Browsing
     by title


0-9 A B C D E F G H I J K L M N O P Q R S T U V W X Y Z

or enter first few letters:   
OK
Peer Reviewed
See detailA perturbation technique for Finite Element Modelling of Piezoelectric Vibrations in Travelling Wave Ultrasonic Motors
Ledinh, T.; Dular, Patrick ULg; Gyselinck, J. et al

in Proceedings of the second international conference on advanced computational methods in engineering, ACOMEN 2002 (2002)

Detailed reference viewed: 6 (0 ULg)
Full Text
Peer Reviewed
See detailPerturbation technique for the finite element modelling of differential probes in non-destructive eddy-current testing
V Sabariego, Ruth ULg; Dular, Patrick ULg

in IET Science, Measurement & Technology (2007), 1(1), 25-29

The paper deals with a new finite element scheme for non-destructive eddy-current testing (ECT) problems involving multiply connected test pieces and differential probes. It concerns a perturbation ... [more ▼]

The paper deals with a new finite element scheme for non-destructive eddy-current testing (ECT) problems involving multiply connected test pieces and differential probes. It concerns a perturbation technique applied to the magnetodynamic h - phi formulation. The unperturbed field (in the absence of the flaw) is conventionally computed in the complete domain. The source of the perturbation problem is then determined by the projection of the unperturbed field in a relatively small region around the defect, the optimum size of which depends on the working frequency. The discretisation of this reduced domain is well adapted to the size of the defect and chosen independently of the dimensions of the excitation probe and the specimen under study. At a discrete level, the voltage change is efficiently computed by integration only over the defect and a layer of elements in the reduced domain that touches the defect's boundary. The accuracy of the proposed perturbation model is illustrated by comparison of the results obtained for different dimensions of the reduced domain with those achieved in the conventional way. The considered test case involves a differential probe scanning the outer surface of a metal tube for the detection of through-wall cracks. [less ▲]

Detailed reference viewed: 19 (2 ULg)
Full Text
See detailA perturbation technique for the finite element modelling of non-destructive eddy current testing
V Sabariego, Ruth ULg; Dular, Patrick ULg

in Electromagnetic Fields in Mechatronics, Electrical and Electronic Engineering (2006)

This paper deals with a new 3D finite element scheme for nondestructive eddy-current testing (ECT) problems. It concerns a perturbation technique applied to the magnetodynamic h- φ formulation. The ... [more ▼]

This paper deals with a new 3D finite element scheme for nondestructive eddy-current testing (ECT) problems. It concerns a perturbation technique applied to the magnetodynamic h- φ formulation. The unperturbed field (in the absence of the flaw) is computed conventionally in the complete domain. The source of the perturbation problem is determined by the projection of the unperturbed field in a relatively small region around the defect that depends on the work frequency. The discretisation of this reduced domain is adapted to the size of the defect and independent of the discretisation of the complete domain. The impedance change is computed by integrating only over the defect and a layer of elements in the reduced domain that touch its boundary. As test case, we consider the second eddy current benchmark problem proposed by the WFNDEC. It involves a pancake coil scanning the inner surface of a metal tube for the detection of flaws on the outer surface. [less ▲]

Detailed reference viewed: 13 (1 ULg)
Full Text
See detailPerturbations de la phosphorylation oxydative : réponses protéomiques et conséquences métaboliques
Mathy, Grégory ULg

Doctoral thesis (2009)

La phosphorylation oxydative et ses partenaires privilégiés, que sont les voies métaboliques énergétiques principales, sont finement régulés au niveau thermodynamique en vertu de la loi d’action des ... [more ▼]

La phosphorylation oxydative et ses partenaires privilégiés, que sont les voies métaboliques énergétiques principales, sont finement régulés au niveau thermodynamique en vertu de la loi d’action des masses. Ces processus de régulations enzymatiques s’accompagnent cependant de « soupapes » de sécurité qui permettent, le cas échéant, de maintenir de manière optimale la bonne opération de l’ensemble de ce système et donc d’assurer une balance metabolique adequate entre l’offre et la demande. Par une approche de protéomique comparée, nous avons étudiés les effets de ces différents types de stress tant au niveau mitochondrial que cellulaire afin de mettre en évidence d’éventuelles adaptations initiées par la cellule en réponse à ces perturbations Dans la première partie nous avons etudie les effets de l’oxydase alternative sur le protéome mitochondrial et cellulaire. La première etude consiste en une création de la fonction AOX au niveau mitochondrial dans un organisme modèle ne l’exprimant pas naturellement : Saccharomyces cerevisiae. Deux approches protéomiques ont été utilisees, à savoir le 2D DIGE et le SILAC. La seconde étude concernant AOX consiste en l’analyse des effets d’une perte de fonction de la protéine obtenue par ARN interférence chez l’algue unicellulaire Chlamydomonas reinhardtii. La seconde partie de notre travail sera consacrée à l’étude des modifications protéomiques accompagnant l’initiation de la thermogenèse non frissonnante ainsi que l’acclimatation au froid au niveau du tissu adipeux brun. Cette étude à été réalisée chez le rat et chez la souris. Les effets de l’acclimatation au froid chez des souris UCP-1 KO ont ete aussi étudiés et comparés aux effets chez des souris normales. [less ▲]

Detailed reference viewed: 145 (42 ULg)
Full Text
Peer Reviewed
See detailPerturbations endocriniennes et polluants environnementaux
Charlier, Corinne ULg

in Revue Médicale de Liège (2006)

Detailed reference viewed: 21 (3 ULg)
See detailPerturbations endocriniennes liées aux polluants environnementaux
Charlier, Corinne ULg

Conference (2009)

Detailed reference viewed: 34 (10 ULg)
Full Text
Peer Reviewed
See detailPerturbations neuropsychiques graves chez un jeune adolescent soumis à une thérapeutique endocrinienne
Servais, Jean-François; Mormont, Christian ULg; Bostem, F. et al

in Acta Psychiatrica Belgica (1976), 76(1), 97-106

After a treatment based on the administration of gonadotropic drugs, aimed at reduced school difficulties and caracterial difficulties by a premature onset of puberty, a young male aged 13 1/2 presents: 1 ... [more ▼]

After a treatment based on the administration of gonadotropic drugs, aimed at reduced school difficulties and caracterial difficulties by a premature onset of puberty, a young male aged 13 1/2 presents: 1 degree somatic anomalies; 2 degrees increase of intellectual, affective and behavioral troubles; 3 degrees perturbations of EEG prophiles; 4 degrees organicity tests significantly disturbed. The interruption of treatment (4 years of observation) was followed by a progressive remission, however heterogenous, of all initial troubles. The observation underlines the dangers of utilising these treatments in a pre-puberty boy. [less ▲]

Detailed reference viewed: 7 (0 ULg)
See detailPerturbations of the Earth evolutions by intense energetics particule precipitations
Gérard, Jean-Claude ULg; Hauglustaine, Didier A.

Report (1987)

Detailed reference viewed: 5 (1 ULg)
Full Text
See detailPerturbations récentes dans le Bassin du Congo : Contribution de l’anthracologie à une restitution paléoenvironnementale
Morin-Rivat, Julie ULg; Hubau, Wannes; Gillet, Jean-François et al

Poster (2012, May 22)

Detailed reference viewed: 136 (20 ULg)
Full Text
Peer Reviewed
See detailPerturbative evolution and Regge behaviour
Cudell, Jean-René ULg; Donnachie, A.; Landshoff, P. V.

in Physics Letters B (1999), 448

Detailed reference viewed: 16 (1 ULg)
Full Text
Peer Reviewed
See detailPerturbative QCD
Ivanov, Igor ULg

in Naumov, Dmitry; Vall, Alexander (Eds.) Proceedings of the X Baikal Summer School On Physics Of Elementary Particles And Astrophysics (2011)

These lectures, intended mainly for undergraduates, contain a very short introduction into perturbative QCD. We introduce the QCD lagrangian, outline how QCD is quantized and renormalized, and as an ... [more ▼]

These lectures, intended mainly for undergraduates, contain a very short introduction into perturbative QCD. We introduce the QCD lagrangian, outline how QCD is quantized and renormalized, and as an example describe the calculation of the elastic two-gluon scattering. We then discuss the physics behind the parton model of hadron collisions, with the important issues of the infrared safety and factorization. We end with a short description of how different hadronic final states are searched for and studied at hadron colliders. [less ▲]

Detailed reference viewed: 12 (0 ULg)
Full Text
See detailPerturbative QCD corrections to the soft pomeron
Cudell, Jean-René ULg; Margolis, B.

in MRST Meeting 1992 (1992)

Detailed reference viewed: 7 (1 ULg)
See detailThe Perturbed Generalized Proximal Point Algorithm
Alexandre, Patrick; Nguyen, Van Hien; Tossings, Patricia ULg

E-print/Working paper (1996)

During the last years, different modifications were introduced in the proximal point algorithm developed by R.T. Rockafellar for searching a zero of a maximal monotone operator on a real Hilbert space. We ... [more ▼]

During the last years, different modifications were introduced in the proximal point algorithm developed by R.T. Rockafellar for searching a zero of a maximal monotone operator on a real Hilbert space. We combine these modifications to get a new version of this algorithm. We take simultaneously into account a variable metric, a perturbation and a kind of relaxation. Our work takes place in the context of the variational convergence theory. [less ▲]

Detailed reference viewed: 11 (0 ULg)
Peer Reviewed
See detailThe Perturbed Generalized Proximal Point Algorithm
Alexandre, Patrick; Nguyen, Van Hien; Tossings, Patricia ULg

in RAIRO : Modélisation Mathématique et Analyse Numérique (Mathematical Modelling and Numerical Analysis) (1998), 32(2), 223-253

During the last years, different modifications were introduced in the proximal point algorithm devloped by R.T. Rockafellar for searching a zero of a maximal monotone operator on a real Hilbert space. We ... [more ▼]

During the last years, different modifications were introduced in the proximal point algorithm devloped by R.T. Rockafellar for searching a zero of a maximal monotone operator on a real Hilbert space. We combine these modifications to get a new version of this algorithm. We take simultaneously into account a variable metric, a perturbation and a kind of relaxation. Our work takes place in the context of the variational convergence theory. [less ▲]

Detailed reference viewed: 5 (0 ULg)
Peer Reviewed
See detailThe Perturbed Proximal Point Algorithm and Some of its Applications
Tossings, Patricia ULg

in Applied Mathematics & Optimization (1994), 29(2), 125-159

Following the works of R.T. Rockafellar, to search for a zero of a maximal monotone operator, and of B. Lemaire, to solve convex optimization problems, we present a perturbed version of the proximal point ... [more ▼]

Following the works of R.T. Rockafellar, to search for a zero of a maximal monotone operator, and of B. Lemaire, to solve convex optimization problems, we present a perturbed version of the proximal point algorithm. We apply this new algorithm to convex optimization and to variational inclusions or, more particularly, to variational inequalities. [less ▲]

Detailed reference viewed: 2 (0 ULg)
See detailPerturbed Proximal Point Algorithm with Nonquadratic Kernel
Brohé, Myrana; Tossings, Patricia ULg

E-print/Working paper (1998)

Let H be a real Hilbert space and T be a maximal monotone operator on H. A well-known algorithm, developed by R.T. Rockafellar, for solving the problem "To find x in H such that 0 in Tx" is the proximal ... [more ▼]

Let H be a real Hilbert space and T be a maximal monotone operator on H. A well-known algorithm, developed by R.T. Rockafellar, for solving the problem "To find x in H such that 0 in Tx" is the proximal point algorithm. Several generalizations have been considered by several authors: introduction of a perturbation, introduction of a variable metric in the perturbed algorithm, introduction of a pseudo-metric in place of the classical regularization, ... We summarize several of these extensions by taking into account a pseudo-metric as regularization and a perturbation in an inexact version of the algorithm. [less ▲]

Detailed reference viewed: 9 (0 ULg)
Peer Reviewed
See detailPerturbed Proximal Point Algorithm with Nonquadratic Kernel
Brohé, Myrana; Tossings, Patricia ULg

in Serdica Mathematical Journal (2000), 26

Let H be a real Hilbert space and T be a maximal monotone operator on H. A well-known algorithm, developed by R.T. Rockafellar, for solving the problem "To find x in H such that 0 in Tx" is the proximal ... [more ▼]

Let H be a real Hilbert space and T be a maximal monotone operator on H. A well-known algorithm, developed by R.T. Rockafellar, for solving the problem "To find x in H such that 0 in Tx" is the proximal point algorithm. Several genaralizations have been considered by several authors: introduction of a perturbation, introduction of a variable metric in the perturbed algorithm, introduction of a pseudo-metric in place of the classical regularization, ... We summarize some of these extensions by taking into account a pseudo-metric as regularization and a perturbation in an inexact version of the algorithm. [less ▲]

Detailed reference viewed: 13 (1 ULg)
Peer Reviewed
See detailThe Perturbed Tikhonov's Algorithm and Some of its Applications
Tossings, Patricia ULg

in RAIRO : Modélisation Mathématique et Analyse Numérique (Mathematical Modelling and Numerical Analysis) (1994), 28(2), 189-221

The proximal point algorithm has known these last years many developments connected with the expansion of the variational convergence theory. Motivated by this fact and inspired by the work of A. Tikhonov ... [more ▼]

The proximal point algorithm has known these last years many developments connected with the expansion of the variational convergence theory. Motivated by this fact and inspired by the work of A. Tikhonov and V. Arsénine in the context of convex optimization, we present a new algorithm for searching a zero of a maximal monotone operator on a real Hilbert space. We study the perturbed version of this algorithm and establish a critical comparison with the perturbed proximal point algorithm. We apply this new algorithm to convex optimization and to variational inclusions or, more particularly, to variational inequalities. [less ▲]

Detailed reference viewed: 7 (2 ULg)
See detailThe Perturbed Tikhonov's Algorithm with Nonquadratic Kernel and some of its Applications
Brohé, Myrana; Tossings, Patricia ULg

E-print/Working paper (2001)

Detailed reference viewed: 12 (0 ULg)