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Wyszukujesz frazę "induced crystallization" wg kryterium: Wszystkie pola

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    Wyświetlanie 1-5 z 5
    Tytuł:
    Various intensity of Proteus mirabilis-induced crystallization resulting from the changes in the mineral composition of urine
    Autorzy:
    Torzewska, Agnieszka
    Różalski, Antoni
    Powiązania:
    https://bibliotekanauki.pl/articles/1039148.pdf
    Data publikacji:
    2015
    Wydawca:
    Polskie Towarzystwo Biochemiczne
    Tematy:
    Proteus mirabilis
    crystallization
    urinary stones
    mineral composition
    Opis:
    Infectious urolithiasis is a result of recurrent and chronic urinary tract infections caused by urease-positive bacteria, especially Proteus mirabilis. The main role in the development of this kind of stones is played by bacterial factors such as urease and extracellular polysaccharides, but urinary tract environment also contributes to this process. We used an in vitro model to establish how the changes in the basic minerals concentrations affect the intensity of crystallization which occurs in urine. In each experiment crystallization was induced by an addition of P. mirabilis to artificial urine with a precisely defined chemical composition. Crystallization intensity was determined using the spectrophotometric microdilution method and the chemical composition of formed crystals was established by atomic absorption spectroscopy and colorimetric methods. Increasing the concentration of all crystals forming ions such as Mg2+, Ca2+ and phosphate strongly intensified the process of crystallization, whereas reducing the amount of these components below the proper physiological concentration did not affect its intensity. The inhibitory influence of citrate on calcium and magnesium phosphate crystallization and competitive actions of calcium and oxalate ions on struvite crystals formation were not confirmed. In the case of infectious stones the chemical composition of urine plays an important role, which creates a necessity to support the treatment by developing a model of proper diet.
    Źródło:
    Acta Biochimica Polonica; 2015, 62, 1; 127-132
    0001-527X
    Pojawia się w:
    Acta Biochimica Polonica
    Dostawca treści:
    Biblioteka Nauki
    Artykuł
    Tytuł:
    Thermal Stability and Mechanism of Thermally Induced Crystallization of $Fe_{73.5}Cu_1Nb_3Si_{15.5}B_7$ Amorphous Alloy
    Autorzy:
    Vasić, M.
    Minić, D.
    Blagojević, V.
    Žák, T.
    Pizúrová, N.
    David, B.
    Powiązania:
    https://bibliotekanauki.pl/articles/1402117.pdf
    Data publikacji:
    2015-10
    Wydawca:
    Polska Akademia Nauk. Instytut Fizyki PAN
    Tematy:
    64.70.dg
    64.70.kd
    64.70.pe
    Opis:
    Investigation of thermal stability of the alloy revealed stepwise crystallization process, manifested by two distinct complex exothermic peaks in differential scanning calorimetry curves. Kinetic parameters of individual crystallization steps were found using the Kissinger and Vyazovkin methods. Structural characterization of thermally treated samples showed formation of different iron-based phases including α-Fe(Si), Fe₂B, Fe₁₆Nb₆Si₇ and Fe₂Si and some metastable intermediary species. Morphology characterization of the surface and cross-section of the thermally treated samples showed granulated structure composed of several different phases and indicated occurrence of impingement effects during crystal growth. Value of estimated lifetime suggested very high stability against crystallization at room temperature and abrupt decrease of lifetime with temperature increase.
    Źródło:
    Acta Physica Polonica A; 2015, 128, 4; 657-660
    0587-4246
    1898-794X
    Pojawia się w:
    Acta Physica Polonica A
    Dostawca treści:
    Biblioteka Nauki
    Artykuł
    Tytuł:
    Optimization of induced crystallization reaction in a novel process of nutrients removal coupled with phosphorus recovery from domestic wastewater
    Autorzy:
    Zou, H.
    Wang, Y.
    Powiązania:
    https://bibliotekanauki.pl/articles/205404.pdf
    Data publikacji:
    2017
    Wydawca:
    Polska Akademia Nauk. Czytelnia Czasopism PAN
    Tematy:
    phosphorus recovery
    induced crystallization
    IC
    hydroxyapatite
    HAP
    domestic wastewater
    enhanced biological phosphorus removal
    EBPR
    Opis:
    Phosphorus removal and recovery from domestic wastewater is urgent nowadays. A novel process of nutrients removal coupled with phosphorus recovery from domestic sewage was proposed and optimization of induced crystallization reaction was performed in this study. The results showed that 92.3% of phosphorus recovery via induced Hydroxyapatite crystallization was achieved at the optimum process parameters: reaction time of 80 min, seed crystal loads of 60 g/L, pH of 8.5, Ca/P mole ratio of 2.0 and 4.0 L/min aeration rate when the PO43-P concentration was 10 mg/L in the influent, displaying an excellent phosphorus recovery performance. Importantly, it was found that the effect of reaction temperature on induced Hydroxyapatite crystallization was slight, thus favoring practical application of phosphorus recovery method described in this study. From these results, the proposed method of induced HAP crystallization to recover phosphorus combined with nutrients removal can be an economical and effective technology, probably favoring the water pollution control and phosphate rock recycle.
    Źródło:
    Archives of Environmental Protection; 2017, 43, 4; 33-38
    2083-4772
    2083-4810
    Pojawia się w:
    Archives of Environmental Protection
    Dostawca treści:
    Biblioteka Nauki
    Artykuł
    Tytuł:
    Implanted manganese redistribution in Si after He+ irradiation and hydrogen pulse plasma treatment
    Autorzy:
    Werner, Z.
    Pochrybniak, C.
    Barlak, M.
    Piekoszewski, J.
    Korman, A.
    Heller, R.
    Szymczyk, W.
    Bocheńska, K.
    Powiązania:
    https://bibliotekanauki.pl/articles/147018.pdf
    Data publikacji:
    2011
    Wydawca:
    Instytut Chemii i Techniki Jądrowej
    Tematy:
    dilute magnetic semiconductors (DMS)
    Mn-implanted Si
    ion beam induced epitaxial crystallization
    Opis:
    Si-Mn alloy with a Mn content of a few percent is potentially a candidate for room temperature (RT) dilute magnetic semiconductor (DMS). However, the present methods of material manufacture suffer from problems with poor Mn solubility and thermodynamical limitations. We study a non-equilibrium method in which silicon is first implanted with 160 keV manganese ions to a dose of 1 × 1016 ions/cm2 and next either irradiated with 1.5 MeV 4He+ ions from the Warsaw Van de Graaff accelerator at 400°C or treated with high-energy hydrogen plasma pulses. Conclusion from Rutherford backscattering spectrometry (RBS) examination of the samples is that both approaches lead to recovery of crystalline surface layer with manganese occupying off-substitutional sites. The potential development of the method is discussed.
    Źródło:
    Nukleonika; 2011, 56, 1; 5-8
    0029-5922
    1508-5791
    Pojawia się w:
    Nukleonika
    Dostawca treści:
    Biblioteka Nauki
    Artykuł
    Tytuł:
    Crystallization of FeSiB Amorphous Ribbons Induced by Laser Interference Irradiation
    Autorzy:
    Kusinski, J.
    Czyż, O.
    Radziszewska, A.
    Morgiel, J.
    Ostrowski, R.
    Strzelec, M.
    Czyż, K.
    Rycyk, A.
    Powiązania:
    https://bibliotekanauki.pl/articles/379811.pdf
    Data publikacji:
    2018
    Wydawca:
    Polska Akademia Nauk. Czytelnia Czasopism PAN
    Tematy:
    laser interference heating
    FeSiB alloy
    amorphous alloy
    scanning electron microscopy
    transmission electron microscopy
    stop FeSiB
    stop amorficzny
    skaningowa mikroskopia elektronowa
    transmisyjna mikroskopia elektronowa
    Opis:
    Detailed studies on the effects of pulsed laser interference heating on surface characteristics and subsurface microstructure of amorphous Fe80Si11B9 alloy are reported. Laser interference heating, with relatively low pulsed laser energy (90 and 120 mJ), but with a variable number (from 50-500) of consecutive laser pulses permitted to get energy accumulation in heated areas. Such treatment allowed to form two- Dimensional micro-islands of laser-affected material periodically distributed in amorphous matrix. The crystallization process of amorphous FeSiB ribbons was studied by means of scanning and transmission electron microscopy. Detailed microstructural examination showed that the use of laser beam, resulted in development of nanostructure in the heated areas of the amorphous ribbon. The generation of nanocrystalline seed islands created by pulsed laser interference was observed. This key result may evidently give new knowledge concerning the differences in microstructure formed during the conventional and lased induced crystallization the amorphous alloys. Further experiments are needed to clarify the effect of pulsed laser interference crystallization on magnetic properties of these alloys.
    Źródło:
    Archives of Foundry Engineering; 2018, 18, 2; 27-30
    1897-3310
    2299-2944
    Pojawia się w:
    Archives of Foundry Engineering
    Dostawca treści:
    Biblioteka Nauki
    Artykuł
      Wyświetlanie 1-5 z 5

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