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Wyszukujesz frazę "Salem, Ahmed" wg kryterium: Autor


Wyświetlanie 1-4 z 4
Tytuł:
Vehicle-deck fires aboard RoPax ships: a comparison between numerical modelling and experimental results
Autorzy:
Salem, Ahmed
Powiązania:
https://bibliotekanauki.pl/articles/259491.pdf
Data publikacji:
2019
Wydawca:
Politechnika Gdańska. Wydział Inżynierii Mechanicznej i Okrętownictwa
Tematy:
vehicle-deck fires
RoPax ships
zone models
field models
model-scale fire tests
Opis:
According to an official study conducted by the IMO Correspondence Group on Casualty Analysis concerning the fire incidents that occurred on the vehicle-decks of RoPax ships, covering the period from 1994 to 2011, it has been shown that a very serious incident has occurred every other year since 2002, resulting in six constructive total losses. The results of this review shed the light on the need to investigate the application of fire models to simulate fire scenarios that may occur on the vehicle-decks aboard RoPax ships. This will be very useful for the RoPax designers who are willing to introduce new technologies or deviate from the current prescriptive regulations of fire safety design in order to reduce the risk of such catastrophic accidents. The aim of this paper is to present the results of a comparison between the predictions of three different fire models and the experimental results of a model-scale fire test that represents a fire scenario on a vehicle-deck aboard a RoPax ship. A statistical analysis technique was used to illustrate the ability of each fire model to predict five outputs of concern. The main conclusion of this comparison is that there is always an optimal fire model that can predict one or more of the five outputs of concern with results in good agreement with the measured values.
Źródło:
Polish Maritime Research; 2019, 2; 155-162
1233-2585
Pojawia się w:
Polish Maritime Research
Dostawca treści:
Biblioteka Nauki
Artykuł
Tytuł:
Monitoring of Land Surface Temperature from Landsat Imagery: A Case Study of Al-Anbar Governorate in Iraq
Autorzy:
Morsy, Salem
Ahmed, Shaker
Powiązania:
https://bibliotekanauki.pl/articles/2203961.pdf
Data publikacji:
2023
Wydawca:
Akademia Górniczo-Hutnicza im. Stanisława Staszica w Krakowie. Wydawnictwo AGH
Tematy:
land surface temperature
Landsat
single channel algorithm
NDVI
land use
land cover
classification
regression
Opis:
Land surface temperature (LST) estimation is a crucial topic for many applications related to climate, land cover, and hydrology. In this research, LST estimation and monitoring of the main part of Al-Anbar Governorate in Iraq is presented using Landsat imagery from five years (2005, 2010, 2015, 2016 and 2020). Images of the years 2005 and 2010 were captured by Landsat 5 (TM) and the others were captured by Landsat 8 (OLI/TIRS). The Single Channel Algorithm was applied to retrieve the LST from Landsat 5 and Landsat 8 images. Moreover, the land use/land cover (LULC) maps were developed for the five years using the maximum likelihood classifier. The difference in the LST and normalized difference vegetation index (NDVI) values over this period was observed due to the changes in LULC. Finally, a regression analysis was conducted to model the relationship between the LST and NDVI. The results showed that the highest LST of the study area was recorded in 2016 (min = 21.1°C, max = 53.2°C and mean = 40.8°C). This was attributed to the fact that many people were displaced and had left their agricultural fields. Therefore, thousands of hectares of land which had previously been green land became desertified. This conclusion was supported by comparing the agricultural land areas registered throughout the presented years. The polynomial regression analysis of LST and NDVI revealed a better coefficient of determination (R2) than the linear regression analysis with an average R2 of 0.423.
Źródło:
Geomatics and Environmental Engineering; 2023, 17, 3; 61--81
1898-1135
Pojawia się w:
Geomatics and Environmental Engineering
Dostawca treści:
Biblioteka Nauki
Artykuł
Tytuł:
A Study on the Effect of Operating Parameters on the Efficiency of a Mercury Removal Unit From Natural Gas
Autorzy:
Mohsen, Ahmed
Farouq, Rania
Farag, Hassan A.
Salem, Mostapha
Powiązania:
https://bibliotekanauki.pl/articles/396570.pdf
Data publikacji:
2019
Wydawca:
Uniwersytet Zielonogórski. Oficyna Wydawnicza
Tematy:
natural gas
mercury removal
adsorption
chemisorption
mathematical models
gaz ziemny
usuwanie rtęci
adsorpcja
chemisorpcja
modele matematyczne
Opis:
In this study, an industrial fixed-bed for mercury adsorption from natural gas, was evaluated by mathematical models. Equilibrium isotherms, kinetics equations, and adsorption models were applied to available data to evaluate sorbent characteristics, and then study bed’s performance under different case studies. Models solutions are evaluated by linear-regression and coefficient of determination. The study confirmed that the system is characterized by irreversible equilibrium. Examining of kinetics equations indicated the inclusion of chemisorption and intra-particle diffusion as ratelimiting steps. Bohart-Adams model was found the best fitting model with good match between model’s assumptions and available bed’s information. Model prediction for bed’s design-basis was examined and found good match with manufacturer’s data-sheet.
Źródło:
Civil and Environmental Engineering Reports; 2019, 29, 2; 117-155
2080-5187
2450-8594
Pojawia się w:
Civil and Environmental Engineering Reports
Dostawca treści:
Biblioteka Nauki
Artykuł
Tytuł:
Molecular screening of gastric Helicobacter pullorum recovered from different avian species in Egypt
Autorzy:
Elhelw, R.
Elhariri, M.
Salem, H.M.
Khalefa, H.S.
Hamza, D.A.
Ahmed, Z.S.
Powiązania:
https://bibliotekanauki.pl/articles/16539461.pdf
Data publikacji:
2022
Wydawca:
Polska Akademia Nauk. Czasopisma i Monografie PAN
Tematy:
Helicobacter pullorum
PCR
sequencing
chicken
resident wild birds
zoonoses
Egypt
Opis:
Helicobacter pullorum ( H. pullorum) is a bacterium that colonizes the intestines of poultry and causes gastroenteritis. Because these species are known as human and/or animal pathogens, identification of H. pullorum is becoming increasingly necessary. The bacterium has been linked to colitis and hepatitis in humans after being transmitted by infected meat consumption. Misdiagnosis of other enteric zoonotic pathogens such as Campylobacter and other Helicobacter species makes the diagnosis of H. pullorum extremely difficult. This study focused on the molecular detection of H. pullorum from the stomach (proventriculus and gizzard) of different avian species as new target organs for detection and transmission between avian species. Proventriculus and gizzards were obtained from 40 freshly dead chickens and resident wild birds (n=40). Diarrhea was found in the farms that were surveyed. DNA was extracted from all collected samples to conduct PCR amplification. The samples were screened for Helicobacter genus-specific 16s using C97 and C05 primers. To confirm the existence of H. pullorum, the positive samples were sequenced. H. pullorum was recorded in two out of 40 chicken samples. In addition, H. pullorum was recorded in one out of 40 resident wild birds. The 16S rRNA gene sequence for Helicobacter genus-specific in poultry and wild birds showed a 100% homology. In conclusion, broiler chickens and resident wild birds are possible reservoirs for H. pullorum, according to this report, and possibly act as a source of infection for humans via the food supply.
Źródło:
Polish Journal of Veterinary Sciences; 2022, 25, 3; 369-374
1505-1773
Pojawia się w:
Polish Journal of Veterinary Sciences
Dostawca treści:
Biblioteka Nauki
Artykuł
    Wyświetlanie 1-4 z 4

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