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Wyszukujesz frazę "Farag, A." wg kryterium: Autor

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    Wyświetlanie 1-6 z 6
    Tytuł:
    Influence of Temperature and Illumination on the Electrical Characteristics of Nanocrystalline $Cu_2S$ Based Heterojunctions for Photodetector Application
    Autorzy:
    Soliman, H.
    Farag, A.
    Saadeldin, M.
    Sawaby, K.
    Powiązania:
    https://bibliotekanauki.pl/articles/1400523.pdf
    Data publikacji:
    2015-06
    Wydawca:
    Polska Akademia Nauk. Instytut Fizyki PAN
    Tematy:
    73.40.Ei
    73.50.Pz
    Opis:
    In this work, heterojunctions of $Cu_2S//p-Si$ were prepared by high vacuum thermal evaporation technique and examined as a photodetector structure. The dark current-voltage (I-V) characteristics of the heterojunctions measured at different temperatures ranging from 303 to 373 K were investigated. The predominant conduction mechanisms, series resistance, ideality factor and potential barrier height were determined. The downward curvature at sufficiently large voltages in the I-V characteristics is caused by the effect of series resistance $R_{s}$. The ideality factor obtained from I-V characteristics is larger than unity which can be attributed to the presence of a thin interfacial insulator layer between the metal and semiconductor. The photocurrent properties of the device under reverse bias using various illuminations were also explored for checking the validity of photodetector application of the studied device. The responsivity of light for the device under reverse bias confirms that the $Cu_2S//p-Si$ heterojunctions are valid for photodetector application. Moreover, these results suggest that the fabricated diode can be used for optical sensor applications. The capacitance-voltage characteristics of diode were also investigated at high frequency of 1 MHz.
    Źródło:
    Acta Physica Polonica A; 2015, 127, 6; 1688-1693
    0587-4246
    1898-794X
    Pojawia się w:
    Acta Physica Polonica A
    Dostawca treści:
    Biblioteka Nauki
    Artykuł
    Tytuł:
    Ground States of Helium Atom and Hydrogen Negative Ion in the Presence of Magnetic Field Using Variational Monte Carlo Technique
    Autorzy:
    Doma, S.
    Shaker, M.
    Farag, A.
    El-Gammal, F.
    Powiązania:
    https://bibliotekanauki.pl/articles/1205020.pdf
    Data publikacji:
    2014-08
    Wydawca:
    Polska Akademia Nauk. Instytut Fizyki PAN
    Tematy:
    31.10.+z
    31.15.-p
    31.15.V-
    31.15.xt
    Opis:
    Using variational Monte Carlo method, we calculated the $1^1 0^{+}$ state energies, the derivatives of the total energy and the ionisation energies of the helium atom, and hydrogen negative ion in the presence of magnetic field regime between 0 a.u. and 10 a.u. Our calculations are based on using two types of compact and accurate trial wave functions used before to calculate energies in the absence of magnetic field. Our results are in good agreement with the most recent previous accurate values and also with the exact values.
    Źródło:
    Acta Physica Polonica A; 2014, 126, 3; 700-704
    0587-4246
    1898-794X
    Pojawia się w:
    Acta Physica Polonica A
    Dostawca treści:
    Biblioteka Nauki
    Artykuł
    Tytuł:
    Enhancement of fungal DNA templates and PCR amplification yield by three types of nanoparticles
    Autorzy:
    Al-Dhabaan, F.A.
    Yousef, H.
    Shoala, T.
    Shaheen, J.
    El Sawi, Y.
    Farag, T.
    Powiązania:
    https://bibliotekanauki.pl/articles/65369.pdf
    Data publikacji:
    2018
    Wydawca:
    Polska Akademia Nauk. Czytelnia Czasopism PAN
    Tematy:
    plant pathology
    detection
    identification
    plant pathogen
    toxigenic fungi
    improvement
    specificity
    efficiency
    polymerase chain reaction
    Alternaria alternata
    DNA extraction
    nanoparticle
    Rhizoctonia solani
    nanobiotechnology
    Opis:
    Nanodiagonastic methods in plant pathology are used for enhancing detection and identification of different plant pathogens and toxigenic fungi. Improvement of the specificity and efficiency of the polymerase chain reaction (PCR) by using some nanoparticles is emerging as a new area of research. In the current research, silver, zinc, and gold nanoparticles were used to increase the yield of DNA for two plant pathogenic fungi including soil-borne fungus Rhizoctonia solani and toxigenic fungus Alternaria alternata. Gold nanoparticles combined with zinc and silver nanoparticles enhanced both DNA yield and PCR products compared to DNA extraction methods with ALB buffer, sodium dodecyl sulfate, ALBfree from protinase K, ZnNPs and AgNPs. Also, by using ZnNPs and AgNPs the DNA yield was enhanced and the sensitivity of random amplified polymorphic DNA (RAPD) PCR products was increased. Application of nanomaterials in the PCR reaction could increase or decrease the PCR product according to the type of applied nanometal and the type of DNA template. Additions of AuNPs to PCR mix increased both sensitivity and specificity for PCR products of the tested fungi. Thus, the use of these highly stable, commercially available and inexpensive inorganic nano reagents open new opportunities for improving the specificity and sensitivity of PCR amplicon, which is the most important standard method in molecular plant pathology and mycotoxicology.
    Źródło:
    Journal of Plant Protection Research; 2018, 58, 1
    1427-4345
    Pojawia się w:
    Journal of Plant Protection Research
    Dostawca treści:
    Biblioteka Nauki
    Artykuł
    Tytuł:
    Electrical Characterization of Al/$Ta_2O_5$/Al Structures Grown by Electron Beam Deposition
    Autorzy:
    Yahia, I.
    Farag, A.
    Powiązania:
    https://bibliotekanauki.pl/articles/1365248.pdf
    Data publikacji:
    2014-05
    Wydawca:
    Polska Akademia Nauk. Instytut Fizyki PAN
    Tematy:
    77.84.Bw
    77.55.-g
    81.10.Bk
    85.30.Kk
    85.30.-z
    Opis:
    We report study of current density-voltage (J-V) and capacitance-voltage (C-V) characteristics of Al/$Ta_2O_5$/Al metal-insulator-metal structures prepared by electron beam deposition. At low bias voltages the J-V characteristics of Al/$Ta_2O_5$/Al structures show ohmic conduction. At higher voltages the conductivity becomes limited by space charge. The space charge limited conductivity is due to carrier trap centers located within the energy gap of $Ta_2O_5$. The distribution of the trap appears to be exponential above the valence band. Basing on the comparison of the measured temperature dependences of the current density with the theoretical model one can determine important material parameters, such as the trap density. The density of states at the Fermi level $N(E_{F})$ for the $Ta_2O_5$ film is found to be 2.75 × $10^{19} eV^{-1} cm^{-3}$. The capacitance-voltage-temperature (C-V-T) characteristics of Al/$Ta_2O_5$/Al structures were carried out in the bias range -5 to +5 V and at temperatures from 300 to 550 K. The capacitance of Al/$Ta_2O_5$/Al structures increases with the increasing temperature.
    Źródło:
    Acta Physica Polonica A; 2014, 125, 5; 1191-1196
    0587-4246
    1898-794X
    Pojawia się w:
    Acta Physica Polonica A
    Dostawca treści:
    Biblioteka Nauki
    Artykuł
    Tytuł:
    CFD modeling of syngas combustion and emissions for marine gas turbine applications
    Autorzy:
    Ammar, N. R.
    Farag, A. I.
    Powiązania:
    https://bibliotekanauki.pl/articles/259882.pdf
    Data publikacji:
    2016
    Wydawca:
    Politechnika Gdańska. Wydział Inżynierii Mechanicznej i Okrętownictwa
    Tematy:
    CFD
    syngas fuel
    combustion characteristics
    exhaust gas emissions
    Opis:
    Strong restrictions on emissions from marine power plants will probably be adopted in the near future. One of the measures which can be considered to reduce exhaust gases emissions is the use of alternative fuels. Synthesis gases are considered competitive renewable gaseous fuels which can be used in marine gas turbines for both propulsion and electric power generation on ships. The paper analyses combustion and emission characteristics of syngas fuel in marine gas turbines. Syngas fuel is burned in a gas turbine can combustor. The gas turbine can combustor with swirl is designed to burn the fuel efficiently and reduce the emissions. The analysis is performed numerically using the computational fluid dynamics code ANSYS FLUENT. Different operating conditions are considered within the numerical runs. The obtained numerical results are compared with experimental data and satisfactory agreement is obtained. The effect of syngas fuel composition and the swirl number values on temperature contours, and exhaust gas species concentrations are presented in this paper. The results show an increase of peak flame temperature for the syngas compared to natural gas fuel combustion at the same operating conditions while the NO emission becomes lower. In addition, lower CO2 emissions and increased CO emissions at the combustor exit are obtained for the syngas, compared to the natural gas fuel.
    Źródło:
    Polish Maritime Research; 2016, 3; 39-49
    1233-2585
    Pojawia się w:
    Polish Maritime Research
    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
      Wyświetlanie 1-6 z 6

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