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See detailNondestructive inspection of aerospace composites by a fiber-coupled laser ultrasonics system
Vandenrijt, Jean-François ULiege; Languy, Fabian ULiege; Thizy, Cédric ULiege et al

in Proceedings of SPIE (2017, June)

Laser ultrasonics is a technique currently studied for nondestructive inspection of aerospace composite structures based on carbon fibers. It combines a pulsed laser impacting the surface generates an ... [more ▼]

Laser ultrasonics is a technique currently studied for nondestructive inspection of aerospace composite structures based on carbon fibers. It combines a pulsed laser impacting the surface generates an ultrasound inside the material, through the nondestructive thermoelastic effect. Second a detection interferometer probes the impacted point in order to measure the displacement of the surface resulting from the emitted ultrasound wave and the echo coming back from the different interfaces of the structure. Laser ultrasonics is of interest for inspecting complex shaped composites. We have studied the possibility of using frequency doubled YAG laser for the generation and which is fiber-coupled, together with a fiber-coupled interferometric probe using a YAG laser in the NIR. Our final system is a lightweight probe attached to a robot arm and which is able to scan complex shapes. The performances of the system are compared for different wavelengths of generations. Also we have studied some experimental parameters of interest such as tolerance to angle and focus distance, and different geometries of generation beams. We show some examples of inspection of reference parts with known defects. In particular C-scans of curved composites structures are presented. [less ▲]

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See detailActualités dans le traitement des tendinopathies
Sauvant, Céline; Kaux, Jean-François ULiege

in Journal de Traumatologie du Sport (2017), 34(2), 99-107

Tendon injuries caused by overuse have been described as “tendinitis” for years before it was demonstrated that the histopathological process wasnot due to intratendinous inflammation. Cook and Purdam ... [more ▼]

Tendon injuries caused by overuse have been described as “tendinitis” for years before it was demonstrated that the histopathological process wasnot due to intratendinous inflammation. Cook and Purdam proposed a continuum model of tendon pathology, which provides a better understandingof the condition and the possibility to adapt the treatment. This allows a better recovery and a lower recurrence rate of the tendinopathy. This articleis a review of current treatments used in clinical practice. [less ▲]

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See detailDraw me a sheep: a pedagogical tool to discover the complexity of rural planning
Schmitz, Serge ULiege

Conference (2017, June)

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See detailInsect fatty acids: A comparison of lipids from three Orthopterans and Tenebrio molitor L. larvae
Paul, Aman ULiege; Frederich, Michel ULiege; Caparros Megido, Rudy ULiege et al

in Journal of Asia-Pacific Entomology (2017), 20(2), 337-340

In order to explore some potential insect sources of food lipids, the lipid compositions of three Orthopterans (Acheta domesticus, Conocephalus discolor and Chorthippus parallelus) were analyzed and ... [more ▼]

In order to explore some potential insect sources of food lipids, the lipid compositions of three Orthopterans (Acheta domesticus, Conocephalus discolor and Chorthippus parallelus) were analyzed and compared with those of Tenebrio molitor larvae. A. domesticus, Co. discolor, Ch. parallelus and T. molitor larvae were found to contain approximately 15%, 13%, 10% and 32% lipids on dry weight, respectively. The lipids from three Orthopterans contain much higher amounts of essential fatty acids than those of T. molitor larvae. The two Orthopterans of the suborder Ensifera i.e., A. domesticus and Co. discolor contain linoleic acid in major quantities, while Ch. parallelus of the suborder Caelifera, contain α-linolenic acid in major quantities. The consumption of linoleic and α-linolenic fatty acid is linked with numerous health promoting effects. The factors that contribute to differences in fatty acid profiles of these insects are being discussed. At last the nutritional parameters including polyunsaturated to saturated and omega 6 to omega 3 fatty acid ratios of these insect lipids are also being discussed to understand the potential role of these lipids in human nutrition. [less ▲]

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See detailMise en forme de principe actif par double émulsion pour application pharmaceutique
Roex, Edith ULiege

Master's dissertation (2017)

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See detailTraumatologie des sports olympiques de ballon en salle. Partie 1: le basket-ball
Kaux, Jean-François ULiege; Roberjot, Mathieu; DELVAUX, François ULiege et al

in Journal de Traumatologie du Sport (2017), 34(2), 108-113

Basketball, handball and volleyball are three indoor ball sports played in the Olympic Games. An important solicitation of the upper limbs is acommon characteristic of these three sports. The main ... [more ▼]

Basketball, handball and volleyball are three indoor ball sports played in the Olympic Games. An important solicitation of the upper limbs is acommon characteristic of these three sports. The main objective of this review of the literature is to analyze the types of injury occurring in thesethree indoor ball games, looking for the specific localizations and their potential causes. Each sport will be discussed in a specific publication.Basketball is a very popular sport with a growing number of participants. The intensity of the game has increased as it has become more physical,leading to an increasing number of injuries. Ankle sprain is the most common injury in basketball. Back pain, finger fracture and tendon injury(jumper’s knee) or knee injury (anterior cruciate ligament tears) are also common. The main mechanism of traumatic injury is direct contact withthe opponent (during games) but there is also an increasing number of over-solicitation injuries. The length of time players must avoid sportsactivities after injury depends on the type of injury involved. [less ▲]

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See detailAutomatic phase identification of smart meter measurement data
Olivier, Frédéric ULiege; Ernst, Damien ULiege; Fonteneau, Raphaël ULiege

in Proc. of CIRED 2017 (2017, June)

This paper highlights the importance of the knowledge of the phase identification for the different measurement points inside a low-voltage distribution network. Besides considering existing solutions, we ... [more ▼]

This paper highlights the importance of the knowledge of the phase identification for the different measurement points inside a low-voltage distribution network. Besides considering existing solutions, we propose a novel method for identifying the phases of the measurement devices, based exclusively on voltage measurement correlation. It relies on graph theory and the notion of maximum spanning tree. It has been tested on a real Belgian LV network, first with simulated unbalanced voltage for which it managed to correctly identify the phases of all measurement points, second, on preliminary data from a real measurement campaign for which it shows encouraging results. [less ▲]

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See detailPeriod–luminosity relations of fast-rotating B-type stars in the young open cluster NGC 3766
Saio, H.; Ekström, S.; Mowlavi, N. et al

in Monthly Notices of the Royal Astronomical Society (2017), 467(4), 3864-3873

We study the pulsational properties of rapidly rotating main-sequence B-type stars using linear non-adiabatic analysis of non-radial low-frequency modes taking into account the effect of rotation. We ... [more ▼]

We study the pulsational properties of rapidly rotating main-sequence B-type stars using linear non-adiabatic analysis of non-radial low-frequency modes taking into account the effect of rotation. We compare the properties of prograde sectoral g and retrograde r modes excited by the κ mechanism at the Fe opacity peak with the newly discovered period–luminosity relation that is obeyed by a group of fast-rotating B-type stars in the young open cluster NGC 3766. The observed relation consists of two sequences in the period versus magnitude diagram, at periods shorter than 0.5 d. We find that this property is consistent with similar period–luminosity relations predicted for excited sectoral prograde g modes of azimuthal orders m = −1 and −2 in fast-rotating stars along an isochrone. We further show that some of the rapidly rotating stars that have photometric variability with periods longer than a day may be caused by r-mode pulsation predicted to be excited in these stars. One fast-rotating star, in particular, shows both short and long periods that can be explained by the simultaneous excitation of g- and r-mode pulsations in models of fast-rotating stars. [less ▲]

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See detailForeign Policy & International Development
Carlsen, Henrik; Pearson, Nakia ULiege

in High-end Climate Change Policy Booklet (2017)

The conceptual framework for the chapter is based on the notion of “transnational climate impacts” (Benzie et al, 2016). By this we mean impacts that will require adaptation in the EU as a result of ... [more ▼]

The conceptual framework for the chapter is based on the notion of “transnational climate impacts” (Benzie et al, 2016). By this we mean impacts that will require adaptation in the EU as a result of climate change in other countries. [less ▲]

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See detailEvaluation of Non-negative matrix Factorization of grey matter in age prediction
Varikuti, Deepthi; Genon, Sarah ULiege; 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 detailProfiling inferior left dorsal premotor cortex: when Area 55b meets Premotor Eye-Field
Genon, Sarah ULiege; Reid, Andrew; Langner, Robert et al

Poster (2017, June)

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See detailRegistered partnerships
Wautelet, Patrick ULiege

in Basedow, Jürgen; Ferrari, Franco; de Miguel Asensio, Pedro (Eds.) et al EUROPEAN ENCYCLOPEDIA OF PRIVATE INTERNATIONAL LAW (2017)

This entry in the European Encyclopedia of Private International Law attempts to present the current state of the law in relation to registered partnerships. After an overview of the relevant sources ... [more ▼]

This entry in the European Encyclopedia of Private International Law attempts to present the current state of the law in relation to registered partnerships. After an overview of the relevant sources, attention is paid to the issue of characterization. The law applicable to the access to partnerships and effects of such partnerships is also covered. [less ▲]

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See detailA decision support tool for transient stability preventive control
Pertl, Michael; Weckesser, Johannes ULiege; Rezkalla, Michel et al

in Electric Power Systems Research (2017), 147

The paper presents a decision support tool for transient stability preventive control contributing to increased situation awareness of control room operators by providing additional information about the ... [more ▼]

The paper presents a decision support tool for transient stability preventive control contributing to increased situation awareness of control room operators by providing additional information about the state of the power system in terms of transient stability. A time-domain approach is used to assess the transient stability for potentially critical faults. Potential critical fault locations are identified by a critical bus screening through analysis of pre-disturbance steady-state conditions. The identified buses are subject to a fast critical contingency screening determining the actual critical contingencies/buses. These two screenings aim at reducing the computational burden of the assessment, since only contingencies considered as critical are taken into account. The critical clearing times for the critical contingencies are determined. A preventive re-dispatch of generators to ensure a predefined minimum critical clearing time for faults at all buses is proposed, while costs are minimized. The results of the assessment are presented to the control room operator, who decides to accept the suggested dispatch or to repeat the assessment considering additional user-specific constraints. The effectiveness of the proposed method is demonstrated on a standard nine-bus and the New England test system. [less ▲]

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See detailInitiatives et mécanismes correcteurs
Guisset, AL; Dispas, H; Meunier, P et al

in Santé Conjuguée (2017), 79

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See detailNumerical modelling of micro-plasto-hydrodynamic lubrication in plane strip drawing
Carretta, Yves ULiege; Bech, Jakob; Legrand, Nicolas et al

in Tribology International (2017), 110

This paper presents a new finite element model capable of predicting the onset of micro-plasto-hydrodynamic (MPH) lubrication and the amount of lubricant escaping from surface pockets in metal forming ... [more ▼]

This paper presents a new finite element model capable of predicting the onset of micro-plasto-hydrodynamic (MPH) lubrication and the amount of lubricant escaping from surface pockets in metal forming. The present approach is divided in two steps. First, a simulation at the macroscopic level is conducted. Then, a second simulation highlighting microscopic liquid lubrication mechanisms is achieved using boundary conditions provided by the first model. These fluid-structure interaction computations are made possible through the use of the Arbitrary Lagrangian Eulerian (ALE) formalism. The developed methodology is validated by comparison to experimental measurements conducted in plane strip drawing. The effect of physical parameters like the drawing speed, the die angle and the strip thickness reduction is investigated. The numerical results show good agreement with experiments. [less ▲]

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See detailApproche intégrée de l’éthique et l’intégrité scientifique à l’Université de Liège
Halleux, Isabelle ULiege

Scientific conference (2017, June)

This talk was presented to the boards of French universities in order to share the Ulg model and good practices in ethics. The integrated approach includes actions coordinated by the Council for Ethics ... [more ▼]

This talk was presented to the boards of French universities in order to share the Ulg model and good practices in ethics. The integrated approach includes actions coordinated by the Council for Ethics and Scientific Integrity (CEIS) which are developed simultaneously through 5 axes. Researchers are involved at all levels of the process, directly or as representative of their group. 1. Training: Sensitization and education to ethics; development of professional capacities, incl. data analysis & open data; seminaries with supervisors and PhDs ("duos") 2. Forum: ethics on the public space – Seminaries, conference, round tables, intervision, discussion and exchange on questions, dilemma, case-studies, with the help of external experts 3. Research appraisal: requirement for an ethics appraisal of each research project, with a special focus on human and social sciences, with the help of disciplinary ethics committees 4. Ethics analysis: Analysis of special questions, complains, problems, and decision making in case of violation of integrity 5. Regulation: Writing of procedures, dissemination of documents, recommendations and case-studies, link to the HR Strategy for researchers and the Charter and Code. This presentation aimed to exchange about what was done, the actual and expected impact of actions, what is going right and wrong, and how ULg is managing this dynamics as part of the HR Strategy for researchers project. [less ▲]

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See detailChallenges of Trace Mineral Diagnosis
Guyot, Hugues ULiege

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 detailThe Use of Inflammatory Markers in Field Cattle Medicine
Guyot, Hugues ULiege

in ACVIM Forum Proceedings (2017, June)

Numerous cow-side diagnostic tests are available for bovine practitioners. Many of these tests serve etiologic purposes such as quick test for diarrhea or measures of metabolites directly linked to ... [more ▼]

Numerous cow-side diagnostic tests are available for bovine practitioners. Many of these tests serve etiologic purposes such as quick test for diarrhea or measures of metabolites directly linked to pathologies (BOH or ions Ca++, Na+, K+, etc.). Beside these interesting elements, inflammation, which is either a cause or a consequence of a specific disease, is often forgotten. This presentation will refresh the practitioner’s knowledge on the assessment of inflammation in cattle by using inflammatory markers assayed with laboratory and cow-side tests. The interpretation of these markers can be sometimes delicate (bias) and might not necessarily lead to a prognosis. Depending on the age of the animal, some inflammatory markers can also serve as diagnosis for other purposes such as the evaluation of passive immunity transfer in calves. [less ▲]

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See detailEnvironmental Protection and Tax Law: Belgian approach to the development of renewable energy and sustainable transport
Vanrykel, Fanny ULiege

Scientific conference (2017, June)

In the relation between human kind and nature, humans are often the strong and the environment the weak. Humans destroy animals’ habitat, affect biodiversity and cause climate change. By their behaviors ... [more ▼]

In the relation between human kind and nature, humans are often the strong and the environment the weak. Humans destroy animals’ habitat, affect biodiversity and cause climate change. By their behaviors, they also threaten future generations. Progressively, the law has started to regulate this relation and environmental law has emerged. Quickly, taxes and tax incentives have been considered a useful mean to achieve environmental protection. This contribution tells the story of how taxes and tax incentives have been used in Belgium to influence human behaviors towards a greater protection of the environment. In particular, it addresses the issue of climate change, by focusing on two aspect of this question: the development of renewable energy and sustainable transport. It is divided in two parts. The first one presents the current tax measures in relation with this question while the second one deals with their ability to achieve their goal. [less ▲]

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