Musique folklorique hongroise / Gyorgy Sebok, piano

Titre uniforme : [Tizenöt magyar parasztdal. BB 79]Collection : Fiori musicaliComprend : Danses hongroises du XVIIe siècle : transcription libres pour piano / Ferenc Farkas - Chants paysans hongrois op. 22 : 3 °suite / Leo Weiner - Quinze chants hongrois : Quatre chants anciens, Scherzo, Ballade (thème et variations), Neuf danses anciennes / Bela BartokBnF-Partenariats, Collection sonore - BelieveContient une table des matière

SUITE DE DANSES ; TROIS BURLESQUES OP. 8c / Béla BARTOK. DANSES DE MAROSSZEK. SEPT PIECES POUR PIANO OP. 11 / Zoltan KODALY ; György SEBOK, piano

Titre uniforme : [Három burleszk. BB 55]BnF-Partenariats, Collection sonore - BelieveContient une table des matière

Acknowledgement

In a recent paper we introduced the fixed-queue-ratio (FQR) family of routing rules for many-server service systems with multiple customer classes and server pools. A newly available server next serves the customer from the head of the queue of the class (from among those he is eligible to serve) whose queue length most exceeds a specified proportion of the total queue length. Under fairly general conditions, FQR produces an important state-space collapse as the total arrival rate and the numbers of servers increase in a coordinated way. That state-space collapse was previously used to delicately balance service levels for the different customer classes. In this sequel, we show that a special version of FQR stochastically minimizes convex holding costs in a finite-horizon setting when the service rates are restricted to be pool-dependent. Under additional regularity conditions, the special version of FQR reduces to a simple policy: Linear costs produce a priority-type rule, in which the least-cost customers are given low priority. Strictly convex costs (plus other regularity conditions) produce a many-server analogue of the generalized-cµ (Gcµ) rule, under which a newly available server selects a customer from the class experiencing the greatest marginal cost at that time

H₂/D₂ exchange reaction on mono-disperse Pt clusters: enhanced activity from minute O₂ concentrations

The H-2/D-2 exchange reaction was studied on mono-disperse Pt-8 clusters in a mu-reactor. The chemical activity was studied at temperatures varying from room temperature to 180 degrees C using mass spectrometry. It was found that minute amounts of O-2 in the gas stream increased the chemical activity significantly. XPS and ISS before and after reaction suggest little or no sintering during reaction. A reaction pathway is suggested based on DFT. H-2 desorption is identified as the rate- limiting step and O-2 is confirmed as the source of the increased activity. The binding energy of platinum atoms in a SiO2 supported Pt-8 cluster is found to be comparable to the interatomic binding energies of bulk platinum, underlining the stability of the model system