Last 7 days
Bookmark and Share    
Full Text
Peer Reviewed
See detailRelic charcoal hearth soils: A neglected carbon reservoir. Case study at Marsiliana forest, Central Italy
Mastrolonardo, Giovanni ULiege; Francioso, Ornella; Certini, Giacomo

in Geoderma (2018), 315

Charcoal production in forests is one of the oldest forms of forest exploitation. The legacy of such once widespread activity is a plethora of relic charcoal hearths (RCHs1), where soil shows a thick ... [more ▼]

Charcoal production in forests is one of the oldest forms of forest exploitation. The legacy of such once widespread activity is a plethora of relic charcoal hearths (RCHs1), where soil shows a thick, black, charcoal-rich top horizon. Even where very common, such as in European forests, RCHs were rarely studied to assess their relevance as C reservoir. For this purpose, as a case study, we investigated some RCHs at Marsiliana, a typical Mediterranean oak forest from Central Italy. We found that RCHs soils, in spite of representing < 0.5% of total surface, gave a substantial contribution in terms of C, i.e. 1.1% to 4.2% of total ecosystem C, including litter, the top 30 cm of soil, deadwood, above-ground and below-ground biomass. On average, soil C content in RCHs was eight times higher than the soil outside the RCHs. The environmental significance of RCHs soils appears still greater considering that, on average, 43% of their C stock was charcoal, a form of C highly recalcitrant to mineralization. These results would stress the importance of accounting for the contribution of RCHs in terms of soil C and giving an estimation of their charcoal content in future C inventories, both as macroscopic and microscopic particles in soil. This study support the necessity of safeguarding the anthropogenic soils of RCHs as a precious C reservoir as well as a memory of past land uses. [less ▲]

Detailed reference viewed: 11 (10 ULiège)
Full Text
See detailDroit matériel européen 2017-2018 - Recueil de documentation
Van Cleynenbreugel, Pieter ULiege

Learning material (2018)

Detailed reference viewed: 6 (1 ULiège)
Full Text
Peer Reviewed
See detailStable versus Unstable Grade 2 High Ankle Sprains in Athletes: A Noninvasive Tool to Predict the Need for Surgical Fixation
D'Hooghe, Pieter; Bouhdida, S; Whiteley, R et al

in Clinical Research on Foot & Ankle (2018), 6(1), 252

There are no standardized criteria for the diagnosis and management of syndesmotic injuries, creating great ambiguity regarding optimal treatment. Traditionally, individuals with clinical and/or ... [more ▼]

There are no standardized criteria for the diagnosis and management of syndesmotic injuries, creating great ambiguity regarding optimal treatment. Traditionally, individuals with clinical and/or radiological suspicion of syndesmotic instability warrant an examination under anaesthesia and/or diagnostic arthroscopy to confirm and treat. Our purpose was to identify clinical syndesmotic instability without the need of invasive arthroscopic procedures. However, the invasive process of this has inherent risks to the patient. We developed a device to dynamically evaluate the distal tibiofibular stability during external rotation of the ankle as an extension to the available clinical tests. We compared the results of this device with intra-operative arthroscopic findings in 15 athlete cases with isolated grade 2 syndesmotic instability and found very good correlation, especially when tested in dorsiflexion. We consider this syndhoo device very helpful as part of the available options in the clinical diagnosis of syndesmotic instability. [less ▲]

Detailed reference viewed: 10 (10 ULiège)
Full Text
Peer Reviewed
See detailEnergy harvesting from different aeroelastic instabilities of a square cylinder
Andrianne, Thomas ULiege; Aryoputro, Renar; Laurent, Philippe ULiege et al

in Journal of Wind Engineering & Industrial Aerodynamics (2018), 172

This paper presents an experimental and numerical investigation of the power extraction from the oscillations of a square beam due to aeroelastic instabilities. The energy harvesting is performed using a ... [more ▼]

This paper presents an experimental and numerical investigation of the power extraction from the oscillations of a square beam due to aeroelastic instabilities. The energy harvesting is performed using a coil-magnet arrangement connected to a variable resistance load with the target objective to auto-power a remote sensor. Two aeroelastic phenomena are investigated: Vortex Induced Vibration (VIV) and cross-flow galloping. The first instability (VIV) is analyzed on a free-standing vertical structure. A second experimental set-up is developed on a horizontal square cylinder supported by springs, free to oscillate vertically as a rigid body. In this case, both galloping and VIV interact, leading to interesting characteristics in order to harvest energy from the wind. The behavior of each electro-mechanical aeroelastic system is investigated for different reduced wind speeds and load resistances in a wind tunnel. Observed efficiencies are rather low, but large enough to power a remote sensor with an adapted measuring strategy. Both harvesting systems are then studied numerically using a wake oscillator model (for VIV) coupled to a quasi-steady model (for galloping) and an electric model (for the harvester). This mathematical model is used to extend the parametric space and to highlight the effectiveness of the high stable branch of the VIV-galloping curve to harvest energy. [less ▲]

Detailed reference viewed: 20 (1 ULiège)
Full Text
Peer Reviewed
See detailUtilisation de l’imagerie hyperspectrale proche infrarouge combinée aux outils de la chimiométrie dans l’étude de systèmes racinaires.
Eylenbosch, Damien ULiege; Fernández Pierna, Juan Antonio; Baeten, Vincent et al

in Recueil de communications (2018, January)

In studies on root systems using the soil coring method, roots, crop residues and soil particles extracted after washing of soil samples need to be manually sorted before root quantification. If different ... [more ▼]

In studies on root systems using the soil coring method, roots, crop residues and soil particles extracted after washing of soil samples need to be manually sorted before root quantification. If different species are present in the sample, their discrimination is based on several criteria. In order to reduce the complexity and the time needed for this tedious sorting step, near infrared hyperspectral imaging was used to discriminate all these elements. Images of washed and dried samples were acquired with a camera saving, for each pixel, a near infrared spectrum. These spectra are linked to the physicochemical nature of the elements visible on the hyperspectral images and were analyzed with discriminant algorithms allowing their discrimination and to link each pixel spectrum to the nature of the elements. According to the number of pixels classified as roots and thanks to the linear relationship between the number of pixels and the root biomass in the sample, it was possible to quantify roots in soil samples without manual sorting and weighing. This methodology was successfully tested on winter wheat roots and highlighted the tillage effect on root system development. It was also tested on wheat-pea intercropping in order to quantify separately the roots of each species. [less ▲]

Detailed reference viewed: 12 (12 ULiège)
Full Text
See detailDroit matériel européen 2017-2018 - Agenda et plan du cours
Van Cleynenbreugel, Pieter ULiege

Learning material (2018)

Detailed reference viewed: 7 (1 ULiège)
See detailThe Emblem in the European Stage (16th-18th c.)
De Marco, Rosa ULiege; Guiderdoni, Agnès

Book published by Glasgow Emblem Studies Librarie Droz (2018)

Detailed reference viewed: 13 (13 ULiège)
Full Text
Peer Reviewed
See detailAltered Expression of MicroRNAs in Rheumatoid Arthritis
Tavasolian, F.; Abdollahi, E.; Rezaei, R. et al

in Journal of Cellular Biochemistry (2018), 119(1), 478-487

Detailed reference viewed: 8 (0 ULiège)
Full Text
Peer Reviewed
See detailBelgium
Husson, Jean-François ULiege

in Yearbook of Muslims en Europe (2018), 9

This article reviews the position of Muslims in Belgium in 2016 in various aspects: demography, discrimination, relations with public authorities, public funding, Muslim organisations, etc.

Detailed reference viewed: 8 (0 ULiège)
Peer Reviewed
See detailTypologies of solidarity in EU law: a non–shifting landscape in the wake of economic crises
Van Cleynenbreugel, Pieter ULiege

in Biondi, Andrea; Dagilyte, Egle; Küçük, Esin (Eds.) Solidarity in EU Law Legal Principle in the Making (2018)

Detailed reference viewed: 11 (0 ULiège)
See detailThe role(s) of innovation in competition law analysis
Van Cleynenbreugel, Pieter ULiege; Nihoul, Paul

Book published by Edward Elgar (2018)

This volume assembles the contributions presented at the ASCOLA Conference 2016 on innovation in (EU) competition law, which I co-organised.

Detailed reference viewed: 15 (0 ULiège)
Full Text
See detailChapter Ground-based soil moisture determination. In: Ecohydrology. Observation and Measurement of Ecohydrological Processes
Jonard, François; Bogena, Heye; Caterina, David et al

Book published by Springer (2018)

Detailed reference viewed: 11 (0 ULiège)
Full Text
Peer Reviewed
See detailThe Creative Economy as a Versatile Policy Script: Exploring the Role of Competing International Organizations
Vlassis, Antonios ULiege; De Beukelaer, Christiaan

in Media, Culture & Society (2018)

Detailed reference viewed: 5 (5 ULiège)
Full Text
See detailAnalyse comparative de la motivation et du sentiment d’efficacité comme facteurs d’engagement liés à la créativité. Cas de futurs enseignants de niveau préscolaire en Roumanie et en Belgique. Projet PEERS 2016-2017
Hausman, Matthieu ULiege

Conference (2017, December 15)

Retour d'expérience sur un projet PEERS mené conjointement entre la Haute Ecole de la Ville de Liège (Belgique) et l'Université Alexandru Ioan Cuza de Iasi (Roumanie). Projet réunissant deux équipes d ... [more ▼]

Retour d'expérience sur un projet PEERS mené conjointement entre la Haute Ecole de la Ville de Liège (Belgique) et l'Université Alexandru Ioan Cuza de Iasi (Roumanie). Projet réunissant deux équipes d'étudiants et enseignants-chercheurs autour du concept de créativité. Les étudiants sont-ils motivés à l'idée de s'engager dans des tâches mobilisant de la créativité? Qu'en est-il de leur sentiment d'efficacité personnelle face à ces tâches? Ce sont ces deux questions qui ont mobilisés les équipes de recherche. Les résultats font état d'une motivation avérée ainsi que d'un sentiment positif. Toutefois, ils ne permettent pas d'observer des différences significatives entre étudiants ayant déjà vécu ce type de tâches et d'autres, inexpérimentés, ni entre les étudiants des deux institutions concernées. [less ▲]

Detailed reference viewed: 12 (11 ULiège)
Full Text
See detailSensitivity of the Antarctic surface mass balance to oceanic perturbations
Kittel, Christoph ULiege; Amory, Charles ULiege; Agosta, Cécile ULiege et al

Poster (2017, December 15)

Regional climate models (RCMs) are suitable numerical tools to study the surface mass balance (SMB) of the wide polar ice sheets due to their high spatial resolution and polar-adapted physics. Nonetheless ... [more ▼]

Regional climate models (RCMs) are suitable numerical tools to study the surface mass balance (SMB) of the wide polar ice sheets due to their high spatial resolution and polar-adapted physics. Nonetheless, RCMs are driven at their boundaries and over the ocean by reanalysis or global climate model (GCM) products and are thus influenced by potential biases in these large-scale fields. These biases can be significant for both the atmosphere and the sea surface conditions (i.e. sea ice concentration and sea surface temperature). With the RCM MAR, a set of sensitivity experiments has been realized to assess the direct response of the SMB of the Antarctic ice sheet to oceanic perturbations. MAR is forced by ERA-Interim and anomalies based on mean GCM biases are introduced in sea surface conditions. Results show significant increases (decreases) of liquid and solid precipitation due to biases related to warm (cold) oceans. As precipitation is mainly caused by low-pressure systems that intrude into the continent and do not penetrate far inland, coastal areas are more sensitive than inland regions. Furthermore, warm ocean representative biases lead to anomalies as large as anomalies simulated by other RCMs or GCMs for the end of the 21st century. [less ▲]

Detailed reference viewed: 25 (4 ULiège)
Full Text
See detailAn extension of the Pascal triangle and the Sierpiński gasket to finite words
Stipulanti, Manon ULiege

Conference (2017, December 15)

The binomial coefficient (u,v) of two finite words u and v (on a finite alphabet) is the number of times the word v appears inside the word u as a subsequence (or, as a "scattered" subword). For instance ... [more ▼]

The binomial coefficient (u,v) of two finite words u and v (on a finite alphabet) is the number of times the word v appears inside the word u as a subsequence (or, as a "scattered" subword). For instance, (abbabab,ab)=4. This concept naturally extends the classical binomial coefficients of integers, and has been widely studied for about thirty years (see, for instance, Simon and Sakarovitch). In this talk, I present the research lead from October 2015: I give the main ideas that lead to an extension of the Pascal triangles to base-2 expansions of integers and also give an overview of the results obtained so far, linked to this generalization. [less ▲]

Detailed reference viewed: 13 (12 ULiège)
See detailFive years of harvest with the vortex coronagraph
Absil, Olivier ULiege

Scientific conference (2017, December 15)

While the concept of vortex coronagraphy dates back to 2005, the first science-grade Annular Groove Phase Masks (AGPM), working in the thermal infrared regime, have been installed at the VLT only in 2012 ... [more ▼]

While the concept of vortex coronagraphy dates back to 2005, the first science-grade Annular Groove Phase Masks (AGPM), working in the thermal infrared regime, have been installed at the VLT only in 2012. They are now also equipping the Keck telescope and the Large Binocular Telescope, and will soon be at the core of more ground-based high-contrast imaging instruments. In this seminar, I will shortly review the technology development undertaken over the last 10 years, and describe the on-sky operations and performance of the vortex coronagraph. I will then present the main scientific results obtained since 2012, and explain how we have recently adapted deep learning techniques to the problem of post-processing in high-contrast imaging. I will finally discuss the perspectives with new instruments, including the Breakthrough Watch project. [less ▲]

Detailed reference viewed: 11 (2 ULiège)
See detailHardware vs. software: How to make the energy system smarter?
Jacqmin, Julien ULiege

Conference (2017, December 15)

Detailed reference viewed: 20 (20 ULiège)