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Wyszukujesz frazę "Almadani, Mohammad" wg kryterium: Autor


Wyświetlanie 1-2 z 2
Tytuł:
Stacking Artificial Intelligence Models for Predicting Water Quality Parameters in Rivers
Autorzy:
Almadani, Mohammad
Kheimi, Marwan
Powiązania:
https://bibliotekanauki.pl/articles/2202356.pdf
Data publikacji:
2023
Wydawca:
Polskie Towarzystwo Inżynierii Ekologicznej
Tematy:
dissolved oxygen
water quality
ensemble-stacking model
meta-learner
Opis:
Scrutinizing the changes in the quality of river water is one of the main factors of monitoring the quality of natural flows, which plays a crucial role in the sustainable management of these ecosystems. The concentration of dissolved oxygen (DO) in river water is one of the most important indicators of quality management in such water bodies. From an environmental point of view, exceeding the permissible and natural decay capacity of pollutants in natural streams leads to a decrease in DO and, consequently, causes serious risks for the survival of aquatic life in related ecosystems. Hence, in the present study, 10 daily variables with the amount of dissolved oxygen on the same day were collected and evaluated from Allen County. Moreover, half of these variables were chosen as effective inputs to the model based on statistical analysis, so as to calculate the dissolved oxygen concentration parameter. Modeling with artificial intelligence approaches was implemented in the form of four individual methods: ANFIS-PSO, OS-ELM, Bagging-RF and Boosting CART, and two ensemble-stacking methods: SMA and Meta-learner MLP. The outcomes of estimating the DO with RMSE, MAE, GRI, r, and MBE criteria and marginal-scatter and subject profile diagrams were discussed. Moreover, the efficiency of the models in estimating the outlier of the observational data was scrutinized by subject profile diagram. Finally, it was found that the Meta-learner MLP model with RMSE of 0.965 mg/L had improvement in performance by 8.8%, 8.9%, 22.3%, 24.9% and 27.6%, respectively, compared to SMA, Boosting CART, Bagging-RF, ANFIS-PSO and OS-ELM methods. This remarkable improvement led to recommendations for using stacking techniques in water quality modeling and simulation.
Źródło:
Journal of Ecological Engineering; 2023, 24, 2; 152--164
2299-8993
Pojawia się w:
Journal of Ecological Engineering
Dostawca treści:
Biblioteka Nauki
Artykuł
Tytuł:
Crumb rubber geopolymer mortar at elevated temperature exposure
Autorzy:
Azmi, Ahmad Azrem
Abdullah, Mohd Mustafa Al Bakri
Ghazali, Che Mohd Ruzaidi
Ahmad, Romisuhani
Jaya, Ramadhansyah Putra
Rahim, Shayfull Zamree Abd
Almadani, Mohammad A.
Wysłocki, Jerzy J.
Śliwa, Agata
Sandu, Andrei Victor
Powiązania:
https://bibliotekanauki.pl/articles/2173997.pdf
Data publikacji:
2022
Wydawca:
Polska Akademia Nauk. Czytelnia Czasopism PAN
Tematy:
popiół lotny
zaprawa geopolimerowa
okruchy gumy
temperatura podwyższona
narażenie
fly ash
geopolymer mortar
crumb rubber
elevated temperature
exposure
Opis:
Low calcium fly ash is used as the main material in the mixture and the crumb rubber was used in replacing fine aggregates in geopolymer mortar. Sodium hydroxide (NaOH) and sodium silicate (Na2SiO3) which were high alkaline solution were incorporated as the alkaline solution. The fly ash reacted with the alkaline solution forming alumino-silicate gel that binds the aggregate to produce a geopolymer mortar. The loading of crumb rubber in the fly ash based geopolymer mortar was set at 0% (CRGM-0), 5% (CRGM-5), 10% (CRGM-10), 15% (CRGM-15), and 20% (CRGM-20), respectively. NaOH solution (12M) and Na2SiO3 solution ratio is set constant at 2.5 for all geopolymer mixture and the fly ash to alkali activator ratio was kept at 2.0. The CRGM at 28 days of curing time was exposed to elevated temperature at 200ºC, 400ºC, 600ºC and 800ºC. The weight loss of the CRGM increases with increasing temperature at all elevated temperatures. However, the density and compressive strength of CRGM decrease with an increase of crumb rubber loading for all elevated temperature exposure. The compressive strength of CRGM reduced due to the fact that rubber decomposes between 200ºC and 600ºC thereby creating voids. CRGM-15 and CRGM-20 showed cracks developed with rough surface at 800ºC. Image obtained from scanning electron microscope (SEM) showed that, the CRGM changed significantly due to the decomposition of crumb rubber and evaporation of the free water at 400ºC, 600ºC and 800ºC.
Źródło:
Archives of Civil Engineering; 2022, 68, 3; 87--105
1230-2945
Pojawia się w:
Archives of Civil Engineering
Dostawca treści:
Biblioteka Nauki
Artykuł
    Wyświetlanie 1-2 z 2

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