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    Wyświetlanie 1-8 z 8
    Tytuł:
    Actia maksymovi Mesn. (Tachinidae, Dipt.) nowy dla fauny polski pasożyt zwójek modrzewiowych (Tortricidae, Lep.)
    Actia maksymovi Mesn. (Tachinidae, Dipt.) novyjj dlja fauny Polshi parazit listvenichnojj listovertki (Tortricidae, Lep.)
    Actia maksymovi Mesn. (Tachinidae, Dipt.), new fort the fauna of Poland parasite of larch moths (Tortricidae, Lep.)
    Autorzy:
    Karczewski, J.
    Powiązania:
    https://bibliotekanauki.pl/articles/825358.pdf
    Data publikacji:
    1975
    Wydawca:
    Polskie Towarzystwo Leśne
    Źródło:
    Sylwan; 1975, 119, 04
    0039-7660
    Pojawia się w:
    Sylwan
    Dostawca treści:
    Biblioteka Nauki
    Artykuł
    Tytuł:
    Modern finite volume methods solving internal flow problems
    Autorzy:
    Kozel, K.
    Fořt, J.
    Powiązania:
    https://bibliotekanauki.pl/articles/1986689.pdf
    Data publikacji:
    2002
    Wydawca:
    Politechnika Gdańska
    Tematy:
    finite volumes
    modern numerical schemes
    internal aerodynamics
    Opis:
    The lecture deals with explicit and implicit finite difference and mainly finite volume schemes that have been commonly used in last years for compressible and incompressible fluid flow problems. Mainly we mention schemes used for transonic flow computation (inviscid as well as viscous models) in internal and also external aerodynamics. We prefer modern schemes like RK multistage schemes, TVD and ENO schemes, implicit schemes or higher order schemes. Some results of numerical computation or numerical simulation are presented in the second part of the paper, including 2D and 3D transonic flow through a channel and a cascade (mainly of turbine type), 2D and 3D backward facing step flow (laminar and turbulent), 2D and 3D impinging jet flow (comparisons of some turbulent models). The last two cases have been computed only for incompressible viscous flows. Some tests for the efficiency of higher order scheme (4th-6th order) are presented for the backward facing step problem. In many examples we also present a comparison of numerical and experimental results.
    Źródło:
    TASK Quarterly. Scientific Bulletin of Academic Computer Centre in Gdansk; 2002, 6, 1; 127-142
    1428-6394
    Pojawia się w:
    TASK Quarterly. Scientific Bulletin of Academic Computer Centre in Gdansk
    Dostawca treści:
    Biblioteka Nauki
    Artykuł
    Tytuł:
    Koncepcja rewitalizacji Fortu Prusy na terenie Twierdzy Nysa
    Conception of revitalization of Prusy Fort in the area of Nysa Fortress
    Autorzy:
    Potyrała, J.
    Niedźwiecka-Filipiak, I.
    Powiązania:
    https://bibliotekanauki.pl/articles/1186116.pdf
    Data publikacji:
    2004
    Wydawca:
    Uniwersytet Przyrodniczy we Wrocławiu
    Tematy:
    Fort Prusy
    rewitalizacja
    Prusy Fort
    revitalization
    Opis:
    In works concerning revitalization of fortification objects appropriate management of "greens" is of great importance especially in the first phase of activities. Self-sown trees and bushes of various age, spontaneously sprout in the area of the fort. They visually distort the form of embankments, and their roots contribute to the destruction of walls. However such a green area which is dozens of years old becomes a habitat for many species of mammals and birds. In that case it is forbidden to destroy it rashly. Stipulation of conscious fortification's historical planting, defining the place of cutting down trees and bushes and places where the existing ecosystem is to be preserved, marking up sightseeing routes and determining functions for particular fortification objects are assignments to be done at the very beginning in the area of Prusy fort.
    Źródło:
    Architektura Krajobrazu; 2004, 1-2; 14-21
    1641-5159
    Pojawia się w:
    Architektura Krajobrazu
    Dostawca treści:
    Biblioteka Nauki
    Artykuł
    Tytuł:
    Harmonic currents of frequency converters with voltage source inverters
    Prądy harmoniczne przetworników częstotliwości z przekształtnikami typu źródła napięciowego
    Autorzy:
    Kus, V.
    Drabek, P.
    Fort, J.
    Pittermann, M.
    Powiązania:
    https://bibliotekanauki.pl/articles/159942.pdf
    Data publikacji:
    2006
    Wydawca:
    Sieć Badawcza Łukasiewicz - Instytut Elektrotechniki
    Tematy:
    przekształtnik
    prąd harmoniczny
    obliczanie prądów harmonicznych
    voltage source inverters
    calculation of harmonic currents
    Opis:
    Using of well-known "1 over h rule" is not sufficient for harmonic current calculation because harmonic values are much bigger and it is necessary to modify results. Therefore so-called "Modified 1 over h rule" is presented. Converter properties on taken harmonic currents are described further. Partly there are properties of design topology and converter component parameters, which user cannot influence. And there are properties of additional devices as well, which are offered with converters and positively influence (decrease) taken harmonic currents. At voltage inverters power factor is very different from power factor (p. f.) by influence of taken current. Harmonic current experimental results of converters with voltage source inverter are compared at the close.
    Użycie znanej reguły "1nad h" nie wystarcza dla obliczania prądów harmonicznych, ponieważ wartości harmoniczne są dużo wyższe i wyniki muszą być modyfikowane. Dlatego przedstawiono regułę "Modyfikowane 1 nad h". W artykule opisano własności przetworników dotyczące topologii i parametrów elementów przetwornika, na które użytkownik nie ma wpływu. Omówiono własności dodatkowych przyrządów, które są oferowane wraz z przetwornikami i wpływają pozytywnie obniżając pobierane prądy harmoniczne. W przekształtnikach napięcia współczynnik mocy różni się znacznie pod wpływem pobieranego prądu. Porównano eksperymentalne wyniki przetworników z przekształtnikami typu źródła napięcia.
    Źródło:
    Prace Instytutu Elektrotechniki; 2006, 229; 47-58
    0032-6216
    Pojawia się w:
    Prace Instytutu Elektrotechniki
    Dostawca treści:
    Biblioteka Nauki
    Artykuł
    Tytuł:
    Rozpoznanie konserwatorskie wartości architektonicznych, krajobrazowych i kulturowych kleszczowego Fortu Prusy w Nysie
    Conservation Recognition of the Architectural, Landscape and Cultural Values of the Tenaille Fort Prusy in Nysa
    Autorzy:
    Potyrała, J.
    Powiązania:
    https://bibliotekanauki.pl/articles/1187404.pdf
    Data publikacji:
    2010
    Wydawca:
    Uniwersytet Przyrodniczy we Wrocławiu
    Tematy:
    rozpoznanie konserwatorskie
    architektura
    krajobraz
    kultura
    Nysa
    conservation recognition
    architecture
    landscape
    culture
    Opis:
    The fort "Prusy "is an impressive for its size citadel of the Nysa fortress of the 18th century. Rarely met in other parts of our country the tenaille trace works of the major fortifications of the defensive work and a good status of preservation, even the eighteenth century fort elements qualify it to take under the special protection. The centre of the defence setting-up of the Fort Prusy is a five-pointed star surrounded by a dry main moat. Behind it is a ring of ravelins and counterguards. From the outside, the second dry moat with the shaft on counterscarp runs and only on fragments preserved by a hidden road. In the north, before the ravelin Pomorze are the remains of flashes Diericke. In the southern part run two connecting shafts to the Bombardier Fort and External Jerusalem Ramparts. The construction of the fort which was started in 1 743 was completed in 1745, then it was expanded and modernized several times, until the eighties of the nineteenth century. Built to defend and deter, raw in its military function was patinated over time. Although the sun, water, and further green significantly deformed its historical form it arouses admiration and interest for its creators. On one hand, today we would like to see ravelins, salients and counterguards in their original form, and even live staging of the historic battle on their reconstructed slopes. On the other hand, the invasive green-clad fortress attracts us with its mystery, it becomes a place of rest, not only to commune with history, but also with nature. The area of the fort is also an excellent training ground for teaching of students the development of conservation plans and implementation of project work, where the space formed with a human hand is filled with green areas with large natural and landscape values, but also with green threatening the structure of walls and slopes. The author has made an important substantive contribution to the preparation of materials which enable to enter the facility in the register of monuments.
    Źródło:
    Architektura Krajobrazu; 2010, 3; 20-34
    1641-5159
    Pojawia się w:
    Architektura Krajobrazu
    Dostawca treści:
    Biblioteka Nauki
    Artykuł
    Tytuł:
    A study of CFD simulations of the flow pattern in an agitated system with a pitched blade worn turbine
    Autorzy:
    Skocilas, J.
    Fort, I.
    Jirout, T.
    Powiązania:
    https://bibliotekanauki.pl/articles/185244.pdf
    Data publikacji:
    2013
    Wydawca:
    Polska Akademia Nauk. Czytelnia Czasopism PAN
    Tematy:
    pitched blade impeller
    erosion wear
    ensemble-average mean velocity
    impeller
    pumping capacity
    CFD simulation
    prędkość uśredniona
    wirnik
    wydajność pompy
    symulacji CFD
    Opis:
    This paper presents a numerical analysis of an agitated fully baffled cylindrical vessel with a down pumping four blade worn or unworn pitched blade impeller (= 45[degrees] and 30[degrees]) under a turbulent flow regime. CFD simulations predict the pumping capacity of the system equipped by worn and unworn pitched blade impeller. Experimental data were taken from the authors’ previous work and compared with results of numerical computations. A good agreement with experimental data was obtained. The ensemble-average mean velocity field with worn and unworn impellers was computed. It follows from the simulation results that the wear rate of the impeller blade has a significantly negative effect on the velocity distribution in an agitated liquid. The greater the destruction of the worn blade, the higher is the deformation of the velocity field around the rotating impeller, with a simultaneous decrease in impeller pumping capacity.
    Źródło:
    Chemical and Process Engineering; 2013, 34, 1; 39-49
    0208-6425
    2300-1925
    Pojawia się w:
    Chemical and Process Engineering
    Dostawca treści:
    Biblioteka Nauki
    Artykuł
    Tytuł:
    Pochodzenie kamienia użytego do budowy wybranych twierdz na Dolnym Śląsku
    Origin of Stone Used to Build Selected Fortresses in Lower Silesia
    Autorzy:
    Lorenc, M. W.
    Potyrała, J.
    Powiązania:
    https://bibliotekanauki.pl/articles/1189780.pdf
    Data publikacji:
    2013
    Wydawca:
    Uniwersytet Przyrodniczy we Wrocławiu
    Tematy:
    twierdza
    fort
    kamień
    Srebrna Góra
    Nysa
    fortress
    stone
    Opis:
    A variety of rock material was used to build the walls of the Fortress in Srebrna Góra (Silver Mountain). Most of it was fine-grain laminated gneisses and mica slates quarried on site. The entrance to casemates and the frames of merlons and all corners, edges, and rain-pipes were made from beige or grey and beige sandstone from Radków or red-coloured sandstone from Czerwieńczyce. A detailed analysis of the stone material found within the entire fort showed, that though it varies somewhat in terms of colour, the petrographic features are represented by three types of rock: granites, gneisses, and sandstones. The basic material used for the construction of walls included fine-grained biotite granites from the Maciejowice, Malerzowice, and Starowice regions and also leucogranites and aplites from the Jarnołtów, Nadziejów, and Kamienna Góra regions. In addition to these rocks, fine-grained gneisses were also quarried and used that were part of the cover of xenoliths. Lightyellow sandstones from the Żelazno area in the Kłodzko Valley were most probably used for building window frames and vents.
    Źródło:
    Architektura Krajobrazu; 2013, 4; 4-17
    1641-5159
    Pojawia się w:
    Architektura Krajobrazu
    Dostawca treści:
    Biblioteka Nauki
    Artykuł
    Tytuł:
    Study of the turbulent flow structure around a standard Rushton impeller
    Autorzy:
    Kysela, B.
    Konfršt, J.
    Fořt, I.
    Kotek, M.
    Chára, Z.
    Powiązania:
    https://bibliotekanauki.pl/articles/184917.pdf
    Data publikacji:
    2014
    Wydawca:
    Polska Akademia Nauk. Czytelnia Czasopism PAN
    Tematy:
    Rushton turbine
    mixing, ensemble-average mean velocity
    fluctuation velocity
    LDA/LDV
    PIV
    velocity profiles
    turbina Rushtona
    mieszanie
    wahanie prędkości
    PRA / LDV
    profil prędkości
    Opis:
    The velocity field around the standard Rushton turbine was investigated by the Laser Doppler Anemometry (LDA) and Particle Image Velocime try (PIV) measurements. The mean ensemble-averaged velocity profiles and root mean square values of fluctuations were evaluated at two different regions. The first one was in the discharge stream in the radial direction from the impeller where the radial flow is dominant and it is commonly modelled as a swirling turbulent jet. The validity range of the turbulent jet model was studied. The second evaluated region is under the impeller where flow seems to be at first sight rather rigorous but obtained results show nonnegligible values of fluctuation velocity.
    Źródło:
    Chemical and Process Engineering; 2014, 35, 1; 137-147
    0208-6425
    2300-1925
    Pojawia się w:
    Chemical and Process Engineering
    Dostawca treści:
    Biblioteka Nauki
    Artykuł
      Wyświetlanie 1-8 z 8

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