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Altitude effect on the properties of honeys from the region of Jijel (Algeria)

100%

Bouhala A. , Ouchemoukh S. , Moussi A. , Beidjoudi S.

2020

tom 70

nr 2

Coastal and mountainous honey samples were collected from different regions in Jijel (Algeria) to evaluate their moisture content, electrical conductivity, ash content, pH, acidity, protein content, color parameters, antioxidants content, radical scavenging activity, reducing power, and antibacterial activity, to reveal the differences between coastal and mountain honeys and to determine the correlation between altitude and different parameters. The results indicate that Jijelian honeys were dark with acceptable physicochemical properties and a good bioactive potential. Escherichia coli was sensitive to Jijelian honeys while Staphylococcus aureus and Pseudomonas aeruginosa were more resistant. Coastal honeys had statistically significantly higher pH, electrical conductivity, ash content, color intensity, hydroxymethylfurfural (HMF) content, and reducing power than the mountainous samples (p<0.05), while the total acidity was higher in the mountain honeys (p<0.05). The altitude was significantly negatively correlated with HMF content, electrical conductivity, ash content, and pH. The correlation coefficients were -0.510, -0.405, -0.360, and -0.355, respectively.

Compositional analysis of silicon oxide/silicon nitride thin films

100%

Meziani S. , Moussi A. , Mahiou L. , Outemzabet R.

Materials Science Poland

2016

tom Vol. 34, No. 2

315--321

Hydrogen, amorphous silicon nitride (SiNx:H abbreviated SiNx) films were grown on multicrystalline silicon (mc-Si) substrate by plasma enhanced chemical vapour deposition (PECVD) in parallel configuration using NH3/SiH4 gas mixtures. The mc-Si wafers were taken from the same column of Si cast ingot. After the deposition process, the layers were oxidized (thermal oxidation) in dry oxygen ambient environment at 950 ºC to get oxide/nitride (ON) structure. Secondary ion mass spectroscopy (SIMS), Rutherford backscattering spectroscopy (RBS), Auger electron spectroscopy (AES) and energy dispersive X-ray analysis (EDX) were employed for analyzing quantitatively the chemical composition and stoichiometry in the oxide-nitride stacked films. The effect of annealing temperature on the chemical composition of ON structure has been investigated. Some species, O, N, Si were redistributed in this structure during the thermal oxidation of SiNx. Indeed, oxygen diffused to the nitride layer into Si2O2N during dry oxidation.