Liste des documents
Improving the Power Quality of the Arc WeldingSupply using an Active Power Filter
This paper presents a new circuit topology suitablefor arc welding inverter applications, this topology is based onshunt active power filter (APF), in order to improve the powerquality and reduced the total harmonic distortion (THD) byconsequently improve the power factor (PF), a modified... Voir les détails
Mots clés : arc welding, Active power filter (APF), power factor (PF), total harmonic distortion (THD), modified active and reactive method (p-q)
Video Processing Software-based Pipeline Endoscopic Inspection
Currently, all the codes and the standards of the fluids transport industries require rigorous pipeline inspection, in order to detect all defects and anomalies and avoid leaks and failures. For this reason, a team within the division of Signal Processing and Imagery had as mission to develop an... Voir les détails
Mots clés : Pipeline inspection, endoscopy, video processing, video segmentation, corrosion.
Study and modelling of a microwave sensor tocharacterize a dielectric materials and for CNDapplications
Non-destructive testing is a science of evaluationvarious properties of materials, without compromising itsusefulness and use. These properties can be physical, chemical,mechanical or geometrical. There are several techniques of nondestructive testing such as: acoustic emission, penetrate... Voir les détails
Mots clés : Non-Destructive testing, Microwave Techniques, HFSS, Microwave Sensor, Dielectric Constant, Micro strip Modelling, moment method
Characterization of local mechanical behavior of TA6V weld sheet
The present work aims to study the local mechanical behavior of TA6V weld sheet. To this purpose, X-ray Diffraction (XRD), optical microscopy and nano-indentation measurements have been employed. The results highlight strong relationship between the hardness (HIT), Young’s modulus (EIT)... Voir les détails
Mots clés : TA6V, Nanoindentation, Microhardness, microstructure.
Evaluating the Flicker caused byElectric Arc Furnacethrough the Multi-scale Entropy MSE Algorithm SampEn
This paper presents a new method to evaluate the Arc voltage quality in electric arc furnace (EAF). It has been shown that is possible to allow the representation of nonlinear dynamics and coupling effects between different waves for irregularity of electrical signals issued by electrical... Voir les détails
Mots clés : Entropy, Arc voltage signals quality, Flicker effect, voltage imbalance
Performance of some Variational ImplicitDeformable Models on Segmenting OpticalMicroscopy Images
Industrial micrographs are used to evaluate a steelsor alloys. This assessment consists of visualizing and describingthe basic element (at the nanoscale) constituting the material.The information provided by the micrographic images needto be highlighted by image processing methods. In this... Voir les détails
Mots clés : Material microstructures, Microscopy images, segmentation, deformable models, region-based active contours
Synthesis and characterization of Nickel oxide (NiO) thin films
For the synthesis of Nickel oxide as thin films, with the spray pyrolysis technical as a chemical method of deposit, on ordinary glass substrates heated to a fixed temperature of 500 °C. we use Nickel nitrate hexahydrate (99.5 %, Aldrich) as source precursor, dissolved in distilled water. Nickel... Voir les détails
Mots clés : NiO, Raman, UV-Visible Spectroscopy, XDR
The influence of scale yielding conditions in the determination of the fracture load using both analytical and numerical approaches for the study of the elasto-static anti-plane problem of a crack in a semi-infinite strip containing a non-homogeneous zone
The elasto-static anti-plane problem of a crack in a semi-infinite strip containing a non-homogeneous zone was studied using two approaches. The first one consist on an analytical approach based on the solution of a Singular Integral Equation (SIE formulation) using the Dugdale-Barenblatt... Voir les détails
Mots clés : Crack, Singular Integral Equation, FEM, cohesive models, scalCrack, scale yielding conditions
Qualitative and Quantitative Assessment of γ and δ Phases in Duplex Stainless Steel Weldments by the X-Ray Diffraction Technique
This paper is focused on the quantitative and qualitative characterization of austenitic-ferritic stainless steel welds by the X-ray diffraction technique. The first weldment realized by gas tungsten arc welding process GTAW with ER2209 electrode, the second weldment by shielded metal arc welding... Voir les détails
Mots clés : welding, X-ray diffraction technique, duplex stainless steel, ferrite and austenite
Simulation and Modeling of Uncertainties in the Calibration of a Fluorescence Chemical Spectrometer (FRX)
Sensitivity analysis and uncertainty estimation are of major importance for the declaration of conformity of finished products. Models must be sought to analyze the test data. The main objective of this work is to establish reliable models to analyze our experimental data and validate them. So... Voir les détails
Mots clés : Simulation; uncertainties; Monte carlo; Bootstrap; calibration