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    Wyświetlanie 1-8 z 8
    Tytuł:
    Effects of Sodium Chloride on Growth and Mineral Nutrition of Purpletop Vervain
    Autorzy:
    Salachna, P.
    Piechocki, R.
    Powiązania:
    https://bibliotekanauki.pl/articles/125276.pdf
    Data publikacji:
    2016
    Wydawca:
    Polskie Towarzystwo Inżynierii Ekologicznej
    Tematy:
    ion concentration
    salinity stress
    Verbena bonariensis
    clustertop vervain
    Opis:
    There is a rising demand for salt-tolerant species for landscaping. Purpletop vervain is an excellent landscape plant for gardens and parks, with fragrant lavender to rose-purple flowers. However, little is known concerning the effect of sodium chloride on morphological characteristics, flowering and mineral uptake of purpletop vervain. In this study, carried out in 2013–2014, the plants of purpletop vervain were grown in pots in an unheated plastic tunnel. The plants were watered with 200 mM NaCl solution four times, every seven days. Salinity-exposed plants were characterized by slightly reduced plant height, weight of the aboveground part and visual score. Salt stress caused also an increase in leaf content sodium, chlorine and manganese. Salinity had no effect on earliness of flowering and content in leaves of phosphorus, potassium, magnesium, copper, zinc and iron. Purpletop vervain seems to be plant species able to tolerate salt stress under controlled conditions.
    Źródło:
    Journal of Ecological Engineering; 2016, 17, 2; 148-152
    2299-8993
    Pojawia się w:
    Journal of Ecological Engineering
    Dostawca treści:
    Biblioteka Nauki
    Artykuł
    Tytuł:
    Plant Growth of Curly Kale Under Salinity Stress
    Autorzy:
    Salachna, P.
    Piechocki, R.
    Byczyńska, M.
    Powiązania:
    https://bibliotekanauki.pl/articles/952358.pdf
    Data publikacji:
    2017
    Wydawca:
    Polskie Towarzystwo Inżynierii Ekologicznej
    Tematy:
    sodium chloride
    ornamental plants
    stomatal conductance
    SPAD
    Opis:
    Ornamental plants growing in urban areas are exposed to soil salinity that negatively affects their quality. Identifying species that retain high ornamental value despite salt stress is therefore of high practical importance. Curly kale (Brassica oleracea L. var. sabellica L.) is an attractive plant with leaves of both edible and ornamental character. The aim of the study was to evaluate a response of ornamental curly kale to different concentrations of NaCl. The study material was ‘Scarlet’ cultivar. The plants were grown in pots in a plastic tunnel. They were irrigated with NaCl solution at the following concentrations: 50, 100, 200, 400, and 800 mM mmol·dm-3. NaCl treatment resulted in a significant increase in pH and electrical conductivity (EC) of the substrate. Salt stress significantly affected plant growth and number, width and length of leaves, and the effects depended on NaCl concentration. Fifteen days after the salt supply ceased, relative chlorophyll content in leaves (SPAD) decreased due to NaCl treatment in a concentration-dependent manner. Treatments with 200, 400, and 800 mmol·dm-3 NaCl reduced stomatal conductance, and the changes were greater on the 5th day following the stress cessation than on the 15th day. Irrigation with a 200, 400, and 800 mmol·dm-3 NaCl solution negatively affected plant bonitation score. The plants treated with 50 i 100 mmol·dm-3 NaCl were not significantly different visual score from the control plants.
    Źródło:
    Journal of Ecological Engineering; 2017, 18, 1; 119-124
    2299-8993
    Pojawia się w:
    Journal of Ecological Engineering
    Dostawca treści:
    Biblioteka Nauki
    Artykuł
    Tytuł:
    Response of Speckled Spur-Flower to Salinity Stress and Salicylic Acid Treatment
    Autorzy:
    Salachna, P.
    Piechocki, R.
    Zawadzińska, A.
    Wośkowiak, A.
    Powiązania:
    https://bibliotekanauki.pl/articles/124848.pdf
    Data publikacji:
    2015
    Wydawca:
    Polskie Towarzystwo Inżynierii Ekologicznej
    Tematy:
    Plectranthus ciliatus
    ion concentration
    purple leaved plectranthus
    salinity stress
    Opis:
    One of the limitations to using ornamental plants in green areas is too high salinity and alkalization of the soil. The adverse effect of salinity on plant growth and de-velopment may be effectively reduced by application of salicylic acid. Plectranthus ciliatus is an attractive bed plant with ornamental leaves, recommended for growing in containers, hanging baskets, or sunny borders. The aim of this study was to investi-gate the response of P. ciliatus to salicylic acid and calcium chloride. The plants were grown in pots in a glasshouse and were sprayed with solution of 0.5 mM salicylic acid and watered with 200 mM calcium chloride. The application of salicylic acid resulted in an increased weight of the aboveground parts, higher stomatal conductance and leaf greenness index and enhanced leaf content of nitrogen, potassium, iron and zinc. Salinity-exposed plants were characterized by reduced weight, stomatal conductance and leaf greenness index. Salt stress caused also a drop in leaf content of nitrogen, po-tassium and iron, and an increase in calcium, sodium, chlorine, copper and manganese concentration. Salicylic acid seemed to relieve salinity-mediated plant stress.
    Źródło:
    Journal of Ecological Engineering; 2015, 16, 5; 68-75
    2299-8993
    Pojawia się w:
    Journal of Ecological Engineering
    Dostawca treści:
    Biblioteka Nauki
    Artykuł
    Tytuł:
    Values of short-circuit duration and dynamie forces during short-circuits in the EHV substations: simulation-based investigations
    Autorzy:
    Frąckowiak, R.
    Piechocki, P.
    Powiązania:
    https://bibliotekanauki.pl/articles/97694.pdf
    Data publikacji:
    2014
    Wydawca:
    Politechnika Poznańska. Wydawnictwo Politechniki Poznańskiej
    Tematy:
    short-circuit duration
    EHV substations
    simulation
    Opis:
    Presented question is the continuation of investigations concerning the short-circuit duration’s estimation in the short-circuit effect calculations using the probabilistic method. In the paper, the developed simulation model of the short circuit duration under the disturbing conditions just in the distribution substation is presented. The model development was based on the analysis of operation of the automatic power protections EAZ and circuit-breakers in the EHV substations during short-circuits. The results of simulation investigations aiming to estimate the frequency of occurrence of the defined short-circuit duration are reported. The calculations have been carried out for different configurations of the EAZ system. For selected spans in the 220 kV substation, probabilistic analysis of dynamic forces accompanying the in-substation faults has been carried out. Also, the way of the short-circuit duration’s estimation when calculating the dynamic effects of the fault current flow basing on an assumed risk value has been proposed.
    Źródło:
    Computer Applications in Electrical Engineering; 2014, 12; 171-184
    1508-4248
    Pojawia się w:
    Computer Applications in Electrical Engineering
    Dostawca treści:
    Biblioteka Nauki
    Artykuł
    Tytuł:
    Factors affecting the choice of fault duration in transmission lines for computation of dynamic effects in EHV distribution substations
    Autorzy:
    Frąckowiak, R.
    Piechocki, P.
    Powiązania:
    https://bibliotekanauki.pl/articles/97263.pdf
    Data publikacji:
    2013
    Wydawca:
    Politechnika Poznańska. Wydawnictwo Politechniki Poznańskiej
    Tematy:
    substation
    dynamic effect
    short-circuit duration
    probabilistic method
    Opis:
    In the paper, the method of assessment of the fault duration in transmission line regard¬ing dynamic effects in the EHV distribution stations with flexible bus conductors is pre¬sented. Expected yearly frequency of exceeding the indicated dynamic forces has been assumed to be a criterion of choice of the short-circuit duration values. Results of simula¬tions carried out using Monte Carlo technique have shown the influence of parameters of the distribution substation and devices installed in it (nominal voltage, short-circuit capaci¬ty, unreliability of circuit-breakers and protections, EAZ configurations) on suggested fault duration values in the engineer-type short-circuit computations.
    Źródło:
    Computer Applications in Electrical Engineering; 2013, 11; 176-188
    1508-4248
    Pojawia się w:
    Computer Applications in Electrical Engineering
    Dostawca treści:
    Biblioteka Nauki
    Artykuł
    Tytuł:
    Short-circuit duration and dynamic forces in central section of substation
    Autorzy:
    Frąckowiak, R.
    Piechocki, P.
    Powiązania:
    https://bibliotekanauki.pl/articles/97305.pdf
    Data publikacji:
    2015
    Wydawca:
    Politechnika Poznańska. Wydawnictwo Politechniki Poznańskiej
    Tematy:
    EHV distribution substations
    short-circuit dynamic effects
    simulations
    Opis:
    Presented topic is the continuation of investigations concerning the estimation of short-circuit duration when computing the short-circuit effects using probabilistic methods. In the paper, an expanded model of distribution substation for simulation-based analysis of the short-circuit conditions and dynamic effects in the central section of bus-bar is presented. In the model, the operation of protections in the transformer bay has also been considered. The results of simulations aiming to assess the frequency of occurrence of the defined values of short-circuit current, short-circuit duration and dynamic forces are reported. Also, the question: “How the transformer’s protections involved in simulation affect the simulated short-circuit conditions?” has been answered. Computations have been carried out for four different EAZ system configurations.
    Źródło:
    Computer Applications in Electrical Engineering; 2015, 13; 220-230
    1508-4248
    Pojawia się w:
    Computer Applications in Electrical Engineering
    Dostawca treści:
    Biblioteka Nauki
    Artykuł
    Tytuł:
    Probabilistic assessment of the short-circuit duration on the 220 kV transmission line basing on simulation analysis
    Autorzy:
    Frąckowiak, R.
    Piechocki, P.
    Powiązania:
    https://bibliotekanauki.pl/articles/97379.pdf
    Data publikacji:
    2012
    Wydawca:
    Politechnika Poznańska. Wydawnictwo Politechniki Poznańskiej
    Tematy:
    transmission lines
    current
    simulation analysis
    Opis:
    In the paper, the problem of defining the short circuit duration time for the short-circuit effect calculations, especially thermal and electromagnetic ones, has been discussed. In author’s opinion, the results of probabilistic research could be helpful when resolving the problem. Therefore, a tailored simulation model based on the analysis of the protections and circuit breakers operation during the transmission lines fault clearance has been developed. Due to the results of simulation study, the found values of the fault duration time could be related to the expected risk of their exceeding depending on both the protection system configuration and the type of the circuit breakers applied.
    Źródło:
    Computer Applications in Electrical Engineering; 2012, 10; 275-282
    1508-4248
    Pojawia się w:
    Computer Applications in Electrical Engineering
    Dostawca treści:
    Biblioteka Nauki
    Artykuł
    Tytuł:
    Invasion in New Zeland snail Potamopyrgus antipodarum (Gray, 1843) in the lakes of Bory Tucholskie
    Autorzy:
    Piechocki, A.
    Kaleta, R.
    Powiązania:
    https://bibliotekanauki.pl/articles/84383.pdf
    Data publikacji:
    2001
    Wydawca:
    Uniwersytet Mikołaja Kopernika. Wydział Biologii i Ochrony Środowiska. Stowarzyszenie Malakologów Polskich
    Źródło:
    Folia Malacologica; 2001, 09, 2
    1506-7629
    Pojawia się w:
    Folia Malacologica
    Dostawca treści:
    Biblioteka Nauki
    Artykuł
      Wyświetlanie 1-8 z 8

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