1,720,958 research outputs found
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
Peculiarities of initial condition specification in a problem of wave packet propagation in layered fluid
Full text linkThe problem of wave packet propagation along the interface of two semiinfinite fluids with different densities is considered within the framework of a weakly nonlinear model, taking surface tension into account. The method of multiple scales expansions is applied. The analytical analysis of admissible initial conditions is carried out in two stages. In the first stage, the initial perturbation of the free surface is specified as a smooth function symmetric about the central point. This function is expanded into a series of the first harmonics, taking into account the dispersion relation. In the second stage, a sequence of second harmonics is constructed that satisfies the evolution equation, namely, the nonlinear Schrödinger equation
Вiдхилення поверхнi контакту двох рiдких напiвпросторiв з поверхневим натягом: багатомасштабний пiдхiд
No full textЦя стаття присвячена дослiдженню вiдхилення поверхнi контакту мiж двома напiвнескiнченними рiдинами пiд впливом сил поверхневого натягу та гравiтацiї з використанням багатомасштабного аналiзу. Початково-крайова задача базується на ключових безрозмiрних параметрах, зокрема на вiдношеннi густин i коефiцiєнтi поверхневого натягу, для опису генерацiї та поширення хвильових пакетiв уздовж поверхнi контакту. За допомогою слабко нелiнiйної моделi дослiджують початковi вiдхилення поверхнi контакту, що дозволяє отримати iнтегральнi розв’язки для як лiнiйного, так i нелiнiйного наближень. Лiнiйне наближення описує основну структуру прямої та зворотної хвиль, тодi як нелiнiйнi поправки враховують ефекти вищого порядку, якi виводяться за допомогою багатомасштабних розкладiв. Цi поправки характеризують еволюцiю обвiдної хвильового пакета, виявляючи взаємодiю мiж дисперсiєю, нелiнiйнiстю та поверхневим натягом. Надаються iнтегральнi вирази для лiнiйних i нелiнiйних розв’язкiв, зокрема таких, що демонструють роль парних i непарних початкових вiдхилень поверхнi контакту. Порiвняння мiж лiнiйним i нелiнiйним наближеннями пiдкреслюють їх взаємозв’язок. Лiнiйна модель встановлює основну динамiку хвиль, тодi як нелiнiйнi члени додають гармонiки вищого порядку, уточнюючи розв’язки i дозволяючи проводити аналiз стiйкостi. Цi результати виявляють суттєвi внески вiд гармонiк вищого порядку у визначення динамiки поверхнi контакту. Крiм того, у дослiдженнi розглянуто умови, за яких нелiнiйна обвiдна залишається стiйкою, зокрема обмеження на початковi амплiтуди, щоб запобiгти виникненню нестiйкостi. Дослiдження вiдкриває новi перспективи для подальшого аналiзу стiйкостi та динамiки хвиль на межi подiлу рiдин за допомогою символьних обчислень. Потенцiйнi застосування передбачають подальше вивчення поведiнки хвиль за рiзних геометричних параметрiв системи та властивостей рiдин. Отриманi результати сприяють розвитку моделювання гiдродинамiчних хвиль i закладають основу для подальших дослiджень у цiй галузi.This paper investigates the deviation of the interface between two semi-infinite liquid media under the influence of surface tension and gravity using a multiscale analysis. The initial-boundary value problem is formulated based on key dimensionless parameters, such as the density ratio and the surface tension coefficient, to describe the generation and propagation of wave packets along the interface. A weakly nonlinear model is employed to examine initial deviations of the interface, enabling the derivation of integral solutions for both linear and nonlinear approximations. The linear approximation captures the fundamental structure of forward and backward waves, while nonlinear corrections account for higherorder effects derived through multiscale expansions. These corrections describe the evolution of the wave packet envelope, highlighting the interplay between dispersion, nonlinearity, and surface tension. Integral expressions are provided for both linear and nonlinear solutions, including those illustrating the role of even and odd initial deviations of the interface. Comparisons between linear and nonlinear approximations emphasize their interconnectedness. The linear model defines the primary wave dynamics, while the nonlinear terms contribute higher harmonics, refining the solutions and facilitating stability analysis. The results reveal significant contributions from higher-order harmonics in determining the dynamics of the interface. Furthermore, the study explores the conditions under which the nonlinear envelope remains stable, including constraints on initial amplitudes to prevent instability. This research opens new perspectives for further analysis of stability and wave dynamics at fluid interfaces using symbolic computations. Potential applications include the study of wave behavior under various geometric configurations and fluid properties. The findings contribute to advancing hydrodynamic wave modeling and establish a foundation for future research in this field
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
Author-wise bibliometric analysis based on entropy.
No full textAuthor-wise bibliometric analysis based on entropy.</p
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