Adaptive high-order finite element solution of transient elastohydrodynamic lubrication problems

This article presents a new numerical method to solve transient line contact elastohydrodynamic lubrication (EHL) problems. A high-order discontinuous Galerkin (DG) finite element method is used for the spatial discretization, and the standard Crank-Nicolson method is employed to approximate the time derivative. An h-adaptivity method is used for grid adaptation with the time-stepping, and the penalty method is employed to handle the cavitation condition. The roughness model employed here is a simple indentation, which is located on the upper surface. Numerical results are presented comparing the DG method to standard finite difference (FD) techniques. It is shown that micro-EHL features are captured with far fewer degrees of freedom than when using low-order FD methods

Formation of Values and Value Orientations of Schoolchildren in Extracurricular Activities

Статья посвящена актуальной проблеме формирования ценностей и ценностных ориентаций школьников в контексте внеурочной деятельности. Внеурочная деятельность, являясь достаточно широким понятием, имеет значительный потенциал в развитии ценностных ориентаций обучающихся, являясь мощным ресурсом трансформации ценностных ориентаций.The article is devoted to the actual problem of the formation of values and value orientations of schoolchildren in the context of extracurricular activities. Extracurricular activities, being a fairly broad concept, has a significant potential in the development of students' value orientations, being a powerful resource for the transformation of value orientations

СИНТЕЗ 2-АЦИЛЦИКЛОПЕНТАН-1,3-ДИОНОВ С НАСЫЩЕННОЙ С9–С22 АЦИЛЬНОЙ ЦЕПЬЮ

The synthesis of new 2-acylcyclopentane-1,3-diones with a saturated С9–С12 acyl chain was described. The compounds were synthesized by the O-acylation of cyclopentane-1,3-dione with appropriate acyl chlorides in the presence of pyridine in chloroform, followed by the O–C- isomerization of the prepared enol acylates under the action of acetone cyanohydrin in acetonitrile in the presence of triethylamine.Описан синтез новых 2-ацилциклопентан-1,3-дионов с насыщенной С9–С12 ацильной цепью О- ацилированием циклопентан-1,3-диона хлорангидридами соответствующих карбоновых кислот в присутствии пиридина в хлороформе c последующей О–С-изомеризацией образующихся енолацилатов под действием ацетонциангидрина в среде ацетонитрила в присутствии триэтиламина

Nonlinear optics of molecular nanostructures in solution: Assessment of the size and nonlinear optical properties

Most of the known self-assembly processes occur in solution, where nanosized objects interact each other forming new structures. Their real-time characterization in terms of the size and optical properties of these objects is vital for understanding those interactions. We report a novel application of nonlinear optics to study molecular structures and assemblies. By measuring the power of the third harmonic generated in a solution of nanoparticles, we determined both the size and the third-order nonlinear optical susceptibility of those nanoparticles. The newly developed technique was successfully employed to observe the structural organization of collagen (type I) molecules in solution

Dispositions en matière de droit financier de la loi n° 99-532 du 25 juin 1999 relative à l'épargne et à la sécurité financière

International audience(JO 29 juin 1999, p. 9487 ; D. affaires 1999. 1057 et 1121