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Wyszukujesz frazę "Cech, P." wg kryterium: Autor

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    Wyświetlanie 1-5 z 5
    Tytuł:
    Comparison of VOC emissions from natural (untreated) Poplar wood and heat treated wood
    Porównanie emisji lotnych związków organicznych LZO z naturalnego (nieprzetworzonego) drewna topoli oraz drewna poddanego obróbce cieplnej
    Autorzy:
    Cech, P.
    Tesarova, D.
    Powiązania:
    https://bibliotekanauki.pl/articles/8390.pdf
    Data publikacji:
    2015
    Wydawca:
    Szkoła Główna Gospodarstwa Wiejskiego w Warszawie. Wydawnictwo Szkoły Głównej Gospodarstwa Wiejskiego w Warszawie
    Źródło:
    Annals of Warsaw University of Life Sciences - SGGW. Forestry and Wood Technology; 2015, 90
    1898-5912
    Pojawia się w:
    Annals of Warsaw University of Life Sciences - SGGW. Forestry and Wood Technology
    Dostawca treści:
    Biblioteka Nauki
    Artykuł
    Tytuł:
    Physical activity and body composition of 5 to 7 years old children
    Autorzy:
    Junger, J.
    Palanska, A.
    Cech, P.
    Powiązania:
    https://bibliotekanauki.pl/articles/2052249.pdf
    Data publikacji:
    2014
    Wydawca:
    Akademia Bialska Nauk Stosowanych im. Jana Pawła II w Białej Podlaskiej
    Tematy:
    preschool child
    body composition
    physical activity
    obesity
    norms
    Opis:
    Current exercise prescription and physical activity guidelines recommend preschool children to perform at least 60 minutes of moderate to vigorous structured physical activity and at least 60 minutes of unstructured physical activity every day. The purpose of this study was to extend knowledge about the volume of physical activity in 5- to 7-year-old children in relation to their body composition. Also, we recorded the course of growth changes and physical activity levels in 6-year-old children in the previous half century. The sample consisted of 69 pre-school age children (5 - 7 years) attending selected kindergartens located in the area of Presov self-governing region. Of 69 children, 36 were girls and 33 were boys. The volume and intensity of physical activity performed by children during their stay in kindergartens was measured using heart rate monitoring system POLAR Team 2 Pro. Body composition was assessed using direct segmental multi-frequency bioelectric impedance analysis (DSM-BIA) device InBody 230. Parameters of somatic development corresponding with the secular trend are disproportionate to children’s physical activity, which is considered to be an irreplaceable factor underlying health of children. However, the physical activity levels of children are decreasing. The volume of physical activity does not meet the minimum standard recommended by NASPE (Prokopec et al. 1986) and average intensity of physical activity expressed by heart rate does not reach the medium intensity zone.
    Źródło:
    Health Problems of Civilization; 2014, 08, 3; 12-19
    2353-6942
    2354-0265
    Pojawia się w:
    Health Problems of Civilization
    Dostawca treści:
    Biblioteka Nauki
    Artykuł
    Tytuł:
    Experiments on additive desulphurisation by sodium bicarbonate in coal-fuel boiler
    Autorzy:
    Kolat, P.
    Cech, B.
    Vrtek, M.
    Tomasek, D.
    Powiązania:
    https://bibliotekanauki.pl/articles/185695.pdf
    Data publikacji:
    2013
    Wydawca:
    Polska Akademia Nauk. Czytelnia Czasopism PAN
    Tematy:
    combustion
    desulphurization
    pulverized
    bicarbonate
    spalanie
    odsiarczanie
    dwuwęglan
    Opis:
    This paper describes experiments on the application of sodium bicarbonate desulphurisation in the coal-fuel boiler. The boiler has been in operation for several years now and it has refiably fulfilled the original assignment to reduce SO2 emissions from the value of 1200 -1500 mg/Nm3 to 400 mg/Nm3. Higher desulphurisation efficiency is determined only by the ratio of Na/S sorbent dosage. The resulting product of desulphurisation is stored together with fly ash in underground mines, and has no influence on the groundwater. Positive experience of the tests and boiler operation lies in higher reactivity of sodium and sulphur as compared with conventional methods based on limestone. Within the scope of the secondary measures of elimination of sulphur oxides in combustion products, an experimental dry-method desulphurisation of combustion products was performed by blasting an agent containing sodium bicarbonate NaHCO3 (99.6 %) into the flue ways before the electrostatic precipitator in a coal-fuel furnace with the steam output of 220 t/h.
    Źródło:
    Chemical and Process Engineering; 2013, 34, 1; 77-86
    0208-6425
    2300-1925
    Pojawia się w:
    Chemical and Process Engineering
    Dostawca treści:
    Biblioteka Nauki
    Artykuł
    Tytuł:
    Prediction of the Mechanical Properties of Chrome-Nickel Austenitic Stainless Steels with Respect to their Chemical Composition
    Autorzy:
    Záděra, A.
    Maroš, B.
    Blažík, P.
    Čech, J.
    Kaňa, V.
    Powiązania:
    https://bibliotekanauki.pl/articles/379648.pdf
    Data publikacji:
    2018
    Wydawca:
    Polska Akademia Nauk. Czytelnia Czasopism PAN
    Tematy:
    austenitic steels
    planned experiment
    mechanical properties
    regression analysis
    stale austenityczne
    eksperyment
    właściwości mechaniczne
    analiza regresji
    Opis:
    The research was concerned with the influence of chemical composition of austenitic steels on their mechanical properties. Resulting properties of castings from austenitic steels are significantly influenced by the solidification time that affects the size of the primary grain as well as the layout of elements within the dendrite and its parts with regard to the last solidification points in the interdendritic melt. During solidification an intensive segregation of all admixtures occurs in the melt, which causes a whole range of serious metallurgical defects and it has also a significant influence on subsequent precipitation of carbides and intermetallic phases. Chemical heterogeneity then affects the structure and mechanical properties of the casting. In a planned experiment, we cast melted steels containing 18 to 28 % Cr and 8 to 28 % Ni with variable carbon and nitrogen contents. Testing the tensile strength of the cast specimens we could determine the Rp0.2, Rm, and A5 values. The dependence of the mechanical properties on the chemical content was described by regression equations. The planned experiment results allow us to control the chemical content for the given austenitic steel quality to achieve the required values of the mechanical properties.
    Źródło:
    Archives of Foundry Engineering; 2018, 18, 1; 217-221
    1897-3310
    2299-2944
    Pojawia się w:
    Archives of Foundry Engineering
    Dostawca treści:
    Biblioteka Nauki
    Artykuł
    Tytuł:
    Mechanical and Thermal Properties of Individual Phases Formed in Sintered Tungsten-Steel Composites
    Autorzy:
    Matějíček, J.
    Nevrlá, B.
    Čech, J.
    Vilémová, M.
    Klevarová, V.
    Haušild, P.
    Powiązania:
    https://bibliotekanauki.pl/articles/1402135.pdf
    Data publikacji:
    2015-10
    Wydawca:
    Polska Akademia Nauk. Instytut Fizyki PAN
    Tematy:
    62.20.-x
    65.40.-b
    Opis:
    Tungsten is a prime candidate material for plasma facing components in fusion devices, thanks to its advantageous properties with respect to interaction with hot plasma. For its bonding to the supporting structure, composites and graded layers can be used for the reduction of stress concentration at the interface. When tungsten and steel are processed at elevated temperatures, e.g. hot pressing or spark plasma sintering, intermetallic phases may form and their presence and properties will affect the properties of the composite. In this work, mechanical and thermal properties of the individual phases, i.e. steel, tungsten and Fe-W intermetallics are investigated. Mechanical properties were determined by instrumented indentation. Thermal conductivity was determined by the xenon flash method on a range of samples with varying composition, from which the conductivities of each constituent were estimated. The results can be used for the optimization of compositional profiles and processing conditions for manufacturing of plasma facing components.
    Źródło:
    Acta Physica Polonica A; 2015, 128, 4; 718-721
    0587-4246
    1898-794X
    Pojawia się w:
    Acta Physica Polonica A
    Dostawca treści:
    Biblioteka Nauki
    Artykuł
      Wyświetlanie 1-5 z 5

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