1,720,993 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
Feasibility study of mini RF-helicon-double-layer plasma thruster for microsatellite propulsion
No full textThis paper presents a feasibility study conducted to evaluate the possibility of applying an helicon-double-layer plasma-thruster on UNISAT-class micro-satellite. UNISAT satellites are designed, built and operate in orbit by students, researchers and professors of GAUSS. In the framework of this program four satellite have already been launched (2 years apart one from the other, starting in 2000) by the Baykonour Cosmodrome and a fifth satellite is scheduled to be launched in the 2008. Helicon double layer thruster is an innovative type of plasma thruster firstly proposed by Australian National University (ANU) based on helicon plasma source and Double-layer effect.The paper firstly presents the analysis conducted at GAUSS (Group of Astrodynamics of University "La Sapienza"of Rome ) on UNISAT in order to evaluate the available mass budget, volume budget and power budget. Moreover, the minimum required thruster-performances which can be measured using the available instrumentation onboard UNISAT have been assessed. The main requirements of the propulsion system are: thrust 1mN, specific impulse higher than 1000 s, weight lower than 2kg, volume lower than 1 dm3. Then the thruster has been designed firstly applying a global-model of the helicon source and 1-D PIC code operated by a genetic algorithms in order to identify the best optimum thruster configuration ( respect to system requirements, constrains and performances) and finally using a 2-D PIC code in order to verify and refine thruster performances. Copyright 2007 by the IAF or the IAA. All rights reserved
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
Feasibility study of mini RF-helicon-Double-Layer plasma thruster for microsatelite attitude control
No full textThrusters for micro satellite are currently developed mainly based on FEEP Hall effect concepts and PPTS. This paper is focused on an innovative type of thruster firstly proposed by Australian National University (ANU) based on helicon plasma source and Double-layer effect. The study has been focused on establishing the performances of the helicon thruster in the low power regime ( <40 W) in term of thruster and specific impulse to verify the possibility of using it as actuators for microsatellite attitude control subsystem.
The paper deals with the possibility of applying the helicon Double-Layer thruster, as experimental payload, to the attitude control system of a UNISAT microsatellite in order to evaluate its effective performances. A model of the thruster has firstly been built, control algorithms for achievable maneuvers have been identified combining the thruster model with the UNISAT attitude dynamics model.
UNISAT satellites are designed, built and operate in orbit by students, researchers and professors of GAUSS (Group of Astrodynamics of University “La Sapienza”) at School of Aerospace Engineering. In the framework of this program four satellite have already been launched (2 years apart one from the other, starting in 2000) by the Baykonour Cosmodrome and a fifth satellite is scheduled to be launched in the 2008.
The thruster simulation has been performed through three codes combined together. A global code simulating the plasma source and a one dimensional PIC (PPDL) code simulating the plasma exhaust through the magnetic nozzle. Finally a 2-D PIC code has been applied to analyze plasma detachment. These two codes have been combined through a genetic optimization algorithms in order to identify the best thruster configuration defined as a trade-off among performances , total mass and total volume
Author-wise bibliometric analysis based on entropy.
No full textAuthor-wise bibliometric analysis based on entropy.</p
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