Learn More
A lithotrophic ammonia-oxidizing bacterium of the Nitrosomonas type was isolated from the lower River Elbe. Enrichment was attained from suspended particulate matter (SPM) of a water sample. At its natural environment, this species almost exclusively occurred attached to flocs, as demonstrated with the immunofluorescence technique. On the species level, the(More)
The aeroacoustic mechanisms in human voice production are complex coupled processes that are still not fully understood. In this article, a hybrid numerical approach to analyzing sound generation in human voice production is presented. First, the fluid flow problem is solved using a parallel finite-volume computational fluid dynamics (CFD) solver on a fine(More)
For understanding the phonatory process in human voice production, physical as well as numerical models have been suggested. Material properties within these models are crucial for achieving vocal fold dynamics being close to in vivo human laryngeal dynamics. Hence, different approaches have been suggested to gain insight into human laryngeal tissue,(More)
A measurement setup combined with a Finite Element (FE) simulation is presented to determine the elasticity modulus of soft materials as a function of frequency. The longterm goal of this work is to measure in vitro the elasticity modulus of human vocal folds over a frequency range that coincides with the range of human phonation. The results will assist(More)
An advanced Finite Element Method is presented which is being applied to simulate fluid flow interacting with a soft structure. Furthermore, the generated sound from fluid flow and structural mechanics is also taken into account. To get a correct model for the acoustic source terms resulting from the fluid flow Lighthill's analogy is applied, while(More)
The basis of the human phonation process is given by complex interaction of air flow in the larynx together with structural mechanics of the vocal folds. This paper presents a numerical scheme to model the fluid-solid interaction in the human larynx and its resulting acoustic sound. The scheme is utilised to simulated the phonation process in a 2D-model.(More)
  • 1