1,720,954 research outputs found
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
Effects of Soil Type and Moisture on the Pupation Behaviour and Emergence of Heortia vitessoides (Lepidoptera: Crambidae)
Get PDFHeortia vitessoides belongs to Crambidae: Lepidoptera, is the major defoliator of Aquilaria species, significantly lowering agarwood resin production due to partial or complete defoliation. This infestation has led to severe economic losses in several countries, including Sri Lanka. The larval instars of H. vitessoides feed gregariously and voraciously on Aquilaria leaves. Upon maturation, the larvae pupate in the soil which is an essential step in their life cycle. Identifying factors essential for the pupation process is crucial to understand their pupation behaviour, which has not been studied in Sri Lanka, despite the substantial impact of H. vitessoides on Aquilaria tree growth. This study aimed to identify the effect of substrate type and moisture content on the pupation behaviour and to study various stages of its life cycle. First, the saturation level preferred by larvae to pupate in their natural conditions was estimated. No choice tests were conducted using sandy clay loam, clay loam and sandy loam soils under five saturation levels (0%, 25%, 50%, 75% and 100%) with fifth larval instars under controlled conditions in the laboratory. Various stages of life cycle, burrowing and emerging rates were recorded. The experiment was replicated. The study revealed that it takes approximately two days for the fifth instar larvae of H. vitessoides to burrow into the soil for pupation. Adult emergence occurred 13 days after the start of burrowing. The adult moths had a lifespan of about seven days after their emergence. There is a significant effect of soil saturation level and soil type on burrowing and emergence rates, with a significant interaction between these factors. Larvae successfully burrowed into the 25% and 75% saturated substrates in all three soil types, but the emergence rates were significantly very low. In all three substrate types, extremely wet (100%) and extremely dry (0%) saturated substrate resulted in the significantly lowest borrowing rates with zero emergence. Sandy clay loam saturated with 50% was mostly preferred for burrowing and emerging of H. vitessoides, aligning with the natural pupation conditions of H. vitessoides. This study provides insights into the pupation ecology of H. vitessoides, aiding in the development of effective control measures through soil treatment techniques.
Keywords: Heortia vitessoides, Aquilaria, Pupation, Emergence, Saturation leve
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
Pestiferous Occurrence and Suppression of Heortia vitessoides in Agarwood: A Review
Get PDFAgarwood is a resinous wood highly prized in perfumery and pharmaceutical industries. It is produced in the stem, branches, and roots of the Aquilaria and Gyrinops species of Thymalaeaceae family. Aquilaria species are commonly distributed and maintained as plantations in the Asian region which are often attacked by various pests and pathogens. Among them, Heortia vitessoides (Lepidoptera: Crambidae), stands out as the most destructive defoliator in Aquilaria plantations. H. vitessoides larvae feed gregariously and voraciously on foliage, thereby reducing agarwood production, and causing substantial economic losses. Defoliation occurs in varying degrees accounting for 30-70% of planted acres of Aquilaria species monthly, leading to their stunted growth and mortality. Various control methods have been introduced to protect agarwood plantations against H. vitessoides infestations. Biological control measures involve the use of fungi (Beauveria bassiana, Metarhizium anisopliae), predators (Canthecona furcellata), parasitoids (Trichogramma pintoi), and cytoplasmic polyhedrosis viruses. Chemical insecticides (avermectin, spinosad, etc.) have also been widely used, which have caused residues in agarwood, deleterious impacts on the environment as well as to non-target organisms, especially the natural enemies of H. vitessoides, thereby encouraging secondary pest outbreaks. Molecular control includes knockdown of ß-N-acetylglucosaminidase gene to disrupt their molting process and suppression of juvenile hormone diol kinase gene to delay the pest’s pupation. Soil management tactics (moisture content/ substrate type modifications, soil cultivation practices, and mulching) have been investigated aiming at suppressing soil-pupation behaviors to reduce the populations’ emergence success. Trembler grid lamps and trap plants have also been employed to lure pests away from their host plants. In addition, the role of plant-derived volatiles in guiding H. vitessoides females toward their host plants for oviposition has been studied to facilitate the designing of attractants for pest control. Apart from the heavy use of insecticides, none of the above methods are known to be effective in controlling this pest. In view of the above shortcomings of long-practiced control measures, efficient and eco-friendly control measures against H. vitessoides are urgently needed, and use of their pheromones might be a better alternative. Identification and isolation of sex pheromones from H. vitessoides have so far not been reported and would be a challenge, largely due to the nanogram[1]quantities of pheromone released and their proneness in degradation (oxidation, isomerization, and polymerization). Appropriate structural modifications of these natural pheromone compounds, however, can overcome those practical hurdles by developing synthetic analogues (viz. parapheromones), which are more economical, thus replacing natural pheromones in pest control. Hence, organic synthesis of pheromones would lead to introducing a species-specific sustainable way of protecting agarwood from H. vitessoides attacks and to safeguard their economic value while preserving environmental value and biodiversity.
Keywords: Heortia vitessoides, Aquilaria, Defoliator, Control methods, Sex pheromone, plant extract
Author-wise bibliometric analysis based on entropy.
No full textAuthor-wise bibliometric analysis based on entropy.</p
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