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The production of the mosaic core of Diocletian’s Palace in Split is attributed to the Salonitan mosaic school-workshop, which has been present in the Roman Province of Dalmatia since the end of the second to the beginning of the seventh... more
The production of the mosaic core of Diocletian’s Palace in Split is attributed to the Salonitan mosaic school-workshop, which has been present in the Roman Province of Dalmatia since the end of the second to the beginning of the seventh century. The former comparative analysis of individual samples of mosaic components and certain decorative motifs, which was
executed according to the catalogical model (a globally accepted scientific method), has proven that thesis.
Progress in that research with the goal of continued examination of influence models of the same mosaic workshop, requires a research of utilized materials, in which limestone, marble and dolomite dominate quantitatively.
I his article displays the results of laboratory processing and comparison of several mosaics’structural matter in Diocletian’s Palace, which as a broader agenda has the formation of catalogues of used materials and mapping of their distribution inside the Salonitan school-workshop’s area of influence. Such an overview would enable us to determine more precisely the affiliation of a specific mosaic to a school-workshop. Although the remains of the mosaic from the most representative parts of the Palace (such as the imperial bath houses or the Vestibule) are fragmented, that is, in some cases reduced to the smallest workable pieces, it would be interesting to examine II a found material belongs to a preferred influential habitus of a Salonitan workshop, which would increment its high reputation that stands above provincial influence.
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Endohedral actinide fullerenes are rare and a little is known about their molecular properties. Here we characterize U2@C80 system, which was recently detected experimentally by means of mass spectrometry (Akiyama et al., JACS 2001,... more
Endohedral actinide fullerenes are rare and a little is known about their molecular properties.
Here we characterize U2@C80 system, which was recently detected experimentally by means
of mass spectrometry (Akiyama et al., JACS 2001, 123, 181). Theoretical calculations predict
a stable endohedral system, 7U2@C80 derived from the C80:7 IPR fullerene cage, with six
unpaired electrons. Bonding analysis reveals a double ferromagnetic (one-electron-twocenter)
U‒U bond at rU‒U distance of 3.9 Å. This bonding is realized mainly via U(5f) orbitals.
The U-U interaction inside the cage is estimated to be about -18 kcal/mol. The U‒U bonding
is further studied along the U2@Cn (n = 60, 70, 80, 84, 90) series and the U‒U bonds are also
identified in U2@C70 and U2@C84 systems at rU‒U ~4 Å. It is found that the character of U‒U
bonding depends on the U‒U distance, which is dictated by the cage type. A concept of
unwilling metal-metal bonding is suggested: Uranium atoms are strongly bound to the cage
and carry a positive charge. Pushing the U(5f) electron density into U-U bonding region
reduces electrostatic repulsion between enclosed atoms, thus forcing U‒U bonds.
As sunlight is an excellent source of clean energy, research for harnessing the energy via an efficient photocatalyst that is active under visible light is actively underway. Titania is well accepted as a photosemiconductor and... more
As sunlight is an excellent source of clean energy, research for harnessing the energy via an efficient photocatalyst that is
active under visible light is actively underway. Titania is well accepted as a photosemiconductor and photocatalyst under
ultraviolet light. Effort to make it visible light active has been growing. This review article presents some factors involving
the photocatalytic activity of titania which is active under visible light in terms of crystallography. Based on recent progress, several suggestions are made for a better visible light active titania.
Keywords: Titania; Photocatalyst; Visible Light; Crystal Lattice; Hetero Junction; Excitons; Charge Separation.
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