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Wyszukujesz frazę "Ibrahim, M.M." wg kryterium: Autor

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    Wyświetlanie 1-10 z 10
    Tytuł:
    Mitigation of blast load risk on reinforced concrete structures considering different design alternatives
    Autorzy:
    Ibrahim, Y. E.
    Almustafa, M.
    Powiązania:
    https://bibliotekanauki.pl/articles/230737.pdf
    Data publikacji:
    2020
    Wydawca:
    Polska Akademia Nauk. Czytelnia Czasopism PAN
    Tematy:
    obciążenie wybuchem
    rama żelbetowa
    wybuch
    łagodzenie skutków
    słup kompozytowy
    blast loading
    reinforced concrete frame
    blast
    mitigation
    composite column
    Opis:
    The purpose of this study is to investigate a structure’s response to blast loading when composite columns are used instead of conventional reinforced concrete (RC) cross sections and when a conventional structure is retrofitted with braces. The study includes conducting dynamic analyses on three different structures: a conventional reference RC structure, a modified structure utilizing composite columns, and a modified structure retrofitted with steel braces. The two modified structures were designed in order to investigate their performance when subjected to blast loading compared to the conventional design. During the dynamic analyses, the structures were exposed to simulated blast loads of multiple intensities using the finite-element modelling software, SeismoStruct. To evaluate their performance, the responses of the modified structures were analyzed and compared with the response of the conventional structure. It was concluded that both the structure with composite columns and the steel brace structure experienced less damage than the conventional model. The best performance was obtained through the steel brace structure.
    Źródło:
    Archives of Civil Engineering; 2020, 66, 3; 225-238
    1230-2945
    Pojawia się w:
    Archives of Civil Engineering
    Dostawca treści:
    Biblioteka Nauki
    Artykuł
    Tytuł:
    Implementation of Printed Small Size Dual Frequency Antenna in MHz Range
    Autorzy:
    Eldamak, Angie R.
    Ibrahim, Khalid M.
    Elkattan, Mohamed
    Powiązania:
    https://bibliotekanauki.pl/articles/225998.pdf
    Data publikacji:
    2019
    Wydawca:
    Polska Akademia Nauk. Czytelnia Czasopism PAN
    Tematy:
    dual frequency
    meander line
    MHz range
    monopole antenna
    Opis:
    This paper presents a printed dual band monopole antenna working below 250 MHz using meander line and an added stub. Meander line approach is used to reduce the size of the low frequency monopole. The proposed antenna is fed by microstrip line and printed on FR-4 substrate with an overall size of 290 x 83 mm2. The added stub tuned dual band operation at 114 MHz and 221 MHz with measured reflection coefficient of -19 dB at both bands. The antenna has omni-directional characteristics with efficiency greater than 90% and gain of 1.87, 1.7 dBi at both bands respectively. The antenna design is optimized through a detailed parametric study. This study includes varying stub, Meander, feed and ground dimensions. The antenna has been fabricated and measured where dual band operation in the MHz range is verified.
    Źródło:
    International Journal of Electronics and Telecommunications; 2019, 65, 4; 565-570
    2300-1933
    Pojawia się w:
    International Journal of Electronics and Telecommunications
    Dostawca treści:
    Biblioteka Nauki
    Artykuł
    Tytuł:
    A performance analysis of a hybrid golden section search methodology and a nature-inspired algorithm for MPPT in a solar PV system
    Autorzy:
    Mostafa, Hazem H.
    Ibrahim, Amr M.
    Anis, Wagdi R.
    Powiązania:
    https://bibliotekanauki.pl/articles/141645.pdf
    Data publikacji:
    2019
    Wydawca:
    Polska Akademia Nauk. Czytelnia Czasopism PAN
    Tematy:
    hybrid optimization
    golden sections search
    multi-verse optimization algorithm
    maximum power point tracking
    perturb and observe
    photovoltaic (PV)
    Opis:
    This research presents a comparative study for maximum power point tracking (MPPT) methodologies for a photovoltaic (PV) system. A novel hybrid algorithm golden section search assisted perturb and observe (GSS-PO) is proposed to solve the problems of the conventional PO (CPO). The aim of this new methodology is to boost the efficiency of the CPO. The new algorithm has a very low convergence time and a very high efficiency. GSS-PO is compared with the intelligent nature-inspired multi-verse optimization (MVO) algorithm by a simulation validation. The simulation study reveals that the novel GSS- PO outperforms MVO under uniform irradiance conditions and under a sudden change in irradiance.
    Źródło:
    Archives of Electrical Engineering; 2019, 68, 3; 611-627
    1427-4221
    2300-2506
    Pojawia się w:
    Archives of Electrical Engineering
    Dostawca treści:
    Biblioteka Nauki
    Artykuł
    Tytuł:
    Characterization of a molybdenum-reducing bacterium with the ability to degrade phenol, isolated in soils from Egypt
    Autorzy:
    Ibrahim, Y.
    Abdel-Mongy, M.
    Shukor, M.S.
    Hussein, S.
    Ling, A.P.K.
    Shukor, M.Y.
    Powiązania:
    https://bibliotekanauki.pl/articles/80115.pdf
    Data publikacji:
    2015
    Wydawca:
    Polska Akademia Nauk. Czytelnia Czasopism PAN
    Tematy:
    molybdenum
    molybdenum-reducing bacteria
    contaminated soil
    bioremediation
    nonylphenol
    phenol
    Egypt
    Źródło:
    BioTechnologia. Journal of Biotechnology Computational Biology and Bionanotechnology; 2015, 96, 3
    0860-7796
    Pojawia się w:
    BioTechnologia. Journal of Biotechnology Computational Biology and Bionanotechnology
    Dostawca treści:
    Biblioteka Nauki
    Artykuł
    Tytuł:
    A comparative study of 2DOF PID and 2DOF fractional order PID controllers on a class of unstable systems
    Autorzy:
    Bingi, K.
    Ibrahim, R.
    Karsiti, M. N.
    Hassan, S. M.
    Harindran, V. R.
    Powiązania:
    https://bibliotekanauki.pl/articles/229519.pdf
    Data publikacji:
    2018
    Wydawca:
    Polska Akademia Nauk. Czytelnia Czasopism PAN
    Tematy:
    fractional order controller
    set-point weighting
    2DOF PID
    process control
    unstable systems
    Opis:
    The proportional-integral-derivative (PID) controllers have experienced series of structural modifications and improvements. Example of such modifications are set-point weighting and fractional ordering. While the former is to achieve two-degree-of-freedom (2DOF) ability of set-point tracking and disturbance rejection, the latter is to ensure smooth control action. Therefore, this paper reviews various forms of PID controllers and provides a comparative analysis of 2DOF PID and 2DOF fractional order PID (FOPID) controllers. The paper also discusses the conversion of one PID form to another. For the comparative analysis of the various controllers, a class of unstable systems are considered. Simulation result shows that in most cases the conversion from one form to another does not significantly affect the performance of the system. It is also observed that the 2DOF controllers (2DOF PID and 2DOF FOPID) improved significantly the performance of the ordinary PID controllers.
    Źródło:
    Archives of Control Sciences; 2018, 28, 4; 635-682
    1230-2384
    Pojawia się w:
    Archives of Control Sciences
    Dostawca treści:
    Biblioteka Nauki
    Artykuł
    Tytuł:
    The cotton mealybug Phenacoccus solenopsis Tinsley (Hemiptera: Pseudococcidae) as a new insect pest on tomato plants in Egypt
    Autorzy:
    Ibrahim, S.S.
    Moharum, F.A.
    Abd El-Ghany, N.M.
    Powiązania:
    https://bibliotekanauki.pl/articles/65060.pdf
    Data publikacji:
    2015
    Wydawca:
    Polska Akademia Nauk. Czytelnia Czasopism PAN
    Opis:
    Recently, the mealybug Phenacoccus solenopsis Tinsley (Hemiptera: Pseudococcidae) was recorded as a new pest on tomato plants (Lycopersicon esculentum Mill) growing in Egypt. The mealybugs specimens were collected from tomato plants in the Qalyoubia governorate during summer season of 2014. The mealybug was identified as P. solenopsis based on the morphological characters and taxonomic key of this species. This study represents the first record of P. solenopsis as a new insect pest attacking tomato plants in Egypt.
    Źródło:
    Journal of Plant Protection Research; 2015, 55, 1
    1427-4345
    Pojawia się w:
    Journal of Plant Protection Research
    Dostawca treści:
    Biblioteka Nauki
    Artykuł
    Tytuł:
    Throughput, Spectral, and Energy Efficiency of 5G Massive MIMO Applications Using Different Linear Precoding Schemes
    Autorzy:
    Salah, Ibrahim
    Rahouma, Kamel Hussein
    Hussein, Aziza I.
    Mabrook, M. Mourad
    Powiązania:
    https://bibliotekanauki.pl/articles/2203002.pdf
    Data publikacji:
    2023
    Wydawca:
    Polska Akademia Nauk. Czytelnia Czasopism PAN
    Tematy:
    throughput
    massive MIMO
    spectral efficiency
    energy efficiency
    trade-off
    Opis:
    On fifth-generation wireless networks, a potential massive MIMO system is used to meet the ever-increasing request for high-traffic data rates, high-resolution streaming media, and cognitive communication. In order to boost the trade-off between energy efficiency (EE), spectral efficiency (SE), and throughput in wireless 5G networks, massive MIMO systems are essential. This paper proposes a strategy for EE 5G optimization utilizing massive MIMO technology. The massive MIMO system architecture would enhance the trade-off between throughput and EE at the optimum number of working antennas. Moreover, the EE-SE tradeoff is adjusted for downlink and uplink massive MIMO systems employing linear precoding techniques such as Multiple -Minimum Mean Square Error (M-MMSE), Regularized Zero Forcing (RZF), Zero Forcing (ZF), and Maximum Ratio (MR). Throughput is increased by adding more antennas at the optimum EE, according to the analysis of simulation findings. Next, utilizing M MMSE instead of RZF and ZF, the suggested trading strategy is enhanced and optimized. The results indicate that M-MMSE provides the best tradeoff between EE and throughput at the determined optimal ratio between active antennas and active users equipment’s (UE).
    Źródło:
    International Journal of Electronics and Telecommunications; 2023, 69, 1; 185--191
    2300-1933
    Pojawia się w:
    International Journal of Electronics and Telecommunications
    Dostawca treści:
    Biblioteka Nauki
    Artykuł
    Tytuł:
    Extraction of Tannic Acid from Kenaf Bast Fibre using Ultrasonic Assisted Extraction
    Autorzy:
    Mohamad, Mardawani
    Ibrahim, H. A.
    Nasir, M. F. M.
    Mohidem, Nur Atikah
    Shoparwe, N. F.
    Teo, Pao Ter
    Masri, Mohamad Najmi
    Irfan, Abd Rahim
    Powiązania:
    https://bibliotekanauki.pl/articles/2134102.pdf
    Data publikacji:
    2022
    Wydawca:
    Polska Akademia Nauk. Czytelnia Czasopism PAN
    Tematy:
    ultrasonic assisted extraction
    UAE
    sonication time
    duty cycle
    extraction process
    kenaf bast fibre
    Opis:
    Tannic acid or tannin, type of phenolic compound contains in kenaf bast fibre. Conventional extraction has certain limitations in terms of time, energy, and solvent consumption. Ultrasound assisted extraction (UAE) can extract bioactive components in shorter time, low temperature, with lesser energy and solvent requirement. UAE as alternative extraction technique is better equipped to retain the functionality of the bioactive compounds. In this study, the conditions for ultrasound assisted extraction (UAE) of tannic acid from kenaf bast fibre by assessing the effect of sonication time and different duty cycles were optimized. The use of ultrasound to extract tannic acid from kenaf bast fiber was evaluated. Ultrasound-assisted extraction (UAE) was carried out using ethanol as solvent to intensify the extraction efficacy. Phytochemical screening was conducted to identify the presence of tannic acid in extracts. The extracts then were analyzed using High-Performance Liquid Chromatography (HPLC) and Scanning Electron Microscopy (SEM). It was found that 0.2429 mg/mL of tannic acid was obtained under the extraction conditions of extraction temperature of 40℃, sonication time of 20 minutes and duty cycle of 50%. From SEM analysis, it was found that the raw sample demonstrated rough surface and no porous but kenaf bast fibre display smoother surface with less impurities and few pores appeared after the extraction process using UAE. These results indicate that ultrasound-assisted extraction is an efficient method for extracting tannic acid from kenaf bast fibre with the advantages of lower extraction time and higher extraction yield.
    Źródło:
    Archives of Metallurgy and Materials; 2022, 67, 3; 1061--1066
    1733-3490
    Pojawia się w:
    Archives of Metallurgy and Materials
    Dostawca treści:
    Biblioteka Nauki
    Artykuł
    Tytuł:
    Structured Analysis of Nanostructured Zinc Oxide (ZnO) Thin Films Deposited by Sol-Gel
    Autorzy:
    Hussin, Rosniza
    Hanafi, F.
    Rashid, R. A.
    Harun, Z.
    Kamdi, Z.
    Ibrahim, S. A.
    Ainuddin, A. R.
    Rahman, W.
    Leman, A. M.
    Powiązania:
    https://bibliotekanauki.pl/articles/2134100.pdf
    Data publikacji:
    2022
    Wydawca:
    Polska Akademia Nauk. Czytelnia Czasopism PAN
    Tematy:
    sol-gel
    zinc oxide
    ZnO
    thin films
    nanostructured
    Opis:
    In this work, zinc oxide (ZnO) thin films are deposited on glass substrate using the sol-gel spin coating technique. The effect of annealing temperature on structural properties was investigated. The ZnO sol-gel was produced from zinc acetate dehydrate as the starting material with iso-propanol alcohol as the stabilizer. The ratio was controlled, distilled water and diethanolamine as the solvent mixing on a magnetic stirrer for an hour under constant heat of 60°C. The ZnO thin film was deposited using the spin coating technique with the speed of 3000 rpm for 30 minutes before the sample undergoes pre-heat in the oven at the temperature of 100°C for 10 minutes. The sample was annealing in the furnace for an hour at 200°C, 350°C, and 500°C. The X-ray diffraction (XRD) analysis confirms that hexagonal wurtzite structure with zincite and zinc acetate hydroxide hydrate composition. The thin films surface roughness was analyzed using an atomic force microscope (AFM) and scanning electron microscope (SEM) for surface morphology observation.
    Źródło:
    Archives of Metallurgy and Materials; 2022, 67, 3; 1055--1060
    1733-3490
    Pojawia się w:
    Archives of Metallurgy and Materials
    Dostawca treści:
    Biblioteka Nauki
    Artykuł
    Tytuł:
    Removal of Cadmium using Alkaline-Treated Activated Carbon from Leucaena Leucocephala Biomass
    Autorzy:
    Ibrahim, W. M. H. W.
    Sulaiman, Nurul Syuhada
    Amini, Mohd Hazim Mohammad
    Kadir, W. R. A.
    Mohamed, Mazlan
    Ramle, Sitti Fatimah Mhd
    Bilgin, Ugur
    Rahman, Wan
    Powiązania:
    https://bibliotekanauki.pl/articles/2125550.pdf
    Data publikacji:
    2022
    Wydawca:
    Polska Akademia Nauk. Czytelnia Czasopism PAN
    Tematy:
    activated carbon
    cadmium
    Leucaena leucocephala
    adsorption
    Opis:
    Water contamination that caused by heavy metals is a very common phenomenon in the industrial age. One of the popular way to treat metal contaminated water is by adsorption process using activated carbon as the adsorbent. This paper works on producing activated carbon by chemical means with impregnation ratios of NaOH:char (w/w) was predetermined at 1:1 (ACT1-1), 2:1 (ACT2-1) and 3:1 (ACT3-1) under activation temperature of 700°C. Considering the Leucaena leucocephala is a wildly, easy and fast grown species, with the availability throught the year, it was chosen to be used as the precursor. The properties of these activated carbons and its potential for cadmium removal from aqueus solution was analyzed. It was found that the highest surface area was recorded at 662.76 m²/g. Four parameters were studied which are contact time, the effect of pH, initial concentration of adsorbate and temperature. The equilibrium time was achieved in 40 min treatment at initial concentrations of 30 mg/l. The adsorbent exhibited good sorption potential for cadmium at pH 8.0 and equilibrium temperature of 30℃. Based on the results, this study had proved that activated carbon from Leucaena leucocephala biomass have the good potential to be used for removal of cadmium from wastewater.
    Źródło:
    Archives of Metallurgy and Materials; 2022, 67, 3; 1033--1036
    1733-3490
    Pojawia się w:
    Archives of Metallurgy and Materials
    Dostawca treści:
    Biblioteka Nauki
    Artykuł
      Wyświetlanie 1-10 z 10

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