1,721,604 research outputs found
14. Wright (Matthew), Euripides' Escape-Tragedies. A Study of Helen, Andromeda and Iphigenia among the Taurians
No full textBlanchard Alain. 14. Wright (Matthew), Euripides' Escape-Tragedies. A Study of Helen, Andromeda and Iphigenia among the Taurians. In: Revue des Études Grecques, tome 119, Juillet-décembre 2006. pp. 798-800
14. Wright (Matthew), Euripides' Escape-Tragedies. A Study of Helen, Andromeda and Iphigenia among the Taurians
No full textBlanchard Alain. 14. Wright (Matthew), Euripides' Escape-Tragedies. A Study of Helen, Andromeda and Iphigenia among the Taurians. In: Revue des Études Grecques, tome 119, Juillet-décembre 2006. pp. 798-800
Scatter-plots for acoustics lessons
No full textMaterial-selection charts, in the form of grouped scatter plots of material properties of solids, are known to be useful in structural engineering, and as a conceptual tool for teaching. In this article similar plots for the properties of liquids and gases are introduced, and their application to the teaching of acoustics is discussed.Analogous charts for musical strings are presented, highlighting the analogy between the properties of wave-bearing fluids and those of wave-bearing strings. Data from one manufacturer show consistently higher tension for bowed strings than plucked strings, with the exception of the bowed erhu and the plucked mandolin, bothof which have intermediate tension. Questions that could be discussed in class or form the basis of student investigations are suggested throughout
Volterra series characterisations and identification of nonlinear bioacoustic systems
No full textThis thesis is concerned the development of useful engineering techniques for the characterisation and identification of nonlinear systems in terms of their Volterra Series representations. The Volterra series is presented and discussed in some detail. Various Techniques for deriving a system's Volterra kernels from a differential equation are discussed. An example of the extension of these procedures to distributed parameter systems is given in the form of the Burgers equation or nonlinear acoustic propagation. Mathematical criteria for the convergence of the series are presented and are compared with qualitaitve features of the system's behaviour which are shown to be necessary for convergence. In this way a number of criteria are developed in order to determine under what circumstance the Volterra series is suitable for the modelling of a particularly nonlinear system. Related functional series are discussed, in particular the Hermite functional series which is considered in a stochastic context. The properties of this series are used to allow an interpretation of a linear frequency response function estimator applied to a nonlinear system. A newer identification procedure is discussed which involves maximum length sequences. These are reviewed in such a way as to emphasise the important `multiply and shift' property which makes this procedure work. A number of new results are presented which enable the experimenter to efficiently generate and manipulate such sequences. The identification procedure is examined in detail together wiht strategies to enhance its efficiency and reliability and to reduce the phenomenon of overlapping kernel slices. The procedure is tested in simulated data in order to demonstrate its properties. The same procedure is then used on a number of real nonlinear systems. The first is a small nonlinear amplifier whose second and third Volterra kernels are obtained. The second is the nonlinear path between acoustic stimulation of the human ear and measured otoacoustic (or cochlea) emissions.</p
Single Combat
No full textCD recording of collaborative work with Matthew Wright derived from improvisations. The CD consist of 77 sonic splinters designed to be loud and fragmented and to be played using shuffle mode on CD/MP3 players or phones/tablets.
Roger Redgate - electric violin/FX pedal
Matthew Wright turtable/Lapto
Force feedback microelectromechanical microphones for high performance applications
No full textMicroelectromechanical System (MEMS) condenser microphones are widely used because of their low cost, small size, high sensitivity, and wide bandwidth. For certain specialist applications, however, they are still out-performed by the best conventional condenser microphones, which have greater bandwidth and dynamic range, but at higher cost and larger size. The sensitivity, and hence, signal-to-noise ratio of smaller MEMS microphones can be increased by using two perforated back-plates instead of one. The maximum amplitude is limited by membrane excursion, which leads to nonlinearity and, ultimately, failure. The use of force feedback holds the promise of avoiding these problems by holding the membrane at its equilibrium position while measuring the force required to do so. Previous attempts to accomplish this using a Sigma-Delta modulator have had only limited success in terms of signal-to-noise ratio, bandwidth and stability. Instead we propose to use an Electro-Mechanical Phase Locked Loop (EMPLL) to overcome these limitations. We will present lumped-parameter and Finite Element models of the performance of such a microphone, and discuss the challenges associated with its fabrication. [This work was supported by Roke Manor Research Limited.
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
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