This work will explore the discontinuous Galerkin finite element method (DG-FEM) for solving acoustic wave equations in heterogeneous material. High order convergence of DG-FEM will be verified by examples. The numerical error using DG-FEM has the same components as using finite-difference method: grid dispersion and misalignment between numerical grids and material interfaces. Both error compo...

The optical dispersive prism is a well-studied element, which allows separating white light into its constituent spectral colors, and stands in nature as water droplets. In analogy to this definition, the acoustic dispersive prism should be an acoustic device with capability of splitting a broadband acoustic wave into its constituent Fourier components. However, due to the acoustical nature of ...

In recent years, underwater acoustic (UWA) communications have received much attention as their applications have begun to shift from military toward commercial. Digital communications through UWA channels differ substantially from those in other media, such as radio channels, due to severe signal degradations caused by multipath propagation and high temporal and spatial variability of the chan...

An experiment has been performed to study the behavior of dust acoustic waves driven at high frequencies f 100 Hz , extending the range of previous work. In this study, two previously unreported phenomena are observed—interference effects between naturally excited dust acoustic waves and driven dust acoustic waves, and the observation of finite dust temperature effects on the dispersion relatio...

he producers include such individuals as composers and perormers for whom the main product either is creation of a new usical idea by the composer or re-creation of another’s novel dea by the performer—a subclassification that becomes impreise when the performance of music, itself, has a substantial reative component such as jazz. Furthermore, the expressive rges of composers have led to elabor...

The study investigated the effect of observational goals (i.e., impression formation and memory) on the process of observing ongoing behavior of others. Specifically, the amount of behavior extraction was studied. Forty-nine subjects were randomly assigned to impression and memory groups, and asked to watch a ten-minute video clip featuring a male actor in daily activities. The subjects in the ...

This contribution reports the results of the SHREC 2008 track on Stability on Watertight Models. This track saw six registrations of which only three participants effectively sent the results of their runs.

Four experiments investigated whether and how interpolated faces cause impairment to memories for related target faces. Participants viewed target faces and then saw a presentation of interpolated faces that were related to some of the targets. Modified tests, which offered target and novel faces as recognition alternatives, detected impairment effects after short retention intervals but not af...

AN OPTIC FIBER SENSOR FOR PARTIAL DISCHARGE ACOUSTIC DETECTION by Xiaodong Wang Partial discharge (PD) is a very common problem in operating power transformers and is one of the factors that could lead to failure of power transformers, leading to power outage and expensive repairs. The acoustic wave induced by PD can be measured and used for monitoring, diagnosing, and locating potential failur...