<?xml version="1.0" encoding="UTF-8"?><feed xmlns="http://www.w3.org/2005/Atom" xmlns:dc="http://purl.org/dc/elements/1.1/">
<title>Doctorat en Chimie</title>
<link href="http://dspace.univ-chlef.dz/handle/123456789/1439" rel="alternate"/>
<subtitle/>
<id>http://dspace.univ-chlef.dz/handle/123456789/1439</id>
<updated>2026-04-05T22:05:04Z</updated>
<dc:date>2026-04-05T22:05:04Z</dc:date>
<entry>
<title>ÉTUDE D’UN SYSTÈME DE DÉPOLLUTION D’EFFLUENTS DE L’INDUSTRIE TEXTILE PAR UN PROCÉDÉ COUPLANT ADSORPTION ET ÉLECTROCATALYSE HÉTÉROGÈNE</title>
<link href="http://dspace.univ-chlef.dz/handle/123456789/2396" rel="alternate"/>
<author>
<name>OUAGUED, Imane</name>
</author>
<id>http://dspace.univ-chlef.dz/handle/123456789/2396</id>
<updated>2026-02-23T08:06:06Z</updated>
<published>2026-01-01T00:00:00Z</published>
<summary type="text">ÉTUDE D’UN SYSTÈME DE DÉPOLLUTION D’EFFLUENTS DE L’INDUSTRIE TEXTILE PAR UN PROCÉDÉ COUPLANT ADSORPTION ET ÉLECTROCATALYSE HÉTÉROGÈNE
OUAGUED, Imane
Ce travail propose une solution durable et économiquement viable pour traiter la&#13;
pollution de l'eau par les colorants synthétiques, réputés pour leur persistance et leur toxicité,&#13;
en couplant l'adsorption avec les Procédés Electrochimiques d'Oxydation Avancée (PEOA). La&#13;
Rhodamine B (RhB), un colorant modèle toxique, a été sélectionnée pour cette étude. Deux&#13;
matériaux carbonés ont été utilisés, feutre de carbone (FC) utilisé comme cathode et charbon&#13;
actif (disque Brita®) choisi pour sa forte capacité d'adsorption et son double rôle d'adsorbant et&#13;
d'électrode (cathode). Les anodes étaient en titane platiné (Ti/Pt) ou en oxyde de titane sousstœchiométrique.&#13;
Les résultats démontrent que le barbotage d'air comprimé est aussi efficace que&#13;
l'oxygène pur pour le procédé Electro-Fenton (EF), tout en étant plus économique. La cinétique&#13;
de dégradation est accélérée avec l'augmentation de la densité de courant, les constantes de&#13;
vitesse étant plus élevées pour l'Oxydation Anodique (OA) et le procédé couplé EF/OA que&#13;
pour l'EF seul. La concentration initiale en RhB influence fortement cette cinétique, une faible&#13;
concentration favorisant une dégradation plus rapide. Le suivi de la toxicité par le test&#13;
Microtox® a révélé une réduction notable, particulièrement marquée par le procédé EF/OA.&#13;
L'efficacité de minéralisation, évaluée par l'abattement du Carbone Organique Total (COT),&#13;
atteint 90,4 % pour EF/OA, contre 83,4 % pour OA et 68,3 % pour EF, avec une consommation&#13;
énergétique plus faible pour le procédé couplé. L'analyse UHPLC-HRMS a identifié des&#13;
intermédiaires de dégradation, confirmant une voie dominante par N-déséthylation.&#13;
Parallèlement, l'étude d'adsorption a montré que le FC est peu adsorbant, contrairement au&#13;
charbon actif dont l'efficacité dépend du pH, du temps de contact, de la masse et de la&#13;
concentration initiale. Les modèles cinétiques et isothermes (Freundlich) indiquent une&#13;
adsorption multicouche sur une surface hétérogène. Ces propriétés adsorbantes ont été&#13;
exploitées pour le couplage de procédés, en pré-concentrant le polluant à la surface de&#13;
l'électrode. L’utilisation du charbon actif a ainsi permis d'optimiser la dégradation&#13;
électrochimique tout en réduisant les coûts énergétiques.&#13;
En conclusion, ces résultats apportent une approche prometteuse pour le traitement des&#13;
effluents textiles, combinant efficacement les avantages de l'adsorption et des PEOA et ouvrent&#13;
des perspectives intéressantes pour la dépollution de l'environnement.
</summary>
<dc:date>2026-01-01T00:00:00Z</dc:date>
</entry>
<entry>
<title>Damage to Metallic Materials- Study project on techniques and early detection of SCC in stainless steels Type 304L Control of initiation and propagation of SCC cracks</title>
<link href="http://dspace.univ-chlef.dz/handle/123456789/2073" rel="alternate"/>
<author>
<name>KESSAL, BELKACEM AMINE</name>
</author>
<id>http://dspace.univ-chlef.dz/handle/123456789/2073</id>
<updated>2025-05-29T08:36:55Z</updated>
<published>2025-01-01T00:00:00Z</published>
<summary type="text">Damage to Metallic Materials- Study project on techniques and early detection of SCC in stainless steels Type 304L Control of initiation and propagation of SCC cracks
KESSAL, BELKACEM AMINE
This thesis proposes to establish an empirical study between the microstructure and the&#13;
electrochemical and mechanical behavior of welded joints in austenitic stainless steels AISI304L&#13;
as well as the early detection of SCCs and the control of the initiation and propagation of SCC&#13;
cracks.&#13;
This work is a continuation of research carried out in the field of improving the resistance&#13;
of pipelines to corrosion. It aims to identify the welding parameters of 304l steel by electric arc&#13;
(TIG) on the corrosion of welded joints in particular in the HAZ. To do this, welded samples&#13;
were taken with different parameters on which mechanical and electrochemical tests were&#13;
carried out to demonstrate the behavior of this zone in a corrosive environment similar to&#13;
seawater (30 g / l).&#13;
Using an experimental design based on the FED method, we estimated the contribution of&#13;
the experimental factors (welding parameters) :( Number of passes, argon gas flow rate and the&#13;
welding current) as well as the microstructure through the welded joint on corrosion behavior.&#13;
The comparative study between welding joints due to their corrosion resistance shows better&#13;
resistance to stress corrosion of AISI 304L.
THESIS&#13;
Presented for obtaining a diploma of&#13;
DOCTORAT&#13;
Field : Chemistry&#13;
Specialty: Security, Reliability and Enhancement Of Gas Pipelines
</summary>
<dc:date>2025-01-01T00:00:00Z</dc:date>
</entry>
<entry>
<title>Influence of geometrical defects of the blades of turbine and pipelines: numerical study</title>
<link href="http://dspace.univ-chlef.dz/handle/123456789/1536" rel="alternate"/>
<author>
<name>BOUKORTT, Hocine</name>
</author>
<id>http://dspace.univ-chlef.dz/handle/123456789/1536</id>
<updated>2021-01-26T09:41:33Z</updated>
<published>2020-01-01T00:00:00Z</published>
<summary type="text">Influence of geometrical defects of the blades of turbine and pipelines: numerical study
BOUKORTT, Hocine
Withstanding of the gas turbine for the elongations is a major consideration in their design because they are subjected to high tangential, axial and centrifugal forces during their working conditions. Several authors have been suggested for the better enhancement of conception, thermal, mechanical and metallurgic properties of blades to withstand these extreme conditions. The damage severely of gas turbine due to the failure of blade, the observation showed that a serious pitting was occurred on the blade surfaces and there were evidences of fatigue marks in the fracture surface We also studied the corrosion of the gas pipe caused by the hydrogen from the high pressure of the turbine. The failure of the blade in a gas turbine was investigated a fracture mechanical study by a numerical analysis. In this study, we used a blade of a gas turbine, with a same shape, and we modified the crack size. In this analysis, the applied pressure is not constant, whereas is imported with an interaction between structure/fluid.&#13;
So, we used ANSYS® Workbench 16.0 software with the computational fluid dynamics Software (CFD section), a steady state gas flow analysis was carried out, and the pressure distributions. This pressure across the blade is obtained and we mapped these results on the other section of it APDL (ANSYS® Parametric Design Language) section. In the structural analysis a node coordinate where we have the maximum principal stresses were explored. In this node, we have created a semi-elliptical crack and we have compared between them with the Stress Intensity Factors and T-stress values. The second parameter in the Williams' equation give a good information’s on the estimation and the direction of the crack path in the part two we will study Hydrogen play a decisive role in many future energy systems. For these reasons, many researchers have been performed to see the effect of hydrogen on natural gas network.
</summary>
<dc:date>2020-01-01T00:00:00Z</dc:date>
</entry>
<entry>
<title>CORROSION AND SCALE GREEN INHIBITORS ON CORROSION EFFECTS ON THE FRACTURE MECHANICS PROPERTIES OF GAS PIPELINES</title>
<link href="http://dspace.univ-chlef.dz/handle/123456789/1440" rel="alternate"/>
<author>
<name>SOUDANI, MOHAMED</name>
</author>
<id>http://dspace.univ-chlef.dz/handle/123456789/1440</id>
<updated>2020-10-18T08:22:11Z</updated>
<published>2019-02-12T00:00:00Z</published>
<summary type="text">CORROSION AND SCALE GREEN INHIBITORS ON CORROSION EFFECTS ON THE FRACTURE MECHANICS PROPERTIES OF GAS PIPELINES
SOUDANI, MOHAMED
The degradation of metal structures in pipelines can caused accidents. Some studies and research,&#13;
indicate in the field oil and gas industry, that the effects of acidic chemical cleaning solution to an&#13;
important role in the process of internal corrosion. In this context we performed an inspection of a&#13;
corroded gas pipe by metallographic analyzes. Then we studied the mechanical behavior of the pipe in&#13;
the presence and absence of green corrosion inhibitors (Ruta Chalepensis '' FIDJILE '') and synthetic.&#13;
Two pipe grades were studies API X52 and API X65 mechanical tests were performed by Charpy test,&#13;
Drop weight test, three point bending test and tensile test.
</summary>
<dc:date>2019-02-12T00:00:00Z</dc:date>
</entry>
</feed>
