1,721,051 research outputs found
State-of-the-Art Sub-Terahertz and Terahertz Gyrodevices at FIR FU and IAP RAS
Get PDFA review of main results of the subterahertz and Terahertz gyrodevices at the FIR FU (Fukui, Japan) and IAP RAS (Nizhny Novgorod, Russia) has been presented. The frequencies of radiation higher than 1 THz have been obtained at pulse operation regime. The CW generation at 2.2 kW power level was generated in 300 - GHz gyrotron. Gyrotrons operated at cyclotron harmonics demonstrate single-model operation at second cyclotron harmonic with the frequency 395 GHz/100W/CW and at third harmonic with the frequencies of 371 GHz and 414 GHz at 10 kW power level. Promising ideas for smooth frequency tuning and selective excitation of high cyclotron harmonics are discussed.research repor
State-of-the-Art Sub-Terahertz and Terahertz Gyrodevices at FIR FU and IAP RAS
No full textA review of main results of the subterahertz and Terahertz gyrodevices at the FIR FU (Fukui, Japan) and IAP RAS (Nizhny Novgorod, Russia) has been presented. The frequencies of radiation higher than 1 THz have been obtained at pulse operation regime. The CW generation at 2.2 kW power level was generated in 300 - GHz gyrotron. Gyrotrons operated at cyclotron harmonics demonstrate single-model operation at second cyclotron harmonic with the frequency 395 GHz/100W/CW and at third harmonic with the frequencies of 371 GHz and 414 GHz at 10 kW power level. Promising ideas for smooth frequency tuning and selective excitation of high cyclotron harmonics are discussed
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
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
Status of new developments in the field of high-current gasdynamic ECR ion sources at the IAP RAS
No full textThe experimental and theoretical research carried out in the past at the Institute of Applied Physics (IAP RAS)
resulted in development of a new type of electron cyclotron resonance ion source (ECRIS) – the gasdynamic ECRIS. The
gasdynamic ECRIS features a confinement mechanism in a magnetic trap that is different from Geller’s classical ECRIS
confinement i.e. the quasi-gasdynamic one similar to that in fusion mirror traps . Such ion source type has demonstrated
good performance producing high current (100-300 mA) multi-charged ion beams with moderate average charge (Z=4-5
for argon) and especially high efficiency for low emittance hydrogen and deuterium beam formation (500 emA current,
current density up to 700 emA/cm2
and RMS emittance below 0.07 π·mm·mrad). Experimental studies of gasdynamic
ECRIS in a pulsed mode were performed at SMIS 37 facility.The obtained high-level results have stimulated a wide
spectrum of research activities devoted to further extension of the gasdynamic ECR source principles to related fields of
research and applications. The present report overviews recent investigations at the Ion Sources Laboratory connected
with ECR plasma heating by powerful millimeter wave gyrotron radiation. Novel ideas such as using a magnetic field
generated by a single coil for plasma quasigasdynamic confinement for proton beams production, applications of a dense
ECR plasma for H- generation, development of a new CW gasdynamic ECR source with 28 GHz gyrotron heating
among others are discussed.peerReviewe
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