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See detailDynamic of soil drying close to saturation: What can we learn from a comparison between X-ray computed microtomography and the evaporation method?
Parvin, Nargish ULg; Beckers, Eléonore ULg; Plougonven, Erwan ULg et al

in Geoderma (2017), 302

The soil water retention curve (SWRC) is a unique relationship between water content and soil water potential. SWRC in near saturation gives the dimension of soil macroporosity which plays an important ... [more ▼]

The soil water retention curve (SWRC) is a unique relationship between water content and soil water potential. SWRC in near saturation gives the dimension of soil macroporosity which plays an important role in water translocation into soil. Thus, the accurate measurement of SWRC is crucial. The aim of this study is to compare SWRC obtained through two different methods: X-ray computed microtomography (X-ray CT) and evaporation method by HYPROP device. Three different depths (0–10, 25–30 and 45–60 cm) are considered for soil sampling. The results showed significant differences in SWRC between the techniques. The SWRC from X-ray CT showed more volumetric water content at 25–30 cm (0.044) and 45–60 cm (0.024) than evaporation at saturation (0 kPa) in cases where the macroporosity was higher. Macropores may have connections with neighbouring pores of smaller sizes. Hence we assume that these pores can be observed through X-ray CT but cannot be evaluated by evaporation. As macropores with narrow opening do not evaporate at very low tension. These pores therefore got empty at relatively higher tension. Consequently, SWRC near saturation appeared rather flatter with the evaporation method where the X-ray CT presented deviation. Accordingly, interpretation of macro pores from SWRC through evaporation method would give comparatively smaller volume of macropores than they really are. Pore morphology and other hydraulic functions of soil, for example, mean connection surface of pores, hydraulic conductivity, and the efficiency of water conducting macropores also support the X-ray CT findings. [less ▲]

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See detailPasser à un SGB pour susciter l'appétit de changement et lutter contre l'inertie ?
Renaville, François ULg

Conference (2017, May 10)

En février 2015, les Bibliothèques de l'Université de Liège sont passées au système de gestion de bibliothèque Alma, moins de 10 ans après une migration vers Aleph et 2 ans après le lancement de la ... [more ▼]

En février 2015, les Bibliothèques de l'Université de Liège sont passées au système de gestion de bibliothèque Alma, moins de 10 ans après une migration vers Aleph et 2 ans après le lancement de la solution discovery Primo. Cette présentation balaye les moments clés du projet Alma, en mettant l'accent sur la composante organisationnelle, la gestion du changement, les attentes et espoirs suscités. [less ▲]

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See detailInnovative silage additives to reduce proteolysis in the silo
Herremans, Sophie ULg; Decruyenaere, Virginie; Beckers, Yves ULg et al

Poster (2017, May 10)

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See detailSmart-shoes self-powered by walking
Colson, Gérald ULg; Laurent, Philippe ULg; Bellier, Pierre ULg et al

Poster (2017, May 10)

Nowadays, electronic devices are more and more compact and can be integrated in nearly every object. One of the remaining challenges is to provide smarter ways to power those electronic devices. Because ... [more ▼]

Nowadays, electronic devices are more and more compact and can be integrated in nearly every object. One of the remaining challenges is to provide smarter ways to power those electronic devices. Because of the small amount of energy needed by the latest ultra-low power systems, energy harvesting from the environment becomes a viable solution to power them. In this work, we present the integration of an electronic device and an electrodynamic energy harvester (EH) in a shoe. The electronic device measures the acceleration along one axis at a sampling rate of 30 Hz and sends the data every second using a wireless link. The data are then collected by a gateway and processed to count the number of steps, calculate the contact time and the flying time of the foot. To perform this function, the device requires an average power of 951 μW which is provided by the EH. [less ▲]

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See detailEnergy product and magnetic properties of strontium hexagonal ferrite: experimental and theoretical investigation
Abraime, Brahim; Ait Tamerd, Mohamed; Mahmoud, Abdelfattah ULg et al

Conference (2017, May 10)

The interest toward hard magnetic materials increases in the last years. In order to have the best magnetic properties of these materials, researchers count on the efficiency of different synthesis ... [more ▼]

The interest toward hard magnetic materials increases in the last years. In order to have the best magnetic properties of these materials, researchers count on the efficiency of different synthesis methods. In permanent magnets application, ferrite materials possess a good place among the other magnet families. In permanent magnets field, the more important parameter that describes the magnetic strength of a magnet is the maximum energy product (BH)max. A strong permanent magnet has an important value of (BH)max. In this work, we will study the effect of annealing temperature on maximum energy product and other magnetic properties of Strontium hexaferrite SrFe12O19 synthesized using sol-gel autocombustion method, with different annealing temperatures, characterized using Thermogravimetric analysis (TGA), X-ray diffraction (XRD), scanning electron microscopy (SEM), Mössbauer spectroscopy (MS) and superconducting quantum interference device magnetometer (SQUID). Ab initio calculation for magnetic properties is also performed in order to compare it with low temperature experimental results. [less ▲]

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See detailCaractérisation des amidons de sorgho et de mil perlé cultivés dans le Sahara algérien
Boudries, Nadia ULg

Doctoral thesis (2017)

Starches of sorghum (Sorghum bicolor (L.) Moench) and pearl millet (Pennisetum glaucum (L.)) cultivated in Tidikelt (In Salah) and Ahaggar (Tamanrasset), were the subject of a characterization study. The ... [more ▼]

Starches of sorghum (Sorghum bicolor (L.) Moench) and pearl millet (Pennisetum glaucum (L.)) cultivated in Tidikelt (In Salah) and Ahaggar (Tamanrasset), were the subject of a characterization study. The approach consists of the isolation of starches, the determination of physico-chemical and functional properties and the study of enzymatic hydrolysis modification. The starches with a rate ranging from 63.1 to 66.8 % were isolated according to the alkaline method. The purity of the obtained starches is satisfactory (91.4-96.7 %).However the extraction yield remains average (59.1-61.2 %). The physical properties (color, shape and size of the granules), chemical composition (moisture, starch and amylose) and rheological properties (solubility, swelling power and viscosity) of the isolated starches were determined. Important results were obtained highlighting interesting functional properties of these starches. Indeed, the average diameter of native starches granules had reached 18 and 10µm for sorghum and pearl millet respectively. These values are lower than those of others regions cultivars and close to those of corn and cassava. The amylose content (23.0 and 27.1 %) revealed that the analyzed cereals are normal varieties. The analysis of viscosity showed a very high peak viscosity that is reached rapidly. The DSC analysis has revealed higher gelatinization temperatures, attributed to high maturity temperatures. The X-rays diffraction patterns show the type A characteristic of cereals and allowed deducing the relative degrees of cristallinity. The kinetic studies of hydrolysis showed that the sorghum and pearl millet starches present susceptibility for hydrolysis in presence of fungal, bacterial and human amylases. However, this susceptibility varies according to the treatment used with the integral grinding (flour) and to enzyme source. The experimental conditions allowing to enzymatic hydrolysis reactions of isolated starches to follow the Michaelis-Menten model were determined and kinetic constants (KM and Vmax) were calculated. The HPAEC-PAD profiles of oligosaccharides in sorghum starches hydrolysates were determinated for highlight the amylases activities. The study demonstrated the potential of sorghum and pearl millet starches and considers their applications and bioprocessing. [less ▲]

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See detailPlant oxylipins: structure-function relationship
Genva, Manon ULg; Andersson, Mats X.; Nasir, Mehmet Nail ULg et al

Conference (2017, May 09)

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See detailDécrets Présidentiels portant création du PNPS et nomination de son Directeur
Manzambi Kuwekita, Joseph ULg

Scientific conference (2017, May 09)

Social Protection refers to all mechanisms of (i) prevention, (ii) protection and collective as well as (iii) promotion or social rehabilitation for individuals and households to support social risks ... [more ▼]

Social Protection refers to all mechanisms of (i) prevention, (ii) protection and collective as well as (iii) promotion or social rehabilitation for individuals and households to support social risks. Social Protection in the DRC is not a recent concern. Well before independence, a series of initiatives and devices had been implemented by the Belgian kingdom. Upon its accession to independence, the DRC became a member of the ILO. More than 80% of the population of the DRC has no social protection coverage. To remedy this, the Congolese Government has implemented the PNPS (National program of support to Social Protection (PNPS) in November 2005, with 5 missions: (i) extend the coverage of social protection, (ii) improve the quality of social services, (iii) establish and maintain a system of coverage of health care, (iv) contribute to the work of reform with the appointed commission, (v) make effective social protection for all. The formulation of the National Social Protection policy is one of the assignments entrusted to the Council of the PNPS, which the Minister of social security is the President. The Secretariat of the Council of the PNPS is managed by its Director. The two presidential decrees here presented deal about (i) the creation of the PNPS and (ii) the appointment of its Director, both signed in November 24, 2005. [less ▲]

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See detailComprehensive Ion Mobility Calibration Strategies based on Synthetic Polymers
Haler, Jean ULg; Kune, Christopher ULg; Chirot, Fabien et al

Conference (2017, May 09)

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See detail"Sulla scia di Agnolo Bronzino, Alessandro Allori sodale di Benedetto Varchi. Un ritratto ‘misconosciuto’ del letterato e un suo sonetto inedito"
Geremicca, Antonio ULg

in LaRivista. Études culturelles italiennes Sorbonne Universités (2017), 5

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See detailParticipative Management as a Key Success Factor in Merger and Acquisition
Souply-Pierrard, Fernand; Robert, Jocelyne ULg

E-print/Working paper (2017)

In this working paper, we will examine in which way the participative management can be a key success factor in a context of organizational change. We tried to determine whether the use/implementation of ... [more ▼]

In this working paper, we will examine in which way the participative management can be a key success factor in a context of organizational change. We tried to determine whether the use/implementation of participative management and its tools is perceived as an increasing success factor of the mergers and acquisitions process. One of the interest of this study is to bring back a managerial aspect, nearly forgot in Europe but yet still relevant in Canada, that has proven is great interest within different studies over last decades and to apply the previous researches to a specific event in the life of a company, but also to a really particular context which is the one of a SME employing people with disabilities. To perform this research, we focused on the perception of participation, and its tools, that have workers and managers though a qualitative and a quantitative survey. The perspectives of this study open the way to more in depth researches in order to define audit processes and advises about the implementation of participative management (tools) to influence positively the probabilities of success for mergers and acquisitions. [less ▲]

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See detailValidation of a simplfied method for the crashworthiness of offshore wind turbine jackets using finite elements simulations
Pire, Timothée ULg; Echeverry Jaramillo, Sara ULg; Rigo, Philippe ULg et al

in Guedes Soares, Carlos; Garbatov, Yordan (Eds.) Progress in the Analysis and Design of Marine Structures (2017, May 08)

The work presented in this paper focuses on crashworthiness of jacket foundations used to support offshore wind turbines in moderately deep waters. In a previous research work, the authors have developed ... [more ▼]

The work presented in this paper focuses on crashworthiness of jacket foundations used to support offshore wind turbines in moderately deep waters. In a previous research work, the authors have developed a solver based on analytical formulations, derived from limit plastic analysis, to assess the damage of such foundations when impacted by a ship. The present paper describes the methodology followed to perform numerical validations of the theoretical developments, including a description of the finite element models, the computation hypotheses and the simulations performed using LS-DYNA code. Many parameters describing the collision scenario are investigated, namely the type, the mass, the initial velocity and the trajectory of the striking ship. Some comparisons between analytical and numerical results are finally shown. [less ▲]

Detailed reference viewed: 31 (3 ULg)