1,720,986 research outputs found
Del regime giuridico delle società a partecipazione pubblica: contributo alla delimitazione dell'ambito di diritto dell'amministrazione (della cosa) pubblica
No full textLe società a partecipazione al confine tra diritto (dell'interesse) privato e (dell'interesse) pubblico - L'(evidenza pubblica nell') attività contrattuale - La (necessità) di trasparenza della società - L'(evidenza pubblica nell') assunzione di personale - I poteri dell'ente socio: nomina e revoca degli amministratori - Tra forma e sostanza: la ricerca del regime giuridico dell'amministraizone (della cosa) pubblica
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
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
Electron dynamics in aluminum oxide thin film revealed by Ultrafast Scanning Electron Microscopy (USEM)
No full textWe report about a time resolved measurement of electron dynamics in an aluminum oxide thin film on silicon done by Ultrafast Scanning Electron Microscopy (USEM). This novel technique aims to join the time resolution typical of fs lasers to the spatial lateral and depth resolution of electron microscopy in a single tabletop tool. The USEM apparatus operates in Ultra-High Vacuum regime, and in our pump-probe setup the sample under test is excited both by an UV fs laser pulse and by a delayed electron pulse, triggering the emission of low energy electrons to the detector.
Optical properties in the visible and near UV of wide bandgap insulators are influenced by defects that act as traps for electrons; lifetime and energy of excited states have been studied by time resolved photoluminescence [1]. It’s known from cathodoluminescence measurements that defects may be excited also by the electron beam of a Scanning Electron Microscope (SEM) [2]. Our goal is to evaluate the excitation dynamics of the color centers in an insulator from the secondary electron contrast typical of the SEM images.
The laser‐induced electronic contrast of the alumina film shows a relevant CW contribution, that we attribute tentatively to the photo‐induced carriers within the insulator. Nonetheless, by employing lock-in detection of secondary electrons, it is possible to observe also a fast dynamics with components ranging from hundreds of picoseconds to few nanoseconds. We observed an enhancement of secondary electron emission rising at zero delays and vanishing for positive delay with a time constant of tens of nanoseconds attributed to the excitation of an oxygen vacancy by the laser beam. It was possible to observe a depletion mechanism acting at positive delays and decaying with a tau of tens of picoseconds that was attributed to laser induced surface charging [3]. A third enhancement acting at negative delays and decaying with a time constant of few nanoseconds was attributed to the photoemission of electrons from color centers excited by the electron beam.
[1] B.D. Evans, G.J. Pogatshnik and Y. Chen, Nuclear Instruments and Methods in Physics Research B, 91, 258-262 (1994), Optical properties of lattice defects in α-Al2O3
[2] E.C. Kouroukla, I.K. Bailiff, I. Terryand L. Bowen, Radiation Measurements, 71, 117-121 (2014), Luminescence characterisation of alumina substrates using cathodoluminescence microscopy and spectroscopy
[3] R. Stoian, A. Rosenfeld, D. Ashkenasi, I.V. Hertel, Phyical Review Letters 88, 097603 (2002) Surface Charging and Impulsive Ion Ejection During Ultrashort Pulsed Laser Ablatio
Photon induced charge dynamics in aluminum oxide films by ultrafast scanning electron microscopy
No full text- …
