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See detailVoltage Profile Correction in Distribution Grids Combining Single- and Two-level Controllers
Soleimani Bidgoli, Hamid ULg; Van Cutsem, Thierry ULg

in IEEE PES 2017 PowerTech conference proceedings (2017, June)

A real-time control scheme is proposed to correct undesired voltages in distribution networks by adjusting the reactive powers produced by Dispersed Generation Units (DGUs). This is performed at two ... [more ▼]

A real-time control scheme is proposed to correct undesired voltages in distribution networks by adjusting the reactive powers produced by Dispersed Generation Units (DGUs). This is performed at two levels: locally, in DGU controllers, and centrally by a supervisory controller acting on some of the DGUs only. The centralized, discrete controller solves a multi-time-step constrained optimization inspired of Model Predictive Control. Unacceptable voltage deviations are partially but rapidly corrected by the local controls. Further but slower corrections are applied by the upper level, taking advantage of the coordination between DGUs. This hybrid control is of practical interest where the deployment of the upper level control is not feasible or affordable over all DGUs. The proposed method effectiveness is demonstrated on a 75-bus test system. [less ▲]

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See detailQuantification of serum androstanediol glucuronide
LE GOFF, Caroline ULg

in Clinical Chemistry and Laboratory Medicine (2017, June)

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See detailEvaluation of Non-negative matrix Factorization of grey matter in age prediction
Varikuti, Deepthi; Genon, Sarah ULg; Sotiras, Aristeidis et al

Poster (2017, June)

Introduction: It has been shown that machine-learning methods applied to voxel-based morphometry (VBM) data allows the prediction of brain age [1]. Dimensionality reduction is a critical aspect of such ... [more ▼]

Introduction: It has been shown that machine-learning methods applied to voxel-based morphometry (VBM) data allows the prediction of brain age [1]. Dimensionality reduction is a critical aspect of such brain-based prediction of phenotypical characteristics to counter the curse of dimensionality associated with voxel-wise analysis. While previous age-predictions have employed PCA based compression, non-negative matrix factorization (NNMF) has recently been suggested as a plausible factorization of high-dimensional VBM data [4]. Non-negativity and sparsity of the components obtained from NNMF facilitate relatively more optimal solution than the PCA based compression [4]. Here, we evaluate, i) whether NNMF compression allows predictions of biological age that reproduce those from previously reported analyses [2], ii) the impact of the NNMF’s granularity on the prediction accuracy, iii) the possible effect of the factorizations derived from different datasets on the prediction, and iv) whether explicit adjustment can address the model bias inherent to many brain-based predictions. Methods: VBM8 preprocessing (using only non-linear modulation and 8 mm FWHM smoothing [3]) was used to compute voxel-wise GM volumes for two datasets, 1) 693 healthy older adults (age: 55-75 years) scanned at a single site (“1000BRAINS) [1], 2) 1084 healthy adults (age: 18-81 years), scanned at multiple sites (“Mixed”) (Fig 1A). NNMF solutions for both groups were derived at different levels of granularity. Age prediction was performed by fitting LASSO regression models either on the coefficient matrix from the respective NNMF or by those that were derived from projecting a group’s data on the respective other groups components. Model generalization was evaluated by 10-fold cross-validation replicated 25 times. To address the known bias towards the mean, i.e., overestimation of young and underestimation of older subjects, we additionally tested models that explicitly fitted the regression-slope between the real and predicted training set and used this to adjust the expected slope of the test set to 45 degrees. Results: In both datasets, NNMF components resembled neurobiologically reasonable patterning of the brain (Fig 1B). Prediction accuracy based on the projection of data on the components from either group was virtually identical (Fig 2A). For both datasets, mean absolute errors (MAE) declined with higher granularity of the components and reached values well comparable to previous approaches even when using components derived from an independent sample (MAE: 3.6 years for 1000BRAINS; 6.4 years for Mixed). Plotting the prediction error relative to the biological age of the subjects revealed the bias towards the mean across both datasets (Fig 2B). Adjusting for the slope estimated in the training set allows removing this bias, though it needs to be noted that this comes at the cost of reduced precision, i.e., unbiased estimates yield a slightly higher MAE. Conclusion: NNMF allows the definition of co-variation patterns in VBM data. Due to the non- negativity and sparseness, NNMF enable substantially easier and higher biological interpretation than other methods for data compression such as PCA [4]. We showed that NNMF compression of VBM data over the lifespan allows predicting previously unseen subjects’ age with a precision that is comparable to earlier reports using PCA for data compression [2], while offering the potential for neurobiological interpretation. Importantly, accuracy seems to be independent of whether the components were derived from the same dataset or from a dataset that is not only independent but also different in age distribution. We note that accuracies tend to continuously decrease with higher granularity, although performance tends to plateau at about 300 components. Finally, adjusting the inherent bias of sparse regression models yields unbiased out-of-sample predictions but comes at the expense of slightly higher mean errors. [less ▲]

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

Conference (2017, June)

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See detailMindfulness in Cyber-Security: The Case of a Government Agency
Tapanainen, Tommi ULg; Lisein, Olivier ULg

Conference (2017, June)

Cyber-security requires not only technical preparations but also organizational practices that reduce the likelihood and severity of damage to the organization. Although user compliance to security ... [more ▼]

Cyber-security requires not only technical preparations but also organizational practices that reduce the likelihood and severity of damage to the organization. Although user compliance to security policies has been examined in prior literature, user behaviour is only one facet of an organization’s cyber-security; the actions of the IT staff, crisis team, and the management are just as critical. Consequently, organizational practices in cyber-security are not understood very well. To address this gap, this research applied the concept of mindfulness, which has recently received attention also in the IT field. We collected data from a revelatory case – that of a government agency that was targeted by a large-scale cyber-attack – and applied the concept of mindfulness in analyzing the data. Our analysis uncovered a number of mindful practices related to cyber-security. These practices can serve as a building block to theorize on the activities to be taken by IT workers in promoting cyber-security. Our paper also suggests avenues for further research in the emerging topic, for instance, through the concept of cyber-security capability. [less ▲]

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See detailUnravelling the secret of the resistance of desert strains of Chroococcidiopsis to desiccation and radiation
Billi, Daniela; Fagliarone; Verseux, Cyprien et al

in Van de Putte, Anton (Ed.) Book of abstracts: XIIth SCAR Biology Symposium, Leuven, Belgium, 10-14 July 2017. (2017, June)

Chroococcidiopsis is a unicellular cyanobacterial genus that is growing in extreme dry conditions, either in low or high temperatures. At the lower end of the spectrum, they live as cryptoendoliths in ... [more ▼]

Chroococcidiopsis is a unicellular cyanobacterial genus that is growing in extreme dry conditions, either in low or high temperatures. At the lower end of the spectrum, they live as cryptoendoliths in rocks of the Mc Murdo Dry Valleys in Antarctica where they were discovered by Imre Friedmann, while at the higher end, they grow as hypoliths/endoliths in hot deserts, e.g. Negev, Gobi, Atacama. The capacity of desert strains of Chroococcidiopsis to stabilize their sub-cellular organization is so efficient that, when dried, they can cope with simulated space and Martian conditionsas well as with high doses of ionizing and UV radiations . [less ▲]

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See detailIntermodal transport: does a wider definition improve its competitiveness?
Mostert, Martine ULg; Limbourg, Sabine ULg; Caris, An

Conference (2017, June)

With the opening of borders and always greater decentralization of production, freight transport increased a lot in the last decades. Road remains the most used mode in Europe (Eurostat, 2016). Even if it ... [more ▼]

With the opening of borders and always greater decentralization of production, freight transport increased a lot in the last decades. Road remains the most used mode in Europe (Eurostat, 2016). Even if it is appreciated for its responsiveness, flexibility, and quickness, road transport is however responsible for negative impacts on its environment like air pollution or climate change. Intermodal freight transport i.e. the transportation of goods using two or more modes of transport, in the same loading unit, without handling of the goods themselves (United Nations, 2001) is identified by the European Commission (2011) as an interesting solution for limiting the negative impacts of transport. In the classical conception of intermodal transport, pre- and post-haulage travels are supposed to be short, and to be performed by road transport, whereas the long-haul travel is done using rail or IWW. The combination of these modes allows reducing the negative externalities of the whole travel, i.e. the negative impacts that are generated by transport operators, but which are not directly supported by them. These externalities in particular consist in air pollution and climate change, provoked by the release of emissions which lead to air pollution and human health problems. The objective of this study is to determine the impact on intermodal attractiveness of allowing other combinations of modes than the classical road-rail/IWW-road combination, during an intermodal travel. The research is based on tools of the operations research domain and proposes the development of an allocation model for freight transport at the strategic level of decision. The goal is to determine the flow distribution of goods between direct transportation by road, rail or inland waterways, and any combination of these modes using intermodal transport. The novelty consists in taking into account three modes of transport in a mixed integer programming model, and to allow the transfer from any mode to any other at intermodal terminals where these modes coexist. [less ▲]

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See detailTree Ensemble Methods and Parcelling to Identify Brain Areas Related to Alzheimer’s Disease
Wehenkel, Marie ULg; Bastin, Christine ULg; Phillips, Christophe ULg et al

in 2017 International Workshop on Pattern Recognition in Neuroimaging (PRNI), proceedings (2017, June)

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See detailVariable selection in proportional hazards cure model with time-varying covariates, application to bank failures
Beretta, Alessandro ULg; Heuchenne, Cédric ULg

Conference (2017, June)

In the last three decades, as a consequence of failures and corporate actions, the number of commercial banks in the United States has shrunk by two thirds. Empirical evidence in the analysis of bank ... [more ▼]

In the last three decades, as a consequence of failures and corporate actions, the number of commercial banks in the United States has shrunk by two thirds. Empirical evidence in the analysis of bank failures suggests the existence of banks which are not susceptible to default. For this reason, we use a semi-parametric proportional hazards cure model with time-varying covariates to study their effects either on the probability that a bank is susceptible to default and on the survival time of failed institutions. We propose a penalized maximum likelihood method for the selection of the most significant variables, using a Smoothly Clipped Absolute Deviation (SCAD) penalty. A simulation study shows that this procedure performs reasonably well. We apply this methodology to a quite large sample of United States commercial banks insured by the Federal Deposit Insurance Corporation (FDIC) and with more than 50 million dollars of total assets during the last quarter of 2002. More in detail, we use bank-specific covariates observed on a quarterly basis until the end of 2015, that we use as proxies for capital adequacy, asset quality, earnings, management efficiency, liquidity, cost structure and size. [less ▲]

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See detailImpact of 3’-­‐sialyllactose and Bifidobacterium crudilactis on infant feces microbial composition and virulence modulation of Escherichia coli O157:H7, using the SHIME® gastrointes6nal model
Bondue, Pauline ULg; Lebrun, Sarah ULg; Crevecoeur, Sébastien ULg et al

Poster (2017, June)

Bifidobacterium crudilactis, a bacterial species from bovine origin, growths on bovine milk oligosaccharides (BMO). Cell free spent media (CFSM) from B. crudilactis and 3’-sialyllactose (3’SL), a major ... [more ▼]

Bifidobacterium crudilactis, a bacterial species from bovine origin, growths on bovine milk oligosaccharides (BMO). Cell free spent media (CFSM) from B. crudilactis and 3’-sialyllactose (3’SL), a major BMO, modulated Escherichia coli O157:H7 virulence gene expressiona. In this study, the SHIME® gastrointestinal model was inoculated with 4 different treatments: 3’SL (ttm1), B. crudilactis (ttm2), 3’SL and B. crudilactis (ttm3) and CFSM from 3’SL and B. crudilactis culture (ttm4). In each section of the colon, samples were collected and analysed for short chain fatty acid (SCFA) concentration using HPLC, microbial populations using 16S rDNA metagenetic analysis and correlated with E. coli O157:H7 virulence gene expression. The results showed that SCFA levels were stable during the experiments. Metagenetic analysis showed a microbial diversity in transverse (TC) and descending colon (DC) close to feces, dominated by Bacteroides, Prevotella and Fusobacterium, while the ascending colon (AC) showed a different microbial diversity dominated by Veillonella. Ttm4 and ttm2 induced mainly a down-regulation of virulence genes: fliC in DC with ttm4, and luxS, stx1, qseA in AC, DC or TC with ttm2. Ttm1 also showed a down-regulation of fliC in DC, similar to the one observed with ttm4, but this was associated with an up-regulation of fliC and stx1 in AC or TC. Finally, ttm3 showed slight upregulation of ler, fliC and qseA in AC. These results show that ttm4 and ttm2 might have a positive effect against virulence expression of E. coli O157:H7. However, this trend has to be validated with the further replicates on the SHIME® system. [less ▲]

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See detailDocumenting the parameters of effective SoTL counselling
Jérôme, Françoise ULg; Verpoorten, Dominique ULg; Detroz, Pascal ULg

in Andersson, Roy; Martensson, Katarina; Roxa, Torgny (Eds.) Proceedings of the 2nd EuroSoTL Conference (2017, June)

The Specialized Master in Higher Education Pedagogy (Formasup) organized at the University of Liège (Belgium) aims at the professional development of teachers involved in Higher Education. The training ... [more ▼]

The Specialized Master in Higher Education Pedagogy (Formasup) organized at the University of Liège (Belgium) aims at the professional development of teachers involved in Higher Education. The training programme gives participants the opportunity to make a full-scale SoTL study (from the implementation of a well-circumscribed course regulation to the assessment of its pedagogical effectiveness by means of the analysis of collected data) of one prominent aspect of their teaching practice. The process of trying out some new pedagogical approach and of discussing its effects on student learning has also to be reported in the form of a scientific paper (including a short review of the relevant pedagogical literature) and presented to a small audience of teacher colleagues. In order to meet the many requirements of such a complex task, each participant benefits from individualized pedagogical counselling. Besides a brief description of the Formasup context, the present contribution proposes brief case studies of three SoTL projects carried out in 2016. The case studies focus mainly on the dynamics of the interaction between teacher and pedagogical counsellor at each constitutive step of the SoTL project with the intention of making out the specificities of counselling applied to first time SoTL experience (time dedicated to and types of counselling activities in relation to the particularities of individual projects). The case studies are then integrated into a bigger picture drawing upon a larger number of counselling experiences over the last four years (from 2013 to 2016). On the basis of the main characteristics of 21 counselling experiences we propose a typology of teacher profiles according to their strategic approach to SoTL and the corresponding input of counselling. [less ▲]

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See detailDevelopment of a unified model for flow-material interaction applied to porous charring ablators
Coheur, Joffrey ULg; Schrooyen, Pierre; Turchi, Alessandro et al

Conference (2017, June)

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See detailDecoding the disciplines – A pilot study at the University of Liège (Belgium)
Verpoorten, Dominique ULg; Devyver, Julie ULg; Duchâteau, Dominique ULg et al

in Andersson, Roy; Martensson, Katarina; Roxa, Torgny (Eds.) Proceedings of the 2nd EuroSoTL Conference - Transforming patterns through the scholarship of teaching and learning (2017, June)

This paper reports on a first attempt to apply the two first stages of the “Decoding the disciplines” framework (Pace, 2017) at the University of Liège (Belgium). In this context, 7 professors volunteered ... [more ▼]

This paper reports on a first attempt to apply the two first stages of the “Decoding the disciplines” framework (Pace, 2017) at the University of Liège (Belgium). In this context, 7 professors volunteered to reflect, through a structured process, upon “bottlenecks” in their courses, with the help of IFRES’ (Institute for Training and Research in Higher Education) pedagogical advisers. This pilot delivered contrasted observations: while participants granted value to their exposure to this approach, especially in terms of enhanced awareness of possible discrepancies between what experts and newcomers in the field might consider as obvious, none of them activated the possibility offered to tackle the identified bottlenecks, according to the systematic approach (stages 3-7) suggested by the framework. The paper presents the pedagogical setting, analyses the interviews of participants and the outcomes of the project, outlines explanations for its results, and shares some lessons learnt. [less ▲]

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See detailShallow water model with anisotropic porosity for flood modelling on Cartesian grids
Bruwier, Martin ULg; Archambeau, Pierre ULg; Erpicum, Sébastien ULg et al

Conference (2017, June)

Detailed topographic data have become widely available for inundation mapping. While the use of such high-resolution data enables the computation of flow variables at a fine scale, the computation time ... [more ▼]

Detailed topographic data have become widely available for inundation mapping. While the use of such high-resolution data enables the computation of flow variables at a fine scale, the computation time remains too high for many practical applications. In contrast, models solving the shallow-water equations with porosity provide a useful tool to improve the computational efficiency, while preserving to some extent the detailed topographic information through porosity parameters. In this study, we present a new model solving the fully dynamic shallow water equations with anisotropic porosity based on Cartesian grids. Using a Cartesian grid leads to specific challenges, particularly as regards the definition of the conveyance porosities at the cell edges. Moreover, the presented model is further improved by a merging method so as to increase the computational efficiency without affecting the overall accuracy. The performance of the model has been evaluated based on a wide range of test cases, which confirm the validity of the model and the benefits of such a modelling framework. [less ▲]

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See detailEfficient management of a connected microgrid in Belgium
Cornélusse, Bertrand ULg; Ernst, Damien ULg; Warichet, Luc et al

in Proceedings of the 24th International Conference on Electricity Distribution, Glasgow, 12-15 June 2017 (2017, June)

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See detailChallenges of Trace Mineral Diagnosis
Guyot, Hugues ULg

in ACVIM Forum Proceedings (2017, June)

Trace elements deficiencies are commonly seen in cattle herds in Europe and in some parts of the USA. Many reasons are involved: economics of the cattle industry, nutrients formulation and legislation ... [more ▼]

Trace elements deficiencies are commonly seen in cattle herds in Europe and in some parts of the USA. Many reasons are involved: economics of the cattle industry, nutrients formulation and legislation, depletion of soil and roughages quality. The clinical signs of the deficiencies are rarely pathognomonic but loss of production, impaired reproduction performances or increased morbidity/mortality rates are mostly observed. In a European critical economic context, especially for milk production, it is not easy to convince the farmer to invest in diagnosis and/or trace mineral supplementation. Nevertheless, it is important to investigate the nutritional status of the herd to improve global herd health. This presentation aims to present the interest of the diagnosis of trace mineral deficiencies as well as the different manners to investigate this nutrition trouble at a herd level. Trace mineral supplementation solutions will be briefly discussed. [less ▲]

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See detailHeritage mining landscapes as rural capital: the case of two heavy metals minings wastelands in Wallonia
Dubois, Charline ULg; Vanderheyden, Vincent ULg; Schmitz, Serge ULg

Poster (2017, June)

For a long time and due to the socio-economic trauma caused by the closure of the mines, the hazards of abandoned sites and soil pollution, the newness of vestiges, or the symbol of the failure of an ... [more ▼]

For a long time and due to the socio-economic trauma caused by the closure of the mines, the hazards of abandoned sites and soil pollution, the newness of vestiges, or the symbol of the failure of an industrial development model, on-field industrial remains were not considered as valuable heritage, particularly in rural spaces. Indeed, in the dominant imagery of rural areas, industry and countryside do not fit together (Cloke et al., 1996; Edelblutte & Legrand, 2012). Yet, such industrial activities have a long history in some areas such as in rural East-Belgium. The past deindustrialization resulted in wastelands on which stakeholders have nowadays various interests. Some of these industrial wastelands try to become places of heritage preservation and valorisation (Fagnoni, 2003; Kitchen et al., 2006; Roth, 2007; Mitchell & O’Neill, 2016). In this paper, we consider industrial wastelands with the aim to develop and enhance rural development and heritage landscapes. The mining wastelands are defined as abandoned areas where old traces of mining (e.g. factories and buildings, cuts and fills material, other marks in the landscapes, polluted soils) are still present. These areas are waiting for a new evaluation in order to create rural development strategies and local projects. We study how to preserve and protect these authentic high value landscapes and what can be proposed as type of rural strategy and rural landscape management. How to reallocate the space of wastelands according to the valorisation of cultural and natural heritage? Through qualitative document analysis and stakeholders interviews, we are discussing on the basis of two case studies concerning heavy metals mines in Easten Belgium within an hour’s drive from Liège. The first case is the “Haldes calaminaires” area in Plombières (former lead and zinc mine) and the second one is the “Rouge-Thier” area in Stoumont (former manganese mine), both industrial wastelands in rural area with a real potential for rural development in some touristic, recreational, scientific, and pedagogical frameworks (Rosengarten, 2008; Dussart & Dussart, 1991). Different scenarios are possible to allow both sites to be recognized, saved, protected, enhanced, and developed for tourists and inhabitants, but they must confront the divergent heritage, cultural, biological, urban and socio-economic interests and issues of local and regional actors. [less ▲]

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See detailNumerical simulations of a non-charring ablator in high enthalpy flows by means of a unified flow-material solver
Schrooyen, Pierre; Coheur, Joffrey ULg; Turchi, Alessandro et al

Conference (2017, June)

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See detailFATIGUE CRACK PROPAGATION IN HSS S690QL WELDED CONNECTIONS IN BRIDGES
Bouffioux, Chantal ULg; Canales Cardenas, Cristian ULg; Duchene, Laurent ULg et al

Conference (2017, June)

The fatigue and crack study of HSS S690QL steel welded pieces is first experimentally analyzed by fatigue tests on small samples of Base Material (BM), Heat Affected Zone (HAZ) and Weld Metal (WM ... [more ▼]

The fatigue and crack study of HSS S690QL steel welded pieces is first experimentally analyzed by fatigue tests on small samples of Base Material (BM), Heat Affected Zone (HAZ) and Weld Metal (WM) separately for several stress ratios, stress levels, on smooth and notched samples. The Lemaître-Chaboche fatigue model combined with the stress gradient method and the three sets of parameters are found to accurately describe the behavior of each material. Another experimental campaign with larger pieces (closer to the scale of the bridge connections) called "small scale samples", with/without welded stiffeners, with several geometries and with/without post-treatment has shown each effect separately: the scale and machining effects, residual stresses due to the welding, geometrical and post-treatments effects. Numerical simulations of these experiments are used to improve and validate the material data, with a study in real context and size. Then, the characterized fatigue damage model is coupled with the element deletion method to model the propagation of cracks along the welded samples and the numerical predictions are compared with experimental results in order to validate the approach. [less ▲]

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See detailHic Sunt NATs: Uncovering Address Translation with a Smart Traceroute
Zullo, Raffaele; Pescapé, Antonio; Edeline, Korian ULg et al

in IEEE/IFIP Workshop on Mobile Network Measurement (MNM) (2017, June)

Middleboxes are pervasive in today's Internet as they are deployed for an increasing number of reasons. An example is the network address translation (NAT), one of the first task to be performed to cope ... [more ▼]

Middleboxes are pervasive in today's Internet as they are deployed for an increasing number of reasons. An example is the network address translation (NAT), one of the first task to be performed to cope with the lack of IPv4 addresses. Recently the landscape for NATs has become even more crowded, especially in mobile networks, mainly due to the impossibility of IPv6 to be a large-scale solution to addressing issues. In this paper, we present a novel methodology for detecting NATs embodied in Mobile Tracebox, a measurement tool for Android smart devices that detects a wide range of middleboxes. It analyzes ICMP time-exceeded messages received during \traceroute and points at IP and transport checksum inconsistencies in the embedded packets to uncover address translation along a path. We deployed Mobile Tracebox through a crowdsourcing approach and used the collected dataset to validate our methodology. Results showed that, in absence of middleboxes breaking \traceroute, it can help to detect and locate NATs in the majority of the cases. [less ▲]

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See detailDiversity and biogeography of microorganisms in microbial mats of Antarctic lakes
Durieu, Benoit ULg; Lara, Yannick ULg; Obbels, Dagmar et al

in Van de Putte, Anton (Ed.) Book of abstracts: XIIth SCAR Biology Symposium, Leuven, Belgium, 10-14 July 2017. (2017, June)

The BelSPO project CCAMBIO aims to study the biogeographical distribution of microorganisms (bacteria, cyanobacteria, microeukaryotes) in lacustrine microbial mats using a combination of techniques ... [more ▼]

The BelSPO project CCAMBIO aims to study the biogeographical distribution of microorganisms (bacteria, cyanobacteria, microeukaryotes) in lacustrine microbial mats using a combination of techniques including microscopic observations, strain isolation and genetic characterisation, and molecular diversity assessments using Next Generation Sequencing of environmental DNA. The samples were collected in different Antarctic and sub-Antarctic biogeographical regions. [less ▲]

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See detailEmpathie et culpabilité : les émotions au coeur du lien social
Devillers, Bérengère ULg

in Actes des 17èmes journées de valorisation de la recherche « La place des émotions dans le travail socio-éducatif » (2017, June)

Bonjour à tous, et merci aux organisateurs de m’avoir invitée. C’est un plaisir pour moi d’être là aujourd’hui parmi vous. Je vais tout d’abord revenir sur la traduction du « Good Lives Model ». Plusieurs ... [more ▼]

Bonjour à tous, et merci aux organisateurs de m’avoir invitée. C’est un plaisir pour moi d’être là aujourd’hui parmi vous. Je vais tout d’abord revenir sur la traduction du « Good Lives Model ». Plusieurs traductions sont communément admises, les plus connues étant celles de « modèle de bonne vie » ou « modèle de vie satisfaisante » ou encore « modèle de vies saines ». Il faut savoir que le groupe Antigone, dans lequel je travaille, n’adhère pas vraiment à ces définitions. En effet, nous trouvons que les traductions françaises proposées enferment le sujet dans une vision prescriptive de ce que devraient être les besoins, qu’elles laissent entendre qu’il y aurait des besoins universels auxquels tous les individus devraient répondre. Or nous ne nous y retrouvons pas et cela ne correspond pas à l’intention de Ward qui veut faire référence à une manière de vivre qui est bénéfique pour le sujet lui-même. Je vous propose donc de garder l’appellation anglophone, « Good Lives Model ». Je vais revenir à l’émergence de ce modèle : il s’agit d’un modèle de réhabilitation qui a vu le jour au début des années 2000 sous l’impulsion de Tony Ward, tout d’abord pour le public des auteurs d’infractions à caractère sexuel. Cependant, il s’est rapidement étendu à d’autres populations, notamment les auteurs de violences domestiques, le public psychiatrique, et ce pour le public aussi bien adolescent qu’adulte. D’autres adaptations ont depuis vu le jour, notamment à l’initiative d’un service français, l’ARCA, qui est spécialisé en recherche et en intervention en délinquance sexuelle, et où le directeur, Erwan Dieu, a adapté le Good Lives Model au public radicalisé. Plusieurs expériences ont également été menées en Belgique, notamment une à l’hôpital des Marronniers, à Tournai, dans une unité de défense sociale qui accueille des délinquants sexuels. L’équipe a décidé, suite à une formation, de reprendre les outils du Good Lives Model et de les adapter avec les patients, afin qu’ils correspondent à leur langage, à leur niveau de compréhension et donc à leurs besoins. Le GLM se veut avant tout humaniste, positiviste et tout à fait écologiste, parce qu’il tient compte des différents systèmes qui gravitent autour de la personne. Il a pour première cible de traitement le développement des besoins humains fondamentaux. Sa deuxième cible est la réduction du risque de récidive, mais qui se veut être un effet de la poursuite du bien-être et des besoins des personnes. Le Good Lives Model comprend des principes théoriques et des implications cliniques. Selon un principe prioritaire au niveau théorique, nous considérons que le délinquant est animé par les mêmes besoins humains que tout un chacun, mais que les voies qu’il emprunte ne sont pas pro-sociales. Nous mettrons donc la notion de besoin au centre de la prise en charge, bien plus que le passage à l’acte délinquant. Le principe clinique qui me paraît être le plus en lien avec le thème qui nous occupe aujourd’hui est peut-être la notion de responsabilité à substituer à celle de culpabilité. Je ne connais pas précisément votre cadre légal protectionnel de la jeunesse. En Belgique, dans les mesures qui sont privilégiées par le magistrat de la jeunesse dès lors qu’un jeune a commis un fait qualifié d’infraction, nous retrouvons les mesures réparatrices, mais dans une visée de responsabilisation du jeune, de prise en compte des conséquences dommageables pour les victimes. Tel est le mandat qui est confié aux équipes chargées du suivi du jeune. Dans le cadre de la philosophie du modèle GLM, nous verrons s’opérer un glissement de la notion de responsabilité, qui reposait avant tout sur les épaules du jeune, vers celles de l’intervenant psychosocial et de son environnement proche : les familiers, mais aussi tous les intervenants gravitant autour du jeune. Par quoi cela passe-t-il concrètement ? Tout d’abord le GLM est attentif à la définition du problème. Bien souvent, le problème est libellé soit dans les rapports qui ont été rédigés par au sujet du jeune, soit dans l’ordonnance qui précise notamment la qualification des faits. Nous laisserons cela de côté, et nous repartirons avec le jeune de la définition du problème tel qu’elle se pose pour lui, dans l’ici et maintenant. Nous ne repartirons donc pas du passé, mais nous nous centrerons sur les conséquences pour lui et pour son environnement dans le présent, ce qui suppose que nous devrons nous accorder sur les buts et objectifs de la prise en charge. Le jeune et les intervenants seront donc associés aux différentes phases du plan de traitement, où les intervenants psychosociaux auront également une responsabilité. Par conséquent, ils s’engageront à réaliser des démarches avec le jeune. Par quoi passe encore cette responsabilité ? L’intervenant psychosocial devra créer les conditions propices à un engagement et à un maintien du jeune dans la prise en charge. La notion de disposition au traitement (Treatment Readiness, Ward et al., 2004) nous éclaire ici sur cette question de l’engagement tant de l’usager que de l’intervenant dans le processus de changement. En effet, la disposition au traitement est définie comme étant « la présence de caractéristiques (états et dispositions) dans le chef du délinquant mais aussi de la situation thérapeutique qui sont susceptibles de promouvoir l’engagement dans la thérapie et donc l’amélioration des aptitudes au changement thérapeutique » (Ward et al., 2004). Il existe également un langage assez particulier qui devra être adapté aux besoins et au niveau de développement du jeune. Tony Ward avait initialement énoncé onze besoins fondamentaux, et le GMAP, qui est le service en Nouvelle-Zélande ayant adapté le GLM pour les adolescents, a réduit le nombre de besoins à huit. Les besoins couvriront surtout la santé (émotionnelle, en général et sexuelle) ainsi que les besoins de réalisation, d’amusement, de trouver un sens à sa vie et de développer des relations. Nous travaillerons donc beaucoup tout ce qui est du registre des émotions, soit tout d’abord pouvoir identifier ses émotions avant de pouvoir les gérer. Dans les questions en lien avec le modèle de réhabilitation, il est vrai que nous travaillons le lien social. Or, dans l’optique GLM, nous ferons d’abord passer le lien social par un lien à restaurer du jeune vis-à-vis de lui-même. Dans l’optique GLM, nous considérerons que travailler le lien social et la réparation d’un dommage vis-à-vis de la société sans se soucier d’abord d’une réparation à l’encontre du jeune est anticipé, par rapport au fait de vouloir d’emblée se lancer dans une logique de réparation. Par conséquent, un accent est mis sur une alliance thérapeutique, et le jeune se sentira beaucoup plus concerné puisque nous partirons de sa définition à lui du problème, telle qu’elle se pose pour lui avant tout. Il pourra alors retrouver un sens, et quelque part, sortir un peu de cette stigmatisation, de cet étiquetage qui lui pèse et qui est souvent lié à tout son parcours, ou qui transparaît au travers des différents rapports, des diverses rencontres avec le magistrat ou les intervenants. Cette optique de travail pourra permettre également au jeune de sortir de ses mécanismes de défense, de faciliter une distanciation par rapport aux mécanismes habituels de minimisation, de déni, d’opposition, et nous verrons que les équipes ou les intervenants qui s’imprègnent de principes liés au GLM pourront s’inscrire davantage dans des rapports relationnels s’éloignant de rapports d’opposition, de recadrage (tels que souvent vécus par les équipes). Pour revenir sur l’expérience menée aux Marronniers, il a été constaté, dans les effets au premier plan, une amélioration de la qualité relationnelle avec les patients. Ceux-ci étaient tout à fait étonnés que l’équipe se détache du travail centré exclusivement sur les passages à l’acte, la récidive, les perspectives de réhabilitation, pour s’intéresser à leurs besoins. Le deuxième effet observé concerne le bien-être des travailleurs, qui s’est traduit par une réduction significative du taux d’absentéisme. L’équipe psycho-sociale ressentant en effet davantage de plaisir à travailler les forces plutôt que les déficits de leurs patients. Avec le jeune, nous travaillons aussi la question de la responsabilité active : toujours dans la notion d’ici et maintenant, que pourra engager le jeune, par exemple si un membre de la famille est toujours très préoccupé, s’il s’agit d’un abus intrafamilial, par la réalité du risque au quotidien ? Que peut dire le jeune de son rapport à la sexualité, mais vraiment dans l’ici et maintenant et dans des perspectives futures, dans ce qu’il peut mettre en place pour rassurer sa famille ? Nous travaillons donc le projet du jeune centré sur ses besoins et son avenir, et beaucoup moins le passé. Cela ne veut pas dire qu’il n’y a pas de place pour le travail sur l’empathie, sur les habilités relationnelles, personnelles et sociales, mais nous nous recentrons d’abord sur le jeune, sur les situations d’adversité qu’il a pu rencontrer durant sa trajectoire de vie afin de favoriser une expression libre de ses émotions. Comme nous l’avons vu avec notre collègue Nadine Lanctôt, bien souvent, nous pointons du doigt tous les éléments de victimisation, maltraitance sexuelle, négligence, mais nous oublions tout l’effet des violences plus émotionnelles, plus insidieuses, qui ont également des effets tout à fait délétères sur le développement du jeune. Ainsi, nous trouvons important de travailler toute cette reconnexion du jeune à ses différents états émotionnels, afin qu’il puisse distinguer le registre des idées, des émotions, des sensations physiologiques, pour ensuite pouvoir refaire ce travail vis-à-vis du passage à l’acte. Le GLM offre un cadre conceptuel et opérationnel utile aux professionnels pour intégrer une gamme d’évaluations et d’informations, de supports théoriques et d’outils d’intervention, dans la perspective d’une compréhension riche, cohérente et complémentaire des (et avec leurs) usagers. [less ▲]

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See detailE-CLOUD, the open microgrid in existing network infrastructure
Vangulick, David ULg; Cornélusse, Bertrand ULg; Vanherck, Thierry et al

in Proceedings of the 24th International Conference on Electricity Distribution (2017, June)

The main goal of the E-Cloud, as with every microgrid, is to maximize the consumption of energy produced locally. To reach this goal, based on consumption profiles of customers willing to participate in ... [more ▼]

The main goal of the E-Cloud, as with every microgrid, is to maximize the consumption of energy produced locally. To reach this goal, based on consumption profiles of customers willing to participate in the E-cloud and given some local restrictions (e.g. wind turbines cannot be put everywhere), an optimal mix of green generation sources (in kW) and local storage (in kWh) needs to be computed. Then according to this computation, the required generating units and storage device are installed. A repartition mechanism grants the customer a share of the generated electricity and storage capacity. These shares are either computed offline, or dynamically adapted on line. The project will test two models: either the DSO or a producer owns and operates the storage device. Two flows of information (real-time for operation of the storage facility and ex-post for its settlement) are needed to correctly manage the E-Cloud and to ensure correct information exchange with the wholesale market. These information flows are completed thanks to a forecast that provides members of the E-Cloud the full capability to anticipate and obtain the maximum benefits of the local generation. The expected benefits for the customer are a reduction of their electricity bill by a minimum of 10%. Societal benefits should also arise: 1) easing the technical integration of renewables’ generation embedded in the distribution network, and 2) avoids extra investment on the DSO network. The E-Cloud may also ensure new revenue for the DSO thanks to new services provided to the E-Cloud community. [less ▲]

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See detailProfiling inferior left dorsal premotor cortex: when Area 55b meets Premotor Eye-Field
Genon, Sarah ULg; Reid, Andrew; Langner, Robert et al

Poster (2017, June)

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See detailSafety update on dapagliflozin (DAPA) across the phase 2b/3 clinical trial program
Jabbour, Serge; Seufert, Jochen; SCHEEN, André ULg et al

Poster (2017, June)

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See detailImpact of an ultra-trail of 330 km on plasma levels
LE GOFF, Caroline ULg; Kaux, Jean-François ULg; Gergelé, Laurent et al

in Clinical Chemistry and laboratory medicine (2017, June)

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See detailSuperconducting weak links created by electromigration
Silhanek, Alejandro ULg

Conference (2017, June)

In this presentation, we explore in-situ controlled electromigration to fabricate superconducting weak links. We show evidence that in Al a transition from thermally assisted phase slips (TAPS) to quantum ... [more ▼]

In this presentation, we explore in-situ controlled electromigration to fabricate superconducting weak links. We show evidence that in Al a transition from thermally assisted phase slips (TAPS) to quantum phase slips may takes place when the effective cross section becomes smaller than ~150 nm2. In the regime dominated by quantum phase slips the nanowire loses completely its capacity to carry current without dissipation, even at the lowest possible temperature. We also discuss the origin of negative magnetoresistance at low magnetic fields in the bow-tie shaped constrictions. Strikingly, the detrimental effect caused by the repeated electromigration can be healed by simply inverting the current direction. These findings reveal perspectives of the proposed fabrication method for exploring various fascinating superconducting phenomena in atomic size constrictions. [less ▲]

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See detailThe BCCM/ULC collection to conserve the biodiversity and study the secondary metabolites of Antarctic cyanobacteria
Lara, Yannick ULg; Durieu, Benoit ULg; Renard, Marine et al

in Van de Putte, Anton (Ed.) Book of abstracts: XIIth SCAR Biology Symposium, Leuven, Belgium, 10-14 July 2017. (2017, June)

The BCCM/ULC public collection is funded by the Belgian Science Policy Office since 2011. A Quality Management System ensures that the services of deposits (both public and safe) and distribution are well ... [more ▼]

The BCCM/ULC public collection is funded by the Belgian Science Policy Office since 2011. A Quality Management System ensures that the services of deposits (both public and safe) and distribution are well documented and efficient for the clients’ satisfaction. It has obtained the ISO 9001 certification for deposition and distribution of strains, as part of the multi-site certification for the BCCM consortium. This collection aims to gather a representative portion of the Antarctic cyanobacterial diversity with different ecological origins (limnetic mats, soil crusts, cryoconites, endoliths…) and make it available for researchers to study the taxonomy, evolution, adaptations to harsh environmental conditions, pigments, and genomic make-up. It presently includes 216 cyanobacterial strains, of which 119 are of Antarctic origin (catalogue: http://bccm.belspo.be/catalogues/ulc-catalogue-search). In addition, cyanobacteria are known to produce a wide range of secondary metabolites (e.g. alkaloids, cyclic and linear peptides, polyketides) with bioactive potential. Genome sequencing of 11 strains has been started to enable genome mining for biosynthetic clusters. Pair-read data from illumina MiSeq runs were obtained and submitted to a bioinformatic pipeline dedicated to the assembly of genomes and search of sequences involved in the biosynthesis of secondary metabolites. Gene cluster prediction analysis allowed to characterize 20 clusters of NRPS, PKS and hybrid NRPS-PKS from 2 to 66kb. Surprisingly, none of the characterized operons had previously been described in the literature. [less ▲]

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See detailTowards a Renewed Alias Resolution with Space Search Reduction and IP Fingerprinting
Grailet, Jean-François ULg; Donnet, Benoît ULg

in Network Traffic Measurement and Analysis Conference (TMA) (2017, June)

Since the early 2000's, the Internet Topology has been frequently described and modeled from the perspective of routers. To this end, alias resolution mechanisms have been developed in order to aggregate ... [more ▼]

Since the early 2000's, the Internet Topology has been frequently described and modeled from the perspective of routers. To this end, alias resolution mechanisms have been developed in order to aggregate all IP interfaces of a router, collected with traceroute, into a single identifier. So far, many active measurement techniques have been considered, often taking advantage of specific features from network protocols. However, a lot of these methods have seen their efficiency decrease over time due to security reinforcements across the Internet. In this paper, we introduce a generic methodology to conduct efficient and scalable alias resolution. It combines the space search reduction of TreeNET (a tool for efficiently discovering subnets) with a fingerprinting process used to assess the feasibility of several state-of-the-art alias resolution methods, using a small, fixed amount of probes. We validate our method along MIDAR on an academic groundtruth and demonstrate that our methodology can achieve similar accuracy while using less probes and discovering subnets in the process. We further evaluate our method with measurements made on PlanetLab towards several distinct ASes of varying sizes and roles in the Internet. The collected data shows that some properties of our fingerprints correlate with each other, hinting some observed profiles could be linked with equipment vendors. Both TreeNET (which implements our methodology) and our dataset are freely available. [less ▲]

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See detailSeparation of FLEC diastereomers by CE vs. LC approaches in the context of neurometabolomics
Moldovan, Radu-Cristian ULg; Bodoki, Ede; Servais, Anne-Catherine ULg et al

Poster (2017, June)

Some of the D-amino acids (D-Ser, D-Asp, D-Glu) have gained an increasing attention during the last decades, due to the discovery of their role as neurotransmitters and their implication in different ... [more ▼]

Some of the D-amino acids (D-Ser, D-Asp, D-Glu) have gained an increasing attention during the last decades, due to the discovery of their role as neurotransmitters and their implication in different neurological pathologies (Alzheimer’s disease, schizophrenia etc.). Nevertheless, their use as biomarkers is particularly relevant when correlated with the levels of other neurotransmitters. In order to develop a fast and efficient separation method widely accessible for the quantitation of these molecules, we used only common separation tools such as RP-18 stationary phases for reversed phase liquid chromatography (RP-LC) or bare fused capillaries for capillary zone electrophoresis (CZE). For achieving chiral resolution, a derivatization procedure was implemented. (-)-FLEC was the chiral derivatization agent of choice due to its fast and quantitative reaction with primary and secondary amines and the ability of performing in-capillary derivatization. Moreover, the derivatization process implies only a simple mix of the sample and reagent, at room temperature. The separation of the FLEC derivatives of several biologically relevant D- and L- amino acids (Asp, Glu, Ser, Tyr, Trp, Phe, His) together with certain neurotransmitter molecules have been optimized using CZE or RP-LC, chiral resolution being achievable for all amino acids of interest. By the CZE approach the running buffer’s pH turned out to be critical in achieving baseline separation of the targeted analytes. The derivatives of most amino acids could be separated using 60mM acetate buffer at pH 5, while for Asp derivatives the separation could be achieved only at pH 4. Being stronger bases, a third run at a more alkaline pH was needed for the separation of the remainder neurotransmitters. Moreover, the implemented in-capillary derivatization allows a fast and fully automated separation procedure. As for the RP-LC approach 50 mM acetate buffer in combination with an organic modifier (methanol, acetonitrile or tetrahydrofuran (THF)) was tested as mobile phase using gradient elution. Once again, the strong influence of pH on the resolution was observed. The organic modifier nature was of critical importance, where only THF enabled baseline resolution for all amino acid derivatives. [less ▲]

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See detailEstablishment of reference values for 6 six steroids in serum
LE GOFF, Caroline ULg; Fabregat Cabello, Neus ULg; Huyghebaert, Loreen ULg et al

in Clinical Chemistry and Laboratory Medicine (2017, June)

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See detailCo-creating service recovery after service failure: The role of brand equity
Hazee, Simon ULg; Van Vaerenbergh, Yves; Armirotto, Vincent

Conference (2017, June)

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See detailLocal Control of AC/DC Converters for Frequency Support Between Asynchronous AC Areas
Papangelis, Lampros ULg; Debry, Marie-Sophie; Panciatici, Patrick et al

in IEEE PES 2017 PowerTech conference proceedings (2017, June)

This paper proposes a novel control scheme for frequency support among asynchronous AC areas through HVDC grids. It is based on local controllers, each acting on a voltage source converter, using locally ... [more ▼]

This paper proposes a novel control scheme for frequency support among asynchronous AC areas through HVDC grids. It is based on local controllers, each acting on a voltage source converter, using locally available measurements only, and supporting frequency of the adjacent AC area after a significant disturbance. The controller is combined with the existing DC voltage droop technique and is inspired of Model Predictive Control, taking into account various constraints. The coordination of the proposed control scheme with the existing secondary frequency control of an AC area is also discussed. Examples obtained from a test system with a five-terminal DC network connecting two asynchronous areas demonstrate the effectiveness of the proposed control scheme. [less ▲]

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See detailUntargeted serum metabolite profiling of colorectal cancer using GC-Orbitrap technology
Di Giovanni, Nicolas ULg; Cojocariu, C; Silcock, P et al

Poster (2017, June)

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See detailNew data on the Mesozoic radiation of chelonioids
Scavezzoni, Isaure ULg; Fischer, Valentin ULg

Poster (2017, June)

"Turtles" (Testudines) form a successful group of reptiles with several terrestrial, marine and fresh-water species. Their peculiar and somewhat constrained morphology (i. e. : carapace incorporating ribs ... [more ▼]

"Turtles" (Testudines) form a successful group of reptiles with several terrestrial, marine and fresh-water species. Their peculiar and somewhat constrained morphology (i. e. : carapace incorporating ribs, curved limbs, anapsid skull exempt of temporal fenestrae) and ecology has often obscured their relationships and, hence, their evolutionary history, notably in marine turtles (chelonioids). Modern chelonioids are divided in two clades (i. e. : shoft-shelled turtles and hard-shelled turtles) supported by distinct morphological and embryological characters. Their origin is traced back up to the Cretaceous, along with a series of extinct forms, many of which being collectively known as Protostegidae. Fossil evidence show that at least five clades of marine turtles were roaming the seas at the end of the Cretaceous. In fact, chelonioids appeared during the first stages of the Early Cretaceous and quickly exploded to reach a high level of disparity at the lowermost part of the late Cretaceous. Therefore, the Mesozoic radiation of chelonioids must have happened during the "middle" Cretaceous (especially the Aptian-Albian interval). However this radiation is poorly understood as the phylogenetic relationships of marine turtles are not resolved yet. Bringing new data may help resolve these issues, and it is the exact reason why the genus Rhinochelys is being investigated. [less ▲]

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See detailMicroplastics found in the stomach contents of Squalius cephalus from the Seine River
Collard, France ULg; Gilbert, Bernard ULg; Eppe, Gauthier ULg et al

Poster (2017, June)

Microplastics (plastics < 5 mm) are emerging pollutants of growing concern. Since the 2000s their abundance, degradation and impacts on wildlife are more and more studied and understood. However, few data ... [more ▼]

Microplastics (plastics < 5 mm) are emerging pollutants of growing concern. Since the 2000s their abundance, degradation and impacts on wildlife are more and more studied and understood. However, few data are available particularly in freshwater ecosystems. Some fish species have plastic in their stomach contents such as: Gobio gobio, Alburnus alburnus, Leuciscus leuciscus while other species have not. In controlled conditions, microplastics were found to cause negative impacts in fish: leaching of micropollutants, endocrine disruption, hatching inhibition and decrease of growth rate of larvae. The first step in the understanding of these impacts is the quantification and the characterisation of ingested plastics by organisms in the field. Plastics and other anthropogenic particles (textile fibres) were isolated from 40 stomachs of Squalius cephalus (the European chub) collected in the Seine River (Paris) in August 2016. One station is upstream and the three others are downstream of the Paris Megacity conurbation. This megacity exerts a great pressure on the Seine River. Plastics were isolated thanks to a method using sodium hypochlorite and all particles were then analysed by Raman spectroscopy. The method consists in a degradation overnight of the organic matter in the stomach contents by sodium hypochlorite. This mixture is then filtrated and particles longer than 5 µm are resuspended into an ethanol (99%) solution for centrifugation. The precipitate, containing all particles denser than ethanol, is collected (1.3 ml) and spread on a mount for Raman spectroscopy. Several lasers were used, depending on the particle’s colour. Spectra were recorded with an accumulation ranging from 5 to 50s. Preliminary results showed that 7 individuals out of 25 already analysed (28%) had ingested at least one anthropogenic particle (AP). Eight APs were found and characterized, the majority of them (7) being dyed fibres. One of these fibres was made of a plastic polymer, the polyethylene terephthalate. The others were made of an undetermined material as Raman analyses gave only information on the dye. The eighth particle was a fragment of polypropylene. It is the first time that fish are studied as a part of plastic pollution in the Seine River. All isolated particles have been analysed leading to precise results. The percentage of occurrence is in the common range of other studies while much lower than the European flounder coming from the River Thames and higher than fish coming from Geneva Lake. It is not surprising that the majority of APs were fibres as another study in the river Seine found that the fibres concentration in water is far greater than the fragments concentration, as well as in urban runoff. It is also possible that the retention time of fibres in the gut is longer than fragments. Toxicological impacts of fibre ingestion is still unknown despite their ubiquity in many freshwater environments. [less ▲]

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See detailComparison of cardiac biomarker fluctuation in runners of marathons, semi-marathons and untrained runners
LE GOFF, Caroline ULg; VRANKEN, Laura ULg; van Nueten, Jan et al

in Clinical Chemistry & Laboratory Medicine (2017, June)

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

Conference (2017, June)

Shallow reservoirs are often used in hydraulic engineering as sediment traps or storage basins. For short rectangular reservoirs, the main jet flows straight from the inlet to the outlet with on both sides ... [more ▼]

Shallow reservoirs are often used in hydraulic engineering as sediment traps or storage basins. For short rectangular reservoirs, the main jet flows straight from the inlet to the outlet with on both sides symmetric recirculation zones. In longer reservoirs, however, the main jet reattaches to the side of the reservoir leading to a small and a large recirculation zone. Previous studies have found an empirical geometric relation describing the switch between these two flow pattems. In this study, we demonstrate with a simple analytical model, that this switch in flow pattem coincides with a maximization of energy dissipation in the shear layer between the main jet and the recirculation zones. We show that for short reservoir lengths, energy dissipation is higher in the case of a symmetric fiow pattern, while for longer reservoir the energy dissipation is higher for asymmetric flow pattems. The simulated switch between the two flow patterns appears to be very close to the empirical relation. The strength of this approach lies in the fact that no detailed knowledge of small scale processes is needed, which may prove useful at an early stage of reservoir design. [less ▲]

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See detailLong-term monitoring of European eels in the Belgian Meuse River basin. From the historical drastic decline to recent outcomes of restocking practices.
Nzau Matondo, Billy ULg; Dierckx, Arnaud ULg; Benitez, Jean-Philippe ULg et al

Conference (2017, June)

Long-term monitoring of yellow- and glass eel stages were performed in upland areas (>300km from sea) in order (i) to quantify the decline of wild yellow eels entering in the Belgian Meuse from the ... [more ▼]

Long-term monitoring of yellow- and glass eel stages were performed in upland areas (>300km from sea) in order (i) to quantify the decline of wild yellow eels entering in the Belgian Meuse from the Netherlands; (ii) to follow their upstream individual colonization; and (iii) to analyze the adaptation of young eels stocked as glass eels imported from UK. By monitoring a fish pass from 1992 to 2016, we quantified that the number of ascending eels has declined from n=5613 in 1992 to n=21 in 2016 (3.99%/year) and the mean length of eels has increased (4.1mm/year). During 6-years, upstream individual colonization of eels (2010-2015, n=1371) was followed using fixed RFIDtracking system. Few eels continued to migrate 4 years after tagging (<0.3%) and at >20km upstream (3.7%); and velocity of eels varied between individuals (0.012- 3.1km/day). In a 4-year (2013-2016) monitoring study of restocked glass eels using electrofishing and mobile RFID-tracking campaigns, we observed that eels grew rapidly in upland small brooks and recruitment was better in rivers with high carrying capacity (>15.8%, 2years post-stocking). Restocked eels dispersed in up- and downstream directions with behaviors including sedentary, nomadic and intermediate lifestyles. This suggests stocking as potential management measure to enhance local eel stocks. [less ▲]

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See detailResilience of the DSO network near to 50.2Hz
Vangulick, David ULg; Ernst, Damien ULg; Van Cutsem, Thierry ULg

in Proceedings of the 24th International Conference on Electricity Distribution (2017, June)

In an electrical system where decentralized and embedded productions are becoming more and more important, it is essential to ensure there is a good understanding of their behaviour at their operating ... [more ▼]

In an electrical system where decentralized and embedded productions are becoming more and more important, it is essential to ensure there is a good understanding of their behaviour at their operating limits. One the most important operating limits is when the system frequency approaches 50.2 Hz. At this frequency, following the old requirements, many existing European PV inverters have to be disconnected. In such situations, we will demonstrate that the variance of the frequency measurement taken at every PV inverter plays a key role. It will be demonstrated that this variance is actually a good thing from the system’s point of view as it allows for a gradual disconnection, leading to a controlled variation of the frequency. [less ▲]

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See detailCoulombic driven multi-conformational aspects of oligorotaxane switches studied by ion mobility mass spectrometry and molecular dynamics
Hanozin, Emeline ULg; Mignolet, Benoît ULg; Morsa, Denis ULg et al

Conference (2017, June)

Introduction Artificial Molecular Machines (AMMs), such as Mechanically Interlocked Molecules (MIMs) and foldamers, have recently raised tremendous interest due to their unique properties. Under the ... [more ▼]

Introduction Artificial Molecular Machines (AMMs), such as Mechanically Interlocked Molecules (MIMs) and foldamers, have recently raised tremendous interest due to their unique properties. Under the influence of an appropriate stimuli (pH, redox potential, light…), such molecules are able to reversibly switch between distinct conformational states. Scientists may capitalize on such exclusive properties to get a better understanding of the biomacromolecular level or to design innovative “smart” materials. At the interface between foldamers and MIMs, oligorotaxanes exhibit a spring-like folded secondary structure with remarkable mechanical and physicochemical properties. In the present study, we use ion mobility coupled with mass spectrometry (IM-MS) to probe the conformational states of differentially charged oligorotaxanes in the gas phase. Method Oligorotaxanes are donor-acceptor polymers composed of a π electron-donating dumbbell over which a discrete number of π electron-accepting tetracationic cyclophanes are threaded. The numerous intra-molecular interactions provide them a highly-stabilized rigid rod-like structure in solution. We use IM-MS as implemented in the Synapt G2 HDMS (Waters, Manchester, UK) to investigate the structure of the ionized oligorotaxanes. Our purposes are to probe (i) the different populations of stable conformers generated according to the charge state z and (ii) the reversibility of an electron-driven or thermal-driven conformational change in the gas phase implemented via an electron transfer or collisional activation process prior to the mobility separation. Our experimental observations are supported by electronic structure optimizations at the PM6 and DFT levels coupled with Born-Oppenheimer Molecular Dynamics simulations. Preliminary data Our results highlight a progressive elongation of the oligorotaxane structure with increasing charge numbers until it reaches a maximum extension state. Matching the experimental data with theoretical simulations, we find that the oligorotaxanes adopt an entropically-favored globular shape at low z. As z increases, coulombic repulsions occurring between the cyclophanes gradually outweigh the stabilizing π-stacking interactions and force the structure to elongate. This process occurs in a multistep fashion, each corresponding to a distinct group of helical-shaped conformers, before it eventually results in a fully stretched structure. On the other hand, our results also highlight that a charge reduction driven by a non-dissociative electron transfer process leads to a refolding of the structure so that it adopts a size similar to its electrospray-generated counterpart when the appropriate number of electrons is added. This observation may be imparted to the gradual decrease of the Coulomb repulsions between the cyclophanes mediated through increasing numbers of transferred electrons. These results suggests that the transition from one conformer to another is reversible so that the electrostatic balance between the cyclophanes may be used to further tune the structural state adopted by this artificial molecular switch. The second stimulus relied on collisional activation whose inelastic component provides a way to build up energy into the accessible vibrational degrees of freedom. The conformational landscapes of such-activated oligorotaxanes ions were found unchanged in term of collision cross section position but the repartition of population was altered with a promotion of the most elongated conformer, provided the absence of selective fragmentation. Altogether, these results highlight the feasibility of handling the elongation state of oligorotaxanes in the gas phase through appropriate inputs and underline its conformational reversibility properties. Novel aspect Stimuli-induced reversible conformational rearrangements of innovative AMMs studied by IM-MS and molecular dynamics in the gas phase. [less ▲]

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See detailGelfand duality for compact pospaces
De Rudder, Laurent ULg

Conference (2017, June)

It is well known that the category of compact Hausdorff spaces is dually equivalent to the category of commutative C^\star-algebras. More generally, this duality can be seen as a part of a square of ... [more ▼]

It is well known that the category of compact Hausdorff spaces is dually equivalent to the category of commutative C^\star-algebras. More generally, this duality can be seen as a part of a square of dualities between compact Hausdorff spaces, C^\star-algebras, compact regular frames and de Vries algebras. Three of these dualities have been extended to dualities between compact pospaces, stably compact frames and proximity frames, the fourth part of the square being lacking. We propose the category of bounded Archimedean l-semi-algebra to complete what will be the outside square of dualities and to extend to category of C^\star-algebras. [less ▲]

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See detailStranger harassment: perception, tolerance and the influence of gender identities and gender stereotypes
Goblet, Margot ULg; Glowacz, Fabienne ULg

Poster (2017, May 31)

Stranger harassment is defined as gender based harassment in public spaces. Despite its frequency and its detrimental consequences, research has barely begun to address this phenomenon. Stranger ... [more ▼]

Stranger harassment is defined as gender based harassment in public spaces. Despite its frequency and its detrimental consequences, research has barely begun to address this phenomenon. Stranger harassment is in the eye of the beholder. Gender differences and contextual factors are decisive for its interpretation (Fairchild, 2010; Rotundo, Nguyen and Sackett, 2001). The aim of this study is to estimate contextual factors of stranger harassment and more precisely to examine the influence of gender identities and gender roles on perception and tolerance of stranger harassment within a population of young women and men aged 18-35. Two methods of data collection are used, a paper questionnaire and an on-line questionnaire. The sample should include more than 600 subjects. Participants are surveyed regarding their global life satisfaction (Satisfaction With Life Scale, Diener et al., 1985), personal experiences of stranger harassment (Sexual Experience Questionnaire, Fairchild, 2010) and the context of occurrence and the consequences of those experiences on several aspects of their life. Acceptation and tolerance of sexual harassment (Sexual Harassment Attitude Scale, Mazer et Percival, 1989), identification to gender roles (short French version of Bem Sex-Roles Inventory, Fontayne et al., 2000) and experiences of sexual victimization are also addressed. Results will provide us an overview of stranger harassment and its occurrence. Some risk factors may be identified, as experiences of sexual victimization that may influence tolerance of stranger harassment. Furthermore, the influence of gender roles and gender identities may be crucial for the understanding of stranger harassment as a gender based behavior [less ▲]

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See detailRecognition memory is associated with hippocampal volume in aging population: new evidence from brain imaging study
Narbutas, Justinas ULg; Blanpain, Manon ULg; Van Egroo, Maxime ULg et al

Poster (2017, May 31)

Introduction. The hippocampus is crucial for episodic memory, especially for recollection and pattern separation (i.e., the ability to store similar episodes as distinct memory traces). Episodic memory ... [more ▼]

Introduction. The hippocampus is crucial for episodic memory, especially for recollection and pattern separation (i.e., the ability to store similar episodes as distinct memory traces). Episodic memory declines with aging and this has been associated with hippocampal dysfunction. The main objective of our study was to explore how performance on a recognition memory task designed to assess pattern separation is associated with hippocampal volume in aging population. Method. Fourteen healthy late middle-aged participants (52-69 years-old) were evaluated on a Mnemonic Similarity Task (MST). In this task, participants study pictures and then have to discriminate between targets, similar lures, and unrelated foil objects. Recognition memory (RM) is assessed as the difference between hits and false alarms to unrelated foils, while pattern separation Bias metric (BPS) is the difference between the rate of ‘‘Similar’’ responses given to the lure items minus ‘‘Similar’’ responses given to the foils. Hippocampal volume was calculated using ASHS software, which uses T1-weighted and T2-weighted MRI to obtain optimal segmentation of hippocampal subfields. Results. Correlation analysis of preliminary data revealed that RM was significantly positively associated with the volume of the left subiculum and left perirhinal area 35. BPS was positively correlated with the volume of right CA2 region, but negatively associated with the volume of right CA3 region. Discussion. In a late middle-aged population, better visual recognition memory is associated with larger volume of the left subiculum and perirhinal area 35, two regions supporting representation of objects. [less ▲]

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See detailNarration et argumentation. Retour sur l’analyse du discours en sciences sociales
Lttr13; Badir, Sémir ULg; Polis, Stéphane ULg et al

Conference (2017, May 31)

En 1979 a paru un ouvrage dirigé par A.J. Greimas et É. Landowski, intitulé « Introduction à l’analyse du discours en sciences sociales ». L’ouvrage n’a pas connu le succès de son contemporain, publié la ... [more ▼]

En 1979 a paru un ouvrage dirigé par A.J. Greimas et É. Landowski, intitulé « Introduction à l’analyse du discours en sciences sociales ». L’ouvrage n’a pas connu le succès de son contemporain, publié la même année, le célèbre « Sémiotique. Dictionnaire de la théorie du langage ». On souhaite dans cette communication proposer un bilan critique, en comparant les postulats de la méthode sémiotique avec ceux d’autres modèles d’analyse, et soulever quelques questions théoriques relatives aux types de discours. L’ouvrage de Greimas et Landowski s’inscrit dans le projet général d’extension du modèle narratif d’analyse textuelle. Selon ce projet, le modèle initialement développé en vue de l’analyse des contes et des mythes peut être appliqué à différents types de discours en envisageant dans leur variété, suivant « un degré croissant de complexité et d’abstraction », les « formes de production sociale du sens » (Greimas & Landowski, p. 5, passim). Le modèle étend ainsi la notion de récit à tout type de discours, à toute forme textuelle, ainsi que le confirme le « Dictionnaire ». Cette extension généralisée prend appui sur une typologie des discours qu’illustrent des analyses particulières publiés dans les années 1980 (Bastide 1981 ; Bastide & Fabbri éds 1985 ; Landowski 1986). Déjà en 1966, dans « Sémantique structurale », Greimas prévoyait une typologie de quatre types de « micro-univers sémantiques » (p. 128) où s’opposent, en fonction de deux critères, les univers dits « idéologiques » (dont ressortit le conte populaire) et les univers « scientifiques ». On peut considérer que la proposition de recherche qu’ont dirigée Greimas et Landowski est ainsi située au point le plus éloigné d’élaboration et d’application initiale du modèle suivi et qu’elle constitue par conséquent une expérience-limite pour le modèle narratif. Ce faisant, l’approche sémiotique prenait le risque d’être confrontée à d’autres modèles d’analyse, tels qu’ils se sont élaborés dans des cadres théoriques issus de la rhétorique (réactualisée dans les années 1950 par Chaïm Perelman et son école), de la pragmatique (cf. Parret 1983 & 1987), de la sociologie de la connaissance (à partir de l’ouvrage fondateur de Berger & Luckmann 1966) ou comme ils relèvent d’autres courants théoriques en sciences du langage (notamment, en France, l’analyse du discours d’inspiration althussérienne). Pour l’analyse des discours en sciences sociales, ces modèles offrent deux avantages sur celui de la sémiotique : d’une part, il semble que les postulats théoriques sur lesquels ils sont construits s’accordent plus directement au type que ces discours constituent ; d’autre part, ils peuvent désormais compter sur une solide tradition d’études permettant de pérenniser les résultats. La congruence apparente entre modèles d’analyse et types de discours, malgré l’extension d’applicabilité à laquelle ces modèles peuvent prétendre, soulève des questions relatives à la légitimité d’une typologie des discours. Celle-ci peut-elle se mettre au-dessus des postulats théoriques qui forgent les appariements entre modèle d’analyse et type de discours ? Si ce n’est le cas, quels enjeux la question typologique permet-elle de soulever ? Outre celle de Greimas évoquée plus haut, les tentatives qui ont été proposées à ce sujet (notamment van Dijk 1972 & 1975 ; Adam 1999 & 2011 ; Bronckart 1997 ; Maingueneau 2007), nous permettront d’en donner au moins une idée. [less ▲]

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See detailÉvaluation des impacts des ouvrages transversaux sur le transport sédimentaire et l’hydromorphologie
Peeters, Alexandre ULg; Petit, François ULg; Houbrechts, Geoffrey ULg

Conference (2017, May 31)

Le transport naturel des sédiments de la charge de fond est aujourd'hui clairement identifié comme un contributeur essentiel pour atteindre le bon état écologique des cours d’eau (Directive 2000/60/CE ... [more ▼]

Le transport naturel des sédiments de la charge de fond est aujourd'hui clairement identifié comme un contributeur essentiel pour atteindre le bon état écologique des cours d’eau (Directive 2000/60/CE). Lorsque le transport sédimentaire est entravé par des obstacles, l’équilibre hydromorphologique et écologique de la rivière est alors perturbé. Ces obstacles à la continuité écologique sont nombreux dans le bassin versant du Bocq (233 km², affluent de la Meuse en Wallonie) : on en dénombre 76 sur les 135 km de linéaire de cours d'eau, ce qui représente 1 obstacle tous les 1,8 km en moyenne. Il s'agit principalement d'ouvrages transversaux liés à des usages anciens du cours d’eau (moulin, forge, abissage, pompe à eau, etc.). Dans le cadre du projet UE LIFE+ Walphy, des travaux de réhabilitation de la continuité écologique ont été réalisés entre 2009 et 2013 sur 22 ouvrages transversaux du bassin du Bocq. Avant la réalisation des travaux, plusieurs ouvrages ont fait l’objet d’un diagnostic hydromorphologique et sédimentaire, basé sur l'identification des zones impactées (remous liquide et solide) d'une part, et l'évaluation de l'effet de piégeage de l'ouvrage d'autre part. Ce dernier point repose sur la caractérisation de l'ouvrage et du remplissage de sa retenue, ainsi que sur des mesures granulométriques et des marquages de la charge de fond (transpondeurs passifs). Ainsi, nous avons mis en évidence différents cas de piégeage de la charge de fond : absent, partiel ou total. Parmi les travaux de réhabilitation de la continuité écologique, ce sont les projets de suppression d'obstacle qui sont les plus efficaces, comme l'illustre le cas du déversoir de Spontin, pour lequel nous avons quantifié les impacts de son arasement des points de vue hydromorphologique et sédimentaire. Enfin, l’aménagement d'une rampe rugueuse sur un site fortement artificialisé (lit bétonné) à contrainte importante (protection de captages d'eau potable) constitue un cas particulier de réhabilitation de la continuité écologique, pour lequel l'analyse approfondie du transport sédimentaire a fourni les éléments nécessaires au bon dimensionnement des matériaux à utiliser. [less ▲]

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See detailDo nonbelieved memories typically refer to childhood memories?
Vanootighem, Valentine ULg; Brédart, Serge ULg

Conference (2017, May 31)

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See detailFemmes auteures d’infraction à caractère sexuel en guidance sous contrainte judiciaire : entre représentations et réalités ?
Glowacz, Fabienne ULg; Lagneaux, Julien; MALEMPRE, Marc et al

Poster (2017, May 31)

La délinquance a été le plus souvent conjuguée au masculin alors que la violence des femmes est restée longtemps ignorée. Il en est de même pour la délinquance sexuelle agie par les femmes qui est étudiée ... [more ▼]

La délinquance a été le plus souvent conjuguée au masculin alors que la violence des femmes est restée longtemps ignorée. Il en est de même pour la délinquance sexuelle agie par les femmes qui est étudiée depuis peu et est reconnue tout en étant encore méconnue. Notre étude porte sur l’analyse de 23 dossiers émanant de 4 centres de santé mentale spécialisés en Belgique qui ont notamment pour mission de dresser des avis motivés à la demande d’autorité mandante dans le cadre d’un sursis probatoire, d’une libération probatoire ou définitive. L’analyse de contenu des dossiers a permis d’identifier les caractéristiques psychologique, sociale, sexuelle et criminologique des sujets ainsi que la nature des infractions commises et le profil de victimes. Dans la lignée des travaux en matière de délinquance non sexuelle, nous avons repris plusieurs questions dont celles du statut de la femme en tant que auteure et co-auteure, de la présence de troubles psychopathologiques, de l’usage de violences physiques, des antécédents judiciaires ainsi que des dynamiques familiales dans lesquelles elles ont évolué. Plus spécifiquement à la délinquance sexuelle, la sexualité et le rapport aux victimes et les victimisations antérieures ont été analysées pour compléter le portrait du fonctionnement de ces femmes. Les résultats de cette étude ont été confrontés aux représentations des travailleurs de ces centres recueillis à partir de Focus group. [less ▲]

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See detailNON-PATHOLOGICAL AGING OF THE EXECUTIVE FUNCTIONS: INFLUENCE OF THE VAL108/158MET NUCLEOTIDE POLYMORPHISM OF THE COMT GENE
Gilsoul, Jessica ULg; Manard, Marine ULg; Collette, Fabienne ULg

Conference (2017, May 31)

Introduction. According to the Dual-State Theory of prefrontal cortex dopamine, Val/Val polymorphism of the COMT gene would favor better flexibility abilities, whereas Met/Met carriers would favor better ... [more ▼]

Introduction. According to the Dual-State Theory of prefrontal cortex dopamine, Val/Val polymorphism of the COMT gene would favor better flexibility abilities, whereas Met/Met carriers would favor better stability abilities. These genotypic effects should be magnified in older people, as a decrease in cognitive resources increases the influence of individual genetic differences on cognitive performance. Therefore, the aim of the study is to investigate the influence of the COMT Val108/158Met nucleotide polymorphism on executive functions in normal aging. Method. We assessed the executive processes of inhibition, shifting, and updating thanks to many different tasks in groups of young (n = 55) and aged participants (n = 45) carrying one of the three polymorphisms of the COMT gene (Val/Val, Val/Met, Met/Met). T-tests between our two groups (Young versus Aged) but also a 6 (Group: Young-Met/Met, Young-Val/Met, Young-Val/Val, Old-Met/Met, Old-Val/Met, and Old-Val/Val) X 3 (Executive functioning: Inhibition, Shifting, and Updating) repeated measure ANOVA with Executive functioning as within-subject factor (p < .05) were carried out. Results. Young and old participants significantly differed on the three executive functions. The comparison of genotypic groups showed no significant differences in young or older participants respectively. Interestingly, the Old-Val/Val group showed a lower performance than the young one on inhibition tasks. Discussion. As expected, we found an age effect on all the executive functions. The significant difference between the Young-Val/Val and the Old-Val/Val groups on inhibition suggests an age-related decrease in abilities requiring a stability component in individuals possessing a less favoring genotype for this component. [less ▲]

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See detailLes limites de l’administration de la PCL - R à une population de sujets schizophrènes dans le contexte médico-légal
Englebert, Jérôme ULg; Matteucci, Marie; De Page, Louis et al

Poster (2017, May 31)

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See detailLe "Good Lives Model", un modèle novateur d'intervention au service des besoins de l'usager: Expérience d'adaptation au sein de l'hôpital psychiatrique sécurisé "Les Marronniers" à Tournai
Henrard, Noémie ULg; Devillers, Bérengère ULg; Oswald, Pierre et al

Conference (2017, May 31)

L’Hôpital Psychiatrique Sécurisé (H.P.S.) « Les Marronniers » de Tournai fut la première équipe francophone, en collaboration avec le Groupe Antigone, à avoir adapté le Good Lives Model (GLM) à une ... [more ▼]

L’Hôpital Psychiatrique Sécurisé (H.P.S.) « Les Marronniers » de Tournai fut la première équipe francophone, en collaboration avec le Groupe Antigone, à avoir adapté le Good Lives Model (GLM) à une population psychiatrique (GLM – FM). Le cadre théorique et méthodologique du G.L.M – FM offre la possibilité de dépasser le paradigme du risque/rechute en proposant des principes et outils qui guident l’intervention tout en tenant compte du rôle des symptômes psychiatriques/infraction et des besoins humains fondamentaux de l’usager. Le G.L.M – FM implique d’élaborer avec l’usager un « Good Live Plan », plan de vie visant à satisfaire les besoins humains fondamentaux et à accéder à une meilleure qualité de vie. Le G.L.M- FM intègre à la fois les risques et les perspectives de réadaptation, et ce, dans une approche globale, intégrée et cohérente. Objectifs : - Présenter les fondements théoriques et les principes cliniques de base qui guident le Good Lives Model - Forensic Mental Health ; - Présenter différents outils cliniques (général et spécifique) permettant l’opérationnalisation du GLM-FM ; - Développer l’expérimentation et l’adaptation du G.L.M. réalisé au sein de l’H.P.S. de Tournai au travers des projets UET et Epicéas. Méthodes d’apprentissage : - Expérimentation par les participants d’un des champs de l’outil de l’Inventaire des Souhaits et Préoccupations Personnels (ISPP) ; - Articulation des principes théoriques et cliniques ; [less ▲]

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See detailObservation and simulation of ethane at 22 FTIR sites
Mahieu, Emmanuel ULg; Franco, Bruno ULg; Pozzer, Andrea et al

Conference (2017, May 30)

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See detailLogical tools for descriptive psychology. Set theory and foundational mereology
Leclercq, Bruno ULg

Conference (2017, May 30)

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See detailImpact of circulation changes on the long-term trend of stratospheric hydrogen fluoride at five NDACC stations
Prignon, Maxime ULg; Bernath, P.F.; Blumenstock, T. et al

Poster (2017, May 29)

Hydrogen fluoride is mainly produced by the photolysis of anthropogenic source gases such as the chlorofluorocarbons (CFC), the hydrochlorofluorocarbons (HCFC) and the hydrofluorocarbons (HFC). These ... [more ▼]

Hydrogen fluoride is mainly produced by the photolysis of anthropogenic source gases such as the chlorofluorocarbons (CFC), the hydrochlorofluorocarbons (HCFC) and the hydrofluorocarbons (HFC). These families of species are known for contributing to ozone depletion and/or to the greenhouse effect. It is thus essential to regulate and monitor their emissions. Despite the fact that the Montreal protocol (1987) has succeeded to reduce and then suppress the CFC emissions, HF is still increasing in the stratosphere because of ongoing emissions of the HCFC and HFC substitution products. In the framework of the recent studies demonstrating the influence of stratospheric circulation changes on the trend of long-lived tracers (e.g. hydrogen chlorine), we decided to investigate the impact of these circulation changes on HF. To achieve this objective, the rates of changes over time of HF total/partial columns at various latitudes of the globe will be determined and critically discussed. Fourier Transform Infrared data produced at five NDACC sites (Kiruna – 68°N, Jungfraujoch – 46°N, Izana – 28°N, Lauder 45°S and Arrival-heights – 78°S) and satellite data (HALOE and ACE) will be used for this study. This preliminary selection of ground-based stations allows to cover both hemispheres and our period of investigation (last two decades). Finally, in order to support our data interpretation, two SLIMCAT simulations (standard and fixed dynamics) will also be included. [less ▲]

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See detailPhysiopathologie des tendinopathies
Kaux, Jean-François ULg

Conference (2017, May 28)

Le tendon, tissu conjonctif fibreux, mécaniquement responsable de la transmission de la force des muscles vers les os, constitue une entitédynamique qui, en fonction des contraintes, se restructure en ... [more ▼]

Le tendon, tissu conjonctif fibreux, mécaniquement responsable de la transmission de la force des muscles vers les os, constitue une entitédynamique qui, en fonction des contraintes, se restructure en permanence et, ce, grâce à diverses modifications métaboliques et mécaniques. Cetterevue décrit l’histologie, la vascularisation et l’innervation du tendon sain. De plus, la biomécanique et les réponses physiologiques tendineuses,ainsi que la physiopathologie de la tendinopathie y sont abordées. [less ▲]

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See detailActualités des traitements conservateurs des tendinopathies
Kaux, Jean-François ULg

Conference (2017, May 28)

Les connaissances et la prise en charge des tendinopathies ont beaucoup évolué depuis ces dernières années. En effet, se substituant désormais à l’ancienne appellation « tendinite », les tendinopathies ... [more ▼]

Les connaissances et la prise en charge des tendinopathies ont beaucoup évolué depuis ces dernières années. En effet, se substituant désormais à l’ancienne appellation « tendinite », les tendinopathies sont majoritairement décrites selon le modèle de continuum établi par Cook et Purdam. La compréhension de la physiopathologie de ces lésions a permis l’émergence de nombreux traitements dans le but d’obtenir une récupération optimale et une limitation des récidives. L’objectif de cet article est de faire une revue de l’actualité thérapeutique des tendinopathies. [less ▲]

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See detailPolyphosphoesters: new trends in synthesis and drug delivery applications
Jérôme, Christine ULg

Conference (2017, May 24)

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See detailCe que devait encore révéler le site de la Schola del Traiano à Ostia Antica
Morard, Thomas ULg

Conference (2017, May 24)

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See detailStreptomyces from Moonmilk, an Untapped Source of New Bioactive Compounds
Martinet, Loïc ULg; Maciejewska, Marta; Adam, Delphine ULg et al

Poster (2017, May 24)

Moonmilk speleothems of limestone caves host a rich microbiome, among which Actinobacteria represent one of the most abundant phyla. Ancient medical texts reported that moonmilk had therapeutical ... [more ▼]

Moonmilk speleothems of limestone caves host a rich microbiome, among which Actinobacteria represent one of the most abundant phyla. Ancient medical texts reported that moonmilk had therapeutical properties, thereby suggesting that its filamentous endemic actinobacterial population might be a source of natural products useful in human treatment. In this work, a screening approach was undertaken in order to isolate cultivable Actinobacteria from moonmilk of the Grotte des Collemboles in Belgium, to evaluate their taxonomic profile, and to assess their potential in biosynthesis of antimicrobials. Phylogenetic analysis revealed that all 78 isolates were exclusively affiliated to the genus Streptomyces and clustered into 31 distinct phylotypes displaying various pigmentation patterns and morphological features. Phylotype representatives were tested for antibacterial and antifungal activities and their genomes were mined for secondary metabolite biosynthetic genes coding for non-ribosomal peptide synthetases (NRPSs), and polyketide synthases (PKS). The moonmilk Streptomyces collection was found to display strong inhibitory activities against a wide range of reference organisms, as 94, 71, and 94% of the isolates inhibited or impaired the growth of Gram-positive, Gram-negative bacteria, and fungi, respectively. Interestingly, 90% of the cave strains induced strong growth suppression against the multi-drug resistant Rasamsonia argillacea, a causative agent of invasive mycosis in cystic fibrosis and chronic granulomatous diseases. We are currently identifying molecules responsible for the observed antimicrobial activities which, next to few known bioactive compounds, also reveals many active compounds with molecular masses that do not correspond to known antibiotic deposited in web biomolecules databases such as KNapSAcK, Pubchem, Chemspider. The challenge is to increase the production yields of these unknown compounds, and purify them to further characterize their structure by NMR. Overall, our work supports the common belief that moonmilk might effectively treat various infectious diseases thanks to the presence of a highly diverse population of prolific antimicrobial producing Streptomyces, and thus may indeed constitute a promising reservoir of potentially novel active natural compounds. [less ▲]

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See detailTime, preference and intensity: A contrastive study of rather (than) and eerder (dan)
Ghesquière, Lobke; Brems, Lieselotte ULg

Conference (2017, May 24)

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See detailMultifunctional poly(ionic liquid)s: from synthesis to applications in energy and environment
Detrembleur, Christophe ULg; Patil, Nagaraj ULg; Debuigne, Antoine ULg et al

Conference (2017, May 24)

Poly(ionic liquid)s (PILs) are a subclass of polyelectrolytes that gained an enabling role in many fields of polymer chemistry and material science. PILs combine the unique properties of ionic liquids ... [more ▼]

Poly(ionic liquid)s (PILs) are a subclass of polyelectrolytes that gained an enabling role in many fields of polymer chemistry and material science. PILs combine the unique properties of ionic liquids with the flexibility and properties of macromolecules, and provide novel attractive functions. Recently, the precision design of novel PILs by controlled/living polymerization (CLP) techniques was intensively searched for developing emerging applications. This talk will first discuss recent routes for the precision synthesis of all vinyl-imidazolium based (co)polymers in water or in organic media under non-demanding experimental conditions. We will then describe the preparation of innovative redox and surface active PILs, and show the potential of these PILs in battery applications and for multifunctional coatings. More specifically, we will show how macromolecular engineering can be exploited for designing innovative polymer cathodes for ultra-high performance Li storage with unprecedented performances (high capacities and ultra-long life-span over more than 3000 cycles at an extreme current-rate). This innovative and effective molecular design for polymer cathodes opens up new horizons in developing an economical and environmentally benign platform for large-scalable fabrication of high performance batteries. [less ▲]

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See detailPhenotyping of Brassica napus L. plantlets affected during in vitro growth by the presence of epoxiconazole.
Durenne, Bastien ULg; Blondel, Alodie; Ducat, Nathalie et al

in 7th International Symposium on Brassicas Abstract Book (2017, May 24)

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See detailTh17 cells impact on xenogeneic graft-versus-host disease
Delens, Loïc ULg; SERVAIS, Sophie ULg; Ehx, Grégory ULg et al

Poster (2017, May 24)

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See detailAn anticancer molecule stemming from a plant root produced in a bioreactor
Vassaux, Antoine; Tarayre, Cédric ULg; Delvigne, Frank ULg et al

Poster (2017, May 24)

Secondary metabolites produced by plants or their symbionts have already shown specific properties: anticancer, anti-inflammatory, antibacterial, antifungal effects, etc. Astin C is a non-ribosomal ... [more ▼]

Secondary metabolites produced by plants or their symbionts have already shown specific properties: anticancer, anti-inflammatory, antibacterial, antifungal effects, etc. Astin C is a non-ribosomal peptide (secondary metabolite) produced by the fungus Villosirosea asteris, endosymbiont of the medicinal plant Aster tataricus, which has shown an interesting anticancer activity. The current challenge is the production of the molecule on a large scale and in higher quantities, either from the original fungus through fermentation technologies, or by a heterologous yeast strain having integrated the genes involved in the astin C biosynthesis pathway. The purpose of this workshop is to highlight the implementation possibilities of a strain producing a metabolite of interest. [less ▲]

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See detailÉdition et étude de Gerard du Frattre, compilation épique du XVIe siècle
Lambert, Adélaïde ULg

Poster (2017, May 23)

Présentation du projet de thèse de doctorat.

Detailed reference viewed: 20 (2 ULg)
See detailDesign of polyphosphoester-based drug delivery systems by efficient thiol-ene reaction
Riva, Raphaël ULg; Vanslambrouck, Stéphanie; Ergül, Zeynep ULg et al

Poster (2017, May 23)

Thanks to their biocompatibility, biodegradability and their structure similar to natural biomacromolecules, polyphosphoesters (PPE) are appealing polymers for biomedical applications. In contrast to ... [more ▼]

Thanks to their biocompatibility, biodegradability and their structure similar to natural biomacromolecules, polyphosphoesters (PPE) are appealing polymers for biomedical applications. In contrast to polyesters, PPE properties and functionality are easily tuned via the chemical nature of the lateral chains. To enhance the drug loading capacity of PPE-based micelles used as carriers for the delivery of poorly soluble drugs, an efficient strategy to increase the lipophilicity of the PPE block of polyethylene oxide (PEO)-b-PPE amphiphilic copolymers has been investigated. A PEO-b-PPE copolymer bearing pendant vinyl groups along the PPE block was synthesized and then modified by thiol-ene click reaction with thiols bearing either a long linear alkyl chain (dodecyl) or a tocopherol moiety. Ketoconazole was used as model for hydrophobic drugs. Comparison of the loading contents and release profiles with PEO-b-PPE bearing shorter pendant groups is presented evidencing the key role of the structure of the pendant group on the PPE backbone. Finally, the low cytotoxicity of these novel PEO-b-PPE copolymers was also demonstrated. The tocopherol derivative was evidenced as particularly promising for drug delivery systems. [less ▲]

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See detailA surprising and dramatic neuroendocrine-immune phenotype of mice deficient in Growth Hormone-Releasing Hormone (GHRH)
Farhat, Khalil; Bodart, Gwennaëlle ULg; RENARD, Jeanne de Chantal ULg et al

Poster (2017, May 23)

In the framework of close interactions between the immune and neuroendocrine systems, Growth Hormone (GH) has been proposed to exert significant effects on the immune system, but there is not yet a ... [more ▼]

In the framework of close interactions between the immune and neuroendocrine systems, Growth Hormone (GH) has been proposed to exert significant effects on the immune system, but there is not yet a consensus about GH immunomodulatory properties. These studies investigated the immune and anti-infectious response of dwarf Ghrh-/- mice presenting a severe deficiency of the GHRH/GH/IGF-1 axis. In basal conditions, thymic parameters and T-cell responses of Ghrh-/- mice were not severely affected but a constant B-cell lymphopaenia was observed. Thus, we investigated vaccine and anti-infectious responses of Ghrh-/- mice toward Streptococcus pneumonia, a B-dependent pathogen, Ghrh-/- mice were unable to trigger production of specific IgM and IgG against serotype 1 pneumococcal polysaccharide (PPS) after vaccination with either native PPS (Pnx23) or protein-PPS conjugate (Prev-13) vaccines. These vaccines both include the serotype 1 (our S.pneumoniae strain) and provide an effective protection in mice. A short GH supplementation to Ghrh-/- mice (1 daily injection of 1 mg/kg GH for 4 weeks) restored IgM and IgG response to Pnx23 vaccine but not to Prev-13. This suggests that GH could exert distinct impacts upon spenic areas. Furthermore, after intranasal instillation of a non-lethal dose (defined by the full clearance by WT C57BL/6 mice after 24h) of serotype 1 S.pneumoniae, Ghrh-/- mice exhibited a dramatic susceptibility. This was proved by a marked time-dependent increase in pulmonary bacterial, a septicemia already 24h after infection and a survival limit of 72h. We also observed a dramatic decrease in lung B- and T-cell populations and an increase in proportion of inflammatory macrophages. By contrast, wild-type and heterozygote mice completely cleared S.pneumoniae infection after 24h. In conclusion, our data show without ambiguity that the somatotrope GHRH/GH/IGF-1 axis plays an important and unsuspected role in defense against S.Pneumoniae. [less ▲]

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See detailCorrection de questions à réponses ouvertes: le logiciel SQORE
Crahay, Vinciane ULg; Bonnet, Pierre ULg

Conference (2017, May 23)

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See detailStudy of VOCs in the interaction between Banana and Foc TR4
Berhal, Chadi ULg; De Clerck, Caroline ULg; LEVICEK, Carolina et al

Poster (2017, May 23)

Banana fruit (Musa sp.) ranks fourth in term of worldwide 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 term of worldwide production, and has economical and nutritional key values. The popular and most dominant variety of the dessert banana group is the Cavendish variety. Nowadays, the Cavendish is endangered by the newly emergent race of the Panama disease, caused by the fungal pathogen Fusarium oxysporum f.sp. cubense TR4 (Foc TR4). 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 processes, they were never documented as a way to manage this disease on Cavendish. Thus, the aim of this PhD thesis is to study the VOCs in the specific interaction Cavendish/Foc TR4, as a way to manage this threat. Based on the work previously done with other plants at Gembloux Agro-Bio Tech/University of Liège/Belgium, a protocol was optimized for the extraction of the banana plant’s VOCs. And in parallel, models of in-vitro and in-vivo inoculations are under development, in order to distinguish the root zone from the upper part of the plant in the study. The results of the first analysis showed that the majority of the Cavendish VOCs belongs to the terpenes group, as well as ketones and an organic ester. The identified key VOCs of the interaction will be subject to toxicity tests, in order to determine their effect on the development of the plant and the pathogen. The banana plant is a staple food for more than 400 Million people in the world, while this disease persists as a major threat for its production, and this original study could contribute to the fight against this threatening disease. [less ▲]

Detailed reference viewed: 29 (2 ULg)
See detailPrecision synthesis and characterization of novel functional polymers
Scholten, Philip ULg; Debuigne, Antoine ULg; Demarteau, Jérémy ULg et al

Poster (2017, May 23)

Among controlled radical polymerisation techniques, cobalt-mediated radical polymerisation (CMRP) has proven to be a valuable alternative in polymerising unreactive and unconjugated monomers of many ... [more ▼]

Among controlled radical polymerisation techniques, cobalt-mediated radical polymerisation (CMRP) has proven to be a valuable alternative in polymerising unreactive and unconjugated monomers of many different monomer classes under mild conditions, including α-olefins. In a reversible deactivation mechanism, a cobalt complex reversibly traps the active growing chains and converts them into dormant species, avoiding side reactions and allowing for a controlled polymerisation. A fine control over the architecture is possible and allows to synthesise a large diversity of unprecedented block and alternating copolymers. Furthermore, functionalisation of the α- and ω-chain ends is now also possible. In this poster, the polymerization of different vinyl monomers using CMRP has been investigated to design highly functional materials under mild experimental conditions. The copolymerisation behaviour of these novel monomers was examined, and the structure and thermal properties of the new copolymers were investigated. [less ▲]

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See detailEssential oil of Tunisian plant: biopesticide applied in agricultural system
Ben Kaab, Sofiène ULg; ksouri, riadh; Jijakli, Haissam ULg

Conference (2017, May 23)

The use of plant-derived products in postharvest disease management may be a valid alternative to conventional chemical treatments (Pane et al., 2016). Unfavorable environmental conditions (such as salt ... [more ▼]

The use of plant-derived products in postharvest disease management may be a valid alternative to conventional chemical treatments (Pane et al., 2016). Unfavorable environmental conditions (such as salt and drought) increase production and accumulation of reactive oxygen species (ROS). Consequently, Tunisian plants have developed adaptive responses including the synthesis of specific bioactive molecules used for medical and nutritional purposes (Ksouri et al., 2012). In that context, the main objective of the present study was the identification of essential oils from Tunisian plants against the important plant pathogens, particularly in Europe. The study began with the selection of endemic medicinal plant suspected to present antimicrobial properties. The essential oil was extracted by hydrodistillation using a Clevenger type apparatus (with a yield of 1.2%). The chemical composition of the essential oil obtained by hydro-distillation from the aerial parts was analyzed by GC/MS. Therefore, antifungal activity was evaluated against Fusarium culmorum, Fusarium oxysporum and Penicillium italicum, using ELISA microplates with a blocked randomized design, as described previously (Kouassi et al., 2012). In addition, the essential oil was then tested for their herbicidal activities in pre-emergence and post-emergence assays against three weeds species. The chromatographic analysis showed a complex mixture where twenty compounds were identified accounting for 98.75 % of the total oil. Monoterpenes was represented by 71.73 %. The dominant monoterpenes are α Pinene (7.09%), 1,8-Cineole (54.6%) and Camphor (12.27%). Essential oil reduced significantly spores germination in a dose-dependent manner. Their fungistatic activity reached 100% at 0.6% against Fusarium oxysporum . In the dose response bioassay, the essential oil reduced seed germination rate of Phalaris minor, Sylibum marianum and Trifolium incanatum. Seedling growth was measured by shoot and root lengths at day 7. At 0.5%, essential oil reduced 100% seed germination. Post-emergence bioassays consisted in spraying essential oil at 3 concentrations (0.75, 2 and 3.4 %) at 2 leaves stage of three weeds species. Pelargonic acid was used as commercial positive control at 3.4%. At 0.75% and 2%, the essential oil do not show any sign of injury. However, only at 3.4 %, the spraying of essential oil showed visible injury ranging from wilting (after 1 day) and chlorosis (after 3 day) on Trifolium incanatum and Phalaris minor. After formulation, to enhance the distribution, the coverage and the penetration of the active molecules, the essential oil presented a high herbicidal activity. In conclusion, this work allowed to open new perspectives on the application of Tunisian essential oil as Novel biocontrol strategies against damageable plant pathogens and weeds. [less ▲]

Detailed reference viewed: 38 (5 ULg)
See detailStudy of volatile organic compounds active against barley pathogens
De Clerck, Caroline ULg; Kaddes, Amine ULg; Fiers, Marie et al

Conference (2017, May 23)

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See detailUsing crop modelling to determine the meteorological conditions to be implemented in an Ecotron facility - Prerequisites to improve the experimental design?
Dumont, Benjamin ULg; Leemans, Vincent ULg; Garré, Sarah ULg et al

Poster (2017, May 23)

An Ecotron is a facility where ecosystems are confined in experimental chambers, allowing the simultaneous control of environmental conditions and the on-line monitoring of processes. Under the threats of ... [more ▼]

An Ecotron is a facility where ecosystems are confined in experimental chambers, allowing the simultaneous control of environmental conditions and the on-line monitoring of processes. Under the threats of climate change and the pressure of a world growing population, such facilities will be of major importance to study the relations between climate change and agro-ecosystems.As it can quickly become time- and money-consuming, conducting experiments in an Ecotron will force researchers to cautiously select the climate of interest to be generated. They will thus need reliable tools to help them support the decision making process.Here, we present an innovative methodology, supported by the use of crop model, to assist researchers in finding the climatic conditions under which crop services will be impacted.The meteorological datasets among which the choice can be done were generated by the ALARO-0 model (RMI, Belgium) for current and future climatic conditions. Runs were conducted for the historical period 1981-2010, and for two time frames - 2041-70 and 2071-2100 - under two emissions scenarios - RCP 4.5 and 8.5.A crop model (STICS, INRA, FR) was run over the entire database. Crop model outputs were synthesized for the main crop phenological phases, i.e. the juvenile, vegetative and reproductive phases. A particular emphasis was put on agronomical outputs (biomass and grain yield) and crop growth stresses (deficit and excess of water, thermal and nutrient stresses).Using these outputs as selection criteria, a novel multi-criteria approach was designed to retro-select the specific climatic conditions allowing to reach certain outcomes (e.g. yield target) while simultaneously exhibiting given thresholds of stresses for any considered crop stages. [less ▲]

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See detailPERFORMANCES D’UNE MINI POMPE À CHALEUR RÉVERSIBLE FONCTIONNANT SUR L’AIR EXTRAIT : ÉTUDE NUMERIQUE ET EXPERIMENTALE
Ransy, Frédéric ULg; Gendebien, Samuel ULg; Lemort, Vincent ULg

Poster (2017, May 22)

La majeure partie de la consommation d’énergie des immeubles à appartement dits « basse énergie » est liée à la production d’eau chaude sanitaire et aux pertes par ventilation. De plus, ces immeubles sont ... [more ▼]

La majeure partie de la consommation d’énergie des immeubles à appartement dits « basse énergie » est liée à la production d’eau chaude sanitaire et aux pertes par ventilation. De plus, ces immeubles sont soumis à un risque de surchauffe non négligeable en été. Afin de minimiser leur consommation d’énergie, les systèmes HVAC utilisés dans ces bâtiments se doivent d’être performants et multitâches. Dans cette optique, l’Université de Liège teste actuellement une mini-pompe à chaleur réversible sur air extrait. Cet article présente les résultats expérimentaux obtenus en laboratoire et démontre quelles sont les variables qui influencent les performances de cette machine. Un modèle polynomial est également proposé. [less ▲]

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See detailProtein encapsulation into nanostructured CaCO3 microparticles templated by PEO-b-polyphosphoester using a supercritical CO2 process
Ergül, Zeynep ULg; Debuigne, Antoine ULg; Calvignac, Brice et al

Poster (2017, May 22)

The use of calcium carbonate microparticles is becoming more and more attractive in biomedical applications as proteins carriers for their controlled delivery in the body. We investigate the protein ... [more ▼]

The use of calcium carbonate microparticles is becoming more and more attractive in biomedical applications as proteins carriers for their controlled delivery in the body. We investigate the protein encapsulation by in situ precipitation of CaCO3 particles prepared by a process based on supercritical CO2 and using a new type of degradable well-defined double hydrophilic block copolymer composed of poly(ethylene oxide) and polyphosphoester block with an affinity for calcium like poly(phosphotriester)s bearing pendent carboxylic acids on each repeating monomer unit which evidenced an efficient structure for templating the formation of CaCO3 leading to unprecedented small-sized particles. Lysozyme was chosen as a model for therapeutic protein for its availability and ease of detection. It was found that by this green process, loading into the CaCO3 microparticles with a diameter about 2 μm can be obtained as determined by scanning electron microscopy. A protein loading up to 6.5% active lysozyme was measured by a specific bioassay (Micrococcus lysodeikticus). By encapsulating fluorescent-labelled lysozyme (lysozyme-FITC), the confocal microscopy images confirmed its encapsulation and suggested a core–shell distribution of lysozyme into CaCO3. [less ▲]

Detailed reference viewed: 31 (1 ULg)
See detailMerging CO2 transformation and utilization with renewable bio-resources: a step forward to a double vision of sustainable chemistry
Grignard, Bruno ULg; Poussard, Loïc; Raquez, Jean-Marie et al

Conference (2017, May 22)

Valorizing waste CO2 as a cheap, inexhaustible and renewable C1 feedstock is an early stage technology with strong innovation potential that imposes itself as a strategic driver for developing future low ... [more ▼]

Valorizing waste CO2 as a cheap, inexhaustible and renewable C1 feedstock is an early stage technology with strong innovation potential that imposes itself as a strategic driver for developing future low carbon footprints materials. Beside its use as raw chemical, the “physical” valorization of CO2 in a series of industrial cost-efficient processes will also accelerate the development of a low carbon economy and support the elaboration of a global low carbon vision scheme. The synergistic and paradigm-transforming holistic project we propose perfectly illustrates these concepts by encompassing a “cradle” to “grave” vision, i.e. from the products conception from CO2 and bio-resources to their production and processing through sustainable processes compatible with existing industrial relevant infrastructures. It focuses on the elaboration of sustainable isocyanate-free polyurethane foams with promising thermal insulation properties. By its objectives, this study also proposes an ideal alternative to the conventional synthesis of PUs and a practical answer to the challenge the PU sector is facing due to changes in the REACH regulations limiting the use of isocyanates. The success of the project relies on 3 key steps involving: i) The synthesis of bio- and CO2-sourced cyclic carbonates monomers: Due to the low reactivity of CO2 versus epoxides, addition of catalysts is necessary. To overcome this limitation, we developed a new highly-efficient bicomponent homogeneous organocatalyst that showed unexpected activity for the fast (within a few minutes) and selective addition of CO2 onto model epoxides and epoxidized vegetable oil under solvent-free and mild experimental conditions at the multiKg scale. The use of this powerful dual organocatalyst was further extended to the first organocatalytic coupling of CO2 with less reactive oxetanes to produce hydroxyl telechelic oligocarbonate entering the synthesis of CO2-sourced conventional PUs. - The synthesis of sustainable bio- and CO2- sourced isocyanates-free polyurethanes (NIPU): Sustainable NIPUs were produced by step-growth polymerization between the so-produced bio- and CO2-sourced cyclic carbonates and biosourced amino-telechelic comonomers derived from linseed fatty acids according to a process compatible with existing industrial infrastructures (extrusion). - The foaming of NIPUs: Sustainable foams with thermal insulation were produced by the supercritical CO2 assisted foaming technology. Due to its solubility in polymers, CO2 can replace conventional flammable VOCs and ozone depletion physical blowing agents as hydro- or fluorocarbons exhibiting long atmospheric life-time and/or mean global warming potential 2800 higher than CO2. By finely choosing the CO2 impregnation and the foaming conditions, low density microcellular NIPU foams with a thermal conductivity as low as 0.050 Wm-1K-1 were produced. Our study shows that CO2 is not only sequestered in the material for long-term application, but is also valorized as a blowing agent in the production of sustainable thermally insulating NIPU foams. Such low carbon footprints materials will contribute to energy conservation and savings by reducing CO2 emissions. [less ▲]

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See detailDEVELOPPEMENT D’UN MODELE DE SYSTEME DE CLIMATISATION AUTOMOBILE MULTI-EVAPORATEURS
Gillet, Thomas ULg; Gendebien, Samuel ULg; Lemort, Vincent ULg et al

Conference (2017, May 22)

La modélisation numérique d’un climatiseur d’automobile multi-évaporateurs, composé de deux évaporateurs et d’un refroidisseur d’eau, a été réalisée à l’aide du logiciel LMS Imagine.Lab Amesim® 1D avec le ... [more ▼]

La modélisation numérique d’un climatiseur d’automobile multi-évaporateurs, composé de deux évaporateurs et d’un refroidisseur d’eau, a été réalisée à l’aide du logiciel LMS Imagine.Lab Amesim® 1D avec le fluide frigorigène R-134a. Un banc d’essai capable de reproduire les conditions extérieures d’un climatiseur automobile a été conçu afin de tester l’architecture de cette machine multi-évaporateurs avec le fluide frigorigène R-1234yf. Les bilans thermiques des premiers résultats expérimentaux sont analysés et présentés. Afin d’illustrer la complexité du contrôle d’une telle architecture en régime dynamique, l’activation d’une vanne électromagnétique dans la boucle batterie du banc d’essais est présentée. Enfin, une perturbation de type échelon a été générée dans le modèle numérique afin de vérifier si les phénomènes transitoires observés expérimentalement sont reproduits. [less ▲]

Detailed reference viewed: 77 (6 ULg)
See detailSynthesis of cross-linked P(HEMA) particles in supercritical carbon dioxide for protein delivery
Parilti, Rahmet ULg; Howdle, Steven M.; Jérôme, Christine ULg

Poster (2017, May 22)

This project aims to develop a novel one-pot strategy to obtain well-defined cross-linked particles able to carry peptides/proteins in their core, as along with targeting and/or imaging agents on their ... [more ▼]

This project aims to develop a novel one-pot strategy to obtain well-defined cross-linked particles able to carry peptides/proteins in their core, as along with targeting and/or imaging agents on their surface. In addition to this objective, polymerisations will be carried out in supercritical carbon dioxide (scCO2), which confers environmentally benign features to the process. Here, we investigate the feasibility of free radical dispersion polymerizations of 2-hydroxyethyl methacrylate (HEMA) in scCO2. In order to ensure the successful dispersion in scCO2 novel diblock CO2-philic surfactants are employed. These diblock surfactants are formed from two different segments, a CO2-phobic block which has an affinity to the growing particles and a second CO2-philic block that ensures surfactant solubility. [less ▲]

Detailed reference viewed: 35 (4 ULg)
See detailFunctional emulsion-templated porous polymers by macromolecular surfactant anchoring strategies
Mathieu, Kevin ULg; Jérôme, Christine ULg; Debuigne, Antoine ULg

Poster (2017, May 22)

Macroporous polymer monoliths with interconnected structures have attracted considerable interest in the fields of supported catalysis, chromatography, water purification, etc. A popular and ... [more ▼]

Macroporous polymer monoliths with interconnected structures have attracted considerable interest in the fields of supported catalysis, chromatography, water purification, etc. A popular and straightforward synthesis approach for such open-cell polymers is based on the polymerization of high internal phase emulsion (HIPE). Advanced functional polyHIPEs were also produced via different post-modification strategies but the latter often consists in tedious multi-step processes. This communication aims at reporting an efficient one-pot macromolecular surfactant-assisted method for the simultaneous synthesis and chemical functionalization of macroporous polyHIPEs. Briefly, amphiphilic block copolymers prepared by nitroxide-mediated radical polymerization (NMP) or reversible addition-fragmentation chain transfer (RAFT) were used as HIPE stabilizers and grafted at the surface of the walls of polyHIPE during the polymerization process. The impact of the controlled radical polymerization mechanism on the porous structure, openness and functionalization of the monoliths will be discussed. This strategy was also implemented with alkyne-terminated copolymers in order to decorate the surface of the polyHIPE’s cavities with “clickable” moieties which broadens the scope of functional macroporous polymers. [less ▲]

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See detailLaccase detoxification of lignocellulose hydrolysate
Cornet, Iris; Soti, Valentin; Richel, Aurore ULg et al

Poster (2017, May 22)

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See detailPerineuronal nets and song learning-related neuroplasticity in the songbird brain
Cornez, Gilles ULg; Jonckers, Elisabeth; Schevchouk, Olesya et al

Conference (2017, May 22)

Perineuronal nets (PNN) are aggregations of extracellular matrix components surrounding the soma of some neurons, mainly GABAergic interneurons expressing the calcium binding protein parvalbumin (PV+). In ... [more ▼]

Perineuronal nets (PNN) are aggregations of extracellular matrix components surrounding the soma of some neurons, mainly GABAergic interneurons expressing the calcium binding protein parvalbumin (PV+). In mammals, the development of PNN limits synaptogenesis around PV+ neurons and PNN have been validated as a marker characterizing the end of critical periods for visual learning. In songbirds, song learning is limited to critical periods during ontogeny in close-ended learners such as zebra finches and to specific phases of the annual cycle in open-ended learners such as canaries that are able to modify their song seasonally. Sensitive periods for song learning are associated with neuroplasticity including morphological changes due to neurogenesis and synaptic reorganization in the song control nuclei during development and adult seasonal song modifications. The hormonal control of developmental and seasonal neuroplasticity is well documented in songbirds but little is known about the possible regulation of sensitive periods for vocal learning by PNN. First, to explore the expression of PNN throughout the development, we used zebra finches brains collected at different key ages in the song learning process (10, 20, 30, 40, 50, 60, 90, 120 days post-hatch, dph) and we quantified PNN expression and their colocalization around PV+ interneurons. The number of PNN and the % of PNN around PV+ interneurons increased progressively during developmental song learning in 3 of the main song control nuclei (HVC, RA and Area X). Moreover, we confirmed that females that never sing have fewer PNN than males in HVC and RA, two song nuclei involved in song production, at all ages after the peak in PNN numbers seen in males between 50 and 90 dph. Secondly we used adult male and female canaries (in 2 different experiments) treated with a subcutaneous implant filled with testosterone or left empty in control subjects to mimic what happens in the spring when the seasonal modification of the song ends and the song crystallizes. Testosterone significantly increased the number of PNN in the main song control nuclei in both sexes. Together these data suggest that increased expression of PNN in the songbird brain might limit neuroplasticity at the end of developmental and seasonal vocal learning [less ▲]

Detailed reference viewed: 36 (2 ULg)