1,720,999 research outputs found
Rapporti fra livelli di carsificazione e paleo-linee di riva nelle isole del Golfo della Spezia (Liguria orientale).
No full textRapporti fra livelli di carsificazione e paleo-linee di riva nelle isole del Golfo della Spezia (Liguria orientale)
No full textCave levels and palaeo shorelines in the islands of the La Spezia Gulf (Eastern Liguria). In this paper the first results are presented of a new inventory of the karst caves in the Palmaria, Tino and Tinetto islands, bordering westward the Gulf of La Spezia. These caves are modelled
in the upper Triassic-lower Jurassic limestones and dolomites belonging to the Tuscan Nappe. The two existing inventories, one worked out in the 1950s and the other one twenty years later, have been revised. A data base has been created with the results of a recent survey. Morphometric parameters of the caves (elevation, maximum and minimum width and height
and total length) and the elevation of their entrance have been
measured. Data have been organized in a specially designed worksheet (one for each cave), containing, in addition to the morphometric parameters, a description of the caves morphology and of the different kinds of deposits filling them. Each spreadsheet includes also a map and one or more sections of the cave, obtained updating the old inventories’ maps. The total number of inventoried caves is 21: some of those present in the old inventories have meanwhile been destroyed by quarrying activities and a submerged cave never described before has been added. Most of the caves are above sea level, five are partly flooded by the sea and only two are totally submerged. From a morphometric point of view they have been grouped in two families: one includes those caves that are developed mostly in horizontal and the other those that are equally developed in each dimension. Elevation data cluster suggesting the existence of four cave levels, at -5, +3,+12 and
+32 m a.s.l., that are consistent with the height at which past sea-level markers are reported for eastern Liguria; in this area, therefore, cave levels could be considered due to different Quaternary sea-levels. The new inventory of the karst caves of the Gulf of La Spezia Islands should be regarded as well as a basic tool for their exploitation from a geo-touristic point of view: they should be considered, in fact, part of the natural
heritage of the Natural Regional Park of Porto Venere
Asymptotic Inference in Time Series Regressions with a Unit Root and Infinite Variance Errors
No full textLa value relevance dell'informativa di bilancio nelle scelte di investimento: realtà e percezione. Analisi del contesto italiano e confronto con quello inglese
No full textIl contributo ha come oggetto di analisi la value relevance dei dati di bilancio, in una
prospettiva evolutiva ed internazionale.
In particolare, la rilevanza valoriale dei dati di bilancio viene studiata sotto un duplice profilo:
comparando le due diverse realtà nazionali (Italia e Inghilterra), ma anche confrontando le
risultanze emerse nell’indagine statistica con la percezione dei soggetti coinvolti nella
redazione dell’informativa aziendale.
In prima battuta si esamina quindi l’evoluzione della value relevance di un insieme di
parametri contabili, osservati lungo il decennio 2010-2019, nel contesto italiano e in quello
inglese. Così facendo, è stato possibile ricostruire come si sia modificata la capacità di
influenza, da parte di un determinato set di variabili contabili, sulle scelte di investimento e
studiare le differenze riscontrabili nei due contesti di analisi.
Nella seconda parte, il focus della ricerca è posto sulla percezione dell’importanza
dell’informazione contabile e, più nello specifico, delle singole variabili, da parte di coloro che
redigono o (a vario titolo) portano la responsabilità delle scelte di bilancio.
Infine, si sono incrociati i dati: si è cioè verificato se le percezioni degli operatori aziendali
fossero armoniche con la misura effettiva della value relevance, ottenuta grazie
all’elaborazione statistica effettuata nella prima parte della ricerca empirica
Going Beyond Counting First Authors in Author Co-citation Analysis
Full text linkThe 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
Variations on the Author
Full text link“Variations on the Author” discusses two of Eduardo Coutinho’s recent films (Um Dia na Vida, from 2010, and Últimas Conversas, posthumously released in 2015) and their contribution to the general question of documentary authorship. The director’s filmography is characterized by a consistent yet self-effacing form of authorial self-inscription: Coutinho often features as an interviewer that rather than express opinions propels discourses; an interviewer that is good at listening. This mode of self-inscription characterizes him as an author who is not expressive but who is nonetheless markedly present on the screen. In Um Dia na Vida, however, Coutinho is completely absent form the image, while Últimas Conversas, on the contrary, includes a confessional prologue that moves the director from the margins to the center of his films. This article examines the ways in which these works stand out in the filmography of a director who offers new insights into the notion of cinematic authorship
Appropriate Similarity Measures for Author Cocitation Analysis
Full text linkWe provide a number of new insights into the methodological discussion about author cocitation analysis. We first argue that the use of the Pearson correlation for measuring the similarity between authors’ cocitation profiles is not very satisfactory. We then discuss what kind of similarity measures may be used as an alternative to the Pearson correlation. We consider three similarity measures in particular. One is the well-known cosine. The other two similarity measures have not been used before in the bibliometric literature. Finally, we show by means of an example that our findings have a high practical relevance.information science;Pearson correlation;cosine;similarity measure;author cocitation analysis
Does the development context affect bankruptcy prediction models' general accuracy? A comparative analysis of four multivariate discriminant models in the Italian context.
Full text linkThis research starts from the study by Grice & Dugan (2001) which verified the sensitivity of bankruptcy prediction models to changings in the features of the investigated sample. The study showed that the investigated models’ accuracy was affected by the time-frame, the industry and the size of the firms which composed the investigated samples.
Given these premises, we hypothesized that models applied to samples similar to the one used in their development should reach higher degrees of accuracy than models developed within different contexts. In order to verify this hypotesis, we tested four multivariate discriminant models, one developed within the American context and the others developed in Italy: Altman’s Z’-Score model (1993); Alberici’s model (1975); Bottani, Cipriani and Serao’s model (2004) and Luerti’s model (1992).
We tested the four models twice: first on a sample of firms gone bankrupted within 2012 and 2014. Then on a sample equally composed by bankrupt and operating firms. Both samples were composed by firms located in the Emilia-Romagna region, in Northern Italy.
The first phase of the analysis aimed at verifying the models’ predictive capacity, while the second phase aimed at verifying theirs discriminant capacity. The accuracy of the models was then assessed comparing the results of their application with the real status of each firm.
The results show that even if the Italian models were developed using samples more similar to the one investigated in this research, Altman’s model reaches the highest degree of accuracy
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