1,720,955 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
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
Power Management System for Offshore Crane
Get PDFThe main objective in this thesis is to control the power consumption of a lattice boom offshore crane in order to reduce frequency variations and prevent blackouts. After studying how the electrically powered offshore lattice boom cranes works and are put together, a dynamic model of the power consumption for a crane was developed. By using the moment balance for the different systems on the crane (hoisting, luffing and slewing) the torque needed to drive the system at a given speed is calculated. A model of a diesel generator was also implemented. This model was found in an technical article, and implemented mainly by using parameters for a 440kW diesel generator. Some of the parameters had to be found in other literature. These values are "typical values" for diesel generators, and may be the cause of that the modelled diesel generator has a relatively slow response.Two datasets were received from National Oilwell Varco Molde AS(NOV) which shows total load in kW and the corresponding RPM of the diesel generator from an actual crane. The load sequences from these datasets were extracted in order to have realistic load scenarios for simulations.The next step was to set up three different simulation scenarios in order to explore the advantages of feeding the measured load forward to the regulator of the RPM of the diesel generator. The first scenario was made by using the model of the crane with a sequence of different reference speeds for the speed controllers for the three systems on the crane. The two other scenarios are using the load sequences from the two datasets received from NOV. After running these three simulation scenarios both with and without the feed forward and studying how this influenced the RPM of the diesel generator, the conclusion was that it reduced the variations of the RPM. The small variations were almost completely removed, while large variations in the load still caused peaks in the RPM even though they were reduced.The large peaks still remained because of that the diesel generator has a limit to how fast it can increase its produced power. When the total load consumed by the crane has a large instant increase, the diesel generator does not manage to follow and in worst case, it blacks out.Therefore this had to be prevented by limiting the rate of change of the load, so that it does not increase faster than that the diesel generator manages to increase its produced power. In this project a MATLAB function is used to limit the requested load from the different speed controllers for the three systems on the crane. In addition to the rate of change, it also has to control that the total consumed load does not exceed the maximum load that the generator is able to produce. When sharing the power between the different systems, the hoisting system has a 100\% priority, while the luffing and the slewing system shares the remaining power available based on how many percent of their maximum power consumed they requests. The effect of this limitation is shown by running a simulation by using the first simulation scenario. The reason for choosing the load sequence that is generated by running the crane model is that the loads for the different systems are available separately, whereas in the datasets received from NOV only the combined total load is available. The conclusion is that the combination of the feed forward and the limitation of the requested load and the rate of change of the requested load, helps reduce the variations in the RPM of the diesel generator significantly. Thereby the variations in the frequency are reduced and an eventual power blackout is prevented
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
Power Management System for Offshore Crane
No full textThe main objective in this thesis is to control the power consumption of a lattice boom offshore crane in order to reduce frequency variations and prevent blackouts. After studying how the electrically powered offshore lattice boom cranes works and are put together, a dynamic model of the power consumption for a crane was developed. By using the moment balance for the different systems on the crane (hoisting, luffing and slewing) the torque needed to drive the system at a given speed is calculated. A model of a diesel generator was also implemented. This model was found in an technical article, and implemented mainly by using parameters for a 440kW diesel generator. Some of the parameters had to be found in other literature. These values are "typical values" for diesel generators, and may be the cause of that the modelled diesel generator has a relatively slow response.Two datasets were received from National Oilwell Varco Molde AS(NOV) which shows total load in kW and the corresponding RPM of the diesel generator from an actual crane. The load sequences from these datasets were extracted in order to have realistic load scenarios for simulations.The next step was to set up three different simulation scenarios in order to explore the advantages of feeding the measured load forward to the regulator of the RPM of the diesel generator. The first scenario was made by using the model of the crane with a sequence of different reference speeds for the speed controllers for the three systems on the crane. The two other scenarios are using the load sequences from the two datasets received from NOV. After running these three simulation scenarios both with and without the feed forward and studying how this influenced the RPM of the diesel generator, the conclusion was that it reduced the variations of the RPM. The small variations were almost completely removed, while large variations in the load still caused peaks in the RPM even though they were reduced.The large peaks still remained because of that the diesel generator has a limit to how fast it can increase its produced power. When the total load consumed by the crane has a large instant increase, the diesel generator does not manage to follow and in worst case, it blacks out.Therefore this had to be prevented by limiting the rate of change of the load, so that it does not increase faster than that the diesel generator manages to increase its produced power. In this project a MATLAB function is used to limit the requested load from the different speed controllers for the three systems on the crane. In addition to the rate of change, it also has to control that the total consumed load does not exceed the maximum load that the generator is able to produce. When sharing the power between the different systems, the hoisting system has a 100\% priority, while the luffing and the slewing system shares the remaining power available based on how many percent of their maximum power consumed they requests. The effect of this limitation is shown by running a simulation by using the first simulation scenario. The reason for choosing the load sequence that is generated by running the crane model is that the loads for the different systems are available separately, whereas in the datasets received from NOV only the combined total load is available. The conclusion is that the combination of the feed forward and the limitation of the requested load and the rate of change of the requested load, helps reduce the variations in the RPM of the diesel generator significantly. Thereby the variations in the frequency are reduced and an eventual power blackout is prevented
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
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