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See detailTowards an Australian Philosophy: Constructive Appropriation of Enlightenment Thinking in Murray Bail's The Pages
Herbillon, Marie ULg

in Tunca, Daria; Wilson, Janet (Eds.) Postcolonial Gateways and Walls: Under Construction (2017)

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See detailIntegrating production scheduling and vehicle routing decisions at the operational decision level: A review and discussion
Moons, Stef; Ramaekers, Katrien; Caris, An et al

in Computers & Industrial Engineering (2017), 104

Production scheduling and vehicle routing are two well-studied problems in literature. Although these supply chain functions are interrelated, they are often solved sequentially. This uncoordinated ... [more ▼]

Production scheduling and vehicle routing are two well-studied problems in literature. Although these supply chain functions are interrelated, they are often solved sequentially. This uncoordinated approach can lead to suboptimal solutions. In the current competitive business environment, companies are searching for methods to save costs and improve their service level. Integrating production and distribution scheduling operations can be an approach to improve the overall performance. This paper focuses on integrated production-distribution operational level scheduling problems, which explicitly take into account vehicle routing decisions of the delivery process. Existing literature on integrated production scheduling and vehicle routing problems is reviewed and classified. Both the problem characteristics of mathematical models and the accompanying solution approaches are discussed to identify directions for further research. [less ▲]

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See detailIntegration of order picking and vehicle routing in a B2C e-commerce context
Moons, Stef; Ramaekers, Katrien; Caris, An et al

in Flexible Services and Manufacturing Journal (2017)

E-commerce sales are increasing every year and customers who buy goods on the Internet have high service level expectations. In order to meet these expectations, a company’s logistics operations need to ... [more ▼]

E-commerce sales are increasing every year and customers who buy goods on the Internet have high service level expectations. In order to meet these expectations, a company’s logistics operations need to be performed carefully. Optimizing only internal warehouse processes will often lead to suboptimal solutions. The interrelationship between the order picking process and the delivery process should not be ignored. Therefore, in this study, an order picking problem and a vehicle routing problem with time windows and release dates are solved simultaneously using a single optimization framework. To the best of our knowledge, it is the first time that an order picking problem and a vehicle routing problem are integrated. A mixed integer linear programming formulation for this integrated order picking-vehicle routing problem (OP-VRP) is provided. The integrated OPVRP is solved for small instances and the results are compared to these of an uncoordinated approach. Computational experiments show that integration can lead to cost savings of 14% on average. Furthermore, higher service levels can be offered by allowing customers to request their orders later and still get delivered within the same time windows. [less ▲]

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See detailThe proteolytic system of pineapple stems revisited: Purification and characterization of multiple catalytically active forms.
Matagne, André ULg; Bolle, Laetitia; El Mahyaoui, Rachida et al

in Phytochemistry (2017), (138), 29-51

Crude pineapple proteases extract (aka stem bromelain; EC 3.4.22.4) is an important proteolytic mixture that contains enzymes belonging to the cysteine proteases of the papain family. Numerous studies ... [more ▼]

Crude pineapple proteases extract (aka stem bromelain; EC 3.4.22.4) is an important proteolytic mixture that contains enzymes belonging to the cysteine proteases of the papain family. Numerous studies have been reported aiming at the fractionation and characterization of the many molecular species present in the extract, but more efforts are still required to obtain sufficient quantities of the various purified protease forms for detailed physicochemical, enzymatic and structural characterization. In this work, we describe an efficient strategy towards the purification of at least eight enzymatic forms. Thus, following rapid fractionation on a SP-Sepharose FF column, two sub-populations with proteolytic activity were obtained: the unbound (termed acidic) and bound (termed basic) bromelain fractions. Following reversible modification with monomethoxypolyethylene glycol (mPEG), both fractions were further separated on Q-Sepharose FF and SP-Sepharose FF, respectively. This procedure yielded highly purified molecular species, all titrating ca. 1 mol of thiol group per mole of enzyme, with distinct biochemical properties. N-terminal sequencing allowed identifying at least eight forms with proteolytic activity. The basic fraction contained previously identified species, i.e. basic bromelain forms 1 and 2, ananain forms 1 and 2, and comosain (MEROPS identifier: C01.027). Furthermore, a new proteolytic species, showing similarities with basic bomelain forms 1 and 2, was discovered and termed bromelain form 3. The two remaining species were found in the acidic bromelain fraction and were arbitrarily named acidic bromelain forms 1 and 2. Both, acidic bromelain forms 1, 2 and basic bromelain forms 1, 2 and 3 are glycosylated, while ananain forms 1 and 2, and comosain are not. The eight protease forms display different amidase activities against the various substrates tested, namely small synthetic chromogenic compounds (DL-BAPNA and Boc-Ala-Ala-Gly-pNA), fluorogenic compounds (like Boc-Gln-Ala-Arg-AMC, Z-Arg-Arg-AMC and Z-Phe-Arg-AMC), and proteins (azocasein and azoalbumin), suggesting a specific organization of their catalytic residues. All forms are completely inhibited by specific cysteine and cysteine/serine protease inhibitors, but not by specific serine and aspartic protease inhibitors, with the sole exception of pepstatin A that significantly affects acidic bromelain forms 1 and 2. For all eight protease forms, inhibition is also observed with 1,10-phenanthrolin, a metalloprotease inhibitor. Metal ions (i.e. Mn2+, Mg2+ and Ca2+) showed various effects depending on the protease under consideration, but all of them are totally inhibited in the presence of Zn2+. Mass spectrometry analyses revealed that all forms have a molecular mass of ca. 24 kDa, which is characteristic of enzymes belonging to the papain-like proteases family. Far-UV CD spectra analysis further supported this analysis. Interestingly, secondary structure calculation proves to be highly reproducible for all cysteine proteases of the papain family tested so far (this work; see also Azarkan et al., 2011; Baeyens-Volant et al., 2015) and thus can be used as a test for rapid identification of the classical papain fold. [less ▲]

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See detailUsing a Structural Root System Model to Evaluate and Improve the Accuracy of Root Image Analysis Pipelines
Lobet, Guillaume; Koevoets, Iko; Noll, Manuel ULg et al

in Frontiers in Plant Science (2017), 8

Root system analysis is a complex task, often performed with fully automated image analysis pipelines. However, the outcome is rarely verified by ground-truth data, which might lead to underestimated ... [more ▼]

Root system analysis is a complex task, often performed with fully automated image analysis pipelines. However, the outcome is rarely verified by ground-truth data, which might lead to underestimated biases. We have used a root model, ArchiSimple, to create a large and diverse library of ground-truth root system images (10,000). For each image, three levels of noise were created. This library was used to evaluate the accuracy and usefulness of several image descriptors classically used in root image analysis softwares. Our analysis highlighted that the accuracy of the different traits is strongly dependent on the quality of the images and the type, size and complexity of the root systems analysed. Our study also demonstrated that machine learning algorithms can be trained on a synthetic library to improve the estimation of several root system traits. Overall, our analysis is a call to caution when using automatic root image analysis tools. If a thorough calibration is not performed on the dataset of interest, unexpected errors might arise, especially for large and complex root images. To facilitate such calibration, both the image library and the different codes used in the study have been made available to the community. [less ▲]

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See detailLabyrinthe-Fétiches, une exposition conçue par Toma Muteba Luntumbue à partir des collections africaines de l'Université de Liège
Bawin, Julie ULg

Book published by Cité Miroir (2017)

Comment exposer des objets que la colonisation a arrachés à un continent pour les faire parvenir en Europe où ils furent tour à tour considérés comme des curiosités, des vestiges d’une civilisation ... [more ▼]

Comment exposer des objets que la colonisation a arrachés à un continent pour les faire parvenir en Europe où ils furent tour à tour considérés comme des curiosités, des vestiges d’une civilisation sauvage et archaïque, des témoins de l’enfance de l’humanité, avant d’appartenir aux catégories de l’ « art nègre », des « arts primitifs » et, plus récemment, des « arts premiers » ? Les logiques évolutionnistes et différentialistes qui ont dicté les choix muséographiques des musées d’histoire naturelle et des premiers musées d’ethnographie ont-elles réellement disparu ? Le regard sur l’autre a-t-il changé, y compris dans les musées qui, sous l’impulsion du primitivisme, ont contribué à la reconnaissance des arts de l’Afrique ? Ces questions, qui portent sur l’ évolution du regard porté sur les objets africains et leur représentation depuis le XIXe siècle jusqu’à l’ époque post-coloniale, forment le point de départ de l’exposition Labyrinthe-Fétiches. Conçue par l’artiste Toma Muteba Luntumbue à partir des collections africaines de l’Université de Liège, cette exposition nous invite à déambuler dans le labyrinthe des idées et des préjugés qui ont inspiré la collecte, l’étude, la muséalisation, puis la sacralisation d’objets désormais enfermés dans une « prison de sens ». En reconstitant, dans l’espace de la Cité Miroir, les différents modes de classement et dispositifs de présentation des objets africains, Toma Muteba Luntumbue entend montrer combien leur présence muséale et leur artification les a définitivement privés de leur identité culturelle et de leur appartenance structurelle initiale. Ce phénomène de patrimonialisation a non seulement changé le sens et le statut de ces objets, mais il en a fait de nouveaux fétiches. Ce terme, utilisé dès le XVIe siècle pour qualifier des artefacts cultuels rapportés d’Afrique et repris à l’époque coloniale pour désigner avec dédain la statuaire africaine, revit aujourd’hui à travers la dimension iconique et sacrée que l’on attribue à ce que l’on nomme, à tort, le « patrimoine africain ». Devenus intouchables, alors qu’ils sont parvenus à nous dans une situation d’arrachement, de violence et de mépris, les objets d’art africain sont à présent figés dans une autre histoire typiquement occidentale, celle du « patrimoine mondial de l’humanité ». [less ▲]

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See detailL'exposition comme lieu d'activisme. Une conversation avec Toma Muteba Luntumbue
Bawin, Julie ULg; Muteba Luntumbue, Toma

in Labyrinthe-Fétiches. Une exposition conçue par Toma Muteba Luntumbue à partir des collections africaines de l'Université de Liège (2017)

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See detailCarte blanche pour exposer une collection ethnographique. Le parti pris d'un artiste-historien
Bawin, Julie ULg

in Bawin, Julie (Ed.) Labyrinthe-Fétiches. Une exposition conçue par Toma Muteba Luntumbue à partir des collections africaines de l'Université de Liège (2017)

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See detailChitosan : a promising polymer for cartilage repair and viscosupplementation
Comblain, Fanny ULg; Rocasalbas, Guillem; Gautier, Sandrine et al

in Bio-medical Materials & Engineering (2017)

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See detailStudies of HVC Plasticity in Adult Canaries Reveal Social Effects and Sex Differences as Well as Limitations of Multiple Markers Available to Assess Adult Neurogenesis.
Shevchouk, Olesya ULg; Ball, G.F.; Cornil, Charlotte ULg et al

in PLoS ONE (2017), 12(1), 0170938

In songbirds, neurogenesis in the song control nucleus HVC is sensitive to the hormonal and social environment but the dynamics of this process is difficult to assess with a single exogenous marker of new ... [more ▼]

In songbirds, neurogenesis in the song control nucleus HVC is sensitive to the hormonal and social environment but the dynamics of this process is difficult to assess with a single exogenous marker of new neurons. We simultaneously used three independent markers to investigate HVC neurogenesis in male and female canaries. Males were castrated, implanted with testosterone and housed either alone (M), with a female (M-F) or with another male (M-M) while females were implanted with 17β- estradiol and housed with a male (F-M). All subjects received injections of the two thymidine analogues, BrdU and of EdU, respectively 21 and 10 days before brain collection. Cells containing BrdU or EdU or expressing doublecortin (DCX), which labels newborn neurons, were quantified. Social context and sex differentially affected total BrdU+, EdU+, BrdU+EdU- and DCX+ populations. M-M males had a higher density of BrdU+ cells in the ventricular zone adjacent to HVC and of EdU+ in HVC than M-F males. M birds had a higher ratio of BrdU+EdU- to EdU+ cells than M-F subjects suggesting higher survival of newer neurons in the former group. Total number of HVC DCX+ cells was lower in M-F than in M-M males. Sex differences were also dependent of the type of marker used. Several technical limitations associated with the use of these multiple markers were also identified. These results indicate that proliferation, recruitment and survival of new neurons can be independently affected by environmental conditions and effects can only be fully discerned through the use of multiple neurogenesis markers. [less ▲]

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See detailLes Partenariats Public-Privé : fondement théorique et analyse économique
Maatala, Nassreddine ULg; Benabdellah, Majid; Lebailly, Philippe ULg

in Revue Marocaine des Sciences Agronomiques et Vétérinaires (2017), 5(2 (Mai 2017)),

The Public-Private Partnership (PPP) is globally recognized as a common style of management, especially in the following sectors: transportation, public services and community facilities. The interests of ... [more ▼]

The Public-Private Partnership (PPP) is globally recognized as a common style of management, especially in the following sectors: transportation, public services and community facilities. The interests of this partnership approach reside in the off-budget financing for the public partner, in the private partners’ high rate of return, in the reduced completion deadlines of the projects, and finally in the availability and quality of the public service provided. The economic theory sees in PPPs many advantages and disadvantages related not only to the partnership, but also to the nature of the public-private relationship that is considered as a particular relationship. In this article, we analyze in the first part the main theoretical foundations in which the Public Private Partnership (PPP) is inserted, then, we present the assumptions and the principles of each theory. In the second part, we present an economic analysis of this partnership approach while going through its advantages, disadvantages, and potential paths to address its limitations. [less ▲]

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See detailPolicy Dialogue Makes It Happen!
Porignon, Denis ULg

Conference (2017)

This presentation synthesizes positive achievements made in the frame of the EU-Luxembourg / WHO Universal Health Coverage Partnership over the last 5 years (2012-2016). It presents activities conducted ... [more ▼]

This presentation synthesizes positive achievements made in the frame of the EU-Luxembourg / WHO Universal Health Coverage Partnership over the last 5 years (2012-2016). It presents activities conducted by the several hundreds of persons who were involved in the field work, as well as in Regional Offices and WHO HQ. Please see details on www.uhcpartnership.net [less ▲]

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See detailLe krump : interactions, ressources sociales et personnelles et prévention sociale 
Collin, Jonathan ULg

Conference given outside the academic context (2017)

The conference addresses three main issues: the specific interactions that krumping creates among krumpers, the social and individual resources that it provides krumpers with and a reflection on krumping ... [more ▼]

The conference addresses three main issues: the specific interactions that krumping creates among krumpers, the social and individual resources that it provides krumpers with and a reflection on krumping as a tool for crime prevention. [less ▲]

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See detailLes « cavaliers budgétaires » sont-ils éphémères ? Une controverse qui perdure (note sous C.C., arrêt n° 58/2016 du 28 avril 2016)
Miny, Xavier ULg

in Revue de Jurisprudence de Liège, Mons et Bruxelles (2017), (3), 110-117

L’affaire relative à la réglementation wallonne du financement du vote électronique a été l’occasion, pour la Cour constitutionnelle, de revenir dans son arrêt n° 58/2016 du 28 avril 2016 sur les notions ... [more ▼]

L’affaire relative à la réglementation wallonne du financement du vote électronique a été l’occasion, pour la Cour constitutionnelle, de revenir dans son arrêt n° 58/2016 du 28 avril 2016 sur les notions de budget et de cavalier budgétaire, ainsi que sur la durée de vie de ce genre controversé de dispositions et sur la compétence d’avis du Conseil d’État en la matière. Confrontée pour la première fois à certaines problématiques qu’engendrent les cavaliers budgétaires, la Cour constitutionnelle s’est néanmoins refusée à trancher l’ensemble des débats. [less ▲]

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See detailComparison of soil water potential sensors: a drying experiment
Degré, Aurore ULg; van der Ploeg, Martine; Caldwell, Todd et al

in Vadose Zone Journal (2017), 16(4),

The soil water retention curve (WRC) plays a major role in soil’s hydrodynamic behaviour. Many measurement techniques are currently available for determining WRC in the laboratory. Direct in situ WRC can ... [more ▼]

The soil water retention curve (WRC) plays a major role in soil’s hydrodynamic behaviour. Many measurement techniques are currently available for determining WRC in the laboratory. Direct in situ WRC can be obtained from simultaneous soil moisture and water potential readings covering a wide tension range, from saturation to wilting point. There are many widely used soil moisture probes. Whereas near-saturation tension can be measured using water-filled tensiometers, wider ranges of water potential require new, more expensive and less widely used probes. This paper reports on a comparison of three types of soil water potential sensors that could allow us to measure water potential in the field, with a range relevant to water uptake by plants. Polymer tensiometers (POTs), MPS-2 probes and pF-meters were compared, in a controlled drying experiment. The study showed that the POTs and MPS-2 probes had good reliability in their respective range. Combined with a soil moisture probe, these two sensors can provide observed WRCs. The pF-meters below -30 kPa were inaccurate and their response was sensitive to measurement interval, with greater estimated suction at shorter measurement intervals. Recommendations are provided for future tests. In situ-WRC can provide supplementary information, particularly with regard to its spatial and temporal variability. It could also improve the results of other measurement techniques, such as geophysical observations. [less ▲]

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See detailPhase-change materials and rigidity
Piarristeguy, A.; Pradel, A.; Raty, Jean-Yves ULg

in MRS Bulletin (2017), 42(1), 45-49

Rigidity theory is an extraordinary tool to understand glasses. This article demonstrates how this model can help in understanding the link between structure, dynamics, and subtler properties such as ... [more ▼]

Rigidity theory is an extraordinary tool to understand glasses. This article demonstrates how this model can help in understanding the link between structure, dynamics, and subtler properties such as drift and aging, in particular, in phase-change materials (PCMs). First, a map of flexible/rigid regions in the Ge-(Sb)-Te system is drawn on the basis of atomistic structures modeled either by ab initio or reverse Monte Carlo techniques. A clear link between the flexible/rigid nature of the glass and its aging behavior is shown through resistivity drift as a function of composition measurements in amorphous GexTe100-x. In the particular case of amorphous GeTe, application of rigidity theory indicates that the average number of mechanical constraints decreases during aging, making the glass less stressed-rigid. Finally, the stability of PCMs also depends on the topology of the materials. The increasing number of constraints in GeTe when doped with C or N results in increased stability of the PCM. © 2017 Materials Research Society. [less ▲]

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See detailA new electron-ion coincidence 3D momentum-imaging method and its application in probing strong field dynamics of 2-phenylethyl-N, N-dimethylamine
fan, lin; Lee, Suk Kyoung; Tu, Yi-Jung et al

in Journal of Chemical Physics (2017)

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