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See detailL’e-commerce profite-t-il de l’harmonisation européenne des règles de protection du consommateur ?
Jacob, Damien ULg

in Carneroli, Sandrine; Colantonio, Fred; Laurent, Philippe (Eds.) et al Les entreprises et l'e-business: nouvelles tendances (2016)

Le 13 juin 2014 marquait la date limite d’entrée en vigueur dans tous les États membres de la législation harmonisée sur les règles de protection du consommateur en cas d’achat à distance. Pourquoi cette ... [more ▼]

Le 13 juin 2014 marquait la date limite d’entrée en vigueur dans tous les États membres de la législation harmonisée sur les règles de protection du consommateur en cas d’achat à distance. Pourquoi cette législation a-t-elle été mise en œuvre ? Comment cela s’est-il passé sur le terrain ? La réglementation protège-t-elle mieux l’e-consommateur ? Comment les professionnels de l’e-commerce l’ont-ils perçue ? Peut-on maintenant parler d’un marché unique de l’e-commerce au niveau européen ? [less ▲]

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See detailCost-effectiveness of personalized supplementation with vitamin D-rich dairy products in the prevention of osteoporotic fractures
Ethgen, Olivier ULg; Hiligsmann, Mickaël; Burlet, Nansa et al

in Osteoporosis International (2016), 27

Summary: Titrated supplementations with vitamin D-fortified yogurt, based on spontaneous calcium and vitamin D intakes, can be cost-effective in postmenopausal women with or without increased risk of ... [more ▼]

Summary: Titrated supplementations with vitamin D-fortified yogurt, based on spontaneous calcium and vitamin D intakes, can be cost-effective in postmenopausal women with or without increased risk of osteoporotic fractures. Introduction: The objective of this study is to assess the costeffectiveness of the vitamin D-fortified yogurt given to women with and without an increased risk of osteoporotic fracture. Methods: Avalidated cost-effectiveness microsimulation Markov model of osteoporosis management was used. Three personalized supplementation scenarios to reflect the Ca/Vit D needs taking into account the well-known variations in dietary habits and a possible pharmacological supplementation in Ca/ Vit D, given above or in combination with anti-osteoporosis medications: one yogurt per day, i.e., 400 mg of Ca+200 IU of Vit D (scenario 1 U), two yogurts per day, i.e., 800 mg of Ca+ 400 IU of Vit D (scenario 2 U), or three yogurts per day, i.e., 1, 200 mg of Ca+600 IU of Vit D (scenario 3 U). Results: One yogurt is cost-effective in the general population above the age of 70 years and in all age groups in women with low bone mineral density (BMD) or prevalent vertebral fracture (PVF). The daily intake of two yogurts is cost-effective above 80 years in the general population and above 70 years in the two groups of women at increased risk of fractures. However, an intake of three yogurts per day is only cost-effective above 80 years old in the general population, as well as in women with low BMD or PVF. Conclusions: Our study is the first economic analysis supporting the cost-effectiveness of dairy products, fortified with vitamin D, in the armamentarium against osteoporotic fractures. [less ▲]

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See detailVaricella paediatric hospitalisations in Belgium: a 1-year national survey.
Blumental, Sophie; Sabbe, Martine; Lepage, Philippe et al

in Archives of disease in childhood (2016), 101(1), 16-22

BACKGROUND: Varicella universal vaccination (UV) has been implemented in many countries for several years. Nevertheless, varicella UV remains debated in Europe and few data are available on the real ... [more ▼]

BACKGROUND: Varicella universal vaccination (UV) has been implemented in many countries for several years. Nevertheless, varicella UV remains debated in Europe and few data are available on the real burden of infection. We assessed the burden of varicella in Belgium through analysis of hospitalised cases during a 1-year period. METHODS: Data on children admitted to hospital with varicella were collected through a national network from November 2011 to October 2012. Inclusion criteria were either acute varicella or related complications up to 3 weeks after the rash. RESULTS: Participation of 101 hospitals was obtained, covering 97.7% of the total paediatric beds in Belgium. 552 children were included with a median age of 2.1 years. Incidence of paediatric varicella hospitalisations reached 29.5/10(5) person-years, with the highest impact among those 0-4 years old (global incidence and odds of hospitalisation: 79/10(5) person-years and 1.6/100 varicella cases, respectively). Only 14% (79/552) of the cohort had an underlying chronic condition. 65% (357/552) of children had >/=1 complication justifying their admission, 49% were bacterial superinfections and 10% neurological disorders. Only a quarter of children (141/552) received acyclovir. Incidence of complicated hospitalised cases was 19/10(5) person-years. Paediatric intensive care unit admission and surgery were required in 4% and 3% of hospitalised cases, respectively. Mortality among Belgian paediatric population was 0.5/10(6) and fatality ratio 0.2% among our cohort. CONCLUSIONS: Varicella demonstrated a substantial burden of disease in Belgian children, especially among the youngest. Our thorough nationwide study, run in a country without varicella UV, offers data to support varicella UV in Belgium. [less ▲]

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See detailDynamical thermalization in Bose-Hubbard systems
Schlagheck, Peter ULg; Shepelyansky, Dima L.

in Physical Review. E : Statistical, Nonlinear, and Soft Matter Physics (2016), 93

We numerically study a Bose-Hubbard ring of finite size with disorder containing a finite number of bosons that are subject to an on-site two-body interaction. Our results show that moderate interactions ... [more ▼]

We numerically study a Bose-Hubbard ring of finite size with disorder containing a finite number of bosons that are subject to an on-site two-body interaction. Our results show that moderate interactions induce dynamical thermalization in this isolated system. In this regime the individual many-body eigenstates are well described by the standard thermal Bose-Einstein distribution for well-defined values of the temperature and the chemical potential, which depend on the eigenstate under consideration. We show that the dynamical thermalization conjecture works well at both positive and negative temperatures. The relations to quantum chaos, quantum ergodicity, and the Åberg criterion are also discussed. [less ▲]

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See detailMultistep Reaction Telescoping
Monbaliu, Jean-Christophe ULg

Scientific conference (2016, January)

https://www.uhasselt.be/flow-chemistry-workshop-2016

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See detailRe-visiting plant plasma membrane lipids in tobacco: a focus on sphingolipids
Cacas, Jean Luc; Buré, Corinne; Grosjean, Kevin et al

in Plant Physiology (2016), 170

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See detailL'observation foncière en France, à Bruxelles et en Flandre
Hendrickx, Sébastien ULg; Sarciat, Jordane ULg; Halleux, Jean-Marie ULg

in Notes de recherche - Conférence Permanente du Développement Territorial Région Wallonne (2016), 64

Depuis quelques années, un intérêt accru se développe pour l’observation des marchés fonciers et la recherche de gisements fonciers, indispensables à une mise en œuvre efficace des politiques ... [more ▼]

Depuis quelques années, un intérêt accru se développe pour l’observation des marchés fonciers et la recherche de gisements fonciers, indispensables à une mise en œuvre efficace des politiques d’aménagement du territoire et des politiques sectorielles. La note de recherche n° 64 s’intéresse aux pratiques d’observation dans les territoires adjacents à la Wallonie et plus exactement aux outils développés en France, en Flandre et en Région de Bruxelles-Capitale. L’analyse de ces différents cas a mis en exergue l'avance évidente de nos voisins sur ces problématiques et permet d'apprécier l’utilité d’une connaissance territoriale accrue pour l’élaboration des stratégies de développement territorial et pour la prise de décision politique. Elle aboutit à diverses recommandations relatives à l’amélioration du système d’informations foncières et des politiques foncières en Wallonie. [less ▲]

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See detailDoes the Budyko curve reflect a maximum power state of hydrological systems? A backward analysis
Westhoff, Martijn ULg; Zehe, Erwin; Archambeau, Pierre ULg et al

in Hydrology and Earth System Sciences (2016), 20

Almost all catchments plot within a small envelope around the Budyko curve. This apparent behaviour suggests that organizing principles may play a role in the evolution of catchments. In this paper we ... [more ▼]

Almost all catchments plot within a small envelope around the Budyko curve. This apparent behaviour suggests that organizing principles may play a role in the evolution of catchments. In this paper we applied the thermodynamic principle of maximum power as the organizing principle. In a top-down approach we derived mathematical formulations of the relation between relative wetness and gradients driving runoff and evaporation for a simple one-box model. We did this in an inverse manner such that when the conductances are optimized with the maximum power principle, the steady state behaviour of the model leads exactly to a point on the asymptotes of the Budyko curve. Subsequently, we added dynamics in forcing and actual evaporations, causing the Budyko curve to deviate from the asymptotes. Despite the simplicity of the model, catchment observations compare reasonably well with the Budyko curves subject to observed dynamics in rainfall and actual evaporation. Thus by constraining the model with the asymptotes of the Budyko curve we were able to derive more realistic values of the aridity and evaporation index without any calibration parameter. Future work should focus on better representing the boundary conditions of real catchments and eventually adding more complexity to the model. [less ▲]

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See detailHysteresis identification using nonlinear state-space models
Noël, Jean-Philippe ULg; Esfahani, Alireza; Kerschen, Gaëtan ULg et al

in Proceedings of the International Modal Analysis Conference (IMAC) XXXIV (2016, January)

Most studies tackling hysteresis identification in the technical literature follow white-box approaches, i.e. they rely on the assumption that measured data obey a specific hysteretic model. Such an ... [more ▼]

Most studies tackling hysteresis identification in the technical literature follow white-box approaches, i.e. they rely on the assumption that measured data obey a specific hysteretic model. Such an assumption may be a hard requirement to handle in real applications, since hysteresis is a highly individualistic nonlinear behaviour. The present paper adopts a black-box approach based on nonlinear state-space models to identify hysteresis dynamics. This approach is shown to provide a general framework to hysteresis identification, featuring flexibility and parsimony of representation. Nonlinear model terms are constructed as a multivariate polynomial in the state variables, and parameter estimation is performed by minimising weighted least-squares cost functions. Technical issues, including the selection of the model order and the polynomial degree, are discussed, and model validation is achieved in both broadband and sine conditions. The study is carried out numerically by exploiting synthetic data generated via the Bouc-Wen equations. [less ▲]

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See detailNous sommes en direct.
Hamers, Jérémy ULg

Article for general public (2016)

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See detailComment je traite... la sténose aortique asymptomatique
MEURICE, Caroline ULg; DULGHERU, Raluca Elena ULg; PIERARD, Luc ULg

in Revue Médicale de Liège (2016), (71), 6-10

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See detailRobust Subspace Identification of a Nonlinear Satellite Using Model Reduction
Dossogne, Tilàn ULg; Noël, Jean-Philippe ULg; Kerschen, Gaëtan ULg

in Proceedings of the International Modal Analysis Conference (IMAC) XXXIV (2016, January)

The frequency-domain nonlinear subspace identification (FNSI) method has recently been successfully applied to large-scale nonlinear structures. One of the key features of FNSI is the nonlinear ... [more ▼]

The frequency-domain nonlinear subspace identification (FNSI) method has recently been successfully applied to large-scale nonlinear structures. One of the key features of FNSI is the nonlinear generalisation of the stabilisation diagram. However, as in linear system identification, the selection of the model order in the diagram is complicated by the presence of spurious poles, resulting from noise and modelling errors. Spurious poles have been shown to strongly perturb the estimation of the nonlinear coefficients. The present paper establishes a constructive procedure to discriminate between spurious and genuine poles. This procedure is derived in modal space and is based on a dominancy index and on model reduction techniques. It is demonstrated on a complete satellite structure possessing nonsmooth nonlinearities and high modal density. Spurious frequency variations in the nonlinear coefficients are proved to be effectively removed, significantly improving the quality of the overall identified model. [less ▲]

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See detailA Comparison of Reduced Order Modeling Techniques Used in Dynamic Substructuring
Roettgen, Daniel; Seeger, Benjamin; Tai, Wei Che et al

in Proceedings of the International Modal Analysis Conference (IMAC) XXXIV (2016, January)

Experimental dynamic substructuring is a means whereby a mathematical model for a substructure can be obtained experimentally and then coupled to a model for the rest of the assembly to predict the ... [more ▼]

Experimental dynamic substructuring is a means whereby a mathematical model for a substructure can be obtained experimentally and then coupled to a model for the rest of the assembly to predict the response. Recently, various methods have been proposed that use a transmission simulator to overcome sensitivity to measurement errors and to exercise the interface between the substructures; including the Craig-Bampton, Dual Craig-Bampton, and Craig-Mayes methods. This work compares the advantages and disadvantages of these reduced order modeling strategies for two dynamic substructuring problems. The methods are first used on an analytical beam model to validate the methodologies. Then they are used to obtain an experimental model for structure consisting of a cylinder with several components inside connected to the outside case by foam with uncertain properties. This represents an exceedingly difficult structure to model and so experimental substructuring could be an attractive way to obtain a model of the system. [less ▲]

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See detailCharacterizing the morphology of suburban settlements: a method based on a semi-automatic classification of building clusters
de Smet, Fabian; Teller, Jacques ULg

in Landscape Research (2016), 41(1), 113-130

Urban sprawl is transforming our landscapes and rural areas at a spectacular pace. Measuring the strength of the phenomenon and proposing dynamic ways to delineate suburban areas have been the object of ... [more ▼]

Urban sprawl is transforming our landscapes and rural areas at a spectacular pace. Measuring the strength of the phenomenon and proposing dynamic ways to delineate suburban areas have been the object of much debate amongst scientists. The present article takes the view that, beyond measuring and delineating suburban areas, more efforts should be directed to qualifying the morphology of built settlements within these areas. Therefore it proposes a method based on a semi-automatic classification system of building clusters, designed to describe and interpret the phenomenon from a morphological perspective. This method is based on a combination of field surveys with numerical analyses of digital land cadastre maps. The application of this classification system to the suburban area around Liege reveals that, far from developing in a complete indifference of local conditions, contemporary suburban settlements are influenced by landscape structures inherited from the past. [less ▲]

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See detailShaping Pulses to Control Bistable Systems: Analysis, Computation and Counterexamples
Sootla, Aivar ULg; Oyarzun, Diego; Angeli, David et al

in Automatica (2016), 63

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See detailReduction of the treatment gap for problematic alcohol use in Belgium
Mistiaen, Patriek; Kohn, Laurence; Mambourg, Françoise et al

Report (2016)

1.1 Background Alcohol consumption is a widespread phenomenon in western societies and it is a significant cause of morbidity and mortality. Problematic alcohol use affects an estimated 3.6% of the ... [more ▼]

1.1 Background Alcohol consumption is a widespread phenomenon in western societies and it is a significant cause of morbidity and mortality. Problematic alcohol use affects an estimated 3.6% of the population between 15 and 64 years of age worldwide. The Belgian health survey found that 10% of the Belgian population has a problematic alcohol use. However, only a small proportion of people with a problematic alcohol use seeks or receives treatment. A European study (including Belgium) found that only 8% of persons with an alcohol problem had consulted some form of professional assistance in the past year. A Belgian study found that 12.8% of persons with an alcohol use problem indicated they searched for help in the year after the problem started but 61% did so in later years with a mean delay of 18 years. So, many people who could profit from help/assistance do not seek or receive it and there is a long delay. It may be concluded that there is a large ‘treatment gap’. 1.2 Research aim To analyse explanations for the treatment gap and to find ways and interventions, including facilitators and barriers in applying these, to improve the treatment rate of people with problematic alcohol use in Belgium. 1.3 Methods This study applied 3 research approaches: • Review of the international and Belgian literature o Medline, EMBASE, Cochrane Library and Psychinfo and grey literature sources were searched in summer 2014 for review studies and for Belgian primary studies with date limit >2000 and written in English, Dutch, French or German o Literature was categorized into barriers/facilitators for seeking/starting treatment in individuals with problematic alcohol use, in care professionals and in society and into interventions for reducing the treatment in the mentioned three groups o Only descriptive analyses of the literature were appliedQualitative research by interviews with persons with an alcohol use problem (n=14), and interviews and focus groups with care professionals, and experts in the alcohol field (n=60) o To identify the factors on a personal, organisational and societal level that impede or facilitate the screening and advice given by professionals, initiation of treatment, and treatment-uptake by individuals with AUP; o To understand the complex interactions between those factors; o To identify the interventions/measures the surveyed individuals and professionals would consider effective in reducing the treatment gap from the point of view of the professionals and patients. • Delphi study with persons with an alcohol use problem, care professionals, policy makers and experts (total across groups n= 35) in the alcohol field to check acceptability and priority of recommendations for improvement of the treatment o Two rounds by online questionnaire were planned and a face to face meeting afterwards with Delphi-participants to discuss results of previous rounds and to reach final agreement 1.4 Results In the literature study 85 relevant reviews and 22 Belgian primary studies were included. It was found that individuals with AUP follow a long road before seeking help. Main barriers along the road are denial of the problem, belief that alcohol problems may improve on their own, desire to handle problems on their own, thinking that treatment is ineffective or uncomfortable, dislike of the prevalent group, fear of stigma, lack of financial resources and other. Next it was found that care professionals face also many barriers to initiate a kind of intervention; common mentioned barriers are lack of time and lack of knowledge and confidence. Also it appeared there is a societal/public stigma towards people with a problematic alcohol use, causing a barrier for affected persons to seek help. Several effective interventions targeted at easing patient barriers and help them to seek treatment or initiate behaviour change were found: Screening-brief interventions-referral to treatment (SBIRT) by health care professionals, internet based screening and awareness programs,stigma reducing interventions. Also a large amount of research was found to overcome these impediments. Main intervention for patients is making them aware of their problem, e.g. by screening on alcohol use and motivational brief interventions. Main interventions for professionals is to train and to motivate them to screen and give brief interventions; however, all reviews stated as well that there was a lot of diversity in training formats and intensity, making it difficult to synthetize the results and to define the optimum duration and format of such initiatives. Interventions at a societal level are less clear The qualitative study revealed that several barriers as well as facilitators are experienced by individuals with AUP and professionals. It appears that the treatment gap is a multiple phenomenon. Some elements are related to the individuals with an AUP, some others to the health professionals, and, more globally, in the socioeconomic context. Four main themes could be deduced from the interviews: individuals with AUP go through a long and stepped (however not always a linear) process before becoming aware of and recognising their problem; relatives (at home or in the social network) and colleagues (at work) play an important role along the persons’ trajectory; professionals lack the time, knowledge, skills and proper attitudes and they pass the buck when it comes to tackling the AUP; and the origin and treatment of AUP are largely influenced by societal habits and views. It appeared that more information is needed among the general population about alcohol-related problems and healthcare professionals’ knowledge on the topic, and the skills to manage it properly should be enhanced. In addition contextual and societal barriers have to be tackled. The Delphi-study resulted in a general consensus on all proposals, based on the literature and the qualitative study. But it was stressed that it is necessary to implement the proposals simultaneously to enhance synergy. 1.5 Conclusion The three research approaches confirmed each other and showed that the treatment gap for persons with problematic alcohol use is a multi-layered problem (individuals with AUP, their relatives, professionals, care system and general society). There are effective interventions to lower the treatment gap, but to obtain maximal effectiveness measures have to be taken at all levels in simultaneous way. [less ▲]

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See detailSmall-Angle Neutron Scattering investigation of cholesterol-doped DMPC liposomes interacting with β-cyclodextrin
Joset, Arnaud ULg; Grammenos, Angeliki; Hoebeke, Maryse ULg et al

in Journal of Inclusion Phenomena and Macrocyclic Chemistry (2016), 84(1), 153-161

The Small-Angle Neutron Scattering technique (SANS) has been applied to characterize the influence of a randomly methylated β–cyclodextrin (CD), called RAMEB, on dimyristoylphosphatidylcholine (DMPC ... [more ▼]

The Small-Angle Neutron Scattering technique (SANS) has been applied to characterize the influence of a randomly methylated β–cyclodextrin (CD), called RAMEB, on dimyristoylphosphatidylcholine (DMPC) liposomes doped with cholesterol. From the modelling of the experimental neutron scattering crosssections, the detailed response of the vesicle structure upon addition of increasing amounts of RAMEB up to 30 mM has been assessed. This study has been performed below and above the DMPC bilayer phase transition temperature and shows that cholesterol extraction by RAMEB is linked to a decrease of the average radius and of the aggregation number of the vesicles. This extraction takes place in a dose-dependent way until a more monodisperse population of cholesterol-free liposomes was obtained. In addition, the bilayer thickness evolution was inferred, as well as the liposome coverage by RAMEB. [less ▲]

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