Argonautes, l'Océan et la Mer Noire

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A Roman Military Diploma Issued to a Sailor of the Classis Flavia Moesica

Publikation eines Militärdiploms, dessen drei Fragmente 2004/2005 bei Ausgrabungen in Olbia am Schwarzen Meer entdeckt wurden. Das Diplom gibt eine vom 8. Februar 157 stammende kaiserliche Konstitution für die Hilfstruppen und die Flotte von Moesia Inferior wieder. Es wurde für einen gregalis der Classis Flavia Moesica ausgestellt, dessen Name nicht überliefert ist. Der Präfekt der in dem Diplom genannten Flotte führte das cognomen Potamo.Publication of a military diploma of which three fragments were discovered during excavations at Pontic Olbia in 2004 and 2005. The diploma reproduces the constitution of Feburary 8th 157 AD addressed to the auxiliary troops and fleet of Moesia Inferior. It was delivered to a gregalis of the Classis Flavia Moesica whose name is not preserved. The praefectus classis mentioned in the diploma bears the cognomen Potamo.Publication d’un diplôme militaire dont trois fragments ont été découverts lors des fouilles à Olbia Pontique en 2004 et 2005. Le diplôme reproduit la constitution du 8 février 157 pour les troupes auxiliaires et la flotte de Mésie Inférieure. Il a été délivré à un gregalis de la Classis Flavia Moesica dont le nom n’est pas conservé. Le préfet de la flotte mentionné dans le diplôme portait le cognomen Potamo

Super-heavy fermion material as metallic refrigerant for adiabatic demagnetization cooling

Low-temperature refrigeration is of crucial importance in fundamental research of condensed matter physics, as the investigations of fascinating quantum phenomena, such as superconductivity, superfluidity and quantum criticality, often require refrigeration down to very low temperatures. Currently, cryogenic refrigerators with $^3$He gas are widely used for cooling below 1 Kelvin. However, usage of the gas is being increasingly difficult due to the current world-wide shortage. Therefore, it is important to consider alternative methods of refrigeration. Here, we show that a new type of refrigerant, super-heavy electron metal, YbCo$_2$Zn$_{20}$, can be used for adiabatic demagnetization refrigeration, which does not require 3He gas. A number of advantages includes much better metallic thermal conductivity compared to the conventional insulating refrigerants. We also demonstrate that the cooling performance is optimized in Yb$_{1-x}$Sc$_x$Co$_2$Zn$_{20}$ by partial Sc substitution with $x\sim$0.19. The substitution induces chemical pressure which drives the materials close to a zero-field quantum critical point. This leads to an additional enhancement of the magnetocaloric effect in low fields and low temperatures enabling final temperatures well below 100 mK. Such performance has up to now been restricted to insulators. Since nearly a century the same principle of using local magnetic moments has been applied for adiabatic demagnetization cooling. This study opens new possibilities of using itinerant magnetic moments for the cryogen-free refrigeration

Leskov A.M. Notes d'un archéologue.

International audienc

A propos de l'analyse du récit d'Hérodote de l'expulsion des Cimmériens de la région pontique

Résumé publié des communications dans: Les problèmes des études des Iraniens et des Alans. La conférence consacrée à quatre-vingt-dixième anniversaire du Prof. V.I.Abae

A New Dedication from Olbia and the Problem of the City’s Reconstruction after the Raid of Burebista

Résumé publié des communications dans : Mobility in Research of the Black Sea Region. International Symposium. Ias

Troitskiï variant

Intervention dans un média : Modèle de l’institut de l’Académi

Lettre ouverte au ministre de la formation et de la recherche Dmitriï Livanvov

Article de vulgarisation dans Polit.r