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See detailRegional crop modelling and yield forecasting: opportunities in coupling models and satellite data
Wellens, Joost ULg; Derouane, Johan

Conference (2014, November)

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See detailDon / Langage / Contretemps. Diagonales giovannangeliennes. Actes de la rencontre autour du travail de Daniel Giovannangeli. Université Saint-Louis Bruxelles, 2 mai 2014
Gavray, Marc-Antoine ULg; Gély, Raphaël; Richard, Sébastien

Book published by Université de Liège. Département de philosophie (2014)

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See detail"Über Ländergrenzen hinaus" - Der Deutsche Buchpreis und seine Wirkung
Houscheid, Karin ULg

in Literaturkritik.de (2014)

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See detailEtude de la forme d'arcade dentaire après nivellement en technique Damon.
LEWY, Stéphanie; LIMME, Michel ULg; BRUWIER, Annick ULg

Poster (2014, November)

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See detailTechnical report of goat activities
Andres, Ludovic ULg

Report (2014)

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See detailEvalulating the additional value of the illness perceptions questionnaire in patients with chronic low back pain
Leysen, M; Nijs, J; Van Wilgen, CP et al

in Abstract Book of 7th Biennial Congress of The Belgian Back Society (2014, November)

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See detailShould I Access or Should I Own? Consumers' Perceived risks in Collaborative Consumption
Hazee, Simon ULg; Delcourt, Cécile ULg; Van Vaerenbergh, Yves

Scientific conference (2014, November)

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See detailStress and singing accuracy: What is the relationship?
Larrouy, Pauline ULg

Conference (2014, October 31)

Singing in public can be stressful and stress affects the control of the fundamental frequency, i.e. a critical element to control in order to sing in tune. It seems thus clear that singing in public will ... [more ▼]

Singing in public can be stressful and stress affects the control of the fundamental frequency, i.e. a critical element to control in order to sing in tune. It seems thus clear that singing in public will have an influence on vocal accuracy. In addition, the quality of a musical performance can be lessened or enhanced if the performer experiences stressful conditions. In order to clarify the effects of stress on singing accuracy and to explore solutions to favor the positive consequences of stress, we ran an experiment in collaboration with the Royal Conservatory of Liège. Thirty-one music students were asked to learn a simple melody. There were then recorded in a stressful condition (i.e., a music examination) and a non-stressful condition. Two groups were defined according to the challenge level of the music examination (first and second music levels). Measurements were made by self-reported state anxiety (CSAI-2R questionnaire) and by observing heart rate activity (electrocardiogram) during each performance. In addition, the vocal accuracy of the sung performances (in terms of respect of melodic contour, precision of intervals and respect of the tonality) was objectively analyzed. As expected, state anxiety and heart rate were significantly higher on the day of the music examination than in the non-stressful condition for all the music students. However, the effect of stress was positive for the first-year students but negative for the second-year students, for whom the music examination was particularly challenging. In addition, highly significant correlations were found between the intensity of cognitive symptoms and the vocal accuracy criteria. This study highlights the contrasting effects of stress on singing voice accuracy. The results encourage searchers to take into account the stress level of the performer when evaluating singing accuracy. In addition, it seems pertinent to work on the perception of somatic and cognitive symptoms in higher music institutions and to try to diminish the stress level of students, in order to favor the positive consequences of stress on the quality of musical performances. Thanks to this method, we are actually focusing on studies designed to better understand the effects of stress on speaking voice. [less ▲]

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See detailPlutella xylostella (L.) infestations at varying temperatures induce the emission of specific volatile blends by Arabidopsis thaliana (L.) Heynh
Hien, Truong Thi Dieu ULg; Delory, Benjamin ULg; Brostaux, Yves ULg et al

in Plant Signaling & Behavior (2014)

The effect of combined abiotic and biotic factors on plant volatile organic compound (VOC) emissions is poorly understood. This study evaluated the VOC emissions produced by Arabidopsis thaliana (L.) Col ... [more ▼]

The effect of combined abiotic and biotic factors on plant volatile organic compound (VOC) emissions is poorly understood. This study evaluated the VOC emissions produced by Arabidopsis thaliana (L.) Col-0 subjected to three temperature regimes (17, 22, and 27 °C) in the presence and absence of Plutella xylostella larvae over two time intervals (0–4 and 4–8 h), in comparison to control plants. The analyses of VOCs emitted by Arabidopsis plants were made by headspace solid phase microextraction (HS-SPME) coupled with gas chromatography-mass spectrometry (GC-MS). It was found that certain volatile groups (e.g., alcohols, ketones, aldehydes, and terpenes) are induced by both single factors (temperature or larval infestation) and combined factors (temperature and larvae interactions), whereas other volatile groups (e.g., isothiocyanates [ITCs] and nitrile) were specific to the experimental conditions. ITCs (mainly 4-methylpentyl isothiocyanate) were emitted from plants subjected to larval infestation at 17 and 27 °C after the two time intervals. The proportions of sulfides (mainly dimethyl disulfide) and 4-(methylthio) butanenitrile were significantly higher on herbivore-infested plants at 22 °C compared to the other treatments. Overall, our findings indicate that changes in all experimental conditions caused significant changes to the VOC emissions of Arabidopsis plants. Therefore, the interaction between temperature and larval feeding may represent an important factor determining the variability of volatile emissions by plants subjected to multiple simultaneous factors. [less ▲]

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See detailcaractérisation physico-chimique et minéralogique de matériaux calcaro-dolomitiques en vue de la production de liants et produits dérivés
Matamba Jibikila, Raphaël ULg

Doctoral thesis (2014)

Due to their abundance and availability, limestone and dolomitic rocks are among the most valued resources in the world. As natural stones, they have many applications, both in trade and industrial ... [more ▼]

Due to their abundance and availability, limestone and dolomitic rocks are among the most valued resources in the world. As natural stones, they have many applications, both in trade and industrial sectors. Moreover, regardless of the scope of these materials, they must meet specific mineralogical and mechanical or physico-chemical properties, depending on the sector. Environmental requirements and sustainable management of mineral resources, have forced companies to reduce the value of naturally occurring materials, focusing oriented processing of waste materials or alternative approach. Moreover, technological developments have led to new applications requiring maximum purity of the material also led farmers to manage natural resources in a more rational manner. Mbuji-Mayi Region in the Democratic Republic of Congo, has huge limestone and dolomitic deposit; located in the " Mbuji-Mayi Supergroup". Nevertheless, the city suffers from a serious lack of sustainable infrastructure to consolidate its development and remains dependent on the supply of construction and building materials from other regions, located sometimes more than 1000 km from the Mbuji-Mayi site. The aim of this thesis is to investigate the potential use of Mbuji-Mayi supergroup materials to produce binder or derivated products in a sustainable management of mineral resources way. Thus, dolomitic samples were taken from Kanshi S13B and S70 Lubi drill cores, while limestone facies are from artisanal quarries in the region. They were then prepared and characterized. Techniques used are: X-ray fluorescence spectrometry (XRF), X-ray diffraction (XRD), thermogravimetric analysis and the differential scanning calorimetry (TG-DSC), optical microscopy (OM) and scanning electron microscopy combined with chemical microanalysis (SEM / EDX). The results obtained after raw materials characterization showed that the Mbuji-Mayi Supergroup contains pure dolomite (respective mean CaO and MgO contents of 20.5 and 30%), impure dolomites and impure limestones. uniaxial compressive strength test, water absorption coefficient, and porosity were measured. Results were satisfactory in terms of the use of materials such as rubbles or building stones. Thermal and microscopic analyzes of pure dolomite, showed that these materials have high added value in the areas of refractory, glass manufacture or dolomitic lime production. Finally, a binder (CS1c) prepared from impure limestone, posted quite sufficient characteristics for applications with low mechanical stress. Metakaolin prepared from local raw material, was used to improve the characteristics of the binder CS1c. The analysis of the properties of the mixture CS1c-metakaolin, helped us to understand the role of some mineral phases, in contributing to the development of mechanical strength of such binders.   [less ▲]

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See detailEngineering of poly(2-oxazoline)s for a potential use in biomedical applications
Legros, Camille ULg

Doctoral thesis (2014)

This PhD work is based on the design of poly(2-oxazoline) (POx) hydrogels and nanogels, by chemical or physical cross-linking, aimed to be used for biomedical applications. Nanogels were first prepared in ... [more ▼]

This PhD work is based on the design of poly(2-oxazoline) (POx) hydrogels and nanogels, by chemical or physical cross-linking, aimed to be used for biomedical applications. Nanogels were first prepared in dilute media and in inverse emulsion based on a statistical copolymer made of 2-ethyl-2-oxazoline and ethylene imine units. These stimuli-responsive nanogels were swelling in acidic media and were cleaved in reductive environment. They proved to be non-cytotoxic and act as protein repellent. Second, a reactive platform based on a statistical POx polymer bearing aldehyde functionalities was engineered, enabling the synthesis of graft and cross-linked POx. Last, a block copolymer made of 2-methyl- and 2-isopropyl-2- oxazoline units, proved to self-assemble into micelles when heated above its LCST, for a short period of time (< 1h30). When annealed for a longer time (> 1h30), crystallization-driven self-assembly led to the formation of different morphologies (fiber rods and cross-linked micelles). [less ▲]

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See detailLa représentation commerciale comme objet principal du contrat
Kéfer, Fabienne ULg

in Revue de Jurisprudence de Liège, Mons et Bruxelles (2014), (2014/35),

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See detailInjections de PRP et tendinopathies
Kaux, Jean-François ULg

Conference (2014, October 30)

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See detailInjury Risk Assessment of Non-Lethal Projectile Head Impacts
Oukara, Amar ULg; Robbe, Cyril; Nsiampa, Nestor et al

in The Open Biomedical Engineering Journal (2014), 8(2014), 75-83

Kinetic energy non-lethal projectiles are used to impart sufficient effect onto a person in order to deter uncivil or hazardous behavior with a low probability of permanent injury. Since their first use ... [more ▼]

Kinetic energy non-lethal projectiles are used to impart sufficient effect onto a person in order to deter uncivil or hazardous behavior with a low probability of permanent injury. Since their first use, real cases indicate that the injuries inflicted by such projectiles may be irreversible and sometimes lead to death, especially for the head impacts. Given the high velocities and the low masses involved in such impacts, the assessment approaches proposed in automotive crash tests and sports may not be appropriate. Therefore, there is a need of a specific approach to assess the lethality of these projectiles. In this framework, some recent research data referred in this article as “force wall approach” suggest the use of three lesional thresholds (unconsciousness, meningeal damages and bone damages) that depend on the intracranial pressure. Three corresponding critical impact forces are determined for a reference projectile. Based on the principle that equal rigid wall maximal impact forces will produce equal damage on the head, these limits can be determined for any other projectile. In order to validate the consistence of this innovative method, it is necessary to compare the results with other existing assessment methods. This paper proposes a comparison between the “force wall approach” and two different head models. The first one is a numerical model (Strasbourg University Finite Element Head Model-SUFEHM) from Strasbourg University; the second one is a mechanical surrogate (Ballistics Load Sensing Headform-BLSH) from Biokinetics. [less ▲]

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