1,722,055 research outputs found
Statistical energy analysis of marine structures with periodic and near-periodic components
No full textPeriodic and near-periodic components, in the form of stiffened panels, are found in a wide range of marine structures. The repetitive topology of such structures results in the presence of pass-bands and stop-bands; bands in which energy can flow with little attenuation and high attenuation respectively. In addition, repeated identical stiffener joints result in the filtering of waves. Neither of these effects is modelled in the classical form of the Statistical Energy Analysis (SEA) method. The present work describes the development of a methodology in which the specific characteristics of one-dimensional stiffened panels may be incorporated into SEA.A technique is described for including a full description of a stiffened panel into the standard SEA formulation in the form of a dissipative coupling element. In conjunction with exact and approximate transmission models developed here for periodic and near-periodically stiffened structures, it is demonstrated that the method correctly models the physics of transmission through stiffened panels and provides a significantly improved model over that achievable with a classical SEA model.The results obtained from the computational models are validated against experiment and a series of experiments are described in which the effect of single-sided water loading on a panel is investigated. The predominant effect of the fluid on the panel under investigation is demonstrated to be a mass-loading of the panel, resulting in an increase in modal density and a frequency-shift to the pass-bands. As part of the investigation, an experimental validation of a previously derived expression for the point mobility of a fluid-loaded plate is presented.</p
Defence Logistics: Enabling and Sustaining Successful Military Operations
No full textThe principal purpose of this chapter is to examine aspects of defence logistics, principally operational logistics, in order to shed light on some of the realities that give it its particular character, or at least some of its character. One possible approach is to analyse the defence supply chain and support chain using an analytical framework built around established through life support and supply chain paradigms, concepts, and ideas, drawn from the commercial sector. Another approach is to examine some specific characteristics of defence supply chains and support chains, some of their attributes, and some of their practical realities, and whilst doing so refer to the established paradigms, concepts, and ideas for comparison, but only where it seems appropriate to do so, in the hope that they might to some extent act as reference points by which defence logistics can be better understood by somebody not directly involved in its planning and delivery. One aim of this chapter is to examine the freedoms which defence departments and defence logisticians have in shaping their business, and the factors, or ‘realities’, which constrain them.Unfunde
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
- …
