1,723,342 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
PRELIMINARY RESULTS OF OBSERVATIONS OF THE SOURCES OF SLOWLY VARYING COMPONENT WITH TWO INTERFEROMETERS AT 9400 AND 4000 Mc/s
Get PDF1960-03-25An 8-element interferometer for use at 9400 Mc/s has been constructed and regular observations have been made from May, 1959. In this paper comparisons of the results of observations at 9400 Mc/s and those at 4000 Mc/s for 4 selected sources of S component of solar radio emission are described. The results of observations show that the heights of the sources at 9400 Mc/s are between 3000 and 40000 km and, on the average, seem to be about 10^4km lower than those at 4000 Mc/s (11000-50000 km). The flux from the radio source at 3750 Mc/s is nearly equal to one at 9100 Mc/s or larger. Brightness temperature of the strong source is about 10^5K at 9400 Mc/s and about 0.7×10^6K at 3750 Mc/s. It seems that the brightness temperature of two sources specially near 4000 Mc/s is raised by the effect of the magnetic field of sunspots. % polarization of S component from the radio source at 9400 Mc/s is larger than one at 4000 Mc/s. There is a radio source which has an opposite sense of polarization between 9400 and 4000 Mc/s near C.M.departmental bulletin pape
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
Вивчення мутагенної активності ліпосахариду Pseudomonas Syringae Pv. Antrofaciens 9400 у Allium Cepa-тесті
Get PDFВивчено вплив ліпополісахариду (ЛПС) Pseudomonas syringae pv. atrofaciens 9400 на мітотичну
активність та спонтанні хромосомні аберації у клітинах апікальної меристеми корінців Allium
cepa. ЛПС у концентраціях 10,0; 5,0 та 2,5 мг/мл зменшував мітотичний індекс, що свідчить про
його токсичність у цих концентраціях. ЛПС P. syringae pv. atrofaciens 9400 характеризувався мутагенною
активністю і збільшував кількість фрагментів хромосом у клітинах апікальної меристеми
корінців A. cepa у концентраціях 5,0 та 2,5 мг/мл. Низькі концентрації ЛПС (1,0 та 0,1 мг/мл) не
впливали на кількість хромосомних аберацій у тест-організму
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
EQUIPMENT FOR THE OBSERVATION OF SOLAR RADIO EMISSION AT 9400, 3750, 2000 AND 1000 Mc/s
Get PDF1957-03-25Equipment for the observation of solar radio emission at 9400, 3750 and 1000 Mc/s are completed. A radiometer for use at 2000 Mc/s is now in construction. To facilitate intercomparison, all the paraboloids are made in similar figures. Each has a similar feed-antenna of a circular waveguide connected to a turnstile circuit for separating polarizations. Equipment for use at 1000 (also at 2000) Mc/s has a device to indicate directly the percentage polarization of outstanding occurrences. Static modulators are used for 9400 and 3750 Mc/s radiometers.departmental bulletin pape
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
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