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    Wyświetlanie 1-6 z 6
    Tytuł:
    TiAl-based Ohmic Contacts to p-type 4H-SiC
    Autorzy:
    Martychowiec, Agnieszka
    Kwietniewski, Norbert
    Kondracka, Kinga
    Werbowy, Aleksander
    Sochacki, Mariusz
    Powiązania:
    https://bibliotekanauki.pl/articles/1844507.pdf
    Data publikacji:
    2021
    Wydawca:
    Polska Akademia Nauk. Czytelnia Czasopism PAN
    Tematy:
    ohmic contact
    SiC
    silicon carbide
    TiAl
    Opis:
    This paper describes successfully formed ohmic contacts to p-type 4H-SiC based on titanium-aluminum alloys. Four different metallization structures were examined, varying in aluminum layer thickness (25, 50, 75, 100 nm) and with constant thickness of the titanium layer (50 nm). Structures were annealed within the temperature range of 800°C - 1100°C and then electrically characterized. The best electrical parameters and linear, ohmic character of contacts demonstrated structures with Al layer thickness equal or greater than that of Ti layer and annealed at temperatures of 1000°C or higher.
    Źródło:
    International Journal of Electronics and Telecommunications; 2021, 67, 3; 459-463
    2300-1933
    Pojawia się w:
    International Journal of Electronics and Telecommunications
    Dostawca treści:
    Biblioteka Nauki
    Artykuł
    Tytuł:
    Influence of spatial distribution and the type of material on the occurrence of bandgaps in phononic crystals
    Autorzy:
    Garus, Sebastian
    Sochacki, Wojciech
    Kwiatoń, Paweł
    Nabiałek, Marcin
    Petrů, Jana
    Kubanek, Mariusz
    Powiązania:
    https://bibliotekanauki.pl/articles/27311439.pdf
    Data publikacji:
    2023
    Wydawca:
    Polska Akademia Nauk. Czasopisma i Monografie PAN
    Tematy:
    finite difference time domain
    band gap
    phononic crystal
    mechanical waves
    propagation
    domena czasowa różnic skończonych
    kryształ fononiczny
    fale mechaniczne
    propagacja
    przerwa energetyczna
    Opis:
    The study investigated the effect of the fill factor, lattice constant, and the shape and type of meta-atom material on the reduction of mechanical wave transmission in quasi-two-dimensional phononic structures. A finite difference algorithm in the time domain was used for the analysis, and the obtained time series were converted into the frequency domain using the discrete Fourier transform. The use of materials with large differences in acoustic impedance allowed to determine the influence of the meta-atom material on the propagation of the mechanical wave.
    Źródło:
    Bulletin of the Polish Academy of Sciences. Technical Sciences; 2023, 71, 3; art. no. e144609
    0239-7528
    Pojawia się w:
    Bulletin of the Polish Academy of Sciences. Technical Sciences
    Dostawca treści:
    Biblioteka Nauki
    Artykuł
    Tytuł:
    Mechanical vibrations: recent trends and engineering applications
    Autorzy:
    Garus, Sebastian
    Błachowski, Bartłomiej
    Sochacki, Wojciech
    Jaskot, Anna
    Kwiatoń, Paweł
    Ostrowski, Mariusz
    Šofer, Michal
    Kapitaniak, Tomasz
    Powiązania:
    https://bibliotekanauki.pl/articles/2090733.pdf
    Data publikacji:
    2022
    Wydawca:
    Polska Akademia Nauk. Czytelnia Czasopism PAN
    Tematy:
    mechanical vibration
    energy harvesting
    modal analysis
    granular materials
    wibracje mechaniczne
    zbieranie energii
    analiza modalna
    materiały ziarniste
    Opis:
    Although the study of oscillatory motion has a long history, going back four centuries, it is still an active subject of scientificr esearch. In this review paper prospective research directions in the field of mechanical vibrations were pointed out. Four groups of important issues in which advanced research is conducted were discussed. The first are energy harvester devices, thanks to which we can obtain or save significant amounts of energy, and thus reduce the amount of greenhouse gases. The next discussed issue helps in the design of structures using vibrations and describes the algorithms that allow to identify and search for optimal parameters for the devices being developed. The next section describes vibration in multi-body systems and modal analysis, which are key to understanding the phenomena in vibrating machines. The last part describes the properties of granulated materials from which modern, intelligent vacuum-packed particles are made. They are used, for example, as intelligent vibration damping devices.
    Źródło:
    Bulletin of the Polish Academy of Sciences. Technical Sciences; 2022, 70, 1; e140351, 1--12
    0239-7528
    Pojawia się w:
    Bulletin of the Polish Academy of Sciences. Technical Sciences
    Dostawca treści:
    Biblioteka Nauki
    Artykuł
    Tytuł:
    Minimizing the number of layers of the quasi one-dimensional phononic structures
    Autorzy:
    Garus, Sebastian
    Sochacki, Wojciech
    Kubanek, Mariusz
    Nabiałek, Marcin
    Powiązania:
    https://bibliotekanauki.pl/articles/2173523.pdf
    Data publikacji:
    2022
    Wydawca:
    Polska Akademia Nauk. Czytelnia Czasopism PAN
    Tematy:
    mechanical waves
    phononic
    transfer matrix
    band gap
    genetic algorithm
    fale mechaniczne
    fononiczny
    macierz przejścia
    pasmo wzbronione
    algorytm genetyczny
    Opis:
    In the work, multi-criteria optimization of phononic structures was performed to minimize the transmission in the frequency range of acoustic waves, eliminate high transmission peaks with a small half-width inside of the band gap, and what was the most important part of the work – to minimize the number of layers in the structure. Two types of the genetic algorithm were compared in the study. The first one was characterized by a constant number of layers (GACL) of the phononic structure of each individual in each population. Then, the algorithm was run for a different number of layers, as a result of which the structures with the best value of the objective function were determined. In the second version of the algorithm, individuals in populations had a variable number of layers (GAVL) which required a different type of target function and crossover procedure. The transmission for quasi-one-dimensional phononic structures was determined with the use of the transfer matrix method algorithm. Based on the research, it can be concluded that the developed GAVL algorithm with an appropriately selected objective function achieved optimal solutions in a much smaller number of iterations than the GACL algorithm, and the value of the k parameter below 1 leads to faster achievement of the optimal structure.
    Źródło:
    Bulletin of the Polish Academy of Sciences. Technical Sciences; 2022, 70, 1; e139394, 1--8
    0239-7528
    Pojawia się w:
    Bulletin of the Polish Academy of Sciences. Technical Sciences
    Dostawca treści:
    Biblioteka Nauki
    Artykuł
    Tytuł:
    Processing of printed circuit boards using a 532 nm green laser
    Autorzy:
    Ciszewski, Piotr
    Sochacki, Mariusz
    Powiązania:
    https://bibliotekanauki.pl/articles/1818232.pdf
    Data publikacji:
    2020
    Wydawca:
    Polska Akademia Nauk. Stowarzyszenie Elektryków Polskich
    Tematy:
    laser cutting
    flexible printed circuits
    heat affected zone
    HAZ
    Opis:
    The paper describes a research on assessing the quality of edges resulting from the interaction of laser pulses with a material of rigid and flexible printed circuits. A modern Nd:YVO4 crystal diode-pumped solid-state laser generating a 532 nm wavelength radiation with a nanosecond pulse time was used for the research. Influence of laser parameters such as beam power and pulse repetition frequency on a heat affected zone and carbonization was investigated. Quality and morphology of laser-cut substrates were analyzed by optical microscopy. High quality laser cutting of printed circuit board substrates was obtained without delamination and surface damage, with a minimal carbonization and heat affected zone. The developed process was implemented on the printed circuit assembly line.
    Źródło:
    Opto-Electronics Review; 2020, 28, 4; 197--202
    1230-3402
    Pojawia się w:
    Opto-Electronics Review
    Dostawca treści:
    Biblioteka Nauki
    Artykuł
    Tytuł:
    Processing of printed circuit boards using a 532 nm green laser
    Autorzy:
    Ciszewski, Piotr
    Sochacki, Mariusz
    Powiązania:
    https://bibliotekanauki.pl/articles/1818234.pdf
    Data publikacji:
    2020
    Wydawca:
    Polska Akademia Nauk. Stowarzyszenie Elektryków Polskich
    Tematy:
    laser cutting
    flexible printed circuits
    heat affected zone
    HAZ
    Opis:
    The paper describes a research on assessing the quality of edges resulting from the interaction of laser pulses with a material of rigid and flexible printed circuits. A modern Nd:YVO4 crystal diode-pumped solid-state laser generating a 532 nm wavelength radiation with a nanosecond pulse time was used for the research. Influence of laser parameters such as beam power and pulse repetition frequency on a heat affected zone and carbonization was investigated. Quality and morphology of laser-cut substrates were analyzed by optical microscopy. High quality laser cutting of printed circuit board substrates was obtained without delamination and surface damage, with a minimal carbonization and heat affected zone. The developed process was implemented on the printed circuit assembly line.
    Źródło:
    Opto-Electronics Review; 2020, 28, 4; 197--202
    1230-3402
    Pojawia się w:
    Opto-Electronics Review
    Dostawca treści:
    Biblioteka Nauki
    Artykuł
      Wyświetlanie 1-6 z 6

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