ParisTech

About: ParisTech is a education organization based out in Paris, France. It is known for research contribution in the topics: Finite element method & Residual stress. The organization has 1888 authors who have published 1965 publications receiving 55532 citations. The organization is also known as: Paris Institute of Technology & ParisTech Développement.

Essential oil composition of Rosa damascena Mill. from different localities in Lebanon

Abstract: Rosa damascena Mill. is used for essential oil production in many regions in the world. Surveys conducted in Lebanon showed that Lebanese people still widely use R. damascena in its multiple varieties to produce rose water. In this study seven cultivars of R. damascena growing in different ecosystems were collected from several regions in Lebanon. The oil has been extracted by steam distillation and analyzed by gas chromatography coupled to mass spectrometry GC/MS and gas chromatography equipped with a flame ionizing detector GC/FID. The investigated factors were cultural practices, taxonomical and ecological characters. We report the differences in the identified components. The study shows quantitative and qualitative differences between all samples and those of oils from other countries. This is the first report on the chemical composition of R. damascena growing in Lebanon.

Investigation of tool geometry effect and penetration strategies on cutting forces during thread milling

Abstract: The application of thread milling is increasing in industry because of its inherent advantages over other thread cutting techniques. The objective of this study is to investigate the effect of milling cutter tool geometry on cutting forces during thread milling. The proposed method can compare the performance of milling cutters in spite of the different number of tooth. The best thread milling cutter among the studied tools was determined from the cutting forces point of view. Furthermore, this study also pinpoints the best penetration strategy that provides minimum cutting forces. Lower cutting force variations will lead to fewer vibrations of the tool which in turn will produce accurate part.

Unraveling the Self-Assembly of the (S)-Glutamic Acid “Flower” Structure on Ag(100)

Abstract: (S)-Glutamic acid adsorbed on Ag(100) organizes in different self-assembled structures depending on surface temperature [Smerieri, M.; Vattuone, L.; Kravchuk, T.; Costa, D.; Savio, L. (S)-Glutamic Acid on Ag(100): Self-Assembly in the Nonzwitterionic Form. Langmuir2011, 27, 2393–2404]. In particular, two of these structures, referred to as “square” and “flower” geometries, are found to coexist on the surface upon deposition at T = 350 K. The former assembly was fully resolved at the atomic level in the work of Smerieri et al. [Smerieri, M.; Vattuone, L.; Costa, D.; Tielens, F.; Savio, L. Self-Assembly of (S)-Glutamic Acid on Ag(100): A Combined LT-STM and Ab Initio Investigation. Langmuir2010, 26, 7208–7215], in which we proved that the driving force for adsorption is the van der Waals interactions between the molecules and the Ag surface, that is, that molecules are in a physisorbed state. In this paper, we complete our work by presenting the characterization of the “flower” structure. In contrast to the...