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    Wyświetlanie 1-9 z 9
    Tytuł:
    Drainage wells as an integral part of a deep dewatering system in Szczerców field in the Bełchatów Lignite Mine
    Autorzy:
    Gasiński, J.
    Macuda, J.
    Szewczyk, S.
    Powiązania:
    https://bibliotekanauki.pl/articles/298930.pdf
    Data publikacji:
    2017
    Wydawca:
    Akademia Górniczo-Hutnicza im. Stanisława Staszica w Krakowie. Wydawnictwo AGH
    Tematy:
    dewatering of rock mass
    wells
    large-diameter dewatering wells
    drainage wells
    groundwater
    open-pit mining
    extraction of lignite
    Opis:
    The open-pit extraction of lignite in the Bełchatów Lignite Mine can be conducted after prior deep dewatering of the rock mass, realized with large-diameter dewatering wells distributed in the form of outer and inner barriers. This type of dewatering system allows for safe extraction of lignite, however residual waters in the overburden may locally create hazard. These are rain waters infiltrating into the rock mass, and which, due to the complicated geological structure of the deposit and disturbed system of layers, were not intaken by wells belonging to the primary dewatering system. They are removed through the existing and newly drilled exploration wells, which are converted into drainage wells. Such wells are used for removing waters suspended in permeable overburden and gravitationally moved to the lower absorbing layers, from where they are directed to the primary dewatering system wells and then to the surface water courses. The applied enhancement of the dewatering system used in the lignite deposit significantly improves the safety of mining works conducted in this place. Technical and technological aspects of drilling dewatering wells in Bełchatów Lignite Mine are discussed in this paper and followed by the evaluation of efficiency of dewatering of the overburden.
    Źródło:
    AGH Drilling, Oil, Gas; 2017, 34, 2; 455-463
    2299-4157
    2300-7052
    Pojawia się w:
    AGH Drilling, Oil, Gas
    Dostawca treści:
    Biblioteka Nauki
    Artykuł
    Tytuł:
    Auxiliary gravity drain and infiltration wells supporting basic drainage system in the “Bełchatów” Lignite Mine
    Autorzy:
    Macuda, J.
    Gasiński, J.
    Grad, J.
    Szewczyk, S.
    Powiązania:
    https://bibliotekanauki.pl/articles/299020.pdf
    Data publikacji:
    2018
    Wydawca:
    Akademia Górniczo-Hutnicza im. Stanisława Staszica w Krakowie. Wydawnictwo AGH
    Tematy:
    Bełchatów Lignite Mine
    Bełchatów lignite field
    drainage
    dewatering of opencast mine
    mine gravity drain well
    gravity infiltration well
    dewatering wells
    residual water
    Opis:
    The downhole parts of the “Bełchatów” Lignite Mine are dewatered through large diameter dewatering wells belonging to the primary drainage system. This system is supported by additional shallow wells performed in the overburden, in the forefield of extraction site or on the extraction site itself. They are used for limiting and removing residual water from extraction site, which corresponds to the height of excavator level. They are preceded by the analysis of dewatering of the mining benches based on the results of control drilling and observation of the water table in the existing piezometric wells. Shallow auxiliary wells are drilled with the “dry” rotary method to about 30 m of depth. Such wells considerably reduce the amount of water coming to the mine with rainwaters, and which were not captured by wells of the primary drainage system. This is mainly caused by such factors as complex geological build, disturbed system of strata, presence of synclinal structures and closed lenses. The technique and technology of drilling supporting shallow wells with the “dry” rotary method and their effect on dewatering of active extraction sites are discussed in this paper.
    Źródło:
    AGH Drilling, Oil, Gas; 2018, 35, 1; 245-253
    2299-4157
    2300-7052
    Pojawia się w:
    AGH Drilling, Oil, Gas
    Dostawca treści:
    Biblioteka Nauki
    Artykuł
    Tytuł:
    Implementation of constant component filter in measurements of random telegraph signal noise
    Realizacja układu filtru usuwającego składową stałą w pomiarach szumów wybuchowych
    Autorzy:
    Szewczyk, A.
    Babicz, S.
    Dudziak, A.
    Powiązania:
    https://bibliotekanauki.pl/articles/268664.pdf
    Data publikacji:
    2012
    Wydawca:
    Politechnika Gdańska. Wydział Elektrotechniki i Automatyki
    Tematy:
    filtr
    składowa stała
    RTS
    RTS noise
    DC filter
    active filter
    Opis:
    Noise is generated in all semiconductor devices. The intensity of these fluctuations depends on used elements, manufacturing process, operating conditions and device type. The result noise is a superposition of different kinds of fluctuations like thermal noise, generation-recombination noise, 1/f noise, shot noise and Random Telegraph Signal (RTS) noise. The last one, RTS noise is observed as nonstationary impulse fluctuations. Unfortunately, it is hard to notice and investigate the RTS because of DC component value in contradiction to small amplitude of noise impulses. In the paper a simple filtrating system which removes the DC component without AC signal distortion is presented. Example oscilloscope measurement results and their analysis are also shown.
    Szum jest generowany przez wszystkie urządzenia półprzewodnikowe. Szum wynikowy jest zwykle efektem superpozycji różnych rodzajów fluktuacji: szumu termicznego, szumu generacyjno-rekombinacyjnego, szumu 1/f i RTS. Ten ostatni, Random Telegraph Signal, jest obserwowany jako pojedyncze, niestacjonarne impulsy w badanym sygnale. Niestety, z powodu małej amplitudy oraz znacznej wartości składowej stałej, szum RTS jest bardzo trudny do obserwacji, co znacząco utrudnia jego badanie. W celu zwiększenia dokładności pomiaru, należy usunąć składową stałą z badanego sygnału. W artykule przedstawiono system odzyskujący składową stałą, a następnie odejmujący ją od sygnału wejściowego. W efekcie w sygnale wyjściowym otrzymuje się sygnał bez składowej stałej, w którym łatwiej jest zaobserwować i zbadać przebieg RTS.
    Źródło:
    Zeszyty Naukowe Wydziału Elektrotechniki i Automatyki Politechniki Gdańskiej; 2012, 31; 127-130
    1425-5766
    2353-1290
    Pojawia się w:
    Zeszyty Naukowe Wydziału Elektrotechniki i Automatyki Politechniki Gdańskiej
    Dostawca treści:
    Biblioteka Nauki
    Artykuł
    Tytuł:
    La$\text{}_{0.7}$Sr$\text{}_{0.3}$MnO$\text{}_{3}$ Thin-Film Grain-Boundary Junctions on a Bi-Crystal Substrate
    Autorzy:
    Gierłowski, P.
    Szewczyk, A.
    Abal'oshev, A. V.
    Vlakhov, E. S.
    Donchev, T. I.
    Blagoev, B.
    Powiązania:
    https://bibliotekanauki.pl/articles/2041462.pdf
    Data publikacji:
    2004-11
    Wydawca:
    Polska Akademia Nauk. Instytut Fizyki PAN
    Tematy:
    75.47.Lx
    75.47.Gk
    72.25.Mk
    Opis:
    Transport properties of 10μm to 30μm wide grain-boundary junctions ion-etched in thin colossal magnetoresistance La$\text{}_{0. 7}$Sr$\text{}_{0.3}$MnO$\text{}_{3}$ films deposited on a SrTiO$\text{}_{3}$ bi-crystal were investigated. We have measured the current-voltage characteristics in the temperature range from 4.2 K to 300 K without applied magnetic field, as well as the magnetoresistance at magnetic fields up to±10 kOe directed parallel to the film surface, both perpendicular and parallel to the direction of current flow through the junctions. The investigated junctions have nonlinear current-voltage characteristics in this temperature range and consist of several magnetic domains. The maximum magnetoresistance (R(H)-R $\text{}_{max}$)/R$\text{}_{max}$, measured at 1 kOe was -17.6% at 4.1 K.
    Źródło:
    Acta Physica Polonica A; 2004, 106, 5; 715-719
    0587-4246
    1898-794X
    Pojawia się w:
    Acta Physica Polonica A
    Dostawca treści:
    Biblioteka Nauki
    Artykuł
    Tytuł:
    Topinambur - new possibilities for use in a supplementation diet
    Autorzy:
    Szewczyk, A.
    Zagaja, M.
    Bryda, J.
    Kosikowska, U.
    Stepien-Pysniak, D.
    Winiarczyk, S.
    Andres-Mach, M.
    Powiązania:
    https://bibliotekanauki.pl/articles/2082014.pdf
    Data publikacji:
    2018
    Wydawca:
    Instytut Medycyny Wsi
    Tematy:
    Topinambur
    microbiota
    prebiotics
    biofuels
    Opis:
    Jerusalem artichoke (Helianthus tuberosus Linne) is a tuberous perennial plant of the Asteraceae family, which originates from North America, and is also known as wild sunflower or topinambur (TPB). It is characterized by good tolerance to frost, drought and poor soil, strong resistance to pests and plant diseases. For ages it was cultivated due to being both an edible tuber and having healing properties. In folk medicine, TPB leaves are used for the treatment of bone fractures and pain. TPB tubers are rich in sugar and have therefore been used for the production of functional food ingredients, such as inulin. Moreover, TPB is one of the potential crops for bioenergy production, such as bioethanol, biobuthanol and biodiesel, and chemicals (lactic acid, butyric acid). A number of bioactive compounds from the above ground parts of this plant have been isolated which have demonstrating antifungal, antioxidant and anticancer activities. In recent years, a number of animal experiments have been carried out to assess the health properties of TPB. Obtained results show that TPB possess a wide spectrum of medical applications, e.g. reduction in the levels of plasma glucose, total cholesterol and triglyceride. Interestingly, TPB has been shown to be a valuable alternative source of prebiotic compounds. This review article presents recent scientific reports on the chemical and biological properties of TPB and its potential use as a prebiotic diet supplement.
    Źródło:
    Annals of Agricultural and Environmental Medicine; 2019, 26, 1; 24-28
    1232-1966
    Pojawia się w:
    Annals of Agricultural and Environmental Medicine
    Dostawca treści:
    Biblioteka Nauki
    Artykuł
    Tytuł:
    Effects of silvicultural techniques on the diversity of microorganisms in forest soil and their possible participation in biological control of Armillaria and Heterobasidion
    Autorzy:
    Kwasna, H.
    Walkowiak, L.
    Lakomy, P.
    Behnke-Borowczyk, J.
    Gornowicz, R.
    Mikicinski, A.
    Galazka, S.
    Szewczyk, W.
    Powiązania:
    https://bibliotekanauki.pl/articles/65397.pdf
    Data publikacji:
    2015
    Wydawca:
    Polska Akademia Nauk. Czytelnia Czasopism PAN
    Tematy:
    silvicultural technique
    Pinus sylvestris
    diversity
    microorganism
    forest soil
    participation
    biological control
    Armillaria
    fungi
    Heterobasidion
    Opis:
    Effects of different pre-planting soil preparations and post-harvest wood debris applications in a clear-cut Scots pine plantation, on the abundance, diversity, and activity of culturable microorganisms were investigated. The investigation was done 9 years after the re-plantings had been done. This formed part of an investigation of silvicultural practices for conservation and the biological control of Armillaria and Heterobasidion in northern temperate forests (Poland). The treatments being compared, were expected to have altered the soil’s physical and chemical properties, and consequently, its biological properties. Only soft-rot microfungi from the Ascomycota and Zygomycota were detected in the soil. Fungi, including those antagonistic to Armillaria and Heterobasidion, were more abundant after shallow ploughing than after deep ploughing or ridging, and where chipped rather than coarse wood debris was left on the soil surface or incorporated. Scots pine trees had the most biomass and the least mortality after ridging and leaving coarse wood debris on the surface (associated with only a relatively moderate abundance of fungi).
    Źródło:
    Journal of Plant Protection Research; 2015, 55, 3
    1427-4345
    Pojawia się w:
    Journal of Plant Protection Research
    Dostawca treści:
    Biblioteka Nauki
    Artykuł
    Tytuł:
    Structural, Magnetic and Transport Properties οf $NdBaCo_{2}O_{5+x}$ Thin Films Deposited by Magnetron Sputtering
    Autorzy:
    Vlakhov, E.
    Szymczak, R.
    Baran, M.
    Piotrowski, K.
    Szewczyk, A.
    Paszkowicz, W.
    Lobanovskii, L.
    Matyajasik, S.
    Nenkov, K.
    Szymczak, H.
    Powiązania:
    https://bibliotekanauki.pl/articles/1810303.pdf
    Data publikacji:
    2009-01
    Wydawca:
    Polska Akademia Nauk. Instytut Fizyki PAN
    Tematy:
    75.70.Ak
    64.75.St
    64.75.Lm
    Opis:
    For the first time, thin films of $NdBaCo_{2}O_{5+x}$ were deposited by RF magnetron sputtering on different substrates. The films deposited on $SrLaAlO_4(001)$ substrates exhibited highly textured structure with c-axis directed out-of-plane. Magnetic measurements M vs. T of three $NdBaCo_{2}O_{5+x}$/$SrLaAlO_4(001)$ films revealed successively paramagnetic-ferromagnetic-antiferromagnetic transitions with decrease in temperature. Their paramagnetic Curie-Weiss temperatures were estimated to be in the range of $T_{C}$ =100-116 K. Resistivity of the cobaltite thin film exhibited insulating behavior and the best fit was found for the variable range hopping mechanism.
    Źródło:
    Acta Physica Polonica A; 2009, 115, 1; 89-91
    0587-4246
    1898-794X
    Pojawia się w:
    Acta Physica Polonica A
    Dostawca treści:
    Biblioteka Nauki
    Artykuł
    Tytuł:
    Atomic Order and the Interaction of Electronic and Magnetic Subsystems in Epitaxial LaSr(Ca)MnO Films
    Autorzy:
    Okunev, V. D.
    Samoilenko, Z. A.
    D'yachenko, T.
    Abal'oshev, A.
    Baran, M.
    Gierłowski, P.
    Lewandowski, S. J.
    Szewczyk, A.
    Szymczak, R.
    Powiązania:
    https://bibliotekanauki.pl/articles/2037110.pdf
    Data publikacji:
    2004
    Wydawca:
    Polska Akademia Nauk. Instytut Fizyki PAN
    Tematy:
    75.30.Kz
    75.47.Lx
    61.50.Ks
    Opis:
    We have investigated the structure, and electric, optical, and magnetic properties of LaSr(Ca)MnO films containing atomic clusters of various types coherently built into the basic crystallographic matrix. Below the transition to the metallic state, the electrical conductivity of the films is determined by tunneling of charge carriers between metallic clusters. We have found that for each sample there exists a threshold value of magnetic ordering, above which the magnetic subsystem starts to affect actively the film conductivity. The observed increase of conductivity with decreasing temperature is caused by the fact that in the process of magnetic ordering of the samples the cluster size and concentration of metallic phase increase. Experimental results are in agreement with theoretical calculations.
    Źródło:
    Acta Physica Polonica A; 2004, 105, 1-2; 121-126
    0587-4246
    1898-794X
    Pojawia się w:
    Acta Physica Polonica A
    Dostawca treści:
    Biblioteka Nauki
    Artykuł
    Tytuł:
    Application of polymer- and graphene- based materials in biomedical research
    Autorzy:
    Sekuła, M.
    Domalik-Pyzik, P.
    Noga, S.
    Karnas, E.
    Kosowska, K.
    Hunger, M.
    Złocista-Szewczyk, N.
    Jagiełło, J.
    Lipińska, L.
    Pielichowska, K.
    Chłopek, J.
    Zuba-Surma, E.
    Powiązania:
    https://bibliotekanauki.pl/articles/283753.pdf
    Data publikacji:
    2018
    Wydawca:
    Akademia Górniczo-Hutnicza im. Stanisława Staszica w Krakowie. Polskie Towarzystwo Biominerałów
    Tematy:
    polymers
    graphene
    regenerative medicine
    Źródło:
    Engineering of Biomaterials; 2018, 21, 148; 66
    1429-7248
    Pojawia się w:
    Engineering of Biomaterials
    Dostawca treści:
    Biblioteka Nauki
    Artykuł
      Wyświetlanie 1-9 z 9

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