1,721,083 research outputs found
Dipterocarpaceae : tree - mycorrhizae - seedling connections
No full textResearch on natural regeneration of Dipterocarpaceae is described. Work in greenhouse experiments, in planting experiments in natural forests and from monitoring of natural regeneration in undisturbed natural forest are discussed. In addition work on photosynthesis measurements is discussed. The findings show that survival of dipterocarp seedlings under closed forest canopies is not related to any chemical soil properties or to light intensities. Best growth takes place nearest to the fine roots of the mother tree. The photosynthesis measurements show that 89% of the time light intensity is not high enough for photosynthesis in the dipterocarp seedlings and that these seedlings survive despite a negative carbon balance from photosynthesis. Sugar analyses of roots and stems show that available carbohydrate is relatively higher in the roots and also higher during the night time than in daytime, while also being higher closest to the roots of the mother tree, indicating a transport of sugars from the mother tree to the seedlings through the ectomycorrhizal connections. It is concluded that in practical forest management this nursing role should be taken in consideration when formulating silvicultural management options, particularly in forest regeneration
Manual persemaian dipterocarpaceace/ edit.: Irsyal Yasman
No full textxii, tak beraturan.: ill, tab.; 21 cm
Manual persemaian dipterocarpaceace/ edit.: Irsyal Yasman
No full textxii, tak beraturan.: ill, tab.; 21 cm
The role of fruit bats in plant community changes in an urban forest in Indonesia
No full textSheherazade, Yasman, Pradana, Dimas H., Tsang, Susan M. (2017): The role of fruit bats in plant community changes in an urban forest in Indonesia. Raffles Bulletin of Zoology 65: 497-505, DOI: 10.5281/zenodo.535775
Fig. S1 in The role of fruit bats in plant community changes in an urban forest in Indonesia
No full textFig. S1. Weak correlation between forearm length of fruit bats and the diameter of fruits consumed (Spearman's correlation test, r = 0.15, df = 175, p <0.05).Published as part of Sheherazade, Yasman, Pradana, Dimas H. & Tsang, Susan M., 2017, The role of fruit bats in plant community changes in an urban forest in Indonesia, pp. 497-505 in Raffles Bulletin of Zoology 65 on page 505, DOI: 10.5281/zenodo.535775
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
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