1,720,973 research outputs found
Nanofabrication for Molecular Scale Devices
Full text linkThe predicted 22-nm barrier which is seemingly going to put a final stop to Moore’s law is essentially related to the resolution limit of lithography. Consequently, finding
suitable methods for fabricating and patterning nanodevices is the true challenge of
tomorrow’s electronics. However, the pure matter of moulding devices and interconnections
is interwoven with research on new materials, as well as architectural and computational
paradigms. In fact, while the performance of any fabrication process is obviously related to
the characteristic of the materials used, a particular fabrication technique can put constraints
on the definable geometries and interconnection patterns, thus somehow biasing the upper
levels of the computing machine. Further, novel technologies will have to account for heat
dissipation, a particularly tricky problem at the nanoscale, which could in fact prevent the
most performing nanodevice from being practically employed in complex networks. Finally,
production costs – exponentially growing in the present Moore rush – will be a key factor in
evaluating the feasibility of tomorrow technologies.
The possible approaches to nanofabrication are commonly classified into top-down and
bottom-up. The former involves carving small features into a suitable bulk material; in the
latter, small objects assemble to form more complex and articulated structures. While the
present technology of silicon has a chiefly top-down approach, bottom-up approaches are
typical of the nanoscale world, being directly inspired by nature where molecules are
assembled into supramolecular structures, up to tissues and organs. As top-down
approaches are resolution-limited, boosting bottom-up approaches seems to be a good
strategy to future nanoelectronics; however, it is highly unlikely that no patterning will be
required at all, since even with molecular-scale technologies there is the need of electrically
contacting the single elements and this most often happens through patterned metal
contacts, although all-molecular devices were also proposed. Here, we will give some
insight into both top-down and bottom-up without the intention to be exhaustive, because
of space limitations
Nano-electronics and spintronics with nanoparticles
No full textWe review the current research on nanodevices with nanoparticles which present unique challenges in both the realization of well-controlled interfaces at the nanoscale and the ability to adequately characterize their electrical properties. In particular, we discuss the fabrication and electrical characterization of such nanodevices with special attention to devices based on metal and magnetic nanoparticles
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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