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    Wyświetlanie 1-2 z 2
    Tytuł:
    Influence of Working Conditions on Parameters of Thermoacoustic Engine with Travelling Wave
    Autorzy:
    Dobrucki, Andrzej
    Kruk, Bartłomiej
    Powiązania:
    https://bibliotekanauki.pl/articles/177631.pdf
    Data publikacji:
    2020
    Wydawca:
    Polska Akademia Nauk. Czasopisma i Monografie PAN
    Tematy:
    thermoacoustics
    thermoacoustic engine
    travelling wave
    Opis:
    Thermoacoustic converters are devices for direct conversion of acoustic energy into thermal energy in the form of temperature difference, or vice versa – for converting thermal energy into an acoustic wave. In the first case, the device is called a thermoacoustic heat pump, in the second – thermoacoustic engine. Thermoacoustic devices can use (or produce) a standing or travelling acoustic wave. This paper describes the construction and properties of a single-stage thermoacoustic engine with a travelling wave. This kind of engine works using the Stirling cycle. It uses gas as a working medium and does not contain any moving parts. The main component of the engine is a regenerator equipped with two heat exchangers. Most commonly, a porous material or a set of metal grids is used as a regenerator. An acoustic wave is created as a result of the temperature difference between a cold and a hot heat exchanger. The influence of working gas, and such parameters as static pressure and temperature at heat exchanger on the thermoacoustic properties of the engine, primarily its efficiency, was investigated. The achieved efficiency was up to 1.4% for air as the working medium, which coincides with the values obtained in other laboratories. The efficiency for argon as working gas is equal to 0.9%.
    Źródło:
    Archives of Acoustics; 2020, 45, 3; 467-473
    0137-5075
    Pojawia się w:
    Archives of Acoustics
    Dostawca treści:
    Biblioteka Nauki
    Artykuł
    Tytuł:
    I don’t have this huge backlog of good feeling for her: Role-relational trajectories in interview accounts of caring for a relative with dementia
    Autorzy:
    Kruk, Bartłomiej
    Powiązania:
    https://bibliotekanauki.pl/articles/2135340.pdf
    Data publikacji:
    2020-12-01
    Wydawca:
    Uniwersytet im. Adama Mickiewicza w Poznaniu
    Tematy:
    role-relationships
    dementia caregiving
    family
    gender
    membership categorization analysis
    Opis:
    Caring for a family member with dementia involves multifaceted relational issues linked to the construction of caregiving as an emotional, symbolic and morally sanctionable practice inscribed in kin relations and dominant femininity (Paoletti 2007). As the disease disrupts taken-for-granted expectations for a person with dementia and the entire family, this qualitatively new situation necessitates the (re)negotiation of kin roles and responsibilities (Peel 2017; Purves 2011). By applying conversation analysis and membership categorization analysis to an audio-taped open-ended interview with an American female caregiver, this paper investigates in-depth how she discursively navigates complex familial role-relational trajectories while assisting her mother with dementia. The study examines the situatedness of role vis-á-vis self-other relations with assumptions about categories within the membership categorization devices ‘family’ and ‘gender’ being critical to this process. It documents how the participant contextualizes care experience not only in the standardized relational pair ‘daughter-mother’ but brings into focus a broader constellation of historical, contemporaneous or hypothetical aspects of kinship ties (e.g., with her parents, siblings or children), each of which invokes distinct expectations, responsibilities and loyalties which sometimes competing with other relations. The study thus exposes certain commonsense propositions concerning normative family role-relationships which function as powerful benchmarks for making life choices, interpreting one’s experiences, and morally evaluating oneself and others while providing care to kin with dementia.
    Źródło:
    Yearbook of the Poznań Linguistic Meeting; 2020, 6, 1; 183-220
    2449-7525
    Pojawia się w:
    Yearbook of the Poznań Linguistic Meeting
    Dostawca treści:
    Biblioteka Nauki
    Artykuł
      Wyświetlanie 1-2 z 2

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