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8 results on '"Khelifa, Hocine"'

3. Experimental investigation of the physico-chemical and mechanical properties of olive pits

Author

Bouhemame, Nasser, Abderrezak Bezazi, Khelifa, Hocine, Pino, Gilberto Garcia Del, P.N.B. Reis, and Scarpa, Fabrizio

Subjects
Compression properties, Olive pits, Physico-chemical analysis, Agricultural waste
Abstract

After the olive harvest, part is devoted to the production of olive oil and the other to table olives (pitted and notpitted). This study focuses on the potential for recovery and recycling of certain agricultural waste, such as olive pits, i.e. the solid phaseresulting from the pitting of olives. First, the olive pits are recovered, washed, dried, then ground into powder form, and then aphysicochemical characterization was carried out to determine their physico-chemical and thermal properties using the humidity analyzer,the Fourier Transform Infrared Spectroscopy (FTIR), Thermogravimetric Analysis (TGA) and Differential Scanning Calorimetry (DSC).In addition, a study of the mechanical properties in compression of olive pits was also carried out. Due to the dispersions of the experimental results obtained, a statistical study based on the two-parameter Weibull method was used with the aim of correctly evaluating the mechanical characteristics of the olive stones studied. On the other hand, the comparison showed that the experimentalvalues are very close to the average values obtained with the proposed statistical distribution.

Published
2022
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4. Numerical investigation of damage protective oxide mechanisms in thermal barrier system for aeronautical turbine blade.

Author

khelifa hocine, YOUSFI Ahmed, GRIBIZ Djaloul, and BOUMAZA A. Charif

Subjects
Structural engineering (General), TA630-695
Abstract

The choice of a material for a given application requires insuring a good durability in its conditions of employment, in particular environmental. It is especially true for the systems destined to work in corrosive hot atmospheres. For it, the knowledge and the understanding of the corrosion phenomena, oxidization, ageing and damage are indispensable in order to anticipate the life period of the structures and to propose the adapted protective solutions. The study of the corrosion in high temperature is therefore a greatly interdisciplinary topic, into the interface of the physico-chemistry, metallic and ceramic materials and mechanics. We propose in this work a finite element method for the simulation of EBPVD TBCs spallation. Our studies concern one of several systems that we call thermal barrier coatings, which are a Composite materials deposited in layers on the hot components to isolate them chemically and thermally at high temperatures. This is the last operational technology adapted on aircraft engines but it is still studied and not fully exploited.This comprehensive article describes the systems currently used and the problem of interaction between mechanical and environment in the turbine.

Published
2015

6. Effect of Conducting and Semiconducting Nanoparticles on the AC Breakdown Voltage and Electrostatic Charging Tendency of Synthetic Ester

Author

Khelifa, Hocine, Beroual, Abderrahmane, and Vagnon, Eric

Abstract

This work aims to study the effect of conducting and semiconducting nanoparticles (NPs) on ac breakdown voltage (ac-BDV) and the electrostatic charging tendency (ECT) of synthetic ester (SE), namely, MIDEL 7131; ac-BDV and ECT are two important properties that must be considered when choosing an insulating oil for use in power transformers. The NPs being tested are iron oxide (Fe3O4, fullerene (C60, and copper oxide (CuO) NPs at 0.1-g/L (0.01 wt%) concentration. An improved nanofluid (NF) preparation procedure and the ECT test cell are presented. This latter consists of a spinning disk covered on both sides by the solid insulator being tested and immersed in the investigated liquid. It is observed that NF with Fe3O4NPs shows the best improvement of ac-BDV; this improvement is about 22.44%. The improvements are about 7.81% and 8.24% with 0.1-g/L CuO and C60NFs, respectively. Regarding ECT, the measurement results show that the liquid volume charge density increases with disk rotation speed over time; a lower ECT is observed with the three NFs. Also, the NFs show a similar ECT at low speed (200 r/min); beyond that speed, the effect of adding CuO and C60NPs on the ECT reduction of MIDEL 7131 becomes more significant than that with Fe3O4NPs.

Published
2023
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