Resonances and Exclusive Channels: an Experimenter's Summary

A very remarkable number of new results in the study of resonances and exclusive channels has been presented at this conference giving fundamental information in the understanding of strong interactions at low energies. The first results from the new high luminosity colliders are impressive and a lot of activity in this field is foreseen for the future. The most relevant issues are summarized and discussed in this paper.Comment: Talk given at PHOTON 2001, Ascona, Switzerland, September 200

Exclusive Channels in Photon-Photon Collisions at LEP

The study of exclusive channels in photon-photon collisions at e+e- colliders allows to investigate the structure and the properties of hadrons in a very clean experimental environment. A concise review of the most recent results obtained at LEP is presented.Comment: Talk given at XXVIIth Rencontres de Moriond Les Arcs, France, March, 200

Resonance Formation in Two-Photon Collisions

Two-photon collisions at the e$^+$e$^-$ colliders allow to investigate the formation and the properties of resonant states in a very clean experimental environment. A remarkable number of new results have been recently obtained giving important contributions to meson spectroscopy and glueball searches. The most recent results from the LEP collider at CERN and CESR at Cornell are reviewed here.Comment: 10 pages, invited talk presented at Meson2000, Cracow, Poland, May 200

Two-Photon Physics at LEP

A remarkable number of studies have been performed at LEP in the field of two-photon physics in the last four years. These results represent a very important contribution to the understanding of strong interactions at low energies. In particular, significant deviations from QCD predictions are found in the cross sections of inclusive single particle, jet and beauty production. A concise review of some of these results is presented.Comment: Presented at IFAE 2003, Lecce, Italy, 23-26 April, 200

Applications of Biological Cell Models in Robotics

In this paper I present some of the most representative biological models applied to robotics. In particular, this work represents a survey of some models inspired, or making use of concepts, by gene regulatory networks (GRNs): these networks describe the complex interactions that affect gene expression and, consequently, cell behaviour

The K0sK0s Final State in Two-Photon Collisions and Some Implications for Glueball Searches

The K0sK0s final state in two-photon collisions is studied with the L3 detector at LEP using data at centre of mass energies from 91 GeV to 183 GeV. The K0sK0s mass spectrum is dominated by the formation of the f_2'(1525) tensor meson whose two-photon partial width is measured. Clear evidence for destructive f_2-a_2 interference is observed. No signal is present in the region around 2.2 GeV. An upper limit for the two-photon partial width times the K0sK0s branching ratio of the \xi(2230) glueball candidate is then derived. An enhancement is observed around 1750 MeV. It may be due to the formation of a radial recurrence of the f_2'(1525) or to the s\bar{s} member of the 0++ meson nonet.Comment: 7 pages, 5 figures, Invited contribution to LEAP98, Villasimius, Italy, September 199

Management of the orbital angular momentum of vortex beams in a quadratic nonlinear interaction

Light intensity control of the orbital angular momentum of the fundamental beam in a quadratic nonlinear process is theoretically and numerically presented. In particular we analyzed a seeded second harmonic generation process in presence of orbital angular momentum of the interacting beams due both to on axis and off axis optical vortices. Examples are proposed and discussed

Erudita invenzione: riflessioni sulla 'Piccola grande Iliade' di Giovanni Tzetze

La prima tra le numerose opere erudite di Giovanni Tzetze (XII secolo) è costituita dalla 'Piccola grande Iliade' in versi (corredati da un’ampia messe di scolii d’autore), presentata come un’opera scritta “a beneficio dei giovani” che in essa avrebbero trovato riassunta tutta la storia della guerra di Troia. La vasta, anche se a volte magmatica, erudizione dell’autore traspare in molti passi del testo, che come spesso avviene risulta trattato dai filologi moderna semplicemente alla stregua di un monotono repertorio erudito. In realtà, ad uno sguardo più attento risulta come Tzetze avesse spesso un atteggiamento più esplicitamente “creativo” di quanto si potrebbe credere: in più di un caso, dichiara con orgoglio di aver creato “miti” allegorici di sapore omerico per veicolare concetti di ambito fisico e naturale; altrettanto spesso, si identifica con personaggi mitologici o irrompe direttamente nella narrazione, in forme anche abbastanza vivaci. La 'Piccola grande Iliade' si rivela così un’opera erudita, ma nella quale l’ “invenzione” poetica gioca un ruolo importante.The first of the many scholarly works by John Tzetzes (XIIth century) is his 'Little big Iliad', that, along with a large crop of scholia written by the author himself, is presented as a text written “for the benefit of young people”, summarizing the whole history of the Trojan War. Tzetzes’ erudition, wide although sometimes chaotic, shines through in many passages of his poem, which is often considered by modern philologists just a monotonous learned repertoire. In fact, a closer look at it shows that Tzetzes often had an explicitly “creative” attitude: in more than one case, he declares with pride of having created allegorical “myths” with a Homeric flavour, in order to convey concepts pertaining to physics and natural history; just as often, he identifies himself with mythological characters or breaks quite lively in the narrative. Therefore, his 'Little big Iliad' proves to be a scholarly work, but in which poetic ‘invention’ plays a very important role

Optical control of the orbital angular momentum of light: techniques and devices

A theoretical and experimental study of optical vortices and phase singularities has been performed, focusing on generation and control techniques. New devices capable of generating optical vortices have been proposed and manipulation and tuning of the orbital angular momentum of a light beam via linear and nolinear optical processes has been studied and experimentally demonstrated

Optical control of the orbital angular momentum of light: techniques and devices

A theoretical and experimental study of optical vortices and phase singularities has been performed, focusing on generation and control techniques. New devices capable of generating optical vortices have been proposed and manipulation and tuning of the orbital angular momentum of a light beam via linear and nolinear optical processes has been studied and experimentally demonstrated