References of "Scientific congresses and symposiums"
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See detailAurora at Earth, Jupiter and Saturn: a comparative view
Gérard, Jean-Claude ULg

Conference (2009, August)

The interaction of the solar wind with the magnetospheres of the giant planets is different from that with the terrestrial magnetosphere in several respects bearing consequences on the morphology and ... [more ▼]

The interaction of the solar wind with the magnetospheres of the giant planets is different from that with the terrestrial magnetosphere in several respects bearing consequences on the morphology and dynamics of the aurora: - the magnetospheres of the outer planets are dominated by the planetary rotation that can provide much of the energy for the processes acting within these magnetospheres. - the circulation of plasma may be driven by mass loading of the giant magnetospheres by moons and rings rather than by reconnection with the IMF. - the magnitude and orientation of the interplanetary magnetic field plays a key role in controlling the Earth’s auroral dynamics whereas the solar wind dynamic pressure appears as a key factor in triggering auroral intensification on Saturn. - The combination of imaging and spectral techniques indicates the characteristic energy of the auroral electrons is comparable on Earth and Saturn, but higher energies are associated with the Jovian aurora. As a consequence, Jupiter’s aurora appears relatively shielded from solar wind influences, except inside the auroral oval where transient bright emission has been observed following sudden compressions of the magnetosphere. The size and brightness of the main oval shows only a week dependence on solar wind conditions. By contrast, Saturn’s aurora is quite responsive to solar wind perturbations, as was observed during campaigns of concurrent observations between HST and Cassini. Auroral intensification events that are reminiscent of shock-induced Earth aurora appear to be triggered by sudden increases of the solar dynamic pressure more than by changes in the IMF orientation. However, simultaneous HST-Cassini observations indicate that localised auroral brightenings and ENA acceleration events may be observed under quiet solar wind conditions. The occurrence of substorms is a key characteristics of the Earth’s auroral dynamics. Localized auroral enhancements have also been observed on Jupiter and Saturn. They have been associated to reconnection events causing events similar to substorms. [less ▲]

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See detailNetwork Virtualization Architecture: Proposal and Initial Prototype
Schaffrath, Gregor; Werle, Christoph; Papadimitriou, Panagiotis et al

in ACM SIGCOMM Workshops Proceedings (2009, August)

The tussle between reliability and functionality of the Internet is firmly biased on the side of reliability. New enabling technologies fail to achieve traction across the majority of ISPs. We believe ... [more ▼]

The tussle between reliability and functionality of the Internet is firmly biased on the side of reliability. New enabling technologies fail to achieve traction across the majority of ISPs. We believe that the greatest challenge is not in finding solutions and improvements to the Internet's many problems, but in how to actually deploy those solutions and re-balance the tussle between reliability and functionality. Network virtualization provides a promising approach to enable the coexistence of innovation and reliability. We describe a network virtualization architecture as a technology for enabling Internet innovation. This architecture is motivated from both business and technical perspectives and comprises four main players. In order to gain insight about its viability, we also evaluate some of its components based on experimental results from a prototype implementation. [less ▲]

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See detailComparison of bovine colostrum whey and defatted bovine colostrum supplementation on piglet post-weaning growth check
Boudry, Christelle ULg; Gauthier, Vincent ULg; Buldgen, André

in Book of the Abstracts of the 60th Annual Meeting of the European Association for Animal Production (2009, August)

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See detailTransfer of heroin profiling method from conventional GC-MS to Fast-GC-MS and UHPLC-MS/MS
Debrus, Benjamin ULg; Broséus, Julian; Guillarme, Davy et al

Conference (2009, August)

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Peer Reviewed
See detailAphid-ant mutualism: How do aphids focus ant foraging?
Verheggen, François ULg; Detrain, Claire; Diez, Lise et al

Conference (2009, August)

The mutualistic relationships that occur between myrmecophilous aphids and ants are based on the rich food supply that honeydew represents for ants and on the protection they provide against aphid natural ... [more ▼]

The mutualistic relationships that occur between myrmecophilous aphids and ants are based on the rich food supply that honeydew represents for ants and on the protection they provide against aphid natural enemies. While aphid predators and parasitoids actively forage for oviposition sites by using aphid semiochemicals, scouts of aphid-tending ant species would also benefit from locating honeydew resources by orienting toward aphid pheromone sources. The present study aims to identify the chemical factors that attract ants and that maintain their mutualistic relationships with aphids. The perception and behavioral impact of Aphis fabae alarm pheromone, namely (E)-β-farnesene, on Lasius niger were firstly investigated using electroantennography and a four-arm olfactometer. Aphis fabae honeydew sugar composition was subsequently analyzed while the foraging and recruiting behaviour of L. niger scouts towards each of the identified sugars was studied. Clear electrical depolarisations were observed from L. niger scout antennae to stimulations of A. fabae alarm pheromone. Scouts were significantly attracted toward (E)-β-farnesene in the four-arm olfactometer, suggesting for the first time that the latter compound is a key chemical in the establishment of the mutualism. Aphis fabae honeydew consisted of 9 identified mono-, di- and tri-saccharides and 8 hydrocarbons that could not be identified. The main identified sugars were sucrose, fructose, glucose and melezitose. L. niger scouts showed the following drinking preferences for the tested sugars: melezitose = sucrose = raffinose > glucose = fructose > maltose = trehalose = melibiose = xylose, with a recruitment launched toward the first three sugars. Therefore, ant scouts may use aphid semiochemicals to locate at distance an aphid colony and subsequently estimate honeydew quality by tasting it before recruiting conspecifics and establishing a mutualistic relationship. [less ▲]

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See detailspecialist committee V.3 entitled "Fabrication Technology" of the 17th International Ship and Offshore Structure Congress
Okada, T.; Caprace, Jean-David ULg; Estefen, S. F. et al

(2009, August)

The committee shall give an overview about new developments in the field of ship and offshore materials and fabrication techniques with focus on trends which are highly relevant for practical applications ... [more ▼]

The committee shall give an overview about new developments in the field of ship and offshore materials and fabrication techniques with focus on trends which are highly relevant for practical applications in the industry in the recent and coming years. Particular emphasis shall be given to the impact of welding and corrosion protection techniques on structural performance, on the development of lighter structures and on computer and IT technologies and tools, which are meant to link design and production tools and to support efficient production. [less ▲]

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See detailGenetic evaluation considering phenotypic data and limited molecular information using a novel equivalent model: Case study using effect of the mh locus on milk production in the dual-purpose Belgian Blue breed
Colinet, Frédéric ULg; Gengler, Nicolas ULg

in Book of Abstracts of the 60th Annual Meeting of the European Association for Animal Production (2009, August)

The introduction of molecular information into genetic evaluation systems is currently under research. Based on an equivalent method, we developed from existing theory a new alternative strategy for the ... [more ▼]

The introduction of molecular information into genetic evaluation systems is currently under research. Based on an equivalent method, we developed from existing theory a new alternative strategy for the prediction of gene effects and especially their smooth integration into genetic evaluations. Underlying hypothesis were based on the idea that knowledge of genotypes will not affect overall additive genetic variance but only change expected values of genetic effects for animals with known genotypes. However, all animals could not be genotyped. Thus, the developed equations were modified to allow the integration of the known genotype for a portion of the population. This strategy was tested for the mh locus (responsible for the double-muscling phenotype) in dual-purpose Belgian Blue cattle. The genotype was determined for 123 bulls and 1940 cows (+/+ 19.5, mh/+ 39.3 and mh/mh 41.2%). These animals had 11,150 daughters with test-day (TD) records. The genotypes were incorporated into a modified genetic evaluation based on the current routine multi-trait multibreed test-day model used in the Walloon Region (Belgium). Data used included 12,829,309 TD records for 689,057 dairy cows in production. The pedigree file contained 1,606,024 animals (cows with TD records and ancestors). Computation of the modified mixed model equations was done solving iteratively two systems of equations, one for the polygenic effects and one for the gene effect until the relative differences in the gene solutions were below 10-5. A linear extrapolation was also used to speed up the convergence of gene effects. As expected, the mh locus exerts negative effects on milk production traits. For the first three lactations, the average estimated allelic substitution effects were -158.7 kg milk, -8.93 kg fat and -5.64 kg protein per lactation (305 days). [less ▲]

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See detailBLUESEL - an INTERREG France-Wallonie-Vlaanderen project aiming at the conservation and the use of the genetic heritage of the dual-purpose Blue Breeds in Belgium and Northern France
Colinet, Frédéric ULg

in Book of Abstracts of the 60th Annual Meeting of the European Association for Animal Production (2009, August)

Dual-purpose Belgian Blue and North Blue cattle are mainly located on both sides of the border between France and Belgium. Even if these Belgian and French Blue breeds are related because of their common ... [more ▼]

Dual-purpose Belgian Blue and North Blue cattle are mainly located on both sides of the border between France and Belgium. Even if these Belgian and French Blue breeds are related because of their common ancestors in the former Mid and High Belgium cattle, these breeds diverged slightly under differentiated selection objectives in both countries. Within the BLUESEL project, a first aim consists to create a working group cross-border which will develop common guidelines for selection of bull dams and elite-matings for this dual-purpose Blue Breeds. This working group will create and help to conserve a common pool of bulls available for breeding in both countries. The project will also develop tools to harmonize the collection of phenotypic data (milk production and morphology). A joint genetic evaluation for production traits will be developed, adapted to the specifities of these breeds and integrating data provided by both countries. Others objectives of BLUESEL are the implementation of a technical and economical guidance of these farms and the improvement of profitability of farms through advice on management and on improvement of livestock. The valorisation of these breeds through the development of new and specific products (e.g. cheese products) is another objective. In summary, the whole project should contribute maintaining biodiversity in this cross-border region through conservation and use of animals naturally adapted. The BLUESEL project was launched in July 2008. It is conceived for four years and is supported by the European Union, the Walloon Region, the Nord-Pas-de Calais Region and the General Council of Department of Nord. [less ▲]

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See detailHiggs Exclusive Production
Dechambre, Alice ULg

Poster (2009, August)

Detailed reference viewed: 16 (2 ULg)
See detailEntanglement of random localized and multifractal states
Martin, John ULg; Giraud, Olivier; Georgeot, Bertrand

Conference (2009, August)

Detailed reference viewed: 7 (0 ULg)
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See detailGenetic evaluation considering phenotypic data and limited molecular information using a novel equivalent model: Case study using effect of the mh locus on milk production in the dual-purpose Belgian Blue breed
Colinet, Frédéric ULg; Gengler, Nicolas ULg

Conference (2009, August)

The introduction of molecular information into genetic evaluation systems is currently under research. Based on an equivalent method, we developed from existing theory a new alternative strategy for the ... [more ▼]

The introduction of molecular information into genetic evaluation systems is currently under research. Based on an equivalent method, we developed from existing theory a new alternative strategy for the prediction of gene effects and especially their smooth integration into genetic evaluations. Underlying hypothesis were based on the idea that knowledge of genotypes will not affect overall additive genetic variance but only change expected values of genetic effects for animals with known genotypes. However, all animals could not be genotyped. Thus, the developed equations were modified to allow the integration of the known genotype for a portion of the population. This strategy was tested for the mh locus (responsible for the double-muscling phenotype) in dual-purpose Belgian Blue cattle. The genotype was determined for 123 bulls and 1940 cows (+/+ 19.5, mh/+ 39.3 and mh/mh 41.2%). These animals had 11,150 daughters with test-day (TD) records. The genotypes were incorporated into a modified genetic evaluation based on the current routine multi-trait multibreed test-day model used in the Walloon Region (Belgium). Data used included 12,829,309 TD records for 689,057 dairy cows in production. The pedigree file contained 1,606,024 animals (cows with TD records and ancestors). Computation of the modified mixed model equations was done solving iteratively two systems of equations, one for the polygenic effects and one for the gene effect until the relative differences in the gene solutions were below 10-5. A linear extrapolation was also used to speed up the convergence of gene effects. As expected, the mh locus exerts negative effects on milk production traits. For the first three lactations, the average estimated allelic substitution effects were -158.7 kg milk, -8.93 kg fat and -5.64 kg protein per lactation (305 days). [less ▲]

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See detailDamping material characterization and modeling: an industrial case-study
Poncelet, Fabien ULg; Bernay, Bruno; Kerschen, Gaëtan ULg et al

in International Design Engineering Technical Conferences & Computers and Information in Engineering Conference (IDETC/CIE 2009), San Diego, 2009 (2009, August)

Turbojet engines contain potential nonlinearity sources such as geometric nonlinearities due to the slenderness and the length of modern blades, contacts between the blades and the shrouds, friction in ... [more ▼]

Turbojet engines contain potential nonlinearity sources such as geometric nonlinearities due to the slenderness and the length of modern blades, contacts between the blades and the shrouds, friction in the connections, and material nonlinearities. This paper focuses on the damping material which can be found in some stator stages of low-pressure compression parts. This material makes the shroud and all the blades of the stage interdependent, providing damping and fluid vein airtightness. The objective is to propose a characterization and a numerical modeling methodology that could easily be integrated within an industrial process. Nonlinearity characterization tests, based on the Restoring Force Surface method, are presented as well as viscoelastic characterization. Finally the proposed viscoelastic modeling, based on the Modal Strain Energy method, is validated against experimental data. [less ▲]

Detailed reference viewed: 87 (7 ULg)
See detailAssociations among BCS, milk production and days-open in Walloon primiparous dairy cows
Laloux, Laurent; Bastin, Catherine ULg; Gillon, Alain ULg et al

in Book of abstracts of the 60th annual meeting of the European Association for Animal Production (2009, August)

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See detailEffect of bovine colostrums of 1st, 2nd and 3rd milking on growth performance and the immune system of newly-weaned piglets after an E. coli LPS challenge
Gauthier, Vincent ULg; Boudry, Christelle ULg; Buldgen, André

in Book of the Abstracts of the 60th Annual Meeting of the European Association for Animal Production (2009, August)

Detailed reference viewed: 31 (8 ULg)
See detailHow to combine pedigree and marker information into a single estimator for the calculation of relationships?
Bömcke, Elisabeth ULg; Soyeurt, Hélène ULg; Szydlowski, Maciej et al

in Book of Abstracts of the 60th Annual Meeeting of the European Association for Animal Production (2009, August)

Relationship coefficients are particularly useful to improve genetic management of endangered populations. These coefficients are traditionally based on pedigree data. In case of incomplete or missing ... [more ▼]

Relationship coefficients are particularly useful to improve genetic management of endangered populations. These coefficients are traditionally based on pedigree data. In case of incomplete or missing pedigree, they are replaced by coefficients calculated from molecular data when this information is available. However, genotyping a complete population for a sufficient number of markers can be impossible. The main objective of this study was therefore to develop a new method to estimate relationship by combining molecular with pedigree data. It will be useful for specific situations, where neither pedigree nor molecular data are complete. In a companion paper, the compatible coefficients were determined. In this study, based on simulations of pedigree and marker data, the method to combine the selected coefficients was determined. Various parameters were taken into account in the model: number and quality of the marker (e.g. marker informativeness), mutation rate, quality of the pedigree (e.g. generation-equivalents), … The combined estimator has several advantages. Especially, negative relationship values obtained in literature with molecular-based estimators in case of small inbred populations can be avoided. In conclusion, this combined estimator was originally developed for the management of an endangered horse population. It should also be a promising alternative to traditionally used estimators, e.g. for the management of small and/or rare breeds; especially in case of inbred populations, with both incomplete pedigree and partial molecular information. [less ▲]

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See detailBiting midges (Ceratopogonidae: Culicoïdes) in Belgium: a comparison between indoor and outdoor trapping in cattle and sheep farms.
Losson, Bertrand ULg; Robert, Nancy ULg; Paternostre, Julien ULg et al

Conference (2009, August)

Bluetongue, a vector born disease of ruminants, was identified for the first time in Northern Europe in 2006. The vectors are insects of the family Ceratopogonidae, genus Culicoides. In Belgium, no recent ... [more ▼]

Bluetongue, a vector born disease of ruminants, was identified for the first time in Northern Europe in 2006. The vectors are insects of the family Ceratopogonidae, genus Culicoides. In Belgium, no recent data were available about the biology of these insects including their feeding habits and behaviour. The present study was carried out in order to evaluate the indoor and outdoor activity of these Diptera in 5 different cattle or sheep farms in 2008. Two sheep and 3 cattle farms were selected in the Province of Luxembourg, Belgium. In each farm 2 Onderstepoort Veterinary Institute (OVI) traps were installed respectively inside and outside the animal accommodation. Trapping was carried out twice a week from 17:00 until 24:00.The collecting vials were replaced every hour. A portable suction trap (BackTrap® U.S.A) was used twice on each visit to collect midges on the animals. In each farm the study was carried out for 6 successive weeks, 2 farms being monitored together. The study began on July 28th and ended on November 30th 2008. A total of 2591 culicoides were trapped. A majority of those (88.76%) were trapped indoors whereas 10.03% were trapped outdoors and 1.21% directly on the animals. The ambient temperature had a marked effect very few culicoides being trapped below 13°C. Three main species or species complex were identified both indoors and outdoors: C. obsoletus/scoticus, C. dewulfi, C. chiopterus. They represented 98.93% and 85.03% indoors and outdoors respectively. On the animals only C. obsoletus/scoticus and C. dewulfi were found. [less ▲]

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See detailPotential of Dried Egg Yolk as a Source of Immunoglobulins to Control Salmonella in the Gastrointestinal Tract of the Broiler Chicken
Marcq, Christopher ULg; Portetelle, Daniel ULg; Chalghoumi, RAJA ULg et al

in 17th European Symposium on Poultry Nutrition : Proceedings & Abstracts (2009, August)

Egg yolk immunoglobulins (IgY) are considered as a promising tool of establishing passive immunity against enteric pathogens (e.g. Salmonella) in poultry (Kovacs-Nolan and Mine, 2005). In our previous ... [more ▼]

Egg yolk immunoglobulins (IgY) are considered as a promising tool of establishing passive immunity against enteric pathogens (e.g. Salmonella) in poultry (Kovacs-Nolan and Mine, 2005). In our previous works, in-feed incorporation of freeze-dried yolk powder (FYP) improved performances of Salmonella-infected broilers (Marcq et al., 2009). Nevertheless, no extra value could be attributed to the presence of specific IgY when a comparison was done between impact of hyperimmune or non immune FYP both concerning growth performances and Salmonella infection. We hypothesized that these inconclusive in vivo results were related to the sensitivity of IgY to gastrointestinal conditions. Egg yolks with high IgY titers directed against Salmonella Enteritidis and Typhimurium were obtained from laying hens immunized as previously described (Chalghoumi et al., 2008). Three feed additives derived from these eggs were produced: FYP, spray-dried yolk powder (SYP), and freeze-dried water-soluble fraction of yolk powder (WSFP). A force-feeding assay was realized on these additives with 48 five-week-old males Ross broiler chicken (Salmonella spp.-free status). Survival of undigested IgY and bioactive Fab fragments was evaluated in the intestinal tract by ELISA. Statistical analyses were done using GLM procedure of Minitab 15.1. Software. Differences were considered significant when P<0.05. As a result of the digestive process, the levels of total and specific undigested IgY found throughout the intestine were dramatically reduced for the three additives. For FYP, no difference was observed with intestinal contents of control animals (P>0.05) and for WSFP, which correspond to semi-purified IgY, the immunological activity reached the same level than that for SYP (P>0.05) whereas its initial level was almost ten times higher. The results suggest a protective effect of whole yolk on IgY with SYP but such effect was not observed with FYP. High levels of Fab fragments were identified in intestinal contents, highlighting the importance of protein digestion in the digestive tract and especially pepsin digestion. These Fab fragments conserve their immunological functionality and remained detectable in all intestinal segments including the caecum which represents the major site of Salmonella infection in poultry. These results can explain our previous challenge data and reveal that a protection treatment should be applied to dried egg yolk to improve the resistance of IgY to gastrointestinal conditions in broilers. [less ▲]

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See detailAn integrated view of technical, economic and social factors influencing sustainabiligy of sixteen local European cattle breeds
Martin-Collado, D.; Diaz, C.; Choroszy, Z. et al

in Book of Abstracts of the 60th Annual Meeting of the European Association for Animal Production (2009, August)

This study aims to identify common patterns influencing dynamics and sustainability of 16 local European cattle breeds from Belgium, Estonia, Finland, France, Holland, Ireland, Italy and Spain. A broad ... [more ▼]

This study aims to identify common patterns influencing dynamics and sustainability of 16 local European cattle breeds from Belgium, Estonia, Finland, France, Holland, Ireland, Italy and Spain. A broad range of factors related to technical (e.g. farm size, cows/ha, land ownership), economic (e.g. cattle importance on farm and family income, type of market) and social (e.g. farmers and stakeholders attitude) aspects were surveyed on a total of 401 farms. Discriminant Analysis has been used to study the implications that heterogeneity within and across countries and breeds may have in making inferences in across country or breed analyses. Thus, farms were classified according to country and breeds. Then the objective was to evaluate how all factors available allow us to distinguish such classes. The analyses provided the percentage of observations (farms) that should not be included in the pre-defined groups (country and breed) according to the variables considered. When only economic variables were considered in the analyses, 36% and 59% of farms were incorrectly assigned to their country and breed, respectively. However, considering technical variables the proportions went down to 33% and 45%. Finally, when both groups of variables were considered 20% and 35% of farms were incorrectly assigned. To what extent these mismatches may allow us to identify general patterns has to be evaluated. [less ▲]

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See detailLiquid load point measurement in a reactive distillation packing by x-ray tomography
Aferka, Saïd ULg; Viva, Aurora ULg; Brunazzi, Elisabetta et al

Poster (2009, August)

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See detailCommissioning case study of a cooling ceiling system
Fonseca, N.; Hannay, J.; Andre, Philippe ULg

in Proceedings Building Simulation 2009: BS'09, Glasgow, August 2009 (2009, August)

As a part of commissioning case study, the cooling ceiling system of a commercial building in Brussels is experimentally evaluated by means a functional test procedure and a detailed thermal model of this ... [more ▼]

As a part of commissioning case study, the cooling ceiling system of a commercial building in Brussels is experimentally evaluated by means a functional test procedure and a detailed thermal model of this system. This one has to be used on situ, as diagnosis tool in commissioning process in order to determine the main parameters of the cooling ceiling systems. Due to the extended gazing surface of the building, the problem is the overheated zones submitted to the expected solar heat gain. The subsystems considered for commissioning process includes the fenestration, ventilation and cooling ceiling system. The interaction and individual operation conditions of each system are evaluated. A Functional Performance Testing guide (FPT) for cooling ceiling commissioning process is proposed. [less ▲]

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See detailCalculate relationships using pedigree and marker information – What to combine into a single estimator?
Bömcke, Elisabeth ULg; Szydlowski, Maciej; Gengler, Nicolas ULg

in Book of Abstracts of the 60th Annual Meeeting of the European Association for Animal Production (2009, August)

The knowledge of relationships among individuals is an important topic in all fields of modern genetics, from selection to conservation. Estimation of relationships was traditionally based on pedigree ... [more ▼]

The knowledge of relationships among individuals is an important topic in all fields of modern genetics, from selection to conservation. Estimation of relationships was traditionally based on pedigree data. Today, molecular data can replace pedigrees. Numerous methods already exist. However, genotyping a complete population for a sufficient number of markers can be impossible, e.g., in case of local and/or rare breeds. Therefore, the idea was to combine these 2 sources of information into a new single relationship estimator. Based on simulations, the aim of this study was to determine what could be combined. Following the principle that things have to be similar to be combined, we compared first two coefficients that have the advantage to be similarly defined: the additive relationship coefficient (axy) calculated from pedigrees and the total allelic relationship (taxy) obtained from markers. The similarity between these two coefficients was measured by means of linear regression and correlations. In order to highlight the influence of inbreeding, Wright relationship coefficient (rped,xy) were also compared to taxy transformed into rmol,xy. The results showed that the correlation increases when the values are made independent from inbreeding. If the pedigree coefficients are considered as the true value, both molecular coefficients tended to overestimate the relationship among individuals. It can be expected because they do not distinguish identical-by-state and identical-by-descendent alleles. The influence of marker quality was also highlighted. In all cases, the correlation coefficient increased when only the more informative loci were used. Uninformative genetic markers potentially making animals appear more related than they were. [less ▲]

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See detailLiver transplantation (LT) from donation after cardiac death (DCD) donors: Multicenter Belgian experience 2003-2007
Detry, Olivier ULg; Donckier, Vincent; Lucidi, Valerio et al

in Transplant International (2009, August), 22(S2), 62-234

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See detailBLUESEL - an INTERREG France-Wallonie-Vlaanderen project aiming at the conservation and the use of the genetic heritage of the dual-purpose Blue Breeds in Belgium and Northern France
Colinet, Frédéric ULg

Poster (2009, August)

Dual-purpose Belgian Blue and North Blue cattle are mainly located on both sides of the border between France and Belgium. Even if these Belgian and French Blue breeds are related because of their common ... [more ▼]

Dual-purpose Belgian Blue and North Blue cattle are mainly located on both sides of the border between France and Belgium. Even if these Belgian and French Blue breeds are related because of their common ancestors in the former Mid and High Belgium cattle, these breeds diverged slightly under differentiated selection objectives in both countries. Within the BLUESEL project, a first aim consists to create a working group cross-border which will develop common guidelines for selection of bull dams and elite-matings for this dual-purpose Blue Breeds. This working group will create and help to conserve a common pool of bulls available for breeding in both countries. The project will also develop tools to harmonize the collection of phenotypic data (milk production and morphology). A joint genetic evaluation for production traits will be developed, adapted to the specifities of these breeds and integrating data provided by both countries. Others objectives of BLUESEL are the implementation of a technical and economical guidance of these farms and the improvement of profitability of farms through advice on management and on improvement of livestock. The valorisation of these breeds through the development of new and specific products (e.g. cheese products) is another objective. In summary, the whole project should contribute maintaining biodiversity in this cross-border region through conservation and use of animals naturally adapted. The BLUESEL project was launched in July 2008. It is conceived for four years and is supported by the European Union, the Walloon Region, the Nord-Pas-de Calais Region and the General Council of Department of Nord. [less ▲]

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See detailCours sur les ingéniéries didactiques
Schneider-Gilot, Marguerite ULg

Conference (2009, August)

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See detailCertified Internet Coordinates
Kaafar, Mohamed Ali; Mathy, Laurent ULg; Barakat, Chadi et al

in ICCCN '09 Proceedings (2009, August)

We address the issue of asserting the accuracy of coordinates advertised by nodes of Internet coordinate systems during distance estimations. Indeed, some nodes may lie deliberately about their ... [more ▼]

We address the issue of asserting the accuracy of coordinates advertised by nodes of Internet coordinate systems during distance estimations. Indeed, some nodes may lie deliberately about their coordinates to mount various attacks against applications and overlays. Our proposed method consists in two steps: 1) establish the correctness of a node’s claimed coordinate (which leverages our previous work on securing the coordinates embedding phase using a Surveyor infrastructure); and 2) issue a time limited validity certificate for each verified coordinate. Validity periods are computed based on an analysis of coordinate inter-shift times observed on PlanetLab, and shown to follow a long-tail distribution (lognormal distribution in most cases, or Weibull distribution otherwise). The effectiveness of the coordinate certification method is validated by measuring the impact of a variety of attacks on distance estimates. [less ▲]

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See detailGeometric Study of Mixed-integer Sets from Two Rows of Two Adjacent Simplex Bases
Louveaux, Quentin ULg

Conference (2009, August)

We generalize the study of sets arising from two rows of a simplex tableau by considering bounds on the nonbasic variables. We show that new classes of facets arise that cannot be obtained from triangles ... [more ▼]

We generalize the study of sets arising from two rows of a simplex tableau by considering bounds on the nonbasic variables. We show that new classes of facets arise that cannot be obtained from triangles and quadrilaterals. Specifically, when exactly one upper bound on a non-basic variable is introduced, inequalities that can be derived from pentagons involving up to six variables also appear. [less ▲]

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See detailDisjunctions with moving targets
Dumitru, Magdalena ULg

Poster (2009, July 30)

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See detailBaseline data on cyanobacterial diversity near the new Princess Elizabeth Antarctic research station.
Fernandez Carazo, Rafael ULg; Namsaraev, Zorigto; Ertz, Damien et al

Poster (2009, July 27)

Detailed reference viewed: 18 (7 ULg)
See detailDoes Saturn's UV aurora vary with SKR phase?
Nichols, J. D.; Cowley, S. W. H.; Clarke, J. T. et al

Conference (2009, July 27)

Detailed reference viewed: 12 (1 ULg)
See detailNews from outer worlds
Grodent, Denis ULg

Conference (2009, July 27)

Detailed reference viewed: 4 (0 ULg)
See detailSaturn's equinoctial auroras
Nichols, J. D.; Gérard, Jean-Claude ULg; Grodent, Denis ULg et al

Conference (2009, July 27)

Detailed reference viewed: 7 (2 ULg)
See detailHST observations of Europa's atmospheric UV emission
Saur, J.; Feldman, P. D.; Strobel, D. F. et al

Conference (2009, July 27)

Detailed reference viewed: 9 (2 ULg)
See detailThe variability of auroral emissions on Jupiter and Saturn
Clarke; Nichols; Gérard et al

Conference (2009, July 27)

Detailed reference viewed: 3 (0 ULg)
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See detailExploring the Holocene through fossil cyanobacterial sequences from Antarctic lake sediments.
Fernandez Carazo, Rafael ULg; Waleron, Krzysztof; Hodgson, Dominic et al

Poster (2009, July 27)

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See detailObservations of jovian polar auroral filaments
Nichols; Clarke; Gérard et al

Poster (2009, July 27)

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See detailThe morphology of equatorial electron beams at Io
Jacobsen, S.; Saur, J.; Neubauer, F. M. et al

Conference (2009, July 27)

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See detailAsset Management Forum
Bodson, Laurent ULg

Conference (2009, July 23)

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See detailIMPROVING SOIL ORGANIC CARBON (SOC) PREDICTION BY FIELD SPECTROMETRY IN BARE CROPLAND BY REDUCING THE DISTURBING EFFECT OF SOIL ROUGHNESS
Denis, Antoine ULg; Tychon, Bernard ULg; Stevens, Antoine et al

in Geoscience and Remote Sensing Symposium, 2009 IEEE International, IGARSS 2009 (2009, July 17)

The spatial estimation of Soil Organic Carbon (SOC) at large scale in outdoor condition is an important issue. It has been largely demonstrated that diffuse reflectance spectroscopic techniques, are ... [more ▼]

The spatial estimation of Soil Organic Carbon (SOC) at large scale in outdoor condition is an important issue. It has been largely demonstrated that diffuse reflectance spectroscopic techniques, are efficient for SOC determination in field conditions. However these methods are influenced by disturbing factors such as soil water content, vegetation residues and surface roughness, the later being the object of this study. Our laboratory experiments showed that the accuracy of SOC prediction from shadowed soil samples with spectroscopy techniques decreases with increasing soil shadow. In this study a new methodology using a digital camera for identifying and correcting the effect of soil shadow on field reflectance spectra measured with an Analytical Spectral Devices (ASD) during field campaign in bare crop lands has been elaborated and tested. Results showed that the proposed shadow correction method enables improving significantly SOC prediction accuracy and performs better than traditionally used methods consisting in automatic signal processing. [less ▲]

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See detailLa recherche d’une forme théâtrale pour les sans-voix
Delhalle, Nancy ULg

Conference (2009, July 17)

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See detailA Capability Approach to the European Directive on Parental Leave
Orianne, Jean-François ULg

Conference (2009, July 16)

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See detailDiversity management status in morocco. an exploratory stydu
El Abboubi, Manal ULg; El Kandoussi, Fatima

Conference (2009, July 16)

The purpose of this article is to explore diversity management specificities in arab countries, especially in Morocco (North Africa). We analyse organisational initiatives, managers’ perception and the ... [more ▼]

The purpose of this article is to explore diversity management specificities in arab countries, especially in Morocco (North Africa). We analyse organisational initiatives, managers’ perception and the way they mainstream diversity tools in their management. The Moroccan industry is based on two major sectors: agriculture food and textile. Those two activities represent more than 50% of the PIB, 70% of the national employment and 75% of exportations. We focus our study on those two sectors which are a pillar of the morrocan economy. Our sample consist of 30 questionnaire sent to companies that have more than 50 employees. We received 16 answers. We questioned CEOs, managers, middle managers and employees. The main contribution of the research is that moroccan leaders are aware of their responsibilities to implement and carry out diversity projects. The main topics mentioned concerns equality and gender. However, they have no skills or power to ensure that responsibilities fully. Diversity management is not included in the strategy. It remains a minor task operated mainly by the human resource department. Morrocan managers need more specific trainings and a global governmental policy to guide their actions. Employees are not well informed about their rights. Moreover, Morocco will open a free exchange zone in 2010. This is an opportunity for many international companies to invest in the country. Most of them are from Europe and USA. They are well informed about diversity management, especially gender issues. This represents a threat for Moroccan companies who feel the urgency to develop a national framework for diversity management. Our research is still under study. We are collecting more data and we aim to integrate some extra stakeholders in the sample. Mainly the government and the local communities. The fact that we interviewed only managers gives us a limited view of the diversity management status in Morocco. [less ▲]

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See detailSérologies Mycoplasma pneumoniae et Chlamydia au CHU de Liège.
HUYNEN, Pascale ULg

Conference (2009, July 16)

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See detailUnusual quantitative (co)polymer chain coupling reaction based on isoprene and cobalt complexes
Debuigne, Antoine ULg; Jérôme, Christine ULg; Detrembleur, Christophe ULg

Conference (2009, July 15)

Nowadays, progresses in medicine, biotechnology, microelectronic and many other fields are more and more sustained by the development of novel polymer materials with constantly improved properties and ... [more ▼]

Nowadays, progresses in medicine, biotechnology, microelectronic and many other fields are more and more sustained by the development of novel polymer materials with constantly improved properties and well-defined molecular parameters. In this context, we designed an innovative and very promising tool for macromolecular engineering. This technique, called Isoprene-Assisted Radical Coupling (I-ARC), allows to couple quantitatively polymer chains preformed by Cobalt-Mediated Radical Polymerization (CMRP), an efficient controlled radical polymerization system for vinyl acetate (VAc) and acrylonitrile (AN). Typically, addition of isoprene to well-defined polymers prepared by CMRP invariably leads to the quantitative coupling reaction of the chains, as assessed by the perfect doubling of the molar mass of the polymer. Importantly, the I-ARC reaction is not limited to macromolecules with low molar masses and homopolymers, contrary to the previously reported radical chains coupling methods. Indeed, when applied to diblock copolymers, I-ARC constitutes a straightforward approach for the synthesis of telechelic symmetrical ABA triblock copolymers, as illustrated by the preparation of poly(vinyl acetate)-b-poly(acrylonitrile)-bpoly(vinyl acetate) triblock copolymers and their derivatives. [less ▲]

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See detailHurford's Constraint Revisited
Dumitru, Magdalena ULg

Conference (2009, July 11)

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See detailSteel construction and sustainability
Reiter, Sigrid ULg

Conference (2009, July 10)

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See detailProfessional acts and services rendered by psychologists : a Belgian study.
Hansez, Isabelle ULg; Mormont, Marie; Côte, Virginie

Conference (2009, July 10)

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See detailLeuven English Old to New (LEON): Some ideas on a new corpus for longitudinal diachronic studies.
Petré, Peter ULg

Conference (2009, July 09)

Despite the explosion of diachronic corpora of English in the last few decades, still not a single corpus exists that covers the entire documented history of English. Although its compilation is generally ... [more ▼]

Despite the explosion of diachronic corpora of English in the last few decades, still not a single corpus exists that covers the entire documented history of English. Although its compilation is generally perceived as most attractive (Rissanen 2000: 13), corpus compilers do not seem to believe in its creation in the near future. This is regrettable, as many linguists dealing with longitudinal developments such as grammaticalization need to cover very long time spans, and are forced to combine several, not necessarily compatible, corpora (e.g. Hilpert 2008, van Linden 2009). Clearly, their results are less reliable than they might be if a single corpus existed (for example, Gries and Hilpert’s data (2008) show a major shift in the collocational profile of shall about 1710; however, this is precisely where one corpus they use ends and a second – rather different one – begins). So I tentatively started compiling a corpus myself, provisionally called LEON (Leuven English Old to New). The basic architecture of LEON comprises a 400,000 word corpus for each HC-period, and after 1710 for the periods 1710-1780, 1780-1850, 1850-1920, 1920-1990 and post-1990. Data available from 1250-1350, a less well represented period, serve as a template on which other subperiods are to be based to acquire best comparability of genre and region. To make up for the lack of some genres (letters, diaries) and social stratification, for each period after 1350 an additional, selfsufficient 600,000 words corpus is envisaged. While LEON is primarily conceived as a ‘meta-corpus’, mining existing corpora, some additions are envisaged too (e.g. the unedited Statutes Rwl. B.520, dated a1325). LEON does not aim at full comparability (which would be presumptuous), but wants to optimize the usefulness of concepts like ‘equal size of subperiods’ or ‘diachronic text prototype’ (HC). LEON might be, as compared to the present ‘big evil’, a ‘lesser evil’. References Gries, Stefan Th. and Martin Hilpert. The identification of stages in diachronic data: variability-based neighbour clustering. Corpora Vol. 3 (1): 59–81. Hilpert, Martin. 2008. Germanic future constructions A usage-based approach to language change. Amsterdam & Philadelphia: John Benjamins. Los, Bettelou. 2005. The rise of the to-infinitive. Oxford: Oxford University Press. Rissanen, Matti & Merja Kytö. 1993. General introduction. In Rissanen, Matti, Merja Kytö & Minna Palander-Collin, eds. 1993. Early English in the computer age: Explorations through the Helsinki Corpus. Berlin: Mouton de Gruyter. 1-17. Rissanen, Matti. 2000. The world of English historical corpora: From Cædmon to computer age. Journal of English Linguistics 28: 7-20. van Linden, An. 2009. Dynamic, deontic and evaluative adjectives and their clausal complement patterns: A synchronic-diachronic account. PhD dissertation, University of Leuven. [less ▲]

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See detailSur la philosophie politique de l’éducation (Foucault, Alain, Canguilhem)
Bolmain, Thomas ULg

Conference (2009, July 08)

Ce travail consiste pour l'essentiel en une brève réévaluation des Propos sur l'éducation d'Alain (1932). Ce travail est entrepris à la lumière d'un problème précis : celui des rapports entre philosophie ... [more ▼]

Ce travail consiste pour l'essentiel en une brève réévaluation des Propos sur l'éducation d'Alain (1932). Ce travail est entrepris à la lumière d'un problème précis : celui des rapports entre philosophie critique et apprentissage à la philosophie (et, corrélativement, l'importance de la position du maître dans ce processus). Les recherches d'Alain devront à cet égard être rapprochées de certaines propositions de G. Canguilhem (élève du précédent) et de M. Foucault (lui-même disciple de Canguilhem). Au total, on montrera qu'une réflexion sur l'éducation est indispensable à l'éclaircissement du concept de critique, qui fait le centre de la philosophie depuis Kant. [less ▲]

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See detailOCCP Seminar on Dominant Positions and New Technologies
Petit, Nicolas ULg

Conference (2009, July 08)

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See detailA discrete competitive facility location model with variable attractiveness
Kucukaydin, Hande ULg; Aras, Necati; Altinel, I. Kuban

Conference (2009, July 08)

We consider the discrete version of the competitive facility location problem in which new facilities have to be located by a new market entrant to compete against already existing ones that may belong to ... [more ▼]

We consider the discrete version of the competitive facility location problem in which new facilities have to be located by a new market entrant to compete against already existing ones that may belong to one or more competitors. The objective of the firm is to determine the locations of the new facilities and their attractiveness levels to maximize the profit. We formulate a mixed-integer nonlinear programming model for this problem and propose three methods for its solution: a Lagrangean heuristic, two branch-and-bound methods using Lagrangean and nonlinear programming relaxations. [less ▲]

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See detailIR and UV spectroscopic signatures of DNA structures in the gas phase
Gabelica, Valérie ULg

Conference (2009, July 08)

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See detailVehicle loading optimization with stochastic supply
Amand, Guillaume ULg; Arda, Yasemin ULg; Crama, Yves ULg et al

Conference (2009, July 07)

The increased availability of information makes it possible to coordinate processes which are usually functionnally separated in large companies, such as production and transportation. This work ... [more ▼]

The increased availability of information makes it possible to coordinate processes which are usually functionnally separated in large companies, such as production and transportation. This work investigates the optimization of vehicle loading for individual orders over a multiperiod horizon when items have stochastic release dates from production, and time windows are imposed for delivery at the customer plant. The loading decisions are made in order to minimize the expected cost. Starting from the deterministic model, we develop scenario-based models for the stochastic version of the problem and we investigate the performance of various solution methods. [less ▲]

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See detailLe droit procéduralisé comme intermédiaire : méthode et approche diachronique
Cerfontaine, Gaëtan ULg

Conference (2009, July 07)

Cette communication est basée sur une recherche empirique menée pendant près d'un an sur un programme européen de développement durable de l'économie rurale appelé LEADER (Liaison Entre Actions de ... [more ▼]

Cette communication est basée sur une recherche empirique menée pendant près d'un an sur un programme européen de développement durable de l'économie rurale appelé LEADER (Liaison Entre Actions de Développement de l'Economie Rurale). Ce dernier s'inscrit dans un mouvement, abondamment commenté par la littérature sociologique, de territorialisation et de procéduralisation de l'action publique (Duran, Thoenig, 1996), conférant aux acteurs locaux un pouvoir inédit de définition des enjeux. La majorité de ces travaux souligne les relations d'interdépendance et les modalités de coordination entre les différents acteurs (Le Galès, 1995) et met également en évidence un système articulant les différentes logiques d'action (Crozier, Friedberg, 1977 ; Musselin, 2005). Toutefois, les interactions et les jeux de pouvoir, qui figurent au cour de la sociologie de l'action organisée, ne rendent compte, à eux seuls, que de certaines formes relativement stables de la vie des organisations (Friedberg, 1993). Basée sur une méthodologie fondée sur les entretiens face à face (Friedberg, 1988), cette approche analytique semble mieux se prêter à l'analyse de la permanence que des processus qui sous-tendent l'innovation. L'apparition depuis quelques années d'analyses symétriques conférant un pouvoir d'actantialité aux objets (Callon, 1986) a contribué au développement d'approches par les instruments (Le Galès, Lascoumes, 2005) pouvant intégrer les questions classiques que posent la science politique et la sociologie de l'action publique (Lascoumes, 1996). Considérer les politiques procédurales comme des objets intermédiaires (Mélard, 2008) permet ainsi de rendre compte de leur capacité de médiation (Latour, 2006) et de donner un compte rendu de l'action plus dynamique. Comme ce fut le cas pour notre travail, l'entrée dans l'analyse par les controverses comme le suggère ce courant théorique n'est cependant pas toujours possible. L'entrée par les nombreux documents produits tels que les programmes de développement stratégique, les présentations de projets ou les évaluations, constitue ainsi, non pas une solution du moindre mal, mais au contraire, comme l'a montré Florian Charvolin (2003), une méthode permettant de déployer toute la capacité médiatrice de ces instruments procéduralisés [less ▲]

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See detailDesertification in the Sahel: climatic or human driven causes?
Ozer, Pierre ULg; Ozer, André ULg

Conference (2009, July 07)

Over the last decades, the Sahel of West Africa has suffered two dramatic contiguous droughts. Currently, and since the early 1990, rainfalls record an amelioration that tends towards the average of ... [more ▼]

Over the last decades, the Sahel of West Africa has suffered two dramatic contiguous droughts. Currently, and since the early 1990, rainfalls record an amelioration that tends towards the average of precipitation previous to the 1970s. However, this improvement may be due to increasing rainfall intensity and it seems that the length of the rainy season did not show any extension when compared to the 1970s and 1980s. On the other hand, the Sahelian population has been multiplied by 3 since 1950 and is foreseen to be multiplied by 10 by the second half of the 21st century. Increasing urban population levels are much more impressive and conduct important environmental distresses every day. Such increasing human pressure leads to uncontrolled deforestation in order to satisfy the needs in fuel wood, wood for construction and shifting cultivation. In addition, always larger herds for contracting range conditions lead to overgrazing and trampling. All these processes provoke the degradation of the vegetation cover, a constant diminution of crop yields, as well as a strong reduction of the biodiversity. One of the numerous consequences is the reactivation of previously fixed dunes that were formed during the last interpluvial phase (18000 BP). Our research provides a state of the art of recent findings and controversy that surround the desertification processes and concludes that if the droughts of the 1970s and 1980s have had dramatic consequences for the population of the Sahel, current and coming increasing human pressure will very likely enhance desertification processes of the southern fringe of the Sahara. [less ▲]

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See detailEnzymatic modifications of sugar in supercritical carbon dioxide
Favrelle, Audrey ULg; Brognaux, Alison ULg; Debuigne, Antoine ULg et al

Poster (2009, July 07)

Carbohydrates esters are non-ionic surfactants that have a wide range of commercial applications in cosmetic, food and pharmaceutical industry. They are produced from renewable and inexpensive raw ... [more ▼]

Carbohydrates esters are non-ionic surfactants that have a wide range of commercial applications in cosmetic, food and pharmaceutical industry. They are produced from renewable and inexpensive raw materials, are bio-degradable and non-toxic. Chemical synthesis of sugar esters is generally performed at a high temperature in the presence of an alkaline catalyst lead-ing to a mixture of products. In this respect, the corresponding enzyme-catalyzed processes in non-conventional media are more selective. For this purpose, lipases are the most useful enzymes. Moreover, supercritical carbon dioxide (SC-CO2) constitutes an interesting alternative to the organic solvents used in the domain as it is considered to be environmentally frien-dlier and safer. For example, its use reduces the contamination of the final products with residual solvents. This property is particularly valued in food, cosmetic and pharmaceutical industry. Our work consists to carry out lipase catalyzed sugar modifications in SC-CO2 and to compare the results with those obtained in organic solvents. The effect of these two different media on the enzyme stability and the yield will be described here. Moreover, the impact of various factors such as pressure, temperature, enzyme form (free or immobilized), use of co-solvent, on the course of the sugar esterification will be discussed. [less ▲]

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See detailTherapeutic projects in Belgium : a post-bureaucratic way
Schoenaers, Frédéric ULg; Cerfontaine, Gaëtan ULg

Conference (2009, July 07)

Since the end of the 1980s, a new vision of mental health has been developed under the influence of the Belgian "Psychiatry" permanent work group of the National Council of Hospital Facilities. This new ... [more ▼]

Since the end of the 1980s, a new vision of mental health has been developed under the influence of the Belgian "Psychiatry" permanent work group of the National Council of Hospital Facilities. This new vision adopts a holistic perspective which takes into account the diversity of factors at stake and aims to give a central place to the patient and his or her needs. The principles on which this innovative vision lies fall within an international trend (among other developed in the WHO declaration of Helsinki) which aims to put the patient at the centre of the system but also in field actor practices. This vision is made concrete in a restructuring of mental health care sector in terms of care circuits and networks, which necessitates an "interinstitutional" and interdisciplinary cooperation. With this approach the old bureaucratic model of organising a sector would be replaced by a post-bureaucratic one marked by notions such as networking or negotiation. The "Therapeutic projects", organised by a Royal Decree in 2006 after a long term decision making process, constitute the experimental phase of this new mental health care concept. It is a wide ranging pilot project which aims to achieve, by the end of the three-year experimental phase, the definition of guidelines and the implementation of norms as regards mental health care circuits and networks. The purpose of this contribution is to (1) give a presentation of the mechanisms which have lead to the creation and implementation of the therapeutic project. Using a case study method, we will also (2) analyse the functioning of a therapeutic project, showing at the one hand the tensions between the philosophy of the project (network functioning and flexibility) and the technocratic temptation developed by the administration which funds them, and, at the other hand, we will also examine how the "traditional" psychiatric rationality is able to maintain its central position in a context where other fields and actors should emerge. Finally, (3) as the data that we present have been collected during a FP6 integrated research project which aims to analyse the links between (new forms of) knowledge and policy making, we will develop a methodological discussion about the way sociology (of law) can trace the place and role of knowledge in policy making." [less ▲]

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See detailRI48 in very early AD
Adam, Stéphane ULg; Salmon, Eric ULg

Conference (2009, July 06)

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See detailLe film exposé : Retour(s), reprise(s), surprise(s)
Thonon, Jonathan ULg

Conference (2009, July 05)

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See detailVoice Feminization in case of gender reassignment: effect of Wendler glottopasty
Remacle, Marc; Morsomme, Dominique ULg; Lawson, George

in Journal of Voice (2009, July 04)

Summary: Objectives. The aim of this study was to evaluate the objective voice results ofWendler’s glottoplasty in male-to-female transsexuals. Method. We retrospectively reviewed our patients treated ... [more ▼]

Summary: Objectives. The aim of this study was to evaluate the objective voice results ofWendler’s glottoplasty in male-to-female transsexuals. Method. We retrospectively reviewed our patients treated with Wendler’s technique with minor modifications. Glottoplasty consisted in CO2-laser epithelial ablation of the anterior commissure and the two vocal folds in anterior third, suturing of the two vocal folds with two stitches of 3.0 resorbable thread, and application of fibrin sealant to strengthen the suture. Voice assessment was based mainly on fundamental frequency (F0), frequency range, jitter, maximum phonation time, phonation quotient, estimated subglottic pressure (ESGP) grade of dysphonia (G), and voice handicap index (VHI). These measures were taken before surgery and on the last follow-up visit. Results. Our series included 15 patients with a mean age of 36 years. The mean follow-up period was 7.2 months.We did not observe any early complications related to the technique. The comparison between the preoperative and the postoperative measurements, using Wilcoxon signed rank test, showed a significant improvement of median F0 from 139 to 191 Hz (P ¼ 0.006) with an increase in the grade of dysphonia (Gpre ¼ 0.2, Gpost ¼ 1, P ¼ 0.013) and ESGP (ESGPpre ¼ 8.1 ± 3.2, ESGPpost ¼ 12.0 ± 3.8, P ¼ 0.002). Other measurements, including VHI, did not show any significant differences pre- and postoperatively. Conclusion. Wendler’s glottoplasty can contribute to feminize the voice. [less ▲]

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See detailUnderstanding the Mechanism of Amyloid Fibrils Formation by Human Lysozyme
Dumoulin, Mireille ULg

Conference (2009, July 04)

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See detailDynamic analysis and preliminary design of twin-cylinder engines for clean propulsion systems
Louvigny, Yannick ULg; Vanoverschelde, Nicolas; Janssen, Guy et al

Conference (2009, July 02)

Facing environmental and energy challenges, automotive industry has to improve the fuel economy of vehicles and to reduce their polluting emissions. In this particular context, small twin-cylinder engines ... [more ▼]

Facing environmental and energy challenges, automotive industry has to improve the fuel economy of vehicles and to reduce their polluting emissions. In this particular context, small twin-cylinder engines regain interest for using in urban cars or as prime movers in hybrid electric cars. One difficulty with engine having few cylinders (three or less) comes from the balancing of the inertia forces created by the moving parts. Several models (from simple analytical model to complex flexible multibody simulation) of different configurations of twin-cylinder engine are developed. These models allow computing the inertia forces and moments generated by the engines and computing the strains and stresses of engine components. An important step is the engine balancing by modification of the crankshaft counterweights or by addition of balance shafts. The effect of the gas pressure on the balancing and on the component’s strains and stresses is also modelled. At the end, a comparison of the different configurations of twin-cylinder engine is provided [less ▲]

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See detailTemperature Adaptation of Proteins: Stability, Folding and Flexibility in Mesophilic-like Engineered Alpha-Amylases
Cipolla, Alexandre ULg; D'Amico, Salvino ULg; Feller, Georges ULg

Poster (2009, July 02)

Habitats of permanently cold temperature, like polar regions for example, have been colonized by a great variety of psychrophilic organisms producing enzymes adapted to function efficiently in these cold ... [more ▼]

Habitats of permanently cold temperature, like polar regions for example, have been colonized by a great variety of psychrophilic organisms producing enzymes adapted to function efficiently in these cold environments. According to the hypothesis developed in our laboratory, the adaptation to cold temperature involves relationships between activity, flexibility and stability. Even if activity and stability are not physically linked in proteins 1, the consensus for the adaptive strategy is to take advantage of the lack of selective pressure for stable proteins to lose stability, therefore increasing the flexibility or mobility of the enzyme at low temperatures that restrict molecular motions. 2 Working on alpha-amylase, we have investigated the role of weak interactions in thermal adaptation of proteins by site-directed mutagenesis. We have built two multiple-mutants (Mut5 and Mut5CC) of the psychrophilc alpha-amylase (AHA) from the Antarctic bacterium, Pseudoalteromonas haloplanktis. The single mutations were selected by comparison of the presence of weak interactions in a mesophilic chloride-dependant homolog from pig pancreas, PPA. The study of selected single mutations prompt us to construct two multiple-mutants, Mut5 and Mut5CC, carrying 5 and 6 additional weak interactions found in PPA, that showed an increased stability and a lower activity at 25 °C.3 We have compared AHA, Mut5 and Mut5CC with additional methods like differential scanning calorimetry, thermal and chemical unfolding and circular dichroism in order to determine the gain in stability. We also studied the flexibility or breathing of the enzymes by acrylamide-induced fluorescence quenching. The newly introduced weak interactions stabilized the proteins, protected them against heat and chemical unfolding and also induced an effective loss of flexibility. These results and those of the previous work 3, unambiguously support the capital role of weak interactions in the balance between activity, flexibility and stability and provide a better knowledge of the adaptation of enzymes to cold temperatures. [less ▲]

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See detailDiscriminating between overshooting and rotational mixing in massive stars: any help from asteroseismology?
Miglio, Andrea ULg; Montalban Iglesias, Josefa ULg; Eggenberger, P. et al

in Communications in Asteroseismology (2009, July 01), 158

Chemical turbulent mixing induced by rotation can affect the internal distribution of μ near the energy-generating core of main-sequence stars, having an effect on the evolutionary tracks similar to that ... [more ▼]

Chemical turbulent mixing induced by rotation can affect the internal distribution of μ near the energy-generating core of main-sequence stars, having an effect on the evolutionary tracks similar to that of overshooting. However, this mixing also leads to a smoother chemical composition profile near the edge of the convective core, which is reflected in the behavior of the buoyancy frequency and, therefore, in the frequencies of gravity modes. We show that for rotational velocities typical of main-sequence B-type pulsating stars, the signature of a rotationally induced mixing significantly perturbs the spectrum of gravity modes and mixed modes, and can be distinguished from that of overshooting. The cases of high-order gravity modes in Slowly Pulsating B stars and of low-order g modes and mixed modes in β Cephei stars are discussed. [less ▲]

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See detailBovine Leukemia Virus (BLV) could be subdivided into up to seven groups based on phylogenetic and similarity analyses of sequences from the env gene
Rodriguez, Sabrina ULg; Golemba, M.D.; Campos, R. et al

in AIDS Research and Human Retroviruses (2009, July 01), 25(11), 16

Bovine Leukemia Virus (BLV) Could be Subdivided into up to Seven Groups Based on Phylogenetic and Similarity Analyses of Sequences from the env Gene. Rodríguez, S.M., Trono, K., Jones, L.R., Golemba, M ... [more ▼]

Bovine Leukemia Virus (BLV) Could be Subdivided into up to Seven Groups Based on Phylogenetic and Similarity Analyses of Sequences from the env Gene. Rodríguez, S.M., Trono, K., Jones, L.R., Golemba, M., Campos, R. Instituto De Virología - Cicvya - Inta Castelar We sequenced the env gene from 28 BLV field strains from Argentina, and combined these sequences with 45 env sequences representing all the genetic groupings identified previously. These data were analyzed by phylogenetic analysis and similarity comparisons. Phylogenetic analyses showed the existence of five groups of sequences or genotypes. Four genotypes were supported by high bootstraps (89–100) and posterior probabilities (p=1.0), and the fifth one was supported by a high posterior probability (p=1.0) and moderate bootstrap (80–96) values. All these genotypes have one or more counterparts among the groupings identified previously, and thus many groups that were originally named differently correspond actually to the same genotype. Two sequences did not cluster with any other sequence, and were highly divergent when compared to the five groups mentioned above. This indicates that two extra genotypes could exist. The similarity comparisons were highly congruent with the phylogenetic analyses. The mean number of pair wise nucleotide substitutions between sequences from the same genotype was 11.1 (min. 6.5; max. 19), whereas it was 39.6 (min.36.8; max. 47.9) between sequences from different genotypes. Likewise, the mean number of amino acid substitutions in pair wise comparisons at the intra-genotype level was 3.3 (min. 0.4; max. 6.2), whereas it was 9.6 (min. 8.3; max. 13.5) at the inter-genotype level. Our analyses confirmed the existence of geographic clusters (p=6.838E-15, Chi2 test; p=4.583E-12, Fisher’s exact test). [less ▲]

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See detailEvidence for line-profile variability in the spectrum of the O supergiant HD 152249: preliminary results
Gosset, Eric ULg; Sana, H.; Linder, N. et al

in Communications in Asteroseismology (2009, July 01), 158

Already suspected to be variable, the O9Ib((f)) supergiant HD 152249 has been the subject of a dedicated follow-up spectroscopic run. We report here on the preliminary results. This star is definitely ... [more ▼]

Already suspected to be variable, the O9Ib((f)) supergiant HD 152249 has been the subject of a dedicated follow-up spectroscopic run. We report here on the preliminary results. This star is definitely exhibiting significant line-profile variations which are most probably a sign of the existence of non-radial pulsations. HD 152249 could thus belong to the newly identified group of pulsating OB supergiants. [less ▲]

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See detailLong-term treatment with valproic acid does not alleviate the condition of HAM/TSP
Olindo, S.; Belrose, G.; Lezin, A. et al

in AIDS Research and Human Retroviruses (2009, July 01), 25(11), 21

Long-Term Treatment with Valproic Acid Does Not Alleviate the Condition of HAM/TSP Olindo, S.,1 Belrose, G.,2 Lezin, A.,2 Gillet, N.,3 Defoiche, J.,4 Rodriguez, S.,4 Signaté, A.,1 Verlaeten, O.,4 Smadja ... [more ▼]

Long-Term Treatment with Valproic Acid Does Not Alleviate the Condition of HAM/TSP Olindo, S.,1 Belrose, G.,2 Lezin, A.,2 Gillet, N.,3 Defoiche, J.,4 Rodriguez, S.,4 Signaté, A.,1 Verlaeten, O.,4 Smadja, D.,1 Césaire, R.,2 Willems, L.4 1Service de Neurologie and JE 2503, Centre Hospitalier Universitaire de Fort-de-France, 97200 Fort-de-France, Martinique, France; 2Laboratoire de Virologie-Immunologie and JE 2503, Centre Hospitalier Universitaire de Fort-de-France, 97200 Fort-de-France, Martinique, France; 3Department of Immunology, Imperial College, London, UK; 4Molecular and Cellular Biology, University Academia ‘‘Wallonie-Europe’’, 5030 Gembloux, Belgium. LW is Research Director of the FNRS. We previously proposed to interfere with proviral loads in HAM/TSP patients by modulating lysine deacetylase activity using valproic acid (VPA). The strategy aims at activating viral gene expression in order to expose virus-positive cells to the host immune response. We conducted a single-center, two-year open-label trial, with 19 HAM/TSP volunteers treated with oral doses of VPA (20mg/Kg/day). Objectives were to assess biological response and clinical safety to VPA treatment in HAM/TSP patients. By microarray analysis, we show that VPA treatment moderately stimulated expression of cyclinD2 and Rho GTPase activating protein 18 in CD4-T cells. CD8-mediated lysis efficiency of Tax-expressing cells was unaltered by VPA treatment. The CD4-T cell turnover rate was calculated by GC/MS analysis from quantitative incorporation of deuterium into DNA. Transient increase in proviral loads correlated with accelerated proliferation. After 2 years, the proviral loads reached levels similar to those before treatment. The main clinical side effects were drowsiness (52%), tremor (47%), digestive symptoms (37%), vertigo (26%), and alopecia (10%). The frequency of side symptoms tended to decrease over the trial course. The neurological status over the study constituted the primary clinical safety measures. Disability Status Scale, muscle testing score, Ashworth score, and urinary dysfunction score showed no significant changes. Walking Time Test (WTT) slightly varied over the study except in 3 patients in whom the WTT variation rates were>20%. These 3 patients experienced drowsiness and tremor and improved rapidly after treatment discontinuation. Together, these observations indicated that long term treatment with VPA is safe but does not alleviate the condition of HAM/TSP. [less ▲]

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See detailSpectroscopic and photometric variability of O and Wolf-Rayet stars
Gosset, Eric ULg; Rauw, Grégor ULg

in Communications in Asteroseismology (2009, July 01), 158

Low-level line profile variability in the optical domain is a ubiquitous feature of O, Of and Wolf-Rayet type stars. This variability can arise from pulsations, from magnetic fields or wind structures ... [more ▼]

Low-level line profile variability in the optical domain is a ubiquitous feature of O, Of and Wolf-Rayet type stars. This variability can arise from pulsations, from magnetic fields or wind structures (both small and large scales). For main-sequence O-type stars, the spectra display many absorption lines that provide stringent diagnostics of photospheric features. However, as the stars evolve off the main-sequence towards the Of and Wolf-Rayet stage, the stellar wind densities (and hence the wind optical depths) increase dramatically. The wind eventually dominates the formation of the entire spectrum rendering the investigation of photospheric structures more ambiguous. We discuss the observational analyses of the spectroscopic and photometric variability of massive stars of spectral type O, Of and WR. In particular, we highlight the search for a connection between the photospheric and the wind variability. [less ▲]

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See detailLine profile variability in the massive binary HD 152219
Sana, H.; Gosset, Eric ULg

in Communication in Asteroseismology (2009, July 01), 158

HD 152219 is a massive binary system with O9.5 III and B1-2 III/V components and a short orbital period of 4.2 d. In a previous work, we showed that the primary star (M_{prim}˜21 M_&sun;) was presenting ... [more ▼]

HD 152219 is a massive binary system with O9.5 III and B1-2 III/V components and a short orbital period of 4.2 d. In a previous work, we showed that the primary star (M_{prim}˜21 M_&sun;) was presenting clear line profile variabilities (LPVs) that might be caused by nonradial pulsations (NRPs). In the present work, we report on an intensive spectroscopic monitoring, that aimed at unveiling the nature of the detected LPVs. Based on this new data set, we discard the NRPs and point out the Rossiter-McLaughlin effect as % being the cause of the observed LPVs. The upper limit derived on the amplitude of undetected NRPs, if any, is set at a couple of part per thousands of the continuum level. [less ▲]

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See detailBehavior of omega-3 fatty acids in eggs during cooking
Douny, Caroline ULg; El Khoury, Rawad ULg; Degand et al

Poster (2009, July 01)

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See detailUse of Organic Bases for 18F-Fluoride Anion Exchange Elution avoiding the Classical Azeotropic drying Step Before Labeling
Lemaire, Christian ULg; Aerts, Joël ULg; Voccia, Samuel et al

in Journal of Labelled Compounds & Radiopharmaceuticals (2009, July), 52(S1), 198

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See detailProgress in the asteroseismic analysis of the pulsating sdB star PG 1605+072
Van Grootel, Valérie ULg; Charpinet, Stéphane; Fontaine, Gilles et al

Conference (2009, July)

The hot pulsating sdB star PG 1605+072 exhibits uncommon spectroscopic and pulsation prop- erties, and is one of the biggest challenge in the field of sdB star modeling. Two hypotheses have been proposed ... [more ▼]

The hot pulsating sdB star PG 1605+072 exhibits uncommon spectroscopic and pulsation prop- erties, and is one of the biggest challenge in the field of sdB star modeling. Two hypotheses have been proposed to explain its unusually rich pulsation spectrum. The first is the natural explanation of a fast-rotating pulsator, which lifts the (2l+1)-fold degeneracy of the frequency components. Another approach, where PG 1605+072 can be seen as a slow rotator, considers that the numerous low amplitude frequency components are second- and third-order harmonics and nonlinear com- binations of the highest amplitude frequencies. We investigated the two hypotheses in the light of asteroseismology, using our latest tools - including pulsation codes that incorporate star rotation and new generation complete sdB models. The results of both approaches are presented, showing interesting results and raising new questions for our understanding of this mysterious sdB star. [less ▲]

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See detailSpatial distribution of accumulation in the Adélie Land - Comparison of the Antarctic GLACIOCLIM-SAMBA observation data with remote sensing techniques and high-resolution climate models
Agosta, Cécile ULg; Genthon, Christophe; Favier, Vincent et al

Conference (2009, July)

The Surface Mass Balance (SMB) of Antarctica is typically much larger within the first 200 km from the coast than further inland. This is also likely where much of the SMB change is expected due to ... [more ▼]

The Surface Mass Balance (SMB) of Antarctica is typically much larger within the first 200 km from the coast than further inland. This is also likely where much of the SMB change is expected due to climate warming. That is why since 2004 the GLACIOCLIM- SAMBA French observatory monitors the SMB in this region with spatial scales resolving those of climate models. A stakes line made of 91 stakes was deployed along a 150 km transect from the coast of Adélie Land towards Dome C on the plateau. This transect is surveyed each year and 3 complete records are now available. We first compare recent SMB measurements with older reports from the 1972-1992 period. We show that a significant fraction of the observed kilometer-scale spatial variability is stationary with time. Moreover the large spatial and inter-annual variabilities of recent measurements are consistent with the historical ones. The lateral spatial significance of the transect is then evaluated using the background remote-sensing- based model of Arthern et al. (2006). Finally, results from 3 high-resolution climate models are presented and compared with the field reports: the global atmosphere-surface climate model LMDZ4 zoomed to reach a 35 km resolution over Antarctica, the regional atmospheric climate model MAR developed for polar regions (20 km resolution) and the ECMWF analysis (50 km resolution). We show large differences between the 3 models, which don’t have the same ability to reproduce the meso-scale characteristics of the distribution of the observed SMB in the critical coast-to-plateau area. [less ▲]

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See detailAn item ixture model to detect differential item functioning
Frederickx, Sofie; Tuerlinckx, Francis; De Boeck, Paul et al

Conference (2009, July)

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See detailAnalysis of dynamic response of a very flexible Delta wing model in a wind tunnel
Barbason, Mathieu ULg; Andrianne, Thomas ULg; Hickey, Daryl ULg et al

in Proceedings of the 2009 International Forum on Aeroelasticity and Structural Dynamics (2009, July)

Limit cycle oscillations involving Delta wings are an important area of research in modern aeroelasticity. Such phenomena can be the result of geometric nonlin- earity, aerodynamic nonlinearity or under ... [more ▼]

Limit cycle oscillations involving Delta wings are an important area of research in modern aeroelasticity. Such phenomena can be the result of geometric nonlin- earity, aerodynamic nonlinearity or under-wing store nonlinearity. In this paper, a flexible half-Delta wing without stores is tested in a low speed wind tunnel in order to investigate its dynamic response. It is found that, at several combinations of airspeed and angle of attack, the wing undergoes high amplitude limit cycle oscillations. Three types of such oscillations are observed. Type 1 oscillations occur only at low angles of attack and are the result of a Hopf-type bifurcation. Type 2 limit cycle oscillations occur at intermedi- ate angles of attack and are the result of an atypical bifurcation. In other words, these oscillations appear as the airspeed is increased but disappear at even higher airspeeds. Type 3 oscillations occur at even higher angles of attack. A bispectrum analysis shows that type 3 limit cycle oscillations feature quadratic phase coupling. No such coupling was measured for type 2 oscillations, leading to the conclusion that the nonlinearity must be of higher order. [less ▲]

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