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See detailUsing passive nonlinear targeted energy transfer to stabilize drill-stringsystems
Viguié, Régis ULg; Kerschen, Gaëtan ULg; Golinval, Jean-Claude ULg et al

in Mechanical Systems & Signal Processing (2009), 23

Torsional vibrations of drill strings used in drilling oil and gas wells arises from a complex interaction of the dynamics of the drilling structure with speed-dependent effective rock-cutting forces ... [more ▼]

Torsional vibrations of drill strings used in drilling oil and gas wells arises from a complex interaction of the dynamics of the drilling structure with speed-dependent effective rock-cutting forces. These forces are often difficult to model, and contribute substantially to the instability problems of controlling the drilling operation so as to produce steady cutting. In this work we show how nonlinear passive targeted energy transfer to a lightweight attachment can be used to passively control these instabilities. This is performed by means of a nonlinear energy sink (NES), a lightweight attachment which has been shown to be effective in reducing or even completely eliminating self-excited motions in aeroelastic and other systems. The NES is a completely passive, inherently broadband vibration absorber capable of attracting and dissipating vibrational energy from the primary structure to which it is attached, in this case a nonlinear discontinuous model of a drill-string system. In this paper we describe a prototypical drill string-NES system, briefly discuss some of the analytical and computational tools suitable for its analysis, and then concentrate on mathematical results on the efficacy of the NES in this application and their physical interpretation. [less ▲]

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See detailPoints de repère pour prévenir la maltraitance
Bullens, Quentin ULg; Debluts, Danielle; Dubois, Françoise et al

Learning material (2008)

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See detailCerebral correlates of false memories and illusory recollection after sleep and sleep deprivation.
Darsaud, A.; Dehon, Hedwige ULg; et al.

Poster (2008, May)

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See detailSCAR-MarBIN, the Antarctic marine biodiversity information network.
Danis, Bruno; et al.; Dauby, Patrick ULg et al

Poster (2007, April 12)

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See detailAstroPoles : Astronomy from the Polar Plateaus; The astronomy program for the International Polar Year
Burton, M.; et al.; Surdej, Jean ULg et al

Poster (2006, August)

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See detailInformation Technology - Enhancements to LOTOS (E-LOTOS)
Leduc, Guy ULg; et al.

Report (2001)

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See detailLibérer les savoirs. La vie, l'école, l'action
Havelange, Carl ULg; et al.

in Groupe de recherche Quart monde/université (Ed.) Le croisement des savoirs. Quand le quart-monde rencontre l'université (1999)

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See detailChanges in the Chemical composition of the atmosphere
Adams, F.; Colin, R. G.; De muer, D. et al

Report (1997)

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See detailDepressed Immune Surveillance against Cancer: Role of Deficient T Cell: Extracellular Matrix Interactions
Gorski, A.; Castronovo, Vincenzo ULg; Stepien-Sopniewska, B. et al

in Cell Adhesion and Communication (1994), 2(3), 225-33

Although T cells infiltrate malignant tumors, the local immune response is usually inefficient and tumors escape destruction. While extracellular matrix proteins strongly costimulate T cell responses in ... [more ▼]

Although T cells infiltrate malignant tumors, the local immune response is usually inefficient and tumors escape destruction. While extracellular matrix proteins strongly costimulate T cell responses in normal individuals, our studies indicate that peripheral blood T cells from cancer patients and tumor infiltrating cells respond poorly or are resistant to stimulative signals mediated by collagen I and IV and fibronectin. Moreover, the adhesive properties of cancer T cells are markedly depressed. Those functional deficiencies are paralleled by variable deficits in integrin and non-integrin T cell receptors for extracellular matrix. Immunotherapy with BCG causes a dramatic but transient increase in T cell: ECM interactions. [less ▲]

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See detailL'ingénieur et son art. Défi de la R&D et défi du marché
Vankerkem, Michel; Claustriaux, Jean-Jacques ULg; et al.

in Gestion 2000 (1994), 4

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See detailRapport d'activité 1990-1991
Claustriaux, Jean-Jacques ULg; et al.

Report (1992)

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See detailCell Surface Receptors in Lymphoid Cells: From Cytochemistry to Molecular Biology and from a Phenotype to a Function
Boniver, Jacques ULg; Courtoy, R.; Schaaf-Lafontaine, Nicole ULg et al

in Progress in Histochemistry and Cytochemistry (1992), 26(1-4), 169-81

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