171,458 research outputs found
New Polypyridyl Ruthenium (II) Complexes with tetrazolate ligands
No full textWe have recently reported some new mono and dinuclear Ru(II) polypyridyl complexes containing various 5-substituted tetrazolate ligands which were shown to act as efficient ElectroChemiLuminescence (ECL) luminophores [1].
In light of these interesting results, we now report a series of new polypyridyl Ru(II) complexes in which thienyl-tetrazole derivatives as well chelating tetrazolates are introduced in the coordination sphere of the metal centres.
A complete survey of the main coordinative, electrochemical and structural features of these complexes will be presented.
1. Stagni, S.; Palazzi, A.; Zacchini, S.; Ballarin, B.; Marcaccio, M.; Paolucci, F.; Bruno, C.; Monari, M.; Carano, M.; Bard, A.J. Inorg. Chem. 2006, 45, 695-709
A RIO-like Technique for Interactivity Loss Avoidance in Fast-Paced Multiplayer Online Games
No full textThe astonishing increase in the spread of the Internet has given rise to a globally connected community proficient at deploying online games for a large number of participants geographically located very far from each other. However, online games are characterized by more stringent requirements than traditional distributed applications deployed over the Internet can fulfill. Indeed, one of the key factors in determining the success of an online game is its ability to rapidly deliver events to the various game servers that maintain the state of the game over the network. We have already demonstrated [Palazzi et al. 2004] that in this context adapting RED (random early detection) techniques, borrowed from queuing management, can improve the global responsiveness of a game. However, this solution may not be sufficient for a specific class of online games. We deem that fast-paced multiplayer online games (such as shoot 'em ups, for example) in which participants have to behave frenetically, must guarantee a very high degree of interactivity, even at the cost of partially sacrificing the consistency of the game state. In this case having only a partially consistent view of the game state will not affect a player's amusement as much as delaying action-processing activity will. Hence we explore the possibility of applying a RIO-based (RED with in and out) algorithm to manage game delivery to the various game servers, in order to improve the degree of interactivity for fast-paced online games. Preliminary experimental results confirm the viability of our approach
Tetrazolates as conjugated bridges for Ir(III)-Ru(II) mixed complexes
No full textThe study of the chemistry of tetrazolate metal complexes is the primary thrust of our research program. [1] The scientific activity was initially focused to the preparation of Fe(II) organometallic species containing 5-aryl tetrazolate ligands and extended to the study of a wide range of analogous Ru(II) polypyridyl complexes. The electrochemical features shown by these compounds, together with their highly efficient ElectroChemiLuminescence (ECL) performances, [2,3] prompted the exploitment of new tetrazolate-based Ir(III) cyclometalated complexes. The study of the excited state properties of these Ir(III) complexes showed that all compounds emit highly intense visible light at room temperature, with emission maxima ranging from 480 to 580 nm. Finally, the search for new light-emitting molecules introduces the latest development of our research, which is represented by the synthesis of new tetrazolate-based dinuclear mixed species showing the presence of both Ru(II) and Ir(III) luminophoric systems.
[1] Palazzi, A.; Stagni, S.; J. Organomet. Chem. 2005, 690, 2052 and refs. therein;
[2] Stagni, S.; Palazzi, A.; Zacchini, S.; Ballarin, B.; Marcaccio, M.; Paolucci F.; Bruno C.; Monari M.; Carano M.; Bard, A.J. Inorg. Chem. 2006, 45, 695;
[3] Zanarini, S.; Bard, A.J.; Marcaccio, M.; Palazzi, A;. Paolucci, F.; Stagni, S. J. Phys. Chem. B, 2006, 110, 22551
Palazzi di Parma. Dalle stanze del potere alle dimore nobili
No full textIl volume raccoglie, integrandoli con una presenta-zione critica, un apparato di mappe storiche e una bibliografia finale, una serie di circa quaranta articoli pubblicati dal febbraio al dicembre 2020 sul quotidiano “Gazzetta di Parma” in una pagina settimanale dedicata ai palazzi della città. Collocata nell’ambito dell’alta divulgazione scientifica, la trattazione si articola in tre sezioni riccamente illustrate di dodici palazzi ciascuna, per ognuno dei quali è presentata la vicenda storica e architettonica, una cronologia e un breve testo di approfondimento
Poster: High bandwidth and low delay over wireless multihop networks
No full textWe consider a scenario where connectivity is offered to users through a multihop wireless network and show how both the file download's goodput and the real time stream's per-packet delivery delay can be improved by making involved nodes take into consideration the multihop nature of their connection
Cambiamenti strutturale e sviluppo economico. Confronto fra paesi attraverso l'analisi fattoriale a più vie
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Further Insights In The Study of Polypyridyl Ruthenium (II) Complexes With Tetrazolate Ligands
No full textOver the past two decades, polypyridyl complexes of d6 metal ions, owing to their peculiar electrochemical and photophysical properties, have received great attention. In particular, even though a wide range of nitrogen rich aromatic ligands have been employed in the design of mono and dinuclear ruthenium complexes, tetrazole compounds have been only rarely considered in such kind of chemistry. Thus, as the extension of our previous studies,[1] we have recently reported [2] some new mono and dinuclear Ru(II) polypyridyl complexes containing various 5-substituted tetrazolate ligands which were shown to act as efficient ElectroChemiLuminescence - ECL – luminophores. In light of these interesting results, we now report a series of new Ru(II) and Ir(III) complexes in which thienyl-tetrazole ligands as well as chelating tetrazolates are introduced in the metal coordination sphere.
[1] Palazzi, A.; Stagni, S.; Bordoni, S.; Monari, M.; Selva, S. Organometallics 2002, 21, 3774;. Palazzi, A.; Stagni, S.; Monari, M.; Selva, S. J. Organomet. Chem. 2003, 669, 135.
[2] Stagni S., Palazzi A., Zacchini S., Ballarin B., Marcaccio M., Paolucci F., Bruno C., Monari M., Carano M., Bard A.J. Inorganic Chemistry 45, 695-709, 200
IEEE International Workshop on Ubiquitous Multimedia Systems and Applications
No full textSi tratta del IEEE International Workshop on Ubiquitous Multimedia Systems and Applications tenuto a St Petersburgh, Russia, Ottobre 200
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