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Wyszukujesz frazę "Hashim, Ahmad Mustafa" wg kryterium: Autor

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    Wyświetlanie 1-3 z 3
    Tytuł:
    Land-use Assessment and its Influence on Spatial Distribution of Rainfall Erosivity: Case Study of Cameron Highlands Malaysia
    Autorzy:
    Ul Mustafa, Muhammad Raza
    Sholagberu, Abdulkadir Taofeeq
    Syazwan, Muhammad Asyraf
    Yusof, Khamaruzaman Wan
    Hashim, Ahmad Mustafa
    Abdurrasheed, Abdurrasheed S.
    Powiązania:
    https://bibliotekanauki.pl/articles/124485.pdf
    Data publikacji:
    2019
    Wydawca:
    Polskie Towarzystwo Inżynierii Ekologicznej
    Tematy:
    land-use
    land cover
    erosivity
    Cameron Highlands
    GIS
    Opis:
    Over the years, Cameron Highlands have witnessed extensive land-use and land-cover (LULC) changes due to the massive agricultural and urbanization activities. This significantly contributed to the erosion problems in the area. Rainfall erosivity that measures the aggressiveness of raindrop in triggering soil erosion is one of its major components that could be influenced by the LULC changes in watersheds. However, the research relating to the LULC changes with the erosivity especially in the complex landscape is scarce. Hence, this study applies geographic information system (GIS) and remote sensing techniques to assess the LULC changes and their influence on the rainfall erosivity distribution in mountainous watershed of Cameron Highlands. Four Landsat images and the rainfall data from the period of thirty years were analysed for the development of LULC and erosivity maps respectively in ArcGIS environment. The study showed that the study area experienced immense land-use changes especially in agriculture and urbanization which affected the erosivity distribution. The LULC change for agriculture increased linearly in the last 30 years from 7.9% in 1986 to almost 16.4% in 2016. The results showed that urban development increased from 5.1% in 1986 to 11.4% in 2016. The increasing urbanization trend was targeted to meet up with tourism requirement in Cameron Highlands. However, forest class declined tremendously due to the exploration of land for agriculture practice and other various types of development. Watershed managers and other stakeholders should find this study beneficial in tackling erosion and its associated ecological challenges.
    Źródło:
    Journal of Ecological Engineering; 2019, 20, 2; 183-190
    2299-8993
    Pojawia się w:
    Journal of Ecological Engineering
    Dostawca treści:
    Biblioteka Nauki
    Artykuł
    Tytuł:
    Review on Mechanical Properties of Metakaolin Geopolymer Concrete by Inclusion of Steel Fibers
    Autorzy:
    Faris, Meor Ahmad
    Mohd Mustafa Al Bakri, Abdullayh
    Muniandy, Ratnasamy
    Ramasamy, Shamala
    Abu Hashim, Mohammad Firdaus
    Junaedi, Subaer
    Sandu, Andrei Victor
    Mohd Tahir, Muhammad Faheem
    Powiązania:
    https://bibliotekanauki.pl/articles/2048744.pdf
    Data publikacji:
    2022
    Wydawca:
    Polska Akademia Nauk. Czytelnia Czasopism PAN
    Tematy:
    geopolymer
    metakaolin
    fiber reinforced concrete
    steel fiber
    mechanical properties
    Opis:
    This study summarised the recent achievement in developing fiber reinforced geopolymer concrete. The factor of replacing Ordinary Portland Cement (OPC) which is due to the emission of carbon dioxide that pollutes the environment globally is well discussed. The introduction towards metakaolin is presented. Besides, the current research trend involved in geopolymer also has been reviewed for the current 20 years to study the interest of researchers over the world by year. Factors that contribute to the frequency of geopolymer research are carried out which are cost, design, and the practicality of the application for geopolymer concrete. Besides, the importance of steel fibers addition to the geopolymer concrete is also well discussed. The fundamental towards metakaolin has been introduced including the source of raw material, which is calcined kaolin, calcined temperature, chemical composition, geopolymerisation process, and other properties. Alkali activators which are mixing solution between sodium hydroxide (NaOH) and sodium silicate (Na2SiO3) have been reviewed. The mechanical properties of fibers reinforced metakaolin-based geopolymer concrete which is compressive and flexural are thoroughly reviewed. The compressive and flexural strength of fiber-reinforced metakaolin geopolymer concrete shows some improvement to the addition of steel fibers. The reviews in this field demonstrate that reinforcement of metakaolin geopolymer concrete by steel fibers shows improvement in mechanical performance.
    Źródło:
    Archives of Metallurgy and Materials; 2022, 67, 1; 261-267
    1733-3490
    Pojawia się w:
    Archives of Metallurgy and Materials
    Dostawca treści:
    Biblioteka Nauki
    Artykuł
    Tytuł:
    Mechanical Effects on Different Solid to Liquid Ratio of Geopolymer Filler in Epoxy Resin
    Autorzy:
    Hashim, Mohammad Firdaus Abu
    Ghazali, Che Mohd Ruzaidi
    Daud, Yusrina Mat
    Faris, Meor Ahmad
    Abdullah, Mohd Mustafa Al Bakri
    Zainal, Farah Farhana
    Hasyim, Saloma
    Lokman, Muhammad Taqiyuddin
    Powiązania:
    https://bibliotekanauki.pl/articles/2048832.pdf
    Data publikacji:
    2022
    Wydawca:
    Polska Akademia Nauk. Czytelnia Czasopism PAN
    Tematy:
    geopolymer filler
    fly ash
    tensile
    flexural
    morphology
    solid-liquid ratio
    Opis:
    Geopolymer is formed from the alkali activation of materials rich in Si and Al content with the addition of a silicate solution to enhance the properties of the materials. This paper presents research on the mechanical properties of fly ash-based geopolymer filler in epoxy resin by varying different solid to liquid ratios using sodium hydroxide and sodium silicate as the alkaline activator. However, the common problem observed from the solid to liquid ratio is the influence of curing time and compressive strength of geopolymer to have the best mechanical property. The mix design for geopolymers of solid to liquid ratio is essential in developing the geopolymer’s mechanical strength. A series of epoxy filled with fly ash-based geopolymer materials with different solid to liquid ratio, which is prepared from 0.5 to 2.5 solid to liquid ratio of alkaline activator. The tensile strength and flexural strength of the epoxy filled with fly ash-based geopolymer materials is determined using Universal Testing Machine under tensile and flexural mode. It was found that the optimum solid to liquid ratio is 2.0, with the optimum tensile and flexural strength value. However, both the tensile and flexural properties of epoxy filled with fly ash-based geopolymer suddenly decrease at a 2.5 solid to liquid ratio. The strength is increasing with the increasing solid to liquid ratio sample of geopolymer filler content.
    Źródło:
    Archives of Metallurgy and Materials; 2022, 67, 1; 215-220
    1733-3490
    Pojawia się w:
    Archives of Metallurgy and Materials
    Dostawca treści:
    Biblioteka Nauki
    Artykuł
      Wyświetlanie 1-3 z 3

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