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See detailIrreversible dynamics of the phase boundary in U(Ru(0.96)Rh(0.04))(2)Si(2) and implications for ordering
Silhanek, Alejandro ULiege; Jaime, M.; Harrison, N. et al

in Physical Review Letters (2006), 96(13),

We report measurements and analysis of the specific heat and magnetocaloric effect-induced temperature changes at the phase boundary into the single magnetic field-induced phase (phase II) of U(Ru(0.96)Rh ... [more ▼]

We report measurements and analysis of the specific heat and magnetocaloric effect-induced temperature changes at the phase boundary into the single magnetic field-induced phase (phase II) of U(Ru(0.96)Rh(0.04))(2)Si(2), which yield irreversible properties similar to those at the valence transition of Yb(1-x)Y(x)InCu(4). To explain these similarities, we propose a bootstrap mechanism by which lattice parameter changes caused by an electric quadrupolar order parameter within phase II become coupled to the 5f-electron hybridization, giving rise to a valence change at the transition. [less ▲]

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See detailIrreversible magnetization under rotating fields and lock-in effect on a ErBa2Cu3O7-delta single crystal with columnar defects
Avila, M. A.; Civale, L.; Silhanek, Alejandro ULiege et al

in Physical Review. B : Condensed Matter (2001), 64(14),

We have measured the irreversible magnetization (M-i) of an ErBa2Cu3O7-delta single crystal with columnar defects (CD), using a technique based on sample rotation under a fixed magnetic field H. This ... [more ▼]

We have measured the irreversible magnetization (M-i) of an ErBa2Cu3O7-delta single crystal with columnar defects (CD), using a technique based on sample rotation under a fixed magnetic field H. This method is valid for samples whose magnetization vector remains perpendicular to the sample surface over a wide angle range-which is the case for platelets and thin films-and presents several advantages over measurements of M-L(H) loops at fixed angles. The resulting M-i(Theta) curves for several temperatures show a peak in the CD direction at high fields. At lower fields, a very well defined plateau indicative of the vortex lock-in to the CD develops. The H dependence of the lock-in angle phi (L) follows the H-1 theoretical prediction, while the temperature dependence is in agreement with entropic smearing effects corresponding to long range vortex-defects interactions. [less ▲]

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See detailIrreversible passive energy transfer in coupled oscillators with essential nonlinearity
Kerschen, Gaëtan ULiege; Lee, Young Sup; Vakakis, Alexander F. et al

in SIAM Journal on Applied Mathematics (2006), 66(2), 648-679

We study numerically and analytically the dynamics of passive energy transfer from a damped linear oscillator to an essentially nonlinear end attachment. This transfer is caused by either fundamental or ... [more ▼]

We study numerically and analytically the dynamics of passive energy transfer from a damped linear oscillator to an essentially nonlinear end attachment. This transfer is caused by either fundamental or subharmonic resonance capture, and in some cases is initiated by nonlinear beat phenomena. It is shown that, due to the essential nonlinearity, the end attachment is capable of passively absorbing broadband energy at both high and low frequencies, acting, in essence, as a passive broadband boundary controller. Complicated transitions in the damped dynamics can be interpreted based on the topological structure and bifurcations of the periodic solutions of the underlying undamped system. Moreover, complex resonance capture cascades are numerically encountered when we increase the number of degrees of freedom of the system. The ungrounded essentially nonlinear end attachment discussed in this work can find application in numerous practical settings, including vibration and shock isolation of structures, seismic isolation,. utter suppression, and packaging. [less ▲]

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See detailIrreversible passive TEF in the damped response of coupled oscillators with nonlinearity
Kerschen, Gaëtan ULiege; Lee, Young S.; Vakakis, Alexander F. et al

in ASME International Design Engineering Technical Conferences & Computers and Information in Engineering Conference, Long Beach, 2005 (2005, September)

We study, numerically and analytically the dynamics of passive energy transfer from a damped linear oscillator to an essentially nonlinear end attachment. This transfer is caused either by fundamental or ... [more ▼]

We study, numerically and analytically the dynamics of passive energy transfer from a damped linear oscillator to an essentially nonlinear end attachment. This transfer is caused either by fundamental or subharmonic resonance capture, and in some cases is initiated by nonlinear beat phenomena. It is shown that, due to the essential nonlinearity, the end attachment is capable of passively absorbing broadband energy both at high and low frequencies, acting, in essence, as a passive broadband boundary controller. Complicated transitions in the damped dynamics can be interpreted based on the topological structure and bifurcations of the periodic solutions of the underlying undamped system. Moreover, complex resonance capture cascades are numerically encountered when we increase the number of degrees of freedom of the system. The grounded, essentially nonlinear end attachment discussed in this work can find application in numerous practical settings, including vibration and shock isolation of structures, seismic isolation, flutter suppression and packaging. [less ▲]

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See detailIrrigated food systems in Maradi Republic of Niger: A comparison between operating accounts
Andres, Ludovic ULiege; Dambo, Lawali; Bode, Sambo et al

Conference (2016, October 07)

In Niger, most food systems are based on pluvial crops (millet, sorghum and cowpea). However, during the last decade, agricultural policy and technical and financial partners focused on increasing the ... [more ▼]

In Niger, most food systems are based on pluvial crops (millet, sorghum and cowpea). However, during the last decade, agricultural policy and technical and financial partners focused on increasing the productivity of irrigated food products. The region of Maradi, located in the Central-South of Niger, is an area traditionally dedicated to agriculture. Some parts of this region are particularly adapted for irrigation, especially the Goulbi of Kaba and the Goulbi of Maradi valleys. The goal of this study is to establish the socio-economic situation of the main irrigated food productions, based on the following indicators: (i) the crop management technics used; (ii) the results of the operating account; and (iii) the comparison between the village and the adoption of new technic (farmer field school). This paper is based on direct surveys conducted in three areas of the Maradi’s region: Soumarana (commune of Safo, department of Madarounfa); N’Yelwa (commune of Madarounfa, department of Madarounfa); Madarounfa (commune of Madarounfa, department of Guidan Roumdji). The software used is Minitab and Excel. The results highlight a good perspective for the irrigation system but this food system is conditioned by the petroleum price and some other input (fertilizer and seed). The operating accounts show that irrigation is a non-negligible income source, which increases the resilience of the farmers. [less ▲]

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See detailIrrigated food systems in Maradi, Republic of Niger: a comparison between operating accounts
Andres, Ludovic ULiege; Dambo, Sambo; Baboussouna, Awal et al

in Kovacevic, Dusan (Ed.) VII International Scientific Agriculture Symposium “AGROSYM 2016”, Jahorina, October 06-09, 2016 : book of proceedings (2016)

In Niger, most food systems are based on pluvial crops (millet, sorghum and cowpea).However, during the last decade, agricultural policy and technical and financial partners focused on increasing the ... [more ▼]

In Niger, most food systems are based on pluvial crops (millet, sorghum and cowpea).However, during the last decade, agricultural policy and technical and financial partners focused on increasing the productivity of irrigated food products. The region of Maradi, located in the Centre-South of Niger, is an area traditionally dedicated to agriculture. Some parts of this region are particularly adapted for irrigation, especially the Goulbi of Kaba and the Goulbi of Maradi valleys. The goal of this study is to establish the socio-economic situation of the main irrigated food productions, based on the following indicators: (i) the crop management technics used; (ii) the results of the operating account; and (iii) the comparison between the village and the adoption of new technic (farmer field school). This paper is based on direct surveys conducted in three areas of the Maradi’s region: Soumarana (commune of Safo, department of Madarounfa); N’Yelwa (commune of Madarounfa, department of Madarounfa); Madarounfa (commune of Madarounfa, department of Guidan Roumdji). The software used is Minitab and Excel. The results highlighta good perspective for the irrigation system but this food system is conditioned by the petroleum price and some other input (fertilizer and seed). The operating accounts show that irrigation is a non-negligible income source, which increases the resilience of the farmers. [less ▲]

Detailed reference viewed: 52 (10 ULiège)
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See detailIrrigation avec les eaux usées traitées : manuel d'utilisation.
Bazza, M.; Xanthoulis, Dimitri ULiege

Conference (2003, September)

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See detailL’irrigation de complément à partir de petits bassins individuels : Synthèse des travaux réalisés au Burkina Faso
Barbier, Bruno; Zongo, Bétéo ULiege; Dugué, Patrice et al

in AGRIDAPE (2015)

Les petits bassins de cent à trois cent mètre-cubes collectent de l’eau de ruissellement et la stockent pendant quelques semaines afin de pouvoir irriguer les cultures lors des poches de sécheresses ... [more ▼]

Les petits bassins de cent à trois cent mètre-cubes collectent de l’eau de ruissellement et la stockent pendant quelques semaines afin de pouvoir irriguer les cultures lors des poches de sécheresses durant la saison des pluies. C’est une pratique ancienne en Asie, mais encore très peu répandue en zone soudanienne et sahélienne d’Afrique de l’Ouest. Elle permettrait de soutenir la production pluviale et sécuriser le revenu des agriculteurs familiaux soumis à une très grande variabilité des pluies. Mais, son coût et l’insuffisance de sensibilisation constitue les contrainte majeures à sa vulgarisation. Les actions de formation et d’information des paysans restent prioritaires en vue d’améliorer l’adoption de cette pratique. [less ▲]

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See detailIrrigation Development Support Program - Agricultural water management in Burkina Faso
Traoré, Farid; Wellens, Joost ULiege; Tychon, Bernard ULiege et al

Poster (2015, October)

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See detailIrritation cutanee et vitesse de propagation d'ondes ultrasonores.
Uhoda, Emmanuelle ULiege; Pierard, Gérald ULiege

in International Journal of Cosmetic Science (2003), 25(1-2), 31-5

Cutaneous irritation is a stereotyped response of the skin to any physical or chemical insult. Its main manifestations encompass inflammatory erythema and an alteration of the cutaneous microrelief ... [more ▼]

Cutaneous irritation is a stereotyped response of the skin to any physical or chemical insult. Its main manifestations encompass inflammatory erythema and an alteration of the cutaneous microrelief showing increased roughness, dehydration and erratic desquamation. Several instrumental methods can indirectly assess the issues of cutaneous irritation on human stratum corneum. The aim of the present study was to measure the speed of propagation of ultrasound shear waves in the skin irritated by anionic surfactants. The study was performed in 25 healthy subjects of both sexes. Occlusive patches of a 10% solution of anionic surfactants were applied to a forearm of each volunteer. The other forearm served as an untreated control site. Patches remained in place for 24 h. Three hours later, another patch was placed again for 21 h. Resonance running time measurements (RRTM) of the ultrasound shear wave were performed using a Reviscometer((R)) RVM 600. Measurements were performed at entry in the study and 2 days after removing the second patch. Desquamative xerosis was obvious at the sites patched with the surfactant solution. RRTM values were significantly (P < 0.0001) lower than those at the control site. Hence, the speed of propagation of ultrasound shear waves was shown to be increased at an irritated site compared to an intact site. In conclusion, this study shows that the propagation speed of ultrasounds is influenced by the skin surface nature, being considerably increased in skin altered by surfactants. [less ▲]

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See detailIrvin Yalom : satire et thérapie
Saint-Amand, Denis ULiege

Article for general public (2010)

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See detailIs "translational research" reshaping health policy ?
Fallon, Catherine ULiege

Conference (2012, July 08)

Biomedical research is an area of fast evolving development. Although biomedical research occurs in internationally nested research laboratories, application development occurs in local settings, such as ... [more ▼]

Biomedical research is an area of fast evolving development. Although biomedical research occurs in internationally nested research laboratories, application development occurs in local settings, such as hospitals, which are central instruments for health policies. Much translation work occurs to build new forms of cooperation between biomedical researchers and medical doctors. The first group works in an international competitive environment, acting as research entrepreneurs with connection to the pharmaceutical industry in the logics of "open innovation". Members of the second group are embedded in hospital systems, within a web of constrains, being accountable as well to their patients as to their managers, and to their professional constrains which are most of the time defined within specific institutions at national level, in close relation to public health authorities. These links at micro-meso-macro levels between medics and their environment are put under constrains by biomedical innovations (as was shown in Europe during the controversy around the breast cancer products from Myriad Genetics). In order to organise new forms of cooperation and to dismantle frontiers between the "bench world" and the "bed world", a new concept was put at the fore : "translational research" which is supporting new forms of cooperation "from bench to bed" with all associated partners, ensuring enrolment of the individual patient and the policy makers. Starting with the presentation of the new science production regime in French speaking Belgium, the paper proposes to deconstruct the conditions of emergence of the new instruments of science production in biomedical research to understand institutional reorganisation and new power balances. [less ▲]

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See detailIs 3 '-deoxy-3 '-[F-18] fluorothymidine ([F-18]-FLT) the next tracer for routine clinical PET after R [F-18]-FDG?
Couturier, Olivier; Léost, Françoise; Campone, Mario et al

in Bulletin du Cancer (2005), 92(9), 789-798

Positron emission tomography (PET) with {F-18}-FDG is nowfirmly established as a clinical tool in oncology. Its applications are however limited in some indications, due to the lack of specificity of its ... [more ▼]

Positron emission tomography (PET) with {F-18}-FDG is nowfirmly established as a clinical tool in oncology. Its applications are however limited in some indications, due to the lack of specificity of its uptake mechanism for tumors, or the low avidity of some cancer types such as prostate. Alternative tracers are thus being developed, in order to fill up this void. Proliferation as a biological target is particularly attractive in cancer imaging. From that perspective, fluorothymidine ({F-18}-FLT or FLT) has generated a strong interest among the scientific community, especially since the radiosynthesis process has been improved and simplified, thus making possible to envision a routine use for the tracer. This article aims at summarizing the status of the current scientific data regarding FLT The uptake mechanism of FLT is well known, relying on the thymidine kinase 1 (TK1) enzymatic activity, and thus on DNA synthesis, Preclinical studies have shown a clear relationship between tracer accumulation and level of tumor proliferation, even though DNA salvage pathwayss intervene in the process and may complicate the interpretation of the results. Several clinical studies suggest a good specificity for tumor, albeit with a lower sensitivity than with FDG. In all likelihood however, the future of FLT lies in the evaluation of antitumor response and possibly the pretherapeutic prognostic characterization, rather than in the diagnosis and staging of malignancies. Although the scientific data regarding this issue remain limited, initial results are encouraging. Further significant work remains to he done in order to fully assess the clinical performances of the tracer, on the one hand, and to determine its place relative to FDG and other emerging tracers, on the other hand. Until these studies are completed, FLT should he considered as a promising tracer, hut remaining at an experimental stage of its development. [less ▲]

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See detailIs 5-Hydroxytryptamine (serotonin) involved in the pathogenesis of canine idiopathic pulmonary fibrosis ?
Krafft, Emilie ULiege; Roels, Elodie ULiege; Laurila, HP et al

Poster (2014, September 20)

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See detailIs 5-Hydroxytryptamine (serotonin) involved in the pathogenesis of idiopathic pulmonary fibrosis in dogs ?
Krafft, Emilie ULiege; Roels, Elodie ULiege; Laurila et al

in Proceedings of the 23th ECVIM Meeting (2013, September)

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See detailIs a low-mass top quark ruled out?
Cudell, Jean-René ULiege; Halzen, F.; He, X. G. et al

in Physics Letters B (1987), 196

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See detailIs a Memoryless Motion Detection Truly Relevant for Background Generation with LaBGen?
Laugraud, Benjamin ULiege; Van Droogenbroeck, Marc ULiege

in Advanced Concepts for Intelligent Vision Systems (2017, September)

The stationary background generation problem consists in generating a unique image representing the stationary background of a given video sequence. The LaBGen background generation method combines a ... [more ▼]

The stationary background generation problem consists in generating a unique image representing the stationary background of a given video sequence. The LaBGen background generation method combines a pixel-wise median filter and a patch selection mechanism based on a motion detection performed by a background subtraction algorithm. In our previous works related to LaBGen, we have shown that, surprisingly, the frame difference algorithm provides the most effective motion detection on average. Compared to other background subtraction algorithms, it detects motion between two frames without relying on additional past frames, and is therefore memoryless. In this paper, we experimentally check whether the memoryless property is truly relevant for LaBGen, and whether the effective motion detection provided by the frame difference is not an isolated case. For this purpose, we introduce LaBGen-OF, a variant of LaBGen leverages memoryless dense optical flow algorithms for motion detection. Our experiments show that using a memoryless motion detector is an adequate choice for our background generation framework, and that LaBGen-OF outperforms LaBGen on the SBMnet dataset. We further provide an open-source C++ implementation of both methods at http://www.telecom.ulg.ac.be/labgen. [less ▲]

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See detailIs a new definition of intermodal transport interesting for transferring flows from road to more environmentally friendly modes?
Mostert, Martine ULiege; Limbourg, Sabine ULiege; Caris, An

Conference (2017, July)

Road remains the most used mode in Europe. Even if it is appreciated for its responsiveness, flexibility, and quickness, road transport is however responsible for negative impacts on its environment like ... [more ▼]

Road remains the most used mode in Europe. Even if it is appreciated for its responsiveness, flexibility, and quickness, road transport is however responsible for negative impacts on its environment like air pollution or climate change. Intermodal freight transport i.e. the transportation of goods using two or more modes of transport, in the same loading unit, without handling of the goods themselves is identified by the European Commission as an interesting solution for limiting the negative impacts of transport. In the classical conception of intermodal transport, pre- and post-haulage travels are supposed to be short, and to be performed by road transport, whereas the long-haul travel is done using rail or inland waterways (IWW). The objective of this study is to determine the impact on intermodal attractiveness of allowing other combinations of modes than the classical road-rail/IWW-road combination, during an intermodal travel. The goal is to determine the flow distribution of goods between direct transportation by road, rail or IWW, and any combination of these modes using intermodal transport. The novelty consists in taking into account three modes of transport in a mixed integer programming model, and to allow the transfer from any mode to any other at intermodal terminals where these modes coexist. For testing the hypothesis of intermodal transport attractiveness on medium to long distance, the model is applied to experimental data at the European level. [less ▲]

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