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See detailValidation of MIPAS HNO3 operational data
Wang, D. Y.; Hopfner, Michael; Blom, C. E. et al

in Atmospheric Chemistry and Physics (2007), 7(18), 4905-4934

Nitric acid (HNO3) is one of the key products that are operationally retrieved by the European Space Agency (ESA) from the emission spectra measured by the Michelson Interferometer for Passive Atmospheric ... [more ▼]

Nitric acid (HNO3) is one of the key products that are operationally retrieved by the European Space Agency (ESA) from the emission spectra measured by the Michelson Interferometer for Passive Atmospheric Sounding (MIPAS) onboard ENVISAT. The product version 4.61/4.62 for the observation period between July 2002 and March 2004 is validated by comparisons with a number of independent observations from ground-based stations, aircraft/balloon campaigns, and satellites. Individual HNO3 profiles of the ESA MIPAS level-2 product show good agreement with those of MIPAS-B and MIPAS-STR (the balloon and aircraft version of MIPAS, respectively), and the balloon-borne infrared spectrometers MkIV and SPIRALE, mostly matching the reference data within the combined instrument error bars. In most cases differences between the correlative measurement pairs are less than 1 ppbv (5-10%) throughout the entire altitude range up to about 38 km (similar to 6 hPa), and below 0.5 ppbv (15-20% or more) above 30 km (similar to 17 hPa). However, differences up to 4 ppbv compared to MkIV have been found at high latitudes in December 2002 in the presence of polar stratospheric clouds. The degree of consistency is further largely affected by the temporal and spatial coincidence, and differences of 2 ppbv may be observed between 22 and 26 km (similar to 50 and 30 hPa) at high latitudes near the vortex boundary, due to large horizontal inhomogeneity of HNO3. Similar features are also observed in the mean differences of the MIPAS ESA HNO3 VMRs with respect to the ground-based FTIR measurements at five stations, aircraft-based SAFIRE-A and ASUR, and the balloon campaign IBEX. The mean relative differences between the MIPAS and FTIR HNO3 partial columns are within +/- 2%, comparable to the MIPAS systematic error of similar to 2%. For the vertical profiles, the biases between the MIPAS and FTIR data are generally below 10% in the altitudes of 10 to 30 km. The MIPAS and SAFIRE HNO3 data generally match within their total error bars for the mid and high latitude flights, despite the larger atmospheric inhomogeneities that characterize the measurement scenario at higher latitudes. The MIPAS and ASUR comparison reveals generally good agreements better than 10-13% at 20-34 km. The MIPAS and IBEX measurements agree reasonably well (mean relative differences within +/- 15%) between 17 and 32 km. Statistical comparisons of the MIPAS profiles correlated with those of Odin/SMR, ILAS-II, and ACE-FTS generally show good consistency. The mean differences averaged over individual latitude bands or all bands are within the combined instrument errors, and generally within 1, 0.5, and 0.3 ppbv between 10 and 40 km (similar to 260 and 4.5 hPa) for Odin/SMR, ILAS-II, and ACE-FTS, respectively. The standard deviations of the differences are between 1 to 2 ppbv. The standard deviations for the satellite comparisons and for almost all other comparisons are generally larger than the estimated measurement uncertainty. This is associated with the temporal and spatial coincidence error and the horizontal smoothing error which are not taken into account in our error budget. Both errors become large when the spatial variability of the target molecule is high. [less ▲]

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See detailMicro-entreprises in rural areas : redeployment of rurality in Walloon Region
Brulard, Cécile; Burny, Philippe ULg; Dogot, Thomas ULg et al

in 18th European Seminar on Extension Education "Supporting viable rural communities" : proceedings, September 2007 (2007)

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See detailPraktisches Verfahren zur Bemessung von Brückenseilen und -hängern zur Vermeidung Regen-Wind-induzierter Schwingungen
Denoël, Vincent ULg; Hortmanns, Michael; Sedlacek, Gerhard

in Stahlbau (2007), 76(2), 126-130

Rain-wind induced vibrations have been widely studied during the last decades. Today it is desirable to use the experience gathered in this field in order to develop a practical design procedure offering ... [more ▼]

Rain-wind induced vibrations have been widely studied during the last decades. Today it is desirable to use the experience gathered in this field in order to develop a practical design procedure offering both security and economy. After a restricted review of some analytical models, this paper points out the need for a semi-empirical method if the complexity of this design procedure has to be kept at its minimum. Based on measured data collected during field tests and wind tunnel experiments, a new proposal is suggested. [less ▲]

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See detailL'assiette du Belge en chiffres
Duquesne, Brigitte ULg

Poster (2007)

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See detailA systems biology perspective of apoptosis signalling
Bullinger, Eric ULg

Conference (2007)

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See detailQuarante ans de céréaliculture en Belgique : évolution des superficies, des rendements et du nombre d’exploitations
Burny, Philippe ULg

in Faculté universitaire des Sciences agronomiques de Gembloux; Centre wallon de Recherches agronomiques (Eds.) 40 ans Livre blanc Céréales-Gembloux "Economie de la production céréalière en Belgique : évolution en 40 ans de Politique Agricole Commune et perspectives d’avenir" (2007)

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See detailMeiotic segregation analysis in cow heterozygotes for the t(1;29) Robertsonian translocation
Bonnet-Garnier, A; Lacaze, S; Beckers, Jean-François ULg et al

in Chromosome Research : An International Journal on the Molecular, Supramolecular and Evolutionary Aspects of Chromosome Biology (2007), 15(2), 87

Heterozygotes for Robertsonian translocations have usually a normal phenotype but show variable decrease in fertility. In humans, meiotic segregation studies carried out in male carriers reveal a majority ... [more ▼]

Heterozygotes for Robertsonian translocations have usually a normal phenotype but show variable decrease in fertility. In humans, meiotic segregation studies carried out in male carriers reveal a majority of balanced spermatozoa. The rate of unbalanced segregation products appears higher in females than in males, but the number of human oocytes analysed so far remains limited (about 100). The occurrence of the t(1;29) translocation in several cattle breeds makes bovines an interesting animal model to study the meiotic segregation in female carrier of Robertsonian translocations. The aim of our project is thus to assess the rates of unbalanced oocytes produced by four cows and to compare these values with those obtained in bulls carriers of the same translocation. The superstimulated cows were subjected to twenty um pick up (OPU) sessions. Dual colour whole chromosome painting probes for BTA1 and 29 were hybridized on oocytes preparations. To date, 649 oocytes have been matured in vitro and 500 successfully spread. Among the 266 oocytes analysed by FISH so far: 201 (75,5%) are balanced, including 105 translocated and 96 normal, 55 are diploid (20.7%), and 10 unbalanced (3.8%). The proportion of balanced oocytes is lower than the average proportion of balanced spermatozoa estimated for two heterozygous bulls (97.1%). This difference is essentially due to a higher rate of diploid oocytes (20.7% vs 0.04% diploid spermatozoa). The origin of observed differences in the segregation profiles of the two sexes, as well as the practical implications of these results for genetic counselling and cattle breeding are discussed. [less ▲]

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See detailL'oeuvre du temps. Réflexion sur la conservation et la restauration d'objets d'art
Verbeeck, Muriel ULg

in Images re-vues. Histoire, anthropologie et théorie de l'art (2007), 4

Interroger l'objet, c'est aussi, au-delà de sa forme ou de son sens, interroger le temps — notre rapport à l'origine, au passé ou au devenir. Nulle part cependant, cette question ne se pose de façon plus ... [more ▼]

Interroger l'objet, c'est aussi, au-delà de sa forme ou de son sens, interroger le temps — notre rapport à l'origine, au passé ou au devenir. Nulle part cependant, cette question ne se pose de façon plus cruciale que dans l'acte de conserver ou restaurer l'objet d'art : car l’intervention le situe dans un champ de valeurs parfois hétéroclites. C’est au travers de l’axiologie que prennent corps des pratiques conservatives ou restauratives différenciées. Le praticien devient par conséquent, au sens propre, un « enseignant » : il donne sens aux signes, il éduque notre regard à l'objet préservé dans son authenticité et nous apprend à l’écouter respectueusement. [less ▲]

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See detailCascade high volume hemofiltration : Preliminary data in septic shock patients
WIESEN, Patricia ULg; MONCHI, Mehran; DUBOIS, Bernard ULg et al

in Blood Purification (2007), 25

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See detailDiagnostic et pronostic du patient en état végétatif
Vanhaudenhuyse, Audrey ULg

Scientific conference (2007)

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See detailZéro
Durand, Pascal ULg

in Durand, Pascal (Ed.) Les Nouveaux Mots du Pouvoir. Abécédaire critique (2007)

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See detailMultisegmented radiation therapy as an alternative to 3D conformal radiation therapy, with special reference to breast cancer tangential fields
GULYBAN, Akos ULg; Kovacs, P.; Farkas, R. et al

in Nowotwory (2007), 57(3), 291-293

The paper compares the techniques of 3DCRT and MSCRT in terms of PTV coverage and doses to OARs. The study population consisted of 175 breast cancer patients in whom treatement was analysed in regard to ... [more ▼]

The paper compares the techniques of 3DCRT and MSCRT in terms of PTV coverage and doses to OARs. The study population consisted of 175 breast cancer patients in whom treatement was analysed in regard to the use of lateral and medial tangential fields. Although we have failed to establish statistical significance at the P=0.05 levelthe results look clinically promising in favour of MSCRT. [less ▲]

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See detailPrevention of hip fractures in osteoporosis
Neuprez, Audrey ULg; Hiligsmann, Mickaël ULg; Bruyère, Olivier ULg et al

in Minerva Ortopedica e Traumatologica (2007), 58(5), 423-437

Hip fracture is the major clinical consequence of osteoporosis. It is linked with decreased life expectancy and quality of life, placing an ever increasing burden on health services. Few medications have ... [more ▼]

Hip fracture is the major clinical consequence of osteoporosis. It is linked with decreased life expectancy and quality of life, placing an ever increasing burden on health services. Few medications have unequivocally demonstrated their ability to reduce hip fracture risk in osteoporotic subjects. Daily alendronate and risedronate reduce hip fracture in patients with low bone mineral density and prevalent vertebral fractures. Intravenous bisphosphonates have been developed, in response to long-term poor adherence to oral anti-osteoporotic treatments. Once-yearly zoledronic acid reduces fracture rates at the spine, non-spine and hip locations. Strontium ranelate, the first drug to uncouple bone formation from bone resorption has also demonstrated its ability to reduce hip fractures in patients above 74 years old, with prevalent low bone mineral density. Calcium and vitamin D supplementation are prerequisite for the management of elderly subjects and should always been associated to anti-resorptive or bone forming agents. Non-pharmacological management of osteoporosis is recommended cannot be considered a substitute for pharmacological treatment of osteoporosis, not even in old age. [less ▲]

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See detailWhole body vibration in the treatment of fibromyalgia: Influence on muscle performances
Maquet, Didier ULg; Helene, Loic; Demoulin, Christophe ULg et al

in Isokinetics & Exercise Science (2007), 15

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See detailThe Asian Crisis Exchange Risk Exposure of U.S. Multinationals
Muller, Aline ULg; Verschoor, Willem

in Managerial Finance (2007), 33(9), 710-740

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See detailMobility and home-range use of Atlantic salmon parr over short time scales
Ovidio, Michaël ULg; Enders, Eva C.; Hallot, Eric ULg et al

in Aquatic Living Resources (2007), 20(1, JAN-MAR), 95-101

This study performed in the Patapedia River (Quebec, Gaspesie) was designed to examine the space utilization and mobility patterns of individual Atlantic salmon parr over short time scales with frequent ... [more ▼]

This study performed in the Patapedia River (Quebec, Gaspesie) was designed to examine the space utilization and mobility patterns of individual Atlantic salmon parr over short time scales with frequent detections of position. In August 2004, n = 7 radio-tagged Atlantic salmon parr were located every 20 min during 10 tracking periods chosen to take into account the dawn, day, dusk and night periods. Parr showed important inter individual variability in space utilization and mobility patterns, occupying large home ranges (123 to 5602 m(2)) and sometimes migrating 2 km upstream in the river. No differences were observed in the mean distance travelled among the four daily periods by individual fish, but the estimated home ranges utilized during the four daily periods overlapped only partially, demonstrating that parr partly occupy different areas of the river during different parts of the daily cycle. The results suggest that an intense survey on a small number of fish may contribute to a complementary comprehension of space utilization and mobility patterns of Atlantic salmon parr when viewed in association with results from studies surveying larger number of fish at lower frequency. [less ▲]

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