References of "2011"
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See detailGéographie, tourisme et tourisme rural : une critique de quatre ouvrages
Dubois, Charline ULg

in Bulletin de la Société Géographique de Liège (2011), 57

Four books studying either tourism in a global sense or more specifically rural tourism, have been explored and subjected to some reviews: The Geography of Tourism and Recreation - Environment, Place and ... [more ▼]

Four books studying either tourism in a global sense or more specifically rural tourism, have been explored and subjected to some reviews: The Geography of Tourism and Recreation - Environment, Place and Space by C. Michael Hall and Stephen J. Page (2005), Rural Tourism and Sustainable Business by Derek Hall, Irene Kirkpatrick and Morag Mitchell (2005), Tourism and tourism spaces by Gareth Shaw and Allan M. Williams (2004), and Rural Tourism and Recreation: Principles to Practice by Lesley Roberts and Derek Hall (2001). After the step of synthesis of each one, their own developments and their utilities will be discussed. [less ▲]

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See detailYBa2Cu3O7−x dispersion in iodine acetone for electrophoretic deposition: Surface charging mechanism in a halogenated organic media
Dusoulier, Laurent; Cloots, Rudi ULg; Vertruyen, Bénédicte ULg et al

in Journal of the European Ceramic Society (2011), 31

Electrophoretic deposition (EPD) performance strongly depends on the particles surface chemistry and the ability to manipulate surface–liquid interfaces. In this study an extensive investigation of YBCO ... [more ▼]

Electrophoretic deposition (EPD) performance strongly depends on the particles surface chemistry and the ability to manipulate surface–liquid interfaces. In this study an extensive investigation of YBCO suspension in dry acetone, acetone–water mixtures and acetone–iodine is reported. Chemical instability of YBCO particles determines their colloidal behaviour. Charging mechanism of particles has therefore had to be deeply investigated for complete dispersion understanding. In order to determine the conditions of the YBCO suspension stability, measurements of pH, conductivity, zeta-potential, settling tests, modelling of the particle networks and electrophoretic deposition were done. The influence of the water and iodine concentration, and their role as stabilizers was evaluated. Based on experimental results, pair particle potentials were calculated and then different charging mechanisms of YBCO surfaces in acetone were proposed. [less ▲]

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See detailDO PLACEBO BASED VALIDATION STANDARDS MIMIC REAL BATCH PRODUCTS BEHAVIOUR? CASE STUDIES
Bouabidi, A.; Talbi, M.; Bouklouze, A. et al

in Journal of Pharmaceutical & Biomedical Analysis (2011), 55

Analytical methods validation is a mandatory step to evaluate the ability of developed methods to provide accurate results for their routine application. Validation usually involves validation standards ... [more ▼]

Analytical methods validation is a mandatory step to evaluate the ability of developed methods to provide accurate results for their routine application. Validation usually involves validation standards or quality control samples that are prepared in placebo or reconstituted matrix made of a mixture of all the ingredients composing the drug product except the active substance or the analyte under investigation. However, one of the main concerns that can be made with this approach is that it may lack an important source of variability that come from the manufacturing process. The question that remains at the end of the validation step is about the transferability of the quantitative performance from validation standards to real authentic drug product samples. In this work, this topic is investigated through three case studies. Three analytical methods were validated using the commonly spiked placebo validation standards at several concentration levels as well as using samples coming from authentic batch samples (tablets and syrups). The results showed that, depending on the type of response function used as calibration curve, there were various degrees of differences in the results accuracy obtained with the two types of samples. Nonetheless the use of spiked placebo validation standards was showed to mimic relatively well the quantitative behaviour of the analytical methods with authentic batch samples. Adding these authentic batch samples into the validation design may help the analyst to select and confirm the most fit for purpose calibration curve and thus increase the accuracy and reliability of the results generated by the method in routine application. [less ▲]

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See detailContrasted views on environmental migration: the case of Tuvaluan migration to New Zealand
Shen, Shawn; Gemenne, François ULg

in International Migration (2011), 49

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See detailLe centre, les planètes et la noirceur : Controverses cosmiques et terrestres
Nazé, Yaël ULg

Article for general public (2011)

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See detailInfluence of the alveoli slopes on the discharge capacity of Piano Key Weirs
Machiels, Olivier ULg; Erpicum, Sébastien ULg; Archambeau, Pierre ULg et al

in Proceedings of the 34th IAHR world congress (2011)

Piano Key Weir is a cost effective solution for rehabilitation as well as for new dam project with a high level of constraints (space, flood discharge, reservoir level).If the efficiency of the Piano Key ... [more ▼]

Piano Key Weir is a cost effective solution for rehabilitation as well as for new dam project with a high level of constraints (space, flood discharge, reservoir level).If the efficiency of the Piano Key Weir has already been well demonstrated, the definition of its optimal geometry has been still poorly approached. In order to improve the design of the complex geometry of this structure, the study of the influence of the mean geometrical parameters on the discharge capacity is an essential stage. Following a former experimental study of the flow over Piano Key Weirs, highlighting the mean influence of three geometrical parameters, this paper presents the results of an experimental parametric study. These results highlight the influence of the alveoli bottom slopes on the Piano Key Weir release capacity. Comparisons with numerical and analytical results, as well as design advices are also provided. [less ▲]

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See detailImprovement of the UNIQUAC combinatorial-entropy term by adjusting the standard segment
Bronneberg, Rob; Pfennig, Andreas ULg

in Journal of Chemical & Engineering Data (2011), 56

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See detailField trip 1: Givetian and Frasnian of Southern Belgium
Boulvain, Frédéric ULg; Coen-Aubert, Marie; Da Silva, Anne-Christine ULg et al

in Kölner Forum für Geologie und Paläontologie (2011), 20

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See detailDéveloppement de la reconnaissance des mots écrits et représentations mentales : l’approche de la psycholinguistique cognitive
Quemart, Pauline ULg; Janiot, Marion; Casalis, Séverine et al

in Bault, Nadège; Chambon, Valérian; Maïonchi-Pino, Norbert (Eds.) et al Peut-on se passer de représentations en sciences cognitives ? (2011)

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See detailGait feature extraction in Parkinson's disease using low-cost accelerometers
Stamatakis, Julien; Cremers, Julien ULg; Maquet, Didier ULg et al

Poster (2011)

The clinical hallmarks of Parkinson’s disease (PD) are movement poverty and slowness (i.e. bradykinesia), muscle rigidity, limb tremor or gait disturbances. Parkinson’s gait include slowness, shuffling ... [more ▼]

The clinical hallmarks of Parkinson’s disease (PD) are movement poverty and slowness (i.e. bradykinesia), muscle rigidity, limb tremor or gait disturbances. Parkinson’s gait include slowness, shuffling, short steps, freezing of gait (FoG) and/or asymmetries in gait. There are currently no validated clinical instruments or device that allow a full characterization of gait disturbances in PD. As a step towards this goal, a four accelerometer-based system is proposed to increase the number of parameters that can be extracted to characterize parkinsonian gait disturbances such as FoG or gait asymmetries. After developing the hardware, an algorithm has been developed, that automatically epoched the signals on a stride-by-stride basis and quantified, among others, the gait velocity, the stride time,the stance and swing phases, the single and double support phases or the maximum acceleration at toe-off, as validated by visual inspection of video recordings during the task. The results obtained in a PD patient and an healthy volunteer are presented. The FoG detection will be improved using time-frequency analysis and the system is about to be validated with a state-of-the-art 3D movement analysis system. [less ▲]

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See detailSimulations numériques de figures de diffractions à l'usage de la sixième secondaire et du premier baccalauréat
Leblanc, Christophe ULg

in Bulletin de l'Association Belge des Professeurs de Physique et de Chimie [Bulletins de l'ABPPC] (2011), 49(190),

La diffraction constitue de nos jours un phénomène physique incontournable pour la recherche (diffraction par rayons X, diffraction de neutrons, cristallographie, ...) et est, à juste titre, enseignée ... [more ▼]

La diffraction constitue de nos jours un phénomène physique incontournable pour la recherche (diffraction par rayons X, diffraction de neutrons, cristallographie, ...) et est, à juste titre, enseignée aussi bien en dernière année de secondaire qu'à l'université. Le logiciel présenté ci-dessous est un programme permettant de réaliser des figures de diffractions de manière simple et intuitive. Il existe naturellement déjà de nombreux programmes de simulations de figures de diffractions que l'on peut facilement trouver sur internet. Cependant ceux-ci sont, pour la plupart, ou bien limités (à la connaissance de l'auteur) à quelques cas particuliers - diffractions sur une ou plusieurs fentes, un rond, plus rarement un carré - ou bien complexes à l'utilisation. Bien que ces programmes soient dignes d'intérêts et peuvent se montrer utiles dans le cadre d'un enseignement, leurs limitations empêchent d'acquérir une intuition réelle de ce qu'est la diffraction. Par exemple, quelle est la figure de diffraction obtenue par un réseau cristallin cubique, un réseau hexagonal, ou encore une hélice ? C'est précisément cette faille pédagogique que vient combler le logiciel présenté ci-dessous. En effet, celui-ci permet d'obtenir la figure de diffraction de « n'importe quelle forme » (en deux dimensions), « forme » entièrement paramétrable par l'utilisateur au moyen d'un simple fichier bitmap ; format de fichier graphique le plus répandu et le plus simple à employer. Il est naturellement également possible d'effectuer de la diffraction de manière expérimentale au moyen d'un simple laser hélium-néon (facilement accessible dans le commerce et d'un prix modéré) et de diapositives. Cependant, outre que le logiciel présenté ci-dessous peut-être obtenu gratuitement par simple demande à l'auteur, celui-ci se montre beaucoup plus souple d'utilisation que de simples diapositives car entièrement paramétrable, et, comme tout logiciel, échappe aux aléas expérimentaux (poussières sur les diapositives, problèmes d'alignements diapositives-laser, nécessité d'un local sombre, ...) [less ▲]

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See detailThe Producerist Narrative in Right-wing Flanders
Jamin, Jérôme ULg

Conference (2011)

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See detailDescription of the bone-remodeling pattern after socket preservation procedures in human: a methodological study
LAMBERT, France ULg; VINCENT, Kim ULg; VANHOUTTE, Vanessa ULg et al

Poster (2011)

Background: The bone remodeling after tooth extraction can result in the loss of as much as 50% of the buccal wall and a global crestal reduction in width of 3.87mm according to a recent systematic review ... [more ▼]

Background: The bone remodeling after tooth extraction can result in the loss of as much as 50% of the buccal wall and a global crestal reduction in width of 3.87mm according to a recent systematic review. Multiple surgical protocols using biomaterials are proposed in order to limit the typical postextraction bone resorption. However, because of the heterogeneity of the studies and, more specifically, of the assessment methods, it is difficult to assert the superiority of one technique over another. Aim: The objective of this study was to develop a new radiographic method to assess alveolar bone remodeling after socket preservation procedures. Methods: Sixteen extraction sites (in 14 patients) localized in the upper anterior maxilla were treated with bovine hydroxyapatite (0.25–1mm particles) and a saddled connective tissue graft. A radiographic 3-dimensional assessment of the hard tissues was performed at baseline and at 3 months after the procedure. Standardized horizontal measurements were taken at three corono apical levels ( 2, 5, and 9mm) and at three mesio-diatal level (Mesial, Center, and Distal) in the buccal and palatal aspects. Vertical measurements were also recorded in nine regions over the top of the alveolar crest. Results: Extraction socket-preservation technique assessed in the present study significantly reduced horizontal bone remodeling. The horizontal dimension of the crest decreased by 1.6mm (20%) in the cervical regions ( 2mm level), experienced a moderate decrease of 1mm (12%) at the 5mm level, and experienced a very low decrease of 0.5mm(6%) in the apical ( 8mm) level. The losses were always significantly higher in the buccal than in the palatal aspect. Buccally, the maximal bone remodeling at the cervical level remained below 1mm. Vertical bone resorption was homogeneous and was < 1mm in the nine measured regions. Conclusions and clinical implications: The radiographic measuring methodology proved to be accurate and reproducible. It can be applied in other clinical settings. Moreover, the surgical procedure evaluated in the present study, significantly limits the postextraction buccal bone remodeling compared with the data found in the literature for untreated extraction socket in the aesthetic area. However, a complete inhibition of the bone remodeling was not reached and the authors suggest a surgical technique using a ‘‘saddled’’ connective tissue graft to thicken buccal soft tissue biotype and consequently compensate for cervical bone loss. [less ▲]

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See detailApplication de l’optique non-linéaire à l’analyse des interactions peptide-monocouches à l’interface air-eau
Nasir, Mehmet Nail ULg; Benichou, Emmanuel; Brevet, Pierre-François et al

Scientific conference (2011)

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See detailEffects of Temperature and Relative Humidity on the In Vitro and In Vivo Radial Growth of Penicillium italicum and on the Biocontrol Activity of Pichia guilliermondii, Strain Z1
El Guilli, M.; Ibriz, M.; Lahlali, Rachid et al

in Acta Horticulturae (2011), 905

The objective of this study was to assess the effect of temperature (5-25°C) on the ‘in vitro’ and ‘in vivo’ growth rates of Penicillium italicum and to determine the combined effect of temperature and ... [more ▼]

The objective of this study was to assess the effect of temperature (5-25°C) on the ‘in vitro’ and ‘in vivo’ growth rates of Penicillium italicum and to determine the combined effect of temperature and relative humidity (45 to 100%) on lesion size of this pathogenic fungus on Valencia late oranges, either alone or in combination with the antagonistic yeast strain Z1 of Pichia guilliermondii Wickerham. Statistical analysis showed a significant effect of temperature on the ‘in vitro’ and ‘in vivo’ radial growth of P. italicum with the maximum growth observed at temperature of 25°C. In both cases, no growth was observed at a temperature of 35°C. These factors had a significant effect on P. italicum lesion size when it was applied alone on Valencia late oranges and insignificant when yeast strain Z1 was applied 24 h before P. italicum inoculation. Our results confirm previous ‘in vitro’ findings that aw has a greater influence than temperature on P. italicum growth and highlight that the strain Z1 showed high antagonistic potential against this pathogen over a range of temperature-relative humidity regimes favouring P. italicum development. [less ▲]

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See detailCompetitive facility location problem with attractiveness adjustment of the follower: A bilevel programming model and its solution
Kucukaydin, Hande ULg; Aras, Necati; Altinel, I. Kuban

in European Journal of Operational Research (2011), 208(3), 206-220

We are concerned with a problem in which a firm or franchise enters a market by locating new facilities where there are existing facilities belonging to a competitor. The firm aims at finding the location ... [more ▼]

We are concerned with a problem in which a firm or franchise enters a market by locating new facilities where there are existing facilities belonging to a competitor. The firm aims at finding the location and attractiveness of each facility to be opened so as to maximize its profit. The competitor, on the other hand, can react by adjusting the attractiveness of its existing facilities with the objective of maximizing its own profit. The demand is assumed to be aggregated at certain points in the plane and the facilities of the firm can be located at predetermined candidate sites. We employ Huff's gravity-based rule in modeling the behavior of the customers where the fraction of customers at a demand point that visit a certain facility is proportional to the facility attractiveness and inversely proportional to the distance between the facility site and demand point. We formulate a bilevel mixed-integer nonlinear programming model where the firm entering the market is the leader and the competitor is the follower. In order to find the optimal solution of this model, we convert it into an equivalent one-level mixed-integer nonlinear program so that it can be solved by global optimization methods. Apart from reporting computational results obtained on a set of randomly generated instances, we also compute the benefit the leader firm derives from anticipating the competitor's reaction of adjusting the attractiveness levels of its facilities. The results on the test instances indicate that the benefit is 58.33% on the average. [less ▲]

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See detailExposition
Desvallées, André; Schärer, Martin; Drouguet, Noémie ULg

in Mairesse, François; Desvallées, André (Eds.) Dictionnaire encyclopédique de muséologie (2011)

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See detail1D numerical modeling of the flow over a Piano Key Weir
Erpicum, Sébastien ULg; Machiels, Olivier ULg; Archambeau, Pierre ULg et al

in Erpicum, Sébastien; Laugier, Frédéric; Boillat, Jean Louis (Eds.) et al Labyrinth and Piano Key Weirs - PKW 2011 (2011)

Because of the PK-Weir geometric specificities, its hydraulic capacity remains difficult to predict without using experimental techniques. A 1D numerical model of the flow over a PK-Weir has been ... [more ▼]

Because of the PK-Weir geometric specificities, its hydraulic capacity remains difficult to predict without using experimental techniques. A 1D numerical model of the flow over a PK-Weir has been developed at the Research unit HACH at the University of Liege. It is based on a 1D modeling of the inlet and the outlet separately, with a single upstream reservoir and interactions between both flows by exchange of mass and momentum along the lateral crest. The comparison of the numerical results with various experimental data showed the ability of the numerical model to predict with reasonable accuracy the release capacity of a PK-Weir, whatever its geometry. The tests of the solver enable to highlight the significant influence of the inlet and outlet width on the weir release capacity. They also suggest that improvements of the numerical model may lie in the evaluation of the discharge coefficient of the lateral crest. [less ▲]

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