1,721,028 research outputs found
Le politiche di bilancio nell’Eurozona: strategie ed evidenza empirica
No full textIn questo saggio vengono esaminati gli effetti di ampie manovre di politica
di bilancio, ovvero di un consolidamento e di uno stimolo fiscale nei
diciotto stati membri dell’Eurozona, in un periodo di riferimento che va dal
1980 al 2015. L’evidenza empirica dimostra che nel caso di uno stimolo fiscale,
una riduzione della pressione fiscale e un aumento della spesa pubblica
in conto capitale generano un aumento del tasso di crescita economica e un
miglioramento dei conti pubblici, mentre l’aumento della spesa corrente ha
effetti opposti. Nel caso di un consolidamento fiscale, una riduzione della
spesa pubblica corrente rispetto a un aumento della pressione fiscale è più
efficace nel comportare un aumento del tasso di crescita economica. Tali risultati
sono confermati attraverso studi di regressione. Il tema oggetto d’analisi è
quanto mai attuale e si inquadra in un filone di ricerca piuttosto recente, che
si arricchisce costantemente di nuovi spunti e suggestioni. I risultati possono
essere particolarmente utili stante le conclamate difficoltà che l’UME sta attraversando
nel riprendere un sentiero di crescita “virtuosa”. In particolare, essi assumono un rilievo particolare per i PIGS, le cui economie sono affette
da “vizi” di lungo periodo
Successful interocular transfer of visual pattern discriminations in split-chiasm cats with section of the intertectal and posterior commissures
No full textInterocular transfer of visual pattern discriminations is absent in split-chiasm cats with a section of cortical commissures and one might conclude that the exchange of visual information necessary for interhemispheric transfer of such discriminations is carried out exclusively at a cortical level. However, section of the cortical commissures influences the activity of the superior colliculus, and the absence of interhemispheric transfer of pattern discriminations following commissurotomy may reflect cortical as well as subcortical modifications. In an attempt to test this possibility sections of the posterior, intertectal and habenular commissures were made in split chiasm cats and interocular transfer was tested and found to be intact. Thus these pathways for across-the-midline transfer of information are not essential in interocular transfer. © 1978
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
Hartley-type algebras in displacement and optimization strategies
No full textAbstractThe Hartley-type (Ht) algebras are used to face efficiently the solution of structured linear systems and to define low complexity methods for solving general (nonstructured) nonlinear problems. Displacement formulas for the inverse of a symmetric Toeplitz matrix in terms of Ht transforms are compared with the well known Ammar–Gader formula. The LQN unconstrained optimization methods, which define Hessian approximations by updating n×n matrices from an algebra L, can be implemented for L=Ht with an O(n) amount of memory allocations and O(nlogn) arithmetic operations per step. The LQN methods with the lowest experimental rate of convergence are shown to be linearly convergent
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
Lack of binocular activation of cells in area 19 of the Siamese cat
No full textSingle cells were recorded in area 19 of 8 Siamese cats. Receptive fields (RFs) were typical for this area in terms of size, directional specificity and type. However, 69 out of the 70 units found were monocularly driven through the contralateral eye. Moreover, the amount of excursion of RFs into the ipsilateral visual field was more limited than that generally demonstrated for areas 17 and 18, extending to a maximum of 5 degrees with very few cells having RFs situated completely within the ipsilateral hemifield
Dispelling the Myths Behind First-author Citation Counts
Full text linkWe 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
Effects of lesions of areas 17, 18 and 19 on interocular transfer of pattern discriminations in split-chiasm cats
No full textSplit-chiasm cats with unilateral or bilateral lesions largely removing the commissurally connected portions of visual cortical areas 17, 18 and 19 showed good interocular transfer of monocularly learned pattern discriminations. The capacity for interocular transfer in these cats was in fact little or not different from that of split-chiasm cats with an intact cortex. Split-chiasm cats with an additional section of the forebrain commissures, as well as two split-chiasm cats with 17-18 lesions also submitted to forebrain commissurotomy after having shown good interocular transfer, were generally incapable of transferring pattern discriminations between the eyes. It is concluded that interocular transfer of pattern discriminations, in split-chiasm cats does not require areas 17, 18 and 19 and must therefore depend on other cortical areas
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