References of "2012"
     in
Bookmark and Share    
See detailEnsembles reconnaissables de rationnels
Charlier, Emilie ULg

Scientific conference (2012, April)

In this talk I will introduce the recognizable sets of rationals, following the formalism of Jeffrey Shallit. I will point out several open questions regarding this topic.

Detailed reference viewed: 10 (0 ULg)
Full Text
Peer Reviewed
See detailEl papel de los academicos en la sociedad del conocimiento
Jacquemain, Marc ULg

in Casas Guerrero, Rosalba; Carton de Grammont, Hubert (Eds.) Democracia, conocimiento y cultura (2012)

Los academicos en la sociedad del concocimiento tienen a la vez un papel de expertos y de ciudadanos. Su funcion en la sociedad del conocimiento supone que sus cualficaciones como expertos vengan en apoyo ... [more ▼]

Los academicos en la sociedad del concocimiento tienen a la vez un papel de expertos y de ciudadanos. Su funcion en la sociedad del conocimiento supone que sus cualficaciones como expertos vengan en apoyo al funcionamiento democratico de la sociedad lo que les impide actuar sencillamente como profesionales sinon tambien como actores democraticos. [less ▲]

Detailed reference viewed: 68 (3 ULg)
Full Text
See detailDynamique forestière et enrichissements forestiers. Site de Mbang. Rapport n° 8.
Doucet, Jean-Louis ULg; Amandé, Jean; Bracke, Charles et al

Report (2012)

Detailed reference viewed: 16 (0 ULg)
Full Text
See detailBriefe an Casanova
Roggendorf, Cécile de; Viehöver, Vera ULg

E-print/Working paper (2012)

Detailed reference viewed: 48 (1 ULg)
See detailLes dates des élections depuis 1830
Bouhon, Frédéric ULg

in Bouhon, Frédéric; Reuchamps, Min (Eds.) Les systèmes électoraux de la Belgique (2012)

Cette contribution constitue une annexe d'un ouvrage collectif sur les systèmes électoraux de la Belgique. Elle vise à présenter, sous la forme de tableaux, les dates des élections en Belgique à tous les ... [more ▼]

Cette contribution constitue une annexe d'un ouvrage collectif sur les systèmes électoraux de la Belgique. Elle vise à présenter, sous la forme de tableaux, les dates des élections en Belgique à tous les niveaux de pouvoir depuis 1830. [less ▲]

Detailed reference viewed: 62 (5 ULg)
Full Text
Peer Reviewed
See detailEffects of platelet-rich plasma on the healing of tendons: animal model
Kaux, Jean-François ULg; Drion, Pierre ULg; Colige, Alain ULg et al

in Biomedica 2012 (2012, April)

Introduction: Platelet-Rich Plasma (PRP) contains lot of growth factors which could enhance the healing process of different tissues. We aimed to determine if a single injection of PRP could improve the ... [more ▼]

Introduction: Platelet-Rich Plasma (PRP) contains lot of growth factors which could enhance the healing process of different tissues. We aimed to determine if a single injection of PRP could improve the cicatrisation of ruptured Achilles tendons of rats. Material and Methods: A 5mm defect was surgically made in the Achilles tendon of 120 rats. A few hours after surgery, 45 rats received a PRP or PBS injection in situ. After 5, 15 and 30 days, 20 rats of both groups were euthanized and 15 collected tendons were immediately submitted to a biomechanical tensile strength test until rupture using a “cryo-jaw” device. After, theses samples were used for transcriptomic analyses. Histological and biochemical analyses were performed on the five remained tendons in each group. Results: Tendons in the PRP group were more resistant to rupture at 15 and 30 days than those in the control group. The transverse area of tendons in the PRP group was significantly higher at day 5 and 15. The constraint was significantly increased in tendons of the PRP group in the late phase of the healing (day 30). Histological and immunohistological analysis showed an increased staining for fibrillar collagen at day 5 confirmed by a biochemical analysis showing an increased collagen concentration in the callus. The expression of tenomodulin, a tenocyte differentiation marker, was significantly higher in the PRP-treated tendons at day 5. No significant difference in terms of mRNA for type III collagen and matrix metalloproteinase 9 was observed at any time between the 2 groups. Conclusion: A single injection of PRP in sectioned Achilles tendon of rats few hours after surgery influences the early phase of tendons healing, resulting in an ultimate stronger mechanical resistance. [less ▲]

Detailed reference viewed: 104 (17 ULg)
Full Text
Peer Reviewed
See detailMapping error due to image geometric correction.
Hallot, Eric ULg; Cornet, Yves ULg; Hallot, Pierre ULg

Poster (2012, April)

Nowadays, image processing and GIS tools are more accessible and available to all. Most of diachronical or historical studies use the image geometric correction with several documents like old maps, plans ... [more ▼]

Nowadays, image processing and GIS tools are more accessible and available to all. Most of diachronical or historical studies use the image geometric correction with several documents like old maps, plans or aerial photographs. They are usually based on low-order polynomial equation to perfom these kinds of simplistic uses. Most of commercial softwares provide us a total or by ground control points RMSE but they don’t offer a overview of the spatial error distribution. More this does not guarantee that its significance for the other points of the image. Do not consider these errors can lead to erroneous observations and misinterpretations like historical moving streams or bank erosion rate. Using a least square adjustment (LSA), allow to recalculate the transformation equation from the pairs of control points coordinates. Assuming that residuals are spatially auto-correlated, we can build error vectors whose direction and magnitude symbolize the error at each point of the image. By another way, LSA manage the precision during transformation process by using a stochastic model in addition of the mathematical model during the transformation. This gives us variance on parameters of the transformation. Knowing the precision of all elements and variance/covariance matrix on transformation parameters, we apply variance propagation on the model. As an output, we obtain confidence ellipses on each transformed points, thus a spatial distribution of error for the entire image. Moreover, this leads us to determine statistically if observed movement are significant or not. The represent error is a complex problem that cannot be solved with a quick fix. In this work, we present an interesting example of using well-known topographic methods to solve image processing problems. [less ▲]

Detailed reference viewed: 46 (13 ULg)
Full Text
Peer Reviewed
See detailMacroH2A1 regulates the balance between self-renewal and differentiation commitment in embryonic and adult stem cells.
Creppe, Catherine ULg; Janich, Peggy; Cantarino, Neus et al

in Molecular and cellular biology (2012), 32(8), 1442-52

One of the most striking epigenetic alterations that occurs at the level of the nucleosome is the complete exchange of the canonical H2A histones for the macroH2A variant. Here, we provide insight into ... [more ▼]

One of the most striking epigenetic alterations that occurs at the level of the nucleosome is the complete exchange of the canonical H2A histones for the macroH2A variant. Here, we provide insight into the poorly recognized function of macroH2A in transcriptional activation and demonstrate its relevance in embryonic and adult stem cells. Knockdown of macroH2A1 in mouse embryonic stem (mES) cells limited their capacity to differentiate but not their self-renewal. The loss of macroH2A1 interfered with the proper activation of differentiation genes, most of which are direct target genes of macroH2A. Additionally, macroH2A1-deficient mES cells displayed incomplete inactivation of pluripotency genes and formed defective embryoid bodies. In vivo, macroH2A1-deficient teratomas contained a massive expansion of malignant, undifferentiated carcinoma tissue. In the heterogeneous culture of primary human keratinocytes, macroH2A1 levels negatively correlated with the self-renewal capacity of the pluripotent compartment. Together these results establish macroH2A1 as a critical chromatin component that regulates the delicate balance between self-renewal and differentiation of embryonic and adult stem cells. [less ▲]

Detailed reference viewed: 8 (0 ULg)
Full Text
See detailLes haut-parleurs électrodynamiques
Embrechts, Jean-Jacques ULg

Learning material (2012)

Detailed reference viewed: 71 (6 ULg)
See detailThe Venus nitric oxide nightglow vertical distribution : update, new features and modelling
Stiepen, Arnaud ULg; Gérard, Jean-Claude ULg; Soret, Lauriane ULg et al

Poster (2012, April)

Ultraviolet (UV) spectra of the delta (190-240 nm) and gamma (225-270 nm) bands of the nitric oxide (NO) molecule have been measured in the atmosphere of the Venus night side with the Spectroscopy for ... [more ▼]

Ultraviolet (UV) spectra of the delta (190-240 nm) and gamma (225-270 nm) bands of the nitric oxide (NO) molecule have been measured in the atmosphere of the Venus night side with the Spectroscopy for Investigation of Characteristics of the Atmosphere of Venus (SPICAV) instrument on board Venus Express (VEX). Excited NO molecules on the night side of the planet find their source in the radiative recombinaison of O(3P) and N(4S) atoms produced on the dayside by Extreme Ultraviolet (EUV) solar photons that cause photodissociation of CO2 and N2 molecules. We analyse with an improved statistics the behaviour of the vertical emission profile of the NO nightglow. We also present a method used to retrieve and analyse the volume emission rate. We describe the dependence of the vertical distribution with latitude and local time and its variability. New features in the vertical distribution of the NO emission such as double peaks are also exhibited. Furthermore, we use a one-dimensional chemical-diffusive model to compare the major features of the calculated O2 1.27 microm and NO UV emissions profiles with those observed with SPICAV. [less ▲]

Detailed reference viewed: 30 (6 ULg)
See detailHarmonisation of analytical methods for determining insoluble impurities in rendered animal fat
Lecrenier, Marie-Caroline ULg; Veys, Pascal; Berben, Gilbert et al

Conference (2012, April)

Detailed reference viewed: 9 (1 ULg)
Full Text
Peer Reviewed
See detailAnticipatory Modeling and Simulation for Inter Regional Security
Dubois, Daniel ULg; Asproth, Viveca; Stig C, Holmberg et al

Conference (2012, April)

Detailed reference viewed: 51 (4 ULg)
See detailEsthetic management : a team approach.
MAINJOT, Amélie ULg; LAMBERT, France ULg

Conference (2012, April)

Detailed reference viewed: 11 (0 ULg)
See detailInorganic carbon dynamics in coastal arctic sea ice and related air-ice CO2 exchanges
Geilfus, Nicolas-Xavier ULg; Tison, J.-L.; Carnat, G. et al

Poster (2012, April)

Detailed reference viewed: 7 (1 ULg)
Full Text
Peer Reviewed
See detailMotor fatigue measurement by distance-induced slow down of walking speed in multiple sclerosis
PHAN BA, Remy ULg; CALAY, Philippe ULg; GRODENT, Patrick ULg et al

in PLoS ONE (2012), 7(4), 34744

Background: Motor fatigue and ambulation impairment are prominent clinical features of people with multiple sclerosis (pMS). We hypothesized that a multimodal and comparative assessment of walking speed ... [more ▼]

Background: Motor fatigue and ambulation impairment are prominent clinical features of people with multiple sclerosis (pMS). We hypothesized that a multimodal and comparative assessment of walking speed on short and long distance would allow a better delineation and quantification of gait fatigability in pMS. Objectives: To compare 4 walking paradigms: the timed 25-foot walk (T25FW), a corrected version of the T25FW with dynamic start (T25FW+), the timed 100-meter walk (T100MW) and the timed 500-meter walk (T500MW). Methods: Thirty controls and 81 pMS performed the 4 walking tests in a single study visit. Results: The 4 walking tests were performed with a slower WS in pMS compared to controls even in subgroups with minimal disability. The finishing speed of the last 100-meter of the T500MW was the slowest measurable WS whereas the T25FW+ provided the fastest measurable WS. The ratio between such slowest and fastest WS (Deceleration Index, DI) was significantly lower only in pMS with EDSS 4.0-6.0, a pyramidal or cerebellar functional system score reaching 3 or a maximum reported walking distance !4000m. Conclusion: The motor fatigue which triggers gait deceleration over a sustained effort in pMS can be measured by the WS ratio between performances on a very short distance and the finishing pace on a longer more demanding task. The absolute walking speed is abnormal early in MS whatever the distance of effort when patients are unaware of ambulation impairment. In contrast, the DI-measured ambulation fatigability appears to take place later in the disease course. [less ▲]

Detailed reference viewed: 111 (12 ULg)
Full Text
Peer Reviewed
See detailExplicit Analytic Solution to the Satellite Formation-Keeping Problem
Cho, Hancheol ULg; Udwadia, Firdaus

in Song, Gangbing; Malla, Ramesh (Eds.) Earth and Space 2010: Engineering, Science, Construction, and Operations in Challenging Environments, Honolulu 14-17 March 2010 (2012, April)

This paper presents explicit and exact formation-keeping guidance schemes that use a new method to determine control inputs and state trajectories. With this approach rooted in some recent advances in ... [more ▼]

This paper presents explicit and exact formation-keeping guidance schemes that use a new method to determine control inputs and state trajectories. With this approach rooted in some recent advances in analytical dynamics, explicit control inputs to exactly maintain a given formation configuration are easily determined using continuous thrust propulsion systems. The complete nonlinear problem is addressed, and no linearizations and/or approximations are made. The approach provides a marked improvement over existing results in that the control forces, which cause geometric formation-keeping constraints to be exactly satisfied for Keplerian reference orbits, are found in closed form. Extensive computational simulations are performed to demonstrate the ease of implementation and the numerical accuracy attained. [less ▲]

Detailed reference viewed: 12 (1 ULg)
Full Text
See detail"Les testaments"
Moreau, Pierre ULg

in Chroniques notariales, vol. 55 (2012)

Detailed reference viewed: 27 (7 ULg)