1,720,978 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
Experimental Investigation of Natural Plant Extracts as A Green Corrosion Inhibitor in Steel
Full text linkNatural plant extracts show excellent performance in inhibiting steel corrosion. Steel has a relatively weak resistance to corrosion when in a corrosive environment. The use of natural plant extracts as green corrosion inhibitors is able to provide good performance with high inhibition efficiency. Experimental methods such as gravimetric analysis, potentiodynamic polarization, and electrochemical impedance spectroscopy are commonly used to investigate corrosion inhibition based on corrosion activity. A comparative literature review of this work is important for the development and utilization of green inhibitors. Experimental studies still do not clearly reveal the mechanism of adsorption and inhibition of molecular inhibitors at the atomic level. For this reason, future developments are very important to study theoretically at the atomic level of the main components of natural plant extracts as corrosion inhibitors, so that it is hoped that there will be a clear and systematic understanding of the mechanism of corrosion inhibition in steel.
 
Investigasi DFT pada Ekstrak Tanaman Cengkeh dan Tembakau sebagai Inhibitor Korosi Hijau
No full textIn the present work, corrosion inhibition of Syzygium aromaticum and Nicotiana tabacum extract was studied by DFT method. Frontier molecular orbitals (FMO) plots, quantum chemical descriptors such as highest occupied molecular orbital energy (EHOMO), lowest unoccupied molecular orbital energy (ELUMO), energy gap (ΔE), dipole moment (l) and partial charge analysis were calculated. The results obtained show that the eugenol as extract of Syzygium aromaticum and nicotine as extract of Nicotiana tabacum acts as an effective green corrosion inhibitor. In general, nicotine has a better potential as an green corrosion inhibitor than eugenol based on chemical reactivity. However, further studies are needed to gain insight into the mechanism of corrosion inhibition through the study of the adsorption of eugenol and nicotine molecules on metal surfaces.Dalam penelitian ini, penghambatan korosi ekstrak Syzygium aromaticum dan Nicotiana tabacum dipelajari dengan metode DFT. Plot orbital molekul perbatasan (FMO), deskriptor kimia kuantum seperti energi orbital molekul terisi tertinggi (EHOMO), energi orbital molekul kosong terendah (ELUMO), celah energi (ΔE), momen dipol (l) dan analisis muatan parsial dihitung. Hasil yang diperoleh menunjukkan bahwa eugenol sebagai ekstrak Syzygium aromaticum dan nikotin sebagai ekstrak Nicotiana tabacum berperan sebagai penghambat korosi hijau yang efektif. Secara umum, nikotin memiliki potensi yang lebih baik sebagai inhibitor korosi hijau daripada eugenol berdasarkan reaktivitas kimia. Namun, studi lebih lanjut diperlukan untuk mendapatkan wawasan tentang mekanisme penghambatan korosi melalui studi adsorpsi molekul eugenol dan nikotin pada permukaan logam
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
A First-Principle study of the O, O2, OH, and HO2 adsorption on the Fe (100) surface
Full text linkAbstract: The purpose of this study was to investigate the interaction between O, O2, OH, and HO2 species on the Fe(100) surface using the DFT method. The DFT calculation provides specific information of the electronic structure of a molecules in ground state. The results show that the O atom preferred to be adsorbed on the hollow site, the OH species was adsorbed on the bridge site, while the O2 molecule was dissociated into two O atoms where both were adsorbed on the hollow site. Furthermore, when the H atom is attached to one of the O atoms of the dissociated O2 molecule, the OH species is formed which is adsorbed at the bridge site, and another O atom which remains adsorbed at the hollow site. This study can provide preliminary information on the adsorption mechanism of O, O2, OH, and HO2 species in explaining the electrochemical corrosion mechanism in our next work.Abstrak: Penelitian ini bertujuan untuk mengetahui interaksi antara spesi O, O2, OH, dan HO2 pada permukaan Fe(100) menggunakan metode DFT. Perhitungan DFT memberikan informasi spesifik tentang struktur elektronik molekul dalam keadaan dasar. Hasil penelitian menunjukkan bahwa atom O lebih suka teradsorpsi pada situs berongga, spesi OH teradsorpsi pada situs jembatan, sedangkan molekul O2 terdisosiasi menjadi dua atom O dimana keduanya teradsorpsi pada situs berongga. Selanjutnya, ketika atom H terikat pada salah satu atom O dari molekul O2 terdisosiasi, terbentuk spesies OH yang teradsorpsi di situs jembatan, dan atom O lain yang tetap teradsorpsi di situs berongga. Penelitian ini dapat memberikan informasi awal tentang mekanisme adsorpsi spesi O, O2, OH, dan HO2 dalam menjelaskan mekanisme korosi elektrokimia pada penelitian kami selanjutnya
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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