Amina Hasnaoui

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Tensile experiments of fully dense nanocrystalline structures with a mean grain size of less than 100 nanometers demonstrate a considerable increase in hardness but a remarkable drop in elongation-to-failure, indicating brittle behavior. However, dimple structures are often observed at the fracture surface, indicating some type of ductile fracture(More)
In this work, we propose a new framework able to ensure the Quality-of-Services (QoS) with different security levels in Wireless Sensor Networks (WSNs). We propose a new model based on the PID (Proportional Integral Derivative) controller in order to dynamically select the security level adapted to QoS requirement while considering the energy consumption.(More)
The oxidation of aluminum single crystals is studied using molecular dynamics (MD) simulations with dynamic charge transfer between atoms. The simulations are performed on three aluminum low-index surfaces ((100), (110) and (111)) at room temperature. The results show that the oxide film growth kinetics is independent of the crystallographic orientation(More)
Room temperature UV-vis absorption spectra of the tautomeric system 3,5-dithio-2,7-dimethyl-[1,2,4]-triazepine in solution, in acetonitrile (CH3CN), are measured at different water volume percentages. The comparison of the obtained measures to the calculated allowed absorption transitions, using ZINDO/S package, reveals the coexistence of all the tautomeric(More)
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