Managing cultural and natural heritage : strategic perspectives for Latin America and the Caribbean

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How did Kant’s death mask end up in Tartu? Surprising finding at the archive of Art Museum of Tartu University

This article tells how Kant's deathmask ended up in the Museum of Classical Antiquities of the University of Tartu

A postcard sent by Edmund Husserl to Gustav Shpet

This article presents for the first time the postcard sent by Edmund Husserl to Gustav G. Shpet

A page of poetical Kant heritage

Poems devoted to Kant give different poeticalphilosophical interpretations of both the personality of philosopher and his teaching on God and human being. In his poems about Kant, poet Alexander Kushner demonstrates theological agnosticism, which correlates with Kant’s own theories. In the poem Kant's Mask and the aphorisms Kant Unmasked, Vl. Mikushevich addresses Kant’s attitude to God from the religiousphilosophical point of view. Such dialogue at a high level of poetic and philosophical culture enriches these cultures

Peculiarities of the triplet relaxed excited-state structure and luminescence of a CsI:Tl crystal

Four emission bands, all belonging to the main thallium centres, have been detected in CsI:Tl, and their spectral, polarization and kinetic characteristics have been studied at 0.35-320 K. A new model is proposed for the excited states responsible for the luminescence of thallium-doped caesium iodide. In this model, the main thallium centre is considered as a cluster consisting of a Tl+ ion and at least 12 I- and 11 Cs+ ions. Two weak ultraviolet emission bands of CsI:TI (3,31 and 3.09 eV) are ascribed to electronic transitions from trigonal and tetragonal Jahn-Teller minima of the tripler relaxed excited state, whose structure is similar to that of Tl+ centres in Fee alkali halides. Two intense visible bands (2.55 and 2.25 eV) are assumed to arise from two different ('weak' and 'strong') off-centre configurations of a self-trapped exciton perturbed by the Tl+ ion. The minima responsible for all the emission bands are located on the same adiabatic potential energy surface. The excitonic-like nature of visible emission could explain the high scintillation efficiency of CsI:Tl

Luminescence and decay kinetics of relaxed bound excitons and impurity states in CsX:Tl+ (X=Cl, Br, I).

Luminescence, decay kinetics and polarization properties of single Tl+-based centres in CsX hosts (X = Cl, Dr, I) are described in a wide temperature interval 0.3 - 400 K. It is shown that four emission bands co-existing at the same relaxed excited state surface belong to this centre. At sufficiently high temperatures all the relaxed excited state minima are mutually connected by the thermally stimulated transitions

Cryogenic particle detectors with superconducting phase transition thermometers

A tungsten superconducting phase transition thermometer on a 32 g sapphire crystal has given an energy resolution of 100 eV (FWHM) for 1.5 keV X-rays, increasing to 440 eV at 14 keV. A possibility to obtain similar resolution in much larger crystals by using Al films as phonon collectors is presented