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    Wyświetlanie 1-4 z 4
    Tytuł:
    Constraints of the MAX4781 CMOS Solution for Electrode Switching in Multilayer Electrochemical Probes
    Autorzy:
    Cimpoiasu, V.M.
    Radulescu, F.
    Nealson, K.H.
    Moga, Ioana Corina
    Popa, R.
    Powiązania:
    https://bibliotekanauki.pl/articles/2106598.pdf
    Data publikacji:
    2022
    Wydawca:
    Polska Akademia Nauk. Czytelnia Czasopism PAN
    Tematy:
    sensor
    SPEAR
    multielectrode
    redox interface
    sediments
    electrochemical gradients
    Opis:
    The most common means to analyze redox gradients in sediments is by push/pulling electrochemical probes through sediment’ strata while repeating measurements. Yet, as electrodes move up and down they disrupt the texture of the sediment layers thus biasing subsequent measurements. This makes it difficult to obtain reproducible measurements or to study the evolution of electrochemical gradients. One solution for solving this problem is to eliminate actuators and electrode movements altogether, while instead deploying probes with numerous electrodes positioned at various depths in the sediment. This mode of operation requires electrode switching. We discuss an electrode-switching solution for multi-electrode probes, based on Complementary Metal-Oxide-Semiconductor (CMOS) multiplexors. In this solution, electrodes can be individually activated in any order, sequence or time frame through digital software commands. We discuss constraints of CMOS-based multilayer electrochemical probes during cyclic voltammetry.
    Źródło:
    Archives of Metallurgy and Materials; 2022, 67, 2; 691--694
    1733-3490
    Pojawia się w:
    Archives of Metallurgy and Materials
    Dostawca treści:
    Biblioteka Nauki
    Artykuł
    Tytuł:
    Bioaccumulation of uranium from waste water using different strains of Saccharomyces cerevisiae
    Autorzy:
    Tykva, R.
    Novák, J.
    Podracká, E.
    Popa, K.
    Powiązania:
    https://bibliotekanauki.pl/articles/148088.pdf
    Data publikacji:
    2009
    Wydawca:
    Instytut Chemii i Techniki Jądrowej
    Tematy:
    bioaccumulation
    uranium
    Saccharomyces cerevisiae
    competitive ions
    Opis:
    Five different strains of Saccharomyces cerevisiae were tested for their abilities to accumulate uranium from waste water containing competitive ions. Samples of water passing out from a previous uranium mill were used. The strains tested possess different abilities to accumulate uranium. The kinetics of bioaccumulation, the leaching degree, the influence of cell density and their origin were investigated. Under the applied experimental conditions, more than a half of the total activity (uranium and the decay products) could be accumulated after 60 min contact time of 1 mL S. cerevisiae suspension and 5 mL of water. The other cations present in solution effectively competed for the uranium accumulation. 226Ra and its decay products were completely retained using all tested strains.
    Źródło:
    Nukleonika; 2009, 54, 2; 143-148
    0029-5922
    1508-5791
    Pojawia się w:
    Nukleonika
    Dostawca treści:
    Biblioteka Nauki
    Artykuł
    Tytuł:
    Height-diameter models for mixed-species forests consisting of spruce, fir, and beech
    Autorzy:
    Petras, R.
    Bosela, M.
    Mecko, J.
    Oszlanyi, J.
    Popa, I.
    Powiązania:
    https://bibliotekanauki.pl/articles/38691.pdf
    Data publikacji:
    2014
    Wydawca:
    Instytut Badawczy Leśnictwa
    Tematy:
    height-diameter model
    mixed-species forest
    tree
    spruce
    fir
    beech
    Abies alba
    Picea abies
    Fagus sylvatica
    Opis:
    Height-diameter models define the general relationship between the tree height and diameter at each growth stage of the forest stand. This paper presents generalized height-diameter models for mixed-species forest stands consisting of Norway spruce (Picea abies Karst.), Silver fir (Abies alba L.), and European beech (Fagus sylvatica L.) from Slovakia. The models were derived using two growth functions from the exponential family: the two-parameter Michailoff and three-parameter Korf functions. Generalized height-diameter functions must normally be constrained to pass through the mean stand diameter and height, and then the final growth model has only one or two parameters to be estimated. These “free” parameters are then expressed over the quadratic mean diameter, height and stand age and the final mathematical form of the model is obtained. The study material included 50 long-term experimental plots located in the Western Carpathians. The plots were established 40–50 years ago and have been repeatedly measured at 5 to 10-year intervals. The dataset includes 7,950 height measurements of spruce, 21,661 of fir and 5,794 of beech. As many as 9 regression models were derived for each species. Although the “goodness of fit” of all models showed that they were generally well suited for the data, the best results were obtained for silver fir. The coefficient of determination ranged from 0.946 to 0.948, RMSE (m) was in the interval 1.94–1.97 and the bias (m) was –0.031 to 0.063. Although slightly imprecise parameter estimation was established for spruce, the estimations of the regression parameters obtained for beech were quite less precise. The coefficient of determination for beech was 0.854–0.860, RMSE (m) 2.67–2.72, and the bias (m) ranged from –0.144 to –0.056. The majority of models using Korf’s formula produced slightly better estimations than Michailoff’s, and it proved immaterial which estimated parameter was fixed and which parameters were free.
    Źródło:
    Folia Forestalia Polonica. Series A . Forestry; 2014, 56, 2
    0071-6677
    Pojawia się w:
    Folia Forestalia Polonica. Series A . Forestry
    Dostawca treści:
    Biblioteka Nauki
    Artykuł
    Tytuł:
    Measurements of plasma diffusion coefficient in Pilot-PSI device using Katsumata probe
    Autorzy:
    Solomon, M. L.
    Mihaila, I.
    Anita, V.
    Costin, C.
    Popa, G.
    van der Meiden, H.
    Al, R.
    van Rooij, G.
    Cardozo, N. L.
    Rapp, J.
    Ionita, C.
    Stärz, R.
    Schrittwieser, R.
    Powiązania:
    https://bibliotekanauki.pl/articles/385269.pdf
    Data publikacji:
    2009
    Wydawca:
    Sieć Badawcza Łukasiewicz - Przemysłowy Instytut Automatyki i Pomiarów
    Tematy:
    Katsumata probe
    magnetized plasma
    diffusion coefficient
    Opis:
    Cross-field transport of particles and energy is a major issue in magnetized fusion-relevant plasmas, due to its relevance for plasma confinement. In this paper Katsumata probe measurements performed in Pilot-PSI linear magnetized plasma device are presented. The plasma diffusion coefficient in perpendicular direction to the magnetic field was estimated from the measurements.
    Źródło:
    Journal of Automation Mobile Robotics and Intelligent Systems; 2009, 3, 4; 160-162
    1897-8649
    2080-2145
    Pojawia się w:
    Journal of Automation Mobile Robotics and Intelligent Systems
    Dostawca treści:
    Biblioteka Nauki
    Artykuł
      Wyświetlanie 1-4 z 4

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