1,720,984 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
The role of sustainable materials in carbon capturing
No full textCarbon capturing utilisation and storage (CCUS) is a necessary step forwards to achieve the environmental sustainable development goals (SDG). Carbon capturing can be achieved either through chemisorption or physisorption mechanisms. A variety of materials and mechanisms are being researched to determine the efficiency of carbon absorption methods to achieve the environmental SDGs as the carbon capturing process requires to be efficient and effective. Several materials such as metal organic frameworks, carbon nanotubes, biochar, activated carbon, cement dust and other materials are being tested to establish the processes at pilot scale for industrial applications. This research focuses on the physisorption method of carbon capturing using the waste products of the cement industry – cement bypass dust and flue gases. Carbon absorption efficiency in physisorption mechanisms also depends on the available CO2 concentration, moisture content of bulk material, reaction time efficiency of a reactor, and temperature conditions. The changes in material properties during carbon capturing processes due to changes in moisture, temperature, increased residence time impacts the handleability of materials in bulk quantities. This research focuses on improving the carbon capturing efficiency, and improving the handleability of bulk materials at industrial scale
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
Optical Cavity Soliton and its Dynamics
No full textPh. D. Thesis on theoretical Nonlinear OpticsThis thesis presents a theoretical study of generation and dynamics of cavity solitons in microcavities. We consider a wide area semiconductor cavity system that comprised of a vertical-cavity surface-emitting laser coupled with frequency-selective feedback. Three different cavity nonlinearities; cubic, cubic-quintic and saturating nonlinearities are considered.
Cavity solitons are found in vertical-cavity surface-emitting laser with cubic and cubic-quintic nonlinearity by using variational method. The analytical cavity soliton solutions are validated by numerical split-step Fourier method. Spontaneous fission and subsequent generation of cavity soliton molecules, fusion and annihilation of cavity solitons are observed in the cavity with saturating absorber and frequency-selective feedback. The parametric space for generation of fronts, ∩-shaped and flat-top soliton solutions are identified. An alternate approach to generate cavity soliton is formulated by using standing wave method. This approach is shown capable for generation of a large variety of cavity solitons of different profile, ellipticity and power.
A comprehensive stability analysis is done for different cavity soliton systems. Trivial and non-trivial homogeneous steady states of cavity soliton are obtained. Stable, Hopf instable and unstable regions of cavity solitons are marked. Using Lyapunov exponents method in conjugation with Hurwitz's criteria the stability regions are identified for both one and two dimensional cavity solitons. The skill of stability analysis is successfully extended to beyond optics. Stable zones for mechanical and biological systems are identified.
The dynamics of cavity soliton is studied extensively to identify the effect of system parameters, such as, feedback strength, saturation, resonant frequency and amplitude on the dynamics as well as to explore novel phenomena. An intriguing all-optical ‘push-broom’ effect is demonstrated. The control on ‘push-broom’ effect by tuning system parameters is shown.
The generated cavity soliton has potential application in all-optical selectively erasable memory and data processing. The wide stability regions identified in this thesis may be of significant benefit to the experimental observation of cavity soliton. The push broom may lead to a novel soliton force microscopy
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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