Search results for "unilateral"

Nonsmooth Mechanics. Convex and Nonconvex Problems

1999

Nonlinear, multivalued and possibly nonmonotone relations arise in several areas of mechanics. A multivalued or complete relation is a relation with complete vertical branches. Boundary laws of this kind connect boundary (or interface) quantities. A contact relation or a locking mechanism between boundary displacements and boundary tractions in elasticity is a representative example. Material constitutive relations with complete branches connect stress and strain tensors, or, in simplified theories, equivalent stress and strain quantities. A locking material or a perfectly plastic one is represented by such a relation. The question of nonmonotonicity is more complicated. One aspect concerns…

HeterozygousFGF8mutations in patients presenting cryptorchidism and multiple VATER/VACTERL features without limb anomalies

2014

Background The acronym VATER/VACTERL association describes the combination of at least three of the following cardinal features: vertebral defects, anorectal malformations, cardiac defects, tracheoesophageal fistula with or without esophageal atresia, renal malformations, and limb defects. Although fibroblast growth factor-8 (FGF8) mutations have mainly found in patients with Kallmann syndrome, mice with a hypomorphic Fgf8 allele or complete gene invalidation display, aside from gonadotropin-releasing hormone deficiency, parts or even the entire spectrum of human VATER/VACTERL association. Methods We performed FGF8 gene analysis in 49 patients with VATER/VACTERL association and 27 patients …

Unanimismo democrático

2005

BIEM-based variational principles for elastoplasticity with unilateral contact boundary conditions

1998

The structural step problem for elastic-plastic internal-variable materials is addressed in the presence of frictionless unilateral contact conditions. Basing on the BIEM (boundary integral equation method) and making use of deformation-theory plasticity (through the backward-difference method of computational plasticity), two variational principles are shown to characterize the solution to the step problem: one is a stationarity principle having as unknowns all the problem variables, the other is a saddle-point principle having as unknowns the increments of the boundary tractions and displacements, along with the plastic strain increments in the domain. The discretization by boundary and i…

The symmetric boundary element method for unilateral contact problems

2008

Abstract On the basis of the boundary integral equation method, in its symmetric formulation, the frictionless unilateral contact between two elastic bodies has been studied. A boundary discretization by boundary elements leads to an algebraic formulation in the form of a linear complementarity problem. In this paper the process of contact or detachment is obtained through a step by step analysis by using generalized (weighted) quantities as the check elements: the detachment or the contact phenomenon may happen when the weighted traction or the weighted displacement is greater than the weighted cohesion or weighted minimum reference gap, respectively. The applications are performed by usin…

L'agrément des fédérations sportives n'est plus un acte réglementaire

2017

International audience

Efectos de un programa de entrenamiento de fuerza unilateral o bilateral sobre el rendimiento en gestos de fuerza velocidad y la asimetría bilateral …

2015

La capacidad de manifestar fuerza se revela fundamental para el rendimiento en gran cantidad de modalidades deportivas. En el futbol la capacidad de acelerar, decelerar, saltar o cambiar de dirección es un elemento importante para el rendimiento en la acción de juego (Hoff y Helgerund, 2004; Stolen, Chamari, Castagna, Wisloff, 2005; Bangsbo, Mohr, Krustrup,2006). Estas acciones están sustentadas en la manifestación de altos niveles de fuerza y potencia por parte del miembro inferior. Al diseñar un programa de intervención para la mejora de la manifestación de fuerza, la manipulación adecuada de las distintas variables que componen el programa de entrenamiento se revela fundamental para cons…

Functional reorganization of the attentional networks in low-grade glioma patients: a longitudinal study.

2015

International audience; Right brain damage often provokes deficits of visuospatial attention. Although the spatial attention networks have been widely investigated in stroke patients as well as in the healthy brain, little is known about the impact of slow growing lesions in the right hemisphere. We here present a longitudinal study of 20 patients who have been undergoing awake brain surgery with per-operative line bisection testing. Our aim was to investigate the impact of tumour presence and of tumour resection on the functional (re)organization of the attention networks. We assessed patients' performance on lateralized target detection, visual exploration and line bisection before surger…

The middle house or the middle floor: Bisecting horizontal and vertical mental number lines in neglect

2007

Abstract This study explores the processing of mental number lines and physical lines in five patients with left unilateral neglect. Three tasks were used: mental number bisection (‘report the middle number between two numbers’), physical line bisection (‘mark the middle of a line’), and a landmark task (‘is the mark on the line to the left/right or higher/lower than the middle of the line?’). We manipulated the number line orientation purely by task instruction: neglect patients were told that the number-pairs represented either houses on a street (horizontal condition) or floors in a building (vertical condition). We also manipulated physical line orientation for comparison. All five negl…

Hyperexcitability of parietal-motor functional connections in the intact left-hemisphere of patients with neglect

2008

Hemispatial neglect is common after unilateral brain damage, particularly to perisylvian structures in the right-hemisphere (RH). In this disabling syndrome, behaviour and awareness are biased away from the contralesional side of space towards the ipsilesional side. Theoretical accounts of this in terms of hemispheric rivalry have speculated that the intact left-hemisphere (LH) may become hyper-excitable after a RH lesion, due to release of inhibition from the damaged hemisphere. We tested this directly using a novel twin-coil transcranial magnetic stimulation (TMS) approach to measure excitability within the intact LH of neglect patients. This involved applying a conditioning TMS pulse ove…