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    Wyświetlanie 1-14 z 14
    Tytuł:
    An asymptotically unbiased moment estimator of a negative extreme value index
    Autorzy:
    Caeiro, Frederico
    Gomes, M.
    Powiązania:
    https://bibliotekanauki.pl/articles/729970.pdf
    Data publikacji:
    2010
    Wydawca:
    Uniwersytet Zielonogórski. Wydział Matematyki, Informatyki i Ekonometrii
    Tematy:
    extreme value index
    semi-parametric estimation
    moment estimator
    Opis:
    In this paper we consider a new class of consistent semi-parametric estimators of a negative extreme value index, based on the set of the k largest observations. This class of estimators depends on a control or tuning parameter, which enables us to have access to an estimator with a null second-order component of asymptotic bias, and with a rather interesting mean squared error, as a function of k. We study the consistency and asymptotic normality of the proposed estimators. Their finite sample behaviour is obtained through Monte Carlo simulation.
    Źródło:
    Discussiones Mathematicae Probability and Statistics; 2010, 30, 1; 5-19
    1509-9423
    Pojawia się w:
    Discussiones Mathematicae Probability and Statistics
    Dostawca treści:
    Biblioteka Nauki
    Artykuł
    Tytuł:
    Comparison at optimal levels of classical tail index estimators: a challenge for reduced-bias estimation?
    Autorzy:
    Gomes, M.
    Henriques-Rodrigues, Lígia
    Powiązania:
    https://bibliotekanauki.pl/articles/729988.pdf
    Data publikacji:
    2010
    Wydawca:
    Uniwersytet Zielonogórski. Wydział Matematyki, Informatyki i Ekonometrii
    Tematy:
    statistics of extremes
    semi-parametric estimation
    bias estimation
    heavy tails
    optimal levels
    Opis:
    In this article, we begin with an asymptotic comparison at optimal levels of the so-called "maximum likelihood" (ML) extreme value index estimator, based on the excesses over a high random threshold, denoted PORT-ML, with PORT standing for peaks over random thresholds, with a similar ML estimator, denoted PORT-MP, with MP standing for modified-Pareto. The PORT-MP estimator is based on the same excesses, but with a trial of accommodation of bias on the Generalized Pareto model underlying those excesses. We next compare the behaviour of these ML implicit estimators with the equivalent behaviour of a few explicit tail index estimators, the Hill, the moment, the generalized Hill and the mixed moment. As expected, none of the estimators can always dominate the alternatives, even when we include second-order MVRB tail index estimators, with MVRB standing for minimum-variance reduced-bias. However, the asymptotic performance of the MVRB estimators is quite interesting and provides a challenge for a further study of these MVRB estimators at optimal levels.
    Źródło:
    Discussiones Mathematicae Probability and Statistics; 2010, 30, 1; 35-51
    1509-9423
    Pojawia się w:
    Discussiones Mathematicae Probability and Statistics
    Dostawca treści:
    Biblioteka Nauki
    Artykuł
    Tytuł:
    Analysis and monitoring of electrical grounding grid encapsulated with concrete: case study using simulation in finite element method
    Autorzy:
    Pereira, T. M.
    Lima, R.
    Gomes, V. M.
    Calixto, W. P.
    Alves, A. J.
    Powiązania:
    https://bibliotekanauki.pl/articles/136184.pdf
    Data publikacji:
    2017
    Wydawca:
    EEEIC International Barbara Leonowicz Szabłowska
    Tematy:
    grounding systems
    finite elements method
    Opis:
    This work study the influence of concrete, plaster, clay and others buried structures in grounding systems. Comparison of soil characteristics between dry and rainy seasons on different grounding systems. The study includes comparison of six different grounding system on dry season and wet season. Simulations in finite element method was performed for tree layer stratified soil and the electrostatic equipotential surfaces were mapped into the region of interest.
    Źródło:
    Transactions on Environment and Electrical Engineering; 2017, 2, 2; 31-36
    2450-5730
    Pojawia się w:
    Transactions on Environment and Electrical Engineering
    Dostawca treści:
    Biblioteka Nauki
    Artykuł
    Tytuł:
    Charge-Ordering and Magnetoelastic Coupling Effects on the Magnetocaloric Properties of Manganites
    Autorzy:
    Reis, M. S.
    Gomes, A. M.
    Araújo, J. P.
    Tavares, P. B.
    Amaral, J. S.
    Oliveira, I. S.
    Amaral, V. S.
    Powiązania:
    https://bibliotekanauki.pl/articles/2037124.pdf
    Data publikacji:
    2004
    Wydawca:
    Polska Akademia Nauk. Instytut Fizyki PAN
    Tematy:
    75.30.Sg
    75.30.Kz
    75.80.+q
    Opis:
    A study of the magnetocaloric properties of La$\text{}_{1-x-y}$Y$\text{}_{y}$Ca$\text{}_{x}$MnO$\text{}_{3}$, La$\text{}_{1-x}$Cd$\text{}_{x}$MnO$\text{}_{3}$, and Pr$\text{}_{1-x}$Ca$\text{}_{x}$MnO$\text{}_{3}$ manganites with ferromagnetic and charge-ordered states is presented. The ferromagnetic lanthanum manganites show a negative entropy change peakΔ S under the application of a magnetic field at the Curie temperature. However, the magnetoelastic coupling effects lead to a first-order paramagnetic-ferromagn etic transition and an increasedΔ S compared to simple ferromagnets. This effect is analyzed in the framework of the Landau theory of phase transitions which shows a comparable influence of the magnetoelastic couplings and the ordinary magnetic ordering effect. The Pr$\text{}_{1-x}$Ca$\text{}_{x}$MnO $\text{}_{3}$ system shows a rich electric and magnetic phase diagram, with a ferromagnetic insulator phase for 0.15
    Źródło:
    Acta Physica Polonica A; 2004, 105, 1-2; 163-171
    0587-4246
    1898-794X
    Pojawia się w:
    Acta Physica Polonica A
    Dostawca treści:
    Biblioteka Nauki
    Artykuł
    Tytuł:
    Calculation of the influence of slot geometry on the magnetic flux density of the air gap
    Autorzy:
    Lima, R. A. de
    Coimbra, A. C. P.
    Almeida, T.
    Gomes, V. M.
    Pereira, T. M.
    Alves, A. J.
    Calixto, W. P.
    Powiązania:
    https://bibliotekanauki.pl/articles/136264.pdf
    Data publikacji:
    2017
    Wydawca:
    EEEIC International Barbara Leonowicz Szabłowska
    Tematy:
    Carter's factor
    finite element method
    rotating machines
    Opis:
    The objective of this work is to investigate the influence of slotted air gap constructive parameters on magnetic flux density of rotating machines. For this purpose, different approaches were used to solve the air gap field diagram using finite element method and the magnetic field distribution uniformity was evaluated by Carter's factor calculation on two-dimensional and three-dimensional models. Sensitivity analysis of slot constructive parameters was performed and results show that slot geometry modifies the magnetic flux on air gap and shifts the air gap magnetic equipotential midline of double slotted machines. Finally, minimization of Carter’s factor on two-dimensional model presents an optimized slot geometry with a near uniform magnetic flux density distribution.
    Źródło:
    Transactions on Environment and Electrical Engineering; 2017, 2, 1; 81-89
    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:
    Proposal of heuristic regression method applied in descriptive data analysis: case studies
    Autorzy:
    Gomes, F. A.
    Assis, A. de O.
    Reis, M. R. da C.
    Gomes, V. M.
    Oliveira, S. G. M.
    Araujo, W. R. H. de
    Calixto, W. P.
    Powiązania:
    https://bibliotekanauki.pl/articles/136229.pdf
    Data publikacji:
    2017
    Wydawca:
    EEEIC International Barbara Leonowicz Szabłowska
    Tematy:
    regression
    data analysis
    optimization
    heuristic
    modeling
    Opis:
    The purpose of this paper is to use the hybridized optimization method in order to find mathematical structures for analysis of experimental data. The heuristic optimization method will be hybridized with deterministic optimization method in order to that structures found require not knowledge about data generated experimentally. Five case studies are proposed and discussed to validate the results. The proposed method has viable solution for the analysis of experimental data and extrapolation, with mathematical expression reduced.
    Źródło:
    Transactions on Environment and Electrical Engineering; 2017, 2, 2; 51-57
    2450-5730
    Pojawia się w:
    Transactions on Environment and Electrical Engineering
    Dostawca treści:
    Biblioteka Nauki
    Artykuł
    Tytuł:
    Consequences of the pandemic constraints on the supply chain of companies: an exploratory approach
    Konsekwencje ograniczeń pandemicznych dla łańcucha dostaw przedsiębiorstw: podejście eksploracyjne
    Autorzy:
    Gomes, Sofia
    Lopes, João M.
    Powiązania:
    https://bibliotekanauki.pl/articles/27315169.pdf
    Data publikacji:
    2022
    Wydawca:
    Politechnika Częstochowska
    Tematy:
    logistics
    supply chain vulnerability
    resilience
    COVID-19 pandemic
    supply chain disruptions
    logistyka
    podatność łańcucha dostaw
    odporność
    pandemia COVID-19
    zakłócenia w łańcuchu dostaw
    Opis:
    The disruption in the supply chain imposed by the COVID-19 pandemic has posed important challenges for companies. This study explores the consequences of the pandemic on the supply chain of companies, identifying the main problems and proposing solutions for future disruptive situations. The qualitative study presented is based on the study of multiple cases obtained through interviews with Portuguese companies. Exploring the multiple cases of companies revealed that companies with less resilient and more vulnerable supply chains, both upstream and downstream, were most affected by the pandemic. The supply chain that includes redundancies and adopting appropriate risk management tools by companies guarantees greater flexibility for supply chains to adapt more quickly to disruptive situations. This exploratory study contributes to the approach of the Complex Adaptive System theory and brings new insights into the consequences of the pandemic on supply chains.
    Zakłócenia w łańcuchu dostaw narzucone przez pandemię COVID-19 spowodowały istotne wyzwania dla firm. W niniejszym opracowaniu zbadano konsekwencje pandemii dla łańcucha dostaw firm, identyfikując główne problemy i proponując rozwiązania dla przyszłych sytuacji zakłócających. Przedstawione badanie jakościowe opiera się na badaniu wielokrotnych przypadków uzyskanych dzięki wywiadom z portugalskimi firmami. Badanie wielu przypadków przedsiębiorstw ujawniło, że firmy o mniej odpornych i bardziej wrażliwych łańcuchach dostaw, zarówno w górę, jak i w dół łańcucha, zostały najbardziej dotknięte przez pandemię. Łańcuch dostaw obejmujący redundancje i przyjęcie przez firmy odpowiednich narzędzi zarządzania ryzykiem gwarantuje większą elastyczność łańcuchów dostaw w celu szybszego dostosowania się do sytuacji zakłócających. To badanie eksploracyjne wnosi wkład do podejścia teorii Complex Adaptive System i przynosi nowe spojrzenie na konsekwencje pandemii dla łańcuchów dostaw.
    Źródło:
    Polish Journal of Management Studies; 2022, 26, 2; 162--171
    2081-7452
    Pojawia się w:
    Polish Journal of Management Studies
    Dostawca treści:
    Biblioteka Nauki
    Artykuł
    Tytuł:
    The philosophers stone of entrepreneurship: achieving economic growth in Europe
    Kamień filozoficzny przedsiębiorczości: osiągnięcie wzrostu gospodarczego w Europie
    Autorzy:
    Lopes, João M.
    Gomes, Sofia
    Powiązania:
    https://bibliotekanauki.pl/articles/27315250.pdf
    Data publikacji:
    2022
    Wydawca:
    Politechnika Częstochowska
    Tematy:
    entrepreneurship
    entrepreneurial behaviour and attitudes
    perceived opportunities
    Global Entrepreneurship Monitor
    GEM
    economic growth
    przedsiębiorczość
    zachowania przedsiębiorcze
    postawy przedsiębiorcze
    postrzegane możliwości
    Globalny Monitor Przedsiębiorczości
    wzrost gospodarczy
    Opis:
    This study aims to assess the impact of perceived opportunities and entrepreneurship as a good career choice on the economic growth of European countries. A quantitative methodology was used. A data panel composed of measures of economic growth and business activity for 21 European countries from 2001 to 2019 and macroeconomic control variables was used. Multiple linear regression was estimated using the Generalised Panel Methods of Moments. High levels of perceived opportunity were found to impact economic growth positively. Entrepreneurship as a good career choice has positive impacts on economic growth. These results indicate that although entrepreneurship as a good career choice and perceived opportunity are antecedents of entrepreneurial activity, they may be considered drivers of economic growth in European countries and, as such, should be stimulated and supported. This article is original because it is a longitudinal study, and there are few studies on this topic.
    Niniejsze badanie ma na celu ocenę wpływu postrzeganych możliwości i przedsiębiorczości jako dobrego wyboru kariery na wzrost gospodarczy krajów europejskich. Zastosowano metodologię ilościową. Wykorzystano panel danych złożony z miar wzrostu gospodarczego i aktywności biznesowej dla 21 krajów europejskich w latach 2001-2019 oraz makroekonomicznych zmiennych kontrolnych. Wielokrotna regresja liniowa została oszacowana przy użyciu uogólnionej panelowej metody momentów. Stwierdzono, że wysoki poziom postrzeganych możliwości pozytywnie wpływa na wzrost gospodarczy. Przedsiębiorczość jako dobry wybór kariery ma pozytywny wpływ na wzrost gospodarczy. Wyniki te wskazują, że chociaż przedsiębiorczość jako dobry wybór kariery i postrzegane możliwości są antecedentami działalności przedsiębiorczej, można je uznać za motory wzrostu gospodarczego w krajach europejskich i jako takie powinny być stymulowane i wspierane. Ten artykuł jest oryginalny, ponieważ jest to badanie podłużne i istnieje niewiele badań na ten temat.
    Źródło:
    Polish Journal of Management Studies; 2022, 26, 1; 157--171
    2081-7452
    Pojawia się w:
    Polish Journal of Management Studies
    Dostawca treści:
    Biblioteka Nauki
    Artykuł
    Tytuł:
    Electrical Characterization of Semiconducting Polymers
    Autorzy:
    Stallinga, P.
    Gomes, H. L.
    Jones, G. W.
    Taylor, D. M.
    Powiązania:
    https://bibliotekanauki.pl/articles/1992199.pdf
    Data publikacji:
    1998-09
    Wydawca:
    Polska Akademia Nauk. Instytut Fizyki PAN
    Tematy:
    73.61.Ph
    73.40.-c
    Opis:
    Schottky diodes resulting from an intimate contact of aluminum on electrodeposited poly(3-methylthiopene) were studied by admittance spectroscopy, capacitance-voltage measurements and voltaic and optically-induced current and capacitance transients. The loss tangents show the existence of interface states that can be removed by vacuum annealing. Furthermore, the C-V curves contradict the idea of movement of the dopant ions.
    Źródło:
    Acta Physica Polonica A; 1998, 94, 3; 545-548
    0587-4246
    1898-794X
    Pojawia się w:
    Acta Physica Polonica A
    Dostawca treści:
    Biblioteka Nauki
    Artykuł
    Tytuł:
    Effect of Winter Cover Crop Biomass on Summer Weed Emergence and Biomass Production
    Autorzy:
    Bittencourt, H.H.
    Lovato, P.E.
    Comin, J.J.
    Lana, M.A.
    Altieri, M.A.
    Costa, M.D.
    Gomes, J.C.
    Powiązania:
    https://bibliotekanauki.pl/articles/65024.pdf
    Data publikacji:
    2013
    Wydawca:
    Polska Akademia Nauk. Czytelnia Czasopism PAN
    Opis:
    A greenhouse assay was carried out to evaluate the effect of winter cover crop residues on spontaneous plants that commonly occur on summer annual fields in Southern Brazil. Dry shoot residues of rye (Secale cereale), vetch (Vicia villosa), fodder radish (Raphanus sativus), and a mix of the three species, were applied over pots that had been seeded with alexandergrass (Brachiaria plantaginea), hairy beggarticks (Bidens pilosa), wild poinsettia (Euphorbia heterophylla), and morning glory (Ipomoea grandifolia) at four different depths (0, 1, 2, or 4 cm). Plant emergence and biomass production were measured. Residues of rye reduced the emergence of B. plantaginea, while vetch diminished I. grandifolia and B. plantaginea emergence. Fodder radish reduced emergence of I. grandifolia. The mix of cover crops reduced emergence of I. grandifolia, B. plantaginea, and B. pilosa. None of the cover crops differed from the control on E. heterophylla emergence. The lowest yields in spontaneous plant shoot biomass were obtained from the cover with rye + vetch + fodder radish. The lowest values of root biomass occurred under cover with rye, fodder radish or the mix. Use of vetch residues decreased emergence of B. plantaginea and I. grandifolia, but enhanced biomass accumulation by the latter.
    Źródło:
    Journal of Plant Protection Research; 2013, 53, 3
    1427-4345
    Pojawia się w:
    Journal of Plant Protection Research
    Dostawca treści:
    Biblioteka Nauki
    Artykuł
    Tytuł:
    Stratigraphy, palynology and organic geochemistry of the Devonian-Mississippian metasedimentary Albergaria-a-Velha Unit (Porto-Tomar shear zone, W Portugal)
    Autorzy:
    Machado, G.
    Francu, E.
    Vavrdová, M.
    Flores, D.
    Fonseca, P. E.
    Rocha, F. T.
    Pereira, L. C. G.
    Gomes, A.
    Fonseca, M.
    Chaminé, H.
    Powiązania:
    https://bibliotekanauki.pl/articles/2059150.pdf
    Data publikacji:
    2011
    Wydawca:
    Państwowy Instytut Geologiczny – Państwowy Instytut Badawczy
    Tematy:
    Mississippian
    Late Devonian
    Ossa-Morena Zone
    Porto-Tomar shear zone
    palynology
    organic geochemistry
    Opis:
    The Albergaria-a-Velha Unit is one of several tectonostratigraphic out-of-sequence units of the metamorphic belt associated with the Porto-Tomar shear zone (Ossa-Morena Zone, W Portugal). It is composed of considerably deformed - very low grade - metasediments, namely shales, siltstones and rare fine sandstones. In this work we present new sedimentological and biostratigraphical data that suggest the Albergaria-a-Velha Unit was deposited from the (?)early Frasnian to the Serpukhovian in a distal marine environment, where turbiditic and basinal sedimentation prevailed. Palynofacies analysis and lithological data point to a gradual increase of terrestrial input, suggesting a prograding system. Detrital framework data is indicative of a stable cratonic sediment source area composed of low grade metamorphic rocks. The timing of the onset of the Porto-Tomar shear zone activity and consequently its influence on the sedimentation of this unit is discussed. Organic petrology and geochemistry data indicate that the Albergaria-a-Velha Unit is within the dry gas window in terms of hydrocarbon generation ranges.
    Źródło:
    Geological Quarterly; 2011, 55, 2; 139-164
    1641-7291
    Pojawia się w:
    Geological Quarterly
    Dostawca treści:
    Biblioteka Nauki
    Artykuł
    Tytuł:
    Serological and molecular evidence of hepadnavirus infection in swine
    Autorzy:
    Vieira, Y.R.
    Silva, M.F.M.
    Santos, D.R.L.
    Vieira, A.A.
    Ciacci-Zanella, J.R.
    Barquero, G.
    do Lago, B.V.
    Gomes, S.A.
    Pinto, M.A.
    de Paula, V.S.
    Powiązania:
    https://bibliotekanauki.pl/articles/989989.pdf
    Data publikacji:
    2015
    Wydawca:
    Instytut Medycyny Wsi
    Tematy:
    diagnostic
    hepadnavirus
    swine
    Opis:
    Introduction and objective. Recently, investigations in a swine herd identified evidence of the existence of a novel member of the Hepadnavirus family endemic in swine. The aim of this study was to investigate the serological and molecular markers of Hepadnavirus circulation in Brazilian domestic swine and wild boar herds, and to evaluate the identity with HBV and other Hepadnaviruses reported previously. Materials and methods. For the study, 376 swine were screened for hepatitis B virus serological markers. Analyses were performed in serum samples using commercial enzyme-linked immunosorbent assay (ELISA) kits (DiaSorin®) for anti-HBc, HBsAg and anti-HBs. Reactive and undetermined swine serum samples were selected to perform DNA viral extraction (QIAamp DNA Mini Kit, Qiagen®), partial genome amplification and genome sequencing. Results. From 376 swine samples analysed, 28 (7.45%) were reactive to anti-HBc, 3 (0.80%) to HBsAg and 6 (1.6%) to anti-HBs. Besides, more 17 (4.52%) swine samples analyzed were classified in the grey zone of the EIA test to anti-HBc and 2 (0.53%) to HBsAg. From 49 samples molecularly analyzed after serological trial, 4 samples showed a positive result for the qualitative PCR for Hepadnavirus. Phylogenetic reconstruction using partial genome sequencing (360 bp) of 3 samples showed similarity with HBV with 90.8–96.3% of identity. Conclusions. Serological and molecular data showed evidence of the circulation of a virus similar to hepatitis B virus in swine.
    Źródło:
    Annals of Agricultural and Environmental Medicine; 2015, 22, 1
    1232-1966
    Pojawia się w:
    Annals of Agricultural and Environmental Medicine
    Dostawca treści:
    Biblioteka Nauki
    Artykuł
    Tytuł:
    Processing and Performance of Blended Biodiesel Produced from Microalgae Pediastrum Boryanum
    Autorzy:
    Chellappa, Thiago
    da Silva, Raphael Eliedson
    Filgueira, Mário Sérgio Gomes
    Rabelo, Daniela Aisha Silva de Souza
    Lira, Isadora Patriota de Aguiar
    Bremgartner, Afra Raquel de Almeida
    Bragato, Marcos
    Santos, Dino Lincoln Figueirôa
    Rosa, José Guilherme da Silva Santa
    Chellappa, Naithirithi T.
    Sanábio, Robson Guimarães
    Nascimento, Rubens M.
    Powiązania:
    https://bibliotekanauki.pl/articles/2069909.pdf
    Data publikacji:
    2021
    Wydawca:
    Politechnika Koszalińska. Wydawnictwo Uczelniane
    Tematy:
    biodiesel
    diesel
    algae
    esterification
    transesterification
    residue
    Opis:
    In this present study, biodiesel was synthesized as per ASTM method by using algae as a raw material, which in the environment is considered as being a harmful waste and of a nature that blooms in ponds, lakes and reservoirs. In order to improve fuel quality, the transesterification process was carried out in this study so as to remove fatty acids and thereafter, analyze several fuel parameters of the biodiesel were determined. The calorific value of the biodiesel and its specific gravity was 42660 kJ/kg and 0.803 g/cm3 respectively. The viscosity of the sample was found to be 1.99. The cetane number of diesel fuel ranged from 40 to 55 and for the biodiesel it was found to be 47. The flashpoint and firepoint of the sample was recorded as 80°C and 94°C respectively. The conclusion is that it is worthy to mention that this process does not require high-end technology; hence, it could be used in the energy generation process in remote areas and as an alternative resource, as well.
    Źródło:
    Rocznik Ochrona Środowiska; 2021, 23; 243--262
    1506-218X
    Pojawia się w:
    Rocznik Ochrona Środowiska
    Dostawca treści:
    Biblioteka Nauki
    Artykuł
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