125,121 research outputs found
Dopo una rilettura dell’Alibrando
No full textIl contributo legge l poema di Albrando nella sua nota relazione con il dipinto di Polidoro da Caravaggio come un momento dello scontro tra francescani e domenicani sulla vendita delle indulgenze nella prima metà del XVI seolo.The paper reads Alibrando's poem in its known relationship with Polidoro da Caravaggio's painting as a moment of the fight between franciscans and dominicans on the selling of indulgenze in the first halfof 16th century
Going Beyond Counting First Authors in Author Co-citation Analysis
No full textThe present study examines one of the fundamental aspects of author co-citation analysis (ACA) - the way co-citation
counts are defined. Co-citation counting provides the data on which all subsequent statistical analyses and mappings
are based, and we compare ACA results based on two different types of co-citation counting - the traditional type that
only counts the first one among a cited work's authors on the one hand and a non-traditional type that takes into
account the first 5 authors of a cited work on the other hand. Results indicate that the picture produced through this non-traditional author co-citation counting contains more coherent author groups and is therefore considerably clearer. However, this picture represents fewer specialties in the research field being studied than that produced through the traditional first-author co-citation counting when the same number of top-ranked authors is selected and analyzed. Reasons for these effects are discussed
Dispelling the Myths Behind First-author Citation Counts
No full textWe conducted a full-scale evaluative citation analysis study of scholars in the XML research field to explore just how different from each other author rankings resulting from different citation counting methods actually are, and to demonstrate the capability of emerging data and tools on the Web in supporting more realistic citation counting methods. Our results contest some common arguments for the continued
use of first-author citation counts in the evaluation of scholars, such as high correlations between author rankings by first-author citation counts and other citation
counting methods, and high costs of using more realistic citation counting methods that are not well-supported by the ISI databases. It is argued that increasingly available digital full text research papers make it possible for citation analysis studies to go beyond what the ISI databases have directly supported and to employ more
sophisticated methods
Reliability of structures to earthquake clusters
No full textRecent literature about life-cycle models for earthquake resistant structures considers that damage accumulation and failure are possibly due to subsequent shocks occurring during the time period of interest. In fact, most of these models only consider the effect of mainshocks. On the other hand, it is well known that earthquakes occur in clusters in which the mainshock represents only the principal (e.g., prominent magnitude) event. Because there is a chance that aftershocks can also cause deterioration of structural conditions, it may be appropriate to include this effect in the life-cycle assessment. Recently, stochastic processes describing the occurrences of aftershocks and their effect on cumulative structural damage have been formalized. These can be employed to develop stochastic damage accumulation models for earthquake resistant structures, accounting for the cluster effect. In the paper, such a model is formulated with reference to simple elastic-perfectly-plastic single degree of freedom systems. Temporal distribution of mainshocks is modeled via a homogeneous Poisson process. Occurrence of aftershocks is modeled by means of non-homogeneous Poisson processes conditional to the characteristics of the triggering mainshock. Approximate closed-form solutions are derived for the reliability assessment under the two hypotheses that total damages produced by events pertaining to different clusters can be assumed to be independent and identically distributed gamma or inverse-Gaussian random variables. An application illustrates the implications of the model on the life-cycle assessment when compared to the case where the effect of damaging aftershocks is ignored
Lo scavo dei via dei Piatti 10-11. Revisione dei rinvenimenti archeologici
No full textIn the area of via dei Piatti 10 – 11 in Milan, conspicuous archaeological remains were found at the beginning of the 1960s, including two remnants of imposing masonry structures, A (the eastern one) and B (the western one), still partially preserved. These are two parallel walls, dated for their construction technique around the 1st century A.D.,
preserved for 30 m in length, but damaged at both ends. Only the foundations and some leftovers of the high remain.
The archive documentation also recalls other poorly known structures (C, D and E) that have been destroyed soon after
their discovery. To the east of the structure A, traces of a pavement were preserved at the time of the excavation, while to the west of B was found a portion of a Roman-era road. During the archaeological investigations, several findings were also recovered, including a bronze applique depicting Virtus or Rome, dated to the 1st century A.D. and referable to the decoration of a sculptural group depicting a triumphal chariot. Therefore, it is possible to date the construction of the monumental complex hosting these elements to the first decades of the imperial era. Few other finds, such as mosaic portions and a pottery pipe, can be considered instead the leftovers of the previous buildings that were torn down on that occasion
Fundamental solutions for Kolmogorov-Fokker-Planck operators with time-depending measurable coefficients
No full textWe consider a Kolmogorov-Fokker-Planck operator of the kind: (equation presented) where n ai j (t) oq i; j=1 is a symmetric uniformly positive matrix on Rq, q ≤ N, of bounded measurable coefficients defined for t 2 R and the matrix B = n bi j oN i; j=1 satisfies a structural assumption which makes the corresponding operator with constant ai j hypoelliptic. We construct an explicit fundamental solution Γ for L, study its properties, show a comparison result between Γ and the fundamental solution of some model operators with constant ai j, and show the unique solvability of the Cauchy problem for L under various assumptions on the initial datum
Interior regularity for weak solutions of ultraparabolic equations in divergence form with discontinuous coefficients
No full textWe prove some interior regularity results for the weak solutions of Kolmogorov equations in divergence for
El comentario de Giorgio Vasari a la vida de Polidoro Da Caravaggio
No full textLa trayectoria artística de Polidoro da Caravaggio comienza en Roma hacia 1518 como colaborador para los trabajos de las Logias Vaticanas dirigidos por Rafael. Posteriormente, le fue confiada la decoración de las fachadas de los Palacios romanos: recreaciones visuales de la historia romana y de la mitología clásica pintadas antes del Saqueo de Roma. Su técnica fue extraordinaria : frescos monocromos siguen la composición en friso, diseño fuerte, vigoroso, inspirado en los relieves antiguos - conocimiento adquirido por la investigación arqueológica practicada en ese período. En nuestros días, el recuerdo de estas fachadas es casi exclusivamente literario. Los frescos en el exterior de los edificios, determinaron el carácter efímero de la decoración. Los historiadores del siglo XVI vieron en Polidoro al artista más fecundo durante el período que va desde la muerte de Rafael hasta el saqueo de Roma, cuya calidad artística rivalizó con las obras de G. Romano, B. Peruzzi y Perin del Vaga
- …
