1,721,187 research outputs found
Modelli semplificati sorgente-diffusione-esplosione di nubi di vapore in ambienti industriali semiconfinati
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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
Epidemiology of chronic obstructive pulmonary disease: Health effects of air pollution
No full textCOPD is one of the leading causes of morbidity and mortality in the industrialized and the developing countries. According to the prediction of the World Health Organization, COPD will become the third leading cause of mortality and the fifth cause of disability in 2020 worldwide. In epidemiology, distinct phenotypic entities converge on the term COPD, so that prevalence and mortality data may be inclusive of chronic bronchitis, emphysema and asthma; moreover, the assessment of prevalence rates may change considerably according to the diagnostic tools used. Thus, a considerable problem is to estimate the real prevalence of COPD in the general population. COPD is determined by the action of a number of various risk factors, among which, the most important is cigarette smoking. However, during the last few decades, evidence from epidemiological studies finding consistent associations between air pollution and various outcomes (respiratory symptoms, reduced lung function, chronic bronchitis and mortality), has suggested that outdoor air pollution is a contributing cause of morbidity and mortality. In conclusion, epidemiological studies suggest that air pollution plays a remarkable role in the exacerbation and in the pathogenesis of chronic respiratory diseases. Thus, respiratory physicians, as well as public health professionals, should advocate for a cleaner environment. © 2006 The Authors
Alterazione antropica e zonazione della vegetazione dunale: le spiagge bianche di Rosignano-Vada(LI
No full textL’area di studio è costituita da un tratto di litorale sabbioso lungo ca 2km, nel quale sono inserite le cosidette Spiagge Bianche di Rosignano-Vada.Nel complesso l'area presenta caratteristiche geomorfologiche ed ambientali peculiari e differenti dal resto delle coste sabbiose del litorale livornese. L’attuale arenile di ca 22 ha, è infatti il risultato di depositi recenti (risalenti ai primi decenni del secolo scorso) derivati della produzione della soda e costituiti eminentemente da scorie carbonatiche (prevalentemente CaCo3) che vengono ancora oggi riversate nel mare attraverso un collettore dagli stabilimenti Solvay prossimi alla costa.
In questo contesto, si distinguono tre tipologie geomorfologiche: 1. costa rocciosa piatta/alveolare (a nord); 2. arenile sabbioso e sistema dunale diversamente rilevato; 3. area centrale coincidente con la foce del fiume Fine a morfologia piatta e sedimenti limo/sabbiosi (Fig.1)
La spiaggia, nonostante una profondità media di 100m, è in larga misura afitoica, sia a causa del substrato sia a causa di una elevata pressione antropica stagionale. Oltre a ciò, ove presente, lo stesso sistema dunale appare costituito dalla sola fascia più interna della duna bianca/consolidata.
La flora censita ammonta a c.a. 70 entità la cui frequenza risulta significativamente differente rispetto a quella riscontrabile per le specie (nel complesso le medesime) delle aree sabbiose limitrofe (in particolare dei litorali sabbiosi nord tirrenici).
L’analisi vegetazionale e la zonazione delle fitocenosi rivela da un lato tipologie differenziate in base al contesto geomorfologico, dall’altro modificazioni importanti nella diversa copertura vegetale. E' da rilevare infatti, la pressochè assenza di associazioni tipiche della duna effimera quali il Salsolo kali-Cakiletum maritimae, le cui specie caratteristiche sono estremamente rare e rarefatte e la sua sostituzione con facies degradative a copertura monofitica di Sporobolus pungens . Quest’ultima specie appare dominante, seppure con radi elementi dell’Echinophoro spinosae-Elymetum farcti, anche in ciò che rimane delle dune embrionali, soprattutto a nord del Fine. Gli elementi vegetazionali predominanti riguardano la duna bianca, con consistenti coperture dell’Echinophoro spinosae – Ammophiletum arundinaceae e popolamenti monofitici di Spartina versicolor, quest’ultima spesso compenetrata al Phragmitetum australis s.l. nel settore perifluviale o all’Ammophiletum nelle bassure e incisioni della duna bianca. Il settore della duna consolidata a Juniperus sp.pl., a sud del Fine, appare quello attualmente meno degradato. L’elevata pressione antropica sembra condizionare in larga misura l’assenza o la modificazione di associazioni psammofile altrimenti comuni
Aria indoor e rischi sanitari, il progetto MISSION
Full text linkMission mira a migliorare la qualità dell’aria indoor nelle scuole tramite monitoraggi e interventi, creando una rete interregionale guidata da regione Lombardia, ATS Milano e Università dell’Insubria con 17 partner nazionali di enti sanitari, agenzie ambientali, università e istituti di ricerca
The global burden of chronic respiratory diseases
No full textCurrently, the serious consequences of chronic diseases and their risk factors are not fully
recognised by the international health community. Moreover, chronic diseases are not
only a problem of the ageing population in developed countries. In fact, it has been estimated
that 80% of mortality for chronic diseases occurred in low-income and middleincome
countries in 2005. Thus, the World Health Organization (WHO) Dept of Chronic
Diseases and Health Promotion has suggested a new Millennium Development Goal for
the next few years: to reduce chronic disease death rates by an additional 2% annually,
in order to avert 36 million deaths by 2015
Serum Antibodies Anti-Benzo(a)Pyrene Diol Epoxide-DNA Adducts (BPDE-DNA) and Tobacco Smoking May Predict Respiratory Outcomes in a General Population Follow-Up
No full textAppropriate 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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