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Wyświetlanie 1-10 z 65
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:
Channel drop filter based on photonic crystal ring resonator
Autorzy:
Alipour-Banaei, H.
Jahanara, M.
Mehdizadeh, F.
Powiązania:
https://bibliotekanauki.pl/articles/174022.pdf
Data publikacji:
2018
Wydawca:
Politechnika Wrocławska. Oficyna Wydawnicza Politechniki Wrocławskiej
Tematy:
photonic crystal
optical filter
ring resonator
quality factor
Opis:
Photonic crystal ring resonators are promising candidates for realizing all optical filters with acceptable transmission efficiency and quality factor values. In this paper, by putting a hexagon-shaped structure at the middle of on 7 × 7 square cavity we created a ring resonator structure and designed a channel drop filter. The drop wavelength of our filter is at 1550.4 nm, with transmission efficiency and quality factor equal to 94% and 707, respectively. Our structure is composed of dielectric rods immersed in air. Because in this kind of structures the dominant band gap is in TM mode, all of our simulations have been done in TM mode. The total footprint of our filter is 199.4 μm2, which makes it suitable for all optical integrated circuits.
Źródło:
Optica Applicata; 2018, 48, 4; 601-608
0078-5466
1899-7015
Pojawia się w:
Optica Applicata
Dostawca treści:
Biblioteka Nauki
Artykuł
Tytuł:
Implementation of C-PolSK Modulation in FSO Network and Analysis of its Atmospheric Performance
Autorzy:
Chattopadhyay, Diptangshu
Bharti, Manisha
Powiązania:
https://bibliotekanauki.pl/articles/309433.pdf
Data publikacji:
2019
Wydawca:
Instytut Łączności - Państwowy Instytut Badawczy
Tematy:
attenuation
bit error rate
circular polarization shift keying
quality factor
Opis:
Free Space Optical (FSO) communication is a quickly developing technology that is designed to handle high data rates while maintaining a good quality factor (Q-factor). Many novel techniques have been implemented to cope with atmospheric attenuating factors, such as fog and rain. Here, we have introduced circular polarization shift keying (C-PolSK) modulation to produce a stable and uniform light beam. The plane of polarized light keeps rotating along with the propagation vector, which helps reduce phase variations and cross-channel effects. C-PolSK provides higher penetrating power and attenuation resistance over linear polarization shift keying (L-PolSK). Two different C-PolSK models have been proposed and graphical comparisons, relying on such parameters as Q-factor, transmission distance and inputoutput power, have been made. The cases of moderate fog and rain attenuation are taken to verify the model’s efficiency. Polarized light is split into two orthogonal components and then modulated using the Mach-Zehnder modulator. One of the models also employs the principle of orthogonal differential phase shifting. Eye diagrams have been provided to verify the bit error rate (BER). The orthogonal differential phase shifted C-PolSK model proves to be the most suitable implementation prototype.
Źródło:
Journal of Telecommunications and Information Technology; 2019, 4; 43-49
1509-4553
1899-8852
Pojawia się w:
Journal of Telecommunications and Information Technology
Dostawca treści:
Biblioteka Nauki
Artykuł
Tytuł:
Four channel optical demultiplexer based on L2 photonic crystal microcavity
Autorzy:
Ammari, Merzoug
Benmerkhi, Ahlem
Bouchemat, Mohamed
Powiązania:
https://bibliotekanauki.pl/articles/2172853.pdf
Data publikacji:
2022
Wydawca:
Politechnika Wrocławska. Oficyna Wydawnicza Politechniki Wrocławskiej
Tematy:
photonic crystal
cavity
waveguide
quality factor
demultiplexer
FDTD
filter
crosstalk
Opis:
The wavelength demultiplexing is a particularly important function in integrated optics and can be realized using photonic crystals. The aim is to extract accurately the wavelengths in a data flux. In this work, we investigate a new topologies of wavelength demultiplexing based on two-dimensional photonic crystals constituted of dielectric rods spread in a square network. The studied demultiplexer is based on optical filters with optimized parameters in order to extract four different wavelengths in the vicinity of frequencies corresponding to communication windows. It was found that the crosstalk between the structure channels of the demultiplexer are in the range of –19.19 and – 44.1 dB and the channel spacing is equal to 0.96 nm. The simulation results presented in this paper are performed and analyzed using the FDTD method.
Źródło:
Optica Applicata; 2022, 52, 4; 613--625
0078-5466
1899-7015
Pojawia się w:
Optica Applicata
Dostawca treści:
Biblioteka Nauki
Artykuł
Tytuł:
Micromechanically Tunable Dielectric Rod Resonator
Autorzy:
Savin, Kostiantyn
Golubeva, Irina
Kazmirenko, Victor
Prokopenko, Yuriy
Vandenbosch, Guy A. E.
Powiązania:
https://bibliotekanauki.pl/articles/2055216.pdf
Data publikacji:
2021
Wydawca:
Polska Akademia Nauk. Czytelnia Czasopism PAN
Tematy:
dielectric resonator
resonant frequency
electromechanical tuning
quality factor
mode matching technique
Opis:
A resonant frequency control method for dielectric rod resonators is discussed. A dielectric rod of cylindrical shape is placed inside a metal cavity. The bottom face of the dielectric rod is fixed at the metal base plate. Resonant frequency tuning is achieved by lifting the top metal plate above the dielectric rod upper face. The paper presents simulations using the mode matching technique and experimental study of this tunable resonator. Resonant frequency of the basic mode can be tuned by more than an octave with displacements of only tens of micrometres, which is in range of piezoactuators, MEMS, etc. A distinct feature of the proposed tuning technique is that the quality factor of the system does not degrade throughout the tuning range.
Źródło:
International Journal of Electronics and Telecommunications; 2021, 67, 4; 615--621
2300-1933
Pojawia się w:
International Journal of Electronics and Telecommunications
Dostawca treści:
Biblioteka Nauki
Artykuł
Tytuł:
Computer image analysis for the estimation of kernel quality in faba bean [Vicia faba L.minor]
Autorzy:
Kubiak, A.
Usajewicz, I.
Powiązania:
https://bibliotekanauki.pl/articles/1371708.pdf
Data publikacji:
1993
Wydawca:
Instytut Rozrodu Zwierząt i Badań Żywności Polskiej Akademii Nauk w Olsztynie
Tematy:
Vicia faba
kernel surface
computer image analysis
quality factor
faba bean
kernel quality
estimation
Źródło:
Polish Journal of Food and Nutrition Sciences; 1993, 02, 2; 51-57
1230-0322
2083-6007
Pojawia się w:
Polish Journal of Food and Nutrition Sciences
Dostawca treści:
Biblioteka Nauki
Artykuł
Tytuł:
Active Inductor with Feedback Resistor Based Voltage Controlled Oscillator Design for Wireless Applications
Autorzy:
Faruqe, Omar
Amin, Md. Tawfiq
Powiązania:
https://bibliotekanauki.pl/articles/226124.pdf
Data publikacji:
2019
Wydawca:
Polska Akademia Nauk. Czytelnia Czasopism PAN
Tematy:
VCO
active inductor
inductance
quality factor
phase noise
figure-of-merit
Opis:
This paper presents active inductor based VCO design for wireless applications based on analysis of active inductor models (Weng-Kuo Cascode active inductor & Liang Regular Cascode active inductor) with feedback resistor technique. Embedment of feedback resistor results in the increment of inductance as well as the quality factor whereas the values are 125.6@2.4GHz (Liang) and 98.7@3.4GHz (Weng- Kuo). The Weng-Kuo active inductor based VCO shows a tuning frequency of 1.765GHz ~2.430GHz (31.7%), while consuming a power of 2.60 mW and phase noise of -84.15 dBc/Hz@1MHz offset. On the other hand, Liang active inductor based VCO shows a frequency range of 1.897GHz ~2.522GHz (28.28%), while consuming a power of 1.40 mW and phase noise of -80.79 dBc/Hz@1MHz offset. Comparing Figure-of-Merit (FoM), power consumption, output power and stability in performance, designed active inductor based VCOs outperform with the state-of-the-art.
Źródło:
International Journal of Electronics and Telecommunications; 2019, 65, 1; 57-64
2300-1933
Pojawia się w:
International Journal of Electronics and Telecommunications
Dostawca treści:
Biblioteka Nauki
Artykuł
Tytuł:
Measuring device moisture content of transformer oil
Izmeritelnoe ustrojjstrvo vlagosoderzhanija transformatornogo masla
Autorzy:
Polovinka, D.
Nevzlyn, B.
Syrtsov, A.
Powiązania:
https://bibliotekanauki.pl/articles/792806.pdf
Data publikacji:
2013
Wydawca:
Komisja Motoryzacji i Energetyki Rolnictwa
Tematy:
moisture content
transformer oil
measuring device
Lambert function
measuring transducer
quality factor
Źródło:
Teka Komisji Motoryzacji i Energetyki Rolnictwa; 2013, 13, 4
1641-7739
Pojawia się w:
Teka Komisji Motoryzacji i Energetyki Rolnictwa
Dostawca treści:
Biblioteka Nauki
Artykuł
Tytuł:
Improved low channel spacing high quality factor four-channel demultiplexer based on photonic crystal ring resonators
Autorzy:
Talebzadeh, R.
Soroosh, M.
Mehdizadeh, F.
Powiązania:
https://bibliotekanauki.pl/articles/175084.pdf
Data publikacji:
2016
Wydawca:
Politechnika Wrocławska. Oficyna Wydawnicza Politechniki Wrocławskiej
Tematy:
photonic crystal
photonic band gap
shell-type ring resonator
quality factor
crosstalk
Opis:
In this paper, we propose a compact structure to realize the demultiplexing operation for dense wavelength division multiplexing communication systems using improved shell-type ring resonators in a photonic crystal structure. The cross-section of the structure is 790 μm2 and is desirable for integration based on popular planar technology. To improve power transmission coupling efficiency, we introduce the phase matching condition between ring resonators and waveguides; the results exhibit near 100% transmission efficiency. To obtain a high quality factor, we use interior lower refractive indices spheres inside the ring resonators as the mirrors; a quality factor as high as 15497 is achieved. The average pass bands of channels are near 0.1 nm, and the channel spacing is approximately 0.6 nm. The wavelengths of the demultiplexer are 1549, 1549.7, 1550.3 and 1550.9 nm. The crosstalk is between –14 and –29 dB, and the mean value of the crosstalk is –18.39 dB.
Źródło:
Optica Applicata; 2016, 46, 4; 553-564
0078-5466
1899-7015
Pojawia się w:
Optica Applicata
Dostawca treści:
Biblioteka Nauki
Artykuł
Tytuł:
Correlation between selected factors and quality of seminatural Western Carpathian grasslands
Autorzy:
Nowák, J.
Powiązania:
https://bibliotekanauki.pl/articles/11049575.pdf
Data publikacji:
2006
Wydawca:
Uniwersytet Przyrodniczy w Lublinie. Wydawnictwo Uniwersytetu Przyrodniczego w Lublinie
Tematy:
correlation
quality factor
quality
semi-natural grassland
grassland
grass
legume
herb
moss
species diversity
Carpathians Mountains
Źródło:
Annales Universitatis Mariae Curie-Skłodowska. Sectio E. Agricultura; 2006, 61; 293-301
0365-1118
Pojawia się w:
Annales Universitatis Mariae Curie-Skłodowska. Sectio E. Agricultura
Dostawca treści:
Biblioteka Nauki
Artykuł
Wyświetlanie 1-10 z 65

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