1,720,971 research outputs found
Going Beyond Counting First Authors in Author Co-citation Analysis
Get PDFThe 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
Get PDF“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
Get PDFWe 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
Laser processes on surfaces in femtosecond domain
Get PDFIn this thesis we investigated the interaction between ultrafast pulses
(<_ 10 ps) and nanometric dielectric surfaces. The study of the interaction
between this kind of pulses and matter has a great importance in many types
of application, principally for the reduced thermal effects and for the high
precision achievable in the realized structures. Particularly, our work was
interested in the solar industry application where an ultrafast laser source
can be used to open the contacts in the passivation layer which covers the
back side of the PERC solar cells. The study involved the characterization of
the process in function of the surface, pulse length, different wavelengths and
different average intensity. Subsequently the processed samples analysis with
the use of SEM and EDX. The results have demonstrated that the removal
of dielectric material can happen due to direct or indirect ablation and has
highlighted the regimes in which there is a clean and precise delamination of
the material without damaging the silicon substrate.
This study was realized thanks to the collaboration between Università degli
Studi di Padova and Applied Material Italia that has financed the project
and, especially, cared for the production and the testing of solar cellsope
VUV source for two-color dynamics studies at FLASH2
No full textFree electron lasers (FELs) and high order harmonic generation (HHG) sources produce ultrafast coherent extreme ultraviolet (XUV) and X-ray radiation. These two powerful sources are optimal tools for time-resolved studies of ultrafast dynamics due to their high spatial and temporal resolution. Common time-resolved studies make use of pump-probe schemes, where a first pulse triggers a dynamics and a second delayed pulse probes the status of the target at a known moment in time. Split-and-delay units are often employed in order to separate the pump and probe pulses provided by a single high photon flux source. Alternatively, a second synchronized source can be added for two-color experiments. In this case, the two photon energies are chosen accordingly to the process under investigation. Typically, the spectral range covered by secondary sources spans from the ultraviolet to the THz range. However, the parameter space can be extended by combining two separate short-wavelength systems, such as a FEL and a HHG-based beamline. Such con figuration bene fits from the sources complementary properties, opening a new regime for two-color studies in the XUV/X-ray range. The permanent integration of a HHG-based source in a FEL endstation was recently realized for the first time at the free electron laser FLASH and is presented in this thesis work. Preliminary studies on the source confi guration and pressure calculations allowed to design a compact and reliable system, able to encounter the challenging vacuum requirements given by the ultra high-vacuum FEL endstation. The HHG process is driven by a OPCPA laser system, synchronized with the unique FEL burst timing, which delivers femtosecond pulses used for the generation of vacuum ultraviolet (VUV) light in a gas target. The emitted radiation is resolved in a compact in-line spectrometer and can be spectrally tuned by means of a rotatable double fi lterwheel. A hyperboloidal carbon-coated mirror allows for the coupling in the FEL endstation where the VUV beam is focused into a reaction microscope (REMI). First commissioning results have shown the generation of radiation from 10 to 40 eV with pulse energies up to 0.1 nJ and the successful focusing in REMI down to a 20 μm diameter spot. Photo-electron momentum measurements in argon indicate the source capabilities for future pump-probe experiments
Dispelling the Myths Behind First-author Citation Counts
Get PDFWe 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
Author-wise bibliometric analysis based on entropy.
No full textAuthor-wise bibliometric analysis based on entropy.</p
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