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Wyszukujesz frazę "Noureddine, Mustapha" wg kryterium: Autor


Wyświetlanie 1-2 z 2
Tytuł:
DWT-PSD extraction feature for defect diagnosis of small wind generator
Autorzy:
Noureddine, Lahcène
Noureddine, Mustapha
Hafaifa, Ahmed
Kouzou, Abdellah
Powiązania:
https://bibliotekanauki.pl/articles/327498.pdf
Data publikacji:
2019
Wydawca:
Polska Akademia Nauk. Polskie Towarzystwo Diagnostyki Technicznej PAN
Tematy:
discrete wavelet transform
BRB defects diagnosis
PSD estimation
renewable energy system
dyskretna transformacja falkowa
diagnostyka
wykrywanie defektów
energia odnawialna
Opis:
In this paper, the ability to detect broken rotor bar (BRB) defects in a small renewable energy system (based on a squirrel cage induction generator (SCIG)) by the digital signal processing of captured phase currents, is presented. The new approach proposed in this study is a combination of two techniques. The first technique is a discrete wavelet transform (DWT) by the decomposition of the phase current signal in multilevel frequency bands. This is performed with the analysis of some selected approximations and/or details, which contain both the lower and upper sideband components presenting the characteristic frequency of the BRB fault. The second technique is power spectral density (PSD) analysis. This approach provides the ability to optimize the diagnosis of rotor defects in electrical generators. The results obtained by the proposed DWT-PSD approach are proved and improved by comparing them with the results of the PSD analysis, obtained from the original phase current signal delivered by the 5.7-kW squirrel cage induction generator, based on a small wind energy conversion system.
Źródło:
Diagnostyka; 2019, 20, 3; 45-52
1641-6414
2449-5220
Pojawia się w:
Diagnostyka
Dostawca treści:
Biblioteka Nauki
Artykuł
Tytuł:
Impact of Water Stress and Temperature on Metabolites and Essential Oil of Rosmarinus officinalis (Phytochemical Screening, Extraction, and Gas Chromatography)
Autorzy:
Laftouhi, Abdelouahid
Eloutassi, Noureddine
Drioua, Soufiane
Ech-Chihbi, Elhachmia
Rais, Zakia
Abdellaoui, Abdelfattah
Taleb, Abdslam
Beniken, Mustapha
Taleb, Mustapha
Powiązania:
https://bibliotekanauki.pl/articles/24201782.pdf
Data publikacji:
2023
Wydawca:
Polskie Towarzystwo Inżynierii Ekologicznej
Tematy:
climate change
primary metabolites
secondary metabolites
essential oil yield
Rosmarinus officinalis
Opis:
Currently, climate change is disrupting life on Earth by causing imbalances in the biosphere. This work aimed to evaluate the impact of climate change on the content of primary and secondary metabolites and the yield of essential oil of Rosmarinus officinalis. Thus, the results of the conducted experiment show that the content of primary metabolites decreased with increasing temperature and decreasing precipitation along the experiment(proteins from 7.61% to 7.14%, carbohydrates from 6.92% to 5.64%, fats from 1.48% to 1.29% and dietary fiber from 4.96% to 4.22% and mineral composition: Ca from 7.67% to 5.98%, Mg from 8.61% to 7.01%, Fe from 7.53% to 7.21% and Mn from 6.85% to 3.97%), and the content of secondary metabolites increased in the second year when increasing the temperature by 5 °C and water stress by 50% (coumarin from 6.59% to 10.99%, saponins from 7.15% to 8.46%, tannin from 3.92% to 5.95%, alkaloids from 6.69% to 15.62% and flavonoid from 8.02% to 15.75%),but in the fourth year when the temperature continued to increase and water stress was 75% the content of secondary metabolites decreased (coumarin from 10.99% to 8.27%, saponins from 8.46% to 7.87%, tannin from 5.95% to 4.85%, alkaloids from 15.62% to 10.68% and flavonoid from 15.75% to 11.36%)and the same results were obtained for the yield of essential oil which increased in the second year and decreased in the fourth year. This GC analysis of the three essential oil samples shows that the majority of compounds in the three essential oils studied are cineole (S1:45.98%, S2:55.36%, S3:43.08%) followed by camphor (S1:17.44%, S2:21.44%, S3:21.56%) and Alpha-pinene (S1:9.30%, S2:8.34%, S3: 9.17%) and other compounds in low percentage.
Źródło:
Journal of Ecological Engineering; 2023, 24, 5; 237--248
2299-8993
Pojawia się w:
Journal of Ecological Engineering
Dostawca treści:
Biblioteka Nauki
Artykuł
    Wyświetlanie 1-2 z 2

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