La présente étude vise à étudier le codage des pratiques linguistiques des jeunes issus de l'immigration algérienne en France. Notre objectif est de comprendre comment ces jeunes revendiquent leur appartenance socioculturelle et identitaire à travers l'utilisation du code-switching ? Comment la pratique du code-switching explique-t-elle leur double identité et leur identité socioculturelle ? Pour ce faire, nous avons, d'une part, réalisé une analyse lexicale d'un corpus de messages numériques écrits par ces jeunes, d'autre part, nous avons mené une enquête par questionnaire afin d'étudier leurs représentations. Les résultats obtenus ont montré que le code-switching permet aux jeunes issus de l'immigration algérienne non seulement de montrer leur particularisme mais aussi de revendiquer leur double identité socioculturelle et identitaire.

This work presents a numerical analysis of the dynamic behavior of reinforcements of liquefiable loose sand by flexible columns (stone columns) and Mixed Module Columns (CMM). In this study, the numerical simulation was carried out in 3D difference element analysis. Using a Finn model for dynamic Pore-Pressure Generation and the foundation subjected to the variable-amplitude harmonic ground motion of the Boumerdes earthquake (2003). When the height of the rigid part of the CMM has 50% of the column, the behavior of the improvement soil is the same by stone columns under the foundation, also the increase in the rigid part decreases the settlement. Overall, the high recorded accelerations by CMM indicate the largely preservation of the foundation stiffness

This work presents a numerical analysis of the dynamic behavior of reinforcements of liquefiable loose sand by flexible columns (stone columns) and Mixed Module Columns (CMM). In this study, the numerical simulation was carried out in 3D difference element analysis. Using a Finn model for dynamic Pore-Pressure Generation and the foundation subjected to the variable-amplitude harmonic ground motion of the Boumerdes earthquake (2003). When the height of the rigid part of the CMM has 50% of the column, the behavior of the improvement soil is the same by stone columns under the foundation, also the increase in the rigid part decreases the settlement. Overall, the high recorded accelerations by CMM indicate the largely preservation of the foundation stiffness

It is a challenging task to detect the hidden cracks in multilayer riveted structures in a nondestructive manner. This paper puts forward an eddy current nondestructive method for crack detection in such structures based on the electric conductivity of the rivets. Specifically, an eddy current sensor was designed with a ferrite core coil to evaluate the surface and inner defects of different layers. The magnetic phenomena during the detection process was simulated based on the magnetic potential and the scalar electrical potential, and the magnetic potential vector was solved by finite-element method. The proposed method was compared with the eddy current detection method without considering rivet conductivity through an experiment on a three-layer riveted aluminum structure. The length and position of each defect on each layer were changed in the experiment. The results show that the proposed method achieved better accuracy than the contrastive method, and its sensitivity depends on two issues: the position of the defect relative to the separation of the layers and the length of the defect relative to the length of the rivet head. The research results are of great significance for nondestructive testing of multilayer riveted structures in many fields.

It is a challenging task to detect the hidden cracks in multilayer riveted structures in a nondestructive manner. This paper puts forward an eddy current nondestructive method for crack detection in such structures based on the electric conductivity of the rivets. Specifically, an eddy current sensor was designed with a ferrite core coil to evaluate the surface and inner defects of different layers. The magnetic phenomena during the detection process was simulated based on the magnetic potential and the scalar electrical potential, and the magnetic potential vector was solved by finite-element method. The proposed method was compared with the eddy current detection method without considering rivet conductivity through an experiment on a three-layer riveted aluminum structure. The length and position of each defect on each layer were changed in the experiment. The results show that the proposed method achieved better accuracy than the contrastive method, and its sensitivity depends on two issues: the position of the defect relative to the separation of the layers and the length of the defect relative to the length of the rivet head. The research results are of great significance for nondestructive testing of multilayer riveted structures in many fields.

It is a challenging task to detect the hidden cracks in multilayer riveted structures in a nondestructive manner. This paper puts forward an eddy current nondestructive method for crack detection in such structures based on the electric conductivity of the rivets. Specifically, an eddy current sensor was designed with a ferrite core coil to evaluate the surface and inner defects of different layers. The magnetic phenomena during the detection process was simulated based on the magnetic potential and the scalar electrical potential, and the magnetic potential vector was solved by finite-element method. The proposed method was compared with the eddy current detection method without considering rivet conductivity through an experiment on a three-layer riveted aluminum structure. The length and position of each defect on each layer were changed in the experiment. The results show that the proposed method achieved better accuracy than the contrastive method, and its sensitivity depends on two issues: the position of the defect relative to the separation of the layers and the length of the defect relative to the length of the rivet head. The research results are of great significance for nondestructive testing of multilayer riveted structures in many fields.

It is a challenging task to detect the hidden cracks in multilayer riveted structures in a nondestructive manner. This paper puts forward an eddy current nondestructive method for crack detection in such structures based on the electric conductivity of the rivets. Specifically, an eddy current sensor was designed with a ferrite core coil to evaluate the surface and inner defects of different layers. The magnetic phenomena during the detection process was simulated based on the magnetic potential and the scalar electrical potential, and the magnetic potential vector was solved by finite-element method. The proposed method was compared with the eddy current detection method without considering rivet conductivity through an experiment on a three-layer riveted aluminum structure. The length and position of each defect on each layer were changed in the experiment. The results show that the proposed method achieved better accuracy than the contrastive method, and its sensitivity depends on two issues: the position of the defect relative to the separation of the layers and the length of the defect relative to the length of the rivet head. The research results are of great significance for nondestructive testing of multilayer riveted structures in many fields.

It is a challenging task to detect the hidden cracks in multilayer riveted structures in a nondestructive manner. This paper puts forward an eddy current nondestructive method for crack detection in such structures based on the electric conductivity of the rivets. Specifically, an eddy current sensor was designed with a ferrite core coil to evaluate the surface and inner defects of different layers. The magnetic phenomena during the detection process was simulated based on the magnetic potential and the scalar electrical potential, and the magnetic potential vector was solved by finite-element method. The proposed method was compared with the eddy current detection method without considering rivet conductivity through an experiment on a three-layer riveted aluminum structure. The length and position of each defect on each layer were changed in the experiment. The results show that the proposed method achieved better accuracy than the contrastive method, and its sensitivity depends on two issues: the position of the defect relative to the separation of the layers and the length of the defect relative to the length of the rivet head. The research results are of great significance for nondestructive testing of multilayer riveted structures in many fields.

It is a challenging task to detect the hidden cracks in multilayer riveted structures in a nondestructive manner. This paper puts forward an eddy current nondestructive method for crack detection in such structures based on the electric conductivity of the rivets. Specifically, an eddy current sensor was designed with a ferrite core coil to evaluate the surface and inner defects of different layers. The magnetic phenomena during the detection process was simulated based on the magnetic potential and the scalar electrical potential, and the magnetic potential vector was solved by finite-element method. The proposed method was compared with the eddy current detection method without considering rivet conductivity through an experiment on a three-layer riveted aluminum structure. The length and position of each defect on each layer were changed in the experiment. The results show that the proposed method achieved better accuracy than the contrastive method, and its sensitivity depends on two issues: the position of the defect relative to the separation of the layers and the length of the defect relative to the length of the rivet head. The research results are of great significance for nondestructive testing of multilayer riveted structures in many fields.

It is a challenging task to detect the hidden cracks in multilayer riveted structures in a nondestructive manner. This paper puts forward an eddy current nondestructive method for crack detection in such structures based on the electric conductivity of the rivets. Specifically, an eddy current sensor was designed with a ferrite core coil to evaluate the surface and inner defects of different layers. The magnetic phenomena during the detection process was simulated based on the magnetic potential and the scalar electrical potential, and the magnetic potential vector was solved by finite-element method. The proposed method was compared with the eddy current detection method without considering rivet conductivity through an experiment on a three-layer riveted aluminum structure. The length and position of each defect on each layer were changed in the experiment. The results show that the proposed method achieved better accuracy than the contrastive method, and its sensitivity depends on two issues: the position of the defect relative to the separation of the layers and the length of the defect relative to the length of the rivet head. The research results are of great significance for nondestructive testing of multilayer riveted structures in many fields.

Eddy Current Nondestructive Testing Calibration for Cracks Detection in Aircraft Based Riveted Multilayer Structures

Eddy Current Nondestructive Testing Calibration for Cracks Detection in Aircraft Based Riveted Multilayer Structures

Eddy Current Nondestructive Testing Calibration for Cracks Detection in Aircraft Based Riveted Multilayer Structures

Eddy Current Nondestructive Testing Calibration for Cracks Detection in Aircraft Based Riveted Multilayer Structures

Eddy Current Nondestructive Testing Calibration for Cracks Detection in Aircraft Based Riveted Multilayer Structures

Eddy Current Nondestructive Testing Calibration for Cracks Detection in Aircraft Based Riveted Multilayer Structures

Eddy Current Nondestructive Testing Calibration for Cracks Detection in Aircraft Based Riveted Multilayer Structures

Shrink/Swell soil displacements are the source of additional loadings on expansive soil buried structures such as pipelines. One of the most important factors, which control the swelling values, is the initial soil suction. Using finite element analysis, this paper aims to estimate the effect of the initial soil suction on the loadings provoked by the consequences of a rainfall. An infiltration of 2mm/day intensity and which lasts for 30 days (1 months) on the pipeline buried within the clayey soil, with taking into account the unsaturated behavior of the soil of the Aine-Tine area (Mila, Algeria) is considered. Five initial values of soil suction (from -50kPa to -800kPa) with double increment are used. The obtained results confirm that, the higher the initial soil suction, the higher are the effects, whether on the pipeline internal axial forces or on the soil heave.

Shrink/Swell soil displacements are the source of additional loadings on expansive soil buried structures such as pipelines. One of the most important factors, which control the swelling values, is the initial soil suction. Using finite element analysis, this paper aims to estimate the effect of the initial soil suction on the loadings provoked by the consequences of a rainfall. An infiltration of 2mm/day intensity and which lasts for 30 days (1 months) on the pipeline buried within the clayey soil, with taking into account the unsaturated behavior of the soil of the Aine-Tine area (Mila, Algeria) is considered. Five initial values of soil suction (from -50kPa to -800kPa) with double increment are used. The obtained results confirm that, the higher the initial soil suction, the higher are the effects, whether on the pipeline internal axial forces or on the soil heave.

Dans ce travail, nous présentons une étude numérique de la convection naturelle dans une enceinte rectangulaire verticale sans ou avec chicane. Les équations qui régissent ce phénomène ont été résolues par une approche numérique, basée sur la méthode des volumes finis en utilisant le code Fluent et le mailleur Gambit. Un premier travail de validation a été mené en comparant notre travail avec ceuxd’autres auteurs. Par la suite, on a fait varier le fluide de travail, la longueur et la position de chicane. L’influence de ces paramètres sur les champs de température, la densité de flux de chaleur et le nombre de Nusselt a été ainsi considérée et les conditions optimales quimaximalisent les transferts de chaleur déterminée