1,721,012 research outputs found
Some New Characteristics on Cyclic Number 142857
Get PDF1/7の循環節142857に関して新しい7つの特徴を発見したので紹介した。以下にそのうちの主な5つの特徴を示す。1)142857に使用される6つの数字を任意に2つずつ組み合わせた数、あるいは、3つずつ組み合わせた数に関して、その3乗の和は9の倍数となる。2)巡回数と逆順数について、一の位から2桁ずつ区切り2乗の和を求め、さらに2桁ずつ区切り和を求めると71になる。3)巡回数とその逆順数の和の2乗を一の位から6桁ずつ区切りその和を求めると142857になる。4)142857の各桁の数字に6を加えた数、あるいは9を加えた数に関して「分解2乗差」操作を行うと0になる。5)142857を含むn/91(nは1〜90の整数)の循環節の逆順数はすべてn/91の循環節となる。同様に、n/91の巡回数もすべてn/91の循環節になる。departmental bulletin pape
O número 142857 e o número de ouro: curiosidades, propriedades matemáticas e propostas de atividades didáticas
Get PDFThis work presents curiosities, mathematical properties, applications beyond the purely mathematical field and some of the history of two numbers: the number 142857 and the golden number. In addition, some educational activities for the study of these numbers in mathematics classes are proposed. The number 142857 is called of cyclic because 142857x2 = 285714, 142857x3 = 428571, 142857x4 = 571428, 142857x5 = 714285 e 142857x6 = 857142 and the golden number is applied in botany, zoology, art, materials engineering and has many relationships with the Fibonacci sequence. Keywords: cyclic numbers, golden number, Fibonacci sequence, educational activities, mathematical curiosities.Neste trabalho são apresentadas curiosidades, propriedades matemáticas, aplicações além do campo puramente matemático e um pouco da história de dois números: o número 142857 e o Número de Ouro. Além disso, são propostas algumas atividades didáticas para o estudo desses números em aulas de Matemática. O número 142857 é chamado de cíclico porque 142857x2 = 285714, 142857x3 = 428571, 142857x4 = 571428, 142857x5 = 714285 e 142857x6 = 857142 e o Número de Ouro tem aplicações na Botânica, Zoologia, Artes, Engenharia de Materiais e tem muitas relações com a sequência de Fibonacci. Palavras-chaves: números cíclicos, Número de Ouro, sequência de Fibonacci, atividades didáticas, curiosidades matemáticas.CAPES - Coordenação de Aperfeiçoamento de Pessoal de Nível Superio
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
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
- …
