186,265 research outputs found
Immigrazione e territorio in Abruzzo/Immigration and territory in the Abruzzo region
No full textIl saggio, dopo una breve introduzione che richiama il tema della presenza straniera in Italia, affronta il caso dell’Abruzzo che è passato recentemente da terra di emigranti a regione di immigrazione. Inserito nel contesto geografico centro-orientale della penisola, il fenomeno migratorio rientra qui nel modello d’insediamento a prevalenza balcanica. I primi due gruppi nazionali, albanesi e macedoni, sono concentrati in gran parte nelle aree montane interne e occupati nel settore della pastorizia. Vi è poi una significativa incidenza dei nordafricani e una consistente comunità di senegalesi, dediti soprattutto al commercio ambulante e distribuiti principalmente sul litorale adriatico. Il mondo del lavoro, le necessità abitative, la distribuzione territoriale delle presenze, le dinamiche dell’illegalità e dell’integrazione, il ruolo della società civile e delle istituzioni segnalano l’esistenza di processi trasformativi in una regione in cui un’immigrazione mediamente giovane, ancora quantitativamente modesta e a carattere prevalentemente familiare, tende a divenire sempre più stabile e numerosa.After a brief introduction referring to foreign presence in Italy, this essay deals with the case of Abruzzo, which has recently moved from being a land of migration to a land of immigration. Placed in the central-eastern geographical context of the Italian peninsula, the migration phenomenon is here prevalently of Balkan character. The two prevalent ethnic groups, Albanians and Macedonians, concentrate mainly in the mountain area of the interior and their main activity is as shepherds. There is also a noticeable presence of Northern Africans and a numerous community of Senegalese, mainly engaged in itinerant trade and mainly settled along the Adriatic coast. The world of labour, their needs of habitation, their distribution over the territory, their position respect to illegality and integration, the role of civil society and institutions show the presence of transformation processes in a region in which immigration of a young population on average, still quantitatively moderate and of mainly family character, tends to become increasingly stable and numerous
Author-wise bibliometric analysis based on entropy.
No full textAuthor-wise bibliometric analysis based on entropy.</p
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
Patent ductus arteriosus in preterm infants born before 30 weeks’ gestation: high rate of spontaneous closure after hospital discharge
No full textAim: The aim of this study was to determine the spontaneous closure rate of patent ductus arteriosus at a 2-year follow-up, following failed medical therapy and beyond initial hospital discharge, and to evaluate in-hospital spontaneous or pharmacological closure rates. Materials and methods: A retrospective evaluation was conducted in a cohort of preterm infants admitted to the Neonatal ICU of Ancona between January, 2004 and June, 2013. Inclusion criteria were gestational age between 24+0 and 29+6 weeks or birth weight 1.5 mm, a left atrium-to-aorta ratio >1.4, and/or reversal of end-diastolic flow in the aorta >30% of the anterograde. First-line treatment was intravenous ibuprofen. Intravenous indomethacin was used if ibuprofen failed. Surgical ligation was considered in haemodynamically significant patent ductus arteriosus after medical treatment. Results: A total of 593 infants met the inclusion criteria, and patent ductus arteriosus was diagnosed in 317 (53.4%). Among them, 283 (89.3%) infants had haemodynamically significant patent ductus arteriosus, with pharmacological closure achieved in 228 (80.6%) infants and surgical ligation performed in 20 (7.1%). Follow-up at 24 months was available for 39 (81.3%) of 48 infants with patent ductus arteriosus at the hospital discharge: 36 (92.3%) underwent spontaneous closure, two (5.1%) underwent surgical ligation, and one (2.6%) had a patent ductus arteriosus. Discussion: A significant number of patent ductus arteriosus that fail pharmacological closure undergo spontaneous closure by the age of 2 years. This information should be taken into account when considering surgery or additional attempts of pharmacological closure
Appropriate Similarity Measures for Author Cocitation Analysis
No full textWe 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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