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    Wyświetlanie 1-5 z 5
    Tytuł:
    Monitoring the Evolution of Redox Changes in Sediments made Possible by Electrochemical Multilayer Probes
    Autorzy:
    Popa, Radu
    Moga, Ioana Corina
    Nealson, Kenneth H.
    Cimpoiasu, V.M.
    Powiązania:
    https://bibliotekanauki.pl/articles/2134093.pdf
    Data publikacji:
    2022
    Wydawca:
    Polska Akademia Nauk. Czytelnia Czasopism PAN
    Tematy:
    sensor
    sediments
    SPEAR
    multielectrode
    redox interface
    Opis:
    Marine sediments with rapid oxic/anoxic transitions are difficult to monitor in real time. Organic overload that may lead to anoxia and buildup of hydrogen sulfide can be caused by a variety of factors such as sewage spills, harbor water stagnation, algal blooms and the vicinity of aquaculture operations. We have tested a novel multiprobe technology (named SPEAR) on marine sediments to evaluate its performance in monitoring sediments and overlaying water. Our results show the ability of the SPEAR probes to distinguish electrochemical changes at 2-3 mm scale and at hourly cycles. SPEAR probes have the ability to identify redox interfaces and redox transition zones in sediments, but do not use micromanipulators (which are cumbersome in field and underwater applications). We propose that the best target habitats for SPEAR-type monitoring are rapidly evolving muddy deposits and sediments near aquaculture operations where pollution with organics stresses the ecosystem.
    Źródło:
    Archives of Metallurgy and Materials; 2022, 67, 3; 1037--1041
    1733-3490
    Pojawia się w:
    Archives of Metallurgy and Materials
    Dostawca treści:
    Biblioteka Nauki
    Artykuł
    Tytuł:
    Yielding of white and green asparagus in the open field and in the tunnel in the first two years of harvest
    Plonowanie zielonych i bielonych wypustek szparaga uprawianego w polu i w tunelu foliowym w pierwszych dwóch latach zbioru
    Autorzy:
    Dyduch, J.
    Mysiak, B.
    Rodkiewicz, T.
    Powiązania:
    https://bibliotekanauki.pl/articles/11542970.pdf
    Data publikacji:
    2014
    Wydawca:
    Uniwersytet Przyrodniczy w Lublinie. Wydawnictwo Uniwersytetu Przyrodniczego w Lublinie
    Tematy:
    yielding
    white asparagus
    Asparagus officinalis
    green asparagus
    asparagus
    white spear
    green spear
    weight
    open field
    tunnel
    foil
    harvest
    Opis:
    Asparagus (Asparagus officinalis L.) may be cultivated either for white or for green spears, the latter method started to prevail in the world in the last years. The aim of the study was a comparison of yielding of white and green asparagus cv. ‘Ravel’ in the open field and in the PE tunnel. The weight, number and diameter of spears in the total, marketable and non-marketable yields in the first and second harvest year were assessed. Total and marketable yield of white asparagus was higher than that of green one, but the latter formed significantly more spears in the total and nonmarketable yield. The yield and number of spears obtained in the tunnel was significantly higher than with no cover. Marketable spears constituted on average 77.8% of yield weight and 63.0% of the total number of spears and the values for both cultivation methods were similar. Mean weight and diameter of white spears were higher than those of the green ones.
    Szparag (Asparagus officinalis L.) może być uprawiany na wypustki bielone lub zielone; w ostatnich latach na świecie zaczął dominować ten drugi sposób uprawy. Celem badań było porównanie plonowania szparaga lekarskiego odmiany Ravel w uprawie na bielone i zielone wypustki w gruncie i w tunelu foliowym. Oceniono masę, liczbę i średnicę wypustek w plonie ogółem, handlowym i niehandlowym w pierwszym i drugim roku zbioru. Plon ogółem i handlowy bielonych wypustek był istotnie wyższy niż zielonych, natomiast liczba zielonych wypustek w plonie ogółem i niehandlowym była większa w porównaniu z bielonymi. Plon i liczba wypustek z uprawy w tunelu były istotnie większe niż w gruncie. Wypustki handlowe stanowiły średnio 77,8% masy i 63,0% liczby wypustek i wartości te były zbliżone dla obu metod uprawy. Wypustki bielone miały średnio większą masę i średnicę niż zielone.
    Źródło:
    Acta Scientiarum Polonorum. Hortorum Cultus; 2014, 13, 4; 107-115
    1644-0692
    Pojawia się w:
    Acta Scientiarum Polonorum. Hortorum Cultus
    Dostawca treści:
    Biblioteka Nauki
    Artykuł
    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:
    A finite element model development as a part of process of energy absorption material selection
    Autorzy:
    Jakubowski, R.
    Skorupka, Z.
    Powiązania:
    https://bibliotekanauki.pl/articles/244612.pdf
    Data publikacji:
    2016
    Wydawca:
    Instytut Techniczny Wojsk Lotniczych
    Tematy:
    RASTAS Spear
    material
    energy absorption
    finite element model
    LS-DYNA
    Opis:
    The Warsaw Institute of Aviation major role in the RASTAS Spear project was to design an energy absorption system for the space probe lander. As the system was meant to be unmanned, the main requirement was to use no active solutions like parachute or rocket propulsion (less complexity in application and thus more reliability). A group of various materials was chosen to be tested. Tests campaign was divided into three stages: static compression tests, low speed dynamic tests and high speed dynamic tests. The high-speed dynamic tests were divided into two substages. In the first one simple cube specimens were tested to obtain data necessary for second substage in which full-scale object was tested. Having valuable data from experiments, numerical simulations in LS-DYNA software were carried out and then the results were compared. Based on experimental data several iterations during finite element model developing process were made. That process allowed setting up properly simulation by changing and adjusting properties such: material models, contact types, element formulation and other important constants. The finite element simulation results showed a good correlation with experimental data. The knowledge gained from numerical model optimization in connection with experimental data allowed for creating faster and more accurate energy absorbing material selection methodology. This methodology was successfully used in subsequent projects in which Institute of Aviation took part and also can be used in other future applications.
    Źródło:
    Journal of KONES; 2016, 23, 3; 217-223
    1231-4005
    2354-0133
    Pojawia się w:
    Journal of KONES
    Dostawca treści:
    Biblioteka Nauki
    Artykuł
    Tytuł:
    Phenolic acids in extracts obtained from the flowering herbs of Cirsium vulgare (Savi) Ten. growing in Poland
    Autorzy:
    Kozyra, M.
    Glowniak, K.
    Powiązania:
    https://bibliotekanauki.pl/articles/58350.pdf
    Data publikacji:
    2013
    Wydawca:
    Polskie Towarzystwo Botaniczne
    Tematy:
    phenolic acid
    methanol extract
    flowering plant
    herb
    Cirsium vulgare
    spear thistle
    Polska
    Opis:
    In this work the phenolic acids in the methanol extract from the flowering herbs of Cirsium vulgare (Savi) Ten. growing in Poland were isolated and identified. The samples containing free phenolic acids and those released after acid and alkaline hydrolyses were investigated by 2D TLC on cellulose. After purification by SPE, samples were also analyzed by RP-HPLC. Six phenolic acids such as gallic, protokatechuic, gentisic, hydrobenzoic, vanillic and caffeic acids were detected in the fraction of free phenolic acids of the methanol extract, irrespectively of the method used.
    Źródło:
    Acta Societatis Botanicorum Poloniae; 2013, 82, 4
    0001-6977
    2083-9480
    Pojawia się w:
    Acta Societatis Botanicorum Poloniae
    Dostawca treści:
    Biblioteka Nauki
    Artykuł
      Wyświetlanie 1-5 z 5

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