Temat: CN parameter - Katalog OPAC zbiorów

Skocz do pozycji: 1.

Tytuł:: Wizualizacja turbulentnego przepływu powietrza w strefie modelu za pomocą parametru Cn
Visualisation of turbulent air flow in vivinity of the model by means of Cn parameter
Autorzy:: Klemm, K.
Pieszyński, K.
Rożniakowski, K.
Powiązania:: https://bibliotekanauki.pl/articles/362764.pdf
Data publikacji:: 2010
Wydawca:: Instytut Fizyki Budowli Katarzyna i Piotr Klemm
Tematy:: parametr Cn
laser
model
parameter Cn
Opis:: W pracy oszacowano parametr struktury współczynnika załamania Cn w strefie napływu powietrza na model bydunku. Badania przeprowadzono w tunelu aerodynamicznym, którego poprzeczne rozmiary są dużo większe od rozmiarów modelu. Do badań zastosowano wąską wiązkę światła laserowego. Parametr Cn wyznaczono na podstawie równania zaproponowanego w pracy [1].
The paper presents assessment of the structure parameter of refractive index Cn in the air inflow zone in front of a building model. Experiment has been carried out in wind tunnel with a crosswise dimension considerably larger then dimension of the model. The structure parameter of refractive index Cn has been determined on a base of equation proposed by Chiba and with the use of a narrow laser beam.
Źródło:: Fizyka Budowli w Teorii i Praktyce; 2010, T. 5, nr 2, 2; 27-34
1734-4891
Pojawia się w:: Fizyka Budowli w Teorii i Praktyce
Dostawca treści:: Biblioteka Nauki

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Skocz do pozycji: 2.

Tytuł:: Flow Rate Determination as a Function of Rainfall for the Ungauged Suhareka River
Autorzy:: Kusari, Laura
Osmanaj, Lavdim
Shehu, Hana
Bungu, Samir
Powiązania:: https://bibliotekanauki.pl/articles/2086389.pdf
Data publikacji:: 2022
Wydawca:: Polskie Towarzystwo Inżynierii Ekologicznej
Tematy:: catchment area
regression coefficient
CN parameter
rainfall intensity
flow curve
rainfall
flood
Opis:: For ungauged rivers, when there are no hydrological measurements and there is a lack of data on perennial flow rates, the latter one to be determined based on other hydrological data. The river Suhareka catchment represents a similar case. Since there is no data on Suhareka’s flow rates, the authors of this study aimed for the flow rate determination based on rainfall measurements. From the available data on annual precipitation (monthly sums) provided by the Kosovo Hydrometeorological Institute for the Suhareka hydrometric station, the observed monthly rainfall data for 30 years were analysed. Those gaps were initially filled by connecting the hydrometric station in Suhareka with those of Prishtina, Prizren and Ferizaj, and as a result a fairly good fit was ensured. Moreover, the intensity-duration-frequency curves were formed using the expression of Sokolovsky, as a mathematical model of the dependence I (T, P). For a transformation of rainfall into flow, the American method SCS was used. As a result, the equation for the Suhareka River basin was derived, which enabled the determination of maximum inflows, for different return periods. The results obtained through this paper, indicates that even for ungauged river basins the peak flows can be determined from available rainfall data.
Źródło:: Journal of Ecological Engineering; 2022, 23, 4; 110--121
2299-8993
Pojawia się w:: Journal of Ecological Engineering
Dostawca treści:: Biblioteka Nauki

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Skocz do pozycji: 3.

Tytuł:: An approach to investigating the feasibility of free-space optical communication technology deployment under scintillation effects
Autorzy:: Mahmood, Aras S.
Powiązania:: https://bibliotekanauki.pl/articles/27315698.pdf
Data publikacji:: 2023
Wydawca:: Polska Akademia Nauk. Stowarzyszenie Elektryków Polskich
Tematy:: free-space optical communication
atmospheric turbulence
scintillation attenuation
refractive index structure parameter (Cn²)
Opis:: Local weather conditions have an impact on the availability of free-space optical (FSO) communication. The variation in meteorological parameters, such as temperature, humidity, and wind speed, leads to variations of the refractive index along the transmission path. These refractive index inhomogeneities produced by atmospheric turbulence induce optical turbulence which is responsible for random fluctuations in the intensity of the laser beam that carries the signal (irradiance) called scintillations that can significantly degrade the performance of FSO systems. This paper aims to investigate the feasibility of deploying FSO communication technology under scintillation effects in any urban region and atmospheric environment. To achieve that, firstly by utilizing the Hufnagel-Vally day with the Sadot and Kopeika models together, the scintillation strength for a specified region, Sulaimani City in north-eastern Iraq as an example, has been estimated through the calculation of the refractive index structure parameter (Cn²) over a period of 10 years and it was found to be at the strong turbulence level. Secondly, from the same estimated parameter, the scintillation attenuation of the signal carrying the laser beam intensity can be calculated to investigate the feasibility of FSO communication using Optysistem-7 software. The optimal link distance for northeastern Iraq (Sulaimani City) has been found to be within the limit of about 5.5 km. Analysing the max. Q-factor, bit-error rate and signal to noise ratio for an average of 120 months between 2013-2022 assessed the best and worst seasons for FSO.
Źródło:: Opto-Electronics Review; 2023, 31, 3; art. no. e147037
1230-3402
Pojawia się w:: Opto-Electronics Review
Dostawca treści:: Biblioteka Nauki

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