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Динамика показателей фитопланктона в реке Халда (рыбохозяйственное наследие Багабанду), Читтагонг, Бангладеш
No full textThe Halda is a river ecosystem of major importance, well-suited for the natural spawning of major carps due to the unique physicochemical and biological properties of its water. The productivity of the Halda ecosystem mainly depends on the plankton density. The present study has been aimed at the determination of qualitative and quantitative density of the phytoplankton in the Halda River during a two-year period extending from January, 2017 to December, 2018. Phytoplankton density is a good indicator of the water quality of a river ecosystem. A total of 74 species of phytoplankton divided into 47 genera belonging to 6 phyla has been recorded. Bacillariophyta was the most dominant phylum of phytoplankton followed by Cyanobacteria, Chlorophyta, Miozoa, Charophyta, and Euglenozoa. The maximum phytoplankton density was recorded during the pre-monsoon period, and its minimum fell upon the post-monsoon period. The phytoplankton showed a positive significant relationship with transparency, total dissolved solids, conductivity, calcium, total hardness, and BOD5 and an inverse significant relationship with water temperature. The water of the Halda River is organically polluted and eutrophic in its nature.Халда — важная речная экосистема, чьи уникальные физико-химические и биологические характеристики обеспечивают благоприятные условия для естественного нереста крупных карповых рыб. Продуктивность экосистемы Халды в значительной степени зависит от плотности планктона. Данное исследование было направлено на определение количественной и качественной плотности фитопланктона в реке Халда в течение двухлетнего периода, продолжавшегося с января 2017 по декабрь 2018 г. Плотность фитопланктона служит хорошим индикатором качества воды в речной экосистеме. Всего было обнаружено 74 вида фитопланктона, относившихся к 47 родам и входивших в 6 классов. Доминирующим классом фитопланктона был Bacillariophyta, за ним следовали Cyanobacteria, Chlorophyta, Miozoa, Charophyta и Euglenozoa. Максимальная плотность фитопланктона была зафиксирована в предмуссонный период, а минимальная — в послемусонный. Фитопланктон продемонстрировал статистически достоверную прямую зависимость от таких характеристик воды, как прозрачность, общая минерализация, проводимость, содержание кальция и общая жесткость, и достоверную обратную зависимость — от температуры воды. Вода в р. Халда загрязнена органическими веществами и по своей природе является эвтрофической.PublishedReferee
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
Some analytical integration formulas for trapezoidal shape quadrilateral elements of Lagrange family
No full textThis paper concentrates on some analytical integration formulas of rational functions having higher order polynomial numerators with linear univariate denominators. These integrals arise in finite element formulation of second-order partial differential equations provided that a trapezoidal shape quadrilateral element is normalized w.r.t. 2-square in a local parametric two-dimensional space isoparametrically or subparametrically. Explicit evaluation of these double integrals can be expressed as a product of two single variate integrals which produce simple analytical finite element relations. An efficient and simple method is also proposed to find the global derivatives and their products. In addition, some formulas of the rational integrated expressions are tabulated for the computational purpose which can be easily coded and save much computational time. The performance is demonstrated by means of two numerical examples, the first example considers a discretization made up of a single trapezium-shaped element and the other example considers an arbitrary quadrilateral geometry which is further discretized by means of three trapezium-shaped quadrilateral elements. Copyright © 2000 John Wiley & Sons. Ltd
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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