1,355,872 research outputs found
Modanature a stucco nell'ex Palazzo della Borsa a Riga (Lettonia)
No full textpubblicazione nell'ambito dell'Assegno di ricerca "Tecniche diagnostiche e di intervento nel cantiere di restauro" - settore Icar 19/Restauro aa 2009-201
Tests of quantum-gravity-induced nonlocality via optomechanical experiments
No full textThe nonrelativistic limit of nonlocal modifications to the Klein-Gordon operator is studied, and the experimental possibilities of casting stringent constraints on the nonlocality scale via planned and/or current optomechanical experiments are discussed. Details of the perturbative analysis and semianalytical simulations leading to the dynamic evolution of a quantum harmonic oscillator in the presence of nonlocality reported in [A. Belenchia, D. M. T. Benincasa, S. Liberati, F. Marin, F. Marino, and A. Ortolan, Phys. Rev. Lett. 116, 161303 (2016)PRLTAO0031-900710.1103/PhysRevLett.116.161303] are given, together with a comprehensive account of the experimental methodology with particular regard to sensitivity limitations related to thermal decoherence time and active cooling of the oscillator. Finally, a strategy for detecting nonlocality scales of the order of 10-22÷10-26 m by means of the spontaneous time-periodic squeezing of quantum-coherent states is provided
Integrazioni di profili architettonici in scagliola nell'ex Palazzo della Borsa a Riga (Lettonia)
No full textpubblicazione nell'ambito dell'Assegno di ricerca "Tecniche diagnostiche e di intervento nel cantiere di restauro" - settore Icar 19/Restauro aa 2009-201
«Com’è un mafioso?» Raccontare dall’interno il “mestiere” del poliziotto
No full textIl saggio analizza il racconto autobiografico che Maurizio Ortolan, (ispettore di polizia in servizio dal 1987 al 2013 presso il Nucleo centrale anticrimine) fa della sua esperienza lavorativa, con taglio asciutto ed essenziale, denso di rimandi a importanti episodi delle cronache criminali italiane degli ultimi trent’anni e carico di un vissuto che ha incrociato le biografie di alcuni dei più significativi protagonisti di quel periodo. Utilizzando uno sguardo etnografico e partendo dal racconto di Ortolan, l'autrice fa emergere quegli aspetti che, pur strettamente legati al singolo vissuto, gettano luce sulle pratiche condivise del "mestiere" del poliziotto
Gravitomagnetic resonance in the field of a gravitational wave
No full textUsing the construction of the Fermi frame, the field of a gravitational wave can be described in terms of gravitoelectromagnetic fields that are transverse to the propagation direction and orthogonal to each other. In particular, the gravitomagnetic field acts on spinning particles and we show that, due to the action of the gravitational-wave field, a new phenomenon - which we call gravitomagnetic resonance - may appear. We give both a classical and a quantum description of this phenomenon and suggest that it can be used as the basis for a new type of gravitational-wave detectors. Our results highlight the effectiveness of collective spin excitations, e.g., spin waves in magnetized materials, in detecting high-frequency gravitational waves. Here we suggest that, when gravitational waves induce a precession of the electron spin, power is released in the ferromagnetic resonant mode endowed with quadrupole symmetry of a magnetized sphere. This offers a possible path to the detection of the gravitomagnetic effects of a gravitational wave
Burnt forest clear-cuts, a breeding habitat for ortolan bunting Emberiza hortulana in northern Sweden?
No full textThe Ortolan Bunting population has decreased in Sweden by about 80 % since 1975. Nowadays, the largest part of the Ortolan Bunting population occurs on the northern coast
where the majority breeds on clear-cuts. The aim of the study was to describe the Ortolan Bunting breeding habitat characteristics in northern Sweden to provide a basis for
management plan. In Phase 1, I investigated if Ortolan Buntings were more present on prescribed burnt clear-cuts than on non-burnt clear-cuts with a presence/absence survey.
Unfortunately the occupancy rate in the study area appeared to be very low. As a second step, I extended the study on habitat characteristics within a study area closer to the coast (Phase 2). There was a positive relationship between clear-cut size and Ortolan Bunting presence, but when accounting for random spatial distribution, presences on small clearcuts were as common or even higher as on large ones. Proximity to farmland had no significant effect on presence of Ortolan Bunting. These two conclusions may be explained by the fact that Ortolan Buntings had the possibility to use multiple clear-cuts and thus find
additional resources on a nearby clear-cut, relaxing resource shortage on the clear-cut of the nesting territory. Within 70 km from the coast, there was no coast-inland gradient in Ortolan Bunting presence. The studied parameters could not explain the low Ortolan Bunting presence in the studied area used in Phase 1 but they supplied management plan of the species by pointing out that prescribed burning did not seem to have to take into
account neither clear-cut size, distance to farmland nor distance to the coast (< 70 km). This study also provided some information for future researches about the distribution of the Ortolan Bunting in the region and pointed out further questions to be considered to get a
global vision of Ortolan Bunting breeding habitat in the region
Unravelling migration connectivity reveals unsustainable hunting of the declining ortolan bunting
No full textIn France, illegal hunting of the endangered ortolan bunting Emberiza hortulana has been defended for the sake of tradition and gastronomy. Hunters argued that ortolan buntings trapped in southwest France originate from large and stable populations across the whole of Europe. Yet, the European Commission referred France to the Court of Justice of the European Union (EU) in December 2016 for infringements to legislation (IP/16/4213). To better assess the impact of hunting in France, we combined Pan-European data from archival light loggers, stable isotopes, and genetics to determine the migration strategy of the species across continents. Ortolan buntings migrating through France come from northern and western populations, which are small, fragmented and declining. Population viability modeling further revealed that harvesting in southwest France is far from sustainable and increases extinction risk. These results provide the sufficient scientific evidence for justifying the ban on ortolan harvesting in France
Habitat use of Yellowhammers Emberiza citrinella, Ortolan Buntings E. hortulana, and Corn Buntings Miliaria calandra in farmland of east-central Poland
No full textWe studied the habitat use of the Yellowhammer, Ortolan Bunting, and Corn Bunting during 1995–2000 in an agricultural landscape in east-central Poland (total area of 46.5 km 2). Using the Jacobs D preference index, we found that Yellowhammer preferred woods and avoided areas with settlements. Ortolan Bunting preferred woods and avoided areas with settlements. Corn Bunting preferred grassland and wastelands, but avoided woods and areas with settlements. A comparison of the proportions of different habitat types in breeding territories of birds showed the most similarity between Yellowhammer and Ortolan Bunting, less similarity between the Yellowham-mer and Corn Bunting, and the largest differences between Ortolan Bunting and Corn Bunting. We found positive correlation between the number of wooded patches and both the numbers of the Yellowhammer and Ortolan Bunting. Yet the length of wood margins had a positive effect only on the Yellowhammer. The Yellowhammer avoided wood-field ecotones as compared with wood-grassland ecotones, whereas the Ortolan Bunting showed an opposite tendency. Habitat preferences of bunting species seem to differ in different parts of a species range. In general these three species occupied diversified farmland in Poland. Their survival will thus depend on the maintenance of habitat diversity. The planned afforestation of poor soils can reduce numbers of Corn Bunting but enhance numbers of Yellowhammer and Ortolan Bunting. Rotational fallowing of arable land will promote Corn Bunting
Dixon's extended bodies and impulsive gravitational waves
No full textThe “reaction” of an extended body to the passage of an exact plane gravitational wave is discussed following Dixon's model. The analysis performed shows several general features, e.g. even if initially absent, the body acquires a spin induced by the quadrupole structure, the center of mass moves from its initial position, as well as certain “spin flip” or “spin glitch” effects which are being observed
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