1,720,953 research outputs found
Surface plasmon resonances in deep metallic gratings at microwave frequencies
No full textThe manipulation of the electromagnetic response of a metallic structure through the excitation of surface plasmon polaritons has been an area of increasing study in recent years. This thesis presents the experimental observation of extraordinarily enhanced, highly frequency selective transmission of microwave radiation through very thick, almost perfectly conducting aluminium gratings with air cavities a small fraction of the incident wavelength. This has been attributed to the electric fields of the surface plasmon polaritons excited on the grating's cavity walls coupling across the air gaps, setting up standing waves along the depths of the cavities for a series of grating depths. Theoretical modelling undertaken demonstrated significant levels of electric field enhancement on resonance, compared with the off-resonance case. Blazing such structures has the advantage of significantly reducing sample thickness, whilst at the same time exciting high-order modes within the cavities whose resonant wavelengths have a slow-moving dependence on the blaze angle. The result is a tuneable, extremely wavelength-selective filter. The phenomenon of self-coupled surface plasmon polaritons across the cavities of extremely deep, highly conducting diffraction gratings is determined to be responsible for the observation of sharp minima in the frequency-dependent reflectivity of such structures. Due to the lack of alternative channels of energy loss from the system in some cases, it is assumed that the microwave radiation is absorbed into the metal of the gratings, facilitated by electric field enhancement within the grating grooves. (author)Available from British Library Document Supply Centre- DSC:DXN055370 / BLDSC - British Library Document Supply CentreSIGLEGBUnited Kingdo
‘I didn’t fit the stereotype of autism’: A qualitative analysis of women’s experiences relating to diagnosis of an autism spectrum condition and mental health
Full text linkAutism spectrum conditions are generally perceived to affect males, with the majority of studies quoting the ratio of four males being diagnosed with autism for each female. The potential implications of this for women on the spectrum or seeking a diagnosis are wide-ranging, including healthcare professionals’ disbelief in autism in women leading to difficulties obtaining a diagnosis and misdiagnosis of other mental health conditions. In this study, a grounded theory methodology was applied to data from fifteen online blogs to explore the experiences of adult women on the autism spectrum of diagnosis of autism, and of mental health issues. The study yielded two grounded theory models: of diagnosis of autism and of mental health, which are linked through misdiagnosis of and comorbid mental health conditions. The findings suggest that there is a need for clinicians to be aware of the unique presentation of autism in women, and of the additional mental health issues which women with autism commonly experience. Additionally, targeted autism-specific interventions may be required, focussing on the core difficulties of autism as opposed to the resultant emotional and mental health difficulties
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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