journal of Plant Protection Research; 2019, 59, 3; 418-422
    1427-4345
    Pojawia się w:
    Journal of Plant Protection Research
    Dostawca treści:
    Biblioteka Nauki
    Artykuł
    Tytuł:
    Selectivity of diphenyl-ether herbicide with postemergence applications in chickpea
    Autorzy:
    Silva, L.G.B.
    Da Silva Araujo, L.
    Goncalves, D.J.
    Souza Valente, M.
    Da Silva, A.R.
    Nascimento, W.M.
    Ribeiro da Cunha, P.C.
    Powiązania:
    https://bibliotekanauki.pl/articles/2084719.pdf
    Data publikacji:
    2019
    Wydawca:
    Polska Akademia Nauk. Czytelnia Czasopism PAN
    Tematy:
    Cicer arietinum
    diphenyl-ether herbicides
    weeds
    Opis:
    There are few reports in literature about the selectivity of postemergence application of herbicides for the control of eudicotyledon weeds (broadleaf) in chickpea. For this reason, the aim of this study was to investigate the selectivity of diphenyl-ether herbicides in chickpea influenced by the herbicides and application rates. A field experiment was conducted from February to June 2017 in Urutaí, state of Goiás, Brazil. Cultivar BRS Aleppo was used in the experiment. The experiment was set up in a randomized block design with 2 × 3 + 1 factorial arrangement and three replications. The first factor was herbicides (fomesafen and lactofen) with the second factor being herbicide rate (50, 75, and 100% of referenced rate) plus an untreated check as a comparison. The applied rates of herbicides were 250 and 180 g ⋅ ha–1 of fomesafen and lactofen, respectively. The selectivity of herbicides was evaluated according to agronomic characteristics (plant population, height, dry matter, number of pods per plant and 100-grain weight) and yields. Both herbicides, regardless of dosage, were selective in chickpea cultivation, even exhibiting leaf necrosis symptoms with visible injuries below 20% with no effect on yield.
    Źródło:
    Journal of Plant Protection Research; 2019, 59, 3; 350-354
    1427-4345
    Pojawia się w:
    Journal of Plant Protection Research
    Dostawca treści:
    Biblioteka Nauki
    Artykuł
    Tytuł:
    Infinite ergodic index $ℤ^d$ -actions in infinite measure
    Autorzy:
    Muehlegger, E.
    Raich, A.
    Silva, C.
    Touloumtzis, M.
    Narasimhan, B.
    Zhao, W.
    Powiązania:
    https://bibliotekanauki.pl/articles/1396029.pdf
    Data publikacji:
    1999
    Wydawca:
    Polska Akademia Nauk. Instytut Matematyczny PAN
    Opis:
    We construct infinite measure preserving and nonsingular rank one $ℤ^d$-actions. The first example is ergodic infinite measure preserving but with nonergodic, infinite conservative index, basis transformations; in this case we exhibit sets of increasing finite and infinite measure which are properly exhaustive and weakly wandering. The next examples are staircase rank one infinite measure preserving $ℤ^d$-actions; for these we show that the individual basis transformations have conservative ergodic Cartesian products of all orders, hence infinite ergodic index. We generalize this example to obtain a stronger condition called power weakly mixing. The last examples are nonsingular $ℤ^d$-actions for each Krieger ratio set type with individual basis transformations with similar properties.
    Źródło:
    Colloquium Mathematicum; 1999, 82, 2; 167-190
    0010-1354
    Pojawia się w:
    Colloquium Mathematicum
    Dostawca treści:
    Biblioteka Nauki
    Artykuł
    Tytuł:
    Radiation processing of detergents and possible environmental benefits
    Autorzy:
    Borrely, S. I.
    Romanelli, M. F.
    Pereira, M. C. C.
    da Silva, G. P.
    Mesquita, L. C. A.
    de Moraes, M. C. F.
    Powiązania:
    https://bibliotekanauki.pl/articles/148020.pdf
    Data publikacji:
    2009
    Wydawca:
    Instytut Chemii i Techniki Jądrowej
    Tematy:
    EB irradiadion
    anionic surfactants
    effluent
    Vibrio fischeri
    Daphnia similis
    Opis:
    Detergents at waters inducing negative changes for biological degradability and water general quality. Some authors have evidenced a considerable amount of anionic surfactant and toxic effects into natural water and effluents related to detergents. The objective of the study was to apply electron irradiation for reducing toxicity, and for degradation of surfactants. To quantify surfactant LAS determination as MBAS (metylene blue active substances) was applied. The capacity of radiation to reduce surfactants was evidenced for real effluent and for water solution containing sodium dodecyl sulfate, linear alkylbenzene sulfonate (LAS), separately. An electron beam accelerator (EBA) 1.5 MeV was the radiation source. Anionic surfactant solutions as well as real effluents resulted in less toxic samples after irradiation. Toxicity was evaluated for Vibrio fischeri and Daphnia similis. An important decline of total anionic surfactant was observed after irradiation to doses: 6.0 kGy and 20 kGy (surfactant in water solutions and effluents, respectively). To conclude, EBA irradiations accounted for 88% to 96% less toxic surfactants solutions and effluents and 68% to 96% for MBAS compounds decomposition.
    Źródło:
    Nukleonika; 2009, 54, 2; 61-64
    0029-5922
    1508-5791
    Pojawia się w:
    Nukleonika
    Dostawca treści:
    Biblioteka Nauki
    Artykuł
    Tytuł:
    Development and production of radioactive sources used for cancer treatment in Brazil
    Autorzy:
    Rostelato, M. E. C. M.
    Rela, P. R.
    Zeituni, C. A.
    Feher, A.
    Manzoli, J. E.
    Moura, J. A.
    Moura, E. S.
    Silva, C. P. G.
    Powiązania:
    https://bibliotekanauki.pl/articles/148305.pdf
    Data publikacji:
    2008
    Wydawca:
    Instytut Chemii i Techniki Jądrowej
    Tematy:
    radioactive sources production
    iodine-125 seeds
    iridium-192 wires
    brachytherapy
    cancer treatment
    Opis:
    The number of cancer patients in Brazil is increasing and part of the patients are submitted to brachytherapy treatment using iridium-192 wire and iodine-125 radioactive seeds. The Nuclear Energy Research Institute established a programme to produce iridium-192 wire and iodine-125 radioactive seeds. With the purpose of settling a laboratory for iridium-192 sources production, a wire activation method was developed and a hot cell for the wire manipulation, quality assurance and packaging was built. The iodine-125 seeds consist of a welded titanium capsule containing iodine-125 adsorbed onto a silver rod. Concerning the setup of the local production, the following activities were carried out: superficial treatment of the silver rod, development of a process to absorb the iodine in the silver rod, welding methodology to seal the seeds, leakage and contamination test and source activity measurement.
    Źródło:
    Nukleonika; 2008, 53, suppl. 2; 99-103
    0029-5922
    1508-5791
    Pojawia się w:
    Nukleonika
    Dostawca treści:
    Biblioteka Nauki
    Artykuł
    Tytuł:
    Combined Analyses of Ion Beam Synthesized Layers in Porous Silicon
    Autorzy:
    Ramos, A. R.
    Pászti, F.
    Horváth, Z. E.
    Vázsonyi, É.
    Conde, O.
    da Silva, M. F.
    da Silva, M. R.
    Soares, J. C.
    Powiązania:
    https://bibliotekanauki.pl/articles/2028988.pdf
    Data publikacji:
    2001-11
    Wydawca:
    Polska Akademia Nauk. Instytut Fizyki PAN
    Tematy:
    61.10.-i
    61.18.Bn
    61.43.Gt
    68.55.Ln
    Opis:
    High dose ion implantation was used to form polycrystalline silicide films on porous silicon with different native concentrations of light impurities (C and O). Porous silicon layers severalμm thick were implanted with 170 keV Cr$\text{}^{+}$ ions to fluences of 3×10$\text{}^{17}$ ions/cm$\text{}^{2}$ both at room temperature and 450ºC. Similar samples were implanted with 100 keV Co$\text{}^{+}$ ions to fluences of 2×10$\text{}^{17}$ ions/cm$\text{}^{2}$ at room temperature, 350ºC, and 450ºC. The formed silicide compounds were studied by Rutherford backscattering spectrometry, elastic recoil detection, glancing incidence X-ray diffraction, and four point-probe sheet resistance measurements. Selected Co implanted samples were analysed by cross-section transmission electron microscopy. Results show that the light impurities were partially expelled from the forming silicide layer. Combining cross-section transmission electron microscopy with ion beam methods it was possible to show that, in the implanted region, the porous structure collapses and densifies during implantation, but the underlying porous silicon remains intact. The layer structure, as well as the quality and type of the formed silicide, were found to depend on the original impurity level, implantation temperature, and annealing.
    Źródło:
    Acta Physica Polonica A; 2001, 100, 5; 773-780
    0587-4246
    1898-794X
    Pojawia się w:
    Acta Physica Polonica A
    Dostawca treści:
    Biblioteka Nauki
    Artykuł
    Tytuł:
    A note on the computation of ordered supported non-dominated solutions in the bi-criteria minimum spanning tree problems
    Autorzy:
    Silva, C. G.
    Cli'maco, J. C. N.
    Powiązania:
    https://bibliotekanauki.pl/articles/308580.pdf
    Data publikacji:
    2007
    Wydawca:
    Instytut Łączności - Państwowy Instytut Badawczy
    Tematy:
    minimum spanning tree
    supported non-dominated solutions
    combinatorial problems
    Opis:
    This paper presents a new procedure for computing the set of supported non dominated solutions of bi-criteria minimum spanning tree problems in ordered manner. The procedure is based on the systematic detection of edges which must be replaced in one efficient solution to obtain the adjacent one, in the criteria space. This new approach avoids solving unnecessary problems and makes use of previous computations.
    Źródło:
    Journal of Telecommunications and Information Technology; 2007, 4; 11-15
    1509-4553
    1899-8852
    Pojawia się w:
    Journal of Telecommunications and Information Technology
    Dostawca treści:
    Biblioteka Nauki
    Artykuł
    Tytuł:
    Analysis of the effects of recycling on process control
    Autorzy:
    Silva, Cássio R.A.
    Panuci, Victor C.
    Coutinho, Monica R.
    Conceição, Wagner A.S.
    Andrade, Cid M.G.
    Powiązania:
    https://bibliotekanauki.pl/articles/27315644.pdf
    Data publikacji:
    2023
    Wydawca:
    Zachodniopomorski Uniwersytet Technologiczny w Szczecinie. Wydawnictwo Uczelniane ZUT w Szczecinie
    Tematy:
    level control
    control structure
    decoupled tanks
    cycle
    Arduino
    Opis:
    The union of different devices in order to obtain a specific response for a process is commonly called a control system. For a control system, it is necessary to have one or more controllers. Among the most used in the industrial sector are the PID and PI controllers. Next to these controllers is the control software. Scilab is a good example of control software. It is characterized as free code software, with no cost for its acquisition, in addition to having a large computational power and integrated tools, such as Xcos, intended for modeling and simulation. For the union with Scilab, there is Arduino. Such a mixture can be used, for example, to control liquid levels in tanks. In this context, the present work aims to study the tank-level control system based on PID and PI controllers through the union between Scilab and Arduino. Phenomenological models were developed based on closed-loop control (feedback control system) of the process with two tanks not coupled with recycle. Furthermore, for comparison purposes, two approaches were used for each process: one considering the saturation of the manipulated variable and the other without the presence of such saturation. At first, there was a need to implement an anti-windup system. For tuning the controller parameters, the ISE method was used, executed through a programming code developed in Scilab. The parameters found for the two systems were tested on a made-up experimental bench. Therefore, using the block diagrams and the method here called “ISE method”, satisfactory values were obtained for the control parameters. These were ratified in the tests carried out in the experimental module. Level control was achieved with greater prominence for the PI controller since there is one less parameter to be tuned and processed by the system. This controller provided results close to the PID controller for cycles up to 50%. In general, the PI controller showed maximum response deviations smaller than the PID, such as deviations of 1.55 cm and 2.40 cm, respectively, for the case with 75% recycle. It was also clear the influence of the saturation of the manipulated variable on the system response, but not on the tuning of the controller parameterseters.
    Źródło:
    Polish Journal of Chemical Technology; 2023, 25, 2; 43--55
    1509-8117
    1899-4741
    Pojawia się w:
    Polish Journal of Chemical Technology
    Dostawca treści:
    Biblioteka Nauki
    Artykuł
    Tytuł:
    Corrosion Behavior of FeAl and Fe3Al Based Fe-Al-C Alloys in Sulfuric Acid
    Autorzy:
    Silva, A. P.
    Brito, P. P.
    Martins, N.
    Powiązania:
    https://bibliotekanauki.pl/articles/2134209.pdf
    Data publikacji:
    2022
    Wydawca:
    Polska Akademia Nauk. Czytelnia Czasopism PAN
    Tematy:
    iron aluminides
    microstructure
    mechanical properties
    corrosion resistance
    Opis:
    Iron aluminides are iron-aluminum alloys that have excellent resistance to oxidation at high temperatures with low density, high resistance/weight ratio and a low manufacturing cost. Due to its characteristics, these alloys are presented as an option to replace stainless steels in certain applications. This works intends report the casting process and subsequent analyses involving microstructure, mechanical properties, and corrosion resistance of two Fe-Al-C alloys (Fe-11wt%Al and Fe-25wt%Al, containing 0.31-0.37%C), which were prepared in an induction furnace and poured in a permanent mold. Samples of these alloys were characterized and presented elevated hardness values of 37 HRC (alloy Fe-11wt%Al) and 49.6HRC (alloy Fe-25wt%Al) and microstructure with aluminides type Fe3Al and FeAl and also carbides type K. The Fe-11wt%Al alloy exhibited superior resistance to uniform corrosion, although both Fe-Al-C alloys exhibited significantly higher corrosion rates compared to a binary iron aluminide in 0.5M H2SO4 containing naturally dissolved oxygen.
    Źródło:
    Archives of Foundry Engineering; 2022, 22, 2; 77--82
    1897-3310
    2299-2944
    Pojawia się w:
    Archives of Foundry Engineering
    Dostawca treści:
    Biblioteka Nauki
    Artykuł
    Tytuł:
    Relationship between performance, dry-land power and kinematics in master swimmers
    Autorzy:
    Espada, M. C.
    Costa, M. J.
    Costa, A. M.
    Silva, A. J.
    Barbosa, T. M.
    Pereira, A. F.
    Powiązania:
    https://bibliotekanauki.pl/articles/307228.pdf
    Data publikacji:
    2016
    Wydawca:
    Politechnika Wrocławska. Oficyna Wydawnicza Politechniki Wrocławskiej
    Tematy:
    pływanie
    kinematyka
    energia
    master swimmers
    kinematic
    dry-land power
    performance
    Opis:
    The purpose of the study was to analyze the relationships between sprint swimming performance, dry-land power, and kinematics in master swimmers. Twenty-two male master swimmers were separated in two groups based on their chronological age: (i) 30–39 years and; (ii) 40–49 years. Maximum dry-land power was determined through counter movement jump and 3 kg medicine ball throwing (Hmax and Tmax, respectively). Kinematic determinants of performance were measured during a maximal bout of 15, 25 and 50 m front crawl (T15, T25, T50). Stroke frequency (SF), stroke length (SL) and stroke index (SI) were calculated as kinematical aspects of the stroke. In the 30-39 group, SI25 was correlated to T25 (r = –0.76, p < 0.01, η2 = 0.96), the same was observed between SI50 and T50 (r = –0.83, p < 0.01, η2 = 0.96). Only SI50 was significantly correlated to T50 (r = –0.86, p < 0.01, η2 = 0.97) in the 40–49 years age cohort. In dryland power variables, Hmax and Tmax were only correlated in the younger master swimmers group (r = –0.87, p < 0.01, η2 = 0.97). There were no significant differences (p < 0.05) between younger (30–39 years) and older (40–49 years) swimmers groups in dry-land tests (Hmax 28.5 ± 5.9 vs. 26.5 ± 3.9 cm and Tmax 4.2 ± 1.0 vs. 4.2 ± 1.1 m). Our results suggest that swimming performance in younger master swimmers (30–39 years) seem more dependent on kinematic swimming variables than on strength parameters, which were most related to swimming performance in the older master swimmers (40–49 years).
    Źródło:
    Acta of Bioengineering and Biomechanics; 2016, 18, 2; 145-151
    1509-409X
    2450-6303
    Pojawia się w:
    Acta of Bioengineering and Biomechanics
    Dostawca treści:
    Biblioteka Nauki
    Artykuł
    Tytuł:
    A Whole Body Postural Loading Simulation and Assessment Model for Workplace Analysis and Design
    Autorzy:
    Rebelo, F.
    Da Silva, K. C.
    Karwowski, W.
    Powiązania:
    https://bibliotekanauki.pl/articles/90481.pdf
    Data publikacji:
    2012
    Wydawca:
    Centralny Instytut Ochrony Pracy
    Tematy:
    simulation models
    spinal loading
    ergonomics
    manual materials handling
    work design
    safety
    Opis:
    This study reports on the development and validation of a new computer model for simulating human postures at work, and assessing the reaction forces and bending moments in 43 human articulation joints. The proposed model estimates the intradiscal pressure in the vertebral column in response to external loading forces encountered during human interactions with work objects or processes. The model was implemented in a selfcontained interactive software package. The simulation results compare favorably with the reported experimental data, and provide reasonable confidence in the quality of the model. Its characteristics and its applications in evaluating physical task performance are also discussed.
    Źródło:
    International Journal of Occupational Safety and Ergonomics; 2012, 18, 4; 509-519
    1080-3548
    Pojawia się w:
    International Journal of Occupational Safety and Ergonomics
    Dostawca treści:
    Biblioteka Nauki
    Artykuł
    Tytuł:
    Calculation of grounding grids parameter at arbitrary geometry
    Autorzy:
    Silva, C. L. B.
    Pires, T. G.
    Calixto, W. P.
    Oliveira, D. N.
    Souza, L. A. P.
    Filho, A. M. S.
    Powiązania:
    https://bibliotekanauki.pl/articles/136173.pdf
    Data publikacji:
    2017
    Wydawca:
    EEEIC International Barbara Leonowicz Szabłowska
    Tematy:
    grounding grids parameters
    Heppe
    soil stratified in two layers
    Opis:
    This paper deals with the computation of ground resistance, surface voltage, touch voltage and step voltage, to mesh with horizontal wires arranged in different angles. The computer program implemented used in the mathematical modeling is based on the method proposed by Heppe, which allows obtaining the grounding parameters for homogeneous soil and soil stratified in two layers. The results obtained with the proposed method will be compared with other methods in literature. Also will be presented the results of a grounding grid using wires at various angles.
    Źródło:
    Transactions on Environment and Electrical Engineering; 2017, 2, 2; 11-17
    2450-5730
    Pojawia się w:
    Transactions on Environment and Electrical Engineering
    Dostawca treści:
    Biblioteka Nauki
    Artykuł
    Tytuł:
    Analysis of the Phase Transitions in BNT-BT Lead-Free Ceramics Around Morphotropic Phase Boundary by Mechanical and Dielectric Spectroscopies
    Autorzy:
    Silva Jr, P. S.
    Diaz, J. C. C. A.
    Florêncio, O.
    Venet, M.
    M’Peko, J. C.
    Powiązania:
    https://bibliotekanauki.pl/articles/353072.pdf
    Data publikacji:
    2016
    Wydawca:
    Polska Akademia Nauk. Czytelnia Czasopism PAN
    Tematy:
    Lead-free piezoelectric ceramics
    morphotropic phase boundary
    phase transitions
    mechanical spectroscopy
    dielectric spectroscopy
    Opis:
    In this work, the syntheses and characterization by mechanical and dielectric spectroscopies of (1-x) Bi0.5Na0.5TiO3-xBaTiO3 (BNT-100xBT), with x = 0.05, 0.06 and 0.07, lead-free piezoelectric ceramics is reported. Ceramic samples of BNT-BT have been prepared by mixed-oxide method and then conventionally sintered. X-ray diffraction patterns of sintered samples, indicated for BNT-7BT the presence of tetragonal (P4mm) complex perovskite structure, whereas for BNT-5BT and BNT-6BT the samples exhibit a mixture of tetragonal (P4mm) and rhombohedral (R3c) crystalline phases, which reveal the presence of a morphotropic phase boundary (MPB) in the BNT-BT system. Measurements of internal friction, Q-1, and the storage modulus, E’, as a function of temperature at various frequencies were carried out in a Dynamic Mechanical Analyzer (DMA), in the temperature range from 0ºC to 600ºC. Dielectric profiles are recorded in the frequency range from 1kHz to 100kHz and the temperature range from room temperature to 475ºC. Mechanical loss spectra obtained for investigated compositions of BNT-BT samples showed different frequency-independent anomalies. Two main anomalies for BNT-5BT and BNT-6BT, observed around 100ºC and 430ºC were associated with the ferroelectric-antiferroelectric and antiferroelectricparaelectric phase transitions, respectively. The results obtained from mechanical loss measurements were supported by dielectric relaxation spectra. For BNT-7BT, outside the MPB, four different frequency-independent processes were observed.
    Źródło:
    Archives of Metallurgy and Materials; 2016, 61, 1; 17-20
    1733-3490
    Pojawia się w:
    Archives of Metallurgy and Materials
    Dostawca treści:
    Biblioteka Nauki
    Artykuł
    Tytuł:
    Biomechanical modelling for whole body motion using natural coordinates
    Biomechaniczne modelowanie trójwymiarowych ruchów człowieka w środowisku współrzędnych naturalnych
    Autorzy:
    Czaplicki, A.
    Silva, M. T.
    Ambrosio, J. C.
    Powiązania:
    https://bibliotekanauki.pl/articles/281844.pdf
    Data publikacji:
    2004
    Wydawca:
    Polskie Towarzystwo Mechaniki Teoretycznej i Stosowanej
    Tematy:
    biomechanical model
    multibody dynamics
    inverse dynamics
    internal forces
    Opis:
    The study of spatial human movements requires the development and use of a three-dimensional model. The model proposed here has 44 degrees-of-freedom and it is described using natural coordinates, which do not require an explicit definition of rotation coordinates. The biomechanical model consists of 16 anatomical segments composed of 33 rigid bodies. Joint actuators are introduced into equations of motion of the multibody model by means of kinematic driver constrains in order to reflect the effect of the muscle forces about each anatomical joint. After associating a Lagrange multiplier to each joint actuator, the torques that represent muscle forces become coupled with the biomechanical model through the Jacobian matrix of the underlying multibody system. The developed model is applied to identify net torques and reaction forces at the anatomical joints in application cases that include the take-off to aerial trajectories and standing backwards somersault.
    W pracy zaprezentowano pełną metodologię do badania ruchów człowieka. Podstawowym elementem tej metodologii jest trójwymiarowy biomechaniczny model ciała ludzkiego. Położenia członów modelu opisano za pomocą współrzędnych naturalnych, co wyeliminowało konieczność użycia współrzędnych kątowych. Model składa się z 33 ciał sztywnych połączonych przegubami (stawami) i posiada 44 stopnie swobody. Wypadkowe momenty sterujące w poszczególnych stawach pochodzące od sił mięśniowych wprowadzono do dynamicznych równań ruchu modelu za pomocą stosownych więzów kinematycznych pomiędzy sąsiadującymi członami w danym stawie. Wartości tych momentów wyznaczono wykorzystując formalizm mnożników Lagrange'a. Model wykorzystano do identyfikacji wypadkowych momentów mięśniowych i reakcji wewnętrznych w głównych stawach kończyny dolnej człowieka podczas odbicia do skoku w dal oraz w trakcie wykonywania salta w tył z miejsca.
    Źródło:
    Journal of Theoretical and Applied Mechanics; 2004, 42, 4; 927-944
    1429-2955
    Pojawia się w:
    Journal of Theoretical and Applied Mechanics
    Dostawca treści:
    Biblioteka Nauki
    Artykuł
    Tytuł:
    Sensorless Control of Surface Mounted Permanent Magnet Synchronous Motors Using Matrix Converters
    Autorzy:
    Saltiveri, D.
    Arias, A.
    Asher, G.
    Sumner, M.
    Wheeler, P.
    Empringham, L.
    Silva, C.
    Powiązania:
    https://bibliotekanauki.pl/articles/262580.pdf
    Data publikacji:
    2006
    Wydawca:
    Akademia Górniczo-Hutnicza im. Stanisława Staszica w Krakowie
    Tematy:
    sensorless control
    permanent magnet synchronous motor
    matrix converters
    Opis:
    This paper investigates the influence of the power converter on the performance of Surface Mounted Permanent Magnet Synchronous Motor drives, which employ High Frequency voltage injection to achieve low and zero speed control. Experimental results demonstrate the remarkable performance of the sensor less speed and position control employing the Matrix Converter and the contributions of the Space Modulation Profiling technique. The Matrix Converter has almost zero dead time, which means that behaves almost like an ideal power converter and achieves better results than the conventional Voltage Source Inverter. A comparison of the sensor less technique proposed using both converters is made.
    Źródło:
    Electrical Power Quality and Utilisation. Journal; 2006, 12, 1; 59-67
    1896-4672
    Pojawia się w:
    Electrical Power Quality and Utilisation. Journal
    Dostawca treści:
    Biblioteka Nauki
    Artykuł
    Tytuł:
    Railway industry roadmap in the state of Santa Catarina, Brazil
    Roadmap para a indústria ferroviário do estado de Santa Catarina, Brasil
    Autorzy:
    Dias, A.
    Da Silva, J. C.
    Kagueiama, H. H.
    Haddad, C. R.
    Uriona, M. M.
    Lezana, Á. G. R.
    Juliatto, D. L.
    Powiązania:
    https://bibliotekanauki.pl/articles/374823.pdf
    Data publikacji:
    2015
    Wydawca:
    Politechnika Śląska. Wydawnictwo Politechniki Śląskiej
    Tematy:
    technology
    roadmapping
    rail industry
    technologia
    mapa drogowa
    przemysł kolejowy
    branża kolejowa
    Opis:
    This article aims to identify the main requirements to strengthen the railroad industry in Santa Catarina by using technology roadmapping. The railway industry is composed of carriers, manufacturers, suppliers, operators, logistics, services and education. The survey aimed to provide guidelines for the Federation of the State of Santa Catarina Industry (FIESC) to develop its strategic plan for the next eight years. Based on the survey, the roadmap defined vision, mission, a list of key concepts, drivers and actions for the Federation to support the railway industry development, since this industrial sector is still economically unrepresented when compared to other sectors in Santa Catarina. The survey also pointed out there is a strong expansion program of the railway freight and railway transport for people in Brazil, both in government and private sectors.
    Este artigo objetiva identificar os principais requisitos para fortalecer a indústria ferroviária em Santa Catarina (SC), por meio da aplicação do processo de technology roadmapping. A indústria ferroviária é composta por transportadores, fabricantes, fornecedores, operadores de logística, serviços e educação. A pesquisa objetivou fornecer orientações para a Federação das Indústrias de Santa Catarina (FIESC) com a finalidade de desenvolver um plano estratégico para os próximos oito anos. Baseando-se na pesquisa, definiram-se a visão, missão e uma lista de conceitos chaves, drivers e ações para que a FIESC apoiasse o desenvolvimento da indústria ferroviária, uma vez que esta é economicamente pouco representativa em comparação com outras indústrias no estado de SC. A pesquisa apontou que há forte expansão do transporte de cargas e pessoas no Brasil, tanto nos setores governamentais quanto nos setores privados.
    Źródło:
    Transport Problems; 2015, T. 10, z. spec.; 29-36
    1896-0596
    2300-861X
    Pojawia się w:
    Transport Problems
    Dostawca treści:
    Biblioteka Nauki
    Artykuł
    Tytuł:
    Geoelectric method applied in correlation between physical characteristics and electrical properties of the soil
    Autorzy:
    Filho, A. M. S.
    Silva, C. L. B.
    Oliveira, M. A. A.
    Pires, T. G.
    Alves, A. J.
    Calixto, W. P.
    Narciso, M. G.
    Powiązania:
    https://bibliotekanauki.pl/articles/136150.pdf
    Data publikacji:
    2017
    Wydawca:
    EEEIC International Barbara Leonowicz Szabłowska
    Tematy:
    geoelectrical prospecting
    apparent
    electrical resistivity
    soil compaction
    moisture content
    Opis:
    This paper presents the study of the relationship between electrical properties and physical characteristics of the soil. Measures of apparent electrical resistivity of the soil were made for different types of soil, varying moisture content gradually while maintaining a constant compaction, and then varying the compaction and relating it to a constant humidity. Development of a correlation surface is proposed in order to identify granulometry of the soil from moisture and compaction measurements. For the study of spatial variability, two areas were chosen to allow the change of moisture content and compaction in order to verify the measurement capacity of apparent electrical resistivity of the soil as methodology to identify change in soil dynamics. Results obtained show correlations among apparent electrical resistivity of the soil, moisture, soil compaction and clay content.
    Źródło:
    Transactions on Environment and Electrical Engineering; 2017, 2, 2; 37-44
    2450-5730
    Pojawia się w:
    Transactions on Environment and Electrical Engineering
    Dostawca treści:
    Biblioteka Nauki
    Artykuł
    Tytuł:
    Metric for calculation of system complexity based on its connections
    Autorzy:
    Paiva, J. R. B.
    Gomes, V. M.
    Rodrigues, B. A.
    Silva, L. F. A.
    Aniceto, B. C. M.
    Furriel, G. P.
    Calixto, W. P.
    Powiązania:
    https://bibliotekanauki.pl/articles/136166.pdf
    Data publikacji:
    2017
    Wydawca:
    EEEIC International Barbara Leonowicz Szabłowska
    Tematy:
    complexity
    connections
    modeling
    simulation
    discrete event systems
    Opis:
    This paper proposes a methodology based on system connections to calculate its complexity. Two study cases are proposed: the dining Chinese philosophers’ problem and the distribution center. Both studies are modeled using the theory of Discrete Event Systems and simulations in different contexts were performed in order to measure their complexities. The obtained results present i) the static complexity as a limiting factor for the dynamic complexity, ii) the lowest cost in terms of complexity for each unit of measure of the system performance and iii) the output sensitivity to the input parameters. The associated complexity and performance measures aggregate knowledge about the system.
    Źródło:
    Transactions on Environment and Electrical Engineering; 2017, 2, 1; 67-73
    2450-5730
    Pojawia się w:
    Transactions on Environment and Electrical Engineering
    Dostawca treści:
    Biblioteka Nauki
    Artykuł
    Tytuł:
    Effect of Majorana Fermions on Andreev Spectroscopy of Multiband Topological Superconductors
    Autorzy:
    Silva, A.
    Araújo, M.
    Sacramento, P.
    Powiązania:
    https://bibliotekanauki.pl/articles/1402577.pdf
    Data publikacji:
    2015-08
    Wydawca:
    Polska Akademia Nauk. Instytut Fizyki PAN
    Tematy:
    71.10.Fd
    71.10.Pm
    71.10.Li
    73.20.-r
    74.45.+c
    74.20.Rp
    74.70.-b
    Opis:
    We introduce a model for a multiband topological superconductor with two orbitals per lattice site, in two spatial dimensions. Concentrating on the Andreev reflection problem, the appropriate wave function matching conditions for an interface with a normal single-band metal were previously derived in the framework of a quantum waveguide theory. This theory retrieves the correct number of Majorana fermion states as predicted by the topological index. We obtain the differential conductance as a function of bias voltage, which displays the contribution of the Majorana fermions. Interface disorder is also considered. By varying band structure parameters, topological transitions can be induced, whereby the number of the Majorana modes varies. We calculate the effect of such transitions on the differential conductance.
    Źródło:
    Acta Physica Polonica A; 2015, 128, 2; 210-212
    0587-4246
    1898-794X
    Pojawia się w:
    Acta Physica Polonica A
    Dostawca treści:
    Biblioteka Nauki
    Artykuł
    Tytuł:
    First detection and molecular characterization of hepatitis E virus in water from wastewater treatment plants in Portugal
    Autorzy:
    Matos, A.
    Mesquito, J.R.
    Goncalves, D.
    Abreu-Silva, J.
    Luxo, C.
    Nascimento, M.S.
    Powiązania:
    https://bibliotekanauki.pl/articles/2081721.pdf
    Data publikacji:
    2018
    Wydawca:
    Instytut Medycyny Wsi
    Tematy:
    wastewater
    hepatitis E virus
    genotype 3
    zoonotic
    Opis:
    Hepatitis E virus (HEV) genotype 3 is widespread in industrialized countries and widely recognized as a serious public health issue. HEV genotype 3 is excreted in both human and animal stools, having the potential to be introduced in aquatic environments through wastewater discharge. For this reason, waterborne transmission of the HEV genotype 3 is drawing increasing attention from the scientific community. Although studies in Portugal have shown that HEV circulates in both humans and swine, no study has yet focused on the presence of HEV in wastewater. Hence, a total of 60 water samples (influent and effluent) from 15 Wastewater Treatment Plants (WWTP) of different regions of Portugal were tested for the presence of HEV using a broad spectrum real-time RT-PCR with amplification within the ORF2 region of HEV genome. Positive samples were retested by nested RT-PCR with amplification within the ORF1 region, sequenced followed by phylogenetic analysis. HEV sequences were retrieved from two influent samples collected in December 2013 from WWTPs of North and Central of Portugal and classified in subgenotype 3i and 3f. This is the first study showing the presence of HEV in aquatic environments of Portugal.
    Źródło:
    Annals of Agricultural and Environmental Medicine; 2018, 25, 2; 364-367
    1232-1966
    Pojawia się w:
    Annals of Agricultural and Environmental Medicine
    Dostawca treści:
    Biblioteka Nauki
    Artykuł
    Tytuł:
    Numerical simulations of sandwich structures under lateral compression
    Autorzy:
    Estrada, Quirino
    Szwedowicz, Dariusz
    Vergara, Julio C.
    Solis, José
    Paredes, Miguel A.
    Wiebe, Lara
    Silva, Jesús M.
    Powiązania:
    https://bibliotekanauki.pl/articles/118167.pdf
    Data publikacji:
    2019
    Wydawca:
    Polskie Towarzystwo Promocji Wiedzy
    Tematy:
    sandwich structures
    crashworthiness
    finite element method
    struktury warstwowe
    odporność na zderzenia
    metoda elementów skończonych
    Opis:
    The current paper analyzes the effect of the cross-section on the energy absorption capabilities of sandwich structures under compressive loads. For this purpose, several cross-section including triangular, square, hexagonal and circular shapes were analyzed using Abaqus software. According to the results the hexagonal shape is the most favorable cross-section to increase the crashworthiness performance of the structures up to 700% of CFE with respect to the square arrangement.
    Źródło:
    Applied Computer Science; 2019, 15, 2; 31-41
    1895-3735
    Pojawia się w:
    Applied Computer Science
    Dostawca treści:
    Biblioteka Nauki
    Artykuł
    Tytuł:
    Involvement of carbohydrates and antioxidant enzymes in the oxidative balance during drought and recovery: the eucalyptus case
    Autorzy:
    Correia, B.
    Silva, S.
    Jesus, C.
    Valledor, L.
    Dias, M.
    Costa, A.
    Santos, C.
    Pinto, G.
    Powiązania:
    https://bibliotekanauki.pl/articles/79853.pdf
    Data publikacji:
    2013
    Wydawca:
    Polska Akademia Nauk. Czytelnia Czasopism PAN
    Tematy:
    conference
    carbohydrate
    antioxidative enzyme
    oxidative balance
    drought
    recovery
    cellular function
    abiotic stress
    reactive oxygen species
    eucalyptus
    Eucalyptus globulus
    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
    Tytuł:
    Radiation-induced cancer risk and decision-making in a simulated Cs-137 urban event
    Autorzy:
    Andrade, Edson R.
    Gomes, Renato G.
    Stenders, Ricardo
    Brum, Tercio
    Lima, Sergio X.
    Castro, Mariana S. C.
    Silva, Ademir X.
    Powiązania:
    https://bibliotekanauki.pl/articles/146858.pdf
    Data publikacji:
    2020
    Wydawca:
    Instytut Chemii i Techniki Jądrowej
    Tematy:
    environmental contamination
    dispersive device
    decision-making
    Opis:
    The triggering of a “dirty bomb” generates a complex scenario, with enormous challenges for the responders due to initial misinformation and the urgency to act quickly yet effectively. Normally, the first 100 h are decisive for perceiving the risk in a more realistic dimension, but the support of methodologies that rely on computational simulations can be valuable when making key decisions. This work seeks to provide support for the early decision-making process by using a Gaussian model for the distribution of a quantity of Cs-137 spread by a radiological dispersive device (RDD). By sequentially joining two independent programs, HotSpot Health Physics codes and RESidual RADiation (RESRAD)-RDD family of codes, we came up with results that suggest a segmented approach to the potentially affected population. These results advocate that (a) the atmospheric stability conditions represented by the Pasquill–Gifford classes and (b) the population subgroups defi ned by radiation exposure conditions strongly influence the postdetonation radiological effects. These variables should be taken into account in the elaboration of flexible strategies that include many climatic conditions and to prioritize attention to different groups of public at risk. During the initial phases of such an event, it is believed that simulations using Gaussian models may be of value in anticipating the possible changes in key variables during the decision-making process. These variables may severely affect the effectiveness of the actions of responders and the general public’s safety.
    Źródło:
    Nukleonika; 2020, 65, 1; 37-43
    0029-5922
    1508-5791
    Pojawia się w:
    Nukleonika
    Dostawca treści:
    Biblioteka Nauki
    Artykuł
    Tytuł:
    Spatial analysis of vegetal cover and sediment yield in Tapacura river catchment based on remote sensing and GIS
    Analiza przestrzenna ilosci sedymentu oraz pokrywy roslinnej w zlewni rzeki Tapacura okreslona na podstawie zdalnych obserwacji oraz analizy GIS
    Autorzy:
    Silva, R M
    Santos, C.A.G.
    Gico Lima Montenegro, S.M.
    Silva, L.P.
    Powiązania:
    https://bibliotekanauki.pl/articles/81843.pdf
    Data publikacji:
    2010
    Wydawca:
    Szkoła Główna Gospodarstwa Wiejskiego w Warszawie. Wydawnictwo Szkoły Głównej Gospodarstwa Wiejskiego w Warszawie
    Tematy:
    spatial analysis
    vegetation cover
    sediment yield
    Tapacura River
    catchment
    remote sensing
    GIS analysis
    Opis:
    Mapping and assessment of erosion risk is an important tool for planning of natural resources management, allowing researchers to propose modifi cation in land-use properly and implement more sustainable management strategies in the long-term. The Tapacurá river catchment, located in Pernambuco State, Northeastern Brazil, is one of the planning units for management of water resources of Recife Metropilitan Region (RMR), and it is divided into 12 sub-basins. The objective of this study is to evaluate the spatial variability of vegetal cover and sediment yield in this basin through remote sensing and GIS techniques. Maps of the erosivity (R), erodibility (K), topographic (LS), cover-management (C) and support practice (P) factors were derived from the digital elevation model (DEM), climate database, and soil and NDVI maps, taking into account information available in the literature. In order to validate the simulation process, Sediment Delivery Ratio (SDR) was estimated. The obtained NDVI map showed vegetation loss during the analyzed period, indicating a distinct contrast between loss and gains of vegetation index. The vegetation and sediment yield mapping showed to be a useful tool for environmental monitoring and management, which can provide satisfactory results when jointly used. The results suggest a mean SDR around 0.9 and estimate the sediment yield as 23.98 ton/ha/month.
    Analiza przestrzenna ilości sedymentu oraz pokrywy roślinnej w zlewni rzeki Tapacura określona na podstawie zdalnych obserwacji oraz analizy GIS. Artykuł przedstawia sposób wykorzystania zebranych w terenie danych dotyczących pokrywy roślinnej oraz ilości sedymentu określonego za pomocą zdalnych obserwacji oraz analizy GIS w celu monitorowania środowiska i zarządzania zlewniami. W pracy wykorzystano metodę USLE-SDR, a także cyfrowy model terenu. Badania prowadzono w zlewni rzeki Tapacura w północno-wschodniej Brazylii. Wyniki sugerują przyjęcie wartości parametru SDR = 0,9, a oszacowana wielkość transportu rumowiska wynosi 23,98 t/ha/miesiąc.
    Źródło:
    Annals of Warsaw University of Life Sciences - SGGW. Land Reclamation; 2010, 42, 1; 5-16
    0208-5771
    Pojawia się w:
    Annals of Warsaw University of Life Sciences - SGGW. Land Reclamation
    Dostawca treści:
    Biblioteka Nauki
    Artykuł
    Tytuł:
    Effect of position of fruits in a tree and number of fruits per panicle on growth and quality of citrus
    Autorzy:
    Sakhidin, -
    Teixeira de Silva, J.A.
    Suparto, S.R.
    Powiązania:
    https://bibliotekanauki.pl/articles/1076701.pdf
    Data publikacji:
    2018
    Wydawca:
    Instytut Ogrodnictwa
    Tematy:
    citrus
    citrus fruit
    citrus orchard
    central Java
    Indonesia
    fruit diameter
    fruit weight
    fruit pulp
    sugar content
    vitamin C
    Opis:
    This research aimed to study the effect of the position of fruits in a tree (inner or outer) and the number of fruits per panicle (one, two or three) on the growth and quality of citrus ‘Pontianak’. The study was conducted in a citrus orchard in Central Java, Indonesia for two seasons, 2014/2015 and 2015/2016. The results indicated that position of fruits on the tree did not influence weight and diameter of fruits, weight of fruit pulp, and contents of sugars and total acids. Increasing the number of fruits per panicle decreased the weight and diameter of fruits and the weight of pulp but increased the contents of vitamin C and total acids.
    Źródło:
    Journal of Horticultural Research; 2018, 26, 1
    2300-5009
    Pojawia się w:
    Journal of Horticultural Research
    Dostawca treści:
    Biblioteka Nauki
    Artykuł
    Tytuł:
    Failure control of Plutella xylostella (Lepidoptera: Plutellidae) and selectivity of their natural enemies to different insecticides
    Autorzy:
    Bacci, L.
    Rosado, J.F.
    Picanco, M.C.
    Gonring, A.H.R.
    da Silva Galdino, T.V.
    Martins, J.C.
    Powiązania:
    https://bibliotekanauki.pl/articles/66522.pdf
    Data publikacji:
    2018
    Wydawca:
    Polska Akademia Nauk. Czytelnia Czasopism PAN
    Tematy:
    biological control
    Plutella xylostella
    Lepidoptera
    Plutellidae
    selectivity
    plant pest
    natural enemy
    insecticide
    Brassica
    crop
    cabbage moth
    Opis:
    Control failure of pests and selectivity of insecticides to beneficial arthropods are key data for the implementation of Integrated Pest Management (IPM) programs. Therefore, the aim of this study was to assess the control failure likelihood of Plutella xylostella and the physiological selectivity active ingredients to parasitoid Oomyzus sokolowskii (Hymenoptera: Eulophidae) and to predators Polybia scutellaris (Hymenoptera: Vespidae) and Lasiochilus sp. (Hemiptera: Anthocoridae). In bioassays, P. xylostella larvae and O. sokolowskii, P. scutellaris and Lasiochilus sp. adults were used. Concentration-mortality curves of six insecticides for P. xylostella were established. These curves were used to estimate the mortality of P. xylostella at the recommended concentration, in order to check a control failure of insecticides to this pest. Furthermore, the lethal concentration for 90% of populations (LC90) and the half of LC90 were used in bioassays with the natural enemies to determine the selectivity of these insects to insecticides. All tested insecticides showed control failure to P. xylostella, indicated by high LC90 and low estimated mortalities (less than 80%). The cartap insecticide was selective in half of LC90 to Lasiochilus sp. and moderately selective in LC90 and the half of LC90, to Lasiochilus sp. and P. scutellaris, respectively. Deltamethrin was moderately selective in the half of LC90 to predator Lasiochilus sp. Cartap, carbaryl, and deltamethrin reduced the mortality of Lasiochilus sp. in the half LC90. The results also showed that the insecticides methamidophos, carbaryl, parathion methyl and permethrin were not selective to any of the tested natural enemies. The role of insecticides in IPM systems of Brassica crops is discussed based on their control failures to P. xylostella and selectivity to their natural enemies.
    Źródło:
    Journal of Plant Protection Research; 2018, 58, 2
    1427-4345
    Pojawia się w:
    Journal of Plant Protection Research
    Dostawca treści:
    Biblioteka Nauki
    Artykuł
    Tytuł:
    Development of an irradiation system for a small size continuous run multipurpose gamma irradiator
    Autorzy:
    Calvo, W. A. P.
    Rela, P. R.
    Napolitano, C. M.
    Kodama, Y.
    Omi, N. M.
    da Costa, F.
    de Andrade e Silva, L. G.
    Powiązania:
    https://bibliotekanauki.pl/articles/148041.pdf
    Data publikacji:
    2009
    Wydawca:
    Instytut Chemii i Techniki Jądrowej
    Tematy:
    multipurpose irradiator
    gamma irradiator
    compact irradiator
    cobalt-60 irradiator
    gamma facility
    Opis:
    The Radiation Technology Center from IPEN-CNEN/SP, Brazil, developed a revolutionary design and national technology, a small-sized continuous run and multipurpose industrial gamma irradiator, to be used as a demonstration facility for manufacturers and contract service companies, which need economical and logistical in-house irradiation system alternatives. Also, to be useful for supporting the local scientific community on development of products and process using gamma radiation, assisting the traditional and potential users on process validation, training and qualification of operators and radioprotection officers. The developed technology for this facility consists of a continuous tote box transport system, comprising a single concrete vault, where the automated transport system of products inside and outside of the irradiator utilizes a rotating door, integrated with the shielding, avoiding the traditional maze configuration. Covering 76 m2 of floor area, the irradiator design is a product overlap sources and the maximum capacity of cobalt-60 wet sources is 37 PBq. The performed qualification program of this multipurpose irradiator was based on AAMI/ISO 11137 standard, which recommends the inclusion of the following elements: installation and process qualification. The initial load of the multipurpose irradiator was 3.4 PBq with 13 cobalt-60 sources model C-188, supplied by MDS Nordion – Canada. For irradiator dose optimization, the source distribution was done using the software Cadgamma developed by IPEN-CNEN/SP. The polymethylmetacrylate (PMMA) dosimeter system, certified by the International Dose Assurance Service (IDAS) of the International Atomic Energy Agency (IAEA) was used for irradiator dose mapping. The economic analysis, performance concerning with dose uniformity and cobalt-60 utilization efficiency were calculated and compared with other commercial gamma irradiators available on the market.
    Źródło:
    Nukleonika; 2009, 54, 2; 93-97
    0029-5922
    1508-5791
    Pojawia się w:
    Nukleonika
    Dostawca treści:
    Biblioteka Nauki
    Artykuł
    Tytuł:
    Application of comparative design study in the development of preservation encasements for historical documents
    Autorzy:
    Ramirez-Reivich, Alejandro C.
    Corona-Lira, Ma. Pilar
    Zamora-Garcia, Diego A.
    Velazquez-Silva, Anahí
    Borja, Vicente
    Powiązania:
    https://bibliotekanauki.pl/articles/1845030.pdf
    Data publikacji:
    2021
    Wydawca:
    Polska Akademia Nauk. Czytelnia Czasopism PAN
    Tematy:
    comparative design study
    engineering design
    preservation encasements
    porównawcze studium projektowe
    projekt inżynierski
    obudowa konserwacyjna
    Opis:
    The preservation of historical documents is a task that requires a multidisciplinary team. Mechanical engineering can make valuable contributions. Historical documents made of paper have unique characteristics that must be considered for their preservation and exhibition. Specially designed encasements have emerged as a solution to meet these requirements. In the present research, a comparative design study was carried out. The study comprises identifying the main functions of the encasements. Subsequently, it is analyzed how the capsules that appear in the literature have solved these functions. With the information obtained, three new encasements were designed for historical documents in Mexico. From the results and design experiences, some insights and design principles were obtained; these can be universally applied.
    Źródło:
    Archive of Mechanical Engineering; 2021, LXVIII, 3; 287-301
    0004-0738
    Pojawia się w:
    Archive of Mechanical Engineering
    Dostawca treści:
    Biblioteka Nauki
    Artykuł
    Tytuł:
    Fatigue design and prevention in movable scaffolding systems
    Projektowanie ruchomych systemów rusztowań z uwzględnieniem obciążęń zmęczeniowych
    Autorzy:
    Coelho, H.
    Torres, A.
    Pacheco, P.
    Moreira, C.
    Silva, R.
    Soares, J. M.
    Pinto, D.
    Powiązania:
    https://bibliotekanauki.pl/articles/396185.pdf
    Data publikacji:
    2017
    Wydawca:
    Uniwersytet Zielonogórski. Oficyna Wydawnicza
    Tematy:
    mosty
    Movable Scaffolding System
    MSS
    system ruchomych rusztowań
    obciążenia zmęczeniowe
    bridge construction
    fatigue
    Opis:
    The Movable Scaffolding System (MSS) is a heavy construction equipment used for casting situ of concrete bridge decks. In the past decades, MSSs have become increasingly complex and industrialized, enlarging its span ranges, incorporating auxiliary elevation machinery and increasing productivity. The tendency nowadays is for strong reutilization and the notion of MSS as a disposable or temporary structure is somehow reductive. The main structure of MSSs may be potentially exposed to fatigue, usually characterized by low number of cycles with significant stress amplitude. Fatigue may be prevented through adequate design; judicious selection of materials; demanding quality control and implementation of robust inspection and maintenance plans.
    System ruchomych rusztowań – Movable Scaffolding System (MSS) to ciężki konstrukcja budowlana wspomagająca wykonanie betonowych mostów. W ostatnich dekadach MSS stały się coraz bardziej skomplikowane i uniwersalne, stanowią element nośny dla wielu urządzeń zarówno podczas wykonywania mostu jak i podczas eksploatacji. Główna struktura systemów MSS może być narażona na efekt zmęczenia, obiążenia zwykle charakteryzują się niską liczbą cykli o znacznej amplitudzie naprężeń. Zmęczeniu można zapobiec poprzez odpowiedni projekt i rozsądny dobór materiałów. Jest to konstrukcja wymagająca ścisłej kontroli jakości i wdrożenia solidnych planów inspekcji i konserwacji.
    Źródło:
    Civil and Environmental Engineering Reports; 2017, No. 25(2); 77-88
    2080-5187
    2450-8594
    Pojawia się w:
    Civil and Environmental Engineering Reports
    Dostawca treści:
    Biblioteka Nauki
    Artykuł
    Tytuł:
    Estimation of ISTTOK runaway - electrons energies by means of a Cherenkov - type probe with modified AlN radiators
    Autorzy:
    Jakubowski, L.
    Plyusnin, V. V.
    Sadowski, M. J.
    Zebrowski, J.
    Malinowski, K.
    Rabiński, M.
    Fernandes, H.
    Silva, C.
    Duarte, P.
    Jakubowski, M.
    Powiązania:
    https://bibliotekanauki.pl/articles/147516.pdf
    Data publikacji:
    2012
    Wydawca:
    Instytut Chemii i Techniki Jądrowej
    Tematy:
    ISTTOK
    runaway electrons
    Cherenkov detector
    AlN radiators
    Opis:
    Measurements of fast electrons, as performed during recent few years in small tokamaks, demonstrated that detectors based on the Cherenkov effect are very useful tools for such studies. The modernized measuring heads, which were equipped with miniature aluminum-nitride (AlN) radiators, enabled to determine locations and instants of the fast electrons emission and to estimate their energy. A comparison of four measuring channels showed that in ISTTOK the most important role was played by electrons of energy less than 90 keV.
    Źródło:
    Nukleonika; 2012, 57, 2; 177-181
    0029-5922
    1508-5791
    Pojawia się w:
    Nukleonika
    Dostawca treści:
    Biblioteka Nauki
    Artykuł
    Tytuł:
    Ultrastructural Re-description of Henneguya piaractus (Myxozoa), a Parasite of the Freshwater Fish Piaractus mesopotamicus (Teleostei, Characidae) from the Paraguai River, Brazil
    Autorzy:
    AZEVEDO, Carlos
    Marques, Débora K. S.
    Casal, Graça
    Amaral, Cristiane M. C.
    Silva, Edinael V.
    Matos, Patrícia
    Matos, Edilson
    Powiązania:
    https://bibliotekanauki.pl/articles/763491.pdf
    Data publikacji:
    2010
    Wydawca:
    Uniwersytet Jagielloński. Wydawnictwo Uniwersytetu Jagiellońskiego
    Tematy:
    Brazilian fish, Henneguya piaractus, Myxozoa, parasite, ultrastructure
    Opis:
    Ultrastructural analyses of fish-infecting myxosporean Henneguya piaractus that is found in the gill lamellae of the freshwater teleost Piaractus mesopotamicus (Characidae) and collected from the Paraguai River, Brazil were described. The parasite occurs within large whitish spherical to ellipsoidal polysporic cysts (up to 2.5 mm long) delimited by a layer of fibroblasts generally connected with some capillaries on the gill epithelium. No external morphological signs of disease were visible in the infected fishes. The tailed spores measured 61.5 ± 0.91 (60.2–62.6) μm in total length and ellipsoidal spore body 21.1 ± 0.62 (20.6–21.9) μm long, 6.7 ± 0.40 (6.2–7.3) μm wide and 2.5 ± 0.54 (2.0–3.1) μm thick. The spore wall was about 97 nm of thickness and consisted of a thin electron-dense exospore and a thick electron-lucent endospore with about 85 nm of thickness. The tailed spores were composed of two equal–sized shell valves adhering together along the straight suture line each having in continuity a equal caudal tapering tail measuring 40.5 ± 1.02 (38.7–43.1) μm in length. Two symmetric polar capsules measured 9.8 ± 0.28 (9.3–10.1) μm long and 1.9 ± 0.37 (1.4–2.4) μm wide, each having a polar filament with 10–11 (rarely 12) coils
    Źródło:
    Acta Protozoologica; 2010, 49, 2
    1689-0027
    Pojawia się w:
    Acta Protozoologica
    Dostawca treści:
    Biblioteka Nauki
    Artykuł
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