Evolution of antimicrobial resistance of Salmonella isolates from pigs in Belgium

The aim of the present study was to investigate the antimicrobial sensitivity of Salmonella isolates from pigs between 2011 and 2015. In total, 275 Salmonella isolates from samples originating from pigs sent in for diagnostic examination at Animal Health Care Flanders were tested for their sensitivity against different antimicrobials. Except for colistin, where the disk prediffusion test was used, the disk diffusion test was used. E. coli ATCC 25922 was used as reference isolate and the interpretative breakpoints were based on the Clinical and Laboratory Standards Institute

Displacement and rotation fields measurement using Finite Element Stereo Digital Image Correlation

International audienceThe aim of this study is to measure, with stereo digital image correlation (DIC), the displacements and rotations at the boundary of a plate subjected to complex loadings. With classical DIC techniques, the measured field is the displacement of the upper skin only. The rotations are usually estimated a posteriori by numerical differentiation and filtering. Unfor-tunately additional uncertainties mayarise with these steps. Conversely, the use of a finite element model is proposed here to regularize a stereo FE-DIC measurement. For that a for-mulation of the DIC problem using the 3D displacement as primary unknown is used

Finite Element Stereo Digital Image Correlation Measurement for a Plate Model

International audienceIn this study, a Stereo Digital Image Correlation method is used to measure boundary conditions for a plate model. For a plate model, boundary conditions are displacements but also rotations. For instance, the rotations can be obtained by a posteriori numerical differentiation. Since the measured displacement is noisy, filtering or smoothing techniques are required even if they usually do not consider the mechanical nature of the measured field. In this work, a plate Finite Element model is preferred to regularise the Stereo DIC measurement. Classically [Horn and Schunck (1981), Sutton et al. (1983)], the optical flow problem is written in a weak form over a region called Region of Interest (ROI) which is usually defined by a subset of the reference state image. For one increment of Stereo DIC [Garcia et al. (2002)], two image registrations are performed independently. Both correlation problems involve unknowns that are not directly related to the physical (3D) displacement U calculated after triangulation and 3D shape variation. The stereo DIC problem is reformulated in the world reference system so as to have U as a unique unknown. It is therefore possible to add a mechanical regularization [Roux et al, (2009), Rethore 10, Leclerc et al, (2011)] to this dedicated measurement and to measure directly displacements and rotations. The long-term goal is to perform multiscale identification following the approach [Passieux et al, (2015)] in 2D-DIC

Mechanically regularized Finite Element Stereo DIC: framework and application for structural testings

International audienceThe aim of this study is to measure, with stereo digital image correlation (DIC), the displacements and rotations at the boundary of a plate subjected to complex loadings. With classical DIC techniques, the measured field is the displacement of the upper skin only. The rotations are usually estimated a posteriori by numerical differentiation and filtering. Unfortunately additional uncertainties may arise with these steps. In this work, a finite element model is proposed to regularize a stereo FE-DIC measurement. For that, a complete framework of the DIC problem using the 3D displacement as primary unknown is developped. The approach can handle as many cameras as necessary and encompasses the calibration

A Global Formulation to Stereo Digital Image Correlation with Mechanical Regularisation

International audienceThe aim of this study is to measure, with stereo digital image correlation, the displacements and rotations at the boundary of a plate subjected to complex loadings. With classical DIC techniques, the measured field is the displacement of the upper skin only. The rotations are usually estimated a posteriori by numerical differentiation and smoothing. Unfortunately additional uncertainties may arise with these steps. Conversely, the use of a finite element model is proposed here to regularise a stereo FE-DIC measurement. For that a formulation using the 3D displacement as primary unknown is introduced. It requires projection operators based on a pinhole camera model. It is shown that it is possible to take into account distortions directly. Associated to this formulation a more accurate quadrature technique is used avoiding a systematic bias

Measurement of regularised boundary conditions on a composite plate with Stereo Digital Image Correlation

International audienceno abstrac

Measurement of regularised boundary conditions on a composite plate with Stereo Digital Image Correlation

International audienceno abstrac

The VERTEX program: complex loading and validation of aeronautic composite structures

International audienceno abstrac

Evolution of antimicrobial resistance of Salmonella isolates from pigs in Belgium

The aim of the present study was to investigate the antimicrobial sensitivity of Salmonella isolates from pigs between 2011 and 2015. In total, 275 Salmonella isolates from samples originating from pigs sent in for diagnostic examination at Animal Health Care Flanders were tested for their sensitivity against different antimicrobials. Except for colistin, where the disk prediffusion test was used, the disk diffusion test was used. E. coli ATCC 25922 was used as reference isolate and the interpretative breakpoints were based on the Clinical and Laboratory Standards Institute.</p