1,721,728 research outputs found
Portfolio selection: efficient diversification of investment in gold during financial crisis
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A comparison of discriminant analysis and financial ratios in predicting financial distress
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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
ban dao ti zhong de ben zheng zhang cheng fan tie ci zuo yong
No full textM.Phil.Despite the various magnetic orders mediated by superexchange mechanism, the existence of a long range antiferromagnetic (AFM) coupling is unknown. In this thesis, we investigate the carrier free long range AFM coupling in four chalcopyrite systems CuInTe₂, CuGaTe₂, AgInTe₂ and AgGaTe₂. Based on DFT calculations, we discovered an intrinsic long range AFM coupling in V doped case. The AFM coupling is mainly due to the p - d coupling and electron redistribution along the interacting chains. The relatively small energy difference between p and d orbitals and the small energy difference between d orbitals of the dopants and that of stepping stone sites can enhance the stability of this AFM configuration. A multi-bands Hubbard model was proposed to provide fundamental understanding to the long range AFM coupling in chalcopyrite diluted magnetic semiconductors(DMS).儘管已知有多種基於超交換原理的磁序，關於長程的反鐵磁作用仍所知甚少。在本論文中我們將考察四個黃酮礦類體系中的無載流子長程反鐵磁作用。基於密度泛函理論，我們發現了釩摻雜條件下的無載流子長程反鐵磁作用。這種作用主要來源於p 和d 軌道的作用以及在此原子鏈上的電子再分佈。p 與d 軌道間以及雜質原子與中間"墊腳石"原子間相對較小的能量差可以幫助穩定反鐵磁構型。我們推導了一個多軌道Hubbard模型來加深對黃銅礦類磁半導體中的長程反鐵磁作用的理解。Gong, Weiyi = 半導體中的本征長程反鐵磁作用 / 龔唯奕.Thesis M.Phil. Chinese University of Hong Kong 2019.Includes bibliographical references (leaves 43-46).Abstracts also in Chinese.Title from PDF title page (viewed on 23, November, 2020).Gong, Weiyi = Ban dao ti zhong de ben zheng zhang cheng fan tie ci zuo yong / Gong Weiyi
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
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