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    Wyświetlanie 1-4 z 4
    Tytuł:
    Mössbauer spectroscopy study of 60P2O5-40Fe2O3 glass crystallization
    Autorzy:
    Stoch, P.
    Stoch, A.
    Powiązania:
    https://bibliotekanauki.pl/articles/146169.pdf
    Data publikacji:
    2015
    Wydawca:
    Instytut Chemii i Techniki Jądrowej
    Tematy:
    crystallization
    iron phosphate glass
    Mössbauer spectroscopy
    nuclear waste
    waste glass
    Opis:
    60P2O5-40Fe2O3 glass was synthesized and 57Fe Mössbauer spectroscopy study was presented. The main goal of the research was to investigate structural changes of local environment of iron ions during gradual crystallization of the glass. It was observed that some changes were evidenced at temperature of heat treatment higher than 400°C, above which content of tetrahedrally coordinated Fe3+ was increased in cost of octahedral sites. This led to formation of areas of nucleation of α-FePO4. Crystallization of α-Fe3(P2O7)2 and Fe2P2O7 was also observed.
    Źródło:
    Nukleonika; 2015, 60, 1; 133-136
    0029-5922
    1508-5791
    Pojawia się w:
    Nukleonika
    Dostawca treści:
    Biblioteka Nauki
    Artykuł
    Tytuł:
    Mössbauer spectroscopy study of 60P2O5-40Fe2O3 glass
    Autorzy:
    Stoch, P.
    Ciecińska, M.
    Zachariasz, P.
    Suwalski, J.
    Górski, L.
    Wójcik, T.
    Powiązania:
    https://bibliotekanauki.pl/articles/147350.pdf
    Data publikacji:
    2013
    Wydawca:
    Instytut Chemii i Techniki Jądrowej
    Tematy:
    iron phosphate glass
    Mössbauer spectroscopy
    nuclear waste
    waste glass
    Opis:
    A 57Fe Mössbauer spectroscopy study is presented. The main goal of the research was to investigate the structural information of the glass-like the coordination numbers and redox ratio of the iron. Most of the iron, about 80%, is present in the glass as Fe3+, which is composed of tetrahedral (57%) and octahedral (23%) coordinated iron. The rest of the iron, about 20%, is in the oxidation state Fe2+. This iron could be mostly present as VIFe2+, but five-fold coordinated iron is also possible. Finally, the structural model of the synthesized 60P2O5-40Fe2O3 glass was proposed.
    Źródło:
    Nukleonika; 2013, 58, 1; 63-66
    0029-5922
    1508-5791
    Pojawia się w:
    Nukleonika
    Dostawca treści:
    Biblioteka Nauki
    Artykuł
    Tytuł:
    Finite element method based simulation of electrical breakage of iron-phosphate ore
    Autorzy:
    Razavian, S. M.
    Rezai, B.
    Irannajad, M.
    Powiązania:
    https://bibliotekanauki.pl/articles/110295.pdf
    Data publikacji:
    2015
    Wydawca:
    Politechnika Wrocławska. Oficyna Wydawnicza Politechniki Wrocławskiej
    Tematy:
    finite element method
    numerical simulation
    electrical breakage
    iron-phosphate ore
    COMSOL Multiphysics
    Opis:
    In this study, the effect of minerals composition, particle size and shape as well as electrodes distance from iron-phosphate ore samples, was investigated by using a commercial software. Comparison between high voltage pulses and conventional crushing showed that minerals of interest in the electrical comminution product are better liberated than in the conventional comminution. In order to elucidate and confirm the experimental results, numerical simulation of electrical field distributions/intensity were performed. The software uses the finite element method, a numerical technique for calculating approximate solutions of partial differential equations with known boundary conditions. Magnetite, apatite and quartz were the basic minerals of iron-phosphate ore components, and the main material property used in the simulations was electrical permittivity. The results showed that the induced electrical field was strongly dependent on the electrical properties of minerals, the feed particle size and the location of the magnetite mineral (due to higher permittivity) in the ore. The angle of particle contact surface with high voltage electrode was an important factor in the intensity of electrical field. Smaller contact angle resulted in higher intensity of the electrical field. Electrical discharge within the material was converted to electrohydraulic discharge within the surrounding water environment by increasing the distance between the high voltage electrode and the material contact surface.
    Źródło:
    Physicochemical Problems of Mineral Processing; 2015, 51, 1; 137-150
    1643-1049
    2084-4735
    Pojawia się w:
    Physicochemical Problems of Mineral Processing
    Dostawca treści:
    Biblioteka Nauki
    Artykuł
    Tytuł:
    Evaluation of the effectiveness of iron phosphate and the parasitic nematode Phasmarhabditis hermaphrodita in reducing plant damage caused by the slug Arion vulgaris Moquin-Tandon, 1885
    Autorzy:
    Kozlowski, J.
    Jaskulska, M.
    Kozlowska, M.
    Powiązania:
    https://bibliotekanauki.pl/articles/84014.pdf
    Data publikacji:
    2014
    Wydawca:
    Uniwersytet Mikołaja Kopernika. Wydział Biologii i Ochrony Środowiska. Stowarzyszenie Malakologów Polskich
    Tematy:
    effectiveness
    iron phosphate
    nematode
    parasitic nematode
    Phasmarhabditis hermaphrodita
    plant damage
    slug
    Arion vulgaris
    pest control
    Opis:
    Arion vulgaris is one of the most important slug pests of crop plants, and is extremely hard to control. We assessed the effectiveness of a slug pellets containing iron phosphate, compared with methiocarb- and metaldehyde-based molluscicides, and of the parasitic nematode P. hermaphrodita contained in the commercial bioproduct Nemaslug. The effect of various doses of these substances and the nematode in reducing slug damage to Chinese cabbage plants was evaluated in laboratory experiments. A reduction in slug numbers and plant damage was obtained following application of the molluscicides, and a reduction in plant damage following application of P. hermaphrodita (immersion of plant roots in the nematode-containing liquid). The results are of great practical significance, because they show that it is possible to reduce the recommended dose of iron phosphate (5 g/m2) by one half. Another important finding is that application of the nematode in the form of root immersion is more effective than spraying. The study demonstrates the usefulness of the nematode and of the iron phosphate molluscicide in protecting plants from A. vulgaris; this is of particular importance for crops on which the application of traditional molluscicides is not possible.
    Źródło:
    Folia Malacologica; 2014, 22, 4
    1506-7629
    Pojawia się w:
    Folia Malacologica
    Dostawca treści:
    Biblioteka Nauki
    Artykuł
      Wyświetlanie 1-4 z 4

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