1,720,955 research outputs found
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
Techno-economic analysis of the use of fuel cells and hydrogen in the railway environment
No full textU ovome će radu biti predočeno trenutačno stanje („state of the art“) tehnologije,
ekonomska opravdanost i tržišni potencijal za FCH („Fuel Cell Hydrogen“) tehnologiju u
željezničkom sektoru. Pokazano je da se FCH tehnologija može nositi sa željezničkim
prijevozom. Nakon pregleda stručne literature napravljena je tehno-ekonomska analiza
trase Split-Trogir. Korištenjem simulacija jednog vlaka (STS) dobiven je energetski profil
trase. Metodom ekvivalentnog godišnjeg troška (EAC) uspoređene su tri tehnološke
varijante vlakova (dizel, FCH i OLE). Dobiveni rezultati, za navedene pretpostavke i
tehno-ekonomske parametre, za trasu Split-Trogir daju prednost elektrifikaciji nadzemnim
vodom (OLE). FCH tehnologija također ima povoljniji EAC od dizel tehnologije koja se
pokazala kao najlošija opcija.This thesis will present the current state, economic viability and market potential for FCH
(Fuel Cell Hydrogen) technology in the railway sector. It has been shown that FCH
technology can handle rail transport. After reviewing of the literature, a techno-economic
analysis of the Split-Trogir route was made. Using single train simulations (STS), the
energy profile of the route was obtained. The equivalent annual cost (EAC) method
compared three train technology variants (diesel, FCH and OLE). The obtained results, for
the stated assumptions and techno-economic parameters, for the Split-Trogir route gave
advantage to catenary electrification (OLE). FCH technology also has a more favorable
EAC than diesel technology which has proven to be the worst option
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
Basic principles of magnetohydrodynamics and its application on fusion
No full textRad ne sadrži sažetak
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
Time resolution in scintillator based detectors for positron emission tomography
No full textHighest time resolution in scintillator based detectors is becoming more and more important in applications for high energy physics and medical physics. In the domain of medical photon detectors L(Y)SO scintillators are commonly used for positron emission tomography (PET). The interest for time of flight (TOF) in PET is increasing since measurements have shown that new crystals like L(Y)SO coupled to state of the art photodetectors, e.g. silicon photomultipliers (SiPM), can reach coincidence time resolutions (CTRs) of far below 500ps FWHM. Several commercial whole-body TOF-PET scanners further demonstrated that already a clear improvement in image signal to noise ratio (SNR) and contrast can be achieved with time resolutions of the order of 500ps. However, CTRs smaller than 100ps FWHM are necessary to benefit of the image SNR improvement to such a level where scanning times and radiation exposure to the patient can be significantly reduced. To achieve these goals it is important to study and understand the individual processes and the associated time evolution in the whole detection chain, i.e. the high energy particle or gamma interaction in the crystal, the scintillation process itself, the light propagation in the crystal with the light transfer to the photodetector, and the electronic readout. In this work, study of time resolution measurements is reported, comparing the performance of two different readout electronics – NINO and HRFlexToT with three different configurations of silicon photomultipliers coupled to scintillating crystals
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
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