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    Wyświetlanie 1-9 z 9
    Tytuł:
    Navigation and mapping of closed spaces with a mobile robot and RFID grid
    Autorzy:
    Pawłowicz, Bartosz
    Skoczylas, Mariusz
    Trybus, Bartosz
    Salach, Mateusz
    Hubacz, Marcin
    Mazur, Damian
    Powiązania:
    https://bibliotekanauki.pl/articles/27324009.pdf
    Data publikacji:
    2023
    Wydawca:
    Polska Akademia Nauk. Czasopisma i Monografie PAN
    Tematy:
    mobile robot
    space mapping
    RFID
    Opis:
    This article concerns the use of an integrated RFID system with a mobile robot for the navigation and mapping of closed spaces. The architecture of a prototype mobile robot equipped with a set of RFID readers that performs the mapping functions is described. Laboratory tests of the robot have been carried out using a test stand equipped with a grid of appropriately programmed RFID transponders. A simulation model of the effectiveness of transponder reading by the robot has been prepared. The conclusions from measurements and tests are discussed, and methods for improving the solution are proposed.
    Źródło:
    Archives of Control Sciences; 2023, 33, 4; 737--759
    1230-2384
    Pojawia się w:
    Archives of Control Sciences
    Dostawca treści:
    Biblioteka Nauki
    Artykuł
    Tytuł:
    Analiza modernizacji domu rekolekcyjnego z uwzględnieniem aspektów energetycznych, ekonomicznych i prawnych
    Analysis of modernization of retreat house considering energetics, environmental and social aspects
    Autorzy:
    Mazur, Mateusz
    Powiązania:
    https://bibliotekanauki.pl/articles/1203403.pdf
    Data publikacji:
    2018
    Wydawca:
    Politechnika Śląska. Wydział Inżynierii Środowiska i Energetyki. Instytut Techniki Cieplnej
    Tematy:
    modernizacja
    źródła ciepła
    Purmo OZC
    dom rekolekcyjny
    modernization
    Purmo
    retreat house
    Opis:
    Analiza domu rekolekcyjnego opiera się na modelu wykonanym w programie Purmo -Audytor OZC 6.7 basic. W tym programie została obliczona projektowa strata ciepła i sezonowe zapotrzebowanie na ciepło. Wyniki te stanowią punkt wyjścia do dalszej analizy mającej na celu poprawę aspektu energetycznego budynku oraz dobór źródeł ciepła. Dodatkowo zostały również obliczone straty energii przez przegrody płaskie. Model budynku analizowany i porównywany jest w siedmiu wariantach, które obejmują m.in. zwiększenie grubości izolacji ścian zewnętrznych, wymianę okien i wymianę drzwi, zwiększenie grubości izolacji dachu oraz dom w pełni zmodernizowany. Źródła ciepła wybrane są z uwzględnieniem aspektu środowiskowego i porównywane ze względu na koszty inwestycyjnei eksploatacyjne. Wybrane źródła ciepła dotyczą pompy ciepła o mocy 13 kW współpracującej z kotłem gazowym, pompy ciepła o mocy40 kW oraz pompy ciepła o mocy 52 kW. Wzięto pod uwagę także próżniowe kolektory słoneczne w liczbie dziesięciu sztuk -pięć z nich znajduje się na wschodniej części dachu i pięć na zachodniej części. Porównanie kosztów eksploatacyjnych odbywa się z uwzględnieniem każdego wariantu modernizacji.Analiza kolektorów słonecznych wykonana została, aby pokazać jaką część zapotrzebowania na ciepło są one wstanie pokryć. Dopełnieniem analizy kosztów eksploatacyjnych jest porównanie, które dotyczy także różnych typów ogrzewania -podłogowego i grzejnikowego.Najlepszy wariant modernizacji pozwala zmniejszyć stratę ciepła o 55 GJ w skali roku. Zakładając, że pompa ciepła ma współczynnik COP równy 4, a cena kWh energii elektrycznej wynosi 0,55 PLN, daje to oszczędność około 2000 zł rocznie.
    The retreat house analysis is based on a model made in Purmo -Audytor OZC 6.7 basic. In this program, the design heat loss and seasonal heat demand were calculated. These results provide a starting point for further analysis aimed at improving the energy aspect of the building and selection of heat sources. In addition, exergy losses have also been calculated.To make the analyse more specific seven variants of modernization were addedsuch as increasing thickness of insulation of walls, windows and doors replacement, increasing thickness of insulation of the roof and finally whole modernization of the building.There are also specified types of heating for the source heats -floor heating and radiator heating.After calculating the heat losses heat sources were chosensuch as heat pump-13 kW, 40 kW and 52 kW, gaseous furnace and solar collectors. Heat sources are selected taking into account the environmental aspect and compared due to the investment and operating costs.The sources of heat are also compared in different modernization variants.It is worth adding the heat pump 13 kW cooperates with gaseous furnace to meet the energetic demand of the retreat house and it is the most profitable choice for the radiator heating considering exploitation aspect.There are ten evacuated tube solar collectors -five are situated on the west part of roof and the rest is on the east part of roof. They are only analysed to show the amount of heat demand that they can cover.In order to complete the analysis of operating costs, the comparison also applies to various types of heating -floor and radiator.It is calculated the best variant of modernization can decrease the demand for heat up to 55 GJ per year. Assuming the heat pump’s COP is 4 and one kWh of electric energy cost 0,55 PLN about 2000 PLN can be saved per year. The best modernization combination can save about 8100 PLN per year considering exploitation aspect.The most expensive investment solutions are not always cheap in operation. The most expensive in terms of investment are 40 kW and 52 kW heat pumps. They bring operational benefits only in the underfloor heating option. In the radiator heating option, the most advantageous in terms of operation is a 13 kW heat pump cooperating with a gas boiler. However, the cheapest investment that meets the energy requirements of the building is the installation of a gaseous furnace.
    Źródło:
    Archiwum Instytutu Techniki Cieplnej; 2018, 4; 85-105
    2451-277X
    Pojawia się w:
    Archiwum Instytutu Techniki Cieplnej
    Dostawca treści:
    Biblioteka Nauki
    Artykuł
    Tytuł:
    On the Empirical Importance of Periodicity in the Volatility of Financial Returns - Time Varying GARCH as a Second Order APC(2) Process
    Autorzy:
    Mazur, Błażej
    Pipień, Mateusz
    Powiązania:
    https://bibliotekanauki.pl/articles/483329.pdf
    Data publikacji:
    2012
    Wydawca:
    Polska Akademia Nauk. Czytelnia Czasopism PAN
    Tematy:
    GARCH models
    Bayesian inference
    periodically correlated stochastic processes
    volatility
    unconditional variance
    Opis:
    We discuss the empirical importance of long term cyclical effects in the volatility of financial returns. Following Amado and Terasvirta (2009), Cizek and Spokoiny (2009) and others, we consider a general conditionally heteroscedastic process with stationarity property distorted by a deterministic function that governs the possible time variability of the unconditional variance. The function proposed in this paper can be interpreted as a finite Fourier approximation of an Almost Periodic (AP) function as defined by Corduneanu (1989). The resulting model has a particular form of a GARCH process with time varying parameters, intensively discussed in the recent literature. In the empirical analyses we apply a generalisation of the Bayesian AR(1)-GARCH model for daily returns of S&P500, covering the period of sixty years of US postwar economy, including the recently observed global financial crisis. The results of a formal Bayesian model comparison clearly indicate the existence of significant long term cyclical patterns in volatility with a strongly supported periodic component corresponding to a 14 year cycle. Our main results are invariant with respect to the changes of the conditional distribution from Normal to Student-t and to the changes of the volatility equation from regular GARCH to the Asymmetric GARCH.
    Źródło:
    Central European Journal of Economic Modelling and Econometrics; 2012, 4, 2; 95-116
    2080-0886
    2080-119X
    Pojawia się w:
    Central European Journal of Economic Modelling and Econometrics
    Dostawca treści:
    Biblioteka Nauki
    Artykuł
    Tytuł:
    Polymetamorphic evolution of pelites inferred from tourmaline zoning – the Rędziny hornfels case study at the eastern contact of the Karkonosze Granite, Sudetes, Poland
    Autorzy:
    Majka, Jarosław
    Sęk, Mateusz P.
    Mazur, Stanisław
    Gołębiowska, Bożena
    Pieczka, Adam
    Powiązania:
    https://bibliotekanauki.pl/articles/127560.pdf
    Data publikacji:
    2018
    Wydawca:
    Polskie Towarzystwo Mineralogiczne
    Tematy:
    contact metamorphism
    tourmaline
    Ti-in biotite
    Karkonosze-Izera Massif
    Bohemian Massif
    Opis:
    Tourmaline occurring in hornfelses from the eastern envelope of the Karkonosze Granite (Western Sudetes, Poland) reveals at least two stages of crystallization expressed by its complex zoning. The cores and mantles of the crystals probably grew during prograde metamorphism under intermediate pressure-temperature conditions reflected by increasing Mg, Ti and Ca. Outermost rims show enrichment in Al and Ca, indicating growth during contact metamorphism in the presence of an Al-saturating phase. The Ti-content in biotite indicates that the temperature of the contact metamorphic event did not exceed 650ºC. The presence of andalusite and the lack of garnet and cordierite also indicates pressure conditions of ~ 2-3 kbar, typical of the C1 bathozone of Carmichael (1978) or the P1 bathozone of Pattison (2001).
    Źródło:
    Mineralogia; 2018, 49, 1/4; 17-34
    1899-8291
    1899-8526
    Pojawia się w:
    Mineralogia
    Dostawca treści:
    Biblioteka Nauki
    Artykuł
    Tytuł:
    STATISTICAL ANALYSIS OF BUSINESS CYCLE FLUCTUATIONS IN POLAND BEFORE AND AFTER THE CRISIS
    Autorzy:
    Lenart, Łukasz
    Mazur, Błażej
    Pipień, Mateusz
    Powiązania:
    https://bibliotekanauki.pl/articles/517281.pdf
    Data publikacji:
    2016
    Wydawca:
    Instytut Badań Gospodarczych
    Tematy:
    APC processes
    subsampling
    Bayesian inference
    global economic crisis
    business cycle fluctuations
    Opis:
    The main objective of the paper is to investigate properties of business cycles in the Polish economy before and after the recent crisis. The essential issue addressed here is whether there is statistical evidence that the recent crisis has affected the properties of the business cycle fluctuations. In order to improve robustness of the results, we do not confine ourselves to any single inference method, but instead use different groups of statistical tools, including non-parametric methods based on subsampling and parametric Bayesian methods. We examine monthly series of industrial production (from January 1995 till December 2014), considering the properties of cycles in growth rates and in deviations from long-run trend. Empirical analysis is based on the sequence of expanding-window samples, with the shortest sample ending in December 2006. The main finding is that the two frequencies driving business cycle fluctuations in Poland correspond to cycles with periods of 2 and 3.5 years, and (perhaps surprisingly) the result holds both before and after the crisis. We, therefore, find no support for the claim that features (in particular frequencies) that characterize Polish business cycle fluctuations have changed after the recent crisis. The conclusion is unanimously supported by various statistical methods that are used in the paper, however, it is based on relatively short series of the data currently available.
    Źródło:
    Equilibrium. Quarterly Journal of Economics and Economic Policy; 2016, 11, 4; 769-783
    1689-765X
    2353-3293
    Pojawia się w:
    Equilibrium. Quarterly Journal of Economics and Economic Policy
    Dostawca treści:
    Biblioteka Nauki
    Artykuł
    Tytuł:
    The pollution of surface water in the agricultural catchment against the background of agrarian structure and production intensity
    Autorzy:
    Lach, Stanisław K.
    Kowalczyk, Agnieszka
    Kopacz, Marek T.
    Kowalewski, Zbigniew
    Jakubiak, Mateusz
    Mazur, Robert
    Grabowska-Polanowska, Beata
    Powiązania:
    https://bibliotekanauki.pl/articles/2203557.pdf
    Data publikacji:
    2023
    Wydawca:
    Instytut Technologiczno-Przyrodniczy
    Tematy:
    agrarian structure
    intensive agricultural production
    land use
    surface water quality
    Szreniawa River catchment
    Opis:
    The intensification of agricultural production is one of the factors determining economic development. Increasing mechanisation and use of fertilisers in agriculture lead to higher yields, but at the same time they can pose a threat to the environment. The overuse of chemical fertilisers contributes to increased concentration of nutrients in agricultural runoff. One of such areas is the Szreniawa River catchment, the study area located in the southern part of Poland. In this catchment, intensive mostly mechanical ploughing is applied in, for instance, vegetable production. The area has loess soils, which with intensive ploughing are susceptible to erosion. The study aims to determine changes in the quality of flowing waters against the background of agricultural production and land-use characteristics. Surface waters were classified as class II and occurred at all analysed points. The highest concentrations of N-NO3 , N-NH 4 and P-PO 4 were found at a point in the middle of the catchment (lower part of research area). There, the lowest concentrations were recorded in 2018, which was related to the amount of precipitation during the growing season. On the other hand, the volume of plant and animal production closely correlated with the quality of surface water in the area. This was also confirmed by the land use structure. In conclusion, intensive agricultural production, mainly in terms of plough tillage causes significant hazards associated with soil erosion especially on agriculturally sensitive soils, although it provides good yields.
    Źródło:
    Journal of Water and Land Development; 2023, 56; 242--248
    1429-7426
    2083-4535
    Pojawia się w:
    Journal of Water and Land Development
    Dostawca treści:
    Biblioteka Nauki
    Artykuł
      Wyświetlanie 1-9 z 9

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