308,333 research outputs found
Going Beyond Counting First Authors in Author Co-citation Analysis
No full textThe 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
Dispelling the Myths Behind First-author Citation Counts
No full textWe 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
Rate of growth in discomfort with increase in vibration magnitude for low frequency roll oscillation
No full textHiguera Rubio, José y López Alcalde, Celia (eds.) (2015). Ars artium sive ars magna: The Roots of Llull’s Artistic Project (Ramon Llull’s 700th Anniversary)Ars artium sive ars magna
No full textHiguera Rubio, José y López Alcalde, Celia (eds.) (2015)Ars artium sive ars magna: The Roots of Llull’s Artistic Project (Ramon Llull’s 700th Anniversary)Oporto: Universidade do Porto = Mediaevalia: Textos e Estudos, 34, 210 p.ISSN 0872-0991Higuera Rubio, José y López Alcalde, Celia (eds.) (2015)Ars artium sive ars magna: The Roots of Llull’s Artistic Project (Ramon Llull’s 700th Anniversary)Oporto: Universidade do Porto = Mediaevalia: Textos e Estudos, 34, 210 p.ISSN 0872-0991Higuera Rubio, José y López Alcalde, Celia (eds.) (2015)Ars artium sive ars magna: The Roots of Llull’s Artistic Project (Ramon Llull’s 700th Anniversary)Oporto: Universidade do Porto = Mediaevalia: Textos e Estudos, 34, 210 p.ISSN 0872-0991Higuera Rubio, José y López Alcalde, Celia (eds.) (2015)Ars artium sive ars magna: The Roots of Llull’s Artistic Project (Ramon Llull’s 700th Anniversary)Oporto: Universidade do Porto = Mediaevalia: Textos e Estudos, 34, 210 p.ISSN 0872-099
The discomfort from exposure to low frequency rotational and translational vibration
No full textThe discomfort arising from exposure to low frequency oscillation is a matter of some interest in many forms of transport. However there is a dearth of knowledge about the discomfort which arises from exposure to vibration at low frequencies. This thesis investigates the effects of frequency, magnitude and direction arising from the exposure of seated passengers to roll, pitch, fore-and-aft and lateral oscillation at frequencies between 0.2 and 1.6 Hz. The objectives of this research were to investigate whether: • the discomfort arising from low frequency rotational and translational oscillation could be satisfactorily predicted based on knowledge of the acceleration in the plane of the seat; • the presence of a backrest would exacerbate discomfort during both rotational and translational oscillation; • the adoption of different postures during vibration would affect the reported discomfort. Achieving these objectives required determination of the frequency-dependence and magnitude dependence of discomfort arising from exposure to rotational and translational oscillation at frequencies less than 1.6 Hz. The investigations used the psychophysical method of magnitude estimation to determine the rate of growth of discomfort with increasing vibration magnitude, and contours of equivalent discomfort. Four studies within-axes contributed new information about the effect of vibration frequency on the discomfort arising from exposure to rotational and translational oscillation. A series of smaller studies determined the relationship between the discomfort arising within different axes, and a study investigated the effect of posture. Each study employed 12 subjects. At frequencies greater than 0.4 Hz, exposure to motion in the rotational axes caused greater discomfort than the equivalent motion in the translational axes. At lower frequencies, the acceleration in the plane of the seat was a good predictor of the discomfort experienced irrespective of whether oscillation was in the rotational or translational axes, except when the discomfort arising from fore-and-aft and pitch oscillation on a seat with no backrest was compared. It was found that the presence of a backrest exacerbated discomfort during rotational oscillation at frequencies greater than 0.4 Hz but reduced discomfort during fore-and-aft oscillation. The presence of a backrest increased the incidence of discomfort arising at the head neck interface. The ability of subjects to voluntarily control their posture was found to be low, except at the lowest frequencies. The sensitivity of subjects to angular displacement increased at approximately 6 dB per octave at frequencies greater than 0.4 Hz, whereas during translational acceleration on a flat rigid seat the rate of increase in sensitivity was lower at approximately 3 dB per octave. When subjects were seated on a rigid seat with backrest and exposed to translation acceleration the discomfort arising from motion was approximately independent of frequency over the range 0.2 to 1.6 Hz. The observed effect of vibration magnitude on the frequency dependence was small, but variations in the rate of growth of discomfort with frequency indicate this magnitude-dependence would be in settings where a greater range of accelerations was present. important Existing standardised methods of prediction (e.g. BS 6841) were compared to the results with minimal modification (linear extension of the asymptotic frequency weightings). Where discomfort is dominated by oscillation in a single axis at a single input (e.g. fore-and-aft oscillation with no backrest) the prediction was considered sufficient for many practical purposes. However, where the presence of a backrest influenced discomfort the quality of prediction deteriorated markedly and the standardised method cannot be recommended.</p
Discomfort arising from exposure to fore-and-aft and lateral vibration at frequencies between 0.2 and 1.6Hz
No full textAuthor, publisher and bookseller : a tripartite synergy in Nigerian book industry
No full textThis work is about the roles of Author, Publisher and Bookseller in Book development in
Nigeria. The paper started by delving into the history of Book Publishing in Nigeria after
which it proceeded by defining who an author, a publisher, and a bookseller is and
expatiated on the indispensable roles of these key actors in Nigerian Book Industry and in
the emerging Information Society. Furthermore, the various constraints to book
development were identified while the paper advised on how the Book Industry can be
further promoted in Nigeria. However, the paper concluded and made recommendations
on how the Book sector can help in enhancing scholarship in the country
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