1,721,730 research outputs found
APPLICATION OF ISO 11269-1 ROOT ELONGATION BIOASSAY FOR TESTING THE PHYSICAL PROPERTIES OF GROWING MEDIA
No full textThe ISO 11269-1 root elongation test is currently used for assessing soil quality and is known to be sensitive to soil texture. The aim of this study was to evaluate if the root elongation bioassay can be used to screen growing media, especially on the basis of physical properties, and if its results are comparable with that of other tests such as germination or growth. Results obtained from the application of the ISO 11269-1 test on 21 peat-based growing media coming from the Italian market, showed a wide range of values (from -70 to +90% of the control) indicating the high sensitivity of the bioassay to the root environment. Eleven growing media were also subjected to ISO 11269-2 plant growth bioassay on lettuce and to a germination test with cress and results were compared with those from the root elongation bioassay. Differences on seed germination of cress were detected only for one of the examined growing media. The growth test with lettuce strongly discriminated among products but in a different way from that of the root elongation bioassay, with four exceptions. Results indicated that both ISO 11269-1 and ISO 11269-2 bioassays were responsive to phytotoxicity and that they may be applied to growing media, the first to evaluate physical quality, the latter to estimate plant nutrient availability. Furthermore an attempt was made to develop a fast, simple to carry out and reproducible procedure (treatment of substrate and successive bioassay), responsive to the physical/structural stability of growing media during cultivation. For this purpose, the ISO 11269-1 root elongation test was carried out on eight growing media before and after they had been subjected to alternate drying and rewetting cycles in order to simulate growing conditions. Results showed a deterioration in the quality of four growing media (one peat mixture: two peat and sand mixtures: one sand, peat and clay mixture) caused by the repeated dehydration. The treatment did not affect the results of the bioassay on the other four growing media (one peat mixture: one peat and sand mixture: one peat and MSW compost mixture: one peat and green compost mixture). The preliminary data look promising for the development of the proposed procedure to estimate the impact of cultivation on physical/structural stability of growing media
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
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
Author-wise bibliometric analysis based on entropy.
No full textAuthor-wise bibliometric analysis based on entropy.</p
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