1,721,011 research outputs found
Semicircular canal dehiscence: a possible direct cause of benign paroxysmal positional vertigo?
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L’articolazione territoriale dello svantaggio sociale in Italia: una nuova misura multidimensionale per piccole aree geografiche
No full textIn questo capitolo si applicano le tecniche della Structural Equation Modelling ai dati del Censimento della popolazione del 2001 per costruire una stima dello svantaggio sociale per piccole aree. I risultati sono stati illustrati per le città di Milano, Roma e Napoli, ma il progetto di ricerca comprende anche altre aree dell’Italia. I risultati sottolineano la necessità di basare l’analisi dello svantaggio sociale sulle caratteristiche delle comunità e delle aree in cui risiedono, anziché fare automaticamente riferimento a modelli per individui, che possono anche non essere appropriati. Una delle conseguenze dell’utilizzo dei dati aggregati è che le definizioni e le teorie che sono state sviluppate con riferimento all’individuo e alla famiglia devono essere riformulate. I risultati confermano il forte dualismo territoriale che caratterizza l’Italia: il comune di Milano risulta quasi uniformemente benestante (con l’eccezione di alcune sacche di povertà), mentre quello di Napoli è caratterizzata da ampie zone di disagio. L’articolazione dello svantaggio all’interno di queste città presenta tuttavia configurazioni territoriali diverse: a Roma e Milano il centro appare in condizioni relativamente omogenee di benessere, mentre le zone bisognose sono collocate, per la maggior parte, nell’entroterra e nei paesi «satellite». A Napoli, invece, le aree benestanti si trovano all’interno della città e si distinguono nettamente dai quartieri popolari. La segregazione socio-territoriale che ne risulta è stata modificata solo in parte durante gli anni novanta a causa della parziale gentrification di alcune zone del Centro Storico
Flammer syndrome: a response to the unknown aspects of acute inner ear troubles?
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Can lateral semicircular canal dysplasia play a role in the genesis of hyperacusis? - La displasia del canale semicircolare laterale può avere un ruolo nella genesi dell’iperacusia?
No full textHyperacusis can be a prominent and disabling symptom of superior semicircular canal dehiscence associated with autophony and the Tullio phenomenon. We report three clinical cases characterized by disabling hyperacusis in which semicircular canals dehiscence was excluded by temporal bone high-resolution computed tomography. The images disclosed lateral semicircular canal dysplasia, characterized by a small bony island, and dilatation of both the anterior and the posterior arms of the lateral semicircular canal. Cochleo-vestibular examinations (pure tone audiometry, infra-red videonystagmoscopy, vibration-induced nystagmus test, vestibular evoked myogenic potentials) will also be described. To verify the transtympanic ventilation tube effect, bilateral myringotomies tubes were performed in one patient but no long lasting subjective benefit was noted. Concerning the pathophysiology of this condition, we hypothesized that the increased volume of inner ear liquid can modify the micromechanical function of the cochlea and the labyrinthine hydrodynamics. In conclusion, in the case of specific symptoms, such as hyperacusis, it is important to consider the possibility of an inner ear morphological alteration involving the lateral canal and vestibule structures, as well as the existence of bony semicircular canal dehiscence
Pulse-wave velocity and benign paroxysmal positional vertigo (BPPV)
No full textBackground: The aetiology of the BPPV is still uncertain. Some factors have been individualized that could explain partly the onset or the tendency to the recurrence, among which traumas, osteoporosis, viral infections and cardiovascular factors of risk. With particular reference to the influence that the cardiovascular factors of risk can practice on the genesis and persistence of the BPPV, it needs to keep in mind that, despite these introduces a role largely sustained in literature, it concerns considerations that hear again of very controversial interpretations however. Purpose: The objective of the study is to try to furnish a good definition of the existing relationship between the VPPB and the rigidity of the arterial tree, reliable expression of the conditions of the vascular circle and easily measurable with the appeal to recent technologies. Primary objective: the definition of possible differences of the profile of rigidity of the vascular system among subjects affections from BPPV and subjects without otologic diseases. Objective secondary: the definition of possible relationships between recidivist of BPPV and profile of vascular rigidity in a population of adults and elderly. Results: The results allow to affirm that an association exists among BPPV and increase of the arterial vascular rigidity, shown from the presence of more elevated values both of cfPWV (carotido-femoral Pulse Wave Velocity) that of differential arterial pressure or pulsatry pressure (PP) in the patients with BPPV in comparison to those measured in the healthy subjects of the same age. Moreover, an association exists between recurrence of the episodes of BPPV and increase of the arterial vascular rigidity in the patients of superior age to 60, shown by the presence of more elevated values of cfPWV in the patients with recurring BPPV in comparison to those measured in the subjects
Chi ha beneficiato delle riforme del nostro sistema di tax-benefit? Le ultime due legislature a confronto.
No full textIl lavoro analizza gli effetti sulla distribuzione personale del reddito dei principali provvedimenti di spesa e di prelievo adottati dai governi di centro-sinistra e di centro-destra nelle due legislature 1996-2001 e 2001-2005. Obiettivo del lavoro è in particolare valutare in termini comparati l’impatto che sulla disuguaglianza e sulla povertà delle famiglie ha esercitato l’azione di governo delle due opposte coalizioni. L’analisi si avvale del modello di microsimulazione Mapp02, un modello di microsimulazione statico in grado di simulare, a partire dalla più recente indagine campionaria della Banca d’Italia sui bilanci delle famiglie, relativa al 2002, i maggiori istituti di prelievo diretto e indiretto (Ire, Iva, Ici, Irap), i principali istituti di spesa a sostegno delle responsabilità familiari e di contrasto della povertà e loro ipotetiche riforme. Il lavoro è così strutturato: il primo paragrafo richiama brevemente i contenuti dei provvedimenti delle due legislature che hanno esercitato un effetto distributivo sul reddito delle famiglie; il secondo descrive la metodologia, ovvero il data set e il modello di microsimulazione impiegati nonché le ipotesi sottostanti agli scenari controfattuali impiegati per valutare l’impatto delle misure introdotte dal legislatore; il terzo e il quarto presentano i risultati dell’analisi distributiva, distinguendo l’impatto prodotto dai singoli provvedimenti da quello della normativa nel suo complesso; il quinto infine propone alcune conclusioni sui principali risultati emersi
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
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