S U M M A R Y Coda wave interferometry (CWI) utilizes multiply scattered waves to diagnose small changes in a medium by using the scattering medium as an interferometer. Since the medium is usually stationary over the duration of a seismic experiment, different (non-overlapping) time windows in the coda allow for independent estimates of the medium perturbation. If the seismograms are contamina...

This paper focuses on the perception and production of the English alveolar stops (/t/ and /d/) in syllable coda by Brazilian learners of English. In the production test, the participants read a list of English sentences containing alveolar stops in word-final position. The preceding and following phonological contexts were controlled, so that the effect of context on the production of the alve...

Ultrasonic measurements are used in civil engineering for structural health monitoring of concrete infrastructures. The late portion the ultrasonic wavefield, coda, is sensitive to small changes elastic moduli material. Coda Wave Interferometry (CWI) correlates these coda with wavefield recorded intact, or unperturbed, specimen reveal amount velocity change that occurred. CWI has potential dete...

This paper reports a numerical study of the sensitivity and applicability Nonlinear Coda Wave Interferometry (NCWI) method in heterogeneous material with localized microcracked zone. We model influence strong pump wave on zone as small average increase length each crack. Further probing this multiply scattered ultrasonic induces changes to coda-type signal, which are quantified coda interferome...

We close by describing two rather unusual applications of complex variables. The details are beyond the scope of this book, but the ideas involved definitely deserve mention. The first area of application is fluid dynamics. It was observed already in the nineteenth century that the equations describing the incompressibility and irrotationality of fluids are just the Cauchy-Riemann equations for...

Abstract Rhetorical structure is helpful in improving how the writers maintain cohesion in their writings. This study examines how the Iraqi writers maintain cohesion in the text by analyzing the various rhetorical moves in Azzaman, an online Iraqi newspaper. To this purpose, twelve opinion articles from Azzaman Iraqi newspaper, published from January 2013 to June 2013 were analyzed. The findin...

Abstract Systemic risk is a complex and multifaceted phenomenon that needs to be addressed from different perspectives. In this work we propose Compositional Data (CoDa) approach analyze the distribution of relative contributions systemic associated with major European countries during period 2008–2021. We represent measures corresponding those as percentage shares, or parts, compositional data...