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    Wyświetlanie 1-2 z 2
    Tytuł:
    Development of the Jackson and Hunt Theory for Rapid Eutectic Growth
    Autorzy:
    Wołczyński, W.
    Powiązania:
    https://bibliotekanauki.pl/articles/353984.pdf
    Data publikacji:
    2018
    Wydawca:
    Polska Akademia Nauk. Czytelnia Czasopism PAN
    Tematy:
    Jackson and Hunt theory
    diffusion equation
    coupled eutectic growth
    Aziz’s theory
    oscillatory mode of eutectic growth
    Opis:
    A development of the Jackson-Hunt’s theory is delivered. Contrary to Jackson-Hunt’s theory for ideally coupled growth the current description is dealing with the coupled eutectic growth which is more realistic than an ideal course of eutectic structure formation. Thus, the undercooling of every eutectic phase is not equal to each other. A new boundary condition is introduced to solve the diffusion equation. According to this condition, the eutectic concentration is always maintained at the triple point of the solid / liquid (s/l) interface. Therefore, the solution to diffusion equation is given separately for both lamellae. The mass balance is satisfied by the current solution. Both thermodynamic equilibrium and mechanical equilibrium are assumed to be situated at the triple point of the s/l interface, only. A protrusion of the leading phase over the wetting phase is defined mathematically due to the mass balance fulfilment. The current description is associated with the asymmetrical phase diagrams. Finally, the current description is applied to interpretation of the rapid eutectic growth. Therefore, Aziz’s concept for the changes of partition ratio versus growth rate is introduced into the description. As a result, the rapid formation of the eutectic structure is described by the oscillatory mode. Interpretation of the oscillatory mode of the eutectic structure formation is illustrated in the arbitrary eutectic phase diagram. The eutectic structure, obtained through the detonation gas spraying onto the steel substrate (rapid solidification) is delivered to illustrate the present description.
    Źródło:
    Archives of Metallurgy and Materials; 2018, 63, 1; 65-72
    1733-3490
    Pojawia się w:
    Archives of Metallurgy and Materials
    Dostawca treści:
    Biblioteka Nauki
    Artykuł
    Tytuł:
    Exploring Ecopreneurship in the Blue Growth: A Grounded Theory Approach
    Autorzy:
    Lasner, Tobias
    Hamm, Ulrich
    Powiązania:
    https://bibliotekanauki.pl/articles/520223.pdf
    Data publikacji:
    2014
    Wydawca:
    Polska Akademia Nauk. Czytelnia Czasopism PAN
    Tematy:
    aquaculture
    blue growth
    diffusion of innovation ecopreneurship
    Everett M. Rogers
    fish farmers
    grounded theory
    qualitative research
    social change
    Opis:
    Fisheries and aquacultures, the farming of fish, provide people livelihoods in rural and coastal societies all over the world. Fish, mussels, crabs and seaweed are captured in wild seas, lakes, and rivers or farmed in ponds, raceways, and cage cultures. Simultaneously, the fisheries sector faces many challenges: Overfishing endangers biodiversity and the natural regeneration capacity of marine resources; inequality occurs in case of the distribution of fishing permissions and technologies; the skyrocketing economic growth of aquaculture (so called ‘Blue Growth’) can lead to high environmental risks. All these dynamics cause social changes for fishers and fish farmers and in consequence for the future of their enterprises. In particular, the imbalance between supply from overfished oceans and the increasing demand for seafood grows from year to year. Modernising the aquaculture sector and its intensification seem to be the only possibility to close this gap and is one of the most important aims of the current reform of the Common Fisheries Policy of the European Commission. Thus, to match the challenges for marine fisheries in the near future is closely related to the further development of marine and inland aquaculture. But, conventional aquacultures are often connected with environmental risks. One possibility to overcome the environmental challenges and to reduce the pollution output of aquacultures at the same time can be seen in an ecological modernisation of the sector. The central protagonist in an ecological modernisation is the ecological orientated entrepreneur (ecopreneur). In the last decades a few ecopreneurial inland fish farmers have started to adopt two very different ecological innovations: idea−based organic practices or technology−based recirculating aquaculture systems. Nowadays, it is not certain whether these both ‘green’ innovations will diffuse or not in the aquacultural sector. Using the Grounded Theory approach, biographical interviews with German fish farmers, both ecopreneurial pioneers and conventional farmers, were conducted and analysed to carry out the underlying reasons for or against the implementation of ecological innovations from the point of view of the adopting unit: the fish farmers. Building on empirical insights as well as sociologies of social change and diffusion of innovations, a middle−range theory of ecopreneurships in aquaculture was developed, which addressed the apparently simple question: Why do some fish farmers adopt an ecological innovation, and some do not? Basically, our results show, that fish farmers' decision−making−process towards an ecological innovation is not only guided by economic cost−benefit calculation, but by a complex of patterns, where economic perspectives meet ecological motives as well as social aspects. By trend, those fish farmers, who had a strong ecological motivation, were embedded into a ‘green−minded’ social network and had a high degree of identification with their innovative production method, were willing to take higher risks in the adaption process of an ecological innovation than their conventional colleagues. Furthermore, our article argues that there is a need for further sociological approaches in fisheries and aquaculture research to understand patterns of acting motivation among seafood protagonists in deep. Understanding the fish farmers’ perspectives, their construction of reality, can provide a sustainable fisheries and aquaculture management policy, which will be widely accepted by the individuals concerned.
    Źródło:
    Roczniki Socjologii Morskiej; 2014, 23; 4-20
    0860-6552
    Pojawia się w:
    Roczniki Socjologii Morskiej
    Dostawca treści:
    Biblioteka Nauki
    Artykuł
      Wyświetlanie 1-2 z 2

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