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    Wyświetlanie 1-4 z 4
    Tytuł:
    Przestrzenne zróżnicowanie starzenia się ludności Polski w latach 1995-2035
    Polansd’s population ageing by regions, in 1995-2035 years
    Autorzy:
    Wolańska, Wioletta
    Powiązania:
    https://bibliotekanauki.pl/articles/904476.pdf
    Data publikacji:
    2013
    Wydawca:
    Uniwersytet Łódzki. Wydawnictwo Uniwersytetu Łódzkiego
    Tematy:
    old-age dependency
    ageing index
    double ageing
    old-age rate
    ageing of population
    Opis:
    The second transition manifesting in the preference of informal relationships, decreased death rate, longer life, increased migration, strive for maximum use of education, income, and increased life standard and quality contribute to the decreased birth rate (below the level ensuring linear replacement of generations) lids to ageing of population. It is a process in which changes occur in population age structure and an increase in the number and proportion of older people (especially people aged over 65) in the general population, as well as a decrease in the number of young people This process leads to outcomes which, apart from demographic implications, are of socioeconomic significance and influence changes in the structure of consumption, income and savings distribution, decrease in labour productivity, changes in household structure, healthcare and social care for the elderly. This is why questions resulting from ageing of the population must be an element of adequate social policy. The aim of the paper is an evaluation of Poland’s population ageing by regions, in 1995-2035 years.
    Źródło:
    Acta Universitatis Lodziensis. Folia Oeconomica; 2013, 291
    0208-6018
    2353-7663
    Pojawia się w:
    Acta Universitatis Lodziensis. Folia Oeconomica
    Dostawca treści:
    Biblioteka Nauki
    Artykuł
    Tytuł:
    Aktywność zawodowa w okresie starości w opiniach przedstawicielek dwóch pokoleń
    Autorzy:
    Thel, Karolina
    Powiązania:
    https://bibliotekanauki.pl/articles/2157656.pdf
    Data publikacji:
    2015
    Wydawca:
    Instytut Studiów Międzynarodowych i Edukacji Humanum
    Tematy:
    ageing
    ageing society
    professional activity
    retirement age
    generation gap
    double bur-
    Opis:
    Demographic changes seen in Europe represent the challenge for social protection system and for the job market. In most countries of European Union we can see a clear tendency to increase retirement age. In our country breaking the reluctance towards the attempts of increasing retirement age appears to be difficult, and only a small percentage of employees decide to continue their professional career after coming to retirement age. The aim of research was to deepen the diagnosis concerning the phenomenon of low professional activity of women being at retirement age by looking into intergeneration differenc- es. Results shows negative attitude to the idea of professional activity in the old age, which is motivated mainly by health problems, labor market conditions and women’s double burden.
    Źródło:
    Społeczeństwo i Edukacja. Międzynarodowe Studia Humanistyczne; 2015, 2(17); 67-77
    1898-0171
    Pojawia się w:
    Społeczeństwo i Edukacja. Międzynarodowe Studia Humanistyczne
    Dostawca treści:
    Biblioteka Nauki
    Artykuł
    Tytuł:
    Analysis of the Corrosion Resistance of Aircraft Structure Joints with Double-Sided Rivets and Single-Sided Rivets
    Autorzy:
    Kamińska, Paulina
    Synaszko, Piotr
    Ciężak, Patryk
    Dragan, Krzysztof
    Powiązania:
    https://bibliotekanauki.pl/articles/2105143.pdf
    Data publikacji:
    2020
    Wydawca:
    Sieć Badawcza Łukasiewicz - Instytut Lotnictwa
    Tematy:
    rivet joints
    double-sided rivets
    one-sided rivets
    corrosion
    accelerated ageing tests
    Opis:
    An important factor having a negative impact on the technical condition of aircraft structure elements is the adverse effect of the atmosphere, which causes formation of corrosion in aircraft structures, especially in riveted lap joints. The electric potential difference between the sheet material and the rivet, in the presence of humid air, may cause electrochemical corrosion. The paper presents specimens that imitate the repair on the Mi-24 helicopter with the use of blind rivets in places where solid double-sided rivets could not be used.The aim of the research was to assess the corrosion resistance of lap joints with the use of single-sided and double-sided rivets. The analysis of corrosion resistance was carried out based on accelerated aging tests in a salt spray chamber. The salt chamber tests were aimed at determining the changes taking place in the specimens exposed to the marine environment. In the course of periodic observations changes in the mass of the specimens and in the form of corrosion losses were recorded. These activities were aimed at determining whether the exposure of specimens in the salt chamber causes electrochemical corrosion or pillowing. In addition, the specimens were subjected to static strength tests to assess the effect of corrosion on the strength properties of riveted joints.
    Źródło:
    Fatigue of Aircraft Structures; 2020, 12; 57--68
    2081-7738
    2300-7591
    Pojawia się w:
    Fatigue of Aircraft Structures
    Dostawca treści:
    Biblioteka Nauki
    Artykuł
    Tytuł:
    Dynamic Mechanical Properties of Artifcially Aged Double Base Rocket Propellant and the Possibilities for the Prediction of Their Service Lifetime
    Autorzy:
    Matečić-Mušanić, S.
    Sućeska, M.
    Powiązania:
    https://bibliotekanauki.pl/articles/358886.pdf
    Data publikacji:
    2013
    Wydawca:
    Sieć Badawcza Łukasiewicz - Instytut Przemysłu Organicznego
    Tematy:
    ageing
    double base rocket propellants
    dynamic mechanical analysis
    glass transition temperature
    lifetime prediction
    loss modulus
    softening temperature
    storage modulus
    tan δ
    Opis:
    The ageing of double base (DB) rocket propellants, as a consequence of the chemical reactions and physical processes that take place over time, has a signifcant effect on their relevant properties, such as chemical composition and mechanical and ballistic properties. The changes to relevant properties limit the safe and reliable service life of DB rocket propellants. Accordingly, numerous research efforts have been undertaken to fnd reliable methods to measure the changes caused by ageing in order to assess the quality of DB rocket propellants at a given moment of their lifetime, and to predict their remaining service lifetime. In this work we studied the dynamic mechanical properties of DB rocket propellant artifcially aged at temperatures of 80, 85 and 90 °C, in order to detect and quantify changes in the dynamic mechanical properties caused by ageing, and to investigate the possibilities for the prediction of service lifetime. Dynamic mechanical properties were studied using a dynamic mechanical analyser (DMA). The results obtained have shown that ageing causes signifcant changes in the storage modulus (E´), the loss modulus (E˝) and the tan δ curves’ shape and position. These changes are quantifed by following some characteristic points on the E´-T, E˝-T, and tan δ-T curves (e.g. glass transition temperatures; storage modulus, loss modulus and tan δ at characteristic temperatures, etc.). It has been found that the monitored parameters are temperature and time dependent, and that they can be shown to be functions of the so called ‘reduced time of artifcial ageing’. In addition, it has been found that, on the basis of known changes in viscoelastic properties as a function of time and ageing temperature, and the known kinetic parameters of the ageing process, it is possible to calculate (determine) the change in the properties at any ageing temperature provided that the mechanism of the ageing process does not change. Unfortunately, the use of kinetic parameters obtained by artifcial ageing at high temperatures (above 60 °C) for the prediction of the propellant lifetime will not give reliable results, because the mechanisms of ageing at 85 °C and 25 °C are not the same.
    Źródło:
    Central European Journal of Energetic Materials; 2013, 10, 2; 225-244
    1733-7178
    Pojawia się w:
    Central European Journal of Energetic Materials
    Dostawca treści:
    Biblioteka Nauki
    Artykuł
      Wyświetlanie 1-4 z 4

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