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Abstract

In the post-communist era, the European migration space changed significantly. It has become charac-terised predominantly by temporary labour migration and new forms of circular, return and onward migration which are collectively theorised as ‘liquid’. The 2004/2007 eastward expansion of the EU resulted in the re-emergence of large-scale East-West intra-EU migration; however, Czechia continues to have one of the lowest levels of emigration among EU member-states in Central and Eastern Europe (CEE). This article analyses Czech migration to New Zealand, which constitutes a considerable portion of overall Czech emigration. It is hypothesised that this flow can be understood as an example of ‘liquid’ migration beyond the EU to a distant settler society. Data from Immigration New Zealand and Stats NZ are examined to identify the trends, patterns and sociodemographic profile of Czech-to-New Zealand migration; other secondary sources provide a preliminary sketch of the motivations behind (and lived experiences of) Czech migrants in New Zealand. The study finds that this migration is increasing – mostly for temporary work, holidaying or visiting friends and relatives – and one of the largest, young-est and most recently arrived migrant groups from the CEE EU-10 countries. It is concluded that Czechia’s comparatively high standard of living may be an explanatory factor behind the relatively large flow of its people to New Zealand and that further qualitative investigation is needed to elucidate the motivations and diverse experiences of individual Czech migrants. The article ultimately contributes to comparative migration studies by exploring a potentially unique case of liquid migration to a tradi-tional settler society.

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Authors and Affiliations

Oksana Opara
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Abstract

Turbogenerator coil retaining rings are shrunk-fitted onto the rotor over the coils, in order to restrain them against the centrifugal force. They are typically subjected to low cycle fatigue, with a cycle being completed at every machine switch-on and switch-off. The subject of this paper consists in the determination of the failure probability of a coil retaining ring. The failure mode of the ring cracking, when it swells in tension, due to the centrifugal force is here considered. The reliability assessment is preceded by the study of the input variables affecting the low-cycle fatigue load and of their stochastic distributions. This question is tackled by the experimental determination of the static, cyclic and fatigue curves of the involved material and by the application of a statistical model to compute related parameters and their standard deviations. Upon the determination of variable distributions, the probability of failure is estimated in the form of a cumulative distribution function by a computationally efficient methodology, based on the Advanced Mean Value approach. The obtained results account for the material response and the local stressstrain states at the most loaded coil retaining ring region. The determined probability at the end of the machine life, in the order of 10-12, is compatible with reference values for structures under fatigue in the mechanical and aeronautical fields.

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Authors and Affiliations

Giorgio Olmi
Alessandro Freddi

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