1,720,987 research outputs found
Geometrically induced DOS effect on electronic transport properties of Si nanowires
Full text linkSemiconducting nanowires (NW) have recently been extensively studied and developed for applications in nanoelectronics, optoelectronics, solar cells and sensors using carriers confinement. The Si and Ge NWs, in particular, can be promising candidates for one-dimensional superconductor-semiconductor hybrid systems3,4. However, their electronic transport properties are strongly dependent on their surface and core structure. Hence, a detailed study on their possible effects on these properties are necessary prior to utilization of such hybrid systems. Here, we have studied electronic transport properties as a function of the temperature of Si NWs with two distinct structures. One with embedded Si quantum dots and the other with a percolative crystalline path. We show that the predesigned structure of the wires results in a prominent single distinct conduction mechanism such as tunneling in the former case and variable range hopping in the latter case5. We demonstrate that measured transport properties are the result of the geometry of the systems, with a large internal surface having a significantly high density of states. These results improve the understanding of the basis of the different electronic transport mechanisms in silicon nanowires and can lead to advanced hybrid systems design with a high controllability and precision
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
Performance Optimization of a Three-Dimensional NanoSQUID Based on Niobium Tunnel Nanojunctions
No full textWe report results about an optimized three-dimensional nanoSQUID based
on niobium tunnel nanojunctions having the loop suspended to reduce the
parasitic capacitance. The SQUID loop has a size of 400 x 600 nm(2)
while the dimension of the square tunnel nanojunctions is 150 x 150
nm(2) with a density of the critical current of about 35 x 103 A/cm(2).
The nanodevice has been characterized at liquid helium temperature; it
has shown nonhysteretic current-voltage characteristics and smooth
voltage-magnetic flux characteristics resulting in a very stable
operation in a wide range of bias points. The spectral density of the
magnetic flux noise in the white region, measured with a two-stage noise
measurement setup, was as low as 300n Phi(0)/Hz(1/2) corresponding to a
spin sensitivity of few Bohr magnetons for bandwidth unit
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
Real-time and reversible light-actuated microfluidic channel squeezing in dye-doped PDMS
No full textThe azobenzene chromophore is used as a functional dye for the development of smart microfluidic devices. A single layer microfluidic channel is produced, exploiting the potential of a dye doped PDMS formulation. The key advantage of this approach is the possibility to control the fluid flow by means of a simple light stimulus. Furthermore, the deformation can be controlled in time, space and intensity, giving rise to several degrees of freedom in the actuation of the channel squeezing. A future perspective will be the implementation of the microfluidic platform with structured light, to have the possibility to control the flow in a parallel and reversible manner at several points, modifying the pattern in real time
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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