1,720,962 research outputs found
Multiphysics Simulation of a Superconducting Neutron Detector
No full textThe detection of neutrons is crucial for both the operation of nuclear devices and the development of advanced imaging techniques. Recently, a hybrid superconducting niobium-boron sensor on a Si/SiO2 substrate has been developed, aiming for high pulse shape discrimination and controllability of the relaxation time. This device detects thermal neutrons by leveraging the 10B(n,α)7Li reaction in the B layer and the interaction of the charged products with the Nb strip. To critically assess the operation of the Nb-B thermal neutron detector, a multiphysicsmodeling approach is presented here. The software COMSOL Multiphysics is used to provide thermal and electrical responses of this device during the transition-to-normal state and its recovery phase. The study takes into account the impact of the thermal irradiation of the cryostat lid and the joule heating on the operating conditions of the Nb strip. Moreover, a pulsed heat load is introduced in the model to simulate the energy released by either the α or the Li reaction products in the current-biased Nb strip. The SRIM software is used to obtain the deposited power density profiles and theirmean volume of interaction within the sample. For simplicity, the reaction is assumed to take place at the half-thickness of the B layer and the particles propagate perpendicularly to the sample surface. Finally, an iterative procedure was applied to find themost favorable conditions to employ the device in a self-recovering mode by varying both the bias current and the cold finger temperature. This study presents a comprehensive understanding of the working mechanism of the Nb-B thermal neutron detector and proposes a computational approach to find the optimal working point of superconducting neutron detectors
Two new species of the genus Islamia Radoman, 1973 from Italian islands (Prosobranchia, Hydrobiidae)
No full textTwo new Italian species of the genus Islamia (Prosobranchia: Hydrobiidae), one living in eastern Sicily (I. cianensis), and one on Elba Island (Tuscan Archipelago, Italy) (I. gaiteri) are described. The two species are distinguished on the basis of shell and anatomical characters, mainly those of the male genitalia. I. cianesis n. sp. is characterized by a valvatoid shell and a penial lobe with internal band of glandular tissue not distinct in its lower portion from the penis body but bulging apically as a small knob. I. gaiteri n. sp. is characterized by a planispiral shell and a small lateral penial lobe without internal glandular tissue. © 1995 The Malacological Society of London
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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