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    Wyświetlanie 1-7 z 7
    Tytuł:
    Wyznaczenie naprężeń normalnych w przekrojach komina żelbetowego czteroprzewodowego
    The determination of normal stresses in cross-section of the four-flue reinforced concrete chimney
    Autorzy:
    Borzęcki, K.
    Słowik, M.
    Powiązania:
    https://bibliotekanauki.pl/articles/390306.pdf
    Data publikacji:
    2008
    Wydawca:
    Politechnika Lubelska. Wydawnictwo Politechniki Lubelskiej
    Tematy:
    normal stresses
    reinforced concrete chimney
    full cross-section
    cross section weakened by openings
    Opis:
    W niniejszej pracy zaprezentowano analityczny sposób wyznaczenia naprężeń w kominie czteroprzewodowym o przekroju złożonym z wycinków pierścieni. Przeanalizowano cztery modele obliczeniowe komina: układ przewodów pełny i z otworami ustawiony na kształt rombu w stosunku do przepływu wiatru oraz układ przewodów pełny i z otworami ustawiony na kształt kwadratu w stosunku do przepływu wiatru. Przy wykonywaniu obliczeń wykorzystano prace M. Lachmana [1] i [2], w których podane są dane wyjściowe do obliczeń kominów wieloprzewodowych.
    In the paper the way of calculation of compressive stresses in the cross-section of a four-flue reinforced concrete chimney has been presented. Two types of cross section have been considered: the full cross section and the cross section weakened by openings. The analysis described in the paper refers to the chimney arrangement in diamond shape in relation to wind flow.
    Źródło:
    Budownictwo i Architektura; 2008, 3, 2; 97-118
    1899-0665
    Pojawia się w:
    Budownictwo i Architektura
    Dostawca treści:
    Biblioteka Nauki
    Artykuł
    Tytuł:
    Projektowanie żelbetowych kominów przemysłowych wieloprzewodowych
    Dimensioning of reinforced concrete multi - flue chimneys
    Autorzy:
    Słowik, M.
    Dobrowolska, M.
    Borzęcki, K.
    Powiązania:
    https://bibliotekanauki.pl/articles/390334.pdf
    Data publikacji:
    2008
    Wydawca:
    Politechnika Lubelska. Wydawnictwo Politechniki Lubelskiej
    Tematy:
    konstrukcje żelbetowe
    kominy przemysłowe wieloprzewodowe
    reinforced concrete structures
    industrial multi-flue chimneys
    Opis:
    W artykule opisano zagadnienia związane z projektowaniem żelbetowych kominów przemysłowych wieloprzewodowych o złożonych kształcie przekroju, które nie są ujęte w przepisach normowych. Dokonano również przeglądu różnych koncepcji kształtowania przekroju kominów wieloprzewodowych, ze szczególnym uwzględnieniem kominów trzy i czteroprzewodowych. Artykuł jest wzbogacony o przykłady żelbetowych kominów tego typu zrealizowanych w Polsce.
    In the paper there are presented the basic principles of dimensioning of reinforced concrete multi-flue industrial chimneys. The calculation problems appear when the cross section is more complicated than simple annular one, for which there are rules in the code. Different concepts of multi-flue chimneys, especially three-flue and four-flue chimneys, are described and the examples of industrial chimneys built in Poland are given as well.
    Źródło:
    Budownictwo i Architektura; 2008, 3, 2; 71-80
    1899-0665
    Pojawia się w:
    Budownictwo i Architektura
    Dostawca treści:
    Biblioteka Nauki
    Artykuł
    Tytuł:
    Przestrzenne rozmieszczenie odpadów drzewnych w Europie
    Spatial distribution of wood waste in Europe
    Autorzy:
    Borzecki, K.
    Pudełko, R.
    Kozak, M.
    Borzecka, M.
    Faber, A.
    Powiązania:
    https://bibliotekanauki.pl/articles/986683.pdf
    Data publikacji:
    2018
    Wydawca:
    Polskie Towarzystwo Leśne
    Tematy:
    biomasa
    odpady drzewne
    rozmieszczenie przestrzenne
    Europa
    biomass
    wood waste
    wood waste management
    spatial modeling
    Opis:
    Wood waste in Europe is produced on a large scale. Production from all 28 European Union countries accounts for around 50.2 Mt. In many countries, wood waste management does not fully utilize this potential, which is in part due to the lack of proper law and regulations. Currently there is no uniform policy on wood waste in the European Union. There is also a lack of accurate statistics on the production and use of this waste. The aim of the study was to estimate the spatial distribution of wood waste from three different sources in the NUTS−2 regions. The total potential of wood waste from i) municipal waste is 24.33 Mt, ii) from wood industry – 5.6 Mt, and iii) from demolition and construction – 19.17 Mt. The total potential of this waste is about 7,85% of estimated waste biomass and by−products of the European Union, which is a significant fraction that can be recycled or used in biofuel production. Proper use of this potential can have a significant impact on the development of the bio−economy sector in all associated countries, which directly translates into the achievement of climate change mitigation targets.
    Źródło:
    Sylwan; 2018, 162, 07; 563-571
    0039-7660
    Pojawia się w:
    Sylwan
    Dostawca treści:
    Biblioteka Nauki
    Artykuł
    Tytuł:
    What-if analysis of the labyrinth seal of the gas turbine rotor tip
    Autorzy:
    Wróblewski, W.
    Bochon, K.
    Borzęcki, T.
    Powiązania:
    https://bibliotekanauki.pl/articles/175228.pdf
    Data publikacji:
    2017
    Wydawca:
    Polska Akademia Nauk. Czytelnia Czasopism PAN
    Tematy:
    gas turbine
    labyrinth seal
    honeycomb
    CFD
    Opis:
    This paper presents a preliminary, numerical what-if analysis of selected geometrical parameters of the tip seal of the last stage of an aircraft engine turbine and the impact of the parameters on the leakage mass ow. The analysis is a part of the task of improving the rotor tip seal conguration in aircraft turbines. Calculations were carried out using the commercial computational uid dynamics code. A straight-through seal with two leaning ns and a honeycomb land was analysed. The computational model was prepared based on some simplications introduced to improve the eciency of the calculations. The rotor entire blade-to-blade channel was analysed, while the seal pitch was reduced to the dimensions of two honeycomb cells. The geometry of the ns themselves was simplied too. In the original variant, the n tips had caps to protect them from wear (shape deformation) due to rubbing. In the simplied model, the caps were omitted. The simplications did not change the leakage mass ow signicantly. Several variants of changes in the basic geometrical parameters of the seal were analysed to assess their eect on the leakage mass ow for altered ow conditions. Parameters such as the n thickness, the n inclination angle and the position of the ns and of the entire labyrinth were analysed. The best seal variant was selected, the ow phenomena were commented on and some points in the design of this type of the labyrinth seal were discussed.
    Źródło:
    Transactions of the Institute of Fluid-Flow Machinery; 2017, 136; 3-21
    0079-3205
    Pojawia się w:
    Transactions of the Institute of Fluid-Flow Machinery
    Dostawca treści:
    Biblioteka Nauki
    Artykuł
    Tytuł:
    CFD code - a useful tool for the turbomachinery designer
    Autorzy:
    Chodkiewicz, R.
    Sobczak, K.
    Papierski, A.
    Borzecki, T.
    Powiązania:
    https://bibliotekanauki.pl/articles/1931600.pdf
    Data publikacji:
    2002
    Wydawca:
    Politechnika Gdańska
    Tematy:
    CFD
    radial compressor
    radial pump
    axial flow turbine
    Opis:
    The presentation of CFX-TASCflow code possibilities for the turbomachinery design is the main aim of this study. In the first part of the work the compressor design process is presented. Next, CFX-TASCflow possibilities in predicting unstable operating conditions (surge) are shown. The one-stage, radial blower installed in the Institute of Turbomachinery TU of Lodz has been chosen owing to the available numerous experimental data. The pump calculations discussed in the third part concern a comparison of different turbulence models with the experimental results. In the last part devoted to the turbine design, the code usefulness is proved on the examples of the last stage design process.
    Źródło:
    TASK Quarterly. Scientific Bulletin of Academic Computer Centre in Gdansk; 2002, 6, 4; 553-575
    1428-6394
    Pojawia się w:
    TASK Quarterly. Scientific Bulletin of Academic Computer Centre in Gdansk
    Dostawca treści:
    Biblioteka Nauki
    Artykuł
    Tytuł:
    Prolonged exposure to transdermal nicotine improves memory in male mice, but impairs biochemical parameters in male and female mice
    Autorzy:
    Nieradko-Iwanicka, B.
    Pietraszek, D.
    Pośnik, K.
    Borzecki, A.
    Powiązania:
    https://bibliotekanauki.pl/articles/2082061.pdf
    Data publikacji:
    2018
    Wydawca:
    Instytut Medycyny Wsi
    Tematy:
    memory
    biochemical parameters
    nicotine
    Opis:
    Introduction. Nicotine is an alkaloid that affects the functioning of the central nervous system and produces dependence. In low doses, it acts as a stimulant and relaxant. Nicotine was reported to have pro-cognitive effects in humans and animals. However, high doses of nicotine are harmful for many organs.The aim of the study was to check whether a 30-day exposure to transdermal nicotine affects memory and biochemical parameters in mice. Materials and method. A total of 32 mice (16 males and 16 females) were used in the experiment. Mice were divided into 4 groups of 8 animals each: I control-females receiving placebo patches for 30 days, II females receiving nicotine patches for 30 days, III control-males receiving placebo patches, IV males receiving nicotine patches. Spontaneous alternation and locomotor activity were examined weekly in a Y-maze. Body mass was recorded daily. On day 30, venous blood samples were obtained and the animals were anaesthetized with CO2. Their blood was used to measure alanine transaminase (ALT), asparagine transaminase (AST), cholesterol, creatinine and glycosylated haemoglobin (HbA1C). Results. Nicotine significantly improved memory in male mice on day 8. It increased ALT and AST activities in males and females, as well as the concentration of cholesterol in their blood sera. Conclusions. In conclusion, transdermal nicotine may produce transient improvement in fresh spatial memory in male mice, but it is not a long-term effect and therefore nicotine does not seem to be appropriate for use in the treatment of neurodegenerative disorders. It elevates blood cholesterol level and thus may increase the risk of atherosclerosis and cardiovascular events; moreover, it negatively affects liver enzymes. Nicotine use is therefore not recommended.
    Źródło:
    Annals of Agricultural and Environmental Medicine; 2019, 26, 1; 62-66
    1232-1966
    Pojawia się w:
    Annals of Agricultural and Environmental Medicine
    Dostawca treści:
    Biblioteka Nauki
    Artykuł
    Tytuł:
    Skin lesions in humans bitten by European pigeon tick Argas reflexus (Fab.) (Ixodida: Argasidae) massively occurring in the Upper Silesian conurbation of south-west Poland
    Autorzy:
    Buczek, A.
    Bartosik, K.
    Kulina, D.
    Raszewska-Famielec, R.
    Borzecki, A.
    Powiązania:
    https://bibliotekanauki.pl/articles/2081662.pdf
    Data publikacji:
    2018
    Wydawca:
    Instytut Medycyny Wsi
    Tematy:
    Public Health
    skin lesions
    urban environment
    Argas reflexus
    European pigeon tick
    pests
    Opis:
    Introduction and objective. The great number of pigeon populations in many European cities promotes the spread of the European pigeon tick (Argas reflexus), the bites of which cause local and systemic reactions. The aim was to study the occurrence of A. reflexus in several cities of Upper Silesia, and skin lesions caused by A. reflexus tick bites in humans. Materials and method. The results of investigations carried out in 1995–2002 in five cities located in the Upper Silesian conurbation are presented. Specimens of A. reflexus were collected for one hour in attics and lofts inhabited by these ticks. A history of skin lesions caused by bites was taken from residents who had been infested by A. reflexus. The development of skin lesions was monitored for three months in two individuals who had been bitten several times by these arthropods. Results. In the localities, 987 A. reflexus specimens were collected, including 334 females, 269 males, and 384 various nymphal stages. Within one hour, 38–109 ticks specimens were collected at the study sites. Cases of attacks by unengorged A. reflexus were reported in all the habitats located in the residential buildings; the ticks were also found in residents’ flats and in staircases. Residents who had been repeatedly attacked by European pigeon ticks developed a strong inflammatory reaction to the components of tick saliva, and had purple papules with necrosis in the centre of the lesion. The tick bite areas exhibited scars and hyperpigmentation. Conclusions. Individuals attacked by A. reflexus several times are at risk of development of severe persistent local reactions to bites. Pigeon ticks, trophically associated with pigeons present abundantly in the Upper Silesian conurbation and other European urban habitats, pose a serious threat to public health.
    Źródło:
    Annals of Agricultural and Environmental Medicine; 2018, 25, 2; 234-240
    1232-1966
    Pojawia się w:
    Annals of Agricultural and Environmental Medicine
    Dostawca treści:
    Biblioteka Nauki
    Artykuł
      Wyświetlanie 1-7 z 7

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