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    Wyświetlanie 1-3 z 3
    Tytuł:
    Assessment of a Mining-Waste Dump of Galena Mine in the East of Morocco for Possible Use in Civil Engineering
    Autorzy:
    El Khazanti, Faiçal
    Rachid, Ahmed
    Harrou, Achraf
    Nasri, Hicham
    Et-tayea, Yassine
    El Ouahabi, Meriam
    Gharibi, El Khadir
    Powiązania:
    https://bibliotekanauki.pl/articles/2086353.pdf
    Data publikacji:
    2022
    Wydawca:
    Polskie Towarzystwo Inżynierii Ekologicznej
    Tematy:
    mining waste
    civil engineering
    environment
    masonry mortar
    Touissit
    Opis:
    Mining dumps, particularly inactive or abandoned mines located near makeshift mining towns, have significant environmental and social impacts. The Touissit-Boubker lead mine, operated for years by the Touissit Mining Company (CMT) and abandoned without rehabilitation, is an example of this socio-economic and environmental collapse. Large quantities of harmful solid waste containing clayey aggregates rich in lead sulphide have been dumped in dykes on the edge of the village of Touissit. These mining wastes were rewashed to extract galena causing a depletion of lead sulphide. The objective of this study is to evaluate the possibility of using washed mining waste as sandy aggregate for the manufacture of masonry mortar. Cylindrical mortar tests, made with various proportions of sand and mine waste were characterized by X-ray diffraction, scanning electron microscopy and mechanical analysis by uni-axial compressive strength after curing for 3, 14, 28 and 60 days. The results obtained revealed that the mining waste consists of dolomite, quartz and clay. The dehydration rate of the mortar specimens is strongly affected by the amount of the waste added and the grain size. The mechanical strength of the mortar specimens mostly depends on the grain-size of the aggregates than on the amount of mine waste added. The microstructure of the mortar did not change when sand was replaced by mine waste of the same grain size.
    Źródło:
    Journal of Ecological Engineering; 2022, 23, 4; 336--349
    2299-8993
    Pojawia się w:
    Journal of Ecological Engineering
    Dostawca treści:
    Biblioteka Nauki
    Artykuł
    Tytuł:
    A Novel Kernel Algorithm for Finite Impulse Response Channel Identification
    Autorzy:
    Fateh, Rachid
    Darif, Anouar
    Boumezzough, Ahmed
    Safi, Said
    Frikel, Miloud
    Powiązania:
    https://bibliotekanauki.pl/articles/24200741.pdf
    Data publikacji:
    2023
    Wydawca:
    Instytut Łączności - Państwowy Instytut Badawczy
    Tematy:
    finite impulse response
    kernel adaptive filtering
    kernel recursive projection identification
    nonlinear system identification
    Opis:
    Over the last few years, kernel adaptive filters have gained in importance as the kernel trick started to be used in classic linear adaptive filters in order to address various regression and time-series prediction issues in nonlinear environments.In this paper, we study a recursive method for identifying finite impulse response (FIR) nonlinear systems based on binary-value observation systems. We also apply the kernel trick to the recursive projection (RP) algorithm, yielding a novel recursive algorithm based on a positive definite kernel. For purposes, our approach is compared with the recursive projection (RP) algorithm in the process of identifying the parameters of two channels, with the first of them being a frequency-selective fading channel, called a broadband radio access network (BRAN B) channel, and the other being a a theoretical frequency-selective channel, known as the Macchi channel. Monte Carlo simulation results are presented to show the performance of the proposed algorithm.
    Źródło:
    Journal of Telecommunications and Information Technology; 2023, 2; 84--93
    1509-4553
    1899-8852
    Pojawia się w:
    Journal of Telecommunications and Information Technology
    Dostawca treści:
    Biblioteka Nauki
    Artykuł
    Tytuł:
    Diagnosis of dyslexic disorders and identification of factors associated with reading learning disabilities within the Moroccan context
    Autorzy:
    Ihbour, Said
    Hnini, Rachid
    Anarghou, Hammou
    Ahami, Ahmed Tohami
    Chigr, Fatiha
    Najimi, Mohamed
    Powiązania:
    https://bibliotekanauki.pl/articles/2106141.pdf
    Data publikacji:
    2019-11-08
    Wydawca:
    Fundacja Edukacji Medycznej, Promocji Zdrowia, Sztuki i Kultury Ars Medica
    Tematy:
    Learning
    Reading
    Diagnosis
    Dyslexic disorders
    Morocco
    Opis:
    Reading acquisition disorders constitute the main problem in children's learning. in Morocco, epidemiological data are very rare. Research, mainly in the English language, concerns either the sociological or the cognitive field. Few studies, among them not one in Arabic, have explored the link relating to social and cognitive factors. The purpose of our work is to study and analyze the cognitive and social variables related to different reading skills among Moroccan pupils in primary and secondary public schools. From a sample of 754 learners (388 boys and 366 girls) ranging in age from 9 to 15 years with an average of 11.59 years, the diagnostic tests identified 145 students with deficient skills "Bad readers (BR)," 128 suspected of being in difficulty classified as « intermediate level (IL) » and a group of 481 children as good readers ( GR). Statistical analyses have shown that the first two groups (BR and IL) represent 24% in the favoured areas compared to 43% in the disadvantaged. The analysis of scores and the nature of the errors made on various reading tests show that 41 students, or 5.43% of our sample, present a dyslexia profile. 13 (1.72%) of whom have very severe difficulties. The phonological aptitudes (Rapid automatized naming, phonological short-time memory and especially phonological awareness) mainly reflect the level of reading. These phonological abilities are highly influenced by early attendance of preschool and by the degree of exposure to written language at home. These data, which are unique in Morocco, are consistent to that of the published subject literature. They make it possible to plan preventive actions by generalizing pre-school teaching, particularly in precarious environments. These actions should be based on playful exercises aimed at improving phonological abilities at an early age, while exploiting the brain sensitivity to reading at that age. Phonological awareness and rapid naming are the most implicated factors in the disparity of reading skills. These abilities are highly influenced by the integration of preschool at a very early age and by the degree of exposure to written language activities. Therefore, there is a need to plan preventive actions, based on playful exercises, aiming to improve phonological skills from the pre-school period
    Źródło:
    Acta Neuropsychologica; 2019, 17(3); 261-281
    1730-7503
    2084-4298
    Pojawia się w:
    Acta Neuropsychologica
    Dostawca treści:
    Biblioteka Nauki
    Artykuł
      Wyświetlanie 1-3 z 3

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