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    Wyświetlanie 1-6 z 6
    Tytuł:
    Macro determinants of the income underreporting by the self-employed
    Autorzy:
    Adamczyk, Adam
    Powiązania:
    https://bibliotekanauki.pl/articles/2128508.pdf
    Data publikacji:
    2020
    Wydawca:
    Uniwersytet w Białymstoku. Wydawnictwo Uniwersytetu w Białymstoku
    Tematy:
    self-employment
    income underreporting
    taxation
    Opis:
    Purpose - The aim of the article is to indicate the macro factors shaping the phenomenon of concealing income by self-employed workers. Research method - This article uses the comparative analysis method together with an analysis of critical literature. The empirical element employs dependency analysis methods. Results - The conducted analyses indicate the lack of a relationship between the level of economic development of the state and the scale of the phenomenon of income concealment. Similarly, it has been demonstrated that there is no evidence of a correlation between the level of unemployment and the rate of self-employment and the scale of income concealment by self-employed people. The results of the conducted analyses allowed the identification of two paradoxes. The first consists in the existence of a negative relationship between the scale of income concealment and the size of the grey economy, while the second consists in the occurrence of a positive relationship between the friendliness of the tax system for entrepreneurs and the scale of lowering the tax base. Originality /value / implications /recommendations - The article supplements an existing research gap. The research undertaken thus far concerned the analysis of factors influencing the international diversity of the grey sphere size. However, no detailed analysis was carried out regarding the impact of macro factors on the shaping of the grey economy, including the lowering of incomes by self-employed workers. The original contribution of the article is also the study of the relationship between the size of the phenomenon of income understatement and the size of the grey economy.
    Źródło:
    Optimum. Economic Studies; 2020, 4(102); 15-26
    1506-7637
    Pojawia się w:
    Optimum. Economic Studies
    Dostawca treści:
    Biblioteka Nauki
    Artykuł
    Tytuł:
    Zombies or Still Alive. Who Took Advantage of COVID-19 State Aid?
    Autorzy:
    Wiśniewski, Tomasz
    Adamczyk, Adam
    Franek, Sławomir
    Powiązania:
    https://bibliotekanauki.pl/articles/2168374.pdf
    Data publikacji:
    2022
    Wydawca:
    Uniwersytet Marii Curie-Skłodowskiej. Wydawnictwo Uniwersytetu Marii Curie-Skłodowskiej
    Tematy:
    public aid
    COVID-19
    financial performance
    Opis:
    Theoretical background: The SARS-CoV-2 pandemic has caused violent reactions from the governments of almost all countries in the world. The attempt to contain a pandemic by restricting the mobility of society has had a huge impact on people and some businesses. As a result of COVID-19 restrictions, it became necessary to introduce special state aid programs for those businesses that were most affected by these restrictions. This was also the case in Poland. We based our analysis on welfare economics (Harberger, 1971), in which government support for enterprises is legitimized when their situation would have been worse without these interventions.Purpose of the article: The aim of this article is to assess the impact of public aid granted to large companies in Poland on their financial condition. The research problem is to answer the question whether the companies that received the aid needed it. In assessing the appropriateness of aid, liquidity, debt level and profitability indices were used, which directly resulted from the objectives of COVID-19 aid granted in Poland. The added value of the study is combining the analysis of data from financial statements with information on state aid published by the Office of Competition and Consumer Protection (UOKiK).Research methods: The research sample consisted of 1,201 large Polish enterprises from the non-financial sector. The study used non-parametric statistical tests and quartile analysis.Main findings: The results show that the aid went to entities that were already in a worse financial situation before the pandemic. At the same time, it was demonstrated that the aid did not distort the market mechanism, i.e. it neither excessively improved the situation of supported entities nor significantly worsened the situation of entities that did not benefit from the aid.
    Źródło:
    Annales Universitatis Mariae Curie-Skłodowska, sectio H – Oeconomia; 2022, 56, 2; 149-163
    0459-9586
    2449-8513
    Pojawia się w:
    Annales Universitatis Mariae Curie-Skłodowska, sectio H – Oeconomia
    Dostawca treści:
    Biblioteka Nauki
    Artykuł
    Tytuł:
    Comparison of multiband filtering, empirical mode decomposition and short-time fourier transform used to extract physiological components from long-term heart rate variability
    Autorzy:
    Adamczyk, Krzysztof
    Polak, Adam G.
    Powiązania:
    https://bibliotekanauki.pl/articles/2052173.pdf
    Data publikacji:
    2021
    Wydawca:
    Polska Akademia Nauk. Czytelnia Czasopism PAN
    Tematy:
    heart rate variability
    nonstationary signal analysis
    multiband filtering
    empirical mode decomposition
    short-time Fourier transform
    Hilbert transform
    Opis:
    Heart rate is constantly changing under the influence of many control signals, as manifested by heart rate variability (HRV). HRV is a nonstationary, irregularly sampled signal, the spectrum of which reveals distinct bands of high, low, very low and ultra-low frequencies (HF, LF, VLF, ULF). VLF and ULF components are the least understood, and their analysis requires HRV records lasting many hours. Moreover, there are still no well-established methods for the reliable extraction of these components. The aim of this work was to select, implement and compare methods which can solve this problem. The performance of multiband filtering (MBF), empirical mode decomposition and the short-time Fourier transform was tested, using synthetic HRV as the ground truth for methods evaluation as well as real data of three patients selected from 25 polysomnographic records with a clear HF component in their spectrograms. The study provided new insights into the components of long-term HRV, including the character of its amplitude and frequency modulation obtained with the Hilbert transform. In addition, the reliability of the extracted HF, LF, VLF and ULF waveforms was demonstrated, and MBF turned out to be the most accurate method, though the signal is strongly nonstationary. The possibility of isolating such waveforms is of great importance both in physiology and pathophysiology, as well as in the automation of medical diagnostics based on HRV.
    Źródło:
    Metrology and Measurement Systems; 2021, 28, 4; 643-660
    0860-8229
    Pojawia się w:
    Metrology and Measurement Systems
    Dostawca treści:
    Biblioteka Nauki
    Artykuł
    Tytuł:
    Areas of Investigation into Air Intake Systems for the Impact on Compressor Performance Stability in Aircraft Turbine Engines
    Autorzy:
    Kozakiewicz, Adam
    Adamczyk, Maciej
    Wróblewski, Mirosław
    Powiązania:
    https://bibliotekanauki.pl/articles/2067549.pdf
    Data publikacji:
    2022
    Wydawca:
    Stowarzyszenie Inżynierów i Techników Mechaników Polskich
    Tematy:
    mechanical engineering
    aviation
    aircraft engines
    compressor stall
    compressors
    Opis:
    The high demands placed on aircraft turbine engines necessitate the use of the latest engine compressors which must be increasingly efficient and more robust due to the increased loads. The key safety issue in this context is to ensure compressor stability over all engine speed ranges and aircraft flight regimes. This paper presents selected areas of research into surge and stall of axial compressors used in aircraft turbine engines based on scientific publications in recent years. On the basis of the analysed literature the authors defined the main research areas into compressor surge, namely: air intake research, compressor research and combined air intake and compressor system research. On the background of the conducted analysis the authors has presented their own areas of research. The aim of this work is to search for an intake-compressor design more passively resistant to stall or surge phenomena without necessity of implementation of complex control systems to prevent compressor stall.
    Źródło:
    Advances in Science and Technology. Research Journal; 2022, 16, 1; 62--74
    2299-8624
    Pojawia się w:
    Advances in Science and Technology. Research Journal
    Dostawca treści:
    Biblioteka Nauki
    Artykuł
    Tytuł:
    Determination of Ranges of Unstable Operation of Axial Compressor for Aircraft Turbine Engines
    Wyznaczanie zakresów niestatecznej pracy sprężarki osiowej lotniczych silników turbinowych
    Autorzy:
    Kozakiewicz, Adam
    Adamczyk, Maciej
    Majcher, Maciej
    Powiązania:
    https://bibliotekanauki.pl/articles/2073829.pdf
    Data publikacji:
    2022
    Wydawca:
    Wojskowa Akademia Techniczna im. Jarosława Dąbrowskiego
    Tematy:
    mechanical engineering
    aviation
    aircraft engines
    stall
    compressor
    inżynieria mechaniczna
    lotnictwo
    silniki lotnicze
    pompaż
    sprężarki
    Opis:
    Currently, strict requirements are set for aircraft turbine engine performance, which requires introducing larger, more complex, and more loaded compressors. In sub-assemblies designed in this manner, a vital challenge is to maintain stable compressor operation across wide range of operating conditions. This article presents the results of analysis and estimation of the range of unstable operation of an example axial compressor for a turbofan jet engine with high mass flow ratio. The analyses and numerical simulations performed made it possible to estimate the limit performance for compressor operation for two particularly important phases of flight.
    Współcześnie stawia się wysokie wymagania wobec parametrów osiąganych przez lotnicze silniku turbinowe, co powoduje konieczność wprowadzania do konstrukcji coraz większych, bardziej skomplikowanych i obciążonych sprężarek. W tak projektowanych podzespołach istotnym wyzwaniem jest zachowanie stabilności pracy sprężarki w szerokim zakresie warunków operacyjnych. W niniejszym artykule przedstawiono wyniki analizy i oszacowania zakresu niestatecznej pracy przykładowej sprężarki osiowej do dwuprzepływowego silnika turbinowego o dużym stopniu podziału masowego natężenia przepływu. Przeprowadzone analizy i obliczenia pozwoliły na oszacowanie granicznych parametrów pracy sprężarki dla dwóch szczególnie istotnych faz lotu samolotu.
    Źródło:
    Problemy Mechatroniki : uzbrojenie, lotnictwo, inżynieria bezpieczeństwa; 2022, 13, 1 (47); 45--56
    2081-5891
    Pojawia się w:
    Problemy Mechatroniki : uzbrojenie, lotnictwo, inżynieria bezpieczeństwa
    Dostawca treści:
    Biblioteka Nauki
    Artykuł
    Tytuł:
    Automaton for acorns scarification – kinematic and strength calculations of selected components
    Analiza kinematyczna i wytrzymałościowa wybranych podzespołów automatu do skaryfikacji żołędzi
    Autorzy:
    Szaroleta, Michał
    Adamczyk, Florian
    Szczepaniak, Jan
    Tadeusiewicz, Ryszard
    Jabłoński, Mirosław
    Piłat, Adam
    Tylek, Paweł
    Walczyk, Józef
    Juliszewski, Tadeusz
    Kiełbasa, Paweł
    Powiązania:
    https://bibliotekanauki.pl/articles/336504.pdf
    Data publikacji:
    2019
    Wydawca:
    Sieć Badawcza Łukasiewicz - Przemysłowy Instytut Maszyn Rolniczych
    Tematy:
    acorn
    scarification
    kinematic analyze
    dynamic analyze
    vibrations
    żołędzie
    skaryfikacja
    analiza kinematyczna
    analiza dynamiczna
    drgania
    Opis:
    The computer model of the scarification machine was created at the Industrial Institute of Agricultural Engineering in Poznań with the participation of employees from the AGH University of Science and Technology in Krakow and the University of Agriculture in Krakow. The automaton is the result of the project, which aim was to develop, build and test an automatic device used to carry out the scarification of oak seeds for later shortening and balancing of germination period and elimination of sick and spoiled seeds. The paper presents the results of kinematic and strength analyzes of selected elements of the research model of a scarifying machine - the course of the peripheral speed, acceleration, torque and stress generated during the rotation of the arm.
    Komputerowy model automatu do skaryfikacji powstał w Przemysłowym Instytucie Maszyn Rolniczych w Poznaniu przy współudziale pracowników z Akademii Górniczo-Hutniczej w Krakowie oraz Uniwersytetu Rolniczego w Krakowie. Automat ten jest efektem zrealizowania projektu, którego celem było opracowanie, zbudowanie i przetestowanie automatycznego urządzenia służącego do prowadzenia skaryfikacji nasion dębu w celu późniejszego skrócenia i wyrównania okresu kiełkowania oraz eliminacji chorych i zepsutych nasion. W pracy przedstawiono wyniki przeprowadzonych analiz kinematycznych i wytrzymałościowych wybranych elementów modelu badawczego automatu skaryfikującego – przebieg wartości prędkości obwodowej, przyspieszenia, momentu obrotowego oraz naprężenia generowanych podczas obrotu ramienia.
    Źródło:
    Journal of Research and Applications in Agricultural Engineering; 2019, 64, 2; 60-64
    1642-686X
    2719-423X
    Pojawia się w:
    Journal of Research and Applications in Agricultural Engineering
    Dostawca treści:
    Biblioteka Nauki
    Artykuł
      Wyświetlanie 1-6 z 6

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