1,720,984 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
RRS Challenger
No full textOne of NERC’s research vessels employed during Atmospheric Chemistry Studies in the Oceanic Environment (ACSOE) cruises
Cryospheric studies of atmospheric trends in stratospherically and radiatively important gases (CRYOSTAT): Abridged Executive Summary of the Final Report
Get PDFTwo of the most pressing environmental problems of the day are human-induced climate change and stratospheric ozone depletion.
CRYOSTAT will undertake the first combined measurements of virtually all significant GHGs (other than water vapour), ODSs, and related trace gases in contiguous firn and ice profiles, spanning as much as 200 years, from both the northern and southern polar ice caps
Atmospheric chemistry speciation studies using the jetstream aircraft: summary report
No full textThis report describes the work actually carried out by ACRU using the Cranfield Jetstream aircraft during the EASE96 and EASE97 ACSOE campaigns in western Ireland. Owing to the financial problems which the ACSOE community faced the final decision about what the Jetstream should do and how much money would be available to do it was made only very
shortly before the work had to begin
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
Firn record of trace gases relevant to atmospheric chemical change (FIRETRACC) project data: BADC help file
Get PDFThis project aims to use "firn air" - air trapped in deep polar snow - to examine the record of trace gases in both the Northern and Southern hemispheres over the last 80 to 100 years. Unlike ice cores, firn extraction yields large volumes (tens of litres) of air for analysis. This allows samples to be circulated between laboratories for repeated analysis of different suites of trace gases at ultra-trace levels. This will enable a detailed picture of the atmospheric composition to be built up in air of different ages. Extensive modelling studies will then be conducted to determine the trends of short-lived reactive species such as ozone, hydroxyl radical, peroxide, formaldehyde, and reactive oxides of nitrogen. Hence we will determine the extent of human impact on the trace gas composition and photooxidant chemistry of the troposphere
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
- …
