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    Wyświetlanie 1-9 z 9
    Tytuł:
    Badania nad mechanizmami działania laktozy na jelitowy transport fosforanów
    Issledovanie mekhanizma dejjstvija laktozy na kishechnoe vsasyvanie fosfatov
    Studies on the mechanisms of lactose action on intestinal transport of phosphates
    Autorzy:
    Wasilewska, H.
    Staniszewska-Borkowska, J.
    Poniatowski, L.
    Lorenc, R.
    Powiązania:
    https://bibliotekanauki.pl/articles/2188340.pdf
    Data publikacji:
    1980
    Wydawca:
    Polskie Towarzystwo Diagnostyki Laboratoryjnej
    Źródło:
    Diagnostyka Laboratoryjna; 1980, 16, 1; 47-52
    0867-4043
    Pojawia się w:
    Diagnostyka Laboratoryjna
    Dostawca treści:
    Biblioteka Nauki
    Artykuł
    Tytuł:
    Review of possibilities of increasing the thickness of an anti-wear coating on piston rings by using specifically designed physical vapour deposition process
    Autorzy:
    Skorupa, P.
    Kaźmierczak, A.
    Błasiński, T.
    Borkowska, J.
    Krakowian, K.
    Łoza, Ł.
    Powiązania:
    https://bibliotekanauki.pl/articles/245017.pdf
    Data publikacji:
    2015
    Wydawca:
    Instytut Techniczny Wojsk Lotniczych
    Tematy:
    coatings
    anti-wear
    internal combustion engine
    PVD
    CVD
    thickness
    DLC
    Opis:
    The super-hard, anti-wear amorphic coatings based on carbon-like diamond (called DLC) show a promising direction in automotive industry, mainly in terms of decreasing friction coefficient in parts of internal combustion engine. However, the technology of producing DLC-coated parts, which is most often chemical vapour deposition (CVD) or physical vapour deposition (PVD) is proven to be still not perfect for achieving desired characteristics of the coating. The thickness of a coating is the main issue one should strive to improve, as the PVD methods produce films as thin as few micrometres. In such case, the coating is not only exposed to cracking, but also pitting is possible to happen. This is proven to be highly undesirable and unacceptable for this process. In addition, in case of thin films, the adhesion to the base is often too weak, despite the coating itself being extremely durable and hard. In this article, a theoretical ways to improve the process of coating are presented. The process itself is described, the achievable parameters are defined and the possible improvements are stated. The research made for the purpose of this article will be further exploited to design a process allowing creating the coating for testing of the best possible characteristics.
    Źródło:
    Journal of KONES; 2015, 22, 4; 281-286
    1231-4005
    2354-0133
    Pojawia się w:
    Journal of KONES
    Dostawca treści:
    Biblioteka Nauki
    Artykuł
    Tytuł:
    Various designs of the two-stroke engine heads with the valve flushed system
    Autorzy:
    Łoza, Ł.
    Kaźmierczak, A.
    Borkowska, J.
    Skorupa, P.
    Krakowian, K.
    Cienciała, M.
    Powiązania:
    https://bibliotekanauki.pl/articles/242546.pdf
    Data publikacji:
    2015
    Wydawca:
    Instytut Techniczny Wojsk Lotniczych
    Tematy:
    engine
    two-stroke
    internal combustion
    valve flushed system
    piston-controlled cam
    high petrol consumption
    oil in the petrol
    toxic by-products
    loud noise
    uneven running
    low efficiency
    Opis:
    The two-stroke engines have never acquired the popularity of the four-stroke engines due to their inherent performance limitations. The tasks of many engineering teams were to find the basic causes, which resulted in the inferior performance of these engines. Today’s task is to build a two-stroke engine whose performance could match that of a four-stroke engine in areas of common use. The most typical performance problems of a two-stroke engine are high petrol consumption caused by low efficiency, toxic by-products of combustion being emitted into the atmosphere (caused by oil present in the petrol), and uneven and loud engine noise. The greatest challenge is to achieve a good chamber purge during one stroke in which the fresh fuel mixture flows through the piston-controlled inlet port while at the same time the fumes are being exhausted through the outlet port. This in contrast with the four-stroke engines where the intake and exhaust are each done with two separate strokes. From the energy point of view, the two-stroke engine is not efficient because a certain amount of fresh fuel is being wasted in the exhaust fumes. We propose to replace the piston-controlled cam with the valve-flushed system, which will cause the combustion process to become more efficient. The purpose of this paper is to present various designs of the engine heads and analyse their performance. The goal of this proposal is to choose the best combination of these engine heads in order to achieve the optimum overall engine performance.
    Źródło:
    Journal of KONES; 2015, 22, 4; 187-190
    1231-4005
    2354-0133
    Pojawia się w:
    Journal of KONES
    Dostawca treści:
    Biblioteka Nauki
    Artykuł
    Tytuł:
    Experimental Determination of the Autocorrelation Function of Level Velocities for Microwave Networks Simulating Quantum Graphs
    Autorzy:
    Ławniczak, M.
    Borkowska, A.
    Hul, O.
    Bauch, S.
    Sirko, L.
    Powiązania:
    https://bibliotekanauki.pl/articles/1492514.pdf
    Data publikacji:
    2011-12
    Wydawca:
    Polska Akademia Nauk. Instytut Fizyki PAN
    Tematy:
    05.45.Mt
    03.65.Nk
    Opis:
    The autocorrelation function c(x) of level velocities is studied experimentally. The measurements were performed for microwave networks simulating quantum graphs. One and two ports measurements of the scattering matrix Ŝ necessary for determining c(x) were realized for the networks possessing 5 and 6 vertices, respectively. The network with six vertices was fully connected. In the case of the networks with five vertices, additionally to the fully connected configuration, we measured the networks without the bond connecting input/output vertices. The obtained experimental results besides the autocorrelation function of level velocities, also the nearest-neighbor spacing distribution and parametric velocities distribution are compared to the predictions of random matrix theory and numerical results.
    Źródło:
    Acta Physica Polonica A; 2011, 120, 6A; A-185-A-190
    0587-4246
    1898-794X
    Pojawia się w:
    Acta Physica Polonica A
    Dostawca treści:
    Biblioteka Nauki
    Artykuł
    Tytuł:
    Dynamika populacji Genistella sagittalis (L.) Gams in Hegi w Puszczy Kozienickiej w okresie 1997-2007
    Dynamics of Genistella sagittalis [L.] Gams in Hegi population in the Kozienicka Primeval Forest in the period of 1997-2007
    Autorzy:
    Krechowski, J.
    Piórek, K.
    Borkowska, L.
    Powiązania:
    https://bibliotekanauki.pl/articles/1012831.pdf
    Data publikacji:
    2008
    Wydawca:
    Polskie Towarzystwo Leśne
    Tematy:
    Puszcza Kozienicka
    dynamika populacji
    Genistella sagittalis
    lesnictwo
    janowczyk skrzydlaty
    krzewy
    genistella sagittalis
    kozienicka primeval forest
    population dynamics
    Opis:
    A new stand of rare in the Polish flora subshrub of Fabaceae family − Genistella sagittalis was recorded in 1997 in the area of Kozienicki Landscape Park and subjected to monitoring. The analysis covers the observation period from 1997 to 2007. On the basis of phytosociological relevés a negative effect of such factors as undergrowth overshading and interspecies competition on condition of Genistella sagittalis population was stated. The species demonstrates expansive tendencies in insolated habitats of little undergrowth cover. The population seems to be stabile and is not endangered at present.
    Źródło:
    Sylwan; 2008, 152, 07; 67-72
    0039-7660
    Pojawia się w:
    Sylwan
    Dostawca treści:
    Biblioteka Nauki
    Artykuł
    Tytuł:
    Zmiany w szacie roślinnej rezerwatu Grąd Radziwiłłowski (Wysoczyzna Drohiczyńska) w latach 1971−2008
    Changes in the vegetation of the Grad Radziwillowski nature reserve [Drohiczynska Upland] between 1971 and 2008
    Autorzy:
    Ciosek, M.T.
    Chursowicz, B.
    Borkowska, L.
    Powiązania:
    https://bibliotekanauki.pl/articles/1009206.pdf
    Data publikacji:
    2010
    Wydawca:
    Polskie Towarzystwo Leśne
    Tematy:
    lesnictwo
    rezerwaty przyrody
    rezerwat Grad Radziwillowski
    fitosocjologia
    zbiorowiska roslinne
    flora
    zmiany skladu gatunkowego
    dynamics of forest stand
    succession
    quantitative and qualitative proportions of the flora
    southern podlasie region
    drohiczyńska upland.
    Opis:
    Studies on changes in the vegetation of the Grąd Radziwiłłowski nature reserve were carried out between 2005 and 2008. The nature reserve is situated in the southern part of the Podlasie region, near Radziwiłłówka village (Mielnik county). The results were compared with the research conducted by Sokołowski in 1971 and 1989 [Sokołowski 1993] and with data from establishment statement of the nature reserve. Structure and physiognomy of the forest stand as well as quantitative and qualitative proportions in the flora have changed in the studied period. The vegetation of the reserve ought to be monitored.
    Źródło:
    Sylwan; 2010, 154, 04; 275-281
    0039-7660
    Pojawia się w:
    Sylwan
    Dostawca treści:
    Biblioteka Nauki
    Artykuł
    Tytuł:
    Patterns of seedling recruitment in experimental gaps on mosaic vegetation of abandoned meadows
    Autorzy:
    Borkowska, L
    Powiązania:
    https://bibliotekanauki.pl/articles/58798.pdf
    Data publikacji:
    2004
    Wydawca:
    Polskie Towarzystwo Botaniczne
    Tematy:
    Salix cinerea
    meadow area
    Carex acutiformis
    botany
    seedling
    seedling appearance
    Bialowieza National Park
    Carex cespitosa
    Opis:
    The paper presents results of a study on the response of species growing in experimental gaps in the patches dominated by Carex acutiformis, C. cespitosa and Salix cinerea. The study was performed in a meadow area subjected to the process of succession in the Reski Range in the Białowieski National Park. Four patterns of seedlings recruitment in the experimental gaps were distinguished: pattern I - great number of seedlings with high richness of species, pattern II - great number of seedlings with low richness of species, pattern III - low number of seedlings with great richness of species and pattern IV - low number of seedlings with low richness of species.
    Źródło:
    Acta Societatis Botanicorum Poloniae; 2004, 73, 4
    0001-6977
    2083-9480
    Pojawia się w:
    Acta Societatis Botanicorum Poloniae
    Dostawca treści:
    Biblioteka Nauki
    Artykuł
    Tytuł:
    Szata roślinna rezerwatu "Śnieżyczki" (Nizina Południowopodlaska)
    Vegetation of the "Sniezyczki" nature reserve (Poludniowopodlaska Lowland)
    Autorzy:
    Borkowska, L.
    Nowicka-Falkowska, K.
    Piórek, K.
    Trębicka, A.
    Powiązania:
    https://bibliotekanauki.pl/articles/996027.pdf
    Data publikacji:
    2012
    Wydawca:
    Polskie Towarzystwo Leśne
    Tematy:
    Nizina Poludniowopodlaska
    rezerwaty przyrody
    rezerwaty florystyczne
    rezerwat Sniezyczki
    flora
    rosliny naczyniowe
    gatunki chronione
    gatunki zagrozone
    sniezyczka przebisnieg
    Galanthus nivalis
    zbiorowiska roslinne
    grad subkontynentalny
    zespol Tilio-Carpinetum
    nature reserve
    tilio cordatae−carpinetum betuli
    galanthus nivalis
    vegetation
    Opis:
    ‘Śnieżyczki’ nature reserve (E Poland) is characterised by forest ecosystems only, represented by the Mazovian variety of the subcontinent lime−oak−hornbeam forest Tilio cordatae−Carpinetum betuli and stachys lime−oak−hornbeam forest Tilio cordatae−Carpinetum betuli stachyetosum – a rarity on the regional scale – which represents the wettest and the most fertile kind of lime−oak−hornbeam forests, and whose species composition and structure is similar to those of riparian forests. The vascular flora of the reserve includes 119 species. The rich locality of Galanthus nivalis, situated in the forest complex of Sokołów Podlaski Forest District – which is the most north−eastward point of its natural range – is a flora curiosity.
    Źródło:
    Sylwan; 2012, 156, 01; 64-71
    0039-7660
    Pojawia się w:
    Sylwan
    Dostawca treści:
    Biblioteka Nauki
    Artykuł
    Tytuł:
    The impact of the energy state of the surface of friction pairs on the friction and wear in internal combustion engines
    Autorzy:
    Borkowska, J.
    Kaźmierczak, A.
    Krakowian, K.
    Cienciała, M.
    Skorupa, P.
    Łoza, Ł.
    Powiązania:
    https://bibliotekanauki.pl/articles/245015.pdf
    Data publikacji:
    2015
    Wydawca:
    Instytut Techniczny Wojsk Lotniczych
    Tematy:
    friction pairs
    top layer of surface
    sealing function
    piston ring
    cylinder sleeve
    combustion engine
    tangential force
    friction coefficient
    molecular structure
    bond
    tribology
    Opis:
    The elements creating a friction pairs are described to be very difficult in terms of defining all optimal parameters in an unequivocal way. The research on stability of friction pairs is focused on the surface and the top layer of surface in the parts concerned. The main goal is to find new design solutions and materials, thereby achieving one million kilometers of mileage to main repair in the case of internal combustion engines. The biggest structural difficulties are noticeable in friction pairs where it can be observed sliding and returning motion, which is also connected with sealing function. A typical example of such pair is piston ring – cylinder sleeve in piston – rings - cylinder unit in an internal combustion engine. Engineers are currently seeking an additional factor, which would enable gaining the reduction of tangential force by reducing the friction coefficient in elements of friction pair during operations. The surface free energy may be such factor - it results from molecular structure and nature of the bonds between the molecules present in the material. Components of surface free energy determine the tribological properties of the material, which is reflected in the stability of the units. Energy state of the surface, which is connected with chemistry and characteristics in the material, is the first step to consider about the impact on wearing in internal combustion engine. This is the main topic of this article.
    Źródło:
    Journal of KONES; 2015, 22, 4; 37-41
    1231-4005
    2354-0133
    Pojawia się w:
    Journal of KONES
    Dostawca treści:
    Biblioteka Nauki
    Artykuł
      Wyświetlanie 1-9 z 9

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