1,720,966 research outputs found
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
The environmental effect on the cooling rate of hot mix asphalt pavement
Full text linkHigh demand for new asphalt pavements often requires that paving be done in an unfavorable condition such as low air temperatures, high speed winds, and night construction that will influence the cooling rate thus affecting the Time Available for Compaction (TAC). Higher cooling rate will reduce the TAC. In local practice, the asphalt paving compaction control mechanisms quoted from the locally used specifications are normally based on the limits of the delivery and laying completion temperatures. There are no items to predict these control elements and to be specifically related to the local conditions. This study was carried out with objective to investigate the environmental effect on cooling rate, aiming to determine the appropriate Time Available for Compaction (TAC) using laboratory tests which include the study parameter; solar flux, base and ambient temperature (daytime and night paving) and wind velocity focusing at HMA ACW 14 of mix type for wearing course and ACB 28 of mix type for binder course. Samples were prepared in slab mold, compacted using manually operated steel roller. Temperature measurements were taken from slabs at middle and surface position. Temperature of mixing was based on JKR specification. A controlled sample was prepared for each mix type, tested in the laboratory without any wind velocity and solar flux effect. Based on the result obtained, it can be concluded that the cooling rate of HMA is significantly affected by the environmental factor thus influencing the TAC. The TAC tend to decrease by 15-50% during windy and night condition while increase up to 100% during daytime condition
Safe following distance predictive model incorporating vehicle heterogeneity on selected urban expressway / Wardati Hashim
Full text linkWith more demands due to the development progress, freight transport seems to grow rapidly around the world. The scenario lead to the high frequencies of heavy vehicle (HV) being on the road which provide a remarkable influence on the traffic flow and following behavior. This research focus on the safe distance following model with a function of headway. Most of the established models did not take into consideration of the heterogeneous condition of traffic but only determined from a car following another car. Furthermore, those models mainly did not include other important parameter such as relative speed, acceleration and deceleration rate. Therefore, the objective of the research is to propose another safety following distance model with a function of time headway that will address the shortcomings of the existing models. The research proposed the model through the analysis of empirical data which was collected using video recording method from a high point located on the bridge across three (3) expressway located in the vicinity of Klang Valley, Malaysia. Then the data was reduced using a specific software name TRAIS. Multiple linear regression of MINITAB 16 was used to estimate the model. This study separate into four different vehicles interaction namely as car-following-car (C-C), car-following- heavy vehicles (C-HV), heavy vehicle-following-car (HV-C) and heavy vehicle-following-heavy vehicle (HV-HV). The results indicate that drivers‘ behavior is significantly different for different vehicle being driven and/or followed. The results show that car has the shortest headway when following other car among other vehicle interaction while HV has the highest headway when following other HV. Results also indicate that the increase of speed will lead to the decrease of time headway. Furthermore, other variables which are relative speed and acceleration/ deceleration seem to have influence on the time headway, which by right improving the finding of other established model in determining the time headway for safe following distance. There is also no significant difference between the empirical and the predicted value, thus indicating that the developed model may contribute to predict the safe following distance in accordance to vehicle interaction. This finding however considered only the traffic parameters as influential factor, on a non-congested urban expressway. Study on the influence of geometric design and on other type of road of during congested time is recommended in the future
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
Dispelling the Myths Behind First-author Citation Counts
Full text linkWe 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
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