References of "Scientific congresses and symposiums"
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See detailFunctional refractory molds for metal casting built by additive manufacturing
Bister, Geoffroy; Hautcoeur, Dominique; Deschuyteneer, Dorian et al

Conference (2017, July)

Additive manufacturing is more and more used in the field of industry. This technique is notably employed in investment casting process in order to build cores and models. Nevertheless investment casting ... [more ▼]

Additive manufacturing is more and more used in the field of industry. This technique is notably employed in investment casting process in order to build cores and models. Nevertheless investment casting remains not cost effective in case of prototypes and very small series due to the quite large amount time needed to build and dry the molds. Additive manufacturing may also be used to directly shape metal parts but several problems are still linked to this technique as the presence of local defects in parts and the limitation of the number of metal or alloy available for this technique on the market. We propose an intermediate method that permits to build directly molds and cores by additive manufacturing using equipment initially dedicated to build metal parts. This method presents the main advantage to cast with a large variety of metals or alloys using a single ceramic material and only one set of building conditions. The properties of the casted parts are very similar with those produced by investment casting. This technique also permits the unique advantage to control the design of the shell thickness and structure in order to have a better control of the thermal fluxes during metal cooling. This would potentially ensure a better control of some casting defects. The use of alumina processed by selective laser melting (SLM) is shown and its outstanding resistance to temperature differential is demonstrated through casting trials with two diffferent representative alloys. Casting trials in industrial conditions will be illustrated. [less ▲]

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See detailRECONSTRUCTION DE L'ÉVOLUTION DU RAYONNEMENT SOLAIRE REÇU EN SURFACE EN EUROPE OCCIDENTALE SUR LA PÉRIODE 1900-2014 À L'AIDE DU MODÈLE ATMOSPHÉRIQUE RÉGIONAL MAR
Wyard, Coraline ULg; Fettweis, Xavier ULg; Belleflamme, Alexandre ULg et al

in Dahech, Salem; Charfi, Sami (Eds.) Actes du XXXe colloque de l'Association Internationale de Climatologie : Climat, ville et environnement (2017, July)

Many studies show that the surface solar radiation has underwent large variations over the second half of the 20th century as a result of variations in cloud cover and aerosol loading in the atmosphere ... [more ▼]

Many studies show that the surface solar radiation has underwent large variations over the second half of the 20th century as a result of variations in cloud cover and aerosol loading in the atmosphere. However, it is difficult to build strong conclusions before the 1950' because of the observations scarcity. The evolution of the surface solar radiation has been reconstructed over 1900-2014 using the regional model MAR (« Modèle Atmosphérique Régional ») in Belgium. Boundary conditions were provided by four reanalysis products : the ERA-interim (1979-2014) completed by the ERA40 (1958-1978), the NCEP/NCAR-v1 (1948-2014), the ERA-20C (1900-2010) and the 20CRV2C (1900-2010). Results show that the reanalyses can generate divergent trends while they assimilate observations and are supposed to represent the same climate. [less ▲]

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See detailThe grammaticalization of Russian taxonomic nouns
Kolyaseva, Alena ULg

Conference (2017, July)

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See detailHydro-mechanical modelling of a coalbed methane production well via a dual-porosity approach
Bertrand, François ULg; Buzzi, Olivier; Collin, Frédéric ULg

in Book of Abstracts: 6th International Conference on Coupled THMC Processes in Geosystems (2017, July)

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See detailFish learned movements in a large regulated river
Capra, Hervé; Pella, Hervé; Ovidio, Michaël ULg et al

Conference (2017, July)

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See detailImpact of Diesel generator limitations in the robust sizing of isolated hybrid Microgrids including PV and batteries
Balderrama Subieta, Sergio Luis ULg; Canedo, Walter; Lemort, Vincent ULg et al

in Proceedings of ECOS 2016 - the 30th International Conference on Efficiency, Cost, Optimization, Simulation and Environmental Impact of Energy Systems (2017, July)

The recent developments in PV and Lion-ion batteries along with the maturity of gensets technology to provide energy to isolated systems has fostered the use of hybrid micro-grids for rural ... [more ▼]

The recent developments in PV and Lion-ion batteries along with the maturity of gensets technology to provide energy to isolated systems has fostered the use of hybrid micro-grids for rural electrification. In this context, the optimal coupling of different technologies and the minimization of the cost to the final consumer are the objects of a number of previous researches. However, the approach usually relies on deterministic linear programming optimizations (LP), which do not allow to model certain non-linearities and limitations of the components. This paper aims at filling this gap by proposing an optimization of such system, with a detailed representation of each component. The case study of an isolated village (Las Misiones, Bolivia) with a peak electricity consumption of 9.2 MW is analyzed. The considered system comprises a diesel generator; a PV array and Li-Ion batteries whose nominal capacities should be optimized. A robust optimization tool is first proposed with an LP formulation and the net present cost as objective function. The basic model is then modified to take into account more complex operating characteristics of a gen-set operating in part-load. To that aim, the LP problem is changed into a mixed integer linear programing formulation. Results indicate that the more detailed constraints influence the final design of the system and negatively impact the total cost. [less ▲]

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See detailLanguage and analogical reasoning in children with Specific Language Impairment: The effect of articulatory suppression
Krzemien, Magali ULg; Thibaut, Jean-Pierre; Stoffels, Valentine ULg et al

Poster (2017, July)

Analogical reasoning shares a mutual influence with language development: analogical reasoning is improved by labelling analogical items with words describing the relations that they contain. Conversely ... [more ▼]

Analogical reasoning shares a mutual influence with language development: analogical reasoning is improved by labelling analogical items with words describing the relations that they contain. Conversely, structural alignment, a core mechanism of analogical reasoning, allows the acquisition of novel words and the development of grammar (Gentner, 2010). Given those findings, some authors have taken interest in the analogical reasoning ability of children with language disorders, and specifically of children with Specific Language Impairment (SLI). Those children have worse performance than their age-matched peers without language disorders in linguistic or non-linguistic analogical tasks (Leroy, Maillart, & Parisse, 2014). Our aim here is to see if this weakness is due to their language disorders and if they use the same verbal strategies as their peers to solve an analogical task. To experience these assumptions, we use a perceptual analogical task following an A:B::C:D paradigm: participants have to find the relation between two geometric forms A and B and to apply it to the C term in order to find the D term among distractors. The distractors either share perceptual features with the C term, what creates a competition that shall be inhibited, or not. Moreover, children are faced with three interfering task conditions: one without any interfering task, one with an articulatory suppression secondary task and one with a tapping secondary task, which is used in order to measure the general dual task demands. Comparing the results of these conditions will allow us to evaluate the impact of language and verbal strategies on analogical reasoning in control and SLI children. [less ▲]

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See detailFish habitat selection in a large hydropeaking river: strong individual and temporal variations revealed by telemetry
Plichard, Laura; Capra, Hervé; Pella, Hervé et al

Conference (2017, July)

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See detailThe question of the methane increase through the retrieval of its isotopologues from FTIR ground-based observations
Bader, Whitney ULg; Strong, Kimberley; Walker, Kaley

Poster (2017, July)

Methane (CH4) is the second most important greenhouse gas emitted by human activities in the Earth’s atmosphere. Although it is roughly 200 times less abundant than carbon dioxide, it is a 28 times more ... [more ▼]

Methane (CH4) is the second most important greenhouse gas emitted by human activities in the Earth’s atmosphere. Although it is roughly 200 times less abundant than carbon dioxide, it is a 28 times more potent greenhouse gas. Approximately one fifth of the changes in the Earth’s balance energy caused by human-linked greenhouse gases since the beginning of industrialization (~1750) is due to methane. Methane is emitted by both natural sources and human activities. Indeed, methane can be emitted to the atmosphere through coal mining, oil and gas exploitation, rice cultures, domestic ruminant animals, biomass burning, waste management, wetlands, termites, methane hydrates and ocean. Since the beginning of the industrialization, atmospheric methane concentrations have increased by 260% to reach 1824 pbb in 2013. From the 1980s until the beginning of the 1990s, atmospheric methane was significantly on the rise, then stabilized during 1999-2006 to rise again afterwards. To this day, the source or sink responsible of this latter increase remains unexplained. Through each emission process, heavy molecules of methane (with one additional neutron either on a carbon or on one hydrogen atom) are emitted along methane (12CH4). The main heavy molecules of methane, called isotopologues (13CH4 and CH3D), are respectively ~110 and ~60 000 times less abundant than methane. Despite their small abundances, they give crucial information on the concentration of methane in the atmosphere and its evolution. Indeed, both isotopologues are emitted with specific emission ratio depending on the emission sources. Determining isotopic ratio of atmospheric methane is therefore a unique tracer of its budget. While the non-monotonous trend of methane is subject of an extensive number of studies, to our knowledge, no study of the isotopic ratio of methane derived from ground-based solar observations has been published to date. Measurements of heavy methane from Fourier Transform InfraRed spectra recorded with state of the art spectrometers installed at Eureka [Arctic, Canada] and Toronto [Ontario, Canada] will help fill this gap. Indeed, the produced time series will ease data interpretation and contribute to a global view of the question of isotopologues. [less ▲]

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See detailWEATHERING ON THE DEVONIAN SLATES AND CHARACTERIZATION OF A BENTONITE LAYER IN THE WESTERWALD (GERMANY)
Fontaine, François ULg; Hamaekers, Helen; Hoffmann, Andreas et al

Conference (2017, July)

The Westerwald region is one of the largest and oldest clay mining areas of Germany. Those deposits were formed during the Eocene and Oligocene as a result of the weathering, erosion and redeposition of ... [more ▼]

The Westerwald region is one of the largest and oldest clay mining areas of Germany. Those deposits were formed during the Eocene and Oligocene as a result of the weathering, erosion and redeposition of Devonian rocks. During the Miocene, intense volcanic activities led to a large basalt cover, protecting the clays from the erosion. The two main goals of this study are first to improve the knowledge on the weathering processes of the Devonian slates that led to the current setting of those clay deposits by studying the mineralogical and chemical composition of the clays with depth. The second goal is to characterize a bentonite layer underneath the Miocene basalt cover using quantitative X-ray diffraction, chemical analysis, BET, cation exchange capacity and scanning electron microscope. A 20 meter deep quarry mining the Devonian bedrock in southern Westerwald has been sampled on its entire depth. The XRD results show no significant variations of the mineralogy with depth, except for the phyllosilicates. The minerals of the < 2 μm fraction are illite, kaolinite, smectite and mixed-layers minerals (vermiculite-chlorite and illite-chlorite). The proportions of the minerals in the mixed-layers chlorite-vermiculite vary with depth. At the bottom of the quarry, the proportion of vermiculite is very low while in the top, the proportion of vermiculite is higher. This is explained by the degree of the weathering, logically more intense at the top of the quarry. Trace elements compositions are currently being investigated. A 3 meter thick greenish to brownish bentonite layer has been found in the eastern part of the Westerwald region. The XRD performed on different samples of this bentonite shows a relatively heterogeneous composition: montmorillonite (60-80%), kaolinite (5-12%), illite (0-7%), goethite (2-15%), talc (0-10%), K-feldspars (0-7%), plagioclase (0-4%) and traces of amphibole and pyroxene. This bentonite is probably the result of the weathering of volcanic ashes. Since there are not many outcrops of this bentonite layer, its spatial distribution is studied by drilling. [less ▲]

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See detailEarly detection of university students with potential difficulties
Hoffait, Anne-Sophie ULg; Schyns, Michael ULg

Conference (2017, July)

Using data mining methods, this paper presents a new means of identifying freshmen's profiles likely to face major difficulties to complete their first academic year. We aim at early detection of ... [more ▼]

Using data mining methods, this paper presents a new means of identifying freshmen's profiles likely to face major difficulties to complete their first academic year. We aim at early detection of potential failure using student data available at registration, i.e. school records and environmental factors, with a view to timely and efficient remediation and/or study reorientation. We adapt three data mining methods, namely random forest, logistic regression and artificial neural network algorithms. We design algorithms to increase the accuracy of the prediction when some classes are of major interest. These algorithms are context independent and can be used in different fields. They rely on a dynamic split of the observations into subclasses during the training process, so as to maximize an accuracy criterion. Four classes are so built: high risk of failure, risk of failure, expected success or high probability of success. Real data pertaining to undergraduates at the University of Liège (Belgium), illustrates our methodology. With our approach, we are now able to identify with a high rate of confidence (90%) a subset of 12.2% of students facing a very high risk of failure, almost the quadruple of those identified with a non-dynamic approach. By testing some confidence levels, our approach makes it possible to rank the students by levels of risk and a sensitivity analysis allows us to find out why some students are likely to encounter difficulties. [less ▲]

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See detailOptimising workforce and energy costs by exploiting production flexibility
Cuvelier, Thibaut ULg; Louveaux, Quentin ULg

Conference (2017, July)

In a world where the electricity prices become more and more volatile, notably due to renewable energies, the industry is suffering from cost variations never seen before, especially when electro ... [more ▼]

In a world where the electricity prices become more and more volatile, notably due to renewable energies, the industry is suffering from cost variations never seen before, especially when electro-intensive. Nevertheless, the plants can significantly reduce this impact: some electro-intensive factories could shift their production to time periods where the electricity is cheaper, resulting in large savings. At the same time, the grid operator can remunerate this consumption adaptation as a flexibility service. Our research goal is to optimise the operations of a factory around this flexibility. We compute a production plan that adapts to price forecasts, but also flexibility levers that adjust this plan to react to unexpected price changes. We propose the unifying concept of reservoir to provide sufficiently good models for the plant's processes. Nevertheless, this methodology implies to have frequent production plan changes, which directly impacts the workers, as they may be asked to follow barely predictable schedules. This has a significant detrimental effect on their quality of life. As a consequence, the human aspect of flexibility must also be considered: we seek for production plans that consider both workforce and energy costs, and we then assign workers to work shifts while ensuring their well-being. This HR orientation is the most innovative contribution of this research project. [less ▲]

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See detailReinforcement Learning for Electric Power System Decision and Control: Past Considerations and Perspectives
Glavic, Mevludin ULg; Fonteneau, Raphaël ULg; Ernst, Damien ULg

in The 20th World Congress of the International Federation of Automatic Control, Toulouse 9-14 July 2017 (2017, July)

In this paper, we review past (including very recent) research considerations in using reinforcement learning (RL) to solve electric power system decision and control problems. The RL considerations are ... [more ▼]

In this paper, we review past (including very recent) research considerations in using reinforcement learning (RL) to solve electric power system decision and control problems. The RL considerations are reviewed in terms of speci c electric power system problems, type of control and RL method used. We also provide observations about past considerations based on a comprehensive review of available publications. The review reveals the RL is considered as viable solutions to many decision and control problems across di erent time scales and electric power system states. Furthermore, we analyse the perspectives of RL approaches in light of the emergence of new-generation, communications, and instrumentation technologies currently in use, or available for future use, in power systems. The perspectives are also analysed in terms of recent breakthroughs in RL algorithms (Safe RL, Deep RL and path integral control for RL) and other, not previously considered, problems for RL considerations (most notably restorative, emergency controls together with so-called system integrity protection schemes, fusion with existing robust controls, and combining preventive and emergency control). [less ▲]

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See detailGood practices in adapted physical activity for cancer patients and survivors: opinion of the Raviva program participants
Rompen, Jérôme ULg; Scharff, Jules; Cloes, Marc ULg

Conference (2017, July)

Introduction The Belgian Foundation against Cancer proposes an adapted physical activity (APA) program for cancer patients and survivors, called Raviva (http://www.cancer.be/raviva-bouger-pour-se-sentir ... [more ▼]

Introduction The Belgian Foundation against Cancer proposes an adapted physical activity (APA) program for cancer patients and survivors, called Raviva (http://www.cancer.be/raviva-bouger-pour-se-sentir-mieux).The activities are supervised by instructors with inconstant trainings and experiences. Contrary to other countries, Belgian APA instructors do not necessarily need to follow specific education programs such those proposed by the ACSM (Schmitz et al., 2010) or other organizations that propose exercise guidelines for cancer survivors. The aim of this study was to identify good practices in APA for cancer patients and survivors concerning activity characteristics and instructors behaviors, from the point of view of the Raviva program participants. Methods Firstly, an online questionnaire was submitted to Raviva participants; 72 of them filled it in. Secondly, 3 video-stimulated recall interviews were conducted after 3 different Raviva sessions (fitness, yoga and aqua-aerobics), each time with another participant. Results and discussion The sessions characteristics that participants like the most are related to the choice and quality of the proposed exercises (22% of responses) and to the perceived benefits of the activities (20%). The most appreciated qualities for an instructor are related to his/her human qualities (43%) and his/her expertise (32%). What participants like least about the sessions is a poor organization (27%) and what they like least about the instructors is linked to bad choices of exercises (18%). The video-stimulated recall interviews confirmed these data and provided more precision. Finally, we noticed that differences in responses were observed depending on the type of activity participants took part in. These findings could help instructors adapt their practices to their participants’ needs in order to promote adherence to physical activity among this population. References Schmitz, K. H., Courneya, K. S., Matthews, C., Demark-Wahnefried, W., Galvão, D. a, Pinto, B. M., … Schwartz, A. L. (2010). American College of Sports Medicine roundtable on exercise guidelines for cancer survivors. Medicine and Science in Sports and Exercise, 42(7), 1409‑26. https://doi.org/10.1249/MSS.0b013e3181e0c112 [less ▲]

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See detailDevelopment of an Ericsson Heat Engine for biomass Combined Heat and Power
Oudkerk, Jean-François ULg; Lemort, Vincent ULg

in Proceedings of the 30th International conference on Efficiency, Cost, Optimization, Simulation and Environmental Impact of Energy Systems (ECOS) (2017, July)

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See detailcopycat: Testing Differential Treatment of New Transport Protocols in the Wild
Edeline, Korian ULg; Kühlewind, Mirja; Trammell, Brian et al

in Applied Networking Research Workshop (2017, July)

Recent years have seen the development of multiple transport solutions to address the ossification of TCP in the Internet, and to ease transport-layer extensibility and deployability. Recent approaches ... [more ▼]

Recent years have seen the development of multiple transport solutions to address the ossification of TCP in the Internet, and to ease transport-layer extensibility and deployability. Recent approaches, such as PLUS and Google's QUIC, introduce an upper transport layer atop UDP; their deployment therefore relies on UDP not being disadvantaged with respect to TCP by the Internet. This paper introduces copycat, a generic transport protocol testing tool that highlights differential treatment by the path in terms of connectivity and QoS between TCP and a non-TCP transport protocol. copycat generates TCP-shaped traffic with custom headers, and compares its performance in terms of loss and delay with TCP. We present a proof-of-concept case study (UDP vs. TCP) in order to answer questions about the deployability of current transport evolution approaches, and demonstrate the extent of copycat's capabilities and possible applications. While the vast majority of UDP impairments are found to be access-network linked, and subtle impairment is rare, middleboxes might adapt to new protocols that would then perform differently in the wild compared to early deployments or controlled environment testing. [less ▲]

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See detailTrajectory planning of soft link robots with improved intrinsic safety
Lismonde, Arthur ULg; Sonneville, Valentin; Bruls, Olivier ULg

in Proceedings of the 20th World Congress of the International Federation of Automatic Control (2017, July)

For human-robot cooperation, intrinsic safety approaches aim at reducing the energy involved in the motion of the robotic system and at increasing the system compliance in order to reduce the risk of ... [more ▼]

For human-robot cooperation, intrinsic safety approaches aim at reducing the energy involved in the motion of the robotic system and at increasing the system compliance in order to reduce the risk of injury in case of an unexpected collision. Robots based on lightweight and inherently exible links exhibit attractive features in this context but the control of their motion then leads to a tremendous challenge. This paper presents a novel trajectory planning method for 3D robots which aims at improving the tracking accuracy despite the link exibility. [less ▲]

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See detailA field quantification of all inclusive fish-pass efficiency using a combined telemetry system
Ovidio, Michaël ULg; Sonny, Damien; Dierckx, Arnaud ULg et al

Conference (2017, July)

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See detailClinical outcome after tracheal resection and anastomosis for correction of a tracheal stenosis in a sport pony
Salciccia, Alexandra ULg; Roose, Charlotte; Joostens, Zoé ULg et al

Poster (2017, July)

Introduction: Tracheal stenosis, which refers to a narrowing of the tracheal lumen, is infrequent in horses. The literature is scarce about outcome after treatment of this pathology. Objectives: To report ... [more ▼]

Introduction: Tracheal stenosis, which refers to a narrowing of the tracheal lumen, is infrequent in horses. The literature is scarce about outcome after treatment of this pathology. Objectives: To report our experience using tracheal resection and anastomosis to treat a severe trauma-induced tracheal stenosis (< 1 cm diameter of lumen) involving 2 tracheal rings causing a loud respiratory noise at rest in a 14 y.o. event pony. Methods: The pony was trained to wear a martingale preoperatively. Before the surgery, a distal tracheotomy was performed for placement of the tracheal tube for maintenance of gaseous anaesthesia. Through a 35 cm ventral midline cervical incision, the trachea was exposed and separated from adjacent tissues. Stay sutures were placed in tracheal cartilage adjacent to the segment to be removed. The 2 tracheal rings involved in the stricture were subsequently removed. On both remaining segments of the trachea, the mucosa was turned back over the open end and sutured to the adventitia. The head was then flexed and tracheal ends were apposed using 5 stainless steel wires placed equidistantly around the trachea without mucosal penetration. The anastomosis was completed by a simple continuous suture of resorbable material on the adventitia. A closed suction drain was applied in the soft tissue before routine closure of the subcutaneous and cutaneous layers. The martingale was applied before the recovery from anaesthesia, which was uneventful. The tracheotomy tube and the suction drain were left in place for 48h. The martingale was removed after 3 weeks. The pony was discharged 1 month after surgery. Control endoscopies were performed during hospitalisation and at 7, 10, 17, 21 and 30 weeks and 1 year after surgery. Results: A moderate cicatrix recurred. The excessive tissue was injected with triamcinolone and then with 4% formaldehyde during the first endoscopies and remained stable thereafter. Some stainless steel cerclages broke and displaced slightly. This caused the formation of a self-resolving seroma caudally to the trachea. A moderate respiratory noise was still audible at low-intensity work, which was resumed 4 months postoperatively. However, work was stopped before achieving the preoperative level because the pony developed a lameness. Conclusions: Although a moderate tracheal cicatrix recurred after surgery, tracheal resection and anastomosis clearly improved the quality of life of this pony. [less ▲]

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See detailStable isotopes reveal effects of environmental changes on ecological niches of Iphimediidae amphipods
Michel, Loïc ULg; d'Udekem d'Acoz, Cédric; Frederich, Bruno ULg et al

Poster (2017, July)

When faced with environmental changes, organisms are expected to have some intrinsic ability to adapt through ecological plasticity. However, this process is still poorly understood in many Antarctic ... [more ▼]

When faced with environmental changes, organisms are expected to have some intrinsic ability to adapt through ecological plasticity. However, this process is still poorly understood in many Antarctic invertebrates. Here, we focused on Iphimediidae amphipods, as this widely distributed family shows important ecological diversity. In total, 248 amphipods (19 species) from two widely different zones (the West Antarctic Peninsula, or WAP, and Adélie Land, AL) were studied to elucidate how environment can influence ecological niche parameters. Ecological niches were explored using stable isotope ratios of carbon and nitrogen and the SIBER approach (Jackson et al., 2011). The isotopic niche of the whole amphipod assemblage was wider in WAP than in AL. This was true for both total (proxy of the whole range of resources exploited by animals) and the core (proxy of the most commonly used resources) isotopic niches. The ratio between total and core isotopic niches was smaller in WAP than in AL (4.13 vs. 5.74), suggesting that in WAP, animals commonly use a greater relative percentage of the resources to which they have access. Niche modelling at the specific level revealed that this trend was not found in all taxa. For example, niches of Gnathiphimedia sexdentata and Iphimediella microdentata were bigger in WAP than in AL, following the general pattern. On the other hand, niches of Echiniphimedia echinata and E. hodgsoni had the same width in both areas. Moreover, relative niche overlap between these two species was much higher in WAP (42%) than in AL (20%). Our results indicate that the widely different environmental conditions encountered by the animals in these two zones clearly influence their ecology. Overall, Iphimediidae amphipods tend to exploit more resources in WAP, i.e. in the zone where impacts of global change (temperature increase, sea ice cover decrease) are the strongest. Niche overlap between some closely related (i.e. congeneric) species was also more important in WAP. Ultimately, environmental changes in this region might reinforce these trends, which might lead to competition and perturb amphipod community structure. This research was funded by the Belgian Federal Science Policy Office (BELSPO) in the framework of the vERSO and RECTO projects. [less ▲]

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See detailÉvolution de l'enneigement moyen dans les Alpes au cours du 20e siècle à l'aide du modèle atmosphérique régional MAR
Belleflamme, Alexandre ULg; Wyard, Coraline ULg; Doutreloup, Sébastien ULg et al

in Dahech, Salem; Charfi, Sami (Eds.) Actes du XXXème colloque de l'Association Internationale de Climatologie - Climat, ville et environnement (2017, July)

The evolution of the snow height over the Alps can strongly impact tourism, but also the water availability of the region. In this study, we have reproduced the evolution of the climate in the Alps over ... [more ▼]

The evolution of the snow height over the Alps can strongly impact tourism, but also the water availability of the region. In this study, we have reproduced the evolution of the climate in the Alps over the 20th century with the help of the regional atmospheric model MAR forced by three reanalyses (ERA-20C, NCEP/NCAR, and ERA-Interim). MAR shows that the snow height has increased since the beginning of the 20th century, first only at higher altitudes, then also at lower levels, before knowing a strong and abrupt decrease between 1985 and 1990. This evolution, which is consistent with observations given in the literature, is directly linked with the trends of NAO and AO. In fact, the atmospheric circulation changes highlighted by NAO and AO induce temperature and precipitation changes that directly determine the snow height in the Alps. [less ▲]

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See detailAggregation of flexible domestic heat pumps for the provision of reserve in power systems
Georges, Emeline ULg; Quoilin, Sylvain ULg; Mathieu, Sébastien ULg et al

in Proceedings of the 30th International Conference on Efficiency, Cost, Optimisation, Simulation and Environmental Impact of Energy Systems. (2017, July)

The integration of renewable energy sources in the electricity production mix has an important impact on the management of the electricity grid, due to their intermittency. In particular, there is a ... [more ▼]

The integration of renewable energy sources in the electricity production mix has an important impact on the management of the electricity grid, due to their intermittency. In particular, there is a rising need for flexibility, both on the supply and demand sides. This paper assesses the amount of flexibility that could be reserved from a set of flexible residential heat pumps in a given geographical area. It addresses the problem of a load aggregator controlling a set of heat pumps used to provide both space-heating and domestic hot water. The flexibility of the heat pumps is unlocked in order to reduce electricity procurement costs in the day-ahead electricity market, while ensuring the provision of a predefined amount of reserve for real-time grid management. The objective of the paper is two-fold. On the one hand, an aggregation method of large sets of heat pumps based on physics-based models and random sampling techniques is proposed. On the other hand, a combined optimization problem is formulated to determine both the optimal electricity demand profile to be bought on the day-ahead market and the cost associated to the reservation of a defined amount of power. The method is applied to a set of 40000 residential heat pumps in Belgian houses. Results show that these houses can provide up to 100MW of upward reserve for 50% of the current costs. The provision of downward reserve at competitive cost is hampered by significant overconsumption. [less ▲]

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See detailBeta Cell Regeneration in Zebrafish : Investigating the Ductal Contribution
Bergemann, David ULg; Massoz, Laura; Bourdouxhe, Jordane ULg et al

Poster (2017, July)

Diabetes is characterized by the loss of insulin producing beta cells. Although different therapeutic strategies do exist, they lack precise and dynamic control of glycemia as carried out by endogenous ... [more ▼]

Diabetes is characterized by the loss of insulin producing beta cells. Although different therapeutic strategies do exist, they lack precise and dynamic control of glycemia as carried out by endogenous beta cells. One promising alternative is to replenish the pancreas with bona fide functional beta cells by triggering regeneration mechanisms. Previous studies have shown beta cell neogenesis originating from different pancreatic cell types (alpha, delta, acinar and ductal cells), depending on the used model. The ductal origin is supported by the fact that the embryonic duct epithelium gives rise to the endocrine lineage, and that in healthy and diabetic human adults, insulin positive cells could be found next to or in pancreatic ducts. Despite these observations, mammals show very limited regenerative capabilities, making it difficult to investigate those mechanisms. In contrast, zebrafish are extensively used for regeneration studies. The ability of adult zebrafish to regenerate its beta cells and restore normoglycemia after massive beta cell ablation has already been shown. We, and other groups, have previously shown that adult pancreatic duct cells act as progenitors, giving rise to beta cells in physiological and induced diabetic condition in vivo. To get insight into this process, we conducted comparative RNA-seq experiments on pancreatic duct cells from adult zebrafish. By this means, we identified regulated gene expression that can be linked to specific processes/pathways such as cell cycling and Notch. In order to confirm the involvement of identified candidate genes/pathways, we are setting up a screening method using chemical activators and inhibitors in old larvae, by looking at their ability to modify proliferation/differentiation of duct cells after beta cell ablation. In addition, we are also investigating the effect of mutations, generated by the CRISPR/Cas9 system within candidate genes, on the regeneration capabilities. Together, these strategies should provide new clues about regenerative processes triggered in duct cells that might be applied to overcome the poor regenerative capabilities of mammals. [less ▲]

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See detailAgency and delinquency among adolescence during their transition to adulthood: what role in the desistance process?
Puglia, Rosa ULg; Glowacz, Fabienne ULg

Poster (2017, June 31)

Recent studies have shown that agency plays an important role in the desistance process. This variable allows the transition from delinquent identity to non-delinquent identity. However, despite ... [more ▼]

Recent studies have shown that agency plays an important role in the desistance process. This variable allows the transition from delinquent identity to non-delinquent identity. However, despite increasing literature about this topic, there is a lack of consensus regarding the role of this variable in the desistance process. Also, the way to measure this phenomenon remains unclear. In our study, agency is thought within a border framework, namely the understanding of all kind of behavior. According to the social cognitive theory, emotional and cognitive processes influence human behavior: emotions and thoughts that will define ways of acting and will motivate behavioral changes. Outcomes expectancies can be help or hinder for the concretization of behavioral change. We conducted a qualitative research among adolescents (aged 17-18) who are engaged in a delinquent trajectory. Our objective are to understand how these young in transition to adulthood leave delinquent lifestyle by evaluating to their life course and delinquent course. Each participant was interviewed with a semi-structured interview. To ensure that the interviews provided rich insights into participants’ reality, the interview was designed to elicit detailed information on relevant themes including identity, turning point, future and delinquency trajectory. Desistance was not explicitly questioned. All interviews were taperecorded and analyzed using IPA method (Smith, 2003). Mastery Scale (Pearlin, 1978), Causal Attribution Scale (Rossier, 2002), Hope Scale (Snyder, 1991) and University Rhode Island Change Assessment Scale (McConnaughy, 1983) were also administered. We see that the younths interviewed are at different stage in their desistance process. All of them, persistent or desistant, consider taking a hold on their lives. These results encourage thinking agency in the understanding of all kind of behavior. We should then take into account the beliefs and expectations of results as a variable mediating the relationship between agency and desistance. [less ▲]

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See detailPopular Music Studies in French Universities
Pirenne, Christophe ULg

Conference (2017, June 30)

Since the turn of the century, the study of popular music has become one of the hottest topics in French Universities. Of the 71 existing institutions, nearly all of them have one or another official ... [more ▼]

Since the turn of the century, the study of popular music has become one of the hottest topics in French Universities. Of the 71 existing institutions, nearly all of them have one or another official expert on that question. But between the study of a national or an international heritage, between scientific disciplines and humanities, researches devoted to popular music seems to be as perennial as fragmented. My paper will aim to present the evolution of recruitment in this area. Which disciplines were the most active in those recruitments and, beyond these raw numbers, what does it mean ? Why is the French academic situation so different to that of Italy for example ? What are the challenges of this academisation ? Which topics are taught under this heading ? I’d like to show that next to the objective reasons of this disciplinary interest, there are also various institutional issues that seems to correspond exactly to the assumptions of Bruno Latour (La science en action, 1989) and Edward Slowik (Structure of Musical Revolutions, 2007). [less ▲]

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See detailAntarctic cyanobacteria: from diversity to genomics
Wilmotte, Annick ULg

Conference (2017, June 30)

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See detailSmall solar system bodies as granular systems
Hestroffer, Daniel; Campo Bagatin, Adriano; Losert, Wolfgang et al

in EPJ Web of Conferences (2017, June 30)

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See detailThe role of Gender, Race, and Class in Transnational Political Movements: Mexican and Colombian Women Engaging in Homeland Politics from Europe’s Capital
Lara-Guerrero, Larisa; Vivas Romero, Maria ULg

Conference (2017, June 30)

Drug trafficking is a mounting security problem in Latin America, specifically for the primary producers of narcotics in the region: Mexico and Colombia. The security concern from both countries has ... [more ▼]

Drug trafficking is a mounting security problem in Latin America, specifically for the primary producers of narcotics in the region: Mexico and Colombia. The security concern from both countries has triggered the political and social mobilization of Mexican and Colombian migrants from abroad many of them from the Global City of Brussels. This paper unpacks the motivations and dynamics behind transnational political activism organized by Mexican and Colombian women living in Brussels. By integrating and revising insights from social movements theories, political transnationalism from migration studies and intersectionality studies, this paper elaborates on the role of migrant women organizing and sustaining transnational political movements to change the political conditions of their countries of origin. The ethnographic evidence presented in this paper reveals the importance to recognize the individual level in the analysis of transnational movements. Women are cognitive actors with political ideals and emotions whose political activism is highly influenced by social categorizations such as gender, race, class, and generation. [less ▲]

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See detailVibration Induced Phenomena in Granular Media in Microgravity
Opsomer, Eric ULg; Noirhomme, Martial ULg; Vandewalle, Nicolas ULg

in EPJ Web of Conferences (2017, June 30)

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See detailLa narrativité greimassienne comme élément d'organisation du sens dans le croisement du football et la publicité
Bassilua Nzuzi, Anicet ULg

Conference (2017, June 30)

Considérée comme principe d’organisation du discours (Greimas et Courtés, 1979), la narrativité greimassienne semble garder ce statut au-delà des types d’objets sur lesquels elle a été testée à l’origine ... [more ▼]

Considérée comme principe d’organisation du discours (Greimas et Courtés, 1979), la narrativité greimassienne semble garder ce statut au-delà des types d’objets sur lesquels elle a été testée à l’origine, par exemple le système d’oppositions dans les figures-signes. Notre étude, consacrée aux pratiques du football et de la publicité telles qu’elles se réalisent et se croisent au stade, montre que la narrativité, en lien avec le système tensif des possibles, organise aussi le parcours du sens dans cette interaction. Cette opération se déroule à deux niveaux de pertinence hiérarchisés: niveau de l’organisation syntagmatique de chacun des deux ensembles (niveau inférieur) et niveau de leurs ajustements l’un vers l’autre (niveau supérieur). On repère ainsi, pour le football, par exemple une organisation syntagmatique qui se réalise par la succession des séquences (passe, tacle, but, etc.) qu’opèrent des sujets (joueurs) à partir d’un système ordonné des modes d’existence des unités (potentialisation /virtualisation - actualisation/réalisation). Pour la publicité, cela se réalise à travers l’agencement des syntagmes (topologiques, eidétiques, chromatiques) qui s’inscrivent sur les objets-supports (panneaux) selon le même schéma. Les deux univers s’ajustent par la suite grâce à la combinaison de deux types d’articulations (statiques et dynamiques) qui, au final, aboutit à la formation d’une sorte de discours englobant “football-publicité” qui présente une organisation syntaxique propre. [less ▲]

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See detailDe la caricature à la bande dessinée, et retour : enjeux poétiques et médiatiques d’une affinité (1830-1890)
Stienon, Valérie ULg

Conference (2017, June 29)

Dans quelle mesure la caricature, avec sa créativité graphique et les sociabilités artistiques et journalistiques sur lesquelles elle repose, a-t-elle constitué un paramètre décisif dans l’émergence de ... [more ▼]

Dans quelle mesure la caricature, avec sa créativité graphique et les sociabilités artistiques et journalistiques sur lesquelles elle repose, a-t-elle constitué un paramètre décisif dans l’émergence de l’art séquentiel au XIXe siècle ? La bande dessinée et la caricature ne sont pas seulement deux langages qui s’accommodent l’un à l’autre sur des supports partagés, en journal et en album, mais aussi des formes d’expression résultant de conditions techniques de production du texte-image, de réseaux éditoriaux croisés et d’une inscription dans l’actualité socioculturelle. On sait l’importance de l’équipe Aubert, pionnière de la caricature de presse, dans la reprise de l’œuvre de Töpffer via la collection des Jabots. Il reste à comprendre pourquoi certains caricaturistes ont initié l’art séquentiel sans l’affirmer comme tel (cas de J.J. Grandville) et comment la bande dessinée s’est approprié spécifiquement la pratique de la charge à mesure qu’elle trouvait son propre développement (voir notamment l’œuvre de Christophe). Centrée sur la production de la période 1830-1890, la communication propose d’examiner la culture matérielle qui détermine les diverses réorganisations du dispositif unissant la vignette à la légende, et d’étudier sous cet angle le triple rapport à l’actualité, à la sérialité et à l’humour qui anime conjointement la caricature et la bande dessinée. [less ▲]

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See detailA Discussion on the Advancement of Blade Tip Timing Data Processing
Kharyton, Vsevolod; Dimitriadis, Grigorios ULg; Defise, Colin

in Proceedings of the Turbomachinery Technical Conference & Exposition, TURBO EXPO 2017 (2017, June 29)

The Blade Tip Timing method (BTT) is a well-known approach permitting individual blade vibration behavior characterization. The technique is becoming increasingly popular among turbomachinery vibration ... [more ▼]

The Blade Tip Timing method (BTT) is a well-known approach permitting individual blade vibration behavior characterization. The technique is becoming increasingly popular among turbomachinery vibration specialists. Its advantages include its non-intrusive nature and its capability of being used for long-term monitoring, both in on-line and off-line analysis. However, the main drawback of BTT is frequency aliasing. Frequency aliasing effects in tip timing can be reduced by means of the application of different methods from digital signal analysis that can exploit the non-uniform nature of the data sampled by BTT. This non-uniformity is due to the fact that an optimization of the circumferential distribution of BTT probes is usually required in order to improve the data quality for targeted modes of blade vibration and/or orders of excitation. The BTT data analysis methods considered in this study are the non-uniform Fourier transform, the minimum variance spectrum estimator approach, a multi-channel technique using in-between samples interpolation, the Lombe-Scargle periodogram and an iterative variable threshold procedure. These methods will be applied to measured data representing quite a large scope of events occurring during gas-turbine compressor operation, e.g. synchronous engine order resonance crossing, rotating stall, suspected limit-cycle oscillations. Finally, the frequency estimates obtained from all these methods will be summarized. [less ▲]

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See detailExperimental characterisation of tape spring nonlinear compliant mechanisms
Dewalque, Florence ULg; Schwartz, Cédric ULg; Denoël, Vincent ULg et al

Conference (2017, June 29)

Tape springs are compliant mechanisms used as alternative to kinematic joints, for example, in deployable space structures. To reach a detailed understanding of their highly nonlinear behaviour, involving ... [more ▼]

Tape springs are compliant mechanisms used as alternative to kinematic joints, for example, in deployable space structures. To reach a detailed understanding of their highly nonlinear behaviour, involving buckling, the formation of folds, nonlinear vibrations and hysteresis, an experimental set-up is designed. Dynamic and quasi-static tests are performed, as well as small amplitude vibration tests and large amplitude deployments in order to collect data in a broad variety of cases. The acquisition equipment consists of a 3D motion analysis system which triangulates the position of active markers and a force plate. The reproducibility of the acquisitions is assessed and the parameters affecting the measurements are identified. In the end, a finite element model is developed and correlated with the experimental results. [less ▲]

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See detailL’usage vocal des professeurs de formation musicale
Remacle, Angélique ULg; Schiller, Isabel ULg; Sfez, Lou et al

Conference (2017, June 29)

Introduction : En Belgique, les professeurs de formation musicale, ou professeurs de solfège, dispensent une éducation à la musique par un enseignement du langage musical. Plus précisément, ils enseignent ... [more ▼]

Introduction : En Belgique, les professeurs de formation musicale, ou professeurs de solfège, dispensent une éducation à la musique par un enseignement du langage musical. Plus précisément, ils enseignent l’apprentissage de la rythmique, de la lecture et de l’écriture de partitions, la pratique du chant, le développement de l’oreille musicale, ou encore la constitution d’un répertoire de référence. Ces enseignements sont dispensés dans des académies de musique ou des conservatoires. En tant que professionnels de la voix, ces professeurs font partie des travailleurs les plus à risque de consulter un phoniatre pour leur voix (1). Cependant, leur usage vocal reste peu décrit. Cette étude a pour objectif 1) de mesurer la charge vocale de professeurs de formation musicale en contexte professionnel et extra-professionnel, 2) de décrire l’influence du bruit ambiant sur leur voix et 3) d’identifier l’impact de la charge vocale sur leur qualité et leur fatigue vocale. Méthode : 13 professeurs de formation musicale (9 femmes, 4 hommes) ont été enregistrés pendant une semaine complète à l’aide d’un dosimètre vocal (VoxLog) porté du lever au coucher. Le dosimètre mesure la durée de phonation et la fréquence vocale (F0) avec un accéléromètre, ainsi que l’intensité de la voix et du bruit ambiant avec un microphone positionné au niveau du cou. L’analyse du signal est réalisée avec le logiciel VoxLog Discovery. Ce logiciel calcule notamment le nombre d’oscillations des plis vocaux par jour. A la fin de chaque journée, les professeurs ont auto-évalué leur qualité et leur fatigue vocale à l’aide d’échelles visuelles analogiques. Résultats : Les paramètres vocaux et le bruit ambiant sont significativement plus élevés en contexte professionnel qu’extra-professionnel (p<.001). L’élévation du bruit ambiant est accompagnée d’une élévation de l’intensité vocale pour les 13 professeurs (r=.61, p<.001), ainsi que d’une augmentation de F0 pour les femmes (r=.41, p=.002) mais non pour les hommes (r=.39, p=.055). Enfin, le bruit ambiant élevé est associé à une augmentation de la durée de phonation (r=.05, p<.001). L’augmentation du nombre d’oscillations journalier des plis vocaux est associée à une augmentation de la fatigue (r=0.438, p<.001) et à une diminution de la qualité vocale (r=-0.538, p<.001). Conclusion : De façon similaire aux professeurs d’école (2), les paramètres vocaux ainsi que le bruit ambiant sont significativement plus élevés en contexte professionnel. Sur leur lieu de travail, les professeurs d’éducation musicale sont confrontés à un bruit ambiant dépassant la limite recommandée par l’OMS (3). En accord avec l’effet Lombard, ce bruit élevé est associé à une augmentation de l’intensité vocale. Chez les femmes, une voix plus aigüe est observée en environnement bruyant. Comme dans l’étude de Ternström, Södersten et Bohman (4), un bruit ambiant élevé est associé à une durée de phonation plus importante, potentiellement dû à une prolongation des segments voisés par souci d’intelligibilité. En conclusion, les professeurs de formation musicale utilisent leur voix de manière intensive dans le cadre de leur travail, alternant voix parlée et voix chantée. Les corrélations entre le nombre d’oscillations journalier et les auto-évaluations montrent que la quantité de voix utilisée a un impact sur le ressenti des participants. De plus, l’élévation du bruit est corrélée à une augmentation des paramètres de charge vocale. Bibliographie 1. Remacle, A., Petitfils, C., Lejeune, L., Finck, C., & Morsomme, D. (2015, April 10). What is the professional profile of patients in phoniatrics? Oral communication presented at the 4th International Occupational Voice Symposium, London, UK. 2. Remacle, A., Morsomme, D., & Finck, C. (2014). Comparison of vocal loading parameters in kindergarten and elementary school teachers. Journal of Speech, Language, and Hearing Research, 57, 406-415. 3. Inserm. (2006). La voix : Ses troubles chez les enseignants (Expertise collective). Paris : Institut National de la Santé et de la Recherche médicale. 4. Ternström, S., Södersten, M., & Bohman, M. (2002). Correlation of simulated environmental noise as a tool for measuring vocal performance during noise exposure. Journal of Voice, 16(2), 195-206. [less ▲]

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See detailThe art to talk on immigration: a state of emergency
Da Silva, Amanda Carolina ULg

Conference (2017, June 29)

This paper intend to present the results of the state of emergency project. The project started in 2014 with a simple question: how researchers that work in immigration can communicate with civil society ... [more ▼]

This paper intend to present the results of the state of emergency project. The project started in 2014 with a simple question: how researchers that work in immigration can communicate with civil society outside the traditional academic channels? It is not only a matter of popularization of academic research, but mainly brings researchers into society, far from the academic walls. The answer to this question was the art and the spaces of culture. Art, and also cultural spaces have enormous potential, its could bring together different social groups and help researchers to be in society, and making their research accessible. In the society, debates on immigration are mostly dominated by media and political representations, what is also polarizing societies between solidarity and anti-immigration movement's. Therefore, the presence of researchers to discuss the immigration issue in society has become urgent. The state of emergency project had as a bases my research, “The borders of Nord-Pas-deCalais” (2014), and brought together two dancers, two acrobats, a scene director and a plastic artist. The project started from the assumption that art is a collective production, but artistic intention started with the individual consciousness on the issue the artist is focusing. It was adopted the artistic improvisation method to develop a spectacle and other tolls. In order to incorporate research on immigration into artistic production it was necessary to present and to appropriate the artists of basic concepts, but also carry out a fieldwork, that was developed during a month at the French border (Calais city). The methodology adopted by the artists consisted in a fieldwork. The project took two years to be concluded. The result was a dance spectacle, “Dites a ma mère que je suis la”, and a hybrid form of workshop that mixes the artistic and the methods of immigration research. I contrast, I developed during the project a multi-sited ethnography whit the artists. Where the main objective was to understand which impact the scientific knowledge on the issue could produce in artist's way to see immigration, and how this new approach could change the researcher and artist productions. [less ▲]

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See detailAssessment of AquaCrop for maize and winter wheat using satellite derived fCover data
Mohamed Sallah, Abdoul-Hamid ULg; Wellens, Joost ULg

in 19th International Workshop on the Analysis of Multitemporal Remote Sensing Images (2017, June 29)

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See detailMean and variance of Dynamic Functional Connectivity in Parkinson’s Disease
Baquero Duarte, Katherine Andrea ULg; Guldenmund, Pieter; Rouillard, Maud ULg et al

Poster (2017, June 29)

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See detailSpatial OnLine Analytical Processing Applied to Cities Security with Raster Data - A Case Study on Emergency Services of Brussels Agglomeration
Kasprzyk, Jean-Paul ULg; Devillet, Guénaël ULg

Conference (2017, June 29)

Public institutions in charge of cities security are confronted to always more complex and voluminous data. In particular, georeferenced data can be extracted from many sources: mobile phones, social ... [more ▼]

Public institutions in charge of cities security are confronted to always more complex and voluminous data. In particular, georeferenced data can be extracted from many sources: mobile phones, social media, cars, security camera, satellite images, crowdsourcing, geography portals, etc. Uses of these data are various. For instance, it is very precious to firefighters in order to fairly distribute their resources (equipment and men) on the territory. These large spatial data sets (“Big Data”) require powerful tools for their extraction and their analysis. For this purpose, an original Spatial OnLine Analytical Processing (SOLAP) model is developed for emergency services. A case study involving firefighters and medical aids of Brussels is presented [less ▲]

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See detailCo-producing sociotechnical solutions in difficult times: the art of governing nuclear wastes in France
Parotte, Céline ULg; Delvenne, Pierre ULg

Conference (2017, June 29)

Radioactive wastes and their management are posing pressing political and epistemic issues to modern societies such as, for instance, how shall we design sociotechnical solutions to deal with an object ... [more ▼]

Radioactive wastes and their management are posing pressing political and epistemic issues to modern societies such as, for instance, how shall we design sociotechnical solutions to deal with an object with a half-life of more than 100.000 years? This paper’s starting point is the so-called “participatory turn” in the nuclear waste management (NWM) in France, when tensions appeared concerning claims of epistemic authority of national nuclear agencies. In 1990, in the aftermath of violent contestations and citizen mobilization in four Departments, the then Prime Minister of France, Michel Rocard, decided to impose a one-year moratorium on the research conducted by the national nuclear waste management organization (ANDRA). A not so well-known parliamentary technology assessment (PTA) institution, OPECST (the French Office Parlementaire d’Evaluation des Choix Scientifiques et Technologiques), was called to the rescue to clear up a difficult situation and to restore trust between state and scientific agencies and a critical population. We find that OPECST played a surprisingly central role in defining the French NWM program. [less ▲]

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See detail"Exploring Experiences of Inequality in European Urban Centers: Towards an Intersectional and Transnational Approach."
Vivas Romero, Maria ULg; Ramos, Cristina

Conference (2017, June 28)

What strategies do migrants living in European cities use to challenge inequalities in access to healthcare, participation in the labor market and the creation of social support networks? The papers in ... [more ▼]

What strategies do migrants living in European cities use to challenge inequalities in access to healthcare, participation in the labor market and the creation of social support networks? The papers in this panel aim to respond to this question by drawing from transnational and intersectional approaches conceptualizing inequalities as sets of relationships between people and broader structures in which interactions generate better opportunity for some more than for others (Tilly, 2000). Panel participants consider that these interactions and the benefits that can be obtained through migration are affected by various social categories such as gender, class, sexual identity, transnational connections, and citizenship. Intersectional approaches allow to examine how these axes of inequality (Crenshaw, 1989; Anthias, 2001) simultaneously affect migration outcomes and also how they operate differently according to the geographical space in which they develop: origin and host societies as well as transnationally. Nonetheless, the papers presented in this panel will also emphasize migrants’ agency to resist or conform to the inequalities they face. Overall, this panel aims to contribute to the study of migration and inequality at the conceptual and methodological levels. At the theoretical level, the panel will build on new debates on the reproduction of intersectional inequalities in transnational settings (Faist, 2016, Amelina, 2017). At the methodological level, all paper presenters have use multi-sited ethnographic methods (working in cities such as Madrid, London, Milan, Brussels and Frankfurt) and will therefore use the panel as an opportunity to discuss the strengths and weaknesses of such method. [less ▲]

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See detailOn the transition between symmetric and asymmetric flow in rectangular shallow reservoirs - a case of maximum energy dissipation?
Westhoff, Martijn; Erpicum, Sébastien ULg; Archambeau, Pierre ULg et al

Conference (2017, June 28)

Shallow reservoirs are often used as sediment traps or storage basins, in which sedimentation depends on the flow pattern. Short rectangular reservoirs reveal a straight jet from inlet to outlet with ... [more ▼]

Shallow reservoirs are often used as sediment traps or storage basins, in which sedimentation depends on the flow pattern. Short rectangular reservoirs reveal a straight jet from inlet to outlet with identical recirculation zones on both sides. In longer reservoirs, the main jet reattaches to the side of the reservoir leading to small and large recirculation zones. Previous studies have found an empirical geometric relation describing the switch between these two flow patterns. In this study, we demonstrate, with a simple analytical model, that this switch coincides with a maximization of energy dissipation in the shear layer between the main jet and recirculation zones: Short reservoirs dissipate more energy when the flow pattern is symmetric, while longer reservoirs dissipate more energy with an asymmetric pattern. This approach enables the prediction of the flow patterns without detailed knowledge of small scale processes, potentially useful in the early phase of reservoir design. [less ▲]

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See detailAbsent, yet present? Tracing "Responsible Research and Innovation" in Radiation Protection Research
Van Oudheusden, Michiel ULg

Conference (2017, June 28)

In this paper, I argue that although the notion of responsible research and innovation (RRI) is manifestly absent in research programs for radiation protection and nuclear research and training, RRI is ... [more ▼]

In this paper, I argue that although the notion of responsible research and innovation (RRI) is manifestly absent in research programs for radiation protection and nuclear research and training, RRI is increasingly recognized, and mobilized, by various actors in the field; is an essentially contested concept; and facilitates the development of a sizeable network comprising actors with a variety of roles, expectations and stakes, including researchers in the social sciences and humanities (SSH). To sustain these points, I draw on my experiences as an embedded social scientist in nuclear research, singling out sites and instances (e.g. the crafting and dissemination of the 2015 Ricomet Public Declaration, SSH research within the EU-Concert framework, conversations with radiation protection researchers) where RRI is explicitly discussed, propagated, negated, or transformed. This exploration highlights recurring challenges of “translating” RRI to radiation protection research, such as the strong evaluative connotation of RRI and its top-down character; the lack of industry involvement in RRI processes; the tight connection between RRI and new and emerging technologies; and the hybridization of SSH through inter- and transdisciplinary research. I discuss each of these challenges in turn, with the aims of reflexively considering how RRI is co-produced in radiation protection research through negotiations between stakeholders and the interplay of practices and artifacts; and what the potential implications of these processes are for SSH engagement in the field. [less ▲]

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See detailWear behaviour of laser clad High Speed Steels thick deposits
Hashemi, Seyedeh Neda ULg; Tchuindjang, Jérôme Tchoufack ULg; Dedry, Olivier ULg et al

Conference (2017, June 28)

The wear behaviour of 4 different High Speed Steel (HSS) thick coatings (one cast material and 3 laser clad deposits with varying Mo, V and W contents) was investigated at 2 different test temperatures, i ... [more ▼]

The wear behaviour of 4 different High Speed Steel (HSS) thick coatings (one cast material and 3 laser clad deposits with varying Mo, V and W contents) was investigated at 2 different test temperatures, i.e. at room temperature and at 300°C. For all four materials under both test conditions, oxidative wear was identified as the main wear mechanism. The 3 laser clad deposits exhibit a higher wear resistance compared to the conventional cast reference material, and this effect was mainly attributed to their strongly refined microstructures. Moreover, a detailed comparison of the wear behaviour of the 3 laser clad deposits, in correlation with their microstructures, allows a better understanding of the effect of the different carbides and of their morphology. [less ▲]

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See detailAntimicrobial activities of key intermediate plant oxylipins
Deboever, Estelle ULg

Conference (2017, June 28)

Nowadays, biopesticides have emerged as a main alternative to conventional agriculture. In this context, plant oxylipins, a vast and diverse family of secondary metabolites originated from polyunsaturated ... [more ▼]

Nowadays, biopesticides have emerged as a main alternative to conventional agriculture. In this context, plant oxylipins, a vast and diverse family of secondary metabolites originated from polyunsaturated fatty acids (PUFAs), appear to be crucial agents in plant defense mechanisms. Among plant oxylipins, the 13-hydroperoxy oxylipins (13-HPO) constitute key intermediate oxylipins (KIOs) as they can be converted into jasmonic acid, OPDA, dn-OPDA or traumatic acid, well-characterized components involved in plant resistance mechanisms. Their presumed functions include direct antimicrobial effect, stimulation of plant defense gene expression, and/or regulation of plant cell death. However, the precise contribution of each KIOs to plant defense remains essentially unknown. In this work, we focus on two h13-HPO, the 13(S)-hydroperoxy-octadecadienoic acid (13-HPOD) and the 13(S)-hydroperoxy-octadecatrienoic acid (13-HPOT). In vitro growth inhibition assays were performed to investigate the direct antimicrobial activities against 7 pathogens of agronomic interest including bacteria, oomycetes and fungi. This study showed unambiguously that 13-HPO are able to hinder growth of some plant microbial pathogens, generally with a higher efficacity for 13-HPOT. In order to get a better insight into their mechanism of action, a complementary in silico and experimental biophysical approach was applied. Biomimetic pathogen plasma membranes are used to study the mechanism at the molecular level. Slight conformational differences may have significant impacts on their ability to interact with pathogens lipids and plasma membranes. [less ▲]

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See detailHolomorphic cohomological convolution
Dubussy, Christophe ULg

Poster (2017, June 28)

In his thesis, T. Pohlen succeeded in defining a Hadamard product between holomorphic functions defined on star-eligible subsets of the Riemann sphere. We show how this theory is actually a particular ... [more ▼]

In his thesis, T. Pohlen succeeded in defining a Hadamard product between holomorphic functions defined on star-eligible subsets of the Riemann sphere. We show how this theory is actually a particular case of the holomorphic cohomological convolution, defined in a general way thanks to the integration map on complex Lie groups. [less ▲]

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See detailThermal history modelling to understand microstructures observed in repair technology of Ti-6Al-4V
Tomé Jardin, Ruben Antonio ULg; Tchuindjang, Jérôme Tchoufack ULg; Paydas, Hakan ULg et al

Conference (2017, June 28)

Study of laser cladding as a possible technology to repair Ti-6Al-4V. Development of a FEM thermal to predict microstructure.

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See detailFrom local initiatives to territorial transition project: case study of a grassroots food belt project in Liège (Belgium)
Feyereisen, Marlène ULg; Stassart, Pierre M ULg; Jonet, Christian

Conference (2017, June 28)

This study analyses a local food initiatives in Liege (Belgium) linked to the Transition Network movement: Ceinture Aliment-Terre Liégeoise (CATL). The study aims to analyse how CATL evolved from a ... [more ▼]

This study analyses a local food initiatives in Liege (Belgium) linked to the Transition Network movement: Ceinture Aliment-Terre Liégeoise (CATL). The study aims to analyse how CATL evolved from a marginal grassroots movement, to a project of transition of the agri-food system which is considered exemplary by Belgian institutional actors. [less ▲]

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See detailInfluence of Si precipitates on fracture mechanisms of AlSi10Mg parts processed by Selective Laser Melting
Delahaye, Jocelyn ULg; Rigo, Olivier; Lecomte-Beckers, Jacqueline ULg et al

Conference (2017, June 28)

Al alloy AlSi10Mg processed by Selective Laser Melting displays a very fine cellular eutetic microstructure (melt pool fine, MP fine) due to fast cooling rate from the melt. Such microstructural ... [more ▼]

Al alloy AlSi10Mg processed by Selective Laser Melting displays a very fine cellular eutetic microstructure (melt pool fine, MP fine) due to fast cooling rate from the melt. Such microstructural refinement results in high tensile strength and hardness. Studies have shown that a coarser cells region (melt pool coarse, MP coarse) as well as a heat affected zone (HAZ) can be observed at the melt pool boundary caused by a change of thermal history [1]. Those microstructural inhomogeneities act like a weak zone as demonstrated by the laser tracks observed on fracture features after tensile test [2]. This study aims at investigating in which zone fracture occurs. To do so, MP fine, MP coarse and HAZ were analyzed. Si precipitates spacing was compared with dimples size observed on fracture features. The Si precipitates fraction were quantified by image analysis. Hardness tests were performed in the 3 different zones by nanoindentation. [1] Thijs et al., Acta Mater. 61 (2013) pp. 1809-1819 [2] Tang et al., JOM 69 (2017) pp. 516-522 [less ▲]

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See detailAtmospheric free acidity from cloud processing
Franco, Bruno ULg; Taraborrelli, Domenico; Gromov, Sergey et al

Conference (2017, June 27)

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See detailMUNIX vs TASPM
BENMOUNA, Karim ULg; MILANTS, Christophe ULg; WANG, François-Charles ULg

Poster (2017, June 27)

Detailed reference viewed: 34 (1 ULg)
See detailChine-Costa Rica. La projection des normes chinoises en Amérique centrale
Wintgens, Sophie ULg

Conference (2017, June 27)

Cet article a pour hypothèse que l’accroissement des échanges économiques et commerciaux de la Chine avec le Costa Rica, premier pays membre du Système d’intégration centraméricain (SICA) à avoir signé un ... [more ▼]

Cet article a pour hypothèse que l’accroissement des échanges économiques et commerciaux de la Chine avec le Costa Rica, premier pays membre du Système d’intégration centraméricain (SICA) à avoir signé un accord de libre-échange avec Pékin, va de pair avec la projection des normes économiques et politiques chinoises en Amérique centrale. Afin de démontrer cette hypothèse, il article analyse les enjeux de la présence de la Chine au Costa Rica afin de voir si sa politique commerciale envers l’Amérique centrale est porteuse d’un projet économico-politique régional. [less ▲]

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See detailIs going to space still worthwhile?
Rochus, Pierre ULg

Conference (2017, June 27)

Very often, we hear: “Is it still worth going to space? Aren’t there better causes to spend our money on, here on Earth?” At this talk, Pierre Rochus will highlight the importance of the benefits that ... [more ▼]

Very often, we hear: “Is it still worth going to space? Aren’t there better causes to spend our money on, here on Earth?” At this talk, Pierre Rochus will highlight the importance of the benefits that space activities and space research bring. He will try to convince the credulous that besides those everyday space applications that we obviously can no longer do without (GPS, for instance!), space science activities are also essential for humanity. Space research not only gives answers to fundamental questions facing humanity but the technical design of future missions also poses a challenge to the collective imagination. Space scientific research is not only an intellectual challenge, it is much more: it is a stimulus for technical developments; it requires constant, leading-edge developments in different technical domains such as:  systems miniaturisation,  light detectors,  new materials,  coatings,  cryogenics,  mechanisms,  electrical motors,  tribology (the study of friction, wear, lubrication, and the design of bearings)  ... Space Research gives rise to spin-offs and unpredictable developments which will come in useful in our future daily life. One hope is that some part of the huge budgets dedicated to military research could be transferred to space activities. And, of course, it is very important to convince young people to study sciences and technology - where better to start, than in space? [less ▲]

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See detailResearch on Fast Aeroelastic Modeling Methods for the Transonic Regime
Güner, Hüseyin ULg; Dimitriadis, Grigorios ULg; Terrapon, Vincent ULg

in Proceedings of the International Forum on Aeroelasticity and Structural Dynamics, IFASD 2017 (2017, June 27)

Two methods for modeling unsteady transonic flows at low computational cost are presented as a first step towards a fast and accurate aeroelastic calculation methodology for the preliminary design stage ... [more ▼]

Two methods for modeling unsteady transonic flows at low computational cost are presented as a first step towards a fast and accurate aeroelastic calculation methodology for the preliminary design stage in the transonic flow regime. The first approach corresponds to a quasi-steady approximation based on few steady simulations that is improved through the use of an unsteady filter. The second approach is based on the interpolation of dynamic modes between solutions at different frequencies that are obtained either from Dynamic Mode Decomposition (DMD) of unsteady simulations or directly from Harmonic Balance (HB) simulations. The two methods are illustrated in the case of a pitching airfoil in the transonic regime. Results show that the first method is fast and provides a first approximation of the unsteady dynamics. The computational cost of the second approach is higher, but the method provides better results in predicting aerodynamic forces and shock motion for a large range of reduced frequencies. [less ▲]

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See detailFreeplay-induced limit cycle oscillation mitigation using linear and nonlinear tuned vibration absorbers
Verstraelen, Edouard ULg; Kerschen, Gaëtan ULg; Dimitriadis, Grigorios ULg

in Proceeding of the IFASD 2017 Conference (2017, June 27)

Structural nonlinearities such as freeplay in control surface bearings and actuators or in connections between wings and external payloads sometimes lead to aeroelastic limit cycle oscillations at ... [more ▼]

Structural nonlinearities such as freeplay in control surface bearings and actuators or in connections between wings and external payloads sometimes lead to aeroelastic limit cycle oscillations at airspeeds lower than the linear flutter speed of the aircraft. In parallel, numerous studies demonstrated the potential of linear and nonlinear tuned vibration absorbers to increase the flutter speed of linear and continuously hardening aeroelastic systems such as two-degree- of-freedom wings or long span bridges. In this work, the effect of linear and nonlinear tuned vibration absorbers is studied on a wing with pitch plunge and control surface deflection degrees of freedom and with freeplay in pitch. Depending on the tuning of the linear absorber, the linear flutter speed of the system can be increased by 10% or the onset of limit cycle oscillations due to the freeplay can be delayed by 7.7% and their amplitude can be significantly decreased. The addition of cubic hardening forces on the absorber can further decrease the limit cycle amplitude in a limited airspeed range at the cost of an increase in limit cycle amplitude in another airspeed range. Conversely, the addition of a freeplay hardening force on the absorber can decrease the limit cycle amplitude without any detrimental effect. [less ▲]

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See detailLimit cycle oscillations of cantilever rectangular flat plates in a wind tunnel
Giannelis, Nicholas; Vio, Gareth A.; Dimitriadis, Grigorios ULg

in Proceedings of the International Forum on Aeroelasticity and Structural Dynamics, IFASD 2017 (2017, June 27)

A closed form state-space model of the nonlinear aeroelastic response of thin cantilevered flat plates is derived using a combination of Von Karman thin plate theory and a linearized continuous time ... [more ▼]

A closed form state-space model of the nonlinear aeroelastic response of thin cantilevered flat plates is derived using a combination of Von Karman thin plate theory and a linearized continuous time vortex lattice aerodynamic model. The modal-based model is solved for the amplitude and period of the limit cycles of the flat plates using numerical continuation. The resulting predictions are compared to experimental data obtained from identical flat plates in the wind tunnel. It is shown that the aeroelastic model predicts the linear flutter conditions and nonlinear response of the plates with reasonable accuracy, although the predicted limit cycle amplitude variation with airspeed is different to the one measured experimentally due to unmodelled physics. [less ▲]

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See detailDynamic stall onset variation with reduced frequency for three stall mechanisms
Boutet, Johan ULg; Dimitriadis, Grigorios ULg; Amandolese, Xavier

in Proceedings of the International Forum on Aeroelasticity and Structural Dynamics, IFASD 2017 (2017, June 27)

A set of unsteady aerodynamic load measurement is performed on three oscillating airfoils with distinct stall mechanisms: a flat plate, a NACA0012, and a NACA0018. The airfoils are forced to oscillate in ... [more ▼]

A set of unsteady aerodynamic load measurement is performed on three oscillating airfoils with distinct stall mechanisms: a flat plate, a NACA0012, and a NACA0018. The airfoils are forced to oscillate in pitch around the stall angle of attack with prescribed frequency and amplitude. A criterion proposed by Sheng et al. is used to locate the onset of the flow separation process associated with dynamic stall, and quantify its variation with an equivalent reduced pitch rate. The validity of this criterion is tested for the three airfoils at low Reynolds number, Re = 2 × 10^4. Results are compared with the experimental data obtained by Sheng et al. at higher Reynolds number of Re = 1.5 × 10^6. [less ▲]

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See detailNF-kB-dependent regulation of TET1 in breast cancers
Canale, Annalisa ULg; Collignon, Evelyne; Al Wardi, Clémence et al

Poster (2017, June 26)

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See detailSystem Eigenvalue Identification Of Mistuned Bladed Disks Using Least-Squares Complex Frequency-Domain Method
Huang, Yuan; Kielb, Robert E.; Li, Jing et al

in Proceeding of the Turbomachinery Technical Conference & Exposition TURBO EXPO 2017 (2017, June 26)

This paper presents the results from a research effort on eigenvalue identification of mistuned bladed rotor systems using the Least-Squares Complex Frequency-Domain (LSCF) modal parameter estimator. The ... [more ▼]

This paper presents the results from a research effort on eigenvalue identification of mistuned bladed rotor systems using the Least-Squares Complex Frequency-Domain (LSCF) modal parameter estimator. The LSCF models the frequency response function (FRF) obtained from a vibration test using a matrix-fraction description and obtains the coefficients of the common denominator polynomial by minimizing the least squares error of the fit between the FRF and the model. System frequency and damping information is obtained from the roots of the denominator; a stabilization diagram is used to separate physical from mathematical poles. The LSCF estimator is known for its good performance when separating closely spaced modes, but few quantitative analyses have focused on the sensitivity of the identification with respect to mode concentration. In this study, the LSCF estimator is applied on both computational and experimental forced responses of an embedded compressor rotor in a three-stage axial research compressor. the LSCF estimator is first applied to computational FRF data obtained from a mistuned first-torsion (1T) forced response prediction using FMM (Fundamental Mistuning Model) and is shown to be able to identify the eigenvalues with high accuracy. Then the first chordwise bending (1CWB) computational FRF data is considered with varied mode concentration by varying the mistuning standard deviation. These cases are analyzed using LSCF and a sensitivity algorithm is developed to evaluate the influence of the mode spacing on eigenvalue identification. Finally, the experimental FRF data from this rotor blisk is analyzed using the LSCF estimator. For the dominant modes, the identified frequency and damping values compare well with the computational values. [less ▲]

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See detailLes rouleaux littéraires coptes de papyrus (fin du IIIe - VIIe siècle)
Carlig, Nathan ULg

Conference (2017, June 23)

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See detailQuatre années d'un chantier au XVIe siècle : la façade méridionale de la collégiale Saint-Martin de Liège
Joly, Emmanuel ULg

Conference (2017, June 23)

Bien que peu étudiée jusqu'ici, la reconstruction de la collégiale Saint-Martin est une des entreprises monumentales majeures du XVIe siècle à Liège. Le bâti et les archives conservées permettent d ... [more ▼]

Bien que peu étudiée jusqu'ici, la reconstruction de la collégiale Saint-Martin est une des entreprises monumentales majeures du XVIe siècle à Liège. Le bâti et les archives conservées permettent d'appréhender, parfois avec précision, la chronologie et les modalités de la reconstruction de cette église. Ainsi, au chantier du chœur, dont la première pierre est posée en 1511, succède le chantier du transept et de la nef, qui fait l'objet d'un contrat signé en 1539 entre le chapitre et le maître maçon Paul de Richelle. Dans cette communication, nous proposons un focus sur les quatre premières années du chantier de la nef et du transept. La période située entre 1539 et 1543 constitue en effet un moment riche en événements clefs. En mars 1540, le chapitre de la collégiale demande explicitement à ce que la façade sud de l'église soit construite en priorité. En plus de nous fournir les motivations esthétiques et pratiques de ce choix, la décision prise par les chanoines nous permet de circonscrire avec précision les travaux qui sont entamés dans un premier temps, et ainsi de pouvoir les analyser finement. De plus, cette première phase est marquée par le décès tragique de Paul de Richelle en 1541, ainsi que par l'implication dans le chantier d'une des personnalités majeures du milieu de la construction en vallée mosane. Cette communication aura donc pour but de mettre en lumière le déroulement du chantier, d'en présenter les acteurs majeurs et de mettre au jour les nombreux changements qui se sont produits dans l'intervalle de ces quatre années. En mettant en relation les données archivistiques, dont la plupart sont inédites, avec les données acquises grâce à l'étude du bâti, nous analyserons l'impact de l'ensemble de ces éléments, tant sur l'organisation du chantier que sur les choix formels et esthétiques. [less ▲]

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See detailLe contrôle du respect des droits fondamentaux de ses condamnés par la Cour pénale internationale : théorie et pratique naissante
Deprez, Christophe ULg

Conference (2017, June 23)

Cette présentation PowerPoint a servi de support à une communication orale dans le cadre de l'édition 2017 de la Conférence des Assistants en droit de Belgique (ACCA), organisée le 23 juin 2017 par l ... [more ▼]

Cette présentation PowerPoint a servi de support à une communication orale dans le cadre de l'édition 2017 de la Conférence des Assistants en droit de Belgique (ACCA), organisée le 23 juin 2017 par l'Université de Liège. [less ▲]

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See detailLa comparaison en Belgique
Delville, Michel ULg

Conference (2017, June 22)

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See detailUHPLC-ESI-MS/MS quantitation of natural estrogens in aqueous matrices as pyridine-3-sulfonyl derivatives
Glineur, Alex ULg; Ronkart, Sébastien; Nott, Kathérine et al

Conference (2017, June 22)

Natural estrogens (estrone: E1, 17-β-estradiol : E2, estriol : E3) and synthetic estrogen (17-α-ethinylestradiol: EE2) are powerful endocrine disruptors. They may have deleterious effects on aquatic ... [more ▼]

Natural estrogens (estrone: E1, 17-β-estradiol : E2, estriol : E3) and synthetic estrogen (17-α-ethinylestradiol: EE2) are powerful endocrine disruptors. They may have deleterious effects on aquatic wildlife and also humans even at extremely low concentrations. For this reason, these molecules have been included in a watch list from the European Commission regarding emerging aquatic pollutants. The maximum detection limits are set at 0.035 and 0.40 ng/L for EE2 and E1, E2 respectively. Reaching such low levels of concentration of estrogenic compounds is a challenge, even using state-of-the-art analytical methods. In this study, we developed a UHPLC-ESI-MS/MS method allowing the quantification of E1, E2, E3 and EE2 residues in aqueous matrices. Studies commonly used ESI in negative mode albeit the poor ionization efficiency of native estrogenic compounds in this mode. In this study, the molecules were derivatised using a sulfonyl chloride reagent (pyridine-3-sulfonyl, P-3-S). The resulting response in the positive mode was significantly enhanced. Similarly to other dansyl derivatives, the product ion spectra of the P-3-S derivatives indicate ions originating from the derivatization reagent moiety. Moreover, several other ions were included in the product ion spectra of the P-3-S derivatives. Their specificity was assessed by a qualitative approach implying the analysis of different types of water samples (groundwater, surface water). Some product ions were found to be noticeably better for quantification and confirmation of the analytes. The developed analytical method was validated according to the NF T90-210 norm which is suitable to assess the performances of a method in the water quality field. The limits of quantification were 0.04, 0.05, 0.10 and 0.02 ng/L in groundwater and 0.89, 0.79,4.42 and 0.29 ng/L in surface water for E1, E2, E3 and EE2 respectively. [less ▲]

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See detailSeasonal Transport in Mars’ Mesosphere revealed by Nitric Oxide Nightglow
Stiepen, Arnaud ULg

Conference (2017, June 21)

We analyze the ultraviolet nightglow in the atmosphere of Mars through Nitric Oxide (NO) δ and γ bands emissions. On the dayside thermosphere of Mars, solar extreme ultraviolet radiation partly ... [more ▼]

We analyze the ultraviolet nightglow in the atmosphere of Mars through Nitric Oxide (NO) δ and γ bands emissions. On the dayside thermosphere of Mars, solar extreme ultraviolet radiation partly dissociates CO2 and N2 molecules. O(3P) and N(4S) atoms are carried by the day-to-night hemispheric transport. They preferentially descend in the nightside mesosphere in the winter hemisphere, where they can radiatively recombine to form NO(C2Π). The excited molecules promptly relax by emitting photons in the UV δ bands and in the γ bands through cascades via the A2Σ, v’ = 0 state. These emissions are thus indicators of the N and O atom fluxes transported from the dayside to Mars’ nightside and the winter descending circulation pattern from the nightside thermosphere to the mesosphere (e.g. Bertaux et al., 2005 ; Bougher et al., 1990 ; Cox et al., 2008 ; Gagné et al., 2013 ; Gérard et al., 2008 ; Stiepen et al., 2015, 2017). Observations of these emissions have been accumulated on a large dataset of nightside disk images and vertical profiles obtained at the limb by the Imaging Ultraviolet Spectrograph (IUVS, McClintock et al., 2015) instrument when the Mars Atmosphere and Volatile EvolutioN (MAVEN) spacecraft is at its apoapsis and its periapsis phases along its orbit, respectively. We present discussion on the variability in the brightness and altitude and of the emission with season, geographical position and local time and possible interpretation for local and global changes in the mesosphere dynamics. IUVS images and limb scans reveal unexpected complex structure of the emission. The brightest emission is observed close to the winter pole. The emission is also surprisingly more intense in some longitude, revealing possible impact of tides and waves in Mars’ nightside mesosphere. Observations also reveal spots and streaks, indicating irregularities in the wind circulation pattern. The disk images and limb profiles are compared to the LMD-MGCM model (Gonzàlez-Galindo et al., 2009 ; Lopez-Valverde et al., 2011) to focus on the seasonal, local time and geographical influences on the NO Nightglow emission. We will also provide a statistical study of the regions of enhanced brightness (i.e. splotches and streaks) and discuss possible interpretation from the comparison to the GCM. [less ▲]

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See detailL’art de gouverner les régions par les finances publiques
Piron, Damien ULg

Conference (2017, June 21)

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See detailConclusions of the 6th European Drying Conference
Léonard, Angélique ULg

Conference (2017, June 21)

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See detailImpact of conditioning on sludge internal structure evolution during drying
Fraikin, Laurent ULg; Pambou, Yvon Bert; Salmon, Thierry ULg et al

Conference (2017, June 20)

This paper investigated the influence of dual conditioning of waste water treatment sludge on the evolution of sludge internal structure during convective drying. Results showed clearly an impact of ... [more ▼]

This paper investigated the influence of dual conditioning of waste water treatment sludge on the evolution of sludge internal structure during convective drying. Results showed clearly an impact of chemical conditioners on the evolution of the created porosity. For sludge flocculated by single conditioning, a centered porosity delimiting by external crust was shown, while for dual conditioning, a porosity structured in lamellae, was identified. [less ▲]

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See detailCharacterisation of Luvisol compaction under two different tillage systems and field traffic zones by assessing soil mechanical properties
Taguem Ngoualadjio, Eric Martial ULg; Destain, Marie-France ULg; ROISIN, Christian et al

Conference (2017, June 20)

Compaction of arable soils is a consequence of tillage systems and agricultural machinery traffic year after year. Its negative effects on crop production and on the environment have been put into ... [more ▼]

Compaction of arable soils is a consequence of tillage systems and agricultural machinery traffic year after year. Its negative effects on crop production and on the environment have been put into evidence by several studies. However, soil compaction is a complex phenomenon and the understanding of the involved mechanisms related to agricultural practices still remains limited. This contribution aims to study the influence of the interaction between traffic intensity and tillage system on soil compaction. Soil samples were taken from topsoil (0.07-0.25 m), plough pan (0.30-0.35 m) and subsoil (0.35 – 0.52 m), on plots under long-term reduced tillage (RT) and conventional tillage (CT). For each tillage system, intensive traffic zones (IT) and non-intensive traffic zones (NT) were considered. Swelling index (Cs), compression index (Cc), precompression stress (Pc) obtained by oedometer test, porosity (n) and water content obtained by gravimetric determination were chosen to characterise the soil mechanical properties. An analysis of covariance (ANCOVA) was performed to study the effect of the depth, the tillage and the traffic intensity on the variables measured, with the water content as covariable. The results show that, after ten years of reconversion from CT to RT, the plough pan is still present in RT and its compaction appears as important as in CT ( nRT-30cm = 36.9% , nCT-30cm = 38.0%, p-value = 0.098). In subsoil, the compression index was high in CT, as well as in RT (CcRT = 0.150 kPa-1, CcCT = 0.148 kPa-1, p-value = 0.617), involving that this layer remains susceptible to compaction under heavy loads. Moreover, the mean value of the precompression stress (meanPc = 92±34 kPa) remains lower than stresses induced by heavy machines such as beet harvesters. The results also show that the presence of two traffic zones induces a spatial heterogeneity in the field (CcIT = 0.138 kPa-1; CcNT = 0.154 kPa-1, p-value = 0.031). These main results could be used in computational modelling to develop decision support systems to mitigate the effects of soil compaction. [less ▲]

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See detailOptimization of an electrophoretic approach for the screening and the development of new antithrombotic drugs
Farcas, Elena ULg; Bouckaert, Charlotte; Servais, Anne-Catherine ULg et al

Conference (2017, June 20)

The discovery of lead compounds that can modulate the activity of a biological target is essential to provide efficient pharmacological tools and to serve as starting points for new drug generations ... [more ▼]

The discovery of lead compounds that can modulate the activity of a biological target is essential to provide efficient pharmacological tools and to serve as starting points for new drug generations. Fragment-based drug discovery (FBDD) approach is an attractive tool for the identification of new selective inhibitors of a target of interest, but its success largely depends on the ability to develop screening bioassays capable to detect and gauge weak affinity binders. To achieve this goal, we investigated capillary electrophoresis (CE) for identifying and ranking fragments from an initial library. Indeed, due to its ability to evaluate weak interactions, CE seems to be promising for fragment-based screening. This technique is a powerful analytical tool with a unique separation mechanism, speed, efficiency and versatility. Its main advantages are low protein consumption, higher throughput compared to NMR and X-ray crystallography and the fact that screening can be carried out using native protein in physiological solution without the need of immobilization. We developed a proof of concept study on thrombin, a serine protease implicated in the coagulation cascade using affinity capillary electrophoresis (ACE) for ranking fragments from an initial library. For this study, we followed a probe ligand, benzamidine, and we investigated interactions with the target by monitoring the changes of its electrophoretic mobility upon binding. The first step of this study consisted in the optimization of the experimental conditions suitable for the CE method (target and probe ligand concentrations, separation buffer composition, voltage, separation effective length, target partial filling…). Then, numerous thrombin inhibitors with a wide range of inhibitory potency (i.e. Ki 200 µM – 5 nM) were tested to validate our system demonstrating the possibility to fish binders in the optimized conditions. We also checked the absence of non-specific binding with the target using the inactivated enzyme at the binding site. It is noteworthy that in this operating system (ACE assay), binding occurs in free solution using physiological buffers, thus preventing artifacts that may result from target immobilization, which is a requirement for some techniques such as SPR. [less ▲]

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See detailDiametral dimension(s) and prominent bounded sets
Demeulenaere, Loïc ULg

Conference (2017, June 20)

The classical diametral dimension (Bessaga, Mityagin, Pelczynski, Rolewicz), denoted by "Delta", is a topological invariant which can be used to characterize Schwartz and nuclear locally convex spaces ... [more ▼]

The classical diametral dimension (Bessaga, Mityagin, Pelczynski, Rolewicz), denoted by "Delta", is a topological invariant which can be used to characterize Schwartz and nuclear locally convex spaces. Mityagin also introduced a variant of this diametral dimension, denoted by "Delta_b", using bounded sets in its definition, contrary to "Delta". In this talk, we present some conditions assuring the equality of these two diametral dimensions for Fréchet spaces. Among these conditions, there is the notion of existence of prominent bounded sets, due to Terzioglu. In fact, it appears that the existence of prominent sets is implied by the property "Omega Bar" of Vogt and Wagner. Finally, we describe a construction which gives Schwartz and nuclear non-Fréchet spaces E verifying "Delta_b(E) = \Delta(E)". [less ▲]

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See detailRelease of Neutrophils Extracellular Traps as a main trigger for asthma onset
Radermecker, Coraline ULg; Sabatel, Catherine ULg; Toussaint, Marie et al

Poster (2017, June 20)

Allergic asthma is an important Th2 associated immunopathology. Even if the pathology of the disease is well described, its etiology is still largely unknown. Nevertheless, some environmental factors like ... [more ▼]

Allergic asthma is an important Th2 associated immunopathology. Even if the pathology of the disease is well described, its etiology is still largely unknown. Nevertheless, some environmental factors like viral infections and exposition to low doses of lipopolysaccharide (LPS) strongly increase the risk of disease inception. Interestingly, these two particular risk factors both induce a strong recruitment of neutrophils into the lung. Recently, scientists highlighted the ability of neutrophils to form neutrophils extracellular traps (NETs) composed of a network of extracellular DNA associated to anti-microbial peptides. NETs release (or NETosis) is an important component in organism defence against pathogen invasion but has also been identified as initiator of pathophysiological conditions like erythematous systemic lupus, gout and diabetes. In this study, we investigated the role of NETs as potential asthma inducers in specific pro-Th2 environmental risk factors like respiratory viral infections and low LPS doses exposures (also known as hygiene hypothesis). First, we assessed the correlation between respiratory viral infection or low LPS exposure and NETosis using western blot and confocal microscopy analysis. An influenza A infection induced a strong NETs release between day three and seven after viral inoculation whereas exposition to low (100 ng LPS) but not to high (10 µg LPS) LPS doses also promoted NETosis within 24 hours following the exposition. Then we developed two mouse models, a virus-induced asthma model and a model of asthma promoted by exposition to low LPS doses. In these models, only previously infected mice or mice exposed to low LPS doses displayed all the characteristics of allergic asthma following sensitization and challenge to house dust mite (HDM). The role of NETs in asthma onset was then demonstrated using three NETosis inhibitors (DNAse, Cl-amidine and inhibitor of neutrophil elastase) in our models as infected or low LPS doses exposed mice exhibited strong decreased of all key asthma features when treated with NETs inhibitors compared to non-treated mice. Finally, to address how NETs could lead to a TH2 immune response, we analysed by flow cytometry the distinct subpopulations of lung dendritic cells (DCs) in our two mice models. We observed, during the NETs release phase, a recruitment of monocytic derived DCs (moDCs). In conclusion, we have demonstrated an unexpected role for NETs in asthma onset by recruiting lung moDCs. [less ▲]

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See detailDEVELOPMENT OF A MULTISCALE CONVECTIVE LABSCALE DRYER
Fraikin, Laurent ULg; Salmon, Thierry ULg; Léonard, Angélique ULg

Poster (2017, June 19)

The convective drying technology is currently used in many industries but the industrial process is frequently poorly mastered and some design security factors are used. The lack of optimized conception ... [more ▼]

The convective drying technology is currently used in many industries but the industrial process is frequently poorly mastered and some design security factors are used. The lack of optimized conception rules lead to large energy consumptions. In the same perspective, the use of superheated steam as drying fluid expands and requests the improvement of the knowledge about this specific drying process. For this goal, the PEP’s developed a new convective labscale dryer to conduct various studies. This article presents the new dryer called VESAC. [less ▲]

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Peer Reviewed
See detailOptimiaztion of an electrophoretic approach for the screening and the development of new antithrombotic drugs
Farcas, Elena ULg; Bouckaert, Charlotte; Servais, Anne-Catherine ULg et al

Poster (2017, June 19)

The discovery of lead compounds that can modulate the activity of a biological target is essential to provide efficient pharmacological tools and to serve as starting points for new drug generations ... [more ▼]

The discovery of lead compounds that can modulate the activity of a biological target is essential to provide efficient pharmacological tools and to serve as starting points for new drug generations. Fragment-based drug discovery (FBDD) approach is an attractive tool for the identification of new selective inhibitors of a target of interest, but its success largely depends on the ability to develop screening bioassays capable to detect and gauge weak affinity binders. To achieve this goal, we investigated capillary electrophoresis (CE) for identifying and ranking fragments from an initial library. Indeed, due to its ability to evaluate weak interactions, CE seems to be promising for fragment-based screening. This technique is a powerful analytical tool with a unique separation mechanism, speed, efficiency and versatility. Its main advantages are low protein consumption, higher throughput compared to NMR and X-ray crystallography and the fact that screening can be carried out using native protein in physiological solution without the need of immobilization. We developed a proof of concept study on thrombin, a serine protease implicated in the coagulation cascade using affinity capillary electrophoresis (ACE) for ranking fragments from an initial library. For this study, we followed a probe ligand, benzamidine, and we investigated interactions with the target by monitoring the changes of its electrophoretic mobility upon binding. The first step of this study consisted in the optimization of the experimental conditions suitable for the CE method (target and probe ligand concentrations, separation buffer composition, voltage, separation effective length, target partial filling…). Then, numerous thrombin inhibitors with a wide range of inhibitory potency (i.e. Ki 200 µM – 5 nM) were tested to validate our system demonstrating the possibility to fish binders in the optimized conditions. We also checked the absence of non-specific binding with the target using the inactivated enzyme at the binding site. It is noteworthy that in this operating system (ACE assay), binding occurs in free solution using physiological buffers, thus preventing artifacts that may result from target immobilization, which is a requirement for some techniques such as SPR. [less ▲]

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See detailSTUDY ON THE STRUCTURAL EVOLUTION OF SEWAGE SLUDGE DURING CONVECTIVE DRYING
Li, Jie; Fraikin, Laurent ULg; Salmon, Thierry ULg et al

Poster (2017, June 19)

The structure of the sludge sample continues changing during drying as a result of the shrinkage phenomenon. Then the exchange area becomes smaller and the drying rate decreases. The sludge collected in a ... [more ▼]

The structure of the sludge sample continues changing during drying as a result of the shrinkage phenomenon. Then the exchange area becomes smaller and the drying rate decreases. The sludge collected in a wastewater treatment plant (Grosses Battes WWTP, Belgium) was chosen for both lab-scale experiment and pilot-scale experiment. X-ray macrotomography (resolution: 0.36 mm per pixel) and X-ray microtomography (resolution: 41 μm per pixel) were used to explore the structure evolution of the sludge bed and the single extrudate respectively. 2D cross-sections of the sludge bed and the single extrudate were acquired, which supply a convenient way to investigate the evolution of the structure. The results show that the structure of both the sludge bed and the single extrudate distinctly changes during the drying process. [less ▲]

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See detailChromatographic analysis of alkaloids in Aconitum pollen : towards new insights in plant protection mechanisms
Vanderplanck, Maryse ULg; Glauser, Gaëtan; Tyteca, Eva ULg et al

Conference (2017, June 19)

Alkaloids are a class of naturally occurring organic nitrogen-containing bases that are found primarily in plants. They display a huge diversity with more than 3,000 different types already identified ... [more ▼]

Alkaloids are a class of naturally occurring organic nitrogen-containing bases that are found primarily in plants. They display a huge diversity with more than 3,000 different types already identified. Next to their different pharmacological and therapeutic effects, alkaloids can have a deleterious impact on organisms as they are known to be neurotoxic and cardiotoxic for mammals and insects. In the current context of worldwide bee decline, occurrence of such compounds in floral production, i.e. nectar and pollen, raises major concerns. They could be beneficial to bees by protecting them against disease and pathogens but they could also cause toxicity. Until now alkaloids, and their effect on human health, are mainly studied in vegetative parts of plants. More recently the natural occurrence of alkaloids in nectar was also studied to investigate their effect on bee health. Whereas nectar chemicals can relatively easily and quickly be analyzed by chromatography, extracting chemicals from low pollen amount remains a challenge because of pollen structure and complexity. However, characterization of pollen chemicals can lead to valuable insight in their impact on pollinators allowing the development of mitigation strategies. In this study, we used a UHPLC-(ESI)-Q-ToF/MS method allowing the identification and quantification of alkaloids in pollen matrices from four Aconitum species; A. lycoctonum, A. napellus compactum, A. napellus neomontanum and A. variegatum. Alkaloid extraction was performed using bead-beating disruption of the pollen sample and chromatographic analysis was carried out on an Acquity UPLC system interfaced with a Synapt G2 QTOF. The separation was achieved in gradient mode on an Acquity UPLC BEH C18 column and detection was performed in electrospray positive ionization mode (ES+). Alkaloid concentrations were measured as aconitine equivalents by using a pure aconitine standard as reference compound. The total amount of alkaloids in Aconitum pollen ranged from 0.75 to 1.20 mg/g with 859 different compounds detected, some of them being pollen-specific. Statistical analyses were conducted on the global dataset to assess both quantitative and qualitative interspecific differences. One-way analysis of variance was performed on the total alkaloid content while a permutational test of multivatiate analysis of variance was used to compare the alkaloid profiles among the four Aconitum species. Results are briefly discussed in an ecological context. [less ▲]

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See detailMODELING MOISTURE TRANSFER OF MORTAR SUBMITED TO CONVECTIVE DRYING
Kahlerras, Loubna ULg

Poster (2017, June 19)

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See detailGeneralized Pascal triangles for binomial coefficients of finite words
Stipulanti, Manon ULg

Conference (2017, June 19)

We introduce a generalization of Pascal triangle based on binomial coefficients of finite words. These coefficients count the number of times a finite word appears as a subsequence of another finite word ... [more ▼]

We introduce a generalization of Pascal triangle based on binomial coefficients of finite words. These coefficients count the number of times a finite word appears as a subsequence of another finite word. Similarly to the Sierpiński gasket that can be built as the limit set, for the Hausdorff distance, of a convergent sequence of normalized compact blocks extracted from Pascal triangle modulo 2, we describe and study the first properties of the subset of [0, 1] × [0, 1] associated with this extended Pascal triangle modulo a prime p. Then we create a new sequence from this extended Pascal triangle that counts, on each row of this triangle, the number of positive binomial coefficients. We show that this sequence is 2-regular. To extend our work, we construct a Pascal triangle using the Fibonacci representations of all the nonnegative integers and we define the corresponding sequence of which we study the regularity. This regularity is an extension of the classical k-regularity of sequences. [less ▲]

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See detailENMG du pied (atelier)
WANG, François-Charles ULg

Conference (2017, June 17)

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See detailFirst Characterization of the Volatile Organic Compounds Emitted by Banana Plants (Musa sp.)
Berhal, Chadi ULg; De Clerck, Caroline ULg; LEVICEK, Carolina et al

Conference (2017, June 16)

Banana fruit (Musa sp.) ranks fourth in developing world's production, and has economical and nutritional key values. The popular and most dominant variety of the dessert banana group is the Cavendish ... [more ▼]

Banana fruit (Musa sp.) ranks fourth in developing world's production, and has economical and nutritional key values. The popular and most dominant variety of the dessert banana group is the Cavendish variety, and Plantain represents that status for the cooking banana group. Despite the importance of the Volatile Organic Compounds (VOCs), which are secondary metabolites with a high vapour pressure, in their utility in the plant protection and communication processes, they were never documented for the plant itself. Thus, the aim of this PHD thesis is to study the VOCs emitted by the plant, rather than their fruits or flowers. A protocol was optimized for the extraction of the banana plant's VOCs. The results of the first analysis showed 11 VOCs for the Cavendish, mainly (E,E)-α-farnesene (87.90 ± 11.28 ng/µl), methyl salicylate (33.82 ± 14.29) and 6-methyl-5-hepten-2-one (29.60 ± 11.66), and 14 VOCs for the Pacific Plantain cultivars, mainly (Z,E)-α-farnesene (799.64 ± 503.15),(E,E)-α-farnesene (571.24 ± 381.70) and (E) β ocimene (241.76 ± 158.49). Most of these compounds belong to the terpenes group (8 for Cavendish, 10 for Pacific Plantain). The other compounds detected were ketones, esters and aldehydes. Eight compounds were common between the two varieties (myrcene, Z and E β-ocimene, 6-methyl-5-hepten-2 one, 6-methyl-3,5-hepadien-2-one, a-farnesene, methyl salicylate and β-ionone). This exploratory study paves the way for an in-depth characterisation of VOCs emitted by Musa plants. [less ▲]

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Peer Reviewed
See detailRelevance of early stretching in overhead athletes
Schwartz, Cédric ULg; Tubez, François ULg; Croisier, Jean-Louis ULg et al

Conference (2017, June 16)

Overhead athletes often develop, over time, a tightness of the posterior structures of the shoulder, which may be associated with injuries. Ten symptomatic (with pain) and ten asymptomatic players with a ... [more ▼]

Overhead athletes often develop, over time, a tightness of the posterior structures of the shoulder, which may be associated with injuries. Ten symptomatic (with pain) and ten asymptomatic players with a tight shoulder were compared and the effect of a self-applied stretching program was evaluated. Before and after the stretching program, pain and stiffness of the shoulder were evaluated. Our results demonstrate that risk factors for shoulder pain such as glenohumeral internal rotation deficit and total range of motion deficit may only be limited in symptomatic athletes. The mobility of the shoulder was significantly improved after the stretching program for both groups. Pain was reduced when present. Because of the limited differences between the symptomatic and asymptomatic athletes, clinicians may find it advantageous to initiate early prevention or rehabilitation programs. [less ▲]

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See detailLe cartoon. Réflexions sur la culture populaire aux États-Unis
Moreau, Timothée ULg

Conference (2017, June 16)

The aim of this paper is to propose an analysis of the cartoon and its place in popular culture from two different yet connected angles: the idea of "pop culture", linked to mass culture and its critique ... [more ▼]

The aim of this paper is to propose an analysis of the cartoon and its place in popular culture from two different yet connected angles: the idea of "pop culture", linked to mass culture and its critique/analysis by Adorno & Horkheimer and Benjamin ; and the idea of "folk culture", linked to the notion of grotesque as it is developped by Bakhtin. The main idea is that those two paths of analysis are connected through the notion of ambivalence and their link to political conceptions of a particular society and the culture that emerges from it. [less ▲]

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