Liste des Mémoires de Master

Nombre total de résultats : 61
Pertinence Titre A-Z Plus récents Plus anciens
10 25 50
Année de publication

Développement d’un Biomatériau à Base de Polymère etRenfort Végétale

H. DAMOUS  (2021)
Mémoire de Master

In the last few years, there has been a strong interest in the development of biodegradablepolymers as an alternative for many applications. This is in order to reduce the largeconsumption of plastic causing environmental problems.In this study we develop low cost and low density biodegradable composite materials thatcan be recycled and help to combat the pollution problems of the 21st century. The workdone in this thesis is oriented along this axis and aims to develop mixtures based on polyvinylchloride and fiber Atriplex halimus whose loading rates vary from 1% to 10%. The varioustechniques of characterization were carried out on the developed mixtures. The physicalproperties such as absorption, as well as mechanical, hardness, tensile test, showed animprovement of the content and resistance of our material reinforced by the vegetable fiber.These observations lead us to conclude that such a material can be used on an industrialscale for packaging applications Voir les détails

Mots clés : composite materials, Polyvinyl chloride, Atriplex halimus, Vegetable fiber

Effect of Cu/Ni Ratio on the Chemical composition, Magnetic behaviour, and Structural properties of a FeCuNi based alloy

KH. KINAI, H. AMARI  (2021)
Mémoire de Master

The aim of this project is to study and understand the influence of copper and nickel concentration on the magnetic, morphological and structural properties of the Fe70Cu30-xNixalloy. The alloy was elaborated by mixing iron, nickel and copper powders by the mechanicalalloying technique for 10 hours of milling. The elements were characterised by different techniques: X-ray diffraction (XRD), Scanning Electron Microscope (SEM) and Vibrating Sample Magnetometer (VSM). The X-ray diffraction study shows that the crystallite size decreases with increasing Ni. When it come to the magnetic properties, the coercivityHc and the saturation moment Ms rise from 83 Oe, 121.5 emu/g to 156 Oe, 140 emu/g respectively. Voir les détails

Mots clés : Fe70Cu30-xNix, Scanning Electron Microscope (SEM), X-ray diffraction

Caractérisation des écoulements en micro fluide par vélocimétrie à l’échelle micron appliquée aux microsystèmes

Z. Zahali  (2021)
Mémoire de Master

Microfluidics has been a field of research in full expansion for ten years, whose vitality is nourished by the diversity of its applications Today, new technologies indeed make it possible to manufacture electromechanical systems of micro and nanometric size, up to 'at significant levels of complexity, and equipped with all kinds of functionalities. These new possibilities have been used in aspectacular way for many applications, such as DNA microarrays, or lab-onchip. In all these systems, the problem of controlling flows in devices whose dimensions or internal patterns vary from a few hundred nanometers to a few tens of micrometers arises, this work will be devoted to an analysis and characterization of the flows applied to microsystems. Voir les détails

Mots clés : microfluidics, DNA microarrays, microsystems

Effet du traitement de vieillissement sur l’évolution microstructurale et le comportement électrochimique des aciers inoxydables 2101, 2205 et 2507.

F.Z.ROUIBI  (2021)
Mémoire de Master

this work, the effect of ageing treatment on the microstructural evolution, morphology and potential distribution of LDX2101, SDX2205 and SDSS 2507 stainless steels is investigated. The heat treatment is carried out in two stages: solution treatment for one hour, then water quenching followed by ageing at 750°C for 2101 and 850°C for 2205 and 2507, for 24 hours holding time. Metallographical characterization is conducted using optical microscopy and scanning electron microscopy (SEM) as well as XRD analysis to identify the phases and precipitates formed after treatment. In order to study the effect of ageing on the morphological changes, magnetic behavior and potential distribution on the surfaces of the treated steels, different modes of atomic force microscopy (AFM) are used. The results showed a clear increase in roughness with a very heterogeneous potential distribution due to microstructural changes as a result of the formation of precipitates and secondary phases Voir les détails

Mots clés : LDX2101, SDX2205, SDSS 2507 stainless steels, The heat treatment

Elaboration et caractérisation des nanoparticules a base de chlorure d’étain SnCl2 et l’application d’élimination de colorants par adsorption

A. BOUCHENAK  (2021)
Mémoire de Master

Nanoparticles (NPs) have received considerable attention in recent years due to their unique physicochemical and optoelectronic properties and their applications in various sectors of chemistry, environment, medicine, agriculture and electronics. This dissertation will focus on three main parts, after an introduction to nanotechnologies: a bibliographic study on everything related to nanoparticles, their types, their synthesis methods, their characterizations, their properties and their applications. In the second part we have cited all the experiments of elaboration of our samples of nanoparticles (based on tin chloride) using the method of Co-precipitation so that at the end we have chosen the one that gives the best result to use it in the application of removal of methyl blue dye by adsorption. The third part shows that the results of our samples are excellent and from there we concluded that the nanoparticles (tin ferrites) and thanks to their magnetic behavior they allow to eliminate easily the methyl blue dye by magnetic field. Voir les détails

Mots clés : Nanoparticles (NPs), Magnetic field

Implémentation Des Algorithmes de Traitement du Signal sur carte FPGA

Mémoire de Master

The aim of this work is to realize an on-board system allowing to automate the control in NDT by ultrasonic. For this, we performed the transmission and reception of signals using an FPGA card that acquisition and signal processing are implemented on the same FPGA circuit. Voir les détails

Mots clés : Non-destructive testing (CND), ultrasonic signals, FPGA, Signal processing

Elaboration et Caractérisation des Cuprates Supraconducteurs de type YBCO

Y. Louani  (2021)
Mémoire de Master

In this work, we prepared YBCO samples by sol-gel process and the gel decomposition studied by TG/DSC, which shows the X-ray diffraction due to the fact that the samples contained a preponderant phase (YBa2Cu3O7). SEM images showed the polycrystalline structure of samples with grain size between 2 and 3 µm and high porosity rate. Longitudinal and transverse ultrasonic velocity and attenuation measurements were performed on 3 mm thick samples. The experiments were performed at room temperature (300 K). The objective of this technique is ultrasonic characterization. Voir les détails

Mots clés : YBCO, sol-gel, XRD, DTA, Ultrasound

Etude D’efficacité D’inhibiteur NALCO E1154A Sur L’acier A36 Utilisé Dans Les Bacs De Stockage Des Hydrocarbures Du Site GTFT-ILIZI

Mémoire de Master

The corrosion of the condensate and LPG storage tanks in the GTFT zone presents a major problem that leads to a degradation of the storage tanks where huge sums are spent annually to protect the structures against corrosion, The maintenance and repair of the storage tanks. storage systems go through a detailed inspection program in order toobtain the data necessary to be properly adapted, today corrosion protection includes treatments such as cathodic protection, surface treatments or even the modification of the corrosive environment by addition of corrosion inhibitors. These constitute an original means of combating corrosion.In order to test the effectiveness of NALCO 115 EC 1154A inhibitor on A36 steel for use in the protection against corrosion of storage facilities for hydrocarbon products inthe GTFT zone, we were interested in this study to seek the optimal concentration in order to perform electrochemical tests. Voir les détails

Mots clés : corrosion, storage bins, inhibitors, A36 steel

Préparation et caractérisation des nanoparticules de ferrite de nickel dopée au Cérium par la méthode de coprécipitation

A. TALBI, A. SALHI  (2020)
Mémoire de Master

Nanocrystalline powders of cerium-doped nickel ferrite were synthesised by the coprecipitation method and the effect of the non-magnetic cerium content on the structural and magnetic properties was studied. X-ray diffraction (XRD) was used to determine the structure of NiFe2O4 nanoparticles. The surface morphology and chemical composition of the NiFe2O4 nanoparticles were obtained by scanning electron microscope analysis. The magnetic properties were studied by Vibrating Sample Magnetometry (VSM). Magnetic hysteresis cycles were measured with a maximum applied magnetic field of ≈ 1000Oe Voir les détails

Mots clés : NiFe2O4, cerium, co-precipitation, Magnetic Properties, DRX, SEM, VSM

Mise en œuvre de l’essai de fatigue sur des alliages d’aluminium

S. BENRABAH  (2020)
Mémoire de Master

The problem of fatigue of structures is commonly present in all sectors of the maritime, aeronautical, and mechanical and many other industries. In order to fully understand this harmful phenomenon, tests of different types of stresses are carried out at the laboratory level. This requires a good mastery of the test protocol. The analysis of the results obtained by these tests allows to study the behavior of the material. Our study consists in the implementation and the determination of the operating conditions of a uniaxial fatigue test with two types of specimens made of aluminum alloys of different thicknesses are tested. A tensile test is carried out to determine the mechanical behavior of the specimens and to have the necessary parameters to carry out a fatigue test, a metallographic study to characterize the specimens before carrying out the fatigue test. All the results obtained from the test are in the form of curves and a hysteresis loop. Voir les détails

Mots clés : Fatigue test, fatigue of aluminum, aluminum’s alloys