1,721,249 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
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
Vacuum design of the Super-FRS at FAIR
No full textThe large-acceptance Superconducting Fragment Separator (Super-FRS) at the Facility for Antiproton and Ion Research (FAIR) at GSI Darmstadt poses peculiar challenges for its vacuum systems. Although the vacuum levels ranging from 1E-5 to 1E-7 mbar for the single-pass beamline are rather undemanding in absolute values, a combination of high level of prompt and residual radiation in the target and pre-separator area, highly outgassing and self-sealing inserts, and large volumes not usually encountered in accelerator systems are setting exceptional demands on the design of the vacuum systems. The radiation environment also has an impact on regular maintenance and emergency intervention strategies as well as on radiation hardness requirements of the standard vacuum components. We present the vacuum layout of the Super-FRS, giving an overview of the major vacuum requirements with pressure profiles from analytical as well as Molflow+ simulations of selected vacuum sectors. Additionally, the solutions implemented for remote handling of the standard and special vacuum components are discussed
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
Acceleration and Phase Space Manipulation of Relativistic Electron Beams in Nano- and Micrometer-Scale Dielectric Structures
No full textThis thesis is about simulations, proof-of-principle experimental setups and first test experiments for new ultra-compact particle accelerators based on dielectric structures. Due to the high damage threshold of nano- and micrometer-scale dielectrics in the optical regime, accelerating fields on the order of GV/m can be achieved. This is more than an order of magnitude higher than what is possible with conventional RF-based technology, overcoming size limitations in high energy accelerators. The Accelerator on a CHip International Program (ACHIP) aims to demonstrate a working prototype of an all-optical, ultra-compact particle accelerator, based on this technology. Being part of the ACHIP collaboration, DESY will conduct related test experiments at its ARES linac.The design of this experiment is a central topic of this thesis. At ARES, it is planned to inject ultra- short relativistic electron bunches into laser-illuminated dielectric grating structures (DLA). The goal of the experiment is to show for the first time net-acceleration with low energy spread growth. In addition to that, a scheme for phase-synchronous acceleration of microbunch trains is planned to be implemented, enabling the demonstration of stable shot-to-shot operation. To this end, the layout of the first experimental area at the ARES linac and several key components were designed. The whole experiment was simulated start-to-end both using well established codes, as well as the novel code DLATracker, which was programmed as part of this thesis. It enables orders of magnitude faster beam simulation in DLA structures compared to traditional particle-in-cell codes. Also, numerical simulation studies were performed to investigate solutions for transverse focusing in DLAs, as well as the challenge of sub-fs synchronization and timing.In addition to the ACHIP-related experiment, two other experiments based on micrometer-scale dielectric lined waveguides (DLW) are proposed in this work. These two experiments can show that dielectric structures are suitable to be used as efficient phase space manipulation and diagnostic devices in both novel and conventional accelerator contexts. In the first experiment, planned to be conducted at the RE- GAE accelerator at DESY, sub-fs bunch length measurement resolution is achieved in simulation using a sub-THz-driven DLW-based transverse deflecting structure (TDS). The second proposed experiment is centered around 3D-printed DLWs that can be used as passive longitudinal phase space synthesizers.This thesis thus explores the physics and the potential of nano- and micrometer-scale dielectric accelerators, describes the design of required proof-of-principle experiments and finally discusses the possible application reach
Author-wise bibliometric analysis based on entropy.
No full textAuthor-wise bibliometric analysis based on entropy.</p
- …
