Temat: q–factor - Prolib Integro

Skocz do pozycji: 1.

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.
Tematy:: seismic resolution
attenuation
inverse Q filtering
Q factor; Pokaż więcej
Wydawca:: Akademia Górniczo-Hutnicza im. Stanisława Staszica w Krakowie. Wydawnictwo AGH
Powiązania:: https://bibliotekanauki.pl/articles/184683.pdf Link otwiera się w nowym oknie
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.
Dostawca treści:: Biblioteka Nauki

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Skocz do pozycji: 2.

Tytuł:: Resonance phenomena in wireless power supply systems
Autorzy:: Filipiak, M.
Tematy:: wireless power supply
q–factor
system performance
inductance compensation; Pokaż więcej
Wydawca:: Politechnika Poznańska. Wydawnictwo Politechniki Poznańskiej
Powiązania:: https://bibliotekanauki.pl/articles/97297.pdf Link otwiera się w nowym oknie
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.
Dostawca treści:: Biblioteka Nauki

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Skocz do pozycji: 3.

Tytuł:: Non-line of sight analysis for vehicular visible light communication system : impact of artificial light source and weather conditions
Autorzy:: Tawfik, Nagwan I.
El-Mokadem, Eslam Samy
Aly, Moustafa H.
El-Deeb, Walid S.
Tematy:: artificial light source
laser diode
optical amplifier
non-line of sight
Q-factor
vehicular communication; Pokaż więcej
Wydawca:: Polska Akademia Nauk. Stowarzyszenie Elektryków Polskich
Powiązania:: https://bibliotekanauki.pl/articles/59112952.pdf Link otwiera się w nowym oknie
Opis:: Visible light communication is seen as a crucial technology within optical wireless communication systems. The technology of vehicular visible light communication holds significant importance in the context of connected vehicles. This technology can serve as a supplementary solution to vehicular systems that are based on radio frequency. In this paper, the authors conduct an analysis of the performance of both line-of-sight and non-line-of-sight vehicle-to-vehicle visible light communication systems under the effect of artificial light source and weather conditions, including clear, hazy, and foggy weather. A practical vehicular laser diode, a street lamp, and an avalanche photodiode are used to design the proposed system model. Performance enhancement for the proposed system is achieved using an optical amplifier at the receiving end. An artificial light source of light-emitting diode Corn-type is used to represent an ambient artificial light source. Different metrics such as quality factor and bit error rate are used to assess the system performance of the non-line-of-sight-vehicular communication system. The proposed line-of-sight model achieves a data rate of 25 Gbps, supporting a distance of 80 m under clear sky and hazy atmospheric conditions. For foggy weather, an attainable link distance of 70 m is achieved. The achieved results emphasize the suitability of the suggested models for vehicular applications in real world environment.
Dostawca treści:: Biblioteka Nauki

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Skocz do pozycji: 4.

Tytuł:: Determination of seismic wave attenuation based on acoustic full waveforms
Autorzy:: Święch, E.
Wandycz, P.
Tematy:: attenuation
acoustic full waveforms
quality factor Q; Pokaż więcej
Wydawca:: Politechnika Wrocławska. Wydział Geoinżynierii, Górnictwa i Geologii. Instytut Górnictwa
Powiązania:: https://bibliotekanauki.pl/articles/89003.pdf Link otwiera się w nowym oknie
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.
Dostawca treści:: Biblioteka Nauki

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Skocz do pozycji: 5.

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
Tematy:: fiber to the home
fiber Bragg grating
power link budget
Q-factor
gigabit passive optical networks; Pokaż więcej
Wydawca:: Polska Akademia Nauk. Czytelnia Czasopism PAN
Powiązania:: https://bibliotekanauki.pl/articles/2200708.pdf Link otwiera się w nowym oknie
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.
Dostawca treści:: Biblioteka Nauki

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Skocz do pozycji: 6.

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
Tematy:: przepuszczalność skał
współczynnik Q
piaskowiec
wetting and drying cycles
rock permeability
dynamic elastic Young’s modulus
Q-factor
UCS; Pokaż więcej
Wydawca:: Polska Akademia Nauk. Czytelnia Czasopism PAN
Powiązania:: https://bibliotekanauki.pl/articles/2073878.pdf Link otwiera się w nowym oknie
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.
Dostawca treści:: Biblioteka Nauki

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Skocz do pozycji: 7.

Tytuł:: Development of wide-band geometry dependent RF planar spiral inductor SPICE model
Autorzy:: Gadjeva, E. D.
Hristov, M. H.
Durev, V. P.
Tematy:: model komputerowy
spiralne płaskie induktory
symulacja PSpice
modele skalowalne
współczynnik dobroci
computer models
planar spiral inductors
PSpice simulation
scalable models
Q factor; Pokaż więcej
Wydawca:: Politechnika Łódzka. Wydział Mikroelektroniki i Informatyki
Powiązania:: https://bibliotekanauki.pl/articles/398080.pdf Link otwiera się w nowym oknie
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.
Dostawca treści:: Biblioteka Nauki

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Skocz do pozycji: 8.

Tytuł:: A subordination results for a class of analytic functions defined by q-differential operator
Autorzy:: Frasin, Basem Aref
Murugusundaramoorthy, Gangadharan
Tematy:: Analytic functions
Univalent functions
Subordinating factor sequence
q-difference operator
Hadamard product (or convolution); Pokaż więcej
Wydawca:: Uniwersytet Pedagogiczny im. Komisji Edukacji Narodowej w Krakowie
Powiązania:: https://bibliotekanauki.pl/articles/1792818.pdf Link otwiera się w nowym oknie
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.
Dostawca treści:: Biblioteka Nauki

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Skocz do pozycji: 9.

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.
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; Pokaż więcej
Wydawca:: Sieć Badawcza Łukasiewicz - Instytut Elektrotechniki
Powiązania:: https://bibliotekanauki.pl/articles/159377.pdf Link otwiera się w nowym oknie
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.
Dostawca treści:: Biblioteka Nauki

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