Nous construisons une famille de diffusions Feller à deux paramètres sur l’ensemble des sous-ensembles ouverts (0, 1). Ces apparaissent comme les limites diffusives chaînes ascendantes et descendantes du processus restaurant chinois paramètres. Les que nous sont analogues ordonnés naturels l’extension paramètres, introduite par Petrov, modèle diffusion avec un nombre infini d’allèles neutres co...

in this study, the stability problem of a circular orthotropic cylindrical shell under the effect of anaxial compression varying with a power function of time is considered. at first, the modified donnell typedynamic stability and compatibility equations are obtained using love’s shell theory. applying the galerkinmethod and rayleigh-ritz variational techniques to these equations and taking the...

Disformal transformation provides a map relating different scalar-tensor and vector-tensor theories gives access to powerful solution-generating method in modified gravity. In view of the vast family new solutions one can achieve, it is crucial design suitable tools guide their construction. this work, we address question by revisiting Petrov classification disformally constructed gravity theor...

The author investigates into the history of main military library Russian Empire. In mid 19-th century, General Staff Library became one largest book depositories in Russia. sets goal to review events related during period when F. Kruse and A. N. Petrov were heading institution. This was characterized by consistent collection development collaborations with historians, new trends expanding open...