Retirement provision for New Zealand women: The relative role of demographic influence

This research contributes to our knowledge of retirement provision by clarifying the obstacles that women face in relation to old age provision. By using multivariate analysis and therefore by controlling for confounding effects, this study has isolated the particular influence of important socio-economic factors. Through continued participation in the labour market, despite their childbearing roles, and the goal of enhancing the quality of their employment, women have an opportunity to strengthen their ability to provide sufficiently themselves for their own old age but this is still even today not a certainty or a source of unlimited support

On subtrees of the representation tree in rational base numeration systems

International audienc

Run-Based Semantics for RPQs

The formalism of RPQs (regular path queries) is an important building block of most query languages for graph databases. RPQs are generally evaluated under homomorphism semantics; in particular only the endpoints of the matched walks are returned. Practical applications often need the full matched walks to compute aggregate values. In those cases, homomorphism semantics are not suitable since the number of matched walks can be infinite. Hence, graph-database engines adapt the semantics of RPQs, often neglecting theoretical red flags. For instance, the popular query language Cypher uses trail semantics, which ensures the result to be finite at the cost of making computational problems intractable. We propose a new kind of semantics for RPQs, including in particular simple-run and binding-trail semantics, as a candidate to reconcile theoretical considerations with practical aspirations. Both ensure the output to be finite in a way that is compatible with homomorphism semantics: projection on endpoints coincides with homomorphism semantics. Hence, testing the emptiness of result is tractable, and known methods readily apply. Moreover, simple-run and binding-trail semantics support bag semantics, and enumeration of the bag of results is tractableComment: 35 page

Stochastic precession of the polarization in a polariton laser

Microcavity polaritons in the lasing regime undergo a spontaneous symmetry breaking transition resulting in coherent emission with a well defined polarization. The order parameter is thus a vector describing both the laser global phase and polarization. Using an ultrafast single-shot detection technique we show that polariton lasing in GaAs-based microcavities presents a high degree of second order coherence ($g^{(2)}(\tau=0) \approx 1$) above threshold, and that the initial polarization is stochastic, taking any possible direction in the Poincar\'e sphere (linear, elliptical or circular). Once the polarization direction is established, subsequent oscillations of the emission probability witness the presence of an intrinsic polarization splitting. Our results show the negligible role of polariton interactions in the total emission statistics and in the establishment of the initial polarization.Comment: 9 pages, 6 figure

Un modèle de lubrification en régime mixte du laminage : Frottement et lubrification en mise en forme = A mixed lubrication model of the cold strip rolling process

Free access articleInternational audienceLe régime de lubrification mixte est le plus fréquemment rencontré en laminage à froid. Sa modélisation est le but de cet article. La lubrification, phénomène interfacial, est fortement couplée à la mécanique de l'opération de laminage. C'est pourquoi le modèle présenté assemble un modèle macroscopique de laminage (méthode des tranches élasto-plastique) et un modèle microscopique de lubrification en régime mixte, lui-même composé d'une équation de Reynolds entre surfaces rugueuses (formation du film lubrifiant) et d'une équation d'évolution de la rugosité, par conformation de la tôle au cylindre. Les principes du modèle sont présentés, comparés à ceux de la bibliographie, ses hypothèses et ses résultats sont discutés, et quelques applications sont évoquées = The mixed regime of lubrication is most frequently encountered in cold strip rolling processes. A model is presented hereafter. The lubrication at the interface is closely coupled with the mechanics of the rolling process. Therefore, the proposed model combines a macroscopic model of rolling (elastic-plastic slab method) with a microscopic mixed lubrication model, consisting of a Reynolds equation for rough surfaces (describing the formation of the lubricant film) and an equation for the evolution of roughness, describing the conformation of the strip surface to the roll. The bases of the model are presented and compared to models in the literature; its hypotheses and results are discussed, a few applications are given

Éléments d’« anthropologie punk » sur l’espace des Wagenburgen berlinoises

Les espaces insurrectionnels des Wagenburgen berlinoises, sont des lieux de délibérations conflictuelles et épuisantes, en quête de démocratie dans les conditions de l’expérience. Leurs acteur.trice.s expriment des ressentis complexes de dépit/exaltation que l’anthropologie cherche à restituer. Construisant un diagramme non hiérarchique de confrontations, entre les réactions des habitant(e)s, l’écrit du chercheur et la performativité d’images réalisées en commun, on ouvre l’espace incertain d’une anthropologie punk. On suggère ici que, par son silence et son indétermination, il serait un devenir permettant l’accès à une perception interne des questionnements.Insurrectional spaces in origin, the Berlin Wagenburgen are squatted places where the search for democratic conditions of living is a conflictual and exhausting process. Their inhabitants express complex feelings of rancor/exaltation that anthropology seeks to reconstruct. The non‑hierarchical diagram of the confrontations between the inhabitants’ accounts, the researcher’s analysis, and jointly created performative images opens up the uncertain space of a punk anthropology. Here we suggest that, in its silence and imprecision, this space could be a becoming that allows access to an internal perception of the questions at stake