1,720,995 research outputs found
Comparison of the carbon, water, and energy balances of mature stand and clear-fell stages in a British Sitka spruce forest and the impact of the 2018 drought
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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
Eucalypts as a genus for short rotation forestry in Great Britain
Full text linkThe study focused on four research objectives:
1. To identify the species and provenances of eucalypts most suitable for biomass production
in Great Britain.
2. To compare growth of eucalypts with other promising short rotation forestry genera.
3. To develop volume and biomass functions for E. gunnii.
4. To estimate yields and patterns of growth for E. gunnii.
Searches on CAB abstracts and World of Science showed that there was limited research
conducted on eucalypts in the UK. This research provides an original contribution to knowledge
through; a long term assessment of the performance of species of cold tolerant eucalypts across
a range of sites, identification of the basis for the rapid growth of eucalypts in comparison with
trees from other genera, identification of the best fit function to describe stem form in E.gunnii
and a characterisation of the pattern of growth in this species.
The thesis provides an account of the long history of eucalypts in the UK, the first record of a
eucalypt being planted in Britain probably being Eucalyptus obliqua in the late 1700s (Aiton
1789). A review is then provided of the experience and constraints to growing nine eucalypt
species in the UK and their potential for short rotation forestry are described. The rapid growth
of eucalypts makes them well suited to short rotation forestry, but there are considerable risks
from frosts and extreme winters.
Results from a trial established in Cumbria, north west England are described. Survival and
growth was compared between E.gunnii, E. nitens and native or naturalised species, identified
by Hardcastle (2006) as having potential for short rotation forestry. The rapid rate of growth of
E. gunnii was attributed to a combination of large leaf area, a long period of growth during the
year and a high specific leaf area. There was 99% mortality of E. nitens at the trial over winter,
preventing comparison with other species. At the same trial and assessment was made of frost
damage during the winter of 2009-2010, which proved to be the coldest for thirty years (Met
Office 2010). E. gunnii was found to be more cold-tolerant than E. nitens, with 35% of the
former surviving the winter and less than 1% of the latter. Larger trees were damaged more so
than smaller trees reinforcing the argument for good silviculture to promote rapid, early growth.
The study on stem form and growth of E. gunnii represents the first in the UK. Volume, height
and dbh of a total of 636 trees, measured by felling, optical dendrometer and terrestrial laser
scanner were used to test the goodness of fit of a volume function developed in France by
AFOCEL and is South America by Shell Oil. The AFOCEL function was found to predict
volume with less bias and be suitable for all but the smallest trees.
Characterisation of growth
curves using mined historic data indicated yields of 16 m3 ha-1 y-1 or approximately 8 t ha-1 y-1 at
20 years old. In contrast, growth curves derived from stem analysis of nine trees from
Chiddingfold (south east England) and Glenbranter (central western Scotland) indicated lower
yields at 7 m3 ha-1 y-1 at age 28 years and 4.5 m3 ha-1 y-1 at age 30 years respectively. Evidence
from plantings elsewhere in the UK show that higher rates of growth are possible, but also that
yields are often compromised by high mortality
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
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
Author-wise bibliometric analysis based on entropy.
No full textAuthor-wise bibliometric analysis based on entropy.</p
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