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    Wyświetlanie 1-7 z 7
    Tytuł:
    Distribution of Mercury in Soil, Water, and Vegetable Fern in a Former Gold Mining Area – Evidence from Nagan Raya Regency, Aceh Province, Indonesia
    Autorzy:
    Nisah, Khairun
    Muslem, Muslem
    Ashari, Tengku Muhammad
    Afkar, Majral
    Iqhrammullah, Muhammad
    Powiązania:
    https://bibliotekanauki.pl/articles/2173338.pdf
    Data publikacji:
    2022
    Wydawca:
    Polskie Towarzystwo Inżynierii Ekologicznej
    Tematy:
    Aceh
    artisanal gold mining
    mercury
    fern
    Pityrogramma calometanos
    Opis:
    The mercury contamination associated with the former intense illegal gold mining activities is suspected in the watershed of Krueng Cot Satu, Nagan Raya Regency, Aceh Province, Indonesia. The aim of this study was to evaluate the mercury contamination residue in the water, soil, and vegetable fern (Pityrogramma calometanos (L)) The samples were collected from locations in the already closed artisanal gold mining sites. The sampling locations were purposively determined by considering their closeness to the previous gold mining activities sites. The content of mercury was analyzed using flow injection for atomic spectroscopy – atomic absorption spectroscopy. The method used was validated by linearity, Limit of Detection (LoD), Limit of Quantification (LoQ), Relative Standard Deviation (RSD), and recovery. The validation test showed that this method is well linear, sensitive, accurate, and precise with a correlation coefficient, LoD, LoQ, RSD and recovery of 0.9999, 0.0477 μg/L, 0.1447 μg/L, 2.96% and 95–105%, respectively. Herein, it was found that the concentrations of mercury contents in the water samples were below the detectable range. However, a high range of mercury concentration of 0.236 – 0.328 μg/g was found in soil, with the highest concentration obtained in the sample collected from the riverbank. The fern sample collected near the riverbank contained mercury in all its parts and concentrated in the root (0.408 μg/g in the leaves, 0.276 μg/g – stalks, and 9.994 μg/g – roots). Meanwhile, the absence of mercury contamination was obtained in the leaves and stalks of the fern samples collected far from the riverbank. The roots, however, were detected with mercury contamination with the highest concentration reaching 27.660 μg/g. Despite its disappearance in the water, mercury contamination residue from the former artisanal gold mining activities still could be traced in the soil and heavy metal accumulating plant – P. calometanos (L).
    Źródło:
    Journal of Ecological Engineering; 2022, 23, 8; 30--39
    2299-8993
    Pojawia się w:
    Journal of Ecological Engineering
    Dostawca treści:
    Biblioteka Nauki
    Artykuł
    Tytuł:
    Impact of land use and land cover changes on carbon stock in Aceh Besar District, Aceh, Indonesia
    Autorzy:
    Achmad, Ashfa
    Ramli, Ichwana
    Nizamuddin, Nizamuddin
    Powiązania:
    https://bibliotekanauki.pl/articles/27312656.pdf
    Data publikacji:
    2023
    Wydawca:
    Instytut Technologiczno-Przyrodniczy
    Tematy:
    Aceh Besar District
    carbon stock
    forest
    land use and land cover
    landscape
    Opis:
    The international community affirms the critical role of forests in climate change mitigation, which includes reducing emissions from degradation and deforestation, carbon stock conservation, sustainable forest management, and increasing carbon stocks in developing countries. It relates to land use and land cover changes. This study aims to review land use and land cover changes (LULC) in two decades, namely 2000-2010 and 2010-2020, and the impact on carbon stocks. Landsat satellite imagery in 2000, 2010, and 2020 are classified into six categories: built-up area, cropland, forest, water body, bareland, and grassland. This classification uses supervised classification. The accuracy kappa coefficient values obtained for the LULC 2000, LULC 2010, and LULC 2020 maps were 89.61%, 83.90%, and 87.10%, respectively. The most dominant systematic LULC change processes were forest degradation in 2000-2020; the transition of forest to cropland (349.20 ha), forest to bareland (171.19 ha), and forest to built-up area (661.68 ha). Loss of using the forest for other uses was followed by a decrease in carbon stock. There was a high decrease in carbon stock in the forest category (11,000 Mg C∙y-1). The results showed a significant change in land use and cover. The decline in the area occurred in the forest category, which decreased from year to year. Meanwhile, the built-up area increases every year. Carbon stocks also decrease from year to year, especially forests as the most significant carbon store, decreasing in the area.
    Źródło:
    Journal of Water and Land Development; 2023, 57; 159--166
    1429-7426
    2083-4535
    Pojawia się w:
    Journal of Water and Land Development
    Dostawca treści:
    Biblioteka Nauki
    Artykuł
    Tytuł:
    Physical Characteristics of Aceh Traditional Salt and Its Potential as Raw Material for Thermal Energy Storage
    Autorzy:
    Gunawati, -
    Humaidi, Syahrul
    Setiawan, Adi
    Sirait, Makmur
    Jalil, Zulkarnain
    Ramadhani, Nadilla
    Makruf, Amar
    Riskina, Shafira
    Irhamni, -
    Powiązania:
    https://bibliotekanauki.pl/articles/2026731.pdf
    Data publikacji:
    2022
    Wydawca:
    Polskie Towarzystwo Inżynierii Ekologicznej
    Tematy:
    aceh salt
    enthalpy
    thermal conductivity
    thermal energy storage
    Opis:
    Thermal energy storage is an important element in order to conserve the energy and optimize the overall efficiency. Development of energy storage system for local purposes requires some information on the raw material which is abundantly available in the local market. This study aimed to investigate the characteristics of traditionally produced salt in Aceh in terms of its potential use as a raw material for thermal energy storage. The sample was collected from the Aceh Besar District and treated by heating at temperatures of 400 °C and 800 °C in a muffle furnace. This treatment is carried out to study the changes in properties and define the best procedure for salt preparation. All samples were characterized under a number of techniques including XRF, XRD, SEM/EDS, TGA/DSC analysis, density, thermal conductivity, and electrolytic conductivity. The XRF characterization showed that the local Aceh salt was graded as a category III salt. Furthermore, according to the TGA/DSC characterization, the melting temperature is close to 800 °C, and the enthalpy value is close to 492 kJ/kg. It is ample evidence that the Aceh salt can be used as a thermal energy storage material. Furthermore, increasing the temperature of local salt’s heat treatment contributes to increasing the enthalpy value, crystal size, density, thermal conductivity, and electrolyte conductivity.
    Źródło:
    Journal of Ecological Engineering; 2022, 23, 2; 116-122
    2299-8993
    Pojawia się w:
    Journal of Ecological Engineering
    Dostawca treści:
    Biblioteka Nauki
    Artykuł
    Tytuł:
    Szariat a prawa człowieka w Acehu
    Sharia law and human rigts in Aceh
    Autorzy:
    Bielawski, Kornel
    Powiązania:
    https://bibliotekanauki.pl/articles/11236646.pdf
    Data publikacji:
    2015-12-31
    Wydawca:
    Wydawnictwo Adam Marszałek
    Tematy:
    szariat
    Aceh
    prawa człowieka
    Shariah
    human rights
    Opis:
    The Indonesian province of Aceh is considered to be the „gateway to Mecca”, as first Arab traders arrived there and in a peaceful way convinced Acehnese to adopt Islam as their religion. Many years of civil war and social consequences of tsunami in December 2004 meant that Aceh began to radicalize religiously. Implemented in the early twenty-first century Shariah law initially appeared to be tolerant, liberal version of Islam, but after 2004 it turned out to be completely different. Non-governmental organizations have begun to alarm about increasing cases of human rights violations in Aceh, as a direct consequence of the introduction of Shariah.
    Źródło:
    Cywilizacja i Polityka; 2015, 13; 210-218
    1732-5641
    Pojawia się w:
    Cywilizacja i Polityka
    Dostawca treści:
    Biblioteka Nauki
    Artykuł
      Wyświetlanie 1-7 z 7

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