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    Wyświetlanie 1-4 z 4
    Tytuł:
    Investigations of HaH 286 eucrite by analytical electron microscopy
    Autorzy:
    Szurgot, M.
    Polański, K.
    Powiązania:
    https://bibliotekanauki.pl/articles/411480.pdf
    Data publikacji:
    2011
    Wydawca:
    Polskie Towarzystwo Meteorytowe
    Tematy:
    Eucrite
    Hammadah al Hamra 286
    analytical electron microscopy
    meteorite
    Opis:
    The elemental composition, mineral composition and microstructure of the HaH 286 eucrite found in Lybia in 2000 were studied by analytical electron microscopy. It was established that the mean elemental composition of HaH 286 and atomic and molar ratios: Fe/Mn = 34, Mg/Mg+Fe = 36, Na/Al = 0.066, and Ca/Al = 0.73 are typical of eucrites, and two main meteorite minerals have the mean composition: clinopyroxene En34Fs59Wo7 and plagioclase feldspar An88Ab12. Variations in the composition of pyroxenes and plagioclases are as follows: pyroxene En34-36Fs53-62Wo3-13 and plagioclase: An86-100Ab14-0. Pyroxene is represented by pigeonite and by orthopyroxene. Chromite, ilmenite and silica are minor minerals. The composition, atomic ratios and microstructure indicate that the HaH 286 meteorite is a pyroxene-plagioclase basaltic achondrite, a non-cumulate eucrite with the composition of plagioclase changing between anorthite and bytownite.
    Źródło:
    Meteorites; 2011, 1, 1; 29-38
    2299-0313
    2299-1220
    Pojawia się w:
    Meteorites
    Dostawca treści:
    Biblioteka Nauki
    Artykuł
    Tytuł:
    The nature of the Pleistocene-Holocene palaeosols in the Gaza Strip, Palestine
    Autorzy:
    Ubeid, Khalid F.
    Powiązania:
    https://bibliotekanauki.pl/articles/94360.pdf
    Data publikacji:
    2011
    Wydawca:
    Uniwersytet im. Adama Mickiewicza w Poznaniu
    Tematy:
    hamra
    palaeosols
    palaeoclimate
    Quaternary
    Gaza
    gleby kopalne
    paleoklimat
    czwartorzęd
    Opis:
    The Pleistocene to Holocene succession in the Gaza Strip, Palestine, consists of an alternation of calcareous sandstones and reddish fine-grained deposits (palaeosols). The palaeosols can be subdivided into two main groups based on the sand-sized versus clay- to silt-sized grains: (1) the sandy hamra palaeosols, and (2) the loess and loess-derived palaeosols. The hamra palaeosols can, in turn, also be subdivided into two main types according to their colour and grain size: (1) light brown loamy to sandy hamra palaeosols, and (2) dark brown sandy clay hamra palaeosols. The hamra palaeosols are polygenetic and originated in humid environments. Their red colour results from ferric oxides coating the sand grains, but also by illuviation. The various pedogenitic units and their gradual transition to loess palaeosols are due to different phases of dust accretion. Both groups of palaeosols developed during the last glacial. They are considered to represent different climate environments: hamra palaeosols represent humid climates, whereas the loess and loess-derived palaeosols represent dry and semi-dry climates.
    Źródło:
    Geologos; 2011, 17, 3; 163-173
    1426-8981
    2080-6574
    Pojawia się w:
    Geologos
    Dostawca treści:
    Biblioteka Nauki
    Artykuł
    Tytuł:
    Assessment of the Hauterivian groundwater quality in zinc mining area for drinking and irrigation uses: Case of Chaabet el Hamra, Algeria
    Autorzy:
    Kada, Houria
    Demdoum, Abdslem
    Powiązania:
    https://bibliotekanauki.pl/articles/293324.pdf
    Data publikacji:
    2020
    Wydawca:
    Instytut Technologiczno-Przyrodniczy
    Tematy:
    Chaabet el Hamra
    drinking water
    Hauterivian groundwater
    irrigation
    quality
    Setif
    Opis:
    In order to evaluate the water quality of the Hauterivian groundwater in the zinc deposit of Chaabet el Hamra, Southern Setif region, Algeria, eighteen physico-chemical parameters such as pH, EC, TDS, Cl−, SO42−, HCO3−, CO32−, NO3−, Ca2+, Mg2+, Na+, K+,, and heavy metals Zn, Pb, Fe, Cr, Cd, Mn were analyzed and collected from six different wells in April 2012. The studied groundwater is dominated by HCO3−, Ca2+, and Mg2+ ions. According to the World Health Organization (WHO) and Algerian standards, all groundwater samples are considered safe and fit for drinking as they fall within the permissible limits. In addition, the Schoeller diagram confirms the best quality water of the Hauterivian groundwater. Gibbs diagram show that the predominant samples fall in the rock-water interaction field, suggesting that water-rock interactions are the major mechanism controlling groundwater chemistry. Assessment of groundwater samples using various water quality indices such as sodium absorption ratio (SAR), soluble sodium percentage (SSP), residual sodium carbonate (RSC), magnesium hazard (MH) and Kelly ratio (KR) showed that the groundwater in the area has an excellent quality for irrigation purpose. According to Wilcox’s diagram, all groundwater samples fall in the C2S1 category, reflecting that they are suitable for irrigation.
    Źródło:
    Journal of Water and Land Development; 2020, 46; 131-139
    1429-7426
    2083-4535
    Pojawia się w:
    Journal of Water and Land Development
    Dostawca treści:
    Biblioteka Nauki
    Artykuł
    Tytuł:
    Animal remains from the el-Hamra Christian complex in the el-Gaab Depression, West Dongola (Sudan)
    Autorzy:
    Hamdeen, Hamad Mohamed
    Fadl Tahir, Yahia
    Powiązania:
    https://bibliotekanauki.pl/articles/1634189.pdf
    Data publikacji:
    2019-12-31
    Wydawca:
    Uniwersytet Warszawski. Wydawnictwa Uniwersytetu Warszawskiego
    Tematy:
    archaeozoology in Nubia
    el-Ga'ab Depression
    sheep/goat
    el-Hamra
    Opis:
    The animal remains discussed in this paper come from three archaeological sites in the el Hamra Christian complex excavated within the frame of the el Ga'ab Depression archaeological, ethnographical and ecological project. During two seasons in 2013/2014 and 2014/2015, a team directed by Yahia Fadl Tahir collected and examined a total of 89 mammals, 5 ostrich egg and 16 Mollusca remains. The bone assemblage was divided into seven groups representing the most and least attractive parts of the carcass in terms of nutritional value. Identified species include sheep (Ovis aries) and goat (Capra hircus), while other animal remains include ostrich egg fragments, and mollusk species: Pila ovata, Melanoides tuberculata and Lanistes carinatus. Similarities can be observed in livestock husbandry and subsistence patterns in the early Christian period in the Dongola region, where the economy depended on smalls mammals like sheep and goats to provide milk and meat.
    Źródło:
    Polish Archaeology in the Mediterranean; 2019, 28(2); 455-464
    1234-5415
    Pojawia się w:
    Polish Archaeology in the Mediterranean
    Dostawca treści:
    Biblioteka Nauki
    Artykuł
      Wyświetlanie 1-4 z 4

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