202,004 research outputs found
Le marché des dessins d’après l’antique à Rome au XVIIIème siècle
No full textL'articolo parte da una ricognizione generale del corpus dei materiali - libri, stampe e disegni - di tema per lo più classico che Richard Topham (m. 1730) lasciò per testameto a Eton College. Coen allarga il quadro d'insieme e fornisce un ragguaglio delle varie imprese del genere, caratteristiche del settecento romano e spesso a beneficio di archeologi, collezionisti e appassionati della cultura romana.The essay starts from a general survey of the corpus of materials - books, prints and drawings - of a mostly classic theme that Richard Topham (d. 1730) left to Eton College. Coen broadens the overall picture and provides an overview of the various enterprises of the genre, characteristic of the Roman eighteenth century and often for the benefit of archaeologists, collectors and enthusiasts of Roman culture
From Nonlinear Integrated Optics to Microresonator Frequency Combs
No full textPerhaps one of the most spectacular current applications of nonlinear integrated optics, a field
which was pioneered by George Stegeman more than thirty years ago [1], is that of nonlinear
microresonator based optical frequency comb light sources. Optical frequency comb sources are
characterized by a spectrum comprising many equally spaced components [2], and have a wide
range of scientific and technological applications. Although commercial comb generators are based
on mode-locked lasers and fiber supercontinuum generation, nonlinear integrated optics provides a
low-cost and chip-scale alternative, based on a low-power cw laser coupled into a high-Q
microresonator [3]. So far microresonator frequency combs have exploited the third order “Kerr”
nonlinearity, which permits to generate successive comb lines with a spacing equal to the resonator
free-spectral range via cascaded four-wave mixing [4-5]. Modeling of microresonator frequency
combs can be greatly simplified by a single partial differential equation approach [4-6], analogous
to the case of other coherently driven Kerr spatially diffractive [7] or temporally dispersive [8-9]
nonlinear cavities. In order to lower the threshold power and extend the spectral range of frequency
comb generation, for example into the visible or mid-infrared, while still using near-infrared cw
laser pumps, quadratic nonlinear cavities can be exploited [10]. These quadratic microresonator
frequency comb sources operate close to the phase-matching condition for the underlying quadratic
processes, and not in the cascading regime that reduces the dynamics to the Kerr case [11]. Quite
remarkably, a single time domain partial differential equation with an effective delayed third-order
nonlinearity was derived to describe with excellent accuracy the dynamics of quadratic frequency
comb generation [12-13]. In situations where multiple processes are present, and the frequency
combs generated around the interacting waves over multiple octaves overlap, we carried out
numerical modeling based on a single envelope equation approach [14].
References
[1] G.I. Stegeman, E.M. Wright, N. Finlayson, R. Zanoni, and C.T. Seaton, J. Lightwave Technology 6, 953 (1988).
[2] T. Udem, R. Holzwarth, and T. W. Hänsch, Nature 416, 233 (2002).
[3] P. Del’Haye, A. Schliesser, O. Arcizet, T. Wilken, R. Holzwarth, and T. J. Kippenberg, Nature 450, 1214 (2007).
[4] S. Coen, H. G. Randle, T. Sylvestre, and M. Erkintalo, Opt. Lett. 38, 37 (2013).
[5] T. Hansson, D. Modotto, and S. Wabnitz, Phys. Rev. A 88, 023819 (2013).
[6] T. Hansson, D. Modotto, and S.Wabnitz, Opt. Comm. 312, 134 (2014).
[7] L. A. Lugiato and R. Lefever, Phys. Rev. Lett. 58, 2209 (1987).
[8] M. Haelterman, S. Trillo, and S. Wabnitz, Opt. Commun. 91, 401 (1992).
[9] F. Leo, S. Coen, P. Kockaert, S.-P. Gorza, P. Emplit, and M. Haelterman, Nature Photon. 4, 471 (2010).
[10] I. Ricciardi, S. Mosca, M. Parisi, P. Maddaloni, L. Santamaria, P. De Natale, and M. De Rosa, Phys. Rev. A 91,
063839 (2015).
[11] G. I. Stegeman, D. J. Hagan, and L. Torner, Optical and Quantum Electronics 28, 1691 (1996).
[12] F. Leo, T. Hansson, I. Ricciardi, M. De Rosa, S. Coen, S. Wabnitz, and M. Erkintalo, Phys. Rev. Lett. 116, 033901
(2016).
[13] F. Leo, T. Hansson, I. Ricciardi, M. De Rosa, S. Coen, S. Wabnitz, and M. Erkintalo, Phys. Rev. A 93 (2016).
[14] T. Hansson, F. Leo, M. Erkintalo, J. Anthony, S. Coen, I. Ricciardi, M. De Rosa, and S. Wabnitz, J. Opt. Soc. Am.
B 33, 1207 (2016)
La necropoli di Monte Abatone dalle indagini della Fondazione Lerici ai nuovi scavi: verso una ricomposizione del quadro culturale
No full textQuadri "da mobilia" e (presunti) capolavori per un pubblico di alto livello: Ludovico Mirri (m. 1786), mercante d'arte nella Roma di Pio VI
No full textLudovico Mirri ricoprì in qualità di editore d'arte e di archeologia, nonché di mercante d'arte, un ruolo di notevole spicco nell'arte e nella cultura romana della seconda metà del XVIII secolo. A Mirri si debbono alcune pubblicazioni di grande impegno e bellezza, come "Le antiche camere delle Terme di Tito" o "Il Museo Pio Clementino", con testi di Giovanni Battista ed Ennio Quirino Visconti. Dopo averlo già trattato come editore, questo saggio illustra l'attività di Mirri in qualità di mercante d'arte: vengono perciò esaminate la merce trattata - ovvero fondamentalmente quadri di antichi maestri italiani e nordici - la loro provenienza, la clientela e infine i sistemi promozionali, fra cui un Catalogo di quadri italiani e 'oltramontani', ovvero nordici, fra cui diversi di Pieter Paul Rubens. Ne emerge una figura nuova, capace di offrire nuovi spunti nella definizione dello scacchiere romano del periodo.Ludovico Mirri, both publisher and art dealer, played a considerable role in Roman art and culture of the second half of the eighteenth century. Mirri produced some publications of great commitment and beauty, such as "Le antiche camere delle Terme di Tito" and "Il Museo Pio Clementino", the latter with texts by Giovanni Battista and Ennio Quirino Visconti. After having already treated him as a publisher, Coen deals now with Mirri's activity as an art dealer: the essay anlyzes Mirri's stock of paintings, their provenance, customers and finally the systems of promotion, including a catalog of Italian and Nordic paintings, including several by Pieter Paul Rubens. The essay gives birth to a new profil, offering new insights into the definition of the Roman culture
188. Holmos e olla con elementi decorativi mobili; 191-193 Kantharos (relativo al cat. 188), 194-196 Kyathos (relativo al cat. 188)
No full textLa principessa della tomba 1 in località Passo Gabella a Matelica.V.b Il banchetto aristocratico e il ruolo della donna
No full text215 (Kantharos), 216 (Coppa), 217 (Vaso situliforme con coperchio), 218 (Calice a corolla con coperchio)
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