1,720,970 research outputs found
Suitability of Bactricera dorsalis (Diptera: Tephritidae) egg as food for Harmonia dimidiata (Coleoptera: Coccinellidae)
No full text於室內溫度 25℃ ± 1℃，75% ± 10% RH，光照 14 : 10 (L:D) 小時條件下進行小
十三星瓢蟲 (Harmonia dimidiata (Fabricius)) 取食東方果實蠅 (Bactrocera dorsalis (Hendel)) 卵的發育與生殖試驗。結果顯示取食低壓冷凍乾燥東方果實蠅卵的小十三星瓢蟲幼蟲發育所需時間比取食對照食物 (棉蚜，Aphis gossypii Glover) 者較長，初羽化成蟲的體重也比較輕，但受測的 40 隻幼蟲中有 29 隻能完成發育羽化為成蟲。因此，低壓冷凍乾燥的東方果實蠅卵可視為是小十三星瓢蟲幼蟲合適的 (adequate) 食物。而由成蟲每雌一生總產卵量有 646.6 粒，卵孵化率平均 47.3%，東方果實蠅鮮卵可認為是小十三瓢蟲成蟲合適的食物。此外，若將雄性族群納入考量，日齡別生殖力 (mx，日齡 x 的每成蟲產卵量) ≤ 日齡齡期別生殖力 (fx，日齡 x 的每雌產卵量)，顯示忽視雄性族群的結果，有可能高估族群的增殖力。
Development and fecundity of the lady beetle [Harmonia dimidiata (Fabricius)] fed on the oriental fruit fly (Bactrocera dorsalis Hendel) egg was carried out under conditions of 25 ± 1℃, 75 ± 10% RH, and 14 : 10 (L:D) photoperiod at laboratory. Results showed that the development time of larva raised on fly eggs was longer, body weight of new emerged adult was lighter than that on the reference prey (Aphis gossypii Glover), while 29 of 40 candidate individuals raised on fly eggs could complete to adulthood. The lyophilized B. dorsalis eggs can be considered as the "adequate" food for the larva of H. dimidiata. And can be also as adequate food for adult, because 646.6 eggs with 47.3% of hatching rate produced per female cultured with B. dorsalis eggs. Moreover, the male population is taken into consideration, the age specific fecundity (mx, number of egg produced per individual at age x) is always smaller than the age-stage specific fecundity ( fx, number of egg produced per female at age x). Consequently, the capacity of a population growing may be overestimated if ignore its male population
Spatial Databases: Accomplishments and Research Needs
No full textSpatial databases have been an active area of research for over two decades, addressing
the growing data management and analysis needs of spatial applications such as Geographic
Information Systems. This research has produced a taxonomy of models for space, spatial
data types and operators, spatial query languages and processing strategies, as well as
spatial indexes and clustering techniques. However, more research is needed to improve
support for network and field data, as well as query processing ( e.g. cost models, bulk
load). Another important need is to apply the spatial data management accomplishments
to newer applications such as data warehouses and multimedia information systems. The
objective of this paper is to identify recent accomplishments and the research needs in the
near term.Shekhar, S.; Ravada, S.; Fetterer, A.; Liu, X.; Lu, C.T.. (1997). Spatial Databases: Accomplishments and Research Needs. Retrieved from the University Digital Conservancy, https://hdl.handle.net/11299/215298
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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