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See detailGALOCAD User interface
Warnant, René ULg; Wautelet, Gilles ULg

Report (2008)

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See detailLe galop des conducteurs. Etat de l'art.
Lilien, Jean-Louis ULg

in Electra (2007), 232

Power line galloping is a large vibration (up to the sag) at very low frequency (fraction of Hz) occuring on power line spans under heavy wind and cold temperature, with ice/snow deposit. Galloping is due ... [more ▼]

Power line galloping is a large vibration (up to the sag) at very low frequency (fraction of Hz) occuring on power line spans under heavy wind and cold temperature, with ice/snow deposit. Galloping is due to aerodynamic or aeroelastic instability. It may cause dramatic damages on conductor, hardware and towers. [less ▲]

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See detailGame over : mathématiques et jeux vidéos
Rigo, Michel ULg

Learning material (2011)

Le but de cet exposé est de présenter, à travers plusieurs exemples simples, des outils mathématiques utilisés dans la conception de jeux vidéos (par exemple : projections, produits scalaire et vectoriel ... [more ▼]

Le but de cet exposé est de présenter, à travers plusieurs exemples simples, des outils mathématiques utilisés dans la conception de jeux vidéos (par exemple : projections, produits scalaire et vectoriel, calcul matriciel pour l'animation en 3D, fonctions et fractales pour la création de textures procédurales et de matériaux, etc.). Les exemples seront choisis en fonction des connaissances préalables du public (analyse, algèbre, géométrie) et permettront de mettre en évidence l'utilité en infographie des concepts vus au cours de mathématiques. [less ▲]

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See detailGame over! Wildlife collapse in northern Central African Republic
Bouché, Philippe ULg; Nzapa Mbeti Mange, Roland; Tankalet, Floride et al

in Environmental Monitoring & Assessment (2012), 184(11), 7001-7011

The wildlife populations of northern Central African Republic (CAR) have long suffered intense uncontrolled hunting. Socio-political turmoil in northern CAR that started in 2002 resulted in a rebellion in ... [more ▼]

The wildlife populations of northern Central African Republic (CAR) have long suffered intense uncontrolled hunting. Socio-political turmoil in northern CAR that started in 2002 resulted in a rebellion in 2006. An aerial sample count was carried out in northern CAR after the cease-fire to assess the impact of this troubled period on wildlife. The survey was flown at the end of the dry season in February-March 2010. It covered a landscape complex of 95 000 km² comprising national parks, hunting reserves and community hunting areas. Comparison with earlier surveys reveal a dramatic decline of wildlife: the numbers of large mammals fell by 94% in 30 years, probably due to poaching, loss of habitat and diseases brought by illegal movements of cattle. Elephant (Loxodonta africana), reduncini and topi (Damaliscus lunatus) populations showed the greatest decline (each over 90%). Other species declined by 70 to 80% during the same period. The future of the rest of the wildlife in this area is dark without a strong commitment to provide adequate funding and quickly implement determined field management. Reinforced cooperation with neighbouring Chad and Sudan is required since they are facing similar problems. [less ▲]

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See detailGame species monitoring using road–based distance sampling in association with thermal imagers: a covariate analysis
Morelle, Kevin ULg; Bouché, Philippe; Lehaire, François ULg et al

in Animal Biodiversity and Conservation (2012), 35(2), 253-265

Monitoring of game species populations is necessary to adequately assess culling by hunters in areas where natural large predators are absent. However, game managers have to control several species and ... [more ▼]

Monitoring of game species populations is necessary to adequately assess culling by hunters in areas where natural large predators are absent. However, game managers have to control several species and they often lack of an efficient and convenient survey design method. Monitoring several species at that same time over large areas could thus be cost– and time–effective. We tested the influence of several factors during monitoring of three common game species, (wild boar, roe deer and red fox, using road–based distance sampling in association with thermal imagers. This pilot survey based on 20 night counts in five contrasting sites studied the effect of several covariates (species, thermal imaging, observer, group size, and habitat type) on the detection probabilities. No differences were observed between thermal imagers and group sizes , but we found differences between observers . Expected differences were also observed between species and between habitat type. Our results show that the detectability of low cost thermal imaging equipment is similar to that of more expensive methods, highlighting new possibilities for the use of thermal imagery by game managers. Although adjustments should be made to the study design our findings suggest that large–scale multi–species monitoring could be an efficient method for common game species. [less ▲]

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See detailGamma Dor and Gamma Dor - Delta Sct Hybrid Stars In The CoRoT LRa01
Hareter, M.; Reegen, P.; Miglio, A. et al

in ArXiv e-prints (2010), 1007

A systematic search for gamma Dor and gamma Dor - delta Scuti hybrid pulsators was conducted on the CoRoT LRa01 Exo-archive yielding a total of 418 gamma Dor and 274 hybrid candidates. After an automatic ... [more ▼]

A systematic search for gamma Dor and gamma Dor - delta Scuti hybrid pulsators was conducted on the CoRoT LRa01 Exo-archive yielding a total of 418 gamma Dor and 274 hybrid candidates. After an automatic jump correction 194 and 167 respectively, show no more obvious jumps and were investigated in more detail. For about 25\% of these candidates classification spectra from the Anglo-Australian Observatory (AAO) are available. The detailed frequency analysis and a check for combination frequencies together with spectroscopic information allowed us to identify I) 34 gamma Dor stars which show very different pulsation spectra where mostly two modes dominate. Furthermore, a search for regularities in their oscillation spectra allowed to derive recurrent period spacings for 5 of these gamma Dor stars. II) 25 clear hybrid pulsators showing frequencies in the gamma Dor and delta Sct domain and are of A-F spectral type. [less ▲]

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See detailGamma interferon production correlates negatively with plasma levels of pregnancy-associated glycoprotein-1 (PAG-1) during gestation in dairy cows naturally infected with Neospora caninum
Lopez-Gatius, F.; Almeria, S.; Yániz, J. L. et al

in O’Leary, M.; Arnett, J. (Eds.) Pregnancy Protein Research (2009)

Gamma interferon (IFN-γ) production has been ascribed a role in protecting cows infected with Neospora caninum against abortion. The present study analyzes the interaction between IFN-γ production and ... [more ▼]

Gamma interferon (IFN-γ) production has been ascribed a role in protecting cows infected with Neospora caninum against abortion. The present study analyzes the interaction between IFN-γ production and levels of plasma pregnancy-associated glycoprotein-1 (PAG-1), as a marker of placental/fetal well-being, throughout gestation in naturally Neospora-infected dairy cows. Data were obtained from 88 pregnant cows from two herds: 62 seropositive and 26 seronegative for the parasite. Blood sample collection was performed on days 40, 90, 120, 150, 180 and 210 of gestation. Plasma was tested for antibodies against N. caninum, PAG-1 and IFN-γ. Twenty five (28.4%) pregnancies were recorded after AI using Holstein-Friesian semen (19 in seronegative and 6 in seropositive animals), and 63 (71.6%) after AI using Limousin semen (7 in seronegative and 56 in seropositive animals). Gamma interferon was detected in the plasma of 14 (22.6%) of the 62 Neospora-seropositive cows and could not be detected in any of the 26 seronegative animals. All 14 cows producing IFN-γ became pregnant by using Limousin semen. Our GLM repeated measures showed no effect of herd, lactation number, milk production at the time of pregnancy diagnosis and Neospora-seropositivity on plasma PAG-1 concentrations. Significant positive effects of both the day of gestation (P<0.0001) and interaction between day of gestation and breed of sire (P = 0.001) on PAG-1 values were registered. Cows carrying twins had higher (P = 0.002) PAG-1 concentrations throughout gestation than cows carrying singletons. Interactions between breed of sire and Neospora-seropositivity (P<0.0001), and between IFN-γ production and Neospora-seropositivity (P = 0.04) were also detected. Thus, Neospora-seronegative cows inseminated with Limousin and Neospora-seropositive cows with no IFN-γ production, exhibited higher PAG-1 concentrations throughout gestation than seropositive cows inseminated with Limousin semen and producing IFN-γ, respectively. Our data indicate that production of IFN-γ correlates negatively and, the production of antibodies against N. caninum is uncorrelated with plasma PAG-1 concentrations during gestation in Neospora-infected dairy cows. Our results also suggest that augmented Th1 cell-mediated immunity is related to a lower risk of abortion and therefore higher resistance to the parasite in cows inseminated with Limousin versus Holstein-Friesian semen. [less ▲]

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See detailGamma knife surgery for facial nerve schwannomas.
Litré, Claude Fabien ULg; Gourg, GP; Tamura, M et al

in Neurosurgery (2007), 60(5), 853-9

Radical resection of facial nerve schwannomas classically implies a high risk of severe facial palsy. Owing to the rarity of facial palsy after gamma knife surgery (GKS) of vestibular schwannomas ... [more ▼]

Radical resection of facial nerve schwannomas classically implies a high risk of severe facial palsy. Owing to the rarity of facial palsy after gamma knife surgery (GKS) of vestibular schwannomas, functional evaluation after GKS seems rational in this specific group of patients. To our knowledge, no previous similar evaluation exists in the literature. [less ▲]

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See detailGamma(5) quasiparticles and avoided quantum criticality in U(Ru,Rh)(2)Si-2
Silhanek, Alejandro ULg; Harrison, N.; Batista, C. D. et al

in Physica B: Condensed Matter (2006), 378-80

We discuss recent specific heat data in high magnetic fields on URu2Si2 and 4% Rh-doped URu2Si2 as well as previously published de Haas-van Alphen data at lower magnetic fields in pure URu2Si2: both of ... [more ▼]

We discuss recent specific heat data in high magnetic fields on URu2Si2 and 4% Rh-doped URu2Si2 as well as previously published de Haas-van Alphen data at lower magnetic fields in pure URu2Si2: both of which are consistent with quasiparticle bands formed from a hybridization between 5f-electron Gamma(5) doublets and regular conduction electrons. The system exhibits itinerant electron metamagnetism that gives rise to a putative quantum critical point at similar to 34-37T (depending on the % of Rh) that is subsequently unstable to field-induced phases. (c) 2006 Elsevier B.V. All rights reserved. [less ▲]

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See detailGamma-aminobutyric acid-sub(A) agonists differentially gnawing induced by indirect-acting dopamine agonists in C57BL/6J mice
Tirelli, Ezio ULg; Geter-Douglass, B.; Witkin, J. M.

in Journal of Pharmacology and Experimental Therapeutics (The) (1998), 284(1), 116-124

Evaluated the interaction of either gaboxadol HCl (THIP) or muscimol, both gamma-aminobutyric acid (GABA) type A agonists, with indirect-acting dopamine agonists (DAGs) methylphenidate, (+)-amphetamine ... [more ▼]

Evaluated the interaction of either gaboxadol HCl (THIP) or muscimol, both gamma-aminobutyric acid (GABA) type A agonists, with indirect-acting dopamine agonists (DAGs) methylphenidate, (+)-amphetamine, metamphetamine, amfonelic acid, indatraline, nomifensine, diclofensine, mazindol, and GBR 12935 and with direct-acting DAGs WIN 35,428, bupropion, GBR 12909, and cocaine. 1,832 male C57BL/6J mice were given either with saline or 1 of the doses of THIP or muscimol before an injection of a dopamine agonist. Gnawing on corrugated packing paper was measured. Results showed that: (1) indirect- but not direct-acting DAGs induced gnawing, (2) gnawing induced by indirect-acting DAGs GBR 12935, nomifensine and mazindol was potentiated in mice in which GABA type A receptors were stimulated either by THIP or muscimol, and (3) indirect DAGs had a differential sensitivity to the effects of THIP and muscimol. ((c) 1998 APA/PsycINFO, all rights reserved) [less ▲]

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See detailgamma-Glutamylpeptides from Rhynchosia albiflora.
Wathelet, Bernard ULg; Marlier, M.; Dardenne, G. et al

in Phytochemistry (1988), 27(2),

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See detailGamma-glutamylphenylalanine in Dolichos seeds
Dardenne, G. A.; Thonart, Philippe ULg

in Phytochemistry (1973), 12

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See detailGamma-probe-directed lymphatic mapping and sentinel lymphadenectomy in primary cutaneous melanoma.
Belhocine, T.; Pierard, Gérald ULg; Gielen, Jean-Louis ULg et al

in Dermatology : International Journal for Clinical & Investigative Dermatology (2002), 204(4), 355-61

BACKGROUND: Radiotracer and blue-dye lymphatic mapping is a recommended combined method to guide sentinel lymphadenectomy and full regional lymph node dissection in selected patients with cutaneous ... [more ▼]

BACKGROUND: Radiotracer and blue-dye lymphatic mapping is a recommended combined method to guide sentinel lymphadenectomy and full regional lymph node dissection in selected patients with cutaneous melanoma. OBJECTIVE: To evaluate the diagnostic accuracy and the prognostic value of gamma-probe-directed lymphatic mapping in cutaneous melanomas. METHODS: Sixty-five stage I and II melanoma patients underwent gamma-probe-directed lymphatic mapping. Sentinel lymph nodes were studied by both conventional and immunohistochemical stainings. The median follow-up was 11 months. RESULTS: Sensitivities of preoperative and intraoperative sentinel lymph node detection were 100 and 98%, respectively. Only 1 failure of detection and 1 missed same-basin metastasis were experienced in the axillary and cervical areas, respectively. Eleven patients (16.9%) had sentinel node metastases leading to adjuvant therapy. CONCLUSION: Gamma-probe-directed lymphatic mapping is useful for staging melanoma. However, in the expectation of a more specific identification of the sentinel lymph node, the standard protocol remains recommended for exploring the axillary and cervical areas. The histological examination supported in some cases by immunohistochemistry remains mandatory in all cases. [less ▲]

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See detailGamma-ray attenuation for characterization of future space launcher fuels
Carapelle, Alain ULg; Collette, Jean-Pierre ULg

in IEEE Transactions on Nuclear Science (2006), 53(4, Part 1), 2023-2026

Gamma-ray attenuation is used to measure cryogenic mixture density. Parameters are optimized for specific space application. A simple error formula is established. The feasibility of the measurement is ... [more ▼]

Gamma-ray attenuation is used to measure cryogenic mixture density. Parameters are optimized for specific space application. A simple error formula is established. The feasibility of the measurement is demonstrated. The effect of container's walls is measured. An automatic measurement device is built. A theoretical calculation is made for the geometry of Ariane V launcher. [less ▲]

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See detailGamma-ray attenuation for measuring cryogenic slush mixture density
Carapelle, Alain ULg; Collette, Jean-Pierre ULg

in Nuclear Instruments & Methods in Physics Research. Section B, Beam Interactions with Materials and Atoms (2005), 229(1), 111-116

Gamma-ray attenuation is used to measure cryogenic mixture density. Parameters are optimized for specific space application. A simple error formula is established. The feasibility of the measurement is ... [more ▼]

Gamma-ray attenuation is used to measure cryogenic mixture density. Parameters are optimized for specific space application. A simple error formula is established. The feasibility of the measurement is demonstrated. An automatic measurement device is built. (C) 2004 Elsevier B.V. All rights reserved. [less ▲]

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See detailGamma-ray induced cascades and magnetic fields in the intergalactic medium
Elyiv, Andrii ULg; Neronov, A.; Semikoz, D. V.

in Physical Review. D : Particles and Fields (2009), 80

We present the results of Monte Carlo simulations of three-dimensional electromagnetic cascade initiated by interactions of the multi-TeV γ rays with the cosmological infrared/optical photon background in ... [more ▼]

We present the results of Monte Carlo simulations of three-dimensional electromagnetic cascade initiated by interactions of the multi-TeV γ rays with the cosmological infrared/optical photon background in the intergalactic medium. Secondary electrons in the cascade are deflected by the intergalactic magnetic fields before they scatter on CMB photons. This leads to extended 0.1°-10° scale emission at multi-GeV and TeV energies around extragalactic sources of very high-energy γ rays. The morphology of the extended emission depends, in general, on the properties of magnetic fields in the intergalactic medium. Using Monte Carlo simulated data sets, we demonstrate that the decrease of the size of extended source with the increase of energy allows to measure weak magnetic fields with magnitudes in the range from ≤10[SUP]-16[/SUP]G to 10[SUP]-12[/SUP]G if they exist in the voids of the large scale structure. [less ▲]

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