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See detailQUALITY IMPROVEMENT OF POTATO STEAMED BREAD USING FOOD HYDROCOLLOIDS
Liu, Xingli ULiege

Doctoral thesis (2017)

Nowadays, there is an increasing interest for composite or gluten-free products due to some economic, nutritional reasons or the number of the celiac patient. The estimated prevalence of Celiac disease is ... [more ▼]

Nowadays, there is an increasing interest for composite or gluten-free products due to some economic, nutritional reasons or the number of the celiac patient. The estimated prevalence of Celiac disease is about 1% of the general population, and it affects persons of any age, race, and ethnic group. Steamed bread is a traditional staple food of China, and has been consumed for at least 2000 years, taking up almost 40% of wheat consumption, and the popularity is increasing around the world. However, most traditional wheat steamed bread lack essential nutrients, including lysine, dietary fiber, vitamins, and minerals, etc. Therefore, the use of composite flour for steamed bread making has attracted great attention. Potato (Solanum tuberosum) is one of the most widely planted vegetables worldwide and is the only tuber used as a major food crop. Potato has a balanced amino acid composition, high total vitamin and mineral levels, and also contains phytochemicals such as polyphenols, polyamines, and carotenoids. However, the replacement of wheat flour is a major challenge for food technologist to produce the steamed bread with desirable quality and technological properties because that gluten is important to retain gas to obtain the desired volume and texture in a dough system. It is essential to form a strong protein network required for the desired viscoelasticity, and the easiest way to ensure the viscoelasticity properties is via the use of food hydrocolloids. Therefore, the aim of this work was to study the quality improvement of potato steamed bread using food hydrocolloids. Firstly, the influence of potato flour on dough rheological properties and quality of steamed bread showed that the dough stability and specific volume of steamed bread were significantly decreased with the potato flour proportions increasing. Then we carried out the comparative study of the nutritional quality of steamed and baked breads from four potato cultivars because that the steamed and baked breads were two type of staple food in eastern and western countries, respectively. The results showed that potato flour addition increased the contents of dietary fiber, potassium, vitamin C, and total polyphenol contents and antioxidant activity. Hongmei was the optimum choose of the studied four cultivars, followed by Blue Congo, Shepody, and Atlantic, in terms of nutritional value. For the same cultivar, the nutritional value of steamed bread was higher than that of baked bread. Secondly, the effect of different food hydrocolloids on the dough rheology and steamed bread quality parameters in composite and gluten-free formulations based on potato flour was studied. Compared to control, the food hydrocolloids addition significantly increased tightly bound water population, water absorption, starch gelatinization temperature, dough viscoelasticity, recovery percentage and development height. Little adhesion and aggregation of starch were observed and the density of potato protein bands was decreased when food hydrocolloids were added, suggesting that some aggregation formed between starch-hydrocolloids or proteins-hydrocolloids. Moreover, steamed breads with food hydrocolloids presented higher specific volume, lower hardness, and lower estimated glycemic index. In conclusion, food hydrocolloids showed the potential as a gluten replacement in composite or gluten-free potato steamed bread, particularly HPMC. Thirdly, we optimized the formulations of gluten-free potato steamed bread. The optimal gluten-free steamed bread could be produced by adding 4.84 g/100g pregelatinized potato flour (PGPF), 1.68 g/100g hydroxypropylmethylcellulose (HPMC), 5.87 g/100g egg white protein (EWP) and 69.69 g/100g water based on potato flour, and this optimal bread was compatible with regular wheat bread in key sensory properties. Moreover, the optimized solid phase microextraction parameters (sample weight 2.42 g, extraction time 60 min, and extraction temperature 50°C) were adopted to determine the volatile compounds of gluten-free potato steamed bread. 72 volatile compounds were detected in the dough and crumb. The contents of alcohols, acids and esters increased significantly with the fermentation time increasing, which would improve the aroma of steamed bread. However, further investigations are needed to elucidate the underlying mechanisms of action and the interactions with dough components and making additives. The other studies should be focused on technological approaches to improve steamed bread quality, which involved different flour particles, high pressure technology and application of sourdough. [less ▲]

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See detailL’usage vocal des professeurs de formation musicale
Remacle, Angélique ULiege; Schiller, Isabel ULiege; Sfez, Lou et al

Conference (2017, June 29)

Introduction : En Belgique, les professeurs de formation musicale, ou professeurs de solfège, dispensent une éducation à la musique par un enseignement du langage musical. Plus précisément, ils enseignent ... [more ▼]

Introduction : En Belgique, les professeurs de formation musicale, ou professeurs de solfège, dispensent une éducation à la musique par un enseignement du langage musical. Plus précisément, ils enseignent l’apprentissage de la rythmique, de la lecture et de l’écriture de partitions, la pratique du chant, le développement de l’oreille musicale, ou encore la constitution d’un répertoire de référence. Ces enseignements sont dispensés dans des académies de musique ou des conservatoires. En tant que professionnels de la voix, ces professeurs font partie des travailleurs les plus à risque de consulter un phoniatre pour leur voix (1). Cependant, leur usage vocal reste peu décrit. Cette étude a pour objectif 1) de mesurer la charge vocale de professeurs de formation musicale en contexte professionnel et extra-professionnel, 2) de décrire l’influence du bruit ambiant sur leur voix et 3) d’identifier l’impact de la charge vocale sur leur qualité et leur fatigue vocale. Méthode : 13 professeurs de formation musicale (9 femmes, 4 hommes) ont été enregistrés pendant une semaine complète à l’aide d’un dosimètre vocal (VoxLog) porté du lever au coucher. Le dosimètre mesure la durée de phonation et la fréquence vocale (F0) avec un accéléromètre, ainsi que l’intensité de la voix et du bruit ambiant avec un microphone positionné au niveau du cou. L’analyse du signal est réalisée avec le logiciel VoxLog Discovery. Ce logiciel calcule notamment le nombre d’oscillations des plis vocaux par jour. A la fin de chaque journée, les professeurs ont auto-évalué leur qualité et leur fatigue vocale à l’aide d’échelles visuelles analogiques. Résultats : Les paramètres vocaux et le bruit ambiant sont significativement plus élevés en contexte professionnel qu’extra-professionnel (p<.001). L’élévation du bruit ambiant est accompagnée d’une élévation de l’intensité vocale pour les 13 professeurs (r=.61, p<.001), ainsi que d’une augmentation de F0 pour les femmes (r=.41, p=.002) mais non pour les hommes (r=.39, p=.055). Enfin, le bruit ambiant élevé est associé à une augmentation de la durée de phonation (r=.05, p<.001). L’augmentation du nombre d’oscillations journalier des plis vocaux est associée à une augmentation de la fatigue (r=0.438, p<.001) et à une diminution de la qualité vocale (r=-0.538, p<.001). Conclusion : De façon similaire aux professeurs d’école (2), les paramètres vocaux ainsi que le bruit ambiant sont significativement plus élevés en contexte professionnel. Sur leur lieu de travail, les professeurs d’éducation musicale sont confrontés à un bruit ambiant dépassant la limite recommandée par l’OMS (3). En accord avec l’effet Lombard, ce bruit élevé est associé à une augmentation de l’intensité vocale. Chez les femmes, une voix plus aigüe est observée en environnement bruyant. Comme dans l’étude de Ternström, Södersten et Bohman (4), un bruit ambiant élevé est associé à une durée de phonation plus importante, potentiellement dû à une prolongation des segments voisés par souci d’intelligibilité. En conclusion, les professeurs de formation musicale utilisent leur voix de manière intensive dans le cadre de leur travail, alternant voix parlée et voix chantée. Les corrélations entre le nombre d’oscillations journalier et les auto-évaluations montrent que la quantité de voix utilisée a un impact sur le ressenti des participants. De plus, l’élévation du bruit est corrélée à une augmentation des paramètres de charge vocale. Bibliographie 1. Remacle, A., Petitfils, C., Lejeune, L., Finck, C., & Morsomme, D. (2015, April 10). What is the professional profile of patients in phoniatrics? Oral communication presented at the 4th International Occupational Voice Symposium, London, UK. 2. Remacle, A., Morsomme, D., & Finck, C. (2014). Comparison of vocal loading parameters in kindergarten and elementary school teachers. Journal of Speech, Language, and Hearing Research, 57, 406-415. 3. Inserm. (2006). La voix : Ses troubles chez les enseignants (Expertise collective). Paris : Institut National de la Santé et de la Recherche médicale. 4. Ternström, S., Södersten, M., & Bohman, M. (2002). Correlation of simulated environmental noise as a tool for measuring vocal performance during noise exposure. Journal of Voice, 16(2), 195-206. [less ▲]

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See detailExperimental characterisation of tape spring nonlinear compliant mechanisms
Dewalque, Florence ULiege; Schwartz, Cédric ULiege; Denoël, Vincent ULiege et al

Conference (2017, June 29)

Tape springs are compliant mechanisms used as alternative to kinematic joints, for example, in deployable space structures. To reach a detailed understanding of their highly nonlinear behaviour, involving ... [more ▼]

Tape springs are compliant mechanisms used as alternative to kinematic joints, for example, in deployable space structures. To reach a detailed understanding of their highly nonlinear behaviour, involving buckling, the formation of folds, nonlinear vibrations and hysteresis, an experimental set-up is designed. Dynamic and quasi-static tests are performed, as well as small amplitude vibration tests and large amplitude deployments in order to collect data in a broad variety of cases. The acquisition equipment consists of a 3D motion analysis system which triangulates the position of active markers and a force plate. The reproducibility of the acquisitions is assessed and the parameters affecting the measurements are identified. In the end, a finite element model is developed and correlated with the experimental results. [less ▲]

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See detailL'intelligence territoriale en milieu rural
Devillet, Guénaël ULiege

Scientific conference (2017, June 29)

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See detailMean and variance of Dynamic Functional Connectivity in Parkinson’s Disease
Baquero Duarte, Katherine Andrea ULiege; Guldenmund, Pieter; Rouillard, Maud ULiege et al

Poster (2017, June 29)

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See detailThe dark matter disk: a viable explanation of the cosmic positron excess
Laletin, Maxim ULiege

Poster (2017, June 29)

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See detailAssessment of AquaCrop for maize and winter wheat using satellite derived fCover data
Mohamed Sallah, Abdoul-Hamid ULiege; Wellens, Joost ULiege

in 19th International Workshop on the Analysis of Multitemporal Remote Sensing Images (2017, June 29)

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See detailThe Politics of Zoning: Making Risks (In)visible in Disasters
Hasegawa, Reiko ULiege

Scientific conference (2017, June 29)

Zoning or hazard mapping exercise is often utilized by policymakers and public authorities to manage disaster risks. This exercise is only possible when potential risks have already been identified ... [more ▼]

Zoning or hazard mapping exercise is often utilized by policymakers and public authorities to manage disaster risks. This exercise is only possible when potential risks have already been identified, quantified and assessed by scientific experts at the outset. In other words, unidentified or unrecognized risks will not appear on the map, hence become invisible from administrators and the public. As Ulrich Beck (2008) described, “so long as risks are not recognized scientifically, they do not exist – at least not legally, medically, technologically, or socially, and thus they are not prevented, treated or compensated for”. This paper examines the role of expert institutions and authorities in defining, thus making (in)visible, risks through zoning/mapping exercise prior to and in the aftermath of disasters. This map, once established, forms the legitimate base and functions as the authority to categorize citizens into different status and its associated rights. The paper attempts to deconstruct this transformation process of hazards into risks, the territorialisation of risks via mapping, whereby matters that are scientifically uncertain or intangible would be made circumscribable both spatially and temporally. Our paper uses two case studies, one on evacuation zones after the Fukushima nuclear disaster and the other on hazard mapping prior to volcano eruptions in the Lesser Antilles, to illustrate how this political and administrative tool of zoning reifies hazards, thus making any disaster risks appear “manageable” and controllable by the authorities, and results in creating de facto different categories of affected populations, which triggers tension and division within the communities as well as in the scientific community. We also examine the role of independent experts and citizen mobilisations in challenging these zoning policies and contesting the management of territorialised risks. [less ▲]

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See detailEvaluation des enseignements par les étudiants :  évaluer pour évoluer
Detroz, Pascal ULiege

Scientific conference (2017, June 29)

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See detailDe la caricature à la bande dessinée, et retour : enjeux poétiques et médiatiques d’une affinité (1830-1890)
Stienon, Valérie ULiege

Conference (2017, June 29)

Dans quelle mesure la caricature, avec sa créativité graphique et les sociabilités artistiques et journalistiques sur lesquelles elle repose, a-t-elle constitué un paramètre décisif dans l’émergence de ... [more ▼]

Dans quelle mesure la caricature, avec sa créativité graphique et les sociabilités artistiques et journalistiques sur lesquelles elle repose, a-t-elle constitué un paramètre décisif dans l’émergence de l’art séquentiel au XIXe siècle ? La bande dessinée et la caricature ne sont pas seulement deux langages qui s’accommodent l’un à l’autre sur des supports partagés, en journal et en album, mais aussi des formes d’expression résultant de conditions techniques de production du texte-image, de réseaux éditoriaux croisés et d’une inscription dans l’actualité socioculturelle. On sait l’importance de l’équipe Aubert, pionnière de la caricature de presse, dans la reprise de l’œuvre de Töpffer via la collection des Jabots. Il reste à comprendre pourquoi certains caricaturistes ont initié l’art séquentiel sans l’affirmer comme tel (cas de J.J. Grandville) et comment la bande dessinée s’est approprié spécifiquement la pratique de la charge à mesure qu’elle trouvait son propre développement (voir notamment l’œuvre de Christophe). Centrée sur la production de la période 1830-1890, la communication propose d’examiner la culture matérielle qui détermine les diverses réorganisations du dispositif unissant la vignette à la légende, et d’étudier sous cet angle le triple rapport à l’actualité, à la sérialité et à l’humour qui anime conjointement la caricature et la bande dessinée. [less ▲]

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See detailA Discussion on the Advancement of Blade Tip Timing Data Processing
Kharyton, Vsevolod; Dimitriadis, Grigorios ULiege; Defise, Colin

in Proceedings of the Turbomachinery Technical Conference & Exposition, TURBO EXPO 2017 (2017, June 29)

The Blade Tip Timing method (BTT) is a well-known approach permitting individual blade vibration behavior characterization. The technique is becoming increasingly popular among turbomachinery vibration ... [more ▼]

The Blade Tip Timing method (BTT) is a well-known approach permitting individual blade vibration behavior characterization. The technique is becoming increasingly popular among turbomachinery vibration specialists. Its advantages include its non-intrusive nature and its capability of being used for long-term monitoring, both in on-line and off-line analysis. However, the main drawback of BTT is frequency aliasing. Frequency aliasing effects in tip timing can be reduced by means of the application of different methods from digital signal analysis that can exploit the non-uniform nature of the data sampled by BTT. This non-uniformity is due to the fact that an optimization of the circumferential distribution of BTT probes is usually required in order to improve the data quality for targeted modes of blade vibration and/or orders of excitation. The BTT data analysis methods considered in this study are the non-uniform Fourier transform, the minimum variance spectrum estimator approach, a multi-channel technique using in-between samples interpolation, the Lombe-Scargle periodogram and an iterative variable threshold procedure. These methods will be applied to measured data representing quite a large scope of events occurring during gas-turbine compressor operation, e.g. synchronous engine order resonance crossing, rotating stall, suspected limit-cycle oscillations. Finally, the frequency estimates obtained from all these methods will be summarized. [less ▲]

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See detailInfrastructures in the Making: The Case of a Public Broadcasting Operator
Jemine, Grégory ULiege; Pichault, François ULiege; Dubois, Christophe ULiege

Conference (2017, June 29)

This contribution explores how actors redefine infrastructures through an analysis of a project of “modernisation” in the making. Nowadays several companies undertake serious reflexions about their work ... [more ▼]

This contribution explores how actors redefine infrastructures through an analysis of a project of “modernisation” in the making. Nowadays several companies undertake serious reflexions about their work environments, tools and practices according to the “Bricks”, “Bytes” and “Behaviours” motto (De Leede, 2017). Relying on digital solutions they aim to enhance more flexible work practices in time and space. For that purpose various strategic and operational actors contribute actively to foreseeing the future of both facility, technological and social infrastructures. By means of adjustment mechanisms such as coordination meetings and alignment speeches, the actors take various actions in order to ensure the continuity of the organisation; they perform what Ribes and Finholt named the “Long Now”, an ongoing work to generate a “sustainable future” (2009, p. 377). Our interest lies in exploring simultaneously the incremental deconstruction of the existing infrastructures and the progressive construction of the forthcoming work environment. This innovation process may be seized by studying successive waves of problematisation using the actor-network theory. In the perspective of the ANT, an organisation is always a precarious agency made of both people and artefacts (Latour, 2005). Material issues, technological opportunities and constraints as well as power games emerge through the analysis of “controversies” which make parts of the infrastructures noticeable and subject to discussion and negotiation. Those controversies evolve through time, revealing various “range of visibilities” of people and things at different times in the process (Larkin, 2013, p. 336). Our research shows how actors simultaneously make sense of the existing infrastructure while enacting its future developments. We point out how the actors themselves perceive, describe and draw on the infrastructure in order to make sense of the strategic objectives, to conduct the change project and to maintain their institution. We shed light on the process of redefining and reshaping the infrastructure itself through controversies and adjustments. [less ▲]

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See detailPotato monitoring in Belgium with "watchITgrow"
Piccard, Isabelle; Gobin, Anne; Wellens, Joost ULiege et al

in 19th International Workshop on the Analysis of Multitemporal Remote Sensing Images (2017, June 29)

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See detail"Exploring Experiences of Inequality in European Urban Centers: Towards an Intersectional and Transnational Approach."
Vivas Romero, Maria ULiege; Ramos, Cristina

Conference (2017, June 28)

What strategies do migrants living in European cities use to challenge inequalities in access to healthcare, participation in the labor market and the creation of social support networks? The papers in ... [more ▼]

What strategies do migrants living in European cities use to challenge inequalities in access to healthcare, participation in the labor market and the creation of social support networks? The papers in this panel aim to respond to this question by drawing from transnational and intersectional approaches conceptualizing inequalities as sets of relationships between people and broader structures in which interactions generate better opportunity for some more than for others (Tilly, 2000). Panel participants consider that these interactions and the benefits that can be obtained through migration are affected by various social categories such as gender, class, sexual identity, transnational connections, and citizenship. Intersectional approaches allow to examine how these axes of inequality (Crenshaw, 1989; Anthias, 2001) simultaneously affect migration outcomes and also how they operate differently according to the geographical space in which they develop: origin and host societies as well as transnationally. Nonetheless, the papers presented in this panel will also emphasize migrants’ agency to resist or conform to the inequalities they face. Overall, this panel aims to contribute to the study of migration and inequality at the conceptual and methodological levels. At the theoretical level, the panel will build on new debates on the reproduction of intersectional inequalities in transnational settings (Faist, 2016, Amelina, 2017). At the methodological level, all paper presenters have use multi-sited ethnographic methods (working in cities such as Madrid, London, Milan, Brussels and Frankfurt) and will therefore use the panel as an opportunity to discuss the strengths and weaknesses of such method. [less ▲]

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See detailThermal history modelling to understand microstructures observed in repair technology of Ti-6Al-4V
Tomé Jardin, Ruben Antonio ULiege; Tchuindjang, Jérôme Tchoufack ULiege; Paydas, Hakan ULiege et al

Conference (2017, June 28)

Study of laser cladding as a possible technology to repair Ti-6Al-4V. Development of a FEM thermal to predict microstructure.

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See detailAn integrated logistics decision support model for city logistics
Limbourg, Sabine ULiege

Scientific conference (2017, June 28)

Today, more than 50% of the world's population lives in cities; the urban population is projected to reach 85% by 2100. Mainly due to urbanization and e-commerce, the demand for urban freight transport ... [more ▼]

Today, more than 50% of the world's population lives in cities; the urban population is projected to reach 85% by 2100. Mainly due to urbanization and e-commerce, the demand for urban freight transport (both forward flows and reverse flows) is clearly growing. But, transport is also responsible for a large share of urban air pollution as well as noise nuisance. Thus, an integrated logistics system to optimize transport network and service design, as well as vehicles routing of a variety of modes has to be developed. The objective is to determine how to efficiently move freight by means of these services and vehicles, while reducing negative environmental impacts. The topic includes research questions related to the demand to be serviced, the type and number of facilities needed to store and consolidate freight, the better utilization of vehicle capacity (fill rate and fewer empty trips: on average, 25% of goods vehicles in Europe run empty) and the reduction of energy consumption. [less ▲]

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See detailFrom internal experts to external interlocutors? EU agencies and procedures assessing the equivalence of third country legal rules with EU regulatory standards
Van Cleynenbreugel, Pieter ULiege

Scientific conference (2017, June 28)

this paper will offer an overview of procedures allowing EU agencies to determine the equivalence of third country regulatory regimes and conceptualise the accountability challenges they pose. Proceeding ... [more ▼]

this paper will offer an overview of procedures allowing EU agencies to determine the equivalence of third country regulatory regimes and conceptualise the accountability challenges they pose. Proceeding in three parts, the first part will identify and classify the different third country equivalence procedures in place. Analysing the legal basis for agency intervention and the specific powers granted to the respective agencies in that respect, this part will allow to develop a topology of two different equivalence roles conferred on EU agencies. Building upon this descriptive analysis, the second part will identify two accountability challenges associated with each of the identified third country equivalence procedure categories. Seeking to overcome those challenges, the third part of the paper will make four pointed suggestions aimed at recognising explicitly and in a more centralised way the external action powers conferred on EU agencies. Doing so would at the very least allow better to tailor modifications to the external action frameworks against the background of which existing equivalence procedures currently already implicitly operate. [less ▲]

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