1,720,984 research outputs found
The Mongolian Gerbil as a Model for the Analysis of Peripheral and Central Age-Dependent Hearing Loss
Full text linkNon
Hearing Loss
No full textAuthored by 17 international researchers and research teams, the book provides up-to-date insights on topics in five different research areas related to normal hearing and deafness. Techniques for assessment of hearing and the appropriateness of the Mongolian gerbil as a model for age-dependent hearing loss in humans are presented. Parental attitudes to childhood deafness and role of early intervention for better treatment of hearing loss are also discussed. Comprehensive details are provided on the role of different environmental insults including injuries in causing deafness. Additionally, many genes involved in hearing loss are reviewed and the genetics of recessively inherited moderate to severe and progressive deafness is covered for the first time. The book also details established and evolving therapies for treatment of deafness
Auditory brainstem response with cognitive interference in normal and autism spectrum disorder children - understanding the auditory sensory gating mechanism
No full textEarlier studies disputed the influence of higher-order function such as attention or cognitive inhibition on the auditory brainstem response (ABR) result. In short, the ABR result was considered similar with or without the subject paying attention. However, in the last few years, there has been growing evidence that the higher-order function may influence the ABR findings provided the sensory gating system of the brain is triggered by any cognitive interference activities. This chapter will explain the concept of auditory sensory gating, a method to measure auditory sensory gating, and at the end of the chapter, preliminary findings concerning the ABR with cognitive interference among ten normally developing children are presented. This chapter will also share a case study that compared auditory sensory gating capacity in normal and children with mild autism spectrum disorder (ASD)
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
Theoretical and experimental revelation of the structural, dielectric, optical and magnetic properties of Sr1−xNixFe8SnO15 (x = 0, 0.2, 0.4, and 0.6) V-type hexagonal ferrites
No full textA novel V-type hexaferrite with the substitution of strontium by divalent nickel, having the chemical formula Sr1−xNixFe8SnO15 (x = 0.0, 0.2, 0.4, and 0.6), is synthesized by employing a sol–gel auto combustion method. X-ray diffraction (XRD) patterns confirmed the hexagonal phase for all the samples; however, an extra peak due to SnO2 was observed. With the increase in the Ni2+ concentration, the values of lattice constants a (Å) and c (Å) and unit cell volume decreased slightly, and the crystallite size was calculated to vary in the range of 19 to 21 nm for all the samples. Transmission electron microscopy (TEM) analysis indicated that the average particle size lies in the range of 70–110 nm for all the samples. The samples have the maximum dielectric constant (ε′) and minimum electrical modulus (M′) at low frequency (<100 Hz); when the frequency is gradually increased, both the parameters stabilized and became constant, with real permittivity values from 61.4 to 37.4 between 1 kHz and 10 MHz, which are high values for hexaferrites. AC conductivity increased exponentially with the increase in frequency, while Ni content had little effect on these values. The polarization versus electric field (P–E) loops showed electrical polarizability but represented a lossy behavior that lessened with increasing Ni2+ content. The optical band gap energy values increased slightly with Ni2+ substitution over the unsubstituted sample. The saturation magnetization (Ms) increased with Ni substitution from 31.1 emu g−1 in the pure V ferrite to a maximum value of 43.6 emu g−1 for x = 0.4, and remanence magnetization (Mr) values were also significant. However, a drastic decrease in coercivity (Hc) was observed with Ni substitution, from a reasonably hard ferrite (Hc = 2218 Oe, 176.5 kA m−1) for x = 0.2 to very soft ferrites with x = 0.4 and 0.6 (Hc of around only 200 Oe, 16 kA m−1, a ten-fold decrease). The small grain size, reasonable Ms, and great variation in Hc with x between hard and soft ferrites while maintaining some Mr signify that these V-type hexaferrites could also be interesting materials for potential spintronic, magnetic memory, and microwave absorption applications
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
- …
