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B.P. 32 El-Alia, 16111 Bab-Ezzouar, Alger, Algeria a am_louni@yahoo.fr Keywords: virgin engine oil, used oil, degradation, oil acidity Abstract.
Fig.2: Evolution of metal contents with different drain: a) Fe; b) Cr; c) Cu ;d) Al ; e) Sn.
Increasing the aluminum (Al) content may be the consequence of a piston seizure.

Xu et al. [5] indicated that the hardness and wear resistance of MoS2-Cu-Gr composite increased with the increase of MoS2 content.
Tjong et al. [7] indicated that addition of 5 vol.% TiB2 particles to copper led to dramatic improvement of wear resistance.
El-Badry, A.M.

Hardin, “Refinable Multivariate Spline Functions, Topics in Multivariate Approximation and Interpolation”, K.Jetter et al.
Hinton et al.
El-Danaf , F.E.I.

El-Sebaii A..& Al-Ghamdi A.& Al-Hazmi F.S. & Faidah Adel S. 2009 Applied Energy Thermal performance of a single basin solar still with PCM as a storage medium.

Valluri, et al.
Lee et al., in: Proc. of the Sixth International Fatigue Congress, edited by G.
El-Sharaway:, Proc. of the Seventh International Fatigue Congress, edited by X.

Vol. 28 (2008), p.329 [2] G.M.Zhang,Y.F.Zheng,Y.C.Wang,et al.
El-Maghrabya: Mater.
Vol.(30)2010, p. 2727 [8] Y.C.Dong, S.Hampshire, J.E.Zhou, et al.

An experimental investigation was performed by Jung et al. [4] using mixture of R290/R600a in ratio of 60/40 by mass fraction in domestic refrigerators reported that COP and energy efficiency improved by 2.3 and 4%, respectively.
Likewise, Mohanraj et al. [5] carried out experimental investigation in a domestic refrigerator originally using R134a replaced by R290/R600a mixture in ratio of 45.2/54.8 by weight, reported an increment in the COP 3.25-3.6%.
El Kafafi, Assessment of propane/commercial/butane mixtures as possible alternatives to R134a in domestic refrigerators, Energy Convers.

The overwhelming majority of metal foams in the market are therefore closed-cell Al foams manufactured by liquid or semi-liquid foaming technologies [4-6].
Liquid route is suitable for low melt metal like Al, Mg, and solid route for high melt metal like Cu, Fe, Ti or Ni.
El-Hadek, S.

Qu et al.[5] had synthesized silica-gels modified by 0-4 generations(G) amino-terminated dendrimer- like PAMAM, and studied thier adsorption properties for metal ions such as Au3+, Pd2+, Pt4+, Ag+, Cu2+, Zn2+ and Hg2+.
Cheng et al.[10] had investigated the complexation between PAMAM and Cr3+.In this work, we synthesized dendrimer-like polyamidoamines based on the silica gel surface (PAMAM-SG).
Vol. 125(2003), p.14832 [3] Y.Li,M.A.El-Sayed: J.Phys.Chem.

Yoshiaki et al [4] studied the hydrolysis of PET in nitric acid under difference experiments, and proposed the mechanism of this reaction was analyzed using the modified shrinking core model, because the TPA produced by the reaction is deposited on the surface of unreacted PET particles.
Fonseca et al [5] demonstrated the alkaline hydrolysis of PET could also be described by shrinking core model with tributylhexadecylphosphonium bromide as phase transfer catalyst.
Element analysis was performed on Elementer Vario El III apparatus.