1,721,026 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
The water use efficiency and its determinants in small horticultural farms in Algeria
No full textThe objectives of this study are to calculate the water use efficiency (WUE) and its determinants in small-scale horticultural farms in Jijel-Taher in the Northeast of Algeria. This paper is divided into two main parts. We first start by calculating the scores of technical and water use efficiencies using data envelopment analysis method of a sample of 93 horticultural farms. Secondly, a Tobit regression was used to identify the determinants of WUE. Results showed that average technical efficiency scores are 68% and 79%, respectively, for CRS and VRS assumptions, while average WUE scores obtained are only 51% and 61% under CRS and VRS assumptions, respectively. Tobit regression shows that the total number of cultivated crops and water sources, the percentage of greenhouses, the level of education and technical assistance, the form of commercialization, and the access of farmers to credit are significantly affecting WUE
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
Farmers’ Adaptation to Groundwater Shortage in the Dry Areas: Improving Appropriation or Enhancing Accommodation?
No full textThe objective of this paper is to identify farmers’ strategies to adapt to groundwater shortage in vulnerable arid areas of south Tunisia.
In the selected area, the potential of rainfed agriculture is very limited and groundwater is the only source of irrigation. With intensive
overuse of groundwater signs of groundwater table depletion are starting to appear and farmers are becoming more concerned about
water shortage. Based on a survey among farmers, we proceeded with a ‘principal component factors’ analysis followed by a
‘hierarchical clustering’ using Ward’s method, in order to investigate different farmers’ adaptation behaviour when faced with
groundwater shortage. A set of relevant variables were used for this purpose. The cluster analysis generates three groups of farmers
based on their irrigation practices, types of irrigation investment, and other related structural variables. A first group is formed by large
farmerswho combine both expansive strategies, by investing in enhancing groundwater appropriation, and accommodating strategies,
by enhancing on-farm management of the available resource. The second type of farmers are small and mainly focus on expansive
strategies, while the third group is also composed of small farmers demonstrating purely contractive strategies, referring to reduced
scale of farm operation. Copyright © 2016 John Wiley & Sons, Ltd
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
Stakeholders at the international wheat conference in Abuja loud recent successes in the wheat sector, pledge more support
No full textStakeholders attending the International Conference on Wheat in Abuja, Nigeria lauded the recent successes in reducing wheat importation to Africa and have pledged more support. The stakeholders spoke during the conference organized by the AfDB funded SARD-SC Wheat project of ICARDA that was held from February 27th to March 2nd 2017 to take stock of current efforts on reducing wheat importation burden for the continent and the impact that has been realized by scientists and private sector working through the project. The conference was attended by top wheat scientists and NARS leaders from 15 African countries, senior policy makers, AfDB officials, private sector representatives (millers, input suppliers, financial institutions, service providers) government institutions, model wheat farmers and partner CGIAR centres (IITA, ICARDA, CIMMYT and IFPRI). During the official opening, chief guest Hon. Atiku Abubakar Bagudu, the Kebbi State Governor who is also the leader of the 'Presidential Taskforce on Wheat and Rice' acknowledged the impact that scientists working through the SARD-SC project have had in releasing heat tolerant varieties with better agronomic packages that have led to increase in wheat productivity from an average of 1.5t/ha to above 3.5t/ha at the national level. He however challenged stakeholders to provide scientific data on comparative production costs of wheat in various African countries and their competitors from the global market to enable policymakers to make policies that do not penalize local wheat farmers and actors in the wheat value chain
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