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Wyszukujesz frazę "Gapinski, A. J." wg kryterium: Autor

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    Wyświetlanie 1-12 z 12
    Tytuł:
    The Role of Renewable Energy Sources in USA Energy Production – Part I
    Autorzy:
    Gapinski, A. J.
    Powiązania:
    https://bibliotekanauki.pl/articles/409556.pdf
    Data publikacji:
    2016
    Wydawca:
    Politechnika Poznańska. Wydawnictwo Politechniki Poznańskiej
    Tematy:
    renewable energy
    energy resources
    Opis:
    The article analyzes the present role of renewable energy resources in U.S. energy production including Pennsylvania. Comparisons are being made to European Union (EU-27) block, the Organization for Economic Co-operation and Development (OECD) block, and some developing and third world countries. Classification of main energy resources and their trends in the USA energy production is provided. Renewable energy resources are analyzed and their contribution to the USA energy balance is described.
    Źródło:
    Research in Logistics & Production; 2016, 6, 5; 419-428
    2083-4942
    2083-4950
    Pojawia się w:
    Research in Logistics & Production
    Dostawca treści:
    Biblioteka Nauki
    Artykuł
    Tytuł:
    The Role of Renewable Energy Sources in the USA Energy Production – Part II
    Autorzy:
    Gapinski, A. J.
    Powiązania:
    https://bibliotekanauki.pl/articles/409443.pdf
    Data publikacji:
    2016
    Wydawca:
    Politechnika Poznańska. Wydawnictwo Politechniki Poznańskiej
    Tematy:
    renewable energy
    energy resources
    Opis:
    The article analyzes the renewable energy resources in the USA including Pennsylvania. Contributions of the most important renewable technologies in energy production are described: solar power, wind energy, hydroelectric, nuclear, and geothermal. The contribution of other resources such as hydrogen and fuel cells, bio-energy resources due to their negligible level of impact is not addressed. Some aspects of political considerations affecting policies and regulations related to energy production in the USA and beyond are also addressed. Academia’s response to new demands for graduates in alternative and renewable energies with an example of academic engineering degree program is included.
    Źródło:
    Research in Logistics & Production; 2016, 6, 6; 523-535
    2083-4942
    2083-4950
    Pojawia się w:
    Research in Logistics & Production
    Dostawca treści:
    Biblioteka Nauki
    Artykuł
    Tytuł:
    Structure and Dynamics of Colloidal Suspensions Studied by Means of XPCS
    Autorzy:
    Patkowski, A.
    Gapinski, J.
    Fluerasu, A.
    Holmqvist, P.
    Meier, G.
    Lettinga, M.
    Nägele, G.
    Powiązania:
    https://bibliotekanauki.pl/articles/1812242.pdf
    Data publikacji:
    2008-08
    Wydawca:
    Polska Akademia Nauk. Instytut Fizyki PAN
    Tematy:
    87.15.Vv
    83.10.Mj
    82.70.Dd
    Opis:
    Structure and dynamics of suspensions of charged colloidal spheres in water were studied by means of small-angle X-ray scattering and X-ray photon correlation spectroscopy using synchrotron radiation. Experimentally obtained dependences on the scattering vector q of the structure factor S(q), short-time collective diffusion coefficient D(q) and hydrodynamic function H(q) were in good agreement with theoretical predictions. No effect of screening of the hydrodynamic interactions, suggested in the literature, was found. The conditions are discussed at which the maximum of the hydrodynamic function peak value H(q_m) can be obtained experimentally.
    Źródło:
    Acta Physica Polonica A; 2008, 114, 2; 339-350
    0587-4246
    1898-794X
    Pojawia się w:
    Acta Physica Polonica A
    Dostawca treści:
    Biblioteka Nauki
    Artykuł
    Tytuł:
    Raman Analysis of Zn$\text{}_{1-x}$Mg$\text{}_{x}$Se Layers Grown on GaAs and ZnTe Substrates
    Autorzy:
    Renucci, M. A.
    Frandon, J.
    Głowacki, G.
    Gapiński, A.
    Rozpłoch, F.
    Bała, W.
    Powiązania:
    https://bibliotekanauki.pl/articles/1952686.pdf
    Data publikacji:
    1996-11
    Wydawca:
    Polska Akademia Nauk. Instytut Fizyki PAN
    Tematy:
    78.30.-j
    Opis:
    A study of the Raman scattering in Zn$\text{}_{1-x}$Mg$\text{}_{x}$Se (0 ≤ x ≤ 0.4) epilayers grown by molecular beam epitaxy on (100) GaAs and (111)$\text{}_{Zn}$ ZnTe substrates has been performed. Two kinds of longitudinal optical phonon modes (LO$\text{}_{Zn-Se}$ and LO$\text{}_{Mg-Se}$) were observed under excitation of the Ar$\text{}^{+}$ and Kr$\text{}^{+}$ laser lines at room temperature, whose frequencies and intensities depend characteristically on the Mg content.
    Źródło:
    Acta Physica Polonica A; 1996, 90, 5; 1065-1069
    0587-4246
    1898-794X
    Pojawia się w:
    Acta Physica Polonica A
    Dostawca treści:
    Biblioteka Nauki
    Artykuł
    Tytuł:
    Piston assembly in the most powerful 2.0l diesel engine – case study of the current tribological system and innovative concepts for the future
    Autorzy:
    Kałużny, J.
    Merkisz, J.
    Stepanenko, A.
    Wróblewski, E.
    Gapiński, B.
    Piasecki, A.
    Gallas, D.
    Powiązania:
    https://bibliotekanauki.pl/articles/133301.pdf
    Data publikacji:
    2017
    Wydawca:
    Polskie Towarzystwo Naukowe Silników Spalinowych
    Tematy:
    piston engine
    powertrains development
    tribological system
    silnik tłokowy
    rozwój układów napędowych
    system tribologiczny
    Opis:
    This article is a contribution to the ongoing debate on the scenario of the vehicle powertrains development. The directions of the internal combustion engines development in search of the possibility of effective economic and ecological indicators improvement have been indicated. It has been pointed out that this goal can be achieved through the use of nanotechnology in order to exceed the downsizing barriers resulting from the permissible mechanical loads for conventional materials. The article presents the study of the construction and materials used in the piston assembly of the most advanced four-cylinder, compression-ignition diesel engine currently in manufacture. Original concepts of nanotechnology have been proposed to reduce friction losses in major friction components of future engines with extremely high loads. The main idea is to verify the hypothesis that the sub-micron surface texture of the friction components obtained in the process of applying anti-wear outer layers can lead to an effective reduction of friction losses under real engine operating conditions. Computer simulations of the effects of introducing the surface texture in the upper sealing ring on friction loss confirm this hypothesis by showing friction value being reduced by 3-4% relative to the standard ring profile. In the summary, further advanced technologies designed to effectively utilize the unique properties of carbon nanotubes have been described.
    Źródło:
    Combustion Engines; 2017, 56, 4; 127-133
    2300-9896
    2658-1442
    Pojawia się w:
    Combustion Engines
    Dostawca treści:
    Biblioteka Nauki
    Artykuł
    Tytuł:
    Morphology and surface topography of Ti6Al4V lattice structure fabricated by selective laser sintering
    Autorzy:
    Maszybrocka, J.
    Stwora, A.
    Gapiński, B.
    Skrabalak, G.
    Karolus, M.
    Powiązania:
    https://bibliotekanauki.pl/articles/202149.pdf
    Data publikacji:
    2017
    Wydawca:
    Polska Akademia Nauk. Czytelnia Czasopism PAN
    Tematy:
    metal porous implant
    selective laser sintering
    surface roughness
    X-ray microtomography
    selektywne spiekanie laserowe
    chropowatość powierzchni
    Mikrotomografia
    Opis:
    Construction of metallic implants with a porous structure that mimics the biomechanical properties of bone is one of the challenges of orthopedic regenerative medicine. The selective laser sintering technique (SLS) allows the production of complex geometries based on three-dimensional model, which offers the prospect of preparing porous metal implants, in which stiffness and porosity can be precisely adjusted to the individual needs of the patient. This requires an interdisciplinary approach to design, manufacturing and testing of porous structures manufactured by selective sintering. An important link in this process is the ability to assess the surface topography of the struts of porous structure. The paper presents a qualitative assessment of the surface morphology based on SEM studies and methodology that allows for quantitative assessment of stereometric structure based on micro-tomographic measurements.
    Źródło:
    Bulletin of the Polish Academy of Sciences. Technical Sciences; 2017, 65, 1; 85-92
    0239-7528
    Pojawia się w:
    Bulletin of the Polish Academy of Sciences. Technical Sciences
    Dostawca treści:
    Biblioteka Nauki
    Artykuł
    Tytuł:
    Modelling, manufacturability and compression properties of the CpTi grade 2 cellular lattice with radial gradient TPMS architecture
    Autorzy:
    Maszybrocka, J.
    Gapiński, B.
    Dworak, M.
    Skrabalak, G.
    Stwora, A.
    Powiązania:
    https://bibliotekanauki.pl/articles/201748.pdf
    Data publikacji:
    2019
    Wydawca:
    Polska Akademia Nauk. Czytelnia Czasopism PAN
    Tematy:
    selective laser sintering
    additive manufacturing
    cellular lattice
    triply periodic minimal surfaces
    mechanical properties
    Opis:
    In the present study, a titanium cellular lattice structure with a mathematical designed porosity gradient was successfully fabricated using the selective laser melting method. The samples with smooth gradient transition of porosity of between 60% and 80% were received for different elementary cell geometries. Elementary cells belong to the triply periodic minimal surfaces family (G, D, I2Y, IWP). Each sample was subjected to a comprehensive analysis including: dimensional metrology and assessment of material defects (X-ray micro-tomography), surface morphology tests (scanning electron microscopy) and mechanical properties (universal testing machine). It has been shown that a cellular lattice with high dimensional accuracy (+ 0.16/– 0.08 mm) and full dense struts can be obtained. According to the assumption, the gradient increases the strength of the cellular lattice samples. The highest increase in plateau stress between the samples with and without gradient was found for the I2Y series (about 185%). Furthermore, it was found that the stress-strain response of the samples depends not only on total porosity, but also on the 3D geometry of the cellular lattice. The stress-strain curves for G, IWP and I2Y samples are smooth and exhibit three characteristic regions: linear elasticity, plateau region and densification region. The size of regions depends on the geometric features of the cellular lattice. For series D, in the plateau region, the fluctuations in stress value are clearly visible. The smoothest stress-strain curve can be noted for the G series, which combined with good mechanical properties (the plateau stress and energy absorbed, at respectively 25.5 and 43.2 MPa, and 46.3J and 59.5J for Gyr_80 and Gyr_6080, which corresponds to a strain of almost 65% and 50%) positively affects the applicability of cellular structures with such geometry.
    Źródło:
    Bulletin of the Polish Academy of Sciences. Technical Sciences; 2019, 67, 4; 719-727
    0239-7528
    Pojawia się w:
    Bulletin of the Polish Academy of Sciences. Technical Sciences
    Dostawca treści:
    Biblioteka Nauki
    Artykuł
    Tytuł:
    Luminescence of Zn$\text{}_{x}$Mg$\text{}_{1-x}$Se Layers Obtained by Thermal Diffusion of Mg into ZnSe and Zn$\text{}_{x}$Mg$\text{}_{1-x}$Se Epilayers Grown by Molecular Beam Epitaxy
    Autorzy:
    Bała, W.
    Firszt, F.
    Głowacki, G.
    Gapiński, A.
    Dzik, J.
    Powiązania:
    https://bibliotekanauki.pl/articles/1931931.pdf
    Data publikacji:
    1995-01
    Wydawca:
    Polska Akademia Nauk. Instytut Fizyki PAN
    Tematy:
    78.55.Et
    78.20.Ci
    78.66.Hf
    Opis:
    This work deals with the study of photoluminescence properties of Zn$\text{}_{x}$Mg$\text{}_{1-x}$Se epilayers grown by molecular beam epitaxy on (001) GaAs and (111) ZnTe substrates and Zn$\text{}_{x}$Mg$\text{}_{1-x}$Se layers obtained by thermal diffusion of Mg into ZnSe single crystals. Luminescence spectra of Zn$\text{}_{x}$Mg$\text{}_{1-x}$Se layers are dominated by blue and violet emission bands with maxima positioned in the range of photon energies: 3.05-3.28 eV, 2.88-3.04 eV, 2.81 eV and 2.705 eV, depending on preparation conditions. In some samples the blue luminescence is observed up to room temperature.
    Źródło:
    Acta Physica Polonica A; 1995, 87, 1; 161-164
    0587-4246
    1898-794X
    Pojawia się w:
    Acta Physica Polonica A
    Dostawca treści:
    Biblioteka Nauki
    Artykuł
    Tytuł:
    Influence of temperature gradient on surface texture measurements with the use of profilometry
    Autorzy:
    Miller, T.
    Adamczak, S.
    Świderski, J.
    Wieczorowski, M.
    Łętocha, A.
    Gapiński, B.
    Powiązania:
    https://bibliotekanauki.pl/articles/201056.pdf
    Data publikacji:
    2017
    Wydawca:
    Polska Akademia Nauk. Czytelnia Czasopism PAN
    Tematy:
    profilometry
    surface topography
    temperature influence on measurements
    credibility
    profilometria
    topografia powierzchni
    wpływ temperatury na pomiary
    wiarygodność
    Opis:
    The paper presents an analysis of influence of ambient temperature changes on the values of parameters in topography measurements with the use of different profilometry techniques. In order to check this, a series of measurements was performed. Two multiprofilometry instruments were used - a contact profilometer, further equipped with an interferometric transducer, and an optical one with a confocal probe. Measurements were performed on first-class flat interferometric glass and on an A-type roughness standard - under different conditions, with simultaneous registration of differences in ambient temperature values. These values were either intentionally changed or the temperature variations were the result of air conditioning control. The performed research showed that - despite the asperities on the surface being really small - there is a relationship between changes of temperature and the results obtained from the measured surface, which in some cases can be seriously distorted.
    Źródło:
    Bulletin of the Polish Academy of Sciences. Technical Sciences; 2017, 65, 1; 53-62
    0239-7528
    Pojawia się w:
    Bulletin of the Polish Academy of Sciences. Technical Sciences
    Dostawca treści:
    Biblioteka Nauki
    Artykuł
    Tytuł:
    Friction reducing performance of carbon nanotubes covered pistons in internal combustion engines – engine test results
    Autorzy:
    Kałużny, J.
    Merkisz, J.
    Kempa, K.
    Gapiński, B.
    Wróblewski, E.
    Stepanenko, A.
    Al-Karawi, M.
    Powiązania:
    https://bibliotekanauki.pl/articles/133001.pdf
    Data publikacji:
    2018
    Wydawca:
    Polskie Towarzystwo Naukowe Silników Spalinowych
    Tematy:
    combustion engines
    piston
    carbon nanotubes
    friction
    silniki spalinowe
    tłok
    nanorurki węglowe
    tarcie
    Opis:
    This article discusses the posibility of reducing friction losses in internal combustion engines by using carbon nanotubes, pointing out the large potential of this application. Experimental pistons were made of standard aluminum alloy and coated with a layer of nanotube deposits by spraying them with an aqueous solution containing the binder. The proposed technology of applying layers of nanotubes can be adopted in industrial-scale production. Engine tests were carried out showing a significant reduction of the engine motoring torque, up to 16% for the experimental pistons, thus confirming the favorable tribological properties of nanotubes observed in tribological research and reported by many authors. Supplementary tests were carried out: SEM, EDS, coordinate measuring technique, and x-ray tomography. An alternative technology for hierarchical nanotube multilayer coatings electro-deposition was proposed.
    Źródło:
    Combustion Engines; 2018, 57, 1; 14-24
    2300-9896
    2658-1442
    Pojawia się w:
    Combustion Engines
    Dostawca treści:
    Biblioteka Nauki
    Artykuł
    Tytuł:
    Automation and its effect on STEM occupations. Economic and ethical impact
    Autorzy:
    Gapinski, A. J.
    Powiązania:
    https://bibliotekanauki.pl/articles/409383.pdf
    Data publikacji:
    2017
    Wydawca:
    Politechnika Poznańska. Wydawnictwo Politechniki Poznańskiej
    Tematy:
    automation
    workforce
    STEM
    Opis:
    The article discusses the effect of automation on occupations in general and more specifically on STEM jobs in the USA. The analysis considers characteristics of occupations and their classification into routine and non-routine tasks followed by the examination of occupations’ susceptibility to transformations due to advancements in computer technologies and resulting automation. STEM occupations and their various vulnerability to automation are discussed. Future trends which will affect STEM workforce of various industries are addressed. The socio-economic and ethical ramifications of the technological changes in the USA and beyond are discussed as well.
    Źródło:
    Research in Logistics & Production; 2017, 7, 5; 391-407
    2083-4942
    2083-4950
    Pojawia się w:
    Research in Logistics & Production
    Dostawca treści:
    Biblioteka Nauki
    Artykuł
    Tytuł:
    Accuracy of the element geometry mapping using non-invasive computer tomography method
    Autorzy:
    Grzelka, M.
    Marciniak, L.
    Gapinski, B.
    Budzik, G.
    Trafarski, A.
    Augustyn-Pieniazek, J.
    Gaca, M.
    Powiązania:
    https://bibliotekanauki.pl/articles/384351.pdf
    Data publikacji:
    2012
    Wydawca:
    Sieć Badawcza Łukasiewicz - Przemysłowy Instytut Automatyki i Pomiarów
    Tematy:
    computer tomography
    optical coordinate measuring technique
    reverse engineering
    accuracy of workpiece mapping
    Opis:
    Non-invasive method of the measurement and identification of shape and geometrical characteristics of measured detail based on the computer tomograph is widely applied in medicine with high efficiency. The paper is aimed at presenting the metrological analysis of the accuracy of shape reproduction. The examined shape was described due to the tomography and compared to the results of coordinate measurement. The comparative accuracy analysis of the tomography was performed for the typical details, as well as for the masters made with high accuracy. Using the results of the analysis, the respective models of measured details were created and used as a nominal in the further investigations. The results of the measurement with tomography were compared with the results achieved from the measurement by means of typical coordinate measuring machines and by means of 3D measurement optical scanner. Analysis of the gained values of the form deviations and important geometrical characteristics enabled to perform complex analysis of the shape reproduction of the examined detail with the method of computer tomography. The main purpose of the performed researches was the determination of the reproduction accuracy of surface measured with non-invasive computer tomography method. The investigations and analysis have been performed with the following equipment: computer tomograph, 3D printer and coordinate optical scanner supported with specialized software for advanced CAD data analysis.
    Źródło:
    Journal of Automation Mobile Robotics and Intelligent Systems; 2012, 6, 3; 23-26
    1897-8649
    2080-2145
    Pojawia się w:
    Journal of Automation Mobile Robotics and Intelligent Systems
    Dostawca treści:
    Biblioteka Nauki
    Artykuł
      Wyświetlanie 1-12 z 12

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