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This paper presents a new framework to predict a structure's effective properties and sensitivities to multiple simultaneous uncertain endogenous parameters. The methodology is based on the use of fuzzy sets and this paper extends the fuzzy set theory to a dynamic finite element analysis of engineering systems containing uncertainty on material properties. A general algorithm, which can resolve the uncertain eigenvalue problem by using a Neumann expansion, is studied. This algorithm is applied to the study of the modal behavior of structures presenting uncertain material properties. Finally, the entropy and the specificity of fuzzy responses lead to the identification of a plate structure's most sensitive eigenvalue to uncertain sources.

With an increase in gender equality policies and gender balance targets within traditionally male professions, organisations such as the police service are experiencing changing demographics. How these shifts influence the construction of professional identity is unclear. Drawing on focus group data, this study aimed to explore identity construction of police officers across gender using a thematic analysis method. Two themes related to identity construction were found to be common to both male and female police officers: 'Working within a blue family' and 'Being a copper is a job for life'. However, the way in which these themes were articulated differed between male and female officers, with male officers experiencing more difficulty than female officers in terms of positioning their identity within the evolving police culture. The findings from this study have implications for gender policies in the workforce as they suggest that men may experience more difficulty that women in adjusting to a gender diverse workforce, and that professional identity within traditionally male professions is more complex and nuanced than what was previously assumed.

In conclusion, the four papers in this volume represent a move forward for psychobiography, and we believe that they demonstrate the way in which phenomenology and psychobiography can function in "easy alliance". We hope that the readers of this Special Edition enjoy reading the articles as much as we have.

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