1,720,964 research outputs found
Ecology Study of Resak (Vatica venulosa subsp. simalurensis) a Threatened Tree on Mursala Island.
No full textVatica venulosa belonging to the Dipterocarpaceae family is known for its high-quality wood for construction. Overharvesting has caused population decline and habitat destruction, increasing the risk of extinction of this species. Due to these threats, the IUCN Redlist classifies it as a critically endangered species. This study found the presence of the threatened plant endemic to Western Sumatra V. venulosa subsp. simalurensis on Mursala Island and its fresh morphology has been successfully documented for the first time. The population structure included 108 individuals (namely 59 seedlings, 46 saplings, 1 pole, and 2 trees) with a dispersed distribution pattern, elevations between 33 and 309 m asl and distances from the coast between 366 and 3136 m. Vegetation analysis identified the dominance of Dipterocarpaceae among 115 species. The diversity index was high (3.76), while the evenness index was low (0.15). Species with the highest INP included Shorea acuminata (37.42%), Hopea bancana (23.07%), and V. venulosa subsp. simalurensis (20.74%). The inverted J-shape structure of stands indicated good regeneration at the research location. Most species, including V. venulosa subsp. simalurensis, had moderate wood density with the estimated capacity of biomass storage around 79.87 tons/ha.56 pagesSkripsi Sarjan
Ecological Study of Kapur Tree (Dryobalanops aromatica) on Mursala Island, Central Tapanuli
No full textDryobalanops aromatica is a type of tree that belongs to the Dipterocarpaceae tribe with conservation status according to the IUCN Red List is Vurnirable (VU) The population of lime trees in Indonesia can be found in the areas of Singkil, Sungai Natal, Sibolga and Padang Sidempuan to Aerbangis. In the western region, it is only found on Mursala Island. The purpose of this study is to determine the ecology of Kapur Tree (Dryobalanops aromatica) which includes population structure, species distribution, and plant community composition as well as density and biomass. In the sample plot of 0.64 ha, there are 76 individuals of Dryobalanops aromatica that live together with several other types of plants, namely 130 species and 53 tribes. The population structure of lime trees is in the shape of a pot, it can grow at an altitude of 17-221 meters above sea level with a slope of 6°-25° and a grouped distribution pattern. A very high diversity index of 4,191. An evenness index of 0.83 indicates maximum uniformity. The structure of the stand is diverse, the density of timber in the medium category and has a total biomass of 452.39 tons/ha.67 PagesSkripsi Sarjan
Ecological Study of Kapur Tree (Dryobalanops aromatica) on Mursala Island, Central Tapanuli
No full textDryobalanops aromatica is a type of tree that belongs to the Dipterocarpaceae tribe with conservation status according to the IUCN Red List is Vurnirable (VU) The population of lime trees in Indonesia can be found in the areas of Singkil, Sungai Natal, Sibolga and Padang Sidempuan to Aerbangis. In the western region, it is only found on Mursala Island. The purpose of this study is to determine the ecology of Kapur Tree (Dryobalanops aromatica) which includes population structure, species distribution, and plant community composition as well as density and biomass. In the sample plot of 0.64 ha, there are 76 individuals of Dryobalanops aromatica that live together with several other types of plants, namely 130 species and 53 tribes. The population structure of lime trees is in the shape of a pot, it can grow at an altitude of 17-221 meters above sea level with a slope of 6°-25° and a grouped distribution pattern. A very high diversity index of 4,191. An evenness index of 0.83 indicates maximum uniformity. The structure of the stand is diverse, the density of timber in the medium category and has a total biomass of 452.39 tons/ha.67 PagesSkripsi Sarjan
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
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
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