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See detailOn the motion of trapped particles in the vicinity of corotation centers
Beaugé, C.; Lemaitre, Anne; Jancart, Sylvie ULg

in Ferraz-Mello, S. (Ed.) Impact of Modern Dynamics in Astronomy (1999)

In this presentation we revisit the analytical determination of the corotation solutions of the restricted planar three-body problem under the effects of a Stokes drag. Previous calculations by different ... [more ▼]

In this presentation we revisit the analytical determination of the corotation solutions of the restricted planar three-body problem under the effects of a Stokes drag. Previous calculations by different authors, and using different external dissipative forces, have always shown significant quantitative errors of the models with respect to the numerical values. Up to date no concrete explanation has been obtained for this discrepancy. We show that the origin of these errors lies not only in the modelization of the gravitational forces (i.e. disturbing function) but in the averaging process of the variational equations. A second-order averaging is developed based on a Lie transform method (Kamel, 1969). With it we can calculate new equilibrium solutions with a greatly improved accuracy. In a second part, this same perturbation method is applied to study the periodic orbits (i.e. limit cycles) which describe the motion of the particles around the averaged corotational solutions. We show how analytical approximations of these cycles can be obtained through the inverse transformation of the averaging process itself. In all cases, we present comparisons with numerical simulations of the exact equations. [less ▲]

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See detailL’apoptose mammaire dans le sein normal et en pathologie
DESREUX, Joëlle ULg; GOFFIN, Frédéric ULg; BELIARD, Aude ULg et al

in Références en Gynécologie Obstétrique (1999), 6

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See detailMise au point d'un test d'évaluation gestuelle du patient lombalgique
Vanderthommen, Marc ULg; DEFAWEUX, Michel ULg; TOMASELLA, Marco ULg et al

in Revue de la Société Belge des Ecoles du Dos (1999)

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See detailMémoire de travail et lobes frontaux
Collette, Fabienne ULg; Andrès; Van der Linden, Martial ULg

in Van der Linden, Martial; Le Gall, Didier; Seron, Xavier (Eds.) et al Neuropsychologie des lobes frontaux (1999)

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See detailCapture for coorbital moons
Champenois, Sylvain; Henrard, Jacques; Jancart, Sylvie ULg

Poster (1999)

See detailThe free movement of persons living with HIV/AIDS
Carlier, Jean-Yves ULg

Book published by OPOCE (1999)

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See detailIntérêt d'une procédure de rappel indicé à 48 items dans le diagnostic précoce de la maladie d'Alzheimer
Ivanoiu, Adrian; Adam, Stéphane ULg; Béchet, Sophie et al

in Revue Neurologique (1999), 155

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See detailReproducibility of measurements of potential doubling time of tumour cells in the multicentre National Cancer Institute protocol
COUCKE, Philippe ULg; Paschoud, N; Pavy, J-J et al

in British Journal of Cancer (1999)

We compared the flow cytometric measurement and analysis of the potential doubling time ( Tpot) between three centres involved in the National Cancer Institute (NCI) protocol T92-0045. The primary purpose ... [more ▼]

We compared the flow cytometric measurement and analysis of the potential doubling time ( Tpot) between three centres involved in the National Cancer Institute (NCI) protocol T92-0045. The primary purpose was to understand and minimize the variation within the measurement. A total of 102 specimens were selected at random from patients entered into the trial. Samples were prepared, stained, run and analysed in each centre and a single set of data analysed by all three centres. Analysis of the disc data set revealed that the measurement of labelling index (LI) was robust and reproducible. The estimation of duration of S-phase ( Ts) was subject to errors of profile interpretation, particularly DNA ploidy status, and analysis. The LI dominated the variation in Tpot such that the level of final agreement, after removal of outliers and ploidy agreement, reached correlation coefficients of 0.9. The sample data showed poor agreement within each of the components of the measurement. There was some improvement when ploidy was in agreement, but correlation coefficients failed to exceed values of 0.5 for Tpot. The data suggest that observer-associated analysis of Ts and tissue processing and tumour heterogeneity were the major causes of variability in the Tpot measurement. The first two aspects can be standardized and minimized, but heterogeneity will remain a problem with biopsy techniques. [less ▲]

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See detailElectron-microscopic tomography of silver-stained interphase and metaphase nucleolar organizer regions
Cheutin, T; O'Donohue, M-F; Kaplan, H et al

Poster (1999)

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See detailEtude d'un réseau cyclable à Liège
Hanocq, Philippe ULg; Piron, Frédéric; Occhiutto, Rita

in Croughs, Roger; Jacobs, Chantal; Guillaume, Michèle (Eds.) Communes cyclistes ? Ca existe ! ... Quelsques pistes pour promouvoir l'usage du vélo dans votre commune (1999)

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See detailInternational laws: collecting, transporting and ownership of fossils - Belgium.
Gerrienne, Philippe ULg

in Jones, T.P.; Rowe, N.P. (Eds.) Fossil Plants and Spores: Modern Techniques. (1999)

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See detailThe relationship between diversity profiles, evenness and species richness based on partial ordering
Rousseau, R; Van Hecke, P; Nijssen, D et al

in Environmental and Ecological Statistics (1999), 6(2), 211-223

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