1,721,597 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
National scientific report on the TABULA activities in Italy
Get PDFThe Italian contribution to the TABULA research project is decribed. Ii was addressed to: - the development of the harmonised structure for the Italian typology and the supply of input data on buildings, constructions and systems (heating and DHW), which constitute the main data for the webtool; - the application of the typology concept for the assessment of the energy performance of residential buildings and for the evaluation of the impact of energy conservation measures, through the calculation of the energy performance of the building-types; - the use of the typology concept to create a model for the estimation of the national energy balance of the residential building stock by the support of national statistical dat
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
An Experimental Investigation on Propagation of Weak Shock Waves in a Random Medium
Get PDFNOTE: Text or symbols not renderable in plain ASCII are indicated by [...]. Abstract is included in .pdf document.
An apparatus has been constructed for generating a 25 cm cube of randomly inhomogeneous gas in the GALCIT 17-inch diameter shock tube. It consists of a two-dimensional 7 x 8 array of fine jets alternately of helium and freon-12 behind coarse grids located on opposite sides of a box. The two other side walls of the box are fitted with optical windows for diagnostics. The up-stream and downstream faces of the box are movable and can be opened rapidly just before shock arrival. This process is automated, and the arrival time of the shock wave relative to the decay of the turbulent density field can be varied. The gas mixture is made neutrally buoyant so that the mean interface between the scattering region and the uniform air in the shock tube is parallel to the plane of the incoming wave. Furthermore, the mean acoustic impedance of the mixture is matched to that of the quiescent air in the shock tube to minimize the effect of the air-gas mixture interface on the shock wave.
In this experiment shock waves of strengths varying from [...] = 1.007 to 1.1 scatter from random variations of acoustical impedance and index of refraction (defined as the ratio of the sound speed in air to the local, variable, sound speed in the scattering medium) which occur during the turbulent mixing of the two different gases. The scale and amplitude of the fluctuations before interaction with the shock wave are obtained from optical and point density measurements; the method of Uberoi and Kovasznay (Ref. 10) has been used to obtain length scales of the flow from shadowgraph and schlieren pictures, and the Brown-Rebollo (Ref. 11) density probe is used to measure local mean and rms density fluctuations, and space- and cross-correlation functions.
To study the interaction of the shock with the turbulence, spark shadowgraph and schlieren pictures have been taken and pressure measurements have been made. Arrays of pressure transducers located in a false endwall downstream of the scattering volume record the shock front topology and the spatial variation of shock amplitude.
The pressure measurements indicate a substantial modification of the unperturbed shock profile. Data are presented which indicate the effect of the Mach number on the scattering process.
Optical measurements show that length scales in the fluid, which is processed by all but the weakest shocks, have changed due to the interaction process
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
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