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Wyszukujesz frazę "Ahmed, Saleh" wg kryterium: Autor

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    Wyświetlanie 1-6 z 6
    Tytuł:
    Design and analysis of a graphene-based Tera-Hertz antenna with lower complexities
    Autorzy:
    Islam, Md. Mashrur
    Ahmed, Saleh
    Mahmud, Nadim
    Powiązania:
    https://bibliotekanauki.pl/articles/1075613.pdf
    Data publikacji:
    2019
    Wydawca:
    Przedsiębiorstwo Wydawnictw Naukowych Darwin / Scientific Publishing House DARWIN
    Tematy:
    Graphene
    PEC
    THz
    brain imaging
    Opis:
    A graphene based rectangular patch antenna is designed at .979 THz with a return loss of -20 & VSWR of 2.1. A comparison of patch between graphene & its counterparts is investigated & found the superiority of graphene over PEC & Copper. This type of patch antenna can be used for future THz brain imaging.
    Źródło:
    World Scientific News; 2019, 125; 18-31
    2392-2192
    Pojawia się w:
    World Scientific News
    Dostawca treści:
    Biblioteka Nauki
    Artykuł
    Tytuł:
    Satellite Image Fusion Using a Hybrid Traditional and Deep Learning Method
    Autorzy:
    Hammad, Mahmoud M.
    Mahmoud, Tarek A.
    Amein, Ahmed Saleh
    Ghoniemy, Tarek S.
    Powiązania:
    https://bibliotekanauki.pl/articles/27314300.pdf
    Data publikacji:
    2023
    Wydawca:
    Akademia Górniczo-Hutnicza im. Stanisława Staszica w Krakowie. Wydawnictwo AGH
    Tematy:
    deep learning image fusion
    remote sensing image fusion
    remote sensing optical image
    pan-sharpening
    remote sensing image
    Opis:
    Due to growing demand for ground-truth in deep learning-based remote sensing satellite image fusion, numerous approaches have been presented. Of these approaches, Wald’s protocol is the most commonly used. In this paper, a new workflow is proposed consisting of two main parts. The first part targets obtaining the ground-truth images using the results of a pre-designed and well-tested hybrid traditional fusion method. This method combines the Gram–Schmidt and curvelet transform techniques to generate accurate and reliable fusion results. The second part focuses on the training of a proposed deep learning model using rich and informative data provided by the first stage to improve the fusion performance. The demonstrated deep learning model relies on a series of residual dense blocks to enhance network depth and facilitate the effective feature learning process. These blocks are designed to capture both low-level and high-level information, enabling the model to extract intricate details and meaningful features from the input data. The performance evaluation of the proposed model is carried out using seven metrics such as peak-signal-to-noise-ratio and quality without reference. The experimental results demonstrate that the proposed approach outperforms state-of-the-art methods in terms of image quality. It also exhibits the robustness and powerful nature of the proposed approach which has the potential to be applied to many remote sensing applications in agriculture, environmental monitoring, and change detection.
    Źródło:
    Geomatics and Environmental Engineering; 2023, 17, 5; 145--162
    1898-1135
    Pojawia się w:
    Geomatics and Environmental Engineering
    Dostawca treści:
    Biblioteka Nauki
    Artykuł
    Tytuł:
    Performance Enhancement of Cooperative MIMO-NOMA Systems Over Sub-6 GHz and mmWave Bands
    Autorzy:
    Saleh, Ahmed A.
    Ahmed, Mohamad A.
    Powiązania:
    https://bibliotekanauki.pl/articles/24200732.pdf
    Data publikacji:
    2023
    Wydawca:
    Instytut Łączności - Państwowy Instytut Badawczy
    Tematy:
    error probability
    MIMO
    mmWave
    NOMA
    out-age probability
    power allocation factor
    successive-interference cancellation (SIC
    Opis:
    In this paper, two radio links with different frequency bands are considered for base stations (BS) serving users via decode-and-forward (DF) cooperative relays. Backhaul and access links are proposed with sub-6 GHz and millimeter wave (mmWave) bands, respectively. Non-orthogonal multiple access (NOMA) is employed in the backhaul link to simultaneously transmit a superposed signal in the power domain, using the same band. The superposed signals, containing two signals that differ in terms of power allocation factors (PAFs), are designed for two selected DF relays in the BS. The two relays are chosen from several relays to be serviced by the BS based on a pairing algorithm that depends on different users’ circumstances. The furthest DF relay detects the incoming NOMA signal directly, while the nearest one applies successive interference cancellation (SIC) before extracting its signal. Each DF relay forwards the detected signals toward their intended users over mmWave channels. Three performance metrics are utilized to evaluate the system’s performance: outage probability, achievable throughput, and bit error rate. Comparisons between two mmWave bands in the access link (28 and 73 GHz) are made to demonstrate the superiority of the 28 GHz band in terms of the three performance-related metrics.
    Źródło:
    Journal of Telecommunications and Information Technology; 2023, 2; 70--77
    1509-4553
    1899-8852
    Pojawia się w:
    Journal of Telecommunications and Information Technology
    Dostawca treści:
    Biblioteka Nauki
    Artykuł
    Tytuł:
    A Critical Discourse Analysis of Reports on “Bring Back our Girls” Campaign in Nigerian Newspapers
    Autorzy:
    Bashir, Abdullahi Saleh
    Ahmed, Umar
    Powiązania:
    https://bibliotekanauki.pl/articles/513811.pdf
    Data publikacji:
    2019-06-30
    Wydawca:
    Akademia Pedagogiki Specjalnej. Language and Society Research Committee
    Tematy:
    Campaign
    Critical Discourse Analysis
    Boko Haram
    Nigeria
    Opis:
    This paper analyses news reports of “Bring Back Our Girls” campaign in Nigerian newspapers. The “Bring Back Our Girls” advocacy group was formed to pressure the Nigerian government to intensify efforts to rescue the over two hundred school girls abducted by Boko Haram insurgents at Chibok, Borno State, north east Nigeria. The abduction which took place in April 2014 and the subsequent campaign to release the girls received global media attention including many newspapers in the country. The study therefore analyses the schematic directions, discursive strategies and context of the discourse reports of “Bring Back Our Girls” campaigns in Nigerian newspapers using critical discourse analysis. The corpus was purposively selected from three nationally circulating newspapers: Leadership, New Telegraph and Daily Trust published from1st May to 31st July, 2014. Descriptive design was adopted using Fairclough (1995) model of critical discourse analysis. Findings show that narration and criticism constitute the dominant schematic directions of newspaper reports of the campaign; on the discursive strategy, it is found out that rationalization, narrativisation and argumentation account for 80% of the discourse and the context revealed that there is negative use of language because the campaigners and the then government of the day were loggerheads over the issue. The study concludes that due to high prevalence of criticism and rationalization in the corpus, the discourse the text of newspaper report of Bring Back Our Girls campaign largely reflected the narrative and argument of the group against the government which has responsibility to protect and rescue the abducted girls.
    Źródło:
    Language, Discourse & Society; 2019, 7, 1; 215-237
    2239-4192
    Pojawia się w:
    Language, Discourse & Society
    Dostawca treści:
    Biblioteka Nauki
    Artykuł
    Tytuł:
    Evaluating the connectivity level of Fayoum city roads network: a new method using GIS
    Ocena poziomu spójności sieci dróg miejskich Fayoum: nowa metoda wykorzystująca GIS
    Autorzy:
    Saleh, Ahmed Younes
    Abdu, Saeed Ahmed
    Ali, Hanaa Nazer
    Powiązania:
    https://bibliotekanauki.pl/articles/2089773.pdf
    Data publikacji:
    2018
    Wydawca:
    Uniwersytet Gdański. Komisja Geografii Komunikacji Polskiego Towarzystwa Geograficznego
    Tematy:
    connectivity level
    GIS
    map algebra
    network analysis
    urban road network
    poziom spójności
    algebra mapy
    analiza sieci
    sieć dróg miejskich
    Opis:
    Road networks within cities are a vital component of the socio-economic development processes. Many countries have sought to examine and evaluate the efficiency of road networks within urban areas because of the increasing demand for transportation. Thus, networks should be evaluated to guide the development of transport systems and infrastructure within cities. This study evaluates the connectivity level of the road network parts in Fayoum city, Egypt, through the application of some indicators of connectivity measurement, such as Beta, Alpha, Gamma, Connectivity degree, and the density of edges and nodes. The study follows a new method for evaluation; it does not apply the indicators on the network as a whole; however, it divides the city into zones and calculates the indicators of each zone using the Arc GIS 10.2.1 program. The authors applied the map Algebra method to map the results of the six indicators in one index called the Total Connectivity Index (TCI). The TCI gives more consistent results than other indices, and it is more related to different spatial patterns of roads. According to this indicator, most of the city road network seem to have a good connectivity level, whereas the city marginal areas prove to have a poor connectivity level. Therefore, any efforts to develop or construct new roads should be in the marginal areas of the city.
    Źródło:
    Prace Komisji Geografii Komunikacji PTG; 2018, 21(4); 60-72
    1426-5915
    2543-859X
    Pojawia się w:
    Prace Komisji Geografii Komunikacji PTG
    Dostawca treści:
    Biblioteka Nauki
    Artykuł
    Tytuł:
    A study on microbial self-healing concrete using expanded perlite
    Autorzy:
    Amjad, Usama Bin
    Siddique, Muhammad Shahid
    Shahid, Taha
    Ahmed, Iftikhar
    Alogla, Saleh M.
    Ahmad, Jawad
    Powiązania:
    https://bibliotekanauki.pl/articles/27311428.pdf
    Data publikacji:
    2023
    Wydawca:
    Polska Akademia Nauk. Czasopisma i Monografie PAN
    Tematy:
    concrete
    self-healing
    bacteria
    expanded perlite
    crack detection
    beton
    bakteria
    wykrywanie pęknięć
    samonaprawialność
    perlit ekspandowany
    Opis:
    The increasing concern for the safety and sustainability of structures is calling for the development of smart self-healing materials and preventive repair methods. This research is carried out to investigate the extent of self-healing in normal-strength concrete by using Sporosarcina aquimarina – NCCP-2716 immobilized in expanded perlite (EP) as the carrier. The efficacy of crack-healing was also tested using two alternative self-healing techniques, i.e. expanded perlite (EP) concrete and direct introduction of bacteria in concrete. A bacterial solution was embedded in EP and calcium lactate pentahydrate was added as the nutrient. Experiments revealed that specimens containing EP-immobilized bacteria had the most effective crack-healing. After 28 days of healing, the values of completely healed crack widths were up to 0.78 mm, which is higher than the 0.5 mm value for specimens with the direct addition of bacteria. The specimen showed a significant self-healing phenomenon caused by substantial calcite precipitation by bacteria. The induced cracks were observed to be repaired autonomously by the calcite produced by the bacteria without any adverse effect on strength. The results of this research could provide a scientific foundation for the use of expanded perlite as a novel microbe carrier and Sporosarcina aquimarina as a potential microbe in bacteria-based self-healing concrete.
    Źródło:
    Bulletin of the Polish Academy of Sciences. Technical Sciences; 2023, 71, 5; art. no. e146475
    0239-7528
    Pojawia się w:
    Bulletin of the Polish Academy of Sciences. Technical Sciences
    Dostawca treści:
    Biblioteka Nauki
    Artykuł
      Wyświetlanie 1-6 z 6

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