Les violences juvéniles en milieu scolaire: Etat des lieux

Les actes de violence en milieu scolaire se cumulent et détériorent le climat des classes et des établissements. Insultes, vol de fourniture, surnoms désagréables, bousculades, mises à l’écart et bien d’autres faits dramatiques parfois fatals. Les actes commis sont tantôt dirigés contre l’institution ou le personnel, tantôt entre les élèves eux-mêmes.La violence scolaire constitue une préoccupation majeure du monde de l’éducation et suscite l’intérêt de nombreux chercheurs et praticiens de différents domaines. C’est une problématique interpelle non seulement l’école, la famille et la communauté, mais également et surtout, la société en qui se reflète notre devenir collectif. Mesurer le poids de cette calamité appelle à comprendre les causes pour en trouver les solutions efficaces

Antioxidant activity of phenols and flavonoids contents of aqueous extract of Salvia Officinalis origin in the North-East Morocco

Oxidative stress is responsible for several diseases. This phenomen has moved researchers into action in looking for new remedies «antioxidants». The aim of this work was to characterize the phenols and flavonoids compounds of extracts of Salvia Officinalis from  North-East Morocco (TAZA) in terms of antioxidant activity.  The antioxidant activityof this aromatic plant was determined according to the DPPH radical scavenging assay to suggest it as a new potential source of natural antioxidants. The quantification of phenolics and flavonoids compounds of solvent extracts (diethyl ether and ethyl acetate) were determined spectrometrically. Furthermore, The DPPH scavenging activity of extracts increased in the order diethyl ether extract < ethyl acetate extract < ascorbic acid. Finally, we suggest that the phenols and flavonoids compounds of Salvia Officinalis has significant potential as a natural antioxidant

The Inhibitive Effect of 2-Phenyl-3-nitroso-imidazo [1, 2-a]pyridine on the Corrosion of Steel in 0.5 M HCl Acid Solution

Abstract: The effect of 2-phenyl-3-nitroso-imidazo[1,2-a]pyridine (PNIP) on the corrosion inhibition of carbon-steel in 0.5 M HCl was studied by weight loss and different electrochemical techniques such as electrochemical impedance spectroscopy (EIS), potentiodynamic polarization. The obtained results showed that PNIP effectively reduces the corrosion rate of carbon steel. Inhibition efficiency (E%) increases with inhibitor concentration to attain 88% at 10 -3 M. Adsorption of that PNIP on the carbon steel surface in 0.5 M HCl follows the Langmuir isotherm model. E% values obtained from various methods used are in good agreement. SEM characterization of the steel surface is made