Dunkerque, France

University of the Littoral Opal Coast , also known as ULCO, is a French university, based in Dunkerque. It reports to the Academy of Lille and is a member of the European Doctoral College Lille-Nord-Pas de Calais.ULCO is situated in Pas-de-Calais, in the north of France, north west of Lille. The full name is "Université du Littoral - Côte d'Opale". The university is divided in four parts, in four cities: Boulogne sur Mer Calais Dunkerque Saint-OmerIt was created in 1991; the first year of studies was in 1992. Several degrees are granted there, and the university was integrated in the European Space of Higher Education in 2004 . Wikipedia.


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Efstathiou K.,University of Groningen | Sadovskii D.A.,University of the Littoral Opal Coast
Reviews of Modern Physics | Year: 2010

The hydrogen atom perturbed by sufficiently small homogeneous static electric and magnetic fields of arbitrary mutual alignment is a specific perturbation of the Kepler system with three degrees of freedom and three parameters. Normalization of the Keplerian symmetry reveals that the parameter space is stratified into resonant zones of systems, each zone with an internal dynamical stratification of its own (Efstathiou, Sadovskií, and Zhilinskií, 2007, Proc. R. Soc. London, Ser. A 463, 177110.1098/rspa. 2007.1843). Based on the fully integrable approximation, the bundle of invariant tori of individual systems within zones is characterized globally and the qualitative dynamical stratification is uncovered. The techniques involved in this analysis are illustrated with the example of the 1:1 resonance zone (near orthogonal fields) whose structure is known at present. Applications in the corresponding quantum system are also described. © 2010 The American Physical Society.


Grant
Agency: European Commission | Branch: FP7 | Program: CP-FP | Phase: SPA.2011.1.5-03 | Award Amount: 3.36M | Year: 2011

The first level of GMES applications in the marine area is mostly represented by the upstream services of the MCS (e.g. MyOcean). Unfortunately, the current MyOcean offering of products and services for biogeochemistry has limitations that prevent a full uptake by the potential users. The present project proposes to address these issues through a range of R&D activities designed to offer a set of solutions that shall benefit the Marine Core Service beyond 2015. The outcomes of the project are expected to benefit both the upstream and downstream services of the MCS. To achieve this, the OSS2015 team will conduct R&D work in three areas: o The derivation of 3-D and 4-D representations of biogeochemical variables from the integration of gliders and floats in situ data and EO satellite data into cutting-edge numerical biogeochemical and bio-optical models. The models, assimilation schemes and output products from the models will be tested at two pilot sites (Mediterranean and North Atlantic) o The generation and validation of satellite derived global time series of advanced biogeochemical products (POC, NPP, PFT, PSD) for carbon cycle science. o The implementation of a prototype platform of on-demand services for product generation and distribution. This system of services will be tested and demonstrated with the new biogeochemistry products developed during the project. OSS2015 will also analyse the social and economical benefits and value of the products and services generated by the project. The OSS2015 team is a good balance of ten partners from six scientific research institutions and four SMEs and is designed to cover the needs of both science users and users interested in more applied services. A strong emphasis will be put on dialogue and interaction with users in order to identify their actual needs and adapt the OSS2015 services accordingly whenever possible.


Vanhelst J.,University of the Littoral Opal Coast
Journal of sports sciences | Year: 2010

The aim of this study was to determine thresholds for various intensities of physical activity in children and adolescents using the RT3 accelerometer. Forty healthy participants aged 10-16 years were recruited to the study. To validate the RT3 accelerometer data, an independent sample of 20 children and adolescents aged 10-16 years performed the same activities. Accelerometer data, heart rate, and oxygen consumption were measured at nine levels of physical activity, which varied in intensity: sedentary, light, moderate, and vigorous. Age and sex did not affect thresholds. The activity categories and accelerometer counts were: sedentary activity, 0-40 counts x min(-1); light activity, 41-950 counts x min(-1); moderate activity, 951-3410 counts x min(-1); and vigorous activity, >3410 counts x min(-1), respectively. These thresholds were considered valid as the difference between threshold values obtained using two independent groups of children was not significant. This study has established threshold values for various physical activities and enables the RT3 accelerometer to be used to quantify the duration of various levels of activity in adolescents under free-living conditions.


Vanhelst J.,University of the Littoral Opal Coast
Journal of sports sciences | Year: 2010

The aim of this study was to assess the reliability of the RT3 accelerometer under conditions of normal physical activity. Sixty healthy individuals (30 boys, 30 girls) aged 10-16 years wore two accelerometers while performing different structured physical activities. The accelerometers were synchronized and data were recorded every minute during nine 15-min sessions of physical activity that varied in intensity from sedentary (watching television, playing video games) to vigorous (running on a treadmill at different speeds). Intra-instrument coefficients of variation (CV) were assessed using the formula CV = standard deviation of the measure x 100/mean of the measure. The intra-instrument coefficient of variation was higher for sedentary (17%) and light activity (16.2%) than moderate (9.3%) and vigorous activity (6.6%). These results confirmed the poor reliability of the RT3 for activity of low magnitude and frequency that was demonstrated in studies using a shaker.


Dupre P.,University of the Littoral Opal Coast
Physical Review A - Atomic, Molecular, and Optical Physics | Year: 2015

By analyzing the decaying intensity, leaking out a high-finesse cavity previously "filled" by a cw laser source (using the cavity ring-down spectroscopy technique), we observed frequency beating between what we think are two orthogonal eigenpolarization states of the intracavity electromagnetic field. The time decay (ring down) is analyzed by varying the angle of the polarization analyzer located in front of the detector. A full modeling of the observed signal is proposed. It is based on the Jones matrix formalism required for modeling the cavity behavior following a rotated phase shifter. The full transfer function is first established in the frequency domain, and then Fourier transformed to recover the temporal response. The same optical cavity, i.e., constituted of the same set of mirrors, is used at two different wavelengths (∼800 and ∼880 nm). It demonstrates the differences in behavior between a high-finesse cavity (∼400000) and a lower finesse cavity (∼50000). Beating frequency, characteristics time, and beat amplitude are mainly discussed versus the analyzer angle. A cavity birefringence of ∼1.6×10-5 rad, resulting from the mirror birefringence is suggested. If the current analysis is in agreement with pulsed CRDS experiments (polarimetry) obtained in an isotropic moderate-finesse cavity, it differs from a recent work report on a high-finesse cavity associated with a source mode locking [Phys. Rev. A 85, 013837 (2012)PLRAAN1050-294710.1103/PhysRevA.85.013837]. © 2015 American Physical Society.


Dupre P.,University of the Littoral Opal Coast
Journal of the Optical Society of America B: Optical Physics | Year: 2015

An analytical methodology is presented to calculate spectra provided by NICE-OHMS. It is based on the solutions of the equations of motion of an open two-blocked-level system performed in the frequency domain. The polychromaticity of the impinging electromagnetic field, furthermore, trapped inside a high-finesse cavity, is a potential source of induced resonances when this field interacts with a weakly absorbing nonlinear medium. These are optimal conditions to produce the well-established hole burning. However, the radio-frequency sidebands intrinsically associated with the NICE-OHMS technique require a specific treatment for describing both absorption and optical phase shift contributions. To validate the approach, numerical simulations of two transitions of C2H2 in the near-infrared range are discussed. The Doppler broadening-free cross-sideband resonances have been clearly characterized under the regime of moderate electromagnetically induced saturation. Comparison to experimental data available [Opt. Express 16, 14689 (2008)] allowed us to assess the eligibility of the approach. © 2015 Optical Society of America.


Le Blanc A.,University of the Littoral Opal Coast
Regional Studies | Year: 2010

Cultural districts, a new strategy for regional development? The South-East Cultural District in Sicily, Regional Studies. The industrialization of cultural production and a strong trend for the development of regional networks have recently led to the creation of new spatial and economic forms called 'cultural districts'. However, these new economic systems rely on very different geographical bases, types of products, and developmental processes. In Italy, the first cultural district was created in 2004 to foster the preservation of cultural heritage and boost tourist development in the late Baroque cities of the so-called Val di Noto in south-east Sicily. The main objective of the district is to support local socio-economic development through the promotion of the region's architectural cultural heritage and the local craft industry. The new structure aims at creating a real network between these towns so that they can compete globally. A specific form of spatial organization, the newly created South-East Cultural District, is based on cultural and architectural similarities, but is confronted with major obstacles such as economic heterogeneity, a lack of innovation, and physical distance between the towns. Such obstacles will have to be overcome if success is expected in creating synergies and in integrating other economic sectors. © 2010 Regional Studies Association.


Bourn D.,University of the Littoral Opal Coast
Applied Categorical Structures | Year: 2014

We investigate what is the common part of the action accessible and the fibrewise algebraically cartesian closed (facc) categories dealing with the existence of centralizers of equivalence relations. Doing this, we shall introduce some new aspects of the Beck-Chevalley commutation with respect to the fibration of points and shall characterize the existence of those centralizers by a specific property of this same fibration. © 2013, Springer Science+Business Media Dordrecht.


Stubbe I.,University of the Littoral Opal Coast
Fuzzy Sets and Systems | Year: 2014

This survey paper, specifically targeted at a readership of fuzzy logicians and fuzzy set theorists, aims to provide a gentle introduction to the basic notions of quantaloid-enriched category theory. We discuss at length the definitions of quantaloid, quantaloid-enriched category, distributor and functor, always giving several examples that - hopefully - appeal to the intended readership. To indicate the strength of this general theory, we explain in considerable detail how (co)limits are dealt with, and particularly how the Yoneda embedding of a quantaloid-enriched category in its free (co)completion comes to be. Our insistence on quantaloid-enrichment (rather than quantale-enrichment) is duly explained by examples requiring a notion of "partial elements" (sheaves, partial metric spaces). A final section glosses over some further topics, providing ample references for the interested reader. © 2013 Elsevier B.V.


Zribi M.,University of the Littoral Opal Coast
Information Fusion | Year: 2010

Image fusion refers to the techniques that integrate complementary information from multiple image sensors' data in a way that makes the new images more suitable for human visual perception and reduces computation processing tasks. In this paper, we propose a non-parametric and region-based image fusion based on the Bootstrap sampling (BS) principle, which reduces the dependence effect of pixels in real images and minimizes the fusion time. Given an original image, we randomly select a small representative set of pixels. In the statistical image formation model, image sensors are described as the true scene corrupted by additive non-Gaussian distortion. Then, a Non-parametric Expectation-Maximization (NEM) algorithm would be used to estimate both the model parameters and the fused image. The non-parametric aspect comes from the use of the orthogonal series' estimator. Obtained results show that the BS method gives better results than the classical one, both for fused image quality as well as for computation time. © 2008 Elsevier B.V. All rights reserved.

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