1,721,008 research outputs found
Il ruolo delle telecomunicazioni
No full textDa anni il settore delle telecomunicazioni, con gli altri servizi di pubblica utilità, sta attraversando profondi mutamenti e, anche se molto è cambiato, l’assetto definitivo non è ancora stato raggiunto, anzi esistono tuttora posizioni contrastanti sui fattori che dovranno caratterizzare il settore al termine del processo. Nell’ultimo decennio la giustificazione economica e in particolare la compatibilità con i principi dell’ordinamento comunitario dei monopoli e dei diritti speciali che hanno caratterizzato l’organizzazione del settore dei servizi di pubblica utilità è sempre più stata messa in discussione e si è assistito ad una dialettica, talvolta aspra, tra i protagonisti di tale cambiamento. Da una parte abbiamo i titolari, o ex-titolari, dei diritti speciali o esclusivi e quanti in genere si oppongono all’estensione delle regole di mercato. Dall’altra vi sono i nuovi e i potenziali partecipanti al mercato e le autorità a tutela della concorrenza e di regolamentazione, che spingono verso l’applicazione di tali regole volte a consentire una reale e più veloce apertura dei mercati. Il settore delle telecomunicazioni (tlc) fornisce un interessante esempio di questa rivoluzione in atto. Quello che una volta era definito come il mercato stabile e non competitivo sia del servizio telefonico che dell’industria manifatturiera ad esso collegata è ora un settore sempre più concorrenziale. Questo processo, iniziato con la liberalizzazione del mercato dei terminali d’utente e, successivamente, dei servizi a valore aggiunto e della trasmissione dati, interessa oggi tutti i mercati. Decisivo e insostituibile in questa fase di liberalizzazione è stato il ruolo svolto dalle istituzioni comunitarie. Le politiche di liberalizzazione non hanno, però, sempre trovato un contesto di agevole applicazione a motivo delle resistenze alla piena apertura alla concorrenza di quei settori in cui tuttora esiste l’esigenza di garantire un insieme uniforme di prestazioni, a condizioni ragionevoli, a chiunque ne faccia domanda. Con difficoltà è passata l’idea che l’isolamento dal contesto concorrenziale non avrebbe fatto altro che ridurre gli incentivi all’innovazione e al miglioramento della qualità dei servizi offerti. Si è trattato pertanto di individuare delle soluzioni regolamentari per i settori nei quali permangono degli obblighi in termini di servizio pubblico. La liberalizzazione non ha implicato la completa abolizione del controllo pubblico, ma una sua trasformazione in termini di finalità che si propone, di soggetti che lo esercitano e di strumenti utilizzati
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
The use of thermogravimetry in the physicotechnological characterization of hydrophilic ointment
No full textBiochemical and physiological aspects of 2,5-hexanedione: endogenous or exogenous product?
No full textThis article reports results regarding two different physiological aspects of 2,5-hexanedione (2,5-HD). The first is the relationship between "free" 2,5-HD (the fraction of "real" 2,5-HD) and "total" 2,5-HD (2,5-HD obtained from acid hydrolysis) in urine and blood of workers exposed to n-hexane. The second part of the study is an attempt to clarify "physiological" excretion of 2,5-HD in subjects not occupationally exposed to n-hexane. The concentration of free 2,5-HD in urine of workers exposed to n-hexane is about 8% of total urinary 2,5-HD. In blood, free 2,5-HD is about 50% of the total. The serum concentration range of total and free 2,5-HD in workers from whom blood was taken was 33-418 micrograms/l and 14-283 micrograms/l respectively. In subjects not exposed to n-hexane, urinary concentration of 2,5-HD ranged between 0.17 and 0.98 mg/l, the urinary excretion rate between 0.23 and 0.57 microgram/min, and renal clearance between 14 and 66 ml/min. The blood concentration of 2,5-HD in nonexposed subjects was 6-30 micrograms/l. Fluctuations typical of a circadian rhythm were not observed for 2,5-HD in blood or urine. We think that 2,5-HD is mainly a product of intermediate metabolism in the human body. Only a minimal part could derive from n-hexane as a ubiquitous micropollutant
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
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
koamabayili/VECTRON-author-checklist: VECTRON author checklist
No full textWe have done our best to complete the author checklist relating to the use of animals in the hut study. Note that the objective for the hut study was to evaluate the IRS treatment applications for residual efficacy against Anopheles mosquitoes, including the local An. coluzzii mosquito population. Cows were only used to attract mosquitoes into the huts and no tests were carried out directly on the cows. The author checklist is intended for use with studies where experiments are carried out on animals, which is why we have had such difficulty in completing this for the hut study, as many of the questions do not relate to how the cows were used
- …
