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    Wyświetlanie 1-10 z 10
    Tytuł:
    Influence of Fe and Si Addition on the Properties and Structure Conductivity Aluminium
    Autorzy:
    Jabłoński, M.
    Knych, T.
    Mamala, A.
    Smyrak, B.
    Wojtaszek, K.
    Powiązania:
    https://bibliotekanauki.pl/articles/354843.pdf
    Data publikacji:
    2017
    Wydawca:
    Polska Akademia Nauk. Czytelnia Czasopism PAN
    Tematy:
    Al-Fe-Si alloy
    horizontal direct chill casting
    wire drawing process
    electrical conductivity
    Opis:
    The effect of iron and silicon addition on the structure and properties of aluminium wire rod obtained in the laboratory horizontal direct chill casting process has been analysed. In addition, the impact of laboratory wire drawing process has been examined. The addition of iron and velocity of casting increase the strength of aluminium wire rod in as-cast condition while the electrical conductivity drop acceptable. Moreover, the laboratory wire drawing process causes work-hardening wires and increase drawing tension as a result of fragmentation of structure and growth of grain boundaries. It has been shown that iron is beneficial for mechanical and technological properties of aluminium.
    Źródło:
    Archives of Metallurgy and Materials; 2017, 62, 3; 1541-1547
    1733-3490
    Pojawia się w:
    Archives of Metallurgy and Materials
    Dostawca treści:
    Biblioteka Nauki
    Artykuł
    Tytuł:
    Electrochemical Method of Copper Powder Synthesis on Rotating Electrode in the Presence of Surfactants
    Autorzy:
    Wojtaszek, K.
    Cebula, F.
    Partyka, B.
    Deszcz, P.
    Włoch, G.
    Socha, R. P.
    Woźny, K.
    Żabiński, Piotr
    Wojnicki, Marek
    Powiązania:
    https://bibliotekanauki.pl/articles/2203711.pdf
    Data publikacji:
    2023
    Wydawca:
    Polska Akademia Nauk. Czytelnia Czasopism PAN
    Tematy:
    copper powder
    electrochemical synthesis
    rotating electrode
    ethylene glycol
    Opis:
    This paper presents a method of synthesizing copper powders by electrochemical method with the use of a rotating working electrode. The influence of the rotation speed of the working electrode, the current density, the concentration of copper ions, and the addition of ethylene glycol on the shape, size, and size distribution of the obtained powders were investigated. Properties of the synthesized powders were characterized by scanning electron microscopy (SEM) and X-ray powder diffractometry (XRD). It has been shown that it is possible to obtain copper powders with a size of 1 µm by an electrochemical method using the rotary cathode, in sulphate bath with addition of ethylene glycol as a surfactant. Increasing current density causes a decrease in the average size of the obtained powder particles. The addition of 2.5% of ethylene glycol prevents the formation of dendritic powders. The change in the concentration of copper ions in the range from 0.01 to 0.15 mol/dm3 in the electrolyte did not show any significant effect on the size of obtained particles. However, higher concentrations of copper limiting the presence of dendritic-shape particles. Changing the speed of rotation of the electrode affects both the size and the shape of synthesized copper powder. For the rotational speed of the electrode of 115 rpm, the obtained powders have a size distribution in the range of 0-3 µm and an average particle size of 1 µm. The particles had a polygonal shape with an agglomeration tendency.
    Źródło:
    Archives of Metallurgy and Materials; 2023, 68, 1; 375--386
    1733-3490
    Pojawia się w:
    Archives of Metallurgy and Materials
    Dostawca treści:
    Biblioteka Nauki
    Artykuł
    Tytuł:
    The Design of Ti-5Al-5Mo-5V-3Cr Elemental Powders Mixture Processing
    Autorzy:
    Zyguła, K.
    Wojtaszek, M.
    Powiązania:
    https://bibliotekanauki.pl/articles/352015.pdf
    Data publikacji:
    2020
    Wydawca:
    Polska Akademia Nauk. Czytelnia Czasopism PAN
    Tematy:
    titanium alloy
    powder metallurgy
    microstructure
    mechanical properties
    compaction
    Opis:
    The aim of the study was to indicate the influence of consolidation processes on microstructure and selected mechanical properties of powder metallurgy Ti-5Al-5Mo-5V-3Cr alloy, which was produced by blending of elemental powders method. Morphology of the mixture and its ingredients were examined using scanning electron microscopy. The consolidation of powders mixture was conducted using two approaches. The first consisted of the uniaxial hot pressing process, the second included two steps – uniaxial cold pressing process and sintering under argon protective atmosphere. Microstructural analysis was performed for both as-pressed compacts using light microscopy. Additionally, computed tomography studies were carried out, in order to examine the internal structure of compacts. Chosen mechanical properties, such as Vickers hardness and compression strength was also determined and compared. The conducted research proves that the proposed production method leads to obtain materials with no structural defects and relatively low porosity. Moreover, due to the proper selection of manufacturing parameters, favorable microstructures can be received, as well as mechanical properties, which are comparable to conventionally produced material with the corresponding chemical composition.
    Źródło:
    Archives of Metallurgy and Materials; 2020, 65, 1; 283-289
    1733-3490
    Pojawia się w:
    Archives of Metallurgy and Materials
    Dostawca treści:
    Biblioteka Nauki
    Artykuł
    Tytuł:
    Napływ i dynamika bezpośrednich inwestycji zagranicznych w sektorze rolniczym w Polsce w latach 2005-2014
    Inflows and dynamics of foreign direct investments in the agricultural sector in Poland in the years 2005-2014
    Autorzy:
    Klusek, K.
    Wojtaszek, M.
    Powiązania:
    https://bibliotekanauki.pl/articles/870324.pdf
    Data publikacji:
    2017
    Wydawca:
    The Polish Association of Agricultural and Agribusiness Economists
    Opis:
    Celem opracowania jest określenie poziomu, dynamiki oraz struktury bezpośrednich inwestycji zagranicznych oraz ich wpływu na rozwój sektora rolniczego w Polsce. Badania obejmowały okres 2005-2014. Z badań wynika, Wyniki badań potwierdziły pozytywny wpływ bezpośrednich inwestycji na wzrost liczby podmiotów i wydajności pracy w sektorze rolniczym. Wykazano także ich negatywny wpływ na ogólne zatrudnienie w sektorze rolniczym. Kapitał podstawowy w 2014 roku był ponaddwukrotnie wyższy niż na początku badanego okresu.
    The aim of the study was to show the level dynamics and structure of foreign direct investments and their impact on the development of the agricultural sector in Poland. The study covers the period 2005- 2014. The results show the positive impact of direct investment on the increase in the number of entities, and labor productivity in the agricultural sector. Also show a negative impact on overall employment in the agricultural sector. Share capital in 2014 was more than twice higher than at the beginning of the period.
    Źródło:
    Roczniki Naukowe Stowarzyszenia Ekonomistów Rolnictwa i Agrobiznesu; 2017, 19, 1
    1508-3535
    2450-7296
    Pojawia się w:
    Roczniki Naukowe Stowarzyszenia Ekonomistów Rolnictwa i Agrobiznesu
    Dostawca treści:
    Biblioteka Nauki
    Artykuł
    Tytuł:
    Evaluation of the natural and tourism space of Stobrawski Landscape Park
    Autorzy:
    Stelmaszyk, M.
    Ziernicka-Wojtaszek, A.
    Król, K.
    Powiązania:
    https://bibliotekanauki.pl/articles/100965.pdf
    Data publikacji:
    2018
    Wydawca:
    Polska Akademia Nauk. Stowarzyszenie Infrastruktura i Ekologia Terenów Wiejskich PAN
    Tematy:
    natural and tourism values
    assessment
    landscape
    sustainable tourism
    Opolskie Voivodeship
    Opis:
    The paper describes and evaluates the space of Stobrawski Landscape Park located in the north-western part of Opolskie Voivodeship. The study on natural and tourism values was conducted by the “classification-by-points” method. The following evaluation criteria were adopted for the natural values: forestation rate, heterogeneity, the occurrence of natural protection forms and the occurrence of surface water, while for the tourism values, the criteria included: cultural diversity, the number of objects of historical value, the length of tourist trails, the presence of educational paths, and the occurrence of accommodation and catering facilities. Three evaluations, namely natural, tourism, and comprehensive tourism-and-natural evaluation, were carried out. The Head Office of Land Surveying and Cartography data, specialist literature, and field research results were used. The conducted analysis revealed the spatial diversity of the park’s assets, which allows the authors to suggest measures aimed at exploiting the tourism potential of the area concerned while observing the principle of sustainable development. In terms of the natural environment, the most valuable fragments of the area under study are river valleys, particularly the Oder river valley, and the north-western part of the park where, inter alia, 4 nature reserves are located. In view of the low tourism traffic in the park, there is no concern about the loss of natural values of this area due to tourists’ pressure.
    Źródło:
    Infrastruktura i Ekologia Terenów Wiejskich; 2018, IV/1; 999-1019
    1732-5587
    Pojawia się w:
    Infrastruktura i Ekologia Terenów Wiejskich
    Dostawca treści:
    Biblioteka Nauki
    Artykuł
    Tytuł:
    Zmiany czasu trwania meteorologicznego okresu wegetacyjnego w Polsce w latach 1971–2000 oraz 1981–2010
    The changes in the duration of the meteorological vegetation period in Poland in the years 1971–2000 and 1981–2010
    Autorzy:
    Krużel, J.
    Ziernicka-Wojtaszek, A.
    Borek, Ł.
    Ostrowski, K.
    Powiązania:
    https://bibliotekanauki.pl/articles/950010.pdf
    Data publikacji:
    2015
    Wydawca:
    Polskie Towarzystwo Inżynierii Ekologicznej
    Tematy:
    meteorologiczny okres wegetacyjny
    temperatura
    zmiany klimatu
    Polska
    meteorological vegetation period
    temperature
    climate change
    Polska
    Opis:
    W pracy przeanalizowano zmiany czasu trwania meteorologicznego okresu wegetacyjnego w Polsce w trzydziestoleciu 1981–2010 w porównaniu z okresem 1971–2000. Wykorzystano dane meteorologiczne dotyczące średnich miesięcznych wartości temperatury powietrza z 53 stacji meteorologicznych rozmieszczonych równomiernie na obszarze Polski. Wykazano, że czas trwania meteorologicznego okresu wegetacyjnego w latach 1981–2010 wydłużył się średnio o 4 dni w stosunku do okresu 1971–2000.
    In this paper, changes in the duration of the meteorological vegetation period in Poland were analyzed for the three decade period: 1981–2010 as compared to the 1971–2000 period. The meteorological data regarding the monthly mean air temperature values from 53 weather stations distributed evenly across Poland were used. It was proved that the meteorological vegetation period in the years 1981–2010 increased by four days on average, as compared to the 1971–2000 period.
    Źródło:
    Inżynieria Ekologiczna; 2015, 44; 47-52
    2081-139X
    2392-0629
    Pojawia się w:
    Inżynieria Ekologiczna
    Dostawca treści:
    Biblioteka Nauki
    Artykuł
    Tytuł:
    Freshwater biodiversity crisis: macroinvertebrates’ response along the downstream gradient to receiving effluent from a wastewater treatment plant
    Autorzy:
    Kędzior, R.
    Dacewicz, E.
    Ziernicka-Wojtaszek, A.
    Chmielowski, K.
    Powiązania:
    https://bibliotekanauki.pl/articles/53639055.pdf
    Data publikacji:
    2023
    Wydawca:
    Uniwersytet Warmińsko-Mazurski w Olsztynie / Polskie Towarzystwo Magnezologiczne im. Prof. Juliana Aleksandrowicza
    Opis:
    Suburban watercourses receiving sewage effluents often are low-flow and not modified, unlike large rivers to which wastewater is discharged. The impact of chemical pollutants on biodiversity as well as the effectiveness of ecosystem recovery and self-purification are worth careful attention. The aim was to assess the macroinvertebrates’ responses to receiving an input from a wastewater treatment plant (WWTP) along the downstream gradient. We studied the variability and recovery pattern of macroinvertebrates in six sections located along a sewage receiving stream continuum. The comparison of chemical parameters showed significant differences in the pH, BOD5, N-NH4+ and PO43-. At sites 100, 300 and 500 m downstream of the WWTP, the persistently high amount of pathogenic coliform bacteria testified to the high impact of bacteriological pollution of sewage on the receiver. Based on 18013 macroinvertebrates, nonmetric multidimensional scaling showed differences between the assemblages at the sections upstream of the WWTP, and located downstream. Effluent discharge affected the macroinvertebrate, causing a decrease of its quantitative index (abundance) by 7% and qualitative index (EPT) by 26% at the site of the sewage discharge. The recovery pattern was manifested by the gradual increase in macoinvertebrate indices at the sites located downstream from the WWTP, which at distances of 300 m and 500 m from the discharge site attained comparable values to those at the reference sites upstream of the WWTP. The populations of the most sensitive taxa were not fully restored with increasing distance from the WWTP, even at a distance of 500 meters, but instead were replaced by more resistant taxa. More attention should be paid to the impact of wastewater discharge from suburban wastewater treatment plants on receiving watercourse biodiversity and ecological water conditions, especially in the case of small and lowflow sewage receivers, where self-purification processes are difficult.
    Źródło:
    Journal of Elementology; 2023, 28, 4; 1311-1328
    1644-2296
    Pojawia się w:
    Journal of Elementology
    Dostawca treści:
    Biblioteka Nauki
    Artykuł
    Tytuł:
    Architecture of the exocyst complex in plant cells
    Autorzy:
    Kasprowicz, A.
    Pihan, K.
    Ochocki, M.
    Kwiatkowski, W.
    Wojtaszek, P.
    Powiązania:
    https://bibliotekanauki.pl/articles/80552.pdf
    Data publikacji:
    2013
    Wydawca:
    Polska Akademia Nauk. Czytelnia Czasopism PAN
    Tematy:
    conference
    exocytosis
    plant cell
    eukaryotic cell
    plasma membrane
    protein-protein interaction
    Źródło:
    BioTechnologia. Journal of Biotechnology Computational Biology and Bionanotechnology; 2013, 94, 3
    0860-7796
    Pojawia się w:
    BioTechnologia. Journal of Biotechnology Computational Biology and Bionanotechnology
    Dostawca treści:
    Biblioteka Nauki
    Artykuł
    Tytuł:
    A comparative study of antioxidant enzyme activities in tissues of Helix aspersa (O.F.Mull.) and Pomacea bridgesi (Reeve)
    Autorzy:
    Dziewulska-Szwajkowska, D.
    Lozinska-Gabska, M.
    Wojtaszek, J.
    Miazek, K.
    Dzugaj, A.
    Powiązania:
    https://bibliotekanauki.pl/articles/83948.pdf
    Data publikacji:
    2001
    Wydawca:
    Uniwersytet Mikołaja Kopernika. Wydział Biologii i Ochrony Środowiska. Stowarzyszenie Malakologów Polskich
    Opis:
    Antioxidant enzymes: catalase (CAT) [EC 1.11.1.6], peroxidase [EC 1.11.1.7], glutathione reductase (GSSGR) [EC 1.6.4.2] and glucose-6-phosphate dehydrogenase (G6PDH) [EC 1.1.1.49] were investigated in terrestrial Helix aspersa (O.F. Müll.) and aquatic Pomacea bridgesi (Reeve). The activity was determined in the heamolymph and homogenates of hepatopancreas and foot muscle. No CAT and peroxidase activity was detected in the hepatopancreas and foot muscle of P. bridgesi, and its haemolymph displayed a very low CAT activity (0.005 U/mg of protein). In H. aspersa the highest activities (U/g) observed for CAT and GSSGR in the hepatopancreas were 0.40, and 1.05, respectively; for peroxidase and G6PDH in the foot muscle the respective values were 1.22 and 0.22. The activities of antioxidant enzymes determined in both snail species are much lower than the corresponding values for mammalian tissues.
    Źródło:
    Folia Malacologica; 2001, 09, 1
    1506-7629
    Pojawia się w:
    Folia Malacologica
    Dostawca treści:
    Biblioteka Nauki
    Artykuł
    Tytuł:
    The value of three-dimensional computed tomography reconstructions in diagnosis of shoulder injuries
    Autorzy:
    Krupski, W.
    Fidor-Mikita, E.
    Kurys-Denis, E.
    Krzyzanowski, K.
    Kostrubiec, M.
    Wojtaszek, M.
    Maciejewski, R.
    Zlomaniec, J.
    Powiązania:
    https://bibliotekanauki.pl/articles/3275.pdf
    Data publikacji:
    2008
    Wydawca:
    Instytut Medycyny Wsi
    Źródło:
    Journal of Pre-Clinical and Clinical Research; 2008, 02, 1
    1898-2395
    Pojawia się w:
    Journal of Pre-Clinical and Clinical Research
    Dostawca treści:
    Biblioteka Nauki
    Artykuł
      Wyświetlanie 1-10 z 10

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