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Peer Reviewed
See detailDynamic multilevel filtering for real-time estimation of electric power systems
Mallieu, Didier; Van Cutsem, Thierry ULg; Rousseaux, Patricia ULg et al

in Control, Theory and Advanced Technology (1986), 2(2), 255-272

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See detailA dynamic neighbourhood discovery protocol for active overlay networks
Martin, Sylvain ULg; Leduc, Guy ULg

in Lecture Notes in Computer Science (2004), 2982

d-RADAR(1) is a neighbourhood discovery protocol for overlay network environments designed for (but not limited to) active network overlays. The core of the algorithm is an expanding ring-search based on ... [more ▼]

d-RADAR(1) is a neighbourhood discovery protocol for overlay network environments designed for (but not limited to) active network overlays. The core of the algorithm is an expanding ring-search based on the IP routing table content augmented with traffic-based and dynamic refreshing techniques that allows it to react to virtual topology changes (nodes joining/leaving the overlay) as well as IP topology changes (broken and repaired link, route changes and moving nodes). This paper presents how the protocol detects overlay candidate nodes using probing capsules and the algorithms needed to select neighbours among the candidates. We also show how d-RADAR keeps the neighbouring table up to date and learns topology changes while keeping a low discovery and refresh overhead. A short summary of simulations carried out with our active network simulator illustrates how these algorithms actually behave. [less ▲]

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See detailDynamic Nucleocytoplasmic Shuttling of an Arabidopsis SR Splicing Factor: Role of the RNA-Binding Domains
Rausin, Glwadys ULg; Tillemans, Vinciane ULg; Stankovic, Nancy ULg et al

in Plant Physiology (2010), 153

Serine/arginine-rich (SR) proteins are essential nuclear-localized splicing factors. We have investigated the dynamic subcellular distribution of the Arabidopsis (Arabidopsis thaliana) RSZp22 protein, a ... [more ▼]

Serine/arginine-rich (SR) proteins are essential nuclear-localized splicing factors. We have investigated the dynamic subcellular distribution of the Arabidopsis (Arabidopsis thaliana) RSZp22 protein, a homolog of the human 9G8 SR factor. Little is known about the determinants underlying the control of plant SR protein dynamics, and so far most studies relied on ectopic transient overexpression. Here, we provide a detailed analysis of the RSZp22 expression profile and describe its nucleocytoplasmic shuttling properties in specific cell types. Comparison of transient ectopic- and stable tissue-specific expression highlights the advantages of both approaches for nuclear protein dynamic studies. By site-directed mutagenesis of RSZp22 RNA-binding sequences, we show that functional RNA recognition motif RNP1 and zinc-knuckle are dispensable for the exclusive protein nuclear localization and speckle-like distribution. Fluorescence resonance energy transfer imaging also revealed that these motifs are implicated in RSZp22 molecular interactions. Furthermore, the RNA-binding motif mutants are defective for their export through the CRM1/XPO1/Exportin-1 receptor pathway but retain nucleocytoplasmic mobility. Moreover, our data suggest that CRM1 is a putative export receptor for mRNPs in plants. [less ▲]

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See detailDynamic of agricultural innovations diffusion in Burkina Faso
Zongo, Bétéo ULg; Diarra, Abdoulaye; Barbier, Bruno et al

in Field, Christopher; Jouzel, Jean; Le Treut, Hervé (Eds.) Our ender common climate future change, Abstract Book (2015, July)

This study highlights the factors determining the spread of agricultural innovations for water harvesting since the drastic effects of drought 70s in Burkina Faso. These innovations include zaï, stone ... [more ▼]

This study highlights the factors determining the spread of agricultural innovations for water harvesting since the drastic effects of drought 70s in Burkina Faso. These innovations include zaï, stone bunds, bunds land, half-moons, mulching and grass strips. A survey of 629 farmers revealed that farmers fall into five categories which are the pioneer, early, latecomer, late and non-adopters. After four decades of diffusion (1974-2013) the rate is estimated at 69.3% for stone bunds, 49.1% for zaï, 26.2% for grass strips and less than 10% for half-moons, bunds land and mulching. The multinomial logit model showed that the climatic conditions in the Sahel zone, age and perception of increased dry spells of farm households promoted the spread of these innovations. However, the low level of organization and access to agricultural services were the major constraints to their adoption. [less ▲]

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See detailThe dynamic of flexible bodies
Fraeijs de Veubeke, Baudouin ULg

Report (1976)

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See detailDynamic of seed dispersal by large frugivores in a forest-savanna mosaic subject to anthropic pressure in Western D.R. Congo
Trolliet, Franck ULg; Serckx, Adeline ULg; Huynen, Marie-Claude ULg et al

Poster (2013, April 05)

The Western Congolian forest-savanna mosaic is an ecotone subject to anthropogenic as well as natural fragmentation. Its forests have thus a considerable proportion of edges. This vegetation structure is ... [more ▼]

The Western Congolian forest-savanna mosaic is an ecotone subject to anthropogenic as well as natural fragmentation. Its forests have thus a considerable proportion of edges. This vegetation structure is likely to impact animal and plant communities and its dynamics such as animal mediated seed dispersal. Synergetically, activities such as bush meat hunting deplete large frugivores populations and thus decrease recruitment potential of the plants they disperse. Indeed, zoochory is known to be of great importance for tropical forests and a number of studies proved that large-seeded tree species closely depend on large frugivores for their regeneration. In such a context, we aim to understand how forest edges affect the dynamics of seed dispersal. More precisely, we wonder if the interactions between large seeds and their dispersers and predators are affected when closer to edges and how this can impact plant regeneration capacity. Also, we wonder if the dispersal and regeneration of large-seeded tree species depend on a few disproportionally important frugivores species. Bonobos, Pan paniscus, are among the largest frugivores left in the area and thus likely to be disproportionally important seed dispersers, though, their role as seed dispersers has yet been little investigated. We thus focus on the qualitative role for seed dispersal of the potentially keystone and umbrella ape species, the bonobo. To answer those questions, we study the main steps characteristics of large-seeded tree species regeneration process; namely quantitative seed dispersal, seed deposition pattern, germination capacity after transit in frugivore’s gut and, seed and seedling fate. By studying five different tree species at varying distances from forest edge, we aim to drive an inter-species comparison and to highlight the effect of forest edge on the regeneration process. We first quantify the seed production for each tree species and then evaluate the quantitative capacity of seed dispersal. By combining direct focal observations and camera trapping, we are able to highlight variations in composition of dispersers community and their respective contribution to seed dispersal. A literature review on each disperser species’ seed retention time and habitat use will allow the computation of the seed dispersal kernels. We will also evaluate the effect of seed ingestion by the bonobo on its germination capacity: seeds will be collected from dung to evaluate the effect of seed ingestion on the rate and velocity of germination. Finally, we will study the predation pressure exerted on dispersed and non-dispersed seeds and seedlings by setting up two sets of seeds below the canopy of parent trees and away from any conspecific trees. One set will be dispersed unprotected to seed predators; another one will be enclosed in a cage and permit seeds to germinate, allowing us to evaluate the herbivores pressure on seedlings. [less ▲]

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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 detailThe dynamic pathways of agrarian change in the Red River Delta of Vietnam
Nguyen Thi Minh Khué, ULg; Nguyen Thi, Dien; Lebailly, Philippe ULg

in Vietnam National University of Agriculture (VNUA); Académie de Recherche et d'Enseignement Supérieur (ARES) (Eds.) Proceedings International Conference "Agriculture Development in the Context of International Integration: Opportunities and Challenges". Vietnam National University of Agriculture, December 7-8, 2016, Hanoi, Vietnam (2016)

Even though agricultural production has not been the main source of income for rural households in Red River Delta, yet farming remains an important livelihood and security for many rural people. The ... [more ▼]

Even though agricultural production has not been the main source of income for rural households in Red River Delta, yet farming remains an important livelihood and security for many rural people. The empirical findings from fieldwork in a village in the Red River Delta of Vietnam show how dependence on agriculture is determined by family context, including land, education and job of household members, their gender and age. Most educated young people have successfully found employment opportunities outside in the village as migratory wage labour, and have capacity to attain higher social status and become rural entrepreneurs. While less educated and older villagers consider agriculture as a more favorable alternative and valuable security. Besides, maintenance agricultural production at reasonable level and return to traditional cultivation is also considered as a rural household strategy coping with food security in industrialization and rural-urban linkage. Diverse and special extended livelihoods are contributed by historical, cultural and economic specificities which are conditioned for rural transformation. [less ▲]

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See detailDynamic peer-to-peer competition
Caram, L. F.; Caiafa, C. F.; Proto, A. N. et al

in Physica A: Statistical Mechanics and its Applications (2010), 389(13), 2628-2636

The dynamic behavior of a multiagent system in which the agent size si is variable it is studied along a Lotka-Volterra approach. The agent size has hereby the meaning of the fraction of a given market ... [more ▼]

The dynamic behavior of a multiagent system in which the agent size si is variable it is studied along a Lotka-Volterra approach. The agent size has hereby the meaning of the fraction of a given market that an agent is able to capture (market share). A Lotka-Volterra system of equations for prey-predator problems is considered, the competition factor being related to the difference in size between the agents in a one-on-one competition. This mechanism introduces a natural self-organized dynamic competition among agents. In the competition factor, a parameter sigma is introduced for scaling the intensity of agent size similarity, which varies in each iteration cycle. The fixed points of this system are analytically found and their stability analyzed for small systems (with n = 5 agents). We have found that different scenarios are possible, from chaotic to non-chaotic motion with cluster formation as function of the a parameter and depending on the initial conditions imposed to the system. The present contribution aim is to show how a realistic though minimalist nonlinear dynamics model can be used to describe the market competition (companies, brokers, decision makers) among other opinion maker communities. (C) 2010 Elsevier B.V. All rights reserved. [less ▲]

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See detailDynamic Prediction of Energy Delivery Capacity of Power Networks : Unlocking the Value of Real-Time Measurements.
Schell, Peter; Jones, Lauren; Mack, Philippe et al

in Proceedings of the third IEEE PES Conference on Innovative Smart Grid Technologies (2012, January)

This paper describes recent advances in prediction software using advanced data-mining tools, and shows how this can significantly increase the operational value of the data gathered. These new tools ... [more ▼]

This paper describes recent advances in prediction software using advanced data-mining tools, and shows how this can significantly increase the operational value of the data gathered. These new tools allow for new operational procedures to be defined that increase the usages of the network without decreasing security of supply. We will use the example of dynamic line rating, i.e. determining the thermal rating of an overhead line based on real-time environmental parameters (temperature, wind speed & direction and solar radiation) to highlight how the use of numerical data-mining tools can help us reliably predict future behavior of power networks. [less ▲]

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See detailDynamic processes in sea ice captured by the temporal evolution of its biogeochemical
Zhou, Jiayun; Tison, Jean-Louis; Eicken, Hajo et al

in VLIZ Special Publication (2011), 48

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See detailDynamic properties of the transient network formed by telechelic ionomers studied by dynamic light scattering and dynamic mechanical analysis
Johannsson, Ragnar; Chassenieux, Christophe; Durand, Dominique et al

in Macromolecules (1995), 28(25), 8504-8510

Solutions of alpha,omega-sodium sulfonatopolyisoprene (alpha,omega NaPIPS) in toluene are studied using static and dynamic light scattering and dynamic mechanical analysis. At concentrations above 4 g/L ... [more ▼]

Solutions of alpha,omega-sodium sulfonatopolyisoprene (alpha,omega NaPIPS) in toluene are studied using static and dynamic light scattering and dynamic mechanical analysis. At concentrations above 4 g/L, which is well below the overlap concentration of the polymer chains (C*), a transient network is formed characterized by a plateau modulus at high frequencies and a relatively narrow viscoelastic relaxation time distribution. The intensity autocorrelation function of the transient network shows two relaxational modes: a relatively fast diffusional mode close to the co-operative diffusional mode of semidilute solutions of the unfunctionalized polymers and a slow broader mode which becomes independent of the scattering angle at a concentrations close to C*. The relation between this slow mode and the viscoelastic relaxation is discussed. Both the slow mode and the viscoelastic relaxation processes have an Arrhenius temperature dependence with the same activation energy, E(a) = 25 kJ/mol. [less ▲]

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See detailDYNAMIC PROTEOME ANALYSIS OF ANTERIOR MICE HIPPOCAMPUS
Jackers, Pascale ULg; Vafiadaki, Elizabeth; Arvanitis, D.A. et al

Poster (2010, September 07)

Neurodegeneration is a molecular process that occurs during several brain diseases (Parkinson, Alzheimer, Epilepsies). This process leads to the reorganization of synapses and neurons in the Central ... [more ▼]

Neurodegeneration is a molecular process that occurs during several brain diseases (Parkinson, Alzheimer, Epilepsies). This process leads to the reorganization of synapses and neurons in the Central Nervous System. The search for early medication to reduce neurodegeneration is a major challenge in Neuroscience. To this aim VALAPODYN, a European Commission-funded research network, develops functional genomics and proteomics related to the dynamics of molecular interaction networks (MIN). MIN modeling investigates protein-protein interactions and regulation networks. This study is established on scientific literature and on experimental data coming out of genomic and proteomic analyses. Experimental data are obtained thanks to a model of kainate inducing cell loss with focal epilepsy in mice hippocampi . This model permit the EU Consortium to get a transcriptome and proteome dynamic expression analysis conducted at 10 successive time-points during the first 24h after kainate induction. Proteome dynamic analysis is performed with total and fractionated proteins extracts. Obtained proteins are separated by two methods: (i) a classic method based on 2D-PAGE gel separation of these proteins; (ii) a method based on the 2D-HPLC liquid separation of digested peptides. When proteins are separated on 2D-PAGE, proteins spots are visualized thanks to 2 images analysis software’s using different mathematical algorithms. Proteins spots are picked and digested automatically using a spot picker and a recently acquired digester workstations. Mass spectrometry identification of digested peptides (2D PAGE MALDI-TOF/TOF and 2D-LC MS/MS) highlighted the modulation of the expression of 232 different proteins during the first 24h after kainate induction. The dynamic proteome analysis was performed thanks to complementary strategies to cover a large window of molecular events as a result of cellular loss induction. “User-friendly” documents were constructed to efficiently communicate proteome information. The obtained lists of proteins were extensively analysed with public databases (UniProtKB, NCBI, Pfam etc) to review interactions, biological functions, protein families with different isoforms and cellular-tissue localisation. We want also to emphasize that several proteins families showed multiple spots as a result of different isoforms. These isoforms are probably the consequence of natural chemical modifications. The study of these chemical modifications in the native conditions needs a dynamic analysis of the tri-dimensional structure and folding showed by these isoforms. This new study will permit to establish a link between proteomic, interactomic data and data issue from the structural biology. [less ▲]

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See detailDynamic proteomics of mice hippocampus to study apoptosis
Jackers, Pascale ULg; Bertrand, Virginie ULg; Vafiadaki, Elizabeth et al

Poster (2008, February 15)

Apoptosis or physiological programmed cell death is a molecular process observed during neurodegenerative diseases (Epilepsies, Alzheimer…). The neurodegeneration leads to the reorganization of synapses ... [more ▼]

Apoptosis or physiological programmed cell death is a molecular process observed during neurodegenerative diseases (Epilepsies, Alzheimer…). The neurodegeneration leads to the reorganization of synapses and neurons in the CNS. Consequently, searches for early medication are a major challenge in Neuroscience. To this aim, VALAPODYN, a European Commission funded research network, develops functional genomics and proteomics related to the dynamics of molecular interaction networks (MIN). MIN modeling investigates protein-protein interactions and regulation networks. Using a model of induced hippocampal sclerosis associated with focal epilepsy in the mouse, dynamic expression analyses are conducted at different time points. Hippocampal samples were subjected on 2D-DIGE analysis which allows quantification of cyanine labelled proteins. Biological variation analysis yields about 1500 protein spots. These spots include 34 protein spots to be differentially regulated. The distribution is consistent with the literature showing that CNS proteins are mainly composed of acidic and neutral proteins. Several proteins have multiple protein spots likely resulting from different isoforms. Spots of interest will be digested with proteases and analysed using MALDI/TOF-TOF. Total proteins mixture will also be submitted to ESI-MS after HPLC separation as a means of improving both protein and proteome coverage by using complementary instruments. [less ▲]

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See detailDynamic proteomics of mice hippocampus to study apoptosis
Jackers, Pascale ULg; Bertrand, Virginie ULg; Vafiadaki, Elizabeth et al

Poster (2007, September 04)

Apoptosis or physiological programmed cell death is a molecular process observed during neurodegenerative diseases (Epilepsies, Alzheimer…). The neurodegeneration leads to the reorganization of synapses ... [more ▼]

Apoptosis or physiological programmed cell death is a molecular process observed during neurodegenerative diseases (Epilepsies, Alzheimer…). The neurodegeneration leads to the reorganization of synapses and neurons in the CNS. Consequently, searches for early medication are a major challenge in Neuroscience. To this aim, VALAPODYN, a European Commission funded research network, develops functional genomics and proteomics related to the dynamics of molecular interaction networks (MIN). MIN modeling investigates protein-protein interactions and regulation networks. Using a model of induced hippocampal sclerosis associated with focal epilepsy in the mouse, dynamic expression analyses are conducted at different time points. Hippocampal samples were subjected on 2D-DIGE analysis which allows quantification of cyanine labelled proteins. Biological variation analysis yields about 1500 protein spots. These spots include 34 protein spots to be differentially regulated. The distribution is consistent with the literature showing that CNS proteins are mainly composed of acidic and neutral proteins. Several proteins have multiple protein spots likely resulting from different isoforms. Spots of interest will be digested with proteases and analysed using MALDI/TOF-TOF. Total proteins mixture will also be submitted to ESI-MS after HPLC separation as a means of improving both protein and proteome coverage by using complementary instruments. [less ▲]

Detailed reference viewed: 10 (5 ULg)
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See detailDynamic proteomics of mice hippocampus to study apoptosis
Jackers, Pascale ULg; Bertrand, Virginie ULg; Vafiadaki, Elizabeth et al

Poster (2008, May 30)

Detailed reference viewed: 8 (2 ULg)
Peer Reviewed
See detailDynamic Recrystallization during Zinc Rolling
Habraken, Anne ULg; Charles, J.-F.; Wegria, J. et al

in International Journal of Forming Processes (1998), 1

Detailed reference viewed: 121 (12 ULg)