4,809 research outputs found
A. Coen-S. Seidel, I materiali preromani di Montegiorgio della collezione Gian Battista Compagnoni Natali conservati presso il Museo Archeologico di Ancona,
No full textIn questo studio vengono presi in esame alcuni materiali piceni conservati presso il Museo Archeologico Nazionale delle Marche, provenienti dalla collezione del montegiorgese G.B. Compagnoni Natali, il quale, tra fine Ottocento e inizi Novecento, mise insieme una vasta raccolta archeologica di carattere essenzialmente locale. Alcuni nuclei di questa collezione passarono anche al Museo Preistorico ed Etnografico Luigi Pigorini, al Museo Archeologico di Bologna e al Museo Universitario di Jena. Oltre allo studio dei materiali, il nostro lavoro, grazie al prezioso apporto del materiale archivistico, ci ha permesso di ricostruire le tormentate vicende legate alla vendita della collezione al Museo anconetano e, soprattutto, di individuare alcuni distinti gruppi tombali, provenienti in particolare dalle necropoli delle contrade San Savino e Ferrarini di Montegiorgio, di cui si ha notizia solo dalla documentazione archivistica. Questi dati ci permettono quindi di trarre alcune informazioni più sicure sulla composizione dei corredi tombali montegiorgesi, generalmente conosciuti solo attraverso contesti di dubbia composizione o da materiali decontestualizzati.This work intends to analyse some objects preserved in the Archaeological Museum of Ancona, in Marche, coming from the collection of G.B. Compagnoni Natali from Montegiorgio (AP). He, between the end of the nineteenth and the beginning of the twentieth century, collected a big archaeological collection, composed chiefly of objects coming from Montegiorgio and its environs. Other lots of the Compagnoni’s collection were sold to the University of Jena (1903), the Archaeological Museum of Bologna and the National Prehistoric Ethnographic Museum “L. Pigorini” in Roma. A part from the study of the archaeological material, the archivistic researches have allowed us to know the complicated history of the sale to the Anconetan Museum and to have news about some tomb groups , particularly those from the Ferrarini and San Savino districts, of which we had only few news before. These elements allow us to know better the composition of the tomb equipment of Montegiorgio, before known only by objects out of context or untrustworthy
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)
Climate in motion: science, empire, and the problem of scale/ Deborah R. Coen.
No full textIncludes bibliographical references and index.Today, predicting the impact of human activities on the earth?s climate hinges on tracking interactions among phenomena of radically different dimensions, from the molecular to the planetary. Climate in Motion shows that this multiscalar, multicausal framework emerged well before computers and satellites. Extending the history of modern climate science back into the nineteenth century, Deborah R. Coen uncovers its roots in the politics of empire-building in central and eastern Europe. She argues that essential elements of the modern understanding of climate arose as a means of thinking across scales in a state?the multinational Habsburg Monarchy, a patchwork of medieval kingdoms and modern laws - where such thinking was a political imperative. Led by Julius Hann in Vienna, Habsburg scientists were the first to investigate precisely how local winds and storms might be related to the general circulation of the earth?s atmosphere as a whole. Linking Habsburg climatology to the political and artistic experiments of late imperial Austria, Coen grounds the seemingly esoteric science of the atmosphere in the everyday experiences of an earlier era of globalization. Climate in Motion presents the history of modern climate science as a history of ?scaling? - that is, the embodied work of moving between different frameworks for measuring the world. In this way, it offers a critical historical perspective on the concepts of scale that structure thinking about the climate crisis today and the range of possibilities for responding to it.Introduction: Part I: Unity in diversity. The scales of empire. The work of scaling. Conclusion: Climate and empire -- The Habsburgs and the collection of nature -- The Austrian idea -- The imperial-royal scientist -- The dual task -- The face of the empire -- The invention of climatography -- The power of local differences -- Planetary disturbances -- The forest-climate question -- The floral archive -- Landscapes of desire -- After empire.1 online resource (xiv, 425 pages
La collezione archeologica e il carteggio di Giambattista Compagnoni Natali di Montegiorgio
No full textIl lavoro si propone di ricostruire la figura e la collezione di Gian Battista Compagnoni Natali di Montegiorgio (1843-1920), attraverso il carteggio dello stesso disperso tra il Museo Archeologico di Ancona, il Museo preistorico ed Etnografico L. Pigorini e l'Archivio di Stato di Roma. Grazie al carteggio si sono potuti ricomporre i rapporti che il collezionista ha intrattenuto con i personaggi più in vista dell'archeologia del momento, tra cui Luigi Pigorini, Edoardo Brizio, Innocenzo Dall'Osso, etc. I nuclei della collezione del montegiorgese sono distribuiti tra vari Musei italiani, tra cui quelli sopracitati ed il Museo universitario di Jena, dove arrivò nel 1902 uno dei lotti più cospiscui della raccolta
Natural Deduction Environment for Matita
No full textMatita is a proof assistant characterised by a rich, user extensible, output facility based on a widget for the rendering of MathML Presentation, and by the automatic handling of overloading by means of a flexible disambiguation mechanism. We show how to use these features to obtain a simple learning environment for natural deduction, without modifying the source code or Matita
Orthocypris cicatricosa Coen 1985
No full text<i>Orthocypris</i> cf. <i>cicatricosa</i> Coen, 1985 <p>(Pl. IV: Fig. 12)</p> <p> cf. 1985 <i>Orthocypris cicatricosa</i> nov. sp.; Coen: pl. 9, fig. 16–19.</p> <p> cf. 2013 <i>Orthocypris cicatricosa</i> Coen; Maillet: 169, pl. XXVII, figs. 4–5. 2013 <i>Orthocypris</i> cf. <i>cicatricosa</i> Coen; Maillet: 171, pl. XXVII, fig. 12. cf. 2013b <i>Orthocypris</i> cf. <i>cicatricosa</i> Coen; Maillet <i>et al.</i>: fig. 7I.</p> <p> <b>Material.</b> 2 specimens (2 C).</p> <p> <b>Description.</b> Small, short and ovoidal carapace. Ventral overlap of the larger LV over the RV, and also very slight overlap in the antero-dorsal part. Bow-shaped projection in ventral view. Hmax at 2/5 posterior; Lmax median; Wmax almost median. Well rounded, regularly convex dorsal and ventral margins, converging both anteriorly and posteriorly. Regularly convex and arched anterior margin. Convex posterior margin, more arched in its dorsal part. Anterior and posterior parts of the carapace almost symmetrical. Surface smooth. Fine oblique ridge on the smaller RV, extending from the centre to the postero-ventral part of the valve.</p> <p> <b>Discussion.</b> These specimens remind of those figured by Coen (1985). However, the carapace of the specimens from the Candás Fm is clearly larger than <i>O. cicatricosa</i>, especially since the specimen figured herein shows juvenile features (see Coen 1985).</p> <p> <b>Occurrences.</b> Middle Givetian (Candás Fm, mb C), Asturias (Peran-Perlora section).</p>Published as part of <i>Maillet, Sebastien, Milhau, Bruno, Vreulx, Michel & Posada, Luis-Carlos Sánchez De, 2016, Givetian ostracods of the Candás Formation (Asturias, North-western Spain): taxonomy, stratigraphy, palaeoecology, relationship to global events and palaeogeographical implications, pp. 1-78 in Zootaxa 4068 (1)</i> on page 58, DOI: 10.11646/zootaxa.4068.1.1, <a href="http://zenodo.org/record/270644">http://zenodo.org/record/270644</a>
Coen Beeker’s ‘Urban Fields’ for Addis Ababa
No full textCities under rapid urbanization such as Addis Ababa offer a set of challenges for today’s designers and planners. The urgent need for access to affordable and decent living environments presses city administrations, whose primary response tends to be a top-down approach of public housing projects and allocating plots through a bidding process in which only the affluent become beneficiaries. Such socially selective approaches usually segregate urban dwellers into economic classes and fall short of providing affordable housing options. The formal and informal horizontal sprawl of the city has continued unabated since the mid-1970s and has gained even stronger momentum in the past decade. It is important today to consider options that allow integration instead of segregation and to find options for legal and planned urban environments that deal with peripheral urbanisation. Coen Beeker’s ‘step-by-step’ process of urbanization, which allows gradual changes that promote incremental and adaptable formation of ‘urban fields’ in the peripheries of Addis Ababa, illustrates the possibilities. He argues that access to legally tenured plots of land and further urbanization through measured steps is crucial for developing affordable and cohesive communities in these areas. This paper is an analysis of the pertinent challenges faced by the city of Addis Ababa in relation to peripheral urbanisation and an assessment of Coen Beeker’s proposal to deal with these challenges.OLD Woningbou
O’Brother des frères Coen, un jeu de mémoire(s)
No full textAuteure invitée : Clara Daniel (Aix-Marseille Université) En l’an 2000, Joel Coen réalise O Brother, Where Are Thou?, sur un scénario qu’il a co-écrit avec Ethan Coen : les deux frères terribles du cinéma américain postmoderne récidivent avec une comédie sur le thème de la Grande Dépression dans l’état du Mississipi. https://www.youtube.com/watch?v=AdUV6Sp6WR0 Nous suivons les aventures d’Ulysses Everett McGill (George Clooney), un criminel condamné aux travaux forcés qui s’évade à travers ch..
A short Overview on Mathematicians in Bologna in the First Century after the Establishment of Italy.
No full textThe organizing Committee of the (quadriennal) XIX Congress of Unione Matematica Italiana has delegated prof Salvatore Coen to edit the publication of a volume dedicated to those mathematicians who have been associated with Bologna University from 1861 to 1960. The general idea was that this volume had to consider the many illustrious scientific personages who have carried out their activity in various roles at Bologna’s university (professors and students) during the first century after the unification of Italy. The objective was fully achieved, even exceeded. The work of preparation of the book has developed over a period of about two years. The published volume contains 23 different contributions, written by 28 different authors. The volume consists of about 550 pages. Most of the contributions are of a historical nature with a few being work in mathematical research in Bologna. The studied personalities are Ugo Amaldi, Eugenio Beltrami, Enrico Bompiani, Mario Burgatti Lamberto Cattabriga, Gianfranco Cimmino, Luigi Cremona, Federigo Enriques, Dario Graffi, Beppo Levi, Salvatore Pincherle, Bruno Pini, Beniamino Segre, Leonida Tonelli, Tullio Viola , Giuseppe Vitali and others. The topics covered are varied. We name a few: Non-Euclidean Geometry, Complex Analysis, Differential Geometry, Functional Analysis, Theory of Lie, Algebraic Geometry, Mechanics, , Calculus of Variations, Parabolic Potential theory, Philosophy of Science, Fractional Calculus, Measure Theory , Theory of Lie Groups, Difference Equations, Plane Curves and their Moduli, Linear Constant Coefficients Partial Differential Equations, Cimmino Integrals. New perspectives have appeared studying the work of E. Beltrami through the publication of new important unpublished correspondence. New studies on teacher training schools (Scuole di Magistero) by examining the work of Enriques in the school of Bologna; new studies also on the Italian Encyclopedia of Elementary Mathematics, The figures of F. Enriques and S. Pincherle are each examined by three different contributions
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