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    Wyświetlanie 1-5 z 5
    Tytuł:
    Cohort fertility of Polish women, 1945–2015: the context of postponement and recuperation
    Autorzy:
    Tymicki, Krzysztof
    Zeman, Krystof
    Holzer-Żelażewska, Dorota
    Powiązania:
    https://bibliotekanauki.pl/articles/1827653.pdf
    Data publikacji:
    2018-12-03
    Wydawca:
    Polska Akademia Nauk. Czytelnia Czasopism PAN
    Tematy:
    cohort and period fertility measures
    postponement
    recuperation
    Opis:
    The article is a follow-up and an extension to previously published papers by Holzer-Żelażewska & Holzer (1997) and Holzer-Żelażewska & Tymicki (2009). Fristly, we have added new cohorts to the cohort analysis based on the individual data from births registration for the years 2009–2015. Secondly, we have extended the scope of the study by taking into account the context of postponement and recuperation to analyses of cohort fertility of Polish women. The approach applied to the fertility postponement and recuperation on the cohort data refers to the method which was originally proposed by Frejka (2011) and Lesthaeghe (2001) and further developed by Sobotka et al. (Sobotka et al., 2011). This method allows for calculation of fertility postponement and recuperation measures with respect to a benchmark cohort chosen as the one that first experiences an onset of the increase in the mean age of motherhood at first birth. The results show the remarkable changes in the fertility patterns in Poland. The main driving forces behind the change in fertility patterns in Poland are related to the postponement of first births along with a relatively good recuperation. The magnitude of recuperation for Polish cohorts dropped significantly for second births and was almost non-existent for third and higher births. Therefore, the pattern of fertility in Poland observed till 2015 could be characterized by postponement and recuperation of first births along with a significant decrease in second births with perpetual postponement of third and higher births.
    Źródło:
    Studia Demograficzne; 2018, 174, 2; 5-23
    0039-3134
    Pojawia się w:
    Studia Demograficzne
    Dostawca treści:
    Biblioteka Nauki
    Artykuł
    Tytuł:
    Concept for energy recovery in city buses based on organic Rankine cycle system
    Autorzy:
    Pałczyński, T.
    Powiązania:
    https://bibliotekanauki.pl/articles/175273.pdf
    Data publikacji:
    2016
    Wydawca:
    Polska Akademia Nauk. Czytelnia Czasopism PAN
    Tematy:
    city bus dynamics
    waste heat energy recuperation
    Simulink
    Opis:
    This paper presents a concept for energy recovery in city buses, based on organic Rankine cycle (ORC) system modeling. ORC modeling provides preliminary parameters which enable estimation of transient state energy flow, especially at those points in the system where it can mostly easily be recovered (exhaust, cooling and brakes). The paper describes an easy-to-use procedure for time-domain analysis of velocity waves in a real driving cycle. The results were combined with a dynamic system model of a city bus in block diagram environment, taking into account the influence of parameters assumed to have the greatest impact on the model’s accuracy. Average fuel consumption and producer specifications (maximum vehicle speed, rate of acceleration) were used as reference parameters. A procedure was developed for tuning the simulation model according to the reference parameters. The results of the simulation, based on real measurements of Lodz city traffic parameters, are discussed and an estimate is made of the potential for energy recovery in city buses.
    Źródło:
    Transactions of the Institute of Fluid-Flow Machinery; 2016, 131; 131-150
    0079-3205
    Pojawia się w:
    Transactions of the Institute of Fluid-Flow Machinery
    Dostawca treści:
    Biblioteka Nauki
    Artykuł
    Tytuł:
    Research to estimate energy efficiency of a ventilation and air conditioning heat pump system inside a production premise with ventilation air recovery
    Autorzy:
    Bezrodny, Myhailo Kostiantynovych
    Misiura, Tymofii Oleksiyovych
    Powiązania:
    https://bibliotekanauki.pl/articles/1955060.pdf
    Data publikacji:
    2021
    Wydawca:
    Polska Akademia Nauk. Czytelnia Czasopism PAN
    Tematy:
    air conditioning
    heat pump system
    refrigeration efficiency
    recuperation
    Opis:
    The research provides a thermodynamic analysis of the theoretical model of a ventilation and air conditioning heat pump system with the ventilation air cold energy recovery depending on outside air parameters, the recovery efficiency and characteristics of a premise. A confectionery production workshop was taken as a prototype where technological conditions (temperature and humidity) must be maintained during the warm season. Calculations using the method of successive approximations to estimate air parameters at system’s nodal points were conducted. It allowed to determine theoretical refrigeration efficiency of the studied system and proved advantages of heat recuperation for smaller energy consumption. The model can be applied for design of heating, ventilation, and air conditioning units which work as a heat pump. The studied system has the highest energy efficiency in the area of relatively low environment temperatures and relative humidity which is suitable for countries with temperate continental climates characterized by low relative humidity.
    Źródło:
    Archives of Thermodynamics; 2021, 42, 4; 69-86
    1231-0956
    2083-6023
    Pojawia się w:
    Archives of Thermodynamics
    Dostawca treści:
    Biblioteka Nauki
    Artykuł
    Tytuł:
    Effective Laboratory Method of Chromite Content Estimation in Reclaimed Sands
    Autorzy:
    Ignaszak, Z.
    Prunier, J. B.
    Powiązania:
    https://bibliotekanauki.pl/articles/380085.pdf
    Data publikacji:
    2016
    Wydawca:
    Polska Akademia Nauk. Czytelnia Czasopism PAN
    Tematy:
    chromite sand
    magnetic recuperation
    neodymium magnets
    furan sand dry
    reclamation
    ferrous alloys
    heavy castings
    Opis:
    The paper presents an original method of measuring the actual chromite content in the circulating moulding sand of foundry. This type of material is applied for production of moulds. This is the case of foundry which most frequently perform heavy casting in which for the construction of chemical hardening mould is used, both the quartz sand and chromite sand. After the dry reclamation of used moulding sand, both types of sands are mixed in various ratios resulting that in reclaimed sand silos, the layers of varying content of chromite in mixture are observed. For chromite recuperation from the circulating moulding sand there are applied the appropriate installations equipped with separate elements generating locally strong magnetic field. The knowledge of the current ratio of chromite and quartz sand allows to optimize the settings of installation and control of the separation efficiency. The arduous and time-consuming method of determining the content of chromite using bromoform liquid requires operational powers and precautions during using this toxic liquid. It was developed and tested the new, uncomplicated gravimetric laboratory method using powerful permanent magnets (neodymium). The method is used in the production conditions of casting for current inspection of chromite quantity in used sand in reclamation plant.
    Źródło:
    Archives of Foundry Engineering; 2016, 16, 3; 162-166
    1897-3310
    2299-2944
    Pojawia się w:
    Archives of Foundry Engineering
    Dostawca treści:
    Biblioteka Nauki
    Artykuł
    Tytuł:
    Influence of heat recuperation in ORC power plant on efficiency of waste heat utilization
    Autorzy:
    Borsukiewicz-Gozdur, A.
    Powiązania:
    https://bibliotekanauki.pl/articles/240646.pdf
    Data publikacji:
    2010
    Wydawca:
    Polska Akademia Nauk. Czytelnia Czasopism PAN
    Tematy:
    nadkrytyczna siłownia organiczna
    odzyskiwanie ciepła
    heat recuperation
    ORC
    subcritical power plant
    supercritical organic cycle
    Opis:
    The present work is devoted to the problem of utilization of the waste heat contained in the exhaust gases having the temperature of 350[degrees]C. Conversion of the waste heat into electricity using a power plant working with organic fluid cycles is considered. Three Organic Rankine Cycle (ORC) power plant solutions are analysed and compared: a solution with the basic, single thermodynamic conversion cycle, one with internal heat recuperation and one with external heat recuperation. It results from the analysis that it is the proper choice of the working fluid evaporation temperature that fundamentally affects the maximum of the ORC plant output power. Application of the internal heat recuperation in the plant basic cycle results in the output power increase of approx. 5%. Addition of the external heat recuperation to the plant basic cycle, in the form of a secondary supercritical ORC power cycle can rise the output power by approx. 2%.
    Źródło:
    Archives of Thermodynamics; 2010, 31, 4; 111-123
    1231-0956
    2083-6023
    Pojawia się w:
    Archives of Thermodynamics
    Dostawca treści:
    Biblioteka Nauki
    Artykuł
      Wyświetlanie 1-5 z 5

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