1,721,304 research outputs found
Evolution of concepts and models for quantifying resiliency and flexibility of chemical processes
No full textThis paper provides a historical perspective and an overview of the pioneering work that Manfred Morari developed in the area of resiliency for chemical processes. Motivated by unique counter-intuitive examples, we present a review of the early mathematical formulations and solution methods developed by Grossmann and co-workers for quantifying Static Resiliency (Flexibility). We also give a brief overview of some of the seminal ideas by Manfred Morari and co-workers in the area of Dynamic Resiliency. Finally, we provide a review of some of the recent developments that have taken place since that early work.</p
Design and optimization of switched-mode circuits for inductive links
Full text linkWireless power transfer (WPT) via magnetic induction is an emerging technology that
is a result of the significant advancements in power electronics. Mobiles phones can
now be charged wirelessly by placing them on a charging surface. Electric vehicles can
charge their batteries while being parked over a certain charging spot. The possible
applications of this technology are vast and the potential it has to revolutionise and
change the way that we use today’s application is huge.
Wireless power transfer via magnetic induction, also referred to as inductive power
transfer (IPT), does not necessarily aim to replace the cable. It is intended to coexist
and operate in conjunction with the cable. Although significant progress has been
achieved, it is still far from reaching this aim since many obstacles and design challenges
still need to be addressed. Low power efficiencies and limited transfer range
are the two main issues for IPT. A tradeoff is usually associated with these two issues.
Higher efficiencies are only achieved at very short transmission distances, whereas
transferring large amounts of power at large distances is possible but at reduced efficiencies.
This thesis addressed the limitations and design challenges in IPT systems such as
low efficiency and short transmission range, in addition to poor power regulation and
coil displacement and misalignment sensitivity. Novel circuit topologies and design
solutions have developed for DC/AC inverters and DC/AC rectifiers that will allow
for increased performance, higher efficiencies and reduced sensitivity to coil misalignments
and displacements.
This thesis contributes in four key areas towards IPT. Firstly, a detailed mathematical
analysis has been performed on the electric circuit model of inductively coupled coils.
This allows for better understanding on how power is distributed amongst the circuit’s
elements. Equivalent circuit representations were presented to simplify the design
process of IPT systems. Secondly, a review of the different classes and configurations
of DC/AC inverters that can be used as primary coil drivers in IPT systems were
presented. Class E DC/AC inverters were mathematically analysed in great detail and
their performance as primary coil drivers in IPT systems was investigated. Thirdly,
novel electronic tuning methods were presented to allow Class E primary coil drivers
to operate at optimum switching conditions regardless of the distance between the
coils of an IPT system and the value of the load. The saturable reactor was used as the
electronic tunable element. Lastly, Class D and Class E AC/DC rectifiers have been
used for the first time in IPT systems. Detailed mathematical analysis and extensive
experimental results show their superior performance over the conventional half-wave
and full-wave AC/DC rectifiers
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
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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