1,721,008 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
Hydrogen peroxide concentration by distillation of a ternary liquid solution in microfluidics
No full textConsulta en la Biblioteca ETSI Industriales (Riunet)[EN] During the decade of 1960, the microtechnology started to be developed,
especially in the field of electronics. In fact, researchers found that microelectronics
reduce costs while increase reliability, functionality and efficiency. After that success,
microtechnology spread among several fields, as micromechanics or microfluidics.
Microfluidics field started to be important in the decade of 1980 with the
development of inkjet cartridges. But it was during the decade of 1990 where lab-on-achip
devices began to gain importance. At the beginning, microfluidics were used for
chemical and biological analysis [1]. Considering the success of this techniques,
researchers started to implement non-analytical processes using the lab-on-a-chip
technology. Since then, the microfluidic field has been growing very fast.
Microfluidics is a growing field which studies the behaviour of small volumes of
fluids constrained to a small scale. Microfluidics have countless applications in many
different fields as biology, chemistry, physics or any engineering speciality.
Lab-on-a-chip are microfluidic devices that integrate, in a single chip, several
types of laboratory processes, as reactors or separation processes. Microfluidic approach
has several advantages as efficient mass transfer and energy transfer, and safer operation
(small volumes are used) [2]. In addition, the development of the soft-lithography and the
use of polydimethylsiloxane has improved the simplicity, versatility and velocity of
microfabrication, and at the same time, has reduced considerably the fabrication costs [3].Serrano Latorre, H. (2015). Hydrogen peroxide concentration by distillation of a ternary liquid solution in microfluidics. https://riunet.upv.es/handle/10251/57759.Archivo delegad
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
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
Simulation of self-propelled droplet jumping on superhydrophobic surfaces
No full textNanostructured coatings offer the potential to create substrates with specific wetting properties. On these low-adhesion surfaces, coalescing droplets can spontaneously jump off, known as coalescence-induced droplet jumping. The fluid dynamics of coalescing droplets on superhydrophobic surfaces is governed by a subtle balance of surface forces, kinetic energy and viscous dissipation. This phenomenon is observed on a variety of synthetic and natural superhydrophobic surfaces, and gives rise to a range of applications. In condensers, self-propelled droplet jumping hinders the formation of an insulating condensate layer, which may significantly improve heat transfer. Under freezing conditions, it hinders the formation of an ice layer if droplets jump off the superhydrophobic substrate before solidifying. From an application point of view, it is important to predict condensation rates, removal rates and heat transfer on superhydrophobic surfaces on the macroscopic scale by an appropriate wall model. Through three dimensional simulations, this thesis studies the fluid dynamics of droplet jumping. Parametric studies show the influence of droplet mismatch, viscosity, gravity and contact angle on jumping velocities, where liftoff regimes are defined on the basis of Ohnesorge number, contact angle, Bond number and droplet size ratio. Results show that droplet jumping is a very inefficient process, as only a small fraction of the released surface energy leads to useful translatory kinetic energy. Moreover, droplet jumping is impaired with rising Ohnesorge and Bond numbers. Additionally, surfaces exhibiting higher contact angles also impair droplet detachment
Dynamics of falling films under the influence of a destabilizing body force
No full textA cascade of primary and secondary fluid dynamical instabilities leads to complex patterns of waves on the surface of falling liquid films. In falling films under the influence of a destabilizing body force, the film surface topology potentially evolves towards a distinct spanwise structuring into rivulets, which might be accompanied by fluid detachment from the substrate (dripping) depending on the specific properties of the film flow. The presence of a destabilizing body force, in this framework, encompasses all configurations in which fluid is accelerated normal to a bounding wall with the acceleration vector pointing from the fluid to the surrounding atmosphere. This thesis provides experimental as well as numerical data regarding the linear and non-linear evolution of falling films under the influence of a destabilizing body force with specific focus on the interplay of primary and secondary instabilities and long term structuring of the film surface. First, a software implementation of state of the art weighted residual boundary layer models for falling films is introduced. The presented implementation allows to rapidly compute three-dimensional wave patterns in falling films due to the use of spectral methods and GPU-accelerated computing. Subsequently, a comprehensive experimental study is presented in which the evolution of a falling film on the outside of a rotating cylinder is analyzed under variation of imposed flow rates and rotation frequency. Correlations are provided both for the wavelength as well as the inception length of developing rivulet structures. Finally, a numerical analysis of flow evolution, interaction of primary and secondary instabilities of the film surface and spanwise structuring before the dripping regime is performed for the case of a film on the underside of an inclined wall. In this context, simulations of the long term evolution of the film flow in a large domain are enabled through the application of the introduced software implementation of relevant falling film models. In the end, through the combination of experimental and numerical analysis, a comprehensive overview of the evolution of falling films under the influence of a destabilizing body force deep into the non-linear regime is provided. Adding to this, dependencies of characteristics of developing flow structures on fluid properties and further system parameters are given
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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