99 research outputs found

    Introduction

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    Understanding and strengthening European Union-Canada relations in Law of the Sea and Ocean Governance

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    The recent history of international ocean relations between Canada and the European Union (EU) merits particular scholarly attention. The headlines in the media have tended to focus on differences rather than commonalities, and in particular those few differences that led to confrontation, probably not without some assistance from the media. The “Turbot War” in the 1990s is by now a classic case of confrontation on the high seas motivated by conflicting fisheries and related conservation interests.https://digitalcommons.schulichlaw.dal.ca/faculty_books/1080/thumbnail.jp

    Spectral scale transformations of nonstationary optical fields

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    The notions of cross-spectral purity and spectral invariance of light impose specific structures for the field coherence. Such concepts were originally introduced for stationary light and recently extended to nonstationary fields. In this work, we establish general conditions for transforming scalar, pulsed, isodiffracting light beams produced, for instance, in usual spherical-mirror laser resonators, to nonstationary secondary sources that exhibit cross-spectral purity or spectral invariance. Further, we introduce hybrid refractive-diffractive imaging systems which perform the desired transformation accurately over a wide spectral range irrespective of the spatial coherence of the incident isodiffracting beam.publishedVersionPeer reviewe

    Generation of pulse trains with nonconventional temporal correlation properties

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    We apply time dependent spectral phase modulation to generate pulse trains that are spectrally and temporally partially coherent in an ensemble averaged sense. We consider, in particular, quadratic spectral phase modulation of Gaussian pulses, and demonstrate two particular types of nonuniformly correlated pulse trains. The controlled partial temporal coherence of the nonstationary fields is generated using a pulse compressor and experimentally verified with frequency resolved optical gating (FROG). We show that the correlation characteristics of such pulse trains can be retrieved directly from the FROG spectrograms provided one has certain a priori knowledge of the pulse train. Our results open a pathway for experimental confirmation of several correlation induced effects in the temporal domain.acceptedVersionPeer reviewe

    Monitoring of IVF birth outcomes in Finland: a data quality study

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    BACKGROUND: The collection of information on infertility treatments is important for the surveillance of potential health consequences and to monitor service provision. STUDY DESIGN: We compared the coverage and outcomes of IVF children reported in aggregated IVF statistics, the Medical Birth Register (subsequently: MBR) and research data based on reimbursements for IVF treatments in Finland in 1996–1998. RESULTS: The number of newborns were nearly equal in the three data sources (N = 4331–4384), but the linkage between the MBR and the research data revealed that almost 40% of the reported IVF children were not the same individuals. The perinatal outcomes in the three data sources were similar, excluding the much lower incidence of major congenital anomalies in the IVF statistics (157/10 000 newborns) compared to other sources (409–422/10 000 newborns). CONCLUSION: The differences in perinatal outcomes in the three data sets were in general minor, which suggests that the observed non-recording in the MBR is most likely unbiased
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