100,625 research outputs found
Seismic vulnerability of art objects: the statues of the Galleria dei Prigioni - Galleria dell’Accademia of Firenze
No full textLetter, [Author unclear] to Paulina T. Merritt
No full textHandwritten letter to Paulina Merritt from an unknown author, October 1, 1876.
Seismic isolation technique of marble sculptures at the Accademia Gallery in Florence: numerical calibration and simulation modelling
No full textIsolation technique based on small-size double concave curved surface sliders was studied and applied to Michelangelo’s sculptures placed at the “Galleria dell’Accademia” in Florence, Italy. Starting from preliminary results carried out by some of the authors on such kind of devices, the effect of an enhanced calibration of friction parameters was presented and a number of numerical simulations of both experimental tests and real sculptures under different dynamic conditions were carried out. In particular the experimental tests results were analysed and compared with those obtained for the statues subjected to sinusoidal inputs. Then the sculptures in isolated conditions were subjected to a set of generated accelerograms, compatible with the design spectrum characterizing the Florence site and the main results of the analyses are presented and compared with the case of non-isolated system
Using bioacoustics to assess the presence and species richness of owls and woodpeckers in two differently managed Alpine forests
No full textWoodpeckers and owls are considered important forest naturalness indicators and their presence reflects those of numerous other forest-dwelling species. Because of their habits and behaviour, they are often difficult to detect, and therefore the implementation of the bioacoustics discipline is suited to the survey of such taxa. In the present study we collected data about the presence and species richness of owls and woodpeckers in relation to the main forest structure and composition variables (basal area, dominant height, tree species diversity, living trees’ vegetational conditions, canopy closure percentage, total deadwood volume, decomposition stage) in two forest sites which share similar ecological characteristics, but differ in terms of management: Cajada (non-intensively managed) and Tovanella (abandoned). Both Cajada and Tovanella forests report the presence of bird species belonging to the taxa of woodpeckers and owls. The main explanatory factors for the higher number of contacts of woodpecker and owls in Cajada rather than in Tovanella are the decomposition stage of deadwood and the level of canopy closure. Management practices in Tovanella have been only recently abandoned we think that our results might change in the future. Therefore, further research is needed, also to better assess how sustainable forest management might conserve key forest feature which are crucial for the thriving of most demanding owls and woodpeckers
Mitigazione del rischio sismico per beni artistici mobili: un sistema di isolamento sismico - B1
No full textMitigazione del rischio sismico per beni artistici mobili: un sistema di isolamento sismico
No full textAdvertising and production of a seasonal good for a heterogeneous market: from total segment separability to real media
No full textMarket segmentation is a fundamental topic of marketing theory and practice. We bring some market segmentation concepts into the statement of an advertising and production problem for a seasonal product with Nerlove-Arrow's linear goodwill dynamics, along the lines of some analyses concerning the introduction of a new product. We consider two kinds of situations. In the first one, we assume that the advertising process can reach selectively each segment. In the second one, we assume that one advertising medium is available and that it has a known effectiveness segment-spectrum for a non-trivial set of segments. In both cases we study the optimal control problems in which goodwill productivity of advertising is either linear or concave, and good production costs are (convex and) quadratic. We obtain the explicit optimal solutions using the Pontryagin's Maximum Principle conditions.
Assessment of seismic vulnerability of art objects: The "Galleria dei Prigioni" sculptures at the Accademia Gallery in Florence
No full textThe seismic assessment of art objects requires a multidisciplinary approach and the definition of a specific methodology for evaluating the level of safety and the possible interventions necessary for seismic risk prevention, finding a compromise between safety and conservation. This paper describes a first step in this direction, in which the different aspects of the procedure, from knowledge path of the art object to the structural analysis, were studied in the six Michelangelo's statues located in the "Galleria dei Prigioni" (Slaves' Gallery) at the Accademia Gallery of Florence. We showed that the general principles and criteria expressed in the "Italian Guidelines for evaluation and mitigation of seismic-risk to cultural heritage", which are specifically devoted to masonry constructions, could be profitably extended to other artworks, like statues, starting from historical research, geometrical survey and material characterization, up to the developing of specific methods of analysis. This research could be the base for future studies to be performed concerning the prevention of seismic damage of art objects, including both bare minimum interventions and specific devices, such as isolation systems
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