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    Wyświetlanie 1-8 z 8
    Tytuł:
    Application of inverse Q filtering for improvement of seismic resolution in the Zechstein formation (SW Poland)
    Autorzy:
    Król, M.
    Cichostępski, K.
    Dec, J.
    Pietsch, K.
    Powiązania:
    https://bibliotekanauki.pl/articles/184683.pdf
    Data publikacji:
    2013
    Wydawca:
    Akademia Górniczo-Hutnicza im. Stanisława Staszica w Krakowie. Wydawnictwo AGH
    Tematy:
    seismic resolution
    attenuation
    inverse Q filtering
    Q factor
    Opis:
    Seismic wave attenuation has strong, negative effect on the seismic data resolution. The high influence of this phenomenon was observed during realization of seismic survey "Duża Wólka 3D" (Geofizyka Kraków S.A. 2010a). The resolution of recorded seismic data was very low due to high attenuation caused by the Lower Triassic Buntsandstein sandstones. In consequence, interpretation of the thin-layered Zechstein formation is ambiguous. The aim of this paper is to present the multi-stage algorithm for the purpose of minimizing the attenuation effect, hence increasing the resolution of the seismic data. In order to achieve this, the inverse Q filtering process was used. The Q factor (quality factor) was estimated from the vertical seismic profiling data (Geofizyka Kraków S.A. 2010c). To verify the effectiveness of inverse Q filtering, seismic modelling was performed. Results received from seismic modelling gave basis for application the inverse Q filtering on real data. For this operation the seismic time profile inline 112 was chosen from the seismic data set "Duża Wólka 3D". Application of inverse Q filtering significantly increased the seismic resolution, which enabled the interpretation of the Zechstein formation with more accuracy.
    Źródło:
    Geology, Geophysics and Environment; 2013, 39, 1; 33-44
    2299-8004
    2353-0790
    Pojawia się w:
    Geology, Geophysics and Environment
    Dostawca treści:
    Biblioteka Nauki
    Artykuł
    Tytuł:
    Resonance phenomena in wireless power supply systems
    Autorzy:
    Filipiak, M.
    Powiązania:
    https://bibliotekanauki.pl/articles/97297.pdf
    Data publikacji:
    2016
    Wydawca:
    Politechnika Poznańska. Wydawnictwo Politechniki Poznańskiej
    Tematy:
    wireless power supply
    q–factor
    system performance
    inductance compensation
    Opis:
    The article presents the prospects for application of wireless power supply in electronic devices. A short description of advantages of using this technology including the principle of its operation and construction of typical systems applied in devices of everyday use was provided. Two types of resonance systems used for wireless transmission of energy were presented. Also, advantages and disadvantages of using each of these systems were listed. Furthermore, the impedance and performance analyses of the wireless electric energy transmission systems were discussed. The performance characteristics were presented depending on several parameters in the three–dimensional form. The minimum quality factor of the resonance system, which allows the achievement of the high system performance at low interface between the primary and secondary coil winding was demonstrated. Two tested circuits were compared and the areas of application were determined for each of them. Difficulties related to maintenance of the circuit in resonance and to limitation of losses were determined.
    Źródło:
    Computer Applications in Electrical Engineering; 2016, 14; 127-137
    1508-4248
    Pojawia się w:
    Computer Applications in Electrical Engineering
    Dostawca treści:
    Biblioteka Nauki
    Artykuł
    Tytuł:
    Determination of seismic wave attenuation based on acoustic full waveforms
    Autorzy:
    Święch, E.
    Wandycz, P.
    Powiązania:
    https://bibliotekanauki.pl/articles/89003.pdf
    Data publikacji:
    2015
    Wydawca:
    Politechnika Wrocławska. Wydział Geoinżynierii, Górnictwa i Geologii. Instytut Górnictwa
    Tematy:
    attenuation
    acoustic full waveforms
    quality factor Q
    Opis:
    The loss of elastic energy to the medium can be quantified by the quality factor Q. Acoustic full waveforms log from Winna Góra1 borehole were used to estimate P-wave quality factor. Data used in this paper were analyzed with usage of GeoWin software. Interpretation of acoustic full waveforms was performed for the one pair of waveforms. The most important part in the interpretation of data is manual picking of P wave arrival, calculation of semblance function, and picking anomalies of P wave on amplitude spectrum. Using data from interpretation of acoustic full waveforms, we calculated quality factor. Based on provided analysis it is concluded that the highest attenuation ( so the lowest Q) is observed in Rotliegend strata.
    Źródło:
    Mining Science; 2015, 22; 55-63
    2300-9586
    2353-5423
    Pojawia się w:
    Mining Science
    Dostawca treści:
    Biblioteka Nauki
    Artykuł
    Tytuł:
    Artificial intelligence-based modeling for the estimation of Q-Factor and elastic young’s modulus of sandstones deteriorated by a wetting-drying cyclic process
    Autorzy:
    Rashid, Hafiz Muhammad Awais
    Ghazzali, Muhammad
    Waqas, Umer
    Malik, Adnan Anwar
    Abubakar, Muhammad Zubair
    Powiązania:
    https://bibliotekanauki.pl/articles/2073878.pdf
    Data publikacji:
    2021
    Wydawca:
    Polska Akademia Nauk. Czytelnia Czasopism PAN
    Tematy:
    przepuszczalność skał
    współczynnik Q
    piaskowiec
    wetting and drying cycles
    rock permeability
    dynamic elastic Young’s modulus
    Q-factor
    UCS
    Opis:
    In this study, a series of destructive and non-destructive tests were performed on sandstone samples subjected to wetting-drying cycles. A total of 25 Wet-Dry cycles were provided to investigate any significant change in the engineering properties of sandstones in terms of their porosity, permeability, water absorption, density, Q-factor, elastic modulus (E), and unconfined compressive strength (UCS). The overall reduction in the values of density, E, Q-factor, and UCS was noted as 3-4%, 42-71%, 34-62%, and 26-70% respectively. Whereas, the overall appreciation in the values of porosity, permeability, and water absorption was recorded as 24-50%, 31-64%, and 25-50% respectively. The bivariate analysis showed that the physical parameters had a strong relationship with one another and their Pearson’s correlation value (R) ranged from 0.87-0.99. In prediction modeling, Q-factor and E were regressed with the contemplated physical properties. The linear regression models did not provide satisfactory results due to their multicollinearity problem. Their VIF (variance inflation factor) value was found much greater than the threshold limit of 10. To overcome this problem, the cascade-forward neural network technique was used to develop significant prediction models. In the case of a neural network modeling, the goodness of fit between estimated and predicted values of the Q-factor (R2 = 0.86) and E (R2 = 0.91) was found much better than those calculated for the Q-factor (R2 = 0.30) and E (R2 = 0.36) in the regression analysis.
    Źródło:
    Archives of Mining Sciences; 2021, 66, 4; 635--658
    0860-7001
    Pojawia się w:
    Archives of Mining Sciences
    Dostawca treści:
    Biblioteka Nauki
    Artykuł
    Tytuł:
    Execution Simulation Design of Fiber-to-the- home (FTTH) Device Ingress Networks Using GPON with FBG Based on OptiSystem
    Autorzy:
    Shabaneh, Arafat Abdallah
    Melhem, Masa Loai
    Powiązania:
    https://bibliotekanauki.pl/articles/2200708.pdf
    Data publikacji:
    2022
    Wydawca:
    Polska Akademia Nauk. Czytelnia Czasopism PAN
    Tematy:
    fiber to the home
    fiber Bragg grating
    power link budget
    Q-factor
    gigabit passive optical networks
    Opis:
    Consumers require high-speed data transmission for different activities, such as smartphone usage, live broadcasting of news, and video conferencing. Therefore, a reliable communication network is needed to provide this kind of service to users. Fiber to the home (FTTH) is an optical fiber architecture that uses fiber cables in the access network for direct and final connection to homes or offices of customers. Networks based on FTTH can offer high performance, speed, and quality. An optical fiber communication system based on FTTH device ingress network using gigabit passive optical networks (GPONs) with fiber Bragg grating (FBG) and optical amplifier is designed and analyzed in this study. The developed design based on the FTTH device and FBG shows a low bit error rate (BER) for downstream and upstream configurations with an optical fiber length of 20 km. Downstream and upstream configurations achieve a Q-factor of 89.5 and 181.3, respectively. Achievable sensitivity of the developed system is −28 dBm, while the received signal based on OptiSystem is −25.59 dBm. FTTH with FBG will play a major role in the future and provide effective solutions for a wide variety of applications in network communication systems and data transmission rates.
    Źródło:
    International Journal of Electronics and Telecommunications; 2022, 68, 4; 783--791
    2300-1933
    Pojawia się w:
    International Journal of Electronics and Telecommunications
    Dostawca treści:
    Biblioteka Nauki
    Artykuł
    Tytuł:
    Development of wide-band geometry dependent RF planar spiral inductor SPICE model
    Autorzy:
    Gadjeva, E. D.
    Hristov, M. H.
    Durev, V. P.
    Powiązania:
    https://bibliotekanauki.pl/articles/398080.pdf
    Data publikacji:
    2011
    Wydawca:
    Politechnika Łódzka. Wydział Mikroelektroniki i Informatyki
    Tematy:
    model komputerowy
    spiralne płaskie induktory
    symulacja PSpice
    modele skalowalne
    współczynnik dobroci
    computer models
    planar spiral inductors
    PSpice simulation
    scalable models
    Q factor
    Opis:
    Parameterized wide-band geometry dependent SPICE models for oil-chip planar spiral inductors are developed in the paper. Model descriptions are presented in the form of PSpice model and in schematic view. The models are realized in the Cadence Capture and Cadence PSpice environment. The developed computer models can be used For adequate computer modeling and simulation of RF circuits. The geometry dependence of the model parameters allows geometry optimization and design automation of spiral inductors. The simulation results are compared to the measurement data for the model verification demonstrating the validity of the computer models.
    Źródło:
    International Journal of Microelectronics and Computer Science; 2011, 2, 2; 39-43
    2080-8755
    2353-9607
    Pojawia się w:
    International Journal of Microelectronics and Computer Science
    Dostawca treści:
    Biblioteka Nauki
    Artykuł
    Tytuł:
    A subordination results for a class of analytic functions defined by q-differential operator
    Autorzy:
    Frasin, Basem Aref
    Murugusundaramoorthy, Gangadharan
    Powiązania:
    https://bibliotekanauki.pl/articles/1792818.pdf
    Data publikacji:
    2020-01-14
    Wydawca:
    Uniwersytet Pedagogiczny im. Komisji Edukacji Narodowej w Krakowie
    Tematy:
    Analytic functions
    Univalent functions
    Subordinating factor sequence
    q-difference operator
    Hadamard product (or convolution)
    Opis:
    In this paper, we derive several subordination results and integral means result for certain class of analytic functions defined by means of q-differential operator. Some interesting corollaries and consequences of our results are also considered.
    Źródło:
    Annales Universitatis Paedagogicae Cracoviensis. Studia Mathematica; 2020, 19; 53-64
    2300-133X
    Pojawia się w:
    Annales Universitatis Paedagogicae Cracoviensis. Studia Mathematica
    Dostawca treści:
    Biblioteka Nauki
    Artykuł
    Tytuł:
    Dynamiczna kompensacja mocy biernej z użyciem 1-fazowego energetycznego filtru aktywnego
    Dynamic Reactive Power Compensation with the Use of 1-Phase Active Power Filter
    Autorzy:
    Adrikowski, T.
    Buła, D.
    Pasko, M.
    Powiązania:
    https://bibliotekanauki.pl/articles/159377.pdf
    Data publikacji:
    2016
    Wydawca:
    Sieć Badawcza Łukasiewicz - Instytut Elektrotechniki
    Tematy:
    1-fazowy energetyczny filtr aktywny
    teoria mocy p-q
    dynamiczna kompensacja mocy biernej
    korekcja współczynnika mocy
    one-phase active power filter
    extension p-q theorem
    dynamic reactive power compensation
    power factor correction
    Opis:
    Pewna grupa odbiorników energii elektrycznej pobiera szybko zmienną w czasie moc bierną. Do takiej grupy należą obwody biurowe złożone z komputerów. Taki obwód pobiera moc bierną o dużej dynamice zmian na poziomie minut czy sekund i ułamka sekund, co uniemożliwia skuteczne skompensowanie mocy biernej z użyciem standardowych kompensatorów bazujących na baterii kondensatorów. Potrzebują one bowiem od kilku do kilkudziesięciu sekund na przełączenie pomiędzy kolejnymi sekcjami baterii kondensatorów co wynika bezpośrednio z czasu potrzebnego na ich rozładowanie. Przedmiotem rozważań będzie zastosowanie 1-fazowego filtru aktywnego do kompensacji dynamicznych zmian mocy biernej. Do sterowania 1-fazowym filtrem aktywnym zostanie wykorzystany algorytm p-q. Rozważania zostaną poparte symulacjami przeprowadzonymi w środowisku MATLAB-Simulink.
    A certain group of electrical power loads consumes fast time-varying reactive power. To this group belong office circuits containing computers. This circuit gets the reactive power with high dynamic changes at the level of minutes or seconds and fractions of seconds, making it impossible to efficiently compensate by compensators with standard battery based on capacitors. They need several to tens of seconds to switch between each sector of capacitor banks which directly results from the time required for their discharge. The subject of considerations will be the application of a one-phase active filter to compensate the dynamic changes of the reactive power. A modified pq algorithm will be used to control of the one-phase active filter. Considerations will be supported by simulations carried out in the MATLAB-Simulink environment.
    Źródło:
    Prace Instytutu Elektrotechniki; 2016, 272; 119-130
    0032-6216
    Pojawia się w:
    Prace Instytutu Elektrotechniki
    Dostawca treści:
    Biblioteka Nauki
    Artykuł
      Wyświetlanie 1-8 z 8

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